Screw Spindle Wear-Resistant Layer Encapsulation
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Solution Overview
Problem
Screw spindle machines with internal wear-resistant SiC layers face limitations in withstanding high internal pressures due to the brittle nature of SiC and the resilience of adhesives, leading to potential cracking and restricted maximum fluid pressure capacity.
Innovation Solution
Encapsulating the wear-resistant SiC layer in a steel shell that matches the outer periphery, using thermal shrink fitting or press fitting to stabilize the layer and prevent cracking, leveraging the higher tensile strength of steel to manage internal pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the wear resistant layer is made of SiC material, then wear resistance is improved, but tensile strength and pressure withstanding capability deteriorate due to brittleness
Solution Approach 1:
The patent applies composite materials by combining SiC wear-resistant layer with steel shell and adhesive matrix. The SiC layer provides wear resistance while the steel shell provides tensile strength and pressure withstanding capability, creating a composite structure that leverages the advantages of both materials to resolve the contradiction between wear resistance and crack resistance.
Solution Approach 2:
The adhesive layer acts as an intermediary between the SiC wear-resistant layer and the steel shell. This intermediary layer provides a resilient bonding that allows the brittle SiC layer to be stabilized by the steel shell while preventing direct stress concentration at the interface, thereby preventing crack formation under internal pressure.
2Ease of manufacture
If adhesive is used to mount the wear resistant layer, then ease of manufacture is improved, but reliability deteriorates due to adhesive resilience causing cracking under high pressure
Solution Approach 1:
The adhesive layer serves as an intermediary element that provides both ease of manufacture through flexible mounting and reliability by creating a resilient bond that prevents stress concentration. The adhesive's resilience allows the brittle SiC layer to be stabilized by the steel shell while preventing crack formation under internal pressure.
Solution Approach 2:
The composite structure consisting of SiC layer, adhesive matrix, and steel shell works together to resolve the contradiction. The adhesive provides manufacturing flexibility while the composite structure as a whole ensures reliability under pressure by distributing stresses throughout the multi-material system.
3Volume of moving object
If the casing dimensions are reduced, then device compactness is improved, but pressure withstanding capability deteriorates for given wall thickness
Solution Approach 1:
The patent uses composite materials with the steel shell providing structural strength and pressure withstanding capability while the SiC layer provides wear resistance. This composite construction allows the casing to withstand higher internal pressures with reduced wall thickness, enabling more compact dimensions while maintaining pressure capacity.
Solution Approach 2:
The invention changes the material parameters by using high-strength steel and SiC composite materials, which allows the casing to achieve higher pressure withstanding capability with thinner walls. This parameter change enables compact casing dimensions while maintaining the required pressure capacity.
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 steel shell effectively stabilizes the SiC layer, allowing the screw spindle machine to withstand higher internal pressures without cracking, ensuring reliable operation and increased fluid pressure capacity.
Implementation Method 1
the steel shell is heated, so that the thermal expansion of the steel results in an increase of the internal cross-section and, consequently, the shell can readily be thrust onto the hollow body
Implementation Method 2
Subsequently, the steel cools down, and the shell shrinks to the external diameter of the hollow body, so that the latter is firmly enclosed in the shell
Data Source
AI summary
A screw spindle machine having a tubular casing (10) that is made of cast metal and is lined with a wear resistant layer (16), with the wear resistant layer (16) being encapsulated in a steel shell (20) that matches the outer peripheral shape of the layer (16).