Bell-shaped shell for universal joint and its processing technology

Abstract

The invention discloses a universal joint bell-shaped shell and a machining process. The shell mainly comprises a bell jar section, a first cylindrical segment, a spline segment and a second cylindrical segment, wherein the joint between the first cylindrical section and the second cylindrical section is provided with a smooth rounded corner transition, the material used by the bell-shaped shellcomprises the following components of, by percentage, 54%-68% of Fe, 1.5%-1.8% of Cr, 1.4%-1.7% of Ni, 0.15%-0.21% of C, less than or equal to 0.4% of Si, 0.5%-0.9% of Mn, less than or equal to 0.025%of P, less than or equal to 0.035% of S, 0.25%-0.35% of Mo, the balance impurities, and a blank of the bell-shaped shell is prepared by adding powder of the C, the Si, the Mn and the Mo during drawing and hot forging on a mixed matrix prefabricated by the Fe, the C, the Cr and the Ni. According to the shell, the structure is simple, the hardness is large, meanwhile, the self-lubricating propertyand the wear resistance are achieved, forming grinding is adopted, so that the machining precision on a spherical surface is greatly improved, the running precision is improved, and the service life of the shell is greatly prolonged through a blank drawing and forging forming technology and heat treatment.

Description

technical field [0001] The invention relates to the technical field of fixtures for automobile parts, in particular to a bell-shaped housing for universal joints and a processing technique. Background technique [0002] The existing bell-shaped shells for universal joints generally need to drill the small end face hole and tap the small end face hole, and because the product has a groove on the tooth part after the gear hobbing, the purpose of the groove is to install the product. After the car, it plays the role of connecting and fixing with it, and the purpose of drilling and tapping on the small end face is also to play a role of connecting and fixing after loading the car. Therefore, the role of the tooth groove and the drilling and tapping are repeated. As a result, the process route becomes longer and the process cost is increased. On the other hand, the processing time is greatly increased, thereby reducing the processing efficiency; in addition, the existing bell-sha...

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Problems solved by technology

[0002] The existing bell-shaped shells for universal joints generally need to drill the small end face hole and tap the small end face hole, and because the product has a groove on the tooth part after the gear hobbing, the purpose of the groove is to install the product. After the car, it plays the role of connecting and fixing with it, and the purpose of drilling and tapping on the small end face is also to play a role of connecting and fixing after loading the car. Therefore, the role of the tooth groove and the drilling and tapping are repeated. As a result, the process route becomes longer and the process cost is increased. On the other hand, the processing time is greatly increased, thereby reducing the processing efficiency; in addition, the existing bell-shaped housings for universal joints are basically fine-turned, so that the existing The accuracy of the spherical raceway of the bell-shaped shell for universal joints is relatively low, so its running accuracy is poor, which affects its service life and use effect. At the same time, the material has no self-lubricating properties, and it is easy to heat up and soften quickly under poor lubrication conditions. , Wear failure, so it is necessary to improve the hardness, strength, lubricity and wear resistance of the material

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