The national standard for effective hardened layer distribution is not specified in this, but the actual situation is as described above. Whether the root hardening directly affects the bending fatigue strength of the gear, and to ensure the design strength of the gear, we should test the induction heating quenching. After the hardened layer distribution. In actual production, due to many factors such as equipment, gear modulus, gear size and induction heating process, there are quite a lot of induction heating and quenching gears, which are all hardened by hardening of the root. This kind of quenching method only It can improve the surface contact fatigue strength of the gear tooth surface. Since the root is not hardened and the root is in a tensile stress state, the bending fatigue strength is slightly lower than that of the uninduced hardening. From the American standard AGMA2001-B88, we can see that there is a big difference in the bending fatigue limit between the root hardening and the root hardened hardened gear. It divides the induction hardened gear into two categories: Tooth root hardened (including both contoured and non-contoured type, called type A, its allowable bending stress Sat = 310Mpa; and the other type is the root of the hardened, called type B, its Allowable bending stress Sat = 150Mpa.
From the GB3480-83 standard adopted by Chinese mechanical designers, we can find that the bending fatigue limit of the induction hardened gear is greater than that of the tempered gear, and the data is equivalent to the A-type gear in the American standard. If the distribution of the hardened layer is not specified, then the root hardening of the root does not reach the bending fatigue limit required by the designer, and the product is likely to break early in use. Therefore, the designer should propose the hardened layer distribution requirements to the heat treatment workers according to the service conditions of the gears; and the heat treatment workers should provide the designer with the allowable data of the gear bending fatigue limit of different heat treatment conditions for the designer to select. For gears that improve surface wear resistance, B-type induction hardening can be used to reduce production cost; and for gear bending fatigue performance, A-type induction hardening must be adopted, and hardened layer distribution requirements must be proposed. And the root hardening depth.
For gears produced in large quantities, the hardness test of the gears after the quenching process directly reflects the quenching quality. In actual production, each batch must be inspected first. Only after the first inspection is qualified, mass production can be carried out. In the middle, sampling inspection should be carried out to ensure product quality. For the hardness test of the ferrule type induction hardened gear, the hardness of the tooth top is generally measured by a Rockwell hardness tester in actual production. The hardness of the tooth tip of the high-frequency hardened gear is slightly higher than the hardness of the tooth surface, but the difference is not large. The hardness of the tooth can be used to represent the hardness of the tooth surface. For small modulus gears, the Rockwell A scale can be used for measurement. Gears that cannot be measured with a hardness tester can be measured with a standard file or other methods. However, for the intermediate frequency and super audio hardened gear teeth, the hardness of the tooth top is lower than the hardness of the tooth surface. When the tooth profile is quenched, the tooth top may not be hardened. Therefore, the production unit should provide the part with the hardness of the tooth surface and the hardness measurement according to the processing condition. Determination. Conditional manufacturers are best measured with a tooth surface hardness tester, which can accurately reflect the hardness of induction hardened gears.
When the metallographic inspection is mass-produced, one batch of each batch is inspected for process debugging, and the heat treatment operator can adjust the process parameters in time according to the results of the metallographic examination. The metallographic map in JB/T9204-1999 reasonably reflects the heating temperature of induction hardening, and the heat treatment engineer can select the appropriate quenching process according to the product performance requirements.
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