JPH0344424Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shearing machine, and more particularly to a reverse plate holding device that supports a plate from below with respect to an upper blade of a shearing machine.

When shearing a plate material with a shearing machine, the semi-finished products cut into strips tend to warp or twist. In order to solve such problems, a technique has been developed in which a reverse plate holding member is provided to the upper blade to support the semi-finished product from below. However, in the past, since the lower blade and the upper blade intersect to support the part where shearing is being performed from below,
The end portion of the semi-finished product tends to sag due to its own weight, and the above-mentioned problem cannot be effectively solved.

Furthermore, as disclosed in, for example, Japanese Utility Model Publication No. 52-45911 (hereinafter simply referred to as the prior example), there is a structure in which a plate material is held between the lower surface of the upper blade by multiple work supporting rods; In the case of the example, since the workpiece support rods are provided at appropriate intervals, it is unavoidable that the edge of the plate material is located between the workpiece support rods, and it is necessary to securely hold the area near the edge. There is a problem. Further, when the upper blade rises after shearing the plate material, the workpiece support rod is raised by the spring and pushes up the plate material, which poses a problem in quickly and smoothly carrying out the plate material.

This invention was devised in view of the above problems, and in order to prevent the sheared semi-finished product from warping or twisting, the upper blade and reverse plate holding member cover the entire length of the semi-finished product during shearing. The inverse plate holding member is held in place by the ram, and the return of the inverse plate holding member to the upward direction is delayed sufficiently after the upward movement of the ram.

Now, referring to FIG. 1, the shearing machine 1 is made up of both side frames 5 equipped with gap 3, and a table 7 that supports a plate material W, and a table 7 that supports a plate material W. A lower blade 9 extending in the left-right direction is attached. Further, between both side frames 5, a ram 13 is provided which is movable up and down and has an appropriately inclined upper blade 11 which cooperates with a lower blade 9 to shear the plate material W. , a back gauge device 15 for setting the shear length of the plate material W is mounted so as to be movable in the front-rear direction (left-right direction in FIG. 1), and a control cam 19 for controlling a control valve 17 to be described later near the top dead center. are integrally installed. Further, the shearing machine 1 is provided with a plate holding device 21 for pressing and fixing the plate material W to the table 7.

The lifting and lowering operation of the ram 13 is performed by the same structure as a general shearing machine, and the functions of the back gauge device 15 and plate presser device 21 may be the same as conventional ones, so the details thereof will be explained below. Explanation of the structure and operation will be omitted.

Referring to FIGS. 1 to 3, in order to support the semi-finished product part sheared from the plate material W by the lower blade 9 and the upper blade 11 from below, facing the upper blade 11, A reverse plate holding device 23 is provided on the rear surface of the table 7 (the right surface in FIG. 1).
This reverse plate presser device 23 includes a plurality of reverse plate pressers connected in the left-right direction (left-right direction in FIG. 2) along the rear surface of the lower blade 9 to face the upper blade 11 and support the plate material W from below. member 25 and each reverse plate pressing member 2
The upper blade 11 is made up of a plurality of fluid pressure cylinders 27, etc., which support the upper blade 5 so as to be vertically movable and tiltable along the inclination of the upper blade 11.

More specifically, as is clear from FIGS. 2 and 3, the plurality of fluid pressure cylinders 27 are respectively supported on the rear surface of the table 7 via pivots 29 so as to be swingable in the left and right directions in FIG. ing. Each piston rod 27R in each fluid pressure cylinder 27
The reverse plate holding member 25 is secured by a plurality of bolts 31.
The lower part of each support member 33 integrally provided with the upper part thereof is pivotally connected via a pin 35. Therefore, by moving the piston rod 27R in each fluid pressure cylinder 27 up and down, the reverse plate holding member 25 can be raised and lowered.

Each support member 33 has a plurality of bolts 3 so that each support member 33 can move up and down without greatly swinging.
It is located between the rear surface of the table 7 and a guide plate 41 that is mounted at a distance from the rear surface of the table 7 via the spacer block 39 and the guide plate 41. is prevented. Further, one end of a substantially horizontal link 45 is connected to one end of the plurality of support members 33 via a pin 43, and the other end of this link 45 is connected via a pivot 47. table 7
It is pivoted to the rear of the . Therefore, the link 45 prevents the support member 33 from moving significantly in the left-right direction in FIG.
That is, the support member 33 is smoothly moved up and down by the action of the guide plate 41 and the link 45.

Each reverse plate pressing member 2 is arranged so that the plurality of reverse plate pressing members 25 can be individually tilted along the inclination of the upper blade 11.
5 are individually connected to each other so as to be tiltable. That is, a semicircular arc-shaped connecting recess 25c is formed at one end of each reverse plate holding member 25, and a joint member 49 that can be freely engaged and detached from the connecting recess 25c is attached to the other end by bolts 51. be. Therefore, each inverse plate pressing member 25 is connectable and individually tiltable.

Referring to FIG. 4, each of the fluid pressure cylinders 2
The control valve 17 is disposed in the circuit 53 connected to each hydraulic cylinder 27 in order to control the operation of the hydraulic cylinder 7 in conjunction with the raising and lowering operation of the ram 13. More specifically, a control valve 17 is disposed between a main circuit 57 connected to a pressure source P via a check valve 55 and the circuit 53. A branch path 59 is connected to the main circuit 57, and this branch path 59 has a relief valve 61 and a cock 6.
3 are connected in parallel and the accumulator 6
5 is connected. Therefore, the relief valve 61
Due to this action, the pressure in the main circuit 57 etc. does not rise excessively, and if necessary, the pressure in the main circuit 57 etc. can be drained by operating the pot 63. be.

Referring again to FIG. 4, the valve frame 1 of the control valve 17
7B, a small-diameter first chamber 67 connected to the circuit 53 and a large-diameter second chamber 69 connected to the main circuit 57 are formed in communication with each other. A spool 71 that can freely communicate with and disconnect the chamber 67 and the second chamber 69 is slidably installed inside. This spool 71 is connected to a spring 7 installed inside the valve frame 17B so as to cut off communication between the first chamber 67 and the second chamber 69.
A follower 75 that can freely come into contact with the control cam 19 is attached to the protrusion 71P of the spool 71, which is always pressed in the direction of the first chamber 67 by the action of No. 3 and protrudes outward from the valve frame 17B. It is installed.

As is already clear from the above configuration, when the ram 13 is located near the top dead center, the spool 71 of the control valve 17 is moved by the control cam 19 to the spring 73.
The working fluid from the pressure source P is supplied to each fluid pressure cylinder 27. Therefore, each inverse plate holding member 25 is in a raised state, and its upper surface is substantially on the same plane as the upper surface of the lower blade 9.

When each inverse plate holding member 25 is in the raised state as described above, after placing the plate material W on the table 7 and positioning it, by lowering the ram 13, the plate material W is moved between the lower blade 9 and the upper part. It is sheared by the blade 11. When shearing the plate material W in this manner, each reverse plate holding member 25 is lowered against the biasing force of each fluid pressure cylinder 27, and is also inclined along the inclination of the upper blade 11. This is to clamp the semi-finished product being sheared between.
In other words, during shearing, the semi-finished product is compressed by the upper blade 11 and each reverse plate holding member 25 over the entire width of the shearing process, so that no warping or twisting occurs during shearing, and accurate shearing is possible. It is possible to do this.

As described above, when each reverse plate holding member 25 is lowered against each fluid pressure cylinder 27, the working fluid in each fluid pressure cylinder 27 slides on the spool 71 in the control valve 17 against the spring 73. At least it flows out to the main circuit 57 and is stored in the accumulator 65, and a part of it flows out through the relief valve 61.

As described above, when the ram 13 is returned from the bottom dead center to the top dead center after shearing the plate material W by lowering the ram 13, the spool 71 in the control valve 17 is released from the pressure by the control cam 19. , the communication between the first chamber 67 and the second chamber 69 of the control valve 17 is cut off. Therefore, since the working fluid from the pressure source P is not supplied to each fluid pressure cylinder 27, each inverse plate pressing member 25 is in a descending state without following the ram 13 and rising. Then,
The semi-finished product, which is being held under pressure by the upper blade 11 and each reverse plate holding member 25, is released by the rise of the ram 13 and falls downward.

When the ram 13 rises and reaches near the top dead center, the control cam 19 provided on the ram 13 presses the spool 71 of the control valve 17 against the spring 73. 2 rooms 69
The working fluid from the pressure source P is supplied to each fluid pressure cylinder 27. Therefore, each reverse plate pressing member 25 is raised and returned to its initial state.

As can be understood from the description of the embodiments above, in the present invention, a plurality of reverse plate holding members 2 are arranged continuously in the left and right direction along the rear surface of the lower blade 9.
5 is opposed to the upper blade 11, and the respective reverse plate holding members 25 are connected to each other so as to be freely rotatable in the vertical direction. Each of the reverse plate holding members 25 is provided to be vertically movable and tiltable along the inclination of the upper blade 11, and is biased upward. Therefore, as the ram 13 descends, the lower blade 9 and the upper blade 11
When shearing the plate material W by the cooperation of It is maintained in the same state. In addition, in the present invention, each inverse plate pressing member 25 is rotatably connected to compress the plate material W thoroughly according to the entire width.
It can accommodate changes in the thickness and width of the plate material W, prevents the edges from being pinched, and prevents warping and twisting of belt-shaped semi-finished products.

Furthermore, in the present invention, each fluid pressure cylinder 2
A control valve 17 is connected to a circuit 53 connecting 7 and a pressure source P.
A spool 71 is installed inside the control valve 17 and biased in the direction of shutting off the circuit. A control cam 19 is attached to the ram 13 to press the protrusion 71P of the spool 71 near the raised position of the ram 13 to bring it into communication.

Therefore, each hydraulic cylinder 27
The lowered state is maintained until the ram 3 returns upward to near the raised position, and returns to the original state only when the ram 13 reaches near the raised position. Therefore, the plates separated by shearing are
It falls at the same time as the ram 13 rises,
When the clamping pressure between the ram 13 and the reverse plate pressing member 25 is released, there is a possibility that the plate will not be pushed up by the reverse plate pressing member 25. moreover,
The return of the reverse plate holding member 25 to its original position is carried out by the ram 13.
This occurs after the ram 13 reaches the vicinity of the raised position, and there is a sufficient time difference from when the ram 13 starts rising, so that the plate material is surely dropped and there is no possibility of hindering the plate material from falling. .

1. The present invention is not limited to the above-described embodiments, but can be implemented in other embodiments by making appropriate changes.

[Brief explanation of the drawing]

Fig. 1 is a side view of a shearing machine equipped with a device according to the present invention, Fig. 2 is an enlarged sectional view taken along the - line in Fig. 1, and Fig. 3 is a sectional view taken along the - line in Fig. 2. , FIG. 4 is an explanatory diagram of the hydraulic circuit. Explanation of symbols representing main parts of the drawing, 7...
Table, 9...Lower blade, 11...Upper blade, 13...
Ram, 17... Control valve, 19... Control cam, 25
... Reverse plate holding member, 27 ... Fluid pressure cylinder, 7
1...Spool.

Claims (1)

[Scope of utility model registration request] An upper blade 11 that shears the plate material W in cooperation with a lower blade 9 provided on the rear surface of the table 7 and extending in the left-right direction.
A plurality of reverse plate pressing members 25 arranged continuously in the left and right direction along the rear surface of the lower blade 9 are used as a reverse plate holding device for a shearing machine including a ram 13 that is vertically movable. The inverse plate holding members 25 are provided facing the blade 11 and are connected to each other so as to be rotatable in the vertical direction, so that the respective inverse plate holding members 25 are movable up and down and freely tiltable along the inclination of the upper blade 11. A plurality of fluid pressure cylinders 27 that are provided and urge each reverse plate presser member 25 upward are connected to each reverse plate presser member 2.
In the circuit 53 connecting each fluid pressure cylinder 27 and the pressure source P, a control valve 17 is disposed corresponding to the control valve 17 in which a spool 71 that can freely connect and disconnect the circuit 53 is biased in a direction to disconnect the circuit 53. The projecting portion 7 of the spool 71 is provided near the raised position of the ram 13.
A reverse plate presser device for a shearing machine, characterized in that the ram 13 is provided with a control cam 19 that presses 1P to bring the control valve 17 into a communicating state.