Tension end machining method for car parking and braking cables

Abstract

The invention discloses a tension end machining method for car parking and braking cables. The method includes the specific steps: 1) peeling one end of one cable; 2) treating the front end of the peeled cable with a punching process to enable the front end of the cable to form a wire rope expansion structure; 3) utilizing high-pressure hot air to blow away plastic fillers in the wire rope expansion structure; 4) subjecting the wire rope expansion structure to treatment of a die casting process to form a die-casting head serving as the tension end of the cable. The method has the advantages that after the plastic fillers in the wire rope expansion structure are blown away with the high-pressure hot air, the die-casting head is formed by means of treatment of the die-casting process; due to the fact that the plastic fillers are removed, air holes cannot be left inside the die-casting head, metal materials on die castings are distributed more uniformly and densely, pulling-out force of the die-casting head is increased effectively and can be increased to about 9000N, and fatigue test can reach 100,000-120,000 times under the same conditions.

Description

technical field [0001] The invention relates to the field of processing an automobile parking brake cable, in particular to a processing method for a tension end of an automobile parking brake zipper. Background technique [0002] The car parking brake cable is an important part of the parking brake system. The tension end of the parking brake cable is connected to the gear-shifting mechanism of the car, and the tension end needs to bear high tension. The structure of the cable consists of a sheath and a multitude of steel wires inside the sheath, with the spaces between the wires filled with plastic. The traditional method of processing the tension end of the cable is to first peel one end of the cable, and then perform a flowering process on the end of the cable, so that the steel wire rope at the end of the cable is bent to present an expanded structure, and then the end of the cable is The end of the cable is put into a closed mold for zinc die-casting processing, and f...

AI Technical Summary

Problems solved by technology

The pull end of the cable in this structure has the following problems: when the end of the cable in the expansion structure is die-casting, the plastic in the expansion structure will be vaporized by pouring zinc fluid, and the gasified plastic cannot escape from the closed enclosure. The die-casting cavity will eventually leave many air bubbles and plastic debris inside the zinc die-casting head, which will reduce the uniform density of the zinc die-casting head, thereby reducing the pull-off force of the die-casting head. Usually, the steel wire rope 1X19 outer diameter is 3.3 mm in thickness. The tension end of the cable is about 7000N, and the fatigue test is 30,000 to 50,000 times. When the car is parked and braked, it may cause the tension end of the cable to crack or break.

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