Milling processing process for LD5-CS free forging angle-closure deep cavity structural parts

Abstract

The invention relates to a milling processing process for LD5-CS free forging angle-closure deep cavity structural parts, belongs to the field of aviation precision manufacturing processing, in particular to the milling processing process for LD5-CS free forging angle-closure deep cavity structural parts. The milling processing process for LD5-CS free forging angle-closure deep cavity structural parts comprises the following steps: (1) unloading; (2) cubic stock milling; (3) process hole drilling and reaming; (4) rough machining; (5) thermally treating; (6) process hole expanding and reaming;(7) clamping; (8) end head and outer open inclined surface finish-milling; (9) slot cavity finish-milling; (10) slot cavity side wall finish-milling; (11) corner plunge-milling, and bottom corner jointing; (12) other machining processes; and (13) inspection part metering. The milling processing process has the advantages that: firstly, processing efficiency of the parts is greatly improved, and the service life of a tool is effectively prolonged; secondly, a part qualification rate can be effectively increased, and practical production node delivery is met; and thirdly, the part processing process scheme can be taken as reference, and is popularized and used on other parts with similar structures.

Description

technical field [0001] The invention relates to a milling process of free forging aluminum alloy parts, belongs to the field of aviation precision manufacturing and processing, and in particular relates to a milling process of LD5-CS free forging closed angle deep cavity structural parts. Background technique [0002] LD5-CS free forging aluminum alloy is a very important machining material, which is widely used in the field of aerospace manufacturing and processing. [0003] Closed-angle deep cavity is a typical machining feature of five-axis parts. This type of part has a complex structure and often contains deep cavities, making it difficult to process. It has always been a difficult problem in the field of mechanical processing. The difficulty of machining such parts is mainly reflected in the following two aspects: On the one hand, the parts contain a closed-angle structure, which determines that the five-axis machine tool needs to be swung to a certain angle to cut the...

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Problems solved by technology

The difficulty of machining such parts is mainly reflected in the following two aspects: On the one hand, the parts contain a closed-angle structure, which determines that the five-axis machine tool needs to be swung to a certain angle to cut the parts during the processing process to meet the size and accuracy requirements; at the same time This type of parts also has deep cavity structure, often the depth of these grooves is generally between 80~120mm, the corner of each groove is generally R5 or R6, and the bottom angle of the groove is generally R3. When selecting the tool for the cavity, the rigidity and dynamic balance of the tool should be considered. The appropriate tool length-to-diameter ratio should be used, and the lengthened tool holder should be used reasonably for clamping to ensure the surface processing quality of the part. However, because the tool holder is too long, the overall rigidity of the tool is insufficient. The cutting parameters of the machine tool must be reduced accordingly, resulting in extremely low cutting efficiency of parts and long processing time; on the other hand, compared with the traditional aluminum alloy forging processing technology, due to the characteristics of the part material itself during the processing process, the stress cannot be obtained. Effective release will cause large deformation of the part structure and expansion of the cavity, resulting in unguaranteed wall thickness and dimensions, which cannot meet the design requirements; therefore, the traditional processing method of aluminum alloy forgings is no longer suitable for processing such parts

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