JP3841510B2 - Press machine change retainer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a change retainer for a press machine, and more specifically, a retainer for holding a punch or die for performing sheet metal processing such as punching, piercing, and burring in a holder, and pressing the punch or die. The present invention relates to a change retainer capable of increasing the amount of protrusion from the holder of the punch or die when used in the press and switching the amount of protrusion so as to reduce the amount of protrusion when not used for press working.
[0002]
[Prior art]
The change retainer of the press machine is also called a select retainer set or a pierce punch switching device. For example, when a plurality of sets of punches and dies are attached to a single press machine to perform sheet metal processing, This is for selecting a set of punches and dies to be used according to the conditions. That is, the punch and die set used for machining is made to protrude from each holder with a large amount of protrusion, and the punch and die set not used for machining is both of the punch or the die. The amount of protrusion is reduced so that it does not hit the workpiece.
[0003]
Such a change retainer for switching the protrusion amount of the punch or die is configured by a switching mechanism portion for switching the protrusion amount of the punch or die and a cylinder device for driving and controlling the mechanism portion. For example, as shown in FIG. 6, the switching mechanism is such that the cam member (select bar) a is slid laterally on the back surface of the punch c of the retainer body b to change the protruding amount of the punch c. The cam member a is usually connected to the piston rod e of the cylinder device d by a connecting member f.
[0004]
Further, as shown in FIG. 7, there is also known one in which a guide h of a punch c is coupled to a cylinder g, and a protruding amount of the punch c is changed by a cam j formed on a piston i.
[0005]
[Problems to be solved by the invention]
However, in the former case of the above prior art, it is necessary to connect the cam member and the piston rod outside the retainer body, and the cylinder device cannot be directly connected to the retainer body. Is difficult. Therefore, when a plurality of change retainers are attached to the holder, there is a problem that the degree of freedom regarding the arrangement of punches and dies is lowered due to the problem of interference between the change retainers.
[0006]
In the latter case of the above prior art, although the change retainer is advantageous in size reduction, the cylinder and the piston also serve as a mechanism for changing the punch protrusion amount. Therefore, when the cylinder or the piston is damaged, they are replaced alone. It is not possible to replace the entire change retainer.
[0007]
Furthermore, it is desired to reduce the size of the entire change retainer and prevent foreign matter from entering the cylinder.
[0008]
[Means for Solving the Problems]
In the present invention, the piston rod of the cylinder device can be switched as described above while the mechanism for switching the protrusion amount of the punch or die and the cylinder device for driving the mechanism are separated from each other. utilized as a cam for further by Rukoto abutted over the entire periphery of the rod seal of the cylinder device to the piston rod insertion hole around the guide, in which attempted to solve them.
[0009]
That is, in the invention of this application, when the punch or die is held in the holder and the punch or die is used for pressing, the amount of protrusion from the holder of the punch or die becomes large, and the amount of protrusion is small when not used. A change retainer for a press machine that switches the protruding amount so as to be,
A guide attached to the holder and supporting the punch or die so as to freely advance and retract so that the amount of protrusion changes;
A cylinder device attached to the guide for switching the amount of protrusion of the punch or die,
On the piston rod of the cylinder device, a cam for moving the punch or die back and forth to a use position where the protrusion amount is large and a non-use position where the protrusion amount is small is formed by sliding the back surface of the punch or die .
The cylinder device has a rod whose front surface is in contact with the circumference of the piston rod insertion hole of the guide over the entire circumference and whose inner peripheral surface is in contact with the outer peripheral surface of the piston rod over the entire circumference of the opening of the cylinder mounting surface with respect to the guide. A seal is fitted .
[0010]
In the case of this invention, since the cam is formed on the piston rod of the cylinder device, the conventional connection between the piston rod and the cam member becomes unnecessary, which is advantageous for downsizing the change retainer. Further, since the cylinder device and the guide are separate bodies, maintenance by the cylinder device alone becomes possible.
[0011]
With respect to the cylinder device, the front surface abuts around the piston rod insertion hole of the guide over the entire circumference and the inner circumferential surface abuts over the entire circumference of the piston rod on the opening of the cylinder mounting surface with respect to the guide. and a configuration in which fit the rod seal.
[0012]
As a result, the cylinder device can be directly connected to the guide without providing a separate packing (dust seal), which is advantageous for reducing the size of the entire change retainer and for preventing foreign matter from entering the cylinder. .
[0013]
In addition, it is preferable that the positioning pin for positioning the change retainer with respect to the holder is disposed at the processing center of the punch or die. As a result, the change retainer can be mounted on the holder in an arbitrary direction within a range of 360 degrees with respect to the processing center.
[0014]
【The invention's effect】
Therefore, according to the invention of this application, the cylinder device is attached to the guide of the punch or die, and the cam is formed on the piston rod to change the protrusion amount of the punch or die. The retainer can be easily reduced in size, and thus the degree of freedom in design regarding the arrangement of the punch and die is increased, and the maintenance of the cylinder device is facilitated. In addition, since the cylinder device rod seal front surface is in contact with the entire circumference of the guide rod rod insertion hole, the cylinder device can be directly connected to the guide, and changes can be made while preventing foreign matter from entering the cylinder. This is advantageous in reducing the size of the entire retainer.
[0015]
Further, according to the change retainer positioning pin arranged at the punch or die processing center, the degree of freedom of arrangement of the change retainer on the holder is increased.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, 1 is a punch holder of a press machine, 2 is a die holder, 3 is a presser that presses the workpiece 4 toward the die holder 2, 5 is a change retainer that holds the punch 6 on the punch holder 1, and 7 is a die holder 2. It is a die provided. A spring (not shown) is provided between the punch holder 1 and the presser 3 to urge the presser 3 downward from the punch 6, and the presser 3 is lowered by the lowering of the punch holder 1. The workpiece 6 is lowered in advance to hold the workpiece 4 toward the die holder 2, and then the punch 6 comes into contact with the workpiece 4 to perform punching.
[0017]
As shown in FIG. 2, the change retainer 5 includes a casing (guide) 8 that supports the punch 6 so as to be movable up and down, and a spring receiver 9 so that the punch 6 is in a non-use position where the protrusion amount from the punch holder 1 is small. A return spring 11 that is biased via the air spring, a pneumatic cylinder device 12 that is disposed in a lateral direction that drives the punch 6 to a use position where the protruding amount is large against the biasing force of the return spring 11, and a backing 13 And comprising.
[0018]
The casing 8 is provided with a jaw-shaped opening 15 that opens forward in which the spring receiver 9 moves up and down, at a position at an intermediate height in the front part thereof. As shown in FIG. 3, a circular guide hole 16 penetrating vertically is formed in the lower jaw part of the front part to guide the raising and lowering of the punch 6, and the backing 13 fits in the upper jaw part. A hole 17 is formed. The guide hole 16 and the backing hole 17 are formed concentrically with each other so as to face each other.
[0019]
As shown in FIG. 4, the casing 8 includes bolt insertion holes 18 and 18 penetrating in the vertical direction for attaching the casing 8 to the punch holder 1 on the left and right sides of the rear portion. The positioning pin 19 for the projection protrudes. The back of the jaw-shaped opening 15 continues to the rod hole 20 in the front-rear direction in which the piston rod of the cylinder device 12 advances and retreats.
[0020]
As shown in FIG. 3, two return springs 11 are provided, each of which is provided with spring insertion holes on the left and right of the rear end of the lower jaw. The spring receiver 9 has a horizontal plate shape and is provided with a punch hole at the center thereof. The punch 6 is fitted into the punch hole and the upper edge flange is supported on the upper surface of the spring receiver 9. ing. Further, the peripheral edge of the spring receiver 9 has a protruding portion 9a protruding so as to be the same height as the upper surface of the punch 6 fitted in the punch hole, and a cam described later slides on the rear end of the upper end of the protruding portion 9a. An inclined surface is formed.
[0021]
The backing 13 has a cylindrical shape and includes a positioning pin 21 protruding upward at the center of the upper surface thereof. The positioning pin 21 and the positioning pin 19 described above are inserted into the pin hole of the holder 1 when the change retainer 5 is attached to the punch holder 1, and the positioning pin 21 of the backing 13 is positioned. Is arranged on the axial center of the punch 6, that is, at the processing center.
[0022]
The cylinder device 12 includes a cylinder 23, a piston rod 24, and a rod seal 25. The cylinder 23 is directly connected to the back surface of the casing 8 by a bolt. A cam 24a is formed at the front portion of the piston rod 24. The cam 24a is formed so that the upper and lower surfaces are cut flat and the front end surface is inclined forward as it goes upward. The rod seal 25 is an annular one fitted in the opening of the mounting surface of the cylinder 23 with respect to the casing 8, and the front surface thereof abuts around the rod hole 20 of the casing 8 over the entire circumference, and the inner circumference. The surface is in contact with the outer peripheral surface of the rear portion of the piston rod 24 over the entire circumference.
[0023]
Therefore, as shown in FIG. 1, in the state where the piston rod 24 is retracted, the punch 6 is in a state of a small projecting amount raised by the urging force of the return spring 11 together with the spring receiver 9, and the punch holder 1 is lowered. However, the workpiece 4 is not processed. Therefore, when the piston rod 24 is protruded as shown in FIG. 5, the cam 24a at the front portion thereof slides in the lateral direction on the protrusion 9a of the spring receiver 9 by the inclined surface of the front end, and the upper end rear edge portion of the punch 6 , The spring receiver 9 and the punch 6 are pushed down against the urging force of the return spring 11. Thereby, punch 6 will be in the state of a large amount of protrusions. Therefore, when the punch holder 1 is lowered, the punch 6 hits the workpiece 4 and punches it.
[0024]
In this embodiment, since the cam 24 a is formed on the piston rod 24, it is not necessary to connect the piston rod and the cam member, and the overall length thereof is shortened, and the cylinder 23 is directly connected to the casing 8. Therefore, the change retainer 5 is entirely small. The rod seal 25 serves as a packing that prevents dust from entering the cylinder from between the casing 8 and the cylinder 23, and it is not necessary to provide a separate packing, so that the cylinder device 12 protrudes from the back surface of the casing 8. Reduce the amount.
[0025]
Further, since the positioning pin 21 is arranged at the processing center, the change retainer 5 can be attached to the punch holder 1 with an arbitrary angle with respect to the processing center, and it is easy to avoid interference with other change retainers. Become.
[0026]
Although the above embodiment relates to a change retainer for punches, it is needless to say that the present invention can also be applied to a change retainer for dies.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a press machine in which a punch has a small protruding amount by a change retainer.
FIG. 2 is a cross-sectional view showing a change retainer in a state where a punch protrusion amount is large.
3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a plan view showing the change retainer with a partial cross section.
FIG. 5 is a cross-sectional view of a press machine showing a state in which a change retainer is used to increase the punch protrusion amount.
FIG. 6 is a sectional view of a conventional change retainer.
FIG. 7 is a cross-sectional view showing another example of a conventional change retainer.
[Explanation of symbols]
1 Punch Holder 2 Die Holder 5 Change Retainer 6 Punch 7 Die 8 Casing (Guide)
12 Cylinder device 13 Backing 15 Jaw-shaped opening 16 Guide hole 17 Backing hole 21 Positioning pin 23 Cylinder 24 Piston rod 24a Cam 25 Rod seal

Claims (2)

When the punch or die is held in the holder and the punch or die is used for pressing, the amount of protrusion from the holder of the punch or die is increased, and the amount of protrusion is switched so that the amount of protrusion is reduced when not used. A press machine change retainer,
A guide attached to the holder and supporting the punch or die so as to freely advance and retract so that the amount of protrusion changes;
A cylinder device attached to the guide for switching the amount of protrusion of the punch or die,
On the piston rod of the cylinder device, a cam for moving the punch or die back and forth to a use position where the protrusion amount is large and a non-use position where the protrusion amount is small is formed by sliding the back surface of the punch or die .
The cylinder device has a rod whose front surface is in contact with the circumference of the piston rod insertion hole of the guide over the entire periphery and whose inner peripheral surface is in contact with the outer peripheral surface of the piston rod over the entire periphery of the opening of the mounting surface of the cylinder with respect to the guide. A change retainer for a press machine, wherein a seal is fitted . In the change retainer of the press machine according to claim 1,
A change retainer of a press machine, wherein a positioning pin for positioning the retainer with respect to the holder is disposed at a processing center of the punch or die.

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