JP2001252729A - Press apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a desired product by purposively heating a magnesium alloy relatively poor in formability. SOLUTION: A slide is stopped at a fixed position by means of a press machine capable of numerically controlling a descending a movement of a slide and, a magnesium alloy is heated with a die during stopping, successively it is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press working device. The press working apparatus is applied when a material having relatively poor workability is heated and then formed. INDUSTRIAL APPLICABILITY The present invention is applied to the molding of a body or a case made of a magnesium alloy, such as a body of a camera or a body of a notebook computer.

[0002]

2. Description of the Related Art Bodies and cases made of magnesium alloy are conventionally manufactured by a thixomold method.
No drawing is found. On the other hand, in press working, it is conceivable to heat the coil material, but in order to correct the heated coil material and supply it to the press machine, many technical measures such as providing heat resistance to devices such as uncoilers and levelers are required. Problem arises.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to obtain a desired product by heating a material having relatively poor moldability for a purpose.

[0004]

According to the present invention, the sliding movement of the slide is stopped at a fixed position, the material is heated by a mold during the stop, and then the molding is performed. More specifically, the invention of claim 1 uses a press machine capable of numerically controlling the up-and-down movement of the slide, temporarily stops the up-and-down movement of the slide, and heats the workpiece with a mold during this time.
Thereafter, the workpiece was formed by a mold. Further, in the invention of claim 2, in addition to the configuration of claim 1, the material of the work is a magnesium alloy.

[0005]

1, an upper plate 1 is fixed to the lower surface of a slide (not shown) of a press machine, and a lower plate 2 is fixed to an upper surface of a bolster (not shown) of the press machine.
A punch 3 is fixed to the upper plate 1, and a stripper 4 is provided on an outer peripheral portion of the punch 3 so as to be able to move up and down. The stripper 4 is urged downward by a spring 5. The upper plate 1 is provided with a stopper bolt 11 for preventing the stripper 4 from lowering unnecessarily. The stripper 4 prevents the product from sticking to the punch 3 after pressing.

A die 7 is fixed to the lower plate 2 so as to face the punch 3. A knockout plate 8 is incorporated inside the die 7 so as to be able to move up and down. Knockout board 8
Is urged upward by a spring 9. The lower plate 2 is provided with a stopper bolt 12 for preventing the knockout plate 8 from rising unnecessarily. The knockout plate 8 has a function of extruding the product narrowed in the die 7 from the die 7. Each of the above members constitutes a die for press working.

A heater 10 for heating the work 6 is embedded in components such as the punch 3, the stripper 4, the die 7 and the knockout plate 8. The mold is heated by the heater 10. A heat insulating sheet is interposed between the upper plate 1 and the slide and between the lower plate 2 and the bolster to prevent the heat of the mold from being transmitted to the components of the press machine.

In FIG. 2, the horizontal axis represents time, and the vertical axis represents the height position of the slide. In this embodiment, the movement of the slide of the screw press is shown. Screw press
It refers to a press machine that has a structure in which a slide is driven by a servomotor via a screw mechanism, and that can numerically control the vertical movement of the slide.

In the drawing, points a and e indicate the uppermost position of the slide, that is, the top dead center. Point d indicates the lowermost position of the slide, that is, the bottom dead center. The slide moves from point a to points b and c
To the bottom dead center d. Subsequently, the slide rises from bottom dead center d and reaches top dead center e. The work 6 is pressed by the slide repeating the above series of movements,
The product is obtained.

In FIG. 2, the height of the slide does not change from point b to point c, and the slide is stopped during this time.
The positional relationship between the work 6 and the mold is shown in FIG.
The work 6 is maintained in the state shown in FIG. In the case of a magnesium alloy, it is heated to about 200 ° C. The heating time is about 5 seconds for a magnesium alloy having a thickness of 0.6 mm.

In this embodiment, since the above-mentioned screw press is used, the pattern of the vertical movement of the slide shown in FIG. 2 can be freely changed. For example, the time from point b to point c can be optimized according to the material and the thickness of the work 6 to be pressed.

[0012]

According to the present invention, a work which is relatively difficult to form can be formed into a desired shape. That is, since the processing conditions can be changed in accordance with the material and the thickness of the work to be pressed, optimal press processing can be expected.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a mold.

FIG. 2 is an explanatory view showing a vertical movement of a slide.

[Description of References] 1 is an upper plate, 2 is a lower plate, 3 is a punch, 4 is a stripper, 5
Is a spring, 6 is a work, 7 is a die, 8 is a knockout plate,
9 is a spring, 10 is a heater, 11 is a stopper bolt, 12
Is a stopper bolt.

Claims (2)

[Claims] A press machine capable of numerically controlling the up-and-down movement of a slide, temporarily stopping the up-and-down movement of the slide, heating the work with a mold during this time, and thereafter molding the work with the mold. A press working device, characterized in that: 2. The press working apparatus according to claim 1, wherein a material of the work is a magnesium alloy.