Bend forming die and forming method

Abstract

The invention discloses a bend forming die and forming method, and belongs to the technical field of bend production. The bend forming die includes a die body, an ingot block pushing device and a corerod pushing device, wherein, a die cavity is formed in the middle of the die body, and the size of the die cavity is consistent with the outer size of a to-be-formed bend; the ingot block pushing device is used for pressing a heated ingot block into the die cavity to form a solid bend outline; and the core rod pushing device is provided with a core rod, the core rod pushing device is used for pushing the core rod to move in the die cavity along a curved arc, so that a center hole is formed in the solid bend outline, and the size of the core rod is consistent with the inner size of the to-be-formed bend. According to the bend forming die and forming method, a proximate matter production process can be omitted, the ingot block is directly machined to a bend, the middle process is omitted, and the production efficiency is improved; and the production cost is reduced, and the finished bend has regular inner surface and outer surface shapes and even wall thickness.

Description

technical field [0001] The invention relates to the technical field of elbow manufacturing, in particular to an elbow forming die and a forming method. Background technique [0002] Elbows are an important part of piping systems. The current elbow is mainly processed by straight steel pipe or steel plate, and the processing method is mold forming. Most elbows need to be heat-treated before forming, which makes them prone to plastic deformation. From the perspective of whether a welding process is required, elbows are divided into seamed elbows and seamless elbows. Seamless elbows are divided into mold pressing, pushing and so on. Forged elbows can be machined directly from blanks. The forming method of the seamed elbow can not only roll the steel plate into a steel pipe, and then hot press or push it, but also can be formed from the steel plate, first forming two halves separately, and then welding them together. There are also so-called "shrimp waist" elbows, which are...

AI Technical Summary

Problems solved by technology

[0004] The inventor found that the current elbow forming method has at least the following disadvantages: (1) many processes, high cost and low efficiency

(2) Low forming precision

For traditional hot-pressed elbows, the forming mold only acts on the outside. Although the external shape can be guaranteed to be relatively regular, the internal shape cannot be guaranteed. The use of end braces and center braces can reduce irregularities to a certain extent, but the effect is limited

(3) Uneven wall thickness

For elbows processed by traditional forming technology, the wall thickness will increase or decrease during the forming process, and there is a problem of uneven wall thickness

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