Rotating Scribing Tools for Curved Multi-Layered Glass Cutting
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Solution Overview
Problem
Existing machines are unable to efficiently cut multi-layered glass sheets along curved lines with high precision and quality, and require complex and costly mechanisms to perform cuts other than straight lines, limiting the versatility and efficiency of cutting operations.
Innovation Solution
A machine with scribing tools that can rotate freely about a vertical axis and a mobile sheet movement system, allowing the tools to orient tangentially along any desired path, including curved lines, without repositioning the sheet, using a combination of motor-controlled slides and grippers for precise cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed bridge with complex structure is used for cutting multi-layered glass sheets, then cutting operations can be performed, but the machine can only cut along straight lines and requires sheet repositioning for curved cuts
Solution Approach 1:
The scribing tool assembly is made dynamically rotatable about a vertical axis, allowing the cutting direction to change continuously during operation. This dynamic capability enables curved and oblique cuts without repositioning the sheet, resolving the contradiction between cutting versatility and device complexity by adding only one rotational degree of freedom to the existing linear movement system
Solution Approach 2:
The machine is designed to perform multiple cutting functions (rectilinear, oblique, and curvilinear cuts) using a single fixed bridge structure. The scribing tool can execute any predetermined path by combining linear movement along the bridge with rotation about the vertical axis, eliminating the need for separate mechanisms for different cut types and achieving multi-functionality without proportionally increasing complexity
2Manufacturing precision
If the scribing wheel orientation is fixed, then the machine structure is simple, but curvilinear cuts cannot be performed with high precision
Solution Approach 1:
The scribing wheel assembly incorporates rotational freedom about the vertical axis, allowing the wheel orientation to dynamically adjust to the tangent of the desired cutting path. This enables precise curvilinear scribing by maintaining the wheel perpendicular to the instantaneous cutting direction, achieving high scribing precision without complex active orientation control mechanisms
Solution Approach 2:
The scribing tool automatically orients itself tangentially to the cutting path through its rotational degree of freedom. The tool's ability to rotate freely about the vertical axis allows it to self-adjust its orientation according to the path geometry, eliminating the need for complex external orientation control systems while maintaining high precision
3Productivity
If sheet repositioning is required for different cuts, then the machine structure is simple, but machining time increases significantly
Solution Approach 1:
The scribing tool assembly rotates about a vertical axis during the cutting operation, allowing the cutting direction to change continuously without stopping to reposition the sheet. This dynamic capability enables multi-side and curved cuts in a single setup, eliminating repositioning time and significantly improving productivity
Solution Approach 2:
The machine maintains continuous cutting action by allowing the scribing tool to rotate and cut along different directions without interrupting the process for sheet repositioning. The cutting operation proceeds continuously along the predetermined path, whether rectilinear or curvilinear, eliminating idle time associated with sheet handling and repositioning
Data Source
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AI summary
A machine for performing cutting operations on multi-layered glass sheets (L) comprises a fixed work bench (1), defining a resting surface (2) that is to receive the sheet (L) to be machined, and a fixed cutting bridge (6), mounted on which are a top scribing tool (8) and a bottom scribing tool (7), which are mobile along the cutting bridge (6) in a direction Y. A mobile bridge (21, 23) is provided on the bench, having members (22, 26) for gripping the sheet so as to move the sheet (L) on the fixed bench (2) in a horizontal direction X orthogonal to the aforesaid direction Y. Electronic control means (PC) are programmed for controlling during the operation of scoring of the glass sheet (L) a movement in the direction X of the sheet (L) and a movement in the direction Y of the tools (8, 7) co-ordinated with one another in such a way as to obtain a score according to any predetermined path (T) in the plane of the sheet (L), with rectilinear and/or curved stretches, without imparting a rotation upon the sheet during the scoring operation. Both the top tool (8) and the bottom tool (7) are mounted so that they can turn about an axis Z orthogonal to the direction X and to the direction Y, so as to remain tangential to the scribing path during the scoring operation.