Main Shaft Holder Check-Valve Coupling for Hydraulic Leak Prevention
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Solution Overview
Problem
Existing machine tool systems face issues with hydraulic fluid leakage between the main shaft and holder, leading to contamination and reduced hydraulic power unit efficiency, as well as difficulties in installing and arranging piping for hydraulic fluid supply, which affects the accuracy and reliability of workpiece handling.
Innovation Solution
The implementation of check valves in the fluid passages between the main shaft and holder, along with a tapered fitting mechanism, to prevent hydraulic fluid leakage during attachment and detachment, and to eliminate the need for separate piping by allowing hydraulic fluid to be supplied through integrated passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If hydraulic fluid is supplied from the main shaft fluid passage through the holder fluid passage to automatically attach and detach workpieces, then automation and versatility are improved, but hydraulic fluid leaks from the fluid passages when the holder is detached, causing contamination and reducing reliability
Solution Approach 1:
A check valve is introduced as an intermediary component in the fluid passage to control the flow direction of hydraulic fluid. The check valve allows hydraulic fluid to flow from the main shaft fluid passage to the holder fluid passage during attachment, but prevents reverse flow during detachment, thereby eliminating leakage and contamination while maintaining automated operation.
Solution Approach 2:
The hydraulic fluid supply function is extracted from the traditional piping system and integrated into the holder's fluid passage. By providing a fluid passage directly within the holder that connects to the main shaft fluid passage, the system eliminates the need for separate external piping while enabling automated workpiece attachment and detachment.
2Ease of operation
If piping is installed to supply hydraulic fluid to the cylinder of the workpiece gripping base, then the gripping function is improved, but the piping becomes an obstacle and arrangement changes become troublesome, reducing ease of operation
Solution Approach 1:
The holder integrates multiple functions by combining the workpiece gripping mechanism, the cylinder for actuation, and the hydraulic fluid passage into a single unified component. This merging eliminates the need for separate piping to supply hydraulic fluid to the cylinder, as the fluid passage is already incorporated within the holder structure, thereby simplifying the overall system and improving arrangement flexibility.
Solution Approach 2:
The holder is designed as a multi-functional component that simultaneously performs workpiece gripping, hydraulic fluid transmission, and structural support. By making the holder universal in its functions, the system eliminates the need for additional dedicated piping for hydraulic supply, reducing device complexity while maintaining full gripping capability.
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
Prevents hydraulic fluid leakage, reduces contamination, and maintains hydraulic pressure, enhancing the accuracy and reliability of workpiece handling and machining operations by ensuring a consistent supply of hydraulic fluid without the need for additional piping.
Implementation Method 1
a main shaft check valve (hereinafter, referred to as a main shaft check valve A) is provided in the main shaft fluid passage A, a holder check valve (hereinafter, referred to as a holder check valve A) is provided in the holder fluid passage A
Implementation Method 2
a joining end portion of the holder is tapered to narrow toward a tip end so as to be joined to a fitting recess portion of the spindle that has an inner surface tapered to become wider toward a tip end
Data Source
AI summary
[Object] To provide a main-shaft and holder combination, a holder, and a machine tool which prevent a hydraulic fluid from leaking when the holder is detached from the main shaft, in a configuration for feeding the hydraulic fluid from the main shaft to the holder.[Solution Means] A main shaft fluid passage A30 is provided at a center of a spindle 25 and a main shaft check valve A11 is attached, and a holder fluid passage A32 is provided at a center of a holder 22 and a holder check valve A17 is attached. At a main shaft cylinder 23 position away from the spindle 25, a main shaft fluid passage B11 and a holder fluid passage B48 are provided, and a main shaft check valve B39 and a holder check valve B40 are attached. When the holder 25 is attached to the spindle 25, the main shaft check valve A11 (B39) and the holder check valve A17 (B40) are connected.