Electroformed Mold Inserts Bonding Strength via Reinforced Ribs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electroforming techniques are slow, and the bonding strength between the metal spraying thickened layer and the electroformed layer is poor due to tension stress, leading to potential peeling and deformation issues.
Innovation Solution
The method involves forming stereoscopic reinforced ribs on an electroformed shell mold, followed by additional electroforming layers and a nickel aluminum alloy layer with a coarse surface to enhance bonding, and then applying a metal spraying thickened layer, which is ground to improve surface quality and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal spraying is used to thicken the electroformed mold insert, then the depositing speed is greatly increased, but the bonding strength between the metal spray thickened layer and the electroformed layer deteriorates due to tension stress
Solution Approach 1:
The patent applies preliminary action by performing electroforming to create a reinforcement layer and stereoscopic reinforced ribs before applying the metal spray thickened layer. This preliminary electroformed structure provides a strong bonding base that can withstand the tension stress generated during subsequent metal spraying, preventing peeling while maintaining high depositing speed
Solution Approach 2:
The patent uses composite materials by combining electroformed metal layers with metal spray thickened layers. The electroformed layer provides a dense, strong base structure, while the metal spray layer provides rapid material buildup. The interface between these two different deposition methods is strengthened through the electroformed reinforcement layer and ribs, creating a composite structure that leverages the advantages of both techniques
2Loss of time
If the thickness of the metal spray layer is increased to reduce electroforming time, then the depositing speed advantage is enhanced, but the tension stress increases causing the layer to peel off
Solution Approach 1:
The electroformed reinforcement layer and stereoscopic ribs are formed in advance before metal spraying. This preliminary structure creates a strong anchoring system that can support increased metal spray thickness without peeling, allowing the full thickness advantage of metal spraying to be realized
Solution Approach 2:
The patent introduces a third dimension by creating stereoscopic reinforced ribs that protrude from the electroformed layer surface. These ribs provide mechanical interlocking with the metal spray layer, adding a geometric dimension to the bonding mechanism beyond simple surface adhesion, thereby enabling thicker layers to bond effectively
3Manufacturing precision
If conventional electroforming is used to maintain precision, then the manufacturing accuracy is ensured, but the depositing speed is very slow requiring six to eight weeks for 30 mm thickness
Solution Approach 1:
The patent segments the mold fabrication process into two distinct phases: first, electroforming to create a precise base layer and reinforcement structure that establishes the exact geometric profile; second, metal spraying to add thickness to the already-formed precise structure. This segmentation allows each process to optimize for its specific function - electroforming for precision and metal spraying for speed
Solution Approach 2:
The electroforming process is performed in advance to establish the precise geometric profile and reinforcement structure before metal spraying begins. This preliminary action ensures that the high-precision electroformed layer serves as a template and bonding base, while the subsequent metal spraying rapidly adds thickness without compromising the underlying precision
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
This approach significantly increases the bonding strength and mechanical integrity of the metal spraying thickened layer, reducing the risk of peeling and deformation, thus accelerating the electroforming process while maintaining precision.
Implementation Method 1
Electroforming is an electroplating technique to produce a thick layer of metal shell mold on a mandrel
Implementation Method 2
submerging the mandrel in a first electroforming solution to form an electroformed shell mold
Implementation Method 3
metal spraying is a physical metal depositing technique that has a high depositing speed
Data Source
AI summary
A method for enhancing bonding strength of a metal spraying thickened layer of electroformed mold inserts includes the following procedures: forming a plurality of stereoscopic reinforced ribs on an electroformed metal shell mold by metal spraying; covering the stereoscopic reinforced ribs and the electroformed metal shell mold to become an integrated body by electroforming; forming a metal thickened layer by metal spraying; forming a second electroformed cover and forming a metal key bond between the electroformed cover and the metal thickened layer. The method of the invention can shorten fabrication time of the electroformed mold insert and improve the mechanical strength and soldering affinity of the metal thickened layer.