Mold Surface Etching for Adhesion Resistance and Smoothness
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Solution Overview
Problem
Molds used for metal workpieces experience abrasion due to metal adhesion, leading to damage, and existing solutions either enhance surface hardness without improving adhesion resistance or form unevenness that is not suitable for precise molds.
Innovation Solution
A mold with a reinforced layer of hard phase and a smooth surface finish, where the hard phase is WC and the metal phase is Co, with a hard film like diamond-like carbon, and a production method involving surface etching to achieve both adhesion resistance and smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the surface of the mold is made smooth to prevent abrasion powder generation, then abrasion resistance is improved, but adhesion resistance deteriorates due to metal adhesion
Solution Approach 1:
The invention applies different surface properties to different regions: the peak portions maintain high hardness and smoothness for abrasion resistance, while the valley portions have modified composition (enriched hard phase) to provide adhesion resistance. This local differentiation resolves the contradiction between smooth surface requirements and adhesion prevention.
Solution Approach 2:
The surface layer is designed as a composite structure with dual-phase composition (hard phase and metal phase) where the hard phase content varies spatially. The valley portions have higher hard phase content than peak portions, creating a composite structure that simultaneously provides smoothness at peaks and adhesion resistance at valleys.
2Object-generated harmful factors
If a reinforced layer of hard phase is formed on the working surface to improve adhesion resistance, then adhesion resistance is improved, but surface smoothness deteriorates
Solution Approach 1:
The reinforced layer is not uniformly applied but is selectively concentrated in the valley portions of the surface profile. This local concentration of hard phase provides adhesion resistance where needed while leaving the peak portions smooth and precise for their intended function.
Solution Approach 2:
The invention utilizes the curved profile of the surface (peaks and valleys) to strategically position the reinforced layer in the valley regions. The curvature-based surface morphology enables spatial differentiation of material properties without compromising overall surface smoothness.
3Strength
If unevenness is formed on the surface to improve adhesion of coating films, then coating adhesion is improved, but precision and adhesion resistance are compromised
Solution Approach 1:
Instead of creating general surface unevenness, the invention forms the reinforced layer specifically in the valley portions. This localized approach provides sufficient anchoring for coating films where adhesion is needed while maintaining the precision of the peak portions that require smooth surfaces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The mold exhibits improved adhesion resistance and smoothness, reducing wear and tear, and enhancing sliding characteristics while preventing vacuum adhesion and lubrication issues.
Implementation Method 1
a surface layer-modifying step after the shaping step for etching the surface of the mold adjusted to Ra≤0.1 μm and removing the metal phase near the surface through etching
Data Source
AI summary
The purpose of the present invention is to provide a mold having both good adhesion resistance and smoothness, and a production method therefor. Provided is a mold made of a composite material comprising hard phases and metal phases characterized in that the mold has a reinforced layer made of hard phases for a working surface and the working surface satisfies the arithmetic average roughness Ra≤0.1 μm and skewness Rsk≤−0.01. Also provided is a production method for a mold made of a composite material comprising hard phases and metal phases characterized in having: a shaping step for working the surface of the mold made of said composite material and adjusting to Ra≤0.1 μm; and after the shaping step, a surface layer-modifying step for etching the surface of the mold adjusted to Ra≤0.1 μm and removing the metal phases near the surface.