CN114589276B - Spring processing equipment - Google Patents
Spring processing equipment Download PDFInfo
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- CN114589276B CN114589276B CN202210249952.1A CN202210249952A CN114589276B CN 114589276 B CN114589276 B CN 114589276B CN 202210249952 A CN202210249952 A CN 202210249952A CN 114589276 B CN114589276 B CN 114589276B
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- spring
- piece
- steel wire
- clamping
- clamping rod
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F35/00—Making springs from wire
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F11/00—Cutting wire
- B21F11/005—Cutting wire springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F35/00—Making springs from wire
- B21F35/02—Bending or deforming ends of coil springs to special shape
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wire Processing (AREA)
Abstract
The application relates to a spring processing device, which comprises the following steps: forming springs on a spring coiling machine; applying two oppositely-overlapped pressing forces at the joint of the steel wire and the spring, positioning the steel wire, and separating the force application position of the pressing force from the spring; applying a torsion force towards the connection part on the first spring coil connected with the steel wire, wherein the application position is far away from the connection part of the first spring coil and the steel wire, so that the spring turns over along the axis of the connection part towards the application direction of the torsion force and the connection part of the steel wire and the spring is twisted off; the torsion-broken portion of the spring after being separated from the wire is subjected to surface treatment. Through torsion with the spring for the steel wire, utilize the fatigue characteristic of metal to make steel wire and spring mutually separate, no longer need utilize the cutter to process at the in-process of both separation, be difficult for producing the breach that the cutter left at the spring surface this moment, make the spring be difficult for producing the phenomenon of stress concentration in subsequent use, make the spring be difficult for breaking.
Description
Technical Field
The application relates to the technical field of spring processing, in particular to a spring processing method and spring processing equipment.
Background
Springs are typically formed during production using a spring machine, after which the wire is cut with a cutter to separate the formed spring from the un-formed wire.
However, when the cutter cuts the wire, the cutting direction of the cutter is generally along the radial direction of the spring, and the cutter presses the wire during the cutting process of the cutter, so that the cut part of the spring generates fine protrusions along the axial direction of the spring. The protrusion will contact the second coil of the spring, and during subsequent use of the spring, the protrusion will create a notch in the second coil of the spring that will cause stress concentrations that tend to break the spring at this point.
Meanwhile, in the cutting process of the cutter, the first spring coil and the second spring coil of the spring are tightly attached, when the cutter is used for separating the first spring coil from the steel wire, the cutter is easy to contact with the second spring coil, gaps are formed in the second spring coil, and stress concentration is also caused by the gaps, so that the spring is easy to break at the gaps.
It is therefore necessary to propose a new solution to the above-mentioned problems.
Disclosure of Invention
In order to avoid damage to the spring itself caused by the operation of separating the spring from the steel wire during the process of separating the spring from the steel wire and the subsequent use, the application provides a spring processing method
The spring processing method provided by the application adopts the following technical scheme:
a spring processing method and a spring processing device comprise the following steps:
forming springs on a spring coiling machine;
applying two oppositely-overlapped pressing forces at the joint of the steel wire and the spring, positioning the steel wire, and separating the force application position of the pressing force from the spring;
applying a torsion force to the first spring coil connected with the steel wire, wherein the torsion force is towards the connection position and away from the steel wire, and the application position is away from the connection position of the first spring coil and the steel wire, so that the spring turns over along the axis of the connection position towards the application direction of the torsion force and the connection position of the steel wire and the spring is twisted off;
the torsion-broken portion of the spring after being separated from the wire is subjected to surface treatment.
Through adopting above-mentioned technical scheme, when separating spring and steel wire, through torsion spring for the steel wire, utilize the fatigue characteristic of metal to make steel wire and spring mutually separate, no longer need utilize the cutter to process at the in-process of both separations, be difficult for producing the breach that the cutter left on the spring surface this moment, the junction of spring and steel wire also is difficult for producing the protrusion because of deformation, makes the difficult phenomenon that produces stress concentration of spring in subsequent use, makes the difficult fracture of spring.
The utility model provides a spring processing equipment, includes the support piece that is used for supporting the steel wire that is connected in the spring, is used for compressing tightly the compressing tightly piece of steel wire and promotes the bending mechanism of spring upset, support piece can be fixed in on the spring coiling machine, compressing tightly piece and bending mechanism all can slide and set up on the spring coiling machine, support piece upper end can the butt be in the lower extreme lateral wall that the steel wire is close to the junction of spring, compressing tightly piece lower extreme can the butt be in the upper end lateral wall that the steel wire is close to the junction of spring.
Through adopting above-mentioned technical scheme, utilize compressing tightly piece and support piece to press from both sides the position that the steel wire is close to the spring tightly, make the position and the shape of the steel wire of this department be difficult for taking place to change, promote the spring and rotate for the steel wire afterwards, make the junction of spring and steel wire produce torsion, make the junction of steel wire and spring surpass fatigue strength and fracture, no longer need use the cutter in the in-process with steel wire and spring separation to be difficult for leaving breach or protruding on the spring, make the follow-up use of spring be difficult for receiving the influence.
Optionally: the bending mechanism comprises a jacking block vertically sliding on the spring coiling machine and a jacking driving piece for pushing the jacking block to vertically move, the jacking driving piece is arranged on the spring coiling machine, the driving end of the jacking driving piece is connected with the jacking block, the upper end of the side wall, far away from the steel wire, of the jacking block is obliquely arranged and can be abutted to the end face, close to the steel wire, of the spring, and the position, abutting against the spring, of the jacking block is far away from the torsion breaking position of the spring and the steel wire.
Through adopting above-mentioned technical scheme, the axis of rotation that makes the guide coincides with the axis of rotation of the torsion-break department of spring, makes the spring twist reverse the position in the bending process more translocate in the junction of spring and steel wire, makes the difficult deformation that takes place of spring other positions.
Optionally: the bending mechanism comprises a clamping piece which can clamp one end of the spring close to the steel wire, a guide piece which guides the rotation of the clamping piece, and a bending driving piece which drives the guide piece to rotate, wherein the clamping piece is arranged on the guide piece, the clamping piece can be simultaneously abutted to two sides of the steel wire at the end part of the spring, the guide piece is connected onto a spring coiling machine, the rotation axis of the guide piece is coincident with the axis of the torsion breaking part of the spring and the steel wire, the bending driving piece is arranged on the spring coiling machine, and the driving end of the bending driving piece is connected with the guide piece.
Through adopting above-mentioned technical scheme, utilize the holder to be close to the position centre gripping of steel wire junction with the spring, afterwards only apply force to the position of spring by the holder centre gripping under the drive of guide to torsion in-process spring other position with the spring is difficult for producing deformation, can carry out the twist-off processing to the spring of different hardness this moment, increase the application scope of this equipment.
Optionally: the clamping piece comprises a first clamping rod, a second clamping rod and a clamping driving piece for driving the first clamping rod and the second clamping rod to be close to or far away from each other, the first clamping rod and the second clamping rod are slidably arranged on the guide piece, the first clamping rod and the second clamping rod can be respectively abutted to two sides, away from each other, of a steel wire of the spring, and the first clamping rod and the second clamping rod are close to the supporting piece and the pressing piece.
Through adopting above-mentioned technical scheme, press from both sides the tip that is close to the steel wire with the spring through first clamping lever and second clamping lever tightly, make the spring only receive the atress here at the in-process of buckling, make the spring be difficult for producing deformation with the in-process of steel wire separation.
Optionally: the first clamping rod and the second clamping rod are clamped on the side wall of the spring, and the side wall of the spring is provided with a containing groove which can be attached to the spring.
Through adopting above-mentioned technical scheme, utilize the holding tank to increase the area of contact between first clamping lever and second clamping lever and the spring, make the tip that the spring is close to the steel wire be when receiving the pressure that first clamping lever and second clamping lever applyed, the tip of spring is difficult for producing deformation, makes the whole shape of spring be difficult for taking place deformation.
Optionally: the first clamping rod and the second extending piece are connected to the end part of the clamping driving piece, far away from the position where the spring is twisted off, and the first clamping rod penetrates through a spiral opening of the spring, far away from the twisting off position.
Through adopting above-mentioned technical scheme, first clamping lever and second clamping lever clamp the spring from the one end that the spring is close to the steel wire, and first clamping lever and second clamping lever and spring connection's position are shorter from the interval of both positions of being connected with the centre gripping driving piece this moment to both are difficult for producing deformation when the guide drives first clamping lever and second clamping lever and rotate, thereby make the spring be difficult for receiving the influence from the separation process on the steel wire.
Optionally: the first clamping rod and the second clamping rod are arranged at one end close to the spring and close to the supporting piece, a sliding piece and a sliding driving piece for driving the sliding piece to move are arranged on the guiding piece, the driving end of the sliding driving piece is connected with the sliding piece, and the clamping piece is arranged on the sliding piece.
Through adopting above-mentioned technical scheme, make first clamping lever and second clamping lever keep away from the spring at the in-process that the spring was convoluteed, first clamping lever and second clamping lever are moved towards the spring and press from both sides the spring under the drive of the drive piece that slides after the processing of accomplishing the spring, leave the clearance between the in-process clamping piece that the spring was convoluteed and the spring to make the coiling process of spring be difficult for receiving the influence.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the steel wire is separated from the formed spring, the spring is twisted relative to the steel wire, and a cutter is not needed to be used for separating the spring from the steel wire, so that the surface of the steel wire is not easily influenced by the cutter to generate a notch, and the subsequent use of the spring is not easily broken due to the fact that stress is concentrated in the notch;
2. the end part of the spring, which is close to the steel wire, is clamped and applied with force by the first clamping rod and the second clamping rod, and the stressed position of the spring is positioned between the first clamping rod and the second clamping rod, so that the rest parts of the spring are not easy to deform.
Drawings
Fig. 1 is a schematic view for showing a connection state of a spring and a wire according to the present application;
FIG. 2 is a schematic diagram of the application position for showing two pressing forces;
FIG. 3 is a schematic diagram of the present application showing the force application position during spring torsion;
FIG. 4 is a schematic view for showing the overall structure of embodiment 1 of the present application;
FIG. 5 is a schematic view of embodiment 2 of the present application showing the clamping positions of the first clamping lever and the second clamping lever to the spring;
fig. 6 is a schematic diagram of embodiment 3 of the present application for showing the clamping positions of the first clamping rod and the second clamping rod to the spring.
In the figure, 1, a support; 2. a pressing member; 21. compressing the driving piece; 3. a bending mechanism; 31. a jacking block; 32. jacking the driving piece; 33. a clamping member; 331. a first clamping lever; 332. a second clamping rod; 333. a receiving groove; 34. clamping the driving member; 4. a guide member; 41. bending the driving piece; 5. a slider; 51. a slip driving member; 6. a steel wire; 7. a spring; 8. the joint.
Description of the embodiments
The present application is described in further detail below with reference to the accompanying drawings.
The spring processing method disclosed by the application, as shown in fig. 1, comprises the following steps:
shaping the spring 7 on a spring coiling machine, and continuing to wind the spring 7 for half a circle after shaping, so that the joint 8 of the spring 7 and the steel wire 6 wound for half a circle is positioned above;
as shown in fig. 2, two pressing forces with opposite directions and in the same straight line are applied to the joint 8 of the steel wire 6 and the spring 7, the steel wire 6 with a bending half circle is positioned, and a gap is reserved between the application position of the pressing force and the position of the spring 7 connected with the steel wire 6;
as shown in fig. 3, a torsion force is applied to the first coil of the spring 7 connected to the steel wire 6 and is far away from the steel wire 6, and the applied force is far away from the joint 8 of the first coil and the steel wire 6, so that the spring 7 turns along the axis of the joint 8 towards the direction of the applied force of the torsion force, and the joint 8 of the steel wire 6 and the spring 7 is twisted off and separated;
the torsion-broken portion of the spring 7 after separation from the wire 6 is subjected to surface treatment, and the residue formed by the torsion-broken portion is subjected to shot peening.
Embodiment 1, a spring processing apparatus, as shown in fig. 4, comprises a support member 1 for supporting a wire 6 wound a half turn, a pressing member 2 for pressing the wire 6, and a bending mechanism 3 for pushing the spring 7 to flip upward. The support piece 1 is fixedly arranged on the spring coiling machine, one end of the support piece, which is far away from the spring coiling machine, is inserted into the steel wire 6 of the winding half circle, the upper end of the support piece 1 can be abutted with the top wall of the inner cavity of the steel wire 6 of the winding half circle, and a gap is reserved between the projection of the support piece 1 on the horizontal plane and the projection of the spring 7 on the horizontal plane. The compressing element 2 vertically slides on the spring coiling machine, the compressing element 2 is further provided with a compressing driving element 21 for driving the compressing element 2 to vertically move, the compressing driving element 21 is a hydraulic cylinder, the compressing driving element 21 is fixed on the spring coiling machine, the driving end of the compressing driving element 21 is fixed with the upper end of the compressing element 2, and the position of the steel wire 6 which is coiled for half circle and is close to the spring 7 is fixed by utilizing the cooperation of the supporting element 1 and the compressing element 2.
As shown in fig. 4, the bending mechanism 3 includes a jacking block 31 vertically sliding on the spring coiling machine and a jacking driving member 32 pushing the jacking block 31 to vertically move, the jacking block 31 is disposed below the spring 7, and the upper end of the jacking block 31 away from the side wall of the steel wire 6 is obliquely disposed and can be abutted against the spring 7. The jacking driving piece 32 is a hydraulic cylinder, the jacking driving piece 32 is fixed on the spring coiling machine, and the driving end of the jacking driving piece 32 is fixed with the jacking block 31. In this case, when the spring 7 is separated from the wire 6, the cutting by the cutter is no longer necessary, and the spring 7 is not easily affected by the cutter to generate a notch. And the spring 7 can not generate a bulge towards the spring coil of the spring 7 in the torsion cutting process, so that a notch is not easy to generate in the using process of the spring 7.
The implementation principle of the embodiment is as follows: after the spring 7 is formed, the steel wire 6 continues to be wound for half a turn, so that the joint 8 between the steel wire 6 and the spring 7 is positioned at the upper end of the supporting piece 1 and is abutted against the upper end of the supporting piece 1, the pressing piece 2 descends to press the steel wire 6 on the supporting piece 1, and the jacking block 31 pushes the spring 7 to rotate upwards, so that the joint 8 between the spring 7 and the steel wire 6 is twisted, and the spring 7 is separated from the steel wire 6.
The embodiment 2 is different from the embodiment 1 in that the bending mechanism 3 includes a clamp 33 capable of clamping one end of the spring 7 near the wire 6, a guide 4 for guiding rotation of the clamp 33, and a bending driver 41 for driving rotation of the guide 4, as shown in fig. 5. The clamping piece 33 comprises a first clamping rod 331 and a second clamping rod 332, the first clamping rod 331 and the second clamping rod 332 are slidably arranged on the guide piece 4, the guide piece 4 is rotationally connected with the spring coiling machine, and the rotation axis of the guide piece 4 is overlapped with the torsion axis of the steel wire 6 and the spring 7. The bending driving piece 41 is a hydraulic cylinder, the bending driving piece 41 is rotatably arranged on the spring coiling machine, and the driving end of the bending driving piece 41 is rotatably connected with the guide piece 4. The guide 4 is further provided with a clamping driving member 34 for driving the first clamping rod 331 and the second clamping rod 332 to approach or separate from each other, the clamping driving member 34 is a bidirectional hydraulic cylinder, and two driving ends of the clamping driving member 34 are respectively connected with the first clamping rod 331 and the second clamping rod 332. The first clamping rod 331 is disposed below the second clamping rod 332, the first clamping rod 331 can be inserted into the spring 7 from one end of the spring 7 far away from the steel wire 6 and is abutted against the inner top of the spring 7 close to the connection position of the spring 7 and the steel wire 6, the second clamping rod 332 is disposed above the spring 7, and the second clamping rod 332 can be abutted against the upper end of the outer wall of the spring 7 close to the connection position of the steel wire 6. The side walls of the first clamping lever 331 and the second clamping lever 332, which are in contact with the spring 7, are provided with accommodating grooves 333, and the accommodating grooves 333 can be attached to the spring 7. When the spring 7 needs to be driven to twist, the spring 7 is clamped and applied by the first clamping rod 331 and the second clamping rod 332, so that the twisting-off position of the spring 7 and the steel wire 6 is located at the connecting position 8 of the steel wire 6 and the spring 7, the whole spring 7 is not easy to deform in the process of twisting-off the spring 7, and the whole quality of the processed spring 7 is not easy to influence.
In embodiment 3, as shown in fig. 6, the difference from embodiment 2 is that the first clamping rod 331 and the second clamping rod 332 are both disposed at one end of the spring 7 close to the steel wire 6, the first clamping rod 331 is inserted into the steel wire 6 from one end of the spring 7 close to the steel wire 6 and is abutted with the top wall of the inner cavity of the spring 7 close to the connection point 8, and the second clamping rod 332 is abutted with the upper end of the outer wall of the spring 7 close to the connection point 8. The guide piece 4 is also provided with a sliding piece 5 for driving the clamping piece 33 to horizontally move and a sliding driving piece 51 for driving the sliding piece 5 to move, the sliding driving piece 51 is a hydraulic cylinder, the sliding driving piece 51 is fixed on the guide piece 4, the driving end of the sliding driving piece 51 is fixedly connected with the sliding piece 51, and the clamping piece 33 is arranged on the sliding piece 5. After the winding of the spring 7 is completed, the sliding member 5 drives the first clamping rod 331 and the second clamping rod 332 to move towards the end of the spring 7, which is close to the steel wire 6, so that the first clamping rod 331 and the second clamping rod 332 are close to the spring 7 and clamp the end of the spring 7, then the guiding member 4 rotates and twists off the connecting part 8 of the spring 7 and the steel wire 6 and separates the two, and after separation, the first clamping rod 331 and the second clamping rod 332 rotate to be horizontal and away from each other, so that the spring 7 separated from the steel wire 6 falls.
The embodiments of the present invention are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (3)
1. A spring processing apparatus, characterized in that: the spring pressing device comprises a supporting piece (1) for supporting a steel wire (6) connected to a spring (7), a pressing piece (2) for pressing the steel wire (6) and a bending mechanism (3) for pushing the spring (7) to turn, wherein the supporting piece (1) can be fixed on a spring coiling machine, the pressing piece (2) and the bending mechanism (3) can be slidably arranged on the spring coiling machine, the upper end of the supporting piece (1) can be abutted to the side wall of the lower end of the steel wire (6) close to a connecting part (8) of the spring (7), and the lower end of the pressing piece (2) can be abutted to the side wall of the upper end of the steel wire (6) close to the connecting part (8) of the spring (7); the bending mechanism (3) comprises a clamping piece (33) capable of clamping one end, close to the steel wire (6), of a spring (7), a guide piece (4) for guiding the rotation of the clamping piece (33) and a bending driving piece (41) for driving the guide piece (4) to rotate, the clamping piece (33) is arranged on the guide piece (4), the clamping piece (33) can be simultaneously abutted to two sides of the steel wire (6) at the end part of the spring (7), the guide piece (4) is connected to a spring coiling machine, the rotation axis of the guide piece (4) is superposed on the axis of the torsion part of the spring (7) and the steel wire (6), the bending driving piece (41) is arranged on the spring coiling machine, and the driving end of the bending driving piece (41) is connected with the guide piece (4); the clamping piece (33) comprises a first clamping rod (331), a second clamping rod (332) and a clamping driving piece (34) for driving the first clamping rod and the second clamping rod to be close to or far away from each other, the first clamping rod (331) and the second clamping rod (332) are both arranged on the guide piece (4) in a sliding mode, the first clamping rod (331) and the second clamping rod (332) can be respectively abutted to two sides, away from each other, of a steel wire (6) of the spring (7), and the first clamping rod (331) and the second clamping rod (332) are both close to the supporting piece (1) and the pressing piece (2); the first clamping rod (331) and the second clamping rod (332) are connected to the end part of the clamping driving piece (34) away from the position where the spring (7) is twisted off, and the first clamping rod (331) penetrates through the spiral opening of the spring (7) away from the twisted off position.
2. A spring processing apparatus according to claim 1, wherein: the first clamping rod (331) and the second clamping rod (332) are clamped on the side wall of the spring (7), the side wall of the spring is provided with a containing groove (333), and the containing groove (333) can be attached to the spring (7).
3. A spring processing apparatus according to claim 2, wherein: the guide piece (4) is provided with a sliding piece (5) and a sliding driving piece (51) for driving the sliding piece (5) to move, the driving end of the sliding driving piece (51) is connected with the sliding piece (5), and the clamping piece (33) is arranged on the sliding piece (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210249952.1A CN114589276B (en) | 2022-03-14 | 2022-03-14 | Spring processing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210249952.1A CN114589276B (en) | 2022-03-14 | 2022-03-14 | Spring processing equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114589276A CN114589276A (en) | 2022-06-07 |
| CN114589276B true CN114589276B (en) | 2023-08-01 |
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ID=81809103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210249952.1A Active CN114589276B (en) | 2022-03-14 | 2022-03-14 | Spring processing equipment |
Country Status (1)
| Country | Link |
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| CN (1) | CN114589276B (en) |
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| CN106040920A (en) * | 2016-08-22 | 2016-10-26 | 陶胜治 | Stress breaking process of automatic spring coiler for spring wires |
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| DE2535819C2 (en) * | 1975-08-12 | 1976-10-28 | Hack Karl Maschf | METHOD AND DEVICE FOR SEPARATING A PIECE OF PRE-DETERMINED LENGTH FROM A CONTINUOUS STRAND OF COIL SPRING |
| JP3324078B2 (en) * | 1996-12-19 | 2002-09-17 | 旭精機工業株式会社 | Cutting method of coil spring |
| JP4011603B1 (en) * | 2006-05-30 | 2007-11-21 | 三菱製鋼株式会社 | Coil spring end forming apparatus and coil spring end forming method |
| CN205904708U (en) * | 2016-07-29 | 2017-01-25 | 浙江东旺不锈钢实业有限公司 | Pipe clamping device of lathe processing usefulness |
| CN107598034A (en) * | 2017-09-25 | 2018-01-19 | 杭州富春弹簧有限公司 | The combination shearing device and its method of a kind of spring flat nick |
| CN208083275U (en) * | 2018-03-05 | 2018-11-13 | 杭州弹簧有限公司 | A kind of spring coiling mechanism |
| JP7258545B2 (en) * | 2018-12-28 | 2023-04-17 | 日本発條株式会社 | Coiling machine and manufacturing method of coil spring |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5285669A (en) * | 1993-01-27 | 1994-02-15 | Kabushiki Kaisha Itaya Seisaku Sho | Spring manufacturing apparatus and spring cutting mechanism |
| EP1533053A1 (en) * | 2003-11-22 | 2005-05-25 | Bernt Dr. Schroer | Method for manufacturing a curved helical spring and device for carrying out this method |
| JP2009106988A (en) * | 2007-10-31 | 2009-05-21 | Asahi-Seiki Mfg Co Ltd | Coil spring producing machine and coil spring production method |
| WO2015007496A1 (en) * | 2013-07-18 | 2015-01-22 | Wafios Ag | Method and device for producing coil springs by spring winding |
| KR101584040B1 (en) * | 2015-08-31 | 2016-01-12 | 이동은 | Bending and cutting device of coil spring |
| CN106040920A (en) * | 2016-08-22 | 2016-10-26 | 陶胜治 | Stress breaking process of automatic spring coiler for spring wires |
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| Publication number | Publication date |
|---|---|
| CN114589276A (en) | 2022-06-07 |
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