What should be paid attention to in PEEK machining?
PEEK has the characteristics of high temperature resistance, high wear resistance, high tensile strength, and good flame retardancy. It also has the heat resistance and chemical stability of thermosetting plastics and the molding processability of thermoplastics. The long-term use temperature of PEEK is about 260-280°C, the short-term use temperature can reach 330°C, and the high pressure resistance can reach 30MPa. It is a good material for high-temperature sealing rings. PEEK products are suitable for use in a variety of harsh working conditions. PEEK also has excellent properties such as good self-lubricity, easy processing, stable insulation, and hydrolysis resistance, making it widely used in aerospace, automobile manufacturing, electronic and electrical, medical and food processing fields. Because of the unique performance advantages of PEEK materials, PEEK products can be widely used in many fields such as petrochemical, electronic and electrical, instrumentation, machinery and automobiles, medical and health, aerospace, military nuclear energy and so on.
The molding process of PEEK material includes injection molding, extrusion molding, blow molding, pressing, and mechanical processing. Among them, mechanical processing is quite different from metal materials and general engineering plastics in terms of thermal expansion, heat dissipation performance, elasticity, and wear resistance. If sufficient attention is not drawn, improper operation will cause explosions and even damage processing equipment. .
Causes of material bursting during processing: ①As the stress of the blank itself is not completely eliminated, bursting occurs during processing. ②Blasting occurs when using too large a knife to eat during processing. ③Use a larger drill to drill directly, it is easy to squeeze and burst due to the large cutting force. ④During deep hole processing, the drill bit was not repeatedly retracted to remove chips, and the chips were not fully discharged, causing cracking due to extrusion. ⑤ Insufficient cooling. When the drilling is insufficiently cooled, the cutting heat and cutting force generated are too high, and it will also burst. ⑥If the feed speed is too fast, it will increase the internal stress of the PEEK bar and cause bursting. ⑦Because the PEEK material is wear-resistant, the cutting edge of the drill bit wears out quickly when drilling. At this time, if the drill bit is not sharpened in time, the hard drilling will also cause explosion. Analyzing the reasons for the explosion can be divided into two aspects: material and processing: first, if the rough machining amount of the part is large, the heat generated will inevitably lead to the release of internal stress, which will lead to the deformation of the part. Especially the parts with high size requirements should be annealed once after rough machining, and then finished to the size requirements. The main function of heat treatment annealing is to improve the crystallinity of the part, thereby improving its strength and chemical resistance, reducing the internal stress generated during extrusion and machining, and improving the dimensional stability in a wider temperature range.
gz ideal has many years of experience in the production and processing of PEEK products. It can perform extrusion molding, injection molding, compression molding, and machining molding. It can develop and manufacture injection molding and compression molds according to customer drawings and sample requirements, and customize various specifications , PEEK parts and finished products with a wide range of uses. The company has long-term experience in PEEK production and processing, and can now produce various specifications of PEEK products.