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Precision casting method of novel vessel jet pump

A technology of precision casting and jet pumps, which is applied in the field of pump parts casting, can solve the problems of large reserve margin, low yield rate, large machining allowance, etc., and achieve the goals of reducing workload, good compactness, and improving molding rate Effect

Inactive Publication Date: 2020-04-24
JIANGSU DEHUA PUMP MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the casting method of marine pump parts is ordinary sand casting. The mold is made of wood mold or aluminum mold. The technology is backward, casting defects are prone to occur, the yield rate is not high, and the loss is large
[0003] At the same time, the production of jet pumps for ships and ships uses sand casting copper or iron to obtain product blanks. The disadvantages of this method are: low yield, rough surface, and large machining allowance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Precision Casting Method of New Ship Jet Pump

[0032] (1) Design process parameters: analyze the structural characteristics of the casting, judge the defect tendency, cutting allowance, and obtain the gate position;

[0033] (2) Pressed wax: at 50°C, 15kg / cm 2 Use the wax press machine to make the wax mold under the wax pressing condition, and after the wax mold is corrected, the wax mold is assembled;

[0034] (3) Shell making: immerse the assembled wax model in the slurry for dipping, and immediately drench the sand after immersing in the slurry, immerse it in the slurry again after drying, and then dry the wax model naturally, and use silica sol for the slurry;

[0035] (4) Dewaxing: the air-dried wax mold is dewaxed under steam fumigation conditions at 110°C to form a casting mold;

[0036] (5) Roasting: put the casting mold into a roasting furnace for roasting and heating, and heat to the same temperature as the molten stainless steel;

[0037] (6) Casting: Put...

Embodiment 2

[0041] Precision Casting Method of New Ship Jet Pump

[0042] (1) Design process parameters: analyze the structural characteristics of the casting, judge the defect tendency, cutting allowance, and obtain the gate position;

[0043] (2) Pressed wax: at 60°C, 5kg / cm 2 Use the wax press machine to make the wax mold under the wax pressing condition, and after the wax mold is corrected, the wax mold is assembled;

[0044] (3) Shell making: immerse the assembled wax model in the slurry for dipping, and immediately drench the sand after immersing in the slurry, immerse it in the slurry again after drying, and then dry the wax model naturally, and use silica sol for the slurry;

[0045] (4) Dewaxing: the air-dried wax mold is dewaxed under steam fumigation conditions at 130° C. to form a casting mold;

[0046] (5) Roasting: put the casting mold into a roasting furnace for roasting and heating, and heat to the same temperature as the molten stainless steel;

[0047] (6) Casting: Pu...

Embodiment 3

[0051] Precision Casting Method of New Ship Jet Pump

[0052] (1) Design process parameters: analyze the structural characteristics of the casting, judge the defect tendency, cutting allowance, and obtain the gate position;

[0053] (2) Pressed wax: at 55°C, 10kg / cm 2 Use the wax press machine to make the wax mold under the wax pressing condition, and after the wax mold is corrected, the wax mold is assembled;

[0054] (3) Shell making: immerse the assembled wax model in the slurry for dipping, and immediately drench the sand after immersing in the slurry, immerse it in the slurry again after drying, and then dry the wax model naturally, and use silica sol for the slurry;

[0055] (4) Dewaxing: the air-dried wax mold is dewaxed under steam fumigation conditions at 120° C. to form a casting mold;

[0056] (5) Roasting: put the casting mold into a roasting furnace for roasting and heating, and heat to the same temperature as the molten stainless steel;

[0057](6) Casting: Pu...

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Abstract

The invention discloses a precision casting method of a novel vessel jet pump. The precision casting method comprises the eight steps of (1) technological parameter designing; (2) wax pressing, correcting and tree assembling; (3) shell making; (4) dewaxing; (5) roasting; (6) casting; (7) shelling; and (8) sand blasting, shot blasting, correcting and acid pickling. According to the precision casting method, a relatively mature precision casting process is introduced into manufacturing of jet pump parts of vessels, so that the size of the casting is closer to the final size of a drawing, the surface smoothness is very good, the parts are attractive, turning is hardly needed, time and labor are saved, and the yield is high. Holes of a pump body flange can be cast together through precision casting, punching is not needed in the later period, and the workload is reduced; and meanwhile, the surface of an inner hole of the cast pump body is smooth, remachining is not needed, and the machining workload is also reduced.

Description

technical field [0001] The invention relates to the technical field of pump parts casting, in particular to design a precision casting method for a new type of ship jet pump. Background technique [0002] Naval and marine jet pumps are a kind of equipment that every ship must use. For a long time, copper or iron materials have been used for production by sand casting. At present, the casting method of marine pump parts is ordinary sand casting. The mold is made of wood mold or aluminum mold. The process is backward, and casting defects are prone to occur, the yield rate is not high, and the loss is large. [0003] At the same time, the production of jet pumps for ships and ships uses sand casting copper or iron to obtain product blanks. The disadvantages of this method are: low yield, rough surface, and large machining allowance. [0004] Therefore, it is a technical problem urgently needed to be solved by those skilled in the art to provide a precision casting method of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/22B22C7/02B22D31/00
CPCB22C7/02B22C9/04B22C9/22B22D31/002
Inventor 姜庆华张东林
Owner JIANGSU DEHUA PUMP MFG CO LTD
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