Novel hollow shaft manufacturing method
AssigneeChangshu Synergy Automobile Parts Co., Ltd
InventorYasuhiro KUWAHARA
Life of this patent
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Abstract
A novel hollow shaft manufacturing method includes the steps of hollow cold-rolling of seamless steel pipe, cutting, annealing and surface treatment, forming by forging, precision machining, and heat treatment. The present invention uses a new process instead of the traditional process. The forging process using high-strength cold-rolled seamless steel pipes has fewer steps than using bar stock: saving three forging passes, one annealing pass and one surface treatment pass, hence saving about ½ in time and cost, shortening the cycle, reducing costs, reducing energy consumption and reducing the three wastes, increasing the stock utilization rate to about 68%, and reducing the inter-process cost calculated by weight. For the same products, using this process can shorten the production cycle.
Claims2
A new type of hollow shaft manufacturing method, wherein it comprises the following steps:
- Step 1:
- Hollow cold-rolling of seamless steel pipes, enabling the inner and outer diameters of the seamless steel pipes meet the size requirements, in lengths of 4-6 m;
- Step 2:
- Cutting. The cold-rolled seamless steel pipes are cut to the required lengths with a circular saw;
- Step 3:
- Annealing and surface treatment. After cutting, the cold-rolled seamless steel pipes are softened by spheroidizing annealing or traditional annealing, and then subjected to phosphorous saponification treatment or environmentally friendly surface lubrication treatment;
- Step 4:
- Forming by forging. Forging is conducted with a long-stroke multi-stage forging machine;
- Step 5:
- Precision machining. Both turning and milling steps are conducted on the forged hollow shafts;
- Step 6:
- Heat treatment. Quenching and tempering or carburizing heat treatment steps are conducted on the hollow shafts after precision machining.
Dependencies are inferred from the claim text.