The following are the general steps for the processing of the road bicycle bend arm and dental disc:

First, bending arm processing

1. Design and planning

- According to the design requirements and performance indicators of road bicycles, determine the shape, size, material and other parameters of the bend arm. Usually, the curved arm is made of high-strength and lightweight materials such as aluminum alloy or carbon fiber. The use of CAD and other software for accurate three-dimensional design, taking into account the connection with the frame, the coordination with the foot and the rationality of the transfer of force and other factors.

2. Material preparation

- Aluminum alloy arm:

- For aluminum alloy materials, choose the right grade, such as 6061, 7075, etc., these grades have good strength and processing properties. The aluminum alloy raw materials are cut into rough rough shape, generally using sawing and other ways to ensure that the size is slightly larger than the final required size for subsequent processing.

- Carbon fiber arm:

Carbon fiber materials are usually prepared in the form of prepregs. Prepreg is the impregnation of carbon fiber in resin to form a workable material. The prepreg is cut to the appropriate shape and size according to the design requirements, ready for the subsequent lay-up and curing process.

3. Processing and forming

- Aluminum alloy arm:

- First rough machining, using CNC milling machines and other equipment according to the design shape and size of the milling process, remove excess material, form the basic outline of the arm. In the machining process, we should pay attention to the selection of tools and the setting of cutting parameters to ensure the machining accuracy and surface quality.

- Then finish, including grinding, polishing and other treatments on the surface of the curved arm to make its surface smooth, reduce wind resistance and improve appearance quality. At the same time, the connecting holes, thread holes and other parts are precisely machined to ensure the assembly accuracy of other parts.

- Carbon fiber arm:

- The layup process is carried out, and the cut carbon fiber prepreg is placed in the mold successively according to the designed Angle and the number of layers. The Angle and sequence of layering will affect the strength and stiffness of the arm, and the mechanical properties of the arm are generally enhanced by multi-layer cross-layering.

- Place the prepreg lined mold in a hot press or oven for curing. During the curing process, parameters such as temperature, pressure and time should be strictly controlled to ensure that the resin is fully cured and the carbon fiber bend arm is well formed. After curing, the curved arm also needs some post-treatment, such as removing excess flash edges and grinding the surface to improve its appearance quality and dimensional accuracy.

4. Quality inspection

- Quality inspection of the processed curved arm, including dimensional accuracy measurement, using measuring tools such as calipers, micrometers, etc. to measure the length, width, thickness and other dimensions of the curved arm, to ensure that it meets the design requirements, and the size deviation is controlled within the specified range (such as ±0.1mm).

- Conduct mechanical property tests, such as tensile tests, fatigue tests, etc. to test the strength and stiffness of the arm to ensure that it can withstand various forces and stresses during riding. For the aluminum alloy bend arm, it is necessary to check whether there are cracks, pores and other defects on the surface; For the carbon fiber bend arm, it is necessary to check whether there are problems such as stratification and uneven resin.

Second, dental disk processing

1. Design and planning

- Determine the number of teeth, modulus, disc thickness, aperture and other parameters of the dental disc. According to the requirements of the bicycle transmission system and the needs of riders, the dental disc combination with different teeth number is designed. For example, the common road bicycle dental disc has a combination of 52T (large dental disc) and 36T (small dental disc). The same use of CAD and other software for accurate design, taking into account the connection with the crank, chain coordination and power transmission efficiency and other factors.

2. Material preparation

- Generally, the dental disc will be made of aluminum alloy or steel materials. For aluminum alloy dental disk, choose the appropriate aluminum alloy grade, such as 7075 aluminum alloy, etc., cut its raw materials into the blank shape of the disk, can be cast or forged and other methods to obtain the blank, and then subsequent processing. For the steel tray, 45 steel is commonly used, and the blank is obtained by cutting the steel raw materials.

3. Processing and forming

- Aluminum alloy disk:

- First of all, rough machining of the disc, milling of the blank using CNC machining center and other equipment, removing most of the excess material, processing the basic shape and tooth profile of the disc. When processing the tooth shape, it is necessary to process in strict accordance with the designed module and the number of teeth to ensure a good fit between the teeth and the chain.

- Then finishing, further trimming and grinding of the tooth shape to make its surface smooth, improve the meshing accuracy with the chain and transmission efficiency. At the same time, the center hole and mounting hole of the tooth disk are precisely machined to ensure the assembly accuracy of the parts such as the bend arm. The surface of the disc is treated with anodic oxidation to improve its corrosion resistance and appearance quality.

- Steel disk:

- For the steel die disk blank, the initial mechanical processing after forging or casting is carried out first, the impurities such as the oxide on the surface are removed, and it is processed to close to the final size. Then heat treatment, such as quenching, tempering and other processes, to improve the hardness and strength of the steel and other mechanical properties.

- The tooth profile and other parts are then finished in a manner similar to that of the aluminum alloy dental disc. It is also necessary to ensure the accuracy and surface quality of the tooth shape, as well as the assembly accuracy of other components. Finally, surface treatment such as chrome plating can be carried out to increase its wear resistance and rust prevention performance.

4. Quality inspection

- Carry out dimensional accuracy test on the tooth disk, measure the outer diameter, aperture, tooth thickness and other dimensions of the tooth disk to ensure that it meets the design requirements and the size deviation is controlled within a small range (for example, the tooth thickness deviation is controlled within ±0.05mm).

- Carry out profile accuracy detection, use special profile measuring instrument to detect profile profile, pressure Angle and other parameters to ensure that the profile meets the standard and can mesh well with the chain. It is also necessary to carry out action balance test to ensure that the disk will not produce excessive vibration when rotating at high speed. Check the surface quality of the dental disc to see if there are cracks, sand holes and other defects.

The above are the basic steps of road bicycle bending arm and tooth plate processing, the actual processing process may vary depending on the production process and equipment, and requires strict quality control to ensure the performance and quality of the product.