Low-damage turning method for ceramic matrix composite fine internal threads
A composite material and internal thread technology, applied in stone processing tools, stone processing equipment, work accessories, etc., can solve the problems of high-end aerospace equipment service performance safety hazards, inability to repair multi-scale processing damage, etc., to meet surface integrity Requirements, excellent matching, and the effect of improving tooth shape retention rate
Active Publication Date: 2021-02-12
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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Problems solved by technology
Although composite materials have excellent thermophysical properties, their unique characteristics such as heterogeneity and anisotropy make it easy to produce irreparable multi-scale processing damage in the process of drilling and threading. The high reliability and long life service performance bring safety hazards
At present, there is no suitable thread processing method that can reduce material damage, improve the surface quality of the thread, and thus increase the service life of the thread
Method used
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Embodiment
[0039] The processing object is ceramic matrix composite material M10×1.5-6H internal thread product.
[0040] (1) Design and prepare a polycrystalline diamond (PCD) tool for machining micro-internal threads of ceramic matrix composites. Among them, the turning tool head is made of PCD material, and the tool body is made of K10 hard alloy material, which is firm and reliable through welding. The total length of the internal thread turning tool is 90 mm, the diameter of the tool body is 10 mm, and the length of the tool body is 72 mm; the distance from the tool tip to the tool axis is 4 mm, and the radius R of the tool tip is 0.11 mm.
[0041](2) Using the polycrystalline diamond (PCD) tool for machining fine internal threads of ceramic matrix composites, the threads are roughly machined according to the internal thread turning process. The cutting amount is: the linear interpolation internal tolerance and external tolerance are both 0.03mm, and the feed rate is The pitch of t...
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The invention relates to a low-damage turning method for ceramic matrix composite fine internal threads, and belongs to the field of composite machining. The low-damage turning method comprises the following steps that firstly, a polycrystalline diamond tool used for turning the ceramic matrix composite fine internal threads is manufactured; secondly, rough machining is conducted on the fine internal threads through the polycrystalline diamond tool by means of a variable-rotating-speed and variable-cutting-depth tool path; and thirdly, the fine internal threads are finely machined through thepolycrystalline diamond tool, and forming is conducted. By means of low-damage turning tool design and turning machining process parameter optimization, the thread form retention rate, the product percent of pass and the machining efficiency of the ceramic matrix composite fine internal threads are remarkably increased, and the urgent machining requirements for high precision, low damage and highefficiency of threaded connecting piece products are better met.
Description
technical field [0001] The invention belongs to the field of mechanical processing of composite materials, and relates to a low-damage turning method for fine internal threads of ceramic matrix composite materials. Background technique [0002] In recent years, ceramic matrix composites threaded structural parts have been widely used and developed in engineering. In order to connect and fix various structures, it is often necessary to adopt a large number of screw connections on the material structure. In the application of large structures, the connection technology of composite materials, especially the screw fastening technology of composite materials, has become one of the key technologies for manufacturing large components with high reliability. Compared with metal fasteners, composite threaded fasteners can maintain better rigidity and strength in high-temperature oxidizing environments, and can better match composite structural parts of the same material. With the m...
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IPC IPC(8): B28D1/16B28D7/00
CPCB28D1/16B28D7/005
Inventor 徐亮刘宏瑞王新永王凯李军平王金明王松陈旭辉宋楠韩军严伟容
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH