JPS5858940A - Press ironing die device - Google Patents

Abstract

PURPOSE:To perform correct centering, to prevent deformation of die due to working pressure and to perform ironing at high accuracy in ironing a cylindrical work, by fitting an annular die to outer periphery of a punch and die. CONSTITUTION:A cylindrical work A drawn by a separate press is set on a blank holder 14 to cover the upper end of a punch 13. When the ram of the press is lowered, a knock-out member 6 comes into contact with the cylindrical work A and pushes down to fit it to the punch 13. Just before completion of pushing down, a cylindrical part 20 of the second die 19 starts to fit to the first die 18. When the cylindrical work A is pushed down until it completely fits to the punch 13, a die 5 goes down ironing the outer peripheral wall of the cylindrical work A. By this ironing, the thickness of outer peripheral wall of the cylindrical work A is reduced, and finished to a specified outer diameter which is smaller than an original diameter. At the same time, the degree of drawing becomes greater and attains a specified drawing height.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a press ironing machine for ironing a cylindrical workpiece by the cooperative action of a punch and a die.

This type of press ironing M device uses the outer circumference N of the cylindrical workpiece!
So-called finishing is used for aperture, such as by increasing I, the dimensional accuracy on the outer diameter is achieved, and the aperture is increased to obtain a predetermined aperture height i5. however,
With the conventional Jinnotane 11 device, the finish accuracy deteriorates due to the expansion and deformation of the die due to the processing pressure when the press machine itself warps. It was said that ironing was difficult with the general-purpose Pre-7, which lacked proper consideration.

Therefore, an object of the present invention is to enable ironing to be performed using a general general-purpose press, and to be able to accurately align the punch and die during processing even if there is play in the press. Press ironing that prevents the die from expanding and deforming due to pressure and allows processing with high precision! We are in the process of providing equipment.

An embodiment of the present invention will be explained below based on t-FiJ. In Figure 1, 1 is a plate 3t attached to the ram 2 of the press.
- A gouly holder attached through the hole, with a die hole 4t having an inner diameter smaller than the outer diameter of the cylindrical workpiece ▲ facing downward.
- the dice 5 are fixed; 6 is the die holder
A knockout member 1 is held movably up and down, and a hairpin 7 is connected to the upper part of the knockout member by a screw.When the knockout member 6Fiom 2 is at the highest position in FIG. It is inserted inside.

8 is a stopper against which the hairpin 7 comes into contact. In addition, an air vent hole 6a is formed in the knockout member 6 in order to cope with the case where air is trapped in the die hole 4 during the ironing process, and air is released from the threaded gap of the threaded part connecting with the hairpin 7. There is.

-10,000, 9 is two plates 11.1 on the press stand 10
The punch holder is attached via a punch holder 2, and a punch 13 having approximately the same outer diameter as the inner diameter of the cylindrical workpiece is fixed to the upper surface of the punch holder. 14t! A pin 15 is fitted on the outside of the punch 13 so as to be movable up and down, and a guide pin 15 is connected to the outer periphery of the lower surface with a screw, and this guide pin 15t is fitted into a hole 9a formed in the punch holder 9. It is inserted into and supported by a bearing 16. Then, the compression spring 17 wound around the guide bin 15 causes the
The roller 14 is urged upward. Note that the punch 15 and punch holder 9 have holes 1s to vent air inside the cylindrical workpiece.
m, 9m are formed continuously. Reference numeral 18 denotes a ring-shaped first mold body having a hole 1811t'' in the center, which is fitted onto the outer periphery of the punch 13 by press-fitting the lower end large diameter portion 13bt of the punch 13 into the hole 18a. , is fixed to the punch holder 9 together with the punch 13. Also, 19 is a ring-shaped second shoe body having a hole 19at in the center.

This is fitted onto the outer periphery of the die 5 by press-fitting the die 5t into the hole 19a, and is fixed to the die holder 1 together with the die 5. A fitting cylinder part 20 that fits on the outside of the first mold body 18 is integrally provided on the lower surface of the second mold body 19, and the inner diameter of the seventh fitting cylinder part 20 is the same as that of the second mold body 18. The second mold body 1 is set slightly larger than the outer diameter of the second mold body 1.
9 is fitted into the second mold body 18 through a slidable minute gap.

Next, to explain the operation of the above structure, the nine-cylindrical workpiece is drawn and formed using another press, and the punch 15 is used as shown in No. 1111.
Set it on the Pfunk holder 14 so that it can be placed on the top edge of the board. In this state, when ram 2 of the press is lowered, 1
As shown in Fig. 32, the knockout member 6 first comes into contact with the cylindrical workpiece and pushes it down so that it fits into the punch 13. The fitting cylinder portion 20 of the second mold body 19 begins to fit into the first mold body 18 (
(See Fig. 3), the arm 2 continues to descend under the fitted state of the two molded bodies 18 and 19, until the cylindrical workpiece is completely fitted into the punch 13. When pressed down until they match,
Thereafter, the die 5 descends while squeezing the outer wall of the cylindrical workpiece (see FIG. 4). Through this ironing, the thickness of the outer circumferential wall of the cylindrical workpiece is reduced, and the diameter is reduced to a predetermined diameter smaller than the thick diameter, and the degree of drawing is increased.
The predetermined drawing height is achieved.

The above-mentioned ironing process is performed with the fitting cylinder 11ts2D of the second mold body 19 fitted with the first mold body 18, so that the movable side of the two rams of the press and the punch holder 9 18.1 Even if there is play between the fixed side of the
9 prevents the die 5 from wobbling, and the die 5 and the punch 13 are accurately aligned. Moreover, since the die 5 is reinforced by the second body 19 fitted on the outside, it is hardly deformed in the spreading direction due to the processing pressure at the time of finishing, and the cylindrical workpiece t-S
It can be processed well.

After machining the cylindrical workpiece, the ram 2 rises, and along with this rise, the punch holder 14 acts to pull out the cylindrical workpiece from the punch 13 by the spring force of the compression spring 17. , the cylindrical workpiece moves upward while being fitted into the large die 4 of the die 5. Since the hairpin 7 comes into contact with the stopper 8 during the rise of the ram 2, the subsequent rise of the ram 2 causes the knocker member 6 to act on the cylindrical workpiece as if it were to poke the die hole 4. Everything returns to the state shown in Figure 1.

As is clear from the above explanation, the present invention v4 has a ring-shaped heavy body T-fitted on the outer periphery of the punch and die, respectively, so that the two bodies fit into each other through a small gap during ironing. Therefore, it is possible to accurately center the punch, die, and T-shaped body, and also prevent the die from expanding and deforming due to processing pressure. Even if used, the excellent effect that ironing can be performed with high precision is achieved.

[Brief explanation of the drawing]

Figure tn shows an embodiment of the present invention, where 1st vti is an overall vertical sectional view ifi, and Figures 2 to 4m are longitudinal sectional views of main parts shown in the order of steps. In the figure, 2 is a Tsum, 5 is a Dice, and 15 is a Punch. 18 and 19 are the first and second warm bodies and the 2CIFi fitting cylinder portions. Applicant Tokyo Shibaura Electric Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] 1. In a machine that repeatedly processes a cylindrical workpiece by cooperation between a punch and a die, a ring-shaped mounting body is fitted on the outer periphery of the punch and die, respectively, and during ironing, these two bodies are microscopically processed. A press ironing device characterized in that they fit into each other through a gap.