Technical Data／Diamond / CBN Cutting Tools
Diamond / CBN Cutting Tools
Types of Diamond
Diamond / CBN Cutting Tools
■Basic Form of Cutting Tool for Cutting Metal
Diamond
What is Cutting?
Metal cutting is an operation to cause slippage within metal by a shear force induced by compression to separate metal. ◆Cutting, feeding amount (speed) and cutting speed are three cutting conditions; other conditions are called operational conditions.
Polycrystalline Diamond
Single Crystal Diamond
Relief angle
◆The larger the rake angle, the less the cutting resistance. ◆Increasing cutting speed reduces the cutting resistance.
Relief angle
◆Cooling oil cools the cutting edge and workpiece, suppressing softening caused by high temperature and deformation resulting from heat. It is also used to provide a lubrication effect between the cutting edge and chips, thus preventing welding.
Natural Diamond
Synthetic Diamond
■Position of Tool Materials
Diamond
Characteristics of Material
CBN Ceramic
Diamond excels in "hardness" and "heat diffusibility" as a cutting tool material. CBN, with hardness akin to that of diamond is mainly used for cutting ferrous metal thanks to its lower reactivity than diamond with ferrous metal. Both materials can be polished to form "sharp cutting edge."
Coated carbide
Cermet
HSS Cemented carbide
Various Cutting
Toughness
High
High Pressure Synthesis Diamond
ＣＶＤ
Sintered Diamond
ＣＶＤ
Binder-Less
Turning Turning is a process of rotating a workpiece and cutting it with a cutting tool. Lathe machining is typical turning, which machines the workpiece by a general- purpose lathe or an NC lathe using various types of cutting tools. The material and shape of the blade changes according to application.
Hole Drilling Drilling is generally a
Milling Milling is a cutting process that uses a milling machine or a machining center, using a milling tool with multiple blades. Milling tools have various shapes, and the machining form changes according to the shape of the workpiece, including flat machining, side machining, and groove machining. End milling is also a type of milling.
Broaching Broaching is a process using a tool called broach, where a number of cutting edges are arranged in order of dimension along the axis of the outer periphery of a bar body in the broach machine to machine the surface of a workpiece or the inner surface of a hole.
process of attaching a drill to a drilling machine or a machining center to drill a hole in a workpiece. Drilling is also performed with a lathe or a milling machine. A reamer is mainly used for finishing holes. In addition, spot facing, boring, tapping and broaching are also classified as drilling.
■Comparison of Single Crystal Diamond and PCD
■Surface Roughness Comparison for Each Diamond
Material
Single Crystal Diamond
Sintered Diamond (PCD) Diamond Grains （0.5µm〜2µm）
Ultra Precision Cutting Tool (Single Crystal Diamond)
Structure and Crystal Image
Nano Polycrystalline Diamond Cutting Tool
Larger Figures: Easier Polishing
Metallic Binder
Types of Cutting Tool
Isotropy Hardness
☆☆☆
★★☆ 50 GPa
Single Crystal Diamond Cutting Tool
70〜130 GPa
Cutting Edge Sharpness
PCD (Polycrystalline Diamond) Cutting Tool
Cutting Tools A cutting tools is a type of cutting tool with a blade at the end of the shank. The blade material includes Diamond / CBN, high speed tool steel, cemented carbide, cermet, and ceramics.
Reamer A reamer is a tool to finish the hole opened by a drill according to the required accuracy. Similar to the cutting tool, the blade material includes Diamond / CBN, high speed tool steel, and cemented carbide. The number of cutting edges range from one to several depending on the hole diameter and application. In the stepped reamer, the blade is divided into multiple stages, enabling multiple processes with a single reamer.
Drill A drill is a cutting tool that pierces a hole in a workpiece, which has a cutting edge at the tip, and a groove in the body for discharging chips. It is the most common tool among cutting tools, with various shapes and types for application, from the one used at home to the one for special processing.
0
0.05 0.1
0.5
1.0
5
Unit ：µmRa *PCD = Polycrystalline Diamond
Diamond Cutting Tools
Although various materials such as carbide and high-speed steels are used as cutting tools, Diamond tools have excellent "hardness" and "diffusion of heat" compared with these materials. Polished Diamond tools can make "sharp cutting edge." Diamond cutting tools with these characteristics provide superior precision, superior lifetime, and high performance for your work pieces.
■Comparison of Required Characteristics for Cutting Tool Material
Diamond
Cemented Carbide
High Speed Steel
Single Crystal
Polycrystalline Nano-Polycrystalline
Milling Tools A milling tool is a generic term for tools with multiple cutting edges on the outer surface or the end face of a disk or cylindrical body; it cuts the workpiece while rotating. It is mainly used in the milling machine and the machining center; the blade material includes Diamond / CBN, high speed tool steel, and cemented carbide. An end mill is also a kind of milling tools.
Endmill An endmill is a generic term for shank type milling with cutting edge on the outer surface and the end face.
Broach A broach is a tool for
Tap / Thread Cutting Die A tap is a tool for cutting female threads while cutting into the inside of the hole. The thread cutting die is a tool that cuts the male thread in the cylindrical workpiece while turning.
① High Hardness
★★★
★★★
★★★
★☆☆
☆☆☆
② Suitable
machining the surface of a workpiece or the inner surface of a hole in the broaching machine, in which numerous cutting edges are arranged in order of the dimension along the axis of the bar-like main body outer circumference.
☆☆☆
★☆☆
★★☆
★★☆
★★★
Toughness
③ High Thermal Diffusibility ④ Sharpness of Cutting Edge ⑤ Affinity with Ferrous Metals
★★★
★★☆
★★★
★☆☆
★☆☆
★★★
☆☆☆
★★☆
★☆☆
★★☆
☆☆☆
☆☆☆
☆☆☆
★☆☆
★☆☆
⑥ Isotropy
☆☆☆
★★☆
★★☆
★★★
★★★
065
066
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