Finishing Forming Method and Finishing Punch of Three-Ballway Constant Velocity Universal Joint Cylindrical Shell

Abstract

The invention discloses a method for finishing a cylindrical shell of a three-ball-groove constant velocity universal joint. The method comprises the warm forging step and the cold-finishing plastic forming step, wherein the cold-finishing plastic forming step is a thinning and stretching cold-finishing process, a finishing male die is sleeved with a blank, the action that centripetal force is exerted by a cold-finishing female die on the blank to the finishing male die is adopted, the blank receives force under the action of the cold-finishing female die and plastically deforms, the blank is tightly attached to the finishing male die and flows in the movement direction of the female die, and therefore the inner wall of a shell body of the cylindrical shell is made to be a protruding arc face; three circular arc protruding blocks are evenly arranged on the outer wall of a cylinder of the finishing male die, a male die head is of an arc face structure, and the outer wall of the finishing male die is of a concave arc face structure in the length direction of the finishing male die. Grooves, produced through the finishing male die and the finishing method, of the cylindrical shell are free of drum-shaped errors, transmission of a transmission shaft is smooth, assembly is easy, the match accuracy is good, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of precision cold forging forming of inner cavities with unequal cross-sections, and in particular relates to a method for finishing and forming inner cavities with different cross-sections of a cylindrical shell of a three-ball constant velocity universal joint. Background technique [0002] The three-way constant velocity universal joint is one of the key components of the front drive system of the car. A typical three-ballway constant velocity joint consists of a cylindrical shell, a star sleeve, a cage and three steel balls. The cylindrical shell is a precision formed part, including a cylindrical shell shell 1 and a handle 2 provided at the lower end of the shell. The shell 1 is provided with an inner cavity, and the inner cavity is composed of a central circular cavity 3 and a central circular cavity. The cavity is composed of three ball channel cavity 4 evenly distributed outside the cavity. Its nota...

AI Technical Summary

Problems solved by technology

Although such a structure is assembled precisely, the gap between the cylinder mouth is small and the assembly is difficult

In addition, in normal loading and use, the position with the most frequent sliding friction is the middle section of the cylindrical shell. This area will quickly wear out, causing the three grooves of the cylindrical shell to show a drum-shaped error, and the fit gap appears to be small at both ends and large in the middle. characteristics, leading to early occurrence of abnormal sound and vibration of the transmission shaft

Images