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A kind of water pump casting molding sand preparation process

A preparation process and molding sand technology, which is applied in the direction of casting molding equipment, casting molds, manufacturing tools, etc., can solve the problems of low recovery rate of old sand, sand washing of molding sand, etc., achieve high economic value and social value, and solve the problem of sand washing and swelling Sand, the effect of improving air permeability

Inactive Publication Date: 2016-04-13
SICHUAN ANYUE YULIANG AUTOMOBILE WATER PUMP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the deficiencies in the above-mentioned technologies, the present invention provides a water pump casting molding sand preparation process that effectively solves the problems of sand washing, sand swelling, and low recovery rate of old sand after casting.

Method used

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  • A kind of water pump casting molding sand preparation process

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Comparison scheme
Effect test

Embodiment 1

[0017] A kind of water pump casting molding sand preparation process, it comprises the following steps,

[0018] a. Screen the waste sand with an 80-mesh sieve to obtain regenerated sand for subsequent use;

[0019] B, screen the new red sand with a 100-mesh sieve for subsequent use;

[0020] c. Preparation of molding sand: weigh the following raw materials according to the weight of the molding sand prepared as required, 20 parts of new red sand, 67 parts of recycled sand, 4 parts of bentonite, 2 parts of curing agent, 4 parts of modified starch and 3 parts of water glass share;

[0021] d, mixing of molding sand: add the raw materials weighed in the step c to the sand mixer, and mix and grind for 25 minutes;

[0022] e. Add water to the mixture in step d, and then fully mix and grind for 7 minutes, wherein the added water accounts for 1.3% of the total mass of the final mixture.

[0023] Among them, the water content of new red sand and recycled sand is controlled within ...

Embodiment 2

[0025] A kind of water pump casting molding sand preparation process, it comprises the following steps,

[0026] a. The waste sand is screened with a 85-mesh sieve to obtain regenerated sand for subsequent use;

[0027] B, the new red sand is sieved with 108 mesh sieves for subsequent use;

[0028] c. Preparation of molding sand: weigh the following raw materials according to the weight of the molding sand prepared as required, 18 parts of new red sand, 70 parts of recycled sand, 3.5 parts of bentonite, 2 parts of curing agent, 1.9 parts of modified starch and 3 parts of water glass share;

[0029] d, mixing of molding sand: add the raw materials weighed in the step c to the sand mixer, and mix and grind for 21 minutes;

[0030] e. Add water to the mixture in step d, and then fully mix and mill for 10 minutes, wherein the added water accounts for 1.5% of the total mass of the final mixture.

[0031] Wherein, the water content of new red sand and recycled sand is controlled ...

Embodiment 3

[0033] A kind of water pump casting molding sand preparation process, it comprises the following steps,

[0034] a. Screen the waste sand with a 95-mesh screen to obtain regenerated sand for subsequent use;

[0035] b. Screen the new red sand with a 118-mesh sieve for subsequent use;

[0036] c. Preparation of molding sand: weigh the following raw materials according to the weight of the molding sand prepared as needed, 18.5 parts of new red sand, 85 parts of recycled sand, 4.5 parts of bentonite, 3 parts of curing agent, 4.4 parts of modified starch and 3.3 parts of water glass share;

[0037] d, mixing of molding sand: add the raw materials weighed in the step c to the sand mixer, and mix and grind for 24 minutes;

[0038] e. Water is added to the mixture in step d, and then fully mixed and milled for 11 minutes, wherein the added water accounts for 1% to 2% of the total mass of the final mixture.

[0039] The performance indicators of the molding sand prepared by the abo...

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Abstract

The invention discloses a preparation technology of casting sand for a water pump casting. The preparation technology comprises the following steps: waste sand and new red sand are screened by a screen mesh for reservation; according to weight of the casting sand required to be prepared, the following raw materials are weighed in parts by weight: 0-20.8 parts of new red sand, 65.2-85 parts of reclaimed sand, 3.5-5 parts of bentonite, 1-3.4 parts of a curing agent, 1.8-4.5 parts of modified starch and 2.2-3.4 parts of soluble glass; the raw materials weighted in step c are fed into a sand mixer for mixing grinding for 20-25 min; and water is replenished in the mixture in step d, and then the mixture is subjected to sufficient mixing grinding for 5-12 min, wherein the replenished water accounts for 1%-2% of the total mass of a final mixture. The preparation technology of the casting sand for the water pump casting is simple; the casting sand which is mixed and produced with the technology meets a performance index required by production and overcomes the defects of sand removal, sand swell and the like; and further, the air permeability of the casting sand is improved, the air hole rejection rate is reduced, surface quality of the product is good, and new red sand and coal dust are saved.

Description

technical field [0001] The invention relates to the technical field of water pump castings, in particular to a molding sand preparation process for castings such as water pumps on automobiles. Background technique [0002] Casting is one of the basic industries of machinery manufacturing. The quality of castings directly affects the quality of the mechanical products it manufactures. Although the currently commonly used sand mixing process has the advantages of high production efficiency, good surface roughness of castings, less sand cleaning workload, and low production cost, but the castings cast by the mixed sand produced by these processes will have many flashes , burrs, easy sand washing and sand expansion; at the same time, there is also a low recovery rate of old sand. Contents of the invention [0003] In order to overcome the deficiencies in the above-mentioned technologies, the present invention provides a water-pump casting molding sand preparation process that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C5/06B22C5/04B22C1/00B22C1/10B22C1/18
Inventor 王述学
Owner SICHUAN ANYUE YULIANG AUTOMOBILE WATER PUMP
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