Punch forming device for automobile parts

Abstract

The invention discloses an automobile part punch forming device, and relates to the field of automobile sheet metal parts, the automobile part punch forming device comprises a machining table used for bearing sheet metal parts and a rack provided with a punching tool, the punching tool vertically punches downwards to achieve punching forming of the sheet metal parts, and the automobile part punch forming device further comprises a deburring mechanism; and the deburring mechanism comprises an annular groove formed in the machining table, the annular groove is located below the punching tool, two arc-shaped polishing pieces are oppositely arranged in the annular groove, and after punching forming is finished, the two arc-shaped polishing pieces move in the annular groove to remove burrs of the sheet metal part. Through the arrangement of the two arc-shaped polishing parts, after punching forming is finished, the two arc-shaped polishing parts swing and slide at the bottom of a punched hole, so that the polishing surfaces on the arc-shaped polishing parts are in sliding contact with burrs at the edge of the punched hole, and the burrs at the edge of the punched hole are polished.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of automobile sheet metal part processing, and particularly relates to an automobile part stamping forming device. BACKGROUND

[0002] The automobile part mentioned in the application is specifically an automobile sheet metal part, and it is known that the automobile sheet metal part is a shell of various subassemblies. Punching of the automobile sheet metal part is a forming processing method for obtaining a workpiece with a required shape and size by applying external force to a plate, a strip, a pipe and a profile by a press and a die so that plastic deformation or separation is generated.

[0003] A patent document with the name "Automobile sheet metal part metal stamping device" and the authorization announcement number CN118768470B and the announcement date of 2024-11-12, which comprises a device body and a stamping die mounted in the device body, cooperates the punch, the punch detection sleeve, the punch guide sleeve, the detection gas pack and the punch self-checking system, can automatically detect and sense the punching quality, can assist in judging the state of the punch to facilitate timely maintenance of the punch, promote the precision of the device body to punch the automobile sheet metal part, also avoid damage to the stamping die and the automobile sheet metal part caused by abnormal punching, on the other hand, can also process the position of the extruded protrusion on the edge of the punching hole or the adhesion and residue of the blanking when abnormal punching occurs, effectively avoid damage to the automobile sheet metal part and the upper die core end face in the subsequent compression process, further ensure the stamping quality of the automobile sheet metal part, and effectively realize the automation and intelligent development of the device body, promote the stamping quality and economic benefit.

[0004] In the prior art, when the sheet metal part of the automobile is punched, burrs are easily generated at the edge of the opening of the punched hole punched out by the punching. SUMMARY

[0005] The purpose of the application is to provide an automobile part stamping forming device to solve the above-mentioned problems in the prior art.

[0006] In order to achieve the above-mentioned purpose, the application provides the following technical scheme:

[0007] An automobile part stamping forming device comprises a processing table for bearing a sheet metal part and a rack provided with a stamping tool, the stamping tool vertically punches downward to realize punching forming of the sheet metal part, and further comprises a deburring mechanism, the deburring mechanism comprises an annular groove opened in the inside of the processing table, the annular groove is located below the stamping tool, two arc-shaped polishing pieces are oppositely arranged in the inside of the annular groove, and after the punching forming is completed, the two arc-shaped polishing pieces move in the annular groove to remove burrs of the sheet metal part.

[0008] The stamping cutter is driven by a reciprocating driving unit, the reciprocating driving unit comprises an electric cylinder, the electric cylinder is arranged on the top of the rack, and the telescopic end of the electric cylinder penetrates through the rack and extends to the inside of the rack, so that the telescopic end of the electric cylinder is fixedly connected with the stamping cutter.

[0009] The annular groove is specifically divided into an upper groove body and a lower groove body, the two groove bodies are vertically arranged in a stacked manner, and are in communication and on the same central axis.

[0010] The upper groove body is rotatably connected with a ring gear, two arc-shaped grooves are oppositely arranged on the ring gear, a sliding rod is slidably connected in each arc-shaped groove, an arc-shaped polishing piece is fixedly connected to the end of the sliding rod, and a polishing surface is arranged on the arc-shaped polishing piece, the polishing surface is used for polishing the burrs at the bottom of the punched hole formed by stamping, a tension spring is arranged on one side of the sliding rod, and one end of the tension spring is fixedly connected to the vertical side wall of the arc-shaped groove.

[0011] The arc-shaped polishing piece is slidably connected to the ring gear through the sliding rod, and one end of the arc-shaped polishing piece is in contact with the inner edge of the ring gear.

[0012] The stamping cutter comprises a stamping rod and a tool bit at the bottom end of the stamping rod, an L-shaped push rod is fixedly connected to the outer surface of the stamping rod, and a first inclined surface is arranged at the end of the L-shaped push rod.

[0013] The inside of the machining table is provided with a T-shaped groove, the T-shaped groove is composed of a vertical groove and a horizontal groove, and the vertical groove is used for inserting the end of the L-shaped push rod.

[0014] The opening of the horizontal groove away from the vertical groove is in communication with the annular groove.

[0015] The inside of the horizontal groove is slidably connected with a straight rack, a second inclined surface matched with the first inclined surface is arranged at the end of the straight rack, so that when the L-shaped push rod is inserted into the vertical groove, the first inclined surface and the second inclined surface are in sliding abutment, so as to push the straight rack to slide in the horizontal groove.

[0016] The straight rack is in meshing connection with the ring gear, and a return spring is arranged at the other end of the straight rack, and one end of the return spring is fixedly connected to the vertical side wall of the horizontal groove.

[0017] In the technical scheme, the automobile part stamping forming device is provided with two arc-shaped polishing members, after the punching forming is completed, the two arc-shaped polishing members swing and slide at the bottom of the punching hole, the polishing surface on the arc-shaped polishing member slides and contacts the burrs at the edge of the punching hole, thereby polishing the burrs at the edge of the punching hole. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0019] Figure 1 A structural schematic diagram of an automobile part stamping forming device provided in the embodiments of the present application is provided.

[0020] Figure 2 A structural schematic diagram of an arc-shaped polishing member in the device is provided. Figure 1 A partial enlarged structural schematic diagram of A in the device is provided.

[0021] Figure 3 A structural schematic diagram of a ring gear in the device is provided. Figure 2 Another perspective structural schematic diagram of the ring gear in the device is provided.

[0022] Figure 4 A structural schematic diagram of an arc-shaped groove in the device is provided. Figure 3 A structural schematic diagram of the arc-shaped groove in the device is provided.

[0023] Figure 5 A partial enlarged structural schematic diagram of B in the device is provided. Figure 4 A partial enlarged structural schematic diagram of B in the device is provided.

[0024] Figure 6 A sectional view schematic diagram of a machining table in the device is provided. Figure 1 BRIEF DESCRIPTION OF DRAWINGS

[0025] 1, machining table; 2, stamping tool; 21, stamping rod; 22, tool bit; 3, rack; 4, electric cylinder; 5, arc-shaped polishing member; 6, annular groove; 61, upper groove body; 62, lower groove body; 7, ring gear; 8, arc-shaped groove; 81, sliding groove; 82, strip-shaped groove; 9, sliding rod; 10, polishing surface; 11, first inclined surface; 12, T-shaped groove; 121, vertical groove; 122, horizontal groove; 13, L-shaped push rod; 14, straight rack; 15, second inclined surface; 16, return spring; 17, tension spring; 18, first vertical surface; 19, second vertical surface; 20, third vertical surface.

[0026] DETAILED DESCRIPTION

[0027] ​In order for those skilled in the art to better understand the technical solutions of the present application, further detailed description of the present application will be made below in combination with the drawings.

[0028] As Figures 1-6 shown, the automobile parts stamping forming device provided in the embodiment includes a machining table 1 for carrying sheet metal parts and a rack 3 provided with a stamping tool 2, the stamping tool 2 vertically punches down to realize the punching forming of the sheet metal parts, and further includes a deburring mechanism, the deburring mechanism includes an annular groove 6 opened in the inside of the machining table 1, the annular groove 6 is located below the stamping tool 2, and two arc-shaped polishing pieces 5 are oppositely arranged in the inside of the annular groove 6, after the punching forming is completed, the two arc-shaped polishing pieces 5 move in the annular groove 6 to remove the burrs of the sheet metal parts.

[0029] Specifically, the machining table 1 is horizontally arranged on the inside of the rack 3, which is used to carry the sheet metal parts to be processed, and is used for the horizontal placement of the sheet metal parts, facilitating the stamping operation of the sheet metal parts, wherein the sheet metal parts are generally thin metal plates, in the embodiment, the automobile sheet metal parts can be various sheet metal parts on the vehicle body, which have different shapes, since the embodiment is to solve the punching burr problem, the difference in the shape of the sheet metal parts is irrelevant to the solution of the technical problem of the embodiment, and the embodiment is simplified to a rectangle for the convenience of viewing and understanding, but obviously it can also be other shapes. The machining table 1 is fixedly connected to the inside of the rack 3; the stamping tool 2 is arranged on the rack 3, and the stamping tool 2 is vertically arranged, when stamping, the stamping tool 2 vertically punches down to realize the punching forming of the sheet metal parts, and the stamping tool 2 is preferably driven by a reciprocating driving unit, the reciprocating driving unit includes an electric cylinder 4, the electric cylinder 4 is used to drive the stamping tool 2 to move, so as to complete the stamping operation of the sheet metal parts to form a through hole such as a circular hole on the sheet metal parts; it should be noted that the electric cylinder 4 is arranged on the top of the rack 3, and the telescopic end of the electric cylinder 4 penetrates the rack 3 and extends into the inside of the rack 3, the telescopic end of the electric cylinder 4 extending into the inside of the rack 3 is fixedly connected with the stamping tool 2, so that when the electric cylinder 4 is started, the stamping tool 2 vertically punches down to punch the surface of the sheet metal parts, so as to complete the stamping operation, and the rack 3 is provided with a clamping and positioning mechanism (not shown in the figure), and the clamping and positioning mechanism is used to clamp and fix the sheet metal parts to be processed carried on the machining table 1, so as to avoid the displacement of the sheet metal parts during punching, thereby affecting the normal punching, and the above are all prior art and will not be described in detail.

[0030] The core innovative point of the embodiment of the application is that the deburring mechanism is further included, the deburring mechanism includes an annular groove 6 arranged in the inside of the machining table 1, the annular groove 6 is located below the stamping tool 2, and two arc-shaped polishing pieces 5 are oppositely arranged in the inside of the annular groove 6. After the punching forming is completed, the two arc-shaped polishing pieces 5 move in the annular groove 6 to remove burrs of the sheet metal part.

[0031] Specifically, the annular groove 6 is vertically arranged in the inside of the machining table 1, and the annular groove 6 is located directly below the stamping tool 2, that is, the center axes of the two are on the same vertical line. The annular groove 6 is specifically divided into a stepped groove-shaped upper groove body 61 and a lower groove body 62, and the two groove bodies are vertically adjacent. It should be noted that the opening of the upper groove body 61 is larger than that of the lower groove body 62, and the inner diameter of the lower groove body 62 is slightly larger than the outer diameter of the stamping tool 2. The upper groove body 61 is rotatably connected with a ring gear 7 (the ring gear 7 is rotatably connected with a ring-shaped rotating groove in the bottom wall of the upper groove body 61 through a ring-shaped protrusion on the bottom end face), and the inner diameter of the ring gear 7 is slightly larger than the outer diameter of the stamping tool 2. In this way, when the sheet metal part on the machining table 1 is punched, the stamping tool 2 is driven to move vertically downward to punch the sheet metal part by starting the electric cylinder 4, and the stamping tool 2 is inserted into the inside of the annular groove 6, that is, the stamping tool 2 passes through the inside of the ring gear 7 and enters the lower groove body 62, so as to complete the punching operation, and the waste produced by punching is discharged from the bottom of the annular groove 6. The ring gear 7 is rotatably connected in the upper groove body 61, two arc-shaped grooves 8 are oppositely arranged on the upper end face of the ring gear 7, a sliding rod 9 is slidably connected in each arc-shaped groove 8, and the arc-shaped polishing piece 5 is fixedly connected to the end of the sliding rod 9. The top surface of the arc-shaped polishing piece 5 is a polishing surface 10, and the polishing surface 10 is used for polishing the burrs at the bottom of the punched hole formed by stamping. The top surface of the arc-shaped polishing piece 5, that is, the polishing surface 10, is on the same plane as the top of the machining table 1. In this way, when the sheet metal part to be processed is carried on the machining table 1, it is in a horizontal state to facilitate the stamping operation, and also supports the stamping position of the sheet metal part. At the same time, when the sheet metal part is clamped by the clamping and positioning mechanism, the top surface of the arc-shaped polishing piece 5 is in abutment with the bottom surface of the sheet metal part. In this way, during the rotation of the ring gear 7, the arc-shaped polishing piece 5 cannot be rotated synchronously, but can only slide along the arc-shaped groove 8 to limit the rotation of the arc-shaped polishing piece 5.

[0032] The arc-shaped polishing piece 5 is slidably connected to the ring gear 7 through a sliding rod 9, the outer surface of the sliding rod 9 is provided with two first vertical faces 18 and a second vertical face 19, the two first vertical faces 18 are oppositely arranged; the arc-shaped groove 8 comprises a sliding groove 81 and a strip-shaped groove 82, the opening of the sliding groove 81 is communicated with the strip-shaped groove 82, and the other opening is connected with the vertical side wall of the ring gear 7; the opening of the strip-shaped groove 82 is just corresponding to the second vertical face 19; the inner wall of the sliding groove 81 is provided with a third vertical face 20, the third vertical face 20 is matched with the first vertical face 18, so that when the third vertical face 20 is in abutment with the first vertical face 18 on the sliding rod 9, the sliding rod 9 cannot rotate, because the first vertical face 18 on the sliding rod 9 is in abutment with the third vertical face 20, thereby limiting the sliding rod 9, so that the sliding rod 9 cannot rotate; the second vertical face 19 is provided with a tension spring 17, one end of the tension spring 17 is fixed to one side in the strip-shaped groove.

[0033] It should be noted that when the arc-shaped polishing piece 5 is in the initial state, one end of the arc-shaped polishing piece 5 is close to the central axis of the ring gear 7, and the other end is away from the central axis of the ring gear 7, that is, the arc-shaped polishing piece 5 is in an inclined state on the ring gear 7, so that when the stamping cutter 2 is inserted into the ring gear 7, the end of the arc-shaped polishing piece 5 close to the central axis of the ring gear 7 is in abutment with the outer surface of the stamping cutter 2;

[0034] In the above description, by limiting the sliding rod 9, one end of the arc-shaped polishing piece 5 is close to the central axis of the ring gear 7, and the other end is away from the central axis of the ring gear 7, that is, the arc-shaped polishing piece 5 is in an inclined state on the ring gear 7;

[0035] Specifically, when the ring gear 7 rotates, the sliding rod 9 slides in the sliding groove 81, so that the end of the arc-shaped polishing piece 5 away from the central axis gradually abuts against the outer surface of the stamping cutter 2, so that the movement track of the arc-shaped polishing piece 5 is swinging, thereby improving the polishing effect on the burr of the punched hole.

[0036] The stamping cutter 2 comprises a stamping rod 21 and a cutter head 22 at the bottom end of the stamping rod 21, the outer surface of the stamping rod 21 is provided with a polishing protrusion, and the polishing protrusion is used for polishing the inner wall of the punched hole;

[0037] The outer surface of the punching rod 21 is fixedly connected with an L-shaped push rod 13, and the end of the L-shaped push rod 13 is provided with a first inclined surface 11 facing the machining table 1; the inside of the machining table 1 is provided with a T-shaped groove 12, which includes a vertical groove 121 and a horizontal groove 122, wherein the vertical groove 121 is used for the end of the L-shaped push rod 13 to be inserted, so that when the punching tool 2 is punched downward, the first inclined surface 11 of the end of the L-shaped push rod 13 is inserted into the inside of the vertical groove 121; wherein the horizontal groove 122 is communicated with the upper groove body 61 of the annular groove 6 away from an opening of the vertical groove 121; and the inside of the horizontal groove 122 is slidably connected with a straight rack 14, and the end of the straight rack 14 is provided with a second inclined surface 15 matched with the first inclined surface 11, so that when the L-shaped push rod 13 is inserted into the inside of the vertical groove 121, the first inclined surface 11 and the second inclined surface 15 are slidably abutted, thereby pushing the straight rack 14 to slide in the horizontal groove 122; the straight rack 14 is engaged with the ring gear 7, and the other end of the straight rack 14 is provided with a return spring 16, one end of the return spring 16 is fixedly connected to the vertical side wall of the horizontal groove 122;

[0038] Specifically, the movement direction of the L-shaped push rod 13 is consistent with the movement direction of the punching tool 2, and both are vertically moved, but they are not in the same horizontal direction, so that when the punching tool 2 is inserted into the inside of the annular groove 6, the L-shaped push rod 13 is just inserted into the vertical groove 121 in the T-shaped groove 12, so that the first inclined surface 11 of the L-shaped push rod 13 is slidably abutted on the second inclined surface 15 of the straight rack 14, thereby driving the straight rack 14 to slide horizontally and engage with the ring gear 7, so that the ring gear 7 is passively rotated, and since the arc-shaped polishing piece 5 and the metal plate are in abutment, the synchronous rotation of the arc-shaped polishing piece 5 and the ring gear 7 is limited, so that the arc-shaped polishing piece 5 slides in the arc-shaped groove 8 through the sliding rod 9, that is, the first vertical surface 18 on the sliding rod 9 is separated from the third vertical surface 20 of the sliding groove 81, at this time the tension spring 17 is stretched, and at the same time, the sliding rod 9 loses the limit and rotates in the sliding groove 81, so that the end of the arc-shaped polishing piece 5 away from the center axis of the ring gear 7 gradually approaches and abuts on the punching rod 21 of the punching tool 2, that is, the arc-shaped polishing piece 5 swings while approaching and abutting on the side wall of the punching rod 21 of the punching tool 2, at this time, through the sliding of the two arc-shaped polishing pieces 5, the polishing surface 10 swings and polishes the burr at the bottom of the punching hole formed by punching, so as to remove the burr generated by punching. At the same time, when the two arc-shaped polishing pieces 5 contact the side wall of the punching tool 2, that is, the positions of the two arc-shaped polishing pieces 5 are limited, so that they just complete the displacement for polishing the burr generated by punching, that is, the vertical side wall of the arc-shaped polishing piece 5 coincides with the inner edge of the ring gear 7;

[0039] In the above description, when the stamping tool 2 is first inserted into the annular groove 6, then the L-shaped push rod 13 is inserted into the T-shaped groove 12, and the straight rack 14 is driven to drive the ring gear 7 to swing the two arc-shaped polishing pieces 5, until the stamping rod 21 of the stamping tool 2 inserted into the annular groove 6 is abutted, so that in the sliding abutting process of the arc-shaped polishing piece 5, there are two effects, one is that the polishing surface 10 can swing and polish the burrs generated by punching; the second is that the arc-shaped polishing piece 5 can be limited by the stamping rod 21 of the stamping tool 2 during sliding.

[0040] In the embodiment, the arc-shaped polishing piece 5 has two states:

[0041] When the arc-shaped polishing piece 5 is in the first state, that is, one end of the arc-shaped polishing piece 5 is close to the center axis of the ring gear 7, and the other end is away from the center axis of the ring gear 7;

[0042] When the arc-shaped polishing piece 5 is in the second state, that is, the two ends of the arc-shaped polishing piece 5 abut the surface of the stamping rod 21;

[0043] Specifically, when switching from the first state to the second state, the electric cylinder 4 is started to drive the stamping tool 2 to punch the metal plate on the machining table 1, and when the punching is finished, that is, the stamping tool 2 and the stamping rod 21 are inserted into the inside of the annular groove 6, at this time, the L-shaped push rod 13 is inserted into the vertical groove 121 in the T-shaped groove 12, and slides and abuts between the first inclined surface 11 and the second inclined surface 15 on the straight rack 14, so that the straight rack 14 slides and extrudes the return spring 16. Because the straight rack 14 and the ring gear 7 are in meshing state, the ring gear 7 is driven to rotate, the sliding rod 9 slides in the arc-shaped groove 8, and the arc-shaped polishing piece 5 swings and slides, that is, slides and contacts on the burr generated by punching, and the polishing surface 10 polishes the generated burr;

[0044] In the above description, the switching action from the first state to the second state is switched by the electric cylinder 4. Specifically, during the grinding, the electric cylinder 4 is started to drive the punching tool 2 to punch the metal sheet on the machining table 1, and the punching tool 2 is first inserted into the inside of the annular groove 6, then the L-shaped push rod 13 is inserted into the vertical slot 121 in the T-shaped slot 12, and the first inclined surface 11 is in sliding abutment with the second inclined surface 15 on the straight rack 14, so that the straight rack 14 slides, and since the straight rack 14 is in meshing with the ring gear 7, the ring gear 7 is driven to rotate, the sliding rod 9 slides in the arc-shaped groove 8, and the arc-shaped grinding piece 5 gradually approaches and abuts on the punching rod 21 on the punching tool 2, that is, the arc-shaped grinding piece 5 slides and swings, and is in sliding contact with the burrs generated by the punching, and the grinding surface 10 grinds the burrs.

[0045] When the grinding is finished, the electric cylinder 4 is started again to drive the punching tool 2 to move upward, that is, the grinding protrusion on the punching rod 21 slides and rubs with the punching hole, so as to grind the vertical side wall of the punching hole; and when the punching tool 2 moves upward, the first inclined surface 11 of the L-shaped push rod 13 is out of abutment with the second inclined surface 15 on the straight rack 14, and at the same time, the metal sheet with the completed punching hole is taken off the machining table 1. First, the straight rack 14 is again meshed with the ring gear 7 by the rebound of the return spring 16, and at the same time, the sliding rod 9 reversely slides in the arc-shaped groove 8 by the rebound of the tension spring 17, so that the two arc-shaped grinding pieces 5 slide away from each other, that is, gradually out of abutment with the punching tool 2, until sliding to the initial position (one end of the arc-shaped grinding piece 5 approaches the central axis of the ring gear 7, and the other end is away from the central axis of the ring gear 7).

[0046] The beneficial effects of the embodiment are that the two arc-shaped grinding pieces 5 are provided, and after the punching forming is finished, the arc-shaped grinding pieces 5 swing and slide at the bottom of the punching hole, so that the grinding surface 10 on the arc-shaped grinding piece 5 is in sliding contact with the burrs at the edge of the punching hole, thereby grinding the burrs at the edge of the punching hole.

[0047] The above only describes certain exemplary embodiments of the application by way of illustration, and it is self-evident that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the application. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the application.

Claims

1. An automobile part stamping forming device, comprising a machining table for carrying sheet metal parts and a rack provided with a stamping tool, the stamping tool vertically downwardly punches to realize the punching forming of the sheet metal parts, characterized in that: it further comprises a deburring mechanism, the deburring mechanism comprises an annular groove opened in the inside of the machining table, the annular groove is located below the stamping tool, the inside of the annular groove is oppositely provided with two arc-shaped polishing pieces, after the punching forming is finished, the two arc-shaped polishing pieces move in the annular groove to remove the burrs of the sheet metal parts. The stamping tool is driven by a reciprocating driving unit, the reciprocating driving unit comprises an electric cylinder, the electric cylinder is arranged on the top of the rack, and the telescopic end of the electric cylinder penetrates through the rack and extends into the inside of the rack, in this way, the telescopic end of the electric cylinder is fixedly connected with the stamping tool.

2. The automobile part press forming device according to claim 1, wherein The annular groove is specifically divided into an upper groove body and a lower groove body, the two groove bodies are vertically stacked and are in communication and on the same central axis.

3. The device for stamping and forming a part of an automobile according to claim 1, wherein An annular gear is rotatably connected in the upper groove body, two arc-shaped grooves are oppositely opened on the annular gear, a sliding rod is slidably connected in each arc-shaped groove, the arc-shaped polishing piece is fixedly connected to the end of the sliding rod, and a polishing surface is arranged on the arc-shaped polishing piece, the polishing surface is used for polishing the burrs at the bottom of the punched hole formed by stamping, a tension spring is arranged on one side of the sliding rod, and one end of the tension spring is fixedly connected to the vertical side wall of the arc-shaped groove.

4. The apparatus according to claim 3, wherein The arc-shaped polishing piece is slidably connected to the annular gear through the sliding rod, and one end of the arc-shaped polishing piece contacts the inner edge of the annular gear.

5. The apparatus according to claim 4, wherein The stamping tool comprises a stamping rod and a tool head at the bottom end of the stamping rod, an L-shaped push rod is fixedly connected to the outer surface of the stamping rod, and a first inclined surface is opened at the end of the L-shaped push rod.

6. The device for stamping and forming a part of an automobile according to claim 1, wherein A T-shaped groove is opened in the inside of the machining table, the T-shaped groove is composed of a vertical groove and a horizontal groove, the vertical groove is used for inserting the end of the L-shaped push rod.

7. The device according to claim 1, wherein One opening of the horizontal groove away from the vertical groove is in communication with the annular groove.

8. The apparatus according to claim 7, wherein A straight rack is slidably connected in the inside of the horizontal groove, a second inclined surface matched with the first inclined surface is opened at the end of the straight rack, in this way, when the L-shaped push rod is inserted into the inside of the vertical groove, the first inclined surface and the second inclined surface slide and abut, thereby pushing the straight rack to slide in the horizontal groove.

9. The apparatus according to claim 8, wherein The straight rack is engaged with the annular gear, and a return spring is arranged at the other end of the straight rack, one end of the return spring is fixedly connected to the vertical side wall of the horizontal groove.

10. The apparatus according to claim 9, wherein ​

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