Cartridge Spindle Rotary Joint Segmentation
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Solution Overview
Problem
Cartridge-type spindle devices with integrated rotary joints for through spindle coolant systems face challenges in smooth spindle removal due to the need for long draw bars or additional bearing support, complicating maintenance and repair.
Innovation Solution
A spindle device design featuring a separable structure with a draw bar, unclamp unit, and rotary joint placement in the draw bar driving piston, allowing for reduced rearward projection of the draw bar and simplified spindle separation from the rear housing, facilitated by a coolant passage and seal rings for easy tool clamping and coolant supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotary joint is applied to the cartridge-type spindle device, then through spindle coolant supply is enabled, but the spindle cannot be smoothly pulled off requiring long draw bar or additional support
Solution Approach 1:
The rotary joint is segmented into two separate parts: a fixed part attached to the rear housing and a movable part attached to the draw bar. This segmentation allows the movable part to move axially with the draw bar during removal, enabling smooth spindle extraction without requiring a long draw bar or additional support structures.
Solution Approach 2:
The rotary joint transitions from a static connection to a dynamic one where the movable part can shift axially. During normal operation, the seal rings maintain fluid-tight connection for coolant supply. During spindle removal, the movable part moves axially to disengage, enabling smooth extraction without compromising coolant supply reliability during machining.
2Reliability
If the rotary joint is arranged behind the unclamp device, then coolant supply is achieved, but the draw bar becomes long requiring separation structure
Solution Approach 1:
The movable part of the rotary joint is nested within the draw bar structure, with the coolant passage formed inside the draw bar. The seal rings are positioned to create a fluid-tight connection between the movable rotary joint part and the draw bar, allowing the coolant supply function to be integrated without extending the draw bar length.
Solution Approach 2:
The coolant supply path is redirected through the draw bar itself rather than requiring the rotary joint to be positioned behind the unclamp device. By forming the coolant passage within the draw bar and using axial movement of the movable rotary joint part, the system achieves coolant supply without increasing draw bar length or requiring additional separation structures.
3Ease of operation
If the draw bar is separated while being pulled off, then spindle removal is enabled, but the structure becomes complex
Solution Approach 1:
The movable part of the rotary joint automatically disengages from the fixed part through axial movement of the draw bar during spindle removal. The seal rings are positioned to allow this axial separation without requiring additional mechanisms, guides, or complex separation structures. The system uses its own axial movement capability to achieve the separation function.
Data Source
AI summary
The present invention provides a cartridge-type spindle device having an easily separable structure despite the fact that it comprises a rotary joint for a through spindle coolant device. In the cartridge replacement type spindle device (11), front bearings of the spindle are built in a front housing (23) and rear bearings of the spindle (15) are supported on a rear housing (25) so that, when the front housing (23) is separated from the rear housing (25), the front bearings (17a, 17b), the spindle (15), and the rear bearings (19a, 19b) can be separated from the rear housing (25) integrally with the front housing (23). The rotary joint is disposed in a piston (63) of an unclamp means for unclamping a tool (21, T) mounted to the forward end of the spindle (15), so that a draw bar (51) accompanied by a seal ring can be separated from the rear housing (25) and the rotary joint together with the spindle (15) and the front housing (23).