Power Tool Distance Control for Precise Borehole Depth
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Solution Overview
Problem
Existing machine tools for drilling cylindrical boreholes face inaccuracies in measuring and achieving the desired borehole depth, leading to problematic handling and precision issues.
Innovation Solution
A method for open-loop and closed-loop control of a power tool connected to at least one acquisition apparatus, which involves acquiring distance values using sensors, adjusting the power tool's operating modes based on these values, and transmitting signals to control the drilling process accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing measurement apparatuses are used to measure borehole depth, then the measurement process is simple, but the measurement precision is insufficient
Solution Approach 1:
The measurement system is segmented into multiple independent distance sensors positioned at different locations on the power tool. Each sensor independently measures distance to the workpiece, and the control device processes these individual measurements to calculate precise borehole depth and detect tool orientation, thereby achieving high measurement precision through distributed sensing rather than a single complex apparatus
Solution Approach 2:
The distance sensors serve multiple functions: they measure borehole depth by calculating distance changes, detect skewed tool orientation by comparing distance values from different positions, and provide feedback for closed-loop control. This multi-functionality eliminates the need for separate measurement apparatuses while achieving high measurement precision
2Adaptability or versatility
If the power tool operates in a single mode, then the operation is simple, but the adaptability to different drilling conditions is limited
Solution Approach 1:
The power tool implements dynamic operation modes that automatically adjust drilling parameters based on real-time distance measurements. The control device transitions between different operating modes (e.g., normal drilling, depth approach, skewed position correction) depending on the measured distance values and calculated borehole depth, enabling adaptability to varying drilling conditions without manual intervention
Solution Approach 2:
The system establishes closed-loop control where distance sensors continuously measure the distance between the power tool and workpiece, the control device calculates borehole depth and compares it with the target depth, and the power tool automatically adjusts its operation based on this feedback. This feedback mechanism enables the system to adapt to different drilling conditions by dynamically modifying drilling parameters
3Productivity
If the power tool drilling speed is increased to improve productivity, then the productivity increases, but the manufacturing precision of borehole depth decreases
Solution Approach 1:
The distance sensors continuously measure the distance between the power tool and workpiece throughout the drilling process, providing real-time data on borehole depth. This continuous measurement enables the system to maintain high drilling speeds while precisely tracking depth, as the feedback control can make immediate adjustments without interrupting the drilling action
Solution Approach 2:
The closed-loop feedback system continuously monitors borehole depth through distance measurements and automatically adjusts drilling parameters to maintain precision even at high speeds. The control device processes real-time distance data and modulates the drilling operation accordingly, ensuring that productivity gains do not compromise 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
This solution enhances the accuracy of borehole depth measurement and control, preventing skewed orientations of the power tool and allowing for precise adjustment of drilling parameters based on material characteristics and distance values.
Implementation Method 1
The at least one sensor of the acquisition apparatus can be based on a transit time measurement, for example an ultrasound measurement.
Implementation Method 2
The at least one sensor of the acquisition apparatus can be based on a transit time measurement, for example an ultrasound measurement.
Data Source
AI summary
Method for open-loop and closed-loop control of a power tool, wherein the power tool is connected to at least one acquisition apparatus, comprising the following method steps: acquisition of a first distance value by a sensor; inputting of at least one distance-of-travel value into the acquisition apparatus by an input device; adjustment of the power tool from a first operating mode having at least a first operating characteristic into a second operating mode having at least a second operating characteristic; acquisition of at least a second distance value within a predetermined period of time; transmission of at least one signal from the acquisition apparatus to the power tool in dependence on the acquired at least second distance value; and adjustment of the power tool from the second operating mode into a third operating mode having at least a third operating characteristic after a predetermined signal has been received.