Cutter Head Radial Correction for Deep Hole Precision
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Solution Overview
Problem
Existing hole-making devices lack the ability to correct the cutter head axis during the drilling or boring process, leading to inaccuracies due to insufficient rigidity in the cutter-drive system and inability to control the hole axis, resulting in runoff.
Innovation Solution
A device with a cutter head equipped with a linear drive for radial cutter movement, connected to a CNC system via sensors for work piece wall thickness, rotation angle, and run-out control, allowing for continuous correction of the cutter head axis to maintain precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a long rod is used to transmit motion from the drive to the cutter, then the cutter can be moved radially, but the rigidity of the system decreases leading to increased runoff
Solution Approach 1:
The patent removes the long rod from the system entirely. Instead of transmitting motion through a long rod from a remote drive, the linear drive is extracted and installed directly on the cutter head, eliminating the rod and its associated rigidity problems.
Solution Approach 2:
The linear drive acts as an intermediary mechanism that directly couples the drive force to the cutter without requiring a long rod. By placing the linear drive on the cutter head, it serves as a local intermediary that eliminates the need for the rigid-but-too-long rod connection.
2Device complexity
If the cutter head axis is not monitored during hole making, then the device is simpler, but runoff cannot be detected or corrected
Solution Approach 1:
The patent implements feedback by installing sensors (laser or optical) that continuously monitor the cutter head axis position during hole making. This feedback is sent to the CNC system, which automatically corrects any detected runoff by adjusting the cutter position, thereby maintaining high precision while enabling real-time correction.
Solution Approach 2:
The patent replaces manual or pre-set mechanical positioning with an automated optical/electronic measurement and control system. Sensors substitute for mechanical alignment methods, and CNC-controlled automatic correction replaces manual intervention, achieving higher precision through automation.
3Ease of manufacture
If the cutter position is set before hole making, then the setup is simpler, but the position cannot be corrected during the process
Solution Approach 1:
The patent transforms the static, pre-set cutter position into a dynamic, adjustable position. The linear drive on the cutter head enables real-time radial movement of the cutter during hole making, allowing the system to adapt to detected axis deviations and maintain precision throughout the process.
Data Source
AI summary
A device for drilling or boring openings, primarily deep openings, comprises a cutter head with guides, said head being equipped with a device for displacing the cutter in the radial direction from the drive. The input of the drive is connected via a control signal transmission circuit and a transducer to the output of a system for digital programming control (DPC). A sensor for checking variations in the wall thickness of the component, a sensor of the angle of rotation of the component, a sensor of the angle of rotation of the cutter head and a sensor for checking the wobbling of the component are connected to the DPC system. The drive of the device for displacing the cutter in the radial direction is in the form of a linear drive and is mounted on the cutter head. The technical result is expressed in an increase in the accuracy of machining deep openings while ensuring that said openings can be corrected during the process of machining the openings.