JPH0999337A - Press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press provided with a knock-out mechanism capable of rapidly separating a formed body from a die without damaging the formed body. SOLUTION: A first stopper 14 is provided between a ram side knock-out mechanism 13 and a bed 2 to keep the distance between a knock-out pin 6a of an upper die and a lower die 5 at the minimum value determined according to the shape of a formed body until a ram 4 is elevated to the prescribed height after it reaches the lowest position, and second stoppers 11b, 13b are provided between a bed side knock-out mechanism 11 and the ram side knock-out mechanism 13. The distance between the knock-out pin 5a of the lower die and the knock-out pin 6a of the upper die is regulated so that it is not smaller than the value determined according to the shape of the formed body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press working apparatus used for die forging, deep drawing and the like, and more particularly to a knockout mechanism for ejecting a finished molded product from a mold.

[0002]

2. Description of the Related Art Conventionally, as a knockout mechanism provided in the above-mentioned press working apparatus, there is a knockout mechanism in which a cylinder is driven by air pressure or hydraulic pressure, and thereby a knockout pin provided in a mold is ejected and operated. there were.

In such a knockout mechanism, the ejection speed of the knockout pin is controlled by adjusting the flow rate of fluid such as air or oil.

[0004]

However, in the above-described conventional knockout mechanism, it is extremely difficult to completely synchronize the ejecting speed of the knockout pin with the ascending speed of the ram. When the ejection speed is higher, there is a problem that the knockout pin is ejected and the molded product is damaged.

Further, when the knockout pin ejection speed is slower than the ram rising speed, the molded product may be lifted together with the ram in a state of being fitted in the movable mold. In such a case, the molded product is expensive. As a result of being pushed down from the position, it cannot be said that the molded product will not be damaged or the position of the molded product will not change, and especially in an automatic press line, the change of the falling position will prevent the molded product from being conveyed. However, there is a problem that the knockout mechanism in the conventional press working apparatus has a problem to solve these problems.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems in a conventional press working apparatus, and does not damage the molded product after processing, and also smoothly separates the molded product from the mold. It is an object of the present invention to provide a press working apparatus equipped with a knockout mechanism that can be used.

[0007]

A press working apparatus according to claim 1 of the present invention performs a press working between a movable die attached to a movable ram and a fixed die attached to a fixed bed. In the press machine, there is a stopper that keeps the distance between the movable mold knockout pin and fixed mold of the movable mold to a predetermined minimum dimension until the ram reaches the processing position and then retracts to the retracted position. The press machine according to claim 2 of the present invention is characterized in that the movable knockout pin is provided between the movable side knockout mechanism for ejecting and operating the bed and the bed. The distance between the fixed type knockout pin provided on the fixed type and the movable type is kept at a predetermined minimum value until the retracted position is reached. Wrapper has a feature that a has a configuration that is provided between the fixed-side knockout mechanism and ram actuating protrudes the fixed knockout pins,
Further, in the press working apparatus according to claim 3 of the present invention, in the same press working apparatus, a movable knockout pin and a fixed die provided in the movable die are provided until the ram reaches the working position and then retracts to the retracted position. A first stopper for holding the distance between the movable knockout pins at a predetermined minimum size is provided between the movable side knockout mechanism for ejecting the movable knockout pin and the bed, and the movable knockout pin and the fixed mold are provided. A second stopper for holding the minimum distance from the fixed knockout pin at a predetermined value is provided between the movable knockout mechanism and the fixed knockout mechanism for ejecting the fixed knockout pin. It is characterized by the fact that the structure of such a press working apparatus solves the conventional problems described above. It is the order of means.

[0008]

In the press working apparatus according to the first aspect of the present invention, the movable die is provided with the knockout pin, and the stopper is provided between the movable side knockout mechanism and the bed. Since the distance between the movable knockout pin and the fixed mold is maintained at a predetermined minimum dimension after reaching the processing position until it is retracted to the predetermined retracted position, the minimum dimension described above can be obtained. By setting the dimensions according to the shape of, the movable knockout pin will not be projected while the molded product is placed on the fixed mold.
The molded part is no longer damaged by the movable knockout pin. Also, since the above minimum size is maintained until the ram moves to the predetermined retracted position, the movable knockout pin is relatively projected from the movable mold at the same time when the ram starts to retract, and the molded product is fixed mold. In the above, it is separated from the movable mold, and the positional fluctuation due to dropping or the like is eliminated.

In the press working apparatus according to the second aspect of the present invention, the fixed die is provided with a knockout pin,
A stopper provided between the fixed side knockout mechanism and the ram allows the distance between the fixed type knockout pin and the movable type to be set in advance from the time when the ram reaches the processing position until it retracts to the predetermined retracted position. Since the minimum size is set according to the shape of the molded product, the fixed mold knockout pin is projected before the movable mold separates from the molded product. No damage to the molded product due to the fixed knockout pin. Further, since the minimum size is maintained until the ram moves to the predetermined retracted position, the fixed type knockout pin is projected from the fixed mold at the same time as the ram starts to retract, and the molded product is moved in the retracted direction of the movable mold. It will be separated from the fixed mold at the same time as it moves to.

Further, in the press working apparatus according to claim 3 of the present invention, knockout pins are provided on each of the movable die and the fixed die, and a first stopper is provided between the movable side knockout mechanism and the bed. With this first stopper, the distance between the movable knockout pin and the fixed mold can be maintained at a predetermined minimum dimension from the time when the ram reaches the processing position until it rises to the predetermined position. Therefore, like the device according to claim 1, the movable knockout pin is prevented from protruding while the molded product is placed on the fixed mold, and the molded product is damaged by the movable knockout pin. Is avoided. Also, since the above minimum size is maintained until the ram moves to the predetermined retracted position, the movable knockout pin is relatively projected from the movable mold at the same time when the ram starts to retract, and the molded product is fixed mold. As it is separated from the movable mold on the upper side, the positional fluctuation due to dropping or the like is prevented. Further, the second stopper provided between the fixed side knockout mechanism and the ram holds the minimum distance between the fixed knockout pin and the movable knockout pin at a predetermined value, that is, the fixed knockout pin and the movable knockout pin. The distance from the mold is regulated so that it does not become smaller than the value set according to the shape of the molded product, so the molded product will not get caught between the movable knockout pin and the fixed knockout pin, Damage to the molded product due to the protrusion of the knockout pins will also be avoided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the drawings.

1 to 4 are vertical sectional views for explaining the structure and operation of a forging press as one embodiment of the pressing device according to the present invention. FIG. 1 is a bottom view of the forging press device. The point, that is, the positional relationship between the forging die and the knockout pin at the time when the molding of the forged product is completed is shown.

That is, the forging press 1 shown in the figure has a housing composed of a bed 2 and a frame 3 which are integrally formed, and a ram 4 which is housed in the housing and moves up and down.
And the lower mold 5 (fixed mold) and the ram 4 mounted on the bed 3.
The ram 4 is mainly composed of a forging die including an upper die 6 (movable die) attached to the ram 4, and the ram 4 is mounted on the eccentric shaft portion 7a of the drive shaft 7 rotatably supported on the upper portion of the frame 3 by the arm 8 and the shaft. 9 is connected via a drive motor 7, and the rotary power of a drive motor (not shown) is transmitted to the drive shaft 7 to move up and down along the frame 3 of the housing.

The lower die 5 and the upper die 6 of the forging die are provided with a lower die knockout pin 5a (fixed knockout pin) and an upper die knockout pin 6a (movable knockout pin), respectively. The knock-out mechanism is composed of a knock-out cylinder and a knock-out bar, each of which is mounted on each of the No. 4 and No. 4 knock-out mechanisms.

That is, in the bed 2, the bed side knockout cylinders 10, 10 are embedded in the bottom left and right of the bed 2, and the knockout cylinders 10, 1 are also provided.
A bed side knockout bar 11 having a number of knockout rods 11a corresponding to the number of knockout pins is connected to the tip end side of the cylinder rod of 0, and the tip end of the knockout rod 11a is provided in the lower mold 5. The die knockout pin 5a is brought into contact with the base end portion of the die knockout pin 5a. Therefore, the knockout cylinders 10, 10
The lower die knockout pin 5a in the lower die 5 is adapted to be projected and retracted in the molding space of the forging die by the pushing and pulling operation of.

Further, ram side knockout cylinders 12, 12 are provided at the left and right positions of the ram 4, and a ram side knockout bar 13 having a knockout rod 13a is provided at the tip end side of the cylinder rods of the knockout cylinders 12, 12. Connected and knockout rod 13
Upper die knockout pin 6 with the tip of a provided in the upper die 6
The upper die knockout pin 6a in the upper die 6 is adapted to come into contact with the base end portion of a, and as in the case of the lower die knockout pin 5a, by the pushing and retracting operations of the knockout cylinders 12, 12. It is adapted to appear and disappear in the forming space of the forging die.

Further, the frame 3 formed integrally with the bed 2 is provided with first stoppers 14 and 14 at positions contacting the ram side knockout bar 13, so that the ram 4 reaches the bottom dead center. After that, until the ram 4 rises to a certain height, that is, the ram 4 is knocked out on the ram side
The absolute position of the ram side knockout bar 13 even if the ram side knockout bar 13 is pushed out until the ram side knockout bar 13 moves away from the first stoppers 14 and 14 until the ram side knockout bar 13 is lifted more than the pushing stroke. Is held so that the distance between the upper die knockout pin 6a and the lower die 5 does not become smaller than the minimum dimension predetermined according to the shape of the forged product F (see FIG. 4).

The bed-side knockout bar 11 and the ram-side knockout bar 13 are provided with bed-side stopper pins 11b, 11b and ram-side stopper pins 13b, 13b at their left and right positions, respectively. Stopper pins 11b, 13b
Function as a second stopper by abutting each other, and keep the distance between the bed side knockout bar 11 and the ram side knockout bar 13 constant, so that the lower mold knockout pin 5a and the upper mold knockout pin 6a are The distance is set so as not to become smaller than a predetermined value according to the shape of the forged product F.

The process in which the forged product F is discharged from the forging die when forged using the forging press 1 will be described below with reference to FIGS. 1 to 4. FIG.
(A) ~ (c) is an enlarged view of the mold part corresponding to each of FIGS. 1 to 3 showing the process in which the ram 4 sequentially rises from the bottom dead center. Along with this, a process in which the forged product F is sequentially ejected from the upper die 6 and the lower die 5 will be described.

FIGS. 1 and 4 (a) show a state in which the ram 4 has reached the bottom dead center, that is, a state in which forging has been completed,
At this point, the knockout pins 5a and 6a are in the lower mold 5,
It is retracted in 6. Then, at the same time when the ram 4 reaches the bottom dead center, the push-out operation of the bed-side and ram-side knockout cylinders 10 and 12 is started. The operating speed of the knockout cylinders 10 and 12 at this time is set to be higher than the rising speed of the ram 4.

As shown in FIG. 2, the ram 4 rises together with the upper die 6 due to the rotation of the drive shaft 7, but the ram side knockout bar 13 includes the ram side knockout cylinders 12, 1.
By the pushing force of 2, the first stoppers 14 and 14 attached to the bed 2 via the frame 3 are held while being pressed. That is, the first stopper 14,
The ram side knockout bar 13 and the upper mold knockout pin 6a connected to the knockout bar 13 via the knockout rod 13a are held at an absolute position, and only the upper mold 6 rises together with the ram 4, so that the relative movement is achieved. The upper die knockout pin 6a is projected from the upper die 6, and the forged product F is separated from the upper die 6, as shown in FIG.

At this time, since the distance between the upper die knockout pin 6a and the lower die 5 is set according to the shape of the forged product F, the upper die knockout pin 6a is projected beyond the size of the forged product F. The forged product F is not damaged by the knockout pin 6a.

Next, the drive shaft 7 is further rotated to move the ram 4 into the knock-out cylinders 12, 12 on the ram side.
When the ram side knockout bar 13 is raised beyond the pushing stroke of the first stopper 1 as shown in FIG.
4 and 14 and rises together with the ram 4, the bed is regulated by the bed-side stopper pin 11b and the ram-side stopper pin 13b, which are the second stoppers, despite the push-out operation of the bed-side knockout cylinders 10, 10. The ascending of the side knockout bar 11 is started, and the knockout pin 5a provided on the lower die 5 is caused to project by the knockout rod 11a.
As shown in (c), the forged product F is projected from the upper die 6.

At this time, the distance between the lower die knockout pin 5a and the upper die knockout pin 6a is regulated by the bed side stopper pin 11b and the ram side stopper pin 13b, and is preset according to the shape of the forged product F. Since it is not smaller than the value, the forged product F is not damaged by the knockout pins 5a and 6a. Further, since the forged product F is separated from the upper mold 6 at the same time that the upper mold 6 starts to rise together with the ram 4 before being ejected from the lower mold 5, the forged product F is not lifted together with the upper mold 6 and is forged. The protruding position of the product F becomes constant.

In the above-mentioned embodiment, the bed side and ram side stopper pins 11b and 13b, which are the second stoppers, are arranged outside the forging dies 5 and 6, but as shown in FIG. The pins 11b and 13b can also be provided in the mould. By bringing the stopper pins 11b and 13b into contact with each other, the lower and upper mold knockout pins 5a and 6a are formed.
The minimum distance between can be kept to the dimensions of the forging,
Similar to the above embodiment, both knockout pins 5a and 6
It is possible to prevent the forged product from being damaged by the protrusion of a.

Further, in the above embodiment, the forging press having the knockout mechanism in both the upper die and the lower die has been described, but in the press working apparatus according to the present invention, the upper die may be used depending on the shape of the molded product. Alternatively, the knockout mechanism can be provided only in the lower mold. In this case, naturally, the second stopper provided between the upper and lower mold knockout mechanisms is unnecessary.

Further, the present invention is not limited to the forging press,
The present invention can be applied to various press working apparatuses that require a knockout mechanism, such as press machines for drawing and stretch flange processing.

[0028]

As described above, according to the first aspect of the present invention.
The press working device according to the above is equipped with a knockout mechanism on the movable side, and is movable by the stopper provided between the movable side knockout mechanism and the bed until the ram retreats to the predetermined retracted position after reaching the processing position. Since the distance between the mold knockout pin and the fixed mold is kept to the minimum size that is predetermined according to the shape of the molded product,
The movable knockout pin does not protrude beyond the size of the molded product, and damage to the molded product can be prevented. Further, since the above minimum size is maintained until the ram retracts to the predetermined retracted position, the molded product is relatively ejected from the movable mold at the same time when the ram and the movable mold are retracted, and the protrusion position is prevented from fluctuating due to a fall or the like. It has an extremely excellent effect that it can be eliminated.

In the press working apparatus according to claim 2 of the present invention, the fixed side is provided with a knockout mechanism, and a stopper provided between the knockout mechanism and the ram causes a predetermined evacuation after the ram reaches the working position. Since the distance between the fixed type knockout pin and the movable type is kept at a minimum dimension that is predetermined according to the shape of the molded product until it is retracted to the position, it is the same as the device according to claim 1 above. Moreover, the fixed knockout pin does not protrude beyond the size of the molded product, and damage to the molded product can be prevented. Also, since the above minimum size is maintained until the ram retracts to the predetermined retracted position, the molded product should be ejected from the fixed mold at the same time when the ram and the movable mold start to retract, and the molded product should be separated from the fixed mold promptly. The excellent effect of being able to do is brought.

Further, in the press working apparatus according to claim 3 of the present invention, a knockout mechanism is provided on each of the movable side and the fixed side and the first stopper is provided between the movable side knockout mechanism and the bed. Are provided between the fixed side knockout mechanism and the ram, and the first stopper forms the distance between the movable knockout pin and the fixed mold from the time when the ram reaches the processing position to the time when the ram rises to the retracted position. In addition to keeping the minimum size predetermined according to the shape of the product, the second stopper keeps the minimum distance between the fixed mold knockout pin and the movable mold at a predetermined value according to the shape of the molded product. Therefore, similar to the device according to claim 1, damage to the molded product due to the movable knockout pin should be avoided. It is, the molded article can protrude quickly from the movable mold, it is possible to prevent fluctuations in extended position due to dropping or the like. Further, since the distance between the movable and fixed knockout pins does not become smaller than the dimension of the molded product, it is possible to prevent the damage of the molded product due to the protrusion of the knockout pins. Be done.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a structure of a forging press and a positional relationship at a bottom dead center thereof as an example of a press working apparatus according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a state in which the upper die is slightly elevated together with the ram in the forging press shown in FIG.

3 is a vertical cross-sectional view showing a state in which the upper die is further raised together with the ram in the forging press shown in FIG.

4 (a) is an enlarged view of a main part of the forging press shown in FIG. 1, and is a cross-sectional view showing a state of a forged product immediately after completion of forging. (B) It is a principal part enlarged view of the forging press corresponding to FIG. 2, and is a cross-sectional view showing a state in which the forged product is projected from the upper die. (C) It is a principal part enlarged view of the forging press corresponding to FIG. 3, and is a cross-sectional view showing a state in which the forged product is further projected from the lower die.

FIG. 5 is a cross-sectional view showing another structural example of the forging die used in the press working apparatus according to the present invention.

[Explanation of symbols]

1 Forging press (pressing machine) 2 Bed 4 Ram 5 Lower die (fixed die) 5a Lower die knockout pin (fixed knockout pin) 6 Upper die (movable die) 6a Upper die knockout pin (movable knockout pin) 11 Bed Side knockout bar (fixed side knockout mechanism) 11b Bed side stopper pin (second stopper) 13 Ram side knockout bar (movable side knockout mechanism) 13b Ram side stopper pin (second stopper) 14 First stopper

Claims (3)

[Claims] 1. A press working apparatus for performing press working between a movable die mounted on a movable ram and a fixed die mounted on a fixed bed, and then retracted to a retracted position after the ram reaches a machining position. Until then, a stopper for holding the distance between the movable knockout pin provided in the movable mold and the fixed mold at a predetermined minimum dimension pushes out the movable knockout pin and actuates the movable side knockout mechanism and the bed. A press working device characterized by being provided between them. 2. A press working apparatus for performing a press working between a movable die attached to a movable ram and a fixed die attached to a fixed bed, wherein the ram retreats to a retracted position after reaching a machining position. Until then, a stopper for holding the distance between the fixed type knockout pin provided in the fixed type and the movable type at a predetermined minimum dimension pushes out the fixed type knockout pin and operates the fixed side knockout mechanism and the ram. A press working device characterized by being provided between them. 3. A press working apparatus for performing press working between a movable die mounted on a movable ram and a fixed die mounted on a fixed bed, and then retracted to a retracted position after the ram reaches a machining position. Until that time, the first stopper that keeps the distance between the movable knockout pin provided in the movable mold and the fixed mold at a predetermined minimum dimension pushes out the movable knockout pin, and operates the movable side knockout mechanism and the bed. A second stopper, which is provided between the movable knockout mechanism and the fixed knockout pin, holds a minimum distance between the movable knockout pin and the fixed knockout pin provided in the fixed mold at a predetermined value. A press working device characterized in that it is provided between a fixed-side knockout mechanism that is operated to eject.