JPH0123275B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a clamp device, and more particularly to a clamp device in which a clamp for clamping and tightening a workpiece can be moved in the vertical direction.

[Technical background and problems of the invention]

Generally, when various types of machining are performed on a workpiece, the workpiece being worked on is fixed using a clamping device called a vise. There are two types of clamping devices: one that clamps the workpiece between a fixed clamp and a movable clamp, and another that clamps the workpiece between clamps that are both movable. All of these workpiece clamping devices cannot move the clamp in a direction perpendicular to the direction of movement of the clamp. For this reason, if the workpiece has protrusions protruding from the clamping surface, or if the workpiece is T-shaped and the intersection of the flange and the web forms an acute angle, it is impossible to clamp the vicinity of the web as it is. It was necessary to insert a spacer block.

[Purpose of the invention]

The present invention solves the problems of the above-mentioned prior art, and provides a clamping device in which a pair of clamps can be moved toward and away from each other symmetrically with respect to the center, and the clamps can be moved in a direction perpendicular to the tightening direction. The purpose is to

[Summary of the invention]

In the present invention, a pair of tightening frames are screwed together with a right-handed screw and a left-handed screw that are formed symmetrically with respect to a neutral position, and first and second clamping frames are provided on opposite front surfaces of the tightening frame and can slide vertically along a member. This device is characterized in that two holders are mounted, and a clamp with an acute narrow angle between the front surface and the top surface is disposed inside the holder.

[Embodiments of the invention]

Embodiments of the clamp device according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a slide, and a first tightening frame 2 and a second tightening frame 3 are placed on this slide 1 so that they can approach and separate symmetrically with respect to a neutral plane 4. . Nuts 5 and 6 are integrally protruded from the lower surfaces of these tightening frames 2 and 3, and nut 5 has a left-handed female threaded hole, while nut 6 has a right-handed female threaded hole. is formed. A clamp screw 9 having a left-hand thread 7 and a right-hand thread 8 formed at symmetrical positions with respect to the neutral plane 4 is screwed into these nuts 5 and 6.

A guide 10 having a dovetail cross section extends vertically on the vertical front surface 2a of the first tightening frame 2, and a first holder 11 that is slidable in the vertical direction is attached to the guide 10. are slidingly connected. This first holder 11 is moved up and down by hydraulic drive, and in the illustrated example, a hydraulic cylinder 12 is fixed on the first clamping frame 2, and a piston rod at the end of a piston 13 reciprocates within this hydraulic cylinder 12. 14 is coupled to the first holder 11. The first holder 11 has an angular shape, and the first clamp 15 is held inside the first holder 11. This first clamp 15 has a front surface 15a and a top surface 15.
It is constructed so that the included angle with b is an acute angle, and its apex is rounded with a small radius.

Similarly, on the vertical front surface 3a of the second tightening frame 3, a guide 20 having a dovetail cross section is vertically extended. A holder 21 is slidably coupled. This second holder 21 is moved up and down by hydraulic drive, and in the illustrated example, a hydraulic cylinder 22
is fixed on the second clamping frame 3, and a piston rod 24 at the end of a piston 23 reciprocating within this hydraulic cylinder 22 is connected to the second holder 21. The second holder 21 has an angular shape, and a second clamp 25 is held inside thereof. This second clamp 25 has a front surface 25a and a top surface 25.
The included angle with b is an acute angle, and the apex is rounded with a small radius.

In addition, in the above embodiment, the clamps 15 and 2
The length in the direction perpendicular to the paper surface of No. 5 can be set to an appropriate dimension as necessary.

Next, a method of using the above-mentioned clamp device will be explained.

FIG. 2 shows an example of a workpiece 30 that is fixed using the clamping device according to the present invention, and is a shaped steel having an A-shaped cross section. This processed product 30 consists of a web 30a and a flange 3b, one of which is an acute angle and the other is an obtuse angle. To clamp such a workpiece 30, as shown in FIG. Clamp 15 in the corner space sandwiched between 30b and 30b.
and 25 and tighten it. By sequentially controlling the rotation of the clamp screw 9 and the amount of movement of the pistons 13 and 23, it is possible to guide the clamps 15 and 25 along a predetermined path to the tightening position. FIG. 4 is an explanatory diagram showing the approach route of the clamp 15.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, since the clamp that can be moved up and down by the lifting device is mounted on the front of the tightening frame, the clamp can be moved forward and up and down relative to the clamp when tightening the workpiece. A combined motion can be provided, thereby making it possible to clamp workpieces with sharp corner spaces.

Note that the included angle between the top surface and the front surface of the clamp may be set to an appropriate angle depending on the workpiece.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing an embodiment of a clamping device according to the present invention, FIG. 2 is a perspective view showing a mold material to be processed, and FIG. 3 is a front sectional view showing a state in which the mold material is clamped. FIG. 4 is an explanatory view showing another example of how the clamp approaches the workpiece. 2...First tightening frame, 3...Second tightening frame, 9...Clamp screw, 11...First holder, 21...Second holder, 12, 22...Hydraulic cylinder, 15...First tightening Money.

Claims (1)

[Claims] 1. In a clamp device in which a first clamping frame and a second clamping frame are screwed together with the right-hand thread and the left-hand thread of the clamp screw and are moved toward and away from each other, the front surfaces of each of the first clamping frame and the second clamping frame are A first and second holder movable independently in the vertical direction is mounted on the holder, a hydraulic cylinder device for vertically moving the holder is installed between the holder and the tightening frame, and a clamping frame is installed inside the holder. A dovetail groove is formed on the sliding surface of the holder, and this dovetail groove is slidably fitted into a dovetail-shaped dovetail member formed on the side of the tightening frame, and the front and top surfaces of the clamp are A clamping device characterized in that the narrow angle between the two is set at an acute angle.