CN106424325A - Production technology and dedicated device of enhanced pull ring - Google Patents
Production technology and dedicated device of enhanced pull ring Download PDFInfo
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- CN106424325A CN106424325A CN201510475344.2A CN201510475344A CN106424325A CN 106424325 A CN106424325 A CN 106424325A CN 201510475344 A CN201510475344 A CN 201510475344A CN 106424325 A CN106424325 A CN 106424325A
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Abstract
The invention discloses a production technology of an enhanced pull ring. A pull ring material strip is accurately fed through a step wheel. The production technology comprises the steps of punching, outer contour blanking, rivet hole shaping, edge pre-rolling, riveting plane forming, 90-degree edge rolling, final edge rolling, and final reinforced shaping; and the steps are carried out through a punching station, a large edge cutting station, an edge pre-rolling station, a 90-degree edge rolling station and a final edge rolling and shaping reinforcement station which are sequentially arranged. The invention further discloses the specific structure of the final edge rolling and shaping reinforcement station adopted as a dedicated device, a plurality of pull ring production lines are arranged between an upper die holder and a lower die holder, and the pull ring production lines comprise stepping conveyer belts, final edge rolling upper dies, final edge rolling lower dies, shaping reinforcement upper dies, final shaping lower dies, final flattening lower dies, and the like. The production technology has the advantages that the control is convenient, the operation is stable and the production efficiency is high, the enhanced pull ring with better quality is provided, and industrial mass production of the enhanced pull ring is achieved.
Description
Technical field
The present invention relates to a kind of production equipment of draw ring, the production technology of especially a kind of reinforced draw ring and special equipment.
Background technology
The draw ring of common environment-friendly type easy-open lid on the market, its opening end is circular arc type reinforcement structure, it is designed as punching press circular arc R 5.0, circular arc length 9.5, impact extrusion pressure depth is 0.85mm, however, the draw ring of this kind of design size in forming process is more unstable, a certain proportion of draw ring bending or Splitting occur when easy-open lid is opened, even results in the use problem that easy-open lid cannot be opened.Quality due to loop product depends on the performance of its process equipment and the control of production technology, in prior art, Application No. 88207714.7
Utility model provide a kind of stepped die set for draw-ring，By upper、The operation module of the lower template and guide upright post linear array 11 stations is combined，Version is compound die，There is guide-localization、Binder、Punching、Impressing、Otch、Crimping，The mechanisms such as shaping cut-out，Specifically，It is upper、Punching work step mould is set between lower template、Shaping step mould、Cut work step mould、Bending work step mould、Pre-roll work step mould、Essence volume work step mould、Press-bending work step mould and cut-out work step mould，Wherein cut work step mould and include die and jacking block，Punching、Bending、Pre-roll and essence volume work step mould are constituted by punch and die，This utility model is reasonable in design，Machining accuracy is high，Rigidity is good，Long service life，But the draw ring quality that it is produced is unstable，Bending when draw ring cannot be avoided to use or tear phenomenon，Reduce the serviceability of product.
Content of the invention
For the deficiencies in the prior art, the present invention provides a kind of production technology of reinforced draw ring and special equipment, have the advantages that easy to control, stable, production efficiency is high, both provided a kind of more preferably reinforced draw ring of quality, and also achieved the industrial volume production of this reinforced draw ring.
The technical scheme is that：A kind of production technology of reinforced draw ring, draw ring material strip passes through step pitch wheel feeding it is characterised in that comprising the steps：
A punching, rushes draw ring finger hole, U-shaped opening, rivet hole, is carried out by punching station；
B outline is punched, and is punched whole draw ring outline, is carried out by big trimming station leading portion；
C rivet hole shaping, carries out shaping to rivet hole, removes flash removed, is carried out by big trimming station back segment；
D pre-curl：In order to prevent, draw ring from scraping handss, increase tab strength needs draw ring is carried out with the micro- volume of early stage of crimping, is carried out by pre-curl station leading portion；
E riveted planar shaping：By punching press, go out plane in the shaping of rivet installation position, carried out by pre-curl station back segment；
90 degree of crimpings of f：The material that draw ring is needed rim roll position is crimped onto 90 degree of positions, is carried out by 90 degree of crimping stations；
G end crimping：The material ditch needing rim roll position is stacked to design standard position, station leading portion is strengthened by whole crimping and shaping and carries out；
H finally strengthens shaping：Get fan area and two reinforcements, improve draw ring structure, station back segment is strengthened by whole crimping and shaping and carries out.
Preferably, described step h also include making draw ring pull-up portion more smooth finally flatten action.
A kind of special equipment of reinforced draw ring provided by the present invention it is characterised in that：Station is strengthened in described step g, the whole crimping of step h application and shaping, including the upper bolster being connected by lead and die shoe, whole crimping upper backup pad, whole crimping upper padding plate and whole crimping upper mounting plate are installed below described upper bolster successively, described die shoe is sequentially arranged above with whole crimping lower supporting plate, whole crimping lower bolster and whole crimping lower installation board；
Mould and rivet hole positioning needle that is embedded and stretching out mould on whole crimping on whole crimping are installed in the lower section of described whole crimping upper mounting plate feed zone, it is provided with mould under whole crimping below the feed zone of whole crimping lower installation board, it is provided with the lower mold core being connected with elastic mechanism in mould under whole crimping, lower mold core realizes the positioning of draw ring material strip rivet hole with the cooperation of rivet hole positioning needle, and mould and mould cooperation on whole crimping under whole crimping completes the whole crimping action in draw ring portion in draw ring material strip；
It is provided with shaping below described whole crimping upper mounting plate discharging section and strengthens upper mould and embedded and stretch out the upper mold core that upper mould is strengthened in shaping, the discharging phase method of whole crimping lower installation board is sequentially installed with final shaping mould and finally flattens lower mould.
Preferably, it is provided with some draw ring production lines between described upper bolster and die shoe, every draw ring production line all includes mould on the whole crimping that is correspondingly arranged, upper mould is strengthened in mould under whole crimping, shaping, mould and finally flatten lower mould under final shaping；The final crimping of draw ring is completed by the extruding of whole crimping upper and lower mould, punch press moves and drives step pitch wheel feeding, the draw ring completing final crimping enters final shaping and finally flattens operation, Presser Dashing repoussage shape is strengthened upper mould and mutually extrudes with mould under final shaping getting fan area and reinforcement, and shaping simultaneously is strengthened upper mould and completed to flatten action to draw ring lift end with finally flattening lower mould and mutually extruding.
Preferably, the feed end at described whole crimping and shaping reinforcement station is provided with discharging device, discharging device includes material returned block upperpush rod, stripper and elastic mechanism under whole crimping, described material returned block upperpush rod has two and is fixed on whole crimping upper padding plate both sides, under whole crimping, be embedded in can be up and down in whole crimping lower installation board for stripper, and below stripper under whole crimping, both sides are respectively provided with an elastic mechanism.
Preferably, the discharge end at described whole crimping and shaping reinforcement station is provided with material-supporting device, material-supporting device includes retainer block upperpush rod, whole crimping retainer block and elastic mechanism, described retainer block upperpush rod has two and is fixed on whole crimping upper padding plate both sides, two whole crimping retainer block activities are embedded in whole crimping lower installation board both sides, are mounted on an elastic mechanism below each whole crimping retainer block.
Preferably, described elastic mechanism includes spring housing and the movable spring embedding in spring housing, spring pressure head, and described spring is set in die shoe, and spring pressure head is arranged on spring top.
Preferably, described whole crimping lower installation board two side roof part is symmetrically arranged with for spacing left cover and right cover plate.
The operation principle of the present invention is：1st, draw ring material strip passes through the accurate feeding of operating of step pitch wheel and punch press；2nd, in the processing post-tensioning ring basic forming through former operations, whole crimping and shaping mould are entered；3rd, whole rim roll upper and lower mould passes through the molding that extruding completes outline, is carrying out impact extrusion pressure by shaping mould；4th, final shaping mould passes through the sector structure at upper mold core top, forms extruding, final molding reinforcement with lower mould thimble.
Beneficial effects of the present invention are：The present invention is by the Design of Dies to special equipment, a kind of production technology of reinforced draw ring is provided, the reinforced draw ring being provided, can be prevented effectively from bending or the Splitting that draw ring occurs in opening process, and complete equipment achieves Automated condtrol, easy to adjust, stable, safe and reliable, good processing accuracy, production efficiency is high, has better adapted to large-scale industrial production requirement.
Brief description
Fig. 1 is the sectional view of the present invention；
Fig. 2 is the sectional view that station is strengthened in present invention end crimping and shaping；
Fig. 3 is the sectional view one that station is strengthened in present invention end crimping and shaping；
Fig. 4 is the sectional view two that station is strengthened in present invention end crimping and shaping；
Fig. 5 is the top view of the reinforced draw ring of the present invention；
In figure, 1- end crimping upper padding plate, 2- end crimping upper mounting plate, upper mould, 4- upper mold core are strengthened in 3- shaping, and 5- finally flattens lower mould, mould under 6- final shaping, 7- rivet hole positioning needle, mould on 8- end crimping, mould under 9- end crimping, 10- lower mold core；
11- spring pressure head, 12- spring housing, 13- spring, 14- material returned block upperpush rod, 15- left cover, stripper under 16- end crimping, 17- end crimping lower bolster, 18- end crimping lower supporting plate, 19- right cover plate, 20- end crimping lower installation board, 21- end crimping retainer block；
Station is strengthened in 81- punching station, the big trimming station of 82-, 83- pre-curl station, 84-90 degree crimping station, 85- end crimping and shaping；
91- finger hole, 92- rivet hole, 93- fan section, 94- reinforcement, 95-U type opening.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described further：
As shown in Figure 1, the production technology of reinforced draw ring provided by the present invention, its draw ring material strip carries out accurate feeding by step pitch wheel, strengthen shaping step including punching, outline punching, rivet hole shaping, pre-curl, riveted planar shaping, 90 degree of crimpings, whole crimpings with finally, each step is strengthened station 85 by the punching station 81 setting gradually, big trimming station 82,83,90 degree of pre-curl station crimping station 84 and whole crimping and shaping and is carried out respectively, and the specific implementation process of above-mentioned draw ring production technology is then：
A, punching, rush draw ring finger hole 91, U-shaped opening 95 and rivet hole 92, are carried out by some grades of perforating dies at punching station 81, also can punching other location hole, eyebrow hole, U-shaped hole；
B, outline punching, are punched whole draw ring outline, are carried out by the leading portion of big trimming station 82；
C, rivet hole shaping, carry out shaping to rivet hole 92, remove flash removed, are beneficial to final draw ring riveted, are carried out by the back segment of big trimming station 82；
D, pre-curl：For preventing draw ring from scraping handss, increasing tab strength needs draw ring is carried out with the micro- volume of early stage of crimping, is carried out by the leading portion at pre-curl station 83；
E, riveted planar shaping：By punching press, shaping goes out rivet and installs bit plane, is carried out by the back segment at pre-curl station 83；
F, 90 degree of crimpings：The material needing rim roll position is crimped onto 90 degree of positions, is carried out by 90 degree of crimping stations 84；
G, whole crimping：The material ditch needing rim roll position is stacked to design standard position, station 85 leading portions is strengthened by whole crimping and shaping and carries out；
H, finally reinforcement shaping：Get fan area and two reinforcements 94, and complete finally to flatten action to draw ring pull-up portion, to improve draw ring structure, station 85 back segments are strengthened by whole crimping and shaping and carries out.
When being embodied as, whole draw ring mould is fixed in punch press, and on draw ring mould, in upper die of punching press template, under draw ring, mold lock is in punching machine lower mold plate for mold lock.Punch press moves, and by belt transmission to change speed gear box, the index dial being arranged on change speed gear box starts dividing movement, drives draw ring material strip to travel forward, and the feeding of whole draw ring mould be by draw ring mould outside step pitch wheel rotate and complete.After draw ring material strip enters mould, through punching（Finger hole drift, rivet hole drift, U-shaped hole stamping knife, eyebrow hole drift become shearing to complete puncture motion with bottom punch capitiform downwards by punch press motion）, outline punching, rivet hole shaping, pre-curl, riveted planar shaping, 90 degree of crimpings, whole crimpings and finally strengthen shaping step, complete draw ring processing technique.
In above-mentioned draw ring production technology, step g, station 85 is strengthened in the whole crimping of step h application and shaping, belong to the special equipment producing reinforced draw ring, as Fig. 2, shown in Fig. 3 and Fig. 4, the composition of this equipment includes upper bolster and the die shoe connecting by lead, whole crimping upper backup pad is installed below described upper bolster successively, whole crimping upper padding plate 1 and whole crimping upper mounting plate 2, described die shoe is sequentially arranged above with whole crimping lower supporting plate 18, whole crimping lower bolster 17 and whole crimping lower installation board 20, whole 20 liang of side roof parts of crimping lower installation board are symmetrically arranged with left cover 15 and right cover plate 19, it is spacing and material strip is taken away during rising after preventing upper punch pressure that cover plate is used for both sides；
Mould 8 and rivet hole positioning needle 7 that is embedded and stretching out mould 8 on whole crimping on whole crimping are installed in the lower section of described whole crimping upper mounting plate 2 feed zone, it is provided with mould 9 under whole crimping below the feed zone of whole crimping lower installation board 20, it is provided with the lower mold core 10 being connected with elastic mechanism in mould 9 under whole crimping, lower mold core 10 realizes the positioning of draw ring material strip rivet hole 92 with rivet hole positioning needle 7 cooperation, under whole crimping, mould 9 and mould 8 cooperation on whole crimping complete the whole crimping action in draw ring portion in draw ring material strip, elastic mechanism includes the spring 13 in spring housing 12 and the embedded spring housing 12 of activity, spring pressure head 11, described spring housing 12 is arranged in die shoe, spring pressure head 11 is arranged on spring 13 top and is connected with lower mold core 10；
It is provided with shaping below described whole crimping upper mounting plate 2 discharging section and strengthen upper mould 3 and upper mold core 4 that is embedded and stretching out the upper mould 3 of shaping reinforcement, the discharging phase method of whole crimping lower installation board 20 is sequentially installed with final shaping mould 6 and finally flattens lower mould 5, under final shaping, fan area and the reinforcement 94 that draw ring is got in upper mould 3 cooperation is strengthened in the forming surface of mould 6 and shaping, finally flattens the forming surface of lower mould 5 and upper mould 3 bottom of shaping reinforcement mutually extrudes and completes to flatten action so that draw ring pull-up portion is more smooth.
Wherein, it is provided with four draw ring production lines between described upper bolster and die shoe, every draw ring production line all includes mould 8 on the whole crimping that is correspondingly arranged, upper mould 3 is strengthened in mould 9 under whole crimping, shaping, mould 6 and finally flatten lower mould 5 under final shaping.
Wherein, as shown in Figure 3, the feed end at described whole crimping and shaping reinforcement station 85 is provided with discharging device, discharging device includes material returned block upperpush rod 14, stripper 16 and elastic mechanism under whole crimping, described material returned block upperpush rod 14 has two and is fixed on whole crimping upper padding plate 1 both sides, under whole crimping, be embedded in can be up and down in whole crimping lower installation board 20 for stripper 16, under whole crimping, stripper 16 lower section both sides are respectively provided with an elastic mechanism, elastic mechanism includes the spring 13 in spring housing 12 and the embedded spring housing 12 of activity, spring pressure head 11, described spring housing 12 is arranged in die shoe, spring pressure head 11 is arranged on spring 13 top and is connected with stripper 16 under whole crimping.
Wherein, as shown in Figure 4, the discharge end at described whole crimping and shaping reinforcement station 85 is provided with material-supporting device, material-supporting device includes retainer block upperpush rod, whole crimping retainer block 21 and elastic mechanism, described retainer block upperpush rod has two and is fixed on whole crimping upper padding plate 1 both sides, two whole crimping retainer block 21 activities are embedded in whole crimping lower installation board 20 both sides, it is mounted on an elastic mechanism below each whole crimping retainer block 21, elastic mechanism includes the spring 13 in spring housing 12 and the embedded spring housing 12 of activity, spring pressure head 11, described spring housing 12 is arranged in die shoe, spring pressure head 11 is arranged on spring 13 top and is connected with whole crimping retainer block 21, the picking-up anti-stopping materials strip of material strip that act as of material-supporting device is taken on lower mould, snap in step pitch roller type feeding.
A kind of reinforced draw ring being obtained by the production technology making of the present invention, its structure is as shown in Figure 5, described tab rear part is provided with finger hole 91, tab front part is provided with rivet hole 92 and the U-shaped opening centered on rivet hole 92 95, described draw ring opening end is stamped with recessed fan section 93, the both sides in fan section 93 constitute two reinforcements 94 respectively with the draw ring at U-shaped opening 95 two ends, two reinforcements 94 be preferably orthoscopic and between angle be 80 °；The reinforced draw ring of this kind of structure, by increasing the size-modify of two reinforcements 94 and punching press circular arc, make the structural stability of draw ring opening end good, significantly reduce and bend when draw ring uses or tear the probability of situation, it is to avoid the problem that when people use, easy-open lid cannot be opened.
Merely illustrating the principles of the invention described in above-described embodiment and description and most preferred embodiment; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements both fall within scope of the claimed invention.
Claims (8)
1. a kind of production technology of reinforced draw ring, draw ring material strip passes through step pitch wheel feeding it is characterised in that comprising the steps：
A punching, rushes draw ring finger hole, U-shaped opening, rivet hole, is carried out by punching station；
B outline is punched, and is punched whole draw ring outline, is carried out by big trimming station leading portion；
C rivet hole shaping, carries out shaping to rivet hole, removes flash removed, is carried out by big trimming station back segment；
D pre-curl：In order to prevent, draw ring from scraping handss, increase tab strength needs draw ring is carried out with the micro- volume of early stage of crimping, is carried out by pre-curl station leading portion；
E riveted planar shaping：By punching press, go out plane in the shaping of rivet installation position, carried out by pre-curl station back segment；
90 degree of crimpings of f：The material that draw ring is needed rim roll position is crimped onto 90 degree of positions, is carried out by 90 degree of crimping stations；
G end crimping：The material ditch needing rim roll position is stacked to design standard position, station leading portion is strengthened by whole crimping and shaping and carries out；
H finally strengthens shaping：Get fan area and two reinforcements, improve draw ring structure, station back segment is strengthened by whole crimping and shaping and carries out.
2. reinforced draw ring according to claim 1 production technology it is characterised in that：Described step h also include making draw ring pull-up portion more smooth finally flatten action.
3. a kind of special equipment of reinforced draw ring it is characterised in that：Station is strengthened in described step g, the whole crimping of step h application and shaping, including the upper bolster being connected by lead and die shoe, whole crimping upper backup pad, whole crimping upper padding plate and whole crimping upper mounting plate are installed below described upper bolster successively, described die shoe is sequentially arranged above with whole crimping lower supporting plate, whole crimping lower bolster and whole crimping lower installation board；Mould and rivet hole positioning needle that is embedded and stretching out mould on whole crimping on whole crimping are installed in the lower section of described whole crimping upper mounting plate feed zone, it is provided with mould under whole crimping below the feed zone of whole crimping lower installation board, it is provided with the lower mold core being connected with elastic mechanism in mould under whole crimping, lower mold core realizes the positioning of draw ring material strip rivet hole with the cooperation of rivet hole positioning needle, and mould and mould cooperation on whole crimping under whole crimping completes the whole crimping action in draw ring portion in draw ring material strip；
It is provided with shaping below described whole crimping upper mounting plate discharging section and strengthen upper mould and upper mold core that is embedded and stretching out the upper mould of shaping reinforcement, the discharging phase method of whole crimping lower installation board is sequentially installed with final shaping mould and finally flattens lower mould, under final shaping, fan area and the reinforcement that draw ring is got in upper mould cooperation is strengthened in mould thimble and shaping, finally flatten the forming surface of lower mould and shaping strengthen upper mould bottom mutually extrude complete draw ring pull-up portion flatten action.
4. reinforced draw ring according to claim 3 special equipment it is characterised in that：It is provided with some draw ring production lines, mould under mould on step-by-step movement conveyer belt that every draw ring production line all includes being correspondingly arranged, whole crimping, whole crimping, shaping strengthen upper mould, mould and finally flatten lower mould under final shaping between described upper bolster and die shoe.
5. reinforced draw ring according to claim 3 special equipment it is characterised in that：The feed end at described whole crimping and shaping reinforcement station is provided with discharging device, discharging device includes material returned block upperpush rod, stripper and elastic mechanism under whole crimping, described material returned block upperpush rod has two and is fixed on whole crimping upper padding plate both sides, under whole crimping, be embedded in can be up and down in whole crimping lower installation board for stripper, and below stripper under whole crimping, both sides are respectively provided with an elastic mechanism.
6. reinforced draw ring according to claim 3 special equipment it is characterised in that：The discharge end at described whole crimping and shaping reinforcement station is provided with material-supporting device, material-supporting device includes retainer block upperpush rod, whole crimping retainer block and elastic mechanism, described retainer block upperpush rod has two and is fixed on whole crimping upper padding plate both sides, two whole crimping retainer block activities are embedded in whole crimping lower installation board both sides, are mounted on an elastic mechanism below each whole crimping retainer block.
7. the reinforced draw ring according to claim 3 or 4 or 5 or 6 special equipment it is characterised in that：Described elastic mechanism includes spring housing and the movable spring embedding in spring housing, spring pressure head, and described spring is set in die shoe, and spring pressure head is arranged on spring top.
8. reinforced draw ring according to claim 3 special equipment it is characterised in that：Described whole crimping lower installation board two side roof part is symmetrically arranged with for spacing left cover and right cover plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510475344.2A CN106424325B (en) | 2015-08-06 | 2015-08-06 | A kind of production technology and special equipment of reinforced pull ring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510475344.2A CN106424325B (en) | 2015-08-06 | 2015-08-06 | A kind of production technology and special equipment of reinforced pull ring |
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| CN106424325A true CN106424325A (en) | 2017-02-22 |
| CN106424325B CN106424325B (en) | 2019-07-26 |
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| CN201510475344.2A Active CN106424325B (en) | 2015-08-06 | 2015-08-06 | A kind of production technology and special equipment of reinforced pull ring |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107876631A (en) * | 2017-12-28 | 2018-04-06 | 东莞市长东模具有限公司 | A kind of collection cut-out, shaping and volume circle are machined in integral die device |
| CN110523848A (en) * | 2019-09-18 | 2019-12-03 | 深圳嘉信源科技实业有限公司 | A kind of progressive die of earphone front shroud fixed steelring |
| CN110976628A (en) * | 2019-11-25 | 2020-04-10 | 遂宁粤丰不锈钢有限公司 | Full-automatic stainless steel pull ring forming process and forming system thereof |
| CN110976627A (en) * | 2019-11-25 | 2020-04-10 | 遂宁粤丰不锈钢有限公司 | Semi-automatic stainless steel pull ring forming process and forming die thereof |
| CN112108565A (en) * | 2020-09-04 | 2020-12-22 | 江苏艾锐博精密金属科技有限公司 | Bidirectional flattening product structure and flattening process thereof |
| CN112756476A (en) * | 2020-12-14 | 2021-05-07 | 英联金属科技(汕头)有限公司 | Pull ring manufacturing die, device and method |
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| CN1200771A (en) * | 1995-09-18 | 1998-12-02 | 凯泽铝和化学公司 | Method for making beverage can, its top sheet and its pull ring |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107876631A (en) * | 2017-12-28 | 2018-04-06 | 东莞市长东模具有限公司 | A kind of collection cut-out, shaping and volume circle are machined in integral die device |
| CN110523848A (en) * | 2019-09-18 | 2019-12-03 | 深圳嘉信源科技实业有限公司 | A kind of progressive die of earphone front shroud fixed steelring |
| CN110976628A (en) * | 2019-11-25 | 2020-04-10 | 遂宁粤丰不锈钢有限公司 | Full-automatic stainless steel pull ring forming process and forming system thereof |
| CN110976627A (en) * | 2019-11-25 | 2020-04-10 | 遂宁粤丰不锈钢有限公司 | Semi-automatic stainless steel pull ring forming process and forming die thereof |
| CN110976627B (en) * | 2019-11-25 | 2022-06-03 | 遂宁粤丰不锈钢有限公司 | Semi-automatic stainless steel pull ring forming process and forming die thereof |
| CN112108565A (en) * | 2020-09-04 | 2020-12-22 | 江苏艾锐博精密金属科技有限公司 | Bidirectional flattening product structure and flattening process thereof |
| CN112756476A (en) * | 2020-12-14 | 2021-05-07 | 英联金属科技(汕头)有限公司 | Pull ring manufacturing die, device and method |
| CN112756476B (en) * | 2020-12-14 | 2022-11-29 | 英联金属科技(汕头)有限公司 | Pull ring manufacturing die, device and method |
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| Publication number | Publication date |
|---|---|
| CN106424325B (en) | 2019-07-26 |
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