Numerical control milling method for micro threaded holes of titanium alloy

Abstract

The invention relates to a numerical control milling method for micro threaded holes of titanium alloy. The method comprises the specific machining operation steps of replacing a traditional manual tapping method for the titanium alloy with numerical control machining to improve the quality and efficiency of threads, selecting a threaded tool made of hard alloy to ensure high efficiency and batch production of part machining, and selecting a reasonable technical machining method to ensure specification consistency of the threads, circumferential stress uniformity during threaded milling and prevent the tool from being broken. The numerical control milling method is suitable for the micro threaded holes, with the machining range smaller than M3 and the length-diameter ratio higher than 2.5, of the titanium alloy, and the bottleneck problem of tapping of the micro threaded holes, with the large-length-diameter ratio, of the titanium alloy is solved successfully. Meanwhile, drilling and tapping are completed jointly, efficiency is improved by 6-8 times, the grade of precision of the threads of the holes and specification consistency of the threaded holes are improved, and the machining requirement for high precision of titanium alloy parts can be met.

Description

technical field [0001] The invention relates to the technical field of precision machining of titanium alloys, in particular to a numerical control milling method for fine threaded holes of titanium alloys. Background technique [0002] Titanium alloy has the advantages of high strength, low density, good toughness and corrosion resistance, and is widely used in aviation, aerospace and medical industries. However, titanium alloys also have their own defects, such as poor process performance and difficult cutting. [0003] The current research on the conventional cutting performance of titanium alloys is very mature, and the types of corresponding turning and milling tools are also very complete. It is the bottleneck problem of the industry, and well-known tool manufacturers at home and abroad have no corresponding successful cases for reference. [0004] The main reason for this bottleneck problem is: the strength of the tap for processing small threaded holes is low, and ...

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Problems solved by technology

[0004] The main reason for this bottleneck problem is: the strength of the tap for processing small threaded holes is low, and the deformation coefficient of titanium alloy is small, the cutting temperature is high, and the cutting force per unit area is large, which causes the tap to wear quickly when the high-speed steel tap is selected. , needs to be replaced frequently, but when using cemented carbide taps, the taps are easy to chip and break, and the broken blades are not easy to take out, which seriously causes parts to be scrapped, and there is also the problem of chip removal clogging in the machining hole

[0005] Manual tapping has always been the first choice for machining small threaded holes with large length-to-diameter ratio, but the efficiency of manual tapping is extremely low, and the industry urgently needs to solve the problem of CNC tapping

However, there are problems such as tool selection and process control in CNC machining.

Moreover, most of the existing titanium alloy tapping patents are limited to improving the sharpening angle of the tap, which is not suitable for batch CNC machining

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