Precautions PCBN cutting tools

Note the use of cubic boron nitride cutting tools
If the correct choice of cutting, tool geometry and other processing conditions, it is an efficient long-life PCBN cutting tools , to create a high economic benefits,

but if you use improper methods, it will cause a great waste.
(A) a reasonable choice of cutting parameters: cutting speed should be selected according to material to be processed, generally much higher than the carbide tools.

Cutting hardness HRC55 ~ 65 hardened steel optional cutting speed 80 ~ 120m/min, PCBN cutting hard materials is due to the cutting area

Small areas within a metal softening of the applicants, thus cutting speed is too low, you can not play PCBN cutting tools. Feed generally not greater than 0.2mm / r,

cutting depth generally choose less than 0.3mm.
(2) a reasonable choice of tool geometry parameters: Since PCBN tool toughness than ceramics, less than carbide, so the choice of tool geometry parameters of the main

consideration is to ensure edge strength, rake angle generally opt (0 ° ~ -10 °), posterior horn choose a smaller, 10

°. Addition to special requirements in order to ensure tip strength, knife sharp corners generally not less than 90 °; blade to grind negative chamfer, generally

taken to be 0.2mm × (-15 ° ~ -30 °), before use use 30 ~ 50 times the magnifying glass on the tool checks to ensure cutting edge without chipping.
(3) cooling and lubrication: the tool to other materials, the use of coolant will help improve surface finish and longer tool life, but for PCBN tools except in very

special circumstances, do not add coolant to achieve the desired processing of the same quality and longer tool life of PCBN

Tool is not afraid of hard afraid soft. If coolant is used, you can not use water-soluble coolant, because CBN easy to produce at 1000 ℃, hydrolysis, resulting in a

serious tool wear.
(4) of the machine process systems: As PCBN tool used for hardened steel and cast iron and other difficult to machine materials, cutting and chamfering tool has a

negative, and thus greater radial force. This requires the machine rigidity and precision is better, the system should be small vibration, tool overhang installation

Arm should be small, PCBN cutting tool is not suitable for waste-sided machining.
At present, although the relative price of PCBN cutting tool material carbide and ceramic tools price is also high, but equally to each of the tool on the workpiece

material costs are lower than other tools, the use of advanced machining technology when, if grinding machine and other production equipment investment apportioned

Costs, the use of PCBN tools will bring greater economic benefits. SMEs in general, finishing grinding process is always the bottleneck in the manufacturing process,

if the purchase of good performance lathes, using PCBN cutting tools, application to turning instead of grinding and other advanced machining work

Arts, save equipment investment, increased productivity, but also greatly increase the flexibility of the processing. In addition, the present due to the increase of

personnel costs and environmental requirements, and vigorously promote the use of PCBN cutting tools, give full play to their potential effectiveness, improve

machinability

Technical level is of great significance.