Carburizing steel for mandrel with low expansion coefficient and preparation process thereof

Abstract

The invention belongs to the field of industrial preparation, and particularly relates to carburizing steel for a mandrel with the low expansion coefficient and a preparation process thereof. The carburizing steel is mainly used for manufacturing a mandrel of a machine tool spindle. The steel comprises the following components and elements including, by mass, 0.08 to 0.20 percent of C, 0.5 to 1.5 percent of Cr, 0.3 to 0.8 percent of Mn, 1.5 to 4.5 percent of Mo, 0.2 to 0.5 percent of Si, 0.7 to 2 percent of V, 0.5 to 5 percent of Co and the balance Fe. Casting ingots with components meeting requirements are smelted through an electric furnace; and in order to guarantee compactness and structure uniformity, the casting ingots are forged before use, and heat treatment is carried out after forging. According to the carburizing steel, by reducing the content of the C element, increasing the content of the Mo element and reducing the thermal expansion coefficient of materials, it is guaranteed that the materials have small thermal elongation in the service process; and the V and Co elements are added, so that the material strength is improved, the thermal expansion coefficient is reduced, and the carburizing steel for the mandrel with the low expansion coefficient is obtained.

Description

technical field [0001] The invention belongs to the field of industrial preparation, in particular to a carburized steel for a low expansion coefficient mandrel and a preparation process thereof, which is mainly used for manufacturing the mandrel of a machine tool main shaft. Background technique [0002] Machine tool spindle is the key core component of CNC machine tool equipment. The precision and dimensional thermal stability of the spindle seriously affect the machining accuracy of the machine tool. The dimensional thermal stability of the spindle is related to the thermal expansion of the spindle material during service. At present, CNC machine tools generally have the problem of thermal extension. During the service process of the spindle, the internal temperature of the spindle increases due to the high-speed rotation of the spindle bearing and the heat generated by the built-in motor, which in turn causes thermal expansion and deformation of the spindle. The thermal ...

AI Technical Summary

Problems solved by technology

At present, the problem of thermal extension is common in CNC machine tools. During the service process of the spindle, the internal temperature of the spindle increases due to the high-speed rotation of the spindle bearing and the heat generated by the built-in motor, which in turn causes thermal expansion and deformation of the spindle.

The thermal extension of the spindle has a great influence on the machining accuracy of the machine tool, affecting the positioning of the machine tool head, resulting in a decrease in the machining accuracy of the machine tool

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