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Compound sand mold loam core based gypsum mold shell investing casting process

A casting process and gypsum molding technology, applied in the field of investment casting, can solve the problems of difficult control of the cavity of the gypsum mold, low shell strength, easy formation of blind holes, etc., achieving easy control of precision, complete demoulding, The effect of improving demolding efficiency

Active Publication Date: 2018-06-05
HUAINAN VOLITE FLUID EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Gypsum-type investment casting is a new casting technology first developed in foreign countries in the 1970s. Its technological process is to form a gypsum-type investment mold after certain processing and processing of raw materials configured in a certain proportion, and finally in the gypsum cast on the investment mold to form the final casting, and then the casting is dewaxed to obtain the plaster shell. In the preparation process, the plaster mold needs to be prepared first. It is not easy to control, and it is easy to form blind holes. At the same time, for the existing sand mold shell, the strength of the shell is not high, and it is easy to cause cracking of the shell during use or handling, and the existing wax core casting needs to be rebuilt after use. Injection mold core, complex process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A gypsum shell investment casting process based on a composite sand mold core, the specific process is as follows:

[0019] (1) After coating the inner surface of the mold cavity of the mold core box with a layer of light wax, then brush a layer of talc powder, and then inject the composite mortar into the mold cavity of the mold core box, and vibrate the mold core box by ultrasonic during the adding process. The composite mortar is filled evenly and densely, and the excess composite mortar is scraped off after the filling is uniform; the preparation process of the composite mortar is as follows: add 1.2 kg of oxidized starch into 4.6 kg of water, stir and mix evenly, and then add 2.5 kg of liquid phenolic resin, 1.2 kg of sodium base Bentonite and 0.5kg of zeolite powder are stirred evenly, then add 6.8kg of fine river sand with a particle size of 0.2-0.3mm, fully stir and mix, add 0.03kg of coupling agent, stir at high speed for 2-5min, and then add 2.4kg of m-benzene ...

Embodiment 2

[0026] A gypsum shell investment casting process based on a composite sand mold core, the specific process is as follows:

[0027] (1) After coating the inner surface of the mold cavity of the mold core box with a layer of light wax, then brush a layer of talc powder, and then inject the composite mortar into the mold cavity of the mold core box, and vibrate the mold core box by ultrasonic during the adding process. The composite mortar is filled evenly and densely, and the excess composite mortar is scraped off after the filling is uniform; the preparation process of the composite mortar is as follows: add 1.5kg of oxidized starch into 5kg of water, stir and mix evenly, and then add 3kg of liquid phenolic resin and 1,4kg of sodium bentonite. Stir with 0.6kg of zeolite powder, add 7kg of fine river sand with a particle size of 0.2-0.3mm, fully stir and mix, add 0.04kg of coupling agent, stir at high speed for 2-5min, then add 3kg of m-xylylenediamine before use Use immediately...

Embodiment 3

[0034] A gypsum shell investment casting process based on a composite sand mold core, the specific process is as follows:

[0035](1) After coating the inner surface of the mold cavity of the mold core box with a layer of light wax, then brush a layer of talc powder, and then inject the composite mortar into the mold cavity of the mold core box, and vibrate the mold core box by ultrasonic during the adding process. The composite mortar is filled evenly and densely, and the excess composite mortar is scraped off after the filling is uniform; the preparation process of the composite mortar is as follows: add 1.7kg of oxidized starch into 5.9kg of water, stir and mix evenly, and then add 3.4kg of liquid phenolic resin, 1.5kg of sodium base Bentonite and 0.8kg of zeolite powder are stirred evenly, then add 7.4kg of fine river sand with a particle size of 0.2-0.3mm, fully stir and mix, add 0.05kg of coupling agent, stir at high speed for 2-5min, and then add 3.2kg of m-benzene befor...

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Abstract

The invention discloses a compound sand mold loam core based gypsum mold shell investing casting process. The specific process comprises the following steps: coating a layer of polishing wax on the inner surface of a mold cavity of a mold core box, then coating a layer of talcum powder, injecting a compound mortar into the mold cavity of the mold core box, taking out a sand mold loam core; puttingthe sand mold loam core into a paraffin solution, coating a layer of paraffin on the surface of the sand mold loam core, then coating a layer of coating on the surface of the sand mold loam core, putting the sand mold loam core into a gypsum slurry after the coating is dried, enabling the surface of the sand mold loam core to be coated by two layers of gypsum shells, finally coating a layer of quartz sand on the surface of the sand mold loam core, and dewaxing to obtain the shell. The compound mortar is used to prepare a mold core, the mold core and the mold shell are isolated by a layer of paraffin, the mold core and the mold shell are separated by melting the paraffin, meanwhile, the mold core can be repeatedly used, the craft process is saved, in addition, the specifications of castings prepared from the same mold core are the same, and the degree of precision is easy to control.

Description

technical field [0001] The invention belongs to the field of investment casting, and relates to a gypsum shell investment casting process based on a composite sand mold core. Background technique [0002] Gypsum type investment casting is a new casting technology first developed abroad in the 1970s. Casting is carried out on the investment mold to form the final casting, and then the casting is dewaxed to obtain a gypsum shell. During the preparation process, the gypsum mold needs to be prepared first. It is difficult to control, and it is easy to form blind holes. At the same time, for the existing sand mold shell, the strength of the mold shell is not high, and it is easy to cause the mold shell to crack during use or during transportation, and the existing wax core casting needs to be re-used after use. Injection molding core, the process is complicated. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to provide a gypsum shell investment cast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C1/14B22C1/22B22C1/02B22C9/10
CPCB22C1/02B22C1/14B22C1/22B22C9/04B22C9/10
Inventor 刘奎新王璐孙同昂
Owner HUAINAN VOLITE FLUID EQUIP CO LTD
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