Retractable Drill Supports for Stable Deep-Hole Gun Drilling
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Solution Overview
Problem
Conventional gun drill machines face challenges in stabilizing the operation of gun drills during deep hole processing, particularly when dealing with small diameters and long lengths, leading to instability and potential breakage due to the skipping rope or ballooning phenomenon, and require significant margin lengths that destabilize the working state.
Innovation Solution
The gun drill machine incorporates a bed, spindle unit, chip box, and workpiece holder with a swing stopping device that includes a finger unit and derricking arm, allowing the swing stopping devices to retract and avoid interference with the spindle unit, enabling stable operation by loosely holding the gun drill and reducing the overall length required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the gun drill length is increased to provide sufficient margin for stable operation, then the stability during processing is improved, but the overall device complexity and required space increase
Solution Approach 1:
The swing stopping device is designed to move dynamically between a retracted position (when not needed) and an action position (when swing stopping is required). This allows the system to have a compact overall structure while providing extended functionality when needed, resolving the contradiction between compactness and operational stability
Solution Approach 2:
The swing stopping function is extracted as a separate, movable device rather than being integrated into the fixed gun drill structure. This allows the swing stopping mechanism to be positioned optimally during operation and retracted when not needed, reducing the permanent margin length required while maintaining stability during processing
2Device complexity
If the swing stopping device is fixed in position, then the structure is simpler, but it interferes with the moving spindle unit during operation
Solution Approach 1:
The swing stopping device incorporates movable components that can shift position along the gun drill axis. The fingers can move between engaged and disengaged positions, allowing the device to adapt to the moving spindle unit without requiring complex fixed structures, thus resolving the contradiction between structural simplicity and operational ease
3Manufacturing precision
If the gun drill length is reduced to minimize margin, then the processing precision is improved, but the stability during high-speed rotation deteriorates
Solution Approach 1:
The swing stopping device provides preliminary stabilization support at the rear end of the gun drill before the actual processing begins. By pre-positioning the swing stopping fingers to contact and stabilize the gun drill, the system can use shorter gun drills with improved precision while maintaining rotational stability through the preliminary stabilization action
Data Source
AI summary
A gun drill machine capable of shortening a margin dimension required in a gun drill as much as possible. In a free zone between a chip box and a moving spindle unit, a plurality of swing stopping devices for loosely holding a gun drill and suppressing the swing of the gun drill are arranged, and each swing stopping device is configured to freely retract from a steady action position where a swing stopping action is performed to avoid interference with the spindle unit that moves in the free zone.