Chuck Device Tapered Faces Axial Holding Force
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Solution Overview
Problem
Existing chuck devices inadequately hold workpieces when machining one side in the axial direction, leading to insufficient holding force and potential workpiece damage.
Innovation Solution
A chuck device with a cylindrical design, featuring a tubular outer cylinder and axially movable sleeve, incorporates tapered faces that restrict axial movement and apply pressing forces to securely hold bar-like workpieces, utilizing a combination of movement-restricting and pressing tapered faces to average pressing forces and enhance holding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional chuck device is used to hold a workpiece for machining one side in the axial direction, then the workpiece can be held, but the holding force is insufficient and the workpiece may be damaged
Solution Approach 1:
The chuck is divided into multiple segments along its axial direction, with each segment having independent contact surfaces (first contact part and second contact part) that can apply holding forces at different locations. This segmentation allows the chuck to distribute and optimize holding forces across multiple points, improving overall holding capability while protecting the workpiece.
Solution Approach 2:
Different portions of the chuck have different functional characteristics - the first contact part and second contact part are designed with different tapered faces having different angles, allowing each local region to optimize its holding characteristics for specific machining operations, thereby improving overall holding force distribution.
2Device complexity
If a single tapered face design is used in the chuck, then the structure is simple, but the pressing force distribution is uneven causing potential workpiece damage
Solution Approach 1:
The chuck incorporates multiple tapered faces with different angles at different locations (first tapered face with angle α1, second tapered face with angle α2 where α1 < α2). This local differentiation allows each region to optimize pressing force distribution, preventing concentration of stress that could cause workpiece scarring or biting, while maintaining overall structural efficiency.
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 chuck device effectively holds workpieces by averaging pressing forces and reducing the risk of bite or scarring, ensuring secure retention during machining operations.
Implementation Method 1
A movement-restricting tapered face is formed in the restriction part of the outer cylinder and a pressing tapered face is formed in the pressing part of the sleeve
Implementation Method 2
a restriction part configured to restrict axial movement of the chuck by abutting on the first contact part
Data Source
AI summary
A chuck device includes: a cylindrical chuck including a first contact part on a first side and a second contact part on a second side, and configured to hold a bar-like workpiece; a tubular outer cylinder including a restriction part configured to restrict axial movement of the chuck by abutting on the first contact part; and a sleeve provided in an axially movable manner on the inner peripheral side of the outer cylinder, and including, on the first side, a pressing part axially driven to abut on the second contact part. The chuck includes a first tapered face in the first contact part, and a second tapered face in the second contact part. A first angle between the first tapered face and a center axis is equivalent to a second angle between the first tapered face and the center axis, or is smaller than the second angle.