JPS5973129A - Press drawing method in multiple direction - Google Patents

Abstract

PURPOSE:To improve the flow of a blank material and to economize the number of stages and man-hour by drawing the blank material which is pressed between a die and a blank holder while energizing the flange part thereof in the direction opposing to the angle of a square cylindrical part to be formed. CONSTITUTION:A blank material is supplied on the top surface of a punch 2 where a blank holder 3 energized by a cushion pin 4 is moved upward. The blank material is placed in the home position with the chamfered part of said blank material held coincident with the stroke direction of a push plate 10 fixed to a piston 9. A die 5 descends to press the blank material between the same and the blank holder 3 and a fluid pressure is supplied to the port 11 of a piston 8. A piston 9 advances and a push plate 10 fixed to the piston rod presses the chamfered part of the blank material. When the die 5 descend further, the die 5, the punch 2 and the holder 3 operate cooperatively to progress square cylindrical drawing and the flange part 14 of the blank material is pressed toward the angle part of the square cylindrical part, whereby the flow of the blank material in the wall part of the square cylinder is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multidirectional pressure drawing method suitable for deep drawing a square tube of a plate material.

Conventionally, when forming a rectangular cylindrical container from plate material, the method shown in Fig. 1 (a
) The material (6) shown in (C) was subjected to drawing process 9 using the device shown in (C). Zunawaji, as shown in figure (C), a punch (2) with a square cross section is installed upright on the lower mold (1), a plate holder (3) is provided on the outer periphery of the punch (2) so as to be able to rise and fall freely, and it is used as a cushion. Push the pin (4) upward with the required force and punch (
2) and the plate holder (3), the die (5) having a rectangular hole provided in the upper mold, the punch (2) and the plate holder (3) work together. deep drawing of a square tube.
(1)) A processed product (7) of a rectangular cylindrical container as shown in the figure was manufactured. However, in this processing method, the flow of the material from the flange part (14) to the rectangular cylinder wall part (13) r is poor due to the fins of the square cylinder wall part (131), and the drawing force increases. , □The twill depth is limited, and it takes many hours to complete the product, resulting in an increase in the number of molds.

',JThe object of the present invention is to eliminate this drawback and to
1. It is possible to improve the flow of material from the flange part to the square tube wall, especially the corner of the square tube, and to significantly reduce the squeezing force.
It is an object of the present invention to provide a multidirectional pressure drawing method that allows deep drawing. Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1(a) and 1(b), the material (6) used for drawing the processed product (7), which is a rectangular cylindrical container, is a rectangular plate with chamfered parts (15) at its corners. FIGS. 2 and 3, in which a press machine is normally provided, show a processing state using an upper die fixed to a slide of a press machine or the like and a lower die fixed to a bolster. A punch (2) having a square cross section is erected and driven by the lower die (1). On the outer periphery of the punch (2),
A temporary presser foot (3) is installed on the cushion pin (4), which can be raised and lowered freely, and is urged upward with the required force. It is equal to or slightly higher than the upper surface of 2+.
A die (5) facing the chip (2) is provided. The bottom surface of the die (j5.
) or the flange part (141) of the processed product '73, and the square hole provided in the center of 1 is a punch (2).
It has the role of drawing the rectangular tube wall (13) in cooperation with.

On the outside of the die (5), a plurality of cylinders (8) (four in the case of the embodiment) are provided horizontally toward the center of the die (5). A piston (9) fits into the cylinder (8),
Bush plate fixed to the piston rod 00)
is in a position where its surface slides along the bottom surface of the die (5) -
It is made to come. The thickness of the bushing plate (I0) is slightly thinner than that of the material (6).
) When pressing the material (6) between the Yoshi temporary press (3), the material (6) enters between the die (5) and the temporary press (3), and the material (6)
It has the role of pressing the chamfered portion (15) of the. The direction in which the bushing plate (10) presses the chamfered portion (+51) is toward the corner of the rectangular tube formed by the punch (2) and die (5). (Figure 3) 8) is provided with boats (I2) and alternately supplies fluid pressure to stroke the piston (9). The piston (9) is prevented from rotating, and the piston (9) is prevented from rotating.
The top surface is always aligned with the bottom surface of the die (5).

4. Next, we will discuss the effect. In FIGS. 2 to 5, the temporary presser foot (3) is held up to the upper surface of the punch (2) by the cushion pin (
The material (6) is supplied to the upper surface which is being raised by the force of the material (6).

The material (6) is placed in a fixed position with the chamfered portion (15) aligned with the stroke direction of the bushing plate (1o) fixed to the piston (9). The die (5) descends and presses the material (6) between the temporary presser foot (3) and the fifth die.
In the state shown in the figure, fluid pressure is supplied to the port a1) of the piston (8), and the fluid pressure that was previously supplied from the bow 1- (12) is discharged.

The piston (9) moves forward, and the push plate ao, which is fixed to the piston rod, presses the chamfered part (151) of the material (6J).If the die (5) is further lowered in this state, the die surface and The punch (2) and temporary presser (3) work together to advance the rectangular cylinder drawing process.During this progress, the bushing plate (1)
The flange part a (a) of the material (6) pressed into the square tube wall part (I3) is pushed into the corner of the square tube part with j clause, 'j, ), and the material is pushed into the square tube wall part (I3). Improve the flow. In a rectangular cylinder aperture, the material flows well in the constriction of the corner of the rectangular cylinder, where the drawing resistance is greatest.

According to actual results, when deep drawing square tubes of thick plates, the drawing depth is 30 ~
It showed a remarkable effect of reducing the coefficient by 40 (in rectangles and squares). The drawing force can be reduced and the drawing depth can be increased by optimally adjusting the pressing force of the plate holder (9) and the urging force of the push plate 00) according to the thickness and external dimensions of the material (6). As is clear from the above description, according to the present invention, it is possible to direct the flow of material toward the constriction of the corner where the drawing resistance is greatest in a rectangular tube drawing, and the drawing force can be significantly reduced. Since the drawing depth can be increased, the number of steps to complete the processed product can be reduced, and the number of molds required and the man-hours for manufacturing them can be saved, which has extremely great practical effects and advantages.

[Brief explanation of drawings]

Fig. 1 (Fig. 81 is a plan view of the material, Fig. (1)) is a diagram of a tilting machine of the processed product, Fig. (C) is a vertical cross-sectional view showing a conventional example, and Fig. 2 is a vertical cross-sectional view showing an embodiment. , Figure 3 is a sectional view taken along line III-II in Figure 2, Figures 4 and 5.
The figure is a longitudinal sectional view showing the state before processing. ■ is the lower die, 2 is the punch, 3 is the plate holder, 4 is the cushion pin, 5 is the die, 6 is the material, 7 is the processed product, 8 is the cylinder,
9 is a piston, 1o is a bushing plate, 11 is a boat, 12 is a boat, 13 is a square cylinder wall part, 14 is a flange part,
15 is a chamfered portion. Patent applicant Makoto Ishizaka, Director of the Agency of Industrial Science and Technology, Ministry of International Trade and Industry - Figure 4 Figure 5

Claims (1)

[Claims] The material is supplied onto a punch installed vertically in the lower mold and a plate holder which can be raised and lowered on the outer periphery of the punch and is biased upward by a cushion pin, and the die, the punch and the plate provided in the upper mold are supplied. In press working in which the material is squeezed into a rectangular cylindrical container by the cooperation of a presser foot, a plurality of cylinder devices are provided that move up and down together with the die and are oriented horizontally to the center on the outside near the lower end of the die. The flange portion of the material, which is pressed between the die and the plate holder by a '+1iit' sheet plate fixed to the piston rond of the device, is pressed from the direction opposite to the corner of the rectangular tube portion to be formed while being pressed into the drawing tool. A multidirectional pressure drawing method characterized by: