阅读说明：本技术 一种减速机微小齿轮冷挤压成形设备及其工艺 (Cold extrusion forming equipment and process for micro gear of speed reducer ) 是由 沈毅 汪斌 孙海亮 于 2021-09-30 设计创作，主要内容包括：本发明公开的属于齿轮冷挤压成形技术领域,具体为一种减速机微小齿轮冷挤压成形设备及其工艺,包括支撑组件,所述支撑组件包括底板,所述底板两端固定连接支撑杆,所述支撑杆远离所述底板的一端可拆卸连接顶板,所述支撑组件上固定安装有驱动机构,所述驱动机构上设置有上模组件,所述支撑组件上安装有下模组件,本发明的有益效果是：通过设置驱动机构带动上模组件下降,使得上模组件中的凸模能够稳定地进行下降,从而使得加工的精度高,质量好,通过设置缓冲组件,凸模与凹模接触时进行缓冲,使得凸模与凹模接触刚接触时为柔性接触,再转化为刚性接触,从而使得工件的加工质量好,废品率低。(The invention discloses a cold extrusion forming device and a process for a miniature gear of a speed reducer, belonging to the technical field of cold extrusion forming of gears, and comprising a support assembly, wherein the support assembly comprises a bottom plate, two ends of the bottom plate are fixedly connected with support rods, one end of each support rod, far away from the bottom plate, is detachably connected with a top plate, a driving mechanism is fixedly arranged on the support assembly, an upper die assembly is arranged on the driving mechanism, and a lower die assembly is arranged on the support assembly, and the cold extrusion forming device has the beneficial effects that: the upper die assembly is driven to descend by the driving mechanism, so that the male die in the upper die assembly can descend stably, the machining precision is high, the quality is good, the male die is in buffer contact with the female die by the buffer assembly, the male die is in flexible contact with the female die when in rigid contact, and then the male die is in rigid contact with the female die, so that the machining quality of workpieces is good, and the rejection rate is low.)

1. The utility model provides a cold extrusion forming equipment of speed reducer micro gear, includes supporting component (5), supporting component (5) are including bottom plate (51), bottom plate (51) both ends fixed connection bracing piece (52), bracing piece (52) are kept away from the one end of bottom plate (51) can be dismantled and connect roof (53), its characterized in that: a driving mechanism (3) is fixedly mounted on the supporting component (5), an upper die component (1) is arranged on the driving mechanism (3), and a lower die component (2) is mounted on the supporting component (5);

the upper die component (1) comprises a first supporting plate (13), the bottom end of the first supporting plate (13) is fixedly connected with an upper die base (11), and the bottom end of the upper die base (11) is fixedly connected with a male die (12);

the lower die assembly (2) comprises a supporting seat (21), the top end of the supporting seat (21) is fixedly connected with an outer sleeve seat (23), a base plate (22) and a middle die seat (24) are sleeved inside the outer sleeve seat (23), a female die (26) is arranged in an inner cavity of the middle die seat (24), the middle die seat (24) and the female die (26) are connected through a buffer assembly (6) in a sliding mode, the outer wall of the bottom end of the female die (26) is connected with a sleeve seat (25) in a sliding mode, the bottom end of the sleeve seat (25) is fixedly connected with the middle die seat (24), the inner wall of the bottom end of the middle die seat (24) is connected with a top column (27) in a sliding mode, the bottom end of the top column (27) is fixedly connected with a first buffer spring (7), and the bottom end of the supporting seat (21) is fixedly connected with a bottom plate (51);

the buffer assembly (6) comprises a moving plate (61), the inner wall of the moving plate (61) is connected with a stabilizer bar (63) in a sliding mode, the top end of the stabilizer bar (63) is fixedly connected with a supporting block (62), a second buffer spring (64) is sleeved on the outer wall of the stabilizer bar (63), and the second buffer spring (64) is located below the moving plate (61);

the driving mechanism (3) comprises a servo motor (31), the servo motor (31) is installed on the top plate (53), an output shaft of the servo motor (31) is fixedly connected with a rotating shaft (33), the outer wall of the rotating shaft (33) is fixedly connected with a driving pulley (34), the driving pulley (34) is provided with two groups, the driving pulley (34) is connected with a left driven pulley (36) through belt transmission below, the driving pulley (34) is connected with a right driven pulley (35) through belt transmission above, the inner wall of the left driven pulley (36) is fixedly connected with a first threaded rod (37), the inner wall of the right driven pulley (35) is fixedly connected with a second threaded rod (38), the outer walls of the first threaded rod (37) and the second threaded rod (38) are respectively in threaded connection with a power nut (393), and the power nut (393) is installed on the lifting plate (39) through a bolt, and a guide sleeve (394) is arranged on the lifting plate (39).

2. The cold extrusion forming equipment for the micro gear of the speed reducer as claimed in claim 1, wherein a spring plate (71) is welded to the bottom end of the first buffer spring (7), and the spring plate (71) is fixedly connected with the bottom plate (51) through a bolt.

3. The cold extrusion forming equipment for the micro gear of the speed reducer as recited in claim 2, wherein a groove is formed in the bottom plate (51), and the first buffer spring (7) is located in the groove.

4. The cold extrusion forming device for the micro gears of the speed reducer as recited in claim 1, wherein the bottom end of the supporting block (62) is fixedly connected with the middle die holder (24), and one end of the moving plate (61) far away from the female die (26) is fixedly connected with a sliding block (65).

5. The cold extrusion forming device for the tiny gear of the speed reducer as claimed in claim 4, wherein the middle die holder (24) is provided with a sliding groove (241), and the inner wall of the sliding groove (241) is slidably connected with the sliding block (65).

6. The cold extrusion forming equipment for the micro gears of the speed reducer as claimed in claim 1, wherein the first threaded rod (37) and the second threaded rod (38) are rotatably connected with bearing seats (41) through bearings respectively, the bearing seats (41) are fixedly installed on the bottom plate (51), and the top end of the top plate (53) is provided with a capsule (311) through bolts.

7. The cold extrusion forming equipment for the micro gears of the speed reducer as claimed in claim 1, wherein the bottoms of the two ends of the top plate (53) are fixedly connected with a first fixing plate (531), the top end of the support rod (52) is fixedly connected with a second fixing plate (521), and the first fixing plate (531) and the second fixing plate (521) are fixedly connected through bolts.

8. The cold extrusion forming equipment for the micro gears of the speed reducer is characterized in that the bottom end of the top plate (53) is connected with the guide rod (4) through a bolt, and the bottom end of the guide rod (4) is connected with the bottom plate (51) through a bolt.

9. The cold extrusion forming equipment for the micro gear of the speed reducer according to claim 1, wherein the lifting plate (39) is provided with a first through hole (392) and a second through hole (391), the guide sleeve (394) is installed in the first through hole (392), the power nut (393) is installed in the second through hole (391), the top end of the first support plate (13) is welded with the groove plate (30), the groove plate (30) is provided with an internal threaded hole (302) and a rectangular groove (301), the inner wall of the rectangular groove (301) is inserted with the lifting plate (39), and the groove plate (30) and the lifting plate (39) are fixed through bolts.

10. A cold extrusion forming device and a process for a micro gear of a speed reducer are characterized by comprising the following steps:

s1, sawing the raw material into sections according to the process design requirements, spraying a lubricant, and drying the lubricant;

s2, heating the blank in a medium-frequency induction heating furnace with protective atmosphere to 1200-1250 ℃, and warm forging the blank on a press to form a pre-forged blank;

s3, spheroidizing annealing the pre-forged blank, then shot blasting, and then carrying out phosphorization and saponification treatment on the surface; the spheroidizing annealing temperature is 750-800 ℃ for 200 minutes, then the spheroidizing annealing is rapidly cooled to 600-650 ℃ by strong wind, and the isothermal treatment is carried out in a tempering furnace at 600-650 ℃ for 100 minutes.

S4, the pre-forged blank is placed in the female die (26), the servo motor (31) is started, the output shaft of the servo motor (31) drives the first threaded rod (37) and the second threaded rod (38) to rotate through the driving belt pulley (34), the right driven belt pulley (35) and the left driven belt pulley (36), and the lifting plate (39) is driven to descend under the action of the power nut (393).

S5, when the punch (12) contacts the die (26), the supporting block (62) descends along with the die (26), the supporting block (62) compresses the second buffer spring (64), so that the punch (12) and the die (26) are in flexible contact when just in contact, and the first buffer spring (7) is compressed;

s6, after the extrusion is finished, the servo motor (31) rotates reversely, so that the lifting plate (39) is driven to move upwards, the first buffer spring (7) recovers deformation, and the extruded workpiece in the female die (26) is ejected out.

Technical Field

The invention relates to the technical field of gear cold extrusion forming, in particular to a reducer micro gear cold extrusion forming device and a process thereof.

Background

Cold extrusion is an important component in the precision plastic volume forming technology, and the cold extrusion refers to that a metal blank is placed into a die cavity of a die in a cold state, and metal is forced to be extruded out of the die cavity under the action of strong pressure and a certain speed, so that an extrusion piece with a required shape, size and certain mechanical property is obtained; obviously, the cold extrusion processing is to control the metal flow by a die and form parts by mass transfer of metal volume, and the cold extrusion technology is an advanced production process technology with high precision, high efficiency, high quality and low consumption, and is more applied to the large-scale production of small and medium-sized forgings; compared with the hot forging and warm forging process, the method can save 30-50% of materials and 40-80% of energy, and can improve the quality of the forged piece and improve the operating environment.

The existing gear cold extrusion forming equipment has the defects that a male die does not stably move downwards, so that the quality precision of the processed gear is insufficient, and the male die and a female die are in rigid contact when in initial contact without buffering, so that the quality of the processed gear is further unstable.

Disclosure of Invention

The invention provides a device for cold extrusion forming of a micro gear of a speed reducer and a process thereof.

Therefore, the invention aims to provide cold extrusion forming equipment and a process for a micro gear of a speed reducer, wherein a driving mechanism drives a male die to stably descend, the stability of the male die is further enhanced through a guide rod, the male die and the female die are firstly in flexible contact and then in rigid contact through a buffer assembly, and the buffer is effectively carried out, so that the quality of the processed gear is good, the precision is high, and the problems that the male die is unstable in downward movement, the quality precision of the processed gear is insufficient, the male die and the female die are in rigid contact when in contact, the buffer is not carried out, and the quality of the processed gear is further unstable in the existing cold extrusion forming equipment for the gear are solved.

To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:

the cold extrusion forming equipment for the micro gear of the speed reducer comprises a supporting assembly, wherein the supporting assembly comprises a bottom plate, two ends of the bottom plate are fixedly connected with supporting rods, one ends of the supporting rods, far away from the bottom plate, are detachably connected with a top plate, a driving mechanism is fixedly arranged on the supporting assembly, an upper die assembly is arranged on the driving mechanism, and a lower die assembly is arranged on the supporting assembly;

the upper die assembly comprises a first supporting plate, the bottom end of the first supporting plate is fixedly connected with an upper die base, and the bottom end of the upper die base is fixedly connected with a male die;

the lower die assembly comprises a supporting seat, the top end of the supporting seat is fixedly connected with an outer sleeve seat, a base plate and a middle die seat are sleeved in the outer sleeve seat, a female die is arranged in an inner cavity of the middle die seat, the middle die seat and the female die are connected in a sliding mode through a buffer assembly, the outer wall of the bottom end of the female die is connected with a sleeve seat in a sliding mode, the bottom end of the sleeve seat is fixedly connected with the middle die seat, the inner wall of the bottom end of the middle die seat is connected with a top column in a sliding mode, the bottom end of the top column is fixedly connected with a first buffer spring, and the bottom end of the supporting seat is fixedly connected with the bottom plate;

the buffer assembly comprises a moving plate, the inner wall of the moving plate is connected with a stabilizer bar in a sliding mode, the top end of the stabilizer bar is fixedly connected with a supporting block, the outer wall of the stabilizer bar is sleeved with a second buffer spring, and the second buffer spring is located below the moving plate;

actuating mechanism includes servo motor, servo motor installs on the roof, servo motor's output shaft fixed connection pivot, pivot outer wall fixed connection drive pulley, drive pulley is equipped with two sets ofly, the below left driven pulley is connected through belt drive to the drive pulley, the top right driven pulley is connected through belt drive to the drive pulley, the first threaded rod of left driven pulley inner wall fixed connection, right driven pulley inner wall fixed connection second threaded rod, first threaded rod and second threaded rod outer wall threaded connection power nut respectively, power nut passes through the bolt and installs on the lifter plate, install the guide pin bushing on the lifter plate.

As a preferred scheme of the cold extrusion molding equipment for the micro gear of the speed reducer, the invention comprises the following steps: the bottom end of the first buffer spring is connected with a spring plate in a welding mode, and the spring plate is fixedly connected with the bottom plate through bolts.

As a preferred scheme of the cold extrusion molding equipment for the micro gear of the speed reducer, the invention comprises the following steps: a groove is formed in the bottom plate, and the first buffer spring is located in the groove.

As a preferred scheme of the cold extrusion molding equipment for the micro gear of the speed reducer, the invention comprises the following steps: the bottom end of the supporting block is fixedly connected with the middle die holder, and one end, far away from the female die, of the movable plate is fixedly connected with the sliding block.

As a preferred scheme of the cold extrusion molding equipment for the micro gear of the speed reducer, the invention comprises the following steps: a sliding groove is formed in the middle die base, and the inner wall of the sliding groove is connected with the sliding block in a sliding mode.

As a preferred scheme of the cold extrusion molding equipment for the micro gear of the speed reducer, the invention comprises the following steps: first threaded rod and second threaded rod are equallyd divide and are do not rotated through the bearing and connect the bearing frame, bearing frame fixed mounting be in on the bottom plate, the capsule is installed through the bolt in roof top.

As a preferred scheme of the cold extrusion molding equipment for the micro gear of the speed reducer, the invention comprises the following steps: the bottom parts of the two ends of the top plate are fixedly connected with a first fixing plate, the top end of the supporting rod is fixedly connected with a second fixing plate, and the first fixing plate and the second fixing plate are fixedly connected through bolts.

As a preferred scheme of the cold extrusion molding equipment for the micro gear of the speed reducer, the invention comprises the following steps: the bottom end of the top plate is connected with a guide rod through a bolt, and the bottom end of the guide rod is connected with the bottom plate through a bolt.

As a preferred scheme of the cold extrusion molding equipment for the micro gear of the speed reducer, the invention comprises the following steps: the lifting plate is provided with a first through hole and a second through hole, the guide sleeve is installed in the first through hole, the power nut is installed in the second through hole, the top end of the first supporting plate is welded with the groove plate, the groove plate is provided with an inner threaded hole and a rectangular groove, the inner wall of the rectangular groove is connected with the lifting plate in an inserting mode, and the groove plate and the lifting plate are fixed through bolts.

A cold extrusion forming process for a micro gear of a speed reducer specifically comprises the following steps:

s1, sawing the raw material into sections according to the process design requirements, spraying a lubricant, and drying the lubricant;

s2, heating the blank in a medium-frequency induction heating furnace with protective atmosphere to 1200-1250 ℃, and warm forging the blank on a press to form a pre-forged blank;

s3, spheroidizing annealing the pre-forged blank, then shot blasting, and then carrying out phosphorization and saponification treatment on the surface; the spheroidizing annealing temperature is 750-800 ℃ for 200 minutes, then the spheroidizing annealing is rapidly cooled to 600-650 ℃ by strong wind, and the isothermal treatment is carried out in a tempering furnace at 600-650 ℃ for 100 minutes.

S4, the pre-forging blank is placed into the female die, the servo motor is started, an output shaft of the servo motor drives the first threaded rod and the second threaded rod to rotate through the driving belt pulley, the right driven belt pulley and the left driven belt pulley, and the lifting plate is driven to descend under the action of the power nut.

S5, when the male die contacts the female die, the supporting block descends along with the female die, the supporting block compresses the second buffer spring, so that the male die and the female die are in flexible contact when just contacted, and the first buffer spring is compressed;

and S6, after the extrusion is finished, the servo motor rotates reversely, so that the lifting plate is driven to move upwards, the first buffer spring recovers deformation, and the extruded workpiece in the female die is ejected.

Compared with the prior art:

1. the driving mechanism is arranged to drive the upper die assembly to descend, so that the male die in the upper die assembly can stably descend, and the machining precision is high and the machining quality is good;

2. through setting up the buffering subassembly, cushion when terrace die and die contact for be the flexible contact when terrace die and the contact of die just contact, turn into rigid contact again, thereby make the processingquality of work piece good, the rejection rate is low.

Drawings

FIG. 1 is a schematic structural view provided by the present invention;

FIG. 2 is a schematic view of the internal structure of FIG. 1 according to the present invention;

FIG. 3 is an enlarged view of a mold assembly provided by the present invention;

FIG. 4 is an enlarged view taken at A in FIG. 3 according to the present invention;

FIG. 5 is a top view of a lifter plate provided with the present invention;

FIG. 6 is an enlarged view at B of FIG. 5 in accordance with the present invention;

fig. 7 is a top view of a slot plate provided by the present invention.

In the figure: the device comprises an upper die assembly 1, an upper die seat 11, a male die 12, a first supporting plate 13, a lower die assembly 2, a supporting seat 21, a backing plate 22, an outer sleeve seat 23, a middle die seat 24, a sliding groove 241, a cylinder seat 25, a female die 26, a top pillar 27, a driving mechanism 3, a groove plate 30, a rectangular groove 301, an internal threaded hole 302, a servo motor 31, a capsule 311, a rotating shaft 33, a driving pulley 34, a right driven pulley 35, a left driven pulley 36, a first threaded rod 37, a second threaded rod 38, a lifting plate 39, a second through hole 391, a first through hole 392, a power nut 393, a guide sleeve 394, a guide rod 4, a supporting assembly 5, a bottom plate 51, a supporting rod 52, a second fixing plate 521, a top plate 53, a first fixing plate 531, a buffering assembly 6, a stabilizing rod 61, a supporting block 62, a 63, a second buffering spring 64, a sliding block 65, a first buffering spring 7 and a spring plate 71.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The invention provides a cold extrusion forming device for a miniature gear of a speed reducer, and please refer to fig. 1-7, the cold extrusion forming device comprises a supporting component 5, the supporting component 5 comprises a bottom plate 51, two ends of the bottom plate 51 are fixedly connected with supporting rods 52, one end of each supporting rod 52 far away from the bottom plate 51 is detachably connected with a top plate 53, a driving mechanism 3 is fixedly arranged on the supporting component 5, an upper die component 1 is arranged on the driving mechanism 3, and a lower die component 2 is arranged on the supporting component 5;

the upper die assembly 1 comprises a first supporting plate 13, the bottom end of the first supporting plate 13 is fixedly connected with an upper die holder 11, and the bottom end of the upper die holder 11 is fixedly connected with a male die 12;

the lower die assembly 2 comprises a supporting seat 21, the top end of the supporting seat 21 is fixedly connected with an outer sleeve seat 23, a base plate 22 and a middle die seat 24 are sleeved inside the outer sleeve seat 23, a female die 26 is arranged in an inner cavity of the middle die seat 24, the middle die seat 24 and the female die 26 are connected in a sliding mode through a buffer assembly 6, the outer wall of the bottom end of the female die 26 is connected with a sleeve seat 25 in a sliding mode, the bottom end of the sleeve seat 25 is fixedly connected with the middle die seat 24, the inner wall of the bottom end of the middle die seat 24 is connected with a top column 27 in a sliding mode, the bottom end of the top column 27 is fixedly connected with a first buffer spring 7, and the bottom end of the supporting seat 21 is fixedly connected with a bottom plate 51;

the buffer assembly 6 comprises a moving plate 61, the inner wall of the moving plate 61 is connected with a stabilizer bar 63 in a sliding manner, the top end of the stabilizer bar 63 is fixedly connected with a supporting block 62, the outer wall of the stabilizer bar 63 is sleeved with a second buffer spring 64, and the second buffer spring 64 is positioned below the moving plate 61; the buffer assembly 6 is used for realizing the buffer of the upper die assembly 1 in base contact with the lower die assembly 2, so that the contact is flexible;

the driving mechanism 3 comprises a servo motor 31, the servo motor 31 is mounted on the top plate 53, an output shaft of the servo motor 31 is fixedly connected with a rotating shaft 33, the outer wall of the rotating shaft 33 is fixedly connected with a driving pulley 34, two groups of driving pulleys 34 are arranged, the driving pulley 34 below is connected with a left driven pulley 36 through belt transmission, the driving pulley 34 above is connected with a right driven pulley 35 through belt transmission, the inner wall of the left driven pulley 36 is fixedly connected with a first threaded rod 37, the inner wall of the right driven pulley 35 is fixedly connected with a second threaded rod 38, the outer walls of the first threaded rod 37 and the second threaded rod 38 are respectively in threaded connection with a power nut 393, the power nut 393 is mounted on a lifting plate 39 through bolts, and a guide sleeve 394 is mounted on the lifting plate 39; the servo motor 31 is used for driving the first threaded rod 37 and the second threaded rod 38 to rotate, so as to drive the lifting plate 39 to lift;

further, the bottom end of the first buffer spring 7 is welded and connected with a spring plate 71, and the spring plate 71 is fixedly connected with the bottom plate 51 through bolts; the first buffer spring 7 acts to lift the top pillar 27 and thus to lift the work piece out of the die 26.

Further, a groove is formed in the bottom plate 51, and the first buffer spring 7 is located in the groove; the function of the groove is to maintain the stability of the first buffer spring 7.

Further, the bottom end of the supporting block 62 is fixedly connected with the middle die holder 24, and one end of the moving plate 61, which is far away from the female die 26, is fixedly connected with a slider 65; the support block 62 functions to fix the stabilizer bar 63.

Further, a sliding groove 241 is formed in the middle die holder 24, and the inner wall of the sliding groove 241 is connected with the sliding block 65 in a sliding manner; so that the female die 26 can be stably lowered when the male die 12 is lowered to contact the female die 26.

Further, the first threaded rod 37 and the second threaded rod 38 are rotatably connected with a bearing seat 41 through bearings, the bearing seat 41 is fixedly installed on the bottom plate 51, and the top end of the top plate 53 is provided with a capsule 311 through bolts; the capsule 311 serves to enclose some of the components of the drive mechanism 3.

Further, the bottoms of the two ends of the top plate 53 are fixedly connected with a first fixing plate 531, the top end of the support rod 52 is fixedly connected with a second fixing plate 521, and the first fixing plate 531 and the second fixing plate 521 are fixedly connected through bolts; the first fixing plate 531 and the second fixing plate 521 are used to detachably connect the top plate 53 and the support rod 52, thereby facilitating the detachment and installation.

Further, the bottom end of the top plate 53 is connected with a guide rod 4 through a bolt, and the bottom end of the guide rod 4 is connected with the bottom plate 51 through a bolt; the guide rod 4 is used for guiding the upper die.

Further, a first through hole 392 and a second through hole 391 are formed in the lifting plate 39, the guide sleeve 394 is installed in the first through hole 392, the power nut 393 is installed in the second through hole 391, the top end of the first support plate 13 is welded with the groove plate 30, the groove plate 30 is provided with an internal thread hole 302 and a rectangular groove 301, the lifting plate 39 is inserted into the inner wall of the rectangular groove 301, and the groove plate 30 and the lifting plate 39 are fixed through bolts; the power nut 393 is mounted to the lifter plate 39 so as to be easily replaced when the threads of the inner wall of the lifter plate 39 are damaged.

A cold extrusion forming process for a micro gear of a speed reducer specifically comprises the following steps:

s1, sawing the raw material into sections according to the process design requirements, spraying a lubricant, and drying the lubricant;

s2, heating the blank in a medium-frequency induction heating furnace with protective atmosphere to 1200-1250 ℃, and warm forging the blank on a press to form a pre-forged blank;

s3, spheroidizing annealing the pre-forged blank, then shot blasting, and then carrying out phosphorization and saponification treatment on the surface; the spheroidizing annealing temperature is 750-800 ℃ for 200 minutes, then the spheroidizing annealing is rapidly cooled to 600-650 ℃ by strong wind, and the isothermal treatment is carried out in a tempering furnace at 600-650 ℃ for 100 minutes.

S4, the pre-forged blank is placed in the female die 26, the servo motor 31 is started, the output shaft of the servo motor 31 drives the first threaded rod 37 and the second threaded rod 38 to rotate through the driving belt pulley 34, the right driven belt pulley 35 and the left driven belt pulley 36, and the lifting plate 39 is driven to descend under the action of the power nut 393.

S5, when the punch 12 contacts the die 26, the supporting block 62 descends along with the die 26, the supporting block 62 compresses the second buffer spring 64, so that the punch 12 and the die 26 are in flexible contact when just contacting, and the first buffer spring 7 is compressed;

and S6, after the extrusion is finished, the servo motor 31 rotates reversely, so that the lifting plate 39 is driven to move upwards, the first buffer spring 7 recovers deformation, and the extruded workpiece in the female die 26 is ejected.

While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination, provided that no structural conflict exists, and the combinations are not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.