Molding Die Surface Texture Control via Local Roughness Differentiation
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Solution Overview
Problem
Existing molding dies fail to produce metal members with controlled surface textures, leading to unsatisfactory surface finishes due to manufacturing-induced unevenness on the inner wall surfaces, which affects the precision and cleanliness of the final product.
Innovation Solution
A molding die design featuring a tubular portion with a smoother inner wall surface compared to the base portion, where the cut level difference in the roughness curve is minimized to enhance surface texture control and improve mold release properties, using ceramics like aluminum oxide for the die components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the inner wall surface of the molding die is made smooth to improve surface texture control, then manufacturing precision improves, but mold release properties deteriorate due to increased adherence
Solution Approach 1:
The patent applies different surface roughness characteristics to different regions of the molding die inner wall surface. Specifically, the cylindrical portion has a smaller cut level difference (Rδc1) for smooth surface texture control, while the bottom portion has a larger cut level difference (Rδc2) to reduce adherence and improve mold release properties. This local differentiation resolves the contradiction between smooth surface requirements and mold release requirements.
2Manufacturing precision
If the inner wall surface is polished to reduce roughness, then surface finish improves, but manufacturing complexity increases due to additional processing steps
Solution Approach 1:
The patent controls the cut level difference parameter (Rδc) during the manufacturing process to achieve the desired surface characteristics. By specifying that Rδc1 in the cylindrical portion is smaller than Rδc2 in the bottom portion, the patent establishes a quantitative parameter control approach that achieves surface finish improvement through controlled manufacturing parameters rather than complex multi-step polishing processes.
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 solution enables the production of metal members with highly controlled surface textures and improved mold release properties, reducing adherence issues and enhancing cleaning efficiency, suitable for applications like electrophotographic photoreceptors and roller bearings.
Implementation Method 1
causing adsorption of the tubular portion and the base portion
Data Source
AI summary
A molding die according to the present disclosure includes a tubular portion and a base portion that closes an end portion of the tubular portion at one side. A cut level difference Rδc1 in a roughness curve of an inner wall surface of the tubular portion is smaller than a cut level difference Rδc2 in a roughness curve of an inner wall bottom portion of the base portion. The cut level difference represents a difference between a cut level at a load length ratio of 25% in a roughness curve and a cut level at a load length ratio of 75% in the roughness curve.