Milling Machine Spindle Deflection Correction via Pressure Control
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Solution Overview
Problem
Conventional milling machines experience deformation due to gravity or other forces, leading to manufacturing errors and reduced precision.
Innovation Solution
A deflection correction system comprising a control unit, displacement sensor, pressure cylinders, and pressure sensors that automatically adjust fluid pressure to maintain alignment of the main spindle seat along the axis, using a motor to drive displacement and control the position of the spindle seat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the main spindle seat is made rigid to maintain structural stability, then structural strength is improved, but deformation due to gravity or other forces cannot be corrected, leading to manufacturing errors
Solution Approach 1:
The patent applies dynamics by making the main spindle seat adjustable rather than completely rigid. The seat can dynamically change its position along the axis to compensate for deformation, allowing it to maintain both structural integrity and manufacturing precision through active correction mechanisms.
Solution Approach 2:
The patent implements feedback by using sensors to detect the actual position of the main spindle seat and comparing it with the desired position. This feedback information is used to generate correction signals that adjust the seat's position, thereby maintaining manufacturing precision despite gravitational or operational deformations.
2Manufacturing precision
If the main spindle seat is made adjustable to correct deformation, then manufacturing precision is improved, but device complexity increases due to additional correction mechanisms
Solution Approach 1:
The patent replaces complex mechanical adjustment mechanisms with a more streamlined system that uses controlled displacement along the axis. Instead of multiple mechanical components for correction, the system uses a controlled positioning mechanism that simplifies the overall device complexity while maintaining manufacturing precision.
Solution Approach 2:
The patent applies universality by designing the main spindle seat to perform multiple functions: it serves as both a structural support component and an adjustable positioning element. This multi-functionality reduces the need for separate correction devices, thereby reducing device complexity while maintaining precision.
3Manufacturing precision
If sensors and control systems are added to detect and correct deflection, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies self-service by enabling the main spindle seat to automatically detect its own position and correct its own alignment through integrated sensors and control systems. The seat monitors its own deflection and performs self-correction, eliminating the need for external complex correction devices and reducing overall system complexity.
Solution Approach 2:
The patent merges the detection and correction functions into the main spindle seat itself. The sensors, control systems, and adjustment mechanisms are integrated into a unified system, reducing the number of separate components and simplifying the overall device complexity while maintaining manufacturing 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
The system increases manufacturing precision by controlling pressure within the pressure cylinders to correct deformation, ensuring accurate positioning of the spindle seat, thereby enhancing the overall precision of milling operations.
Implementation Method 1
The pressure cylinder includes a cylinder body to be fixed to the main spindle seat and to be disposed proximate to a first end portion of the main spindle seat, and a control rod extended retractably into the cylinder body. The pressure cylinder is operable to move the control rod
Data Source
AI summary
A milling machine has a carriage, a main spindle seat extending along an axis, and a motor operable to drive displacement of the main spindle seat relative to the carriage along the axis. A deflection correction system includes a control unit, a displacement sensor, at least one pressure cylinder, and a pressure sensor. The pressure cylinder includes a cylinder body, and a control rod extended retractably into the cylinder body. The control unit is configured to determine a pressure range as a function of displacement detected by the displacement sensor, and to maintain fluid pressure in the pressure cylinder within a pressure range, thereby controlling the control rod via the cylinder body to position the second end portion of the main spindle seat relative to the axis.