October 20, 2017

there are special considerations when carbide milling cutters is cutting

carbide milling cutter is made of materials refers to the use of cemented carbide carbide cutter. Understand the need to know what istungsten carbide, hard alloy with high hardness of refractory metal carbides (WC, TiC) micron powder as the main ingredient, with cobalt or nickel (Co) (Ni), molybdenum (Mo) as the binder, powder metallurgy products in vacuum furnace or hydrogen reduction furnace in sintering.

In the three edge milling cutter, milling or some surface milling, cutting force in different directions. Surface milling, milling cutter in the workpiece just outside the cutting force in the direction of more special attention should be paid. When the milling, the cutting force will work pressure to the work table, cutting force inverse milling workpiece and left the table.

As the cutting effect of progressive milling is the best, milling is usually preferred. Only when there is a screw gap in the machine tool or a problem that can not be solved by forward milling, reverse milling is taken into account

In an ideal situation, the diameter of the cutter should be higher than the width of the workpiece, cutter axis and workpiece center line should always leave some distance. When the tool is placed on the center of cutting, easy to produce burr. Continuous cutting edges entering and withdrawing from cutting when the radial cutting force direction will change, and it may damage the spindle vibration the blade may be broken, the surface will be very rough, with slightly off center, cutting force direction will not change anymore -- cutter will get a pre load. We can put the center of milling to drive on the road.

Every time into the carbide cutting cutter, cutting edges are subjected to impact load, transverse load depends on the size of the chip, workpiece material and cutting type. Cutting, between the cutting edge and the workpiece is correctly occlusion is an important direction.

When the cutter axis is completely on the lateral width of the workpiece, the impact force at the cut in is borne by the outer blade tip, this will mean that the impact load from the initial part of the most sensitive tool to bear. The last and carbide cutter to the tip off the workpiece, that is to say from the beginning to leave the cutting blade, cutting force effect has been on the outside of the tip, until the impact unloading so far. When the center line of the cutter is located in the edge line, when the chip thickness reaches the maximum when the blade from the cutting load, reaches the maximum at the cutting impact. When carbidemilling cuttersaxis line is located within the width of the workpiece, the initial impact load when starting position the distance along the cutting edge by far the most sensitive point in the back and bear, knife blade smooth exit cutting.

For each blade, when to exit when cutting off the workpiece cutting edge way is important. The remaining close when retracting materials may be much reduced. When the blade gap chip from the workpiece along the blade rake surface will produce an instantaneous tensile force and burrs on the workpiece. This often produces the tensile force in dangerous situations endangering the cutting edge.

Posted by: hannahgwendolyn at 09:35 AM | No Comments | Add Comment
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