Machining method of pedal shaft core

Abstract

The invention relates to a machining method of a pedal shaft core. The machining method of the pedal shaft core comprises the following steps of blanking and wire drawing, forming, tool withdrawal groove machining, thread rolling, heat treatment, vibration discharging, automatic material taking, annealing, cooling and blackening. In the step, due to the fact that thread rolling is carried out before heat treatment, it is quite convenient to machine, and meanwhile, heat treatment is carried out on the shaft core, so that the shaft core reaches the high hardness, a requirement that a pedal is large in strength and cannot be bent can be met, the head of the shaft core is annealed, the material hardness is greatly reduced; after spin riveting, the head of the shaft core is plastically deformed into a mushroom-shaped protrusion, and therefore the pedal frame is buckled, and the pedal is very safe to use; in the whole set of step, the longest machining time of a single shaft core is the annealing process, the time is 5 seconds per shaft core, and 5760 shaft cores can be produced per shift according to eight hours per shift, so that the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to a processing method for a pedal shaft core. Background technique [0002] Bicycle pedals are assembled on the left and right cranks of the bicycle. When the bicycle is riding, the pedal force is first transmitted to the pedals, and then the axle core of the pedals drives the crank to rotate, and the rear wheel is driven by the chainring and the chain flywheel. Turn, thus making the bike go forward. A general pedal is composed of a shaft core, a pedal frame, and a shaft sleeve. There are two shaft sleeves, which are respectively tightly embedded on both sides of the inner hole of the pedal frame. The shaft core passes through the inner hole of the pedal frame, and then the head of the shaft core is protruded to buckle the pedal frame by the riveting process, or some nuts are used to lock the pedal frame to prevent Pedal frame comes out of axle. [0003] In the actual application process, although the production cost of the ax...

AI Technical Summary

Problems solved by technology

[0003] In the actual application process, although the production cost of the axle core using the spin riveting process is low, due to the lack of hardness of the axle core using the spin riveting process (high hardness cannot be riveted), when the pedal force is large, the axle core will be broken. The pedal is bent and deformed, so it can only be applied to children's bicycles with light loads. Although the pedals with nut locking technology can achieve higher hardness through heat treatment, due to the high hardness, tapping is more inconvenient and increases Due to the high hardness, the head of the shaft core cannot be plastically deformed into a mushroom-shaped protrusion during subsequent use. During driving, due to vibration and other reasons, the lock nut will loosen, causing the pedal to come out