Process for eliminating Tang Ke defects of gray iron castings
A technology of gray cast iron, which is applied in the field of Tangke defect elimination technology of gray iron castings, can solve the problems of slow heat dissipation, uneven inoculation, slag inclusion, etc., and achieve the effect of preventing slag inclusion in castings and uniform inoculation more conveniently
Inactive Publication Date: 2021-08-10
浙江汉声精密机械有限公司
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Problems solved by technology
[0002] Existing schemes in the industry; 1. Control of manganese and sulfur elements. The existing process improves the hardness of castings through manganese, and the control range of sulfur is wide (0.05-0.12%), which can also meet the general quality requirements. Disadvantages: the distribution of A-shaped graphite in castings is not 2. Smelting and pouring process: Melting of molten iron → quenching and tempering → heating up to the temperature of the soup (generally not exceeding 1460°C) → breaking the slag and pouring the soup. Disadvantage: the raw material of the molten iron is Most of them include raw materials such as pig iron and manganese, and pig iron contains more coarse graphite. To destroy these coarse graphite, it needs to be overheated at a high temperature of at least 1500 degrees for 5 to 10 minutes.
Graphite core is formed by inoculation (silicon), disadvantages: uneven inoculation, uneven distribution of graphite
4. Gate process: centralized gate, disadvantages; slow heat dissipation, easy to produce coarse graphite
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[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0015] see figure 1 , The present invention provides a technical solution: a Tangke defect elimination process for gray iron castings, comprising the following steps: 1. Control of manganese and sulfur elements: the S content in molten iron is controlled at 0.08-0.09%. Mn is controlled at 0.8-1.0%. (The mutual ratio is 1:10-12). It can not only ensure the A-shaped graphite, but also prevent the generation of slag. ℃→keep warm for 5-10 minutes→turn off the pow...
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The invention discloses a process for eliminating Tang Ke defects of gray iron castings. The process comprises the following steps that S1, raw materials are added, and the sulfur element and the manganese element are controlled to be 0.08-0.09% and 0.8-1.0% of the overall mass; S2, the raw materials are smelted into molten iron, tempering is conducted, then the temperature is increased to 1500-1520 DEG C, heat preservation is conducted, power-off cooling is conducted, the temperature is reduced to the required temperature, and deslagging, soup discharging and pouring are conducted; S3, the molten iron is poured into a ladle at a time and conveyed to a wire feeding station, and inoculation wires are evenly inserted into the molten iron for inoculation through a wire feeder; and S4, casting is conducted by adopting a dispersed pouring gate process. According to the process, slag inclusions of the castings are prevented, thick graphite is prevented from being formed through graphite refinement, A-shaped graphite is guaranteed, and inoculation is more uniform and more convenient.
Description
technical field [0001] The invention relates to the technical field of processing technology of gray iron castings, in particular to a process for eliminating Tang Ke defects of gray iron castings. Background technique [0002] Existing schemes in the industry; 1. Control of manganese and sulfur elements. The existing process improves the hardness of castings through manganese, and the control range of sulfur is wide (0.05-0.12%), which can also meet the general quality requirements. Disadvantages: the distribution of A-shaped graphite in castings is not 2. Smelting and pouring process: Melting of molten iron → quenching and tempering → heating up to the temperature of the soup (generally not exceeding 1460°C) → breaking the slag and pouring the soup. Disadvantage: the raw material of the molten iron is Most of them include raw materials such as pig iron and manganese, and pig iron contains more coarse graphite. To destroy these coarse graphite, it needs to be overheated at ...
Claims
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IPC IPC(8): C21C1/08
CPCC21C1/08
Inventor 李艳文杜六一
Owner 浙江汉声精密机械有限公司