Select the processing tool according to the processing of PEEK materials
of different brands. Generally, yw1 or yw2 general cemented carbide cutter can be selected, and diamond cutter is better. The hardness and rigidity of high speed steel (white steel knife) are too low and easy to wear. Use coolant during processing to reduce wear and heat conduction; Otherwise, in the machining process, the high temperature caused by the friction between the tool and the end face of the product will lead to the melting of the material. For processing thin-walled parts, due to its poor rigidity and weak strength, if directly clamped with the claw of the three jaw chuck, it is very easy to produce deformation, increase the shape error of the parts, and then the circumferentiality of the parts can not be guaranteed. Therefore, when processing thin-walled products, clamping methods such as open sleeve or spring collet should be adopted. The action direction of the tightening force can also be changed, and the radial clamping is changed to axial clamping, that is, some pressing plate tools are used for clamping. Reasonable selection of cutting parameters, the biggest influence of cutting parameters is the amount of knife, so the amount of knife and cutting speed should be reduced when cutting thin-wall sleeve. When machining peek materials, properly increasing the rake angle can make the turning tool sharp, smooth chip removal, reduce the friction between cutting and rake face, and reduce cutting force and cutting heat. Properly increasing the inclination angle of the cutting edge can increase the actual rake angle of the turning tool, reduce the arc of the cutting edge and improve the sharpness of the tool. Thus, the cutting force and cutting heat are reduced. According to the characteristics that the axial bearing capacity of the thin-walled sleeve is greater than the radial bearing capacity, appropriately increasing the main deflection angle can reduce the back force and reduce the workpiece deformation. Properly increasing the secondary deflection angle can reduce the friction between the secondary cutting edge and the workpiece and reduce the cutting heat. Properly reducing the arc radius of the tool tip can reduce the back force and reduce the deformation of the workpiece, but it can not be too small. Too small will affect the surface roughness of the workpiece and reduce the heat dissipation area of the tool tip.
During milling, the feed rate should be small and the coolant should be sufficient, otherwise the product surface will change color and turn yellow when the cutting heat is too large; Try to use sharp end milling cutter with large rake angle and good chip removal; During clamping, the deformation of the product after processing shall be fully considered, and the clamping force and workpiece clamping method shall be properly controlled.
Drilling processing(peek material)
It is not allowed to drill directly with a large drill bit. First, drill with a drill bit with a diameter of less than 10mm, then bore with a smaller boring cutter, and finally bore with a large boring cutter; During drilling, the drill bit shall be removed repeatedly for chip removal; To ensure that the cutting fluid is cooled sufficiently and timely, the heat can be quickly reduced, the drilling feed speed can be appropriately reduced, and the drill bit shall be polished in time when the drill bit is worn.Special attention shall be paid to thread processing materials during tapping. PEEK material is relatively wear-resistant and will wear quickly during tapping, so the thread size shall be checked frequently. After the tap is worn, the product is easy to deform or even crack due to the increase of extrusion force. When tapping, the tap must be coated with coolant or tapping oil, and the feed rate should be small. When tapping deep holes, try to tap in sections for many times.