Eccentric two-point edge finder

Abstract

The invention relates to an eccentric two-point type edge finder, belongs to the field of machining and aims at providing the eccentric two-point type edge finder which improves the measurement accuracy and can enable that metal contacts can eccentrically rotate around the axis of a spindle after making contact with a machined workpiece. The eccentric two-point type edge finder comprises a shaft, a fixing part, the first metal contact and the second metal contact. The fixing part comprises a machine tool connecting section and a contact mounting section. The shaft is mounted on the top of the machine tool connecting section. The first metal contact and the second metal contact are fixed to the bottom of the contact mounting section. An auxiliary plane is formed by the axis of the first metal contact and the axis of the second metal contact. The orthogonal projection of the axis of the shaft in the auxiliary plane is located on the outer side of the axis of the first metal contact. Clamping errors and manufacturing errors of the eccentric two-point type edge finder can automatically be offset. Meanwhile, measurement errors are eliminated, and the measurement accuracy is improved. Moreover, the eccentric two-point type edge finder does not shut down in time after the metal contacts both make contact with the machined workpiece, and the metal contacts continue rotating around the shaft. The metal contacts are protected against damage caused by extrusion of the workpiece.

Description

technical field [0001] The invention belongs to the field of machining, in particular to an eccentric two-point edge finder. Background technique [0002] The edge finder is a detection tool for accurately determining the center position of the workpiece to be processed in CNC machining. Edge finders mainly include mechanical eccentric edge finder, photoelectric edge finder and 3D edge finder. However, during the measurement process of mechanical eccentric edge finder and photoelectric edge finder, it cannot be guaranteed that the edge finder will be used every time. If the same part is in contact with the workpiece to be processed, the clamping error and manufacturing error cannot be eliminated, and the detection accuracy is low. The 3D edge finder eliminates the above defects, but it needs to be debugged before use, and the production cost is high. [0003] The Chinese patent application with the application number CN201510345244.8 discloses a two-point 3D edge finder, i...

AI Technical Summary

Problems solved by technology

Edge finders mainly include mechanical eccentric edge finder, photoelectric edge finder and 3D edge finder. However, during the measurement process of mechanical eccentric edge finder and photoelectric edge finder, it cannot be guaranteed that the edge finder will be used every time. The same part is in contact with the workpiece to be processed, and the clamping error and manufacturing error cannot be eliminated, and the detection accuracy is low

The 3D edge finder eliminates the above defects, but it needs to be debugged before use, and the production cost is high

However, the No. 1 elastic piece and the No. 2 elastic piece make the No. 1 metal contact and the No. 2 metal contact flexible, and it cannot be guaranteed that when the machine tool is recording, the No. 1 metal contact and the No. 2 metal contact are just in contact with the workpiece. The No. 1 elastic part and the No. 2 elastic part are in a normal state without deformation, and the horizontal deformation of the No. 1 elastic part and the No. 2 elastic part cannot be guaranteed to be the same. It is not easy to control the measurement error, which will eventually affect the measurement accuracy of the edge finder

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