Cylinder Bore Machining with Load-Based Shape Inversion
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Solution Overview
Problem
The existing round hole machining methods for cylinder blocks in engines face challenges in maintaining machining accuracy due to varying machining loads caused by edge tool wear, leading to increased costs and cycle times.
Innovation Solution
A method and device that acquire machining load data to predict the machining shape, allowing for the inversion of the predicted shape to correct for elastic deformations, enabling accurate machining regardless of edge tool wear, and reducing the frequency of tool replacement and cycle time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the machining load is increased to improve machining efficiency, then productivity is improved, but machining accuracy is lowered due to elastic deformation of the work
Solution Approach 1:
The system performs preliminary measurement of the workpiece shape before machining, predicts the elastic deformation that will occur during machining based on the machining load, and pre-compensates for this deformation by adjusting the machining path. This preliminary action allows the system to maintain high machining accuracy even when using high machining loads for improved productivity.
Solution Approach 2:
The system implements a feedback loop where the actual workpiece shape is measured before machining, this measurement feedback is used to predict deformation, and the predicted deformation is then used to adjust the machining parameters. This closed-loop feedback system enables the maintenance of machining accuracy while allowing flexible adjustment of machining load for productivity optimization.
2Manufacturing precision
If the edge tool is replaced frequently to maintain machining accuracy, then machining accuracy is maintained, but cost and cycle time increase
Solution Approach 1:
The system performs preliminary measurement and prediction of elastic deformation before machining, allowing it to compensate for tool wear effects through software correction rather than physical tool replacement. This preliminary computational action extends tool life while maintaining accuracy.
Solution Approach 2:
The system changes the machining parameters dynamically based on measured workpiece geometry and predicted deformation, adjusting cutting paths and depths to account for tool wear. This parameter adaptation allows continued use of worn tools while maintaining machining accuracy, reducing tool replacement frequency.
3Manufacturing precision
If the allowance for cutting is reduced to decrease machining load, then machining accuracy is improved, but other steps are affected and cycle time increases
Solution Approach 1:
The system performs preliminary measurement and deformation prediction, enabling it to use larger cutting allowances while compensating for the resulting elastic deformation through computational correction. This preliminary computational compensation allows aggressive material removal without sacrificing final accuracy.
Solution Approach 2:
The system replaces the mechanical approach of using small allowances to prevent deformation with a computational approach that predicts and compensates for deformation. This substitution of computational correction for mechanical constraint allows larger allowances and faster machining while maintaining accuracy.
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 ensures accurate round hole machining regardless of edge tool wear, reduces tool replacement frequency, and minimizes the need for reduced cutting allowances, thereby enhancing productivity.
Implementation Method 1
When a pressing force (hereinafter referred to as a machining load) produced by the edge tool is increased, the work is elastically deformed
Data Source
AI summary
A round hole machining method and a round-hole machining device in which machining can be accurately performed regardless of the wear of an edge tool. A non-round hole machining device includes: a machining load data acquisition section for obtaining machining load data corresponding to a machining load acting on the cutting edge of a cutting tool when boring a bore in a cylinder block; a machined shape prediction section for predicting a machined shape of the workpiece by utilizing the obtained machining load data and elastic deformation amounts at respective positions on the workpiece; and a motor control section for machining the workpiece so as to form an inverted shape, that is, a shape formed by inverting the predicted machined shape with respect to a target shape.