CN104399768A - Z-shaped touch finger forming apparatus for high voltage switch, and its secondary forming die - Google Patents
Z-shaped touch finger forming apparatus for high voltage switch, and its secondary forming die Download PDFInfo
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- CN104399768A CN104399768A CN201410591032.3A CN201410591032A CN104399768A CN 104399768 A CN104399768 A CN 104399768A CN 201410591032 A CN201410591032 A CN 201410591032A CN 104399768 A CN104399768 A CN 104399768A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
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Abstract
The invention relates to a Z-shaped touch finger forming apparatus for a high voltage switch, and its secondary forming die. The forming apparatus comprises a primary forming die and the secondary forming die, the primary forming die cavity of the primary forming female die of the primary forming die comprises a left forming cavity, a right forming cavity and a bent forming cavity connected between the left forming die and the right forming die, and the bottoms of the left forming die and the right forming die are horizontally arranged; and the secondary forming die is used to extrude a middle product into a Z-shaped touch finger, the secondary forming die comprises a secondary forming male die, a secondary forming female die and a product fixing structure for fixing the left end of the middle product, the cavity bottom at the right end of the die cavity of the secondary forming female die is a formed inclined surface arranged inclined to the horizontal direction, the secondary forming male die a press projection, and the press projection has a contact press cooperation with the upper end of the right side of the middle product in order to make the right end of the middle product deformed to be attached to the forming inclined surface. The problem of easy resilience caused by too large primary bending forming angle of the Z-shaped touch finger is solved in the invention.
Description
Technical field
The present invention relates to Z-type fingertip shaped device used for high-voltage switch and post forming mould thereof.
Background technology
Z-type fingertip is the key components and parts in the high-voltage switch gear such as breaker, GIS electric equipment products, and its design and crudy directly have influence on the arc extinction performance of switch.The performance of Z-type fingertip is except design factor, depend primarily on material and the crudy of fingertip, the structure of Z-type fingertip is as shown in figure 12: Z-shaped fingertip 45 comprises fingertip body, the middle part of fingertip body has sweep 45-1, left blind hole 45-2 is provided with on the downside of the left end of fingertip body, be provided with right blind hole 45-3 on the downside of the right-hand member of fingertip body, the Axis Extension direction of left and right blind hole tilts to intersect, and the front and back bilateral symmetry of fingertip body is furnished with two ear 45-4 processed.At present, the Z-type fingertip that China's high-voltage switch gear uses is all that procurement cycle is long from external import, and parts cost is high, and this is that the long term growth of China's High-Voltage Electrical Appliances industry brings inconvenience.
The making of Z-type fingertip is a technical barrier of this area always, and the material of Z-type fingertip is copper, and copper is the metal of face-centered cubic lattice, changes, have higher plasticity, be suitable for extruded without ppolymorphism.Analysis is carried out from the manufacturability of part, key three positions of forming parts are left respectively, right blind hole, the ear processed of middle sweep and bilateral symmetry distribution, from without, technique is not very complicated, but due to workpiece small volume, the axis of two blind holes has the angle of certain angle, and blind hole and ear processed have required precision, analyze the flowing of metal in die cavity known, fingertip body both ends fill type mainly by the transfer of blind hole metal, a filling part for both sides ear is the transfer of right blind hole metal, a part is the transfer of left blind hole metal, from the path analysis of metal flow, the metal transfer of right blind hole is larger to the difficulty at ear place processed, therefore the filling of ear processed mainly keeps left the metal transfer at blind hole place, so the shaping of this part has certain difficulty, if also have workpiece first order buckling profile angle excessive, copper material workpiece will produce bending springback, cause the design shape and the performance requirement that are difficult to guarantee Z-type fingertip.
Summary of the invention
The object of the present invention is to provide a kind of Z-type fingertip shaped device used for high-voltage switch, to solve the excessive and resilience problem easily caused of Z-type fingertip first order buckling profile angle.
In order to solve the problem, the technical scheme of high-voltage switch Z-type fingertip shaped device of the present invention is:
Z-type fingertip shaped device used for high-voltage switch, comprise one-time-shaped mould and post forming mould, one-time-shaped mould comprises one-shot forming upper male mould and has the one-shot forming lower cavity die of one-shot forming die cavity, one-shot forming die cavity comprises left forming cavity, right forming cavity and be connected to a left side, between right forming cavity with the sweep shape adaptation of corresponding Z-type fingertip bend to die cavity, left, all be horizontally disposed with at the bottom of the chamber of right forming cavity, post forming mould comprises post forming upper male mould, the post forming lower cavity die placed for corresponding middle product and the product fixed structure for fixing middle product left end, be the profiled ramp be obliquely installed with horizontal direction at the bottom of the chamber of the die cavity right-hand member of post forming lower cavity die, post forming upper male mould have for middle product on the right side of the press-fit of upper-end contact top to make middle product right-hand member be deformed into, the top belling be attached on profiled ramp rises.
The compacted under be provided with at the bottom of the chamber of left forming cavity for the left blind hole of shaping Z-type fingertip is protruding, one-shot forming upper male mould has the upper shaping projection of the right blind hole for shaping Z-type fingertip, and one-shot forming die cavity also comprises the ear forming cavity processed of the both sides ear for shaping Z-type fingertip be connected with left forming cavity.
On described one-shot forming upper male mould, guiding movement is set with lower end for contacting the first flanging block pushing up press-fit with the epicoele opening's edge of one-shot forming die cavity, one-shot forming upper male mould is fixedly arranged on one-time-shaped mould upper bolster, is provided with the first flanging spring applying active force in downward direction to the first flanging block between one-time-shaped mould upper bolster and the first flanging block.
On described first flanging spring and one-time-shaped mould upper bolster, guiding is equipped with the first guide post, the lower end of the first guide post is fixed on described first flanging block, the upper end of the first guide post is provided with outer turning edge, and one-time-shaped mould moves down the limit with the spacing cooperation that turns edge with what limit the relative one-time-shaped mould upper bolster of the first guide post outward.
Product fixed structure comprise the die cavity left end being arranged at post forming lower cavity die with the positioning convex of the left blind hole location fit on described middle product, product fixed structure also comprise with described middle product on the left of the blank body of upper end elastic top press-fit.
Described post forming mould comprises and is installed in post forming die lower bolster on the downside of described post forming lower cavity die by clamping screw, described post forming lower cavity die is equipped with the backstay that axis extends along the vertical direction, described positioning convex is made up of described backstay upper end, post forming die lower bolster coordinates with described backstay lower end block and moves down the limit to limit backstay, described post forming upper male mould is fixedly arranged on post forming mould upper bolster, described blank body comprises the second guide post being fixedly arranged on the guide direction on described post forming mould upper bolster and extending along the vertical direction, on second guide post guiding movement be equipped with lower end for middle product on the left of the second flanging block of upper-end contact top press-fit, the the second flanging spring applying active force in downward direction to the second flanging block is provided with between post forming mould upper bolster and the first flanging block.
In the present invention, the technical scheme of post forming mould is:
The post forming mould of Z-type fingertip shaped device used for high-voltage switch, comprise post forming upper male mould, for the corresponding middle post forming lower cavity die of product placement and the product fixed structure for fixing middle product left end, be the profiled ramp be obliquely installed with horizontal direction at the bottom of the chamber of the die cavity right-hand member of post forming lower cavity die, post forming upper male mould have for middle product on the right side of the press-fit of upper-end contact top to make middle product right-hand member be deformed into, the top belling be attached on profiled ramp rises.
Product fixed structure comprise the die cavity left end being arranged at post forming lower cavity die with the positioning convex of the left blind hole location fit on described middle product, product fixed structure also comprise with described middle product on the left of the blank body of upper end elastic top press-fit.
Described post forming mould comprises and is installed in post forming die lower bolster on the downside of described post forming lower cavity die by clamping screw, described post forming lower cavity die is equipped with the backstay that axis extends along the vertical direction, described positioning convex is made up of described backstay upper end, and post forming die lower bolster coordinates with described backstay lower end block and moves down the limit to limit backstay.
Described post forming upper male mould is fixedly arranged on post forming mould upper bolster, described blank body comprises the second guide post being fixedly arranged on the guide direction on described post forming mould upper bolster and extending along the vertical direction, on second guide post guiding movement be equipped with lower end for middle product on the left of the second flanging block of upper-end contact top press-fit, be provided with the second flanging spring applying active force in downward direction to the second flanging block between post forming mould upper bolster and the first flanging block.
Beneficial effect of the present invention is: for avoiding Z-shaped fingertip one-shot forming angle excessive and easily producing the problem of bending springback in the present invention, the forming process of Z-type fingertip is divided into two steps, the first step first makes blank be shaped to middle product by one-time-shaped mould, because left, all be horizontally disposed with at the bottom of the chamber of right forming cavity, therefore in the middle of product left end bottom and be level bottom right-hand member, the left end of middle product is connected by sweep with right-hand member, then middle product is positioned over post forming mould carries out extruded, be fixed by the left end of product fixed structure to middle product, then being risen by the top belling of post forming upper male mould makes middle product right-hand member bend to final angle, there is not the excessive step of first order buckling profile angle in the forming process of whole like this Z-type fingertip, effectively can avoid metal resilience problem.
Accompanying drawing explanation
Fig. 1 is the structural representation of one-time-shaped mould in an embodiment of the present invention's Z-type fingertip used for high-voltage switch shaped device;
Fig. 2 be in Fig. 1 in the middle of product and one-shot forming lower cavity die coordinate schematic diagram;
Fig. 3 is the structural representation of one-shot forming upper male mould in Fig. 1;
Fig. 4 is that the A-A of Fig. 3 is to sectional view;
Fig. 5 is the structural representation of forming convax mould in Fig. 1;
Fig. 6 is the structural representation of post forming mould in an embodiment of Z-type fingertip shaped device of the present invention;
Fig. 7 be in Fig. 6 Z-shaped fingertip and post forming lower cavity die coordinate schematic diagram;
Fig. 8 is the top view of post forming lower cavity die in Fig. 7;
Fig. 9 is that in Fig. 6, Z-shaped fingertip coordinates schematic diagram with post forming upper male mould;
Figure 10 is the top view of post forming upper male mould in Fig. 9;
Figure 11 be in Fig. 6 the second flanging block and Z-type fingertip coordinate schematic diagram;
Figure 12 is the structural representation of Z-shaped fingertip in the present invention;
Figure 13 is the forming process figure of Z-shaped fingertip in the present invention.
Detailed description of the invention
The embodiment of Z-type fingertip shaped device used for high-voltage switch is as shown in Fig. 1 ~ 13: Z-type fingertip shaped device used for high-voltage switch comprises one-time-shaped mould and post forming mould, one-time-shaped mould comprises one-shot forming upper male mould 12 and has the one-shot forming lower cavity die 8 of one-shot forming die cavity, one-shot forming lower cavity die 8 is fixed on one-time-shaped mould die shoe 1 by first fixed structure, first fixed structure comprises the one-shot forming die lining 9 and one-shot forming die block 6 that are sheathed on one-shot forming lower cavity die 8 periphery, one-shot forming die lining 9 and one-shot forming lower cavity die 8 cone match, one-shot forming die lining 9, one-shot forming die block 6 is fixed on one-time-shaped mould die shoe 1 by soket head cap screw 2.One-shot forming upper male mould 12 is by one-shot forming punch retainer 14, on one-shot forming punch, liner plate 15 is fixed on one-shot forming upper bolster 16, one-shot forming die shoe is furnished with four the first leads 19 around circumferential interval, one-shot forming upper bolster is furnished with around circumferential interval four respectively guiding movement be sheathed on the first fairlead 18 on corresponding first lead, the peripheral guiding movement of one-shot forming upper male mould is set with lower end for contacting the first flanging block pushing up press-fit with the epicoele opening's edge of one-shot forming die cavity, the the first flanging spring 13 applying active force in downward direction to the first flanging block is provided with between one-time-shaped mould upper bolster and the first flanging block, the first guide post 17 is coated with between one-time-shaped mould upper bolster and the first flanging spring, the lower end of the first guide post is fixed on described first flanging block, the upper end of the first guide post is provided with outer turning edge, one-time-shaped mould moves down the limit with the spacing cooperation that turns edge with what limit the relative one-time-shaped mould upper bolster of the first guide post outward, first flanging block comprises the working portion 10 be secured by bolts in the coupling part and 11 of the first guide post spinning on the downside of coupling part, the lower end of working portion is used for contacting with the epicoele opening's edge of one-shot forming die cavity pushing up press-fit.One-shot forming die cavity comprises left forming cavity, right forming cavity and be connected to a left side, between right forming cavity with the sweep 45-1 shape adaptation of corresponding Z-type fingertip bend to die cavity, left, all be horizontally disposed with at the bottom of the chamber of right forming cavity, the compacted under be provided with at the bottom of the chamber of left forming cavity for the left blind hole 45-2 of shaping Z-type fingertip is protruding, the upper end of the forming convax mould 7 that compacted under projection is extended along the vertical direction by the axis be threaded onto in one-shot forming lower cavity die 8 is formed, one-shot forming upper male mould 23 has upper shaping protruding 22 of the right blind hole 45-3 for shaping Z-type fingertip, one-shot forming die cavity also comprises ear forming cavity processed that is that be connected with left forming cavity and both sides ear shape adaptation that is described Z-type fingertip, for molding the both sides ear 45-4 of Z-type fingertip 45 before ear processed is shaping.Fig. 1 middle term 3 represents push rod; Item 4 represents the first alignment pins; Item 5 represents one-shot forming die lower bolsters.
Post forming mould comprises post forming upper male mould 31, for the middle post forming lower cavity die 28 of product 20 placement and the product fixed structure for fixing middle product 20 left end, post forming lower cavity die 28 is fixed on post forming mould die shoe 23 by post forming die lower bolster 25, post forming die block 26, post forming mould die shoe 23, is coated with the clamping screw 24 that axis extends along the vertical direction between post forming die lower bolster 25 and post forming die block 26.Post forming upper male mould is fixed on post forming mould upper bolster 40 by post forming punch retainer 32, post forming punch upper padding plate 34, post forming mould die shoe is furnished with four the second leads 44 around circumferential interval, post forming upper bolster is furnished with around circumferential interval four respectively guiding movement be sheathed on the second fairlead 41 on corresponding second lead.Product fixed structure comprise the die cavity left end being arranged at post forming lower cavity die with the positioning convex of the left blind hole location fit on described middle product, product fixed structure also comprise with middle product on the left of the blank body of upper end elastic top press-fit, post forming lower cavity die is equipped with the backstay 26 that axis extends along the vertical direction, positioning convex is made up of backstay 26 upper end, and post forming die lower bolster 25 coordinates with backstay 26 lower end block and moves down the limit to limit backstay.Blank body comprises the second guide post 30 that the guide direction be fixedly arranged on post forming mould upper bolster extends along the vertical direction, on second guide post guiding movement be equipped with lower end for middle product on the left of the second flanging block 29 of upper-end contact top press-fit, be provided with the second flanging spring 33 applying active force in downward direction to the second flanging block between post forming mould upper bolster and the first flanging block.At the bottom of the chamber of the die cavity right-hand member of post forming lower cavity die, 46 is the profiled ramp be obliquely installed with horizontal direction, post forming upper male mould have for middle product on the right side of the press-fit of upper-end contact top to make middle product right-hand member be deformed into, the top belling be attached on profiled ramp plays 47.Fig. 7 middle term 35 represent realize post forming punch retainer 32, post forming punch upper padding plate 34 is fixed on bolt on post forming mould upper bolster 40; Item 36 represents die shanks; Item 38 and 43 represents trip bolts; Item 39 represents the second alignment pins; Item 42 represents blocks.
This shaped device is the first step in use, uses one-time-shaped mould that blank 48 is squeezed into middle product, and second step uses post forming mould that middle product 20 is squeezed into Z-type fingertip.Concrete operations are: in a first step, blank 48 is positioned in the one-shot forming die cavity of one-shot forming lower cavity die, one-time-shaped mould upper bolster drives the first flanging block and one-shot forming upper male mould to move down, the working portion of the first flanging block first pushes up press-fit with the accent of one-shot forming die cavity along contacting thus realizes the accent of one-shot forming die cavity to seal, can prevent blank from having metal to flow out by one-shot forming die cavity when being extruded like this, can ensure that metal can fully fill up one-shot forming die cavity, one-time-shaped mould upper bolster continues to move down subsequently, because the position of compacted under projection is higher, so first the left blind hole on middle product is formed, along with one-shot forming upper male mould continue move down, left end is metal filled to be completed, ear processed is shaping, right blind hole is shaping, simultaneously, the right-hand member of part product 20 also becomes level, now blank is molded to middle product, middle product is compared with final Z-shaped fingertip, be only the right-hand member of middle product be level, and the right-hand member of Z-shaped fingertip tilts.Then middle product is positioned in post forming lower cavity die by second step, positioning convex locate inserting with the left blind hole of middle product, in the folding process of post forming upper bolster, second flanging block of blank body pushes down the upper end, left side between middle system, therefore the fixing of middle product is achieved by positioning convex and blank body, along with post forming upper bolster continue move down, in the middle of the top belling top lifting pressure of post forming upper male mould, product right-hand member makes middle product right-hand member inclination and distortion, and final formation Z-type fingertip.
In the present invention, the shaping of Z-type fingertip takes distributed operation, all less than larger flexural deformation position in each step, thus avoids metal and can play problem; First flanging block contacts with the epicoele opening's edge of one-shot forming die cavity and is sealed and matched, thus blank can be avoided being extruded metal outflow one-shot forming die cavity in process, ensures that metal can be full by one-shot forming mould filling; When left blind hole is shaping, the flowing of metal also molds ear processed, ensure that the smoothness of metal flow; Forming convax mould, backstay respectively with one-shot forming lower cavity die, the removable assembling of post forming lower cavity die, such easy-unloading.In other embodiment of this Z-type fingertip shaped device used for high-voltage switch: incubation step can not have yet; Lubricant can not certainly be set in one-shot forming die cavity; Forming convax mould and one-shot forming lower cavity die can also be one-body molded; Backstay and post forming lower cavity die also can be one-body molded; Product fixed structure can also be secured by bolts in the pressing plate on post forming lower cavity die, is fixed in post forming lower cavity die by middle product left end by pressing plate.
The embodiment of the post forming mould of Z-type fingertip shaped device used for high-voltage switch is as shown in Fig. 6 ~ 11: the concrete structure of post forming mould is identical with the post forming mould described in above-mentioned each Z-type fingertip shaped device embodiment used for high-voltage switch, is not described in detail in this.
Claims (10)
1. Z-type fingertip shaped device used for high-voltage switch, it is characterized in that: comprise one-time-shaped mould and post forming mould, one-time-shaped mould comprises one-shot forming upper male mould and has the one-shot forming lower cavity die of one-shot forming die cavity, one-shot forming die cavity comprises left forming cavity, right forming cavity and be connected to a left side, between right forming cavity with the sweep shape adaptation of corresponding Z-type fingertip bend to die cavity, left, all be horizontally disposed with at the bottom of the chamber of right forming cavity, post forming mould comprises post forming upper male mould, the post forming lower cavity die placed for corresponding middle product and the product fixed structure for fixing middle product left end, be the profiled ramp be obliquely installed with horizontal direction at the bottom of the chamber of the die cavity right-hand member of post forming lower cavity die, post forming upper male mould have for middle product on the right side of the press-fit of upper-end contact top to make middle product right-hand member be deformed into, the top belling be attached on profiled ramp rises.
2. Z-type fingertip shaped device used for high-voltage switch according to claim 1, it is characterized in that: the compacted under be provided with at the bottom of the chamber of left forming cavity for the left blind hole of shaping Z-type fingertip is protruding, one-shot forming upper male mould has the upper shaping projection of the right blind hole for shaping Z-type fingertip, and one-shot forming die cavity also comprises the ear forming cavity processed of the both sides ear for shaping Z-type fingertip be connected with left forming cavity.
3. Z-type fingertip shaped device used for high-voltage switch according to claim 1, it is characterized in that: on described one-shot forming upper male mould, guiding movement is set with lower end for contacting the first flanging block pushing up press-fit with the epicoele opening's edge of one-shot forming die cavity, one-shot forming upper male mould is fixedly arranged on one-time-shaped mould upper bolster, is provided with the first flanging spring applying active force in downward direction to the first flanging block between one-time-shaped mould upper bolster and the first flanging block.
4. Z-type fingertip shaped device used for high-voltage switch according to claim 3, it is characterized in that: on described first flanging spring and one-time-shaped mould upper bolster, guiding is equipped with the first guide post, the lower end of the first guide post is fixed on described first flanging block, the upper end of the first guide post is provided with outer turning edge, and one-time-shaped mould moves down the limit with the spacing cooperation that turns edge with what limit the relative one-time-shaped mould upper bolster of the first guide post outward.
5. the Z-type fingertip shaped device used for high-voltage switch according to claim 1 ~ 4 any one, it is characterized in that: product fixed structure comprise the die cavity left end being arranged at post forming lower cavity die with the positioning convex of the left blind hole location fit on described middle product, product fixed structure also comprise with described middle product on the left of the blank body of upper end elastic top press-fit.
6. Z-type fingertip shaped device used for high-voltage switch according to claim 5, it is characterized in that: described post forming mould comprises and is installed in post forming die lower bolster on the downside of described post forming lower cavity die by clamping screw, described post forming lower cavity die is equipped with the backstay that axis extends along the vertical direction, described positioning convex is made up of described backstay upper end, post forming die lower bolster coordinates with described backstay lower end block and moves down the limit to limit backstay, described post forming upper male mould is fixedly arranged on post forming mould upper bolster, described blank body comprises the second guide post being fixedly arranged on the guide direction on described post forming mould upper bolster and extending along the vertical direction, on second guide post guiding movement be equipped with lower end for middle product on the left of the second flanging block of upper-end contact top press-fit, the the second flanging spring applying active force in downward direction to the second flanging block is provided with between post forming mould upper bolster and the first flanging block.
7. the post forming mould of Z-type fingertip shaped device used for high-voltage switch, it is characterized in that: comprise post forming upper male mould, for the corresponding middle post forming lower cavity die of product placement and the product fixed structure for fixing middle product left end, be the profiled ramp be obliquely installed with horizontal direction at the bottom of the chamber of the die cavity right-hand member of post forming lower cavity die, post forming upper male mould have for middle product on the right side of the press-fit of upper-end contact top to make middle product right-hand member be deformed into, the top belling be attached on profiled ramp rises.
8. post forming mould according to claim 7, it is characterized in that: product fixed structure comprise the die cavity left end being arranged at post forming lower cavity die with the positioning convex of the left blind hole location fit on described middle product, product fixed structure also comprise with described middle product on the left of the blank body of upper end elastic top press-fit.
9. post forming mould according to claim 8, it is characterized in that: described post forming mould comprises and is installed in post forming die lower bolster on the downside of described post forming lower cavity die by clamping screw, described post forming lower cavity die is equipped with the backstay that axis extends along the vertical direction, described positioning convex is made up of described backstay upper end, and post forming die lower bolster coordinates with described backstay lower end block and moves down the limit to limit backstay.
10. post forming mould according to claim 8 or claim 9, it is characterized in that: described post forming upper male mould is fixedly arranged on post forming mould upper bolster, described blank body comprises the second guide post being fixedly arranged on the guide direction on described post forming mould upper bolster and extending along the vertical direction, on second guide post guiding movement be equipped with lower end for middle product on the left of the second flanging block of upper-end contact top press-fit, be provided with the second flanging spring applying active force in downward direction to the second flanging block between post forming mould upper bolster and the first flanging block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410591032.3A CN104399768A (en) | 2014-10-29 | 2014-10-29 | Z-shaped touch finger forming apparatus for high voltage switch, and its secondary forming die |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410591032.3A CN104399768A (en) | 2014-10-29 | 2014-10-29 | Z-shaped touch finger forming apparatus for high voltage switch, and its secondary forming die |
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| CN104399768A true CN104399768A (en) | 2015-03-11 |
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| CN201410591032.3A Pending CN104399768A (en) | 2014-10-29 | 2014-10-29 | Z-shaped touch finger forming apparatus for high voltage switch, and its secondary forming die |
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Application publication date: 20150311 |