Pure Niobium Plate End-Group Components for Superconducting Cavities
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Solution Overview
Problem
The manufacturing of pure niobium plate end-group components for superconducting high frequency accelerator cavities faces challenges with conventional machining and waterjet cutting followed by cold forging, including foreign objects on the surface, necking, and high production costs, which hinder mass production and affect the superconducting characteristics.
Innovation Solution
A method combining innovative shear-blanking and forging techniques, with a very small clearance between the shear-blanking punch and die, high-speed shear-blanking, and temperature-controlled forging to produce near net shape semi-products without foreign objects and minimize necking, using a servo-mechanized press machine and solid-state film lubrication to prevent seizure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional machining or waterjet cutting followed by cold forging is used, then the HOM antenna can be produced, but foreign objects remain on the surface and necking occurs
Solution Approach 1:
The invention changes the fundamental manufacturing parameter from subtractive machining to whole press-forming. By transitioning to a forming process with very small clearance between punch and die, the method eliminates foreign object contamination and necking while achieving the required dimensional precision for the HOM antenna
Solution Approach 2:
The invention extracts and eliminates the harmful intermediate steps of machining and waterjet cutting that introduce foreign objects. By going directly from plate to final shape through press-forming, the problematic intermediate processing stages are removed entirely
2Reliability
If pure niobium plate is used for HOM antenna, then superconducting characteristics are achieved, but the material is extremely expensive and tough for machining and press-forming
Solution Approach 1:
The invention changes the manufacturing approach from machining to whole press-forming with controlled clearance and temperature. This parameter change makes the tough pure niobium material workable while preserving its superconducting properties, avoiding the need for expensive and difficult machining operations
3Shape
If conventional cold forging is used, then the HOM antenna shape is achieved, but seizure with tooling occurs and productivity is low
Solution Approach 1:
The invention introduces temperature control as a new parameter, performing press-forming at temperatures above room temperature but below the blue brittleness range. This temperature parameter change prevents seizure with tooling, enables smooth material flow, and makes mass production feasible while achieving the complex HOM antenna shape
4Manufacturing precision
If very small clearance is used in shear-blanking, then near net shape semi-product is obtained, but the binding tool must generate counter force
Solution Approach 1:
The invention applies preliminary binding to hold the pure niobium plate before and during the shear-blanking operation. This preliminary action prevents plate movement and enables the use of very small clearance for high precision near net shape production, as the binding tool provides the necessary counter force to stabilize the material
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 eliminates surface contaminants and necking issues, reduces material costs, and ensures stable operation of the accelerator, enabling efficient mass production of high-quality end-group components.
Implementation Method 1
shear-blanking procedure of said pure niobium plate different from the conventional fine blanking, wherein the clearance that is defined as a gap between outer and inner diameters of the respective shear-blanking punch and die is set to be very small value below 0.5% of pure niobium plate thickness
Implementation Method 2
shear-blanking tooling die is installed with the cooling device for extraction of heat generated in said procedure
Implementation Method 3
a press machine installed with servo mechanism for controlling of speed and motion of said pure niobium plate
Implementation Method 4
tooling die and punch for said forging are surface-treated followed by being subject to solid-state film type lubricant having dynamic friction behavior independent upon temperature in order to prevent the material from seizure
Implementation Method 5
forging procedure at different temperatures from any of the conventional hot or warm or cold forging, wherein press forging is conducted to be free from the occurrence of blue brittleness/necking and to bring about prominent metal-flow, sufficient formability, the size accuracy in any portion of a product and the margin of further press-forming by controlling forging temperature to be below 200° C. and beyond ambient room temperature
Data Source
AI summary
Targeting mass production, the present invention provides an advanced method of manufacturing pure niobium plate end-group components from pure niobium plate material for superconducting high frequency accelerator cavity by means of innovative shear-blanking followed by innovative forging procedures, wherein the invention is to convert the procedure/production method from the conventional machining or waterjet cutting followed by the conventional cold forging to the whole press-forming The invention gives the drastic effects on cost-effectiveness and press-performance.