Method for checking strength of energetic material explosive pressing tool

By combining theoretical calculations and finite element simulations, the strength of the pressure bar and the upper pressure block was checked, which solved the problems of brittle cracking and insufficient stiffness of the high-hardness material pressing tooling, and ensured the structural integrity and safety of the tooling under high loads.

CN122287189APending Publication Date: 2026-06-26NANJING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610263941.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-05
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing methods for verifying the strength of press tooling are insufficient to predict the risk of brittle cracking when used with high-hardness mold steel and cemented carbide, and they fail to effectively incorporate stiffness constraints, leading to tooling deformation or breakage, which affects production safety and efficiency.

Method used

An analytical method combining theoretical calculation and finite element simulation was adopted to check the strength of the pressure bar and the upper pressure block, including the crush strength and stability. The mechanical behavior was determined by numerical simulation to ensure that it is within the elastic range.

Benefits of technology

This enabled reliable strength verification of the propellant pressing fixture, ensuring its structural integrity under high loads and avoiding scrap due to brittle cracking or insufficient stiffness, thus laying a reliable foundation for propellant pressing tests.

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Abstract

The invention discloses a method for checking the strength of an energetic material explosive pressing tool, which comprises the following steps: weak parts of the energetic material explosive pressing tool are determined to carry out strength checking, and the weak parts are a pressing rod and an upper pressing block; the strength checking comprises crushing strength checking and stability checking of the compression bar and quantitative evaluation of stress distribution of the compression bar and the upper pressing block under axial load, the mechanical behavior of the contact position of the compression bar and the upper pressing block is investigated, and the strength is judged from the angle of numerical simulation; an analysis method combining theoretical calculation and finite element simulation is adopted, and strength checking and verification of the pressing rod and the upper pressing block of the special explosive pressing tool are completed. The method can confirm that the stress and deformation of the explosive pressing tool are within the elastic range, and the structural integrity meets the requirement.
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