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Manufacturing process for manufacturing large ship-used shafting forge pieces

A marine shafting and manufacturing process technology, applied in the direction of manufacturing tools, furnace types, engine components, etc., can solve the problems of high production cost, low work efficiency, and low utilization rate of steel ingots, so as to reduce production cycle and cost, and eliminate waste point, the effect of low forging cost

Inactive Publication Date: 2018-08-28
WUXI HONGDA HEAVY IND
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  • Abstract
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Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides a manufacturing process for the manufacture of large-scale marine shafting forgings to solve the problems of low steel ingot utilization, low work efficiency and high production cost in the traditional manufacturing process existing in the existing technology

Method used

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  • Manufacturing process for manufacturing large ship-used shafting forge pieces
  • Manufacturing process for manufacturing large ship-used shafting forge pieces
  • Manufacturing process for manufacturing large ship-used shafting forge pieces

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with accompanying drawing:

[0046] as attached Figure 1-3 As shown, the manufacturing process of a large-scale marine shafting forging in this embodiment specifically includes the following steps:

[0047] Step 1, heat treatment before forging:

[0048] S1. Preliminarily heat the steel ingot, and place the forging in a heating furnace with a temperature of ≤500°C for heat preservation, and the heat preservation time is not less than 5 hours;

[0049] S2. Heating at a rate of 50±20°C / hour to slowly heat the forging to 800±20°C;

[0050] S3. Heating at a rate of 100±20°C / hour, so that the steel ingot is slowly heated to 1220±20°C, and then kept warm after being heated to 1220±20°C, and the holding time is not less than 15 hours;

[0051] Step two, forging:

[0052] The steel ingot is forged by two times of upsetting + WHF method of drawing, and the two times of upsetting and drawing are carried out...

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Abstract

The invention provides a manufacturing process for manufacturing large ship-used shafting forge pieces and belongs to the field of ship-used shafting forge pieces. The manufacturing process for manufacturing large ship-used shafting forge pieces specifically comprises the following steps: heat treatment before forging; two-time upsetting and stretching and forging (a WHF method); and thermal treatment on the forged shafting forge pieces. The two-time upsetting and stretching process is reasonable. Cast state tissues can be crushed effectively in first time stretching, and inner hole defects are forged; strip-type plastic inclusions of a core of a blank are fractured to smaller impurities in second time upsetting; the impurities are stretched to disperse impurity granules in the second stretching process, and the action of white points is eliminated effectively by the two-time upsetting process. As a result of temperature change condition in the two-time upsetting and stretching process, the solubility of hydrogen in the forge pieces changes continuously, and distribution and diffusion of hydrogen are facilitated well.

Description

technical field [0001] The invention belongs to the technical field of marine shafting forgings, and in particular relates to a manufacturing process for manufacturing large-scale marine shafting forgings. Background technique [0002] China is a country with many rivers, so shipping has naturally become an industry with great development potential. With the development of the shipbuilding industry, the demand for various forgings used on ships is also increasing. The shafting forgings commonly used in the shipbuilding industry include intermediate shafts, couplings, propeller shafts, stern shafts, propulsion shafts, camshafts, main engine bolts, gearbox bolts and nuts, etc., while the rudder forgings used include rudder stock, rudder For pins, rudder blade flange rudder stock bolts and nuts, carbon steels such as No. 20, No. 25, No. 35, and No. 45 are commonly used, as well as 20MN, 30MN, 34CrNiMo6, 20CrNi2MoA, 42CrMo4HH, and 18CrNiMo7~6 carbon-manganese steel. [0003] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J1/06B21J5/08B21J5/00B21K1/06C21D1/18C21D9/28C21D9/30
CPCB21J1/06B21J5/00B21J5/08B21K1/06C21D1/18C21D9/28C21D9/30
Inventor 张瑞庆张忠明张伟东王忠安马晗珺
Owner WUXI HONGDA HEAVY IND
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