Rectangular spring tool rest holding device

Abstract

A rectangular spring tool rest holding device comprises a main shaft and a tool rest. The tool rest is installed in a tapered hole of the main shaft. A pull rod is installed in the main shaft, and a pop-rivet and a steel ball are installed between the pull rod and the tapered hole. The rectangular spring tool rest holding device is characterized in that the pull rod is sleeved with a rectangular spring, the section of the rectangular spring is rectangular, and the difference between the inner diameter of the rectangular spring and the outer diameter of the pull rod is smaller than 0.05 mm. According to the rectangular spring tool rest holding device, the pull rod is sleeved with the rectangular spring, the rectangular spring is long in service life, high in bearing capacity and capable ofbeing arranged in a relatively small space, the clearance between the inner diameter of the rectangular spring and the outer diameter of the pull rod can be more easily made to the minimum limit due to the rectangular section, vibration can be restrained better, the center of gravity is stable, and the offset-allowable clearance is the minimum.

Description

technical field [0001] The invention relates to a clamping mechanism of a high-speed drilling and tapping center machine tool, in particular to a clamping device for a rectangular spring tool holder. Background technique [0002] The high-speed rotation of the spindle of the drilling and tapping center machine tool drives the tool to perform cutting through the clamping mechanism set on the tool holder inside the spindle. The vibration generated by the high-speed rotation of the spindle will affect the machining accuracy. The clamping and loosening of the tool holder will cause irregular wear on the contact surface between the tool holder and the spindle, making it difficult to ensure that the axes of the tool holder and the spindle are on the same line, and the machining accuracy will be reduced. ; Multiple compressions and rebounds of the spring will gradually reduce the bearing capacity and life of the spring, and the direction of spring force will deviate, further increa...

AI Technical Summary

Problems solved by technology

[0003] At present, the tool holder clamping mechanism on the market releases and clamps the tool holder through butterfly springs, which can be set in a small space and has strong enough elastic force, but also has the following defects: the gap between multiple butterfly springs There is a difference in the telescopic stroke, so that there is too much stress locally, which affects the service life; the butterfly spring will have greater friction when sliding on the pull rod, which is not conducive to stretching and rebound

However, due to the double-spring structure, the pitch must be increased, and the load-bearing capacity of a single spring is reduced. The two springs cannot be of the same length and load-bearing capacity, which will always lead to uneven force, with more force on one side and force on the other less, the tension on the tool holder is not balanced, and it is impossible to provide equal elastic force, and it is impossible to ensure that the two springs are radially concentric during processing. Inner and outer diameter errors are unavoidable, resulting in positioning deviations, and it is difficult to eliminate the inconcentricity of the inner and outer diameters during processing. It is even more difficult to achieve the coaxiality of the two springs after assembly. In this way, the effect of finishing in the patented design is greatly reduced. Moreover, the two springs need to be arranged symmetrically at 180° during the assembly process, which can only be observed with the naked eye and cannot be accurate. In the process of locking the screw, with the rotation of the nut, the contact end surface will inevitably deflect at a certain angle under the action of friction, and it is impossible to achieve the ideal symmetrical distribution in design, which will cause certain problems during the high-speed rotation of the spindle. The impact of the pull rod is easy to cause impact, which will increase the wear and tear, and will also increase the noise and cause greater vibration

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