Vacuum Hold-Down System for Angled Surface Machining
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Solution Overview
Problem
Conventional three-axis machines struggle to work on angled surfaces without heavy tilt plates, and five-axis machines require custom fixturing for complex shapes, leading to high setup costs and inefficiencies.
Innovation Solution
A vacuum support system with height-adjustable bearing and angularly flexible hold-downs, enabled by a spindle-mounted locator and CNC control, allows for precise three-axis positioning of workpieces on both three-axis and five-axis machines, enabling angled processing without custom fixturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If heavy tilt plates are used on three-axis machines to enable angled surface processing, then the ability to work on angled surfaces is improved, but the setup cost and complexity increase significantly
Solution Approach 1:
The system divides the workpiece support into multiple independent vacuum hold-down points distributed across the workpiece bottom surface, replacing the single heavy tilt plate structure. Each hold-down point can be independently controlled and positioned, enabling angled surface processing through coordinated positioning of multiple light-weight components rather than one massive plate.
Solution Approach 2:
The vacuum hold-down system serves multiple functions: it secures the workpiece to the table, enables angled positioning through height-adjustable supports, and allows processing of various shapes and sizes without requiring different fixtures. The same system configuration can accommodate both flat and angled surfaces, as well as simple and complex geometries.
2Measurement precision
If custom fixturing is used on five-axis machines for complex shapes, then the precision of locating complex shaped workpieces is improved, but the manufacturing cost and setup time increase
Solution Approach 1:
The system uses the workpiece's own geometry to achieve precise positioning. The spindle-mounted probe automatically scans and identifies locators on the workpiece bottom surface, and the CNC controller automatically calculates and positions the vacuum hold-down points based on the scanned geometry. This self-servicing approach eliminates the need for manual measurement and custom fixture fabrication.
Solution Approach 2:
The system replaces manual measurement and custom mechanical fixturing with automated probe scanning and CNC-controlled positioning. The probe electronically captures workpiece geometry, and the computer numerically controls the placement of vacuum hold-down points, substituting mechanical setup operations with automated digital processes.
3Force
If mechanical clamps are used to secure sheet materials, then the hold down force is improved, but the ability to process edge areas is reduced due to obstruction
Solution Approach 1:
Instead of clamping from the top edge of the workpiece as in conventional mechanical clamping, the system applies hold-down force from the bottom surface through vacuum. This inverted approach allows the cutting tool to access the entire top surface and edges of the workpiece without obstruction, while still maintaining secure holding through suction from underneath.
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
Facilitates efficient processing of angled surfaces on three-axis machines and complex shapes on five-axis machines, reducing setup time and costs by allowing flexible adaptation of work holding devices, ensuring accurate and stable machining.
Implementation Method 1
work holding supports using vacuum attached to both the underside surface of a sheet type material and to the machine table surface are used to forcibly secure the material for processing
Data Source
AI summary
The support system and method enables exact and preferably machine assisted manual location and height placement of a vacuum operated hold down with rigid pre-set support on a conventional working table. A height adjustable jack screw support with angularly flexible hold down enables a holding support engaging the bottom of a work piece even where a lower surface of the work piece has an irregular shape due to the ability of the upper cup support to passively tilt to engage the work piece.