Method for machining Teflon thin-wall spiral part

Abstract

The invention discloses a method for machining a Teflon thin-wall spiral part. The method comprises the following steps: (1) preparing materials and selecting a clamping way; (2) performing cylindrical turning on the part after clamping is completed, wherein a cylindrical turning cutter adopts an MVLNR202K-16 cylindrical profiling cutter bar and a 35-degree VNGP160402 cutter blade; the machining parameters are as follows: the rotating speed is 1000r / min to 2000r / min; the depth of cut ap is 0.1mm to 0.5mm; the feed rate f is 0.1mm / r to 0.3mm / r; (3) lathing a spiral groove in the part, wherein the front rake angle of a spiral groove lathing cutter is 10 to 15 degrees; the spiral groove lathing cutter is provided with an auxiliary angle of 10 to 12 degrees; the machining parameters are as follows: the depth ap of cut of spiral lathing is 0.2mm; the rotating speed of a main shaft is 500r / min; the screw pitch is 1.33mm; (4) machining the inner diameter of the part in a manner that lathing is performed firstly and boring is performed subsequently. In the method for machining the Teflon thin-wall spiral part provided by the invention, good machining effect is achieved by effectively clamping a positioning workpiece, adopting a correct cutting method, rationally choosing cutting tools and reducing residual cutting heat and dimensional change on the surface of the workpiece.

Description

technical field [0001] The invention belongs to mechanical processing techniques, in particular to a processing method for thin-walled spiral parts of polymer materials. Background technique [0002] PTFE has the characteristics of high temperature resistance, corrosion resistance, acid and alkali resistance, various organic solvent resistance, low water absorption, low friction coefficient, good self-lubricating friction performance, etc. It can almost resist the corrosion of all chemicals. Tetrafluoroethylene has sealing properties, high lubricity and non-stickiness, electrical insulation and good anti-aging ability, excellent temperature resistance and can work for a long time at a temperature of -180 ° C ~ + 250 ° C. This kind of material is widely used in chemical industry and aviation. aerospace products. [0003] A certain type of part of the company (such as figure 1 ) is made of glass fiber filled polytetrafluoroethylene, the shape of the part is spiral, the thick...

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Problems solved by technology

[0004] The following problems existed in the previous processing process: ①Due to the poor heat dissipation of the part itself and the high thermal expansion coefficient, the part was heated and deformed during the processing; ②After the part was processed, the surface quality was poor, and the dimensions of the inner hole and outer circle could not be measured. Dimensions are unstable; ③When machining the beveled edge of the part, the part cannot be loaded into the fixture; ④The processing method and dimensional tolerance have been adjusted many times, but the part requirements are still not guaranteed, and the pass rate of the part size is only 30%

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