CN114653830A - Stamping die and process with negative-angle flanging stamping part - Google Patents

Abstract

The invention discloses a stamping die with negative angle flanging stamping parts and a process, wherein the stamping die comprises a blanking die, a flanging and negative angle folding composite die, a bending die and a punching die, the blanking die, the flanging and negative angle folding composite die, the bending die and the punching die are arranged on a group of punching machines which are arranged in a production line, when the stamping process is implemented, a strip-shaped material sheet is placed on the blanking die to be blanked to obtain a blanking material sheet, and the blanking material sheet is sequentially formed on the flanging and negative angle folding composite die, the bending die and the punching die to obtain the flanging and negative angle folding parts, the bending parts and the final negative angle flanging stamping parts. The invention has ingenious conception and compact layout, adopts reverse thinking, keeps the position of the lateral flanging insert stationary, realizes the process from vertical flanging to negative angle flanging by the up-and-down movement of the sheet metal part, realizes the negative angle flanging forming by one set of die, reduces the number of die sets and reduces the manufacturing cost.

Description

Stamping die and process with negative-angle flanging stamping part

Technical Field

The invention relates to the technical field of forming dies for stamping parts, in particular to a stamping die with negative-angle flanging stamping parts and a process.

Background

At present, along with the improvement of consumer to using product matching nature and security performance consciousness, for reaching good matching nature between the punching press part and improving the purpose of product self intensity, more and more product parts develop towards the direction from the welding, and the punching press that has the negative angle turn-ups brought from this is also more and more. The stamping forming has the advantages of short forming time, high forming quality, low die cost and the like, so the stamping forming is widely applied, particularly in the field of automobiles, but the stamping part with the negative angle flanging cannot be stamped at one time by adopting the forming process and the die in the prior art. Common stamping die is generally all through increasing mould quantity and process, and the in-process of sheet metal component from perpendicular turn-ups to negative angle turn-ups keeps the sheet metal component position motionless, adopts ordinary slider formula slide wedge mechanism to realize processing. However, the negative-angle flanging stamping method is also accompanied by the following steps: firstly, adding a mould and working procedures; secondly, the complexity of the structure of the die is increased; the cost of the stamping die is increased greatly invisibly, and for small parts with compact structures, the space is limited, and complex structures cannot be arranged, so that negative-angle flanging is difficult to realize.

How to develop the forming die of one shot forming negative angle turn-ups part realizes that one set of mould accomplishes negative angle turn-ups operation, has both practiced thrift mould cost and has reduced later stage mould use maintenance cost, becomes the technological problem that technical staff in the field had a urgent need to solve.

Disclosure of Invention

The invention aims to provide a stamping die with a negative-angle flanging stamping part, which can be processed without increasing the working procedures and the number of dies and a slide block type wedge mechanism, can realize negative-angle flanging in a smaller space, greatly reduces the cost, ensures that the whole product is more economical on the premise of meeting the quality requirement, and solves the technical problems of higher processing cost and complex design structure of the sheet metal part with the negative angle of the lateral flanging in the prior art.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention discloses a stamping die with negative angle flanging stamping parts, which comprises a blanking die, a flanging and negative angle folding composite die, a bending die and a punching die, wherein the blanking die, the flanging and negative angle folding composite die, the bending die and the punching die are arranged on a group of punching machines which are arranged in a production line, strip-shaped material pieces are placed on the blanking die to be punched to obtain blanking material pieces, and the blanking material pieces are sequentially molded on the flanging and negative angle folding composite die, the bending die and the punching die to obtain flanging and negative angle folding parts, bending parts and final negative angle flanging stamping parts.

Further, the blanking die comprises a first lower die assembly and a first upper die assembly, the first lower die assembly comprises a first lower die holder and a blanking and punching convex-concave die, the blanking and punching convex-concave die is connected to a first lower die fixing plate, the first lower die fixing plate is connected to the first lower die holder, and a first guide element and a first stopper are arranged on two sides of the top surface of the first lower die holder; first last mould subassembly includes first upper die base and blanking die, the blanking die with install first upper fixing plate and first backing plate between the first upper die base, the blanking die is connected on the first backing plate, the center of blanking die is provided with presses the flitch, press the flitch to pass through connecting screw and second spring coupling and be in on the first upper die base.

Furthermore, the blanking die also comprises a punching structure and an unloading assembly, the punching structure comprises a first punching male die and a punching groove positioned on the blanking punching male die and the blanking punching female die, and the first punching male die is connected to the blanking female die; the discharging assembly comprises a first discharging plate and a first spring, the first discharging plate is connected to a first lower die base through a discharging screw, the first spring is sleeved on the discharging screw, and the blanking punching convex-concave die is embedded in the middle of the first discharging plate and can be in sliding fit with the first discharging plate; and the first discharging plate is connected with a positioning pin for positioning the strip-shaped material sheet.

Further, the flanging and negative angle folding composite die comprises a second lower die assembly and a second upper die assembly, the second lower die assembly comprises a second lower die base, a lower fixing frame, a negative angle folding insert and a lower die forming insert, a lower backing plate and a supporting plate are sequentially connected above the second lower die base, the negative angle folding insert and the lower die forming insert are embedded into the lower fixing frame and then connected onto the supporting plate, a first material supporting core is arranged in a space defined by the negative angle folding insert, the lower die forming insert and the lower fixing frame, the bottom of the first material supporting core is connected onto the second lower die base through a first nitrogen spring, and the first material supporting core is in sliding fit with the negative angle folding insert, the lower die forming insert and the lower fixing frame; a second guide element and a second limiting stopper are connected to the two sides of the top surface of the second lower die holder; the second upper die component comprises a second upper die base, an upper fixed frame, a material pressing core and an upper die flanging insert, wherein the upper fixed frame is connected to the second upper die base through a second base plate, the material pressing core is connected to the second upper die base through a material pressing core spring and a connecting bolt, the upper die flanging insert is connected to the second upper die base through an insert spring and a connecting bolt, the upper die flanging insert is distributed on the second base plate, the two sides of the material pressing core are inserted, the material pressing core is embedded into the upper die flanging insert in the upper fixed frame and in sliding fit with the upper fixed frame.

Furthermore, guide plates are connected to the front and rear side surfaces of the material pressing core, and the guide sliding surfaces of the guide plates are matched with the front and rear surfaces of the through hole in the upper fixing frame; the initial pressure of the first nitrogen spring is larger than the sum of the bending force at the negative bending angle position and the final pressure of the material pressing core spring.

Furthermore, the first material supporting core and the upper die flanging insert are matched with each other to form a negative corner edge part of the flanging and negative corner folding piece, and the lower die forming insert and the upper die flanging insert are matched with each other to form a flanging edge part of the flanging and negative corner folding piece.

Further, the bending die comprises a third lower die assembly and a third upper die assembly, the third lower die assembly comprises a third lower die base, a bending die fixing frame and a bending flanging insert, the bending die fixing frame is connected to the third lower die base through a bending die lower cushion plate, the bending flanging insert is embedded into the bending die fixing frame and then connected to the bending die lower cushion plate, a second material supporting core is arranged on one side of the bending flanging insert, the second material supporting core is connected to the third lower die base through a second nitrogen spring, and a third guide element and a third limiting stopper are connected to two sides of the top surface of the third lower die base; the third upper die assembly comprises a third upper die base and a bending flanging male die, and the bending flanging male die is connected to the third upper die base through a third base plate.

Furthermore, the second is held in the palm the top surface middle of material core and is provided with the locating piece, the second holds in the palm the both sides of material core and is provided with the anticreep apron, the anticreep apron is connected on the fixed frame of mould of bending and spacing side with the side that the material core was held in the palm to the second cooperatees.

Further, the punching die comprises a fourth lower die assembly and a fourth upper die assembly, the fourth lower die assembly comprises a fourth lower die seat, a symbol block and a punching concave die sleeve, the symbol block is connected to the fourth lower die seat, the punching concave die sleeve is installed at the punching position of the symbol block, a fourth guide element and a fourth limiter are installed on two sides of the top surface of the fourth lower die seat, a waste material box is arranged below the fourth lower die seat, and a lifting rod is connected to the side surface of the fourth lower die seat; the fourth upper die assembly comprises a fourth upper die base and a second punching male die, the second punching male die is installed on a second upper die fixing plate, the second upper die fixing plate is connected to the fourth upper die base through a fourth base plate, the working end of the second punching male die penetrates through a second discharging plate, and the second discharging plate is connected to the fourth upper die base through a discharging spring and a discharging screw; four inner guide columns penetrate through four corners of the second discharging plate and are connected to the fourth base plate in a positioning mode.

A stamping process with negative-angle flanging stamping parts adopts the stamping die with the negative-angle flanging stamping parts, and comprises the following steps:

the method comprises the following steps: arranging material sheets, designing the shape and size of the blanking material sheets according to the shape and the forming performance of the product, and arranging the blanking material sheets on the strip-shaped material sheets;

step two: blanking and punching, namely, adopting a blanking die to blank and obtain a blanking material sheet after the first lower die assembly and the first upper die assembly are closed;

step three: forming a negative angle flanging, namely adopting a flanging and negative angle folding composite die, matching a lower die forming insert, a first material supporting core and an upper die flanging insert to respectively form a flanging part and a negative angle part of a main body in one step after a second lower die assembly and a second upper die assembly are closed, and obtaining a flanging and negative angle folding piece;

step four: bending and forming, namely forming bending characteristics to obtain a bent piece after the third lower die assembly and the third upper die assembly are assembled by adopting a bending die;

step five: and punching, namely forming four holes in one side surface of the bent piece by adopting the punching die after the fourth lower die assembly and the fourth upper die assembly are assembled to obtain the final product negative-angle flanging stamping part.

Compared with the prior art, the invention has the beneficial technical effects that:

the invention relates to a stamping die with a negative angle flanging stamping part and a process, wherein the stamping die mainly comprises four sets of a blanking die, a flanging and negative angle folding compound die, a bending die and a punching die, and the dies are arranged on a group of punching machines in an assembly line arrangement when in use. According to the invention, through the flanging and negative angle folding composite die, the vertical flanging of the sheet metal part is realized by increasing and adjusting the relative motion among all the working parts in the first-order die, and then the working process of the negative angle flanging is realized, so that one-time completion of the negative angle flanging forming operation by one set of die is realized.

The invention has the advantages of ingenious concept and compact layout, adopts the reverse thinking, keeps the position of the lateral flanging insert stationary, realizes the process from vertical flanging to negative angle flanging by the up-and-down movement of the sheet metal part, realizes the negative angle flanging molding by one set of die, can realize in a smaller space, reduces the number of die sets, reduces the manufacturing cost and meets the product quality requirement.

Drawings

The invention is further illustrated in the following description with reference to the drawings.

FIG. 1 is a schematic view of a drop-punch die of the present invention;

FIG. 2 is a second spring mounting schematic of the upper die portion of the drop-punch die of the present invention;

FIG. 3 is a schematic view of a flanging negative-angle-folding composite die of the present invention;

FIG. 4 is a schematic view of a first nitrogen spring mounting of the lower die portion of the flanging negative-angle compound die of the present invention;

FIG. 5 is a schematic view of a spring mounting of a swage core of an upper die portion of the flanging negative-angle compound die according to the present invention;

FIG. 6 is a schematic view of the mold opening and part taking state of the flanging negative-angle compound mold of the present invention;

FIG. 7 is a schematic view of the die-sinking and feeding state of the flanging and negative angle folding composite die of the invention;

FIG. 8 is a schematic view of the flanging negative-angle compound die of the present invention in a compressed state;

FIG. 9 is a schematic view of the flanging and negative angle folding composite die in a vertical flanging state;

FIG. 10 is a schematic view of the flanging and negative angle folding composite die in a preliminary negative angle flanging state;

FIG. 11 is a schematic view of the flanging negative-angle-folded composite die of the present invention in a state of completing the negative-angle flanging;

FIG. 12 is a schematic view of a bending mold according to the present invention;

FIG. 13 is a schematic view of a punch die of the present invention;

FIG. 14 is a schematic view of the discharge spring mounting of the upper die portion of the punch die of the present invention;

FIG. 15 is a schematic layout of a blanking web of the present invention;

FIG. 16 is a schematic view of a stamping forming process with negative angle burring of the present invention;

FIG. 17 is a schematic view of another embodiment of the composite mold of the present invention;

description of reference numerals: 100. blanking a die; 101. a first guide member; 102. a first stopper; 103. a first lower die fixing plate; 104. a first spring; 105. a first stripper plate; 106. positioning pins; 107. blanking and punching a convex-concave die; 108. a first lower die holder; 109. a first upper die holder; 110. a first backing plate; 111. a first upper die fixing plate; 112. blanking female dies; 113. a first piercing punch; 114. a second spring; 115. a material pressing plate;

200. flanging and folding the negative angle composite die; 201. a second lower die holder; 202. A second stopper; 203. a lower base plate; 204. a support plate; 205. a lower fixed frame; 206: negative angle folding insert blocks; 207. forming an insert of the lower die; 208. a first nitrogen spring; 209. a first material supporting core; 210. a second guide member; 211. a second upper die holder; 212. a second backing plate; 213. an upper fixing frame; 214. a guide plate; 215. a swage core spring; 216. pressing the material core; 217. an upper die flanging insert; 218. an insert spring;

300. bending the die; 301. a third stopper; 302. a third guide member; 303. bending a lower backing plate of the die; 304. fixing frames of the bending die; 305. bending the flanging insert; 306. a second material supporting core; 307. an anti-falling cover plate; 308. a second gas spring; 309. positioning a block; 310. a third lower die holder; 311. a third upper die holder; 312. Bending the flanging male die; 313. a third base plate;

400. punching a die; 401. a fourth lower die holder; 402. a fourth stopper; 403. a symbol block; 404. punching a female die sleeve; 405. a waste material box; 406. a fourth guide member; 407. lifting the lifting rod; 408. a fourth upper die holder; 409. a fourth base plate; 410. a second upper die fixing plate; 411. a discharge spring; 412. a second piercing punch; 413. an inner guide post; 414. a second stripper plate;

500. strip-shaped material sheets; 5-1, blanking tablets; 5-2, flanging and folding the negative angle piece; 5-3, bending pieces; 5-4, and negative angle flanging stamping parts.

Detailed Description

As shown in fig. 1-17, a stamping die with negative angle flanging stamping parts comprises a blanking die 100, a flanging and negative angle folding composite die 200, a bending die 300 and a punching die 400, wherein the blanking die 100, the flanging and negative angle folding composite die 200, the bending die 300 and the punching die 400 are mounted on a group of punching machines arranged in a flow line, a strip-shaped material sheet 500 is placed on the blanking die 100 to be punched to obtain a blanking sheet 5-1, and the blanking sheet 5-1 is sequentially formed on the flanging and negative angle folding composite die 200, the bending die 300 and the punching die 400 to obtain flanging and negative angle folding parts 5-2, bending parts 5-3 and final negative angle flanging stamping parts 5-4.

As shown in fig. 1-2, the blanking and punching die 100 includes a first lower die assembly and a first upper die assembly, the first lower die assembly includes a first lower die holder 108 and a blanking and punching punch-die 107, the blanking and punching punch-die 107 is connected to a first lower die fixing plate 103, the first lower die fixing plate 103 is connected to the first lower die holder 108, and a first guide element 101 and a first stopper 102 are mounted on two sides of the top surface of the first lower die holder 108; first last mould subassembly includes first upper die base 109 and blanking die 112, blanking die 112 with install first upper die fixing plate 111 and first backing plate 110 between the first upper die base 109, blanking die 112 is connected on the first backing plate 110, blanking die 112's center is provided with presses flitch 115, it connects through connecting screw and second spring 114 to press flitch 115 on the first upper die base 109. Specifically, the first guiding elements 101 and the first stoppers 102 are distributed on the opposite surfaces of the first lower die holder 108 and the first upper die holder 109, and the upper and lower positions are in one-to-one correspondence.

Specifically, the blanking die 100 further comprises a punching structure and an unloading assembly, the punching structure comprises a first punching male die 113 and a punching groove located on the blanking punching male-female die 107, and the first punching male die 113 is connected to the blanking female die 112; the discharging assembly comprises a first discharging plate 105 and a first spring 104, the first discharging plate 105 is connected to a first lower die holder 108 through a discharging screw, the first spring 104 is sleeved on the discharging screw, and the blanking punching punch die 107 is embedded in the middle of the first discharging plate 105 and is in slidable fit with the first discharging plate 105; the first stripper plate 105 is attached with positioning pins 106 for positioning the strip-shaped material sheet 500.

In operation, in the state of opening the mold, the strip-shaped material sheet 500 is placed on the first discharging plate 105 and positioned in the three positioning pins 106, then the first upper mold assembly descends, and the material pressing plate 115 firstly contacts the strip-shaped material sheet 500 and is pressed on the first discharging plate 105; the first upper die holder 109 continues to descend, and when the die is closed, the blanking and punching operation is realized through the matching of the blanking and punching convex-concave die 107, the blanking concave die 112 and the first punching convex die 113, so that a blanking sheet 5-1 is formed; then the first upper die assembly moves upwards to return to the top dead center, after the die is opened, the first discharging plate 105 is reset under the action of the first spring 104, the blanking material sheet 5-1 is jacked up and falls on the blanking punching convex-concave die 107 under the action of the second spring 114 by the pressure plate 115, and the operator takes out the blanking material sheet 5-1 and transfers the blanking material sheet to the punching die of the next process.

As shown in fig. 3 to 11, the flanging and negative-angle folding composite die 200 includes a second lower die assembly and a second upper die assembly, the second lower die assembly comprises a second lower die holder 201, a lower fixed frame 205, a negative folding angle insert 206 and a lower die forming insert 207, a lower backing plate 203 and a support plate 204 are sequentially connected above the second lower die holder 201, the negative angle folding insert 206 and the lower die forming insert 207 are embedded in the lower fixing frame 205 and then connected to the support plate 204, a first material supporting core 209 is arranged in a space enclosed by the negative angle folding insert 206, the lower die forming insert 207 and the lower fixing frame 205, the bottom of the first material supporting core 209 is connected to the second lower die holder 201 through a first nitrogen spring 208, the first material supporting core 209 is in sliding fit with the negative angle folding insert 206, the lower die forming insert 207 and the lower fixing frame 205, and the first material supporting core 209 and the second lower die holder 201 can move relatively when the first nitrogen spring 208 is compressed; a second guide element 210 and a second stopper 202 are connected to two sides of the top surface of the second lower die holder 201; the second upper die assembly comprises a second upper die holder 211, an upper fixed frame 213, a material pressing core 216 and an upper die flanging insert 217, the upper fixed frame 213 is connected to the second upper die holder 211 through a second backing plate 212, the material pressing core 216 is connected to the second upper die holder 211 through a material pressing core spring 215 and a connecting bolt, the upper die flanging insert 217 is connected to the second backing plate 212 through an insert spring 218 and a connecting bolt, the upper die flanging insert 217 is distributed on two sides of the material pressing core 216, and the material pressing core 216 and the upper die flanging insert 217 are embedded into the upper fixed frame 213 and can be in sliding fit with the upper fixed frame 213; specifically, the swaging core 216 and the upper die flanging insert 217 move together with the second upper die holder 211, and due to the design of the swaging core spring 215 and the insert spring 218, the swaging core 216 and the upper die flanging insert 217 move relative to the second upper die holder 211.

Specifically, the front side and the rear side of the material pressing core 216 are connected with guide plates 214, and the guide sliding surfaces of the guide plates 214 are matched with the front side and the rear side of the through hole in the upper fixed frame 213, so that the flexible and reliable movement of the material pressing core 216 is ensured; the initial pressure of the first nitrogen spring 208 is greater than the sum of the bending force at the negative angle position and the final pressure of the plunger spring 215. The first material supporting core 209 and the upper die flanging insert 217 are matched to form a negative corner edge part of the flanging negative corner folding piece 5-2, and the lower die forming insert 207 and the upper die flanging insert 217 are matched to form a flanging edge part of the flanging negative corner folding piece 5-2.

As shown in fig. 7, in the mold opening and feeding state, a flat blanking sheet 5-1 is placed on the first carrier core 209, and after the feeding is completed, the second upper mold assembly moves downward to start the mold closing operation.

As shown in fig. 8, the blank sheet 5-1 is in a compressed state: the second upper die assembly moves downwards, the pressing core 216 and the upper die flanging insert 217 move together with the second upper die holder 211, the pressing core 216 is in contact with the blanking sheet 5-1 and is matched with the first material supporting core 209 to press the blanking sheet 5-1, the pressing core 216 presses the blanking sheet 5-1 under the action of the elastic force of a pressing core spring 215 and the self gravity of the pressing core spring and the action of the initial pressure of the first nitrogen spring 208 on the first material supporting core 209, and the pressing core spring 215 and the first nitrogen spring 208 are in an uncompressed state during initial pressing.

As shown in fig. 9, the sheet metal part is in a vertical flanging state: the second upper die holder 211 continues to move downwards, the material pressing core spring 215 starts to compress and gradually reaches a final pressure state, the material pressing core 216 is in contact with the second base plate 212 to reach a blocking state, the first nitrogen spring 208 is not compressed at the moment, the upper die flanging insert 217 continues to move downwards along with the second upper die holder 211, the first material supporting core 209 is kept still, and the process part completes vertical flanging under the combined action of the upper die flanging insert 217 and the first material supporting core 209.

As shown in fig. 10 and 11, the negative angle flanging process is as follows: the second upper die holder 211 continues to move downwards, the first material supporting core 209 is acted by the rigidity force of the second upper die assembly, so that the first nitrogen spring 208 starts to be compressed, the material pressing core 216 and the upper die flanging insert 217 move along with the second upper die holder 211, the working piece moves downwards along with the first material supporting core 209, when the vertical side wall of the working piece contacts the negative angle folding insert 206, the negative angle folding action starts, the working piece finishes the negative angle folding action under the combined action of the first material supporting core 209, the negative angle folding insert 206, the upper die flanging insert 217 and the material pressing core 216, and when the second lower die assembly and the second upper die assembly are completely closed, the negative angle folding operation is finished.

As shown in fig. 6, opening the mold to take out the part: and the second upper die assembly moves upwards and returns, when the second upper die assembly is completely separated from the second lower die assembly, the first material supporting core 209 and the material pressing core 216 are movably released, the first nitrogen spring 208 and the material pressing core spring 215 are reset, when the second upper die base 211 reaches a top dead center, the die is opened in place, and an operator uses a tool to draw out the formed process piece, namely the flanging and negative-folding corner piece 5-2 from one side in the front. And after the workpiece is taken out, repeating the operations to start the flanging negative angle stamping operation of the next workpiece.

As shown in fig. 12, the bending mold 300 includes a third lower mold assembly and a third upper mold assembly, the third lower mold assembly includes a third lower mold base 310, a bending mold fixing frame 304 and a bending flanging insert 305, the bending mold fixing frame 304 is connected to the third lower mold base 310 through a bending mold lower cushion plate 303, the bending flanging insert 305 is embedded into the bending mold fixing frame 304 and then connected to the bending mold lower cushion plate 303, a second material supporting core 306 is disposed on one side of the bending flanging insert 305, the second material supporting core 306 is connected to the third lower mold base 310 through a second gas spring 308, and a third guide element 302 and a third stopper 301 are connected to two sides of a top surface of the third lower mold base 310; the third upper die assembly comprises a third upper die holder 311 and a bending flanging male die 312, and the bending flanging male die 312 is connected to the third upper die holder 311 through a third base plate 313.

Specifically, a positioning block 309 is arranged in the middle of the top surface of the second material supporting core 306, anti-falling cover plates 307 are arranged on two sides of the second material supporting core 306, and the anti-falling cover plates 307 are connected to the fixing frame 304 of the bending die and matched with the side edges of the second material supporting core 306 on the limiting side.

When the mould is in operation, in the mould opening state, the second nitrogen spring 308 is in a free return state, the second material supporting core 306 is jacked up, the molded surface of the second material supporting core is higher than that of the bent flanging insert block 305, and the flanging bent negative angle piece 5-2 (a process piece) formed in the second process is placed on the second material supporting core 306 and is accurately and reliably positioned through the positioning block 309; after feeding, the third upper die assembly starts to move downwards, when the bending flanging male die 312 starts to contact the flanging negative angle folding part 5-2, the whole bending flanging action starts to work, the third upper die assembly continues to move downwards, and the bending flanging male die 312 and the second material supporting core 306 tightly press the working part; the second gas spring 308 starts to be compressed on the basis of the acting force of the third upper die assembly, the second material supporting core 306 starts to move downwards, the bending flanging insert 305 starts to contact a working piece, and the whole bending action starts to be carried out under the combined action of the bending flanging male die 312 and the bending flanging insert 305. When the third limiters 301 of the upper die and the lower die are contacted, the whole bending and flanging process is finished; and then, the third upper die assembly starts to move upwards and returns to the top dead center, the die is opened after forming, the second material supporting core 306 starts to move upwards under the action of the second nitrogen spring 308, the formed bent piece 5-3 is supported, the whole forming process is finished, and an operator takes out the formed bent piece 5-3 to prepare for punching work of the last process.

The bending die 300 is a single-side flanging die, in order to solve the single-side flanging stress of the die, the bending flanging male die 312 is abutted against the side surface step of the third backing plate 313, and the third backing plate 313 is implanted into the third upper die base 311 in a four-side over-fit manner, so that the shearing force born by the connection of screws and pins for connecting the bending flanging male die 312 is reduced.

As shown in fig. 13 to 14, the punching die 400 includes a fourth lower die assembly and a fourth upper die assembly, the fourth lower die assembly includes a fourth lower die holder 401, a character block 403 and a punching female die sleeve 404, the character block 403 is connected to the fourth lower die holder 401, the punching female die sleeve 404 is installed at the punching position of the character block 403, a fourth guide element 406 and a fourth stopper 402 are installed on two sides of the top surface of the fourth lower die holder 401, a waste box 405 is disposed below the fourth lower die holder 401, and a lifting rod 407 is connected to a side surface of the fourth lower die holder 401; the fourth upper die assembly comprises a fourth upper die holder 408 and a second punching male die 412, the second punching male die 412 is mounted on a second upper die fixing plate 410, the second upper die fixing plate 410 is connected to the fourth upper die holder 408 through a fourth backing plate 409, the working end of the second punching male die 412 penetrates through a second discharging plate 414, and the second discharging plate 414 is connected to the fourth upper die holder 408 through a discharging spring 411 and a discharging screw; four inner guide posts 413 penetrate through four corners of the second discharging plate 414, and the inner guide posts 413 are positioned and connected to the fourth base plate 409. Specifically, the fourth guiding elements 406 and the fourth stoppers 402 are distributed on the fourth lower die holder 401 and the fourth upper die holder 408, and the upper and lower positions of the fourth guiding elements and the fourth stoppers correspond to each other one by one.

When the mould is in work, the bent piece 5-3 obtained in the previous procedure is firstly placed on the conformal block 403 in the mould opening state, and the placing and taking-out states of the bent piece 5-3 must move back and forth and cannot move up and down due to the negative angle of the product; after the bent piece 5-3 is placed stably, the fourth upper die assembly starts to move downwards, the second stripper plate 414 firstly contacts the bent piece 5-3 and is tightly pressed on a working piece on the lower die character block 403 along with the continuation of the movement, and the inner guide pillar 413 plays a role in accurately guiding the movement of the second stripper plate 414, so that the stability of the movement and the accuracy of the punching operation are ensured; then, as the downward movement of the fourth upper die assembly continues, the second punching male die 412 starts to cooperate with the punching female die sleeve 404 to realize the function of punching at four positions, and punching waste falls in the waste box 405, so that the waste is convenient to collect; when the fourth stoppers 402 of the upper die and the lower die are contacted, the fourth upper die assembly moves to a lower dead point, the fourth upper die assembly starts to move upwards, the upper die spring unloading spring 411 starts to release and drives the second unloading plate 414 to move downwards to unload the final product negative angle flanging stamping part 5-4 from the second punching male die 412, the negative angle flanging stamping part 5-4 is buckled on the symbol block 403, the fourth upper die assembly continues to move to the upper dead point, the whole punching and stamping process is finished, and an operator drives the negative angle flanging stamping part 5-4 to move towards the positive front direction through the workpiece taking tool and takes out the workpiece.

In addition, as shown in fig. 17, for another embodiment of the flanging negative-angle compound die 200, when the side flanging of the sheet metal part is vertical flanging or is close to vertical flanging, the upper material pressing core 216, the upper die flanging insert 217, the material pressing core spring 215 and the insert spring 218 in the structure of the above embodiment can be eliminated, and the upper die insert is uniformly designed and installed on the second upper die holder 211 and moves along with the second upper die holder 211, so that the second upper die assembly can be regarded as a whole, the structure is simpler, and the manufacturing cost is lower. Wherein the upper fixing frame 213 and the second pad plate 212 are selectively designed and installed as required.

As shown in fig. 15-16, taking an example of a mounting bracket of an ESC actuator assembly of an automobile, a stamping process with a negative-angle flanging stamping part adopts the stamping die with the negative-angle flanging stamping part, and specifically includes the following steps:

the method comprises the following steps: the material sheet arrangement, in order to ensure the shape and size of the formed edges and holes to be accurate and save raw materials, the shape and size of the blanking material sheet 5-1 are designed according to the shape and forming performance of the product and arranged on the strip-shaped material sheet 500, as shown in fig. 15, the arrangement mode maximizes the utilization rate of the raw materials;

step two: blanking and punching, namely, adopting a blanking die 100 to blank and obtain a blanking material sheet 5-1 after the first lower die assembly and the first upper die assembly are closed;

step three: negative angle flanging molding, namely adopting a flanging and negative angle folding composite die 200, and after a second lower die assembly and a second upper die assembly are closed, matching a lower die molding insert 207, a first material supporting core 209 and an upper die flanging insert 217 to mold a flanging part and a negative angle part of a main body respectively at one time to obtain a flanging and negative angle part 5-2;

step four: bending and forming, namely forming bending characteristics to obtain a bent piece 5-3 after the third lower die assembly and the third upper die assembly are assembled by adopting a bending die 300;

step five: and punching, namely, adopting a punching die 400 to form four holes on one side surface of the bent piece 5-3 after the fourth lower die assembly and the fourth upper die assembly are closed, so as to obtain a final product, namely the negative-angle flanging stamping piece 5-4.

The stamping process of the stamping part with the negative-angle flanging, provided by the invention, comprises the steps of designing the shape and size of a blanking material sheet 5-1 according to the shape and the forming performance of a product, arranging the blanking material sheet on a strip-shaped material sheet 500, and then sequentially carrying out four working procedures of blanking and punching, flanging and folding a negative angle, bending and punching by adopting a blanking die 100, a flanging and folding negative angle compound die 200, a bending die 300 and a punching die 400 to obtain a qualified part meeting the requirement of drawing tolerance, namely the negative-angle flanging stamping part 5-4.

The stamping part with the negative angle flanging can be adaptively adjusted by referring to the flanging negative angle folding composite die structure, and the stamping technological process can be adaptively adjusted by referring to the design of the invention.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the present invention.

Claims (10)

1. The utility model provides a stamping die with negative angle turn-ups stamping workpiece which characterized in that: the blanking die comprises a blanking die (100), a flanging and negative angle folding composite die (200), a bending die (300) and a punching die (400), wherein the blanking die (100), the flanging and negative angle folding composite die (200), the bending die (300) and the punching die (400) are arranged on a group of punching machines which are arranged in a production line, a strip-shaped material sheet (500) is placed on the blanking die (100) to be punched to obtain a blanking material sheet (5-1), and the blanking material sheet (5-1) is sequentially formed on the flanging and negative angle folding composite die (200), the bending die (300) and the punching die (400) to obtain a flanging and negative angle folding part (5-2), a bending part (5-3) and a final negative angle flanging and punching part (5-4).

2. The stamping die with negative angle flanging stamping parts as claimed in claim 1, wherein: the blanking and punching die (100) comprises a first lower die assembly and a first upper die assembly, the first lower die assembly comprises a first lower die holder (108) and a blanking and punching convex-concave die (107), the blanking and punching convex-concave die (107) is connected to a first lower die fixing plate (103), the first lower die fixing plate (103) is connected to the first lower die holder (108), and a first guide element (101) and a first stopper (102) are mounted on two sides of the top surface of the first lower die holder (108); first last mould subassembly includes first upper die base (109) and blanking die (112), blanking die (112) with install first upper die fixing plate (111) and first backing plate (110) between first upper die base (109), blanking die (112) are connected on first backing plate (110), the center of blanking die (112) is provided with presses flitch (115), press flitch (115) to connect through connecting screw and second spring (114) on first upper die base (109).

3. The stamping die with negative angle flanging stamping parts as claimed in claim 2, wherein: the blanking and punching die (100) further comprises a punching structure and an unloading assembly, the punching structure comprises a first punching male die (113) and a punching groove positioned on the blanking and punching male-female die (107), and the first punching male die (113) is connected to the blanking female die (112); the discharging assembly comprises a first discharging plate (105) and a first spring (104), the first discharging plate (105) is connected to a first lower die holder (108) through a discharging screw, the first spring (104) is sleeved on the discharging screw, and the blanking punching punch male-female die (107) is embedded in the middle of the first discharging plate (105) and is in slidable fit with the first discharging plate (105); the first discharging plate (105) is connected with a positioning pin (106) for positioning the strip-shaped material sheet (500).

4. The stamping die with negative angle flanging stamping parts as claimed in claim 1, wherein: the flanging negative angle folding composite die (200) comprises a second lower die assembly and a second upper die assembly, the second lower die assembly comprises a second lower die seat (201), a lower fixing frame (205), a negative angle folding insert (206) and a lower die forming insert (207), a lower backing plate (203) and a supporting plate (204) are sequentially connected above the second lower die seat (201), the negative angle folding insert (206) and the lower die forming insert (207) are embedded into the lower fixing frame (205) and then connected onto the supporting plate (204), a first material supporting core (209) is arranged in a space surrounded by the negative angle folding insert (206), the lower die forming insert (207) and the lower fixing frame (205), the bottom of the first material supporting core (209) is connected onto the second lower die seat (201) through a first nitrogen spring (208), and the first material supporting core (209) and the negative angle folding insert (206), The lower die forming insert (207) and the lower fixing frame (205) are in sliding fit; the two sides of the top surface of the second lower die holder (201) are connected with a second guide element (210) and a second stopper (202); the second upper die component comprises a second upper die base (211), an upper fixed frame (213), a material pressing core (216) and an upper die flanging insert (217), wherein the upper fixed frame (213) is connected to the second upper die base (211) through a second base plate (212), the material pressing core (216) is connected to the second upper die base (211) through a material pressing core spring (215) and a connecting bolt, the upper die flanging insert (217) is connected to the second base plate (212) through an insert spring (218) and a connecting bolt, the upper die flanging insert (217) is distributed on two sides of the material pressing core (216), and the material pressing core (216) and the upper die flanging insert (217) are embedded into the upper fixed frame (213) and are in sliding fit with the upper fixed frame (213).

5. The stamping die with the negative-angle flanging stamping part according to claim 4, characterized in that: the front side and the rear side of the material pressing core (216) are connected with guide plates (214), and the sliding guide surfaces of the guide plates (214) are matched with the front side and the rear side of the through hole in the upper fixed frame (213); the initial pressure of the first nitrogen spring (208) is larger than the sum of the bending force at the negative angle position and the final pressure of the material pressing core spring (215).

6. The stamping die with negative angle flanging stamping parts as claimed in claim 4, wherein: the first material supporting core (209) and the upper die flanging insert (217) are matched to form a negative corner edge part of the flanging and folding negative corner piece (5-2), and the lower die forming insert (207) and the upper die flanging insert (217) are matched to form a flanging part of the flanging and folding negative corner piece (5-2).

7. The stamping die with negative angle flanging stamping parts as claimed in claim 1, wherein: the bending die (300) comprises a third lower die assembly and a third upper die assembly, the third lower die assembly comprises a third lower die base (310), a bending die fixing frame (304) and a bending flanging insert (305), the bending die fixing frame (304) is connected to the third lower die base (310) through a bending die lower backing plate (303), the bending flanging insert (305) is embedded into the bending die fixing frame (304) and then connected to the bending die lower backing plate (303), a second material supporting core (306) is arranged on one side of the bending flanging insert (305), the second material supporting core (306) is connected to the third lower die base (310) through a second nitrogen spring (308), and a third guide element (302) and a third limiter (301) are connected to two sides of the top surface of the third lower die base (310); the third upper die component comprises a third upper die holder (311) and a bending flanging male die (312), and the bending flanging male die (312) is connected to the third upper die holder (311) through a third base plate (313).

8. The stamping die with negative angle flanging stamping parts as claimed in claim 7, wherein: the middle of the top surface of the second material supporting core (306) is provided with a positioning block (309), two sides of the second material supporting core (306) are provided with anti-falling cover plates (307), the anti-falling cover plates (307) are connected to the fixing frame (304) of the bending die and limit sides of the anti-falling cover plates are matched with the sides of the second material supporting core (306).

9. The stamping die with negative angle flanging stamping parts as claimed in claim 1, wherein: the punching die (400) comprises a fourth lower die assembly and a fourth upper die assembly, the fourth lower die assembly comprises a fourth lower die seat (401), a symbol block (403) and a punching female die sleeve (404), the symbol block (403) is connected to the fourth lower die seat (401), the punching female die sleeve (404) is installed at the punching position of the symbol block (403), a fourth guide element (406) and a fourth stopper (402) are installed on two sides of the top surface of the fourth lower die seat (401), a waste box (405) is arranged below the fourth lower die seat (401), and the side surface of the fourth lower die seat (401) is connected with a lifting rod (407); the fourth upper die assembly comprises a fourth upper die holder (408) and a second punching male die (412), the second punching male die (412) is installed on a second upper die fixing plate (410), the second upper die fixing plate (410) is connected to the fourth upper die holder (408) through a fourth backing plate (409), the working end of the second punching male die (412) penetrates through a second discharging plate (414), and the second discharging plate (414) is connected to the fourth upper die holder (408) through a discharging spring (411) and a discharging screw; four inner guide posts (413) penetrate through four corners of the second discharging plate (414), and the inner guide posts (413) are positioned and connected to the fourth base plate (409).

10. A stamping process with negative angle flanging stamping parts, characterized in that the stamping die with negative angle flanging stamping parts of any one of claims 1-9 is adopted, and the stamping process comprises the following steps:

the method comprises the following steps: the material sheet arrangement is that the shape and the size of a blanking material sheet (5-1) are designed according to the shape and the forming performance of a product and are arranged on a strip-shaped material sheet (500);

step two: blanking and punching, namely, adopting a blanking die (100) to blank and obtain a blanking material sheet (5-1) after the first lower die assembly and the first upper die assembly are closed;

step three: negative angle flanging molding, namely, adopting a flanging and negative angle flanging composite die (200), matching a lower die molding insert (207), a first material supporting core (209) and an upper die flanging insert (217) to mold a flanging part and a negative angle part of a main body at one time respectively after a second lower die assembly and a second upper die assembly are closed, and obtaining a flanging and negative angle part (5-2);

step four: bending and forming, namely forming bending characteristics to obtain a bent piece (5-3) after the third lower die assembly and the third upper die assembly are assembled by adopting a bending die (300);

step five: and punching, namely adopting a punching die (400), and forming four holes on one side surface of the bent piece (5-3) after the fourth lower die component and the fourth upper die component are closed to obtain a final product negative-angle flanging stamping piece (5-4).

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