What tools are generally used for cast iron machining?
Cast iron can be divided into gray cast iron, white cast iron, malleable cast iron, ductile iron, vermicular graphite iron, alloy cast iron and so on. Among them, gray cast iron is widely used in the automobile industry, and the automobile industry is a large demand for CNC tools, so processing plants often have the processing needs of gray cast iron.
So, what kind of tool is used to process ordinary cast iron?
The common common cast irons referred to in this article are gray cast iron, ductile iron and austenitic cast iron. Due to the content of graphite, ductile iron affects its processing performance. Generally, an economical coated alloy milling cutter for solid carbide rods can be used.
Ordinary cast iron machining tools, economical tungsten steel milling cutters can be competent. Secondly, cobalt-containing high-speed steel tools can be used.
3. What kind of tool is used for difficult-to-machine cast iron
Here we will only exemplify chilled cast iron for the time being. Chilled cast iron is a kind of wear-resistant cast iron. When casting cast iron, by accelerating the cooling of the surface layer of the cast iron for a while, the surface layer can obtain an encyclopedic cast iron structure, forming a high hardness and wear resistance. high characteristic. Chilled cast iron can be divided into ordinary chilled cast iron, nickel-chromium chilled cast iron, high-chromium white iron and chromium-vanadium white iron.
1) Processing characteristics of chilled cast iron
Chilled cast iron has high hardness, high brittleness, high unit cutting force, and its chips are in a broken shape. Because the tip of the tool is in short contact with the cutting, the cutting force and cutting heat are concentrated near the cutting edge, which is easy to let the tool Wear and tear occurs. The machining parts of chilled cast iron are mostly blanks, and the machining allowance is large and uneven, which increases the difficulty of machining cast iron. Of course, there are good solutions for cast iron machining tools and cast iron milling cutters.
2) Selection of chilled cast iron machining tools
For machining chilled cast iron, it is best to choose tool materials with high hardness, good wear resistance and certain strength. Generally, coated fine-grained or ultra-fine-grained YG-type cemented carbide or alumina ceramic tools are used.
3) Cutting amount of chilled cast iron milling cutter
Carbide tool; low speed and high feed. V=9m/min or so, the feed rate is generally selected according to the main declination angle and the amount of back cutting. Select 0.5mm/r for rough machining of cast iron and 0.1~0.4mm/r for finishing of cast iron.
Ceramic tools; generally choose high-speed milling, rough and semi-finishing cast iron V=50~80m/min, and V=80~120m/min for finishing.
Cast iron machining tools, such as knives, can be roughed, semi-finished and finished. If you don't know what kind of milling cutter to use for cast iron, of course, you should choose YG type carbide tool for machining cast iron milling cutter.
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