Three-dimensional multi-particle finite element simulation method for predicting high-speed pressing forming performance of metal powder

A metal powder, high-speed pressing technology, applied in design optimization/simulation, instrument, image data processing, etc., can solve problems such as error-prone, labor-intensive, time-consuming, and cumbersome process, achieve completeness and correctness, reduce labor and time cost effects

Pending Publication Date: 2022-05-13
HEFEI UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] However, the multi-particle finite element method often involves hundreds or even thousands of particles, and the direct use of finite element sof

Method used

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  • Three-dimensional multi-particle finite element simulation method for predicting high-speed pressing forming performance of metal powder
  • Three-dimensional multi-particle finite element simulation method for predicting high-speed pressing forming performance of metal powder
  • Three-dimensional multi-particle finite element simulation method for predicting high-speed pressing forming performance of metal powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1 (Ti-6A1-4V powder compaction experiment)

[0055] The experiment is carried out on the high-speed pressing machine built. The experimental device is mainly composed of upper and lower punches, molds, and hammers. The whole high-speed pressing process consists of three steps of powder filling, compaction and discharge. Before powder filling, the die walls were lubricated with zinc stearate dissolved in acetone to facilitate ejection of the compact. The Ti-6Al-4V powder with a mass of 4.0 g was poured into the mold cavity and sandwiched between the upper and lower molds. During compaction, a weight is released at a specific height and then impacts the upper punch to compress the powder. Impact energy density per unit mass E′ in the experiment m defined as:

[0056]

[0057] Where: M=50Kg is the mass of the hammer body, H is the initial hanging height of the hammer, and m=4.0g is the mass of Ti-6A1-4V powder. A strain gauge was installed on the lower p...

Embodiment 2

[0059] Embodiment 2 (Ti-6Al-4V analog analysis experiment)

[0060] First, the discrete element software PFC 3D is used to generate the initial random packing model of three-dimensional spherical particles, such as figure 2 As shown, the diameter range of the three-dimensional spherical particles generated in it is 105-250 microns, and the distribution law is close to the Gaussian function, which matches the diameter distribution law of the powder used in the experiment: the container size is 800×800×902 mm, containing 142 spherical particles The porosity of the accumulation model is 0.175, which is consistent with the porosity of the powder used in the experiment; then the data of the center coordinates and diameter of each spherical particle are obtained, and the corresponding finite element model is generated by running the python script in the finite element software Abaqus.

[0061] Set the material properties, where the density of the Ti-6Al-4V material is 4.42g / cm 3 ,...

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Abstract

The invention relates to a three-dimensional multi-particle finite element simulation method for predicting high-speed pressing forming performance of metal powder, which comprises the following steps of: generating an initial random stacking model of three-dimensional spherical particles by using discrete element software, and extracting central coordinates and corresponding diameter data of the spherical particles; running a python script program in finite element software Abaqus, automatically completing modeling of spherical particle parts with different diameters, and generating an assembly; setting material attributes of the particles; each powder particle part is automatically divided into hexahedral structure grids with a reasonable number; setting and displaying dynamic analysis steps; setting boundary conditions; automatically setting contact attributes and contact pairs between metal powder balls and between the balls and the side wall of the mold; and solving, calculating and post-processing. According to the method, a large amount of complex finite element modeling work such as generation and assembly of a multi-particle part, grid division and contact setting is automatically completed, the modeling efficiency is greatly improved, the modeling correctness is guaranteed, the micro-mechanical characteristics of powder pressing are comprehensively analyzed, and the method is suitable for large-scale popularization and application. And the quantitative relation between the compact density and the impact energy per unit mass is accurately established, so that the purpose of predicting the high-speed pressing performance of the metal powder is achieved.

Description

technical field [0001] The invention relates to the field of simulation analysis of alloy powder pressing technology, in particular to a three-dimensional multi-particle finite element simulation method for predicting the high-speed pressing forming performance of metal powder. Background technique [0002] At present, powder metallurgy technology has been widely used in the fields of transportation, machinery, electronics, aerospace, weapons and nuclear industry. Using powder metallurgy technology can directly make porous, semi-dense or fully dense materials and products, such as oil-impregnated bearings, gears, etc. , cams, guide rods and other key mechanical components. The basic process of the powder metallurgy process mainly includes powder preparation, press forming, sintering and post-treatment. In the powder compaction stage, the preparation of qualified compacts is the key factor to ensure the quality of powder metallurgy products. Important information such as com...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06T17/20B22F3/02G06F119/14C22C1/04
CPCG06F30/23G06T17/20B22F3/02G06F2119/14C22C1/0458
Inventor 周剑徐宏坤祝宸宇刘焜
Owner HEFEI UNIV OF TECH
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