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Forge welding technological method for large circle-shaped thin wall structure parts

A technology of thin-walled structure and process method, which is applied in the direction of furnace type, manufacturing tools, welding equipment, etc., and can solve the problems of material waste and expensive manufacturing cost

Inactive Publication Date: 2007-07-18
CRRC SIFANG CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, people have begun to use forging and heat treatment technology to improve the mechanical properties of the parts, and adopt the integral die forging process for such parts, but the die forging process will cause a lot of waste of materials
According to measurements, the effective utilization rate of materials is less than 40% when using the so-called die forging process to process parts, and the follow-up process requires a large number of cutting processes to meet the requirements, and the manufacturing cost is too expensive

Method used

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  • Forge welding technological method for large circle-shaped thin wall structure parts
  • Forge welding technological method for large circle-shaped thin wall structure parts
  • Forge welding technological method for large circle-shaped thin wall structure parts

Examples

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Embodiment 1

[0027] See Figure 1, Figure 2, Figure 3, Figure 4, Figure 5, Figure 6, Figure 7, Figure 8 and Figure 9.

[0028] A large back-shaped thin-walled structural part, a coupler frame part of a railway freight car, the size of which is 932.5×291×260mm, the hollow size is 740.5×235mm, the thickness of the wall is 28mm, and the height of the edge is 260mm. The so-called large-scale back-shaped thin-walled structural parts are manufactured by forging and welding process. The first step: forging billets, forging according to the product size difference, heating temperature ≤ 1200 ° C, final forging temperature ≥ 800 ° C, billet making equipment 1.5t electro-hydraulic hammer is used; the second step: die forging, heating temperature ≤ 1200 ℃, final forging temperature ≥ 800 ℃, the total projected area of ​​precision billet is 2932cm 2 , the size of the front and back of the worktable is 2400mm, and the equipment adopts a 4000t screw press, with 3 strikes; the third step: simmering and be...

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Abstract

The present invention discloses a forge welding process of large-size square-ring-shaped thin-walled structure component. Said forge welding process includes the following steps: (1), forging raw material to obtain blank; (2), die forging-forming; (3) heat bending-forming by means of die; (4) making group welding, before welding making preheating treatment, adopting welding mould and adopting mixed gas shielded welding, after welding making heat-insulating treatment; and (5) making thermal refining treatment.

Description

Technical field [0001] The invention relates to a metal forming process, in particular to a forging welding process with less cutting and no cutting. Background technique [0002] The parts of the large back-shaped structure are characterized by hollow, thin-walled and high-edge. The parts are generally manufactured by casting process. Since the manufacturing method itself will cause defects such as shrinkage and cracks in the manufactured products, the mechanical properties of the manufactured parts cannot meet the requirements of high strength, fatigue resistance and long life. Take the locomotives, passenger cars and freight cars used on the railway as an example. With the increase of driving speed again and again, many parts produced by casting process in the past have poor vibration resistance, impact resistance, strength rigidity and fatigue resistance. And other mechanical properties can not meet the requirements, people began to seek new technology to manufacture pa...

Claims

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Application Information

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IPC IPC(8): B23P23/04B21J5/02B21J1/04B21D7/00B21D7/16B23K9/16C21D9/50C21D11/00
Inventor 刘元功张艳萍阎旭
Owner CRRC SIFANG CO LTD
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