Balancing ring workpiece trimming and punching combined die

Abstract

The application discloses a trimming and punching combined die for a gimbal workpiece, which comprises a bearing seat, a trimming die seat, a die and a top piece assembly, the die is internally provided with a vertical through guide groove, and the top of the top piece assembly is mounted in the vertical through guide groove; the upper portion of the trimming die seat is provided with an upper die plate, and the lower portion of the upper die plate is connected with a punch assembly; wherein the upper die plate drives the punch assembly to move downward and contact with a forged piece on the die under the drive of a press slide, and the punch assembly performs a skin punching action; the punch assembly continues to move vertically downward to cut off the flash formed after the punching of the skin under the drive of the press slide; the top piece assembly moves axially downward along the vertical through guide groove in cooperation with the stroke of the punch assembly during the downward movement of the punch assembly, and the forged piece and the punched skin are ejected when the punch assembly returns. The die can complete the trimming and punching two processes in one stroke, saves labor and equipment kinetic energy, and improves the production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the die technology field of automobile production process, and particularly relates to a trimming and punching compound die for a balance ring workpiece. BACKGROUND

[0002] The balance ring is an important component of an electric motor of an electric vehicle, and its main function is to play a dynamic balancing role through connection with a rotor of the electric motor, so as to effectively guarantee the balance stability during high-speed rotation.

[0003] According to the analysis of the structure and shape of the balance ring, the forging process of the product is blanking, heating, upsetting, finish forging, punching and trimming. In the existing forming process, punching and trimming are two separate processes, and in the daily production process, the two processes are respectively completed by two sets of punching die and trimming die, which not only increases the equipment and labor costs and reduces the production efficiency, but also causes low product precision due to repeated positioning, and is prone to human defects, affects the product quality, and is difficult to meet the requirements of mass production.

[0004] In order to improve the production efficiency, two ways of compound forging or progressive forging are mainly adopted. If progressive die is adopted, although the production efficiency is very high, the structure of the die is relatively complex, the manufacturing precision is relatively high, the general production cycle is long, the cost is high, and the maintenance is also relatively difficult. Therefore, it is necessary to provide a trimming and punching compound die to solve the above technical problems. SUMMARY

[0005] The purpose of the present application is to provide a trimming and punching compound die for a balance ring workpiece, so as to solve the technical problems of complex die structure and high precision in the prior art.

[0006] To solve the above technical problems, the present application specifically provides the following technical scheme:

[0007] A trimming and punching compound die for a balance ring workpiece comprises.

[0008] As a preferred scheme of the present application, a force bearing seat is provided, a trimming die seat is installed on the force bearing seat, a die is arranged in the middle of the trimming die seat, a top piece assembly is arranged on the force bearing seat below the die, a vertical through guide groove is arranged in the inside of the die, and the top of the top piece assembly is installed in the vertical through guide groove;

[0009] An upper die plate connected to a slide block of a press machine is arranged above the trimming die seat, and a punch assembly is connected to the lower surface of the upper die plate;

[0010] The upper die plate drives the punch assembly to move downward and contact the forging piece on the die under the drive of the slide block of the press machine, and the punch assembly performs a skin punching action.

[0011] The punch assembly continues to move vertically downward under the drive of the press slider to cut off the flash formed after the skin is punched;

[0012] The top assembly moves axially downward along the vertical through guide slot in cooperation with the stroke of the punch assembly during the downward movement of the punch assembly, and ejects the forged piece and the punched skin when the punch assembly returns.

[0013] As a preferred scheme of the present application, the top assembly comprises a guide column, a guide seat movably sleeved on the guide column, the guide seat being sleeved in the vertical through guide slot, a pressure bearing spring sleeved on the guide column, and the top of the pressure bearing spring being connected with the guide seat.

[0014] The top of the guide seat is provided with a matching slot, the aperture of the matching slot being the same as the punching diameter of the punch assembly.

[0015] As a preferred scheme of the present application, the punch assembly comprises a trimming column, one end of the trimming column being fixedly connected with the upper die plate, the other end of the trimming column being connected with a punching column head, and the bottom edge of the trimming column forming a trimming edge.

[0016] As a preferred scheme of the present application, the trimming column is provided with a discharging assembly, the discharging assembly comprising a discharging plate sleeved on the trimming column, and the periphery of the discharging plate being connected with the upper die plate through guide spring rods.

[0017] As a preferred scheme of the present application, the trimming column comprises a fixed column body, a rotating column body being installed on the fixed column body, the fixed column body being sleeved on the punching column head and the punching column head being rotatably connected with the fixed column body, and the bottom edge of the rotating column body forming the trimming edge.

[0018] The side edge of the rotating column body is connected with a driving member provided on the discharging plate, the driving member being used to drive the rotating column body to rotate after the discharging plate contacts the trimming die seat.

[0019] As a preferred scheme of the present application, the driving member comprises a rotation hole provided on the discharging plate, the rotating column body being installed in the rotation hole, a plurality of stroke guiding arc grooves being distributed on the side wall of the rotation hole in a central symmetry manner, and a bolt body being provided on the side wall of the rotating column body and embedded in the stroke guiding arc grooves.

[0020] After the discharging plate contacts the trimming die seat, the bolt body moves along the stroke guiding arc grooves to drive the rotating column body to rotate.

[0021] As a preferred scheme of the present application, the cutting blade comprises a plurality of blade bodies arranged equidistantly on the bottom circumferential edge of the rotating cylinder, one side of the blade body is provided with a peak breaking edge, and the peak breaking edge is along the radial direction of the rotating cylinder;

[0022] Wherein, after the stripper plate contacts the trimming die cavity, the movement of the pin along the stroke guide arc groove drives the rotating cylinder to rotate, and the arc length is greater than the arc length between two adjacent blade bodies.

[0023] As a preferred scheme of the present application, the top of the guide seat is provided with a circular table petal seat, the circular table petal seat comprises a plurality of petal units, and the side of the petal unit close to the guide seat forms the matching groove;

[0024] The punch cylinder is provided with an expansion ring, and the distance between the expansion ring and the end of the punch cylinder is less than the distance between the blade body and the punch cylinder;

[0025] Wherein, the punch assembly continues to move vertically downward under the driving of the press slide, so that the expansion ring enters the matching groove, and the waist line arc surface of the circular table petal seat contacts the inner side surface of the bottom of the forging.

[0026] As a preferred scheme of the present application, the upper die plate on both sides of the stripper plate is provided with a guide rod, and the trimming die seat is provided with a guide hole penetrating through the guide rod and the force bearing seat.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] The present application provides a composite die, which can complete the trimming and punching processes in one stroke of a press machine after the workpiece is placed in the composite tooling after the die forging of the workpiece is formed. The present application not only solves the quality problem caused by trimming and punching, but also saves labor and equipment energy, and improves production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical schemes in the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only exemplary, and other implementation drawings can be obtained according to the provided drawings without creative labor for those skilled in the art.

[0030] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application;

[0031] Figure 2 It is a schematic diagram of the overall structure of the top piece assembly of the embodiment of the present application;

[0032] Figure 3 The overall structure schematic diagram of the embodiment of the present application is shown in Figure 1

[0033] Figure 4 The trimming die and structure schematic diagram of the embodiment of the present application is shown in

[0034] Figure 5 The blade body structure schematic diagram of the embodiment of the present application is shown in

[0035] The numbers in the figures respectively represent as follows:

[0036] 1-bearing seat; 2-trimming die seat; 3-die; 4-vertical through guide groove; 5-top piece assembly; 6-upper die plate; 7-punch assembly; 8-unloading assembly; 9-driving piece; 10-guide rod; 11-guide hole;

[0037] 51-guide column; 52-guide seat; 53-pressure spring; 54-matching groove; 55-circular table petal seat; 56-petal body unit;

[0038] 71-trimming column; 72-punching column head; 73-trimming blade; 75-fixed column body; 76-peak breaking edge; 77-blade body; 78-expansion ring;

[0039] 81-unloading plate; 82-guide spring rod;

[0040] 91-rotation hole; 92-stroke guide arc groove; 93-stem body. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0042] As shown in Figures 1 to 5 , the present application provides a gimbal workpiece trimming and punching compound die, which comprises a bearing seat 1, a trimming die seat 2 installed on the bearing seat 1, a die 3 arranged in the middle of the trimming die seat 2, a top piece assembly 5 arranged on the bearing seat 1 below the die 3, a vertical through guide groove 4 arranged inside the die 3, and the top of the top piece assembly 5 installed in the vertical through guide groove 4. An upper die plate 6 connected to the slide block of a press machine is arranged above the trimming die seat 2, and a punch assembly 7 is connected to the lower surface of the upper die plate 6.

[0043] ​Wherein, the upper die plate 6 drives the punch assembly 7 to move down to contact the forging on the die 3, and the punch assembly 7 performs the piercing action of the skin. The punch assembly 7 continues to move down vertically under the drive of the press slide to cut off the flash formed after the skin is pierced.

[0044] The top piece assembly 5 moves down axially along the vertical through guide slot 4 during the downward movement of the punch assembly 7, and ejects the forging and the pierced skin when the punch assembly 7 returns.

[0045] When the press slide is in the uppermost position (referring to the initial position of the driving stroke of the press), the top piece assembly 5 is in the highest position (initial state without external force), and at this time the forging is placed on the die and falls on the top piece assembly 5.

[0046] When the press driving slide moves down vertically, the upper die plate moves down. After the forging contacts the die 3, the press driving slide continues to move down, the punch assembly 7 contacts the forging to remove the skin, and after the skin is pierced, the skin falls into the cavity formed by the vertical movement of the top piece assembly 5 along the vertical through guide slot 4 (that is, the vertical through guide slot 4 is located above the die 3, and at this time the top piece assembly 5 is compressed to a large stroke position). After that, the punch assembly 7 continues to move down and pushes the forging to cut off the flash.

[0047] The press driving slide returns, and the top piece assembly 5 ejects the balance ring and the pierced skin, which is convenient for taking out the piece.

[0048] In order to realize the working principle of the top piece assembly 5 described above, the present application provides a specific embodiment of the top piece assembly 5, which includes a guide column 51, a guide seat 52 movably sleeved on the guide column 51, the guide seat 52 being sleeved in the vertical through guide slot 4, a pressure bearing spring 53 being sleeved on the guide column 51, and the top of the pressure bearing spring 53 being connected with the guide seat 52. The top of the guide seat 52 is provided with a matching groove 54 (the purpose of the matching groove 54 is to allow the pierced skin to fall into the cavity formed by the vertical movement of the top piece assembly 5 along the vertical through guide slot 4, and at this time it falls into the matching groove 54, which is used to collect the pierced skin after piercing), and at this time the aperture of the matching groove 54 is the same as the piercing diameter of the punch assembly 7.

[0049] The punch assembly 7 in the present application includes a trimming column 71, one end of the trimming column 71 being fixedly connected with the upper die plate 6, the other end of the trimming column 71 being connected with a piercing column head 72, and the bottom edge of the trimming column 71 forming a trimming edge 73.

[0050] The present application is based on the existing action of the stripper plate, and a stripper assembly 8 is installed on the trimming post 71, the stripper assembly 8 comprises a stripper plate 81 sleeved on the trimming post 71, and the stripper plate 81 is connected with the upper die plate 6 through a guide spring rod 82 around the stripper plate 81. When the driving slider of the press moves vertically downward, the upper die plate and the stripper plate 81 move downward synchronously. When the stripper plate 81 contacts the trimming concave die seat 2, the stripper plate 81 stops moving downward, and at this time, the spring of the compression guide spring rod 82 starts to compress.

[0051] Among them, when the stripper plate 81 contacts the upper surface of the trimming concave die seat 2, the press driving slider moves vertically downward, the upper die plate 6 contacts the stripper plate 81 to control the maximum stroke of the punching post head 72, and at this time, the guide spring rod 82 is still within its elastic coefficient.

[0052] Further, in the present application, in order to carry out the punching in the rotating direction in the punching and cutting process, that is, to convert the force acting in the axial direction of the forged piece into the force acting in the circumferential direction of the forged piece, the purpose of this is to reduce the damage to the main body of the forged piece when the forged piece is punched in the axial direction, and to adapt to the curvature of the balance ring product.

[0053] Therefore, the trimming post 71 comprises a fixed post body 75, a rotating post body is installed on the fixed post body 75, the fixed post body 75 is sleeved on the punching post head 72, and the punching post head 72 is rotationally connected with the fixed post body 75, and the bottom edge of the rotating post body forms a cutting edge 73. Among them, the side of the rotating post body is connected with the driving piece 9 arranged on the stripper plate 81, and the driving piece 9 is used to drive the rotating post body to rotate after the stripper plate 81 contacts the trimming concave die seat 2.

[0054] That is, the contact between the stripper plate 81 and the trimming concave die seat 2 is used as a trigger signal, at this time, the stripper plate 81 has no ability to continue to move downward, the driving piece 9 starts to drive the rotating post body to rotate, and the cutting edge 73 contacts the punching skin (that is, the flash) to start cutting.

[0055] Further, the driving piece 9 can be a kind of active control telescopic rod, and the telescopic rod applies force along the tangential direction of the rotating post body, so that the rotating post body rotates.

[0056] However, in order to utilize the contact action between the trimming concave die 2 and the stripper plate 81 and the travel action of the fixed post body 75 to continue to punch the flash, the present application provides a specific embodiment of the driving piece 9:

[0057] The rotary hole 91 is arranged on the discharge plate 81, the rotating column is installed in the rotary hole 91, a plurality of stroke guide arc grooves 92 are distributed on the side wall of the rotary hole 91 and are arranged in a central symmetry, and the side wall of the rotating column is provided with a bolt body 93 embedded in the stroke guide arc groove 92; wherein, after the discharge plate 81 contacts the trimming die holder 2, the bolt body 93 moves along the stroke guide arc groove 92 to drive the rotating column to rotate.

[0058] The cutting blade 73 comprises a plurality of blade bodies 77 arranged at equal intervals on the circumferential edge of the bottom of the rotating column, one side of the blade body 77 is provided with a peak breaking edge 76, and the peak breaking edge 76 is along the radial direction of the rotating column, that is, when the punching and cutting action is performed, the bottom of the peak breaking edge 76 first contacts the punching and cutting skin, and after piercing the punching and cutting skin (flash), the blade body 77 begins to contact the punching and cutting skin for circumferential cutting (the blade body has a length in the circumferential direction).

[0059] Among them, the 90° angle between the peak breaking edge 76 and the blade body 77 is smoothly transitioned, which can realize the downward guiding action of the cutting part and guide the punching and cutting skin after cutting.

[0060] Among them, after the discharge plate 81 contacts the trimming die holder 2, the bolt body 93 moves along the stroke guide arc groove 92 to drive the rotating column to rotate, and the arc length is greater than the arc length between adjacent two blade bodies 77, and the purpose is to make the circumferential rotation of the plurality of blade bodies 77 greater than the circumferential length of the flash of the forging that needs to be cut, so as to ensure the complete cutting of the punching and cutting skin (flash).

[0061] In the existing punching and trimming technical scheme, the blade body (that is, the punch) directly punches and cuts the flash or the punching and cutting skin, among which, since the forging body is in a fixed state at this time, the single punching and cutting process will cause the surface of the connection between the bottom of the punching and cutting skin and the forging body to be deformed in the pressure process, and if the connection between the punching and cutting skin and the forging body is relatively tight, the forging body will also be torn, which will obviously cause the yield of the forging to decrease.

[0062] Therefore, in the punching and cutting process, the bottom of the punching and cutting skin is first supported, and then the support to the bottom of the punching and cutting skin is lost when the punching and cutting of the punching and cutting skin is completed. In this way, the state of the punching and cutting skin can be maintained during the punching and cutting, that is, the strain of the punching and cutting of the punching and cutting skin is towards the radial direction of the guide base 52.

[0063] To this end, the top of the guide base 52 is provided with a circular table petal seat 55, which comprises a plurality of petal units 56, the side of the plurality of petal units 56 close to the guide base 52 forms a matching groove 54. The punch column head 72 is provided with an expansion ring 78 on the column body, the distance between the expansion ring 78 and the end of the punch column head 72 is less than the distance between the blade body 77 and the punch column head 72. Wherein, the punch assembly 7 continues to move vertically downward under the drive of the press slide, so that the expansion ring 78 enters the matching groove 54, and the waist line arc surface of the circular table petal seat 55 contacts the inner side surface of the bottom of the forging.

[0064] After the punch assembly 7 completes the punching action of the punching skin, the punch assembly 7 continues to move vertically downward under the drive of the press slide, at this time the expansion ring 78 on the punch column head 72 enters the matching groove 54, and then begins to extrude the inner wall of the petal unit 56 close to the matching groove 54, so that the petal unit 56 is extruded towards the bottom inner side surface of the punching skin of the forging.

[0065] Of course, the petal unit 56 adopts a metal material with deformable performance.

[0066] Since the plurality of petal units 56 as a whole is circular table, the waist line part is designed as an arc line, so that the bottom of the punching skin and the connection part of the forging can be supported.

[0067] Subsequently, the blade body 77 begins to contact the upper surface of the punching skin and the connection part of the forging (that is, the flash generated after the punching mentioned above) in the continued downward stroke of the punch assembly 7, and performs a cutting action until the blade body 77 walks through the height distance of the flash.

[0068] This height distance is obtained according to the average value obtained in the production process according to the existing balance ring.

[0069] In the present application, the surface of the blade body 77 close to the surface of the circular table petal seat 55 can be designed to match the waist line shape of the circular table petal seat 55, so that even if the blade body 77 completes the cutting stroke of the flash, it will not contact the circular table petal seat 55 and be damaged, and the matching degree of the two in the cutting action is improved.

[0070] Of course, before the blade body 77 completes the cutting action, the expansion ring 78 needs to stop extruding the contact surface with the petal unit 56. The matching groove 54 can be designed as two ends, the matching groove 54 located in the part of the circular table petal seat 55 is slightly larger than or equal to the diameter of the punch column head 72, and the diameter of the matching groove 54 located in the part of the guide base 52 is greater than or equal to the outer diameter of the expansion ring 78, the purpose is that when the expansion ring 78 enters this part, the radial extrusion force of the plurality of petal units 56 has been lost.

[0071] Therefore, the middle protrusion of the expansion ring 78 is smoothly tapered towards both ends, as shown in Figure 4

[0072] Further, the present application realizes accurate guiding and stroke between the trimming die holder 2 and the punch assembly 7 by setting guiding rods 10 on the upper die plate 6 on both sides of the stripper plate 81, and setting guiding holes 11 on the trimming die holder 2 which are penetrated through the guiding rods 10 and the force bearing seat 1.

[0073] Further, the guiding rod 10 can have a multi-section structure, for example, a telescopic rod structure.

[0074] The above embodiments are only exemplary embodiments of the present application, and are not used to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements are also regarded as falling within the protection scope of the present application.​

Claims

1. A trimming and piercing compound die for a gimbal workpiece, characterized in that it comprises a force bearing seat (1), a trimming die seat (2) mounted on the force bearing seat (1), a die (3) arranged in the middle of the trimming die seat (2), a top piece assembly (5) arranged on the force bearing seat (1) below the die (3), a vertical through guide slot (4) arranged inside the die (3), and the top of the top piece assembly (5) is mounted in the vertical through guide slot (4); an upper die plate (6) connected to the slide of a press is arranged above the trimming die seat (2), and a punch assembly (7) is connected to the lower surface of the upper die plate (6); wherein the upper die plate (6) drives the punch assembly (7) to move downward and contact the workpiece on the die (3) under the drive of the slide of the press, and the punch assembly (7) performs the piercing action of the skin; the punch assembly (7) continues to move vertically downward to cut off the flash formed after the piercing of the skin under the drive of the slide of the press; the top piece assembly (5) moves axially downward along the vertical through guide slot (4) in cooperation with the stroke of the punch assembly (7) during the downward movement of the punch assembly (7), and ejects the workpiece and the pierced skin when the punch assembly (7) returns.

2. The trimming and piercing compound die for a gimbal workpiece according to claim 1, characterized in that the top piece assembly (5) comprises a guide column (51), a guide seat (52) movably sleeved on the guide column (51), the guide seat (52) is sleeved in the vertical through guide slot (4), a pressure bearing spring (53) is sleeved on the guide column (51), and the top of the pressure bearing spring (53) is connected to the guide seat (52); a matching groove (54) is arranged on the top of the guide seat (52), and the hole diameter of the matching groove (54) is the same as the piercing diameter of the punch assembly (7).

3. The trimming and piercing compound die for a gimbal workpiece according to claim 1, characterized in that the punch assembly (7) comprises a trimming column (71), one end of the trimming column (71) is fixedly connected to the upper die plate (6), the other end of the trimming column (71) is connected to a piercing column head (72), and a cutting edge (73) is formed on the bottom edge of the trimming column (71).

4. The trimming and piercing compound die for a gimbal workpiece according to claim 3, characterized in that a discharging assembly (8) is mounted on the trimming column (71), the discharging assembly (8) comprises a discharging plate (81) sleeved on the trimming column (71), and the periphery of the discharging plate (81) is connected to the upper die plate (6) through guide spring rods (82).

5. The trimming and piercing compound die for a gimbal workpiece according to claim 4, characterized in that the trimming column (71) comprises a fixed column body (75), a rotating column body is mounted on the fixed column body (75), the rotating column body is sleeved on the piercing column head (72), the rotating column body is rotatably connected to the fixed column body (75), and the cutting edge (73) is formed on the bottom edge of the rotating column body. ​ ​ ​ ​ ​ The side of the rotating column is connected with a driving element (9) arranged on the stripper plate (81), and the driving element (9) is used to drive the rotating column to rotate after the stripper plate (81) contacts the trimming die holder (2).

6. The trimming and piercing combined die for the gimbal workpiece according to claim 5, characterized in that, The driving element (9) comprises a rotating hole (91) arranged on the stripper plate (81), the rotating column is installed in the rotating hole (91), the side wall of the rotating hole (91) is distributed with a plurality of stroke guiding arc grooves (92) arranged in a central symmetry, and the side wall of the rotating column is arranged with a bolt body (93) embedded in the stroke guiding arc groove (92). Wherein, after the stripper plate (81) contacts the trimming die holder (2), the bolt body (93) moves along the stroke guiding arc groove (92) to drive the rotating column to rotate.

7. The trimming and piercing combined die for the gimbal workpiece according to claim 6, characterized in that, The cutting blade (73) comprises a plurality of blade bodies (77) arranged at equal intervals on the bottom circumferential edge of the rotating column, one side of the blade body (77) is arranged with a peak breaking edge (76), and the peak breaking edge (76) is along the radial direction of the rotating column. Wherein, after the stripper plate (81) contacts the trimming die holder (2), the arc length of the rotating column driven to rotate by the bolt body (93) moving along the stroke guiding arc groove (92) is greater than the arc length between two adjacent blade bodies (77).

8. The trimming and piercing combined die for the gimbal workpiece according to claim 7, characterized in that, The upper die plate (6) arranged on both sides of the stripper plate (81) is arranged with a guide rod (10), and the trimming die holder (2) is arranged with a guide hole (11) penetrating through the force bearing seat (1) and matched with the guide rod (10).

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