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Industry news

The term refers to the cutting tool

2015-06-01
There are three elements in metal cutting: cutting speed AP cutting depth VC feed quantity f.
Cutting speed VC (m/min):
The instantaneous speed of the blade relative to the active direction of the machining surface is the instantaneous speed of the tool cutting edge.. (it is a measure of the quality of a tool, the cutting edge of a certain point relative to the processing surface in the active direction of the instantaneous speed.)
The cutting depth of AP (mm) (cutting depth):
The maximum size of the cutting layer in the direction of the feed rate. The vertical distance between machined surface and the surface of the workpiece surface is generally referred to.. For machining of cylindrical workpiece, the 1/2, which is machined surface and the diameter difference of the machined surface, is the single cutting depth. Measurement of motion direction in feed. "The conversion of feed per minute" into "feed per revolution" is the amount of feed. Cutting width is equal to working length of cutting edge. The main angle is 90 degrees when the cutting width = cutting depth. (the drill bit diameter backcutting depth = /2)
Feed f (mm):
Displacement of the tool relative to the workpiece in the feed direction of the tool. (feed rate vf=f*n. If it's a multi - tooth cutter
Vf= fz* number of teeth per tooth z* number n speed of the
Terms for judging the performance of the tool
Corrosion resistance: the ability of the metal material to resist the corrosive action of the surrounding medium is called corrosion resistance..
Hardness: the ability to resist hard material into its surface is called hardness..
The hardness of the tool was measured by (Rockwellhardness), which was raised by Rockwell (S.P.Rockwell) in 1921, and was measured by the hardness of the metal materials measured by the Lo's hardness tester.. The values have no units, only code "HR", said the measuring method is that, in the provisions of plus load, ball or diamond pressure head vertical pressure into the surface of the tested materials, dent, according to the load is removed after the dent depth, using Rockwell Hardness Calculation Formula = (K-H) / C can calculate the Rockwell hardness. The hardness of the meter is displayed on the dial of the hardness meter, which can be read directly..
When the tool is removed from the workpiece material, the hardness of the tool material must be higher than the hardness of the workpiece material.
The lowest hardness of cutting tools should be above 60HRC
The hardness of carbon tool steel in room temperature is 62HRC, the hardness of high speed steel is 63~70HRC, and the hardness of cemented carbide tool is 89~93HRC.
Strength: the ability of metal materials to resist permanent deformation and fracture under the action of force is called strength..
Toughness: toughness refers to the resistance when subjected to stress, which is defined as the ratio of the energy absorbed by the material to the volume of the energy absorbed before the rupture..
Abrasion resistance: the material is capable of resisting wear under certain friction conditions, and the reciprocal of wear rate is evaluated.. The higher the wear resistance, the better.
The hot hardness: the hot hardness and the red hardness, refers to the steel at the higher temperature, can still maintain the high hardness performance. The higher the hardness of the tool material, the better the heat resistance, the better the plastic deformation and the wear resistance of the material at the high temperature.
Thermal conductivity: the performance of the heat conduction of metal is called thermal conductivity.. (the tool has good thermal conductivity, which is easy to conduction of the heat of cutting, cutting the temperature of cutting tool, cutting tool wear. The thermal conductivity of the tool material is good, and its heat resistance and heat resistance and crack resistance are also strong. .