CN202803877U - Secondary and tertiary continuous progressive pneumatic stretching device - Google Patents
Secondary and tertiary continuous progressive pneumatic stretching device Download PDFInfo
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- CN202803877U CN202803877U CN 201220231185 CN201220231185U CN202803877U CN 202803877 U CN202803877 U CN 202803877U CN 201220231185 CN201220231185 CN 201220231185 CN 201220231185 U CN201220231185 U CN 201220231185U CN 202803877 U CN202803877 U CN 202803877U
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Abstract
The utility model relates to a secondary and tertiary continuous progressive pneumatic stretching device. The secondary and tertiary continuous progressive pneumatic stretching device comprises secondary and tertiary stretching modules and a guide positioning device, wherein the secondary stretching module comprises a secondary stretching edge pressing sleeve, a secondary stretching male die and a secondary stretching female die; the tertiary stretching module comprises a tertiary stretching edge pressing sleeve, a tertiary stretching male die and a tertiary stretching female die; the guide positioning device comprises a groove-type inlet guide plate, two parallel secondary stretching positioning side plates and two parallel tertiary stretching positioning side plates, which are connected in sequence; the width of the groove-type inlet guide plate and the distance between the inner walls of the two secondary stretching positioning side plates are slightly greater than the outer diameter of a workpiece to be stretched; the distance between the inner walls of the two tertiary stretching positioning side plates is greater than the outer diameter of the workpiece subjected to secondary stretching; and secondary stretching positioning blocks and tertiary stretching positioning blocks are arranged on the inner walls of the secondary stretching positioning side plates and the tertiary stretching positioning side plates respectively.
Description
Technical field
The utility model relates to a kind of pneumatic stretching device, particularly relates to a kind of pneumatic stretching device for the bottle cap moulding.
Background technology
In the process of aluminum bottle cover, punching stretch is the first operation of lid moulding, and short punching stretch of Gai Kejing can be finished generally speaking, but middle cover needs through succeeding stretch, and high lid needs just can finish through three times or more times stretching.Present stretching device is to fill a mold on the punch press to finish the one-off drawing operation, finishing for middle cover, the whole punching stretch process of high lid then needs two and above punch press to finish successively respectively two, three times to stretch or more times stretching operation, and equipment investment is large, the operation circulation causes that efficient is low, personnel demand large, it is large to take production site.
The utility model content
The technical problems to be solved in the utility model provides two, three continuous grading pneumatic stretching devices that a kind of occupied ground is little, production efficiency is high.
The utility model two, three continuous grading pneumatic stretching devices, comprise the succeeding stretch module, three stretching modules and guide locating device provided, described succeeding stretch module comprises succeeding stretch flanging cover, succeeding stretch punch and succeeding stretch die, described three stretching modules comprise stretching flanging cover three times, three stretching convex die and three stretching dies, described two, three stretching flanging cover and two, three times stretching convex die moves up and down under the drive of slider of punch synchronously, described two, three stretching dies be fixed on the workbench and the upper surface concordant with work top, described guide locating device provided being fixed on the workbench, comprise that the grooved that links to each other successively enters guide plate, two blocks of succeeding stretch location side plates that be arranged in parallel and two three times of be arrangeding in parallel stretch and locate side plate, described two, the location side plate that stretches for three times is parallel with the ledge that grooved enters guide plate, grooved enters the width of guide plate and the spacing of two succeeding stretch location side plate inwalls is slightly larger than the external diameter for the treatment of stretched part, the spacing of described two three location side plate inwalls that stretch is slightly larger than the external diameter of workpiece behind the succeeding stretch, described two, stretch for three times to locate on the side plate inwall and be respectively equipped with succeeding stretch locating piece and three stretching locating pieces, two, enter into respectively two when three times stretching flanging cover moves downward, stretch for three times and locate in the side plate described two, three stretching locating pieces are respectively with two, three stretching flanging cover outer wall is tangent.
The utility model two, three continuous grading pneumatic stretching devices, wherein said succeeding stretch locating piece are positioned at succeeding stretch location side plate and the side plate junction, location that stretches for three times.
The utility model two, three continuous grading pneumatic stretching devices, the height that wherein said grooved enters the height of guide plate ledge and succeeding stretch location side plate is slightly larger than the height for the treatment of stretched part, and the height of described three location side plates that stretch is slightly larger than the height of workpiece behind the succeeding stretch.
The utility model two, three continuous grading pneumatic stretching devices, the top that wherein said grooved enters guide plate is provided with the guide plate lid, two, side plate top, three stretching location is respectively equipped with succeeding stretch positioning cover plate and three stretching positioning cover plates, be respectively equipped with on described two, three stretching positioning cover plates and be suitable for the hole that two, three stretching flanging covers pass through, hole on the described succeeding stretch positioning cover plate is provided with the opening towards three stretching positioning cover plates, and the bore of described opening is identical with the spacing of two three location side plate inwalls that stretch.
The utility model two, three continuous grading pneumatic stretching devices, wherein said succeeding stretch positioning cover plate enters the endwise skew of guide plate one side near grooved, and described three stretching positioning cover plates are near the endwise skew of succeeding stretch positioning cover plate one side.
The utility model two, three continuous grading pneumatic stretching devices, wherein said succeeding stretch location side plate is provided with the succeeding stretch gas hole near the side that grooved enters guide plate, and a side of described three the close succeeding stretch of location side plate location side plates that stretch is provided with the stretch blow hole three times.
The utility model two, three continuous grading pneumatic stretching devices, wherein said guide plate covers and has oblong hole.
The utility model two, three continuous grading pneumatic stretching devices, wherein be set up in parallel many group succeeding stretch modules, three stretching modules and will treat that the stretched part transmission navigates to the guide locating device provided of two, three stretching stations, described many group succeeding stretch modules, three stretching modules move up and down under the drive of slider of punch synchronously.
The utility model two, three continuous grading pneumatic stretching device differences from prior art are the utility model two, three continuous grading pneumatic stretching devices, two, three stretching modules are installed in the operation that stretches that moves up and down synchronously on the same slider of punch, and treat that by guide locating device provided assurance stretched part accurately transmits the location between two, three stretching stations.
Below in conjunction with accompanying drawing two, three continuous grading pneumatic stretching devices of the present utility model are described further.
Description of drawings
Fig. 1 is the cutaway view before the utility model two, three the continuous grading pneumatic stretching device punching presses;
Fig. 2 is the cutaway view in the utility model two, three the continuous grading pneumatic stretching device punching courses;
Fig. 3 is the guide locating device provided top view in A place among Fig. 2;
Fig. 4 is the top view behind guide locating device provided removal guide plate lid and two, three the stretching positioning cover plates.
The specific embodiment
As shown in Figure 1, the succeeding stretch module of the utility model two, three continuous grading pneumatic stretching devices comprises succeeding stretch flanging cover 7a, succeeding stretch punch 9a and succeeding stretch die 8a, three times stretching module comprises three stretching flanging cover 7b, three stretching convex die 9b and three stretching die 8b, also comprise in addition cylinder 1, cope match-plate pattern 4 and workbench 5, cope match-plate pattern 4 is fixed on the lower surface of cylinder 1.Be provided with reciprocating succeeding stretch piston 2a and three stretching piston 2b in the cylinder 1, be fixedly connected with succeeding stretch convex mould base 6a and three stretching convex die seat 6b on the cope match-plate pattern 4, succeeding stretch punch 9a and three stretching convex die 9b are fixedly connected on respectively the lower end of succeeding stretch convex mould base 6a and three stretching convex die seat 6b by the first air vent screw 13a, the second air vent screw 13b, the upper surface of three stretching convex die 9b is provided with cutting ring 21, and the external diameter of cutting ring 21 is identical with the external diameter of three stretching convex die 9b.Succeeding stretch flanging cover 7a and three stretching flanging cover 7b are set in the outside of succeeding stretch punch 9a and three stretching convex die 9b, succeeding stretch flanging cover 7a is connected with three stretching piston 2b with succeeding stretch piston 2a with three stretching push rod 3b by succeeding stretch push rod 3a respectively with the upper end of three stretching flanging cover 7b, and succeeding stretch push rod 3a and three stretching push rod 3b pass respectively succeeding stretch convex mould base 6a and three stretching convex die seat 6b.
Succeeding stretch die 8a and three stretching die 8b are fixed on the workbench 5, its upper surface is concordant with the upper plane of workbench 5 and corresponding with succeeding stretch punch 9a and three stretching convex die 9b respectively, and the lower end of three stretching die 8b is provided with the feed opening 19 that communicates with it.
Also be connected with on the lower surface of workbench 5 with coaxial the taking off of succeeding stretch die 8a and expect sleeve 10, taking off material sleeve 10 is the up big and down small T-shape cylinder of an internal diameter, the internal diameter of its large footpath and succeeding stretch die 8a is identical and be connected, the lower end inwall arranges screw thread and matches with adjusting screw(rod) 18, and adjusting screw(rod) 18 centers are provided with through hole.Take off in the material sleeve 10 and also be provided with material discharging rod 11, material discharging rod 11 is the up big and down small T-shape bar of an external diameter, its large footpath is identical with the large footpath of taking off material sleeve 10, path is identical with the through hole internal diameter of adjusting screw(rod) 18, cover has spring 12 on the outer wall of material discharging rod 10 paths part, one end of spring 12 is against on the lower surface of material discharging rod 10 large diameter portions, and the other end is against on the upper surface of adjusting screw(rod) 18.
Also be fixed with guide locating device provided on the upper plane of workbench 5, can find out from Fig. 1,3,4, the guide locating device provided grooved that links to each other successively that comprises enters guide plate 14, two succeeding stretch location side plate 22a that be arranged in parallel and two three stretching location side plate 22b that be arranged in parallel, and two, three times stretch location side plate 22a, 22b are parallel with the ledge that grooved enters guide plate.Grooved enters the width of guide plate 14 and the spacing of two succeeding stretch location side plate 22a inwalls is slightly larger than the external diameter for the treatment of stretched part, guarantees to treat that stretched part enters when transmitting between guide plate 14 and the succeeding stretch location side plate 22a and can reduce unnecessary move left and right by making again workpiece remain on same straight line smoothly at grooved.The spacing of two three location side plate 22b inwalls that stretch is slightly larger than the external diameter of workpiece behind the succeeding stretch, guarantee succeeding stretch after workpiece can be smoothly by making again workpiece remain on the unnecessary move left and right of same straight line minimizing in Xiang Sanci stretching station transmittance process.Two, location side plate 22a stretches for three times, be respectively equipped with succeeding stretch locating piece 20a and three stretching locating piece 20b on the 22b inwall, two, three stretching flanging cover 7a, when moving downward, 7b enters into respectively two, location side plate 22a stretches for three times, among the 22b, two, three stretching locating piece 20a, 20b is respectively with two, three stretching flanging cover 7a, the 7b outer wall is tangent, the external diameter of succeeding stretch flanging cover 7a is identical with the internal diameter with stretched part, when treating that stretched part is delivered to succeeding stretch locating piece 20a place and tangent being blocked by it of succeeding stretch locating piece 20a stop to move ahead, treat that stretched part is positioned on the succeeding stretch station just this moment, descending the entering into of succeeding stretch flanging cover 7a treated stretched part, preferably succeeding stretch locating piece 20a is arranged and be positioned at succeeding stretch location side plate 22a and stretch side plate 22b junction, location for three times, so that workpiece directly enters into after by succeeding stretch on the transmission channels that three location side plate 22b that stretch identical with its bore form, can not produce unnecessary move left and right.The internal diameter of workpiece is identical behind the external diameter of three stretching flanging covers 7b and the succeeding stretch, when workpiece behind the succeeding stretch is delivered to three stretching locating piece 20b places and three tangent being blocked by it of stretching locating piece 20b stop to move ahead, this moment, workpiece was positioned on three stretching stations just, and descending the entering into of three stretching flanging cover 7b treated stretched part.
Treat that for better promoting stretched part is in the transmission of two, three stretching stations, side plate 22a is provided with succeeding stretch gas hole 17a near the side that grooved enters guide plate 14 in the succeeding stretch location, be symmetricly set on the both sides of succeeding stretch location side plate 22a, force and treat that stretched part moves forward.Side at three the close succeeding stretch of location side plate 22b location side plate 22a that stretch is provided with stretch blow hole 17b three times, be symmetricly set on the both sides of three location side plate 22b that stretch, the workpiece that blows behind the succeeding stretch moves forward, and the ring leftover bits and pieces of material that cutting ring 21 downcuts after simultaneously three times being stretched blows away.
For preventing that workpiece from producing up and down play under the thrust mutually in transmittance process, the height that grooved enters the height of guide plate ledge and succeeding stretch location side plate 22a is set is slightly larger than the height for the treatment of stretched part, the height of location side plate 22b of stretching for three times is slightly larger than the height of workpiece behind the succeeding stretch, and grooved enter guide plate 14 above guide plate lid 15 is set, two, location side plate 22a stretches for three times, the 22b top also arranges respectively succeeding stretch positioning cover plate 16a and three stretching positioning cover plate 16b, and make succeeding stretch positioning cover plate 16a enter the endwise skew of guide plate 14 1 sides near grooved, the endwise skew of three close succeeding stretch positioning cover plate 16a one sides of stretching positioning cover plate 16b treats that conveniently stretched part enters.Have oblong hole on the guide plate lid 15, be convenient to observe the state for the treatment of stretched part, two, be respectively arranged with on three stretching positioning cover plate 16a, the 16b and be suitable for the hole that two, three stretching flanging cover 7a, 7b pass through, because workpiece highly increases behind succeeding stretch, hole on succeeding stretch positioning cover plate 16a arranges the opening towards three stretching positioning cover plates 16, the bore of opening is identical with the spacing of two three location side plate 22b inwalls that stretch, in order to can locate on the transmission channels of side plate 22b composition by entering three stretchings smoothly through the workpiece behind the succeeding stretch.
As shown in Figure 2, the course of work of the utility model two, three continuous grading pneumatic stretching devices is such:
It is motionless that workbench 5 keeps, and cylinder 1, cope match-plate pattern 4, two, three stretching flanging cover 7a, 7b and two, three stretching convex die 9a, 9b follow slider of punch integral body and do and pump.
The semi-finished product that one-off drawing obtains are transported to guide locating device provided the place ahead through the separator screening, being arranged in order grooved enters on the guide plate 14, being positioned at the workpiece that the workpiece of front end entered later pushes away forward one by one, when being blocked by succeeding stretch locating piece 20a during to succeeding stretch locating piece 20a place, workpiece movable stops to move ahead, succeeding stretch flanging this moment cover 7a moves down under slider of punch drives and treats above the stretched part, continuing descending entering into treats in the stretched part until the upper surface of succeeding stretch die 8a, the top planes of workpiece is pressed on the succeeding stretch die 8a upper surface with setting pressure, succeeding stretch flanging cover 7a no longer moves down, cope match-plate pattern 4 drives succeeding stretch convex mould base 6a and continues descending, being installed on succeeding stretch punch 9a on the succeeding stretch convex mould base 6a enters among the succeeding stretch die 8a and carries out the succeeding stretch operation, the reaction force of succeeding stretch flanging cover 7a is up along cylinder 1 by succeeding stretch push rod 3a promotion succeeding stretch piston 2a simultaneously, but remain the pressure-pad-force to workpiece, it is descending with succeeding stretch punch 9a under the pressure of succeeding stretch punch 9a to be located at the material discharging rod 11 that takes off in the material sleeve 10, Compress Spring 12, slider of punch comes downwards to desired location, and the succeeding stretch action is finished.Slider of punch band dynamic air cylinder 1 and cope match-plate pattern 4 beginnings are up, spring 12 is upheld, lid among the promotion succeeding stretch die 8a and material discharging rod 11 together go upward to succeeding stretch die 8a with succeeding stretch punch 9a upper surface, this timer is blown downwards by succeeding stretch air vent screw 13a and is made the workpiece behind the succeeding stretch break away from succeeding stretch punch 9a, slider of punch band dynamic air cylinder 1 and cope match-plate pattern 4 continue up and drive rise of succeeding stretch flanging cover 7a, meanwhile staying workpiece behind the succeeding stretch on the workbench 5 is entered by grooved and treats stretched part thrust and two on the guide plate 14, three stretch blow hole 17a, move to three stretching stations under the airflow function among the 17b, when workpiece behind the succeeding stretch is delivered to three stretching locating piece 20b places, blocked by three stretching locating piece 20b and stop to move ahead, just be positioned at this moment on three stretching stations.
Carry out in the process in above-mentioned succeeding stretch module, three times stretching module also moves up and down under the drive of slider of punch synchronously, just first circulation is carried out empty beating of circulation without workpiece in place, when the workpiece of finishing when first succeeding stretch enters three stretching stations, also enter the stretched part for the treatment of afterwards on the synchronous succeeding stretch station, at this moment, two, three stretching modules carry out simultaneously.Wherein three stretching and punching processes are specifically such: blocked by three stretching locating piece 20b when time stretching locating piece 20b place of workpiece movable to three behind the succeeding stretch and stop to move ahead, three stretching flanging this moment cover 7b moves down into above the workpiece under slider of punch drives, continue descending entering into behind the succeeding stretch in the workpiece until the upper surface of three stretching die 8b, the top planes of workpiece is pressed on three stretching die 8b upper surfaces with setting pressure, three stretching flanging cover 7b no longer moves down, cope match-plate pattern 4 drives three stretching convex die seat 6b and continues descending, being installed on three three stretching convex die 9b on the stretching convex die seat 6b enters among three stretching die 8b and carries out three stretching operations, the reaction force of simultaneously three stretching flanging cover 7b is up along cylinder 1 by three stretching piston 2b of three stretching push rod 3b promotions, remain simultaneously the pressure-pad-force to workpiece, slider of punch comes downwards to desired location, and three actions that stretch are finished.Slider of punch band dynamic air cylinder 1 and cope match-plate pattern 4 beginnings are up, when being installed in three cutting rings 21 on the stretching convex die 9b through three stretching die 8b upper surfaces, the ring limit that is pressed under three stretching flanging cover 7b is cut off, blowing downwards by three stretching air vent screw 13b with timer makes finished parts break away from three stretching convex die 9b to stay among three stretching die 8b, and slider of punch band dynamic air cylinder 1 and cope match-plate pattern 4 continue up and drive rise of three stretching flanging cover 7b.The ring limit leftover bits and pieces that downcuts is stayed on three stretching die 8b upper surfaces, by the air-flow among three stretch blow hole 17b it is blown away, and stays three finished parts among the stretching die 8b and is released from feed opening 19 when next one stretching operation.So far, whole two, three continuous grading stretching operations are finished, and slider of punch continues up and down reciprocatingly running, begins next cycle operation.
On same punch press, can be set up in parallel many group succeeding stretch modules, three stretching modules and guide locating device provided, organize the succeeding stretch module, three stretching modules move up and down synchronously more under the drive of slider of punch.
Above-described embodiment is described preferred embodiment of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that those of ordinary skills make the technical solution of the utility model all should fall in the definite protection domain of the utility model claims.
Claims (8)
1. one kind two, three continuous grading pneumatic stretching devices, comprise the succeeding stretch module, three stretching modules and guide locating device provided, described succeeding stretch module comprises succeeding stretch flanging cover (7a), succeeding stretch punch (9a) and succeeding stretch die (8a), described three stretching modules comprise three stretching flanging covers (7b), three stretching convex die (9b) and three stretching dies (8b), described two, three stretching flanging cover (7a, 7b) and two, three stretching convex die (9a, 9b) under the drive of slider of punch, move up and down synchronously, described two, three stretching die (8a, it is upper and the upper surface is concordant with work top 8b) to be fixed on workbench (5), described guide locating device provided being fixed on the workbench (5), comprise that the grooved that links to each other successively enters guide plate (14), two blocks of succeeding stretch location side plates (22a) that be arranged in parallel and two three times of be arrangeding in parallel stretch and locate side plate (22b), described two, location side plate (22a stretches for three times, 22b) to enter the ledge of guide plate parallel with grooved, grooved enters the width of guide plate (14) and the spacing of two succeeding stretch location side plate (22a) inwalls is slightly larger than the external diameter for the treatment of stretched part, the spacing of described two three location side plate (22b) inwalls that stretch is slightly larger than the external diameter of workpiece behind the succeeding stretch, described two, location side plate (22a stretches for three times, 22b) be respectively equipped with succeeding stretch locating piece (20a) and three stretching locating pieces (20b) on the inwall, two, three stretching flanging cover (7a, enter into respectively two when 7b) moving downward, location side plate (22a stretches for three times, 22b), described two, three stretching locating piece (20a, 20b) respectively with two, three stretching flanging cover (7a, 7b) outer wall is tangent.
2. two, three continuous grading pneumatic stretching devices according to claim 1 is characterized in that: described succeeding stretch locating piece (20a) is positioned at succeeding stretch location side plate (22a) and three side plate (22b) junctions, location that stretch.
3. two, three continuous grading pneumatic stretching devices according to claim 1 and 2, it is characterized in that: the height that described grooved enters the height of guide plate (14) ledge and succeeding stretch location side plate (22a) is slightly larger than the height for the treatment of stretched part, and the height of described three location side plates (22b) that stretch is slightly larger than the height of workpiece behind the succeeding stretch.
4. according to claim 3 two, three continuous grading pneumatic stretching devices, it is characterized in that: the top that described grooved enters guide plate (14) is provided with guide plate lid (15), two, location side plate (22a stretches for three times, 22b) top is respectively equipped with succeeding stretch positioning cover plate (16a) and three stretching positioning cover plates (16b), described two, three stretching positioning cover plate (16a, be respectively equipped with 16b) and be suitable for two, three stretching flanging cover (7a, the hole of 7b) passing through, hole on the described succeeding stretch positioning cover plate (16a) is provided with the opening towards three stretching positioning cover plates (16), and the bore of described opening is identical with the spacing of two three location side plate (22b) inwalls that stretch.
5. two, three continuous grading pneumatic stretching devices according to claim 4, it is characterized in that: described succeeding stretch positioning cover plate (16a) enters the endwise skew of guide plate (14) one sides near grooved, and described three stretching positioning cover plates (16b) are near the endwise skew of succeeding stretch positioning cover plate (16a) side.
6. two, three continuous grading pneumatic stretching devices according to claim 3, it is characterized in that: described succeeding stretch location side plate (22a) is provided with succeeding stretch gas hole (17a) near the side that grooved enters guide plate (14), and a side of described three close succeeding stretch location side plates of location side plate (22b) (22a) that stretch is provided with three stretch blow holes (17b).
7. two, three continuous grading pneumatic stretching devices according to claim 4 is characterized in that: have oblong hole on the described guide plate lid (15).
8. two, three continuous grading pneumatic stretching devices according to claim 1, it is characterized in that: be set up in parallel many group succeeding stretch modules, three stretching modules and will treat that the stretched part transmission navigates to the guide locating device provided of two, three stretching stations, described many group succeeding stretch modules, three stretching modules move up and down under the drive of slider of punch synchronously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220231185 CN202803877U (en) | 2012-05-22 | 2012-05-22 | Secondary and tertiary continuous progressive pneumatic stretching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220231185 CN202803877U (en) | 2012-05-22 | 2012-05-22 | Secondary and tertiary continuous progressive pneumatic stretching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202803877U true CN202803877U (en) | 2013-03-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220231185 Expired - Lifetime CN202803877U (en) | 2012-05-22 | 2012-05-22 | Secondary and tertiary continuous progressive pneumatic stretching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202803877U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105499392A (en) * | 2016-01-07 | 2016-04-20 | 舟山市7412工厂 | Die for manufacturing bowl-shaped piston |
| CN105499429A (en) * | 2016-01-07 | 2016-04-20 | 舟山市7412工厂 | Bowl-shaped plug manufacturing method |
| CN110180939A (en) * | 2019-07-09 | 2019-08-30 | 上海誉伽文具有限公司 | A kind of camera bracket progressive die cold punching stretcher |
-
2012
- 2012-05-22 CN CN 201220231185 patent/CN202803877U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105499392A (en) * | 2016-01-07 | 2016-04-20 | 舟山市7412工厂 | Die for manufacturing bowl-shaped piston |
| CN105499429A (en) * | 2016-01-07 | 2016-04-20 | 舟山市7412工厂 | Bowl-shaped plug manufacturing method |
| CN110180939A (en) * | 2019-07-09 | 2019-08-30 | 上海誉伽文具有限公司 | A kind of camera bracket progressive die cold punching stretcher |
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Granted publication date: 20130320 |