Device with fixed supports for transfer jobs at stepwise forming press
FIELD: process engineering.
SUBSTANCE: invention relates to transfer jobs made at replacement of male dies and processing inserts at stepwise forming presses. Rectangular bed of rolled sheet that can be lifted, downed and displaced at transfer jobs under forming blade with male die is provided with fasteners for setting of processing inserts and two parallel fixed supports for male dies setting.
EFFECT: enhanced performances.
6 dwg, 2 tbl
The invention relates to pipe production, namely the production of pipes of large diameter submerged arc welding of sheet strip material, a molding which is produced on presses-step forming, containing molding knife with punches and a lower beam with process plates, in particular to a device for carrying out handling operations on replacement of punches and technological plates on the presses-step forming.
A press forming step (Fig. 1) consists of the following main parts: upper (1) and lower (2) frame, infeed roller conveyor (3), the transverse conveyor (4), manipulators (5), the movable bending cross member (6) fixed thereto upper molding tool (driven working rolls of the press (7), fixed on top frame) and lower beam (8) located on her lower molding tool.
The top and bottom of the frame are the main bearing structures of the press, which are all the Executive components and assemblies.
Infeed roller conveyor is used to enter the sheet in the press area and has the capability of raising and lowering for stacking the sheet on a transverse roller table.
The transverse conveyor is used for the transverse moving of sheet moulding under the knife.
Manipulators are located on the left and right sides of the press in the quantity of 4 pieces for each �W sides. Are driven from the gearbox via a chain transmission. Manipulators are used to move the sheet moulding under the knife, as well as to move the device during handling operations.
On a movable traverse bending fixed upper molding tool (Fig. 2), consisting of the following main parts: moulding knife (1) mounted on the molding knife mounting of the punches (2), and punches (3). Punches are attached to the fixtures for the installation of punches special mounting mechanisms (4), by means of bolting. Punches, depending on the size of produced pipe billets, there are different radius. So, for each diameter of pipe billets used punch with the required radius of the working surface.
The lower beam is fixed the lower molding tool (Fig. 2), consisting of a set of identical dies (5) and the set of processing plates (6), which regulate the distance between the dies. Each diameter of pipe billets produced corresponds to a specific value of the distance between the dies. During the handling operations on the lower beam only technological change plates, increasing or decreasing the distance between the dies. Choose strikers do not change. In holes of the lower b�LCI are lifting draw-out rollers (7), which serve for the transportation of finished tubular workpieces from the press on the outlet table.
Thus, when switching to production of other sizes of pipe billets, required throughput, which includes the replacement of punches and technological plates.
A device for carrying out handling operations on replacement of punches to short stroke the press-step forming of pipes up to 18 m, which includes structure in the form of baths, made by way of welding, equipment for laying and fixing of punches along the longitudinal axis (Fig. 3) (Passport Device replacement tool o-forming press (18 m) Position 3.1.11 Serial number 5002021-06.400).
Figure 3 shows the current device (1) for the staging of works on replacement of punches on front loading stepwise molding press for pipe length of 18 m ("Caravel"). At the beginning of throughput Caravel with the help of overhead crane is placed before moulding knife outlet roller table for rolling of pipe blanks press-step forming. Using roll-out carts Caravel rolled under the moulding knife raised by the pull-out rollers, which carry the output of the finished tubular workpieces from the press, and is set so that the last 8 punches (2) are nadnej. Further forming the knife is lowered into the Caravel, pressing punches seats to caravels. Loosened the bolts of the fastening mechanisms of punches, and then molding the knife is raised and the punches remain in the squadron. Further Caravel rolls out from under the moulding knife and an overhead crane is transported for replacement of punches in the storage location. Then an overhead crane placed second blank Caravel on the output conveyor of the press and in the same way, remove the remaining seven punches. After the operation, in two caravels starts relaying of punches. Shot punches a tap placed in special racks for storage, and then in an empty Caravel stack other punches. After that caravels ready to install the new punches on the moulding knife. Installation of punches happens on the same principle. Caravel with the necessary punches laid on the output conveyor, rolled under the moulding knife moulding knife is pressed against the surface of punches, tighten bolts of fastening mechanisms of punches, moulding knife rises, empty Caravel rolls out from under the moulding knife and transported by crane to a storage location. The same operation is performed with the second Caravel.
The disadvantage of this device is the lack of attachment to the criminal code�ADCI technological plates which leads to the use of another device to replace the technological plates (Fig. 4) (Passport replacement straps o-forming press (18 m) Position 3.1.11 Serial number 5002021-06.501). Another disadvantage of the caravels is the length of this device up to 10 m, which allows you to take all the punches with short stroke press-step forming for pipe length of 18 m, resulting in a staging works to use two identical caravels with their alternate transportation in the zone of the press and out of it, and this leads to additional time spent in transit. The design of this device, due to the high sides, does not provide free access to the fastenings of punches that also leads to additional delays in transhipment operations, and consequently, to a significant increase in their duration.
Figure 4 shows a device for carrying out handling operations on replacing the plates on the press-step forming for pipe length of 18 m. This device is normally used after removal of punches. On a rectangular base (1) mounted attachment for laying the technological plates (2) where fit technological plate (3). It is a device using the overhead crane is placed on the input conveyor of the press forming step for�ACI slab (strip) in the space of the press. The device is rolled into the working space of the press and stops in front of the first two sets of process plates (closest to the forming press operator), then the device with the help of manipulators is shifted to the lower beam of the press. Then using the manual chain hoists are replacing the first two sets of process plates on the right side of the lower beam. Further, the device with the help of manipulators is shifted to the left side of the lower beams and there is a technological replacement plates. Then you need to change the remaining two sets of process plates (farthest from operator), but the length of this device is allows you to immediately begin these operations. To do this, first we need to bring this device to the inlet table press, move along the bottom of the beam to the remaining sets and then also replace the technological plate.
The closest technical solution (prototype) is a device for staging of works on replacement of punches on long stroke stepwise molding press for pipe length of 12 m (Fig. 5) (Passport Device replacement tool o-forming press (12 m) Position 3.1.10 Serial number 5002018-06.400), consisting of a rectangular base height 1: 50 mm, frame which made by way of welding of I-beams. On PR�moguldom under mounted one line lifting cradle for laying and fixing of punches on the longitudinal axis of the device the total height of which in the collection equal to 500 mm.
Figure 5 shows the current device for carrying out handling operations on replacement of punches on long stroke stepwise molding press for pipe length of 12 m. This device is placed directly overhead crane in the working space of the press, between the moulding with a knife and right manipulators. Further, this device is shifted with the aid of manipulators under forming the blade so that the lifting frame (2) mounted on a rectangular base (1), is installed directly under the fixed on the molding knife punches (3). Then using lift draw-out rollers, passing through holes in the rectangular base, rises the lifting cradle, holding the seat to the punches. Then loosened the bolts fastening mechanisms, moulding knife rises, lifting the cradle is lowered to the base of the device, and with the help of manipulators, the device displays under the knife and moulding is installed between the knife and right manipulators. Further overhead crane device is transported to a storage location for shifting of punches. Unloaded shot punches and downloading the necessary pavement specks transports the device again in the working space of the press. Set the punches the same way.
The disadvantages of manageritalia, as the above analogue, are the lack of attachment to the styling of technological plates, which leads to the impossibility of using it to replace technological plates. The presence of one line of the cradle increases the duration of throughput, because throughput, this device should be taken from a zone press to remove from the cradle taken punches to lay the punches of the required size, post again to transport the device to a zone press to continue - complete handling operations. This operation greatly increases the time of the handling operations. One of the disadvantages of this device are the overall dimensions, excluding the possibility of its use for carrying out handling operations on short stroke stepwise molding press for pipe length of 18 m.
The objective of the proposed device is to increase the productivity tube mill "Height 239" in the production of pipes of large diameter submerged arc welding, by reducing time in transit work, most of which is consumed for transportation of the necessary devices to a molding press and back, on movement of the device during the handling operations directly in the working space of the press, shifting �of Antonov in devices for replacement of punches. Existing devices for replacement of punches, due to its design, does not allow you to change punches for the entire length of the moulding knife and do not allow moving directly under the moulding with a knife. The task is to solve the drawbacks of the existing devices is the design of the device allows to change and punches, and technological plate, with the ability to move this unit directly under the moulding with a knife, and having two of lodgement under punches that will avoid the operation of passing of punches directly to the device.
The technical result is achieved in that the proposed device for carrying out handling operations on replacement of punches and technological plates for press forming step containing molding knife with punches and a lower beam with technological plates used in the production of pipes of large diameter submerged arc welding, includes a rectangular base made of sheet metal, is capable of lifting, lowering and movement during handling operations under the moulding with a knife with the punches, and has mounted on it fixing for laying the technological plates and two parallel to and fixedly spaced cradle for laying punches.
Comparable�individual analysis of the prototype showed the proposed device for carrying out handling operations on replacement of punches and technological plates for press forming step (Fig. 6) containing molding knife with punches and a lower beam with technological plates used in the production of pipes of large diameter submerged arc welding, characterized in that the rectangular base is made of sheet metal, is arranged to move during reload operations under the moulding with a knife with the punches and has mounted on it fixing for laying the technological plates and is capable of raising and lowering the two parallel lodgement for laying punches. Thus, these differences allow to draw a conclusion about the compliance with the criterion of "inventive step".
Comparison of the proposed device is not only prototype, but also with other technical solutions in this field of technology is not allowed to reveal in them the features distinguishing the claimed device from the prototype that corresponds to the patentability of "inventive step".
Figure 6 shows the proposed device for carrying out handling operations on replacement of punches and technological plates on front loading stepwise molding press for pipe length of 18 m. On a rectangular base (1) is done� of sheet metal, mounted two parallel and fixedly spaced cradle (2) for laying punches (3) and mounted mounting (4) for laying the technological plates (5). Before beginning handling operations in one of a stationary cradle of the device stack of the necessary punches. When the press forming step is finished and start a staging of the work, the proposed device is transported by the input conveyor to the working space of the press and moves the manipulators moulding under the knife so that the empty cradle was established under the moulding with a knife. The knife is lowered by a certain value, and then using lift drawout roller abuts against the lower surface of the base, the device with a slight skew (part of the device, which affected the roll-out rollers, rises and continues to lie) rises and presses the seat of lodgment to the punches mounted on the molding knife. Misalignment of the device in this case does not affect the carrying out of handling operations. End the screws fastening mechanisms, lowered draw-out rollers, which, in turn, lowers the device to the lower beam shot with the punches remain in the cradle. Further, the device is moved in any direction for change of manufacturing of the plates. Breadboard�e plates are shown along the entire length of the lower beam with one side. After that, the device shifts to the other side for a change of manufacturing plates on the other side of the lower beam. The device then move to lodgement with the necessary punches to install moulding under the knife. The device rises again, pressing punches to the molding knife, tighten bolts of fastening mechanisms, the device is lowered to lower the beam, after which the entire device is not expected, light manipulators from under the moulding knife and on the input conveyor is eliminated from the working area of the press.
The invention is carried out in the shop "Height 239" JSC "Chelyabinsk tube rolling plant" in the production of pipes by the method of submerged arc welding, molding which is produced on presses-step forming, containing molding knife with punches and a lower beam with technological plates.
During the handling operations on short stroke stepwise molding press with two caravels and a device for the change of manufacturing plates, a significant portion of time is spent on transport work to move all of the aforementioned devices to a zone press and from it (table 1). For example, each squadron transported 4 times. First - empty Caravel is transported to the press, then, when it was taken down punches, the Caravel is transported to the storage area for shifting of punches, then� this Caravel again transported to the press for the installation of punches on the moulding knife and only after that an empty Caravel is transported to the storage area. In addition, in the hall of throughput, there is a long-term replacement surgery of punches directly to the caravels. The length of the device on replacing plates is not possible to immediately change all process plates at one side of the lower beam, which leads to additional time for moving the device along the bottom of the beam.
The use of the proposed device for carrying out handling operations on short stroke stepwise molding press for pipe length of 18 m will significantly reduce the time of handling operations by reducing transport operations (table 2). The device is transported to a zone press in the beginning of throughput, and output from the zone press only on completion of all works. During the works there are moving the device just under the moulding with a knife with the help of manipulators. Also in this case, the operation is completely eliminated by the replacement of punches in the caravels. The design of the proposed device, unlike the Caravel, due to the low sides of the cradle provides easy access to the bolt connections of the fastening mechanisms of punches that, in turn, reduces the complexity of the work. Large surface area of the proposed device allows you to move freely on the device, Thu� increases the safety of the operations.
In total, the transit time will be reduced from 420 minutes to 210 minutes, by reducing the total time for transportation from 195 minutes to 45 minutes and the exclusion of the operation of passing of punches in the caravels - 60 minutes.
The device for carrying out handling operations on replacement of punches and technological plates for press forming step containing molding knife with punches and a lower beam with technological plates used in the production of pipes of large diameter submerged arc welding, comprising a rectangular base made of sheet metal, is capable of lifting, lowering and movement during handling operations under the moulding with a knife with the punches and having mounted on it fixing for laying the technological plates and two parallel to and fixedly spaced cradle for laying punches.
FIELD: machine building.
SUBSTANCE: press consists of servo-motor, of slider, of holder for securing upper part of punch to slider, of mechanism for power transfer and of block of control of at least servo-motor and holder. The control block facilitates transfer of the slider into a position, when an upper part of the punch sits on the lower part of the punch, the upper part of the punch disconnects from the slider and the slider travels upward into standard position. Also, the slider does not reach an upper dead point. Further, upper and lower parts of the punch are extracted from the press and parts of another punch are installed. The slider is lowered into a position, when the upper part of another punch is attached to it; the said upper part is fastened and the slider is hoisted into the position when punching commences.
EFFECT: reduced time for punch replacement.
8 cl, 8 dwg
SUBSTANCE: holding device includes, as a minimum, several pulling clips, each of which contains, as a minimum, one pulling frame with a closed circuit and two segments separated and located oppositely to each other; between the segments, forming device is located. Each of the segments has supporting surfaces. Each of the pulling clips is designed with the possibility to rotate at one hinge, as a minimum. Also, there is a supporting surface located above the forming device or on its surface, and serving as a support for the supporting surface of the pulling clip, and a device for providing a certain holding force designed as several power components. The pulling frame material is a reinforced compound. The device for producing metal parts by hydro-forming includes, as a minimum, closed forming instrument and holding device. The device for holding the tool includes, as a minimum, pulling clip with at least one closed circuit pulling frame with two segments separated and located oppositely, to each other, between which the forming tool is located. Each segment has supporting surfaces. The device also has supporting surfaces and designed based on the condition of providing certain holding forces between the supporting elements of the pulling clip and a surface located higher or lower of the tool. The line of application of the composite force resulting from the holding forces is located parallel and in a plane, which does not diverge essentially from the plane dividing the pulling clip into two halves in the axial direction. The material for the pulling frame is a reinforced alloy.
EFFECT: increase in performance and quality of manufactured products.
12 cl, 6 dwg
SUBSTANCE: device contains frame, two flanges with windows and cylindrical holes to install driven and non-driven horizontal shafts with rollers, cushions, roll bearings and non-driven vertical assemblies of rollers and device for rollers changing. In the frame from the drive side of the horizontal shafts a longitudinal groove is made to secure one flange, the second flange is secured in the longitudinal grooves of the provided at least two carrying beams having possibility of movement at right angle to the longitudinal grooves using the device for rollers changing in the sliding guides made in the frame. The roll bearings of the horizontal shafts located in the second flange are installed on the spacing bushings with internal cone holes interacting with the made cone ends of the horizontal shafts and are secured by means of wedges. The device for rollers changing is made in form of the driven shaft located on the frame with bearing supports and rack-and-pinion gears, which gear wheels are installed on the driven shaft, and racks are installed in the bearing beams.
EFFECT: rigidity increasing of the device and quality improvement of items.
2 cl, 6 dwg
SUBSTANCE: shaping of a band in rolls with open passes is performed till a bending angle of 180°, moulding of a tube workpiece in a drawing die - by folding the band edges into a tube workpiece till the scheduled angle; moulding is performed in the rolls with cold passes with a split washer; final moulding in the rolls with closed passes without any split washer with the same diameter for its calibration into the tube prior to welding. The mill includes a frame, a housing with vertical rolls, lower and upper moulding drive rolls with open passes and closed passes with a split washer, edger rolls alternating with them, the drawing die, a drive and a welding device. The drawing die is fixed with hold-down planks in the housing mounted on the frame after the last rolls with open passes and made in the form of a sleeve with a pass with a conical surface, which is located inside it, with a diameter reducing from the inlet side to the outlet side. The pass is located so that a cross section in the form of an ellipse is formed in a plane perpendicular to the frame axis. After the rolls with closed passes with the split washer there installed are rolls for calibration of the tube workpiece into a tube before the welding device.
EFFECT: excluding twisting of workpiece edges.
2 cl, 8 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to pipe rolling. This process comprises crosswise welding of pipe billets. Assembly-line production of these pipes comprises coiling sheet or roll strips on spinning reel their length being specified by mathematical relationship. Then, strip edges are welded together in radius from pipe billet outer surface to its inner surface. Then, after removal of coiled pipe billet from said reel, strip outer and inner edges are welded to pipe billet. Proposed plant comprises reel, reel drive, gear stand, stationary case, pipe billet removal lever displacing in horizontal plane, lever drive with worm reduction gear, cover with thrust bearing, unit for radial and lengthwise welding of pipe biller plies, feed roll table with straightening- tensioning device, prism for fitting strip rolls, draw-off roll table and crosswise butt welding means. Note here that said reel has driven and idle journals. The former is engaged via reduction gear with the drive while the latter is engaged with the cover. The latter is coupled with stationary case accommodating the thrust bearing. Groove is made in outer diameter of said reel.
EFFECT: lower costs and metal input.
FIELD: process engineering.
SUBSTANCE: device is intended for continuous forming square cross-section pipes (32). This machine comprises workstation (33) for gradual bending of sheet strip (34), at least one finishing station (35) for converging of edges (36) and at least one workstation for closing of pipe (32). Shafts of lower rollers (2, 4, 6, 8, 10) of every pair of forming rollers (1, 2; 3, 4; 5, 6; 7, 8; 9, 10) at workstation (33) are horizontal and aligned. Every finishing workstation (35) comprises idle forming roller (12, 16, 20) arranged above pipe (32), two idle forming rollers (11, 15, 19) arranged on sides of pipe (32) to displace in opposition parallel with the plane of sheet strip (34) and two idle forming rollers (13, 14; 17, 18; 21, 22) located above pipe (32) displacing perpendicular to said plane of sheep strip (34). Shafts of forming rollers (12, 16, 20) located above pipe (32) are parallel with the plane of sheet strip (34) and with shafts of forming rollers (13, 14; 17, 18; 21, 22) located above the pipe. Shafts of forming rollers (11, 15, 19) located on sides of pipe (32) are parallel and perpendicular to sheet strip (34) plane.
EFFECT: higher efficiency.
11 cl, 6 dwg
FIELD: process engineering.
SUBSTANCE: proposed device comprises strip blank edge trimmer (1), roll-type forming machine (2) and forming machine composed of plate-frame (3). Strip edge trimmer (1) comprises machine bed (1.1), broaching-centralising device (1.2) and multiple mechanisms (1.3) for edge trimming. Said roll-type forming machine (2) represents an open type machine combined with the help of external roll device (2.1) and internal roll (2.4). Said forming machine composed of plate-frame (3) comprises machine frame body (3.2), top horizontal roll mechanism (3.4), top horizontal roll adjustment mechanism (3.5), friction bearing (3.10), support plate (3.11), hydraulic cylinder (3.12), bottom horizontal roll mechanism (3.6), bottom horizontal roll adjustment mechanism (3.7), lateral vertical roll mechanism (3.8) and lateral vertical roll adjustment mechanism (3.9).
EFFECT: compact design, higher efficiency.
8 cl, 7 dwg
SUBSTANCE: steel sheet parent metal comprises the following components, in wt %: 0.010-0.080%, Si: 0.01-0.50%, Mn: 0.50-2.00%, S: 0.0001-0.0050%, Ti: 0.003-0.030%, Mo: 0.05-1.00%, B: 0.0003-0.0100%, O: 0.0001-0.0080%, N: 0.006-0.,0118%, P: at least 0,050% or smaller, Al: at least 0.008% or smaller, Fe and unavoidable impurities making the rest. Carbon equivalent (Ceq) makes 0.30 to 0.53, crack growth resistance in welding (Pcm) makes 0.10 to 0.20, while [N]-[Ti]/3.4 does not exceed 0.003. Mean size of primary γ-grains in thermal effects zone in steel sheet makes 250 mcm or smaller, while primary γ-grains include bainite and intragranular bainite.
EFFECT: sufficient low-temperature toughness.
9 cl, 3 dwg, 2 tbl, 1 ex
FIELD: process engineering.
SUBSTANCE: invention aims at enhancing the quality of small- and medium-diameter longitudinal welded tubes. Proposed mill comprises frame to accommodate stand with vertical rolls, drive forming rolls with open and closed passes and edger rolls alternating therewith, welding device and biller edge position transducer. Pressure at welding rolls at butt welding of edges and heating losses thereat are reduced by arranging edge centering mechanism and tube billet reduction and sizing rolls behind the last closed pass, said rolls having rolling diameter and profile. Bed is mounted on said frame to integrate forming rolls with open and closed passes, mill edger rolls and edge centering mechanism. Crossbar arranged at the bed is fitted with disc blade and support roll. Said disc blade and support roll have vertical adjustment mechanism while disc blade has additional horizontal adjustment plane. Mechanism centering edges is composed by roll with disc-like wedge ledge at the center to be adjusted in vertical plane and through angle of turn in both sides relative to mill axis. Edger rolls are secured at rails arranged at bed top section.
EFFECT: perfected design.
2 cl, 8 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to tube rolling and may be used in production of wrought tubes. In carbon-arc gouging, sheet lengthwise edges are cut at oblique angle or at double angle to sheet plane, sheet edges tucking in, pre- and final forming. After final forming, billet is produced with its lengthwise edges overlapped without alignment. Then, billet lengthwise edges are aligned by application of expansion force inside the billet to cause prestressed state and to weld lengthwise seam.
EFFECT: higher reliability.
3 cl, 5 dwg
SUBSTANCE: part of basic material contains the following, wt %: C more than 0.03-0.08, Si 0.01-0.5, Mn 1.5-3.0, P ≤ 0.015, S ≤ 0.005, Al 0.01-0.08, Nb 0.005-0.025, Ti 0.005-0.025, N 0.001-0.010, 0 ≤ 0.005, B 0.0003-0.0020, in addition: includes one or more of the elements: Cu, Ni, Cr, Mo and V, the rest is Fe and inevitable impurities. Tensile strength is 760-930 MPa, relative elongation is 5% or more and ratio of yield strength to tensile strength is 85% or less. Part of weld metal contains the following, wt %: C more than 0.03-0.08, Si < 0.5, Mn 1.5-3.0, P ≤ 0.015, S ≤ 0.005, Al ≤ 0.05, Nb 0.005-0.05, Ti 0.005-0.03, N ≤ 0.010, 0 0.015-0.045, B 0.0003-0.0020, in addition it includes one or more of the elements: Cu, Ni, Cr, Mo and V, the rest is Fe and inevitable impurities. In microstructure of heat-affected zone upon welding size of primary austenitic grain is 50 mcm or more, and structure consists of lower bainite or multiphase structure containing lower bainite with fraction part of 50% or more and upper bainite and/or martensite.
EFFECT: improving pipe strength upon buckle and impact strength of heat-affected zone upon welding.
19 cl, 1 dwg, 8 tbl, 2 ex
FIELD: process engineering.
SUBSTANCE: invention relates to forming and welding of lengthwise seams in thin-wall small-diameter pipes made, primarily, of stainless steels. Device foundation 1 accommodates last stand of forming mill with bottom forming roll and top seam guide roll, mechanism of radial and axial adjustment of rolls, means 3 to act at tube billet lengthwise edges, welding assembly 4 and seam squeezing stand 5. Said means 3 to act at tube billet lengthwise edges is composed of to seam guide roll 8 fitted lateral cylindrical journals to run in plain bearings and to turn from hydraulic cylinder around roll pins. Housing accommodates seam guide rolls. At housing top section welding assembly 4 equipped with lengthwise adjustment mechanism with retainer is mounted. Housing top section has horizontal opening accommodating said lengthwise adjustment mechanism with retainer.
EFFECT: higher quality of tube welding by arc and laser processes, smaller sizes and metal input, higher reliability.
FIELD: welded tube production, namely welding stands for assembling and welding straight-seam tubes of finite length.
SUBSTANCE: welding stand includes welding apparatus, upper pressure roller and holder in bases of which upper and lateral roller cassettes having mechanisms for adjusting their motion are mounted in casings. Mechanism for adjusting motion includes kinematic pair screw-nut, driven gearing, housing, bracket, pin, rectangular axle, screw having cross groove in head, tie rods nut with left and right threads. Head of screw of kinematic pair is coupled through pin with slide block mounted in base of holder. Driven gear wheel of gearing is rigidly engaged with nut of kinematic pair and it is arranged in case mounted on bracket. Bracket is provided with opening for screw of kinematic pair. Casing of roller cassette is jointly mounted on bracket by means of pin. Bracket is coupled with slide block rigidly secured to holder with possibility of motion. Slide block is joined with head of screw by means of rectangular axle arranged in cross groove of screw head. Tie rod for rotating casing of roller cassette relative to bracket is jointly mounted on end of casing of roller cassette. Said tie rod is coupled with tie rod jointly mounted in bracket by means of nut with left and right threads. Mechanism for adjusting motion of upper roller cassettes is arranged in parallel to vertical axis of holder. Mechanism for adjusting motion of lateral roller cassettes is arranged along radius of base of holder.
EFFECT: improved efficiency of stand, enhanced quality of welded tubes and accessibility for repair.
2 cl, 6 dwg
FIELD: tube production, possibly manufacture of thin-wall and super-thin wall tubes of refractory dispersion hardened nickel-base alloys.
SUBSTANCE: method comprises steps of continuously feeding formed tube blank and welding its edges in chamber filled with inert gas and simultaneously supplying inert gas into jet of torch and inside welded tube; after welding providing accelerated cooling of tube until 200-300°C in inert gas atmosphere.
EFFECT: enhanced mechanical strength of tubes due to improved quality of welded seam.
FIELD: metallurgy, namely processes for making tubes, for example metal-polymer tubes by ultrasonic welding.
SUBSTANCE: method comprises steps of forming continuous metal strip to U-shaped profile blank; twisting U-shaped profile blank to tubular one with overlapping edges at moving tubular blank along its lengthwise axis; welding overlapped edges of tubular blank by means of roller rotating in motion direction of tubular blank and subjected to ultrasonic oscillations along its rotation axis; extruding polymeric material onto surface of welded tube. Welding is realized at roller rotation speed Vr exceeding speed Vt of tubular blank motion. Value Vr is selected in range Vr = (1.1 - 1.4)Vt. Pressing effort Fpr of roller to tubular blank is selected in range 4 - 8 kg.
EFFECT: enhanced quality and operational characteristics of metal-polymer tubes.
4 dwg, 9 ex
FIELD: metallurgy, namely tube manufacture by ultrasonic welding, for example making metal-polymer tubes.
SUBSTANCE: method comprises steps of forming continuous metal strip to U-shaped profile blank; twisting U-shaped profile blank to tubular one with overlapping edges at moving tubular blank along its lengthwise axis; welding overlapped edges of tubular blank by means of roller rotating in direction of tubular blank motion and subjected to ultrasonic oscillations along its rotation axis; extruding polymeric material onto surface of welded tube. Welding is realized at motion speed Vt of tubular blank exceeding speed Vr of roller rotation. Value Vt is selected in range Vt =(1.05 - 2.0)Vr; pressing effort Fpr of roller to tubular blank is provided in range 3 - 6 kg.
EFFECT: enhanced quality and operational characteristics of metal-polymer tubes.
4 dwg, 9 ex
FIELD: machine engineering, possibly manufacture of shells of rollers and belt conveyers.
SUBSTANCE: method comprises step of twisting strip having V-shaped edges to tube, squeezing it and welding tube edges with us of friction heat of metallic disc rotated and moved along butt of shell edges. Disc has concave surface in zone of its contact with shell for providing close adjoining of disc and shell.
EFFECT: prevention of burr creation.
FIELD: heating engineering, particularly tubular air heater production.
SUBSTANCE: method involves bending metal strip to form tube and performing longitudinal welding thereof. Before strip folding identical depressions with predetermined geometrical parameters are formed on strip surface corresponding to inner tube surface. The strip edges adapted for following welding are free of above depressions. The depressions are formed by cold stamping along the full tube length.
EFFECT: increased manufacturability, possibility to produce tube of small diameter.
FIELD: heat treatment of welded large-size articles such as connecting parts of pipelines or thick-wall large-diameter tubes of low carbon complex-alloy steel.
SUBSTANCE: tubular article is welded of shaped sheet blanks. Before hot shaping sheet blank is heated up to temperature Ac3 +(80 - 190)°C. Ready welded article is finally bulk heated up to Ac3 +(50 -100)°C , then it is cooled and subjected to tempering. Before final bulk heating of ready article it is preliminarily bulk heated up to temperature Ac3 +(80 - 190)°C. After preliminary heating article is cooled in air or it is subjected to accelerated cooling till metal temperature M - 600°C for further cooling in air. After preliminary bulk heating and(or) preliminary final bulk heating cooling may be performed by three stages. At first stage cooling is realized at rate providing crossing of cooling curve with line of starting structural conversion of austenite to ferrite in thermal kinetic diagram. At second stage cooling is realized at less rate or isothermal soaking is performed in temperature range Mn -550°C till complete austenite decomposition according to said diagram. At third stage cooling is realized at rate preventing separation of interstitial atoms from supersaturated solid solution till temperature no less than 180°C. Then during preliminary bulk heating article is loaded in furnace for final bulk heating. If only final bulk heating is realized, article cooling is going on at rate no more than 3°C/s. Before preliminary or final bulk heating, additional local heating up to temperature Ac3 +(80 -190)°C may be realized. Accelerated cooling of welded seam metal and adjacent zone whose width does not exceed five thickness values of article wall at each side from center of welded seam till temperature of metal no less than 450°C at rate providing ferrite-bainite or bainite metal structure also may be realized.
EFFECT: optimized parameters of heat treatment of tubular articles.
5 cl, 1 tbl