Tailstock Pressing Control for Fast Contact and Low Deformation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing machining apparatuses face challenges in accurately and efficiently pressing the tailstock against a workpiece without causing deformation or damage due to impact forces during the pressing process.
Innovation Solution
The machining apparatus employs a controlled method where the tailstock is initially moved towards the workpiece at a high speed, detects contact based on input changes to the actuator, reverses slightly, and then presses at a lower speed to minimize deformation, using a processor to manage the actuator's movement and force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tailstock is pressed against the workpiece at a high speed, then the pressing process is faster and productivity is improved, but the impact force causes workpiece deformation and manufacturing precision deteriorates
Solution Approach 1:
The pressing process is divided into multiple stages: a first pressing stage at first pressing speed, and a second pressing stage at second pressing speed. This segmentation allows the system to achieve both high productivity (through the initial fast pressing) and high manufacturing precision (through the subsequent slow pressing that eliminates deformation)
Solution Approach 2:
The pressing operation uses periodic action by alternating between different pressing speeds in different stages. The control device switches from a higher first pressing speed to a lower second pressing speed, creating a periodic variation in the pressing process that resolves the contradiction between speed and precision
2Manufacturing precision
If the tailstock is pressed at a control speed lower than the temporary pressing speed when current exceeds threshold, then workpiece deformation is reduced, but the pressing time increases and productivity decreases
Solution Approach 1:
The pressing process is segmented into two distinct stages with different speeds. The first stage uses high speed for quick initial contact, and the second stage uses low speed for precision pressing. This segmentation eliminates the need to choose between speed and precision, as both are achieved in different phases
Solution Approach 2:
The first pressing stage performs a preliminary action by quickly bringing the tailstock into contact with the workpiece and applying initial pressing force. This preliminary high-speed pressing reduces the overall time required, while the subsequent second stage refines the pressing to eliminate deformation
Data Source
AI summary
A machining apparatus includes a processor configured to control an actuator to move a tailstock in a first direction at a first speed, to detect a contact between the tailstock and a workpiece based on a change in an input amount to the actuator while the actuator is controlled to move the tailstock at the first speed, to control the actuator to stop moving the tailstock when the contact is detected, to control the actuator to move the tailstock by a first distance in a second direction, to control the actuator to move the tailstock in the first direction at a second speed lower than the first speed, and to control the actuator to stop moving the tailstock, when the input amount to the actuator becomes a value corresponding to the target pressing force while the actuator is controlled to move the tailstock at the second speed.