Clamp used for machining eccentric shaft

Abstract

The invention relates to a clamp used for machining an eccentric shaft. The clamp comprises a numerical control main shaft, a pressing block, a sliding block base coaxially connected with the numerical control main shaft and a sliding block arranged on the sliding block base, the eccentric shaft is tightly pressed on the sliding block through the pressing block, and the axial direction of the eccentric shaft is parallel to the axial direction of the numerical control main shaft; position-limiting pins used for limiting the sliding distance of the sliding block are arranged on the sliding blockbase and arranged at the two ends of the sliding stroke of the sliding direction of the sliding block sliding in a reciprocating mode, the displacement of the sliding block sliding from the position-limiting pin on one end to the limiting pin sliding on the other end is equal to the distance from the center of the outer diameter of the eccentric shaft to the center of the inner hole of the eccentric shaft; and the clamp further comprises a tensioning mechanism, wherein the tensioning mechanism is arranged in the numerical control main shaft in a sleeving mode, and one end of the tensioning mechanism penetrates through the sliding block base and extends to the sliding block. According to the clamp, only one clamping is needed in the machining process of the eccentric shaft, the eccentric shaft moving up and down on the plane of the sliding block base is achieved through the locking and loosening of the sliding block controlled by a numerical control pulling rod, and thus a fact that machining error of the clamp has no relationship with the machining is guaranteed, and the parallelism and precision of the outer diameter and the inner hole are improved.

Description

technical field [0001] The invention relates to a fixture, in particular to a fixture for machining eccentric shafts. Background technique [0002] The eccentric shaft is a workpiece whose outer circle is parallel to the axis of the inner hole and does not overlap. The eccentric shaft used on the air pump is mostly an assembly bearing. The outer circle is usually used to connect the connecting rod piston, and the inner hole is usually sleeved on the output of the motor. On the shaft, when the motor rotates at high speed, the connecting rod is driven to reciprocate rapidly due to the difference in the center of the circle. At this time, the bearing is subjected to high-speed and radial impact force. If the output shaft of the motor is not parallel to the bearing, the bearing will swing at a high speed , making the bearing uneven, causing irregular wear and greatly reducing the service life of the bearing. [0003] The common processing method is relatively complicated. The o...

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Problems solved by technology

[0002] The eccentric shaft is a workpiece whose outer circle is parallel to the axis of the inner hole and does not overlap. The eccentric shaft used on the air pump is mostly an assembly bearing. The outer circle is usually used to connect the connecting rod piston, and the inner hole is usually sleeved on the output of the motor. On the shaft, when the motor rotates at high speed, the connecting rod is driven to reciprocate rapidly due to the difference in the center of the circle. At this time, the bearing is subjected to high-speed and radial impact force. If the output shaft of the motor is not parallel to the bearing, the bearing will swing at a high speed , so that the bearing is unevenly stressed, causing irregular wear and greatly reducing the service life of the bearing

[0003] The common processing method is relatively complicated. The outer diameter is processed first, and then the inner hole is processed with a jig for positioning the outer diameter, resulting in multiple clamping, the cumulative error of machining is large, and the accuracy of the jig is difficult to guarantee, resulting in a low pass rate of the product; there are also Through turning and milling center processing, one-time processing and forming, but the disadvantages are obvious, the machine tool is relatively expensive, the processing time is long, the cost is too high, and there is no economic efficiency

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