Method for machining cutter and dedicated mold

Abstract

The invention discloses a method for machining a cutter. The machining method comprises the following steps: heating a section of high-speed tool steel bar stock of which the diameter is equivalent to that of the rod part of a molded cutter to the temperature suitable for forging, placing the section of the high-speed tool steel bar stock into a dedicated mold cavity which has the same shape with the molded cutter for forging, demoulding the high-speed tool steel bar stock after molding, and further performing finish-milling and finish-grinding on the molded cutter. The invention also provides a dedicated mold used in the machining method. The dedicated mold consists of an upper mold, a lower mold and a mold sleeve, wherein the upper mold is cylindrical; the mold cavity of the lower mold is in the same shape with the main body of the molded cutter, and the lower mold is in the shape of a cone which is small at the top and large at the bottom; the inner wall of the mold sleeve is in clearance fit with the outer walls of the upper mold and the lower mold; the upper mold can slide up and down freely at the upper section of the mold sleeve. The method is suitable for machining various metal cutting tools. By adopting the method, the consumption of the bar stock is low, the milling and grinding workload is little, the rate of finished products is high, the quality of the molded cutter is better, and the service life of the mold cutter is longer; the dedicated mold is simple in structure, work piece is easily formed when in forging, moreover, the distribution of stress is uniform, and the withdrawal from the mold is convenient.

Description

technical field [0001] The invention relates to a processing method of a metal cutting tool, and at the same time relates to a forging die, especially a forging die of a cutting tool. Background technique [0002] At present, the processing method of metal cutting tools is to first turn and mill the high-speed tool steel bar to make it into the designed shape, then undergo quenching treatment, and finally carry out precision grinding and forming. Usually, a formed tool needs 1.5-2.2 times the amount of bar material, and the man-hours for turning, milling, grinding, and quenching are also more, and waste products are unavoidable during quenching. Therefore, the overall processing cost is high and the processing efficiency is high. Low. In addition, because the carbide level of the existing high-speed tool steel bar is good on the surface and poor on the core, the metal grains closer to the core are less dense than the surface, and in the forming process of the tool, turning,...

AI Technical Summary

Problems solved by technology

Usually, a formed tool needs 1.5-2.2 times the amount of bar material, and the man-hours for turning, milling, grinding, and quenching are also more, and waste products are unavoidable during quenching. Therefore, the overall processing cost is high and the processing efficiency is high. Low

In addition, because the carbide level of the existing high-speed tool steel bar is good on the surface and poor on the core, the metal grains closer to the core are less dense than the surface, and in the forming process of the tool, turning, milling, grinding What is lost is the dense part of the bar close to the outer carbide, leaving the edge of the blade as the tooth, but the part with poor carbide grade. Moreover, the chip flute produced by turning, milling and grinding also caused the overall damage of the tool. Inhomogeneous strength, therefore, the forming tool processed according to the prior art is easy to bend, chip and break

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