Large-amplitude-necking seamless forming process for stainless steel cup body

Abstract

The invention discloses a large-amplitude-necking seamless forming process for a stainless steel cup body. The large-amplitude-necking seamless forming process for the stainless steel cup body comprises the following steps that step 1, a circular tube with an outer diameter of D is cut out, and water distension is carried out to enable the circular tube to form an original shape of the stainless steel cup body; step 2, metal processing is carried out to form a first cup body with the maximum diameter of D<1>, the upper mouth part of the first cup body is in a straight tube shape with a diameter of D<2>; step 3, a tube material with a diameter of D<3> is cut out and stretched to form a stretching head, and the diameter of the lower section of the stretching head is D<4>, and D<4> is equal to D<2>; step 4, the upper mouth part of the first cup body and the lower mouth part of the stretching head are subjected to butt welding to form an integral cup body; and step 5, a necking machine isused for necking the welded part of the integral cup body. According to the large-amplitude-necking seamless forming process for the stainless steel cup body, the limitation of the inherent elongationof stainless steel is broken through, the amplitude-necking ratio of the cup body and a cup mouth can be greatly increased, the product qualification rate of the necking process and the vacuum qualification rate of the product are improved, and the shape and specifications of stainless steel water cup body is expanded.

Description

technical field [0001] The invention relates to a forming process of a stainless steel cup, in particular to a seamless forming process of a large-shrink stainless steel cup body with a large diameter difference between the cup body and the cup mouth. Background technique [0002] The production of stainless steel cup body (referring to the cup body of a single-layer stainless steel water cup, or the inner tank / outer shell of a stainless steel thermos cup, the same below) generally adopts an integral molding process. For example, the Chinese invention application with the application number of 201711069013.4 "A thermos cup forming mold and its forming process", the application number of the Chinese invention application with the application number 201911034746.3 "The production process of the large wide mouth liner of the thermos cup", the application number is 201810804750.2's Chinese invention application "A Process Method for Thinning the Inner Liner of a Thermos Cup" and...

AI Technical Summary

Problems solved by technology

But this method has the following defects: 1. The welding seam is difficult to polish due to the interference of the thread next to it, and the weld seam burr cannot be completely removed. The proportion of the product has risen sharply, resulting in a low vacuum qualification rate of the product

2. The appearance is obviously not integrally formed, and it cannot meet the product process requirements. Although it can realize mold opening and proofing, it cannot be mass-produced stably

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