Complex Lathe Spindle Angle Correction via Two-Speed Contact Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for detecting the position and posture of a workpiece in a tool machine using a detection jig struggle to set an optimal contact speed, balancing detection accuracy and productivity, especially in complex lathes performing drilling or planar processing, where the spindle rotation angle needs to be accurately detected.
Innovation Solution
A method involving two contact speeds is implemented, where a first speed is set for initial contact and a second, slower speed for accurate detection, allowing for precise spindle angle correction, with a device comprising a tool post movement member, spindle rotation member, contact detection member, and correction value calculation unit to manage the contact operations and calculate correction values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the contact speed is set to a slow speed to improve detection accuracy, then the detection accuracy is improved, but the productivity is degraded due to increased detection time
Solution Approach 1:
The contact operation is divided into two distinct phases: a first contact operation at a first speed and a second contact operation at a second speed. This segmentation allows each phase to be optimized for its specific purpose, resolving the contradiction between speed and accuracy
Solution Approach 2:
The contact speed is made dynamic rather than static, with the system automatically switching between a first speed and a second speed based on the detection phase. This dynamic adjustment allows the system to achieve both high accuracy and high productivity
2Productivity
If the contact speed is set to a fast speed to improve productivity, then the productivity is improved, but the detection accuracy becomes degraded and impact sound becomes louder
Solution Approach 1:
The contact operation is divided into two distinct phases: a first contact operation at a first speed and a second contact operation at a second speed. This segmentation allows each phase to be optimized for its specific purpose, resolving the contradiction between speed and accuracy
Solution Approach 2:
The contact speed is made dynamic rather than static, with the system automatically switching between a first speed and a second speed based on the detection phase. This dynamic adjustment allows the system to achieve both high accuracy and high productivity
3Productivity
If the contact speed is set to a fast speed to improve productivity, then the productivity is improved, but the impact sound becomes louder causing damage to the work or machine
Solution Approach 1:
The contact operation is divided into two distinct phases: a first contact operation at a first speed and a second contact operation at a second speed. This segmentation allows each phase to be optimized for its specific purpose, resolving the contradiction between speed and accuracy
Solution Approach 2:
The contact speed is made dynamic rather than static, with the system automatically switching between a first speed and a second speed based on the detection phase. This dynamic adjustment allows the system to achieve both high accuracy and high productivity
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 approach allows for high detection accuracy while reducing detection time, enabling efficient processing with adjustable contact speeds to suit various workpiece shapes and machine configurations, improving productivity and accuracy.
Implementation Method 1
An increase in load of the motor can be detected by an increase in current value of the motor
Implementation Method 2
when the tool machine is an NC tool machine, the contact between the detection jig and the work can be detected with higher accuracy by detecting an increase in position deviation which is a difference signal between a tool post position instruction given to the motor and a feedback signal returned from the motor
Data Source
Figure 1
Figure 2~4
Figure 5
AI summary
[Object] In a technique of detecting a dimension or a posture of a work by bringing a rigid member (a detection jig) having a simple shape into contact with a work loaded into a tool machine and processing the work in accordance with a detection result, it is designed to more appropriately set a contact speed depending on a case where detection accuracy for a dimension or a posture of the work is important or productivity is important. [Solving Means] A first speed and a second speed slower than the first speed are set as a contact speed when a work w and a detection jig t attached to a tool post are brought into contact with each other to detect a position or a posture of the work w, the work and the detection jig are brought into contact with each other at the first speed, the detection jig and the work contacting each other are separated from each other by a predetermined distance, the work and the detection jig which are separated from each other are brought into contact with each other at the same position at the second speed, and a correction value δ is obtained based on a tool post position or a spindle angle during the second contact.