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Method for testing residual stress distribution of ram casting for large-scale machine tool by blind hole method

A residual stress and blind hole method technology, applied in the direction of measuring force, measuring device, instrument, etc., can solve the problems of high cost, expensive equipment, complicated calculation, etc., and achieve the effect of low cost, perfect theory and simple calculation.

Active Publication Date: 2015-11-18
桂林市佳隆机械制造有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are many methods for testing the residual stress at home and abroad. The relatively mature and widely recognized method is the X-ray diffraction method. Complex, often used in the occasion of plane stress to measure the internal stress of fine-grained materials

Method used

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  • Method for testing residual stress distribution of ram casting for large-scale machine tool by blind hole method
  • Method for testing residual stress distribution of ram casting for large-scale machine tool by blind hole method
  • Method for testing residual stress distribution of ram casting for large-scale machine tool by blind hole method

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Embodiment

[0025] A method for testing the residual stress distribution of a ram casting for a large machine tool by using the blind hole method, comprising the following steps:

[0026] 1) Take the ram casting out of the mold, remove the excess parts other than the body, and polish the inner and outer surfaces of the casting;

[0027] 2) Analyze the structure of the ram casting, select the residual stress test surface, and polish and clean each surface, and then arrange the residual stress measurement points;

[0028] 3) Test the strain caused by the residual stress at each test point;

[0029] 4) Analyze and integrate the strain data obtained from the test, use the residual stress calculation formula to calculate the residual stress value at each point, and finally obtain the residual stress distribution of the ram casting through curve fitting, and the result deviation is ±5Mpa.

[0030] Step 1) is specifically to remove the core and core iron on the ram casting, cut off the gate, ri...

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Abstract

The invention discloses a method for testing residual stress distribution of a ram casting for a large-scale machine tool by a blind hole method. The method comprises the following steps of taking out the ram casting from a casting mold; selecting a residual stress test surface; arranging residual stress test points; testing strain caused by residual stress of each test point; analyzing and integrating strain data obtained by testing; and calculating the value of residual stress of each point to obtain residual stress distribution. The method is low in cost, simple in calculation, high in measurement precision, perfect in theory and mature in technology, does not require expensive equipment, and evaluates the residual stress distribution accurately and scientifically. With the method, the residual stress distribution of the ram casting can be tested and obtained, so that stress concentration portions and weak portions of the ram structure can be determined, and reference data can be provided for design and optimization of the ram casting forming technology.

Description

technical field [0001] The invention relates to the field of stress testing of large castings, in particular to a method for testing residual stress distribution of ram castings for large machine tools by using a blind hole method. Background technique [0002] With the rapid development of my country's high-end manufacturing and equipment industry, the requirements for the machining accuracy of parts are getting higher and higher. As the core functional part of large CNC machine tools, the ram is equipped with a machine tool spindle. Therefore, the deformation of the ram will directly lead to the relative error between the tool and the workpiece, which is an important factor affecting the processing quality. The ram casting is long and has a large difference in wall thickness. During the casting process, due to uneven temperature distribution, shrinkage and phase transformation will occur when the temperature drops, causing stress inside. When the internal stress is not com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/22
Inventor 卢健魏德强王荣隋欣梦陈虎城钟盛黄海峰杨亮亮
Owner 桂林市佳隆机械制造有限公司
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