Reamer Cutting Head Deflecting Surface Chip Evacuation
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Solution Overview
Problem
The high production cost of rotary cutting tools for reaming operations is primarily due to the expensive and time-consuming grinding process required to form chip spaces, which contributes significantly to the overall cost of the tools.
Innovation Solution
The design incorporates a cutting head with wiping pads and a deflecting surface that deflects chips forward, eliminating the need for rearwardly extending chip flutes, and features a peripheral section divided into multiple sections to reduce grinding requirements, thereby lowering production costs and improving cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional grinding process is used to form chip spaces, then chip evacuation is achieved, but production cost increases and manufacturing time extends
Solution Approach 1:
Instead of forming chip spaces by removing material through grinding, the invention inverts the approach by forming chip spaces through material deposition or additive processes, or by using a different mechanism entirely (such as forming channels during the shaping process itself) to achieve chip evacuation without the expensive and time-consuming grinding operation.
2Reliability
If rearwardly extending chip flutes are used, then chips are evacuated, but the likelihood of chip entrapment increases
Solution Approach 1:
Instead of using rearwardly extending chip flutes that can trap chips, the invention inverts the chip evacuation approach by directing chips forward or using a different evacuation mechanism that eliminates the entrapment problem inherent in traditional rearward-flute designs.
3Manufacturing precision
If extensive grinding is performed on peripheral surface, then surface quality improves, but production cost increases
Solution Approach 1:
The peripheral surface is divided into multiple peripheral sections (first, second, and intermediate sections) with different surface quality requirements. Only the sections requiring high precision undergo grinding, while other sections use less intensive finishing processes, thereby reducing overall production cost while maintaining necessary surface quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces the need for costly grinding processes, decreases the likelihood of chip entrapment, enhances surface quality, and improves cooling efficiency, resulting in a more cost-effective and efficient reaming operation.
Implementation Method 1
a deflecting surface adjacent the rake surface and generally transverse thereto, the deflecting surface extending from the rake surface first end in a direction away from the cutting edge
Implementation Method 2
the peripheral surface comprising at least two wiping pads extending rearwardly from the cutting head forward end
Implementation Method 3
a cutting edge extending from the cutting head forward end in a rearward and radially outward direction to the peripheral surface
Data Source
AI summary
The present invention provides a cutting head of a reamer. At least two wiping pads extend rearwardly from a cutting head forward end. At least one cutting section comprises a cutting edge that extends from the cutting head forward end to the peripheral surface. The cutting edge is formed at the intersection of a rake surface and a relief surface. The rake surface is generally tangentially directed and faces a direction of rotation. A deflecting surface is formed adjacent the rake surface and generally transverse thereto. The deflecting surface extends from a rake surface first end in a direction away from the cutting edge. The deflecting surface makes an acute axial angle with respect to the axis of rotation. A rear end of the deflecting surface joins the peripheral surface adjacent the cutting section and distal the rear end of the cutting head.