July 03, 2017

Research on cemented carbide end mills of Profile Based on its maintenance and selection

There are two main types of milling methods for carbide end mills' direction and rotation direction of milling cutter:
The first type is the milling,the rotation direction of the milling cutter and the cutting direction of the feed are the same, and the milling cutter holds the workpiece and cuts the final chip in the beginning of cutting.
Inverse milling,the second is the direction of rotation of the milling cutter and cutting feed direction is opposite,cutter before start cutting must be slipping a on the workpiece,start with cutting thickness is zero, the cutting at the end of the maximum cutting thickness.
When milling,the workpiece is pressed to the workbench by cutting force,and the workpiece is removed from the worktable during milling.Because of the best cutting effect of milling,it is usually preferred to milling,only when the machine has the problem of thread clearance and the problem of unsolved problem.
The cutting edge of carbide end mills should bear the impact load every time it enters the cutting.The load size depends on the cross section,workpiece material and cutting type of the chip. In the ideal condition, the diameter of the milling cutter should be larger than that of the workpiece, and the axis of the milling cutter should always be slightly away from the center line of the workpiece.When the cutter is placed in the cutting center, it can easily produce burrs. Cutting edge into the cutting and cutting out the direction of the radial cutting force will continue to change, machine tool spindle can vibration and damage, the blade may rupture and processing surface will be very rough, hard alloy cutter slightly off center, cutting force direction will no longer fluctuations, cutter will receive a pre load.
Maintenance of carbide milling cutter
When the axial line of carbide milling cutter or the edge line of the workpiece is superimposed or close to the edge of the workpiece, the situation will be serious,and the operator should do the relevant equipment maintenance work.
1. Check the power and rigidity of the machine to ensure that the required milling cutter diameter can be used on the machine tool.
2. The weight of the cutter in the spindle is as shortest as possible,reducing the impact of the milling cutter axis and the position of the workpiece on the impact load.
3. The suitable for the process of the correct cutter tooth pitch,to ensure that did not too much during the cutting blade mesh and artifacts caused by the vibration at the same time, on the other hand,in the narrow artifacts or milling milling cavity to ensure that there are enough blades and workpiece mesh.
Make sure to use every blade in order to get the correct cutting effect when the chip is thick enough to reduce the knife wear.The forward corner slot can be used to achieve a smooth cutting effect and minimum power.
5. Select the diameter of milling cutter suitable for workpiece width.
Choose the right major Angle.
Place the milling cutter correctly.
8. Use cutting fluid only if necessary.
Follow tool maintenance and maintenance rules and monitor tool wear.
The maintenance of carbide milling cutter can prolong tool life and improve work efficiency.
Choice of carbide milling cutter
Milling stainless steel in addition to the vertical milling cutter and cemented carbide end mills and the parts of the cutter material,the rest of the all kinds of milling cutter adopt high speed steel, especially high tungsten, molybdenum and vanadium high speed steel has a good effect, the tool life than W18Cr4V 1 ~ 2 times. The hard alloy plate for making stainless steel mill is YG8,YW2,813, 798, YS2T, YS30, YS25, etc.
The effect of spray cooling method is most obvious,which can increase the durability of milling cutter more than double. If the normal 10% emulsion cooling is used,the cutting fluid flow should be guaranteed to be fully cooled. When the carbide milling cutter is milling stainless steel, the Vc = 70 ~ 150m/min, Vf = 37.5 ~ 150mm/min, and it should be adjusted according to the alloy plate number and the different materials.
The adhesion of stainless steel and strong melting ability are easy to stick to the blade of the milling cutter,making the cutting condition deteriorate. In reverse milling, the blade starts to slide on the hardened surface, increasing the trend of working hardening.The impact and vibration of milling are larger, and the cutter blade is easy to be broken and worn.
When machining stainless steel, the cutting edge should be sharp and bear the impact. Can use the big spiral Angle cutter (cylindrical milling cutter, end mill), spiral Angle b increased from this, the tool life can be increased by more than 2 times, because work at the moment of the milling cutter rake Angle g0e by 11 ° increased to more than 27 °, milling fast. But b value should not be again big, especially the vertical milling cutter with b 35 ° or less advisable, so as to avoid weakening the blade.

For more details just visit our website at http://www.wococarbide.com/


Posted by: hannahgwendolyn at 09:33 AM | No Comments | Add Comment
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