JPS6315046B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simultaneous hot drawing and stretch forming apparatus which is particularly suitable for use in top and bottom drawing of extremely thin plate materials.

The existing upper and lower drawing machines are single-function type, and have disadvantages in that several steps are required to complete the process, and the finished product is often prone to scratches and wrinkles.

An object of the present invention is to eliminate the drawbacks of the above-mentioned conventional techniques, to shorten the process, and to provide a hot drawing and stretching simultaneous forming apparatus that eliminates the occurrence of scratches and wrinkles.

In particular, when performing upper and lower drawing on ultra-thin sheet materials, the drawing die is equipped with a hot stretching function to perform drawing and stretching at the same time, thereby shortening the process and eliminating scratches and wrinkles on the final product. This is how it was done.

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing the shape of a final product obtained by drawing a single ultra-thin plate material from top to bottom.

FIG. 2 is a sectional view showing an embodiment of the present invention. In the figure, U indicates an upper mold and L indicates a lower mold.
The overall structure includes a drawing punch 1 having an outer drawing-shaped part slope 1a and an overhanging part slope 1b, a drawing die 2 having an outer drawing-shaped part slope 2a, an outer pressing plate 3, and an inner pressing plate 4 having an air blowing hole 8. , intermediate presser pin 5, push-out pins 6, 7
and a heater 10.

When the upper mold U, which can be moved vertically, is lowered by a pressing press (not shown), the drawing die 2 of the lower mold L heated by the heater 10 and the presser plate 3 of the upper mold U press the workpiece (not shown). When the upper die U is pressed down and further lowered, the presser plates 3 and 4 sink against the elastic force of the spring, and the drawing punch 1 of the upper die sticks out, forming the outer drawing shape slope 1a and the drawing shape of the drawing die 2. The outer portion is drawn by the inclined surface 2a, and the inclined surfaces 1a, 2a and the presser plate 4 descend until they come into contact with each other, and the drawing is completed. When the upper mold U is further lowered to the bottom dead center, the intermediate presser pin 5 is pushed up by the push-out pins 6 and 7, and a cavity S is formed in the middle as shown in FIG.

Next, air heated by the lower die U is injected into the workpiece after the drawing process through the air blowing hole 8 provided in the center of the inner presser plate 4, and the workpiece is drawn along the shape of the upper die cavity surface. An overhang process is performed to complete the final shape as shown in FIG.

According to this embodiment, it is possible to shorten the process of drawing the upper and lower parts, and it is also effective in preventing the occurrence of scratches and wrinkles.

According to the present invention, it is now possible to simultaneously perform hot elongation processing when performing upper and lower drawing processing on ultra-thin members, which has the effect of shortening the process and further preventing the occurrence of scratches and wrinkles in the final product. .

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the shape of the final product obtained by drawing the upper and lower parts, Fig. 2 is a sectional view showing an embodiment of the present invention, and Fig. 3 is the upper and lower molds shown in Fig. 2, both molds. FIG. 3 is a cross-sectional view showing a state in which overhanging processing is performed. Description of symbols, 1...Drawing punch, 2...Drawing die, 4...Inner pressing plate, 8...Air blowing hole, 10...Heater, 1a...Outer drawing shape part slope, 1b...Protruding shape part slope.

Claims (1)

[Claims] 1. An upper die having at least a drawing punch having a first slope for drawing on the outside and a second slope for projecting on the inside thereof, and a pin member provided at the center of the punch. a drawing die in which a third slope for drawing that is to be engaged with the first slope is formed in a mortar shape, and a fluid blowout hole is disposed at the bottom of the mortar shape as the center part of the die. a lower mold having at least a perforated plate member, and means for heating the lower mold, and a workpiece is sandwiched between the upper mold and the heated lower mold. By fitting the molds, the workpiece is drawn by the first slope of the drawing punch and the third slope of the drawing die, and then the fluid is blown out from the fluid blowing hole of the plate member. . A hot drawing and stretching simultaneous forming apparatus, characterized in that the workpiece is stretched along the second slope of the drawing punch and the bottom surface of the pin member.