JPS5844915A - Manufacture of small-sized precise extruded shape - Google Patents

Abstract

PURPOSE:To manufacture sections of high dimensional accuracy at a high yield rate by heat-treating an extruded shape in an artificial aging process after cooling, and securing straightness and accuracy in shape and dimension by correcting device in a straightening process. CONSTITUTION:A very small-sized precise extruded shape of, for instance, Al or Al alloy formed by extrusion in a extrusion process is cooled in the succeeding cooling process. Next, after heat treating in a heat treating process that is, an artificial aging process, straightness and accuracy in shape and dimension are obtained by a stretcher, roll straightener, etc. in a straightening process. Finally, the surface is finished in a surface treating process. When the shape is to be cut during a series of processes, cutting process may be passed through after cooling process. However, it is desirable to cut the shape after the straightening process.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing precision extruded sections made of, for example, aluminum or aluminum alloys, particularly precision extruded sections that are small or extremely small and require strict dimensional accuracy and accuracy.

As shown in Fig. 1, the conventional general method for manufacturing this type of shaped material is to cool the extruded shaped material, then use a stretcher, rolls, etc. to achieve straightness, shape, and precision. According to this process, JIS H4100 standard for aluminum and aluminum alloy extruded shapes is used. However, for extruded shapes that require dimensional tolerances greater than those of special paper, especially small or extremely small extruded shapes, The advantages of being small, extremely thin, and precise in use clearly appear as disadvantages in the heat treatment process (artificial aging treatment process). i.e. 1, after extrusion, 160
0 to 2301: There is a significant possibility that thermal deformation such as bending, twisting, or warping will occur in the shape material during the heat treatment process, or that the shape material will be bent due to its own weight. Even though it went through the direct process, it has to go through the straightening process again. Going through the same process twice in this way is unfavorable in terms of process, workability, and equipment, and poses problems such as an increase in the cost of the shaped material.

This invention was made with the intention of solving the above-mentioned problems, and is characterized by obtaining small-sized extruded sections or ultra-small extruded sections with high dimensional accuracy at a high yield. do. Embodiments of the present invention, which are intended to provide a method for manufacturing small-sized precision extruded sections, are shown in Figures 2 and 3 below.
This will be explained in detail based on the figures.

Fig. 2 is a block diagram showing the process of each process in the manufacturing method of this invention. ) is cooled in the next cooling step, then heat treated in the heat treatment, that is, artificial aging treatment step, and then straightened by a straighter, roll straightening machine, etc. in the straightening step, and then subjected to the final step of surface treatment. The surface is finished during the process. In addition, when cutting the shaped material during this series of processes, it is possible to pass the cutting process after the cooling process, as shown by the virtual line in Fig. 2, but it is possible to prevent dangling on one cut surface. From this point of view, it is desirable to do it after the straightening process.

As above, extrusion → cooling → heat treatment (artificial aging treatment) →
In the manufacturing method of the present invention which goes through straightening → surface treatment, for example, the lower bent piece 2 of the profile 1 as shown in FIG.
This prevents the parts 3 from falling inward on the heat treatment shelf material due to their own weight during heat treatment, or the entire shape being bent, twisted, or warped in the conventional method. . Therefore, in the past, as a means of dealing with the above deformation, it was necessary to pass the stretcher and rollers all the way through again to improve the product yield, and sometimes the product was deformed to such an extent that it could not be passed through the straightening rollers, so it was difficult to improve the yield. However, according to this invention, the product yield could be significantly increased from about 72% to 94%.

As explained above, according to the manufacturing method of the present invention,
When forming small precision extruded sections, by going through a minimum number of processing steps, it is possible to obtain sections with excellent dimensional accuracy, improve yields, and Its utility value is remarkable because it can reduce the cost of materials.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the manufacturing process of a general shape material, FIG. 2 is a block diagram showing the process route of the manufacturing method of the present invention, and FIG. 3 is a sectional view showing an example of the shape material. In the figure, l Shape 2.3 Lower bent piece 0 Patent applicant Nippon Light Metal Co., Ltd.

Claims (1)

[Claims] After being cooled in the complete cooling process of the extruded shape in the extrusion molding process, it is heat treated in the artificial aging treatment process, and then in the straightening process, it is used with straightening means such as a straightening machine and rolls to achieve straightness and shape and size accuracy. A manufacturing method for small precision extruded shapes, characterized by: