Cubic Boron Nitride Cutting Tool Rake Face Grinding Method
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Solution Overview
Problem
Existing cubic boron nitride cutting tools face challenges in achieving accurate center height and flexible edge processing due to uneven grinding of materials with different hardness, leading to edge dullness and reduced sharpness, particularly in small-diameter applications.
Innovation Solution
A method involving controlled grinding of the sintered cubic boron nitride compact using a numerically controlled grinder with a single chuck, where the compact is pressed against an end face of the grindstone to form a recessed rake face, preventing simultaneous grinding and edge dullness, and allowing for precise adjustment of the negative rake face.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If simultaneous grinding of sintered cubic boron nitride compact and base metal is performed, then the rake face and top face can be formed flush, but the grindstone becomes loaded with chips and the flatness of the rake face decreases due to uneven contact
Solution Approach 1:
The grinding process is divided into two separate operations: first grinding the base metal top face, then separately grinding the sintered cubic boron nitride compact rake face. This segmentation prevents chip loading issues and maintains grindstone effectiveness, thereby preserving rake face flatness while still achieving flush alignment between surfaces.
Solution Approach 2:
The base metal top face is ground in advance before attaching the sintered cubic boron nitride compact. This preliminary action ensures the base metal surface is properly prepared and flat, allowing for precise subsequent grinding of the compact rake face to achieve flush alignment without compromising either surface quality.
2Area of stationary object
If the area over which faces are ground is made large, then the rake face can be formed, but the grindstone inevitably comes into contact with materials unevenly due to shaking, reducing flatness
Solution Approach 1:
The large area grinding operation is segmented into two separate grinding zones and two separate operations. First, the base metal top face is ground over its entire area. Then, the sintered compact rake face is ground separately over its area. This prevents uneven contact across the large combined area while still achieving the required rake face dimensions and flatness.
3Strength
If negative rake face is formed to strengthen cutting edge, then strength is improved, but sharpness is reduced
Solution Approach 1:
The cutting edge geometry is optimized with a negative rake face configuration that provides local reinforcement at the cutting edge zone. The negative rake angle creates a stronger, more robust edge geometry that resists chipping and deformation, while the precise grinding process ensures the edge remains sharp through controlled material removal and proper surface finish.
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 method enhances the accuracy of the center height and flexibility of edge processing, reducing the angle of inclination and width of the negative rake face, thereby improving the sharpness and processing accuracy of the cutting tool.
Implementation Method 1
grinding a sintered cubic boron nitride compact disposed at a corner of a base metal by pressing the sintered cubic boron nitride compact against an end face of a grindstone of a grinder
Data Source
AI summary
A method for manufacturing a cubic boron nitride cutting tool including a base metal and sintered cubic boron nitride compact at a corner portion of the base metal, capable of improving the accuracy of the center height and reducing the angle of inclination or width of a negative rake face; and the cubic boron nitride cutting tool. The method includes grinding the compact by pressing it against an end face of a grindstone of a grinder to form flank and rake faces on the compact while the base metal of the cutting tool is held by a chuck of the grinder, so that the compact is substantially ground. The rake face is formed to be recessed from a top face of the base metal or only a portion of the compact that protrudes from a base-metal rake face is ground while the tool is continuously held by the chuck.