JPH09150223A - Plastic-working method for cupped member with boss - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a member having desired shape and size at one process without causing the tension stress in the vertical wall of a boss part by pressing the opening and surface of a cupped member and forming the boss part. SOLUTION: When a pressing punch and a ring punch 4 descend, a plate-like blank is squeezed by a die and the pressing punch to form the cupped shape. When the ring punch 4 further descends in the condition of holding the flange part of the cupped member with the holding punch and a counter punch 8, the opening end surface 13 of the cupped member is pushed by the ring punch 4, and the bottom part of the cupped member is erected toward the inside of the cupped member along the projecting part 12 of the counter punch 8. By this method, a large scaled equipment is obviated and a trouble of shock line caused in the case of multiple processes is cancelled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic working method for a cup-shaped member with a boss, and belongs to the technical field of a so-called plastic working method in which a general steel plate is drawn to obtain a cup-shaped member. .

[0002]

2. Description of the Related Art Conventionally, in order to obtain such a member,
As shown in FIG. 9, the plate-shaped material 1 was gradually drawn to form a boss having a required shape and dimensions, and then the outer peripheral portion of the semi-processed product was raised to form a final member.

According to this conventional method, many steps are required to obtain the necessary boss. For example, plate material 1
Let D1 be the outer diameter of D1 and D2 be the diameter of the boss, and D1 ÷ D2 = 5
In the case of, the number of steps is from 4 to 6. If an attempt is made to form a boss having a necessary size all at once, the tensile stress of the vertical wall portion of the boss portion increases and this portion is broken. Therefore, the number of steps as described above is required.

Therefore, according to the conventional method, firstly, a large-scale device such as a transfer press and a large number of molds are required.

Second, a series of corner corners R shown in FIG.
Since a shock line is generated in the flange portion A due to the influence of 1, R2, R3, etc., a so-called rest-like process is required to prevent this.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to obtain a boss having a required shape and size without increasing the tensile stress of the vertical wall of the boss portion. is there.

[0007]

[Means for Solving the Problems] In order not to generate tensile stress on the vertical wall of the boss, the boss is formed by pushing the end face of the opening of the cup-shaped member.

Alternatively, by inserting a pin into the boss portion, the boss portion may be pulled to a degree such that the pulling force of the vertical wall becomes smaller than the breaking force.
By pulling substantially, it helps shape the boss.

Further, by using the above means, a desired member is obtained by using a material which has been previously formed into a cup shape.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIG.
This will be described below with reference to FIGS. 2 and 3. A pressing punch 3 and a ring punch 4 are provided so as to reciprocate so as to face the die 2. A die hole 6 is formed in the die 2, and an approach portion 7 and a guide portion 10 are formed in the opening portion of the die hole 6. The die hole 6 is a hole for narrowing down the plate-shaped material 1 with the pressing punch 3, and the guide portion 10 restrains the outer periphery of the plate-shaped material 1 when setting the plate-shaped material 1 in the die 2. It is for positioning.

A counter punch 8 is inserted in the die 2, and the counter punch 8 is urged by an eject pin 9 and can be raised. The counter punch 8 cooperates with the pressing punch 3 to press the flange portion of the plate-shaped material 1 to prevent the flange portion from becoming thicker, and further cooperates with the eject pin 9 to complete molding. To eject.
The eject pin 9 has a structure operated by pressure oil.

The pressing punch 3 is urged by the cushion pin 5, and cooperates with the die 2 to squeeze the plate-shaped material 1 into a cup shape and prevent the flange portion from becoming thick as described above. The cushion pin 5 has a structure operated by pressure oil.

In FIG. 1, a plate-shaped material 1 is supplied to a die 2 and positioned by a guide portion 10. When the pressing punch 3 and the ring punch 4 descend, the plate-shaped material 1 is moved to the die 2
And a pressing punch 3 are used for drawing to form a cup shape as shown in FIG. In this state, that is, when the flange portion of the cup-shaped member is sandwiched between the pressing punch 3 and the counter punch 8, when the ring punch 4 is further lowered, the opening end surface 13 of the cup-shaped member is pushed by the ring punch 4. Then, the bottom of the cup-shaped member rises inside the cup-shaped member along the protrusion 12 of the counter punch 8 as shown in FIG.

The second embodiment will be described below with reference to FIGS. 4, 5 and 6. The second embodiment is different in that the pin 14 is inserted into the counter punch 8 in the first embodiment. The pin 14 assists the generation of the boss portion, and is inserted into the inner diameter portion of the boss portion thereafter, and assists the boss portion to grow by pushing up the boss portion. The pin 14 is urged by the urging pin 15 and can be raised. The biasing pin 15 has a structure that is operated by pressure oil.

In FIG. 4, the plate-shaped material 1 is supplied to the die 2 and positioned by the guide portion 10. When the pressing punch 3 and the ring punch 4 descend, the plate-shaped material 1 is drawn by the die 2 and the pressing punch 3 into a cup shape as shown in FIG. In this state, that is, when the flange portion of the cup-shaped member is sandwiched between the pressing punch 3 and the counter punch 8, the ring punch 4 is further lowered, and at the same time as the pin 14 is raised, the cup-shaped member is opened. The end face of the cup is pushed by the ring punch 4 and the bottom of the cup-shaped member is pushed up by the pin 14, and as a result, it rises up inside the cup-shaped member as shown in FIG.

As shown in FIG. 7, the third embodiment is a method for obtaining a desired member by using a preformed cup-shaped material. Regarding the molding of the boss portion, This is the same as the first or second embodiment.

Although the boss portion is formed inside the cup-shaped member in the above description of the embodiment, the boss portion is formed outside the cup-shaped member as shown in FIG. Anything is fine.

[0018]

According to the present invention, since the stress on the vertical wall portion of the boss portion does not increase, a member having a desired shape and dimension can be obtained in one step, and a large-scale equipment such as a transfer press can be obtained. Is unnecessary, and the problem of the shock line that occurs in the case of multiple processes is solved.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a mold showing a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a mold showing the first embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of a mold showing the first embodiment of the present invention.

FIG. 4 is a vertical sectional view of a mold showing a second embodiment of the present invention.

FIG. 5 is a vertical sectional view of a mold showing a second embodiment of the present invention.

FIG. 6 is a vertical sectional view of a mold showing a second embodiment of the present invention.

FIG. 7 is a vertical sectional view of a mold showing a third embodiment of the present invention.

FIG. 8 is a supplementary explanatory diagram showing an embodiment of the present invention.

FIG. 9 is an explanatory view showing a conventional processing step.

[Explanation of symbols]

1 is a plate material, 2 is a die, 3 is a pressing punch, 4 is a ring punch, 5 is a cushion pin, 6 is a die hole, 7 is an approach part, 8 is a counter punch, 9 is an eject pin, 10 is a guide part. , 11 is a hole, 12 is a protrusion, 13 is an end face of the opening of the cup-shaped member, 14 is a pin, and 15 is a biasing pin.

Claims (3)

[Claims] 1. A cup-shaped member is inserted into a die hole, fitted into an inner wall of the cup, and the bottom portion of the cup-shaped member is pressed by a pressing punch urged by a hydraulic cushion or the like on the die side. In a plastic working method of forming a boss portion inwardly or outwardly on a bottom portion of a cup-shaped member, a cup-shaped member is formed by pressing a bottom portion of the cup-shaped member with a pressing punch and a counter punch opposite to the pressing punch. A plastic working method for a cup-shaped member with a boss, characterized in that the boss portion is formed by pressing the end face of the opening of the member with a ring punch. 2. A cup-shaped member is inserted into the die hole, fitted into the inner wall of the cup, and the bottom portion of the cup-shaped member is pressed by a pressing punch urged by a hydraulic cushion or the like to the die side. In a plastic working method of forming a boss portion inwardly or outwardly on a bottom portion of a cup-shaped member, a cup-shaped member is formed by pressing a bottom portion of the cup-shaped member with a pressing punch and a counter punch opposite to the pressing punch. By pressing the opening end surface of the member with a ring punch and axially urging the pin having a diameter corresponding to the inner diameter of the boss, the tip of which is directed toward the bottom of the cup-shaped member,
A plastic working method of a cup-shaped member with a boss, characterized in that a boss portion is formed on the bottom of the cup-shaped member, and the cup-shaped member is molded to a desired shape and dimension. 3. A cup-shaped member formed in advance into a cup shape is used to draw a small-diameter cup member, or a plate-shaped material is used to draw-form the cup-shaped member, and then the bottom of the small-diameter cup member is formed. The plastic working method for a cup-shaped member with a boss according to claim 1 or 2, wherein the boss portion is formed toward the inside or the outside.