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Preparation method for railway freight car coupler tail frame integral forging

An integral forging technology for railway wagons, applied in the field of coupler frames of railway wagons, can solve the problems of short fatigue life, low strength, fracture, etc., and achieve the effect of improving comprehensive mechanical properties, increasing strength and service life, and consistent material properties

Inactive Publication Date: 2007-12-12
南京中盛铁路车辆配件有限公司
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Problems solved by technology

[0003]The purpose of the present invention is to overcome the problems of low strength and short fatigue life of the cast steel coupler frame currently used, cracks and fractures often occur in the process of use, and provide a A preparation method for the integral forging of a railway wagon coupler frame by adopting a new type of high-strength alloy steel billet, through billet making, forging, shaping, cutting, machining, heat treatment, shot blasting and other processes

Method used

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  • Preparation method for railway freight car coupler tail frame integral forging
  • Preparation method for railway freight car coupler tail frame integral forging
  • Preparation method for railway freight car coupler tail frame integral forging

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Embodiment Construction

[0030] Referring to the accompanying drawings, the overall size of the coupler frame is now set as: length 932mm, width 200mm, height 366mm, frame plate thickness 28mm as an example for further description as follows:

[0031] (1) Use a sawing machine to cut the material according to the process size (φ185mm round outline), see Figure 2;

[0032] (2) Billet making: Forging billet is to heat the blanked round steel, and then free forge it with an anvil on a 5-ton satin hammer to forge a blank that is similar in shape to the pre-forged blank. The quality of the blank directly affects forging The quality of the blank, the shape of the blank is shown in Figure 3;

[0033] (3) Pre-forging: Since the size and weight of the satin piece is as large as 150 kg, a forging force of 8,000 tons is required for a large friction press to forge with a pre-forging die, as shown in Figure 4 after forming;

[0034] (4) Final forging

[0035] After the pre-forged forging is reheated, put it into...

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Abstract

The high strength alloy steel blank is made through blank making, casting, rectifying, cutting, machining, heat treatment, pill thrusting, and it excels with greatly reduced defects rate, improved in comprehensive feature, doubly increased in part strength and durability. The anti stretch strength reaches 850N / mm2. The impact power Akvj reaches over 27. Through static charge testing, stresses for all the parts are within the allowable scope, increasing fatigue 80%, and durability two times.

Description

technical field [0001] The invention relates to a railway wagon coupler frame produced by the original casting process, which is changed to an integral forging method under the premise of not changing the use function. Background technique [0002] The coupler frame is a key component in the coupler buffer device of railway vehicles, which directly completes the transmission of longitudinal force between vehicles. Historically, coupler frames used on railcars have been cast steel. Due to the unavoidable defects such as pores, inclusions and shrinkage porosity of steel castings, it is difficult to improve the strength. In recent years, due to the speed-up and heavy load of the railway to improve the transportation capacity, the defects of the cast coupler frame have been exposed, fatigue cracks appear prematurely in use, and frequent fracture accidents have brought safety hazards to railway transportation. , has been difficult to meet the safety needs of railway transportat...

Claims

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Application Information

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IPC IPC(8): B23P15/00
Inventor 胡其江
Owner 南京中盛铁路车辆配件有限公司
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