JP3246922B2 - Ram drive for punch press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ram drive for a punch press.

[0002]

2. Description of the Related Art Hitherto, the driving of a ram in a punch press has often been driven by an eccentric shaft. In each of these eccentric shafts, a support shaft is provided at a position eccentric with respect to the rotation shaft, and a link for vertically moving the ram is attached to the support shaft, and a top dead center generated during one rotation of the rotation shaft is provided. And the bottom dead center, the ram was configured to raise and lower.

However, in the above-described configuration, the movement of the ram takes the shape of a sine curve, the time for processing the material is short near the bottom dead center , the descending speed is fast, and the impact sound and the material hit by the punch hit the material. There is a drawback that the sound generated when the rupture is broken is noisy.

For this reason, in recent years, a cam is provided on a rotating shaft,
A ram drive that transmits the rotation of the cam to the ram via a roller has been used. In the ram drive device using the cam, the roller must always contact the cam,
The roller is brought into contact with the cam by interposing an elastic member such as a spring or a balancing cylinder system provided with two cylinders at both ends of a support portion that supports the rotating shaft of the roller.

[0005]

In the ram driving device constructed as described above, when the cam provided on the rotating shaft rotates, the ram is generally rapidly formed in the initial part of one cycle, depending on the shape of the cam. Lowering, the punching is performed at a low speed at the time of press working, and the noise rises little because it rises rapidly after the punching.However, the supporting portion supporting the rotating shaft of the roller is formed by the elastic member such as the balancing cylinder or the spring. because it is pressed by the cam side, supporting portions of the rollers torque and heat generation becomes larger than necessary, there is a drawback that overload or mow the motor for rotating the cam by continuous operation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to prevent the generation of noise at the time of press working by a drive system using a cam and to prevent a ram drive from overloading a motor. It is intended to provide a device.

[0007]

SUMMARY OF THE INVENTION The conventional problems as described above.
In view of the above, the present invention provides a striker for hitting a punch.
A ram lowering cam and a ram for moving the provided ram body up and down
A cam for raising the cam is provided on the cam drive rotary shaft,
Ram descending roller which is in contact with the cam surface of the cam and the ram
The ram elevating roller that comes into contact with the cam surface of the elevating cam is
In the ram drive of the punch press provided on the ram body side
The ram body descends and the striker turns into a punch
Make sure that the ram
Upper side of the ram lowering cam when the body is at the highest position
Is a nearly circular arc and the lower side is a flat arc with a short radius
The ram elevating cam is configured such that the ram body is
Nio so that the largest diameter portion is an upper case at the Noboru Ue position
It is formed in a substantially elliptical shape.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 3 is a side view of a turret punch press embodying the present invention as an example of a punch press. The turret punch press 1 includes a C-shaped frame 5 having a space 3, and a fixed table 7 on which a work W is placed is provided below the space 3 of the C-shaped frame 5. On the right side of the fixed table 7, a work positioning device 9 for positioning the work W is provided. On the left side of the fixed table 7, a disk-shaped upper turret 13 with a punch 11 and a disk-shaped with a die 15 are provided. Lower turret 17
Is provided. A striker 21 that strikes the punch 11 at the processing position of the upper turret 13 is provided on the frame 5 above the turret device 19.
The ram main body 23 provided with is mounted so as to be able to move up and down.

The positioning device 9 includes a rail 27 provided on a lower frame 25 positioned below the space 3.
, A carriage 33 supported movably in the front-rear direction via a rail 31 erected on the movement table 29, and a carriage 33 supported by the carriage 33. And a clamp 35 for holding the work W provided therebetween, and positions the work W in front, rear, left and right with respect to the turret device 19.

The turret device 19 includes a disk-shaped upper turret 13 rotatably supported via a rotating shaft 39 on an upper frame 37 located above the space 3.
The rotation shaft 4 is attached to the lower frame 25 located below the space 3.
1 and a lower turret 17 which is rotatably supported via a disk 1 and is synchronously rotated in the same direction by a rotary driving device (not shown) such as a servomotor.
A plurality of punches 11 are supported near the outer periphery of the upper turret 13, and a plurality of dies 15 corresponding to the plurality of punches 11 are supported on the lower turret 17.

The ram main body 23 is formed of a columnar member as shown in FIGS. 1 and 2, and a support member 45 for supporting the ram lowering roller 43 on the rotary support shaft 42 is integrally formed on the upper portion thereof. ing. This support member 45 extends upward
It is a member having a shape, and a cutout 49 for storing and fixing the bearing member 47 is formed in the center. The ram lowering roller 4
3 is rotatably provided on a bearing member 47 housed and fixed in the notch 49. A ram guide 53 is provided on the outer periphery of the cylindrical portion of the ram main body 23 via a bush material 51, and the ram guide 53 is fixed to a flat mounting member 55. The mounting member 55 is connected to the upper frame 3.
7 is fixed via a socket screw 57.

A frame 59 formed of a substantially convex frame is integrally mounted on a support member 45 connected to the ram body 23 by a socket screw 61.
A rotary support shaft 63 is provided on the upper portion of the frame 59, and a ram elevating roller 65 is rotatably provided on the rear side surface of the frame 59 on the rotary support shaft 63.

On the other hand, a cam drive rotary shaft 67 is rotatably provided on the upper frame 37 as shown in FIG.
The leading end extends to the lower side of the ram raising roller 65, and the leading end of the ram lowering roller 43 is
A ram lowering cam 69 where the peripheral surface and the cam surface are in rolling contact, and a ram raising cam 71 where the peripheral surface of the ram raising roller 65 and the cam surface are in rolling contact are integrally mounted. The cam surface of the ram lowering cam 69 is used when the ram body 23 is lowered.
Acts on the ram lowering roller 43, and
The cam surface is for raising the ram when the ram body 23 is raised.
Those acting on the rollers 65, lifting the 180 ° phase
Acts on the ram lowering roller 43 and the ram raising roller 65
Things .

The ram lowering cam 69 is shown in FIG.
Thus, when the ram body 23 is in the highest position, the upper side of the long diameter
Is a substantially circular arc, and the lower side is formed into a flat circular arc whose length becomes shorter in the radial direction. The shortest radius of this flat arc is
As the longest diameter portion of the ram rising cam 71 when positioned on the side is <br/> upper ram raising cam 71 has a substantially elliptical shape. And the longest diameter of the ram raising cam 71
Partial ram elevating roller 65 at a position that comes into contact with the outer peripheral surface of position
When placing , the frame 59 is lifted to the highest position, and the ram main body 23 is in the highest state (the state of FIG. 1).

Next, at the position where the cam drive rotary shaft 67 is rotated by 180 °, the long diameter portion of the ram lowering cam 69 has a substantially circular arc shape.
When the part is rotated downward, the longest diameter portion of the ram elevating cam 71 becomes the lowest point position, and the ram body 23
A state in which the most lowered projects from ram guide 53 is lowered by the action of the ram lowering cam 69. The striker 21 is screwed to the lower bottom surface of the ram main body 23, and the punch 11 of the upper turret 13 is pushed down, so that the clamp 3 of the work positioning device 9
9 can be punched out.

As described above, since the ram body 23 is moved up and down by the rotation of the cam drive rotary shaft 67, the ram body 23 is lowered when the striker 21 comes into contact with the punch 11.
The speed is slowed down by the shape of the ram lowering cam 69, and the contact is relatively slow rather than shocking, so that generation of noise is prevented. However, during the process of this one cycle, the rotation of the ram lowering cam 69 and the ram raising cam 71 causes the ram lowering roller 43 and the ram raising roller 65 to prevent the opposing sides from operating with each other. You need to decide to move smoothly. In ram lowering cam 69 having the shape shown in FIG. 1, range from point O of the cam drive-rotation shaft 67 is rotated in a clockwise direction until the point P (the origin than 90 ° position)
When the ram lowering roller 43 is pressed down by the surroundings
Falls rapidly and is pressed by the range from point P to point Q
It is set so that it sometimes becomes slow and can rise sharply in the range from the point Q to the point O. Then, the ram raising cam 71 also rotates clockwise at the same time, and the distance between the shafts is sharply reduced in the range from the point R to the point S, so that the ram main body 23 can be rapidly lowered.

[0018]

The present invention can be understood from the above description of the embodiments.
As described above, in the present invention, the cam drive rotary shaft 67 is
A cam lowering cam 69 and a ram raising cam 71 are provided.
The ram lowering cam 69 is provided on the movable ram body 23 side.
The ram lowering roller 43 and the ram raising roller 43
And a ram elevating roller 65 that comes into contact with the cam surface of the
With this configuration, the rotation of the cam drive rotary shaft 67
The ram lowering cam 69 and the ram raising cam 71 are
The ram lowering roller 43 and
The ram body 23 is moved up and down via the ram raising roller 65.
The ram lowering cam 69 is
When the body 23 descends and the striker 21 contacts the punch
The ram body 23 rises to the maximum so that the descent speed slows down
When it is located at the position, the shape of the upper side is almost
The side has a shape of a flat arc with a short radius, and the ram
The lifting cam 71 holds the ram body 23 at the highest position.
Almost elliptical so that the longest diameter is at the top
The striker provided in the ram body 23
The descent speed when the abutment 21 contacts the punch is relatively slow
Noise due to the impact sound during contact
Can solve the conventional problems as described above.
It can be .

[Brief description of the drawings]

FIG. 1 is a front view of a ram driving device of a punch press according to an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a side view of a punch press equipped with the ram drive device of FIG. 1;

[Explanation of symbols]

 23 Ram Main Body 43 Ram Lowering Roller 45 Support Member 59 Frame 63 Rotating Support Shaft 65 Cam Raising Roller 69 Ram Lowering Cam 71 Ram Raising Cam

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B30B 1/26 B21D 28/34 B30B 15/00 B21D 28/20

Claims (1)

(57) [Claims] 1. A striker (21) for hitting a punch.
For lowering the ram to move the provided ram body (23) up and down
The cam (69) and the ram elevating cam (71) are
The ram lowering cam (69) is provided on the rotation shaft (67).
Ram lowering roller (43) that is in rolling contact with the
Ram raising roller which is in contact with the cam surface of the raising cam (71)
(65) provided on the side of the ram body (23)
In the ram drive device, the ram body (23) is
When the striker (21) comes down and comes into contact with the punch
So that the lowering speed of the ram becomes slower.
When in the highest position, above the ram lowering cam (69)
The lower part is a flat arc with a short radius.
And the ram raising cam (71) is
The longest part when the ram body (23) is at the highest position
A ram drive device for a punch press, wherein the ram drive device is formed in a substantially elliptical shape such that the upper portion is located at an upper portion .