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A gear shaft and process technology, applied in the direction of manufacturing tools, metal processing equipment, furnace types, etc., can solve the problems of increasing forgings, reducing mechanical properties, etc., and achieving the effects of less material loss, good mechanical properties, and reduced manufacturing costs.
Inactive Publication Date: 2021-11-26
杭州金越晟重型机械有限公司
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Abstract
Description
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Problems solved by technology
[0004] In order to solve some or some technical problems existing in the prior art, the present invention provides a gear shaft forging process, which can solve the problems of reduced mechanical properties and increased forging damage of forgings due to improper heat treatment after the blank is formed. , so that the qualified rate of the finished product is high, the service life is long, the technological process is simple, the operation is convenient, the processing uniformity is good, the material loss is small, the mechanical properties of the obtained product are good, the structure is stable, the manufacturing cost is reduced, and the production efficiency and profit are improved.
Method used
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Effect test
Embodiment 1
[0031] A gear shaft forging process, including S1, melting raw materials into liquid through electric arc furnace (EAF) or converter (BOF), and then introducing into refining furnace (LF furnace) for final deoxidation and desulfurization of molten steel, and finally through vacuum The degassing furnace (VD / RH furnace) melts the solution in the refining furnace to form a steel ingot for die casting;
[0032] S2. Pre-treatment: Grinding, polishing, rolling, and degreasing the surface of the steel ingot die-casting to remove surface defects of the steel ingot die-casting; the grinding depth does not exceed 1.5% of the effective size, and the grinding depth-to-width ratio is less than 1:6. It is used to remove surface cracks, pits, scars, pores and other defects of steel ingots, and the defects of UT inspection are not greater than φ2;
[0033] The grinding depth of the steel ingot die-casting surface should ensure that no local defects exceeding the nominal diameter tolerance are...
Embodiment 2
[0044] In the scheme of Example 1, step S3 in Example 1 can be removed, and the steel ingot is directly processed in step S4 for forging after the pre-treatment of the steel ingot, and then the forged steel ingot is molded by isothermal normalizing, normalizing, Quenching + high temperature tempering, normalizing + high temperature tempering, annealing post-forging cooling method for heat treatment, the newly added post-forging heat treatment heating equipment, according to the requirements of SAEAMS2750E-2012 standard level 5, controlled within ±14 ℃. Putting the heat treatment of the entire gear shaft after forging can also achieve the effect of the first embodiment.
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Abstract
The invention provides a gear shaft forging process. The gear shaft forging process comprises the steps that S1, raw materials are smelted through an electric arc furnace or a converter, a refining furnace and a vacuum degassing furnace to form steel ingot die casting; S2, earlier stage treatment is carried out; S3, heat treatment is carried out on the steel ingot die casting subjected to earlier stage treatment, and the heat treatment mode is controlled cooling, spheroidizing annealing, annealing, normalizing and high-temperature tempering; S4, forging treatment is carried out on the steel ingot die casting; S5, the forge piece is cooled to 400-450 DEG C, and then annealing treatment is carried out; and S6, rough turning, ultrasonic flaw detection and mechanical property testing are carried out on the forge piece, and finally a finished product is put in storage. The problems that the mechanical performance of a blank is reduced and forging damage of the forge piece is increased due to improper heat treatment after the blank is formed can be solved, the qualified rate of a finished product is high, the service life is long, the technological process is simple, operation is convenient, machining uniformity is good, material loss is small, the obtained product is good in mechanical performance and stable in structure, the manufacturing cost is reduced, and the production efficiency and benefits are improved.
Description
technical field [0001] The invention relates to the technical field of gear shaft forging technology, in particular to a gear shaft forging technology. Background technique [0002] The gear shaft is a mechanical part that supports the rotating parts and rotates with them to transmit motion, torque or bending moment. It will inevitably involve forging and heat treatment in the production process. Generally, the heat treatment of the gear shaft is first arranged after the shaft blank is forged. Annealing treatment to eliminate forging internal stress, refine grains, improve cutting performance during machining, arrange quenching and tempering treatment after rough machining, and arrange partial quenching treatment on the teeth after half machining to make it meet the designed hardness requirements , to ensure the wear resistance of these surfaces, while the subsequent finishing process can eliminate quenching deformation. However, forging requires materials not only to have ...
Claims
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Application Information
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