Mill for cross-wedge rolling
(57) Abstract:Usage: the invention relates to the processing of metals by pressure. The inventive mill for cross-wedge rolling includes rolling stand 2 in the form of spatial, i.e. on opposite sides of which respectively on the upper package 3 and the lower package 4 rolling stands 2 in the guide 5 and the slider 6 is fixed respectively to the upper tooling plate 7 and the lower tooling plate 8. Top plate kinematically connected with the rolling elements 9 by means of two shoulders of the levers 10. Fulcrum two shoulders arms kinematically interconnected by Naregatsi 15. 3 C.p. f-crystals, 1 tab., 4 Il. The invention relates to metal forming, and more particularly to mills for cross-wedge rolling.A known design of mills for cross-wedge rolling flat tool are divided into two groups: the mills with two movable tools  and mills with one movable tool. The design of the mill includes a housing defined by the plates, one of which can be fixed. The mills are equipped with cumbersome and complex systems wedging and adjust ZAR CLASS="ptx2">Known Stan for cross-wedge rolling with one movable tool . Known Stan for cross-wedge rolling contains installed on the frame of the rolling mill, located in the mill tooling plate, at least one of which is moveable and is connected with the drive of the reciprocating movement. In the camp there is a unit to adjust the gap between instrumental plates. The rolling mill is a team structure assembled from cast housing and cover. The body is made of transverse grooves, and the cover is transverse ribs, which are slots on the chassis, so you can collect them with axes. On the axes in the region of the projections of the cover are the flats that allows for the rotation axis 180oto release the cover, which raises the value of the flats and performs rasklinivanie. Thus, to spend rasklinivanie, you must rotate the axes are on different sides of the rolling stands, which makes access to them.Rolling crate covers tooling plate across. Therefore, generated in the process of rolling scale and leaf waste fall into the space between the side surfaces of the tool complicates the design of the mill.In addition, the rolling mill is known mill has an internal surface that requires grinding. In this regard, the design of the rolling stands is very difficult to manufacture. Moreover, the dimensional accuracy of the processed product is significantly reduced due to the use of molded construction housing and cover. The fact that this is due to the heterogeneity of casting these parts, reducing the rigidity of the rolling stands.Known and closest to the technical nature of the design of a mill for cross-wedge rolling includes rolling mill in the form of bulk, i.e. on one of the pairs of opposite sides which are located on the rolling bodies tooling plate, and the said sides are connected through the horizontal axis of the pairs of vertical levers and rolling mill equipped with an eccentric hub adjustment of the working gap of the mill .The implementation of the prototype  in the form of spatial, i.e. improves its workability, reduces the anisotropy of strength properties of the structure as a whole. Compared with cast designs he has high rigidity.But a disadvantage of the known mill is what the deposits have a significant amount of planting gaps, total error which reduces the rigidity of the structure as a whole and thereby reduces the dimensional accuracy of the resulting rolled product.The basis of the invention is to improve the dimensional accuracy of the products obtained by increasing the rigidity of the mill.The problem is solved in that in the camp for cross-wedge rolling includes rolling mill in the form of spatial, i.e. two opposite sides of which are posted on the rolling bodies tooling plate, the sides are connected through the horizontal axis of the pairs of vertical levers and Cam site adjustment of the working gap of the mill, according to the invention, the tool plate connected kinematically with the rolling bodies two shoulders of levers, fulcrums which are connected by Naregatsi. The execution of such structural kinematics: instrumental plates - two shoulders levers - narwhale - body roll - guides - allows total deviation of landing clearances almost lead to a backlash-free, which increases the rigidity of the mill.It is advisable to opposite sides of Prostranstvennaya.Also used the design of the mill, where nagruzhatel made in the form of two telescopically interconnected rods, between which is placed a compression spring.Execution of nagruzhatelya thus makes it adaptable to production and adjustments, and provides automatic selection of landing clearances.Use the construction of the mill, where the horizontal axis of the vertical levers rigidly attached to opposite sides of the spatial, i.e.. This embodiment eliminates the landing clearances link: horizontal axis - opposite side, i.e. and contributes to increasing the rigidity of the mill.Use the construction of the mill in which eccentrics site adjustment of the working gap mounted inside two opposite sides, which are instrumental plates. Accommodation eccentrics inside the bodies of opposite sides, i.e. aimed at increasing the rigidity of the mill.In Fig.1 shows a schematic diagram of the camp that instrumental stove (top, may be lower) kinematically connected with the rolling elements by means of two shoulders levers, side view; Fig.2 - procatalyse posted by compression springs and attached to the points of supports two shoulders of the levers, side view of Fig.3 is a schematic diagram of the mill, in which eccentrics site adjustment of the working gap of the mill mounted inside two opposite sides, which are instrumental plates, section A-A in Fig. 1; Fig.4 is a schematic diagram of the mill, in which the rolling mill is made in the form of spatial, i.e., kinematic diagram of the General form.The proposed mill for cross-wedge rolling (Fig.1) comprises a frame 1, set it rolling stand 2 having the form of a spatial, i.e. on opposite sides of which respectively on the upper package 3 and the lower package 4 rolling stands 2 in the guide 5 and the slider 6 is fixed respectively to the upper tooling plate 7 and the lower tooling plate 8, the upper tooling plate 7 (may be lower tooling plate 8, depending on the size of the workpieces and technology) kinematically connected with the rolling elements 9 (Fig.2) resting on the guides 5, by means of two shoulders of the levers 10 one of the shoulders 11 which are directly connected with the rolling elements 9, and others shoulders 12 are attached to a strap 13 of the slide 6, which is fixed to the upper tooling plate 7; x telescopically assembled between the rods 16, 17, between which is placed a compression spring 18; on the slider 6 are installed in the horizontal support rollers 19 to reduce friction of the slide 6 and the side surfaces of the guides 5. The upper package 3 and the lower package 4 rolling stands 2 are connected by three pairs of vertical levers 20, through which are passed the horizontal axis 21, rigidly attached to the packages (opposite parties 3 and 4 (Fig.3).Eccentrics 22 (Fig.4) site adjustment of the working gap of the mill (or closed height) mounted inside the body of the lower package 4 (possibly the design of the installation of the eccentrics 22 and inside the body of the upper package 3), while the trunnion 23 eccentrics 22 passed through the vertical levers 20 and on the middle part of the cervical eccentrics planted worm wheel 24 driven in rotation by the worm 25 node 26 adjustment of the working gap of the mill.In Fig. 4 schematically shows a General view of the camp, where the rolling stand 2 has the form of spatial, i.e.. The mill of Fig.4 works in the same way as in Fig.1.Before working mill producing sample landing clearances (Fig.4) in the kinematic links:
(a) a slider body rolling - guides - two shoulders levers - nirelease side of i.e. rolling stands 2 - narwhale - horizontal axis - vertical levers; by influencing distance of the effort from nagrujala on the upper and lower packages.C) narwhale - packages - eccentric in the body of the packet Cam site.In the process of regulation of the working gap (closed height) by means of the eccentric mechanism produce force closure of the kinematic link: nagruzhatel - eccentric - package - vertical levers. In this configuration choose the backlash (boarding gaps) in the kinematic chain. When idle spacer rolling forces play-free kinematics increases the rigidity of the mill.When the mill spacer rolling forces act through the workpiece on the tool plate, slide, two shoulders levers, packages, axis, vertical levers, Cam site, narwhale. Due to the fact that the vector distance of the rolling forces coincides with the vector of the spacer efforts of nagrujala, the total value of planting gap tends to zero, i.e., the rigidity of the mill as a whole exceeds that of known construction and, thus, increases the dimensional accuracy of the products, which confirms the practice.Mill for cross-wedge rolling 29, then drive the reciprocating movement of the report translational motion by means of the cylinder 30 to the slider 6.The initial position of the slide 6 shown in Fig.1. The slider 6 is moved along the upper package 3 plates, and the tool 28 closer to the workpiece 27 and implement it. Due to friction forces arising between the tools 28 and 29 and the workpiece 27, the latter is put into rotation, during which its deformation. Deformation of the workpiece 27 is carried out on the land movement of the upper tool 28 until it completely passes over the lower tool 29. This grip tools 28 and 29 with the workpiece 27 is stopped, and she falls out of the tools 28 and 29, then the slider 6 returns to its original position. If you find that the diametrical dimensions of the plate 27 does not match the given value, the gap between instrumental plates 8 and 7 is changed to the deviation of the actual dimensions of the plate 27 from the set. To do this, turn the Cam 22, which is located in the lever 20 of the lower package 4 plates at a predefined angle, thereby changing the distance between the upper and lower packages 4, 3.At the same time the axes of the eccentrics 23 and is giving what remains parallel between instrumental plates 8 and 7.The operation of the adjustment, repeat as necessary. In case of emergency there is a possibility of jamming of the workpiece 27 between the tool 28 and 29 in the rolling process. To prevent jamming of the workpiece 27 is released, increasing the gap between the tools 28 and 29 by a wide margin. For wedging rotate the Cam 20, located in the lever 20 pack 4 plates 180orelative to the original position. The initial position of the eccentric 22 is selected so that always when the rotation angle between the lever 20 and the package 4 of the plates is increased.Example. Implemented a rolling speed of the shafts of steel HAST-74 with a diameter of 30 mm, the Maximum degree of compression on one of the deformed sections was equal to 1.8. The ratio of length to diameter was 6 - of 9.2.Rolling was carried out on the mill base and the claimed design, while at the claimed mill parts were distributed accordingly to the stated characteristics of the formula. The tolerance on the diameter of the drawing was 0.2 mm, Rolled a batch of parts from 100 pieces and above.The data of comparative tests of rolling in the table.As follows from the presented data is s signs, will increase 1.8-2.6 times. 1. Mill for cross-wedge rolling, containing mounted on the frame of the rolling mill in the form of volume, i.e. the opposite side of which is connected between a pair of levers with axes located in the mill tooling plate, at least one of which is moveable, and the node adjustment of the working gap of the mill with a Cam located inside one of the parties, i.e. and a pair of levers located at opposite ends of the mentioned parties, i.e., characterized in that the movable tooling plate provided with rolling elements, two shoulders arms, kinematically connecting the rolling body with movable tool plate, and Naregatsi, connecting the fulcrum two shoulders arms.2. The mill under item 1, characterized in that the tool plate is provided with an additional Naregatsi kinematically linking the tooling plate.3. The mill according to any one of paragraphs.1 and 2, characterized in that the additional nagruzhatel made in the form of two telescopically interconnected rods, between which is placed a compression spring.4. The mill under item 1, characterized in that the axis
FIELD: rolled tube production, namely processes for making mandrels of pilger mills for rolling of hot rolled tubes with mean and large diameters.
SUBSTANCE: method of making mandrels of pilger mills for rolling of hot rolled tubes with mean and large diameters in range 273-550 mm comprises steps of casting steel ingots; forging cylindrical solid or hollow blanks; subjecting blanks to rough working, to heat treatment and working them for final size; hardening blank surface by means of roller; maintaining mandrels until formation of lattice of thermal erosion cracking. Before heat treatment constant- thickness heat- and wear-resistant layer is welded on outer surface of carbonaceous mandrel blank along 2/3 of its working length of mandrel from its joint part while taking into account allowance for mechanical working. Thickness of said layer is decreased towards end of mandrel by 3-4 times. During process of operation mandrel is reground. Then heat- and wear-resistant constant-thickness layer is welded on outer surface of mandrel along 2/3 of its working length from joint part. Thickness of said layer is decreased towards end of mandrel by 3-4 times. Regrinding and layer surfacing steps are performed multiply. Invention allows to use carbon steel instead of alloyed steel at making mandrels, provides increased by 3.5 - 4 times strength of mandrels.
EFFECT: lowered cost of mandrels and therefore reduced cost of conversion of hot rolled tubes in tube rolling aggregates with pilger mills.
FIELD: manufacture of plungers of long-stroke telescopic hydraulic cylinders in automobile making industry, agricultural machine engineering and road building.
SUBSTANCE: method comprises steps of working inner and outer surfaces of parts, trimming ends and chamfering; working blank of part in rolling mill by plastic deforming simultaneously on inner and outer surfaces by cold rolling for producing mirror surface; then trimming ends of part.
EFFECT: simplified process of making plungers, reduced metal losses, enhanced quality of surface and improved strength characteristics of plungers.
FIELD: metallurgy; pipe rolling.
SUBSTANCE: the invention is pertaining to the field of pipe rolling, in particular, to the methods of production of triblets of pilgrim-step rolling mills and may be used at production of triblets of pilgrim-step rolling mills for rolling of hot-rolled pipes of large and average diameters (273-550 mm). The method provides for casting of steel ingots, production of triblets out of the steel ingot blanks by, a heat treatment of the triblet ingot blanks, their mechanical working to obtain the finishing dimension with subsequent hardening by a roller run, casting of carbon steel ingots, application by surfacing on the ingot blanks of a heat-resistant and abrasive resistant layer and production of triblets out of the steel ingots by the pilgrim-step rolling, and in the process of operation after appearance of a net flame erosion cracks conduct a triblet multiple remachining till removal of the heat-resistant and abrasive resistant layer, application of a new heat-resistant and abrasive resistant layer by surfacing, machining till the finishing dimension and hardening by a roller running and determination of the thickness of the heat-resistant and abrasive resistant layer from the following equation Δ = A*µ* (l÷D/S*K), where: A - is the minimal thickness of the surfacing layer after the final mechanical working of a triblet and equaled to 10 mm; D - the maximal diameter of the pipes rolled on the given triblet, mm; S - the minimal wall thickness of the pipes rolled on the given triblet, mm; µ - a reduction ratio at rolling of ingots into the hollow triblet blanks and K - a coefficient equal to 0.02. The invention ensures production of triblets of pilgrim-step rolling mills for rolling of hot-rolled pipes of large and average diameters, usage as the basis of the triblet ingot blanks produced out of a carbon steel instead of alloyed steel, increased resistibility of triblets and as a result of it a decreased share of cost of the technological tools in the cost of production of pipes.
EFFECT: the invention ensures production of triblets of pilgrim-step rolling mills for rolling of hot-rolled pipes of large and average diameters, usage of carbon steel in production of triblet ingot blanks, increased resistibility of triblets, decreased share of triblets cost in the cost of the pipes production.
2 cl, 1 tbl
FIELD: rotary plastic working of materials, possibly forming beads on tubular blanks.
SUBSTANCE: method comprises steps of imparting rotation to blank; providing tool rotation simultaneously with rotation of blank due to contact friction between tool and blank; performing local deformation of blank by means of deforming tool in the form of roller; placing roller with possibility of rotation and turning relative to blank axis; performing deformation by two stages; at first stage performing rotary upsetting of blank by means of roller by angle 15 - 40° relative to blank axis for forming truncated cone; at second stage deforming truncated cone by positive motion of roller by angle 40 - 75° relative to blank axis.
EFFECT: enhanced mechanical properties of article, lowered cost of working blank for deforming, enlarged manufacturing possibilities of method.
4 dwg, 1 ex, 1 tbl
FIELD: plastic working of metals, possibly low-waste processes for shaping elongated forged pieces, mainly nut wrenches.
SUBSTANCE: method comprises steps of heating initial blank and subjecting it to preliminary profiling during transverse taper rolling by means of flat tool at temperature of semi-hot deforming; performing additional heating of rolled blank till temperature of hot deforming in combination with preliminary profiling; then forming forged piece in closed die set in hot deforming mode. Additional heating of rolled blank may be realized due to changing deformation modes of transverse taper rolling causing heating of blank.
EFFECT: lowered power consumption for heating blank, improved quality of forged pieces.
4 cl, 3 dwg, 1 ex
FIELD: plastic working of metals, possibly manufacture of articles with elongated axis.
SUBSTANCE: method comprises steps of heating initial blank and feeding it to rolling stand; controlling temperature in position of starting deformation; shaping article in predetermined temperature range; then removing article from rolling stand and realizing additional temperature control of blank while deforming blank after removing it from rolling stand; measuring value real temperature range of rolling process; comparing said temperature range with predetermined value; then increasing and(or) decreasing heating temperature of initial blank in limit of predetermined temperature range depending upon change value of temperature range of rolling process. Deformation rate at cross-taper rolling is changed in range 28-150 m/min according to temperature change of rolled blank.
EFFECT: improved quality of rolled products, prevention of possibility of opening cavity in axial zone.
2 cl, 2 dwg
SUBSTANCE: it is implemented shaping of barstock by means of redistribution of metal lengthways the axis of blank by means of movable across axis at least two wedge-like tools. At least to tone wedge-like tool it is applied additional reciprocative transportation on-the-mitre from 0° up to 90° to direction of its main motion with amplitude of oscillation from 0.002d up to 0.02d and frequency more than 10v/(πd), where: d - diametre of barstock, mm, v - rolling rate, mm/s.
EFFECT: fatigue strength of shafts is increased, surface smoothness of shafts is also increased, effort of operation drive of mill is reduced and power consumption is reduced.
SUBSTANCE: invention is provided for optimisation of rolling process, reduction of power inputs, productivity gain, increasing of accuracy and quality of products. Method includes application of deformation effort to blank from tool with providing of incremental surfacing of specified shape and length. Creation of conditions, at which rolling efforts are closed to the structure of rolling mill, it is provided ensured by that blank is directed by motionless locating block by means of rolling roller in circular wedge, formed by clearance between locating block and rolling roller, and dimensional accuracy of product is directed, regulating clearance between roller and locating block.
EFFECT: optimisation of rolling process, reduction of power inputs, productivity gain, increasing of accuracy and quality of products.
2 cl, 2 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to construction reinforced concrete structures. To increase adhesion between reinforcements and concrete, load bearing capacity in compression, and fire resistance, rolled section reinforcements are rolled from tubular billets of alloyed steel "25Г2С", "30ХГ2С", "35ГС" intended for reinforced concrete structures, and reef-like ledges are rolled on their surface. Note here that said ledges are rolled in hot state by transverses rolling along left of right mono- or multifilar helix.
EFFECT: higher adhesion.
1 tbl, 2 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to tube billet flange rolling-off. Blank is subjected to rotary swaging by roller arranged at the angle 25°<β1<30° to blank axis to form truncated cone at its deformable part. Truncated cone section abutting on its base is deformed by forced displacement of the roll located at 8°<β2<12° to blank axis to form preliminary flange. Preliminary flange is deformed to strain-free section of truncated cone by forced displacement of the roller located at 50°<α<70° to blank axis.
EFFECT: expanded performances.
3 dwg, 1 tbl, 1 ex