Progressive die for producing lower connecting plate of seat angle adjuster

Abstract

The utility model discloses a progressive die for producing a lower connecting plate of a seat angle adjuster. The progressive die comprises an upper die holder and a lower die holder, a first punching die, a second trimming die, a third trimming die, a fourth forming boss pressing die, a fifth flanging reducing die, a sixth trimming die, a seventh reverse drawing die, an eighth trimming flanging die, a ninth punching die, a tenth flanging die, an eleventh bending die, a twelfth tapping die and a thirteenth slitting die are sequentially arranged between the upper die base and the lower die base. The multi-station progressive compound die is combined with a tapping technology, so that the production efficiency is greatly improved, the production cost is reduced, the efficiency and the cost profit are obvious, and the stability of the dimensional accuracy of a product is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of progressive dies for automotive parts, and in particular a progressive die for producing the lower connecting plate of a seat adjuster. Background Technology

[0002] A seat adjuster is a mechanical component installed on a car seat to adjust the angle of the seat back. The seat adjuster consists of a lower connecting plate, the adjuster itself, the backrest side plate, and the lower crossbeam, which are welded together to form a backrest assembly. After foam and fabric are installed, the backrest assembly is formed. The backrest assembly and the seat cushion assembly are connected by the lower connecting plate of the adjuster. Therefore, the lower connecting plate of the adjuster is a key intermediate component connecting the backrest assembly and the seat cushion assembly.

[0003] In the automotive component connection process, bolts and nuts are common connection methods. If nuts and bolts are used to connect the mounting holes of the lower connecting plate of the angle adjuster, two spot welding processes are required on the lower connecting plate of the angle adjuster to spot weld the nuts, requiring two production workers. This results in low production efficiency, high production costs, and the risk of the nuts coming off the weld.

[0004] If conventional stamping and hole turning are used, followed by manual offline tapping, it takes 0.5 minutes to tap one hole and 1 minute to manually tap one stamped part. In an 8-hour shift, only 480 parts can be produced, resulting in low production efficiency.

[0005] like Figure 1 and Figure 2 As shown, the structure of the lower connecting plate of the seat adjuster includes a plate body 1, an upper part of the plate body with a window 2 and a snap-fit ​​arm 3 located inside the window 2, a lower part of the plate body with a left hole 4 and a right hole 5, a connecting hole 6 on the left hole and the right hole, a reinforcing part 7 for transition connection between the window 2 and the left hole and the right hole, and a left flange 8, a right flange 9 and a lower flange 10 on the plate body. Summary of the Invention

[0006] This invention provides a progressive die for producing the lower connecting plate of a seat adjuster, which solves the problems of high production cost, low production efficiency and poor product quality stability in existing production methods.

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is: a progressive die for producing the lower connecting plate of a seat adjuster, comprising an upper die base and a lower die base, which are connected by a guide assembly. Arranged between the upper and lower die bases are a first punching die, a second trimming die, a third trimming die, a fourth forming boss die, a fifth flanging and diameter reduction die, a sixth trimming die, a seventh reverse stretching die, an eighth trimming and flanging die, a ninth punching die, a tenth flanging die, an eleventh bending die, a twelfth tapping die, and a thirteenth slitting die. The first punching die is used to punch guide holes on the strip. The second trimming die, in conjunction with the first trimming die, is used to punch sheet metal on the strip. The fourth forming boss die is used to form reinforcing parts and left and right connecting hole bosses on the sheet metal. The fifth flanging and diameter reduction die is used to form... The first die forms the left and right flanged parts and reduces the diameter of the left and right connecting hole bosses. The second die is used to trim the lower side of the previous blank. The third die is used to stretch the top surfaces of the left and right connecting hole bosses in the opposite direction. The fourth die is used to trim the upper side of the sheet metal and form the lower flange on the sheet metal. The fifth die is used to punch holes and windows and holes on the top of the left and right connecting hole bosses on the sheet metal. The sixth die is used to flange the snap-fit ​​arms in the holes and shape the left and right connecting hole bosses. The eleventh die is used to bend the flanged part on the snap-fit ​​arms. The twelfth die is used to process threaded connecting holes on the connecting hole bosses and the right connecting hole boss. The thirteenth die is used to separate the strip and the formed part.

[0008] Further defining the above technical solution, the structure of the first punching die includes a punching punch fixed to the upper die base and a punching blanking die fixed to the lower die base.

[0009] Further defining the above technical solution, the structure of the second trimming die includes a second-order trimming punch fixed to the upper die base and a second-order trimming blanking die fixed to the lower die base.

[0010] To further define the above technical solution, the structure of the third trimming die includes a three-stage trimming punch fixed to the upper die base and a three-stage trimming blanking die fixed to the lower die base.

[0011] Further defining the above technical solution, the structure of the fourth forming boss mold includes a reinforcing part forming die and a reinforcing part forming punch. The reinforcing part forming die is fixed on the upper die base, and the reinforcing part forming punch is fixed on the lower die base. The reinforcing part forming die and the reinforcing part forming punch cooperate to form the reinforcing part of the part. The parting surface of the reinforcing part forming die is provided with a boss forming punch, and the parting surface of the reinforcing part forming punch is provided with a boss forming cavity.

[0012] Further defining the above technical solution, the structure of the fifth flanging and diameter reduction die includes left and right flanging punches fixed to the upper die base and left and right flanging dies fixed to the lower die base. The left and right flanging punches and dies cooperate to form the left and right flanging portions of the part. The parting surface of the left and right flanging punches is provided with diameter reduction bosses, and the parting surface of the left and right flanging dies is provided with boss diameter reduction forming cavities.

[0013] Further defining the above technical solution, the structure of the sixth trimming die includes a punch for punching the connecting hole edge fixed to the upper die base and a die for edge scrapping fixed to the lower die base. The punch for punching the connecting hole edge and the die for edge scrapping cooperate to trim the lower side edge of the previous blank.

[0014] Further defining the above technical solution, the structure of the seventh reverse stretching die includes a reinforcing positioning die fixed to the upper die base and a reinforcing positioning punch fixed to the lower die base. The parting surface of the reinforcing positioning die is provided with an extrusion die, and the parting surface of the lower reinforcing positioning punch is provided with an extrusion cavity corresponding to the extrusion punch. A reverse stretching punch is provided inside the extrusion cavity.

[0015] Further defining the above technical solution, the structure of the eighth trimming and flanging die includes a lower side flanging die and an upper side punch fixed to the upper die base, and a lower side flanging punch and an upper side blanking die fixed to the lower die base. The lower side flanging die and the lower side flanging punch cooperate to form the lower side flanging part of the previous blank, and the upper side trimming punch and the upper side trimming and blanking die cooperate to partially trim the upper side of the previous blank.

[0016] Further defining the above technical solution, the structure of the ninth punching die includes a punching positioning die, a punching window punch, a punching connecting hole punch, and a punching positioning punch. The punching positioning die is fixed on the upper die base, the punching window punch and the punching connecting hole punch are fixed on the parting surface of the punching positioning die, and the punching positioning punch is fixed on the lower die base. The parting surface of the punching positioning punch is provided with a window blanking cavity and a connecting hole blanking cavity.

[0017] Further defining the above technical solution, the structure of the tenth flanging die includes a flanging positioning die, a connecting hole shaping punch, and a flanging positioning punch. The flanging positioning die is fixed on the upper die base, the connecting hole shaping punch is fixed on the flanging positioning die, the parting surface of the flanging positioning die is provided with a flanging forming cavity, the flanging positioning punch is fixed on the lower die base, the parting surface of the flanging positioning punch is provided with a core rod cavity, a flanging core rod is provided in the core rod cavity, and the parting surface of the flanging positioning punch is provided with a connecting hole shaping cavity.

[0018] Further defining the above technical solution, the structure of the eleventh bending die includes a bending positioning die and a bending positioning punch. The parting surface of the bending positioning die is provided with a bending forming cavity, and a core-pulling mandrel is provided inside the bending forming cavity. The parting surface of the bending positioning punch is provided with a mandrel cavity, and an elastic flange positioning mandrel is provided inside the mandrel cavity. The core-pulling mandrel and the flange positioning mandrel cooperate to clamp the flanged part of the snap-fit ​​arm, and the free end of the flanged part is bent inside the bending forming cavity.

[0019] Further defining the above technical solution, the structure of the core-pulling mandrel includes a wedge-shaped slide, a mandrel, a return spring, a wedge block, and a push rod. The wedge-shaped slide is slidably connected to the guide rail of the upper mold base. The horizontal sliding direction of the wedge-shaped slide is the width direction of the material strip. The mandrel is fixed on the wedge-shaped slide. The return spring is fixed inside the upper mold base and is used to drive the wedge-shaped slide back to its original position. A guide groove is provided on one side of the wedge-shaped slide. The wedge block is fixed on the lower mold base. One end of the push rod is fixedly connected to the side of the wedge block. The push rod is inclined. The other end of the push rod is slidably engaged with the guide groove on the wedge-shaped slide. The push rod is used to push the wedge-shaped slide first.

[0020] Further defining the above technical solution, the structure of the twelfth tapping die includes a base plate, a fixed plate, a tap seat, a tap, a gearbox, a spline shaft, a transmission gear, a nut, and a lead screw. The base plate is fixed to the lower die base, and a tapping positioning part is provided at the center of the base plate. The fixed plate is fixed to the upper die base, the tap seat is fixed to the top of the fixed plate, and the gearbox is fixed to the bottom of the fixed plate. The upper end of the tap is rotatably connected to the tap seat, the outer ring teeth on the tap shank mesh with the output gear in the gearbox, and the tapping end of the tap passes through the gearbox. The upper end of the spline shaft is slidably connected to the guide hole on the gearbox, and the upper end of the spline shaft meshes with the input gear in the gearbox. The lower end of the spline shaft is connected to the bearing hole on the base. The transmission gear is fixed to the lower end of the spline shaft. The nut is fixed to the base plate through a bearing seat, the outer ring teeth on the nut mesh with the transmission gear, and the nut meshes with the lead screw. The upper end of the lead screw is fixedly connected to the upper die base through a seat.

[0021] To further define the above technical solution, the structure of the thirteenth cutting die includes a cutting punch and a blanking die.

[0022] The beneficial effects of this utility model are as follows: 1) This utility model adopts a progressive production process, which can reduce tooling investment, significantly shorten production time, reduce production costs and improve production efficiency, and ensure the stability of product dimensional accuracy; 2) The combination of multi-station progressive die compound mold and tapping technology further improves production efficiency and reduces production costs, with obvious efficiency and cost benefits. Attached Figure Description

[0023] Figure 1This is a front view of the product in the background technology;

[0024] Figure 2 This is a back view of the product in the background art;

[0025] Figure 3 This is a structural diagram of the upper die of the intermediate progressive die of this utility model;

[0026] Figure 4 This is a structural diagram of the upper die of the first punching die, the second trimming die, the third trimming die, the fourth forming boss die, the fifth flanging and diameter reduction die, and the sixth trimming die.

[0027] Figure 5 This is a structural diagram of the upper die of the seventh reverse stretching die, the eighth trimming and flanging die, the ninth punching die, the tenth flanging die, and the eleventh bending die.

[0028] Figure 6 This is a structural diagram of the lower die of the intermediate progressive die of this utility model;

[0029] Figure 7 This is a diagram of the lower die structure of the first punching die, the second trimming die, the third trimming die, the fourth forming boss die, the fifth flanging and diameter reduction die, and the sixth trimming die;

[0030] Figure 8 This is a structural diagram of the lower die of the seventh reverse stretching die, the eighth trimming and flanging die, the ninth punching die, the tenth flanging die, and the eleventh bending die.

[0031] Figure 9 This is a diagram of a core-pulling mandrel structure;

[0032] Figure 10 This is a diagram showing the usage status of the core-pulling mandrel structure;

[0033] Figure 11 This is a sectional view of the twelfth tapping mold;

[0034] Figure 12 This is a 3D model of the twelfth dental model;

[0035] Figure 13 It is a strip diagram of the material. Detailed Implementation

[0036] like Figure 3 and Figure 6As shown, a progressive die for producing a lower connecting plate of a seat adjuster includes an upper die base and a lower die base, which are connected by a guide assembly. Arranged between the upper and lower die bases are a first punching die, a second trimming die, a third trimming die, a fourth forming boss die, a fifth flanging and diameter reduction die, a sixth trimming die, a seventh reverse stretching die, an eighth trimming and flanging die, a ninth punching die, a tenth flanging die, an eleventh bending die, a twelfth tapping die, and a thirteenth slitting die. The first punching die punches guide holes in the strip. The second trimming die, in conjunction with the first trimming die, punches sheet metal from the strip. The fourth forming boss die forms a reinforcing part and a left connecting hole boss and a right connecting hole boss on the sheet metal. The fifth flanging and diameter reduction die forms a left flanging part and a right flanging part on the sheet metal. The flanging part reduces the diameter of the left and right connecting hole bosses. The sixth trimming die is used to trim the lower side of the previous blank. The seventh reverse stretching die is used to stretch the top surfaces of the left and right connecting hole bosses in the opposite direction. The eighth trimming and flanging die is used to partially trim the upper side of the sheet metal and form the lower flanging part on the sheet metal. The ninth punching die is used to punch holes and the top holes of the left and right connecting hole bosses on the sheet metal. The tenth flanging die is used to flanging the snap-fit ​​arm in the hole and to shape the left and right connecting hole bosses. The eleventh bending die is used to bend the flanging part on the snap-fit ​​arm. The twelfth tapping die is used to process threaded connecting holes on the connecting hole bosses and the right connecting hole boss. The eleventh slitting die is used to separate the strip and the formed part.

[0037] like Figure 4 and Figure 7 As shown, the structure of the first punching die includes a punching punch 1101 fixed to the upper die base and a punching blanking die 1102 fixed to the lower die base. The advantages of this structure are: simple structure, which helps to reduce manufacturing costs and is also easy to maintain.

[0038] like Figure 4 and Figure 7 As shown, the structure of the second trimming die includes a second-order trimming punch 1201 fixed to the upper die base and a second-order trimming blanking die 1202 fixed to the lower die base. The advantages of this structure are: simple structure, which helps to reduce manufacturing costs and is also easy to maintain.

[0039] like Figure 4 and Figure 7 As shown, the structure of the third trimming die is the same as that of the second trimming die, including a three-stage trimming punch 1301 fixed on the upper die base and a three-stage trimming blanking die 1302 fixed on the lower die base; the advantages of this structure are: simple structure, which helps to reduce manufacturing costs and is also easy to maintain.

[0040] like Figure 4 and Figure 7As shown, the structure of the fourth forming boss die includes a reinforcing part forming die 1401 and a reinforcing part forming punch 1402. The reinforcing part forming die is fixed on the upper die base, and the reinforcing part forming punch is fixed on the lower die base. The reinforcing part forming die and the reinforcing part forming punch cooperate to form the reinforcing part of the part. The parting surface of the reinforcing part forming die is provided with a boss forming punch 1403, and the parting surface of the reinforcing part forming punch is provided with a boss forming cavity 1404. The advantages of this structure are: simple structure, which helps to reduce manufacturing costs and is also easy to maintain.

[0041] like Figure 4 and Figure 7 As shown, the structure of the fifth flanging and diameter reduction die includes left and right flanging punches 1501 fixed to the upper die base and left and right flanging dies 1502 fixed to the lower die base. The left and right flanging punches and dies cooperate to form the left and right flanging parts of the part. The parting surface of the left and right flanging punches is provided with diameter reduction bosses 1503, and the parting surface of the left and right flanging dies is provided with boss diameter reduction forming cavities 1504. The advantages of this structure are: simple structure, which helps to reduce manufacturing costs and is also easy to maintain.

[0042] like Figure 4 and Figure 7 As shown, the structure of the sixth trimming die includes a punch 1601 fixed to the upper die base for punching the connecting hole edge and a die 1602 fixed to the lower die base for edge trimming. The punch 1601 and the die 1602 cooperate to trim the lower side edge of the previous blank. The advantages of this structure are: simple structure, which helps to reduce manufacturing costs and is also easy to maintain.

[0043] like Figure 5 and Figure 8 As shown, the structure of the seventh reverse stretching die includes a reinforcing positioning die 1701 fixed to the upper die base and a reinforcing positioning punch 1702 fixed to the lower die base. The reinforcing positioning die and the reinforcing positioning punch cooperate to clamp the previous blank. An extrusion die 1703 is provided on the parting surface of the reinforcing positioning die, and an extrusion cavity is provided on the parting surface of the lower reinforcing positioning punch corresponding to the extrusion punch. A reverse stretching punch 1704 is provided in the extrusion cavity. The advantages of this structure are: simple structure, which helps to reduce manufacturing costs and is also easy to maintain.

[0044] like Figure 5 and Figure 8As shown, the structure of the eighth trimming and flanging die includes a lower side flanging die 1801 and an upper side punch 1802 fixed to the upper die base, and a lower side flanging punch 1803 and an upper side blanking die 1804 fixed to the lower die base. The lower side flanging die 1801 cooperates with the lower side flanging punch to form the lower side flanging part of the previous blank. The upper side trimming punch cooperates with the upper side trimming and blanking die to partially trim the upper side of the previous blank, which facilitates subsequent cutting. The advantages of this structure are: simple structure, which helps to reduce manufacturing costs and is easy to maintain.

[0045] like Figure 5 and Figure 8 As shown, the structure of the ninth punching die includes a punching positioning die 1901, a punching window punch 1902, a punching connecting hole punch 1903, and a punching positioning punch 1904. The punching positioning die is fixed on the upper die base, the punching window punch and the punching connecting hole punch are fixed on the parting surface of the punching positioning die, and the punching positioning punch is fixed on the lower die base. The parting surface of the punching positioning punch is provided with a window blanking cavity 1905 and a connecting hole blanking cavity 1906. The punching positioning die and the punching positioning punch cooperate to clamp the previous blank. The advantages of this structure are: simple structure, which helps to reduce manufacturing costs and is also easy to maintain.

[0046] like Figure 5 and Figure 8 As shown, the structure of the tenth flanging die includes a flanging positioning die 2001, a connecting hole shaping punch 2002, and a flanging positioning punch 2003. The flanging positioning die is fixed on the upper die base, and the connecting hole shaping punch is fixed on the flanging positioning die. The parting surface of the flanging positioning die has a flanging forming cavity 2004. The flanging positioning punch is fixed on the lower die base, and the parting surface of the flanging positioning punch has a core rod cavity. A flanging core rod 2005 is provided in the core rod cavity, and the parting surface of the flanging positioning punch has a connecting hole shaping cavity 2006. The flanging positioning die and the flanging positioning punch cooperate to clamp the previous blank. The advantages of this structure are: simple structure, which helps to reduce manufacturing costs and is also easy to maintain.

[0047] like Figure 5 and Figure 8As shown, the structure of the eleventh bending die includes a bending positioning die 2101 and a bending positioning punch 2102. The parting surface of the bending positioning die has a bending forming cavity 2103, within which a core-pulling mandrel is provided. The parting surface of the bending positioning punch has a mandrel cavity, within which an elastic flange positioning mandrel 2104 is provided. The bending positioning die and the bending positioning punch cooperate to clamp the previous blank. The core-pulling mandrel and the flange positioning mandrel cooperate to clamp the flanged part of the clamping arm. The free end of the flanged part is bent within the bending forming cavity. Further explanation of the elastic flange positioning mandrel: the flange positioning mandrel can float up and down via a nitrogen spring, and the flange positioning mandrel is used to limit the bending direction of the flanged part. The advantages of this structure are: simple structure, which helps reduce manufacturing costs and facilitates maintenance.

[0048] like Figure 9 and Figure 10 As shown, the structure of the core-pulling mandrel includes a wedge-shaped slide 2105, a mandrel 2106, a return spring, a wedge block 2107, and a push rod 2108. The wedge-shaped slide is slidably connected to the guide rail 2109 of the upper mold base. The horizontal sliding direction of the wedge-shaped slide is the width direction of the material strip. The mandrel is fixed on the wedge-shaped slide, and the return spring is fixed inside the upper mold base. The return spring is used to drive the wedge-shaped slide back to its original position. A guide groove 2110 is provided on one side of the wedge-shaped slide. The wedge block is fixed on the lower mold base. One end of the push rod is fixedly connected to the side of the wedge block. The push rod is inclined, and the other end of the push rod is slidably engaged with the guide groove on the wedge-shaped slide. The push rod is used to push the wedge-shaped slide first. The return spring is a nitrogen spring. The advantages of this structure are: the wedge structure simplifies the mechanism, occupies less space, helps reduce manufacturing costs, ensures working stability, has a long service life, and is easy to maintain.

[0049] The working principle of the core-pulling mandrel is as follows: During mold closing, the sliding end of the push rod on the wedge block enters the guide groove, and the inner inclined surface of the guide groove first pushes the wedge slide, thereby pushing the mandrel into the bending forming cavity; at the same time, the descending wedge slide avoids the wedge block to prevent collision; then the wedge slide contacts the inclined surface of the wedge block and continues to descend, and the inclined surface causes the wedge block to further push the wedge slide, so that the mandrel is completely inserted into the forming cavity; after mold separation, the wedge slide returns to its original position through the return spring, thereby driving the mandrel to return to its original position;

[0050] like Figure 11 and Figure 12As shown, the structure of the twelfth tapping die 22 includes a base plate 2201, a fixing plate 2202, a tap seat 2203, a tap 2204, a gearbox 2205, a splined shaft 2206, a transmission gear 2207, a nut 2208, and a leadscrew 2209. The base plate is fixed to the lower die base, and a tapping positioning part 2210 is provided at the center of the base plate. The fixing plate is fixed to the upper die base, the tap seat is fixed to the top of the fixing plate, and the gearbox is fixed to the bottom of the fixing plate. The upper end of the tap is rotatably connected to the tap seat, the outer ring tooth on the tap shank meshes with the output gear in the gearbox, and the tapping end of the tap passes through the gearbox. The upper end of the splined shaft is slidably connected to the guide hole on the gearbox, and the upper end of the splined shaft meshes with the input gear in the gearbox. The lower end of the splined shaft is connected to the bearing hole on the base, and the transmission gear is fixed to the lower end of the splined shaft. At the end, the nut is fixed to the base plate via bearing seat 2211. The outer ring tooth on the nut meshes with the transmission gear, and the nut meshes with the lead screw. The upper end of the lead screw is fixedly connected to the upper mold base via seat 2212. An ejector 2213 is provided on the bottom of the base plate, which consists of an ejector pin and a nitrogen spring. A nitrogen spring is provided between the base plate and the fixed plate to achieve rapid tap return. The advantages of this structure are: the lead screw moves downward, the nut rotates, and drives the tap to rotate in sequence through the transmission gear, spline shaft, and gearbox, thereby achieving tapping; the use of a lead screw pair to generate power simplifies the mechanism, occupies little space, and ensures working stability; the use of spline shaft transmission can achieve both transmission and gearbox sliding, solving the problem of the gearbox not following the movement. This structure simplifies the mechanism, occupies little space, and ensures working stability.

[0051] As shown in the product drawing, two connecting holes need to be tapped simultaneously. Therefore, there are two sets of tap holder, tap, spline shaft, transmission gear, nut and lead screw, all sharing one gearbox. This ensures synchronous tapping, tapping accuracy, and operational stability.

[0052] like Figure 3 and Figure 6 As shown, the structure of the thirteenth cutting die includes a cutting punch 2301 and a blanking die 2302. The advantages of this structure are: simple structure, which helps to reduce manufacturing costs and is also easy to maintain.

[0053] The progressive die has a strip limiting component on the discharge end. The strip limiting component is used to control the strip movement distance, which ensures positioning accuracy and helps improve stamping quality. The progressive die has a floating component, which is used to float the strip up and down. The floating component is mainly composed of a spring ejector pin and an ejector block. The spring ejector pin is fixed in the lower die base, and the ejector block is fixedly connected to the ejector pin end of the spring ejector pin.

[0054] The upper and lower mold bases are mainly composed of a base plate, a pad plate, and a clamping plate. The clamping plate is mainly used to fix the punch and die, and the fixing connection is a screw connection. The guide assembly is mainly composed of a guide rod and a guide sleeve.

[0055] like Figure 13 As shown, the progressive die for the lower connecting plate of the seat adjuster has 13 steps. The operation content of each step on the material strip is as follows: 2401 is formed by the first punching die, 2402 by the second trimming die, 2403 by the third trimming die, 2404 by the fourth forming and pressing die, 2405 by the fifth flanging and diameter reduction die, 2406 by the sixth trimming die, 2407 by the seventh reverse stretching die, 2408 by the eighth trimming and flanging die, 2409 by the ninth punching die, 2410 by the tenth flanging die, 2411 by the eleventh bending die, 2412 by the twelfth tapping die, and 2413 by the thirteenth slitting die. Among them, step 2414 is an empty step, and there is no operation content at the empty step.

[0056] The material strip enters the progressive die through the feeder, and passes through the first punching die, the second trimming die, the third trimming die, the fourth forming boss die, the fifth flanging and diameter reduction die, the sixth trimming die, the seventh reverse stretching die, the eighth trimming and flanging die, the ninth punching die, the tenth flanging die, the eleventh bending die, the twelfth tapping die, and the eleventh slitting die in sequence through the material strip guide assembly, thus achieving continuous production.

Claims

1. A progressive die for producing a seat recliner lower connecting plate, 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 first punching die, the second trimming die, the third trimming die, the fourth forming and embossing die, the fifth flanging and reducing die, the sixth trimming die, the seventh reverse stretching die, the eighth trimming and flanging die, the ninth punching die, the tenth flanging die, the eleventh bending die, the twelfth tapping die and the thirteenth cutting die are sequentially arranged between the upper die seat and the lower die seat.

2. The progressive die for producing a lower connecting plate of a seat angle adjuster according to claim 1, wherein: The fourth forming and embossing die comprises a reinforcing part forming concave die and a reinforcing part forming convex die.

3. The progressive die for producing the lower connecting plate of the seat angle adjuster according to claim 1 or 2, wherein: The fifth flanging and reducing die comprises left and right side flanging convex dies fixed on the upper die seat and left and right side flanging concave dies fixed on the lower die seat.

4. The progressive die for producing a lower connecting plate of a seat angle adjuster according to claim 3, wherein: The seventh reverse stretching die comprises a reinforcing part positioning concave die fixed on the upper die seat and a reinforcing part positioning convex die fixed on the lower die seat.

5. The progressive die for producing the lower connecting plate of the seat angle adjuster according to claim 1 or 2 or 4, wherein: The eighth trimming and flanging die comprises a lower side flanging concave die and a upper side trimming convex die fixed on the upper die seat and a lower side flanging convex die and a upper side trimming blanking concave die fixed on the lower die seat.

6. The progressive die for producing a lower connecting plate of a seat angle adjuster according to claim 5, wherein: The structure of the eleventh bending die comprises a bending positioning concave die and a bending positioning convex die, a bending forming cavity is arranged on the parting surface of the bending positioning concave die, a core-pulling type core rod is arranged in the bending forming cavity, a core rod cavity is arranged on the parting surface of the bending positioning convex die, and an elastic flanging positioning core rod is arranged in the core rod cavity; the core-pulling type core rod and the flanging positioning core rod are used for clamping and clamping the flanging part of the arm, and the free end of the flanging part is bent in the bending forming cavity.

7. The progressive die for producing a lower connecting plate of a seat angle adjuster according to claim 6, wherein: The structure of the core-pulling type core rod comprises a wedge-shaped sliding seat, a core rod, a return spring, a wedge-shaped block and a push rod, the wedge-shaped sliding seat is slidably connected with the guide rail of the upper die seat, the horizontal sliding direction of the wedge-shaped sliding seat is the width direction of the material belt, the core rod is fixed on the wedge-shaped sliding seat, the return spring is fixed in the upper die seat and is used for driving the wedge-shaped sliding seat to return, a guide inclined groove is arranged on one side surface of the wedge-shaped sliding seat, the wedge-shaped block is fixed on the lower die seat, one end of the push rod is fixedly connected with the side surface of the wedge-shaped block, the push rod is inclined, the other end of the push rod is slidably connected with the guide inclined groove on the wedge-shaped sliding seat, and the push rod is used for pushing the wedge-shaped sliding seat first.

8. The progressive die for producing the lower connecting plate of the seat angle adjuster according to claim 1 or 2 or 4 or 6, characterized in that: The structure of the twelfth tapping die comprises a bottom plate, a fixed plate, a tap seat, a tap, a gear box, a spline shaft, a transmission gear, a nut and a lead screw, the bottom plate is fixed on the lower die seat, a tapping positioning part is arranged at the center of the bottom plate, the fixed plate is fixed on the upper die seat, the tap seat is fixed on the top of the fixed plate, the gear box is fixed on the bottom of the fixed plate, the upper end of the tap is rotatably connected with the tap seat, the outer annular teeth on the tap rod are engaged with the output gear in the gear box, the tapping end of the tap is arranged to pass out of the gear box, the upper end of the spline shaft is slidably connected with the guide hole on the gear box, the upper end of the spline shaft is engaged with the input gear in the gear box, the lower end of the spline shaft is connected with the bearing hole on the base, the transmission gear is fixed on the lower end of the spline shaft, the nut is fixed on the bottom plate through the bearing seat, the outer annular teeth on the nut are engaged with the transmission gear, the nut is engaged with the lead screw, and the upper end of the lead screw is fixedly connected with the upper die seat through the seat body.

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