Method for manufacturing high-vanadium, high-cobalt high speed steel

Abstract

The invention provides a manufacturing method of high-vanadium high-cobalt high-speed steel, wherein, the composition weight percent of the high-speed steel is as follows: 1.1 percent to 2.18 percent of C, 5.0 percent to 8.0 percent of W, 4.0 percent to 6.0 percent of Mo, 3.0 percent to 5.0 percent of Cr, 1.2 percent to 8.3 percent of V, 6.5 percent to 11.5 percent of Co and the rest, Fe; the process steps of the high-speed steel includes master alloy preparation, spray forming, hot forging, quench tempering treatment, turning, milling and grinding or TiN / AlTiN coating treatment. The invention omits working procedures such as powder sieving, blending, encapsulation and cold and hot isostatic pressing, etc. and does not need costly equipment investment; moreover, the performance of the invention reaches to or even exceeds that of powder high-speed steel, thereby saving process cost and reducing the applied cost of the high-speed steel. The invention can be widely used in various cutters such as cutting tools for making difficult-to-machining material, and is particularly suitable to make cutters with quick-cutting, high hot hardness and long service life such as large-size broaching tool, gear shaver, hob and gear shaping tool for machining gear and various milling cutters used in digital control machine tool, etc.; moreover, the invention also can be used in making mould, etc.

Description

technical field [0001] The invention relates to a method for manufacturing ultra-high-alloyed high-speed steel, in particular to a method for manufacturing high-vanadium and high-cobalt high-speed steel, so as to produce cutting tools used in different occasions. Background technique [0002] High vanadium and high cobalt high speed steel is a kind of high alloy steel. People usually adopt powder metallurgy method to produce this kind of steel, such as the high-vanadium high-cobalt high-speed steel disclosed in Chinese Patent Publication No. CN1087358C and CN1156595C, which has uniform structure, no macro-segregation, dispersed carbide and no directionality. It has both toughness and wear resistance, and is widely used in the manufacture of cutting tools for difficult-to-machine materials. It is especially suitable for making tools that require high-speed cutting, high thermal hardness, and long life, such as large broaches, shaving knives, and hobs for processing gears. Ge...

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Problems solved by technology

[0003] However, the process of powder metallurgy is quite complicated, including: melting, atomization, screening, mixed batch, packaging, cold isostatic pressing, hot isostatic pressing, hot forging or hot rolling, unpacking, milling, heat treatment and grinding, etc. Process (C. Spiegelhauer. "Industrial production of tool steels using the sprayforming technology". Proceedings of the 6th International Tooling Conference, Karlstad, Sweden, 10-13 September 2002: 1101~1108.)

During these processes, expensive investment in equipment such as hot isostatic pressing is required, and the size requirements of the atomization device are relatively large, and the yield of powder metallurgy materials is relatively low, and the energy utilization rate is not high. Therefore, the price of powder metallurgy high-speed steel quite expensive