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Forging control method of large-specification stepped shaft component

A control method and large-scale technology, applied in the field of steel material forging, can solve the eccentricity problems of shafts with large step difference, and achieve the effect of avoiding the eccentricity of forgings, improving the utilization rate of product materials and production efficiency, and solving the eccentricity problem.

Inactive Publication Date: 2020-07-28
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a large-scale stepped shaft that can improve material utilization and production efficiency, reduce production costs, stabilize product quality, and solve the problem of eccentricity of large-step differential shafts. Parts forging control method

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  • Forging control method of large-specification stepped shaft component
  • Forging control method of large-specification stepped shaft component
  • Forging control method of large-specification stepped shaft component

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Embodiment Construction

[0019] As shown in the figure, the forging of large-scale shafts is taken as an example, that is, the manufacture of 20CrMo4 roller shaft forgings with a specification of φ1170mm is taken as an example to illustrate.

[0020] Such as figure 1 As shown, in the forging blank drawing of the roller shaft, the unit of dimension in the drawing is mm. Depend on figure 1 It can be seen that the forging of the roller shaft has a large diameter and a large step difference (720mm). In order to improve the utilization rate of materials, reduce the number of times of upsetting, and improve forging efficiency, 2 times the size of forging is used in production, and the utilization rate of materials is increased to 73% (the utilization rate of materials in traditional forging methods is about 65%).

[0021] Such as figure 2 As shown in the shoulder cutting diagram of the steel ingot, before heating in the furnace, the riser of the steel ingot should be cut first: use a carbon arc gouging ...

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Abstract

The invention relates to a forging control method of a large-specification stepped shaft component. A forging drawing design is optimized, and a steel ingot is subjected to scarfing and shoulder cutting treatment before forging, so that a riser material is prevented from extending to a steel ingot body during forging production; special before-forging air-cooling temperature control heating is made, so that temperature stress and structural stress of the low-carbon steel ingot are overcome, the surface crack problem of a forge piece is avoided, the rejection rate is reduced, and the machiningallowance is reduced; a special tool is utilized to carry out notch design, firstly, triangular iron is used for nicking, and then a special narrow block is used for notch deformation, so that the material stripping problem at a step is reduced, and the problem that process materials are added due to wide anvil deformation of the notch is solved; and during forming deformation, narrow anvil forging is adopted, a square-octagon-hexadecagon-circle forging deformation mode is utilized in the small step deformation process, and the feeding amount of each time is controlled to be 0.6-0.85 time of the height of a blank before pressing, so that the eccentric problem is avoided, the machining allowance is reduced, the material utilization rate is improved, the production cost is reduced, and the product quality is stable.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material forging, and relates to a large-size stepped shaft suitable for 20CrMo4 large-size shafts that can avoid forging eccentricity, improve material utilization and production efficiency, reduce production costs, and have high product quality stability. Forging control method of parts. Background technique [0002] The traditional forging production method of large-scale stepped shafts is as follows: steel ingots are sent hot or cold ingots are heated in the furnace. The process uses a lot of materials, which greatly reduces the material utilization rate, and the product production cost is high; the step difference is large, and it is easy to be eccentric during forging, which seriously affects the product qualification rate. [0003] Therefore, the current conventional forging production methods for large-scale stepped shafts generally have problems such as low material utilization, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/06
CPCB21K1/06
Inventor 叶玉娟高全德张凯亮赵东
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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