JPS63130295A - Method for heat treatment of work by laser light - Google Patents

Abstract

PURPOSE:To reduce the heat treatment area of the work surface and thermal strain and to improve the intensity of a heat treated part by simultaneously performing a heat treatment from a different face direction by using plural laser machining heads on the work heat treatment part. CONSTITUTION:A heat treatment is simultaneously performed by laser machining heads 3, 3 from the front and back faces of works 1a, 1b. The heat treatment of the both sides of the work is thus sufficient on each half at one side and consequently the thermal strain at both sides is reduced, the heat treated area is reduced, the intensity of the combination part is improved and the reliability in the heat treating can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to heat treatment of a workpiece (such as i-welding or hardening) using a laser beam.

[Conventional technology]

Conventionally, as a method for welding the joint surfaces of two workpieces using a laser processing machine, for example, two methods are used as shown in Figure 4.
The joint part (2) of two works (1a) and (1b) is
Welding was only performed from the surface side using a laser processing head (8).

[Problem that the invention seeks to solve]

However, since the conventional welding method is performed only from one side of the workpiece, the melting (melting) of the workpieces (Ia) and (1b) is concentrated on one side, and heat treatment is required to a depth of 1f at the joint of the workpieces. As a result, the heat-treated surface area becomes large, and thermal distortion (4) remains as shown in FIG. As a result, work (1a).

There was a problem that the strength of the joint (1b) was reduced.

This invention was made in order to solve the above-mentioned problems, and the purpose is to reduce the heat treatment area of the workpiece surface, improve the joint strength, and obtain a highly reliable workpiece heat treatment method. shall be.

[Means for solving problems]

In the workpiece heat treatment method according to the present invention, a workpiece heat treatment portion is simultaneously heat treated from different surface directions using a plurality of laser processing heads.

[Effect]

In this invention, by simultaneously heat-treating the heat-treated portions of the workpiece from different surface directions, for example, from the front and back surfaces of the workpiece, the workpiece only needs to be melted in half on each side. Strength can be improved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is an external view showing an example of a workpiece heat treatment method using a laser source. (1a) and (1b) are workpieces arranged vertically, (ljl,
There are two laser processing heads arranged opposite to the joint part (2) on the front and back sides of 1b).

By moving the workpieces (1a) and (1b) in the above state, the joint part (2) of the workpieces (1a) and (1b) is simultaneously exposed to the laser processing head i1 from the front and back surfaces of the workpieces (1a) and (1b).
1+, (81), and the workpiece joints are welded together. That is, according to the above heat treatment method, as shown in FIG. , (Because heat treatment is performed at the same time at 81, heat treatment is done on the front and back of the workpiece on half of each side.
Therefore, thermal distortion (4) on the front and back sides is small, and the heat treatment area can be small.

In the embodiment, the workpieces (1a) and (1b) are arranged vertically, but the workpieces may be arranged horizontally and heat treated with a laser processing head from above and below.

In addition, the L workpiece (1a) and (a) shown in Fig. 5 are
In the case of welding in a shape, heat treatment may be performed using six laser processing heads (8) from three locations: the joint parts (2), (2) and the back surface of the joint part of the workpiece (1a).

Further, the workpiece heat treatment method using the VC of the present invention includes a workpiece (1
Although we have explained the cases of welded joints in a) and (1b),
The same can be applied to heat treatment such as surface hardening of the workpiece. In addition, it is widely applicable to heat treatment of amorphous (non-crystalline metal).

〔Effect of the invention〕

As explained above, according to the present invention, the heat-treated portion of the workpiece is simultaneously heat-treated from different vertical directions using multiple laser processing heads, thereby reducing the heat-treated area and thermal strain on the surface of the workpiece, thereby increasing the strength of the heat-treated portion. This makes it a highly reliable workpiece heat treatment method.

[Brief explanation of the drawing]

Fig. 1 is an external view of a heat treatment method according to an embodiment of the present invention, Fig. 2 is an explanatory view of a workpiece heat treatment section, Fig. 6 is an external view of another example of the heat treatment method, and Fig. 4 is a conventional heat treatment method. FIG. (1a), (1b)... Workpiece (2) e-joint (8) Working head (4)... Thermal strain Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A method of heat treating a workpiece using a laser beam, such as welding or hardening a workpiece, characterized in that the heat treatment portion of the workpiece is simultaneously treated from different surface directions using a plurality of laser processing heads.