1. The reason for the milling machine (1) The table rail has a large gap.
(2) The spindle bearing of the milling machine is loose, and the main shaft has a beating or swaying appearance.
(3) The cooperation gap between the small neck at the right end of the milling cutter bar and the hole of the milling machine bracket is too large. During the cutting, the milling cutter rod appears unstable and even beats.
3. The effect of built-up edge on the cutter teeth During the cutting process, a small piece of metal is attached to the tip of the knife. This small metal is a built-up edge, which is very hard. Hard to remove. The effect of built-up edge on the brightness of the processed surface is very large. It is very important to avoid the influence of the built-up edge on the brightness of the processed surface. The way to avoid the leftovers of the built-up edge is:
(1) Use the oilstone backlit teeth in time to improve the brightness of the front of the cutter teeth, so that the chips and the front of the cutters are reduced in conflict.
(2) Selecting a higher or lower milling speed can effectively avoid the occurrence of built-up edge. When using a high milling speed, the cutting temperature rises to around 600 °C. The metal opening at the bottom of the chip becomes soft and micro-melted, so the conflict is cut and quickly taken away by the chips, so the built-up edge will not exist.
(3) For low speed milling, use a larger front angle; for high speed milling, use a smaller front angle.
(4) Fully use cutting fluid (hard alloy high-speed cutting, no cutting fluid).
(5) Reduce the feed rate and reduce the main offset value of the milling cutter (carbide tool).
4. Influence of workpiece data When milling non-ferrous metals, because the raw materials are soft and resistant, the surface to be cut is not easily bright. At this time, adding the rake angle of the cutter teeth and reducing the back angle (cemented carbide cutter) are all beneficial to obtain a bright appearance.
This article was published by Xiangyu Machine Tool on 2013-06-05 