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Method for preparing base of vertical annealing furnace

A vertical annealing furnace and annealing furnace technology, applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of weak elongation, insufficient tensile strength and compressive strength, shrinkage cavity, etc., and achieve tensile strength The effect of strengthening strength and compressive strength, improving mechanical properties and flexibility, and hindering the formation of carbides

Active Publication Date: 2012-06-13
SICHUAN CHUANJIAN PIPES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the base of the current vertical annealing furnace does not use the lost foam casting method, let alone the bottom injection method, so there will inevitably be a high scrap rate, insufficient mechanical properties, low flexibility, insufficient tensile strength and compressive strength, and Insufficient heat resistance and fatigue resistance, weak elongation
General manufacturers mainly choose to use wood to make molds. The cost of the mold is high, the time-consuming processing cycle is long, and the traditional sand casting process is adopted, the molding operation is labor-intensive, the dimensional accuracy of the casting is poor, the internal structure of the casting is loose, there are shrinkage cavity defects, and the scrap rate is high. , low mechanical properties, short service life of castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method for a vertical annealing furnace base, characterized in that the following steps are adopted:

[0032] A), the base model of the annealing furnace is made of polystyrene;

[0033] B), mix pig iron, scrap steel, ferromanganese, and ferrosilicon into ingredients, and smelt them in an electric furnace;

[0034] C) Spheroidizing the molten iron melted in step B) by means of spheroidizing by flushing to obtain 3.7% carbon, 0.8% manganese, 3.5% silicon, and 0.05% magnesium, and the rest is iron ;

[0035] D), the molten iron that C) step obtains is kept on 1380 ℃;

[0036] F) Put the base model of the annealing furnace obtained in step A) into the sandbox, and inject the molten iron obtained in step D) from the bottom of the sandbox using the lost foam casting process. After the model is completely vaporized, cool it naturally to room temperature to form the base of the annealing furnace .

[0037] In the step F), the negative pressure in the sandbox ...

Embodiment 2

[0041] A preparation method for a vertical annealing furnace base, characterized in that the following steps are adopted:

[0042] A), the base model of the annealing furnace is made of polystyrene;

[0043] B), mix pig iron, scrap steel, ferromanganese, and ferrosilicon into ingredients, and smelt them in an electric furnace;

[0044] C) Spheroidizing the molten iron melted in step B) by means of spheroidizing by flushing to obtain 3.9% carbon, 1.0% manganese, 4.0% silicon, and 0.055% magnesium, and the rest is iron ;

[0045] D), the molten iron that C) step obtains is kept on 1400 ℃;

[0046] F) Put the base model of the annealing furnace obtained in step A) into the sandbox, and inject the molten iron obtained in step D) from the bottom of the sandbox using the lost foam casting process. After the model is completely vaporized, cool it naturally to room temperature to form the base of the annealing furnace .

[0047] In the step F), the negative pressure in the sandbox...

Embodiment 3

[0051] 1, a kind of preparation method of vertical annealing furnace base, it is characterized in that adopting following steps:

[0052] A), the base model of the annealing furnace is made of polystyrene;

[0053] B), carry out batching of pig iron, steel scrap and ferromanganese, ferrosilicon alloy, melt with electric furnace;

[0054] C) Spheroidizing the molten iron melted in step B) by means of spheroidizing by flushing method to obtain molten iron containing 3.8% carbon, 0.9% manganese, 3.75% silicon, 0.0525% magnesium, and the rest is iron ;

[0055] D), the molten iron that C) step obtains is kept on 1390 ℃;

[0056] F) Put the base model of the annealing furnace obtained in step A) into the sandbox, and inject the molten iron obtained in step D) from the bottom of the casting by using the lost foam casting process. After the model is completely vaporized, cool it naturally to room temperature to form the base of the annealing furnace.

[0057] In the step F), the n...

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Abstract

The invention discloses a method for preparing a base of a vertical annealing furnace. The method provided by the invention is characterized in that a lost foam casting technology is adopted; molten iron is injected into a mold from the bottom to form a casting; a pour-over spheroidizing technology is adopted; and a spheroidizing inoculation technology is adopted. The base obtained by the method has advantages of good mechanical properties, good flexibility, high tensile strength, high compression strength, low rejection rate, high heat resistance, high fatigue resistance, and large elongation.

Description

technical field [0001] The invention discloses a method for preparing a base of a vertical annealing furnace, and particularly belongs to a method for preparing a base of a vertical annealing furnace. Background technique [0002] At present, there are two main annealing processes used in hot mold centrifugal large tubes: desktop annealing furnace and vertical annealing furnace. Due to the high heat utilization rate of the vertical annealing furnace, the cost of natural gas consumption is better than that of the desktop, so it is still popularized and used today. [0003] However, the base of the current vertical annealing furnace does not use the lost foam casting method, let alone the bottom injection method, so there will inevitably be a high scrap rate, insufficient mechanical properties, low flexibility, insufficient tensile strength and compressive strength, and Insufficient heat resistance and fatigue resistance, weak elongation. General manufacturers mainly choose ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22D1/00
Inventor 韦良义刘树良王志刚苟克明李文良岳阳
Owner SICHUAN CHUANJIAN PIPES
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