Machine Tool Feed Shaft Compensation for Workpiece Movement
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Solution Overview
Problem
Existing machine tools face issues with workpieces moving during operations, leading to inaccuracies in dimensions due to undesired movements, such as back movement or deformation, affecting the quality of work performed.
Innovation Solution
A machine tool system with a drive shaft equipped with a rotational drive motor and a feed motor, coupled with a distance measuring device and control unit, allows independent control of the drive shaft's rotation and axial movement, compensating for relative movements between the workpiece and the machine frame, ensuring precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a traditional machine tool with coupled rotation and feed mechanisms is used, then the structure is simpler, but the workpiece moves during operations leading to inaccurate dimensions
Solution Approach 1:
The drive shaft is divided into two independent segments: a first segment coupled to the rotational drive motor for rotation, and a second segment coupled to the feed motor for axial movement. This segmentation allows independent control of rotational and axial movements, preventing workpiece displacement and improving dimensional accuracy.
Solution Approach 2:
The system dynamically adjusts the axial position of the drive shaft during work operations using the feed motor. The control unit monitors workpiece position and commands axial movement of the second drive shaft segment to compensate for any workpiece displacement, maintaining manufacturing precision throughout the operation.
2Measurement precision
If the drive shaft axial movement is coupled with rotation, then the mechanism is more integrated, but the axial position cannot be precisely controlled independently
Solution Approach 1:
The drive shaft is segmented into rotationally independent sections, with the second segment being axially movable relative to the first segment. This allows the feed motor to control axial position independently of the rotational drive motor, achieving precise axial positioning without compromising rotational function.
Solution Approach 2:
The second segment of the drive shaft acts as an intermediary between the feed motor and the tool holder. It transmits axial movement from the feed motor while being rotationally decoupled from the first segment, enabling independent axial control without interfering with rotational motion.
3Reliability
If a distance measuring device and compensation system are added, then workpiece movement compensation is achieved, but the device complexity increases
Solution Approach 1:
The distance measuring device continuously monitors the axial distance between the workpiece and machine tool frame, providing feedback to the control unit. The control unit processes this information and commands the feed motor to adjust the drive shaft axial position, creating a closed-loop feedback system that automatically compensates for workpiece movement and enhances work stability.
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
Enables precise and reliable workpiece processing by maintaining the tool's position relative to the workpiece, even with movements, ensuring accurate dimensions and effective chip fragmentation.
Implementation Method 1
a first motor, called a rotational drive motor, which is a rotary motor configured to rotate at least one portion of said drive shaft
Implementation Method 2
a second motor, called a feed motor, said feed motor being configured to axially move said drive shaft, and being preferably a linear motor
Data Source
AI summary
The invention relates to a system and a method for working a workpiece (P1) using a machine tool (M1) comprising a drive shaft (400) provided with a tool holder (600) to which a tool (900) can be coupled, a drive motor (2) for rotating at least one portion of the drive shaft (400), which portion is fitted with the tool holder (600); a feed motor (3) for axially moving the drive shaft (400). A device measures a distance representative of the distance between the workpiece (P1) and the frame (100) of the machine tool. A control unit (8) is configured to execute work operations on the workpiece by controlling the drive motor and/or the feed motor; to determine a change in the axial distance between the frame of the machine tool and the workpiece resulting from relative axial movement between the workpiece and the frame. The second motor is controlled so as to axially move the drive shaft in order to compensate for the relative axial movement between the workpiece and the frame.