Gun Drill Guide Pad Layout for Tip-Replaceable Body Strength
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Solution Overview
Problem
Gun drills face challenges in securing strength during machining, particularly for tip-replaceable-type drills that require recessed parts for both the cutting insert and guide pad, leading to difficulties in maintaining body strength and preventing guide pad damage due to excessive thinning or insufficient thickness.
Innovation Solution
A guide pad design with a circular-arc-shaped first surface, a flat second surface, and a through hole that positions the central axis farther from the surface to which stress is applied, increasing the thickness of the stressed portion without increasing the guide pad thickness, along with a reinforcing wall and coolant-guiding grooves to enhance strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If recessed parts are provided for both cutting insert and guide pad in tip-replaceable-type gun drill, then the functionality is improved, but the strength of the body deteriorates
Solution Approach 1:
The asymmetric through hole positioning creates localized structural reinforcement in the guide pad at critical stress points. This allows the guide pad to maintain sufficient strength despite the presence of recessed parts in the body, as the reinforced guide pad compensates for the body structure compromised by the recesses needed for tip and guide pad attachment.
Data Source
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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.