CN114423963B - Method for manufacturing coil spring and suspension device for saddle-type vehicle - Google Patents
Method for manufacturing coil spring and suspension device for saddle-type vehicle Download PDFInfo
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- CN114423963B CN114423963B CN202080065076.6A CN202080065076A CN114423963B CN 114423963 B CN114423963 B CN 114423963B CN 202080065076 A CN202080065076 A CN 202080065076A CN 114423963 B CN114423963 B CN 114423963B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000725 suspension Substances 0.000 title claims description 20
- 230000006835 compression Effects 0.000 claims abstract description 32
- 238000007906 compression Methods 0.000 claims abstract description 32
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- 238000005422 blasting Methods 0.000 claims description 40
- 238000004804 winding Methods 0.000 claims description 39
- 230000002093 peripheral effect Effects 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 14
- 238000005482 strain hardening Methods 0.000 claims description 8
- 238000005480 shot peening Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000005119 centrifugation Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Abstract
Provided is a method for manufacturing a coil spring, including: a preparation step of preparing the coil spring, wherein a free length of the coil spring is L1, and a value D/D of the coil spring obtained by dividing a coil center diameter D by a wire diameter D is 5.5 or more and 10 or less; a compression step of compressing a coil spring in a range of a compression ratio of 0.45 or more and 0.7 or less, the compression ratio being defined by (L1-L2)/L1 when the coil spring is compressed by a length L2; and a stress peening step of peening at least an inner periphery of the coil spring while maintaining a compressed state of the coil spring.
Description
Technical Field
The present invention relates to a technique of manufacturing a coil spring and a suspension device for a saddle-type vehicle using the coil spring.
Background
Saddle-type vehicles such as two-wheeled vehicles are equipped with suspension devices for saddle-type vehicles, such as front forks and rear bumpers. In such a suspension device for a saddle-type vehicle, a coil spring that urges a piston toward a predetermined position is arranged. One technique is disclosed in the reference 1 as a prior art related to such a coil spring.
Patent document 1 paragraph 0045 discloses "shot peening is preferably performed to apply compressive residual stress to the surface layer of the coil spring" and "this significantly improves fatigue resistance".
List of references
Patent literature
Patent document 1: JP-A-2000-326036
Disclosure of Invention
Technical problem
The coil spring is a member that is repeatedly loaded in the compression direction, and it is required to have higher strength from the viewpoint of extending the life of the coil spring.
An object of the present invention is to provide a technique for manufacturing a coil spring having higher strength.
Solution to the problem
As a result of intensive studies, the present inventors have found that, for a saddle-ride type vehicle on which an occupant rides, such as a two-wheeled vehicle or a three-wheeled vehicle, in order to improve the fatigue strength of a coil spring for a suspension device, it is important to improve the fatigue strength on the inner peripheral side of the coil spring. Further, when a so-called closed coil spring or a so-called open coil spring in which the winding angle of at least the axial end portion of the coil spring is changed is manufactured by stress shot peening, the present inventors found that a portion in which the winding angle is changed is less likely to collide with the ejection material than other portions. For example, from the standpoint of manufacturing a coil spring having improved fatigue strength for a suspension device for a saddle-type vehicle, it is preferable that the injection material collide with a portion where the winding angle is changed or the inner peripheral surface of the coil spring. The inventors have also studied the conditions of stress peening that enable the peened material to collide with these portions as well. As a result, it was found that by applying stress peening in a state where a coil spring having a value of a spring index D/D obtained by dividing a coil center diameter D by a wire diameter D of 5.5 or more and 10 or less is compressed in a range of a compression ratio of 0.45 or more and 0.7 or less, a shot material can collide with a portion where an inner peripheral surface and a winding angle of the coil spring are changed, and as a result, a coil spring having high strength can be obtained. The present invention has been completed based on this finding.
The present invention will be described hereinafter.
According to an aspect of the present invention, there is provided a method of manufacturing a coil spring, including: the preparation steps are as follows: preparing the coil spring, wherein the free length of the coil spring is L1, and the value of D/D of the coil spring obtained by dividing the coil center diameter (D) by the wire diameter (D) is 5.5 or more and 10 or less; and (3) compressing: compressing the coil spring in a range of a compression ratio of 0.45 or more and 0.7 or less, the compression ratio being defined by (L1-L2)/L1 when the coil spring is compressed by a length L2; stress shot blasting: at least the inner peripheral surface of the coil spring is shot-blasted while maintaining the compressed state of the coil spring.
In the coil spring, the winding portion at the end portion may be in contact with or close to the adjacent winding portion by changing the winding angle of the portion including the end portion.
The stress peening step is preferably performed by cold working.
The compression step may be preceded by a shot blasting step: shot blasting is performed on the coil spring under the free length.
According to another aspect of the present invention, there is provided a method of manufacturing a coil spring, comprising: the preparation steps are as follows: preparing the coil spring, wherein a free length of the coil spring is L1, a value obtained by dividing a coil center diameter (D) by a wire diameter (D) of the coil spring is 5.5 or more and 10 or less, and a winding portion at an end portion of the coil spring contacts or is close to an adjacent winding portion of the coil spring by changing a winding angle of a portion including the end portion of the coil spring; shot blasting: shot blasting the coil spring at the free length; and (3) compressing: compressing the coil spring in a range of a compression ratio of 0.45 or more and 0.7 or less, the compression ratio being defined by (L1-L2)/L1 when the coil spring, on which the peening step has been performed, is compressed by a length L2; stress shot blasting: at least the inner peripheral surface of the coil spring is shot-blasted in a cold condition while maintaining the compressed state of the coil spring.
According to still another aspect of the present invention, there is provided a suspension device for a saddle-type vehicle, wherein a coil spring manufactured by the manufacturing method of the coil spring is used.
Advantageous effects of the invention
According to the present invention, a method of manufacturing a coil spring having high strength can be provided.
Drawings
Fig. 1 is a sectional view of a main portion of a front fork according to a first example.
Fig. 2 is a flowchart illustrating a method for manufacturing the coil spring shown in fig. 1.
Fig. 3A is a diagram for illustrating a preparation step.
Fig. 3B is an enlarged sectional view of a portion of the coil spring shown in fig. 3A.
Fig. 4A is a diagram for illustrating the shot blasting step.
Fig. 4B is a diagram for illustrating the compression step.
Fig. 5 is a diagram for illustrating a stress peening step.
Fig. 6 is a diagram showing a relationship between each step and the free length of the coil spring in the manufacturing method according to the comparative example.
Fig. 7 is a flowchart showing a method of manufacturing a coil spring according to a second example.
Fig. 8 is a flowchart showing a method of manufacturing a coil spring according to a third example.
List of reference marks
10 Front fork (suspension device for riding type vehicle)
20 Coil spring
30 Coil spring
31 Winding portions at both ends
32 Adjacent winding portions
41 First shot
42 Second shot
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings. The embodiments shown in the drawings are examples of the present invention, and the present invention is not limited to these embodiments.
< First example >
See fig. 1. Fig. 1 shows a front fork 10 (a suspension device 10 for a saddle-type vehicle). For example, two front forks 10 are provided at the front of a two-wheeled vehicle, and the front wheels are rotatably supported so as to be sandwiched from side to side by the front forks 10.
The coil spring 20 is disposed inside the front fork 10. The coil spring 20 is a member that urges the piston displaced in the compression direction to return to the original position of the piston. The coil spring 20 for the front fork 10 is characterized by a smaller coil center diameter relative to the free length, compared to a general coil spring. A method of manufacturing the coil spring 20 will be described later.
See fig. 2, 3A and 3B. First, a coil spring 30 having a free length L1 and a D/D value obtained by dividing the coil center diameter D by the wire diameter D of 5.5 or more and 10 or less is prepared (preparation step).
In the present invention, from the viewpoint of making the ejection material liable to collide with the inner peripheral surface of the coil spring, it is preferable that the D/D value is set to 5.5 or more and the D/D value is set to 6 or more. Even when stress peening described later is performed, the D/D value is set to 10 or less from the viewpoint of easiness in suppressing buckling (body bending) of the manufactured coil spring. That is, in the present invention, while making it easy for the shot material to collide with the inner surface of the coil spring, it is easy to suppress buckling (body bending) of the manufactured coil spring even when stress peening is applied, and D/D is set to 5.5 or more and 10 or less from the above point of view. The D/D is preferably 6 to 10 inclusive.
In particular, see fig. 3A. The coil spring 30 to be prepared is used for a front fork, for example, and only the winding angles of the winding portions 31 and 31 at both ends are changed so that the winding portions 31 and 31 at both ends are in contact with the adjacent winding portions 32 and 32, respectively. That is, the coil spring 30 is a so-called hermetic compression coil spring.
The coil spring 30 has, for example, a free length L1 of 200mm to 480mm, a coil center diameter D of 15mm to 50mm, and a wire diameter D of 3.0mm to 8.0 mm.
The coil spring 30 is not limited to the closed coil spring shown in fig. 3A and the like. The coil spring prepared in the preparing step may be an open coil spring, the winding portions at both end portions of which are brought close to each other with respect to adjacent winding portions of the winding portion due to a winding angle of a portion including the end portions being changed. Here, in the present invention, "the winding portion at the end portion is close to the adjacent winding portion" means that the gap between the winding portion at the end portion and the adjacent winding portion of the winding portion at the end portion is set to 3mm or less. The coil spring 30 may have any configuration.
See fig. 2 and 4A. Next, the coil spring 30 of the free length L1 (see fig. 3A) is shot-blasted (shot-blasting step). More specifically, the surface of the coil spring 30 is caused to collide with the first shot 41 made of metal or a material having the same hardness as the metal. The shot blasting step is performed in a room temperature environment. That is, the shot blasting step is performed by cold working. In this case, it is preferable to spray the first shot 41 on the portion of the coil spring 30 including the inner peripheral surface.
For example, as the method of ejecting the first shot 41, a centrifugal method of rotating the spin slurry 51 at a high speed to eject the first shot 41 may be employed.
The ejection conditions of the first shot 41 such as the material, shape, average particle size, and ejection speed can be freely selected. In addition, as the injection method, an injection method may be employed in addition to the centrifugation method.
See fig. 2 and 4B. Next, the coil spring 30 is compressed by a length L2 (compression step). See also fig. 3A. Here, the compressed length L2 of the coil spring 30 is set so that the compression ratio defined by (L1-L2)/L1 is in the range of 0.45 or more and 0.7 or less. The reason for the compression to this range will be described later.
See fig. 2 and 5. Next, the coil spring 30 is shot-blasted while maintaining the compressed state of the coil spring 30 (stress shot-blasting step). More specifically, the surface of the coil spring 30 is caused to collide with the second shot 42 made of metal or a material having the same hardness as the metal. It is preferable to perform the stress peening step in a temperature environment without special temperature control. That is, it is preferable to perform the stress peening step by cold working. In this case, it is preferable to jet the second shot 42 so that it collides with the inner peripheral surface of the coil spring 30.
For example, the average particle size of the second shot 42 is equal to or smaller than the average particle size of the first shot 41. As the spraying method, a centrifugal method of rotating the spin slurry 51 at a high speed to spray the second shot 42 may be employed.
The ejection conditions of the second shot 42, such as the material, shape, average particle size, and ejection speed, may be arbitrarily selected. In addition, as the injection method, an injection method may be employed in addition to the centrifugation method. This includes using the same shots in the peening step and the stress peening step, and employing the same peening conditions. As the ejection method of the second shot 42, an ejection method different from that of the first shot 41 may also be employed.
The time for ejecting the second shot 42 (time for the stress peening step) is not particularly limited, but is preferably shorter than the time for ejecting the first shot 41 (time for the peening step).
Next, experiments performed by the present inventors will be described. In the method of manufacturing a coil spring according to the comparative example, the shot blasting is further performed after the stress shot blasting step. This is called an additional shot peening step. For the steps other than the additional shot blasting step, the coil spring was manufactured under the same conditions as the manufacturing method according to the example.
The inventors measured the free length of the coil spring at the preparation step, the free length of the coil spring after the peening step, the free length of the coil spring after the stress peening step, and the free length of the coil spring after the additional peening step. The results are shown in fig. 6.
In addition, the residual stress of the coil spring after the peening step, the residual stress of the coil spring after the stress peening step, and the residual stress of the coil spring after the additional peening step were measured.
The free length L1 of the coil spring at the preparation step is longest with respect to the free length of the coil spring. After the preparation step, the free length of the coil spring becomes gradually shorter as a result of the shot blasting step and the stress shot blasting step being performed. The free length L3 of the coil spring after the stress peening step is shortest.
By performing the additional peening step, the free length of the coil spring is longer than the free length after the stress peening step and shorter than the free length after the peening step.
As the peening step and the stress peening step are performed, the compressive residual stress applied to the coil spring gradually increases. By performing the additional peening step, the compressive residual stress is smaller than the compressive residual stress after the stress peening step and is larger than the compressive residual stress after the peening step.
In the prior art, it is known to apply residual stress to coil springs by shot peening or stress peening the coil springs. In this experiment, it was found that the free length becomes shorter as the residual stress applied to the coil spring increases. It has also been found that the free length becomes longer as the residual stress applied to the coil spring decreases.
From the above results, the present inventors have found that whether or not a predetermined compressive residual stress is applied can be confirmed by measuring the free length of the coil spring 20. That is, in the present invention, when the free length after the stress peening according to the above-described embodiment is L3, it is preferable to manufacture the coil spring under the condition that the free length is maintained at L3 or less after the stress peening step.
The above description is summarized as follows.
See fig. 2 to 5. The method of manufacturing the coil spring 20 includes: a preparation step (fig. 3A and 3B) of preparing a coil spring 30, the coil spring 30 having a free length L1 and a D/D value obtained by dividing a coil center diameter D by a wire diameter D of 5.5 or more and 10 or less; a compression step (fig. 4B) of compressing the coil spring 30 in a range where a compression ratio defined by (L1-L2)/L1 is 0.45 or more and 0.7 or less when the coil spring 30 is compressed by a length L2; and a stress peening step (fig. 5) of peening at least the inner peripheral surface of the coil spring 30 while maintaining the compressed state of the coil spring 30.
That is, on the premise that the coil spring 30 has a D/D value of 5.5 to 10, at least the inner peripheral surface of the compression spring 30 in a compressed state with a compression ratio of 0.45 to 0.7 is shot-blasted.
The present inventors have found that a manufacturing technique of a coil spring having a higher strength can be provided by stress peening a portion including an inner peripheral surface of the coil spring 30. Here, D/D is set to 5.5 or more from the viewpoint of facilitating the manufacture of a coil spring having an increased strength of the inner peripheral surface. Further, D/D is set to 10 or less from the viewpoint of facilitating the manufacture of a high-strength coil spring that suppresses bending of the body. From these viewpoints, in the present invention, D/D is set to 5.5 or more and 10 or less, and preferably D/D is set to 6 or more and 10 or less. In addition, from the viewpoint of facilitating the manufacture of the high-strength coil spring, the compression ratio is set to 0.7 or less. The compression ratio is set to 0.45 or more in view of improving the fatigue strength of the inner peripheral surface of the coil spring 20 by making the second projectile 42 easily collide with the inner peripheral surface of the coil spring 30. From these points of view, in the present invention, the compression ratio is set to 0.45 or more and 0.7 or less. By compressing the coil spring in a range of a compression ratio of 0.45 or more and 0.7 or less, sufficient residual stress can be applied, and a technique of manufacturing a high-strength coil spring can be provided in particular.
See fig. 3A. In the coil spring 30, the winding angle of the portion including the winding portions 31 and 31 at the end portion is changed so that the winding portions 31 and 31 at the end portion are in contact with the adjacent winding portions 32 and 32. In such a coil spring 30, it tends to be difficult to spray the second pellets 42 particularly toward the inner peripheral surfaces of both ends (see fig. 5). On the other hand, in the present invention, the coil spring 30 is compressed in a range of a compression ratio of 0.45 or more and 0.7 or less, and the compressed coil spring 30 is stress-peened, in such a manner that even if gaps between the winding portions 31 and 31 at both ends and the adjacent winding portions 32 and 32 are small, the coil spring having enhanced fatigue strength in a portion including the inner peripheral surface can be provided. Similar effects can be obtained even when coil springs such that the winding portions 31 and 31 at the end portions are close to the adjacent winding portions 32 and 32 are used.
See fig. 5. The stress peening step is not limited to a form performed by cold working, but is preferably performed by cold working. By performing cold working, the coil spring 30 does not need to be heated, so that processing can be performed with a simple apparatus, and the coil spring 20 can be manufactured at low cost.
See fig. 4A. Before the compression step, a peening step of peening the coil spring 30 of a free length is included. By performing the shot-peening before the stress shot-peening, a larger residual stress can be applied to the coil spring 20 (see fig. 5B).
See fig. 1. The coil spring 20 is used for a front fork 10 (a suspension device 10 for a saddle-type vehicle). The front fork is a cylindrical member having a diameter smaller than the length in the up-down direction. The coil spring 20 for the front fork is a high-strength spring in which residual stress is particularly applied to the inner peripheral surface. The coil spring 20 manufactured through the above steps can also increase the residual stress of the inner peripheral surface. Since the coil spring 20 for the front fork is required to have a high residual stress on the inner peripheral surface, the coil spring 20 that can be used for the front fork can be manufactured through the above steps.
< Second example >
A second example will be described next with reference to the drawings. Fig. 7 shows a method of manufacturing a coil spring according to a second example. In the method of manufacturing a coil spring according to the second example, the peening step is composed of a first peening step and a second peening step. The other steps are the same as in the method of manufacturing the coil spring according to the first embodiment. A detailed description of the common portions with the first example will be omitted.
The conditions of the shot blasting between the first shot blasting step and the second shot blasting step are different. That is, the peening step in the second example is performed twice while changing peening conditions.
For example, in the second shot blasting step, shot blasting time is shorter than that in the first shot blasting step. And/or in the second shot blasting step, shots are blasted at a lower speed than in the first shot blasting step.
The peening step may be performed three or more times by appropriately changing the conditions.
The predetermined effect of the present invention can be obtained even when the coil spring is manufactured by the above-described manufacturing method of the coil spring.
In addition, in the second example, the peening step is performed twice or more while changing the peening conditions. As a result, the coil spring 20 (see fig. 1) of high strength can be obtained.
In particular, in the second shot-blasting step, it is preferable that shot-blasting time is shortened or shot-blasting speed is reduced as compared with the first shot-blasting step. It is more preferable that the second shot-blasting step has a shorter shot-blasting time and a lower blasting speed than those in the first shot-blasting step. In such an embodiment, it is easy to manufacture a coil spring of high strength.
< Third example >
A third example will be described next with reference to the drawings. Fig. 8 shows a method of manufacturing a coil spring according to a third example. A detailed description of the common portions with the first example will be omitted.
The method of manufacturing a coil spring according to the third example includes a preparation step, a compression step, and a stress peening step, and has no peening step between the preparation step and the compression step.
The predetermined effect of the present invention can be obtained even when the coil spring is manufactured by the manufacturing method of the coil spring according to the third example.
By reducing the number of steps for obtaining the coil spring, the coil spring can be manufactured at a lower cost.
Although the coil spring 20 has been described as an example for the front fork 10 of a two-wheeled vehicle, the coil spring 20 may also be used for all saddle-type vehicles other than two-wheeled vehicles, such as a three-wheeled vehicle and a four-wheeled vehicle on which an occupant rides.
The coil spring 20 can be used not only for a front fork of a saddle-type vehicle but also for a rear cushion. That is, the coil spring 20 can be used for all suspension devices of the saddle-type vehicle.
The present invention is not limited to the examples as long as the operations and effects of the present invention are exhibited.
INDUSTRIAL APPLICABILITY
The coil spring manufactured by the manufacturing method of the present invention can be applied to a front fork of a two-wheeled vehicle.
Claims (8)
1. A method of manufacturing a coil spring for a suspension device of a saddle-type vehicle, comprising:
The preparation steps are as follows: preparing the coil spring, wherein the free length of the coil spring is L1, and the value of D/D obtained by dividing the coil center diameter D by the wire diameter D of the coil spring is more than 5.5 and less than 10;
and (3) compressing: compressing the coil spring within a range of a compression ratio of 0.45 or more and 0.7 or less, wherein the compression ratio is defined by (L1-L2)/L1 when the coil spring is compressed by a length L2; and
Stress shot blasting: at least the inner peripheral surface of the coil spring is shot-blasted by ejecting an ejection material from the outside of the outer peripheral surface of the coil spring toward the coil spring from one direction while maintaining the compressed state of the coil spring.
2. The method for manufacturing a coil spring for a suspension device of a saddle-type vehicle according to claim 1, wherein,
In the coil spring, by changing a winding angle of a portion including an end portion, a winding portion at the end portion is brought into contact with or close to an adjacent winding portion.
3. The method for manufacturing a coil spring for a suspension device of a saddle-type vehicle according to claim 1, wherein,
The stress peening step is performed by cold working.
4. The method for manufacturing a coil spring for a suspension device of a saddle-type vehicle according to claim 2, wherein,
The stress peening step is performed by cold working.
5. The manufacturing method of a coil spring for a suspension device of a saddle-type vehicle according to any one of claims 1to 4, further comprising, before the compressing step:
Shot blasting: shot blasting is performed on the coil spring under the free length.
6. The method for manufacturing a coil spring for a suspension device of a saddle-type vehicle according to any one of claims 1 to 4, wherein,
The stress shot blasting step is as follows: at least the inner peripheral surface of the coil spring is shot-blasted by ejecting the ejection material toward the coil spring from a centrifugal device located outside the outer peripheral surface of the coil spring.
7. The method for manufacturing a coil spring for a suspension device of a saddle-type vehicle according to claim 5, wherein,
The stress shot blasting step is as follows: at least the inner peripheral surface of the coil spring is shot-blasted by ejecting the ejection material toward the coil spring from a centrifugal device located outside the outer peripheral surface of the coil spring.
8. A method of manufacturing a coil spring for a suspension device of a saddle-type vehicle, comprising:
The preparation steps are as follows: preparing the coil spring, wherein a free length of the coil spring is L1, and a value obtained by dividing a coil center diameter D of the coil spring by a wire diameter D is 5.5 or more and 10 or less, by changing a winding angle of a portion including an end portion of the coil spring, a winding portion at the end portion of the coil spring is brought into contact with or close to an adjacent winding portion of the coil spring;
shot blasting: shot blasting the coil spring at the free length;
And (3) compressing: compressing the coil spring within a range of a compression ratio of 0.45 or more and 0.7 or less, wherein the compression ratio is defined by (L1-L2)/L1 when the coil spring, on which the peening step has been performed, is compressed by a length L2; and
Stress shot blasting: at least the inner peripheral surface of the coil spring is shot-blasted in a cold condition by ejecting a blast material from a centrifugal device located outside the outer peripheral surface of the coil spring toward the coil spring from one direction while maintaining the compressed state of the coil spring.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2020/012930 WO2021192009A1 (en) | 2020-03-24 | 2020-03-24 | Method for producing coil spring and suspension device for saddle-ride type vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114423963A CN114423963A (en) | 2022-04-29 |
| CN114423963B true CN114423963B (en) | 2024-07-02 |
Family
ID=
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0531671A (en) * | 1991-07-22 | 1993-02-09 | Chuo Spring Co Ltd | Peening processing method for coil spring |
| JPH05148537A (en) * | 1991-07-11 | 1993-06-15 | Tougou Seisakusho:Kk | Production of coil spring |
| CN1354802A (en) * | 1999-06-08 | 2002-06-19 | 日本发条株式会社 | High-strength spring and production method therefor |
| JP2003148531A (en) * | 2001-11-09 | 2003-05-21 | Showa Corp | Multi-stage coil spring |
| CN107000162A (en) * | 2014-08-20 | 2017-08-01 | 日本发条株式会社 | Impeller lifting type shot-peening apparatus and coil spring |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05148537A (en) * | 1991-07-11 | 1993-06-15 | Tougou Seisakusho:Kk | Production of coil spring |
| JPH0531671A (en) * | 1991-07-22 | 1993-02-09 | Chuo Spring Co Ltd | Peening processing method for coil spring |
| CN1354802A (en) * | 1999-06-08 | 2002-06-19 | 日本发条株式会社 | High-strength spring and production method therefor |
| JP2003148531A (en) * | 2001-11-09 | 2003-05-21 | Showa Corp | Multi-stage coil spring |
| CN107000162A (en) * | 2014-08-20 | 2017-08-01 | 日本发条株式会社 | Impeller lifting type shot-peening apparatus and coil spring |
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