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CN104668369B - A kind of diel - Google Patents

A kind of diel Download PDF

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Publication number
CN104668369B
CN104668369B CN201510090610.XA CN201510090610A CN104668369B CN 104668369 B CN104668369 B CN 104668369B CN 201510090610 A CN201510090610 A CN 201510090610A CN 104668369 B CN104668369 B CN 104668369B
Authority
CN
China
Prior art keywords
mould
movable component
product
lower mould
hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201510090610.XA
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Chinese (zh)
Other versions
CN104668369A (en
Inventor
王小贞
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201510090610.XA priority Critical patent/CN104668369B/en
Publication of CN104668369A publication Critical patent/CN104668369A/en
Application granted granted Critical
Publication of CN104668369B publication Critical patent/CN104668369B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02Stamping using rigid devices or tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/10Die sets; Pillar guides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/10Die sets; Pillar guides
    • B21D37/12Particular guiding equipment, e.g. pliers; Special arrangements for interconnection or cooperation of dies

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Punching Or Piercing (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Abstract

The invention discloses a kind of diel; wherein described diel includes upper die and lower die; the upper mould includes upper mold framework and upper mould product template; some upper punch are set to press off hole in the upper mould product template; the lower mould includes low mold frame frame and lower mould product template; some bottom punches are set to press off hole in the lower mould product template; at least one movable component is provided with the upper mould or lower mould; depression bar is installed, the location matches of the depression bar press off hole in upper punch or bottom punch presses off hole on the movable component.The novel punching method and mould have stamping quality good, efficiency high, the low advantage of labor intensity.

Description

A kind of diel
Technical field
Applied the present invention relates to plate stamping shaping, be particularly suitable for FPC punch formings field, it is especially a kind of new Diel.
Background technology
In today that electronics technology is flourishing, various electronic equipments are full of arround we live, in the electronic device, FPC (flexible PCB) is a kind of most common parts, and FPC usually needs to be bent into an assembling process suitable shape with side Just assemble, improve the production efficiency of electronic equipment.Therefore, needing to carry out FPC using pressing equipment in assembling electronic equipment Punch forming.However, because FPC generally needs to bend by multiple tracks, if carrying out punching press to it using existing pressing equipment Shaping is needed by Multi-step forming, and FPC is easily pullled damage, and stamping quality is poor, inefficiency.
In view of this, it is an object of the invention to provide a kind of new technical scheme to solve existing technical problem.
The content of the invention
In order to overcome the deficiencies in the prior art, the present invention provides a kind of diel, solves prior art presence Stamping quality it is poor, easily damage FPC, the technological deficiency such as ram efficiency is low.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of novel punching method, applied to this kind of method of punch forming mainly by one have it is single, two or many The mould of individual movable component carries out a upper and lower mould matched moulds to stamping parts, completes the machine-shaping of single track, twice or multiple tracks broken line.
A kind of diel, the punch forming applied to product, it is characterised in that:The mould includes upper mould with At least provided with a movable component in mould, described two modules of upper die and lower die, depression bar is installed on the movable component, institute Stating depression bar is used to carry out punch forming to product.
As the improvement of above-mentioned technical proposal, the movable component includes upper mould movable component and lower mould movable component, institute Stating depression bar includes upper molding bar and lower molding bar, and the upper mould includes upper mold framework and upper mould product template, the upper mould product Set some upper punch to press off in template and some upper mould movable components are provided with hole, the upper mold framework, the upper mould activity Molding bar is provided with component, the location matches of the upper molding bar press off hole in the upper punch in upper mould product template, institute Stating lower mould includes setting some bottom punches to press off hole in low mold frame frame and lower mould product template, the lower mould product template, described It is provided with low mold frame frame on some lower mould movable components, the lower mould movable component and is provided with lower molding bar, the lower molding The location matches of bar press off hole in the bottom punch in lower mould product template.
As the further improvement of above-mentioned technical proposal, the upper die and lower die also include being respectively used to drive mould activity The upper mould power set and lower mould power set of component and lower mould movable component matched moulds, the upper mould power set and lower mould power After the upper mould movable component of device driving is acted with lower mould movable component, the upper bar that is molded is through the upper punch pressure in upper mould product template Perforate, lower molding bar presses off hole, the end of upper molding bar and the end of lower molding bar through the bottom punch in lower mould product template Mutual cooperation makes product punch forming.
As the further improvement of above-mentioned technical proposal, the upper mould movable component and lower mould movable component are both provided with multiple Position device.
As the further improvement of above-mentioned technical proposal, the resetting means is reseting elastic element.
As the further improvement of above-mentioned technical proposal, use is offered in the upper mould product template and lower mould product template In the mould inside groove for placing stamping products, the mould inside groove has in depression bar stamping products with the effect for keeping away position.
As the further improvement of above-mentioned technical proposal, this kind of mould also includes the positioning that upper die and lower die are positioned Device, the positioner includes being arranged on the matched moulds locating dowel of mould and is arranged on the matched moulds positioning hole of lower mould, upper die and lower die During positioning, the matched moulds locating dowel is inserted in the matched moulds positioning hole and upper die and lower die is mutually located.
As the further improvement of above-mentioned technical proposal, the upper mould movable component and lower mould movable component are provided with broken line Module, contour set, positioning and guiding set, depression bar.
As the further improvement of above-mentioned technical proposal, stopping means is provided with the upper mould or lower mould, it is described spacing Device is limited block or limited post.
The beneficial effects of the invention are as follows:The invention provides a kind of novel punching method and mould, this kind of method and mould FPC bending can be completed in a punching press, and the bending of sequencing can be realized to FPC by movable component, it is to avoid Existing diel simultaneously punching press FPC bending places easily occur the problem of pullling damage, FPC position of broken line is more accurate, punching Press quality good, the workload of conventional mould punching press several times is completed after one one-tenth punching press, operating efficiency is high, saves labour.This kind The stamping quality that novel punching method and mould solve prior art presence is poor, easily damages FPC, the ram efficiency skill such as lowly Art defect.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the structural representation of the present invention;
Fig. 2 is the structural representation of another angle of the invention;
Fig. 3 is the assembling principle schematic of the present invention;
Fig. 4 is the structural representation before product punch forming in the embodiment of the present invention;
Fig. 5 is the structural representation after product punch forming in the embodiment of the present invention.
Embodiment
The technique effect of the design of the present invention, concrete structure and generation is carried out below with reference to embodiment and accompanying drawing clear Chu, it is fully described by, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this hair Bright a part of embodiment, rather than whole embodiments, based on embodiments of the invention, those skilled in the art is not paying The other embodiment obtained on the premise of creative work, belongs to the scope of protection of the invention.In addition, being related in patent All connection/annexations, not singly refer to component and directly connect, and refer to can according to specific implementation situation, by addition or Reduce couple auxiliary, the movable component that particularly present invention is mentioned, to constitute more excellent draw bail.It is each in the invention Individual technical characteristic, can be with combination of interactions, reference picture 1-5 on the premise of not conflicting conflict.
A kind of novel punching method, applied to punch forming, this kind of method mainly by one have it is single, two or many The mould of individual movable component carries out a upper and lower mould matched moulds to stamping parts, completes the machine-shaping of single track, twice or multiple tracks broken line.
A kind of diel, applied to the punch forming of product, the mould includes upper mould 1 and lower mould 2, it is described on At least provided with a movable component in 2 two modules of mould 1 and lower mould, depression bar, the depression bar are installed on the movable component For carrying out punch forming to product.
In the specific implementation, can be that upper mould 1 is provided with movable component, lower mould 2 is not provided with movable component;On either Mould 1 is not provided with movable component, and lower mould 2 is provided with movable component;Or be that upper mould 1 and lower mould 2 are both provided with activity group Part, in a word, at least one module is provided with movable component in upper mould 1 and lower mould 2.
Preferably, the movable component includes upper mould movable component 13 and lower mould movable component 23, and the depression bar includes upper Bar and lower molding bar are molded, the upper mould includes setting in upper mold framework 11 and upper mould product template, the upper mould product template Some upper punch, which are pressed off, is provided with some upper mould movable components 13, the upper mould movable component 13 in hole, the upper mold framework 11 On be provided with molding bar, the location matches of the upper molding bar press off hole in the upper punch in upper mould product template, it is described under Mould includes low mold frame frame 21 and lower mould product template, sets in the lower mould product template some bottom punches to press off hole, it is described under Be provided with mold framework 21 on some lower mould active modules 23, the lower mould active module 23 and be provided with lower molding bar, it is described under The location matches of molding bar press off hole in the bottom punch in lower mould product template.
Above-mentioned upper mold framework 11 and low mold frame frame 21 refers to the basic installation component of mould 1 and lower mould 2, implements actual During patent, its concrete shape is not limited to the shape of specification and its accompanying drawing, above-mentioned upper mould product template and lower mould product Template refers to that for each component template stamping forming to product it can place the product that is stamped when implementing.It will need to be rushed Molded product is placed in product template, and after after upper and lower mould matched moulds, the depression bar on movable component just can be to the product that is stamped Carry out shaping work.Depression bar refers to distance rod or thrust block pad.Preferably, in the present embodiment, pressure is mounted with movable component Bar.In the specific implementation, depression bar can also be cancelled, shaping work is carried out to the product that is stamped by lengthening upper and lower mould power set Make.
Preferably, the upper mould 1 and lower mould 2 also include being respectively used to drive mould movable component 13 and lower mould movable component The upper mould power set and lower mould power set of 23 matched moulds, the upper mould power set and the upper mould activity of lower mould power set driving After component 13 is acted with lower mould movable component 23, upper molding bar presses off hole, lower molding through the upper punch in upper mould product template Bar presses off hole through the bottom punch in lower mould product template, and the end of upper molding bar and the end mutual cooperation of lower molding bar make production Product punch forming.
In the present embodiment, the quantity of the upper mould movable component 13 and lower mould movable component 23 is all two, in reality During carrying out an invention, implementer can use the suitably upper mould movable component 13 of quantity with according to FPC bending quantity Mould movable component 23, implements flexible.
The upper mould power set and lower mould power set are cylinder or oil cylinder or electric cylinders, it is preferable that in the present embodiment, The upper mould power set and lower mould power set are cylinder.
Preferably, the upper mould movable component 13 and lower mould movable component 23 are both provided with resetting means, the reset dress Reseting elastic element is set to, after upper mould movable component 13 and the lower matched moulds stamping products of mould movable component 23, product punch forming, Upper mould power set and the revocation of lower mould power set are to movable component activity, and in the present embodiment, the reseting elastic element is Back-moving spring.
The mould inside groove for placing stamping products is offered in the upper mould product template and lower mould product template, it is described Mould inside groove has in depression bar stamping products with the effect for keeping away position.
The positioner that this kind of mould also includes mould 1, lower mould 2 is positioned, the positioner includes being arranged on The matched moulds locating dowel of upper mould 1 and the matched moulds positioning hole for being arranged on lower mould 2, when the 2-in-1 mould of upper mould 1, lower mould is positioned, the matched moulds positioning Post inserts in the matched moulds positioning hole and upper mould 1, lower mould 2 is mutually located, in practical application, the positioner can be with It is varied as desired in, for example, can be positioned using guide pillar, guide pin bushing, in addition, matched moulds locating dowel and matched moulds positioning hole can be upper The position of lower mould location swap, matched moulds locating dowel and matched moulds positioning hole can also adjust and adjust according to actual performance.
The upper mould movable component 13 and lower mould movable component 23 include broken line module, contour set, positioning and guiding set, pressure Bar.
Stopping means is provided with the upper mould 1 or lower mould 2, the stopping means is limited block or limited post.
The present invention is mainly made up of upper mould 1 and lower two parts of mould 2.In the present embodiment, the cooperation of upper mould 1, lower mould 2 is passed through Disposably to complete the bending of multiple products.As illustrated, product being placed in pallet neatly.The groove of pallet is to product shape Into accurate positioning.It should be strongly noted that plate 0008 also can directly process groove, or locating dowel is installed to position production Product, now can be without using the left and right limited block on pallet and lower mould 2.In this example pallet is used to pick and place the convenience of product.It is recessed Perforate is processed at groove, the presence of perforate is to carry out broken line to FPC for convenience of broken line module, is upper mould 1 or the broken line module of lower mould 2 Perforate.Pallet is positioned on lower mould 2 to complete order broken line, completes positioning in this example using positioning PIN.Pallet or so two While being mounted with limited block.The distance of matched moulds, can also protect pallet not by upper mould 1, lower mould 2 above and below can the controlling of this limited block Active force, so as to be subject to crushing.Limited block may be mounted at the part of mould 1, the lower part of mould 2 can be also arranged on, in the present embodiment In, limited block is positioned on the lower part of mould 2.Products material needs the diatom that bending goes out as we can see from the figure, and to the broken line of product There is sequencing, otherwise product is also easy to produce tear or weighed wounded.
In the present embodiment, there is the similar component of structure in upper mould 1, lower mould 2, and emphasis detailed annotation is carried out in the following part of mould 2.Plate 0008 Broken line module is installed with plate 0009, guide pin bushing, support bar, locating rod, spring, contour screw, limited block etc., form a group Part.Plate 0010 and plate 0011 are provided with broken line module, contour set, positioning sleeve, distance rod etc., form a component.The He of plate 0012 Plate 0013 is provided with broken line module, contour set, positioning sleeve, thrust block pad etc., forms a component.Plate 0014 is connected by support bar Plate 0008 and the component of the formation of plate 0009, form an activity space.Each component moves up and down, so as to complete in order Bending.It is to facilitate lifting or putting down for mould that upper and lower mould, which is provided with handle, to shift, and is installed, storage.
In the present embodiment, upper mould 1 and lower mould 2 are compressed by the cooperation of guide pillar guide pin bushing, and cope plate 0006 and plate 0007 are formed Component in broken line module or the briquetting specially installed can be downward to product formation pressure force, such product orientation is more Accurately, it is difficult to tilt and positioning.Plate 0002 and the component of the formation of plate 0003 are moved downward in the presence of the upper thrust block pad of mould 1.When This component encounters stop motion after limited post.At this moment the broken line module in component have also been made moving downward for certain position, and peace The broken line to FPC is completed mounted in the broken line module of the lower correspondence position of mould 2.Folded first at product A.The thrust block pad of mould 1 on now Failed power, under the action of the spring, and the component of plate 0002 and the formation of plate 0003 is moved and resetted upwards.And then plate 0004 Component with the formation of plate 0005 is moved downward in the presence of upper mould distance rod.Stop motion after this component encounters plate 0006. At this moment the broken line module in component have also been made moving downward for certain position, and installed in the broken line module of the lower correspondence position of mould 2 Complete broken line.Folded at product B.Now the upper distance rod of mould 1 fails power, under the action of the spring, plate 0004 and plate 0005 component formed is moved and resetted upwards.And then work of the component that plate 0012 and plate 0013 are formed in the lower thrust block pad of mould 2 Under, motion upwards.Stop motion after this component encounters limited post.At this moment the broken line module in component have also been made certain position Upward motion, and complete broken line installed in the broken line module of the upper correspondence position of mould 1.Folded at products C.This at present mould 2 push away Power block is failed power, under the action of the spring, and the component of plate 0012 and the formation of plate 0013 is moved downward and resetted.And then plate 0010 and plate 0011 formation component in the presence of lower mould distance rod, upwards motion.Stop after this component encounters the plate of plate 0009 Only move.At this moment the broken line module in component have also been made the upward motion of certain position, installed in the broken line of the upper correspondence position of mould 1 Module completes broken line.Folded at product D.Now all broken lines are fully completed, and the lower distance rod of mould 2 fails power, in spring In the presence of, the component of plate 0010 and the formation of plate 0011 is moved downward and resetted.At this moment whole above mould 1 and lower two parts of mould 2 Separate, the whole series motion is completed.Product after broken line can take out with pallet.The core of above technology is each component by transporting up and down Move to complete multiple product multiple tracks broken lines.
Preferably, the plate 0014 of bottom has also inlayed magnetic in the plate 0001 and lower mould 2 at top in upper mould 1 in the present embodiment Element, can be confirmed whether that upper mould 1 or the position of lower mould 2 install correct to be installed on during board by magnetic strength element.
Above is the preferable implementation to the present invention is illustrated, but the invention is not limited to the implementation Example, such as one, in some product punch formings, there is the similar conventional ones forming die structure of upper mould 1, not comprising plate 0001, plate 0002, plate 0003, the component of plate 0004 and plate 0005, only plate 0006 and plate 0007 formation, part of the lower die and this example The structure of middle introduction is similar.2nd, in some product punch formings, there is the similar conventional ones shaping mould in part of the lower die and sign an undertaking Structure, not comprising plate 0010, plate 0011, plate 0012, plate 0013 and plate 0014, only plate 0008 and the component of the formation of plate 0009, on Mould part is similar with the structure introduced in this example.3rd, in upper mould 1, the component of plate 0006 and the formation of plate 0007 does not install broken line Punching pin, and lower mould 2 completes broken line with the broken line punching pin of upper other movable components of mould 1.4th, in lower mould 2, plate 0008 and plate 0009 component formed does not install broken line punching pin, and completes folding with mould 1 is closed by the broken line punching pin of lower other movable components of mould 2 Line.5th, parts are installed by method of stop screw or close-fitting etc., plate 0006 and plate 0007 in upper mould 1 is merged into one Plate, mould other structures are constant.6th, parts are installed by method of stop screw or close-fitting etc., by the He of plate 0008 in lower mould 2 Plate 0009 is merged into a plate, and mould other structures are constant.7th, to prevent from adhering to mould 1 during product broken line, pacify on plate 0007 Shock mount PIN carries out binder or the thin steel sheet binder on pallet cover.
Those skilled in the art can also make a variety of equivalent variations on the premise of without prejudice to spirit of the invention Or replace, these equivalent deformations or replacement are all contained in the application claim limited range.

Claims (8)

1. a kind of diel, the punch forming applied to product, it is characterised in that:The mould includes upper mould with At least provided with a movable component in mould, described two modules of upper die and lower die, depression bar is installed on the movable component, institute Stating depression bar is used to carry out product punch forming, and the movable component includes upper mould movable component and lower mould movable component, described Depression bar includes upper molding bar and lower molding bar, and the upper mould includes upper mold framework and upper mould product template, the upper mould product mould Set some upper punch to press off on plate and some upper mould movable components are provided with hole, the upper mold framework, the upper mould activity group Molding bar is provided with part, the location matches of the upper molding bar press off hole in the upper punch in upper mould product template, described Lower mould includes low mold frame frame and lower mould product template, sets in the lower mould product template some bottom punches to press off hole, it is described under It is provided with mold framework on some lower mould movable components, the lower mould movable component and is provided with lower molding bar, the lower molding bar Location matches press off hole in the bottom punch in lower mould product template.
2. a kind of diel according to claim 1, it is characterised in that:The upper die and lower die also include difference Upper mould power set and lower mould power set for driving upper mould movable component and lower mould movable component matched moulds, the upper mould are moved After power apparatus and the upper mould movable component of lower mould power set driving are acted with lower mould movable component, upper molding bar passes through upper mould product Upper punch in template presses off hole, and lower molding bar presses off hole, the end of upper molding bar through the bottom punch in lower mould product template Being cooperated with the end of lower molding bar makes product punch forming.
3. a kind of diel according to claim 1 or 2, it is characterised in that:The upper mould movable component is with Mould movable component is both provided with resetting means.
4. a kind of diel according to claim 3, it is characterised in that:The resetting means is Flexible Reset member Part.
5. a kind of diel according to claim 1, it is characterised in that:The upper mould product template and the production of lower mould The mould inside groove for placing stamping products is offered in product template, the mould inside groove has and had in depression bar stamping products Keep away the effect of position.
6. a kind of diel according to claim 1, it is characterised in that:This kind of mould also include mould, under The positioner that mould is positioned, the positioner includes being arranged on the matched moulds locating dowel of mould and is arranged on the matched moulds of lower mould Positioning hole, when upper die and lower die are positioned, the matched moulds locating dowel is inserted in the matched moulds positioning hole and make it that upper die and lower die are mutual Positioning.
7. a kind of diel according to claim 1, it is characterised in that:The upper mould movable component and lower mould are lived Dynamic component is provided with broken line module, contour set, positioning and guiding set, depression bar.
8. a kind of diel according to claim 1, it is characterised in that:Set limited on the upper mould or lower mould Position device, the stopping means is limited block or limited post.
CN201510090610.XA 2015-02-28 2015-02-28 A kind of diel Expired - Fee Related CN104668369B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510090610.XA CN104668369B (en) 2015-02-28 2015-02-28 A kind of diel

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CN104668369A CN104668369A (en) 2015-06-03
CN104668369B true CN104668369B (en) 2017-07-28

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105945141A (en) * 2016-06-22 2016-09-21 深圳市峥嵘机械自动化有限公司 Punching and line folding method and die
CN105935723A (en) * 2016-06-22 2016-09-14 深圳市峥嵘机械自动化有限公司 Punching delay unloading method and mold

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5161403A (en) * 1991-06-25 1992-11-10 Digital Equipment Corporation Method and apparatus for forming coplanar contact projections on flexible circuits
CN202428677U (en) * 2011-12-31 2012-09-12 宁波东钱湖旅游度假区润群机械有限公司 Electromagnetic punching machine
CN102962301A (en) * 2012-11-06 2013-03-13 珠海锐翔电子有限公司 Automatic bending machine for flexible circuit board
CN203030757U (en) * 2013-01-31 2013-07-03 宁波市四通达模具制造有限公司 Stamping die structure
CN204620825U (en) * 2015-02-28 2015-09-09 王小贞 A kind of diel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5161403A (en) * 1991-06-25 1992-11-10 Digital Equipment Corporation Method and apparatus for forming coplanar contact projections on flexible circuits
CN202428677U (en) * 2011-12-31 2012-09-12 宁波东钱湖旅游度假区润群机械有限公司 Electromagnetic punching machine
CN102962301A (en) * 2012-11-06 2013-03-13 珠海锐翔电子有限公司 Automatic bending machine for flexible circuit board
CN203030757U (en) * 2013-01-31 2013-07-03 宁波市四通达模具制造有限公司 Stamping die structure
CN204620825U (en) * 2015-02-28 2015-09-09 王小贞 A kind of diel

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Granted publication date: 20170728

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