CN105798099A - Forming technology for skylight reinforcing plate - Google Patents
Forming technology for skylight reinforcing plate Download PDFInfo
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- CN105798099A CN105798099A CN201610387357.9A CN201610387357A CN105798099A CN 105798099 A CN105798099 A CN 105798099A CN 201610387357 A CN201610387357 A CN 201610387357A CN 105798099 A CN105798099 A CN 105798099A
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- blank holder
- skylight
- blank
- plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a forming technology for a skylight reinforcing plate. The forming technology comprises the following steps that a skylight reinforcing blank plate is placed on a blank holder and located by material stops; the blank holder is close to an upper die, the skylight reinforcing blank plate is fixed, and the skylight reinforcing blank plate is further fastened and fixed through material blocking ribs of the upper die and material blocking grooves of the blank holder at this moment; the upper die and the blank holder move downwards together, and a male die is embedded into a hollowed area of the blank holder to be firstly in contact with the skylight reinforcing blank plate and then press the outer edge face of the skylight reinforcing blank plate together with the blank holder in a contact manner; the upper die continues to move downwards, the skylight reinforcing blank plate generates plastic deformation under the action of the male die, and a stretching procedure is completed; and the upper die moves upwards, the blank holder is ejected out to move upwards through air cushion ejector bars, the blank holder is ejected to the initial position through the air cushion ejector bars, and at this moment, the skylight reinforcing blank plate is separated from the upper die, and the upper die continues to move upwards to the initial position. In the stretching process, part feeding is even, cracking is not prone to happening, the stability is improved, the rejection rate is decreased, and the probability of die galling and normal abrasion is reduced.
Description
Technical field
The present invention relates to a kind of drawing forming process for plates of automobile plate, belong to drawing technology field.
Background technology
Drawing is to utilize drawing die under the pressure effect of forcing press, will be cut into the plate blank of definite shape in advance, the processing method being drawn into stereo hollow part.Drawing die is of a great variety, and such as, little has metal cup or the big vehicle body molding having automobile.Drawing die is generally mainly made up of die, holding pad and punch three part.During drawing, by upper and lower eccentric swage, tablet is compressed when forcing press is depressed with specified pressure, then by punch-die, slab is stretched to state on earth, press is risen lower eccentric swage jack-up part and takes out.
Summary of the invention
It is an object of the present invention to provide a kind of forming technology strengthening plate for skylight, this forming technology part in drawing process being used for skylight reinforcement plate walks material uniformly, it is not easily susceptible to cracking, improve stability, reduce scrappage, decrease the probability of mould plucking and normal wear, reduce number of times and the cost of maintenance.
For reaching above-mentioned purpose, the technical solution used in the present invention is: a kind of forming technology strengthening plate for skylight, described forming technology is based on a drawing and shaping mold, this drawing and shaping mold includes mould, blank holder, punch and counterdie, described upper mould farther includes be located therein the upper die face in region, centre and be positioned at the left side at its two ends, right projection, this is left, right projection lateral surface is provided with the first upper slide, described upper mould lower surface and be positioned at die face surrounding and be provided with the first elastomer, this first upper slide is provided with several through holes all with interval, this through hole is embedded with graphite column, the lower surface of described upper mould and be positioned at die face both sides and be symmetrically provided with resistance material muscle along its length；
The middle section of described blank holder has a vacancy section and it is respectively arranged at two ends with the left outside protuberance with gap slot, right male part, the upper surface of blank holder and be positioned at vacancy section surrounding and be provided with several stock stops and first balance weight corresponding with the first elastomer, and the upper surface of blank holder and be positioned at both sides, vacancy section and be symmetrically provided with the resistance material groove corresponding with resistance material muscle along its length, the lower surface of blank holder and be positioned at vacancy section surrounding there is several air cushion tops rod and the second elastomers, described left outside protuberance, the gap slot medial wall of right male part and lateral wall are respectively arranged with the first lower skateboard and the second upper slide that coordinate with the first upper slide, this first lower skateboard is evenly spaced apart to be provided with several through holes, this through hole is embedded with graphite column；
Described counterdie farther includes die shoe, several second balance weights corresponding with the second elastomer, 4 lifting portions, several are available for taper pore and 4 the location squares that air cushion top rod embeds, described four lifting portions lay respectively at four corners of die shoe side surface, several second balance weights described and several taper pores are all distributed in die shoe upper surface and are positioned at punch surrounding, described 4 location squares lay respectively at four corners of die shoe upper surface, square inside 2 side surfaces in described location are provided with the second lower skateboard coordinated with the second upper slide, this second lower skateboard is evenly spaced apart to be provided with several through holes, this through hole is embedded with graphite column；
Described punch is fixed on the die shoe upper surface of counterdie, the vacancy section of described blank holder for for punch embed, the left and right projection of described upper mould can the left outside protuberance of wedge pressure flange, right male part gap slot in；
The described forming technology for skylight reinforcement plate further includes steps of
Step one, skylight is strengthened blank plate it is placed on blank holder, and positioned by stock stop；
Step 2, blank holder and upper mould are close, fix by skylight is strengthened blank plate, and the resistance material groove that skylight is now strengthened the blank plate resistance material muscle by upper mould and blank holder reinforces fixed skylight reinforcement blank plate further；
Step 3, upper mould are descending in the lump with blank holder, first strengthen blank plate with skylight and contact in the vacancy section of punch wedge pressure flange, and the outer edge surface that then skylight is jointly strengthened blank plate with blank holder contacts compression；
Step 4, upper mould continue descending, and skylight is strengthened blank plate and produced plastic deformation under the effect of punch, completes stretching process；
Step 5, upper mould are up, and blank holder is ejected up by air cushion top rod, blank holder by blank holder top to original position, now, skylight strengthen blank plate and upper mode division from, upper mould continues to go upward to original position.
The technical scheme improved further in technique scheme is as follows:
As preferably, in described counterdie, several taper pores are positioned at outside several second balance weights.
As preferably, described graphite column surface accounts for the 40 ~ 50% of the first upper slide, the first lower skateboard, the second lower skateboard or the second upper slide surface.
Owing to technique scheme is used, the present invention compared with prior art has following advantages and effect:
1. the present invention strengthens the forming technology of plate for skylight, which reduces the normal wear speed of mould, extends the mold use life-span；During production, in drawing process, part walks material uniformly, it is not easily susceptible to cracking, improve stability, reduce scrappage, decrease the probability of mould plucking and normal wear, reduce number of times and the cost of maintenance, during production, in drawing process, part walks material uniformly, cannot be easily caused cracking, improve stability, reduce part rejection rate.
2, the present invention strengthens the forming technology of plate for skylight, the lower surface of mould and be positioned at die face both sides and be symmetrically provided with resistance material muscle along its length on it, the upper surface of blank holder and be positioned at both sides, vacancy section and be symmetrically provided with the resistance material groove corresponding with resistance material muscle along its length, material is accommodated, desirably prevent material to move in forming process, improving the concordance making product, the quality making product is more stable.
Accompanying drawing explanation
Accompanying drawing 1 is drawing and shaping mold structure schematic diagram of the present invention；
Accompanying drawing 2 is drawing and shaping mold decomposition texture schematic diagram one of the present invention；
Accompanying drawing 3 is drawing and shaping mold partial structurtes schematic diagram one of the present invention；
Accompanying drawing 4 is drawing and shaping mold partial structurtes schematic diagram two of the present invention；
Accompanying drawing 5 is drawing and shaping mold partial structurtes schematic diagram three of the present invention.
In the figures above: 1, upper mould；101, upper die face；2, blank holder；201, vacancy section；3, punch；301, lower die face；4, counterdie；51, left projection；52, right projection；6, the first upper slide；7, the first elastomer；8, resistance material muscle；91, left outside protuberance；92, right male part；10, stock stop；11, the first balance weight；12, resistance material groove；13, air cushion top rod；14, the second elastomer；15, gap slot；16, the first lower skateboard；17, through hole；18, graphite column；20, die shoe；21, the second balance weight；22, lifting portion；23, taper pore；24, location square；25, the second lower skateboard；26, the second upper slide.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
Embodiment 1: a kind of forming technology strengthening plate for skylight, described forming technology is based on a drawing and shaping mold, and this drawing and shaping mold includes mould 1, blank holder 2, punch 3 and counterdie 4,
Described upper mould 1 farther includes be located therein the upper die face 101 in region, centre and be positioned at the left and right projection 51,52 at its two ends, this left and right projection 51,52 lateral surface is provided with the first upper slide 6, described upper mould 1 lower surface and be positioned at die face 101 surrounding and be provided with the first elastomer 7, this first upper slide 6 is provided with several through holes 17 all with interval, this through hole 17 is embedded with graphite column 18, the lower surface of described upper mould 1 and be positioned at die face 101 both sides and be symmetrically provided with resistance material muscle 8 along its length；
nullThe middle section of described blank holder 2 has a vacancy section 201 and it is respectively arranged at two ends with the left outside protuberance with gap slot 15、Right male part 91、92，The upper surface of blank holder 2 and be positioned at vacancy section 201 surrounding and be provided with several stock stops 10 and first balance weight 11 corresponding with the first elastomer 7，And the upper surface of blank holder 2 and be positioned at both sides, vacancy section 201 and be symmetrically provided with the resistance material groove 12 corresponding with resistance material muscle 8 along its length，The lower surface of blank holder 2 and be positioned at vacancy section surrounding there is several air cushion tops rod 13 and the second elastomers 14，Described left outside protuberance、Right male part 91、Gap slot 15 medial wall of 92 and lateral wall are respectively arranged with the first lower skateboard 16 and the second upper slide 26 coordinated with the first upper slide 6，This first lower skateboard 16 is evenly spaced apart be provided with several through holes 17，This through hole 17 is embedded with graphite column 18；
Described counterdie 4 farther includes die shoe 20, several second balance weights 21 corresponding with the second elastomer 14, 4 lifting portions 22, several are available for taper pore 23 and 4 the location squares 24 that air cushion top rod 13 embeds, described four lifting portions 22 lay respectively at four corners of die shoe 20 side surface, several second balance weights 21 described and several taper pores 23 are all distributed in die shoe 20 upper surface and are positioned at punch 3 surrounding, described 4 location squares 24 lay respectively at four corners of die shoe 20 upper surface, square 24 inside 2 side surfaces in described location are provided with the second lower skateboard 25 coordinated with the second upper slide 26, this second lower skateboard 25 is evenly spaced apart be provided with several through holes 17, this through hole 17 is embedded with graphite column 18；
Described punch 3 is fixed on die shoe 20 upper surface of counterdie 4, the vacancy section of described blank holder 2 201 for embedding for punch 3, the left and right projection 51,52 of described upper mould can the left outside protuberance of wedge pressure flange 2, right male part 91,92 gap slot 15 in；
The described forming technology for skylight reinforcement plate further includes steps of
Step one, skylight is strengthened blank plate it is placed on blank holder 2, and positioned by stock stop 10；
Step 2, blank holder 2 are close with upper mould 1, fix by skylight is strengthened blank plate, and the resistance material groove 12 that skylight is now strengthened the blank plate resistance material muscle 8 by upper mould 1 and blank holder 2 reinforces fixed skylight reinforcement blank plate further；
Step 3, upper mould 1 are descending in the lump with blank holder 2, first strengthen blank plate with skylight and contact in the vacancy section 201 of punch 3 wedge pressure flange 2, then contact compression with the common outer edge surface that skylight is strengthened blank plate of blank holder 2；
Step 4, upper mould continue descending, and skylight is strengthened blank plate and produced plastic deformation under the effect of punch 3, completes stretching process；
Step 5, upper mould 1 are up, and blank holder 2 is ejected up by air cushion top rod 13, and skylight is strengthened blank plate and ejected and separate with punch 3 by blank holder 2, blank holder 2 is pushed up original position by air cushion top rod 13, now, skylight is strengthened blank plate and is separated with upper mould 1, and upper mould 1 continues to go upward to original position.
Above-mentioned graphite column 18 surface accounts for the 42% of first upper slide the 6, first lower skateboard the 16, second lower skateboard 25 or the second upper slide 26 surface.
Embodiment 2: a kind of forming technology strengthening plate for skylight, described forming technology is based on a drawing and shaping mold, and this drawing and shaping mold includes mould 1, blank holder 2, punch 3 and counterdie 4,
Described upper mould 1 farther includes be located therein the upper die face 101 in region, centre and be positioned at the left and right projection 51,52 at its two ends, this left and right projection 51,52 lateral surface is provided with the first upper slide 6, described upper mould 1 lower surface and be positioned at die face 101 surrounding and be provided with the first elastomer 7, this first upper slide 6 is provided with several through holes 17 all with interval, this through hole 17 is embedded with graphite column 18, the lower surface of described upper mould 1 and be positioned at die face 101 both sides and be symmetrically provided with resistance material muscle 8 along its length；
nullThe middle section of described blank holder 2 has a vacancy section 201 and it is respectively arranged at two ends with the left outside protuberance with gap slot 15、Right male part 91、92，The upper surface of blank holder 2 and be positioned at vacancy section 201 surrounding and be provided with several stock stops 10 and first balance weight 11 corresponding with the first elastomer 7，And the upper surface of blank holder 2 and be positioned at both sides, vacancy section 201 and be symmetrically provided with the resistance material groove 12 corresponding with resistance material muscle 8 along its length，The lower surface of blank holder 2 and be positioned at vacancy section surrounding there is several air cushion tops rod 13 and the second elastomers 14，Described left outside protuberance、Right male part 91、Gap slot 15 medial wall of 92 and lateral wall are respectively arranged with the first lower skateboard 16 and the second upper slide 26 coordinated with the first upper slide 6，This first lower skateboard 16 is evenly spaced apart be provided with several through holes 17，This through hole 17 is embedded with graphite column 18；
Described counterdie 4 farther includes die shoe 20, several second balance weights 21 corresponding with the second elastomer 14, 4 lifting portions 22, several are available for taper pore 23 and 4 the location squares 24 that air cushion top rod 13 embeds, described four lifting portions 22 lay respectively at four corners of die shoe 20 side surface, several second balance weights 21 described and several taper pores 23 are all distributed in die shoe 20 upper surface and are positioned at punch 3 surrounding, described 4 location squares 24 lay respectively at four corners of die shoe 20 upper surface, square 24 inside 2 side surfaces in described location are provided with the second lower skateboard 25 coordinated with the second upper slide 26, this second lower skateboard 25 is evenly spaced apart be provided with several through holes 17, this through hole 17 is embedded with graphite column 18；
Described punch 3 is fixed on die shoe 20 upper surface of counterdie 4, the vacancy section of described blank holder 2 201 for embedding for punch 3, the left and right projection 51,52 of described upper mould can the left outside protuberance of wedge pressure flange 2, right male part 91,92 gap slot 15 in；
The described forming technology for skylight reinforcement plate further includes steps of
Step one, skylight is strengthened blank plate it is placed on blank holder 2, and positioned by stock stop 10；
Step 2, blank holder 2 are close with upper mould 1, fix by skylight is strengthened blank plate, and the resistance material groove 12 that skylight is now strengthened the blank plate resistance material muscle 8 by upper mould 1 and blank holder 2 reinforces fixed skylight reinforcement blank plate further；
Step 3, upper mould 1 are descending in the lump with blank holder 2, first strengthen blank plate with skylight and contact in the vacancy section 201 of punch 3 wedge pressure flange 2, then contact compression with the common outer edge surface that skylight is strengthened blank plate of blank holder 2；
Step 4, upper mould continue descending, and skylight is strengthened blank plate and produced plastic deformation under the effect of punch 3, completes stretching process；
Step 5, upper mould 1 are up, and blank holder 2 is ejected up by air cushion top rod 13, and skylight is strengthened blank plate and ejected and separate with punch 3 by blank holder 2, blank holder 2 is pushed up original position by air cushion top rod 13, now, skylight is strengthened blank plate and is separated with upper mould 1, and upper mould 1 continues to go upward to original position.
In above-mentioned counterdie 4, several taper pores 23 are positioned at outside several second balance weights 21.
Above-mentioned graphite column 18 surface accounts for the 48% of first upper slide the 6, first lower skateboard the 16, second lower skateboard 25 or the second upper slide 26 surface.
When adopting the above-mentioned forming technology strengthening plate for skylight, which reduce the normal wear speed of mould, extend the mold use life-span；During production, in drawing process, part walks material uniformly, it is not easily susceptible to cracking, improve stability, reduce scrappage, decrease the probability of mould plucking and normal wear, reduce number of times and the cost of maintenance, during production, in drawing process, part walks material uniformly, cannot be easily caused cracking, improve stability, reduce part rejection rate；Secondly, the lower surface of mould and be positioned at die face both sides and be symmetrically provided with resistance material muscle along its length on it, the upper surface of blank holder and be positioned at both sides, vacancy section and be symmetrically provided with the resistance material groove corresponding with resistance material muscle along its length, material is accommodated, desirably prevent material to move in forming process, improving the concordance making product, the quality making product is more stable.
Above-described embodiment only for technology design and the feature of the present invention are described, its object is to allow person skilled in the art will appreciate that present disclosure and to implement according to this, can not limit the scope of the invention with this.All equivalences made according to spirit of the invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (3)
- null1. the forming technology strengthening plate for skylight，It is characterized in that: described forming technology is based on a drawing and shaping mold，This drawing and shaping mold includes mould (1)、Blank holder (2)、Punch (3) and counterdie (4)，Described upper mould (1) farther includes be located therein the upper die face (101) in region, centre and be positioned at the left side at its two ends、Right projection (51、52)，This is left、Right projection (51、52) lateral surface is provided with the first upper slide (6)，Described upper mould (1) lower surface and be positioned at die face (101) surrounding and be provided with the first elastomer (7)，This first upper slide (6) is provided with several through holes (17) all with interval，This through hole (17) is embedded with graphite column (18)，The lower surface of described upper mould (1) and be positioned at die face (101) both sides and be symmetrically provided with resistance material muscle (8) along its length；nullThe middle section of described blank holder (2) has a vacancy section (201) and it is respectively arranged at two ends with the left outside protuberance with gap slot (15)、Right male part (91、92)，The upper surface of blank holder (2) and be positioned at vacancy section (201) surrounding and be provided with several stock stops (10) and first balance weight (11) corresponding with the first elastomer (7)，And the upper surface of blank holder (2) and be positioned at vacancy section (201) both sides and be symmetrically provided with the resistance material groove (12) corresponding with resistance material muscle (8) along its length，The lower surface of blank holder (2) and be positioned at vacancy section surrounding there is several air cushion tops rod (13) and the second elastomers (14)，Described left outside protuberance、Right male part (91、92) gap slot (15) medial wall and lateral wall are respectively arranged with the first lower skateboard (16) and the second upper slide (26) that coordinate with the first upper slide (6)，This first lower skateboard (16) is evenly spaced apart to be provided with several through holes (17)，This through hole (17) is embedded with graphite column (18)；nullDescribed counterdie (4) farther includes die shoe (20)、Several second balance weights (21) corresponding with the second elastomer (14)、4 lifting portions (22)、Several are available for taper pore (23) and 4 location square (24) that air cushion top rod (13) embeds，Described four lifting portions (22) lay respectively at four corners of die shoe (20) side surface，Several second balance weights (21) described and several taper pores (23) are all distributed in die shoe (20) upper surface and are positioned at punch (3) surrounding，Described 4 location square (24) lay respectively at four corners of die shoe (20) upper surface，Inside 2 side surfaces in described location square (24) are provided with the second lower skateboard (25) coordinated with the second upper slide (26)，This second lower skateboard (25) is evenly spaced apart to be provided with several through holes (17)，This through hole (17) is embedded with graphite column (18)；The described punch (3) with lower die face (301) is fixed on die shoe (20) upper surface of counterdie (4), the vacancy section (201) of described blank holder (2) for for punch (3) embed, the left and right projection (51,52) of described upper mould can the left outside protuberance of wedge pressure flange (2), right male part (91,92) gap slot (15) in；The described forming technology for skylight reinforcement plate further includes steps ofStep one, skylight is strengthened blank plate it is placed on blank holder (2), and positioned by stock stop (10)；Step 2, blank holder (2) are close with upper mould (1), fixing by skylight is strengthened blank plate, the resistance material groove (12) that skylight is now strengthened the blank plate resistance material muscle (8) by upper mould (1) and blank holder (2) reinforces fixed skylight reinforcement blank plate further；Step 3, upper mould (1) are descending in the lump with blank holder (2), first strengthen blank plate with skylight and contact in the vacancy section (201) of punch (3) wedge pressure flange (2), then contact compression with the common outer edge surface that skylight is strengthened blank plate of blank holder (2)；Step 4, upper mould (1) continue descending, and skylight is strengthened blank plate and produced plastic deformation under the effect of punch (3), completes stretching process；Step 5, upper mould (1) are up, blank holder (2) is ejected up by air cushion top rod (13), (skylight is strengthened that blank plate ejects and (3 separate with punch to blank holder by 2, air cushion top rod (13) is by blank holder (2) top to original position, now, skylight is strengthened blank plate and is separated with upper mould (1), and upper mould (1) continues to go upward to original position.
- 2. the forming technology strengthening plate for skylight according to claim 1, it is characterised in that: in described counterdie (4), several taper pores (23) are positioned at several the second balance weight (21) outsides.
- 3. the forming technology strengthening plate for skylight according to claim 1, it is characterised in that: described graphite column (18) surface accounts for the 40 ~ 50% of the first upper slide (6), the first lower skateboard (16), the second lower skateboard (25) or the second upper slide (26) surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610387357.9A CN105798099A (en) | 2016-06-03 | 2016-06-03 | Forming technology for skylight reinforcing plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610387357.9A CN105798099A (en) | 2016-06-03 | 2016-06-03 | Forming technology for skylight reinforcing plate |
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| CN106425289A (en) * | 2016-08-22 | 2017-02-22 | 靖江市新程汽车零部件有限公司 | Processing technology for disintegrated-type car sunroof reinforcement board |
| CN107309337A (en) * | 2017-07-25 | 2017-11-03 | 重庆华达汽车配件制造有限公司 | A kind of Drawing Die |
| CN110280663A (en) * | 2019-07-08 | 2019-09-27 | 湘潭大学 | A kind of top cover inner plate stamping die |
| CN111842661A (en) * | 2020-07-27 | 2020-10-30 | 格致汽车科技股份有限公司 | Stamping die capable of measuring inflow amount and using method and application thereof |
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| CN105328069A (en) * | 2015-12-11 | 2016-02-17 | 重庆大发天地机械制造工业有限公司 | Lower insert of stamping die for doorsill inner plate connecting part and supporting structure of lower insert |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106425289A (en) * | 2016-08-22 | 2017-02-22 | 靖江市新程汽车零部件有限公司 | Processing technology for disintegrated-type car sunroof reinforcement board |
| CN107309337A (en) * | 2017-07-25 | 2017-11-03 | 重庆华达汽车配件制造有限公司 | A kind of Drawing Die |
| CN110280663A (en) * | 2019-07-08 | 2019-09-27 | 湘潭大学 | A kind of top cover inner plate stamping die |
| CN111842661A (en) * | 2020-07-27 | 2020-10-30 | 格致汽车科技股份有限公司 | Stamping die capable of measuring inflow amount and using method and application thereof |
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