NC Thread Diameter Compensation for JIS Tolerance Classes
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Solution Overview
Problem
Existing helical tapping methods often result in threads that do not conform to required grades due to cutting tools being manufactured without reflecting compensation amounts for tolerance standards, necessitating adjustments in tool diameters and checks for machining diameters based on JIS standards.
Innovation Solution
A numerical control device with an instruction unit that sets compensation amounts for the effective diameter of a circle to be machined, based on standards and tolerance ratios, allowing for easy setting of outer, inner, or effective diameters during machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cutting tools are manufactured without reflecting compensation amounts for tolerance standards, then tool manufacturing is simplified and more flexible, but the resulting threads do not conform to required grades
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation amounts in a database before machining operations. The system retrieves appropriate compensation values based on tool diameter and tolerance class, automatically applying them during machining to ensure thread grade conformity without modifying tool manufacturing processes.
Solution Approach 2:
The patent changes parameters by dynamically adjusting compensation amounts based on tool diameter and tolerance class combinations. The system stores multiple compensation values in a database and selects the appropriate parameter set during machining, allowing flexible adaptation to different tool and tolerance requirements while maintaining precision.
2Manufacturing precision
If users manually adjust tool diameters and check compensation amounts based on JIS standards, then thread precision can be achieved, but the operation becomes complex and time-consuming
Solution Approach 1:
The patent implements self-service by enabling the machining system to automatically retrieve and apply compensation amounts from its database without requiring user intervention. The system autonomously selects appropriate compensation values based on tool diameter and tolerance class, eliminating manual calculation and checking while maintaining precision.
Solution Approach 2:
The patent uses feedback by systematically storing and retrieving compensation data based on specific tool diameter and tolerance class combinations. The system automatically queries the database for the appropriate compensation amount and applies it during machining, creating a closed-loop process that ensures precision without manual intervention.
3Loss of time
If compensation amounts are not pre-calculated and stored, then data storage requirements are reduced, but setting compensation for each machining operation becomes time-consuming
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation amounts in a database before actual machining operations. This allows the system to quickly retrieve pre-computed values during machining, significantly reducing setup time while accepting the trade-off of requiring database storage capacity.
Data Source
AI summary
Provided is a numerical value control device capable of easily setting an effective diameter for a machined circle. The numerical value control device is equipped with a command unit which prescribes a machined circle standard or a proportion of the tolerance class to the machined circle tolerance in a machining program for machining a circle using a machine tool, and also equipped with a setting unit for setting a correction amount for the effective diameter of the machined circle on the basis of the machined circle standard or the proportion of the tolerance class to the machined circle tolerance.