Progressive die for producing seat headrest pipe

Abstract

The utility model discloses a progressive die used for producing a seat headrest pipe, which comprises an upper die holder and a lower die holder, a punching die, a trimming die, a first shape cutting die, a trimming die, a second shape cutting die, a flanging die, a bending die, a slotting die, a core-pulling type compound die and a cutting die are orderly arranged between the upper die holder and the lower die holder, the punching die is used for punching a guide hole, and the cutting die is used for cutting the guide hole. The trimming die is used for punching a guide groove, the first shape cutting die is used for punching an inner edge portion and an inner side meshing tooth portion, the trimming die is used for punching the inner edge portion, the second shape cutting die is used for punching an outer edge portion and an outer side meshing tooth portion, the flanging die is used for forming a flanging portion, the bending die is used for forming a left side plate and a right side plate, and the grooving die is used for punching an open groove. The core-pulling type compound die is used for forming, and the cutting die is used for separating a formed part; the multi-station progressive die process is adopted, tool investment can be reduced, production time can be greatly shortened, production cost can be reduced, production efficiency can be improved, and stability of dimensional accuracy of products is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of progressive die of automobile parts, especially a progressive die for producing seat headrest pipe. BACKGROUND

[0002] The headrest pipe is a supporting part of the headrest of an automobile seat, and its main function is to fix the position of the headrest and provide comfortable head support to effectively relieve neck fatigue and discomfort caused by long-time driving. At the same time, the headrest pipe also has a certain safety function, which can effectively reduce the damage to the neck when the vehicle collides; in the configuration of the automobile seat, the loading capacity of the headrest pipe of the front row, the middle row and the rear row is basically greater than 2 pieces.

[0003] According to the conventional single-process stamping production process, at least six sequence dies (blanking --- chamfering --- flanging --- bending --- side pushing forming --- core pulling shaping) are required for an ordinary tooth-shaped seat headrest pipe, and at least six production operators are required in production, which has the problems of long production process, high production cost and low production efficiency. If the loading capacity of the headrest pipe per vehicle and the market size of the vehicle model are large, the ordinary single-process production mode does not have cost advantages.

[0004] As shown in Figure 1 The structure of the seat headrest pipe: including a plate body, the plate body is bent into a three-dimensional shape, the three-dimensional shape is composed of a front side plate 1, a left side plate 2 and a right side plate 3, the left side plate and the right side plate are both provided with a tooth-shaped flange part 4, and the three-dimensional shape is combined into a rectangular pipe body through the meshing flange parts; the front side plate is provided with an open slot 5 on one side edge. SUMMARY

[0005] The utility model provides a kind of progressive die for producing seat headrest pipe, solve the problem of single-process production mode existence production cost, production efficiency is low, product quality stability is poor.

[0006] In order to solve the above technical problems, the technical scheme of the utility model is: a kind of progressive die for producing seat headrest pipe, including upper die seat and lower die seat, upper die seat and lower die seat are connected by guide assembly, and there is orderly arrangement between upper die seat and lower die seat Punching die, trimming die, first cut profile die, trimming die, second cut profile die, flanging die, bending die, slotting die, core pulling type compound die and cutting die, punching die is used to punch guide hole on material belt, trimming die is used to punch guide slot on the edge of material belt, first cut profile die is used to punch inner edge and inner side tooth part on material belt, trimming die is used to trim inner edge on material belt, second cut profile die is used to punch outer edge and outer side tooth part on material belt, flanging die is used to form flange part on plate material, bending die is used to form left side plate and right side plate on plate material, slotting die is used to punch open slot on plate material, core pulling type compound die is used to extrude plate material into formed piece, and cutting die is used to separate material belt and formed piece.

[0007] In furtherance of the above technical solution, the structure of the first cutting profile die comprises a first punch and a first blanking die. The first punch is symmetrically arranged on the upper die seat with the guide hole as the center of symmetry. The first blanking die is fixed on the lower die seat. The cutting edges on the first blanking die are symmetrically arranged.

[0008] In furtherance of the above technical solution, the structure of the flanging die comprises a flanging punch and a flanging die. The flanging punch is symmetrically arranged on the upper die seat with the guide hole as the center of symmetry. The symmetrically arranged flanging die is fixed on the lower die seat corresponding to the flanging punch. The flanging die is composed of two symmetrically arranged flanging forming blocks.

[0009] In furtherance of the above technical solution, the structure of the bending die comprises a bending punch and a bending die. The bending punch is symmetrically arranged on the upper die seat with the guide hole as the center of symmetry. The symmetrically arranged bending die is fixed on the lower die seat corresponding to the bending punch. The structure of the bending die comprises a bending forming block. The bending forming block and the adjacent flanging forming block are combined to form a bending forming cavity.

[0010] In furtherance of the above technical solution, the structure of the core-pulling type compound die comprises a pressing die, a meshing portion shaping die, a side shaping die, and a finishing die which are sequentially arranged along the direction of the material belt conveying. The pressing die is used to press the bent plate into a pipe blank. The meshing portion shaping die is used to flatten the meshing portion of the pipe blank. The side shaping die is used to flatten the left and right sides of the pipe blank. The finishing die is used to press the pipe blank into a formed piece. The core-pulling mechanism is used to pull out the core rod in the pressing die, the meshing portion shaping die, the side shaping die, and the finishing die.

[0011] In furtherance of the above technical solution, the structure of the pressing die comprises a pressing punch, a pressing die, and a pressing core rod. The pressing punch is symmetrically arranged on the upper die seat with the guide hole as the center of symmetry. The symmetrically arranged pressing die is fixed on the lower die seat corresponding to the pressing punch. The pressing die is composed of two symmetrically arranged pressing blocks to form a pressing shaping cavity. The pressing core rod is used to prevent the pipe blank from deforming.

[0012] Further limited to the above technical solutions, the core pulling mechanism is symmetrically arranged with the material belt as the axis of symmetry; the core pulling mechanism comprises a driving member and an executing member; the structure of the driving member comprises a wedge-shaped pressing block and a push rod, the wedge-shaped block is fixed on the upper die holder, one end of the push rod is fixedly connected with the side surface of the wedge-shaped block, and the push rod is inclined; the structure of the executing member comprises a wedge-shaped sliding base, a fixed support, a return spring, a front buffer pad and a rear limiting frame, the wedge-shaped sliding base is slidably connected with the guide rail on the lower die holder, the fixed support is fixed in the front end cavity of the wedge-shaped sliding base, the fixed support is used for connecting the core rod in the pressing die, the engaging part shaping die, the side shaping die and the finishing die and fixing the return spring, the front buffer pad is fixed on the side surface of the clamping plate of the lower die holder, the working end of the return spring is in contact with the front buffer pad, and the return spring is used for driving the wedge-shaped sliding base to return, and the rear limiting frame is fixed on the lower die holder, and the clamping plate of the lower die holder and the rear limiting frame are used for limiting the stroke of the wedge-shaped sliding base; a guide inclined groove is arranged on one side surface of the wedge-shaped sliding base, the guide inclined groove is in sliding fit with the other end of the push rod, and the push rod is used for pushing the wedge-shaped sliding base first; and the return spring is a nitrogen spring.

[0013] The utility model discloses beneficial effects: the utility model discloses multi-station progressive die process can reduce tooling investment, greatly shorten production time, be favorable to reduce production cost and improve production efficiency, and guarantee the stability of product size precision. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a product development graph in the background art;

[0015] Figure 2 It is a product finished product graph in the background art;

[0016] Figure 3 It is a progressive die upper die structure diagram in the utility model;

[0017] Figure 4 It is Figure 3 a local amplification of Figure I ;

[0018] Figure 5 It is Figure 3 a local amplification of Figure II ;

[0019] Figure 6 It is a progressive die lower die structure diagram in the utility model;

[0020] Figure 7 It is Figure 6 a local amplification of Figure I ;

[0021] Figure 8 It is Figure 6 a local amplification of Figure II ;

[0022] Figure 9 This is a sectional view of the core-pulling mechanism;

[0023] Figure 10 It is a strip of material Figure I ;

[0024] Figure 11 It is a strip of material Figure II . Detailed Implementation

[0025] like Figure 3 and Figure 6 As shown, a progressive die for producing seat headrest tubes includes an upper die base 601 and a lower die base 602, which are connected by a guide assembly. Between the upper and lower die bases are arranged a punching die, a trimming die, a first shaped cutting die, a trimming die, a second shaped cutting die, a flanging die, a bending die, a grooving die, a core-pulling composite die, and a cutting die. The punching die is used to punch guide holes in the strip material; the trimming die is used to punch guide grooves on the edge of the strip material; the first shaped cutting die is used to punch inner edges and inner teeth on the strip material; the trimming die is used to trim the inner edges on the strip material; the second shaped cutting die is used to punch outer edges and outer teeth on the strip material; the flanging die is used to form flanged parts on the sheet material; the bending die is used to form left and right side plates on the sheet material; the grooving die is used to punch opening grooves on the sheet material; the core-pulling composite die is used to extrude the sheet material into a molded part; and the cutting die is used to separate the strip material from the molded part.

[0026] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the structure of the punching die includes a punching punch 701 and a punching blanking die 702. The advantages of this structure are: simple structure, which helps to reduce manufacturing costs and is also easy to maintain.

[0027] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the structure of the trimming die includes a trimming punch 801 and a trimming blanking die 802. The advantages of this structure are: simple structure, which helps to reduce manufacturing costs and is also easy to maintain.

[0028] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the structure of the first cutting die includes a first punch 901 and a first blanking die 902. The first punch is symmetrically arranged on the upper die base with the guide hole as the center of symmetry. The first blanking die is fixed on the lower die base. The cutting edges on the first blanking die are symmetrically arranged. The advantages of this structure are: simple structure, improved production efficiency, and reduced production costs.

[0029] As Figure 3 , Figure 4 , Figure 6 and Figure 7 shown, the structure of the trimming die: including trimming punch 1001 and trimming blanking die 1002, trimming punch is symmetrically arranged on the upper die with guide hole as the center of symmetry, trimming blanking die is fixed on the lower die, the blade edge on the trimming blanking die is symmetrically arranged; the advantages of this structure: simple structure, improve the production efficiency, is conducive to reducing production cost;

[0030] As Figure 3 , Figure 4 , Figure 6 and Figure 7 shown, the structure of the second cutting profile die: including the second punch 1101 and the second blanking die 1102, the second punch is symmetrically arranged on the upper die with guide hole as the center of symmetry, the second blanking die is fixed on the lower die, the blade edge on the second blanking die is symmetrically arranged; the advantages of this structure: simple structure, improve the production efficiency, is conducive to reducing production cost;

[0031] As Figure 3 , Figure 5 , Figure 6 and Figure 8 shown, the structure of the flanging die: including flanging punch 1201 and flanging die 1202, flanging punch is symmetrically arranged on the upper die with guide hole as the center of symmetry, the symmetrically arranged flanging die is fixed on the lower die corresponding to the flanging punch; the flanging die is composed of two flanging forming blocks arranged symmetrically to form a flanging forming cavity; the advantages of this structure: simple structure, improve the production efficiency, is conducive to reducing production cost;

[0032] As Figure 3 , Figure 5 , Figure 6 and Figure 8 shown, the structure of the bending die: including bending punch 1301 and bending die 1302, bending punch is symmetrically arranged on the upper die with guide hole as the center of symmetry, the symmetrically arranged bending die is fixed on the lower die corresponding to the bending punch; the structure of the bending die: including bending forming block, bending forming block and adjacent flanging forming block combine to form a bending forming cavity; the advantages of this structure: simple structure, improve the production efficiency, is conducive to reducing production cost;

[0033] As Figure 3 , Figure 5 , Figure 6 and Figure 8As shown in the figure, the structure of the slotting die: including slotting punch 1401 and slotting blanking die 1402, slotting punch fixed on the upper die holder, slotting blanking die fixed on the lower die holder corresponding to the slotting punch; The advantages of this structure: simple structure, which is conducive to reducing production cost, and is easy to maintain;

[0034] As shown in Figure 3 , Figure 5 , Figure 6 and Figure 8 , the structure of the core-pulling composite die: including a pressing die, a meshing part shaping die, a side shaping die and a finishing shaping die arranged in turn along the direction of the material belt conveying, the pressing die is used for pressing the bent plate into a pipe blank, the meshing part shaping die is used for flattening the meshing part of the pipe blank, the side shaping die is used for flattening the left and right sides of the pipe blank, and the finishing shaping die is used for pressing the pipe blank into a formed part; It also includes a core-pulling mechanism, which is used to pull out the core rod in the pressing die, the meshing part shaping die, the side shaping die and the finishing shaping die; The advantages of this structure: sharing a set of core-pulling mechanism can simplify the mold structure, and fully utilize the limited space, reduce the production cost; The multi-sequence shaping structure is beneficial to improve production efficiency, product quality and reduce production cost;

[0035] As shown in Figure 3 , Figure 5 , Figure 6 and Figure 8 , the structure of the pressing die: including pressing punch 1501, pressing die 1502 and pressing core rod 1503, the pressing punch is symmetrically arranged on the upper die holder with the guide hole as the center of symmetry, and the symmetrically arranged pressing die is fixed on the lower die holder corresponding to the pressing punch; The pressing die is composed of two symmetrically arranged pressing blocks; The pressing core rod is used to prevent the pipe blank from deforming; The advantages of this structure: simple structure, which improves the production efficiency and is conducive to reducing the production cost;

[0036] As shown in Figure 3 , Figure 5 , Figure 6 and Figure 8As shown in the figure, the structure of the engagement part shaping die: including engagement convex die 1601, engagement concave die 1602 and engagement tooth core rod 1603, the engagement convex die is symmetrically arranged on the upper die seat with the guide hole as the center of symmetry, the symmetrically arranged engagement concave die is fixed on the lower die seat corresponding to the engagement convex die; the engagement concave die is composed of two symmetrically arranged engagement tooth shaping blocks into an engagement tooth shaping cavity; the engagement tooth core rod is used to prevent the pipe blank from deforming; the advantages of this structure: simple structure, which is conducive to reducing the production cost and is convenient for maintenance; the structure of the side shaping die: including side shaping convex die, side shaping concave die and side shaping core rod, the side shaping convex die is symmetrically arranged on the upper die seat with the guide hole as the center of symmetry, the symmetrically arranged side shaping concave die is fixed on the lower die seat corresponding to the side shaping convex die; the side shaping concave die is composed of two symmetrically arranged side shaping blocks into a side shaping cavity; the side shaping core rod is used to prevent the pipe blank from deforming; the advantages of this structure: simple structure, which is conducive to reducing the production cost and is convenient for maintenance;

[0037] As shown in the figure Figure 3 , Figure 5 , Figure 6 and Figure 8 As shown in the figure, the structure of the finishing shaping die: including finishing convex die 1701, finishing concave die 1702 and finishing core rod 1703, the finishing convex die is symmetrically arranged on the upper die seat with the guide hole as the center of symmetry, the symmetrically arranged finishing concave die is fixed on the lower die seat corresponding to the finishing convex die; the finishing concave die is composed of two symmetrically arranged finishing shaping blocks into a finishing shaping cavity; the finishing core rod is used to prevent the pipe blank from deforming; the advantages of this structure: simple structure, which is conducive to reducing the production cost and is convenient for maintenance;

[0038] As shown in the figure Figure 3 , Figure 5 , Figure 6 , Figure 8 and Figure 3As shown, the core pulling mechanism is symmetrically arranged with the strip as the axis of symmetry; the core pulling mechanism comprises a driving member and an executing member; the structure of the driving member comprises a wedge-shaped block 1901 and a push rod 1902, the wedge-shaped block is fixed on the upper die holder, one end of the push rod is fixedly connected with the side surface of the wedge-shaped block, and the push rod is inclined; the structure of the executing member comprises a wedge-shaped slide 2001, a fixed bracket 2002, a return spring 2003, a front buffer pad 2004 and a rear limiting frame 2005, the wedge-shaped slide is slidingly connected with a guide rail 2006 on the lower die holder, the horizontal sliding direction of the wedge-shaped slide is the width direction of the strip, the fixed bracket is fixed in the front end cavity of the wedge-shaped slide, the fixed bracket is used for connecting the core rods in the pressing die, the engaging part shaping die, the side shaping die and the finishing shaping die and fixing the return spring, the front buffer pad is fixed on the side surface of the clamping plate of the lower die holder, the working end of the return spring is in contact with the front buffer pad, and the return spring is used to drive the wedge-shaped slide to return, and the rear limiting frame is fixed on the lower die holder; the clamping plate of the lower die holder and the rear limiting frame are used to limit the stroke of the wedge-shaped slide; one side surface of the wedge-shaped slide is provided with a guide inclined groove 2007, the guide inclined groove is slidingly matched with the other end of the push rod, and the push rod is used to first push the wedge-shaped slide; the return spring is a nitrogen spring; the structure has the advantages that the wedge-shaped structure can simplify the mechanism, occupy small space, be favorable for reducing the manufacturing cost, ensure the working stability, have long service life and be convenient to maintain;

[0039] As shown in Figure 5 , Figure 6 , Figure 8 and Figure 3 , the structure of the cutting die comprises a cutting male die 2101 and a cutting female die 2102; the structure has the advantages of simple structure, favorable reduction of manufacturing cost, convenience in maintenance and the like;

[0040] As shown in Figure 5 , the floating member 2201 is arranged in the flanging die, the bending die, the slotting die and the core pulling type compound die, and the floating member is used for floating the strip up and down; the floating member mainly comprises a spring ejector pin and an ejection block, the spring ejector pin is fixed in the lower die holder, and the ejection block is fixedly connected with the ejector pin end of the spring ejector pin; the structure has the advantages of simple structure, favorable reduction of manufacturing cost, convenience in maintenance and the like;

[0041] As shown in Figure 6 , the strip limiting assembly 2202 is arranged on the discharge end of the progressive die, and the strip limiting assembly is used for controlling the moving distance of the strip, so as to ensure the positioning accuracy and improve the stamping quality;

[0042] The upper die holder and the lower die holder mainly comprise a base plate, a pad plate and a clamping plate, and the clamping plate is mainly used for fixing the male and female dies and is fixedly connected through screws; the guide assembly mainly comprises a guide rod and a guide sleeve.

[0043] The seat headrest pipe progressive die has 13 sequences in total, and the operation contents of each sequence are as shown in the table Figure 8 Figure 3 Figure 5 Figure 6 Figure 8 Figure 3 Figure 5 Figure 6 Figure 8 Figure 9 Figure 3 Figure 5 Figure 6 Figure 8 Figure 8 Figure 8 Figure 10 and 11 2301 is a punch guide hole, 2302 is a punch guide groove, 2303 is a cutting inner edge and inner side tooth part, 2304 is a trimming of the inner edge of the material strip, 2305 is a cutting outer edge and outer side tooth part, 2306 is a plate material flanging, 2307 is a plate material bending, 2308 is a plate material slotting, 2309 is a plate material pressing into a pipe blank, 2310 is a shaping of the tooth part of the pipe blank, 2311 is a shaping of the side of the pipe blank, and 2312 is a finishing shaping of the pipe blank; 2313 is a cutting of the material strip, and 2314 is an empty working step; there is no operation content at the empty working step.

[0044] The pressing die, the tooth part shaping die, the side shaping die and the finishing shaping die, the pressing die is used for pressing the bent plate into a pipe blank, the tooth part shaping die is used for flattening the tooth part of the pipe blank, the side shaping die is used for flattening the left and right sides of the pipe blank, and the finishing shaping die is used for pressing the pipe blank into a formed piece; the structure further comprises a core pulling mechanism, which is used for pulling out the core rod in the pressing die, the tooth part shaping die, the side shaping die and the finishing shaping die; the advantages of the structure are that a set of core pulling mechanism can simplify the die structure, fully utilize the limited space and reduce the manufacturing cost; the multi-sequence shaping structure is beneficial to improve the production efficiency, product quality and reduce the production cost;

[0045] The utility model discloses a work principle: 1) material band enters the progressive die through the feeder, and passes through the punch die, the trimming die, the first cut profile die, the trimming die, the second cut profile die, the flanging die, the bending die, the slotting die, the core-pulling type compound die and the cutting die in proper order through the material band guide assembly 2203; 2) the punch die is used for punching the guide hole on the material band, the trimming die is used for punching the guide groove on the edge of the material band, the first cut profile die is used for punching the inner edge and the inner side toothed part on the material band, the trimming die is used for trimming the inner edge on the material band, and the second cut profile die is used for punching the outer edge and the outer side toothed part on the material band; 3) the material band passes through the flanging die, the bending die and the slotting die in proper order, and the plate material is obtained after flanging, bending and slotting, and the plate material is ejected from the concave die forming cavity by sharing a floating element, so that the interference between the material band and the concave die during movement is avoided; the plate material on the material band passes through the pressing die, the engaging part shaping die, the side shaping die and the finishing shaping die in proper order, and the tubular forming piece is obtained, and the floating element in the die also ejects the plate pipe material from the concave die forming cavity to the pipe blank and the forming piece; 4) the cutting die is used for separating the material band and the forming piece, and the forming piece is ejected from the positioning cavity by the spring ejector pin and falls into the material box by gravity; 5) the working principle of the core-pulling mechanism: when the die is closed, the material band pressing block on the upper die holder first presses the pipe beam into the concave groove forming cavity, then the sliding end of the push rod enters the guide inclined groove, the wedge-shaped sliding seat is pushed by the inner inclined surface of the guide inclined groove, so that the core rod is pushed into the pipe blank; at the same time, the wedge-shaped sliding seat avoids the downward wedge-shaped pressing block, so that collision is avoided; then the inclined surface of the wedge-shaped sliding seat and the wedge-shaped pressing block is contacted, and continues to descend, so that the wedge-shaped pressing block further pushes the wedge-shaped sliding seat, so that the core rod completely enters the forming cavity of the concave die; after the die is closed, the punch and the concave die complete the stamping work, and the wedge-shaped pressing block is located between the wedge-shaped sliding seat and the rear limiting frame; after the die is opened, the wedge-shaped sliding seat is reset by the reset spring, so as to drive the core rod to reset; the floating element lifts the material band, so as to eject the pipe blank and the forming piece from the concave die; 6) the forming piece is separated from the material band by the cutting die.

Claims

1. A progressive die for producing a seat headrest tube, comprising an upper die holder and a lower die holder, the upper die holder and the lower die holder being connected by a guide assembly, characterized in that: The punch dies are arranged in order between the upper die seat and the lower die seat, and are used for punching guide holes on the material belt, the trimming dies are used for punching guide grooves on the edge of the material belt, the first profile cutting dies are used for punching inner edge and inner side tooth parts on the material belt, the trimming dies are used for trimming the inner edge of the material belt, the second profile cutting dies are used for punching outer edge and outer side tooth parts on the material belt, the flanging dies are used for forming flanging parts on the plate material, the bending dies are used for forming left and right side plates on the plate material, the slotting dies are used for punching opening grooves on the plate material, the core-pulling compound dies are used for extruding the plate material into a formed part, and the cutting dies are used for separating the material belt and the formed part.

2. A progressive die for producing a seat headrest tube according to claim 1, wherein: The structure of the first profile cutting die comprises a first punch and a first blanking die. The first punch is symmetrically arranged on the upper die seat with the guide hole as the center of symmetry. The first blanking die is fixed on the lower die seat. The cutting edges on the first blanking die are symmetrically arranged.

3. The progressive die for producing a headrest pipe of a seat according to claim 1 or 2, wherein: The structure of the flanging die comprises a flanging punch and a flanging die. The flanging punch is symmetrically arranged on the upper die seat with the guide hole as the center of symmetry. The symmetrically arranged flanging dies are fixed on the lower die seat corresponding to the flanging punch. The flanging die is composed of two symmetrically arranged flanging forming blocks.

4. The progressive die for producing a headrest tube of a seat according to claim 3, wherein: The structure of the bending die comprises a bending punch and a bending die. The bending punch is symmetrically arranged on the upper die seat with the guide hole as the center of symmetry. The symmetrically arranged bending dies are fixed on the lower die seat corresponding to the bending punch. The structure of the bending die comprises a bending forming block. The bending forming block and the adjacent flanging forming block are combined to form a bending forming cavity.

5. A progressive die for producing a headrest tube for a seat as claimed in claim 1 or 2 or 4, wherein: The structure of the core-pulling compound die comprises a pressing die, a mesh part shaping die, a side shaping die and a finishing die which are sequentially arranged along the conveying direction of the material belt. The pressing die is used for pressing the bent plate part into a pipe blank. The mesh part shaping die is used for flattening the tooth part of the pipe blank. The side shaping die is used for flattening the left and right sides of the pipe blank. The finishing die is used for pressing the pipe blank into a formed part. The core-pulling mechanism is used for pulling out the core rod in the pressing die, the mesh part shaping die, the side shaping die and the finishing die.

6. A progressive die for producing a seat headrest tube as claimed in claim 5, wherein: The structure of the pressing die comprises a pressing punch, a pressing die and a pressing core rod. The pressing punch is symmetrically arranged on the upper die seat with the guide hole as the center of symmetry. The symmetrically arranged pressing dies are fixed on the lower die seat corresponding to the pressing punch. The pressing die is composed of two symmetrically arranged pressing blocks to form a pressing shaping cavity. The pressing core rod is used for preventing the pipe blank from being deformed.

7. A progressive die for producing a seat headrest tube as claimed in claim 6, wherein: The core pulling mechanism is symmetrically arranged with the material belt as the axis of symmetry; the core pulling mechanism comprises a driving member and an executing member; the structure of the driving member comprises a wedge-shaped pressing block and a push rod, the wedge-shaped block is fixed on the upper die seat, one end of the push rod is fixedly connected with the side surface of the wedge-shaped block, and the push rod is in an inclined shape; the structure of the executing member comprises a wedge-shaped sliding seat, a fixed support, a return spring, a front buffer pad and a rear limiting frame, the wedge-shaped sliding seat is slidably connected with the guide rail on the lower die seat, the fixed support is fixed in the front end cavity of the wedge-shaped sliding seat, the fixed support is used for connecting the core rod in the pressing die, the engaging part shaping die, the side shaping die and the finishing shaping die and fixing the return spring, the front buffer pad is fixed on the side surface of the clamping plate of the lower die seat, the working end of the return spring is in contact with the front buffer pad, the return spring is used for driving the wedge-shaped sliding seat to return, the rear limiting frame is fixed on the lower die seat, and the clamping plate of the lower die seat and the rear limiting frame are used for limiting the stroke of the wedge-shaped sliding seat; a guide inclined groove is arranged on one side surface of the wedge-shaped sliding seat, the guide inclined groove is slidably matched with the other end of the push rod, and the push rod is used for first pushing the wedge-shaped sliding seat; and the return spring is a nitrogen spring.

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