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Production process for high-strength sand moulds and cores added with novel chill

A high-strength, sand-molded technology, used in manufacturing tools, metal processing equipment, casting molds, etc., can solve the problems of cooling rate casting shrinkage, fast cooling rate, and high price of falling ore, so as to improve casting production efficiency and simplify casting. Process steps, the effect of low production process cost

Inactive Publication Date: 2015-06-03
天瑞集团铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Casting refers to the processing method of pouring the material that is liquid at room temperature but solidified soon into a mold of a specific shape and waits for it to solidify and form. It is an ancient metal thermal processing process. The casting process includes material preparation, modeling, core making, In metal smelting, pouring and solidification steps, chilled iron is commonly used in the casting process. In casting production, chilled iron plays an important role in improving the effect of riser and preventing shrinkage cavity and shrinkage of castings, ensuring the quality of castings. The mechanism of iron is to accelerate the cooling rate of a certain part of the cast iron during the pouring process. Because of its structure, the wall thickness of each part of the cast iron is uneven. The thicker part of the cast has a slower cooling rate during the cooling process and a thicker wall The cooling speed of the thin part is fast, and this uneven cooling rate can easily cause shrinkage cavities or cracks in the casting. In order to avoid this phenomenon, cold iron is often used to balance the cooling speed of each part of the casting during casting; the traditional casting process Most of the cold iron materials used are plug-in type or some block metals, but the effect of this kind of cold iron is poor and it is easy to cause cracks in the casting. Castings with complex shapes are difficult to make during use, which often brings great troubles to casting production

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0015] Set forth below the specific embodiment of the present invention: a kind of manufacture technology that adds the high-strength sand mold of novel cold iron, core, process step is as follows:

[0016] Step 1: One piece of raw sand for casting, add steel shot equivalent to 30%-100% of the total weight of the raw sand, the particle size of the steel shot is 0.5-1.3mm, and then add 2.5-7% of the total weight of the raw sand and steel shot The water glass is used as an adhesive, and then put into a sand mixer and mixed evenly to obtain a mixture for later use;

[0017] Step 2. Select the raw sand for casting according to the amount of sand required in the casting process, add water glass equivalent to 6%-8% of the total amount of raw sand as an adhesive, and then put it in a sand mixer and mix it evenly before mixing. spare material;

[0018] Step 3, take the mixture obtained in step 2 for molding and core making. In the process of molding and core making, place the mixture...

Embodiment 1

[0025] A manufacturing process of high-strength sand molds and cores added with new chilled iron, the process steps are as follows:

[0026] Step 1. One piece of raw sand for casting, add steel shot equivalent to 30% of the total weight of the raw sand, the particle size of the steel shot is 0.5mm, and then add water glass with a total weight of 7% of the raw sand and steel shot as an adhesive , and then put it into the sand mixer and mix it evenly to get the mixture for later use;

[0027] Step 2. Select raw sand for casting according to the amount of sand required in the casting process, add water glass equivalent to 6% of the total amount of raw sand as an adhesive, and then put it into a sand mixer and mix it evenly to obtain a mixture for use;

[0028] Step 3, take the mixture obtained in step 2 for molding and core making. In the process of molding and core making, place the mixture obtained in step 1 as chill iron in the position where the sand mold and core need to be ...

Embodiment 2

[0032] A manufacturing process of high-strength sand molds and cores added with new chilled iron, characterized in that: the process steps are as follows:

[0033] Step 1. One part of raw sand for casting, add steel shot equivalent to 70% of the total weight of the raw sand, the particle size of the steel shot is 0.9mm, and then add water glass with 5% of the total weight of the raw sand and steel shot as an adhesive , and then put it into the sand mixer and mix it evenly to get the mixture for later use;

[0034] Step 2. Select raw sand for casting according to the amount of sand required in the casting process, add water glass equivalent to 7% of the total amount of raw sand as an adhesive, and then put it into a sand mixer and mix it evenly to obtain a mixture for use;

[0035] Step 3, take the mixture obtained in step 2 for molding and core making. In the process of molding and core making, place the mixture obtained in step 1 as chill iron in the position where the sand m...

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Abstract

The present invention relates to a casting process, namely a production process for high-strength sand moulds and cores added with a novel chill, including the steps of producing the chill, molding, core making, drying, etc., and is a good solution to various problems existing in use of the traditional chill.

Description

technical field [0001] The invention relates to a casting technology, in particular to a manufacturing technology of high-strength sand molds and cores added with novel cold iron. Background technique [0002] Casting refers to the processing method of pouring the material that is liquid at room temperature but solidified soon into a mold of a specific shape and waits for it to solidify and form. It is an ancient metal thermal processing process. The casting process includes material preparation, modeling, core making, In metal smelting, pouring and solidification steps, chilled iron is commonly used in the casting process. In casting production, chilled iron plays an important role in improving the effect of riser and preventing shrinkage cavity and shrinkage of castings, ensuring the quality of castings. The mechanism of iron is to accelerate the cooling rate of a certain part of the cast iron during the pouring process. Because of its structure, the wall thickness of each...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/10B22C9/02B22C9/12
Inventor 万荣华杨永乾桂建元申小莉李锋亮李建立
Owner 天瑞集团铸造有限公司