Pivoting Collet Chuck Offset Clamping Axes
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Solution Overview
Problem
Existing swivel chucks face challenges in accommodating large workpieces due to space constraints and machining errors caused by uneven clamping forces, which result in deformation or unusable sleeves, especially when trying to machine large-diameter sleeves with multiple clamping jaws.
Innovation Solution
A compact swivel chuck design with offset clamping axes and a synchronizing ring for radial movement of clamping jaws, allowing for a smaller chuck body diameter while maintaining the ability to accommodate large workpieces, achieved by integrating the drive components within the chuck body to reduce space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple clamping jaws are provided to clamp large-diameter sleeves, then the clamping capability is improved, but the chuck body diameter must be increased to accommodate the additional jaws, increasing installation space requirements
Solution Approach 1:
The synchronizing ring is nested within the chuck body, and the clamping jaws are mounted on the synchronizing ring. This nested arrangement allows multiple clamping jaws to be accommodated within a compact chuck body diameter of 400 mm, resolving the contradiction between clamping capability and installation space requirements
Solution Approach 2:
The clamping jaws are arranged radially around the chuck body rather than linearly, utilizing the circular dimension to accommodate multiple jaws within a compact diameter. This dimensional arrangement enables three or more clamping jaws to be positioned effectively without increasing the chuck body diameter
2Stability of the object's composition
If the lower clamping jaw is firmly supported in the chuck body to maintain stability, then the structural stability is improved, but the adjustability of the clamping jaw height is lost, making workpiece centering difficult
Solution Approach 1:
The lower clamping jaw is mounted on the movable synchronizing ring rather than being fixed to the chuck body. This dynamic mounting allows the jaw to move radially with the synchronizing ring during rotation, providing both stability during clamping and automatic adjustability for workpiece centering without requiring manual intervention
Solution Approach 2:
The synchronizing ring's radial movement automatically adjusts the position of the lower clamping jaw to accommodate workpieces of varying sizes. The system self-adjusts through the mechanical coupling between the synchronizing ring and the jaw, eliminating the need for manual height adjustment while maintaining structural stability
3Adaptability or versatility
If clamping jaws are positioned to accommodate large inner diameters of sleeves, then the adaptability to large workpieces is improved, but the machining forces perpendicular to the clamping direction cannot be optimally supported, causing the sleeve to be pushed out of central position
Solution Approach 1:
The clamping axes of the three clamping jaws are intentionally offset from the pivot axis of the swivel ring by approximately 30 degrees. This asymmetric arrangement creates optimal geometric relationships that enable the clamping jaws to effectively counteract machining forces perpendicular to the clamping direction, maintaining centering precision even when accommodating large-diameter workpieces
Solution Approach 2:
The offset positioning of each clamping jaw creates localized optimal clamping geometry for different regions of the workpiece. The asymmetric arrangement ensures that each jaw is positioned to effectively support forces in its specific directional zone, collectively maintaining overall centering precision for large workpieces
4Productivity
If the swivel ring is rotated 180 degrees to machine both ends of the sleeve, then the productivity is improved, but the toothed racks must be pulled back to starting position, causing downtime
Solution Approach 1:
The synchronizing ring enables continuous rotation of the chuck body through 180 degrees without requiring the toothed racks to be reset. The mechanical coupling between the synchronizing ring and the drive mechanism maintains continuous operational flow, eliminating downtime associated with rack repositioning and enabling uninterrupted machining operations
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 design reduces installation space by nearly 50% compared to prior art, allows for easier adjustment and reduced material costs, and minimizes machining downtimes by enabling continuous rotation of the swivel ring during machining.
Implementation Method 1
the radial infeed of the clamping jaws, which must take place synchronously in order to achieve a centric clamping of the sleeve, is achieved with the aid of a hydraulic circuit, through which a clamping piston assigned to each clamping jaw is moved axially in the swivel ring
Data Source
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AI summary
The invention relates to an indexing chuck (1), comprising a chuck body (2), in which an accommodating opening (3) is incorporated; comprising a pivoting ring (5) inserted in the accommodating opening (3) of the chuck body (2), on which pivoting ring at least three clamping jaws (6) that can be advanced radially perpendicularly to the longitudinal axis (4) of the chuck body (2) are supported; comprising an advancing device (8), which is inserted into the pivoting ring (5) and by means of which the clamping jaws (6) can be moved synchronously; comprising two pivot pins (11, 12), which are supported in the chuck body (2) and which form a pivot axis (13), wherein the advancing device (8) of the at least three clamping jaws (6) is formed by a synchronizing ring (33), which is supported so as to be movable parallel to the longitudinal axis (4) of the chuck body (2) in the pivoting ring (5), a driving surface (36) extending at an angle to the longitudinal axis (4) of the chuck body (2) is fastened to the synchronizing ring (33) in the region of the respective clamping jaw (6), and a contact surface (37) is provided on the respective clamping jaw (6), which contact surface interacts with the driving surface (36) of the synchronizing ring (33) in such a way that the clamping jaws (6) are moved radially out of the pivoting ring (5).