In the rapid development of modern industry, precision machining, as a core technology, is gradually becoming an important force driving the progress of various industries. With the continuous advancement of technology, new processing techniques emerge in an endless stream, especially showing strong application potential in fields such as aerospace, optics, and medical care. These emerging technologies not only improve processing accuracy and efficiency but also provide strong support for the innovative development of various industries.

In this process, the selection of processing materials is of crucial importance. The physical and chemical properties of different materials determine the processing difficulty and processing effect. Therefore, understanding the requirements of precision machining for materials and the precautions when processing different materials is particularly important for ensuring product quality and processing efficiency.

I. Basic Requirements of Precision Machining for Materials

• Mechanical Properties of Materials

Materials used in precision machining need to have good mechanical properties, including strength, hardness, toughness, and wear resistance. The strength of the material affects its risk of deformation and breakage during processing, while the hardness is directly related to the wear of the cutting tool. Generally, materials with higher hardness require the use of harder cutting tools to prevent the tool from wearing out too quickly.

• Workability of Materials

The workability of different materials varies greatly. Some materials, such as aluminum alloys and brass, are easy to process, while stainless steel and titanium alloys are more difficult to process. Workability is not only affected by the inherent properties of the material but also by factors such as the heat treatment state and surface state of the material. Therefore, when selecting materials, their workability should be fully considered to improve processing efficiency.

• Stability of Materials

Precision machining requires materials to maintain good stability during processing to avoid deformation caused by temperature or processing stress. Indicators such as the coefficient of thermal expansion and tensile strength of the material need to be considered to ensure that during the processing, the geometric shape and dimensions of the parts can be maintained within the design requirements.

II. Precautions when Processing Different Materials

• Processing of Metal Materials

Aluminum Alloy: When processing aluminum alloy, attention should be paid to the cutting speed and feed rate of the cutting tool. Usually, a higher cutting speed is adopted to obtain a smooth surface and reduce the wear of the cutting tool. At the same time, excessive cutting depth should be avoided to prevent the cutting tool from chipping.

Stainless Steel: When processing stainless steel, the selection of the cutting tool is of vital importance. Cutting tool materials with strong wear resistance and good heat resistance should be selected, and an appropriate coolant should be used to reduce the cutting temperature and prevent the material from deforming due to overheating.

Titanium Alloy: Titanium alloy is favored because of its high strength and low density, but it is difficult to process. During processing, a low cutting speed and small feed rate should be used, and the cutting temperature should be strictly controlled to avoid hardening and tool wear.

• Processing of Non - metal Materials

Plastic: When processing plastic, attention should be paid to temperature control. Excessive cutting temperature can cause the material to deform or melt. Appropriate cutting speed and feed rate can effectively reduce heat generation and thus improve processing quality.

Ceramics: Ceramic materials have extremely high hardness. When processing, diamond cutting tools should be selected, and a lower cutting speed should be adopted to reduce tool wear and the risk of material cracking.

• Processing of Composite Materials

Composite materials are usually composed of materials with different properties, and their processing is more difficult. During processing, appropriate cutting tools should be selected according to the characteristics of different components, and cutting parameters should be reasonably controlled to avoid material delamination or cracking. In addition, the use of coolant is also very important to reduce the temperature during processing and ensure the stability of the material.

Precision machining has clear requirements for the selection of materials, and the precautions when processing different materials are also different. Before material selection and processing, processors need to fully understand the properties of the materials and reasonably adjust the processing parameters to achieve a better processing effect. With the continuous advancement of technology, the emergence of new processing techniques and materials will further promote the development of precision machining and provide higher - quality products for various industries.