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High-frequency quenching gear and heating processing technology thereof

A high-frequency quenching and tempering treatment technology, applied in the field of gear processing, can solve the problems that the gear cannot reach the hardness and core impact toughness, and achieve the effects of grain refinement, short holding time, and more austenite nucleation

Inactive Publication Date: 2012-01-04
DALIAN QIANBAO CAST IRON FOUNDRY
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Problems solved by technology

In the process of processing, quenching treatment means that the tooth surface meets the specified hardness requirements. With the development of quenching technology, high-frequency quenching treatment equipment is now appearing, but if the previous gearing process is used to maintain the composition of the previous gearing material, the production The out-of-the-box gears cannot meet our required hardness and core impact toughness

Method used

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Embodiment Construction

[0013] The raw material is QT700-2 ductile iron, which increases the content of Cu element and reduces the content of Mn, Cr and Si. The determined composition range is: C: 3.50-3.70, Si: 2.3-2.5. Mn: 0.3-0.5, Cr: 0.15-0.25, Cu: 0.6-0.8, wherein the harmful components and their weight percentages are: P≤0.07, S≤0.03.

[0014] After dispensing and casting 300 pieces of gear blanks according to the above ingredients, the test results of the substrate are as follows: the tensile strength is 764MPa, the yield strength is 572MPa, the elongation is 4.2%, and the hardness HB269 meets the requirements of QT700-2.

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Abstract

The invention discloses a high-frequency quenching gear and a heating processing technology thereof. The high-frequency quenching gear is characterized in that the core has high strength and high impact toughness after high-frequency quenching, tooth surface has high hardness and high abrasion resistance, and the high-frequency quenching gear can pass a 720-hour fatigue test. The invention not only provides the proportion relationship in cast iron but also provides the heating processing technology of the cast iron. After cast, shaped and processed, the cast iron is heated by high frequency and is quickly carried out with oil quenching treatment at the temperature of 860+ / -20 DEG C; the temperature of 420+ / -10 DEG C is kept for 120 minutes for tempering at low temperature. After poured bythe ingredient of the invention, the gear cast iron with the component has tensile strength of 764 MPa and yield strength of 572 MPa and specific elongation of 4.2%, and hardness HB 269 satisfies theQT700-2 requirements. After processed, the high-frequency quenching gear satisfies the 720-hour fatigue test after heating processing of the invention.

Description

technical field [0001] The invention belongs to the field of gear processing, in particular to producing a high-frequency quenching gear and the heat treatment process. Background technique [0002] The processing of gears is mostly divided into the processing of tooth blanks, the initial machining of tooth blanks, tooth profile processing, heat treatment stage, and tooth profile finishing. With the development of mechanical technology, the requirements for gear hardness are also different. In the process of processing, quenching treatment means that the tooth surface meets the specified hardness requirements. With the development of quenching technology, high-frequency quenching treatment equipment is now appearing, but if the previous gearing process is used to maintain the composition of the previous gearing material, the production The out-of-the-box gears cannot reach the hardness and impact toughness we require. Therefore, we have to improve this from the material co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C21D5/00C21D1/18
Inventor 谢新俊李新栋
Owner DALIAN QIANBAO CAST IRON FOUNDRY
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