Machine Tool Spindle Layout for Stable Friction Welding
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Solution Overview
Problem
Conventional machine tools with movable spindles in the axial direction often face difficulties in smoothly performing friction-welding of workpieces.
Innovation Solution
A machine tool configuration with a first spindle and a second spindle, where the first spindle is maintained stationary while the second spindle is moved axially to control the friction-welding process, utilizing a control system to manage the relative rotation and axial movement, and incorporating a torque detection mechanism to resist applied torque, ensuring the first spindle remains stationary during welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both spindles are provided as movable in the axial direction, then the machine tool structure is flexible and adaptable, but it becomes difficult to smoothly carry out the friction-welding process
Solution Approach 1:
Instead of making both spindles movable as in conventional designs, the invention inverts the approach by making one spindle (first spindle) stationary and only the second spindle movable. This inversion resolves the contradiction by providing the necessary stability for smooth friction-welding while maintaining operational flexibility through the controllable second spindle.
Solution Approach 2:
The invention applies different mobility characteristics to different spindles: the first spindle is fixed to provide a stable reference point and resist torque during welding, while the second spindle is made movable to enable precise positioning and control. This local differentiation of quality (stationary vs. movable) allows the system to achieve both stability and adaptability simultaneously.
2Ease of operation
If the first spindle is maintained stationary during friction-welding, then the welding process becomes smoother and more controllable, but the drive system must handle larger torque and inertia requirements
Solution Approach 1:
The stationary first spindle acts as a counterbalance or anchor that resists the torque generated during friction-welding. By providing a fixed reference point, the first spindle counteracts the rotational forces and inertia effects that would otherwise make control difficult, allowing the movable second spindle to perform the welding operation smoothly.
3Productivity
If only the second spindle is moved axially while holding the first spindle stationary, then the friction-welding process is simplified and controlled, but the inertia difference between the two drive systems must be managed
Solution Approach 1:
The invention creates an asymmetric drive system where the first drive source is designed with higher inertia capabilities to maintain the stationary spindle against torque, while the second drive source is optimized for precise axial movement with lower inertia. This local optimization of inertial properties allows efficient welding operation while managing the inherent inertia difference between the two systems.
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 configuration allows for smooth friction-welding by maintaining the first spindle stationary despite axial movement of the second spindle, enhancing the welding process's stability and efficiency.
Implementation Method 1
bring the workpiece held by the first main shaft and the workpiece held by the second main shaft into contact with each other while rotating them relative to each other, thereby to carry out the friction-heating
Implementation Method 2
stop the relative rotation of the pair of workpieces and move only the second main shaft in the axial direction while holding the first main shaft stationary, thereby to carry out friction-welding of the pair of workpieces
Data Source
AI summary
A machine tool includes a first main shaft, a first drive source for moving the first main shaft, a second main shaft, a second drive source for moving the second main shaft, and a control means for carrying out a control so as to bring the workpiece held by the first main shaft and the workpiece held by the second main shaft into contact with each other while rotating them relative to each other, thereby to carry out the friction-heating, and to stop the relative rotation of the pair of workpieces and move only the second main shaft in the axial direction while holding the first main shaft stationary, thereby to carry out friction-welding of the pair of workpieces. The control means controls the operation of the first drive source upon the friction-welding of the pair of workpieces, so as to maintain the axial position of the first main shaft.