Mill for cross-wedge rolling
(57) Abstract:The invention relates to the processing of metals by pressure and can be used for making the step axles and shafts transverse rolling. The mill contains a rolling mill, on the upper traverse of which are mounted tooling plate carrying the V-tool. The lower yoke is made in the form of a rigid plate with a support element which carries the carriage and the rotating means for maintaining the workpiece. 12 C.p. f-crystals, 11 ill. The invention relates to a pressure treatment of materials, particularly to the cross-wedge rolling, and can be used for shafts and axles stepped profile.Known Stan for cross-wedge rolling (A. C. USSR N 978992, B 21 H 1/18, 1982), contains a frame on which is mounted a rolling mill with plane-parallel movable and immovable wedge tools.A disadvantage of the known mill is manifested in poor performance due to the presence of idling to return the movable tooling plate to its original position.The problem of productivity solved in the design of the mill (WO N 92/02318, B 21 H 1/18, 1992), adopted as protoblood. The mill contains a rolling mill, on which are mounted against each other, the upper tooling plate with wedge tool and the lower tool plate with a support element.The mill also contains installed on the supporting element can be moved along the longitudinal axis of the rolling stands of the carriage mounted in each of them with the possibility of rotation of the means for supporting the workpiece during the rolling process, is made of at least two bodies of rotation and connected by an endless chain drive its rotation and the tensioning mechanism.The disadvantage of this construction of the mill is the low accuracy of the geometric dimensions of rolled products and limited technological capability formation.The accuracy of the geometric dimensions of rolled products and their frequency of occurrence in batches received during rolling of billets, largely depends on the stability of force and kinematic rolling parameters: the stiffness of rolling stands, carriages and precision adjustment of the shut height.The low stiffness of the famous mill, carriage negatively affects the quality of rolled products. In addition, in CI. While rolling two or more workpieces, consistently asked in the treatment area, the occurrence of the first causes the tension section of the chain from the drive sprocket to the first carriage and the weakening of the chain tension in the subsequent sections. When coming into contact with the tool of the second workpiece located on the second carriage, is the first braking caused by the tension section of the circuit between the first and second carriages, then the jerk movement continues, because the load increases. The latter circumstance significantly destabilizes the conditions of rolling the first of the workpiece.The present invention is to improve the quality of the products obtained by improving their accuracy and expanding the technological capabilities of the mill.This object is achieved in that in the mill for cross rolling includes rolling stand, in the upper cross beam which is mounted tooling plate carrying the V-tool, and the lower cross beam mounted on the bottom plate with the supporting member, the supporting carriage with rotating means for maintaining the workpiece, which are interconnected by a chain drive mechanism chain tension, according iey made in the form of a wedge, placed in the upper guide beam with the elevation angle of the wedge surface, a large-angle locking and provided with a longitudinal adjusting screw mechanism, the longitudinal axis of the screw which is inclined to the wedge surface of the wedge at an acute angle.This embodiment extends the range and accuracy of the adjustment of the shut height of the mill, reduces force on the adjusting mechanism.It is advisable that the mill screw adjustment mechanism closed height was posted in two bearings self-aligning type, equipped with a planetary gearbox with a Vernier scale, and means fixing the upper wedge to fine tune the closed height of the mill.This provides a setting (elimination) of the accumulated error of planting gaps in the dimension chain mechanism in the process of its Assembly, eliminates the distortions in Klenova the adjustment mechanism closed height and improves the accuracy of the count.Preferably, the mill body rotation means for maintaining the blanks were kinematically connected with the body of the carriage through a modular cushion elements and prisms.Performing modular cushion cell battery (included) what about the other, expanding the technological capabilities of the mill through the use of various schemes rolling: wedge-roller; a wedge-wedge; wedge-roller-wedge.Possible execution of the design of the mill, in which the rear part of the carriage is kinematically linked to through the bar, axle which is placed in the joints of the relative position of the carriage and chain, and the joints of the relative movement is made in the form of clips, movably articulated with the axes of the bushings of the chain and provided with guides for the pins of the beam.The performance of the mill compensates for the difference in size of the traction chains, increases the accuracy of the parameters node of the carriage and prevents tilting of the carriage when passing her driving (leading), stars, when a straight line segment of the chain is replaced by the radius, and with the passage of the lower branch of the chain.The execution of the construction of the camp that every body rotation of the carriage can be made in the form axis, where at least two rollers, and at least one of the rollers is placed on axis with the possibility of forward movement, and the carriage is thus provided with a longitudinal rigid support locking position for the axis of rotation bodies, expanding technology who's who.In addition, you can perform a rolling mill in which the chain drive would be equipped with a reverse that would be placed on the axis of the driven drive sprocket and is made in the form of the motor.This design is aimed at ensuring constant tension in the chain due to sampling gaps in the chain transmission that provides smooth entry into contact with the tool subsequent rolling of the workpiece while simultaneously rolling two or more workpieces, consistently asked in the treatment area. In addition, if you install two hydraulic motors for actuators leading and driven sprockets, shafts which tend to rotate in different directions, there is a possibility of smooth adjustment of the rolling speed and the implementation of the reverse circuit to return to its original position.The invention is illustrated by drawings:
Fig. 1 depicts the General design of the mill, side view;
Fig. 2 is the same as in Fig. 1, a view in plan;
Fig. 3 - section a-a in Fig. 1;
Fig. 4 - section b-B in Fig. 1;
Fig. 5 - node of the carriage structure means to support the workpiece;
Fig. 6 - node carriage with one of the provisions of the modular cushion elements and prisms;
Fig. 7 is the same as in Fig. 6, the 0 - same as in Fig. 8, a top view;
Fig. 11 is a view along arrow G in Fig. 10.A mill for cross-wedge rolling is shown in Fig. 1-4, includes rolling stand 1, on the upper cross beam 2 which is mounted the tool plate 3 carrying the V-tool 4 and the mechanism 5 adjustments closed height of the camp, and the output of the mill from the emergency provisions - jamming. The lower traverse rolling stands 1 made in the form of the bottom plate 6 with the supporting member 6, the supporting carriage 8 9 tel rotation means 10 for supporting the workpiece 11. Carriage means 8 and 10 are connected by chain drive 12 with the mechanism 13 chain tension 14.Crate 1 is a rigid closed structure consisting of the upper beam 2 and the lower beam 6, tied to each other through the hard elements 15 threaded couplers 16. Mechanism 5 adjustments closed height "H" of the mill is made in the form of a wedge 17, posted in the guides 18 of the upper beam 2, with the elevation angle of the wedge surface 19, a large angle-locking (5 - 7o). Mechanism 5 provided with a longitudinal adjusting screw mechanism 20, the longitudinal axis "Oh" lead screw 21 which is inclined to the wedge surface 19 of the wedge 17 at an acute angle . In ozena in the bore 23 of the wedge 17 and consists of two polygeek 24 and 25, through which is threaded a screw 21 and between which is placed cylindropuntia "heel" 26, the supporting surface 27 which are associated with cylindropuntia support surfaces made in the body of the wedge 17.The second bearing 28 lead screw 21 is located in the bore 29 of one of the rigid elements 15 and made in the form of cylindropuntia "thrust bearing" 30 covering the screw 21 and is fixed between the collar 31 on the screw 21 and the retainer 32, rigidly connected with the screw 21. To provide a given law translational movement of the wedge mechanism 17 5 adjustments closed height is equipped with a planetary gear 33 is placed on the shank of the screw 21. One of the sun wheels 34 of the gear 33 is fixed by a bearing 35 slip on driving the screw 21 and is rigidly connected with the rotating body 36 of the gearbox. The other sun wheel 37 is connected with the lead screw 21 is rigidly by means of pins 38. The hub of the sun gear 39 on a sliding fit is placed in the bore of the rotating body 36 of the gear 33. The sun gear 34 and 37 kinematically connected with satellites 40 and 41, respectively, rigidly connected with a common shaft 42, the pin 43 on which the bearing is placed in the rotating body 36. The gear 33 SN is the "H" - the number of revolutions of the gear case 33".Mechanism 5 adjustments closed height provided with means 45 of the latching movement of the upper wedge 17 according to a given adjustment of the closed height of the mill. The means 45 (Fig. 1-3) are placed in vertical channels 46 of the upper beam 2 and is made in the form of l-shaped retainers 47 (Fig. 3), the rod of which is kinematically connected by means of springs 48 and compression nut 49 with the body of the upper beam 2.Chain drive 12 (Fig. 2) contains the leading sprocket 50 mounted on the shaft 51, the gear 52 and the hydraulic motor 53, and the driven sprocket 54 mounted on a shaft 55, which is also equipped with gear 56 and the motor 57. The motors 53 and 57 have different directions of rotation. The actuator is made from a self-contained hydraulic plant 58 through Gidromontazh 59.The body 9 of the rotation means 10 for supporting the workpiece 11 is kinematically connected with the housing 60 of the carriage 8 by means of the modular cushion elements prisms 61 and 62 (Fig. 5,6), which is supplied with unified landing sites 63 with the ability to reinstall relative to each other in the bed of the 64 seats node 63. The elements of the prism 61 and 62 have outer faces 65 and 66 are configured to mate with each other is a screw-unified tacks 68, passed through the housing elements 61, prisms 62 and the housing 60 of the carriage 8, respectively.Every body 9 of rotation (Fig. 7, 8) of the carriage 8 is made in the form axis 69, passed through modular cushion elements 61, which includes at least two rollers 70 (Fig. 8). At least once rollers 70 can be placed on the axis 69 with the possibility of translational movement in the direction of the compression spring 71, which is located on the axis 69 between the roller body 70 and cap 72. Through the axis 69 is omitted screw sticking 68.The rear portion 73 of the carriage 8 (Fig. 9, 10) kinematically connected with the chain 14 by means of the bar 74, the pin 75 which is placed in the joints 76 relative position of the carriage 8 and the circuit 14. The compensator 76 relative movement is made in the form of clamps 77, movably articulated with the axis 78 (Fig. 11) bushings circuit 14, and is provided with longitudinal guides 79 to the pins 75 of the bar 74.The carriage 8 (Fig. 9, 10) is provided with a longitudinal rigid support 80 locking position of axis 81 69 9 tel rotation. Hard bearing 80 is made in the form of strips prismatic section with cavities 81 semi-cylindrical shape, is located along the longitudinal axis of the carriage 8 and is rigidly connected to the carriage 8. The longitudinal axis of the depressions 81 perpendic the Ana (Fig. 6), is working on his part of the lower wedge tool 82.Each of the carriages 8 kinematically connected with the circuits 14 through the carrier 83, the pin 84 which is pivotally attached to the clamps 85. Led 81 is connected with the front part of the carriage by means of an adjusting screw 86 and spherical hinge 87 (Fig. 10).The work stated on the mill as follows. The drawing of the part and force parameters of the rolling process produces adjustment of the shut height "H", for which the mechanism 5 adjustments closed height release means 45 of the fixing upper wedge 17 (Fig. 1, 3), with l-shaped latches 47 are removed from the force of contact with the body of the upper beam 2 by unscrewing the nuts 49 means 45 of the detent, whereupon the spring 48 compression unloaded and removed from force interaction of l-shaped retainer 47 and the yoke 2. Next, through the planetary gear 33 is placed on the shank of the screw 21, asking the law of movement of the upper wedge 17 on the Vernier scale 44, protonirovannoi by the dependence of the translational movement of the wedge 17 is closed, the height "H" is the number of turns of the body 36 of the gear 33. During rotation of the body 36 rotates rigidly associated with such connection allows the transfer of torque from the sun gear 34 sun wheel 37, rigidly connected with the lead screw 21, with the reduction of torque by the given law. For example, one revolution of the gear case is equal to the increase or decrease in a closed height "H" 0.01 mm lead screw 21, having reduced torque from the housing 36 of the gear 33, converts rotary motion to linear motion of the wedge 17 through the fallopian polygeek 24 and 25. The use of two supports floating type 22 and 28, it is necessary to compensate for error in the manufacturing process of the bore 29 of one of the rigid elements 15 (fixed bearing) and the bore 23 of the wedge 17 (rolling element) through which skipped lead screw 21. During Assembly of the mechanism 5 adjustments closed height using supports floating type eliminates crimping and bending the lead screw between the rigid element 15 and the body of the wedge 17. In addition, supports floating type allow the build process to select all the backlash Assembly-dimensional chains.Use in the claimed mill tilt at an acute angle to the longitudinal axis of the lead screw 21 to the wedge surface 19 of the wedge 17 is determined by the following calculations and experiments. In the process of rolling one of the components of the spacer efforts acts along the wedge surface 19, p is osastot the same component spacer rolling forces, as klinovuyu surface 19 with regard to the friction force in the wedge pair 19-17. If the axis of the screw 21 will be executed in parallel wedge surfaces 19, all the value component of the spacer efforts will be in the lead screw 21, which is undesirable. Lead screw 21 is the main element of precision adjustment of the closed height of the mill, so it was necessary to create a design aimed at reducing the magnitude of the spacer component of the forces acting on the lead screw 21. This decision was the realization of the axis of the lead screw at an acute angle to the wedge surface 19, the smaller the angle, the angle of the wedge surface 19.As shown by the calculation of the force polygon such a performance axis lead screw leads to a significant reduction of the magnitude component of the spacer efforts, acting in the direction of the axis of the lead screw and to improve the accuracy of the adjustment mechanism closed height.After adjusting the shut height of the mill means 45 of the fixing upper wedge 17 by means of nuts 49 lead in its original state.Depending on the scheme rolling: "wedge-roller or wedge-wedge" carry out the adjustment of the tool 10 to maintain sage unified landing sites 63 is placed in the box 64 by pairing with each other. When this prism 62, respectively, are placed in the peripheral zone of the bed 64 (Fig. 5) and in the process of rolling the workpiece 11 is placed on the body 9 of rotation of the tool 10, to maintain the workpiece upper wedge tool 4.When using schema "wedge-wedge" modular cushion elements 61 9 tel rotation is placed in a peripheral zone of the bed 64 of planting node 63, and the prism 62 is placed adjacent to each other between the modular cushion elements 61. Thus obtained collected the carriage 8 (Fig. 6) cover the lower wedge tool 82, respectively fixing it rigidly in table 8 (the tabs on the drawing conventionally not shown) and carry out the process of rolling the workpiece 11 between the tool 4 and 82.When rolling the carriage 8 should support surface 7 for the planet carrier 83. With the passage of the carriage 8 zone sprocket 50 or (driven) sprocket 54 they have the effect of "tipping". To exclude the effect of tilting the rear portion 73 of the carriage 8 is connected with the chain 14 by means of the bar 74, the pin 75 which is placed in the joints 76 relative position of the carriage 8 and the circuit 14. Longitudinal guide 79 made in the body of the shroud 77, allows you to move the pin 7 is ogene (over chain drive) in the lower position (under chain drive).To expand the technological capabilities of the mill every body 9 of rotation (Fig. 7, 6) of the carriage 8 is made of at least two rollers 70 (Fig. 8), with one of the rollers 70 is placed in the carriage 8 with the possibility of forward movement on the axis 69. The performance of the rotation body 9 allows you to roll the workpiece, the diameter of which is smaller than the height "boarding valleys" formed between two adjacent rollers 70. The execution of the body 9 of rotation of the two rollers 70, is placed on the peripheral portions of the axis 69, allows the passage of the upper wedge tool 4 between them in the formation process of the workpiece 11. Depending on the configuration of the wedge tool 4 to reduce the deflection of the workpiece 11 and one of the rollers 70 in the rolling process carries out a translational movement along the axis 69 synchronous rolling of the billet 11.In the process of rolling bodies 9 means 10 for supporting the workpiece 11 and, respectively, the axis 59 9 tel rotation are impacted by the size of the spacer efforts up to 50 - 60%. In this regard, the means 10 for supporting the workpiece 11 should be more requirements of rigidity and structural strength. To ensure this requirement, the carriage 8 (Fig. 9, 10) f is atki using a roller bearing 70 80 provides the fixation of the position of the axes 59 without increasing the deflection of distance from roll force, performing the role of an additional center support 80 (Fig. 8, 9).In the rolling process of the accumulation of the error of the gaps in the branches of the chain drive can lead to distortions in the nodes of the carriage 8, i.e., may occur misalignment course of the branches of the circuits 14 and, consequently, reducing qualities rolling. This phenomenon leads to desynchronization of movement of the carriages and to the disturbance of the smooth running of the chain drive. To compensate for these factors in the rolling process include the reverse, which is made in the form of a hydraulic motor 57 through a gear 56 that is associated with the driven sprocket 54. Reversible drive means of hydraulic feedback associated with the hydraulic motor 53, a Manager of a leading asterisk 50. Thus, the presence of the reverse of the construction of the mill allows you to synchronize the rotation of the drive sprocket 54, eliminating the misalignment of the translational movement of the branches of the circuit 14, which contributes to solving the problem.The design of the mill passes industrial approbation in the manufacture of parts "axis of conveyor" (Pavlovsky autorepair plant) and firmware (zip AVTOVAZ).The design of the mill allows not inherent in the known analogues operation of prego key.Comparative tests of the current experimental sample stated mill allow us to conclude that the claimed mill technological capabilities provide not only rolling on a wedge-roller, wedge-wedge and wedge-roller-wedge", but and editing products in a wide range of diameters and lengths. The prototype is deprived of such opportunities.In addition, in comparative rolling parts axis of the conveyor, in the amount of 100 PCs box of dispersion diametrically size decreased by 50%. In a known design of mill rolled neck had a diameter of 15 to 0.1, the proposed 15 0,05. 1. Mill for cross-wedge rolling includes rolling stand, in the upper cross beam which is mounted tooling plate carrying the V-tool, and the lower cross beam mounted on the bottom plate with the supporting member, the supporting carriage with means for maintaining the workpiece in the form of rotating bodies, which are interconnected by a chain drive tensioner, characterized in that it is equipped with a mechanism for adjusting the shut height of the mill, made in the form of a wedge placed in the upper guide beam, with the elevation angle of the wedge surface, a large angle is th tilted to the wedge surface of the wedge at an acute angle.2. The mill under item 1, characterized in that the screw adjustment mechanism of a closed height of the mill are located in two self-aligning bearings.3. The mill under item 1 or 2, characterized in that the adjustment mechanism closed height is equipped with a planetary gearbox.4. The mill according to any one of paragraphs.1 to 3, characterized in that the adjustment mechanism closed height provided with a means of fixing the upper wedge height.5. The mill according to any one of paragraphs.1 to 4, characterized in that the chain drive is equipped with a reverse.6. The mill on p. 5, characterized in that the reverse is placed on the axis of the driven sprocket and is made in the form of the motor.7. The mill according to any one of paragraphs.1 - 6, characterized in that the body rotation means for maintaining the workpiece kinematically connected with the body of the carriage through a modular cushion elements and prisms.8. The mill on p. 7, characterized in that the modular cushion elements and prism provided with a uniform planting sites can reinstall relative to each other.9. The mill according to any one of paragraphs.1 to 8, characterized in that the rear part of the carriage kinematically sujana chain through the bar, axle which is placed in the joints otnositelnogo made in the form of clips, movably articulated with the axes of the bushings of the chain and provided with longitudinal guides for the pins of the beam.11. The mill according to any one of paragraphs.1 to 10, characterized in that each body rotation of the carriage is made in the form axis, where at least two rollers.12. The mill on p. 11, characterized in that at least one of the rollers is placed on axis with the possibility of axial movement.13. The mill according to any one of paragraphs.1 - 12, characterized in that the carriage is provided with a longitudinal rigid support locking position for the axis of rotation bodies.
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