Adjustable Tool Head for Multi-Stage Cylinder Surface Machining
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Solution Overview
Problem
Existing methods for machining the inner surfaces of cylinders in internal combustion engines are dependent on the quality of the casting and require significant investment, energy, and resources, while also facing challenges in ensuring the long-term reliability of the coating.
Innovation Solution
A tool head with at least one adjustable tool and a second tool, arranged circumferentially, allows for controlled machining of the cylinder surface by altering the radial position and engagement sequence of the tools relative to each other, enabling machining in multiple stages without the need for additional drives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-pressure water-jet technology is used to roughen the cylinder running surfaces, then the coating adhesion is improved, but the process requires significant investment, energy and resources
Solution Approach 1:
The patent replaces the high-pressure water-jet mechanical system with a mechanically simple tool head that uses cutting tools to directly machine the cylinder surface. This substitution eliminates the need for complex high-pressure fluid systems, reducing energy consumption while maintaining surface preparation quality for coating adhesion.
Solution Approach 2:
The invention extracts and eliminates the high-pressure water-jet system from the process, replacing it with a self-contained mechanical tool head that performs both roughening and groove formation in one integrated unit, thereby removing the energy-intensive external system while preserving the essential surface preparation function.
2Ease of manufacture
If mechanical machining of the cylinder wall is applied to create grooves for coating grip, then some disadvantages of water-jet technology are eliminated, but it is difficult to ensure reliable coating longevity over the entire service life
Solution Approach 1:
The patent merges multiple functions (roughening, groove formation, and surface structuring) into a single integrated tool head that performs all operations simultaneously during one machining pass. This combination ensures consistent geometric parameters for coating grip while maintaining manufacturing simplicity, thereby achieving both ease of manufacture and reliable coating longevity.
Solution Approach 2:
The tool head incorporates adjustable tools that can be radially positioned to control engagement depth and sequence. This dynamic adjustability allows optimization of groove geometry and depth to ensure reliable coating adhesion throughout the service life, while maintaining the simplicity of a single-machining-operation process.
3Productivity
If multiple tools are arranged circumferentially on the tool head, then machining in multiple stages is enabled with only one tool head, but the device complexity increases
Solution Approach 1:
The tool head is designed as a universal multi-functional device where multiple tools perform different machining stages (roughening, groove formation, finishing) in sequence during a single pass. This multi-functionality achieves high productivity by eliminating the need for multiple separate tool heads or machining operations, while the modular tool arrangement keeps the overall device complexity manageable.
Solution Approach 2:
The tool head segments the machining process into distinct functional zones with multiple tools arranged circumferentially, each performing a specific machining stage. This segmentation enables efficient multi-stage machining in one operation while maintaining a relatively simple overall structure through modular tool mounting and independent adjustment mechanisms.
4Device complexity
If the adjustable tool is supported on a cone with axial movement capability, then radial position adjustment is achieved in a structurally simple manner, but the adjustment precision may be limited by play in the axial direction
Solution Approach 1:
The conical support structure utilizes the axial movement of the tool head during insertion and withdrawal to automatically adjust the radial position of the tools. The play in axial direction, rather than being a defect, becomes a feature that enables self-adjustment of radial engagement depth, achieving position control without complex adjustment mechanisms while maintaining sufficient precision for the application.
Data Source
AI summary
A tool head includes a first tool and a second tool disposed circumferentially on the tool head where the tool head has a rotation axis. The first tool of the tool head is an adjustable tool that is radially movable such that a radial position, relative to the second tool of the tool head, is settable.