Threaded Machining Fixture for Clamp-Free Precision Turning
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Solution Overview
Problem
Conventional clamping methods, such as using chuck jaws, apply undesirable forces to blank parts during machining, leading to quality issues like roundness and flatness problems, and obstruct access to portions of the part that need to be machined.
Innovation Solution
A machining fixture with a flat annular surface that secures the blank part using threaded fasteners, allowing unobstructed machining of inner, outer, and lower surfaces without the need for clamps, ensuring even pressure distribution and maintaining the part's natural state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chuck jaws or clamps are used to hold the blank part during machining, then the blank part is secured and prevented from being expelled, but the clamps exert enormous pressure on the outer and inner surfaces causing the part to go out of round resulting in quality issues
Solution Approach 1:
The invention extracts the harmful clamping function from the holding system. Instead of using traditional chuck jaws that contact and deform the part, the patent uses a fixture with threaded openings that allow the part to be secured through its own structure, eliminating the need for external clamps that exert deforming pressure on the blank part surfaces.
Solution Approach 2:
The fixture body acts as an intermediary between the machining apparatus and the blank part. Rather than clamps directly contacting and deforming the part, the fixture provides a flat reference surface and threading structure that mediates the securing process, allowing the part to be held without direct clamping pressure on its outer or inner surfaces.
2Reliability
If chuck jaws or clamps are used to hold the blank part, then the part is secured during machining, but the clamps block significant areas of the part preventing unobstructed machining access
Solution Approach 1:
The invention removes the physical obstruction of traditional clamps from the machining area. By using threaded openings in the fixture rather than external clamps, the system eliminates the blocking elements that prevent access to the blank part surfaces, allowing machining tools to reach all areas including the inner surface without obstruction.
3Reliability
If traditional clamping methods are used, then the blank part is held securely, but the transmitted forces cause stress resulting in roundness and flatness issues decreasing milling and cutting quality
Solution Approach 1:
The fixture body serves as an intermediary that distributes securing forces uniformly through the blank part's structure rather than concentrating clamping pressure on specific surfaces. The threaded openings and flat reference surface create a distributed force system that maintains the part's natural geometry while providing secure holding during machining operations.
Data Source
AI summary
A machining fixture configured to secure a blank part having part inner and outer circumferential surfaces, a part first axial face opposing a part second axial face, and at least two threaded part openings extending inwardly from the part second axial face and toward the first axial face. The machining fixture includes an annular body sized to be disposable upon a pallet of a machine table and has an upper surface including a substantially flat annular surface section, opposing lower surface and at least two through-holes extending between the upper and lower surfaces. At least two fasteners are disposed at least partially within a separate one of the at least two through-holes such that the at least two fasteners project upwardly from the upper surface, and the at least two fasteners are configured to threadedly engage a separate one of the at least two part openings to removably clamp the part second face against the body flat surface section.