Indexable Drill Insert Mounting to Block Sludge Entry
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Solution Overview
Problem
In indexable drills, the torque receiving surface intersects with the tip flank, leading to exposure of the contact portion between the torque receiving and transmitting surfaces, which can result in sludge entry during wet cutting, causing wear and potentially shortening the drill's lifespan.
Innovation Solution
The design incorporates a main body chip discharge flute on the drill's tip surface and an insert chip discharge groove on the cutting insert, with a projection portion covering the contact interface to prevent sludge entry, and a shaft and hole configuration to reduce air compression and enhance mounting stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the torque receiving surface intersects with the tip flank to enable torque transmission, then the cutting insert can be securely mounted, but the contact portion becomes exposed and vulnerable to sludge entry during wet cutting
Solution Approach 1:
The invention introduces a projection portion that extends in the axial direction (another dimension) from the contact surface. This projection portion covers the contact portion between the contact surface and the wall surface, preventing sludge from entering the contact interface while maintaining the torque transmission function. The solution moves from a two-dimensional contact surface to a three-dimensional structure with axial coverage.
2Stability of the object's composition
If the contact surface is exposed at the tip portion for torque transmission, then mounting stability is achieved, but wear occurs due to sludge contamination
Solution Approach 1:
The projection portion acts as an intermediary element between the contact surface and the external environment. It covers the contact portion to prevent sludge from reaching the contact interface, thereby protecting the mounting stability while extending drill life by preventing wear.
3Productivity
If chip discharge flutes are designed to remove chips efficiently, then productivity is improved, but the structure becomes more complex
Solution Approach 1:
The invention merges the chip discharge function with the structural components already present in the drill. The insert chip discharge groove is integrated into the cutting insert, and the main body chip discharge flute is formed in the drill main body. These merged structures achieve efficient chip removal without requiring separate, complex chip discharge mechanisms.
Data Source
AI summary
In an indexable drill, a cutting insert having a cutting edge is detachably mounted on an insert mounting seat of a drill main body. The insert mounting seat has a bottom surface facing a tip side of a drill main body, and a wall surface extending to the tip side and facing a drill rotation direction. The cutting insert has a seating surface seated on the bottom surface toward a rear end side of the drill main body, a contact surface coming into contact with the wall surface toward a side opposite to the drill rotation direction, a projection portion projecting to the side opposite to the drill rotation direction on a tip side of the contact surface, and a mounting hole penetrating the seating surface from a tip flank.