Cnc Nylon Parts Machining Tips

Nylon material in precision machining is also a commonly used materials, often used to process small precision fixtures, due to the hardness, toughness and processing characteristics of nylon material, in precision parts processing has played an irreplaceable role, when Lee and the company processed a lot of precision fixtures made of this material, encountered in the thin-walled nylon processing parts, there will be easy to deform the situation, the precision is more difficult to control. Today we will talk about cnc nylon parts processing skills.

First of all, nylon machining less than 30mm small holes, due to the small holes in the space is narrow, heat dissipation difficulties, the operation of the lathe needs to reduce the lathe speed to 300 rpm or less, with the cutting fluid to be cooled; slow, even speed into the drilling, chip removal in a timely manner; through the hole, to the bottom of the hole, the drilling bit is going to penetrate the need to be more careful, reduce the speed of the drilling, cutting fluid or coolant, it is necessary to uniformly sprayed to the hole position.

Secondly, nylon machining processing greater than 30mm punched holes, first of all, to sharpen the drill bit, easy to process, reduce the scrap rate; will reduce the lathe speed to 180 rpm or less, greater than 55mm holes, you can reduce the lathe speed to 60 rpm or so; slow, even speed into the drilling, timely chip removal, spraying sufficient cutting fluid; drilling out of the holes, be careful, reduce the speed of the drilling.

Then, nylon machining for small hole reaming processing, the lathe speed should be lower than 60 rpm; uniform speed, low speed into the drill, the operator must hold the tailstock handle, to prevent the drill from being quickly brought into the hole by the lathe, resulting in the collapse of the product; cutting fluid spray evenly.

In nylon thin-walled precision machining parts, should be taken vigorously clamping the initial machining lightly clamping finishing processing sequence to ensure that the clamping force does not affect the precision parts size processing accuracy. Nylon materials and metal materials are different in nature, with low density, easy to deform and easy to process the characteristics. Then in the clamping process will be more likely due to the clamping and deformation of precision parts after the completion of processing elastic recovery so that its size and shape changes, the greater the isthmus holding force, the greater the deformation after the completion of processing. Usually in the workpiece clamping, clamping force will make the workpiece deformation, unloading the workpiece elastic deformation automatically recovered, resulting in the workpiece free of force under the conditions of size and processing size is not the same. If the clamping force is too large, a long time after the clamping of precision mechanical parts will produce plastic deformation, after processing the clamped part of the parts of the machining size does not match. Conversely, it will lead to the clamping is not tight, precision parts processing vibration, affecting the quality of precision parts processing dimensions.

Nylon parts processing, should avoid the tool itself to bring too much squeeze pressure, the tool cutting process in the continuous movement to the inside of the material, in addition to the tool on the side of the material cutting there is a direct pressure to advance, if the propulsion pressure is too large, not only will affect the clamping stability of the precision mechanical parts, will also directly cause deformation of the precision parts, resulting in workpiece

Elastic deformation recovery after the size deviation is too large. Stiffness of the stronger tool relative to the stiffness of the weaker tool's own poor elasticity is more likely to produce propulsive force on the processed workpiece, resulting in the deformation of the workpiece so, the use of relatively weak stiffness of the alloy machining accuracy is better.

Finally, nylon round machining, processing tool selection of white steel tools, should not choose alloy tools, tools should be kept sharp; lathe speed of not less than 200 rpm; appropriate feed speed to improve machining accuracy and surface finish. The sharpness of the knife edge on the precision machining accuracy has a great impact, the sharper the edge of the tool, the smaller the cutting resistance, the smaller the propulsion of the material, the smaller the deformation of the workpiece, the smaller the rebound phenomenon the better able to ensure that the precision mechanical parts processed dimensional accuracy, so the use of alloy knives for processing of nylon materials, three knives better than the quadrangular knife.