Combined machining method suitable for threaded hole of hard alloy cutter bar

Abstract

The invention discloses a combined machining method suitable for a threaded hole of a hard alloy cutter bar. The combined machining method sequentially comprises the following steps that 1, a threaded bottom hole is machined in the hard alloy cutter bar in a laser or electric spark machining manner; 2, an external thread is machined on the copper rod as an electrode; and 3, the electrode is installed on a main shaft of an electric spark forming machine tool, the hard alloy cutter bar is installed on a workbench of the electric spark forming machine tool, the electrode is driven by the main shaft to horizontally move in a horizontal plane formed by an X axis and a Y axis, an internal thread is machined in an electric spark machining manner, and a horizontal movement track is a circle concentric with the thread bottom hole. Compared with the prior art, the combined machining method has the advantages that the machining efficiency and machining precision of the threaded hole of the hard alloy cutter bar can be guaranteed, threaded hole machining size errors caused by electrode loss can be avoided, and threaded holes of various diameters can be machined only through one electrode.

Description

technical field [0001] The invention relates to the technical field of processing cemented carbide materials, in particular to a compound processing method suitable for threaded holes of cemented carbide tool rods. Background technique [0002] In recent years, with the development of the machinery industry, the application requirements of high-hardness materials have become more and more extensive, and more and more challenges have been raised for its processing technology. For the field of metal cutting, cemented carbide materials are due to their high Hardness, strength and wear resistance, so that it can be used not only on knives, but also on the tool holder of superhard tools, such as diamond tools or cubic boron nitride tools. The hardness of the tool itself is extremely high. In order to further reduce the Vibration, carbide material becomes the ideal choice for the tool holder. [0003] Since the installation of the superhard material blade needs to be fixed by ope...

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Problems solved by technology

[0003] Since the installation of the superhard material blade needs to be fixed by opening a threaded hole on the carbide shank, the processing of the internal thread of the tungsten carbide shank has always been a technical problem. The traditional internal thread processing methods include tapping and cold extrusion. Forming and milling, but for the carbide tool holder due to its high hardness and small thread hole diameter, it is difficult to use the traditional internal thread processing method normally

Although the inner thread of the cemented carbide tool holder can be formed by special molding, because the compact is still fired, it will eventually produce non-uniform shrinkage, and it is difficult to ensure the size and accuracy of the inner thread of the carbide tool holder after shrinkage. Therefore, The processing of the internal thread of the carbide tool holder can only be completed by subsequent processing

[0004] EDM internal thread is generally realized through the rotation and translation of the spindle with electrodes, mainly through axial helical screwing, the processing efficiency is low during the processing, and the electrode loss will also affect the machining accuracy of the internal thread

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