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Application of Tool Coating in Shaft Machining

Author: langfeng Time: 2017-12-21

Application of Tool Coating in Shaft Machining
Steyr through the shaft for the bridge on the important transmission parts,transmitted to the role of the rear drive axle.The quality of a direct impact on vehicle quality is normal or not.Input spline original drawing structure for the rectangular spline, processing technology: rolling rectangular spline a - grinding cylindrical c - knurled key d - heat straight after the c - grinding rectangular spline a. In 2007, the company tried to change the str through the shaft spline involute spline, and a small batch of trial processing, processing technology as follows: hot pre-grinding cylindrical b - rolling involute spline a ---- Hot pre-grinding cylindrical c - knurled key d - hot straighten c - hot straighten b, spline connection to involute, eliminating the original rectangular spline grinding cracks, but the phenomenon Need to add an external grinding process before the hot c, but also because of the heat after the need to meet at the same time a, c at school straight precision, to the processing of great difficulties, and the production efficiency is affected to some extent.
To ensure the integrity of the bridge, it is necessary to ensure that the flange flange and through shaft spline assembly after the seal on the overall amount of beating, so the involute external spline bearing outer diameter beating is particularly important. According to the actual situation of our plant equipment, through the shaft hot rolling involute spline beating process to ensure that the capacity of 0.04. Due to the difficulty of heat treatment straightening, mass production, heat treatment after quenching straightening process assurance ability of 0.08, unable to meet the product drawing requirements of 0.06, often due to the flange and through-shaft spline assembly after the oil seal on the large amount of synthetic bounce caused The problem of oil spills.
According to the principle of metal cutting, in normal cutting, tool wear mainly include the following: flank wear; rake face wear, that is, crater wear; front and back face at the same time wear and tear.
Tool coating refers to a thin layer of hardmetal or high speed steel with good strength and toughness. It is a refractory metal or nonmetallic compound with good abrasion resistance. The coating acts as a chemical barrier and thermal barrier, reducing the gap between the tool and the workpiece The diffusion and chemical reaction, thus reducing the crater wear. Coated tools with high surface hardness, good wear resistance, chemical stability, heat and oxidation resistance, small friction coefficient and low thermal conductivity and other characteristics. The picture shows the Oerlikon Balzers coated tools and uncoated tool cutting status diagram.
Physical vapor deposition processes are performed under vacuum or under low pressure gas discharge conditions, ie, in low temperature plasma. The material source of the coating is a solid material which, after "evaporation or sputtering", produces a new solid material coating on the surface of the workpiece that behaves completely differently from the substrate. pvd coating materials mainly tin, ticn, crn, tialn, altin, alcrn, wc / c, dlc and diamond and other ingredients, different applications, the need to use different coating materials. The thickness of the coating is usually only a few microns, the hardness is 2 to 5 times that of steel. Oerlikon Balzers invented a coating technology that replaces titanium with chromium and in 2004 launched a single-layer alcrn coating called balinit alcorna. The high red hardness of the alcrn coating allows it to remain stable at very high heat loads. The high hardness and abrasion resistance of high speed cutting, dry coating, and coating make the hardenability of the cuttable material
Through the shaft product material 49crmo4, heat treatment technology requirements: induction hardened hardened layer depth 5 texture, hardness requirements 35 analysis can be applied to the coating cutter cutting heat through the shaft.
Selection of spline hob, by Oerlikon Balzers, process test. Process method: hot pre-mill c-cot knurled roller d - hot c after the school alignment - hot knurled b, the original knurling process transferred to heat after the processing.
In the original cutting parameters unchanged), the processing noise is significantly reduced. The quality of the processed products were tracked, will be random sampling of 10 spindles through the shaft spline and m value variation, the data can be seen from the record, the application of coated hot knifed cutter through the shaft machining accuracy in full compliance with the requirements of the drawings, the Accuracy requirements can be removed from deviation. The decrease of m value increases the variation of backlash with the flange assembly, which improves the assembly accuracy.

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