Machine Tool Torque Compensation via Motor Positioning
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Solution Overview
Problem
Existing machine tools with mechatronic assemblies for machining valve seats on cylinder heads face challenges in achieving high machining accuracy due to the requirement for high moments of force to adjust the assembly and asymmetrical heat input from the adjusting motor, leading to inaccuracies in tool setting.
Innovation Solution
The machine tool incorporates a joint arrangement that allows the mechatronic assembly to be pivoted about multiple axes, with the adjusting motor positioned to compensate for torque and heat input, and an electric spindle motor with a rotor-aligned adjusting motor to minimize heat transfer, along with a hollow shaft and reduction gear system for precise movement and torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the adjusting motor is arranged laterally offset at the end of the machine spindle on the tool head side, then the center of mass of the mechatronic assembly is close to the tool head, but high moments of force are required to adjust the mechatronic assembly
Solution Approach 1:
The adjusting motor is positioned to use its weight as a counterbalancing force that compensates for the torque generated by the tool head weight during pivoting operations. This counterweight principle reduces the net moments of force required for adjustment, making the system easier to operate despite the tool head's offset position.
2Manufacturing precision
If the adjusting motor is arranged laterally offset in relation to the axis of rotation of the machine spindle, then the mechatronic assembly can be compact, but asymmetrical heat input into the tool head leads to inaccuracies in tool setting
Solution Approach 1:
The adjusting motor is deliberately positioned asymmetrically relative to the machine spindle axis, but this asymmetry is controlled to achieve torque compensation rather than causing heat problems. The asymmetric placement allows the motor's weight to counterbalance the tool head torque while maintaining adequate thermal symmetry through proper spacing and mounting configuration.
3Device complexity
If the adjusting motor is positioned close to the tool head, then the mechatronic assembly structure is simplified, but heat from the adjusting motor causes inaccuracies in tool setting
Solution Approach 1:
The adjusting motor serves as an intermediary element that is positioned at an optimal distance from the tool head - close enough to simplify the assembly structure and reduce the number of components, but far enough to minimize thermal interference. This intermediate positioning balances structural simplicity with thermal management requirements.
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 enables the mechatronic assembly to be adjusted with minimal effort while ensuring high machining accuracy by balancing torque and reducing heat-induced inaccuracies, allowing for precise machining of valve seats.
Implementation Method 1
the weight FV of the adjusting motor is at least partially compensates for that torque which causes the weight FG of the tool head when the mechatronic assembly is pivoted about the first axis and/or the second axis
Implementation Method 2
a joint arrangement on which the mechatronics assembly can be pivoted at least about a first axis and about a second axis that is different from the first axis
Implementation Method 3
the rotor axis of rotation of the spindle motor and the rotor axis of rotation of the adjusting motor being aligned with the axis of rotation of the machine spindle
Data Source
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AI summary
The invention relates to a machine tool (100), in particular for machining valve seats (102) on cylinder heads. The machine tool (100) has a mechatronic assembly (10) which has a machine spindle (12). The machine tool (100) comprises a tool head (18) which is held on the machine spindle (12) and which has a basic body (20) and also at least one working slide (22), which is adjustable relative to the basic body (20), for holding a tool (23). The mechatronic assembly comprises an electric adjusting motor (24) which acts on the working slide (22). The machine tool (100) has a support device (106) which holds the mechatronic assembly (10) and which has an articulated joint arrangement (110) at which the mechatronic assembly (10) can be pivoted at least about a first axis (114) and about a second axis (116) which differs from the first axis (114). According to the invention, the adjusting motor (24) is positioned in the mechatronic assembly (10) such that the weight FV of the adjusting motor (24) at least partially compensates the torque caused by the weight FG of the tool head (18) during a pivoting of the mechatronic assembly (10) about the first axis (114) and/or the second axis (116).