Large-cutting-depth turning and milling composite rotary blade used under heavy-load condition

Abstract

The invention discloses a large-cutting-depth turning and milling composite rotary blade used under a heavy-load condition, belongs to the technical field of heavy machining, and can solve the problems that when a large special-shaped forge piece of a water chamber end cap is subjected to heavy cutting, due to relatively large cutting depth, a cutter is subjected to a dynamically-changed mechanical impact effect, consequently the cutter is stressed unevenly, and therefore phenomena such as abrasion, tipping and breakage are generated; and meanwhile, a large amount of cutting heat is accumulated in a cutting contact area in the cutting process, and the problems such as blade-chip adhesion between the cutter and the cutting chips caused by poor heat dissipation conditions are solved. The cutting edges of the blade are negative chamfered cutting edges; and every two adjacent negative chamfered cutting edges have arc edge transition there-between; cylindrical micro-pit textures arranged triangularly are arranged near an arc edge; the side surface of a square protruding platform at the upper surface of the blade and rake faces form arched chip breaking grooves; a trapezoid-like bump isarranged at the intersection position of the rake faces of the blade; each rake face is provided with a water drop-shaped bump; a major flank and a minor flank of the blade are each provided with a micro-groove texture; and the geometric center of the blade is provided with a fastening screw hole used for being connected with a turning tool bar or a facing cutter. The large-cutting-depth turning and milling composite rotary blade provided by the invention is suitable for turning and milling composite machining which adopts the water chamber end cap as a typical large-size forge piece.

Description

technical field [0001] The invention relates to a large depth of cut turn-milling composite indexable insert under heavy-load conditions, which belongs to the technical field of heavy-duty cutting. Background technique [0002] As a key part of the AP1000 nuclear island evaporator of the third-generation nuclear power plant, the head of the nuclear power water chamber is made of 508Ⅲ high-strength steel, and the blank is directly forged. Defects such as shovel groove, forging pit bag, metal oxide skin, metal covering, etc. At present, the cutting methods for processing water chamber head parts mainly include heavy-duty turning and heavy-duty milling. The material removal rate can reach more than 70% when the blank parts of the water chamber head are processed into finished products; the cutting depth is large during the processing, resulting in high cutting force, and the tool is subjected to mechanical impact, which easily leads to different degrees of damage to the cuttin...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a large depth of cut turn-milling compound indexable insert under heavy load conditions, which mainly solves the problem of large-scale special-shaped forgings of heavy-duty cutting water chamber heads due to large cutting parameters and dynamically changing mechanical impact on the cutter. Uneven stress on the tool leads to wear, edge chipping, fracture, etc.; at the same time, a large amount of cutting heat accumulates in the cutting contact area during the cutting process, resulting in tool-chip bonding between the tool and the chip, as well as short tool life and low processing efficiency. low level problem

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