Auxiliary Spindle Unit for Small Grinding Worm Synchronization
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Solution Overview
Problem
Existing gear cutting machines are not designed to accommodate small, long grinding worms, leading to issues with positioning accuracy, rigidity, and speed compatibility, and existing solutions with movable counter bearings complicate tool exchange and synchronization.
Innovation Solution
A device with an auxiliary spindle unit that includes a motor spindle and a counter bearing, allowing the machining tool to be driven independently, with a mandrel for easy tool replacement and a hydraulic expansion mandrel for secure clamping, ensuring the tool axis is parallel to the work spindle axis, enhancing synchronization and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a permanently mounted drive spindle and removable counter bearing are used to support the machining tool at both ends, then the machining tool can be exchanged, but the positioning accuracy of the counter bearing and the rigidity of the tool head deteriorate
Solution Approach 1:
The patent inverts the conventional arrangement by making the drive spindle removable and the counter bearing permanently mounted. This allows the machining tool to be exchanged by removing the entire drive spindle assembly along with the tool, while the permanently mounted counter bearing maintains high positioning accuracy and rigidity in the tool head.
2Adaptability or versatility
If a gear cutting machine designed for large diameter grinding worms is used with small diameter grinding worms, then small module gears can be machined, but collisions with the workpiece occur and speed requirements are not met
Solution Approach 1:
The patent makes the drive spindle assembly dynamic and interchangeable, allowing the selection of different drive spindles with appropriate diameters and speed characteristics for different grinding worm sizes. This enables the machine to adapt to small diameter grinding worms without collisions while meeting speed requirements, and maintains versatility for large diameter grinding worms.
3Device complexity
If the work spindle directly drives the machining tool, then the structure is simple, but precise synchronization for generating machining is difficult to achieve
Solution Approach 1:
The patent introduces the drive spindle as an intermediary between the work spindle and the machining tool. The drive spindle, with its independently adjustable speed and rotation, serves as a mediator that enables precise synchronization for generating machining by providing the correct rotational relationship between the machining tool and workpiece, while keeping the overall structure relatively simple.
Data Source
AI summary
A device for machining a gear using a rotating machining tool. The device has a motor spindle having a drive motor and motor spindle shaft drivable by the drive motor for driving the machining tool. The device has an attachment structure for releasably attaching the device to a work spindle of a tool head. The attachment structure is configured so the tool axis is parallel to the work spindle axis when the device is attached to the work spindle. A device is further disclosed to connect a machining tool to a counter bearing in a simple manner. For this purpose, the counter bearing has a hollow shaft. A mandrel having first and second clamping regions are arranged at positions along the longitudinal axis of the mandrel. The mandrel is inserted through the hollow shaft along the tool axis into a longitudinal bore of the machining tool.