Coaxial Tool Holder Layout for Balanced Reverse Turning
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Solution Overview
Problem
Existing reverse turning machines face limitations in precision and flexibility due to the eccentric arrangement of motors around the workpiece, leading to moment of inertia, unbalance, and restricted tool number, which hampers high-speed machining of hard materials like metal with high precision.
Innovation Solution
A tool holder design where motors are coaxially aligned with the workpiece axis, allowing independent control of tool plunge depths and distributing mass uniformly, along with brushless motors and wireless control signals to mitigate inertia and imbalance, enabling precise and flexible machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If motors are arranged eccentrically around the workpiece axis, then tool positioning flexibility is improved, but moment of inertia increases and unbalance occurs
Solution Approach 1:
The patent transitions from radial motor arrangement (in the plane perpendicular to workpiece axis) to axial motor arrangement (along the workpiece axis). This dimensional change allows motors to be positioned coaxially with the workpiece, reducing the radial distance from the rotation axis and thereby minimizing the moment of inertia while preserving tool positioning capability through electronic control.
Solution Approach 2:
The patent replaces the mechanical cam-based tool positioning system with an electronically controlled motor system. Servomotors or stepper motors positioned coaxially control tool depth and position through electronic signals, eliminating the need for eccentric mechanical arrangements while maintaining positioning flexibility.
2Adaptability or versatility
If motors are arranged eccentrically around the workpiece axis, then tool positioning flexibility is improved, but unbalance and vibration increase
Solution Approach 1:
By repositioning motors from an eccentric radial arrangement to a coaxial axial arrangement, the patent eliminates the unbalance caused by asymmetric mass distribution. The motors are now symmetrically positioned along the rotation axis, ensuring balanced mass distribution while electronic control maintains positioning flexibility.
Solution Approach 2:
The patent replaces the mechanical cam system that caused unbalance with an electronically controlled motor system. The servomotors or stepper motors, positioned coaxially, provide precise tool positioning through electronic control without creating mechanical unbalance or vibration.
3Productivity
If multiple tools are added to increase manufacturing capability, then productivity is improved, but device complexity and imbalance increase
Solution Approach 1:
The patent implements a universal tool holder design that can accommodate multiple tools (typically 2-4 tools) positioned at different angular locations around the workpiece. Each tool is independently controlled by its own motor, allowing the system to perform multiple machining operations simultaneously or sequentially, thereby increasing productivity without proportionally increasing complexity.
Solution Approach 2:
The patent replaces the mechanical cam system with an electronically controlled multi-motor system. Each tool is controlled by an independent servomotor or stepper motor, allowing precise independent positioning of multiple tools. This electronic control architecture manages the complexity of multiple tools more efficiently than mechanical linkages.
4Device complexity
If cam control system is used, then machine structure is simple, but configuration flexibility is limited
Solution Approach 1:
The patent replaces the mechanical cam control system with an electronically controlled motor system. Servomotors or stepper motors, controlled by digital signals from a CNC controller, replace the physical cams. This substitution maintains relatively simple machine structure while dramatically increasing configuration flexibility, as tool paths and positions can be programmed and modified through software without mechanical reconfiguration.
Solution Approach 2:
The patent introduces dynamic, programmable control through servomotors and CNC programming, replacing the static, fixed geometry of cam systems. The electronic control system allows dynamic adjustment of tool positions, speeds, and paths, providing adaptability for different workpieces and machining operations while maintaining a simple underlying mechanical structure.
Data Source
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AI summary
Tool holder for turning material (2) by means of at least one tool (17a, 17b, 17d, 17d) rotating around the material, said tool holder incorporating at least one motor (16a, 16b, 16c, 16d) for controlling the plunge depth of said tool, said motor(s) comprising a rotor (160b). The motor(s) are provided with a longitudinal opening for the passage of material through the motor(s).