CN102039346A - Opposite teeth extruding type fine-blanking die and fine-blanking method adopting same - Google Patents
Opposite teeth extruding type fine-blanking die and fine-blanking method adopting same Download PDFInfo
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- CN102039346A CN102039346A CN 201010512774 CN201010512774A CN102039346A CN 102039346 A CN102039346 A CN 102039346A CN 201010512774 CN201010512774 CN 201010512774 CN 201010512774 A CN201010512774 A CN 201010512774A CN 102039346 A CN102039346 A CN 102039346A
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Abstract
The invention discloses an opposite teeth extruding type fine-blanking die and a fine-blanking method using the die. Opposite tooth-shaped plates and convex-concave dies are arranged on the upper side of an axial combining surface of the die; teeth cavity dies and anti-jacking plates are arranged on the lower side of the axial combining surface of the die; the opposite tooth-shaped plates and the teeth cavity dies are respectively provided with protruded annular gears, the section of the annular gear is of triangle tooth shape, and the contact lines of the annular gears and a blank are respectively arranged outside a blank upper workpiece outline and surround the outline of the workpiece. When a workpiece is blanked, an upper annular gear and a lower annular gear are respectively pressed into the workpiece to prevent a blank material from flowing in the horizontal direction, and the previous-period extrusion is carried out on the blank material so as to form a strong three dimension compressive stress inside the blank material, reduce the area of a tensile stress generated by the blank material in the blanking process, avoid the cracks, and eliminate sharp edges and burrs of the workpiece. By the invention, fine-blanked workpieces with good quality and high precision can be manufactured by utilizing a universal blanking device so as to promote the development of fine-blanking industry.
Description
Technical field
The present invention relates to a kind of fine blanking die, particularly a kind of subtend tooth squash type fine blanking die and adopt the precision punching method of this mould.
Background technology
Smart dashing is that to utilize the mould of special construction directly to go out cross section quality on plate good, the part that dimensional accuracy is high, be applicable to the production of the tabular part of high accuracy in enormous quantities, in industries such as clock and watch, camera, precision instrument, household electrical appliance, be used widely at present.Common fine blanking technology, adopt the powerful flanging fine blanking die of gear ring, break through in the journey in essence, section is that the gear ring of lance tooth at first is pressed into blank, utilizes the mechanical stop effect of gear ring and the frictional force between blank material and die, stops the blank material along continuous straight runs to flow, make blank material be in three-dimensional compressive stress state, under the situation of crackle does not appear stretching in material, do not realize that the stamping-out of blank material separates, thereby it is good to obtain cross section quality, the blanking part that dimensional accuracy is high.The powerful flanging fine blanking die of present gear ring, only the one side at mould is provided with gear ring pressing plate prevention blank material bottom horizontal flow sheet, only utilize the frictional force of die and blank to stop the blank material bottom horizontal flow sheet at another side, because frictional force is limited, therefore blank material can't produce enough big three-dimensional compression in the punching press deformed area, therefore blanking part cross section quality and the dimensional accuracy of making is limited, especially this technology can't adapt to the stamping-out of thickness sheet material more than 10 millimeters, also be not suitable for the high strength of stamping-out strength degree more than 600 MPas, the inductile material, for example carbon 10 steel can only be no more than 3 millimeters sheet material by stamping-out thickness, therefore make big thickness and high strength at present, the plate part of inductile material, can only be with machining, or low carbon materials stamping-out shaping back recarburization and heat-treating methods processing, and the cost height of machining, cycle is long, recarburization and heat-treating methods after the low carbon materials stamping-out is shaped, complex process not only, the cost height, and the distortion that heat treatment causes is big, can significantly reduce the dimensional accuracy of part, the powerful flanging fine blanking die of therefore present gear ring can't adapt to smart development need towards industry.
Summary of the invention
For the essence that solves powerful flanging fine blanking die incompatibility heavy-gauge sheeting of present gear ring and high strength, inductile sheet material towards processing problems, the present invention proposes a kind of subtend tooth squash type fine blanking die and adopts the precision punching method of this mould, break through in the journey in essence, strengthened the three-dimensional compression of punching press deformed area, the essence that has solved heavy-gauge sheeting and high strength, inductile sheet material is towards processing problems.The technical solution adopted in the present invention is as follows:
Subtend tooth squash type fine blanking die; comprise the subtend tooth plate; at the upside of mould shaft to the composition surface; be provided with subtend tooth plate punch-die and around the punch-die setting; and the subtend tooth plate that is slidingly matched with punch-die; at the downside of mould shaft to the composition surface; correspondence is provided with anti-top board and around anti-top board setting; and the band mark of mouth mould that is slidingly matched with anti-top board; subtend tooth plate and band mark of mouth mould are respectively towards 2 surfaces of blank; and be respectively equipped with the subtend tooth plate gear ring of projection and be with mark of mouth mould gear ring; the contact wire of two gear rings and blank lays respectively at the outside of workpiece profile on the blank; and the profile of encirclement workpiece; and subtend tooth plate gear ring is relative with the crown of band mark of mouth mould gear ring, and punch-die is oppositely arranged with the end face that anti-top board contacts with workpiece.
Contact wire is a workpiece stamping-out incision on the blank; Two gear ring shape and size identical and with respect to the axial engagement of mould in the face of claiming.
Anti-top board center is a through hole, is provided with a punch shape, that be slidingly matched with anti-top board in it, the position of punch and diameter, adapt with the position and the diameter in hole on the workpiece, the punch-die center is a through hole, forms the die of through hole shape, the position of die and size adapt with punch.
Be provided with anti-plunger tip axle in the die, anti-plunger tip axle and die are slidingly connected.
The section of two gear rings is triangular tooth in the various plans of establishment.
The precision punching method of subtend tooth squash type fine blanking die, subtend tooth plate and band mark of mouth mould are expressed to a certain degree in advance to blank, and punch-die moves downward and carries out essence and break through journey.
Refer to that to a certain degree blank material outer shroud is expressed to plasticity depletion in advance, the effect of subtend tooth in addition makes that material almost can not lateral flow when die and punch-die move downward.
The technique effect that the present invention adopts technique scheme to obtain is:
At the upside of mould shaft to the composition surface, be provided with punch-die and around punch-die and the subtend tooth plate that is slidingly connected, at the downside of mould shaft to the composition surface, be provided with anti-top board and around anti-top board and the band mark of mouth mould that is slidingly connected, the surface of subtend tooth plate and band mark of mouth mould, be respectively equipped with the subtend tooth plate gear ring and the band mark of mouth mould gear ring of projection, subtend tooth plate gear ring is relative with the crown of band mark of mouth mould gear ring, can be in the process of punching press, by subtend tooth plate gear ring and band mark of mouth mould gear ring be pressed into the top of blank and below, stop that the blank material in the gear ring is being subjected under the situation that mould pushes up and down, along continuous straight runs flows out the gear ring scope, thereby guarantee at the subtend tooth plate, punch-die and band mark of mouth mould, the relative extruding of anti-top board, under the situation about stopping with subtend tooth plate gear ring and band mark of mouth mould gear ring, the very big three-dimensional compression of the inner generation of blank material in the gear ring, under the effect of powerful three-dimensional compression, the blank material of crush-zone can produce plasticity inevitably and flow, impel the numerical value of three-dimensional compression to reach unanimity, make the blank material of crush-zone be in the hydrostatic pressure state, and has a maximum plastic deformation scope, the most important thing is, break through in the journey in essence, can take subtend tooth plate and band mark of mouth mould that blank is expressed to a certain degree in advance, punch-die moves downward again, guaranteed the powerful three-dimensional compressive stress state of deformed area, even blank is thicker or material plasticity is poor like this, also can essence go out high-quality product.Blank material in the extruding scope is under the hydrostatic pressure state, the blank material stamping-out in the workpiece profile scope is broken away from blank, finish the fine-punching formation of workpiece, blank material can be produced the region limits of tension in the scope of stamping-out incision minimum, thereby avoid cracking because of tension, influence the cross section quality and the dimensional accuracy of workpiece on the section surface of blank.
Be provided with the punch of the axle shape that is slidingly matched in the anti-top board, the position of punch and size adapt with the position and the size in hole on the workpiece, be provided with the die of through hole shape in the punch-die, the position of die and size adapt with the position of punch, can carry out the stamping-out in hole in the scope of workpiece.Punch and die synergy, blank material in the workpiece profile scope is pushed, shears, blank material in the workpiece profile scope still bears under the situation of three-dimensional compression, blank material stamping-out in the profile scope in hole on the workpiece is broken away from workpiece, can reduce the possibility that hole wall cracks, improve the cross section quality and the dimensional accuracy in hole.
Be provided with anti-plunger tip axle in the die, punch and die with workpiece on blank material stamping-out in the profile scope in hole break away from the process of workpiece, the end face of anti-plunger tip axle is the upper surface of the interior blank material of profile scope of extruded hole all the time, blank material in the profile scope in hole bears under the situation of powerful, stable three-dimensional compression, blank material stamping-out in the profile scope in hole on the workpiece is broken away from workpiece, can avoid hole wall to crack, improve the cross section quality and the dimensional accuracy in hole to greatest extent.
Adopt subtend tooth squash type fine blanking die of the present invention and adopt the precision punching method of this mould, can use general pressing equipment, produce cross section quality is good, dimensional accuracy is high essence, promote smart development towards industry towards workpiece.
Description of drawings
Accompanying drawing 1 is that subtend tooth squash type fine blanking die of the present invention is not established anti-plunger tip axle essence and broken through the structural representation of journey before beginning.
Accompanying drawing 2 is that subtend tooth squash type fine blanking die of the present invention is established anti-plunger tip axle essence and broken through the structural representation of journey before beginning.
Accompanying drawing 3 is that subtend tooth squash type fine blanking die essence of the present invention is broken through the structural representation of the 1st stage of journey when finishing.
Accompanying drawing 4 is that subtend tooth squash type fine blanking die essence of the present invention is broken through the structural representation of the 2nd stage of journey when finishing.
Sign implication in the accompanying drawing is as follows:
1-subtend tooth plate, 11-subtend tooth plate gear ring, 2-punch-die, 21-die, 3-hole core waste material, 4-outer shroud waste material, 5-workpiece, the 51-circular arc angle of collapsing, 6-punch, 7-band mark of mouth mould, 71-band mark of mouth mould gear ring, the anti-top board of 8-, the anti-plunger tip axle of 9-, 10-blank.
The specific embodiment
Subtend tooth squash type fine blanking die of the present invention, structure as shown in Figure 1, at the upside of mould shaft to the composition surface, be provided with the subtend tooth plate 1 and the punch-die 2 that are slidingly matched, subtend tooth plate 1 is provided with around punch-die 2, at the downside of mould shaft to the composition surface, be provided with the band mark of mouth mould 7 and the anti-top board 8 that are slidingly matched, band mark of mouth mould 7 is provided with around anti-top board 8, subtend tooth plate 1 and band mark of mouth mould 7 are respectively towards 2 surfaces of blank 10, and be respectively equipped with the subtend tooth plate gear ring 11 of projection and be with mark of mouth mould gear ring 71, form a pair of subtend tooth, the section of 2 gear rings is triangular tooth, the crown of triangular tooth is respectively towards 2 surfaces of blank 10, the contact wire of 2 gear rings and blank 10 lays respectively at the outside of workpiece 5 profiles on the blank 10, and the profile of encirclement workpiece 5, the profile of preferably being close to workpiece 5, the shape and size of subtend tooth plate gear ring 11 and band mark of mouth mould gear ring 71 identical and with respect to the axial engagement of mould in the face of claiming, subtend tooth plate gear ring 11 is relative with the crown of band mark of mouth mould gear ring 71, the shape and size of the end face that punch-die 2 and anti-top board 8 contact with blank 10, adapt with the shape and size of workpiece 5 profiles, punch-die 2 is oppositely arranged with the end face that workpiece 5 contacts with anti-top board 8, subtend tooth plate 1 is slidingly matched with punch-die 2, and band mark of mouth mould 7 is slidingly matched with anti-top board 8.When processing workpiece 5 with holes, establish through hole in the anti-top board 8, the punch 6 that is slidingly matched with anti-top board 8 inner surfaces that adds a shape in the through hole, the position of punch 6, adapt with the position in hole on the workpiece 5, the shape and size of punch 6 sections adapt with the shape and size of the profile in hole on the workpiece 5, add poroid die 21 in the punch-die 2, the position of die 21, adapt with the position of punch 6, the shape and size of die 21 sections adapt with the shape and size of punch 6 sections.The essence of workpiece 5 is broken through journey and is divided into 3 stages:
The 1st stage, blank 10 is put into the working region of mould, the relative position of subtend tooth plate 1 and punch-die 2 is fixed and is moved down, subtend tooth plate gear ring 11 and band mark of mouth mould gear ring 71 are in the outside of the workpiece profile of blank 10, contact and be pressed into the surface of blank 10, all be pressed into blank until gear ring, blank material in the gear ring scope is pressed into the restriction of the subtend tooth plate gear ring 11 and the band mark of mouth mould gear ring 71 of blank, lose the ability that certain along continuous straight runs flows out the gear ring scope, subtend tooth plate 1 continues to be displaced downwardly to subtend tooth plate 1 and the thickness of the spacing of being with mark of mouth mould 7 less than blank 10, punch-die 2 and anti-top board 8 retreat with respect to blank 10 respectively and make between subtend tooth plate 1 and the punch-die 2 simultaneously, and slot milling between band mark of mouth mould 7 and the anti-top board 8, blank material in the gear ring scope is subjected to the extruding of subtend tooth plate 1 and band mark of mouth mould 7, all bear at three-dimensional under the situation of compression and produce plastic deformation, blank material in the part gear ring scope flows in the described slot milling, flow in the process of described slot milling at the part blank material, the part blank material produces bigger frictional force with band mark of mouth mould 7 inner surfaces because of contacting to slide with subtend tooth plate 1 inner surface, under the effect of frictional force, contact the blank material that the part of sliding is positioned at the top layer with subtend tooth plate 1 inner surface with band mark of mouth mould 7 inner surfaces, the speed that enters described slot milling is slack-off, makes the edge of 5 two end faces of workpiece form the circular arc angle 51 of collapsing.The blank outer shroud is expressed to plasticity depletion in advance, the effect of subtend tooth in addition, the blank outer shroud loses the Radial Flow ability fully, makes when punch-die moves downward the blank almost can not lateral flow, has just created condition for reaching powerful three-dimensional compressive stress state in the deformed area.
The 2nd stage, invariant position when subtend tooth plate 1 kept for the 1st stage finished, punch-die 2 downward extrusion blanks 10, promoting anti-top board 8 by blank material simultaneously moves down, punch-die 2, band mark of mouth mould 7 and 8 synergy of anti-top board are pushed, are sheared the blank material in the gear ring scope, and the blank material in the gear ring scope still bears under the situation of three-dimensional compression, blank material stamping-out in the workpiece 5 profile scopes is broken away from blank 10, finish the fine-punching formation of workpiece 5.When processing workpiece 5 with holes, punch 6 and die 21 synergy, blank material in the workpiece 5 profile scopes is pushed, shears, blank material in workpiece 5 profile scopes still bears under the situation of three-dimensional compression, hole core waste material 3 stamping-outs in the profile scope in hole on the workpiece 5 are broken away from workpiece 5, finish the fine-punching formation in hole on the workpiece 5.
The 3rd stage, subtend tooth plate 1 and punch-die 2 rising die sinkings, anti-top board 8 is released workpiece 5, takes out workpiece 5, finishes smart in work.
For cross section quality and the dimensional accuracy that improves hole wall on the workpiece 5, can add anti-plunger tip axle 9 in the die 21, structure as shown in Figure 2, the shape and size of anti-plunger tip axle 9 sections, adapt with the shape and size of punch 6 sections, break through the 2nd stage of journey in essence, punch 6 and die 21 with workpiece 5 on blank material stamping-out in the profile scope in hole break away from the process of workpiece 5, the end face of anti-plunger tip axle 9 is the upper surface of the interior blank material of profile scope of extruded hole all the time, blank material in the profile scope in hole bears under the situation of stable three-dimensional compression, blank material stamping-out in the profile scope in hole on the workpiece 5 is broken away from workpiece, finish the fine-punching formation in hole on the workpiece.
The present invention adopts and to be provided with the punch 6 of a shape and the subtend tooth squash type fine blanking die of anti-plunger tip axle 9, and the structural representation of the punching course during punching press workpiece 5 with holes is shown in accompanying drawing 3 and accompanying drawing 4.
Subtend tooth squash type fine blanking die of the present invention and adopt the precision punching method of this mould is not restricted to the described embodiments, and every principle of the present invention and structure utilized is through conversion and the formed technical scheme of replacement, all in protection scope of the present invention.
Claims (9)
1. subtend tooth squash type fine blanking die; comprise the subtend tooth plate; it is characterized in that: at the upside of mould shaft to the composition surface; be provided with subtend tooth plate punch-die and around concavo-convex mould setting; and the subtend tooth plate that is slidingly matched with concavo-convex mould; at the downside of mould shaft to the composition surface; correspondence is provided with anti-top board and around anti-top board setting; and the band mark of mouth mould that is slidingly matched with anti-top board; subtend tooth plate and band mark of mouth mould are respectively towards 2 surfaces of blank; and be respectively equipped with the subtend tooth plate gear ring of projection and be with mark of mouth mould gear ring; the contact wire of two gear rings and blank lays respectively at the outside of workpiece profile on the blank; and the profile of encirclement workpiece; and subtend tooth plate gear ring is relative with the crown of band mark of mouth mould gear ring, and punch-die is oppositely arranged with the end face that anti-top board contacts with workpiece.
2. subtend tooth squash type fine blanking die according to claim 1 is characterized in that: described contact wire is a workpiece stamping-out incision on the blank; Described two gear ring shape and size identical and with respect to the axial engagement of mould in the face of claiming.
3. subtend tooth squash type fine blanking die according to claim 1 and 2, it is characterized in that: anti-top board center is a through hole, be provided with a punch shape, that be slidingly matched with anti-top board in it, the position of punch and diameter, adapt with the position and the diameter in hole on the workpiece, the punch-die center is a through hole, forms the die of through hole shape, the position of die and size adapt with punch.
4. subtend tooth squash type fine blanking die according to claim 3 is characterized in that: be provided with anti-plunger tip axle in the die, anti-plunger tip axle and die are slidingly connected.
5. subtend tooth squash type fine blanking die according to claim 1 and 2, it is characterized in that: the section of two gear rings is triangular tooth.
6. subtend tooth squash type fine blanking die according to claim 3, it is characterized in that: the section of two gear rings is triangular tooth.
7. subtend tooth squash type fine blanking die according to claim 4, it is characterized in that: the section of two gear rings is triangular tooth.
8. adopt the precision punching method of one of claim 1-7 described subtend tooth squash type fine blanking die, it is characterized in that: subtend tooth plate and band mark of mouth mould are expressed to a certain degree in advance to blank, and punch-die moves downward and carries out essence and break through journey.
9. precision punching method according to claim 8 is characterized in that: the described blank material outer shroud that to a certain degree refers to is expressed to plasticity depletion in advance, and the effect of subtend tooth in addition makes that material almost can not lateral flow when die and punch-die move downward.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010512774.4A CN102039346B (en) | 2010-10-20 | 2010-10-20 | Opposite teeth extruding type fine-blanking die and fine-blanking method adopting same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010512774.4A CN102039346B (en) | 2010-10-20 | 2010-10-20 | Opposite teeth extruding type fine-blanking die and fine-blanking method adopting same |
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| Publication Number | Publication Date |
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| CN102039346A true CN102039346A (en) | 2011-05-04 |
| CN102039346B CN102039346B (en) | 2014-01-01 |
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| CN201010512774.4A Expired - Fee Related CN102039346B (en) | 2010-10-20 | 2010-10-20 | Opposite teeth extruding type fine-blanking die and fine-blanking method adopting same |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102284596A (en) * | 2011-06-22 | 2011-12-21 | 重庆理工大学 | Closed extruding fine blanking die based on floating female die structure |
| CN102489604A (en) * | 2011-11-29 | 2012-06-13 | 苏州千仓精密电子有限公司 | Stamping die |
| CN102672050A (en) * | 2012-05-25 | 2012-09-19 | 武汉理工大学 | Precision stamping mold and rotary precision stamping forming method using same to process helical gears |
| CN102699091A (en) * | 2012-05-21 | 2012-10-03 | 中北大学 | Non-flash die for extruding aluminum alloy shell parts |
| CN103212635A (en) * | 2013-04-17 | 2013-07-24 | 武汉理工大学 | Car transmission synchronizer gear ring fine blanking and deep drawing combined forming process and mold |
| CN103537581A (en) * | 2012-07-17 | 2014-01-29 | 王正平 | Fine hydro-blanking device |
| CN104001793A (en) * | 2014-06-13 | 2014-08-27 | 昆山市润苏物资有限公司 | Stamping die |
| EP2868402A1 (en) * | 2013-11-05 | 2015-05-06 | Cheng-Ping Wang | Fine blanking device |
| CN105855354A (en) * | 2016-05-16 | 2016-08-17 | 常州大学 | Chain wheel blanking forming method and device |
| CN109834966A (en) * | 2019-04-08 | 2019-06-04 | 江苏国力锻压机床有限公司 | The hydraulic fine machine of servo-pump control and its hydraulic processing method |
| CN111408651A (en) * | 2019-12-31 | 2020-07-14 | 江苏金鹏汽车座椅有限公司 | Single-process multi-construction-method machining device |
| CN113305211A (en) * | 2021-05-13 | 2021-08-27 | 佛山市钜泽益精密科技有限公司 | Air conditioner sliding vane machining method |
| CN116689586A (en) * | 2022-11-30 | 2023-09-05 | 珠海菲高科技股份有限公司 | Soft metal coarse and fine punching integrated punching lower die |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102284596A (en) * | 2011-06-22 | 2011-12-21 | 重庆理工大学 | Closed extruding fine blanking die based on floating female die structure |
| CN102284596B (en) * | 2011-06-22 | 2014-02-26 | 重庆理工大学 | Closed extruding fine blanking die based on floating female die structure |
| CN102489604A (en) * | 2011-11-29 | 2012-06-13 | 苏州千仓精密电子有限公司 | Stamping die |
| CN102699091B (en) * | 2012-05-21 | 2014-10-01 | 中北大学 | Non-flash die for extruding aluminum alloy shell parts |
| CN102699091A (en) * | 2012-05-21 | 2012-10-03 | 中北大学 | Non-flash die for extruding aluminum alloy shell parts |
| CN102672050A (en) * | 2012-05-25 | 2012-09-19 | 武汉理工大学 | Precision stamping mold and rotary precision stamping forming method using same to process helical gears |
| CN103537581A (en) * | 2012-07-17 | 2014-01-29 | 王正平 | Fine hydro-blanking device |
| CN103212635A (en) * | 2013-04-17 | 2013-07-24 | 武汉理工大学 | Car transmission synchronizer gear ring fine blanking and deep drawing combined forming process and mold |
| CN103212635B (en) * | 2013-04-17 | 2015-05-27 | 武汉理工大学 | Car transmission synchronizer gear ring fine blanking and deep drawing combined forming process and mold |
| EP2868402A1 (en) * | 2013-11-05 | 2015-05-06 | Cheng-Ping Wang | Fine blanking device |
| CN104607528A (en) * | 2013-11-05 | 2015-05-13 | 王正平 | Groove type precision blanking device |
| TWI583456B (en) * | 2013-11-05 | 2017-05-21 | 王正平 | Trough-form fine blanking device |
| CN104001793A (en) * | 2014-06-13 | 2014-08-27 | 昆山市润苏物资有限公司 | Stamping die |
| CN105855354A (en) * | 2016-05-16 | 2016-08-17 | 常州大学 | Chain wheel blanking forming method and device |
| CN109834966A (en) * | 2019-04-08 | 2019-06-04 | 江苏国力锻压机床有限公司 | The hydraulic fine machine of servo-pump control and its hydraulic processing method |
| CN109834966B (en) * | 2019-04-08 | 2023-12-22 | 江苏扬力液压装备有限公司 | Servo pump control hydraulic fine blanking machine and hydraulic machining method thereof |
| CN111408651A (en) * | 2019-12-31 | 2020-07-14 | 江苏金鹏汽车座椅有限公司 | Single-process multi-construction-method machining device |
| CN113305211A (en) * | 2021-05-13 | 2021-08-27 | 佛山市钜泽益精密科技有限公司 | Air conditioner sliding vane machining method |
| CN116689586A (en) * | 2022-11-30 | 2023-09-05 | 珠海菲高科技股份有限公司 | Soft metal coarse and fine punching integrated punching lower die |
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| CN102039346B (en) | 2014-01-01 |
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