A Prediction Method of Temperature Field in Cutting Area for Ultra-low Temperature Cooling Machining

A prediction method and ultra-low temperature technology, applied in the direction of design optimization/simulation, geometric CAD, etc., can solve the problem that the boundary of the cutting area of ​​the liquid nitrogen cold source and the influence of cutting parameters cannot be accurately reflected, so as to improve the calculation efficiency and accuracy, and improve the Processing quality and processing efficiency, the effect of ensuring accuracy

Active Publication Date: 2021-05-11
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] The above methods can reasonably predict the temperature field in the cutting area under dry cutting or quasi-dry cutting conditions, but cannot accurately reflect the influence of the introduction of liquid nitrogen cold source in ultra-low temperature cooling processing on the boundary of the cutting area and cutting parameters

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  • A Prediction Method of Temperature Field in Cutting Area for Ultra-low Temperature Cooling Machining
  • A Prediction Method of Temperature Field in Cutting Area for Ultra-low Temperature Cooling Machining
  • A Prediction Method of Temperature Field in Cutting Area for Ultra-low Temperature Cooling Machining

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[0136] The detailed implementation of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0137] Taking the external turning of titanium alloy (Ti-6Al-4V) as an example, the workpiece size is Φ100×200, and the cutting process parameter is the cutting depth a p = 0.2mm, feed speed f = 0.15mm / min, spindle speed n = 450rpm; the material of the turning tool is hard alloy, the rake angle α = 5°, the relief angle ψ = 5°, and the cutting width w = 4.5 mm. Liquid nitrogen is applied to the tool surface from the front and rear cutter faces at the same time, and the effective cooling length is l eff = 4.5 mm. The density of titanium alloy ρ=4430kg / m 3 , thermal conductivity λ w =6.7W / mK, specific heat capacity C p =560J / kgK, thermal diffusivity a=2.7×10 -6 m 2 / s, JC material constant A=968MPa, B=380MPa, n=0.421, C=0.0197, m=0.577, melting temperature T m =1668°C. Thermal conductivity of cemented carbide...

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Abstract

The invention provides a method for predicting a temperature field in a cutting region for ultra-low temperature cooling processing, and belongs to the technical field of low temperature processing. This method first calculates the cutting parameters in ultra-low temperature machining according to the processing parameters, material performance parameters and liquid nitrogen injection parameters, and determines the heat flux density of the cutting heat source and heat loss source; According to the temperature curve, the heat flux density of the friction heat source and the heat loss source of the rake face is redistributed to obtain the heat distribution ratio function; finally, the temperature distribution of chips, workpiece and tool near the tool nose area is calculated. The biggest advantage of this method is: it avoids the calculation error caused by cumbersome experiments and iterative algorithms, and can accurately predict the distribution of the temperature field in ultra-low temperature machining according to the actual processing parameters; it also takes into account the application of ultra-low temperature cooling medium on the front and rear cutter faces at the same time , more suitable for the practical application of ultra-low temperature cooling processing.

Description

technical field [0001] The invention belongs to the technical field of low-temperature processing, in particular to a method for predicting the temperature field of a cutting region in ultra-low temperature cooling processing. Background technique [0002] Difficult-to-machine metal materials such as titanium alloys and high-temperature alloys have the characteristics of low thermal conductivity and large friction coefficient. The cutting process will generate a lot of cutting heat, resulting in local high temperature on the rake face of the tool, which intensifies the wear process of the tool and causes Adhesion, dissolution, diffusion and other processing defects. In order to improve tool life and material cutting performance, ultra-low temperature cooling processing methods have been widely used and studied. The principle is to directly spray low-temperature medium into the processing area to quickly reduce the temperature of the cutting area, thereby realizing high-quali...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17G06F30/20
Inventor 王永青刘佳欣刘阔刘召欢戴明华韩灵生
Owner DALIAN UNIV OF TECH
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