A large-shrink seamless forming process of stainless steel cup body

Abstract

The invention discloses a large-scale reduction seamless forming process for a stainless steel cup body. For the first cup body of D1, the upper section of the first cup body has a straight cylindrical shape with a diameter of D2; step 3, intercept a pipe material with a diameter of D3, stretch to form a stretching head, and the diameter of the lower section is D4=D2; step Fourth, butt-weld the mouth of the upper section of the first cup body and the mouth of the lower section of the stretching head to form an integral cup body; Step 5, use a shrinking machine to shrink the welded part of the integral cup body. The large shrinkage seamless forming process of the stainless steel cup body of the invention breaks through the inherent elongation limit of stainless steel, can greatly improve the shrinkage ratio between the cup body and the cup mouth, and improve the product qualification rate of the shrinking process and the vacuum qualification rate of the product. , which expands the shape and specifications of stainless steel water cups.

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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