Machining Tab Attachment for Billet Holding
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Solution Overview
Problem
The existing 'picture framing' technique for holding components during machining is inefficient due to excess material waste, size limitations, and increased complexity and weight when multiple elements are used, leading to potential strength reduction and corrosion.
Innovation Solution
A method involving determining the outer dimensions of a component, selecting a billet with matching or larger dimensions, and attaching multiple tabs to rigidly fix the billet to a machining table, allowing for efficient machining without excess material and enabling the use of available stock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If picture framing technique is used to hold component during machining, then component can be securely held on machining table, but excess material is wasted to form frame
Solution Approach 1:
The frame is segmented into multiple removable tabs that are attached only at specific locations where clamps need to be positioned. Instead of creating a continuous frame around the entire component, tabs are placed selectively at clamp locations, reducing material waste while maintaining holding stability.
Solution Approach 2:
The frame structure is transformed into localized tabs at specific positions rather than a continuous frame. This local quality approach places material only where needed for clamping, eliminating excess material in areas where framing is not required.
2Reliability
If picture framing is used, then component can be held during machining, but technique is limited when stock size is insufficient for both component and frame
Solution Approach 1:
The frame is divided into separate tab elements that can be selectively positioned and attached. This segmentation allows the tabs to be placed on available stock regardless of overall stock dimensions, enabling adaptability to various stock sizes while maintaining holding capability.
Solution Approach 2:
Instead of requiring two-dimensional space for a continuous frame around the component, the solution uses discrete tabs that extend in a third dimension (perpendicular to the component surface). This dimensional change allows tabs to be attached to stock of various sizes without requiring sufficient perimeter material for a complete frame.
3Ease of manufacture
If multiple elements are used when stock is insufficient, then component can be machined, but weight and complexity increase
Solution Approach 1:
The tabs are pre-attached to the component before machining begins. This preliminary action of attaching tabs allows the component to be held as a single unit during machining, eliminating the need for complex assembly of multiple elements afterward while maintaining manufacturability.
Solution Approach 2:
The tabs serve as intermediary elements that provide clamping surfaces without requiring the component itself to be divided into multiple elements. The tabs act as mediators between the clamps and the component, enabling single-element machining while maintaining ease of manufacture.
4Adaptability or versatility
If multiple elements are assembled, then component can be formed from smaller stock, but strength is reduced due to joining
Solution Approach 1:
The holding function is extracted from the component material itself and placed onto separate tab elements. This extraction allows the component to remain as a single unitary structure without joining, preserving strength while enabling the use of smaller stock through the attached tabs.
Solution Approach 2:
The tabs serve as intermediary elements that provide the necessary holding surfaces without requiring the component to be divided or joined. The tabs mediate between the clamping requirements and the component integrity, allowing single-piece machining from smaller stock while maintaining component strength.
Data Source
AI summary
A method of holding a billet of material (70) to a machining table (106) includes determining a first set of outer dimensions of a component (72) to be machined. The billet of material (70) is selected in response to the first set of outer dimensions to have a second set of outer dimensions. Dimensions of the second set of outer dimensions are approximately equal to or greater than corresponding dimensions of the first set of outer dimensions. Multiple tabs (76) are attached to the billet of material (70). The tabs (76) are rigidly fixed to the machining table (106). A machining system (50) includes a controller (52) that determines a first set of outer dimensions of a component (72) to be machined. A tab-forming mechanism (54) generates multiple tabs (76) that are configured to be rigidly fixed to a machining table (106). An attachment mechanism (56) couples the tabs (76) to a billet of material (70), which has a second set of outer dimensions having the same relation to the first set of outer dimensions previously stated.