Gun Drill Guide Pad Structure for Small-Diameter Strength
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Solution Overview
Problem
Conventional gun drills face challenges in securing strength, particularly for tip-replaceable types, due to the need for recessed parts to attach guide pads, leading to potential damage or insufficient body strength during machining of small-diameter holes.
Innovation Solution
The guide pad design includes a through hole configuration with a circular-arc-shaped first surface and an inclined central axis, positioning the through hole farther from the stress-bearing surface, and a reinforcing wall to enhance strength without increasing thickness, along with grooves to guide coolant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If recessed parts are added to attach guide pads, then the guide pad attachment is enabled, but the body strength is reduced
Solution Approach 1:
The guide pad is integrated with the body through a through hole that passes completely through the guide pad thickness. Fastening members extend through this through hole to secure the guide pad to the body, creating a merged structure where the guide pad and body function as a unified assembly. This integration eliminates the need for separate recessed attachment features while maintaining secure connection.
Data Source
AI summary
Provided are a guide pad having sufficient strength and a gun drill having the guide pad. A guide pad includes: a first surface; a second surface that is a flat surface located at a position opposed to the first surface; and a third surface that connects the first surface and the second surface to each other. When viewed along a rotational center axis, the first surface is a circular-arc-shaped surface, and when a point at which a virtual line passing through a circular-arc center of the first surface and perpendicular to the second surface and the second surface cross each other is assumed as a first point and a point at which a central axis of the through hole and the second surface cross each other is assumed as a second point, the first point is located at a position closer to the third surface than the second point.