JPS62282871A - Machine vice - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention The present invention relates to a machine vise for always correctly gripping a workpiece and efficiently performing ultra-high precision machining.

The present inventor has previously proposed machine vises described in Japanese Patent Publication No. 59-46745 and Japanese Patent Publication No. 60-23950, but the present invention aims to tighten workpieces more accurately than this technique.

That is, in conventional machine vises having a structure in which a stress transmission frame is provided inside the main body, it is known that when a workpiece is strongly tightened, the fixed jaws tilt toward the movable jaws by several micrometers.

This value poses no problem in normal machining, but
Recently, there has been a demand for an accuracy of 1μ. For this purpose, the inclination of the fixed jaw when tightening the workpiece is 1 μm.
There is a need, and the present invention has been developed to meet these needs.

Conventionally, when considering how the fixed jaws of this type of machine vise are cumbersome, when a workpiece with two parallel surfaces is tightened with a weak force, the inclination of the fixed jaws is close to zero; On the other hand, if you tighten it too hard, it will tilt a few microns toward the movable jaw. This means that only the M vibration force between the movable jaw and the sliding surface of the main body can be applied to the fixed jaw by the stress transmission frame.
This is thought to be due to the fact that the workpiece is being pulled to the side, and it is also thought to be caused by elastic deformation of the clamped parts of the workpiece depending on the stress distribution.

By the way, the movable jaw tilts in proportion to the clamping force, but if a force in the opposite direction is generated in proportion to the clamping force, it will not tilt. Therefore, in the present invention, an elastic adjustment rod is attached. The configuration creates forces in opposite directions.

At this time, the tightening force is adjusted by the material, length, cross-sectional area, etc. of the elastic adjustment rod.The material and length are determined by the amount of deformation above the position of the elastic adjustment rod in the stress transmission frame. becomes. On the other hand, there are vises that have a large amount of deformation and have high jaws, but they use long elastic adjustment rods. On the other hand, the cross-sectional area of the elastic adjustment rod is determined through experiments; if this cross-sectional area is too large, the fixed jaw will tilt in the direction opposite to the movable jaw; on the other hand, if the cross-sectional area is too small, the fixed jaw will tilt toward the movable jaw. It will be tilted.

Hereinafter, an example of the cannon of the present invention will be explained based on the accompanying drawings. Figure 1 is a plan view of the entire device, Figure 2 is a front view of the entire device,
Figure 3 is a sectional view taken along line A-A in Figure 1, and Figure 41 is F in Figure 3.
-Z'J@ side view, FIG. 5 is an enlarged sectional view of the elastic adjustment rod portion, and FIG. 6 shows another embodiment.

Reference numeral 1 denotes a main body of the device, and a movable jaw 2 advances and retreats on a sliding surface D on the fixed jaw IC side of the main body by a screw 4 that is a moving member. After fixing, the IC and movable jaw 2 are conveniently fixed with bolts to the quenched and polished caps IB and 2B.

Reference numeral 3 denotes a U-shaped stress transmission frame, one end of which is fixed to the upper part of the fixed jaw IC with a set screw IP, so that it does not fall off from the main body 1, and which moves in the forward and backward direction of the movable jaw 2. It is fastened so that there is no play. On the other hand, the other end is not drilled with a circular hole 3A with a circumferential M that allows several layers of convex IEs provided on the main body l side, and the stress transmission frame 3 has an elastic adjustment rod. The intermediary body 1 is designed to prevent it from falling off or moving upwards.

Reference numeral 5 denotes an elastic adjustment rod, one end (tip end) of which touches the bottom of the oval hole 3A drilled in the stress transmission frame 3, and the other end (rear end) of which has a male thread I carved within a certain length range. This is screwed onto a female thread 1 of a through hole 6 formed on the side of the main body 1, and is locked using a lock nut 5B outside the main body 1. In addition, 20 in the drawing is the movable jaw 2.
This is a guide member provided on the lower surface of the.

Now, when the workpiece is tightened between the ferrules IB and 2B, the stress transmission frame 3 is deformed and compressive stress is generated in the elastic adjustment rod 5, which generates a force in the opposite direction that is proportional to the tightening force. Therefore, when the workpiece is removed, the stress transmission frame 3 is no longer deformed and the stress on the elastic adjustment rod 5 is also eliminated, and the force is a force in the opposite direction proportional to the tightening force. .

FIG. 6 shows another example in which a long elastic adjustment rod is used, and the elastic adjustment rod 51 is inserted through a through hole 6' formed in the main body 1 and extends outward from the main body 1. It is made to protrude by a certain length. 7 is an elastic crown body for pressing this from the outside, and a circular hole 7At-with an inner diameter slightly larger than the diameter of the elastic adjustment rod 51 is bored inside. Bolt holes 7B are drilled at four surrounding locations, and bolts 8 are screwed into the main body 1 so that they are fixed. At this time, elastic adjustment rod 5
1 is in contact with the bottom of the circular hole 3A drilled in the stress transmission frame 3, as in the previous example, and the depth 2 of the circular hole 7A of the elastic crown body 7 is such that the elastic adjustment rod 51 It is made to the exact dimensions for cooking.

The present invention is constructed as described above, and since the elastic adjustment rod 5.5' is constantly in contact with the stress transmission frame 3 from the fixed main body 1 side, the elastic adjustment rod 5.5' is adjusted according to the tightening force. Compressive stress is then generated, which becomes a force in the opposite direction proportional to the clamping force, so as to prevent deformation of the stress transmission frame 3 as much as possible.

In carrying out the present invention, it is possible to arrange a plurality of cylinders of manpais in parallel to form an integrated main body, or to drive the movable body by hydraulic pressure or to use a toggle mechanism. The apparatus of the present invention makes it possible to perform accurate processing of 1 μm or less, which was previously considered impossible, by adding a simple improvement to the conventional apparatus.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the entire device, Fig. 2 is a front view of the same, Fig. 3 is a sectional view taken along the line A-A in Fig. 1, Fig. 4 is a sectional view taken along the line FF in Fig. 3, and Fig. 5 is a sectional view taken along the line A-A in Fig. 1. The figure is an enlarged sectional view of the elastic adjustment rod portion, and FIG. 6 shows another embodiment.

Claims (1)

[Claims] (1) A machine vise that clamps a workpiece using a fixed jaw and a movable jaw that moves forward and backward toward the fixed jaw, and inside the main body on which the movable jaw rests, a member that drives the movable jaw forward and backward is located at one end of the stress transmission frame. In a machine vise having a structure in which a fixed jaw is fitted into the other end of the machine vise, an elastic adjustment rod is inserted between the end of the stress transmission frame on the forward/backward driving member side and the main body in the longitudinal direction of the main body, and one end of the elastic adjustment rod is inserted into the main body. Attach to the side,
A machine vise characterized in that the other end is provided so as to abut against a stress transmission frame side.