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Molding sand for wet core during malleable iron pipe fitting casting

A technology for molds and pipe fittings for wet cores, which is applied to casting molding equipment, casting molds, cores, etc., can solve the problems of increasing the core iron process, affecting the core-making efficiency, and consuming labor, so as to improve the core-making efficiency and prevent collapse. Good performance and high wet compressive strength

Inactive Publication Date: 2019-11-22
赤峰市建支管业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While consuming a lot of labor, it also consumed a lot of core iron
At the same time, due to the increase of the core iron process, it also affects the core-making efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: The molding sand for wet core casting of Benma steel pipe fittings adopts the following composition ratio and preparation method.

[0018] Proportion: old sand 450kg, new sand 450kg, bentonite 75kg, starch 3 kg, coal powder 2kg, water 20kg (mass fractions are 45%, 45%, 7.5%, 0.3%, 0.2%, 2%). Among them, the number of new sand and old sand is 170.

[0019] Preparation method: add new sand and old sand to the sand mixer in turn, then add coal powder, bentonite, then add starch, and finally add water, stir in the same direction, the stirring speed is 110 rpm, the stirring time is 120S, and the group The molding sand was obtained after stirring evenly, and the wet compressive strength after the molding sand was made into a wet core was 135kpa.

Embodiment 2

[0020] Example 2: The molding sand for wet core casting of Benma steel pipe fittings adopts the following composition ratio and preparation method.

[0021] Ratio: old sand 550kg, new sand 350kg, bentonite 70kg, starch 3 kg, coal powder 2kg, water 20kg (mass fractions are 55%, 35%, 7.5%, 0.3%, 0.2%, 2%). Among them, the number of new sand and old sand is 50.

[0022] Preparation method: add new sand and old sand to the sand mixer in turn, then add coal powder, bentonite, then add starch, and finally add water, stir in the same direction, the stirring speed is 100 rpm, the stirring time is 210S, the group After stirring evenly, the molding sand was obtained, and the wet compressive strength after the molding sand was made into a wet core was 136kpa.

Embodiment 3

[0023] Example 3: The molding sand for wet core casting of Benma steel pipe fittings adopts the following composition ratio and preparation method.

[0024] Ratio: old sand 550kg, new sand 350kg, bentonite 70kg, starch 3 kg, coal powder 2kg, water 20kg (mass fractions are 55%, 35%, 7.5%, 0.3%, 0.2%, 2%). Among them, the number of new sand and old sand is 70.

[0025] Preparation method: Add new sand and old sand to the sand mixer in sequence, then add coal powder, bentonite, then add starch, and finally add water, stir in the same direction, the stirring speed is 150 rpm, and the stirring time is 120S. The molding sand was obtained after stirring evenly, and the wet compressive strength after the molding sand was made into a wet core was 134kpa.

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Abstract

The invention relates to the technical field of casting, in particular to molding sand suitable for a wet core during malleable iron pipe fitting casting. The molding sand is prepared from the following components of, in percentage by mass, 45%-55% of old sand, 35%-45% of fresh sand, 5%-8% of bentonite, 0.1%-0.4% of starch, 0.1%-0.4% of coal powder and 1%-3% of water. The fresh sand and the old sand are sequentially added into a sand mixer according to a ratio, then the coal powder and the bentonite are added, then the starch is added, finally the water is added, stirring is carried out in thesame direction, and after all the components are uniformly stirred, the molding sand is obtained. The molding sand can be used for core producing for the wet core, and the prepared wet core is high in reusability and strong in binding force. The wet core prepared by the molding sand is high in wet pressure strength, and good in collapsibility and good in air permeability after casting. The use ofthe core iron is cancelled, the waste of the core iron material is avoided, a sorting core iron working procedure is not needed, and the core making efficiency is further improved.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to molding sand suitable for casting wet cores of malleable steel pipe fittings. Background technique [0002] When casting malleable steel pipe fittings, clay-sand wet molding process is often used, and in order to control production costs, clay-sand wet sand cores are mostly used in the production process. The binder for the mixed core sand is made of bentonite. In order to ensure that the sand core has sufficient strength and rigidity, and can withstand the erosion and baking of the sand core by molten iron during the pouring process, one or several core irons are often placed in the middle of the sand core when making the sand core. Only in this way can the quality of the casting be guaranteed. [0003] After pouring, the core iron will be transferred to the next process along with the casting, which brings a lot of work to sorting and sorting the core iron after falling out, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00
CPCB22C1/00
Inventor 艾晨光刘金生陈凤宇韩凯陆秀军
Owner 赤峰市建支管业有限公司
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