Our services start from providing comprehensive technical consultation to customers. Our technicians will choose the best materials and production technologies by comprehensively considering all requests for customers. According to the specific needs, we customize ideal semi-finished products, and make sure accurate dimensional accuracy.
The introduction of material machining processing
Generalization
Unreinforced thermoplastic plastics can use high speed steel for the processing: for enhanced plastic, it needs to use hard alloy steel.
In all of the machining processes, cutting head has to keep a certain of sharpness.
As the poor thermal conductivity of the plastic, you must ensure heat loss. The Best way of cooling depends on the cutting head.
Dimensional stability
The prerequisite to get high precision is use the semi-finished products with stress processing. The heat generated in the machining process will inevitably result in internal stress release, which brings about parts deformation. If machining parts are larger, they will be made a annealing treatment after the rough processing to eliminate the stress generated in machining process.
For the material with higher water absorption(e.g. nylon), dehumidification has to be done before the processing.
Plastic The plastic dimensional tolerance is bigger than the metal, meanwhile, it is worth considering the plastic coefficient of thermal expansion is much larger than the metal.
Machining method
1.Vehicle Processing
Cutting head should be designed into wide shape if part surface require is specially high.
And when processing thin walls and soft materials, it's best to use structure of cutting head like a knife.
2.Milling
If it is a milling flat, facing cut will be more economic than circumferential milling. For peripheral mining cutter and formed milling cutter, it should not have more than two smear metal blades, so that deviation amplitude that caused by the blade vibration can be reduced to the minimum, it also can make sure that there is enough gap among tools.
3.Drilling
Use twist drill： the scope of the spiral angle is between12 ° and 16 °, it is ease to chip removal, spiral groove should feel smooth.
Drill step by step or use hollow drill or cut directly when the hole with large diameter is processed. When drill to the solid materials, paying particular attention to use sharp drill bit, or increasing pressure during drilling process could split the parts.
As compared to unreinforced materials, enhanced plastics have greater internal stresses in the machining process, impact strength is lower, thus it is more likely to be split. Therefore, if possible, heating section bars into about 120℃ (heating time of every 10 mm thick of parts is an hour) before drilling enhanced materials. We recommend that heating can be done when process nylon and polyester.
4.Sawing
Usually using thinner saw blades to cut through thick components in sawing process, You should try to avoid the heat through friction, it's better to use the saw blades with sharp and big sawtooth.
5.Tapping
It’s better to use screwer to process the thread, using bidentate flower cutter can also avoid the flash.
We recommend that you do not use the threading die when tapping, because threading die will cut once more at the time of returning back to the knife.
Working allowance should be considered when tapping(working allowance depends on different materials and pore sizes, and the reference value is 0.1 mm).
6.Safety specification
If you don't follow the processing guide, plastic degradation will be caused by overheating of local material. Like PTFE, this kind of material should use air discharge equipment to exhaust them away after the degradation.
No smoking is allowed in workshops to prevent poisoning.
Whether our application engineers’ written or oral suggestions is just to make you work better without assuming any responsibilities, also to the protection the third party.
We will not be held responsible for any damage in machining process.
