Wheel Fixture With Centrifugal Clamping Compensation
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Solution Overview
Problem
Existing wheel machining fixtures face challenges in efficiently accommodating different wheel sizes due to limited travel constraints, leading to increased production time and labor intensity, and suffer from reduced clamping force at higher rotational speeds.
Innovation Solution
A wheel fixture with an adjustable stepped clamping jaw and centrifugal force compensation mechanism, utilizing high-strength aluminum alloy and CrMo materials, allows adaptation to multiple wheel sizes and maintains clamping force at high speeds through a balanced deflection block and guide shaft system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed fixture is used for wheel machining, then the machining precision is maintained, but the productivity decreases due to frequent fixture replacement when wheel sizes change
Solution Approach 1:
The fixture is designed with an adjustable positioning pull rod mechanism that can be repositioned along the wheel radius direction to accommodate different wheel sizes (13-22 inches). The positioning pull rod can be adjusted to different positions using positioning holes and locking mechanisms, allowing a single fixture to universally machine wheels of various diameters without requiring multiple dedicated fixtures, thereby improving productivity while maintaining reasonable device complexity
Solution Approach 2:
The fixture incorporates dynamic adjustment capabilities through the positioning pull rod system that can be moved and locked at different positions. This dynamic positioning system allows the fixture to adapt to different wheel sizes during operation, enabling quick size changes without complete fixture replacement, thus resolving the contradiction between productivity and device complexity
2Productivity
If the rotational speed is increased to improve productivity, then the production efficiency increases, but the clamping force decreases due to centrifugal force
Solution Approach 1:
The fixture employs a balance block mechanism that generates a counterbalancing force opposite to the centrifugal force acting on the clamping jaw during high-speed rotation. The balance block is positioned and weighted to compensate for the outward centrifugal force, maintaining the clamping force on the wheel even at high rotational speeds, thus enabling increased productivity without sacrificing clamping effectiveness
Solution Approach 2:
The fixture design changes the physical parameters of the clamping system by introducing the balance block with specific mass and position. This parameter modification allows the system to maintain adequate clamping force across a range of rotational speeds, enabling the operation to run at higher speeds for improved productivity while compensating for the centrifugal force effect through the balanced mass distribution
3Adaptability or versatility
If the travel of the chuck is limited to maintain device simplicity, then the device complexity is reduced, but the adaptability decreases when machining wheels of different sizes
Solution Approach 1:
The positioning system is segmented into multiple independent positioning pull rods that can be individually adjusted and locked at different positions along the wheel radius. Each positioning pull rod can be independently positioned using a series of positioning holes, allowing the fixture to accommodate different wheel sizes without requiring complex overall restructuring, thus improving adaptability while maintaining relatively simple device complexity
Solution Approach 2:
The positioning pull rods are designed to be nested within the chuck body structure, with each positioning pull rod containing multiple positioning holes that can be selected based on the wheel size. This nested configuration allows the positioning mechanism to be compactly integrated into the existing fixture structure, providing size adaptability without significantly increasing device complexity
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
The solution enhances production efficiency by accommodating multiple wheel sizes with reduced weight and labor, while ensuring reliable and flexible machining with maintained clamping force across varying rotational speeds.
Implementation Method 1
The maximum clamping force that the fixture can provide will be partially lost with the gradual increase of the rotational speed. The design of a suitable centrifugal force compensation mechanism can ensure the safety and reliability of the machining.
Implementation Method 2
The spring is arranged in a bottom hole of the balance block
Data Source
AI summary
A wheel fixture is disclosed. A main shaft drives a first positioning pull rod on a chuck body to extend and contract in the radial direction via a tightening screw, a clamping jaw is at a position within the travel range of extension and contraction, a wheel is positioned and clamped by the fixture, airtight support blocks are pressed down by the wheel and flush with the support plane of the clamping jaw, at this time, airtight ejector rods press second O rings to prevent air from flowing out of the airtight detection position, a detection system of a machine tool detects a preset air pressure value which indicate that the wheel has been placed correctly, and if the wheel is not placed correctly on the fixture, the machine tool will alarm through the detected pressure feedback.