JPS625690B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a single cylinder deep drawing device.

First, the current state of single cylinder deep drawing will be explained.

The blank (material) has material anisotropy due to the manufacturing process, and the rolling direction and this rolling direction are 45
It is normal for the rankford value (hereinafter referred to as R value) to be different in the 90° and 90° directions. For this reason, when a circular blank 1 as shown in Fig. 1 is deep drawn into a cylinder 2 as shown in Fig. 2 using a die and a punch, ears 3 will occur in the remaining flange portion where the R value is large. At present, it is not possible to improve the critical deep drawing ratio, and it is necessary to cut the generated edges 3 in a subsequent process and take the trouble to process the edges.

Therefore, the present invention improves the critical deep drawing ratio by preventing the occurrence of ears in the remaining flange part during the deep drawing process of a circular blank, and also makes the thickness of the remaining flange part uniform so that the R value of the blank is small during forming. An object of the present invention is to provide a deep drawing device that can prevent the occurrence of wrinkles.

In order to solve the above problems, the present invention provides a die having a recess formed in the center, and a die corresponding to the recess,
A punch that can be raised and lowered, a wrinkle holding plate disposed around the punch, and a punch that is arranged at symmetrical positions around the circular blank held by the die and the wrinkle holding plate, and is capable of abutting against the circumferential surface of the blank. It is composed of a plurality of pushing plates, a cylinder device that can press the pushing plates toward the center of the blank, and a rotating device that rotates the cylinder device along the outer periphery of the blank. A cylinder device applies an external force to push the blank toward the center of the blank from a predetermined symmetrical position on the outer periphery via a push plate, and a rotating device rotates the cylinder device along the outer periphery of the blank to apply the external force. This deep drawing device is characterized by deep drawing a single tube using a die and a punch while moving the position along the outer periphery of a blank.This deep drawing device will be explained below based on the drawings.

FIGS. 3 and 4 show a deep drawing device according to an embodiment of the present invention, in which 4 is a fixed die, and a recess 5 is formed in the center. A punch 6 corresponds to the recess 5 and is driven up and down. Reference numeral 7 denotes a wrinkle pressing plate disposed outside the punch 6, which is driven up and down by cylinders 8 and 9. Reference numeral 10 denotes an annular rotating body surrounding the outer periphery of the die 4, which is rotatably supported by a holder 11 attached to the outer periphery of the die 4, and has an annular rotating drive rack 12 formed at the bottom. has been done. Reference numerals 13 and 14 denote a motor and a pinion arranged on the side of the die 4, and the pinion 14 meshes with the rack 12 to drive the rotating body 10. 1
5 is a circular blank; 16 and 17 are cylinders mounted at symmetrical positions on the rotating body 10, and each stem 18 moves in and out along the center direction of the die 4. 19 is a push plate attached to the tip of the stem 18.

The product is molded as follows.

During deep drawing with die 4, punch 6, and wrinkle presser plate 7, cylinder 1 is used depending on the material of the blank.
6 and 17 are pressurized to push the blank 15 toward the center via the push plates 19 and 19 with an external force F, and at the same time, the motor 13 is operated to rotate the rotating body 10 in the direction of arrow A. As a result, the blank 15 has an outer circumference 20
is deep-drawn while being sequentially pressed by external force F by rotationally moving push plates 19, 19. In other words, since deep drawing is performed while the external force F is moved along the outer periphery of the blank 15, even if the magnitude of the external force F is increased, a situation where only a part of the blank 15 is deformed is unlikely to occur, and deep drawing is performed. The selvage 3 that occurs during the process can be strongly pressed with the push plates 19, 19, and wrinkles will not occur in areas with a small R value, and the remaining flange portion can be kept perfectly round, so that the selvedge 3 after molding can be firmly pressed. This eliminates the need for the cutting process of section 3.

Note that the rotating body 1 is used as a pushing device for the blank 15.
Two cylinders 16 and 17, etc. were provided at symmetrical positions of 0, and the blank 15 was deep drawn to maintain balance front to back and left and right, and to prevent the blank 15 from shifting from the set state. The same effect can be obtained even if the above-mentioned cylinders are arranged on the rotating body 10 at symmetrical positions along the circumference of the blank 15.

Further, this deep drawing method is effective not only for drawing a single cylinder but also for drawing a square cylinder.
In drawing a rectangular single cylinder, the drawing resistance is particularly large at the four corners and the drawing tends to remain, so conventionally the amount of deep drawing cannot be increased, but according to the present invention, while pushing towards the center with the push plates 19, 19 Because it is molded, the corners can be easily deformed,
The amount of deep drawing can be increased compared to the conventional method.

As described above, according to the present invention, a circular blank is pushed from a symmetrical position on its outer periphery by a cylinder device toward the center of the blank via a push plate, and the cylinder device is rotated to move the pushing tube into the blank. Since drawing can be performed while moving along the outer periphery, deep drawing can be performed while keeping the remaining flange part of the circular blank perfectly circular, there is no need to cut the edges in the later process, and the blank can be drawn in the direction of the center. Since forming is performed while applying a pushing force of
Further, since the pressing force and pressing distance can be set arbitrarily by adjusting the cylinder device, circular blanks having different materials and different diameters can be handled.

[Brief explanation of the drawing]

Figures 1 a and b are a plan view and a side view of a blank, Figures 2 a and b are a plan view and a vertical sectional view of a deep-drawn product, and Figures 3 and 4 are an implementation of the deep-drawing apparatus of the present invention. As an example, FIG. 3 is a longitudinal sectional view of a deep drawing device, and FIG. 4 is a plan view of the main part of FIG. 3. 4...Dice, 6...Punch, 10...Rotating body, 11...Holder, 12...Rack, 13...
...Motor, 14...Pinion, 15...Blank, 16, 17...Cylinder, 18...Stem,
19...Push board.

Claims (1)

[Claims] 1. A die with a recess formed in the center, a punch that corresponds to the recess and is movable up and down, a wrinkle holding plate placed around the punch, and a circular shape held between the die and the wrinkle holding plate. a plurality of pushing plates arranged at symmetrical positions around the blank and capable of coming into contact with the circumferential surface of the blank; a cylinder device capable of pushing the pushing plates toward the center of the blank; A deep drawing device equipped with a rotating device.