Double Disc Grinding Non-Circular Clamp Rotation
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Solution Overview
Problem
Conventional double disc grinding machines face challenges in rotating works without recesses and achieving high machining accuracy and efficiency, due to limitations in anti-rotation mechanisms and movement during grinding.
Innovation Solution
A double disc surface grinding machine with a clamp member having a non-circular outer circumferential portion and a storage portion with a non-circular inner circumferential portion, allowing for rotation and movement of the workpiece, along with a grinding wheel feeding mechanism to sandwich the workpiece for precise grinding of two main surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional anti-rotation means (protrusion-recess mechanism) is used to rotate the work, then the work can be rotated, but the work cannot be rotated if it does not have a recess formed, resulting in decreased machining accuracy
Solution Approach 1:
The invention introduces a clamp member as an intermediary between the storage portion and the work. The clamp member has a non-circular outer circumferential portion that engages with the non-circular inner circumferential portion of the storage portion, enabling rotation transmission without requiring any modification to the work itself. This mediator approach resolves the contradiction by providing universal adaptability while maintaining precise rotation control.
Solution Approach 2:
The invention employs non-circular shapes for both the inner circumferential portion of the storage portion and the outer circumferential portion of the clamp member. This asymmetric design creates a mechanical engagement that prevents relative rotation between the storage portion and clamp member, while allowing the entire assembly to rotate together. This asymmetric geometry ensures reliable rotation transmission without requiring recesses in the work.
2Manufacturing precision
If an elastic member is pressed onto the outer circumferential surface of the work to generate frictional force for rotation, then the work can be rotated, but the work cannot move in the up-down direction during grinding, resulting in decreased machining accuracy
Solution Approach 1:
The invention separates the rotation function from the workpiece by using a dedicated clamp member with non-circular geometry. The storage portion rotates with the work-clamp assembly, and the non-circular engagement between storage portion and clamp member ensures synchronized rotation without requiring friction-based coupling to the work. This segmentation allows the work to move freely in the up-down direction during grinding while maintaining precise rotation control.
3Productivity
If the work is pressed into the inner circumferential region of the elastic member for placement in the jig, then the work can be secured, but this process is time consuming and decreases grinding efficiency
Solution Approach 1:
The clamp member is pre-positioned on the work before placing the assembly into the storage portion. The non-circular outer circumferential portion of the clamp member is already formed and ready to engage with the storage portion. This preliminary preparation eliminates the need for time-consuming pressing operations during work placement, as the clamp member and storage portion are designed to engage directly through their complementary non-circular geometries.
4Reliability
If conventional anti-rotation mechanisms are used, then rotation control can be achieved, but the device complexity increases and movement during grinding is restricted
Solution Approach 1:
The invention uses simple non-circular geometric shapes for the storage portion and clamp member to achieve anti-rotation functionality. This asymmetric geometry inherently prevents relative rotation between components without requiring complex mechanical mechanisms. The simplicity of the geometric design maintains low device complexity while ensuring reliable rotation control and freedom of movement during grinding.
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 configuration enables the rotation and efficient grinding of works without recesses, improving machining accuracy and efficiency by allowing movement during grinding and reducing the need for complex anti-rotation mechanisms.
Implementation Method 1
a storage portion (52) having a non-circular inner circumferential portion (52a) engageable with the outer circumferential portion (66a) of the clamp band (66)
Implementation Method 2
a pair of grinding wheels (14a, 14b) opposed to each other, with a distance therebetween in a first direction, to rotate for grinding a work
Data Source
AI summary
A double disc surface grinding machine includes a clamp band which has a non-circular outer circumferential portion. The clamp band is attached to an outer circumferential surface of a work and is housed, under the attached state, in a storage portion which has a non-circular inner circumferential portion engageable with the outer circumferential portion of the clamp band, movably in a first direction. A rotation drive unit rotates the storage portion around a first rotation shaft extending in the first direction, to make the inner circumferential portion of the storage portion engage with the outer circumferential portion of the clamp band, thereby rotates the clamp band and the work together with the storage portion. At least one of the grinding wheels is fed onto the work so as to sandwich the work with a pair of rotating grinding wheels for grinding two main surfaces of the work.