Titanium alloy variable-pitch milling three-dimensional modeling method based on finite elements

Abstract

The invention discloses a titanium alloy variable-pitch milling three-dimensional modeling method based on finite elements. The titanium alloy variable-pitch milling three-dimensional modeling method includes steps of firstly acquiring tool system parameters and material parameters of workpieces and a tool and devising technical cutting parameters; modeling a milling tool geometrically according to the technical parameters and the principle that the radial included angle ratio of various tool teeth to a former tool tooth of the milling tool is equal to the corresponding ratio of feed engagement per tooth; modeling physical models of the milling tool and the workpieces as well as the contact relation and the kinematic relation; submitting operations to an ABAQUS/Explicit solver; drawing a milling force-time curve, a milling temperature-time curve, or a stress and strain figure of a certain specific joint set after the solution is obtained. The helical angle of the milling tool is considered, so that modeling can be closer to the real machining condition; by adopting geometric variable-pitch modeling, different working conditions of feed engagement per tooth can be simulated at one time, and modeling and computing time is saved.

Description

Technical field [0001] The invention belongs to the field of metal processing finite element simulation analysis, and more specifically, relates to a finite element-based three-dimensional modeling method for titanium alloy variable pitch milling. Background technique [0002] Titanium alloy has a series of excellent physical properties such as low density, high specific strength, strong heat resistance, good low temperature performance and good corrosion resistance. It is widely used in many fields such as aircraft engine parts, rocket and missile structural parts. Among the hundreds of existing titanium alloys, Ti6Al4V has better heat resistance, toughness, plasticity, strength and biocompatibility, and its usage accounts for nearly 80% of all titanium alloys. However, while having excellent properties, titanium alloy is also a typical difficult-to-process material. Due to the characteristics of small deformation coefficient, high cutting temperature, serious chilling phenomen...

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Problems solved by technology

[0004] For the above defects or improvement needs of the prior art, the purpose of the present invention is to provide a finite element based titanium alloy variable pitch milling three-dimensional modeling method, wherein by selecting parameters, material constitutive model, tool geometry model Compared with the existing technology, it can effectively solve the problem that the single simulation is far from the actual processing situation and the repeated simulation is time-consuming, and can more accurately predict the mechanical parameters and surface integrity parameters of cutting under given process parameters. ; and the accuracy of single simulation is high, which can more intuitively simulate the process of 3D milling, improve the efficiency of milling simulation, and achieve the technical effect of reducing calculation costs

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