30600N, the force assigned to each clamping rod is 10200N. Since the force point and the force transmitted from the cylinder to the action rod are not in a line, an additional torque may be generated. The fixture diagram is shown in Figure (2): long-term The rod of the indenter is easily deformed by bending, and the pressing force is generated when the pressing head is pressed, so that the actual pressing force is much smaller than the force generated by the cylinder, thereby causing the hole size of the intrusion to be unstable, and The gap between the guide screw and the spiral groove of the indenter is 1mm~2mm. After the indenter is rotated into position, the amplification of the gap causes the position of the pressing point of the indenter to vary greatly, and the pressing width here is only 5mm, the indenter is very close to the hoe, so that the clamping head of the clamping large part has the mark of being smashed by the boring tool. When the machining margin of the big hole of the connecting rod is large, the force generated by the boring is relatively In general, the clearance between the guide screw and the spiral groove of the indenter is relatively large. When the pressing force is reduced, when the punching force of the hammer is large, the pressure head may be shaken around the axis, and the connecting rod may also be shaken. The size of the machined hole is sometimes out of tolerance.

When pressed against the side of the pressing width of only 5 mni, the file is pulled to the side of the indenter due to the inaccuracy of the position.

In order to solve the above two problems, the following measures are adopted, the fixed joint of the indenter becomes a living joint, and it is divided into two parts of a pressing head and a rotating shaft, and the two parts are joined together by a pin, so that the rotating shaft is Only axial forces are applied during clamping. At the same time, the contact surface of the indenter and the connecting rod is modified to be close to the pressing surface of the connecting rod, and the original point contact is changed into a surface contact, the contact surface is increased, the pressing is ensured, and the tail of the indenter is milled out of the V-shaped groove. When the rotating shaft rotates into position and presses against the pressure, the V-groove at the end of the indenter contacts the ball head of the positioning ball-end rod of the clip to determine the position of the indenter, and the anti-pressure head rotates, thus preventing the guide screw from being The influence of the rotation groove gap on the positioning position of the indenter ensures the accuracy of the pressing position of the indenter. The specific structure is shown in (3).

4 guides. Hey!

Figure (2) Improvement of the structure of the front fixture Figure 3. Solution According to the above analysis, we believe that in order to reduce the hole size of the trampoline, the hole size is sometimes too poor, and the hole size of the hole is unstable, which mainly solves two problems. The indenter shaft is only subjected to axial forces and should not be subjected to torque, thereby reducing bending deformation of the indenter shaft. On the other hand, it controls the axial rotation when the ram is pressed to ensure the accuracy of the clamping point, and does not cause the figure (3). The improved structure of the clamp adopts the above structure, eliminating the additional torque of the rotating rod: enabling the ram to Effective positioning and other measures. Thereby, the hidden danger that the size of the pupil of the trampoline is sometimes out of tolerance and the pore size is unstable is eliminated. After half a year of use, there is no trace of the indenter being smashed by the file. The stability of the size of the large hole of the processing link has been greatly improved compared with that before the transformation.

straight

(Finish)

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