Meshy Hot-Forging Die Surface Layer for Thermal Crack Resistance
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Solution Overview
Problem
Large-scale forging dies prone to elongated irregular cracks on the surface layer due to thermal stress, leading to reduced service life and increased manufacturing costs.
Innovation Solution
A hot-forging die with a conformal meshy structured cavity surface layer, comprising a die substrate, sandwiched, transition, and reinforcement layers, where grooves are constructed and filled with soft materials to distribute stress and prevent crack formation, featuring interconnected mesh structures and specific mechanical properties for high temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional surfacing methods are used on large-scale forging dies, then the die can be manufactured with initial strength, but thermal stress during service causes elongated irregular cracks on the cavity surface
Solution Approach 1:
The cavity surface is segmented into multiple independent mesh units by constructing grooves that divide the continuous surface into discrete cells. This segmentation isolates stress concentrations to individual cells, preventing crack propagation across the entire surface. The mesh structure with typical cell sizes of 50-200mm creates independent stress zones that cannot coalesce into large cracks.
Solution Approach 2:
The surface layer is given non-uniform local properties through the mesh structure, where each mesh cell has different stress distribution characteristics. The groove regions have different mechanical properties compared to the raised surface regions, creating localized zones that can independently accommodate thermal stress without affecting the entire surface.
2Ease of manufacture
If the cavity surface is made uniform and continuous, then manufacturing is simpler, but stress distribution becomes uneven leading to crack formation
Solution Approach 1:
The continuous cavity surface is divided into discrete mesh cells by groove patterns. This segmentation creates a structured non-uniformity that is actually easier to manufacture using standardized groove patterns than to achieve optimal stress distribution through complex continuous variations. The mesh structure provides repeatable stress distribution characteristics.
3Quantity of substance
If reinforcement layer is made as a single continuous layer, then material usage is efficient, but crack propagation is uncontrolled
Solution Approach 1:
The reinforcement layer is segmented into discrete mesh units separated by grooves. While this uses slightly more material than a continuous layer, it provides controlled crack propagation paths along the groove lines. The segmentation prevents uncontrolled crack growth through the entire reinforcement layer by confining cracks to individual mesh cells.
Data Source
AI summary
The present disclosure discloses a hot-forging die with the conformal meshy structured cavity surface layer and a preparation method thereof. A large-scale hot-forging die includes a die substrate, and a sandwiched layer, a transition layer and a reinforcement layer are formed on the die substrate in sequence. The reinforcement layer and the transition layer are separated into a plurality of small units by the grooves. All the grooves are interconnected and communicated to form a meshy structure. The transition layer grooves are filled with ordinary soft material; the reinforcement layer grooves are filled with high temperature resistant soft material. The reinforcement layer material and the high temperature resistant soft material of the present disclosure cooperate with each other to obtain a cavity surface layer with properties of both hard and soft, strong and tough, which can fully release the large tensile stress that may occur on the surface of the die cavity during the welding process and under the service conditions of the die, so as to avoid hot cracks during welding process and service process.