Lost-foam casting method for water pump thin-wall part

A technology of lost foam casting and thin-walled parts, which is applied to casting molding equipment, molds, mold components, etc., which can solve problems such as high scrap rate, inaccurate positioning, and waste of personnel, and achieve processing cost saving and manufacturing cost reduction , The effect of improving work efficiency

Inactive Publication Date: 2010-04-28
SHANXI TIANHAI PUMP IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the thin-walled parts for water pumps used in the market mainly include: impeller and diversion shell. The existing technology adopts sand casting method, which requires oil sand core. The process is complicated, the rejection rate is high, the casting is rough, not only the surface finish is not enough, Moreover, serious deformation and inaccurate positioning of the blade during the casting process directly affect the hydraulic performance of the product, the stability of the product, too many human factors, the performance is difficult to be consistent with the drawing, and the casting environment is poor, the waste of personnel is serious, and the environment is polluted. high coefficient
[0003] The existing lost foam casting process is mainly used to cast large and thick parts, but the lost foam casting of thin-walled parts is basically a blank

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0021] The lost foam casting method of thin-walled parts for water pumps, including: bead foaming, molding, coating, drying and molding casting, is carried out according to the following steps:

[0022] a. Bead foaming

[0023] First select GP-4S standard grade polystyrene beads and add them into the foam barrel for pre-foaming, the steam pressure is 0.1Kg / cm 2 , the temperature of the foaming barrel is 98°C, and the air pressure is 0.06Kg / cm 2 , the feeding amount at one time is 0.7kg. After the beads are foamed and unloaded, they are dried in a fluidized bed with hot air at a drying temperature of 20°C. They can be used after 2 hours and used up within 12 hours;

[0024] b. Forming

[0025] Put the foamed beads into the mold preheated to 95°C for molding, and the steam pressure is 1Kg / cm 2 , heated for 12 seconds, cooled to 30°C by water cooling, and then took out the molded white mold;

[0026] c. Hang paint

[0027] First put the paint into the mixing tank, stir at hi...

specific Embodiment 2

[0032] The lost foam casting method of thin-walled parts for water pumps, including: bead foaming, molding, coating, drying and molding casting, is carried out according to the following steps:

[0033] a. Bead foaming

[0034] First select GP-4S standard grade polystyrene beads and add them into the foam barrel for pre-foaming, the steam pressure is 0.15Kg / cm 2 , the temperature of the foaming barrel is 100°C, and the air pressure is 0.1Kg / cm 2 , the feeding amount at one time is 1kg, after the beads are foamed and unloaded, they are dried in a fluidized bed with hot air at a drying temperature of 25°C, and can be used after 2 hours and used up within 12 hours;

[0035] b. Forming

[0036] Put the foamed beads into a mold preheated to 110°C for molding, and the steam pressure is 1.2Kg / cm 2 , heated for 16 seconds, cooled to 35°C by water cooling, and then took out the molded white mold;

[0037] c. Hang paint

[0038] First put the paint into the mixing tank, stir at hig...

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Abstract

The invention relates to a lost-foam casting method for a water pump thin-wall part, which belongs to the technical field of lost-foam casting. The invention provides the lost-foam casting method for the water pump thin-wall part with high casting precision and stable quality. The invention adopts a technical scheme that the lost-foam coasting method for the water pump thin-wall part comprises the steps of beads foaming, molding, hanging paint, drying and casting, wherein GP-4S standard level polystyrene beads are selected to be added in a foaming tank to be prefoamed, and the foamed beads are added into a mould preheated to 90 to 110 DEG C to be molded; secondly, the white mould is fully cured, dip-coated for three times and assembled into a cluster to be dried; and finally, casting is performed. The method is applied to the casting technology of water pump thin-wall parts.

Description

technical field [0001] The invention discloses a lost foam casting method for a thin-walled water pump, belonging to the technical field of lost foam casting. Background technique [0002] At present, the thin-walled parts for water pumps used in the market mainly include: impeller and diversion shell. The existing technology adopts sand casting method, which requires oil sand core. The process is complicated, the rejection rate is high, the casting is rough, not only the surface finish is not enough, Moreover, serious deformation and inaccurate positioning of the blade during the casting process directly affect the hydraulic performance of the product, the stability of the product, too many human factors, the performance is difficult to be consistent with the drawing, and the casting environment is poor, the waste of personnel is serious, and the environment is polluted. The coefficient is high. [0003] The existing lost foam casting process is mainly used to cast large a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/22B22D25/02
Inventor 刘院昌费智勤牛新惠朱克伟尚怀元董云霞
Owner SHANXI TIANHAI PUMP IND CO LTD
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