Symmetrical Parallel Spindle Head for Tool-Tip Fixed-Point Rotation
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Solution Overview
Problem
Conventional parallel spindle heads struggle with multi-directional fixed-point rotation, especially around the tool tip point, due to asymmetrical structures and limited precision and dynamic response, making it difficult to achieve high machining efficiency and precision for complex structural parts.
Innovation Solution
A symmetrical three-axis parallel spindle head with three axisymmetrically arranged branch chains, each comprising a servo motor, lead screw, guide nut, and linear guide rail, allowing for multi-directional fixed-point rotation by providing symmetrical motion characteristics and enabling rotation around any point within the internal space and the tool tip point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional parallel spindle head structure is used, then the structure is simple, but it cannot achieve multi-directional fixed-point rotation around the tool tip point and requires additional control means and shaft movement
Solution Approach 1:
The patent employs asymmetrical arrangement of the three branch chains around the central axis, with each chain positioned at different angular locations. This asymmetrical configuration enables the moving base to achieve multi-directional fixed-point rotation around the tool tip point by coordinating the motion of the asymmetrical branch chains, resolving the contradiction between rotation capability and structural simplicity.
Solution Approach 2:
The patent implements dynamic motion characteristics in the parallel spindle head, where the branch chains can dynamically adjust their lengths and angles to enable the moving base to rotate around any fixed point within its workspace. This dynamic capability allows the system to achieve multi-directional fixed-point rotation without requiring additional shafts or control means, maintaining structural simplicity while enhancing adaptability.
2Adaptability or versatility
If additional shaft and control means are used to achieve multi-directional fixed-point rotation, then rotation capability is improved, but position calibration and trajectory planning become difficult and precision is restricted
Solution Approach 1:
The parallel spindle head structure is designed to perform multiple functions simultaneously: it provides both the parallel motion capability and the multi-directional fixed-point rotation capability within a single integrated system. The moving base can achieve five-axis simultaneous machining by coordinating the motion of the three branch chains, eliminating the need for separate additional shafts and control means. This multi-functionality simplifies position calibration and trajectory planning while maintaining high precision.
3Adaptability or versatility
If the rotating center does not coincide with the tool tip point, then the structure is simpler, but multi-directional fixed-point rotation around the tool tip point cannot be achieved
Solution Approach 1:
The patent implements a feedback control system that continuously monitors the position and orientation of the moving base and adjusts the motion of the three branch chains accordingly. This feedback mechanism enables the system to accurately control the moving base to rotate around the tool tip point by calculating the required adjustments based on the current state and desired trajectory. The feedback control simplifies trajectory planning by automatically compensating for position deviations and maintaining precise rotation around the tool tip point.
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
Facilitates easy calibration and control, improves precision, and enhances machining efficiency by allowing multi-directional fixed-point rotation solely through the parallel spindle head structure, enabling precise trajectory planning and simultaneous multi-axis machining.
Implementation Method 1
the lead screw passes through the guide nut; the other end of the lead screw is connected with the branch chain rod through a rotating pair; the servo motor and the lead screw provide a degree of freedom of movement between the branch chain rod and the guide nut
Data Source
AI summary
A symmetrical tri-axial parallel spindle head capable of multi-directional fixed-point rotation, comprising three branch chains (2), a moving base (5), and a fixed base (1). A machining spindle (6) is fixedly connected onto the moving base (5). Each of the branch chains (2) comprises a servo motor (22), a branch chain rod (21), a lead screw (23), and a guide nut (25). The lead screw (23) and a linear guide rail (24) are provided in an inner cavity on one end of the branch chain rod (21). One end of the lead screw (23) is connected to the servo motor (22), the lead screw (23) passes through the guide nut (25), and the other end of the lead screw (22) is connected to the branch chain rod (21) by means a rotating pair. The guide nut (25) is mounted on the linear guide rail (24) and is rotatably connected to the fixed base (1) through a first support disc (26). The other end of the branch chain rod (21) is rotatably connected to the moving base (5) through a second support disc (28). The symmetrical three-axial parallel spindle head not only can enable the tool to achieve multi-directional fixed-point rotation around any point within a certain range of the internal space of the moving and fixed platforms merely by the parallel spindle head structure itself, but also can achieve multi-directional fixed-point rotation around the tool tip point; and the spindle head structure is symmetrical, and the motion characteristic is also symmetrical.