Method for machining male mould of flywheel extrusion mould

Abstract

The invention discloses a method for machining a male mould of a flywheel extrusion mould, aiming at providing the machining method capable of improving the segregation distribution of the carbide in the mould, preventing the mould from being invalid, and improving the service life of the mould. The method comprises the steps of: forging, wherein the heating temperature is 1100-1150 DEG C, the heat preservation time is 0.8-1.2 min / mm, the initial forging temperature is 1040-1080 DEG C and the finish forging temperature is 850-900 DEG C, and embedding in a cooling way with sand ash; annealing forged mould material; slowly heating the mould material at 840-860 DEG C; preserving temperature for 4 h; opening a furnace door and reducing the temperature at 740-760 DEG C; preserving temperature for 6 h; cooling the furnace at 550 DEG C; putting the material out of the furnace and cooling in air; mechanically machining the processed mould material to obtain the male mould of the flywheel extrusion mould; and quenching the male mould of the flywheel extrusion mould and tempering at three times to obtain a final product. The method crushes the carbide in a forging way, promotes the carbide to be evenly distributed, improves the segregation distribution of the carbide in the mould, and prolongs the service life of the mould.

Description

technical field [0001] The invention relates to a processing method of a punch of a flywheel extrusion die made of W6Mo5Cr4V2 high-speed steel. Background technique [0002] At present, the material used for the punch of the extrusion die of the flywheel is W6Mo5Cr4V2 high-speed steel, referred to as 6-5-4-2 die steel. In production, the failure of the punch of the flywheel core extrusion die often occurs, which greatly increases the production cost of the company. [0003] After analysis, it was found that the cause of the failure of the punch of the flywheel core cold extrusion die came from the die material and the use condition. The current mold processing method is that the mold material is directly machined into a mold, and then quenched and tempered twice. At present, there are mainly two forms of extrusion die punch failure: cross-cutting and local block dropping. After a lot of tests and analysis, it was found that: since 6542 die steel belongs to ledeburite stee...

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Problems solved by technology

At the same time, it will also make the distribution of carbon and alloying elements in the matrix uneven, and the content of alloying elements in the carbide-rich place is high, which is prone to insufficient tempering and increases brittleness, while the place where carbides are scarce is caused by the lack of carbon and alloying elements. Hardness and Yield Strength Decrease

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