JPS6338021Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Field of Industrial Application This invention relates to a clamping device that clamps and fixes the side edge of metal sheet in a punching machine or the like, and is movable.

(2) Prior art When performing a required number of holes or other processing operations on a metal plate, etc., it is necessary to firmly support and fix the metal plate, that is, a sheet metal. A clamping device that hydraulically clamps the edges may be used.

In a conventional clamp device of this type, as shown in FIG. 1, a clamp support part 40 is fixed,
It consists of a clamp claw that moves up and down from the clamp support part 40 by a hydraulic device provided below the clamp support part 40. At the tip of the clamp claw, there are gripping parts 2, 2' that grip the side edge of the sheet metal 1.
The gripping portions 2, 2' had a smooth cross-sectional shape and were in pressure contact with the front and back surfaces of the sheet metal 1.

(3) Problems to be solved In the conventional clamp device, as mentioned above, the sheet metal 1 is held by the gripping parts 2 and 2'.
2', the hydraulic pressure is dispersed on the contact surface, and when a machining operation is applied to the sheet metal 1, a deviation occurs in the surface contact, causing the side edge of the sheet metal 1 to shift as shown in Fig. 2. There was a problem in that sagging 3, 3' occurred in the cross-sectional direction of the plate, making it impossible to maintain high precision in sheet metal processing.

Furthermore, because conventional clamping devices are fixed at a certain location, each time a workpiece such as sheet metal is clamped, it must be manually moved in the length direction, which is extremely time-consuming. Ta.

(4) Purpose The purpose of this invention is to solve the above problems in view of the above circumstances, and to achieve high precision in various machining operations such as drilling on sheet metal held by a clamp device. The object of the present invention is to provide a clamping device that has a means for strongly clamping and fixing sheet metal, and that can be easily moved in the longitudinal direction of a workpiece.

(5) Means for solving the problem The clamping device of the present invention is an improved version of the conventional clamping device, and consists of a movable table that moves in the length direction of the workpiece, and a movable table that moves in the length direction of the workpiece. A guide rod suspended and fixed above, a clamp support part that engages with the guide rod, a clamp claw that moves up and down from the clamp support part by a hydraulic device provided below the clamp support part, and a tip of the clamp claw. , characterized in that it includes a gripping part that protrudes oppositely to each other and has a protrusion with a chevron-shaped cross section, and a regulating device that locks and fixes the clamp support part in a predetermined position. It is.

(6) Function The clamp device of the present invention is movable in the length direction of the workpiece, and the cross-sectional shape of the gripping part of the clamp claw is chevron-shaped. It can be moved freely in the length direction and clamped with even stronger clamping force.

(7) Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

Fig. 3 is different from Fig. 1 which shows a conventional clamping device, in which the clamping device of the present invention is installed so that it can be moved in the longitudinal direction of the workpiece on a guide rod suspended and fixed on a movable table that moves in the longitudinal direction of the workpiece. FIG.

In FIG. 3, a clamp support 4 is engaged with a guide rod 6 which is suspended and fixed on a movable table 5 which moves in the longitudinal direction of a workpiece, for example a sheet metal 1. 7
8 is a round bar-shaped rail that engages with the movable base 5, 8 is a roller provided on the side surface of the movable base 5, and 9 is an angle-shaped base that fixes the rail 7 and supports the roller 8 in a freely rolling manner. A clamp support 40 that engages with the guide rod 6, a clamp claw 41 that moves up and down from the clamp support 40, a hydraulic device 42 that moves the clamp claw 41 up and down, and a clamp support 4.
0 at a desired position. 44 is a cylinder, 45 is a piston, 46 is a plunger with the clamp claw 41 pivoted on its upper end, 47 is a return spring, 48 is a pressure oil passage, 49 is an air vent hole, 50 is a guide rod for the clamp claw 41, and 51 is a seal. Patsukin, 52 is guide rod 6
A needle 52' that advances and retreats into a circumferential groove 53 carved in the
54 is its operation knob, and 54 is a pressing spring. Circumferential groove 5
3 are provided on the guide rod 6 at predetermined intervals.

Therefore, the tips of the clamp support part 40 and the clamp claw 41, that is, the gripping part of the sheet metal 1, are not made smooth as in the conventional case, but as shown in detail in FIGS. 5, 6, and 7. Protrusions 55, 55' are formed on the sides. This protrusion 55 has a chevron-shaped cross section, has a certain length, and faces a protrusion 55' formed in substantially the same manner. Both ends of the protrusion 55' have hem portions with slightly arched surfaces to increase withstand pressure. The tips of the gripping portions including these protrusions 55, 55' are hardened (see the double hatched section in FIG. 3).

According to the clamp device having such projections 55, 55', as shown in FIG.
5, 55' digs in, leaving bite marks 56, 5 in the cross-sectional direction.
Since it is fixedly supported to the extent that 6' is formed, even if sag 3, 3' occurs, the machined surface itself will not shift from the clamp device.

Next, the operation of the clamp device of the present invention will be explained. A movable base 5 engaged with the rail 7 is moved by a drive device (not shown) along a round bar-shaped rail 7 in the length direction of a workpiece, for example, a sheet metal 1, that is, in a direction perpendicular to the plane of the paper. Stop at the clamp point. Then, when the knob 52' of the regulating device 43 is pressed,
While pressing the spring 54, the tip of the needle 52 jumps into the circumferential groove 53 of the guide rod 6, and the clamp support part 40 is positioned. Next, when hydraulic pressure is applied from the pressure oil passage 48, the hydraulic system 42 acts, and the piston 45 is pushed from above inside the cylinder 44, so that the side edge of the sheet metal 1 inserted into the clamp claw 41 is As shown in FIG. 4, the protrusions 55 and 55' having chevron-shaped cross sections at the tips of the clamp claws 41 are firmly fixed and supported to such an extent that bite marks 56 and 56' are formed in the cross-sectional direction. Therefore, even if sagging 3, 3' occurs, the machined surface itself is clamped without being displaced from the clamping device at all. When unclamping, it is sufficient to perform the above-mentioned clamping operation in the reverse order, so a description thereof will be omitted.

(8) Effects of the invention According to the invention described above, the side edge of the sheet metal is gripped from the upper and lower cross-sectional directions by the gripping part whose cross section is chevron-shaped. As shown in the figure, since the sheet metal is firmly fixed and supported by biting, it will not shift at all even if sag occurs as in the conventional method, and the position of the sheet metal will be maintained even against vibrations and shocks during drilling. It never shifts.

Moreover, since the clamp support part is also positioned by a regulating device, it is completely impossible for the clamping part to shift.

Because it is firmly fixed and supported, and the position of the gripping part does not shift, processing operations such as drilling can be performed with higher precision than before, and work errors are completely eliminated, improving work efficiency. improved,
Furthermore, productivity is further increased, which in turn leads to lower product costs.

In the clamping device of the present invention, the movable base can be moved along the length of the workpiece along the rail, so it can easily handle the size or length of the workpiece such as sheet metal. Moreover, the clamp position can be easily changed.

Since the gripping part of the present invention is hardened, it is highly durable, rarely gets damaged, and has a long service life.

In the case of the present invention, the clamp support portion is effectively positioned by the restrictor.

Furthermore, it goes without saying that the present invention can be used not only for sheet metal clamps, but also for devices having supporting parts to be clamped.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a conventional clamping device;
Fig. 2 is a sectional view of the sheet metal showing the state after the sheet metal is clamped at the tip of the clamping part, Figure 3 is a longitudinal sectional view showing the clamping device of the present invention, and Figure 4 is the clamping part. A vertical cross-sectional view of the sheet metal showing the state after the sheet metal is gripped at the tip, FIG. 5 is a partially omitted front view, and FIGS. 6 and 7 are a vertical cross-sectional view and a partial front view showing the protrusion. be. 1... Sheet metal, 2, 2'... Engagement part, 3, 3'...
Sag, 4...Clamp support part, 5...Movable base, 6
...Guidance rod, 7...Rail, 8...Roller,
40...Clamp support part, 41...Clamp claw,
42...Hydraulic device, 43...Restrictor, 44...Cylinder, 47...Return spring, 48...Pressure oil path, 4
9... Air vent hole, 50... Guide rod, 52...
...Needle, 55,55'...Protrusion, 56,5
6'...Bite mark.

Claims (1)

[Scope of utility model registration request] A movable base that moves in the length direction of the workpiece, a guide rod suspended and fixed on the movable base, a clamp support that engages with the guide rod, and a hydraulic device provided below the clamp support. A clamp pawl that moves up and down from the clamp support part, a gripping part that protrudes oppositely at the tip of the clamp pawl and has a protrusion with a chevron-shaped cross section, and the clamp support part is placed in a desired position. A clamp device characterized by comprising a restriction device for locking and fixing.