JPH0724731A - Shot peening for coil spring - Google Patents

Abstract

PURPOSE:To give uniform shot peening to the whole outer surface of a coil spring by ensuring accurate rotation and straight feed of the coil spring. CONSTITUTION:A projection part 3 to project steel particles, a long roller 5 located in front thereof in the projection direction to rotate a coil spring S and a belt conveyor 6 provided in parallel to the roller 5 along the longitudinal direction to forcibly carry the spring S in the longitudinal direction of the roller 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to shot peening for a coil spring for projecting small steel particles onto the coil spring for shot peening.

[0002]

2. Description of the Related Art Shot peening processing means has been conventionally known as a means for strengthening the strength of a coil spring. This processing means projects small steel particles on the outer surface of the coil spring to produce the coil. By removing small scratches formed on the outer surface of the spring, and at the same time providing minute irregularities on the outer surface, work hardening occurs and residual stress is generated. Is to strengthen.

In the shot peening for the coil, which is subjected to the above shot peening, however, as shown in FIGS. 5 and 6, a projection portion A for projecting small steel particles on the coil spring S, The coil spring S is provided with a feeding portion B configured to project small steel particles uniformly on the entire outer surface of the coil spring S by passing the lower portion of the projection portion A while rotating the coil spring S. Further, the feeding section B is disposed on the lower side of the projecting section A and is substantially horizontally supported by a metal-made long first roller C, and is arranged in proximity to the side portion of the first roller C. In addition, the second roller D is made of metal and is supported in an inclined shape with respect to the first roller C.

Then, the first and second rollers C and D are
By placing the coil spring S on each of the rollers C and D while rotationally driving as shown by the arrow in FIG. 6, the first roller C applies a rotational force in the arrow direction to the coil spring S. In addition, the inclination of the second roller D gives the coil spring S an axial movement action due to the weight of the spring S, that is, while the coil spring S is rotated by the first roller C, The coil spring S is moved to the lower side of the projection part A along the inclination of the second roller D, and the small steel particles from the projection part A are projected onto the coil spring S, thereby Shot peening is applied to the entire outer surface of S.

[0005]

However, as described above, the first roller C supported substantially horizontally and the second roller D supported obliquely with respect to the first roller C are used. When the coil spring S is moved in the axial direction by utilizing the own weight of the coil spring S while being rotated, that is, when the coil spring S is fed in a straight line, the coil spring S is changed by the contact resistance of the coil spring S and the like. An error easily occurs in the moving speed of the spring S in the axial direction, and when this error occurs, the small steel particles from the projection unit A are uniformly projected onto the entire outer surface of the coil spring S. However, the projection amount of the small steel particles received by the coil spring S varies depending on the length direction, so that the coil spring S has a problem that a predetermined strength cannot be obtained.

Further, as shown in FIG. 7, conventionally, as shown in FIG. 7, a pair of long lengths for applying a rotational force to the coil spring S has been used for the purpose of making the feed rate in the axial direction of the coil spring S always constant. The rollers E and F, and the claw G arranged axially movable above the rollers E and F,
By rotating the coil spring S by the rollers E and F and moving the claw body G axially forward, the claw body G is brought into contact with the rear end side of the coil spring S in the feed direction. Then, it is also performed to forcefully feed it to the front side in the axial direction. However, according to the above configuration, although it is possible to constantly feed the coil spring S with the pawl G at a constant speed, when the coil spring S is forcibly fed by the pawl G,
The tip side of the claw G is the rear end portion S of the coil spring S.
Since the coil spring S may be stopped from rotating by stopping at 1, the projection amount of the small steel particles received by the coil spring S varies depending on the circumferential direction. Similarly, the coil spring S cannot obtain a predetermined strength.

Further, as the small steel particles used in the above shot peening for coil springs, since the irregular spherical body having a non-round cross section is used, the projection direction from the projection part A is restricted to a predetermined direction. Therefore, at the time of projection from the projection unit A, the small steel particles are projected not only on the coil spring S but also on the rollers C, D or E, F, the claw G, and the like. Moreover, since the steel small particles having high hardness are used, the rollers C, D or E, F, the claw bodies G, etc. are projected by the projection of the steel small particles. There is also a problem that the steel small particles themselves may be damaged by the collision with each of them, and the steel small particles are largely consumed to increase the running cost.

An object of the present invention is to reliably and accurately rotate and linearly feed a coil spring so that the entire outer surface of the coil spring can be uniformly shot peened, and only the coil spring can be processed. Another object of the present invention is to provide a shot peening for a coil spring, which is capable of projecting small steel particles and damaging other devices, and preventing damage to the small steel particles themselves.

[0009]

To achieve the above object, the shot peening for a coil spring according to the present invention as defined in claim 1 is a projection part 3 for projecting small steel particles, and the projection part 3 of the projection part 3. A long roller 5 for rotation, which is located in front of the projection direction and rotates the coil spring S, is arranged in parallel along the length direction of the roller 5, and the coil spring S is arranged in the length direction of the roller 5. The belt conveyor 6 forcibly carrying the sheet is provided.

The invention according to claim 2 further comprises: a guide plate 8 for restricting the projection direction of the small steel particles on the projection unit 3 in a direction in which the long roller 5 for rotation and the belt conveyor 6 face each other. It is equipped with.

Further, in the invention according to claim 3, a small gap for supporting the coil spring S is provided between the rotating long roller 5 and the belt conveyor 6, and the small steel particles by the guide plate 8 are provided. The projection direction of is regulated to be narrower than the gap.

[0012]

With the above structure, the rotating long roller 5 is
The rotational force is applied to the coil spring S at the same time, and the linear conveyor force is forcibly applied to the coil spring S by the belt conveyor 6. Therefore, the roller 5 and the belt conveyor 6 perform the coil transfer. It is possible to reliably and accurately rotate and linearly feed the spring S, and accordingly, the small steel particles from the projection unit 3 are uniformly projected over the entire length direction and the circumferential direction of the coil spring S. That is, the entire outer surface of the coil spring S can be uniformly shot peened, and the coil spring S can be reliably strengthened to a predetermined strength.

According to the second aspect of the present invention, a guide for restricting the projection direction of the small steel particles to the projection unit 3 in the direction in which the long roller 5 for rotation and the belt conveyor 6 face each other. Since the plate 8 is provided, even when a deformed spherical body having a non-circular cross section is used as the steel small particles, the steel small particles from the projection unit 3 are reliably transferred to the coil spring S by the guide plate 8. And can be projected accurately, and by applying uniform shot peening to the entire outer surface of the coil spring S,
This coil spring S can be reliably strengthened to a predetermined strength.

Further, according to the third aspect of the present invention, a gap that can support the coil spring S is provided between the long rotating roller 5 and the belt conveyor 6, and the guide plate 8 is provided.
Since the projection direction of the small steel particles is regulated to be narrower than the gap, the projection direction of the small steel particles projected from the projection unit 3 is set by the guide plate 8 to the roller 5
Between the belt spring 6 and the belt conveyor 6 is regulated in the range of the gap, and is projected only to the coil spring S conveyed along this gap, that is, the coil spring conveyed along the gap. When S is not opposed to the front side of the projection unit 3 in the projection direction, the projection unit 2
The small steel particles projected from are projected to the outside through the gap without colliding with the roller 5 or the belt conveyor 6, and therefore the small steel particles from the projection unit 3 are discharged. By projecting only the coil spring S by the guide plate 8 and performing good shot peening on the coil spring S, it is possible to prevent the small steel particles from being projected onto the roller 5 and the belt conveyor 6. These rollers 5
And prevent the belt conveyor 6 from being damaged,
Moreover, it is possible to prevent the small steel particles from being damaged, reduce the consumption thereof, and reduce the running cost.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The coil spring shot peening shown in FIGS. 1 and 2 is provided with a hopper 2 for accommodating small steel particles on the outer upper side of a main body casing 1 and projecting on the upper inner side of the casing 1. While providing the part 3, the projection part 3 and the hopper 2 are connected via a supply pipe 4 having a particle adjusting valve 41 capable of adjusting the amount of particles supplied from the hopper 2, while the casing 1 of the casing 1 is connected. On the inner lower side and on the front side in the particle projection direction of the projection unit 3, a long roller 5 for rotation that applies a rotational force to the coil spring S, and a belt that applies a forced linear feed force to the coil spring S. Conveyor 6
And are installed side by side.

More specifically, the rotating long roller 5 is used.
Has a pair of bearing members 5 on both sides in the length direction of the rotating shaft 51.
2, 52 are supported horizontally, and one side of the rotary shaft 51 is interlocked with a first motor 54 via a power transmission clutch 53, and the roller 5 is driven by the drive of the first motor 54. By the rotation, a rotational force is applied to the coil spring S supplied to the outer peripheral portion of the roller 5.

The belt conveyor 6 has an endless conveyor belt 63 hung between a pair of driving and driven wheels 61 and 62, and a support shaft 64 extending from the wheels 61 and 62.
And a pair of upper and lower bearing members 65 for bearing-supporting the power transmission clutch 6 extending from the drive wheel 61.
6 is linked to a second motor 67 via the motor 6, and the conveyance belt 63 is rotated via the drive wheel 61 when the second motor 67 is driven. An axial linear feed force is applied to the spring S. Further, the conveyor belt 63
Is separated from the long roller 5 for rotation by its upper side,
In addition, the lower side is arranged in parallel to the side portion of the roller 5 so that the lower side is close to the roller 5. Further, at a position where the rotating long roller 5 and the conveyor belt 63 face each other, A predetermined gap T1 capable of holding the coil spring S is formed, that is, the outer peripheral surface of the roller 5 that is closest to the conveyor belt 63 and the portion of the lower end side of the conveyor belt 63 that is closest to the roller 5. Between the coil spring S and
The gap T1 having a width smaller than the outer diameter of the coil spring S is provided, and the coil spring S is placed on the roller 5 and the conveyor belt 63 above the gap T1 to rotate the coil spring S. While being made to move, it is forcedly fed straight from one side to the other side in the axial direction along the gap T1.

Further, as shown in FIG. 3, the projection unit 3 further includes a pair of first and second side plates 31 and 32 each having a disc shape and arranged to face each other at a predetermined interval. A plurality of blades 3 radially installed between these side plates 31 and 32
3 is provided, and the rotating shaft 34 is provided on the first side plate 31,
A third motor 35 is connected to the rotary shaft 34, and an insertion port 32a into which the tip end side of the supply pipe 4 is inserted is provided in the central portion of the second side plate 32, so that the third motor 35 is driven to drive each of the above. By rotating the blades 33, the small steel particles supplied from the supply pipe 4 between the side plates 31 and 32 are linearly fed while being rotated through the rotating roller 5 and the belt conveyor 6. The projection is made on the entire outer peripheral surface of the coil spring S.

Further, as shown in FIG. 4, the projection unit 3 opens the lower end side of the supply pipe 4 at an intermediate portion of the compressed air discharge pipe 7 connected to a compressor or the like, and then from the discharge pipe 7. The small steel particles supplied from the supply pipe 4 may be projected onto the coil spring S by the discharged compressed air.

Then, the projection direction of the small steel particles projected from the projection unit 3 is set on the lower side of the projection unit 3 toward the front side in the projection direction. A pair of guide plates 8 and 8 which are regulated in the direction are arranged so as to face each other along the length direction of the roller 5 and the belt conveyor 6. At this time, the facing distance T2 between the guide plates 8 is set such that the long roller 5 for rotation and the conveyor belt 63.
It is formed to be narrower than the gap T1 provided between and, and when the small steel particles are projected from the projection unit 3, the small steel particles are conveyed along the gap T1. The projection is performed only on the coil spring S, and is not projected on the rollers 5 and the conveyor belt 63 other than the coil spring S. The guide plates 8 and 8 are provided on the inner wall of the casing 1 with a support plate 81 and a support rod 82, respectively.
Is held at the interval T2.

As described above, when the facing distance T2 between the guide plates 8 provided on the lower side of the projection unit 3 is narrower than the clearance T1 provided between the roller 5 and the belt conveyor 6. Since the small steel particles projected from the projection unit 3 are projected only on the coil spring S and are not projected on the rollers 5 and the conveyor belt 63 other than the coil spring S, the rollers 5 and the conveyor belt 63. As the material, a rubber material that is weak against the projection of the small steel particles can be used, and by using this rubber material, the contact resistance with respect to the coil spring S can be increased, and the coil spring S can be rotated and linearly fed. It becomes possible to perform the above-mentioned process more satisfactorily. Further, both the roller 5 and the conveyor belt 63 are made of rubber, so that the contact resistances of both of them to the coil spring S are increased, and the rotational force and the linear feed force of the coil spring S cancel each other out. If the coil spring S cannot be stably conveyed, the roller 5 side may be made of metal and the outer surface of the roller spring S may be provided with concavities and convexities for imparting a compulsory rotational force. You can do it.

Further, inside the casing 1, on the lower side of the rotating long roller 5 and the belt conveyor 6,
A vibrating recovery device 9 for recovering the small steel particles projected from the projection unit 3 is provided, and the small steel particles recovered by the recovery device 9 are lifted on the side of the recovery device 9 to remove the small steel particles. The bucket type transfer device 10 for returning to the inside of the hopper 2 is provided.

Next, the operation of the shot peening for the coil spring configured as described above will be described. First, the small steel particles housed in the hopper 2 are supplied to the projection unit 3 via the supply pipe 4, and the third small particles provided in the projection unit 3 are supplied.
The small steel particles are projected downward by driving the motor 35, and the roller 5 is driven by driving the first and second motors 54 and 67 provided on the rotating long roller 5 and the belt conveyor 6. And the belt conveyor 6 are respectively rotated. By placing the coil spring S on the roller 5 and the belt conveyor 6, a rotational force is applied to the coil spring S by the roller 5, and the coil spring S is forced by the belt conveyor 6. Therefore, the roller 5 and the belt conveyor 6 reliably and accurately rotate and linearly feed the coil spring S, and the projection unit 3
It is possible to uniformly project the small steel particles from the coil spring S over the entire length direction and the circumferential direction of the coil spring S, that is, to perform uniform shot peening on the entire outer surface of the coil spring S. As a result, the coil spring S can be reliably strengthened to a predetermined strength.

On the lower side of the projecting section 3, a pair of guide plates 8 and 8 are provided for restricting the projecting direction of the small steel particles in the direction in which the rotating long roller 5 and the belt conveyor 6 face each other. Are provided so as to face each other, even when a deformed spherical body having a non-circular cross section is used as the steel small particles, the small steel particles from the projecting section 3 are guided by the guide plates 8 to the coil spring S. It is possible to perform a uniform shot peening process on the entire outer surface of the coil spring S by reliably and accurately projecting the coil spring S, and the coil spring S can be reliably strengthened to a predetermined strength.

Further, a gap T1 capable of holding the coil spring S is formed between the long rotating roller 5 and the belt conveyor 6, and a gap T2 between the guide plates 8 is formed.
Is formed to be narrower than the gap T1. Therefore, the projection width direction of the small steel particles projected from the projection unit 3 is regulated within the range of the gap T1 by each of the guide plates 8. It is not projected to other than the coil spring S conveyed along T1, that is, the coil spring S conveyed along the gap T1 is not located at the front side in the projection direction of the projection unit 3. At this time, the small steel particles projected from the projection unit 2 pass through the gap T1 and are collected on the collecting device 9 side without colliding with the roller 5 and the belt conveyor 6, and therefore, It is possible to prevent the steel small particles from being projected onto the rollers 5 and the belt conveyor 6, to prevent the rollers 5 and the belt conveyor 6 from being damaged, and to prevent the small steel particles from being damaged. Erase The least to be able to reduce the running cost. The small width of the steel particles projected from the projection unit 3 is smaller than the gap T1 between the roller 5 and the belt conveyor 6 by the guide plates 8 and is held on the gap T1. Despite that the interval T2 is set to be smaller than the outer diameter of the coil spring S, the small steel particles from the projection unit 3 are restricted by the guide plates 8 in the projection width direction. Even though the coil spring S is projected onto only a part of the outer circumference of the coil spring S, a forcible rotational force is applied to the coil spring S by the roller 5, so that the entire outer circumference of the coil spring S is excellent. Shot peening can be applied.

Then, the small steel particles projected onto the coil spring S and the next coil spring S are projected downward from between the roller 5 and the belt conveyor 6 until the next coil spring S is conveyed. Small steel particles and the like are recovered by the recovery device 9 and returned to the hopper 2 by the bucket type transfer device 10.

[0027]

As described above, the shot peening for the coil spring according to the present invention as set forth in claim 1 is provided with the projection part 3 for projecting small steel particles, and is located in front of the projection part 3 in the projection direction. Rotating long roller 5 for rotating the coil spring S
And the belt conveyor 6 that is arranged in parallel along the length direction of the roller 5 and forcibly conveys the coil spring S in the length direction of the roller 5.
The rotation and straight advance of the coil spring S can be reliably and accurately performed by the belt conveyor 6 and the small steel particles from the projection unit 3 in the length direction and the circle of the coil spring S. The coil spring S can be uniformly projected over the entire circumferential direction, that is, the entire outer surface of the coil spring S can be uniformly shot peened, and the coil spring S can be reliably strengthened to a predetermined strength.

According to the second aspect of the present invention, the guide for restricting the projecting direction of the small steel particles to the projecting section 3 in the direction in which the long rolling roller 5 and the belt conveyor 6 face each other. Since the plate 8 is provided, even when a deformed spherical body having a non-circular cross section is used as the small steel particles, the small steel particles from the projection unit 3 are transferred to the coil spring S via the guide plate 8. It is possible to project reliably and accurately, and by applying uniform shot peening to the entire outer surface of the coil spring S,
This coil spring S can be reliably strengthened to a predetermined strength.

Further, according to the third aspect of the invention, a gap capable of supporting the coil spring S is provided between the rotating long roller 5 and the belt conveyor 6, and the guide plate 8 is provided.
Since the projection direction of the small steel particles is regulated to be narrower than the gap, the projection direction of the small steel particles projected from the projection unit 3 is set by the guide plate 8 to the roller 5
The coil spring S formed between the belt conveyor 6 and the belt conveyor 6 can be regulated within the range of the gap, and is conveyed along the gap.
Other than that, it is not projected, that is, when the coil spring S conveyed along the gap is not positioned opposite to the front side of the projection unit 3 in the projection direction,
The small steel particles projected from the projection unit 2 are transferred to the roller 5
Since the small particles made of steel from the projection unit 3 are projected only on the coil spring S by the guide plate 8, the small particles are projected to the outside through the gap without colliding with the belt conveyor 6. While the coil spring S can be subjected to good shot peening, it is possible to prevent the small particles of steel from being projected onto the roller 5 and the belt conveyor 6,
It is possible to prevent the roller 5 and the belt conveyor 6 from being damaged, and also to prevent the small steel particles from being damaged, and to reduce the consumption thereof to reduce the running cost.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing shot peening for a coil spring according to the present invention.

FIG. 2 is a schematic side view of a main part thereof.

FIG. 3 is a partially cutaway side view showing a projection unit.

FIG. 4 is a partially cutaway side view showing another embodiment of the projection unit.

FIG. 5 is a side view showing a conventional example.

FIG. 6 is a front view thereof.

FIG. 7 is a plan view showing another conventional example.

[Explanation of symbols]

 3 Projection unit 5 Long roller for rotation 6 Belt conveyor 8 Guide plate S Coil spring T1 Gap

Claims (3)

[Claims] 1. A projection unit (3) for projecting small steel particles,
A long roller for rotation (5) located in front of the projection part (3) in the projection direction and for rotating the coil spring (S), and arranged in parallel along the length direction of the roller (5), and A shot peening for a coil spring, comprising: a belt conveyor (6) forcibly conveying the coil spring (S) in the length direction of the roller (5). 2. The projection unit (3) is provided with a guide plate (8) for restricting the projection direction of small steel particles in a direction in which the long roller for rotation (5) and the belt conveyor (6) face each other. The shot peening for a coil spring according to claim 1. 3. A gap capable of supporting a coil spring (S) is provided between the rotating long roller (5) and the belt conveyor (6), and the guide plate (8) is provided with the gap. The shot peening for coil springs according to claim 1, wherein the projection direction of the small steel particles according to (4) is restricted to be narrower than the gap.