Non-rotating Ejecting Rod for Machine Tool Spindle Vibration
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Solution Overview
Problem
Conventional workpiece ejecting devices in machine tools experience vibration, noise, and bending deformation due to high-speed spindle rotation, leading to malfunction and inefficient ejection operations.
Innovation Solution
A workpiece ejecting device design that includes a non-rotating ejecting rod supported by a front bearing unit and a rear dual bearing unit, preventing rotation and ensuring linear movement independent of spindle rotation, with fluid passing openings for coolant or air supply to facilitate smooth ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ejecting rod is supported by the drawing tube and inner guide during high-speed spindle rotation, then the ejection operation can be performed, but the ejecting rod rotates eccentrically causing vibration, noise, and bending deformation
Solution Approach 1:
A bearing is introduced as an intermediary component between the ejecting rod and the drawing tube/inner guide structure. This bearing mediates the interaction by supporting the ejecting rod in a way that prevents it from rotating with the spindle, thereby eliminating vibration and eccentric movement while still allowing the ejection operation to function properly.
2Ease of operation
If the ejecting rod is rotated by the spindle during machining, then the ejection mechanism can operate, but frictional heat is generated causing malfunction
Solution Approach 1:
The bearing serves as a mediator that decouples the rotational motion of the spindle from the ejecting rod. By introducing this intermediate component, the ejecting rod can perform its linear ejection function without being subjected to the rotational friction that generates harmful heat, thus preventing malfunction.
3Productivity
If the ejecting rod moves forward and rearward during high-speed rotation, then workpiece ejection is achieved, but the rod may be caught between bearings causing malfunction
Solution Approach 1:
The bearing acts as an intermediary that provides a stable, low-friction interface for the ejecting rod's linear movement. This mediation ensures that the rod can move forward and rearward smoothly during high-speed operation without being caught or jammed between structural components, thereby maintaining reliable ejection functionality.
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 vibration, noise, and frictional heat, enhancing the durability and reliability of the ejection process by maintaining the ejecting rod in a stationary position during spindle rotation, thereby ensuring smooth and efficient workpiece ejection.
Implementation Method 1
the ejecting rod 20 produces vibration, noise and heat to thereby cause bending deformation of the ejecting rod 20
Implementation Method 2
the ejecting rod being axially formed at the inside thereof with a fluid passing opening
Data Source
AI summary
A workpiece ejecting device for a machine tool, in which the ejecting bar cannot be rotatably driven at the time of high velocity rotation of the spindle to thereby prevent occurrence of vibration, noise and frictional heat, and so that the workpiece can be ejected smoothly. The workpiece ejecting device comprises: a front bearing unit installed at an inner peripheral surface of a front end portion of the drawing tube; an ejecting cylinder located behind the chucking cylinder and installed directly on an axial line identical with that of the front bearing unit, and an ejecting rod, wherein the ejecting rod is provided at a center axis thereof with at least one fluid passing opening through which fluid for removing alien materials is supplied, and a front end of the ejecting rod is installed to be supported by the front bearing unit.