Mini Cutting Bit Flute Structure for Chip Breaking and Ejection
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Solution Overview
Problem
Conventional mini cutting bits are prone to damage due to high brittleness and poor chip removal capabilities, especially at low spindle speeds, making them unsuitable for complex and fine cutting tasks with small workpieces.
Innovation Solution
A mini cutting bit design featuring a shank with a cutting part that includes spiral portions, chip removal flutes, and chip breaking flutes, which are parallel and strategically positioned to enhance chip ejection and reduce the risk of damage by breaking chips into smaller pieces, thereby improving the bit's durability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the diameter of the cutting bit is reduced to process small workpieces, then the adaptability to complex and fine cutting tasks is improved, but the brittleness increases and the risk of damage increases
Solution Approach 1:
The cutting bit is segmented into multiple functional zones including chip breaking flutes and chip removal flutes. The chip breaking flutes are specifically designed to break chips into smaller pieces, preventing chip entanglement and reducing the risk of damage to the mini cutting bit during operation
2Productivity
If the spindle speed is increased to process small workpieces with mini cutting bits, then the cutting performance is improved, but the requirement for machine tool speed increases which conventional machines cannot meet
Solution Approach 1:
The invention changes the geometric parameters of the cutting bit, specifically designing chip breaking flutes with controlled widths and depths, and optimizing the spiral portion geometry. These parameter changes enable effective chip breaking and removal at various spindle speeds, making the mini cutting bit adaptable to both high and low speed operations
3Speed
If the mini cutting bit is used at low spindle speeds, then the machine tool limitation is avoided, but the chip removal capability deteriorates and the bit is more prone to damage
Solution Approach 1:
The flute structure is segmented into chip breaking flutes and chip removal flutes with distinct functions. The chip breaking flutes break chips into manageable pieces, while the chip removal flutes efficiently evacuate the broken chips from the cutting zone, ensuring effective chip removal even at low spindle speeds
Solution Approach 2:
Different sections of the cutting bit have different geometric qualities optimized for specific functions. The chip breaking flutes have specific width and depth characteristics for breaking chips, while the chip removal flutes have optimized geometry for efficient chip evacuation, with each section tailored to its local function
4Ease of manufacture
If the cutting bit structure is simplified, then the manufacturing ease is improved, but the chip breaking and removal capability deteriorates
Solution Approach 1:
The cutting bit employs a segmented flute structure with chip breaking flutes and chip removal flutes. This segmentation achieves effective chip breaking and removal through straightforward geometric features that can be manufactured using conventional machining processes, balancing manufacturing simplicity with functional effectiveness
Data Source
AI summary
A mini cutting bit includes a shank and a cutting part. The cutting part has a first spiral portion and a second spiral portion parallelly and twistedly formed thereon. The cutting part further has two chip removal flutes between the first and the second spiral portions. The first spiral portion has a first chip breaking flute on a top thereof while the second spiral portion has a second chip breaking flute. Widths of the first and the second chip breaking flutes are smaller than that of the tops of the first and the second spiral portions respectively.