Dual Spindle Workpiece Machining Fixture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The manufacturing process of cast wheels is bottlenecked by the slow and inefficient machining of lug nut apertures and valve stem apertures, requiring multiple tool changes and rotations, which increases cycle time and manufacturing costs.
Innovation Solution
A spindle assembly with two opposing spindles and a fixture that allows simultaneous cutting of opposite sides of a workpiece by two cutting tools, reducing the need for multiple tool changes and rotations, and enabling a single tool change for different aperture configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single spindle with one cutting tool is used to machine all features, then the device complexity is low, but the productivity is reduced due to multiple tool changes and rotations
Solution Approach 1:
The patent combines two spindles into a single machining center, allowing simultaneous machining operations on opposite sides of the workpiece. This merging of functions increases productivity by eliminating sequential operations while the integrated design keeps overall system complexity manageable
Solution Approach 2:
The patent transitions from a single-axis vertical spindle to a dual-axis configuration with opposing spindles, adding dimensional capability to the machining system. This allows simultaneous access to opposite sides of the workpiece, fundamentally changing the machining approach from sequential to parallel operations
2Loss of energy
If the spindle axis is vertical, then the device complexity is low, but the chip flow becomes poor due to gravity not assisting chip removal
Solution Approach 1:
The patent inverts the traditional vertical spindle orientation by using horizontal spindle axes. This inversion allows gravity to assist chip flow away from the cutting zone, improving chip evacuation efficiency without requiring complex additional chip removal systems
3Loss of time
If multiple tool changes are performed to machine different features, then the manufacturing precision can be maintained, but the loss of time increases due to repeated tool changes and workpiece rotations
Solution Approach 1:
The patent enables continuous machining operations by having two spindles work simultaneously on opposite sides of the workpiece. This eliminates idle time during tool changes and workpiece rotations, maintaining continuous productive action throughout the machining cycle
Solution Approach 2:
The patent performs preliminary positioning and setup of the workpiece on the fixture, which then automatically indexes to predetermined positions for machining. This preliminary action eliminates the need for repeated manual positioning and tool changes, reducing cycle time while maintaining precision
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
This configuration reduces machining time by up to 50% and streamlines the manufacturing process by allowing simultaneous cutting of opposing sides of a workpiece, eliminating the need for redundant tool changes and rotations.
Implementation Method 1
The spindle axis is substantially horizontal for improved gravity assisted chip flow out of the work zone
Data Source
AI summary
A spindle assembly for machining a cast workpiece includes a fixture that provides rotational movement to the workpiece around a fixture axis. A first spindle provides rotational movement to a cutting tool around a first spindle axis and a second spindle provides rotational movement to a second cutting tool around a second spindle axis. The first spindle axis and the second spindle axis are transverse to the fixture axis. The fixture is disposed between the first spindle and the second spindle. The pivotal movement of the fixture provides access to opposite sides of the workpiece to the first spindle and the second spindle enabling the cutting tools to simultaneously cut opposing sides of the workpiece. The first cutting tool and the second cutting tool are replaceable by a third cutting tool and a fourth cutting tool to cut an alternative or different aperture into the workpiece.