Numerical Control for Vibration Cutting Depth Accuracy
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Solution Overview
Problem
Existing numerical control devices face accuracy issues when the machining direction and vibrating direction are not the same, leading to excessive cutting and degradation in machining accuracy due to a fixed vibrating direction.
Innovation Solution
A numerical control device that includes a matching determining unit to compare the vibrating direction and cutting direction, a comparison unit to assess the cutting depth, and an adjustment unit to adjust the tool's movement to ensure the actual cutting depth does not exceed the command value, thereby maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed vibrating direction is used to reduce processing load, then processing load is reduced, but machining accuracy degrades when machining direction and vibrating direction are not the same
Solution Approach 1:
The patent applies dynamics by making the vibrating direction adjustable rather than fixed. The vibration control unit can change the vibrating direction according to the machining direction, allowing the system to adapt dynamically to different machining scenarios. This resolves the contradiction by enabling the system to maintain low processing load while avoiding excessive cutting when directions don't align.
Solution Approach 2:
The patent changes the parameter of vibrating direction from a fixed value to a variable that can be adjusted based on machining conditions. By modifying this parameter dynamically, the system can optimize both processing load and machining accuracy for different machining directions without requiring complex additional hardware.
2Device complexity
If the vibrating direction is fixed regardless of cutting direction, then device complexity is reduced, but the actual cutting depth exceeds the command value causing accuracy degradation
Solution Approach 1:
The patent makes the single vibration mechanism universal by enabling it to function effectively for any machining direction. The vibration control unit adjusts the vibrating direction to match the machining direction, allowing the same device to maintain cutting depth accuracy across different machining scenarios without adding multiple specialized vibration mechanisms.
Solution Approach 2:
The patent implements feedback by having the vibration control unit continuously monitor the relationship between machining direction and vibrating direction, then adjust the vibration parameters accordingly. This feedback mechanism ensures that the actual cutting depth matches the command value even when machining conditions change, preventing accuracy degradation.
Data Source
AI summary
A numerical control device for controlling a plurality of drive shafts to drive a tool and cause the tool to cut a workpiece while vibrating the tool in a fixed vibrating direction regardless of a cutting direction, a comparison unit that compares a command value of a cutting depth with an actual value of the cutting depth based on a vibration amplitude of the drive shaft when the vibrating direction and the cutting direction are not the same as each other, the cutting depth being a difference between a position of a face to be machined of the workpiece before machining and a position of the machined face after machining; and an adjustment unit that adjusts a movement of the tool so that the actual value becomes smaller when the actual value is larger than the command value.