Manufacturing method for ultrathin tegular locking plate of nuclear reactor pressure vessel main bolt

Abstract

The invention provides a manufacturing method for an ultrathin tegular locking plate of a nuclear reactor pressure vessel main bolt, comprising the following steps of: placing a tubular forge piece on a numerically controlled lathe; turning the forge piece and then moving the forge piece to an environment at the temperature of 350-450 DEG C for thermal treatment; then placing the thermally treated forge piece on the numerically controlled lathe with a concave-convex tegular programming; carrying out concave-convex cutting on the circumference of the tubular forge piece with a turning tool the tool nose radius of which is 0.1-0.3mm to ensure that the circumferential wall is cut to be 0.8-2.5mm in thickness to obtain a thin-wall tubular forge piece; then fixing the thin-wall tubular forge piece on the indexing head of a milling machine by using an annular pressing plate and a bolt; milling a waist-shaped hole along the circumferential wall of the thin-wall tubular forge piece by using a centring milling tool and then moving the thin-wall tubular forge piece to the lathe to remove a chunk to manufacture a connected ultrathin tegular locking plate; finally, fixing the connected ultrathin tegular locking plate on linear cutting equipment by using the pressing plate and the bolt, and cutting along a cutting line arranged on the linear cutting equipment to manufacture a single-sheet type ultrathin tegular locking plate. The method has high material use ratio and low cost, and the manufactured ultrathin tegular locking plate is bright and clean and attractive and is accurate in dimension.

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing, and in particular relates to a method for manufacturing an ultra-thin tile-shaped locking piece for a main bolt of a nuclear reactor pressure vessel. Background technique [0002] The ultra-thin tile-shaped locking piece is used for the locking of the nut and the washer of the main bolt of the pressure vessel of the nuclear reactor. It is usually a single-piece ultra-thin tile-shaped locking piece stamped and formed by a single-piece mold opened by the cold stamping forming method. The size error is large; after stamping into a "basin" shape, multiple synthetic molds need to trim the edge to remove the remaining material, so the material utilization rate is low, and the tolerance of the cold stamping parts is above IT14, and the roughness is Ra6.3-12.5. Synthetic molds result in increased costs due to their complex structures. Contents of the invention [0003] The purpose of ...

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Problems solved by technology

[0002] The ultra-thin tile-shaped locking piece is used for the locking of the nut and the washer of the main bolt of the pressure vessel of the nuclear reactor. It is usually a single-piece ultra-thin tile-shaped locking piece stamped and formed by a single-piece mold opened by the cold stamping forming method. The size error is large; after stamping into a "basin" shape, multiple synthetic molds need to trim the edge to remove the remaining material, so the material utilization rate is low, and the tolerance of the cold stamping parts is above IT14, and the roughness is Ra6.3-12.5. Synthetic mold due to complex structure, resulting in increased cost

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