JPH0253142B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a deep hole punching press, and particularly to a press that continuously performs the bottom part of deep hole extrusion molding and punching.

[Prior Art] In many cases, relatively deep and long cylindrical parts are press-formed.

In such press processing, the thickness of the material is the same as the hole diameter.
It is possible to perform punching after backward extrusion up to about 1.0 to 1.5 times, but if this limit is exceeded, buckling deformation and breakage of the punch will occur due to material mechanics. Therefore, in the case of a deep cylindrical part that exceeds this limit, the first
A method was used in which a deep, bottomed cylindrical shape was formed by extrusion molding at the rear of the process, and the bottom was punched out in the subsequent second step as shown in Figure B.

[Problems to be Solved by the Invention] In the conventional method using two steps as described above, since the processing is discontinuous, the production efficiency naturally decreases and the high speed requirement cannot be satisfied. Furthermore, providing a stage for each process or using a separate press for each process is disadvantageous in terms of equipment economy. Moreover, the second
Since the hole diameter d that can be punched in the step is slightly smaller than the hole diameter D formed in the first step, a stepped portion S is generated. For this reason, it is necessary to remove the stepped portion S, which increases the number of personnel and man-hours, and this also impairs productivity. Furthermore, it becomes difficult to guarantee the quality of high precision and uniformity.

Here, the object of the present invention is to enable continuous extrusion molding of a deep-hole cylindrical shape from the rear and punching of the bottom part with one action of a single punch, and to produce high-quality products with simple equipment and low cost. The objective is to provide a deep hole punching press that can perform high-speed processing.

[Means for Solving the Problems] The present invention uses the die itself as a reference, and aligns the axis of the through hole to be drilled with the bush that regulates the axis of the punch and the axis of the punch, and also creates a discharge path for the punched piece. The punch is equipped with a ring die for forming the punch, and is formed so that backward extrusion of a deep bottomed cylindrical shape and punching of the bottom can be performed continuously and in one operation while shortening the effective free length of the punch and preventing buckling deformation. It is.

That is, the annular part is fitted into the upper hole of the die, and the bush for regulating the axis of the punch is slidably fitted onto the punch for rear extrusion molding, and the central part is fitted with the tip of the punch. The head of a ring die, which has a through hole and forms a discharge path for the punched pieces, is fitted into the lower part of the die, and the bush is slid down and the ring part is fitted into the upper hole of the die. A lowering means is formed to allow vertical relative movement between the punch and the bush after extrusion molding, and a raising means is provided for removing the bush from the upper hole of the die and lifting it upward to a predetermined position after extrusion molding and punching. In cooperation with the ring die, the buckling deformation of the punch is prevented, and the axes of the punch and the through hole are kept aligned, while the rear extrusion molding of the deep bottomed cylinder shape and the punching of the bottom are performed in one single punch movement. It is characterized by being configured so that it can be performed continuously.

[Operation] In the present invention, the lowering means lowers the bush toward the die as the slide lowers. Then,
The annular portion of the bush fits into the upper hole of the die and regulates the axis of the punch with the die as a reference. moreover,
When the slide descends, the punch rearwardly extrudes the material in the die into the shape of a deep cylinder with a bottom, while its axis is regulated by the bush. Subsequently, the punch punches through the bottom. At this time, since the head of the ring die is fitted into the lower part of the die, the position of the through hole is regulated based on the die itself, and the tip of the punch and the through hole are compatible as they have the same diameter. Because of this, deep holes can be punched without any steps. Also,
Since the free length of the punch is short, buckling deformation does not occur.
The punched piece falls through the through hole of the ring die. Thereafter, the bush is separated from the die by the lifting means and lifted upward to a fixed position. Subsequently, the deep cylindrical product is knocked out upwardly from the die.

[Embodiment] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view of the main part. However, with the line segment Y equal to the punch 1 axis as the border, the left half shows the case where the punch 1 is at the upper limit, and the right half shows the case where the bottom part 1
The illustration is simplified to show the state immediately after punching 6B.

Here, the press consisting of the punch 1, die 10, etc. has a bush 4 that regulates and guides the axis Y of the punch 1 with the die 10 as a reference, and a central axis of the through hole 8p as a punched hole with the die 10 as a reference. Axis Y
A ring die 8 is provided for matching the punching piece 16B and discharging the punched piece 16B downward, and a lowering means 30 and a raising means 40 for raising and lowering the bush 4 in conjunction with the vertical movement of the slide 20, that is, the punch 1, are provided. Under the cooperation of the bush 4 and the ring die 8, a single action of the single punch 1 performs continuous backward extrusion forming of a deep bottomed cylindrical shape and punching of the bottom part 16B (shown as after punching in Fig. 1). It is configured so that it can be done.

First, the press configuration will be explained. The punch 1 is attached to a slide (upper mold part) 20 via a holder 2 and a punch plate 3, and is moved up and down together with the slide 20. This punch 1 is for backward extrusion, and has a relief portion formed above the tip portion 1F. On the other hand, the die 10 is fixed to a die plate (lower mold part) 15 via an anvil 9, and in addition to a hole 10H that regulates the outer diameter of the product 17, an upper hole 10U having a larger diameter is provided. . Reference numeral 12 denotes a knockout device which knocks out the product 17 in the die 10 upward through the pin 7 and a ring die 18, the details of which will be described later. Note that 11 is a scrap shoot.

Here, the bush 4, which is one of the characteristic components constituting the present invention, regulates and guides the axis Y of the punch 1 with the die 10 as a reference, as described above, and shortens the substantial free length of the punch 1. This makes it possible to punch out the bottom portion 16B of the deep bottomed cylinder. The bush 4 has an annular portion 4L that can be fitted into the upper hole 10U of the die 10, and is slidably fitted into the punch 1 as a whole. The inner diameter of the guide surface 4G is approximately equal to the outer diameter of the punch 1, and the inner diameter of the annular portion 4L is approximately equal to the outer diameter of the punch 1.
The diameter of I is equal to the diameter of the die hole 10H (product outer diameter), and the diameter of the outer surface 40 is equal to the inner diameter of the inner surface 10I of the upper hole 10U. Therefore, the buckling deformation force of the punch 1 is received by the die 10 via the bush 4, so that the axis Y of the punch 1 is regulated by the guide surface 4G and buckling deformation and breakage are prevented.

On the other hand, the ring die 8 is the material 16 (product 17).
is held in the die 10, and has a through hole 8p for a punched hole formed in the bottom 16B of the material 16 (shown as a punched piece in FIG. 1). This through hole 8p also functions as a fall path for the punched piece, similar to the hollow discharge path 8e. Specifically, head 8
h is fitted into the lower part of the die 10 (die hole 10H), and the outer diameter of the ring die 8 is the same diameter as the die hole 10H.

Therefore, it is understood that when the punch 1 is lowered, the tip end 1F is formed to fit in the through hole 8p with the same axis.

Next, the lowering means 30 is formed of a cylinder device consisting of a cylinder 18 and a piston 19 fixed to the slide 20, and a stripper plate 5 supporting the bush 4, and lowers the bush 4 together with the slide 20, and lowers the bush 4 around the circle. After the ring part 4L is fitted into the upper hole 10U of the die 10, the punch 1 and the bush 4
It is formed to allow relative movement in the vertical direction. In other words, the die 10 (die hole 10H )
It is a means for fitting with. In addition, punch 1
From the viewpoint of maintaining the axis Y of the strip plate 5.
The guide rod 13 on the side is slidably guided through the bush 6.

On the other hand, the raising means 40
When the raising or lowering means 30 of is released,
It is a means for releasing the bush 4 from the die 10 (die hole 10H) and releasing it to a fixed position upward for knocking out the product 17, and it is a means for releasing the bush 4 from the die 10 (die hole 10H) to a fixed position above, and is a means for knocking out the product 17. It is formed from a spring 14 interposed therebetween.

Next, the effect will be explained.

The material 16 is supplied to the die 10 in a state as shown on the left side with respect to the axis Y in FIG. Then, when the slide 20 (punch 1) is lowered, the cylinder devices 18 and 19, which descend together with the slide 20, lower the stripper plate 5 along the guide rod 13 against the biasing force of the spring 14. Therefore, Butsuyu 4 is Punch 1
At the same time, the annular portion 4L descends until it fits into the upper hole 10U of the die 10. Further, when the punch 1 descends, the vertical relative movement permitting function of the lifting means 30, 18, and 19 causes the bush 4 and the punch 1 to move downward.
It moves relative to the vertical direction. Then punch 1
Under the cooperation of the bush 4 and the ring die 8, the material 16 is extruded backward in the die 10 to form it into a deep cylindrical shape with a bottom. At this time, since the punch 1 is guided to the die 10 itself via the bush 4, the buckling deformation force is prevented and the punch 1 descends along the axis Y. The inner diameter of the semi-finished product in the shape of a cylinder with a bottom is equal to the outer diameter of the punch tip 1F, and the outer diameter of the semi-finished product is equal to the diameter of the die hole 10H.
The desired dimensions are regulated by the inner diameter of In this case, the material 16 is received by the head annular portion of the ring die 8 . Since it is backward extrusion molding, the material 16 does not protrude significantly into the through hole 8p. punch 1
continues to decline.

Since the ring die 8 is fitted into the lower part of the die 10 and the axis Y of the punch 1 is held by the bush 4, the tip 1F of the punch 1 enters the through hole 8p concentrically. Therefore, the bottom part 1 of the semi-finished product
6B is continuously punched out in one operation to have an outer diameter equal to the outer diameter of the tip portion 1F, thereby making it possible to obtain a product 17 in the shape of a deep-hole cylinder with no steps.

Thereafter, when the slide 20 is raised, the bush 4 is raised to the upper position by the raising means 40. The product 17 is ejected above the die 10 by the knockout device 12.

According to this embodiment, the punch 1 has a short free length and a bush 4 that holds the axis Y with the die 10 as a reference, and a through hole 8p that matches the inner diameter of the die 10 and has the same diameter as the punched hole. A ring die 8 having a ring die 8 is inserted and arranged, and a slide 20 (punch 1)
Since the configuration includes a lowering means 30 and a raising means 40 for raising and lowering the bush 4 in conjunction with the vertical movement of the punch 1, the lowering means 30 and the raising means 40 are provided for raising and lowering the bush 4 in conjunction with the vertical movement of the punch 1. Since the backward extrusion molding of the deep bottomed cylindrical shape and the punching of the bottom part 16B can be performed continuously, high-speed processing is possible with simple equipment and low cost.

In addition, the bush 4 can be fitted into the upper hole 10U, and the ring die 8 is fitted into the die hole 10H, both of which are based on the die 10 itself, so the buckling deformation force is suppressed and the punch 1 and the penetrating It is concentric with the hole 8p and can be processed with high precision.

In addition, since the inner diameter 4I of the bush 4 and the inner diameter of the die hole 10H are the same, and the outer diameter of the tip 1F of the punch 1 and the diameter of the through hole 8p are the same, the outer diameter of the product as well as the punching The hole diameter is highly accurate and there are no steps, dramatically improving production efficiency.

Further, since the lowering means 30 is formed to lower the bush 4 together with the punch 1 and to allow relative movement in the vertical direction between the punch 1 and the bush 4 when fitted with the die 10, the bush 4 is lowered together with the punch 1.
can be held at a position where the free length of the punch 1 is the shortest.

In addition, since the bush 4 is placed in a fixed position by being inserted into the upper hole 10U of the die 10, it is possible to prevent the buckling deformation force of the punch 1 in the entire circumferential direction, and from this point as well, the axis Y can be maintained. It is possible to ensure stability over a long period of time.

Further, with this configuration, rear extrusion molding and punching of the bottom of the deep hole can be performed using a single punch 1 and die 10, making it possible to downsize the press and simplify its structure.

Furthermore, since the ring die 8 has a discharge portion 8e that continues from the through hole 8p, the punched piece 16B can be discharged smoothly and efficiently. At the same time, reliable operation and structural simplification of the knockout device 12 can be achieved.

[Effects of the Invention] As is clear from the above description, the present invention includes a bush for holding the axis of the punch with respect to the die, a ring die that makes the punch hole concentric with the axis of the punch, and a bush in conjunction with the lifting and lowering of the punch. Since the structure is equipped with a lowering/elevating means for raising and lowering, a single punch can continuously extrude the rear end of a deep bottomed cylinder shape and punch out the bottom part in one operation, increasing speed and eliminating steps. It is possible to provide a small, lightweight, and low-cost deep-hole punching press that can achieve high-precision press processing while reducing man-hours.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a diagram for explaining a conventional two-step method. 1... Punch, 4... Button, 4L... Annular part, 5... Stopper plate, 8... Ring die, 8p... Through hole, 8h... Head, 10... Die, 10U... Upper hole, 10I...Inner surface, 13...
...Guide rod, 14...Spring, 18...
Cylinder, 19... Piston, 20... Slide, 30... Lowering means, 40... Raising means.

Claims (1)

[Scope of Claims] 1. A bush for regulating the axis of the punch by fitting the annular part into the upper hole of the die is slidably fitted onto the punch for rear extrusion molding, and the bush is fitted in the center part of the punch. The head of a ring die, which has a through hole that matches the tip and forms a discharge path for the punched pieces, is fitted into the lower part of the die, and the bush is lowered with a slide so that the annular part of the die is inserted into the lower part of the die. A lowering means formed to allow vertical relative movement between the punch and the bush after fitting into the upper hole, and a rising means for removing the bush from the upper hole of the die and lifting it upward to a predetermined position after extrusion molding/punching. By working together with the bush and the ring die, the punch can be prevented from buckling and deformed, and the axes of the punch and the through hole can be aligned and maintained, while the rear extrusion molding of the deep bottomed cylinder shape and the punching of the bottom part can be performed. A deep hole punching press characterized by being configured so that it can be performed continuously with a single punch operation.