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Method for rapidly manufacturing injection-mould insert with follow-cooling passageway

A technology for injection molds and conformal cooling, which is applied in the direction of improving process efficiency and energy efficiency, and can solve the problems of complex material preparation process, large equipment investment, and complex process

Inactive Publication Date: 2006-10-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This cooling technology has the following problems: First, the cooling efficiency is low and the cooling effect is poor
However, the materials developed by DTM are all metal-coated powders. Metal-coated powders are mixed powders coated with polymers on metal surfaces. The preparation requires special equipment, and the cost is high and the process is complicated.
[0005] The current research shows that it is completely feasible to use SLS technology to realize the rapid manufacture of molds with conformal cooling channels, but there is no mature SLS-based conformal cooling channel design method, and there are also large investment in equipment and material preparation. The process is complicated, the price is expensive, and the disadvantages of pollution to the environment
[0006] In order to solve the shortcomings of traditional machining and SLS manufacturing with conformal cooling channels, we have developed a new type of low-power laser indirect molding material with simple preparation, good formability and low price.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] Set the conformal cooling channel according to the surface contour of the mold insert cavity, and output the graphics in STL file format through a 3D modeling software (such as Pro-E), and then input the STL file into the computer of the selective laser sintering system. The mixed powder of 316 stainless steel powder (less than 50 μm) and epoxy resin powder (average particle size 12 μm) is used as the molding raw material, wherein the epoxy resin powder accounts for 5%. The mixed powder was formed on the HRPS-II A selective laser sintering system of Huazhong University of Science and Technology to form the mold insert blank. The bed preheat temperature was 56°C. After forming, the parison passes through vacuum cleaning equipment to remove loose powder in the flow channel.

[0029] The parison is put into a vacuum degreasing furnace for degreasing treatment, the highest degreasing temperature is 750-800°C, and the time is 5-8 hours. The degreased shape is put into a va...

example 2

[0032]Set the conformal cooling channel according to the surface contour of the mold insert cavity, and output the graphics in STL file format through a 3D modeling software (such as Pro-E), and then input the STL file into the computer of the selective laser sintering system. The mixed powder of industrial pure iron powder (less than 45 μm), carbonyl nickel powder (less than 5 μm) and phenolic resin powder (less than 12 μm) is used as the molding raw material, of which carbonyl nickel powder accounts for 3.5%, epoxy resin powder accounts for 4%, and the balance For pure iron powder. The mixed powder was formed on the HRPS-II A selective laser sintering system of Huazhong University of Science and Technology to form the mold insert blank. The bed preheating temperature was 75°C. After forming, the parison passes through vacuum cleaning equipment to remove loose powder in the flow channel.

[0033] The parison is put into a vacuum degreasing furnace for degreasing treatment, ...

example 3

[0036] Set the conformal cooling channel according to the surface contour of the mold insert cavity, and output the graphics in STL file format through a 3D modeling software (such as Pro-E), and then input the STL file into the computer of the selective laser sintering system. The mixed powder of industrial pure iron powder (less than 45 μm), graphite powder (less than 40 μm) and epoxy resin powder (less than 12 μm) is used as the molding raw material, of which graphite powder accounts for 0.8%, epoxy resin powder accounts for 7%, and the balance is Pure iron powder. The mixed powder was formed on the HRPS-II A selective laser sintering system of Huazhong University of Science and Technology to form the mold insert blank. The bed preheating temperature was 80°C. After forming, the parison passes through vacuum cleaning equipment to remove loose powder in the flow channel.

[0037] The parison is put into a vacuum degreasing furnace for degreasing treatment, the highest degr...

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Abstract

The present invention discloses a quick manufacture method of injection mould insert with form-following cooling flow passage. Said method includes the following steps: firstly, according to the injection mould cavity surface profile utilizing three-dimensional CAS software (for example Pro / Engineer or Unigraphics) to set form-following cooling flow passage, then making the mould three-dimensional graph be derived according to STL format file and inputted into the computer of selective laser sintering system; according to user's requirements adopting mixed powder of metal with different properties and high-molecule as forming raw material powder, making said mixed powder undergo the process of the above-mentioned laser sintering system to obtain the mould insert blank, making the mould insert blank undergo the processes of degreasing, secondary sintering and metal melt-infiltration so as to obtain the compact insert.

Description

technical field [0001] The invention belongs to the field of advanced rapid manufacturing, and in particular relates to a rapid manufacturing method of an injection mold insert with a conformal cooling channel. Background technique [0002] Mold technology is one of the most widely used technologies in the manufacturing industry today. The cooling system of the mold has an important impact on the life of the mold, the production efficiency and quality of the product. The traditional method of mold manufacturing is to process the metal blank by turning, milling, planing, drilling, grinding, electric erosion, etc., so as to obtain the required mold shape and size. The above method is still difficult to process the inner hole whose track is a three-dimensional curve in the metal blank. Therefore, the cooling channel of the mold manufactured by the traditional method is generally composed of a group of straight openings, in order to form a closed flow channel. For roads, openin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F3/24B29C33/38
CPCY02P10/25
Inventor 史玉升黄树槐刘锦辉鲁中良
Owner HUAZHONG UNIV OF SCI & TECH
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