A shrinkable wet bag cold isostatic pressing mold

Abstract

The invention discloses a shrinkable wet bag cold isostatic pressing molding die, which includes a support frame and a molding die that is movably arranged on the support frame, and the molding die includes a hollow cylindrical structure for loading metal powder A flexible mold, a support plate that can shrink together with the flexible mold is arranged around the flexible mold, a steel sheath fixing device is arranged on the periphery of the support plate, and the steel sheath fixing device is arranged on the steel sheath fixing device for The support plate provides an elastic device with elastic force, which is arranged below the steel sheath fixing device for supporting the bottom support device of the steel sheath fixing device, and is arranged above the steel sheath fixing device and can be placed in a top support device of a flexible mold The present invention relates to the technical field of cold isostatic pressing moulds. The molds can shrink together with the flexible molds and provide continuous fixation to the flexible molds to ensure the straightness and dimensional accuracy of the pressed bars.

Description

technical field [0001] The invention relates to the technical field of cold isostatic pressing molding dies, in particular to a shrinkable wet bag cold isostatic pressing molding die. Background technique [0002] Cold isostatic pressing technology refers to the isostatic pressing molding technology carried out at room temperature. Rubber and plastic are usually used as flexible mold materials, and liquid is used as the pressure medium. The maximum pressure can reach 400MPa, and it is mainly used for powder forming. Its purpose is to provide preforms for the next step of sintering, forging or hot isostatic pressing. [0003] The cold isostatic pressing process is very suitable for forming bars with a large length-to-diameter ratio, because it is a new type of powder forming and consolidation technology developed based on Pascal’s principle. In comparison, the dimensional accuracy of the material after cold isostatic pressing is lower, which is mainly affected by the flexibl...

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Problems solved by technology

[0003] The cold isostatic pressing process is very suitable for forming bars with a large length-to-diameter ratio, because it is a new type of powder forming and consolidation technology developed based on Pascal’s principle. In contrast, the dimensional accuracy of the material after cold isostatic pressing is lower, which is mainly affected by the flexible mold used for forming

Due to the quality consistency of flexible molds, such as: the difficulty of controlling the consistency of mold hardness and mold wall thickness, it limits the consistency of mold quality in the mass production process. Mass production, especially when pressing mixed powder materials, due to different powders Different effects of material physical properties, resulting in poor bar size and straightness

[0004] In order to improve the dimensional accuracy and straightness of the pressed material, the current wet bag cold isostatic pressing technology uses a steel sheath to fix the flexible mold to ensure the straightness and dimensional accuracy of the pressed bar. However, the existing steel sheath has disadvantages When the flexible mold and the bar shrink, it is impossible to ensure that the steel sheath continues to fix the flexible mold, resulting in the bending of the bar under the action of gravity, which affects the dimensional accuracy and straightness

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