Retractable wet bag type cold isostatic pressing forming die

Abstract

The invention discloses a retractable wet bag type cold isostatic pressing forming die. The retractable wet bag type cold isostatic pressing forming die comprises a support frame, a forming die, a flexible die, support plates, a steel sheath fixing device, an elastic device, a bottom support device and a top support device, wherein the forming die is movably arranged on the support frame; the forming die comprises a flexible die which is of a hollow cylindrical structure and used for loading metal powder; the support plates are arranged around the flexible die and can retract along with the flexible die; the steel sheath fixing device is arranged at the periphery of the support plates; the elastic device is arranged on the steel sheath fixing device and used for providing elastic force forthe support plates; the bottom support device is arranged below the steel sheath fixing device and used for supporting the steel sheath fixing device; and the top support device is arranged above thesteel sheath fixing device and can be used for placing the flexible die. The invention relates to the technical field of isostatic cool pressing forming dies. The isostatic cool pressing forming diecan retract along with the flexible die and continuously fix the flexible die, so that the straightness and the dimensional precision of a pressed bar are ensured.

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...

AI Technical Summary

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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