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WCp/EPS evanescent mode pattern and WCp/Fe composite preparation

A technology of composite materials and lost foam, applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of difficulty in mass production, damage to the shape of prefabricated parts, and only 3-5mm, so as to improve the comprehensive mechanical properties , Increase the thickness of wear-resistant layer, reduce the effect of mold requirements

Active Publication Date: 2019-03-19
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(1) Prefabricated parts are not easy to prepare, especially prefabricated parts with complex shapes
(2) The pressure of squeeze casting is not easy to control. If the pressure is too small, liquid aluminum is not easy to squeeze in. If the pressure is too high, it is easy to damage the shape of the prefabricated part and the quality of the composite material.
(3) In the process of liquid squeeze casting, WC particles are easy to sink, resulting in uneven distribution of reinforcement phase
(4) The existing process cannot well solve the problem of uniformity of WC particle distribution in prefabricated parts
However, when coating the pattern, the size of the parts cannot be accurately controlled due to the difficulty of accurately controlling the thickness of the coating. Therefore, it brings great difficulties to mass production. The thickness of the grinding layer is usually only 3-5mm

Method used

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  • WCp/EPS evanescent mode pattern and WCp/Fe composite preparation
  • WCp/EPS evanescent mode pattern and WCp/Fe composite preparation

Examples

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preparation example Construction

[0050] to combine figure 1 As shown, the method flow chart of a method for preparing a WCp / EPS lost pattern pattern provided by the present invention, the present invention is a novel process technology for the preparation of a lost pattern pattern, and the preparation method mainly uses WC particles, EPS beads and rare earth powder , binder and other auxiliary materials; WC particles have excellent physical and chemical properties, because the market for WC particles as abrasives is very mature, there are many types of WC powders, and WC particles reinforced cast iron composites have good application prospects. Therefore, the WC particle-reinforced iron-based composite material prepared by adding WC particles provided by the abrasive industry into the iron alloy (casting method) has the advantages of low cost and suitable for industrial production. The method comprises the steps of:

[0051] 1) Weigh WC granules, rare earth powder, EPS beads, and binder in parts by volume, a...

Embodiment 1

[0073] A WCp / EPS lost pattern preparation process, comprising the following process steps:

[0074] 1) Weigh 5 parts of WC particles, 1 part of rare earth powder, 92 parts of EPS beads, and 2 parts of binder by volume, and mix the weighed WC particles, rare earth powder, EPS beads, and binder evenly. Complete mix preparation. Wherein, the particle size of WC particles is 500 mesh, and the rare earth powder is rare earth silicon.

[0075] 2) Preheat the mold, when the mold temperature reaches the working temperature of 100°C, start filling.

[0076] 3) Use compressed air to fill the mixed material into the mold, pass steam, the steam temperature is 120°C; the pressure is 0.15MPa; the holding time is determined by the average thickness of the pattern, and the holding time is 1min.

[0077] 4) After the pressure holding is completed, remove the hot steam and spray water on the back of the mold to cool down, so that the temperature of the pattern can be quickly cooled to 50°C an...

Embodiment 2

[0087] A WCp / EPS lost pattern preparation process, comprising the following process steps:

[0088] 1) Weigh 10 parts of WC particles, 2 parts of rare earth powder, 85 parts of EPS beads, and 3 parts of binder by volume, and mix the weighed WC particles, rare earth powder, EPS beads, and binder evenly, Complete mix preparation. Wherein, the particle size of WC particles is 2000 mesh, and the rare earth powder is rare earth silicon.

[0089] 2) Preheat the mold, when the mold temperature reaches the working temperature of 100°C, start filling.

[0090] 3) Use compressed air to fill the mixed material into the mold, and pass steam, the steam temperature is 120°C; the pressure is 0.25MPa; the holding time is determined according to the average thickness of the pattern, and the holding time is 10 minutes.

[0091] 4) After the pressure holding is completed, remove the hot steam, spray water on the back of the mold to cool down, so that the temperature of the pattern can be quick...

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Abstract

The invention discloses a WCp / EPS evanescent mode pattern and a WCp / Fe composite evanescent mode cast forming process, and belongs to the technical field of metal forming. A preparation method of theWCp / EPS evanescent mode pattern includes the following steps that WC particles, rare earth powder, EPS beads and an adhesive are weighed by volume parts and mixed to be uniform, and a mixture is prepared; a die is preheated, and when the temperature of the die reaches the working temperature of 100 DEG C, filling is started; the die is filled with the mixture through compressed air, and hot steamis introduced; and after the hot steam is relieved, water is sprayed to the back face of the die for cooling, the temperature of the pattern is rapidly cooled to 40-50 DEG C, the temperature is reduced below the softening temperature, and after the pattern is shaped, the die is stripped. According to the process method, alloy particles and a substrate are firmly bound, the particles are uniformlydispersed, the comprehensive mechanical performance of the product is improved, and large WCp / Fe composite parts with complex shapes can be manufactured through evanescent mode casting.

Description

technical field [0001] The invention belongs to the technical field of metal forming, and in particular relates to a WCp / EPS lost foam pattern and a WCp / Fe composite material lost foam casting forming process. Background technique [0002] WC has excellent physical and chemical properties, and the market for WC particles as abrasives is very mature. In particular, WCp / Fe composite materials are composed of hard phase WC and iron matrix, so they are most suitable for high stress, high wear and strong impact. Working conditions, and because of its low price, excellent high temperature resistance, high-speed wear resistance and good mechanical properties, WCp / Fe composite materials are gradually widely used in actual industrial production. [0003] The existing preparation techniques of WCp / Fe composite materials include powder metallurgy, dynamic forming, spray deposition, pressureless infiltration and casting. [0004] The powder metallurgy method is first to mix the matrix ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C7/02B22C9/04B22D27/20B22D18/04
CPCB22C7/02B22C9/046B22D18/04B22D27/20
Inventor 谭建波
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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