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Multi-material composite dental disc

88 views Published by admin Jun 17,2019

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The 28th Shanghai international bicycle exhibition officially ended on the 5th of last month there are lots of factories from China attend the cycle show. It is bicycle and e-bike whole accessories show,One of The deepest impression is tooth disc crank assembly and CNC integrated flywheel part.

There are a few key indicators for the bicycle teeth: high strength, high toughness, high wear resistance, lightweight.However, there is a contradiction between high strength and lightweight.Often will lead to the strength up, weight will also go up, that is, we often say pile material.In order to solve this contradiction, shi lu in the structure of the tooth disc for the division of labor.At present, most of the ultra-light tooth disc, are using 7075 aluminum alloy to process, but in any case, aluminum alloy is still aluminum alloy, strength or limited.

In the past, there were three main problems in the aluminum alloy disc tooth part:

First, aluminum alloy teeth in the use of deformation.


Second, the aluminum alloy teeth compression ability is poor.


Third, poor wear resistance.


In the center of the tooth and the combination of the surrounding disk teeth, because the force of both are mainly tangential.On the connection of the two, the aluminum alloy body at the center and the surrounding disc teeth are designed with a trapezoidal opening at the joint.


The tooth part of the disc, due to the alloy steel material and surface coating treatment, the hardness is far beyond 150HB of 7075 T6 treated aluminum alloy, can reach a higher 570HB, and due to the different thickness of the coating, the more the core position of the hardness will gradually decline, but it is still much higher than 7075 aluminum alloy.And the tensile strength of the aluminum alloy core in the center also reached more than 700 mpa, compared with the strength of the aluminum alloy treated by 7075 T6 is only about 450 mpa.

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