Casting process for producing precoated sand shell core rotor with steel shots as filling material

A casting process and filler technology, which is applied in the field of casting process for producing grease-coated sand shell core rotors, can solve the problems of unqualified metallographic structure and mechanical properties of the body, shrinkage holes and shrinkage porosity in the center of castings, and slow cooling rate of molten iron. and other problems, to solve the internal defects of the rotor, improve the metallographic structure, and reduce the production cost.

Inactive Publication Date: 2019-04-26
济宁市兖州区联诚机械零部件有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Landfilling with green sand or furan resin sand has high production cost and low production efficiency
The biggest disadvantage is that in the production of ductile iron rotors, due to the slow heat dissipation of the sand mold after pouring, the cooling speed of the molten iron after pouring is slow, shrinkage cavities and shrinkage porosity are easily produced in the center of the casting, and the metallographic structure and mechanical properties of the body are unqualified

Method used

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  • Casting process for producing precoated sand shell core rotor with steel shots as filling material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] refer to figure 1 , a casting process for producing a grease-coated sand shell core rotor with steel shot 4 as a filler, comprising the following steps:

[0026] Step 1: use the coated sand to make the shell core and the built-in core 7, combine the shell cores to form the coated sand shell 2, and put the built-in core 7 into the coated sand shell 2;

[0027] Step 2: Put the coated sand shell 2 into the container 1, and fill the container 1 so that the steel shot 4 wraps the coated sand shell 2, and finally shake the steel shot 4 firmly;

[0028] Step 3: place sprue cup 6 and riser on top of coated sand shell 2;

[0029] Step 4: The molten iron of the ductile cast iron is smoothly poured into the coated sand shell 2 through the sprue cup 6, and cast into shape;

[0030] Step 5: After the molten iron is completely solidified, the cast rotor 3 is obtained.

[0031] The specification of the steel shot 4 in the said step 2 is 3mm. The temperature of molten iron casting ...

Embodiment 2

[0033] refer to figure 1 , a casting process for producing a grease-coated sand shell core rotor with steel shot 4 as a filler, comprising the following steps:

[0034] Step 1: use the coated sand to make the shell core and the built-in core 7, combine the shell cores to form the coated sand shell 2, and put the built-in core 7 into the coated sand shell 2;

[0035] Step 2: Put the coated sand shell 2 into the container 1, and fill the container 1 so that the steel shot 4 wraps the coated sand shell 2, and finally shake the steel shot 4 firmly;

[0036] Step 3: place sprue cup 6 and riser on top of coated sand shell 2;

[0037] Step 4: The molten iron of the ductile cast iron is smoothly poured into the coated sand shell 2 through the sprue cup 6, and cast into shape;

[0038] Step 5: After the molten iron is completely solidified, the cast rotor 3 is obtained.

[0039] In the first step, a core shooting machine is used to make the shell core and the built-in core 7 . In t...

Embodiment 3

[0041] refer to figure 1 , a casting process for producing a grease-coated sand shell core rotor with steel shot 4 as a filler, comprising the following steps:

[0042] Step 1: use the coated sand to make the shell core and the built-in core 7, combine the shell cores to form the coated sand shell 2, and put the built-in core 7 into the coated sand shell 2;

[0043] Step 2: Put the coated sand shell 2 into the container 1, and fill the container 1 so that the steel shot 4 wraps the coated sand shell 2, and finally shake the steel shot 4 firmly;

[0044] Step 3: place sprue cup 6 and riser on top of coated sand shell 2;

[0045] Step 4: The molten iron of the ductile cast iron is smoothly poured into the coated sand shell 2 through the sprue cup 6, and cast into shape;

[0046] Step 5: After the molten iron is completely solidified, the cast rotor 3 is obtained.

[0047] In the first step, a core shooting machine is used to make the shell core and the built-in core 7 . In t...

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Abstract

The invention discloses a casting process for producing a precoated sand shell core rotor with steel shots as a filling material, and relates to the technical field of casting. The casting process comprises the following steps that firstly, a shell core and a built-in core are manufactured through precoated sand, the shell core is combined into a precoated sand shell, and the built-in core is placed in the precoated sand shell; secondly, the precoated sand shell is placed in a container, the container is filled with the steel shots, thus, the precoated sand shell is wrapped with the steel shots, and finally the steel shots are compacted through vibration; thirdly, a pouring cup and a riser are arranged at the top of the precoated sand shell; fourthly: molten iron of nodular cast iron is injected into the precoated sand shell smoothly through the pouring cup, and casting molding is conducted; and fifthly, after the molten iron is completely cured, the casting rotor is obtained. The functions of rapid heat absorption and heat transfer chilling of the steel shots are used for increasing the cooling speed of the molten iron, the cooling speed of the cast iron eutectic stage is changed,an as-cast microstructure of the cast iron can be changed in a large range, and thus casting structure is dense.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a casting process for producing a grease-coated sand shell core rotor by using steel shot as a filler. Background technique [0002] As a casting process, shell-shaped production castings can be produced without investing in sand treatment, sand mixers, and production lines. As long as the landfill is tight, it can be cast into shape. Landfilling with green sand or furan resin sand has high production cost and low production efficiency. The biggest disadvantage is that in the production of ductile iron rotors, due to the slow heat dissipation of the sand mold after pouring, the cooling speed of the molten iron after pouring is slow, shrinkage cavities and shrinkage porosity are easily produced in the center of the casting, and the metallographic structure and mechanical properties of the body are unqualified. Contents of the invention [0003] The invention proposes a casting ...

Claims

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Application Information

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IPC IPC(8): B22C9/02B22C9/22B22D27/04
CPCB22C9/02B22C9/22B22D27/04
Inventor 栾绪祥
Owner 济宁市兖州区联诚机械零部件有限公司
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