PEEK (polyether ether ketone) is an aromatic crystalline thermoplastic special polymer material with excellent physical and chemical properties such as high mechanical strength, high temperature resistance, impact resistance, corrosion resistance, hydrolysis resistance, and wear resistance. PEEK is widely used in aviation industry, machinery industry, electronic and electrical fields due to its excellent comprehensive performance.
Large Size, Thin Wall PEEK Long Bushing
In practical applications, the most common product forms of PEEK are sealing rings, insulating rings, shaft sleeves, etc. However, the large-size, thin-walled, and high-length PEEK shaft sleeves are prone to problems such as clamping deformation and knife vibration during processing, making their processing difficult.
Solution to clamping deformation problem
1. When machining PEEK pipes, if the size requirements are very high, try to grind the outer circle of the PEEK pipes on both sides to ensure that the roundness of the PEEK pipes can be well maintained no matter what clamping method is used.
2. For the clamping method of PEEK pipe processing, try to use manual three-jaw chuck and spring collet for clamping, and try to avoid using pneumatic-hydraulic three-jaw chuck. Control is easy to cause loss of roundness to the pipe, and the size is not guaranteed).
The spring collet can wrap the PEEK tube as a whole (it is better to use the PEEK tube that has been ground through the outer circle), and there are more stress points, which is conducive to maintaining the stability of the processing size. The clamping force of the manual chuck can be controlled manually, which is also conducive to the control of the size.
Vibration knife problem solution
Taking the actual processing example as a reference, the shaft sleeve with an outer diameter of 137mm and an inner hole of 127mm and a length of 342mm. The inner hole knife uses a Φ60*400mm anti-vibration tool holder made of special steel. The excellent material properties can effectively control the vibration of the tool holder and better control the tolerance and smoothness of the inner hole of the product.
Use the center bracket to support the front end of the outer circle of the product. The adjustment and support strength of the center clamp must be moderate, otherwise it will affect the roundness of the inner hole of the processed product or the displacement of the workpiece. The cover is supported at the step of the inner hole at the rear end to prevent the three claws from affecting the roundness of the product. The machining of the outer circle will be completed after the watch is made with a metal mandrel.
ARKPEEK CNC workshop has nearly 15 kinds of processing equipment such as CNC lathe, manual instrument car, drilling machine, centerless grinder, double-sided grinding, single-sided grinding, etc. In order to improve processing efficiency, various parts are automatically clamped by automatic equipment to achieve 24-hour uninterrupted production and ensure high-quality and high-efficiency production of product parts.
We research and improve existing equipment and processes all the time, introduce international advanced technology, and carry out innovative improvements to meet the market's requirements for functionality, reliability and safety. At present, we have completed the application research and development of more than 20,000 kinds of PEEK parts and production.