A Method for Precise Acquisition of Milling Residual Stress Based on 2D Simulation Analysis
A residual stress and acquisition method technology, applied in design optimization/simulation, special data processing applications, calculations, etc., can solve problems such as waste, time-consuming, large resource allocation, etc., to reduce resource usage, improve computing speed, high The effect of computational precision
Active Publication Date: 2020-05-26
BEIHANG UNIV
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Problems solved by technology
[0003] The technical problems mainly solved by the present invention are: in the mainstream milling simulation process, the three-dimensional cutting simulation method has a large amount of calculation, takes a long time, requires a huge waste of resource allocation, and does not conform to the rhythm of scientific research and design at the current stage; the two-dimensional simulation value The extracted area is in the chip area, and the simulation results are quite different from the surface integrity of the milled workpiece, which cannot meet the needs of existing scientific research and design.
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[0025] Step (1): The tool rake angle is 5°, the tool back angle is 16°, and the tool radius is 2mm; the material to be processed is titanium alloy, and the constitutive model is:
[0026]
[0027] The density is 4.43g / cm 3 , The thermal conductivity is 7.03W·m -1 ·℃ -1 , Young's modulus is 110Gpa, heat capacity is 505J / kg·℃, Poisson's ratio is 0.34; milling width is 0.2mm, milling depth is 0.4mm.
[0028] Step (2): Establish a tool model, one of which has an acute angle of 69°; establish a triangular and rectangular workpiece model, the upper part is a right-angled triangle, and the lengths of the right-angled sides are 0.2 (mm) and 1.3 (mm), the lower part It is a rectangle with a height of 1 (mm) and a width of 1.3 (mm).
[0029] Step (3): Place the tool according to the definition of the front and rear angles in the metal cutting principle, and the tool tip moves along the boundary line between the triangle and the rectangle of the workpiece, and the cutting depth gra...
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The invention provides a milling residual stress precise obtaining method based on two-dimension simulation analysis. The method comprises the steps of 1, determining needed simulation parameters according to actual situations; 2, building a two-dimension milling residual stress simulation model; 3, preliminarily calculating the milling simulation residual stress; 4, conducting multiple iterativecomputations to obtain the final milling residual stress. By means of the milling residual stress precise obtaining method based on the two-dimension simulation analysis, the requirement for hardwareneeded for the milling residual stress simulation can be lowered, the simulation efficiency is improved, the simulation calculation time is shortened, and compared with conventional two-dimension simulation, a more accurate simulation result can be obtained.
Description
technical field [0001] The invention relates to the technical field of obtaining residual stress during metal cutting, in particular to a method for accurately obtaining residual stress in milling based on two-dimensional simulation analysis, which is suitable for residual stress milling simulation tests of various materials. Background technique [0002] Metals inevitably introduce machining residual stress in the cutting process. Machining residual stress is an important index to measure the surface quality of the workpiece, which seriously affects the static strength, fatigue strength and stress corrosion resistance of the part, and then affects the service life of the part. At the same time, residual stress also affects the shape accuracy and dimensional stability of parts. In the processing of aerospace thin-walled parts, the existence of milling residual stress and its instability in subsequent use will cause stress relaxation and redistribution. This causes deformati...
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IPC IPC(8): G06F30/23
CPCG06F30/23G06F2119/06
Inventor 王延忠齐荣华陈燕燕刘鹏李菲
Owner BEIHANG UNIV