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

A technology with low expansion coefficient and preparation technology, which is applied in the field of industrial preparation, can solve the problems of reduced machining accuracy of machine tools, affecting the positioning of machine tool heads, thermal expansion and deformation of spindles, etc., achieves small thermal elongation, reduces thermal expansion coefficient, and improves material strength. Effect

Active Publication Date: 2021-10-29
深圳市国科六点科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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

Examples

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Example Embodiment

[0016] Example 1:

[0017] Table 1 gives an elemental content in Example 1 and the other element content of the present invention and 20 crmo steel in the scope of the invention. Two materials were tested after thermal treatment. Table 2 shows the results of thermal expansion coefficient of the two materials, and the present invention is demonstrated using the MO and V elements to reduce the correctness of the thermal expansion coefficient of the material.

[0018] Table 1. 20CrMo Steel and Chemical Components (Fe Marhe) of Example 1

[0019] (wt.%) C Si Mn Cr Mo V CO 20CRMO 0.20 0.32 0.51 1.03 0.23 - - Example 1 0.14 0.27 0.53 1.05 3.10 0.95 0.71

[0020] Table 2. 20CrMo Steel and Example 1 Hot Expansion Coefficient Detection Results

[0021]

Example Embodiment

[0022] Example 2:

[0023] Table 3 gives an elemental content in Example 2 and the other element content of the present invention and 20 CRMO steel in the scope of the invention. Two materials were tested after thermal treatment. Table 4 shows the core expansion coefficient detection results of two materials, and the present invention is demonstrated to reduce the correctness of the thermal expansion coefficient of material using the MO and V elements.

[0024] Table 3. 20CrMo Steel and Chemical Components (Fe Markets) of Example 2

[0025] (wt.%) C Si Mn Cr Mo V CO 20CRMO 0.20 0.32 0.51 1.03 0.23 - - Example 2 0.10 0.21 0.42 1.35 2.87 1.43 3.98

[0026] Table 4. 20CrMo Steel and Example 2 Heat Expansion Coefficient Detection Results

[0027]

[0028] The results of the present invention showed that the present invention reduces the C element content, improves the moisture content of the Mo element, and reduces the coefficient of thermal...

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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 ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/22C22C38/02C22C38/24C22C38/30C22C33/04C21D1/28C21D1/18C23C8/00C23F17/00C21D8/00
CPCC22C38/04C22C38/22C22C38/02C22C38/24C22C38/30C22C33/04C21D1/28C21D1/18C23C8/00C23F17/00C21D8/005
Inventor 胡国栋李天骊肖木兰
Owner 深圳市国科六点科技有限公司
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