In the field of CNC (computer numerical control) processing, the fixture is a key component connecting the workpiece and the machine tool, and its durability directly affects the processing accuracy, efficiency and product quality. Therefore, choosing the right fixture material is an important means to improve the durability of the fixture. From the perspective of material selection, this paper discusses how to enhance the durability of CNC machining fixtures through scientific material selection. -

Understand the functions and requirements of fixtures

Resistance to common fixture materials and characteristics

-- 01, metal materials --

The cast iron fixture has high rigidity and good vibration resistance, which is suitable for the clamping of large and heavy workpieces. However, the processing of cast iron fixtures is difficult and the cost is relatively high.

Steel fixtures have high strength and hardness, and are easy to process and heat treatment. Different types of steel (such as carbon steel, alloy steel, etc.) have different mechanical properties and can be selected according to specific needs.

Aluminum fixture light weight, high strength, suitable for the need to reduce the weight of the scene. However, the wear resistance of aluminum alloy is relatively poor, and it needs regular maintenance and replacement.

-- 02, non-metallic materials --

Principle of material selection

Other measures to improve fixture durability

Reasonable fixture design can significantly improve its durability. For example, by increasing the support area of the fixture, optimizing the clamping method, reducing the stress concentration point and other measures, the strength and stiffness of the fixture can be enhanced.

The quality of the accessories in the fixture (such as screws, nuts, springs, etc.) also directly affects the durability of the fixture. The selection of high-quality accessories can ensure that the fixture is not easy to loosen and damage during use.

Regular maintenance and maintenance of the fixture can extend its service life. For example, cleaning the cutting residue on the fixture surface, inspecting and replacing badly worn parts, etc.