Composite Sintered Sliding Member for High-Load Hydraulic Systems
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Solution Overview
Problem
Conventional sliding members with copper-based alloys lack sufficient hardness for high-load environments and abrasion resistance, particularly in hydraulic equipment, and often result in material remnants that increase production costs.
Innovation Solution
A sliding member comprising a first sintered compact layer of iron-based material and a second sintered compact layer of copper-based material, where the second layer is densified through a blast process to achieve a hardness of Hv 150-250, forming a surface with concavities and convexities for improved friction and abrasion resistance, while minimizing material remnants by molding the first layer to match the final product shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a copper-based alloy is used for the sliding layer, then low friction is achieved, but hardness is insufficient for high-load environments
Solution Approach 1:
The invention uses a composite structure with an iron-based sintered compact as the base material and a copper-based sintered compact as the sliding layer. This composite structure combines the low friction properties of copper-based materials with the high strength and hardness of iron-based materials, resolving the contradiction between achieving low friction and maintaining sufficient hardness for high-load environments.
Solution Approach 2:
The copper-based sliding layer is applied only to the sliding surface where low friction is needed, while the iron-based base material provides the structural strength and hardness required for high-load conditions. This local differentiation of material properties allows each layer to perform its specific function optimally.
2Manufacturing precision
If extraction method is used to form the sliding member, then desired shape is achieved, but material remnants are generated
Solution Approach 1:
The iron-based sintered compact is molded into the final product shape before the copper-based sliding layer is applied. This preliminary shaping action eliminates the need for subsequent extraction processes, preventing material remnants from being generated while maintaining manufacturing precision.
3Ease of manufacture
If the second sintered compact layer is not densified, then manufacturing is simpler, but hardness is insufficient
Solution Approach 1:
The invention applies a blast process to change the density parameter of the copper-based sintered compact layer. By increasing the density through this impact process, the hardness of the sliding layer is enhanced to meet high-load requirements while maintaining the overall simplicity of the manufacturing process.
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 provides a sliding member with enhanced hardness and abrasion resistance suitable for high-load applications, reduces material usage and costs by eliminating or minimizing remnants, and maintains low friction through an oil film reservoir on the surface.
Implementation Method 1
The second sintered compact layer is densified by an impact process wherein the powder is collided against one surface of the second sintered compact layer
Implementation Method 2
a first sintered compact layer formed by molding and sintering first metallic powder; and a second sintered compact layer formed on one surface of the first sintered compact layer by molding and sintering second metallic powder
Data Source
AI summary
A sliding member having a hardness proper for an environment where a high-pressure is applied and having a good abrasion resistance. A sliding member 1 comprises a first sintered compact layer 2 formed by solidifying an iron-based metallic powder with a sinter; and a second sintered compact layer 3 formed by solidifying a copper-based metallic powder on a surface of the first sintered compact layer 2 to improve a sliding characteristic. The second sintered compact layer 3 is densified by a blast process where the powder is collided against a surface of the second sintered compact layer 3.