阅读说明：本技术 一种三环槽复合回转件冷搓成形工装 (Cold forming frock of rubbing with hands of compound rotating member of three annular ) 是由 朱景秋 张东民 姚松峻 吕雷雷 周伟民 刘红涛 周强 王磊 张玉鹏 于 2020-04-29 设计创作，主要内容包括：本发明公开了一种三环槽复合回转件冷搓成形工装,包括冷搓成形模具、冷搓成形模具包括相对设置的第一冷搓板和第二冷搓板,第一冷搓板上设置有第一夹紧环槽、第一断颈槽、第一锁紧环槽,第二冷搓板上设置有第二夹紧环槽、第二断颈槽、第二锁紧环槽；第二冷搓板与驱动装置连接,驱动装置驱动第二冷搓板沿平行于第一冷搓板的水平方向往复运动,第一冷搓板固定设置并在冷搓过程中保持静止,第一冷搓板与第二冷搓板加工形成三槽复合回转件。搓板位置调整装置用于调整并固定成形前模具的位置,保证工件成形后不会出现错齿、槽形不饱满等问题；本发明的三槽复合回转件冷搓成形工装,可同时搓出具有三种不同槽型复合的回转件,提高了零件的生产效率。(The invention discloses a cold-rolling forming tool for a three-ring-groove composite rotating part, which comprises a cold-rolling forming die, wherein the cold-rolling forming die comprises a first cold rolling plate and a second cold rolling plate which are oppositely arranged, the first cold rolling plate is provided with a first clamping ring groove, a first neck breaking groove and a first locking ring groove, and the second cold rolling plate is provided with a second clamping ring groove, a second neck breaking groove and a second locking ring groove; the second cold rubbing plate is connected with the driving device, the driving device drives the second cold rubbing plate to reciprocate along the horizontal direction parallel to the first cold rubbing plate, the first cold rubbing plate is fixedly arranged and keeps static in the cold rubbing process, and the first cold rubbing plate and the second cold rubbing plate are processed to form the three-groove composite rotating part. The washboard position adjusting device is used for adjusting and fixing the position of a forming front die, and the problems of staggered teeth, incomplete groove shape and the like are avoided after a workpiece is formed; the cold twisting forming tool for the three-groove composite rotary member can simultaneously twist out the rotary member with three different groove types, so that the production efficiency of parts is improved.)

1. A cold-rolling forming tool for a three-ring-groove composite rotating part comprises a cold-rolling forming die and is characterized in that the cold-rolling forming die comprises a first cold rolling plate and a second cold rolling plate which are arranged oppositely, a first clamping ring groove, a first neck breaking groove and a first locking ring groove are sequentially arranged on the end face, opposite to the second cold rolling plate, of the first cold rolling plate along the longitudinal direction, and a second clamping ring groove, a second neck breaking groove and a second locking ring groove are sequentially arranged on the end face, opposite to the first cold rolling plate, of the second cold rolling plate along the longitudinal direction; the center line of the first cold washboard is aligned with the center line of the second cold washboard, the center lines of the first clamping ring groove and the second clamping ring groove are aligned, the center lines of the first neck breaking groove and the second neck breaking groove are aligned, and the center lines of the first locking ring groove and the second locking ring groove are aligned; the second cold washboard is connected with a driving device, the driving device drives the second cold washboard to reciprocate along the horizontal direction parallel to the first cold washboard, and the first cold washboard is fixedly arranged; the first cold rubbing plate is kept static in the cold rubbing process, the second cold rubbing plate reciprocates in the horizontal direction parallel to the first cold rubbing plate in the cold rubbing process, and the first cold rubbing plate and the second cold rubbing plate are processed to form the three-ring-groove composite rotating part.

2. The cold rubbing forming tool for the composite rotating member with the three ring grooves according to claim 1, further comprising a rubbing plate position adjusting device, wherein the rubbing plate position adjusting device is provided with a turbine worm pair and a rubbing plate adjusting bolt rod, the turbine worm pair and the rubbing plate adjusting bolt rod are coaxially arranged, and the rubbing plate position adjusting device is connected with the first cold rubbing plate through the turbine worm pair and the rubbing plate adjusting bolt rod and is used for adjusting the distance between the first cold rubbing plate and the second cold rubbing plate.

3. The tooling for cold rolling and forming the composite rotating member with the three ring grooves as claimed in claim 1, wherein the first cold rolling plate is fixed in a first cold rolling plate frame through a locking bolt, and the first cold rolling plate frame is connected with a chute of the first cold rolling plate frame through a tenon joint; the second cold washboard is fixed in a second cold washboard frame through a locking bolt, the second cold washboard frame is connected with a second cold washboard frame sliding groove in a sliding mode, a sliding way fixing block and a sliding groove gasket are arranged on the second cold washboard frame sliding groove and used for adjusting the position of the second cold washboard frame in the second cold washboard frame sliding groove, and the second cold washboard frame is fixed in the second cold washboard frame sliding groove through a sliding way locking plate and a locking screw; the tooling fixing plate is fixedly connected with the chute stressing plate and the chute large vertical plate, and the chute large vertical plate is fixed on the chute of the second cold washboard plate frame through a bolt.

4. The cold rubbing forming tool for the composite rotating member with the three ring grooves as claimed in claim 1, wherein the first clamping ring groove, the first neck breaking groove and the first locking ring groove are provided with a biting section, a finishing section and an exiting section in sequence along a transverse direction; the first clamping ring groove and the second clamping ring groove are used for forming clamping ring grooves; the first neck breaking groove and the second neck breaking groove are used for forming the neck breaking grooves; the first locking ring groove and the second locking ring groove are used for forming locking ring grooves; the composite rotating part with the three ring grooves comprises the clamping ring groove, the neck breaking groove and the locking ring groove.

5. The cold rolling forming tool for the composite rotating part with the three ring grooves as claimed in claim 4, wherein the clamping ring groove, the neck breaking groove and the locking ring groove are all non-lift angle ring grooves; the cross section of the clamping ring groove is trapezoidal, and the cross section of the neck breaking groove is arc-shaped; the cross section of the locking ring groove is isosceles trapezoid.

6. The tooling for cold rolling and forming the composite rotating member with the three ring grooves as claimed in claim 1, wherein a plurality of positioning gaskets are arranged at the upper end of the first cold rolling plate.

7. The tooling for cold rolling and forming the composite rotating member with the three ring grooves according to claim 3, wherein two guide rails are arranged at the bottoms of the sliding grooves of the first cold rolling plate frame and the first cold rolling plate frame, the two guide rails are arranged in parallel on the same plane, and the cross sections of the two guide rails are respectively isosceles trapezoid and rectangular.

8. The cold rolling forming tool for the composite rotating part with the three ring grooves as claimed in claim 4, wherein the length of the biting section is 1.2 pi d-2 pi d, the biting angle of the biting section is α 1, wherein 1.5 ° - α 1 ° -5 ° -1 °, the length of the finishing section is 3 pi d-5 pi d, the length of the withdrawing section is 1 pi d-1.5 pi d, the withdrawing angle of the withdrawing section is α 2, wherein 3 ° - α 2 ° -6 °, wherein d is the diameter of the blank.

9. The cold rolling forming tool for the composite rotating member with the three ring grooves as claimed in claim 4, wherein the biting section is subjected to sand blasting treatment by using emery.

10. The tooling of claim 1, wherein the first cold-rolling plate and the second cold-rolling plate are Cr₁₂MoV cold rolling die steel material.

Technical Field

The invention belongs to the technical field of metal cold plastic forming, and particularly relates to a cold twisting forming tool for a three-ring-groove composite rotating member.

Background

The traditional production process of the three-ring groove composite rotating member comprises two production processes, namely, a groove turning process in a chip removing mode is adopted, so that the material is wasted, the efficiency is low, and the organization structure and the mechanical property of a metal material are influenced; and secondly, a sectional type cold rubbing forming process is adopted, namely different groove shapes are formed in stages, and the problems of low groove shape precision and the like are easily caused because the production efficiency is low and parts cannot be produced efficiently although the metal streamline shape is good and the material utilization rate is reasonable.

Disclosure of Invention

The invention provides a cold twisting forming tool for a three-ring-groove composite rotating member, wherein a rotating member with three different groove types is simultaneously twisted, so that the production efficiency of parts is improved.

The technical scheme of the invention is as follows:

a cold-rolling forming tool for a three-ring-groove composite rotating part comprises a cold-rolling forming die, wherein the cold-rolling forming die comprises a first cold rolling plate and a second cold rolling plate which are arranged oppositely, a first clamping ring groove, a first neck breaking groove and a first locking ring groove are sequentially arranged on the end face, opposite to the second cold rolling plate, of the first cold rolling plate along the longitudinal direction, and a second clamping ring groove, a second neck breaking groove and a second locking ring groove are sequentially arranged on the end face, opposite to the first cold rolling plate, of the second cold rolling plate along the longitudinal direction; the center line of the first cold washboard is aligned with the center line of the second cold washboard, the center lines of the first clamping ring groove and the second clamping ring groove are aligned, the center lines of the first neck breaking groove and the second neck breaking groove are aligned, and the center lines of the first locking ring groove and the second locking ring groove are aligned; the driving device is connected with the second cold washboard and drives the second cold washboard to reciprocate along the horizontal direction parallel to the first cold washboard, and the first cold washboard is fixedly arranged; the first cold rubbing plate is kept static in the cold rubbing process, the second cold rubbing plate reciprocates in the horizontal direction parallel to the first cold rubbing plate in the cold rubbing process, and the first cold rubbing plate and the second cold rubbing plate are processed to form the three-ring-groove composite rotating part.

Preferably, the device further comprises a washboard position adjusting device, the washboard position adjusting device is provided with a turbine worm pair and a washboard adjusting bolt rod, the turbine worm pair and the washboard adjusting bolt rod are coaxially arranged, the washboard position adjusting device is connected with the first cold washboard through the turbine worm pair and the washboard adjusting bolt rod, the turbine rod pair is rotated to push the first cold washboard rack sliding groove and the first cold washboard rack sliding on the rail, a gap between the first cold washboard and the second cold washboard is adjusted, and the blank is guaranteed to be clamped.

Preferably, the first cold washboard is fixed in the first cold washboard frame through a locking bolt, and the first cold washboard frame is connected with the first cold washboard frame sliding chute through a joggle; the second cold washboard is fixed in a second cold washboard plate frame through a locking bolt, the second cold washboard plate frame is connected with a second cold washboard frame sliding chute in a sliding mode, the dovetail groove shape of the second cold washboard plate frame is complementary with the shape of the second cold washboard plate frame sliding chute, a sliding rail fixing block and a sliding chute gasket are arranged on the second cold washboard plate frame sliding chute and used for adjusting the position of the second cold washboard plate frame in the second cold washboard plate frame sliding chute to ensure that the second cold washboard plate frame can slide freely, and the second cold washboard plate frame is fixed in the second cold washboard plate frame sliding chute through a sliding rail locking plate and a locking screw; the tooling fixing plate is fixedly connected with the chute stressing plate and the chute large vertical plate, and the chute large vertical plate is fixed on the chute of the second cold washboard plate frame through a bolt, so that the workpiece can be ensured to stably and reliably complete the cold washboard process.

Preferably, the first clamping ring groove, the first neck breaking groove and the first locking ring groove are provided with a biting section, a finishing section and an exiting section in sequence along the transverse direction; the biting section is used for biting a blank and roughly processing the blank, the finishing section is used for finely processing the blank, and the withdrawing section is used for unloading the blank; the first clamping ring groove and the second clamping ring groove are used for forming clamping ring grooves; the first neck breaking groove and the second neck breaking groove are used for forming the neck breaking grooves; the first locking ring groove and the second locking ring groove are used for forming locking ring grooves; the composite rotating part with the three ring grooves comprises the clamping ring groove, the neck breaking groove and the locking ring groove, and the cross section of the finishing section of the first clamping ring groove is the same as that of the finishing section of the second clamping ring groove and is complementary with that of the clamping ring groove; the cross section shape of the finishing section of the first neck breaking groove is the same as that of the finishing section of the second neck breaking groove, and is complementary with that of the neck breaking groove; the cross section shape of the finishing section of the first locking ring groove is the same as that of the finishing section of the second locking ring groove, and is complementary with that of the locking ring groove.

Preferably, the clamping ring groove, the neck breaking groove and the locking ring groove are all non-lift angle ring grooves; the cross section of the clamping ring groove is trapezoidal, and the cross section of the neck breaking groove is arc-shaped; the cross section of the locking ring groove is isosceles trapezoid.

Preferably, a plurality of positioning gaskets are arranged at the upper end of the first cold rubbing plate, and the workpiece slotting position can be quickly adjusted by adjusting the number of the adjusting gaskets.

Preferably, the bottom of the chute of the first cold washboard grillage and the bottom of the chute of the first cold washboard grillage are provided with two guide rails which are arranged in parallel on the same plane, and the cross sections of the two guide rails are isosceles trapezoid and rectangular respectively.

Preferably, the length of the biting section is 1.2 pi d to 2 pi d, the biting angle of the biting section is α 1, wherein 1.5 DEG or more and α 1 or less and 5 DEG are included, the length of the finishing section is 3 pi d to 5 pi d, the length of the withdrawing section is 1 pi d to 1.5 pi d, and the withdrawing angle of the withdrawing section is α 2, wherein 3 DEG or more and α 2 or less and 6 DEG are included, wherein d is the diameter of the blank.

Preferably, the biting section is subjected to sand blasting treatment through carborundum to increase the roughness and the friction force.

Preferably, the first cold washboard and the second cold washboard are made of Cr₁₂The MoV cold-rolling die steel material has high hardenability, high strength and good wear resistance.

Compared with the prior art, the invention has the following beneficial effects:

according to the cold-twisting forming tool for the three-ring-groove composite rotating part, the rotating part with three different groove types can be simultaneously twisted by the first cold twisting plate and the second cold twisting plate, and the blank continuously and radially deforms under the action of the movement of the second cold twisting plate, so that the purpose of simultaneously forming the part clamping ring groove, the neck breaking groove and the locking ring groove is achieved, the production efficiency is improved, the working length of the cold twisting plate is effectively controlled, and the stroke of a cold twisting machine is shortened;

the invention provides a cold rolling forming tool for a three-ring-groove composite rotating member, belongs to the field of metal cold plasticity forming, does not need heating, is environment-friendly and energy-saving, and has good mechanical property and mechanical property of parts, high material utilization rate and low cost;

according to the cold rolling forming tool for the three-ring-groove composite rotating member, the grooving position of a part can be quickly adjusted by adjusting the number of the adjusting gaskets, the universality of a die is improved, and the cost is saved;

according to the cold rubbing forming tool for the three-ring-groove composite rotating member, a self-locking function is achieved by adjusting the rubbing plate position adjusting device, and the stability of the mechanism is improved.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

FIG. 1 is a schematic perspective view of a three-ring groove composite rotating member cold rolling forming tool of the present invention;

FIG. 2 is a front view of a cold rolling forming die of the cold rolling forming tool for the three-ring groove composite rotating member of the present invention;

FIG. 3 is a top view of a first cold washboard of the tooling for cold-rolling and forming the composite rotating member with three ring grooves of the present invention;

FIG. 4 is a cross-sectional view of a first cold washboard of the tooling for cold-rolling and forming the composite rotating member with three ring grooves of the present invention;

FIG. 5 is a cross-sectional view taken at A-A of FIG. 4 in accordance with the present invention;

FIG. 6 is a cross-sectional view taken at B-B of FIG. 4 in accordance with the present invention;

FIG. 7 is a cross-sectional view taken at C-C of FIG. 4 in accordance with the present invention;

FIG. 8 is a top view of a second cold washboard of the tooling for cold-rolling and forming the composite rotating member with three ring grooves of the present invention;

FIG. 9 is a sectional view of a second cold washboard of the tooling for cold-rolling and forming the composite rotating member with three ring grooves of the present invention;

FIG. 10 is a schematic perspective view of a guide rail of a cold rolling forming tool for a three-ring groove composite rotating member according to the present invention;

FIG. 11 is a schematic cross-sectional view of a washboard position adjustment device of a tooling for cold-rolling and forming a composite rotating member with three ring grooves according to the present invention;

FIG. 12 is a schematic view of a three-ring groove composite rotating member according to the present invention.

The labels in the figure are: 1-fixing a tool; 2-chute gusset plate; 3-a chute large vertical plate; 4-slideway locking plate; 5-locking the screw; 6-slideway fixing block; 7-a second cold washboard frame; 8-blank; 801-clamping ring groove; 802-neck breaking groove; 803-locking ring groove; 9-locking bolts; 10-a first cold washboard frame chute; 11-positioning the gasket; 12-a turbine worm gear pair; 13-washboard adjusting screw; 14-a guide rail; 15-a first cold washboard rack; 16-a first cold washboard; 1601-bite segment; 1602-finishing section; 1603-exit section; 1604-a first clamping ring groove; 1605-first neck break groove; 1606-a first locking ring groove; 17-a second cold washboard; 1701-a second clamping ring groove; 1702-second breakneck groove; 1703-a second locking ring groove; 18-chute gasket; 19-second cold washboard grillage chute.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. In practice, the invention will be understood to cover all modifications and variations of this invention provided they come within the scope of the appended claims.

For a better illustration of the invention, the invention is described in detail below with reference to the accompanying figures 1-12.

As shown in fig. 1-4 and fig. 8-9, a cold rolling forming tool for a three-ring-groove composite rotating part comprises a cold rolling forming die, wherein the cold rolling forming die comprises a first cold rolling plate 16 and a second cold rolling plate 17 which are oppositely arranged, a first clamping ring groove 1604, a first neck breaking groove 1605 and a first locking ring groove 1606 are sequentially arranged on the end surface, opposite to the second cold rolling plate 17, of the first cold rolling plate 16 along the longitudinal direction, and a second clamping ring groove 1701, a second neck breaking groove 1702 and a second locking ring groove 1703 are sequentially arranged on the end surface, opposite to the first cold rolling plate 16, of the second cold rolling plate 17 along the longitudinal direction; the first cold washboard 16 centerline is aligned with the second cold washboard 17 centerline, the first clamping ring groove 1604 is aligned with the second clamping ring groove 1701 centerline, the first breaking neck groove 1605 is aligned with the second breaking neck groove 1702 centerline, and the first locking ring groove 1606 is aligned with the second locking ring groove 1703 centerline; a driving device is connected with the second cold washboard 17 and drives the second cold washboard 17 to reciprocate along the horizontal direction parallel to the first cold washboard 16, and the first cold washboard 16 is fixedly arranged; the first cold rubbing plate 16 is kept static in the cold rubbing process, the second cold rubbing plate 17 reciprocates in the horizontal direction parallel to the first cold rubbing plate 16 in the cold rubbing process, and the first cold rubbing plate 16 and the second cold rubbing plate 17 are processed to form a three-groove composite rotating member. Here, the driving device is a driving device commonly used in the prior art, such as a crank-slider mechanism, and the crank is a driving member, so as to achieve a reciprocating motion.

With continued reference to fig. 1 and combined fig. 11, the device further includes a washboard position adjusting device, the washboard position adjusting device is provided with a turbine worm pair 12 and a washboard adjusting bolt rod 13, the turbine worm pair 12 and the washboard adjusting bolt rod 13 are coaxially arranged, the washboard position adjusting device is connected with the first cold washboard 16 through the turbine worm pair 12 and the washboard adjusting bolt rod 13, the turbine rod pair 12 is rotated to push the first cold washboard frame sliding groove 19 and the first cold washboard frame 15 to slide on the rail 14, a gap between the first cold washboard 16 and the second cold washboard 17 is adjusted, and the blank 8 is guaranteed to be clamped. The washboard position adjusting device is used for adjusting and fixing the position of a forming front die, and the problems of staggered teeth, incomplete groove shape and the like after a workpiece is formed are avoided.

The first cold washboard 16 is fixed in the first cold washboard frame 15 through a locking bolt 9, and the first cold washboard frame 15 is connected with the first cold washboard frame sliding chute 10 through a tenon joint; the second cold washboard 17 is fixed in a second cold washboard frame 7 through a locking bolt 9, the second cold washboard frame 7 is connected with a second cold washboard frame sliding chute 19 in a sliding manner, the dovetail groove shape of the second cold washboard frame 7 is complementary with the shape of the second cold washboard frame sliding chute 19, a slideway fixing block 6 and a chute gasket 18 are arranged on the second cold washboard frame sliding chute 19 and used for adjusting the position of the second cold washboard frame 7 in the second cold washboard frame sliding chute 19, and the second cold washboard frame 7 is fixed in the second cold washboard frame sliding chute 19 through a slideway locking plate 4 and a locking screw 5; the tooling fixing plate 1 is fixedly connected with the chute stressing plate 2 and the chute large vertical plate 3, and the chute large vertical plate 3 is fixed on the second cold washboard frame chute 19 through a bolt.

Referring to fig. 1 and 10, in this embodiment, the first cold washboard 16 and the second cold washboard 17 are respectively installed on a first cold washboard rack and a second cold washboard rack of the thread rolling machine, the second end of the second cold washboard 17 is contacted with the first end of the groove of the second cold washboard frame 7, the second cold washboard 17 is fixed through the locking bolt 8, the shape of the dovetail groove of the second cold washboard frame 7 is complementary with the shape of the chute 19 of the second cold washboard frame, the second cold washboard frame 7 is arranged on the second cold washboard frame sliding chute 19 through the sliding chute gasket 18, the sliding chute fixing block 6 and the locking screw 5, so that the second cold washboard frame 7 can freely slide, the second cold washboard grillage chute 19 is provided with a chute large vertical plate 3 and two chute stressing plates 2, so that the reliability of the device is improved.

Taking the second end of the second cold washboard 17 as a reference, installing the first cold washboard 16, adjusting the second end of the first cold washboard 16 and the second end of the first cold washboard 2, and respectively keeping the first end of the second cold washboard 17 and the first end of the first cold washboard 16 on a horizontal plane; the second end of the first cold washboard 16 is in contact with the first end of the groove of the first cold washboard frame 15, the position adjusting gaskets 11 are arranged at the first end of the first cold washboard 16 according to the size requirement of a part, the slotting position of the part can be adjusted, and the part is fixed through the locking bolts 9 on the thread rolling machine. The bottom of the first cold washboard grillage sliding groove 10 and the bottom of the first cold washboard grillage 15 are provided with a guide rail 14, the washboard adjusting screw 13 is installed on the first cold washboard grillage sliding groove 10 and the worm gear pair 12, the worm gear pair 12 is rotated to push the first cold washboard grillage sliding groove 10 and the first cold washboard grillage 15 to slide on the guide rail 14, and the gap between the first cold washboard 16 and the second cold washboard 17 is adjusted to ensure that the blank 8 is just compressed.

Referring to fig. 3-9, the first clamping ring groove 1604, the first breakneck groove 1605, and the first locking ring groove 1606 are provided with a snap-in section 1601, a finishing section 1602, and a withdrawal section 1603. The biting section 1601 is used for biting a blank of the three-groove composite rotating member to perform rough machining; a finishing section 1602 for finishing the blank passing through the biting section 1601; an exit section 1603 for unloading the workpiece passing through the finishing section 1602. The following describes the biting section 1601, the finishing section 1602, and the retreating section 1603.

Feeding the blank 8 to the biting section 1601 for compaction, wherein the length of the biting section 1601 is 1.2 pi d-2 pi d, where d is the diameter of the blank 8, and the second cold rolling plate 17 starts to move under the action of the thread rolling machine due to the biting angle α₁In the presence of (a) wherein 1.5 ° ≦ α₁Not more than 5 degrees, the blank 8 gradually generates indentation from shallow to deep, the blank 8 to the A-A section are respectively shaped preliminarily, namely the section of the clamping ring groove 801 is (A)₁、A₂、A₃) The shape of the neck breaking groove 802 is (A)₄、A₅、A₆) The locking ring groove 803 has the shape of (A)₇、A₈、A₉) At the end of the biting section 1601, the depth and shape of each groove substantially meet the requirements.

The biting section 1601 needs to be subjected to sand blasting treatment by using carborundum, so that the roughness of the biting section is increased, and the friction force is increased.

Entering the finishing section 1602, wherein the length of the finishing section 1602 is 3 pi d-5 pi d, wherein d is the diameter of the blank 8, at the moment, each groove shape is basically formed, only a small amount of metal flow occurs, each groove shape is corrected, the precision is improved, namely, the cross section 801 of the clamping ring groove is (B)₁、B₂、B₃) The shape of the neck breaking groove 802 is (B)₄、B₅、B₆) The locking ring groove 803 has the shape of (B)₇、B₈、B₉)。

Entering the exit section 1603, the length of the exit section 1603 is 1 pi d-1.5 pi d, wherein d is the diameter of the blank 8, and the exit angle of the exit section 1603 is α₂Wherein the angle is less than or equal to α when the angle is 3 degrees₂Less than or equal to 6 degrees; the parts are separated from the left and right cold washboards under the driving of the second cold washboards 17.

The clamping ring groove 801, the neck breaking groove 802 and the locking ring groove 803 are all straight groove; the section of the clamping ring groove 801 is trapezoidal, and the first clamping ring groove 1604 and the second clamping ring groove 1701 are used for forming the clamping ring groove 801; the cross section of the neck breaking groove 802 is arc-shaped, and the first neck breaking groove 1605 and the second neck breaking groove 1702 are used for forming the neck breaking groove 802; the cross section of the locking ring groove 803 is isosceles trapezoid, and the first locking ring groove 1606 and the second locking ring groove 1703 are used for forming the locking ring groove 803. Wherein the finishing section 1602 of the first clamping ring groove 1604 has the same cross-sectional shape as the second clamping ring groove 1701 and is complementary to the cross-sectional shape of the clamping ring groove 801. The finish 1602 cross-sectional shape of the first breakneck groove 1605 is the same as the cross-sectional shape of the second breakneck groove 1702, complementary to the cross-sectional shape of the breakneck groove 802. The cross-sectional shape of the finishing section 1602 of the first locking ring groove 1606 is the same as the cross-sectional shape of the second locking ring groove 1703, and is complementary to the cross-sectional shape of the locking ring groove 803.

The first cold washboard 16 and the second cold washboard 17 are made of Cr₁₂The MoV cold-rolling die steel is made of materials and has high hardenability, high strength and good wear resistance.

Referring to fig. 12, the blank continuously deforms radially under the action of the movement of the second cold washboard, so that the purpose that parts clamp the annular groove, the neck breaking groove and the locking annular groove are formed simultaneously is achieved, the production efficiency is improved, the working length of the cold washboard is effectively controlled, and the stroke of the cold washboard is shortened.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.