Multi-Layer Machining Mold Assembly for Uniform Circumferential Stress
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Solution Overview
Problem
Existing special-shaped part machining molds experience uneven circumferential stress distribution and local stress concentration, leading to premature wear and cracking, which significantly shortens their service life.
Innovation Solution
A design method for special-shaped part machining molds involves constructing a multi-layer combined mold, analyzing equivalent stress distribution, and adjusting the pressing sleeve ratio to achieve a uniform stress distribution at the matching surface, thereby designing a mold with a non-regularly round profile to mitigate stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a regularly round extrusion mold is used for special-shaped parts, then the mold structure is simple and easy to manufacture, but the circumferential stress distribution is uneven causing local stress concentration and premature failure
Solution Approach 1:
The patent applies asymmetry by changing the mold's cross-sectional shape from a regular round shape to an asymmetric shape that matches the special-shaped part profile. This asymmetric design redistributes the circumferential stress uniformly across the mold surface, eliminating stress concentration zones while maintaining structural integrity and extending mold service life
2Loss of substance
If a multi-layer nested extrusion mold with large asymmetrical forming force is used, then the special-shaped part can be formed with high material utilization ratio, but the stress concentration and tangential tensile stress inside the mold cavity are large causing wear and cracking
Solution Approach 1:
The patent applies local quality by optimizing the local geometry of the mold cavity to match the specific profile requirements of the special-shaped part. This localized geometric optimization ensures uniform stress distribution in high-stress regions while maintaining the multi-layer nested structure for high material utilization ratio
Data Source
AI summary
The present invention relates to a special-shaped part machining mold and design and assembly methods thereof. The design method includes: constructing a multi-layer combined mold according to parameters required by special-shaped part machining; analyzing an equivalent stress distribution after the mold is assembled, selecting a part of equivalent stress evaluation points, and performing equivalent strength simulation to obtain a pressing sleeve ratio change curve circumferentially distributed at a matching surface of the mold; obtaining curve changes at different positions in a circumferential direction of the mold according to the pressing sleeve ratio change curve circumferentially distributed at the matching surface of the mold, so that a new mold is designed; determining whether the new mold has a condition of uneven stress distribution or not; if yes, repeatedly analyzing equivalent stress distribution after the mold is assembled; and if not, completing the design of the mold.