Trimming die for engine balance shaft

Abstract

The invention discloses a trimming die for an engine balance shaft, which comprises a rack, a pre-cutting assembly, a trimming assembly and a trimming assembly, the pre-cutting assembly comprises a pre-cutting seat and a pre-cutting punch, the pre-cutting seat is provided with a lower positioning cavity, the pre-cutting punch is provided with a rough cutting edge, and the top surface of the pre-cutting punch is provided with an upper positioning cavity; the final cutting assembly comprises a rotary supporting assembly and a final cutting punch, the rotary supporting assembly is used for supporting the blank and driving the blank to rotate around the axis of the blank, the final cutting punch is provided with a fine cutting blade, and a final cutting positioning cavity is formed in the top face of the final cutting punch; and the die assembling assembly is used for driving the pre-cutting punch and the final-cutting punch to move between the die splitting station and the die assembling station. According to the trimming die for the engine balance shaft, after flashes generated at the splitting and combining position of the die during shaping of a blank are cut off through the pre-cutting assembly, the blank is supported through the rotary supporting assembly, and the final cutting punch presses the blank downwards, so that a fine cutting blade acts on the blank and is matched with the rotary supporting assembly to drive the blank to rotate; burr cutting of a blank balance block and other parts is achieved, and then the machining precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of trimming of engine balancing shafts, in particular to a trimming die for engine balancing shafts. Background Art

[0002] The engine balance shaft is an important component in the automobile engine. It installs an eccentric weight on the rotating shaft and utilizes the reverse vibration force generated by the eccentric weight when it rotates with the rotating shaft to achieve a good balance effect for the engine, thereby reducing engine vibration. Therefore, the engine balance shaft is of great significance for improving the balance of the engine, reducing vibration and noise, and improving driving comfort.

[0003] In the production process of engine balance shaft, the blank is usually forged by a forging die, and then the flash and burrs on the blank are cut off by a trimming die. The flash is mainly concentrated at the separation and combination position of the forging die. In the die design process, in order to ensure the smooth flow of the blank, the corresponding cavity of the balance block of the blank is usually rounded. As a result, during the forging process, the gap in the mold cavity of the mold balance block is prone to increased wear due to improper gap design. When the metal blank is subjected to pressure, a filling effect is easily generated in the gap to form burrs. That is, after the blank is forged, more burrs are easily generated at the balance block part. The existing trimming die has a limited range of action and can only cut off the burrs and flash at the separation and combination of the die. It is difficult to process the burrs at the balance block and other parts, which ultimately affects the molding quality of the product.

[0004] Therefore, it is necessary to improve the trimming die of the engine balance shaft in the prior art. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects in the prior art and provide a trimming die for an engine balance shaft with improved processing quality.

[0006] In order to achieve the above technical effects, the technical solution of the present invention is: a trimming die for an engine balance shaft, comprising: frame: A pre-cutting assembly, the pre-cutting assembly comprising a pre-cutting seat arranged on the frame and a pre-cutting punch located directly above the pre-cutting seat, the top surface of the pre-cutting seat is provided with a positioning lower cavity, the pre-cutting punch has a rough cutting blade for cutting off the flash of the blank and the top surface is provided with a positioning upper cavity; A final cutting assembly, the final cutting assembly includes a rotating support assembly and a final cutting punch arranged directly above the rotating support assembly, the rotating support assembly is used to support the blank and drive the blank to rotate around its own axis, the final cutting punch has a fine cutting blade for cutting off the blank burrs and a final cutting positioning cavity is arranged on the top surface, the shape of the fine cutting blade is the same as the shape of the rough cutting blade and the cutting edge precision of the fine cutting blade is higher than the cutting edge precision of the rough cutting blade, and the shape and size of the positioning upper cavity are the same as the shape and size of the final cutting positioning cavity; A mold clamping assembly, the mold clamping assembly is used to drive the pre-cutting punch and the final cutting punch to move between the mold separation station and the mold clamping station along the vertical direction; At the mold clamping station, the positioning lower cavity and the positioning upper cavity cooperate with each other to form a positioning cavity for positioning the blank, and the rotating support assembly and the fine cutting blade are respectively fitted with the lower part and the upper part of the blank in a flat state; Under the mold splitting station, gaps for storing and accessing blanks are arranged between the pre-cutting seat and the pre-cutting punch, and between the rotating support assembly and the rough cutting blade.

[0007] Preferably, in order to achieve support and rotation of the blank, the rotating support assembly includes a bracket, a rotating unit, a driving roller and two driven rollers, the bracket is fixed on the frame, the axial directions of the driving roller and the two driven rollers are horizontal and parallel, the driving roller and the two driven rollers both rotate around their own axis lines on the bracket, the rotating unit drives the driving roller to rotate, the two driven rollers are distributed side by side in a horizontal direction perpendicular to their own axis directions, and the driving roller is connected to the two driven rollers by transmission.

[0008] Preferably, in order to ensure close contact between the driven roller and the blank and the active roller and to ensure a stable rotation support rotation effect, the two driven rollers are rotatably connected to a sliding seat, and the sliding seat slides on the bracket in a vertical direction.

[0009] Preferably, in order to control the rotation of the active roller, the rotating unit includes a rotating motor, a driving wheel, a synchronous belt and a driven wheel. The rotating motor is fixed on the frame and is drivingly connected to the driving wheel. The driving wheel is transmission-connected to the driven wheel through the synchronous belt. The driven wheel is radially fixedly connected to the active roller coaxially.

[0010] Preferably, in order to support the end of the blank, thereby ensuring stable support for the blank when cutting off the balance block and other burrs on the blank, ensuring that its axis is horizontal and avoiding offset vibration, end support assemblies are also provided at both ends of the rotating support assembly, and the end support assemblies are used to support the end of the blank. The end support assembly includes a support groove, the support groove is a support groove with the groove facing upward and the length direction parallel to the axial direction of the active roller, and the cross-section of the inner wall of the support groove is a semicircular arc.

[0011] Preferably, in order to reduce the friction force on the blank during rotation, support rollers that rotate around their own axis are distributed in a circular array on the inner wall of the support groove, the axial direction of the support rollers is consistent with the length direction of the support groove, and the roller surface of the support rollers protrudes from the arc surface where the inner wall of the support groove is located.

[0012] Preferably, in order to ensure that the driven roller and the supporting roller can support the blank at the same time, the support groove slides on the frame in the vertical direction and an elastic member is provided between the support groove and the frame, and the elastic member is used to tend to cause the support groove to move upward.

[0013] Preferably, in order to facilitate the axial positioning of the blank, prevent axial deviation, and improve the accuracy of removing burrs and flash, the end support assembly also includes a positioning plate fixed to the side of the support groove away from the rotating support assembly.

[0014] Preferably, in order to reduce the friction force on the end of the blank when it rotates, balls that rotate around their own sphere centers are distributed in a circular array on the positioning plate, the centerline of the circular array of balls coincides with the centerline of the inner wall of the support groove and the balls are located on the inner side of the extended curved surface of the inner wall of the support groove, and the outer surface of the balls protrudes from the side of the positioning plate adjacent to the support groove to locate the axial position of the blank.

[0015] Preferably, in order to facilitate maintenance and replacement of the pre-cutting punch and the final-cutting punch, the pre-cutting punch and the final-cutting punch are both detachably connected to the output end of the clamping assembly.

[0016] To summarize, compared with the prior art, the trimming die of the engine balance shaft of the present invention uses a pre-cutting component to cut off the flash generated at the mold separation and combination point during the shaping of the blank, and then supports the blank through a rotating support component. The final cutting punch presses down on the blank so that the fine cutting blade acts on the blank, and cooperates with the rotating support component to drive the blank to rotate, thereby achieving burr removal on the blank balance block and other parts, thereby improving the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Explosion diagram of Figure 3 yes Figure 1 A front view of Figure 4 It is a partial structural schematic diagram of the present invention; Figure 5 yes Figure 4 A top view of Figure 6 It is a structural schematic diagram of the mold clamping assembly of the present invention; Figure 7 It is a structural schematic diagram of the mold clamping assembly of the present invention from another perspective; Figure 8 yes Figure 6 Explosion diagram of Fig. 9 It is a structural schematic diagram of the rotary support assembly of the present invention; Fig.10 yes Fig. 9 Explosion diagram of Fig.11 is a schematic structural diagram of the end support assembly of the present invention; Fig.12 yes Fig.11 Explosion diagram of Fig.13 It is a structural schematic diagram of the positioning plate of the present invention; In the figure: 1, frame; 11, base; 12, fixed frame; 2, pre-cut assembly; 21, pre-cut seat; 211, positioning lower cavity; 22, pre-cut punch; 221, positioning upper cavity; 222, rough cutting blade; 3, rotating support assembly; 31, bracket; 311, slide; 32, rotating unit; 321, rotating motor; 322, driving wheel; 323, synchronous belt; 324, driven wheel; 33, driving roller; 34, driven roller; 35, sliding seat; 4, final cutting punch; 41, final cutting positioning cavity; 42, fine cutting blade; 5, clamping assembly; 51, hydraulic cylinder; 52, lifting plate; 53, guide rod; 54, bolt; 6, end support assembly; 61, support groove; 62, support roller; 63, positioning plate; 631, support frame; 64, ball; 65, elastic member; 66, fixed seat; 67, flat plate; 68, guide rod; 69, limit block; 7, blank. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] like Figure 1-Figure 13 As shown, a trimming die for an engine balance shaft of the present invention comprises: Rack 1: The pre-cutting assembly 2 comprises a pre-cutting seat 21 arranged on the frame 1 and a pre-cutting punch 22 located directly above the pre-cutting seat 21, the top surface of the pre-cutting seat 21 is provided with a positioning lower cavity 211, the pre-cutting punch 22 has a rough cutting blade 222 for cutting off the flash of the blank 7 and the top surface is provided with a positioning upper cavity 221; The final cutting assembly includes a rotating support assembly 3 and a final cutting punch 4 arranged directly above the rotating support assembly 3. The rotating support assembly 3 is used to support the blank 7 and drive the blank 7 to rotate around its own axis. The final cutting punch 4 has a fine cutting blade 42 for cutting off burrs of the blank 7 and a final cutting positioning cavity 41 is arranged on the top surface. The shape of the fine cutting blade 42 is the same as that of the rough cutting blade 222 and the cutting edge precision of the fine cutting blade 42 is higher than that of the rough cutting blade 222. The shape and size of the positioning upper cavity 221 are the same as those of the final cutting positioning cavity 41. The mold clamping assembly 5 is used to drive the pre-cutting punch 22 and the final cutting punch 4 to move between the mold separation station and the mold clamping station along the vertical direction; At the mold clamping station, the lower positioning cavity 211 and the upper positioning cavity 221 cooperate with each other to form a positioning cavity for positioning the blank 7, and the rotating support assembly 3 and the fine cutting blade 42 are respectively fitted with the lower and upper parts of the blank 7 in a flat state; At the mold splitting station, gaps for storing and accessing the blank 7 are provided between the pre-cutting seat 21 and the pre-cutting punch 22 , and between the rotating support assembly 3 and the rough cutting blade 222 .

[0020] When the mold is used, the mold clamping assembly 5 adjusts the pre-cutting punch 22 to the mold separation station, and places the blank 7 to be trimmed in the positioning lower cavity 211 of the pre-cut seat 21. Then, the mold clamping assembly 5 drives the pre-cutting punch 22 to move downward, so that the rough cutting edge 222 at the bottom of the pre-cutting punch 22 acts on the blank 7, and the flash mainly concentrated at the end mold parting surface during the forging process is cut off. Then, the mold clamping assembly 5 adjusts the pre-cutting punch 22 and the final cutting punch 4 to the mold separation station, takes out the blank 7 on the pre-cut seat 21 that has undergone a trimming process, and places the blank 7 on the rotating support assembly 3. Then, the mold clamping assembly 5 moves the final cutting punch 4 downward again, so that the bottom surface of the final cutting punch 4 While the final cutting positioning cavity 41 is in contact with the upper part of the blank 7, the lower part of the blank 7 is in contact with the rotating support assembly 3. At the same time, the fine cutting blade 42 on the final cutting punch 4 is in contact with the upper outer surface of the blank 7, and there is a certain interval between it and the rotating support assembly 3. The contact part between the fine cutting blade 42 and the blank 7 includes the outer periphery of the rotating shaft and the balance block of the blank 7. Then, the rotating support assembly 3 drives the blank 7 to rotate, so that the blank 7 rotates relative to the fine cutting blade 42 at all circumferential positions. The burrs on the balance block and other parts of the blank 7 are cut off by the fine cutting blade 42. Then, the mold clamping assembly 5 raises the final cutting punch 4 to the mold separation position, and then the product with flash and burr removal can be taken out.

[0021] Compared with the prior art, in the present invention, the pre-cut seat 21, the pre-cut punch 22 and the clamping assembly 5 in the pre-cutting assembly 2 cooperate with each other, so that the flash mainly concentrated at the end die parting surface after forging can be cut off, and the rough cutting blade 222 is used to act on the main concentrated part of the flash of the blank 7 to achieve preliminary processing of the trimming of the blank 7; then, the rotating support assembly 3, the final cutting punch 4 and the clamping assembly 5 in the final cutting assembly cooperate with each other, and the design that the center of the circle where the edge of the axial cross section of the blank 7 is located is located on the same horizontal line, and the rotating support assembly 3 drives the blank 7 to be cut off. The blank 7 rotates, and the wall of the final cutting positioning cavity 41 of the final cutting punch 4 comes into contact with the upper part of the blank 7. While positioning the blank 7, the fine cutting blade 42 acts on the balance block of the blank 7 and the burrs at other places. The blank 7 and the fine cutting blade 42 rotate relative to each other, and the cutting edge accuracy of the fine cutting blade 42 is higher than that of the rough cutting blade 222, thereby ensuring the burr removal accuracy. In addition, since the rough cutting blade 222 has already removed a large amount of burrs, the fine cutting blade 42 is prevented from contacting the burrs when removing the burrs, thereby ensuring the service life of the fine cutting blade 42 and avoiding excessive wear thereof.

[0022] A further improvement is that both the pre-cutting punch 22 and the final-cutting punch 4 are detachably connected to the output end of the clamping assembly 5 .

[0023] This design facilitates the disassembly and connection of the pre-cutting punch 22 and the final-cutting punch 4, and facilitates corresponding maintenance operations after the two are disassembled, or corresponding replacement as needed.

[0024] Specifically, in the present invention, the frame 1 includes a horizontal rectangular plate-shaped base 11 , an inverted U-shaped fixing frame 12 is arranged above the base 11 , and two ends of the fixing frame 12 are fixed to the top surface of the base 11 .

[0025] The mold clamping assembly 5 includes a hydraulic cylinder 51, a lifting plate 52, a guide rod 53 and a bolt 54, wherein the cylinder barrel of the hydraulic cylinder 51 is vertically downward and fixed to the top of the fixed frame 12, the piston rod passes through the top of the fixed frame 12 and is fixedly connected to the horizontal lifting plate 52, the guide rod 53 is fixed above the lifting plate 52 and slides in the vertical direction to pass through the top of the fixed frame 12, and the pre-cutting punch 22 and the final cutting punch 4 are detachably connected to the two sides below the lifting plate 52 by two sets of bolts 54 respectively.

[0026] After adopting the above structure, it is not only convenient to quickly and easily disassemble and connect the pre-cutting punch 22 and the final cutting punch 4, but also after the hydraulic cylinder 51 is actuated, under the sliding cooperation of the fixed frame 12 and the guide rod 53, the lifting plate 52 can simultaneously drive the pre-cutting punch 22 and the final cutting punch 4 to slide stably between the mold closing position and the mold opening position along the vertical direction, ensuring that the positioning upper cavity 221 in the pre-cutting punch 22 faces the positioning lower cavity 211 of the pre-cutting seat 21, and at the same time, the final cutting positioning cavity 41 of the final cutting punch 4 faces the rotating support assembly 3.

[0027] A further improvement is that the rotating support assembly 3 includes a bracket 31, a rotating unit 32, a driving roller 33 and two driven rollers 34, the bracket 31 is fixed on the frame 1, the axes of the driving roller 33 and the two driven rollers 34 are horizontal and parallel, the driving roller 33 and the two driven rollers 34 both rotate around their own axis lines on the bracket 31, the rotating unit 32 drives the driving roller 33 to rotate, the two driven rollers 34 are distributed side by side in a horizontal direction perpendicular to their own axes, and the driving roller 33 is connected to the two driven rollers 34 in a transmission manner.

[0028] After adopting the above structure, the bracket 31 is used to support the active roller 33 and the two driven rollers 34. When supporting the blank 7, the two driven rollers 34 are respectively in contact with the two sides below the rotating shaft of the blank 7 to achieve stable support for the blank 7. When it is necessary to drive the blank 7 to rotate, the rotating unit 32 is started and acts on the active roller 33, thereby driving the active roller 33 to rotate. The active roller 33 is connected to the two driven rollers 34 through transmission, and then drives the two driven rollers 34 to rotate around their own axis, so that the blank 7 on the two driven rollers 34 rotates, which makes it easier for the fine cutting blade 42 to contact the burrs on the blank 7, thereby removing the burrs.

[0029] A further improvement is that the two driven rollers 34 are both rotatably connected to a sliding seat 35, and the sliding seat 35 slides on the bracket 31 along the vertical direction; the rotating unit 32 includes a rotating motor 321, a driving wheel 322, a synchronous belt 323 and a driven wheel 324, the rotating motor 321 is fixed on the frame 1 and is drivingly connected to the driving wheel 322, the driving wheel is transmission-connected to the driven wheel 324 through the synchronous belt 323, and the driven wheel 324 is radially fixedly connected to the driving roller 33 coaxially.

[0030] Specifically, vertical brackets 31 are provided at both ends of the active roller 33, the brackets 31 are fixed above the base 11, and two slides 311 distributed side by side in the horizontal direction are provided on the top of the brackets 31, the slides 311 extend in the vertical direction, and a sliding seat 35 is slidably connected to the inner side of the slides 311, and the driven roller 34 is rotatably connected to the sliding seat 35; the active roller 33 rotates between the two brackets 31.

[0031] In the rotating unit 32 , the rotating motor 321 is fixed on the base 11 and the output end is fixedly connected to the driving wheel 322 coaxially. The driving wheel 322 is connected to the driven wheel 324 through a synchronous belt 323 . The driven wheel 324 is fixedly connected to the driving roller 33 coaxially.

[0032] After adopting the above structure, the height position of the driven roller 34 can be changed conveniently through the sliding cooperation of the sliding mouth 311 and the sliding seat 35, so that after the blank 7 is placed on the driven roller 34, the driven roller 34 is subjected to the pressure of the blank 7, and under the sliding cooperation of the sliding seat 35 and the sliding mouth 311, the driven roller 34 is lowered from the frame, and the roller surface of the driven roller 34 can maintain good contact with the rotating shaft of the blank 7 and the active roller 33, ensuring the operation of the rotating unit 32. After driving the active roller 33 to rotate, the driven roller 34 can drive the blank 7 to rotate around its own axis.

[0033] When it is necessary to drive the blank 7 to rotate, the rotating motor 321 is started to drive the driving wheel 322 to rotate. The driving wheel 322 acts on the driven wheel 324 through the synchronous belt 323, so that the driven wheel 324 rotates, and then drives the active roller 33 to rotate synchronously, so that the active roller 33 can drive the blank 7 above to rotate through the driven roller 34.

[0034] A further improvement is that end support assemblies 6 are also provided at both ends of the rotating support assembly 3, and the end support assemblies 6 are used to support the ends of the blank 7. The end support assembly 6 includes a support groove 61, and the support groove 61 is a support groove 61 with the groove opening facing upward and the length direction parallel to the axial direction of the active roller 33, and the cross-section of the inner wall of the support groove 61 is a semicircular arc.

[0035] Specifically, the distance between the two end support assemblies 6 is slightly smaller than the length of the blank 7, and the rotating support assembly 3 is located at the center position of the two end support assemblies 6. In this way, the two ends of the blank 7 can be supported by the two end support assemblies 6, and the middle part of the blank 7 can be supported by the rotating support assembly 3, thereby ensuring a good supporting effect on the blank 7 and ensuring that the blank 7 remains in a horizontal state during rotation under the mutual cooperation of the two.

[0036] A further improvement is that a ring array of support rollers 62 rotating around their own axis is distributed on the inner wall of the support groove 61, the axial direction of the support rollers 62 is consistent with the length direction of the support groove 61, and the roller surface of the support rollers 62 protrudes from the arc surface where the inner wall of the support groove 61 is located.

[0037] After adopting the above structure, the outer periphery of the end of the blank 7 is supported by the annularly distributed support rollers 62, and the support rollers 62 can rotate around their own axis, thereby avoiding direct contact between the end of the blank 7 and the inner wall of the support groove 61. The end of the blank 7 is supported by the rotatable support rollers 62, which reduces the friction force on the blank 7 during rotation, facilitates the rapid rotation of the blank 7, and during the rotation process, the burrs on the surface of the blank 7 are removed by the fine cutting blade 42 of the final cutting punch 4.

[0038] A further improvement is that the support groove 61 slides on the frame 1 along the vertical direction and an elastic member 65 is provided between the support groove 61 and the frame 1 , and the elastic member 65 is used to tend to cause the support groove 61 to move upward.

[0039] Specifically, Fig.11 and Fig.12 As shown, a flat plate 67 is fixed below the support groove 61, and the elastic member 65 is a compression spring. The top end of the compression spring is connected to the flat plate 67, and the bottom end is connected to a fixed seat 66. The fixed seat 66 is fixed above the base 11. The fixed seat 66 is also provided with a guide rod 68 extending in a vertical direction and slidingly cooperating with the flat plate 67. A limiting block 69 is fixed to the top end of the guide rod 68.

[0040] After using the above structure, when no other force is applied, the elastic force of the compression spring elastic member 65 pushes the plate 67 upward, so that the plate 67 moves upward along the guide rod 68 until it contacts the stop block 69. After the blank 7 is prevented from being held in the support groove 61 of the two end support assemblies 6, the gravity pressure of the blank 7 is received, so that the support groove 61 descends and the elastic member 65 is compressed. When the mold clamping assembly 5 drives the final cutting punch 4 to descend to the mold clamping position, the cavity wall of the final cutting positioning cavity 41 acts on the upper part of the blank 7, and the final cutting punch 4 presses the blank 7 downward, so that the blank 7 continues to drive the support groove 61 to descend, and the two sides of the lower part of the blank 7 are respectively attached to the roller surfaces of the two driven rollers 34, and the sliding seat 35 descends along the sliding opening 311, and finally the two driven rollers 34 are attached and sandwiched between the middle part of the blank 7 and the active roller 33.

[0041] A further improvement is that the end support assembly 6 also includes a positioning plate 63 fixed to the side of the support groove 61 away from the rotating support assembly 3; the positioning plate 63 is provided with a circular array of balls 64 rotating around their own sphere centers, the circular array distribution axis of the balls 64 coincides with the axis of the inner wall of the support groove 61 and the balls 64 are located on the inner side of the extended curved surface of the inner wall of the support groove 61, and the outer surface of the balls 64 protrudes from the side of the positioning plate 63 adjacent to the support groove 61 to locate the axial position of the blank 7.

[0042] Specifically, the positioning plate 63 is vertically arranged and fixed above the flat plate 67 by a support frame 631. The spacing between the circular array of balls 64 on the positioning plate 63 is smaller than the diameter of the end of the blank 7. In this way, the positioning plate 63 is relatively fixedly connected to the support groove 61. After the blank 7 is placed on the two support grooves 61, the balls 64 on the positioning plate 63 contact the end surface of the blank 7, which can achieve axial positioning of the blank 7 and prevent the blank 7 from axial deviation. Moreover, the balls 64 can rotate around their own spherical centers on the positioning plate 63, so that when the blank 7 rotates under the action of the rotating support assembly 3, the balls 64 can reduce the friction between them and the end of the blank 7 through their own rotation, thereby facilitating the rotation of the blank 7.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A trimming die for an engine balance shaft, characterized in that: include: Rack (1): A pre-cutting assembly (2), the pre-cutting assembly (2) comprising a pre-cutting seat (21) arranged on the frame (1) and a pre-cutting punch (22) located directly above the pre-cutting seat (21), the top surface of the pre-cutting seat (21) being provided with a positioning lower cavity (211), the pre-cutting punch (22) having a rough cutting blade (222) for cutting off flash of the blank (7) and a positioning upper cavity (221) being provided on the top surface; A final cutting assembly, the final cutting assembly comprising a rotating support assembly (3) and a final cutting punch (4) arranged directly above the rotating support assembly (3), the rotating support assembly (3) being used to support the blank (7) and drive the blank (7) to rotate around its own axis, the final cutting punch (4) having a fine cutting blade (42) for cutting off burrs of the blank (7) and a final cutting positioning cavity (41) being arranged on the top surface, the shape of the fine cutting blade (42) being the same as the shape of the rough cutting blade (222) and the cutting edge precision of the fine cutting blade (42) being higher than the cutting edge precision of the rough cutting blade (222), and the shape and size of the positioning upper cavity (221) being the same as the shape and size of the final cutting positioning cavity (41); A mold clamping assembly (5), the mold clamping assembly (5) being used to drive the pre-cutting punch (22) and the final cutting punch (4) to move in a vertical direction between a mold splitting station and a mold clamping station; At the mold clamping station, the positioning lower cavity (211) and the positioning upper cavity (221) cooperate with each other to form a positioning cavity for positioning the blank (7), and the rotating support assembly (3) and the fine cutting blade (42) are respectively fitted with the lower part and the upper part of the blank (7) in a flat state; At the mold splitting station, a gap for storing and accessing the blank (7) is provided between the pre-cutting seat (21) and the pre-cutting punch (22), and between the rotating support assembly (3) and the rough cutting blade (222).

2. The trimming die for the engine balance shaft according to claim 1, characterized in that: The rotating support assembly (3) comprises a bracket (31), a rotating unit (32), a driving roller (33) and two driven rollers (34); the bracket (31) is fixed on the frame (1); the axes of the driving roller (33) and the two driven rollers (34) are horizontal and parallel; the driving roller (33) and the two driven rollers (34) rotate on the bracket (31) around their own axes; the rotating unit (32) drives the driving roller (33) to rotate; the two driven rollers (34) are arranged side by side in a horizontal direction perpendicular to their own axes; the driving roller (33) is connected to the two driven rollers (34) by transmission.

3. The trimming die for the engine balance shaft according to claim 2, characterized in that: The two driven rollers (34) are both rotatably connected to a sliding seat (35), and the sliding seat (35) slides on the bracket (31) along a vertical direction.

4. The trimming die for the engine balance shaft according to claim 2, characterized in that: The rotating unit (32) comprises a rotating motor (321), a driving wheel (322), a synchronous belt (323) and a driven wheel (324); the rotating motor (321) is fixed on the frame (1) and drivingly connected to the driving wheel (322); the driving wheel is drivingly connected to the driven wheel (324) via the synchronous belt (323); and the driven wheel (324) is fixedly connected to the driving roller (33) radially on the same axis.

5. The trimming die for the engine balance shaft according to claim 2, characterized in that: End support assemblies (6) are also provided at both ends of the rotating support assembly (3), and the end support assemblies (6) are used to support the ends of the blank (7). The end support assembly (6) comprises a support groove (61), and the support groove (61) is a support groove (61) with the groove opening facing upward and the length direction parallel to the axial direction of the active roller (33), and the cross-section of the inner wall of the support groove (61) is a semicircular arc.

6. The trimming die for the engine balance shaft according to claim 5, characterized in that: Support rollers (62) that rotate around their own axis lines are distributed in an annular array on the inner wall of the support groove (61); the axial direction of the support rollers (62) is consistent with the length direction of the support groove (61); and the roller surfaces of the support rollers (62) protrude from the arc surface where the inner wall of the support groove (61) is located.

7. The trimming die for the engine balance shaft according to claim 5, characterized in that: The support groove (61) slides on the frame (1) along the vertical direction and an elastic member (65) is provided between the support groove and the frame (1), and the elastic member (65) is used to tend to cause the support groove (61) to move upward.

8. The trimming die for the engine balance shaft according to claim 5, characterized in that: The end support assembly (6) further comprises a positioning plate (63) fixed to a side of the support groove (61) away from the rotation support assembly (3).

9. The trimming die for the engine balance shaft according to claim 8, characterized in that: The positioning plate (63) is provided with a circular array of balls (64) that rotate around their own spherical centers. The axis of the circular array distribution of the balls (64) coincides with the axis of the inner wall of the support groove (61), and the balls (64) are located on the inner side of the extended curved surface of the inner wall of the support groove (61). The outer surface of the balls (64) protrudes from a side of the positioning plate (63) adjacent to the support groove (61) to locate the axial position of the blank (7).

10. The trimming die for the engine balance shaft according to any one of claims 1 to 9, characterized in that: The pre-cutting punch (22) and the final cutting punch (4) are both detachably connected to the output end of the mold clamping component (5).

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