How to improve the quality of gear forgings
How to improve the quality of gear Forgings? Shanghai Zhiyuan Flange Forging Co., Ltd. pointed out that hardness is an important quality inspection index for heat treatment of gear forgings. It is not only because the hardness test is fast, simple and does not damage the forgings, but also because other mechanical properties can be inferred from the hardness values. Rationally determining the hardness values after heat treatment will give forgings good service performance and play an important role in improving quality and prolonging durability.
In addition to the required hardness value, other mechanical properties must be specified for improving the quality of gear forgings:
1. Reasonable combination of strength and toughness. Usually the strength and toughness of steel materials are mutually reinforcing. For structural forgings, one-time impact toughness is often used as the safety criterion to pursue the index of high toughness without sacrificing strength, resulting in heavy and heavy mechanical products and short service life. On the contrary, for tooling and dies, high hardness and strength (torsional strength) are sought in order to improve wear resistance, while the effect of toughness on reducing die breakage and chipping is neglected and the service life is not long. Therefore, the working conditions and failure modes of forgings should be investigated and analyzed, and the strength and toughness indexes to be selected for forgings should be determined according to the reasonable combination of strength and toughness.
2. Correctly handle the relationship between material strength, structural strength and system strength. The various material strength indices are measured with standard samples and depend on the material's structural state (including surface state, residual stress and stress state). The structural strength of forgings is affected by size factors and notch effect, while the system strength is related to the interaction with other forgings. There are significant differences between the three, e.g. the fatigue strength of the smooth test rod of the material is high, but the fatigue strength of the material may be low. Therefore, for some important parts, it is appropriate to determine mechanical properties based on simulation test results.
3. The strength matching of combination parts should be reasonable. A large number of tests and practical applications have shown that the service life can be extended when the combination components (e.g. worm gear, chain sprocket, ball and collar, drive gear, etc.) achieve strength matching. For example, the hardness of the ball should be 2HRC higher than that of the collar, and the surface hardness of the rear axle drive gear should be 2-5HRC higher than that of the driven gear seat. The same steel is treated into friction pairs with the same hardness by the same method, and the wear resistance is poor.
4. For Surface-strengthened forgings, the core and surface strength should be reasonably matched. When surface-hardened parts (such as carburizing quenching, carbonitriding quenching, nitriding, induction quenching, etc.), with a certain depth of hardening layer, the center should have appropriate strength to achieve a good match between the center and surface strength, so as to ensure a high service life of forgings. If the strength of the heart is too low, the source of fatigue tends to occur in the transition zone, which leads to a decrease in fatigue performance. If the core strength is too high, the surface residual compressive stress is low and the fatigue life is not long.
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