JP2001087825A - Press die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press die capable of preventing a punch tip in use for long time from breaking and easily conducting press working of holes different in an inclined direction using the same die when conducting press working of an inclined hole. SOLUTION: A press die 1 is constituted so that a hammer pin 5, which is supported between the cam and the punch and is moved in the direction same as the moving direction of the punch in order to transmit movement of a cam 6 in the vertical direction by a moving die 7 to a punch 4 moving in the direction inclining to the vertical direction, is arranged at the intermediate part 3 of a fixed die 2. The hammer pin is guided by a hammer guide 32 arranged at the intermediate part. Similarly, the cam is guided by a cam guide 33 fixed to the intermediate part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press die for press-working a small oblique hole in a metal plate.

[0002]

2. Description of the Related Art An ordinary press die is provided with a punch and a die perpendicular to the upper surface of a die plate, and is configured to punch a metal plate material from a right angle direction. But,
Some products require machining of oblique holes in the metal plate. As a press die for press forming such an oblique hole, there is a press die as shown in FIG. 6 disclosed in Japanese Patent Application Laid-Open No. Hei 10-166189. This press die has a fixed die 2 and a movable die 7 and a die unit 30 (intermediate body) having a die on the fixed die, and a punch unit having a punch 4 and forming a pair with the die unit. 3 (intermediate portion), the punch unit 3 is moved downward by the downward movement of the movable mold 7, and the metal plate material 100 is sandwiched between the die unit 30 and the movable unit 7. The movement is performed by a punch head that contacts the surface of the movable type oblique cam 6,
The punch 4 is moved along the punch guide 31 and the punch tip guide 34 by changing the direction of movement of the punch 4 to the obliquely downward direction, and the metal plate material 100 sandwiched between the die unit 30 and the punch unit 3 on the fixed die. The punch 4 is used for press working.

However, in this known press die,
The sliding body serving as the punch 4 is guided by a punch guide 31, and the punch tip provided at the tip of the punch is
It is guided by a punch tip guide 34 provided on the punch guide. In addition, the tip of the punch is guided by a tip guide with a small gap in order to perform high-precision pressing. In this case, there is a problem that a bending force is generated at the tip of the punch due to a lateral force (see FIG. 4) from the inclined surface of the cam 6 and the tip of the punch is broken when press working is continued. Further, as shown in FIG. 4, a large load is applied in a direction perpendicular to the direction in which the punch moves, and the punch guide 31 is worn away. Was. Furthermore, when drilling holes with the same inclination but different directions of inclination, there is a problem that the mold must be replaced and it takes time.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to prevent the tip of a punch from breaking due to long-time use, to press a fine inclined hole with high accuracy, and to improve the inclination direction. An object of the present invention is to provide a press die which can easily press different holes using the same die.

[0005]

According to the present invention, as a means for solving the above-mentioned problems, there is provided a press die described in each of the claims. The press die according to claim 1 is capable of moving the cam in the vertical direction to the intermediate portion in the same direction as the punch in order to transmit the movement of the cam to the punch moving in a direction inclined with respect to the vertical direction. The hammer pin supported is provided, and by this, the punch is moved by the movement of the hammer pin pushed by the cam, so that a large load is applied to the hammer pin in a direction perpendicular to the moving direction, but the punch is applied to the hammer pin. Applies only the force in the direction of movement, eliminates wear on the punch and guide, prevents the punch from tilting even when used for a long time, and prevents the bending moment from acting on the punch tip, preventing the punch tip from breaking. it can.

[0006] The press die according to the second aspect is the first aspect of the invention.
In addition to the above configuration, a configuration in which the cam is movably supported by the intermediate portion is added, whereby, in addition to the above-described operation and effect that the press die of claim 1 has, the cam is moved to the intermediate portion. With the same mold, it is possible to rotate the fixed mold to change the direction of the tilt of the punch and press it, so that holes with different directions of inclination can be easily set up and processed using the same mold. become.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A press die according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view of a press die according to a first embodiment of the present invention.
FIG. 2 is a front sectional view of a press die according to a second embodiment of the present invention. The press die 1 according to the first embodiment of the present invention includes a fixed die 2 and a movable die 7, and the fixed die 2 is provided with an intermediate body 30. An intermediate section 3 is provided on the upper side. Fixed type 2
The intermediate part main body 30 is positioned by two positioning pins 24 and fixed by four bolts 25. The intermediate portion 3 is supported by four positioning pins 20 on the intermediate portion main body 30, and is slidable up and down so as to open and close the mold. The positioning pin 20 has a body and a head divided structure, which are fixed by bolts 22, and are urged by a compression spring 21. The compression spring 21 is enclosed in the fixed mold 2 by a set screw 23. A die 36 is obliquely fitted into the intermediate body 30 at a predetermined angle.

On the other hand, the movable mold 7 has a ring 71 and a disc 72.
And is installed. The ring 71 is movably supported by the movable mold 7 by bolts 73, and a spring 74 for urging the ring 71 is interposed between the ring 71 and the movable mold 7. The disk 72 is a bolt 75
To the movable mold 7.

In the above-mentioned intermediate portion 3, four pressing rods 35 are fixed around its periphery by bolts, and when the movable die 7 is lowered by the pressing rod 35 via the ring 71, the intermediate portion 3 is received.
The mold is to be clamped. Further, inside the intermediate portion 3, a punch guide 31 for guiding the movement of the punch 4 for pressing a hole in the metal plate material 100 and a punch tip guide 34 for guiding the movement of the tip of the punch are fixed obliquely at a predetermined angle. It is provided. This inclination angle matches the inclination of the die 36. Note that a spring that is compressed by the downward movement of the punch 4 is provided in the punch guide 31.

Further, the intermediate portion 3 has a cam guide 33 for guiding the movement of the movable mold 7 and the movement of the cam 6 for transmitting the load to the hammer pin 5, and the movement and load of the cam 6. Hammer pin 5 to tell punch 4
And a hammer pin guide 32 that guides the movement of the body is fixed by bolts or the like. The tip of the punch 4 is tapered, and the rear end is spherical so that the force from the hammer pin 5 is applied on the central axis. The lower portion of the hammer pin 4 disposed between the cam 6 and the punch 4 has a stepped shape in order to prevent the hammer pin 4 from protruding from the hammer pin guide 32, and the upper end receives the force from the cam 6 at the central axis. It has a spherical shape to hang on top. The cam 6
The two parts are connected by bolts 38, and a spring 37 is provided between the cam guide 33 and the cam guide 33 to bias the cam 6. Further, the lower end surface of the cam 6 is an inclined surface, and when the movable die 7 descends, the movable disk 72 comes into contact with the head of the cam 6, and the inclined surface of the cam 6 is formed into a spherical shape of the hammer pin 5. A force is transmitted to the punch 4 by contacting the end.

FIG. 3 shows a processing state diagram of the press die according to the first embodiment of the present invention configured as described above, and its operation will be described with reference to FIG. FIG. 3A shows a stage in which the metal plate material 100 is fed, in which the movable mold 7 waits upward, and the intermediate portion 3 and the intermediate portion main body 3 are placed.
0, the compression spring 2 biasing the positioning pin 20
The intermediate part 3 is lifted by the force of 1 and there is a gap,
It is in a so-called mold opening state. In this state, the metal plate 100 is fed in from the left side of the drawing. Next, when the movable mold 7 is moved by a press (not shown) and lowered toward the fixed mold 2, first, the end face of the ring 71 comes into contact with the pressing rod 35 extending upward from the intermediate section 3, and the intermediate section 3 is pressed. Is lowered. A metal plate material 100 is inserted between the intermediate portion 3 and the intermediate portion main body 30 to hold it. This state is the stage of mold clamping and plate material holding shown in FIG.

When the movable mold 7 is further lowered, the ring 71 compresses the spring 74 pressing the ring, and then the disk 72 comes into contact with the cam 6 to press and lower the cam 6. The cam 6 pushes the hammer pin 5 on the inclined surface to lower the hammer pin 5 obliquely guided by the hammer pin guide 32 diagonally downward. Further, the hammer pin 5 pushes the punch 4 to lower diagonally downward and fixes it. A die 36 fixed to the intermediate body 30 of the mold 2
In cooperation with the above, a diagonal hole is pressed in the metal plate material 100. This state is the punching stage shown in FIG. When the drilling is completed, the movable mold 7 rises and returns to the original position, the pressing of the intermediate portion 3 is released, and the intermediate portion 3 and the intermediate portion main body 30 are opened as shown in FIG. In this state, the metal plate 100 is in the initial feedable state.

Next, the structure of a press die 1 according to a second embodiment of the present invention shown in FIG. The major structural differences from the press die 1 of the first embodiment are that the cam 6 'is fixed to the movable die 7 without the cam guide 33, and that the presser bar 35 Is supported on the movable mold 7 side. That is, the movable mold 7 is formed by connecting three parts with bolts 26 as shown in the drawing, and the cam 6 'is fixed to the movable mold 7 and the pressing rod 35' is movable. It is supported by. The cam 6 ′ is formed of a single member, and has an inclined surface at the tip, and the inclined surface comes into contact with the spherical end of the hammer pin 5. The presser bar 35 'is urged downward by a spring contained in the movable die 7. In the second embodiment, the cam guide 33 on the intermediate section 3 has been removed.
The operation of the press die 1 of the second embodiment is similar to that of the first embodiment, and operates in the processing state shown in FIG. The press die according to the second embodiment can be said to be a press die having a structure in which a hammer pin 5 and a hammer pin guide 32 are added to the press die having a conventionally known structure shown in FIG. .

As can be understood from the above description, the press die 1 of the present invention has the cam 6 by disposing the hammer pin 5 between the cam 6 and the punch 4 as shown on the right side of FIG. When the downward load of the hammer pin 5 is divided into a load for moving the hammer pin 5 in an oblique direction and a resistance between the hammer pin 5 and the hammer pin guide 32, a large resistance acts. The load applied is only the load for moving the punch 4, and only a small drag acts between the punch 4 and the punch guide 31.
The abrasion between the punch 4 and the punch guide 31 is reduced, the gap α between the punch 4 and the punch guide 31 can be kept small, and the punch 4 tilts in the punch guide 31 (runout β).
Therefore, it is possible to prevent a bending moment from being generated at the tip of the punch, and it is possible to prevent the tip of the punch from breaking. On the other hand, in the prior art, since the punch 4 is directly pressed by the cam 6 as shown on the left side of FIG.
The gap α between the punch guide 31 and the punch guide 31 increases, the deflection β of the tip of the punch increases, and a bending moment is generated. The effect of preventing the tip of the punch from being broken is as described in the second embodiment in which the cam 6 is fixed to the movable mold 7 even in the press die of the first embodiment in which the cam 6 is supported by the intermediate portion 3. The same applies to the press die.

Further, in the press die according to the first embodiment of the present invention, the movable die 7 is formed into an end surface symmetrical with respect to rotation by supporting the cam 6 movably on the intermediate portion 3. By rotating the fixed mold 2, the intermediate body 3
0, the intermediate portion 3, the hammer pin guide 32, and the cam guide 33 rotate together, and the portion that is inclined is also rotated, so that a square that is equidistant from the center of the metal plate 100 is formed as shown in FIG. Even when forming a hole in which the inclination angles are the same at the four corners and the inclination directions are shifted by 90 °,
By rotating the fixed mold 2 as shown in FIGS. 5A to 5D, press working can be performed using the same mold. In addition,
By changing the rotation angle of the fixed mold, the same mold can cope with various numbers of inclined holes.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a press die according to a first embodiment of the present invention.

FIG. 2 is a front sectional view of a press die according to a second embodiment of the present invention.

FIG. 3 is a process diagram illustrating states of the press dies in respective processing steps when press working is performed using the press dies according to the first embodiment of the present invention.

FIG. 4 is a diagram for comparing and explaining the states of operation of respective punches when a press die of the present invention and a conventional press die are used.

FIG. 5 is a diagram showing four inclined holes which are equidistant from the center and correspond to the corners of a square on a metal plate using the press die of the present invention, and are pressed using the same die. It is a figure explaining each rotation position (a)-(d) of a fixed type | mold in the case of doing.

FIG. 6 is a front sectional view of a conventional press die.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Press die 2 ... Fixed mold 3 ... Middle part 4 ... Punch 5 ... Hammer pin 6 ... Cam 7 ... Movable mold 30 ... Middle part main body 31 ... Punch guide 32 ... Hammer pin guide 33 ... Cam guide 100 ... Metal plate material

Claims (2)

[Claims] 1. A press die for press-working an oblique hole in a plate material, comprising: a fixed die serving as at least a base; an intermediate portion supported by the fixed die so as to be linearly movable; and a moving direction of the intermediate portion. A punch supported movably in an inclined direction, a hammer pin supported movably on the intermediate portion in the same direction as the moving direction of the punch, and a cam moving in the same direction as the moving direction of the intermediate portion; And a movable mold for moving the cam and the intermediate portion. 2. The press die according to claim 1, wherein said cam is movably supported by said intermediate portion.