JP2016068158A - Shot blast method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shot blast method for keeping quality of each work-piece to be high quality without deflection by evenly projecting projection material to the work-piece.SOLUTION: A work-piece W is fixed and arranged, projection material is projected to each surface configuring the work-piece from a desired angle, and the projection material is evenly projected to the work-piece, thereby, action due to projection to the work-piece evenly acts on the entire work-piece, compressive stress generated on the surface of the work-piece becomes even without deflection, thus, distortion of the work-piece can be made stable.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shot blasting method used for sand removal after casting or surface purification in a casting process.

Conventionally, as a shot blasting method for projecting a projection material onto a workpiece, a shot blasting method for projecting a projection material while rotating the workpiece is known.
For example, it describes in patent document 1 (Unexamined-Japanese-Patent No. 2006-167850).

JP 2006-167850 A

As described above, there has been disclosed a shot blasting method in which a workpiece jig for placing a workpiece in a projection chamber is provided as described above, and the projection material is projected onto the entire workpiece by rotating the jig.
However, the shot blasting method described in Patent Document 1 has the following problems.
When performing shot blasting, since the work rotates, the surface that receives the shot does not become a fixed direction with respect to the direction in which the projection material is projected, and the direction in which the projection material hits the contact surface of the work changes. .

Also, depending on the method of setting the work on the work jig, it is difficult to control the projection amount and the projection intensity on the entire work because it becomes a shadow with respect to the projection or the irradiation distance changes.
Therefore, a difference in the amount of projection of the projection material onto the workpiece surface occurs, resulting in a difference in the acting force (compression stress) on the workpiece caused by the projection of the projection material.
If the action on the workpiece is uneven, the compressive stress on the workpiece surface will not be uniform, and in particular for thin workpieces, it will cause distortion of the workpiece.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a shot blasting method that keeps the quality of each work in a high quality without unevenness by projecting the projection material evenly onto the work.

  In order to solve the above problems, the present invention is a shot blasting method for projecting a projecting material onto a work using a shot blasting device having a projection chamber provided with a projecting means for projecting the projecting material onto a work. This is a shot blasting method in which the projection material is projected from a desired angle onto each surface constituting the workpiece, and the projection material is evenly projected onto the workpiece.

Further, the workpiece is a thin object having a plane portion, and equivalent projection is performed from both sides of the workpiece to both sides of the plane portion.
Further, the workpiece is projected by being suspended and fixed by a lifting tool.
Further, the workpiece is projected onto the workpiece while being conveyed in the horizontal direction by the conveying means.

  In the present invention, the shot blasting method refers to a method of projecting a projection material onto a workpiece, and includes shot peening and the like.

The present invention can evenly project the projection material to be projected onto the workpiece, and can realize the stability of the quality of the workpiece.
Moreover, since the projection amount of the projection material onto the workpiece can be projected without unevenness, the best projection can be efficiently performed without projecting more than necessary, and the number of projection materials can be reduced.
Furthermore, projection with a small projection amount is possible, and the compressive stress on the workpiece surface due to projection can be minimized without excessive projection.

It is side surface sectional drawing of the shot blasting apparatus which concerns on Example 1 of this invention. It is a plane sectional view of the shot blasting device concerning Example 1 of the present invention.

Hereinafter, embodiments of the present invention will be described in detail.
The shot blasting device includes a projection chamber 1 inside, and projects a projection material (for example, a material such as a steel ball or sand) onto the workpiece W.
In the upper part of the projection chamber 1, there is provided a conveying means 7 (for example, by belt or chain drive) for suspending the workpiece W and conveying it in the horizontal direction.
The conveying means 7 has a moving part 8 and a hanging part 9. The moving part 8 can attach a plurality of hanging parts 9, and the hanging parts 9 attached at substantially equal intervals are provided in the projection chamber 1 at a constant speed. The workpiece W can be moved horizontally from the entrance 5 to the exit 6.
The hanging part 9 is attached to the moving part 8, and a hook 10 for suspending and fixing the work W is provided at the lowermost part.

The projection chamber 1 has an entrance 5 for carrying in the workpiece W and an outlet 6 for carrying it out at both ends, respectively, and is provided with projection means 11 for projecting the projection material onto the workpiece W from the two side surface portions 2.
The two side surface portions 2 of the projection chamber 1 are provided facing each other in the conveying direction of the conveying means 7 for the workpiece W, and are composed of a right side surface portion 3 and a left side surface portion 4, and from the two side surface portions 2 to the workpiece W. The projection material is projected.
The projection means 11 provided on each side surface portion 2 is disposed at a position facing the right side surface portion 3 and the left side surface portion 4, respectively, and is configured such that an equivalent projection is made on both sides of the workpiece W. Has been.

The projection means 11 of the present embodiment is provided facing the workpiece, the right side surface portion 3 includes a right projection portion, and the left side surface portion 4 includes a left projection portion.
Moreover, a pair of projection means is arrange | positioned in two places, and the 1st projection means 12 and the 2nd projection means 13 are provided in the simultaneous.
The first projection means 12 has a first right projection section 12a and a first left projection section 12b facing each other, and the second projection means 13 has a second right projection section 13a and a second left projection section 13b facing each other. Is arranged.

  In the present embodiment, the projection means 11 shows an example in which a pair of projection means 11 is arranged at two locations. However, depending on the work situation such as the amount and material of the projection material or the material and shape of the workpiece W. It is also possible to change the configuration.

Next, the operation of the shot blasting apparatus having the above configuration will be described.
The workpiece W is suspended and fixed to a hook 10 provided on the suspension portion 9 of the transport means 7. The workpiece W of the present embodiment has a thin shape (for example, a support) having a flat surface portion, and is fixed to the hook 10 so that the flat surface portion faces the side surface portion 2 side.

The workpiece W that is horizontally moved by driving the conveying means 7 is carried into the projection chamber 1 from the entrance 5 provided in the projection chamber 1.
The workpiece W carried into the projection chamber 1 is first moved to the projection area of the first projection means 12. The same projection material is simultaneously projected from the first right projection unit 12a and the first left projection unit 12b provided in the first projection unit 12.

  At this time, since the projection material is evenly projected on both sides of the back and front of the plane portion of the workpiece W, the action of the projection onto the workpiece acts uniformly on the entire workpiece. Therefore, the compressive stress generated on the surface of the workpiece W becomes uniform without being biased, and the distortion of the workpiece W is stabilized. Furthermore, since the amount of projection can be controlled to the minimum, the compressive stress on the workpiece surface can be set to a minimum, which is particularly advantageous for thin workpieces that are easily deformed.

Next, the workpiece W that moves horizontally by driving the conveying means 7 is moved to the projection area of the second projecting means 13.
Here, similar projection material is simultaneously projected from the second right projection unit 13a and the second left projection unit 13b provided in the second projection unit 13 in the same manner as described above.
Thereafter, the work is carried out from the exit 6 of the projection chamber 1 to the outside of the projection chamber 1 by the conveying means 7 and the shot blasting process is completed.

  The test results of the present invention are shown below. Two types of shot blasting were performed on the test plate having a thickness of 1.3 mm, that is, the above-described prior art implementation method and the implementation method according to the present invention, and the deformation amount of the test plate at that time was measured.

The test plate was attached to both surfaces of the flat portion of the thin plate workpiece while being set on a holder, and shot blasting was performed on the workpiece. At this time, in the conventional implementation method, the workpiece is rotated and the projection material is projected, and in the implementation method of the present invention, the projection material is projected onto both surfaces of the flat portion without rotating the workpiece.
Table 1 shows the results of measuring the deformation amount (arc height value) of the contact surface of the test plate when shot blasting is performed by two methods.

これによれば、本発明のショットブラスト方法によれば、従来の方法に比べてワークの変形量のバラツキが小さくなっており、投射材の投射によって受ける試験板に加わる応力が均等になることがわかる。
したがって、本発明のショットブラスト方法によれば、薄肉のワークであっても材料の歪みが少ないショットブラスト処理を行なうことが可能となる。

According to this, according to the shot blasting method of the present invention, the variation in the deformation amount of the work is smaller than that in the conventional method, and the stress applied to the test plate received by the projection of the projection material can be equalized. Recognize.
Therefore, according to the shot blasting method of the present invention, it is possible to perform shot blasting processing with less material distortion even for a thin workpiece.

Moreover, it shows below as another Example of this invention.
In the above-described embodiment, the workpiece is described as an example of a thin workpiece. However, the present invention is not limited to the shape of the work, and can be applied to a work other than a thin object that is a polyhedron having a plurality of surfaces forming the work.
In the present invention, when the workpiece is composed of a polyhedron, for each surface forming the workpiece, each projection material is projected without rotating the workpiece using projection means for projecting the projection material equally to each surface. By projecting onto the surface, the same effects as in the above-described embodiments can be obtained.
Therefore, according to the present invention, it is possible to project the projection material evenly without being limited to the shape of the workpiece, and the optimum shot blasting method can be implemented.

DESCRIPTION OF SYMBOLS 1 Projection chamber 3 Right side surface part 4 Left side surface part 5 Entrance 6 Exit 7 Conveyance means 8 Moving part 9 Hanging part 10 Hook 12 First projection means 12a First right projection means 12b First left projection means 13 Second projection means 13a Second right Projection means 13b Second left projection means

Claims (4)

A shot blasting method for projecting a projection material onto a workpiece using a shot blasting device having a projection chamber provided with a projection means for projecting the projection material onto the workpiece, to which the workpiece is fixedly arranged and to each surface constituting the workpiece A shot blasting method in which a projection material is projected from a desired angle, and the projection material can be evenly projected onto a workpiece. 2. The shot blasting method according to claim 1, wherein the workpiece has a thin shape having a flat portion, and equivalent projection is performed from both sides of the workpiece to both surfaces of the flat portion. The shot blasting method according to claim 1, wherein the workpiece is projected by being suspended by a lifting tool. The shot blasting method according to any one of claims 1 to 3, wherein the workpiece is projected onto the workpiece while being conveyed in a horizontal direction by a conveying means.

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