Compact Clamping Device for Hole Drilling via Tapered Bushing
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Solution Overview
Problem
Conventional clamping devices for hole drilling apparatuses are complex and large due to the need for an air clamp mechanism to maintain stable operation, which complicates the apparatus and increases size.
Innovation Solution
A clamping device with a clamp plate, bush, and collet system that uses a tapered design to define the position of the hole drilling tool, allowing for accurate positioning and stable thrust force with a compact design, incorporating a piston cylinder device for downsizing and weight reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an air clamp mechanism is used to expand the collet diameter for stable operation, then the clamping stability is improved, but the device size and complexity increase
Solution Approach 1:
The patent removes the air clamp mechanism from the system entirely. Instead of using pneumatic expansion, the invention uses a purely mechanical tapered bushing and collet system where the bushing's tapered outer surface directly engages with the collet's tapered inner surface through relative movement to expand the collet mechanically without requiring any air pressure system
Solution Approach 2:
The patent replaces the pneumatic system (air clamp mechanism) with a purely mechanical system. The tapered bushing and collet arrangement creates a mechanical expansion mechanism where linear movement of the bushing along the tapered interface converts to radial expansion of the collet, eliminating the need for pneumatic components while achieving the same clamping function
2Reliability
If an air clamp mechanism is used to expand the collet diameter for stable operation, then the clamping stability is improved, but the device size increases
Solution Approach 1:
The patent removes the air clamp mechanism from the system entirely. Instead of using pneumatic expansion, the invention uses a purely mechanical tapered bushing and collet system where the bushing's tapered outer surface directly engages with the collet's tapered inner surface through relative movement to expand the collet mechanically without requiring any air pressure system
Solution Approach 2:
The patent employs a nested arrangement where the collet is positioned inside the bushing, and the bushing itself is nested within the clamp plate assembly. This nested configuration allows the components to be compactly arranged along the tool axis, minimizing the overall device volume while maintaining the functional requirements for clamping stability
3Manufacturing precision
If quantitative fluid acts on the clamp mechanism for adjustment, then the clamping precision is improved, but the apparatus becomes complicated and large
Solution Approach 1:
The patent replaces the pneumatic system (air clamp mechanism) with a purely mechanical system. The tapered bushing and collet arrangement creates a mechanical expansion mechanism where linear movement of the bushing along the tapered interface converts to radial expansion of the collet, eliminating the need for pneumatic components while achieving the same clamping function
Solution Approach 2:
The patent employs dynamic adjustment through the relative movement between the tapered bushing and tapered collet. The system allows for real-time adjustment of the collet expansion degree by controlling the linear displacement of the bushing, enabling precise clamping force control without requiring complex pneumatic pressure regulation systems
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
Enables high-accuracy hole drilling with a stable thrust force while minimizing the size of the clamping device, improving machining accuracy and simplifying the structure.
Implementation Method 1
a bush having a tapered portion whose diameter is expanded to be larger on a front side than on a rear side, the bush being arranged at the clamp plate such as to rotatably support the hole drilling tool; and a collet having a tapered portion whose diameter is reduced to be smaller on a rear end side than on a front end side, the collet suiting the tapered portion of the bush
Implementation Method 2
a clamp plate drive unit for advancing and retreating the clamp plate; wherein the clamp plate drive unit retreats the bush to engage the tapered portion of the bush with the tapered portion of the collet
Data Source
AI summary
A clamping device can clamp a processing object and a hole drilling apparatus with high accuracy, and maintain a stable thrust force with a small size. The clamping device clamps the hole drilling device that drills a hole through the processing object. The clamping device includes: a clamp plate drive unit disposed at the front end portion, on the processing object side, of the hole drilling apparatus; a clamp plate that advances and retreats along the machining shaft of the hole drilling apparatus in association with the clamp plate drive unit; a bush that advances and retreats integrally with the clamp plate, and a collet whose diameter is expanded by the advancing and retreating of the bush to be engaged with a jig plate for position definition of a drill (hole drilling tool) for drilling a hole through the processing object.