Microstructural gypsum mould preparation method

A micro-structure and micro-structure technology, applied in casting molding equipment, casting molds, casting mold components, etc., can solve the problems of poor surface finish of gypsum casting molds, difficulty in preparing gypsum casting molds, cracking of gypsum casting molds, etc. The effect of improved finish, reduced porosity defects, and improved flowability

Active Publication Date: 2016-01-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing gypsum molding method is difficult to prepare a gypsum mold with a size of several tens to hundreds of microns. It is easy to cause cracking or the formation of micro-crack defects during drying, and a preparation method for gypsum molds with microstructure is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0021] Specific embodiment one: this embodiment is a kind of preparation method that has microstructure gypsum mold and is finished according to the following steps:

[0022] 1. Add the retarder to the distilled water, and then stir until the retarder is dissolved in the distilled water to obtain an aqueous retarder solution;

[0023] The mass of retarder described in step 1 and the volume ratio of distilled water are (0.03g~0.5g): 35mL;

[0024] 2. Add gypsum powder to the retarder aqueous solution, stir evenly, then add gypsum defoamer, stir evenly, and obtain gypsum slurry;

[0025] The quality of the gypsum powder described in step 2 and the volume ratio of retarder aqueous solution are 100g: (30mL~35mL);

[0026] The volume ratio of the quality of the gypsum powder described in step 2 to the gypsum defoamer is 100g: (0.1mL~0.8mL);

[0027] 3. Put the ultrasonic horn into the gypsum slurry, and then ultrasonically treat it for 2 minutes to 5 minutes at an ultrasonic powe...

specific Embodiment approach 2

[0042] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the retarder described in step 1 is citric acid or sodium citrate. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0043] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the temperature of the distilled water in step 1 is 18°C-25°C. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a microstructural gypsum mould preparation method, and relates to a gypsum mould preparation method. The microstructural gypsum mould preparation method aims at solving the problems that gypsum moulds with dozens of micrometers to hundreds of micrometers of formation structures are unlikely to be prepared by a conventional gypsum formation method, the prepared gypsum moulds have poor surface smoothness and air hole defects, and defects such as cracking or formation of microcracks are easily caused in the follow-up drying process of the gypsum moulds. The microstructural gypsum mould preparation method comprises the following steps of: step one. preparing a retarder water solution; step two. preparing gypsum slurry; step three. removing gas from the gypsum slurry; step four. carrying out pouring and ultrasonic treatment; step five. allowing to stand; step six. drying at a room temperature; and step seven. carrying out gradual drying to obtain the microstructural gypsum mould. A microstructural gypsum mould prepared by the method has the advantages that the frequency of cracking and formation of cracks is reduced, and the rejection rate is remarkably reduced and is 0%-4%. The microstructural gypsum mould preparation method can be obtained.

Description

technical field [0001] The invention relates to a preparation method of a gypsum casting mold. Background technique [0002] Micro-precision casting is a new type of casting method that has been widely studied in the world in recent years. It can produce micro-components with a characteristic size below 1 mm with high efficiency, low cost and rapid production. Gypsum molds are often used in micro-precision casting. In order to cast micro-components with smaller feature size and higher surface quality, higher requirements are put forward for the surface finish of gypsum molds, control of pore defects and filling performance of gypsum slurry. At the same time, due to the special microstructure of the gypsum mold used for micro-precision casting, it is easy to cause cracks or form microcracks at the structural mutations during the drying process, resulting in a high scrap rate after the gypsum mold is dried. At present, the preparation and drying methods of gypsum molds are m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C1/00
Inventor 李邦盛晋玺周扬
Owner HARBIN INST OF TECH
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