Composite wax powder forming material for laser sintering and preparation method thereof

A molding material and laser sintering technology, applied in the field of wax powder molding materials, can solve the problems of incomplete surface quality of parts, poor dimensional accuracy of wax molds, large shrinkage deformation, etc., and achieve stable dimensions, increased powder coating density, and less ash content Effect

Active Publication Date: 2013-01-02
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the high melting point of polystyrene, high-temperature roasting must be used in the investment casting process, which will produce a large amount of irritating and toxic gases and cause great environmental pollution; Incomplete parts or reduced surface quality
[0005] The traditional wax powder raw materials for rapid prototyping are all sing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The medium-molecular-weight polyethylene wax with a ring and ball softening point of 80-100°C and the low-molecular-weight polyethylene wax with a ring-and-ball softening point of 60-80°C were respectively pulverized in a low-temperature freezing and crushing equipment at -150°C, and passed through a 500-mesh sieve. Take 1Kg of crushed medium-molecular-weight polyethylene wax and 300g of low-molecular-weight polyethylene wax, put them into a mixer, mix at a low speed of 100r / min for 20min, stop the machine for 5min, and then mix at a high speed of 300r / min for 15min. Put the mixture into a vacuum drying oven and vacuumize to 10 -4 Pa, heat up to 50°C and keep warm for 20min. The mixture was taken out from the vacuum drying oven and quickly quenched with liquid nitrogen. Pass the quenched material through a 160-mesh standard sieve to obtain a two-component wax powder material.

[0035] Add 3g of fumed silica, 5g of organic bentonite, 5g of 2,4-dihydroxybenzophenone, an...

Embodiment 2

[0037] The medium-molecular-weight polyethylene wax with a ring and ball softening point of 80-100°C and the low-molecular-weight polyethylene wax with a ring-and-ball softening point of 60-80°C were respectively pulverized in a low-temperature freezing and crushing equipment at -200°C, and passed through a 500-mesh sieve. Take 1Kg of crushed medium-molecular-weight polyethylene wax and 500g of low-molecular-weight polyethylene wax, put them into a mixer, mix at a speed of 300r / min for 20min, stop for 5min, and mix for 20min at a speed of 300r / min. Put the mixture into a vacuum drying oven and vacuumize to 10 -4 Pa, heat up to 55°C and keep warm for 15 minutes. The mixture was taken out from the vacuum drying oven and quickly quenched with liquid nitrogen. Pass the quenched material through a 160-mesh standard sieve to obtain a two-component wax powder material.

[0038] Add 5g of fumed silica, 10g of organic bentonite, 10g of 2-hydroxy-4-octyloxybenzophenone, 3g of glyceryl...

Embodiment 3

[0040] The medium-molecular-weight polyethylene wax with a ring and ball softening point of 80-100°C and the low-molecular-weight polyethylene wax with a ring-and-ball softening point of 60-80°C were respectively pulverized in a low-temperature freezing and crushing equipment at -200°C, and passed through a 500-mesh sieve. Take 1Kg of crushed medium-molecular-weight polyethylene wax and 700g of low-molecular-weight polyethylene wax, put them into a mixer, mix at a speed of 500r / min for 10min, stop for 3min, and mix for 20min at a speed of 200r / min. Put the mixture into a vacuum drying oven and vacuumize to 10 -4 Pa, heat up to 60°C and keep warm for 10min. The mixture was taken out from the vacuum drying oven and quickly quenched with liquid nitrogen. Pass the quenched material through a 160-mesh standard sieve to obtain a two-component wax powder material.

[0041] Add 8g of fumed silica, 15g of organic bentonite, 15g of 2,4-dihydroxybenzophenone, and 5g of mannitol ester to ...

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PUM

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Abstract

A composite wax powder forming material for laser sintering is formed by mixing bi-component wax powder materials, gaseous-phase silica, organic bentonite, diphenyl ketone light absorber and nonionic antistatic agents, wherein the bi-component wax powder materials are prepared by mixing medium-molecular-weight polyethylene wax with the ring-and-ball softening point of 80-100 DEG C and low-molecular-weight polyethylene wax with the ring-and-ball softening point of 60-80 DEG C, drying in a vacuum manner, preshrinking and quenching by liquid nitrogen. Shrinkage and buckling deformation and the like of the composite wax powder forming material during laser sintering are improved, size accuracy of sintered parts is improved, linear shrinkage of produced wax powder forming parts is 0.3-0.6%, size is stable, and high-accuracy and large-size wax patterns and wax molds can be manufactured.

Description

technical field [0001] The invention relates to a wax powder molding material, in particular to a composite wax powder molding material for laser sintering and a preparation method of the composite wax powder molding material. Background technique [0002] Wax pattern making is an important process in investment casting. At present, there are two main methods for making wax-types: one is to use molds to turn over the mold, and the other is to use polystyrene powder or wax powder to manufacture through rapid prototyping. [0003] The mold turning process is complicated, and the mold design and manufacturing cycle is long. For example, it takes several months to design and manufacture a set of turbocharger compressor impeller molds for diesel engines. When the impeller structure needs to be changed, the original mold will be wasted. The design and manufacture of the mold and the finalization of the process have become a major constraint to speed up the development of new pro...

Claims

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Application Information

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IPC IPC(8): C08L91/06C08K13/02C08K3/36C08K3/34C08K5/132C08K5/12C08K5/11
Inventor 王建宏张慧芳高建峰徐宏
Owner ZHONGBEI UNIV
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