Indexable Drill Groove Structure for Insert Mounting and Chip Flow
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Solution Overview
Problem
Small-diameter gun drills face issues with incorrect mounting of cutting inserts and reduced chip discharge performance due to low restriction walls, leading to damage during processing.
Innovation Solution
An indexable drilling tool with a bulging portion on the groove wall of the chip discharge groove that covers part of the cutting insert's top surface, preventing incorrect mounting and maintaining chip discharge efficiency by ensuring the cutting insert is fixed correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small-diameter drilling tool is used, then the tool size is reduced, but the cutting insert and tip seat sizes are reduced leading to incorrect mounting
Solution Approach 1:
The bulging portion acts as an intermediary element between the tip seat and the cutting insert. It provides a physical barrier that prevents the cutting insert from being mounted incorrectly by blocking the insertion path when the insert is misaligned, while still allowing correct mounting when the insert is properly positioned.
Solution Approach 2:
The solution moves from a two-dimensional flat tip seat surface to a three-dimensional structure with a bulging portion protruding toward the cutting insert. This adds a new spatial dimension (height/depth) to the mounting interface, creating a more robust mechanism for ensuring correct insertion orientation.
2Reliability
If a clamping claw is used to fix the cutting insert, then the cutting insert is secured, but the clamping claw occupies large space in the chip discharge groove reducing chip discharge performance
Solution Approach 1:
The solution extracts the chip discharge function from the chip discharge groove by creating a separate discharge path through the bulging portion. The groove is taken out or removed from the traditional configuration, and chip discharge is achieved through the gap created by the bulging portion instead, eliminating the need for a large clamping claw.
Solution Approach 2:
The bulving portion merges multiple functions into a single structure: it provides mounting guidance, prevents incorrect insertion, secures the cutting insert, and creates a chip discharge path. This consolidation eliminates the need for separate clamping claws and maintains chip discharge efficiency.
Data Source
AI summary
An indexable drilling tool includes a cutting insert and a body. The body has a cylindrical shape. The body has a chip discharge groove and a tip seat. The chip discharge groove is in an outer circumference of the body. The tip seat is at a distal end of the body. The tip seat where the cutting insert is placeable wherein. Among wall surfaces constituting the chip discharge groove, a wall surface facing in a direction opposite to a rotating direction of the body. The wall surface has a bulging portion at a distal end thereof. The bulging portion protrudes so as to cover a part of a top surface of the cutting insert. A maximum gap between the bulging portion and the top surface of the cutting insert is smaller than a height of a wall constituting the tip seat.