JP2002248526A - Progressive die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a progressive die capable of forming the drawing depth of a drawn product short such that the outer R part at the tip of the drawn product extremely small while the inner R part at the bottom of the drawn product almost rectangular without deforming the drawn product preliminarily worked in the previous drawing process. SOLUTION: A progressive die comprises a pedestal coil spring 235 mounted on a die holder 200, a pedestal 234 mounted on the pedestal coil spring 235, a third and a fourth knock-out supporting pins 232, 233 abutting against a third and a fourth knock-outs 228, 229 for supporting them provided in a second die plate 222, and a pair of timing pins 236 arranged on the pedestal 234 in a standing state, the tip of which is arranged on the feed line height of the material 10 being formed, extending to a place close to the lower surface of a second stripper plate 223.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a progressive type structure for progressively drawing a workpiece by drawing.

[0002]

2. Description of the Related Art FIG. 4 is an explanatory view showing a schematic structure of a conventional progressive type. The progressive die shown in this figure is a die having a lower movable stripper structure, and includes a first block for a first drawing step,
The subsequent block is divided into a second block having a drawing step and a forming step. In this forming step, the drawing depth of the drawn product processed in the pre-drawing step is shortened, the outer R portion (corner) at the tip of the drawing is extremely small, and the inner R portion at the base of the drawing opening is formed substantially at a right angle. It is for processing.

In the drawing, reference numeral 300 denotes a punch holder shared by the first block and the second block, and 311 denotes a first punch backing plate on the first block side, which is attached to the lower surface of the punch holder 300. Reference numeral 312 denotes a first punch plate attached to the lower surface of the first punch backing plate 311, and reference numeral 313 denotes a punch attached to the first punch plate 312 for a first drawing step.

[0004] Reference numeral 314 denotes a first stripper plate disposed below the first punch plate 312. For example, when a workpiece 10 is pressed against a first die plate, which will be described later, both ends of the lower surface in the longitudinal direction are the first die plate. The cross section in the width direction is formed in an inverted U-shape so as to contact the plate. The first stripper plate 314 has a punch guide hole 31 through which a punch 313 for the first drawing process is inserted.
4a are formed. 315 is a punch holder 300
The first coil springs 316 disposed at four places inside the first coil spring 315 project downward by the elastic force of the first coil springs 315 to support the first stripper plate 314.
It is a support pin.

[0005] Reference numeral 321 denotes a second punch backing plate on the second block side, which is attached to the lower surface of the punch holder 300. Reference numeral 322 denotes a second punch plate attached to the lower surface of the second punch backing plate 321; 323, a punch for the second drawing process mounted on the second punch plate 322; and 324, a punch for the third drawing process. Reference numeral 325 denotes a punch for the fourth drawing step. 326 is a punch for the first molding process, and 327 is a second punch.
It is a punch for a molding process. As shown in FIG. 6, the punches 326 and 327 for the first and second molding steps
The drawing depth of the drawn product drawn by the drawing process punch 325 is gradually reduced, the outer R portion (corner) at the tip of the drawing is extremely small, and the inner R portion at the base of the drawing opening is substantially perpendicular. It is for molding to become.

[0006] Reference numeral 400 denotes a die holder shared by the first block and the second block, which is provided below and opposite to the punch holder 300 described above. Reference numeral 411 denotes a first die backing plate on the first block side.
0. 412 is a first die backing plate 411 attached to a first die backing plate 411.
It is a die plate.

Reference numeral 421 denotes a second die backing plate on the second block side, which is attached to the upper surface of the die holder 400. 422 is a second die plate attached to the upper surface of the second die backing plate 421, 42
Reference numeral 3 denotes a second stripper plate disposed on the upper surface side of the workpiece 10 set at the feed line height, and both ends of the lower surface in the longitudinal direction contact the second die plate 422 in the same manner as the first stripper plate 314 described above. The cross section in the width direction is formed in an inverted U-shape. A plurality of punch guide holes 423a through which the punches 323 to 327 are inserted are formed in the second stripper plate 423.

Reference numeral 424 denotes third coil springs disposed at four places in the die holder 400, and 425 denotes third coil springs 42.
Four third support pins projecting upward with elasticity of four and supporting the second stripper plate 423. 426 is a first knockout provided in the second die plate 422 so as to face the punch 324 for the third drawing process, and 427 is provided in the second die plate 422 so as to face the punch 325 for the fourth drawing process. The second knockout 428 provided faces the punch 326 for the first forming step, and the third knockout 429 provided in the second die plate 422 faces the punch 327 for the second forming step. This is a fourth knockout provided in the die plate 422.

Reference numeral 430 denotes a first knockout coil spring provided in the stacked die holder 400 and the second backing plate 421, and reference numeral 431 denotes a second knockout coil spring provided adjacent to the first knockout coil spring 430. 432 is a third knockout coil spring, 433 is a fourth knockout coil spring, and these third and fourth knockout coil springs 432, 43
No. 3 has an elasticity against a pressing force of 400 kg or more.

Next, the operation of the conventional progressive type constructed as described above will be described with reference to FIG. FIG. 5 is an explanatory view showing the operation of the conventional progressive type. The press ram (not shown) is lowered from the top dead center and the punch holder 30 is moved.
As the value of 0 decreases, the first stripper plate 314 on the first block side lowers the workpiece 10 installed at the feed line height as shown in FIG.
12 and the second punch plate 3 on the second block side.
22 contacts the second stripper plate 423. At this time, the punches 323 to 327 on the second block side pass through the punch guide holes 423a in order of the punch length,
Each of the drawn products processed on the workpiece 10 is entered.

When the press ram further descends and reaches the bottom dead center, the punch 313 for the first drawing step on the first block side is moved to the punch guide hole 3 as shown in FIG.
14a, the workpiece 10 is pressed and drawn, while the second stripper plate 4 on the second block side is pressed.
23 presses the workpiece 10 down to the second die plate 422. At this time, the second stripper plate 423
Punches 323 to 32 on the second block side that have been lowered
7 presses each of the drawn products into the second die plate 422 for processing. The first of the punches 323 to 327
The drawn product formed by the forming process punch 326 is:
The tip of the drawn product (see FIG. 6A) processed by the punch 325 for the fourth drawing process is formed such that the distal end portion is extended in the radial direction and the drawn depth is short (see FIG. b)
), The drawn product formed by the punch 327 for the second forming process has an inner R portion at the base of the drawing opening substantially at a right angle and an outer R portion at the tip portion extremely small as shown in FIG. It is molded.

[0012]

However, in the above-described conventional progressive type, the second punch plate 32 is moved downward by the punch holder 300 as shown in FIG.
2 contacts the second stripper plate 423, the first
And the punches 326 and 327 for the second molding step are in the drawn product. Therefore, in particular, the third knockout 428
The upper drawn product had a shape crushed by the pressing force of the punch 326 for the first forming step and the elasticity (spring pressure) of the third knockout 428 as shown in FIG. The deformed drawn product is formed into a predetermined shape in the second die plate 422 as described with reference to FIG. 5B, but if the crushed state is large, the punch 326 for the first forming process is formed.
When it was formed by the method, the drawn product was shaved, damaged or constricted.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to shorten the drawing depth of a drawn product without deforming the drawn product processed in a pre-drawing process, and to reduce the outer radius of the drawing tip. It is an object of the present invention to provide a progressive die that is extremely small and can form the inside R portion of the throttle opening base portion at a substantially right angle.

[0014]

(1) A progressive die according to the present invention is provided with a punch holder and a plurality of punch holders provided on the side of the punch holder for sequentially feeding a workpiece and repeatedly processing a drawn product. A drawing punch, a forming punch provided on the punch holder side, for forming a predetermined shape by shortening the drawing depth of a drawn product processed by the punch, and provided below and facing the punch holder. A die holder and a stripper plate that is movably provided on the die holder side and moves the workpiece to the die holder side as the punch holder descends to the die holder side. A die plate provided on the upper surface side of the die holder, and a knockout provided in the die plate so as to face the molding punch, The operation of the stripper plate to be depressed by the lowering of the punch holder side is obtained and means for pulling the knockout on the die holder side.

[0015] In the present invention, when each drawn product of the progressively processed workpiece is processed by a plurality of drawing punches and a forming punch, a knockout provided opposite to the forming punch is operated by a stripper plate. , The drawn product formed by the forming punch is not crushed by the forming punch and the knockout. No scraping, damage or constriction occurred.

(2) In the progressive die according to the present invention, in the above (1), the means is arranged so that, before the drawn product of the work material descending with the stripper plate comes into contact with the knockout in the die plate, The knockout is pulled down to the die holder side.

In the present invention, before the drawn product processed by the former drawing punch contacts the knockout in the die plate, the knockout is pulled down to the die holder side. Molded in the die plate without being crushed by knockout.

(3) In the progressive die according to the present invention, in (1), the means is provided on an elastic material provided on the die holder, a pedestal provided on the elastic material, and a pedestal. A knockout support pin that abuts against the lower surface of the knockout provided in the die plate and supports the knockout; and a lower surface of a stripper plate that stands on the pedestal and has a tip arranged at a feed line height of the workpiece. And a timing pin extending to the vicinity.

In the present invention, when the timing pin is pushed down due to the drop of the stripper plate, the pedestal presses the elastic material with the fall of the timing pin, and the knockout support pin provided on the pedestal goes down to move the knockout support pin in the die plate. Lower knockout. At this time, the drawn product immediately below the forming punch is housed in the die plate without being crushed by the forming punch and the knockout, and is formed by the forming punch. As a result, the drawing depth of the drawn product is short, the outer R portion at the tip of the drawing is extremely small, and
The inside R portion of the throttle opening base is formed at a substantially right angle.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram showing a schematic configuration of a progressive type according to an embodiment of the present invention. The progressive die of the present embodiment has, for example, a lower die movable stripper structure, and is divided into a first block for a first drawing step and a second block for a subsequent drawing step and a forming step. This forming step shortens the drawing depth of the drawn product processed in the pre-drawing step as described above, and reduces the outer radius R of the drawing tip.
The portion (corner) is extremely small, and the inside R portion of the base portion of the aperture opening is formed at a substantially right angle.

In the figure, reference numeral 100 denotes a punch holder shared by the first block and the second block, and 111 denotes a first punch backing plate on the first block side, which is attached to the lower surface of the punch holder 100. Reference numeral 112 denotes a first punch plate attached to the lower surface of the first punch backing plate 111, and reference numeral 113 denotes a punch attached to the first punch plate 112 for a first drawing step.

Reference numeral 114 denotes a first stripper plate disposed below the first punch plate 112. For example, when the workpiece 10 is pressed against a later-described first die plate, both ends of the lower surface in the longitudinal direction are the first die plate. The cross section in the width direction is formed in an inverted U-shape so as to contact the plate. The first stripper plate 114 has a punch guide hole 11 through which a punch 113 for a first drawing process is inserted.
4a are formed. 115 is the punch holder 100
The first coil springs 116 disposed at four locations inside the first coil springs 116 project downward by the elasticity of the first coil springs 115 to support the first stripper plate 114.
It is a support pin.

Reference numeral 121 denotes a second punch backing plate on the second block side, which is attached to the lower surface of the punch holder 100. 122 is a second punch plate disposed with a gap below the second punch backing plate 121, 123 is a punch for the second drawing process attached to the second punch plate 122, and 124 is a third punch.
Reference numeral 125 denotes a punch for the drawing step, and reference numeral 125 denotes a punch for the fourth drawing step. Reference numeral 126 denotes a punch for the first molding step,
Denotes a punch for the second molding step. These first and second
The punches 126 and 127 for the forming process sequentially reduce the drawing depth of the drawn product drawn by the punch 125 for the fourth drawing process as described in the conventional example, and the outer R portion (corner) at the tip end of the drawing. ) Is extremely small, and the inside R portion of the throttle opening base portion is formed to be substantially perpendicular.

Reference numeral 128 denotes second coil springs disposed at four places in the punch holder 100, and 129 denotes second coil springs 1
Four second support pins projecting downward with elasticity of 28 and supporting the second stripper plate 122.

Reference numeral 200 denotes a die holder shared by the first block and the second block, which is provided below and opposite to the punch holder 100 described above. Reference numeral 211 denotes a first die backing plate on the first block side.
0. Reference numeral 212 denotes a first die backing plate attached to the upper surface of the first die backing plate 211.
It is a die plate.

Reference numeral 221 denotes a second die backing plate on the second block side, which is attached to the upper surface of the die holder 200. 222 is a second die plate attached to the upper surface of the second die backing plate 221;
Reference numeral 3 denotes a second stripper plate disposed on the upper surface side of the workpiece 10 set at the feed line height. For example, both ends of the lower surface in the longitudinal direction are the same as the first stripper plate 114 on the first block side. The cross section in the width direction is formed in an inverted U-shape so as to contact the die plate 222. The second stripper plate 223 has a plurality of punch guide holes 223a through which the punches 123 to 127 are inserted.

Reference numeral 224 denotes third coil springs disposed at four locations in the die holder 200, and 225 denotes third coil springs 22.
Four third support pins protruding upward by the elasticity of 4 and supporting the second stripper plate 223. The elasticity of the third coil spring 224 described above is, for example, a force enough to support the weight of the second stripper plate 223 and the third support pin 225, and is approximately one of the elasticity of the second coil spring 128 provided on the upper die set 100. It is about / 10.

Reference numeral 226 denotes a first knockout provided in the second die plate 222 so as to face the punch 124 for the third drawing step, and 227 denotes a second die plate 222 which faces the punch 125 for the fourth drawing step. The second knockout 228 provided in the second die plate 222 faces the punch 126 for the first molding step, and the second knockout 229 faces the punch 127 for the second molding step. A fourth knockout provided in the second die plate 222.

Reference numeral 230 denotes a first knockout coil spring provided in the stacked die holder 200 and the second backing plate 221, and reference numeral 231 denotes a second knockout coil spring provided adjacent to the first knockout coil spring 230. 232 is a third knockout support pin that supports the third knockout 228, and 233 is a fourth knockout support pin that supports the fourth knockout 229, and is attached to the base 234, respectively. 235
Is a pedestal coil spring provided in the lower die 200 and has an elasticity against a pressing force of, for example, 400 kg or more.

Reference numeral 236 denotes, for example, a pair of timing pins erected on the pedestal 234. When the tip is pressed by the lowering of the second stripper plate 223, the pedestal 234 is pushed down to cause the third and third pins in the second die plate 222. 4 Lower knockouts 228 and 229. This is because the drawn product of the workpiece 10 pushed down by the second stripper plate 223 is formed in the second die plate 222.

Next, the operation of the progressive type of the embodiment configured as described above will be described with reference to FIGS.
When the punch ram (not shown) descends from the top dead center and the punch holder 100 starts to descend, as shown in FIG. 2A, the first stripper plate 114 on the first block side of the punch holder 100 raises the feed line height. The second stripper plate 223 on the second block side comes into contact with the workpiece 10 installed on the second block side, and has the same height as the second stripper plate 223 on the second block side.
7 pass through the punch guide holes 223a of the second stripper plate 223 in order of the punch length, and
Into each of the squeezed products. At this time, each punch 123-1
The second punch plate 122 fixing the second 27 contacts the second stripper plate 223. At this point, the second punch backing plate 1 on the second block side
The interval between 21 and the second punch plate 122 is almost the same as before the punch holder 100 is lowered.

When the punch holder 100 is further lowered from the state described above, the first stripper plate 114 on the first block side lowers the workpiece 10 provided at the feed line height as shown in FIG. On the other hand, the second stripper plate 223 on the second block side pushes down the workpiece 10 against the elasticity of the third coil spring 224 by the pressing force from the second punch plate 122 to remove each drawn product from the second stripper plate 223. Each of the bases 234 starts to be inserted into the die plate 222, and comes into contact with the tip of the timing pin 236.
Is pressed down against the elasticity of the pedestal coil spring 235.

At this time, the drawn product of the workpiece 10 into which the punch 124 for the third drawing process has been inserted is turned against the first knockout 226 against the elasticity of the first knockout coil spring 230.
Is pressed down, the drawn product of the workpiece 10 into which the punch 125 for the fourth drawing process is inserted presses down the second knockout 227 against the elasticity of the second knockout coil spring 231, and the third and fourth knockouts 228, 229 Pedestal 2
34, that is, moves downward in synchronization with the fall of the timing pin 236. At this point, the drawn product into which the punches 126 and 127 for the first and second molding processes have been inserted, respectively, is inserted into the second die plate 222 without contacting the third and fourth knockouts 228 and 229. .

When the press ram is further lowered, FIG.
As shown in (a), the first stripper plate 114 on the first block contacts the first die plate 212 and the second stripper plate 22 on the second block at the same time.
3 contacts the second die plate 222. At this time, the third
And the fourth knockouts 228 and 229 are stopped at predetermined positions, and each drawing product on the second block side is
3 to 127.

When the press ram further descends and reaches the bottom dead center, the second punch backing plate 121 on the second block side contacts the second punch plate 122 via the workpiece 10. At this time, the punch 113 for the first drawing process on the first block side presses the workpiece 10 to form the first drawn product, and the outer periphery (flange) of the mouth of each drawn product on the second block side is formed. The second stripper plate 223 and the second
The flatness is corrected by the die plate 222.

Thereafter, although not shown, the press ram rises from the bottom dead center to the top dead center and the punch holder 100
Is pulled up to a predetermined position. When the punch holder 100 is pulled up to a predetermined position, the first coil spring 115 on the first block side returns while pressing the first stripper plate 114 via the first support pin 116, and
The second coil spring 128 on the second block side returns while pressing the second punch plate 122 via the second support pin 129. At this time, the punch 113 for the first drawing process on the first block side is removed from the first drawn product, and the second punch backing plate 121 on the second block side is separated from the second punch plate 122.

With the rise of the punch holder 100, the first
The first stripper plate 114 on the block side is raised, and the second punch plate 1 on the second block side is lifted.
22 is lifted, the third side of the die holder 200 is
The coil spring 224 pushes up the second stripper plate 223 via the third support pin 225, and accordingly, the pedestal coil spring 235 causes the pair of timing pins 236 and the third and fourth knockout pins 232 via the pedestal 234.
233 is lifted to remove the first and second molded products from the die plate 122 upward. By such a series of operations, the workpiece 10 is raised to the feed line height.

When the workpiece 10 is pushed up to the height of the feed line, the pair of timing pins 236 separate from the second stripper plate 223, and
When 0 further increases, the first stripper plate 114 on the first block side moves away from the workpiece 10, and the second punch plate 122 on the second block side moves away from the second stripper plate 223. At this time, the punches 123 to 127 on the second block side are
22 and the second stripper plate 2
It comes out of each punch guide hole 223a formed in 23.

As described above, in the present embodiment, when the pair of timing pins 236 are pushed down by the lowering of the second stripper plate 223, the pedestal 234 is moved by the lowering of the timing pins 236 to the pedestal coil spring 2
35, the third and fourth knockout support pins 232, 233 provided on the pedestal 234 are lowered, and the third and fourth knockouts 228 in the second die plate 222 are lowered.
229 and lower each punch 1 for the first and second molding steps.
The squeezed product immediately below 26, 127 is passed through the second die plate 2
22 so that the drawn product is not crushed on the third and fourth knockouts 228 and 229. Therefore, the drawing depth of the drawn product is reduced, and the outer radius of the drawing tip is reduced. Is extremely small, and the inside R portion of the throttle opening base portion can be formed substantially at a right angle.

In this embodiment, the pedestal 23
4 and the timing pin 236 and the third and fourth knockout support pins 232 and 233 are separately formed, but the pedestal 234 and the timing pin 236 or the pedestal 234 and the third and fourth knockout support pins 232 and 23 are provided.
Third, or pedestal 234 and timing pin 236 and third,
The pedestal may be formed by integrally forming the fourth knockout support pins 232 and 233, and the same effect as described above can be obtained.

[0041]

As described above, according to the present invention, when each drawn product of a progressively fed workpiece is processed by a plurality of drawing punches and forming punches, the drawn products are provided to face the forming punches. The knockout is pulled down to the die holder side by the operation of the stripper plate, so that the drawn product formed by the forming punch is not crushed by the forming punch and the knockout. Squeezed parts that may occur when
There is an effect that a product having a predetermined shape can be provided without breakage or constriction.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a progressive feeding type according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operation of a progressive type in the embodiment.

FIG. 3 is an explanatory diagram of an operation of a progressive type following FIG. 2;

FIG. 4 is an explanatory diagram showing a schematic configuration of a conventional progressive type.

FIG. 5 is an explanatory diagram of an operation of a conventional progressive type.

FIG. 6 is an explanatory view of a drawn product formed by the punches for the first and second forming steps.

FIG. 7 is an explanatory diagram of a drawn product before being formed by the punches for the first and second forming steps.

[Explanation of symbols]

Reference Signs List 100 punch holder 112 first punch plate 113 punch for first drawing step 114 first stripper plate 115 first coil spring 116 first support pin 122 second punch plate 123 to 125 punch for second drawing step to fourth drawing step Punch 126 for the first forming step 127 punch for the second forming step 128 second coil spring 129 second support pin 200 die holder 212 first die plate 222 second die plate 223 second stripper plate 224 third coil spring 225 Third support pin 226 to 229 First knockout to fourth knockout 230 First knockout coil spring 231 Second knockout coil spring 232 Third knockout support pin 233 Fourth knockout support pin 234 Pedestal 235 units Seat coil spring 236 Timing pin

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Sonozu 3-3-5 Yamato, Suwa City, Nagano Prefecture Inside Seiko Epson Corporation (72) Tomo Takahashi 3-3-5 Yamato Suwa City, Nagano Prefecture Seiko Epson F term (reference) inside 4E090 AA01 AB01 EC04 FA01 HA03

Claims (3)

[Claims] 1. A punch holder, a plurality of drawing punches provided on the punch holder side for sequentially feeding a workpiece and repeatedly processing a drawn product, and the punches provided on the punch holder side. A forming punch for shortening the drawing depth of the drawn product processed by the method to form a predetermined shape, a die holder provided below and facing the punch holder, and movable to the die holder side. A die plate provided on the upper surface side of the die holder, wherein the workpiece is provided with a stripper plate that moves the workpiece to the die holder side as the punch holder moves down to the die holder side. A knockout provided in the die plate so as to face the molding punch; Means for pulling down the knockout to the die holder side by the operation of the stripper plate being lowered. 2. The apparatus according to claim 1, wherein the knocking-out device pulls down the knockout to the die holder before the drawn product of the workpiece descending with the stripper plate comes into contact with the knockout in the die plate. 1
The progressive type described. 3. The apparatus according to claim 1, wherein said means includes an elastic member provided on said die holder, a pedestal provided on said elastic material, and a lower surface of said knockout provided on said pedestal and provided in said die plate. A knockout support pin that abuts and supports the knockout, and a timing pin that stands upright on the pedestal and whose tip extends to near the lower surface of the stripper plate disposed at the feed line height of the workpiece. The progressive type according to claim 1, wherein: