CNC Knowledge: What tools are generally used for processing cast iron?

1. Types and features of cast iron processing

Cast iron can be classified according to its classification: gray cast iron, white cast iron, malleable cast iron, ductile cast iron, vermicular graphite cast iron, alloy cast iron, etc. Among them, gray cast iron is widely used in the automobile industry, and the automobile industry is a large demander for CNC tools, so processing factories often have gray cast iron processing needs.

2. What tools are used to process ordinary cast iron?

The common cast irons mentioned in this article are gray cast iron, ductile iron and austenitic cast iron. For example, alumina-coated carbide cutters are primarily capable of cutting gray cast iron. Since the graphite content of ductile iron affects its processing performance, economical coated alloy cutters with solid carbide shanks can generally be used.

Ordinary cast iron processing tools and economical tungsten steel cutters can do the job. Second, high-speed steel cutting tools containing cobalt can be used.

3. What tools should I use for difficult-to-machine cast irons?

Here, for the moment, we only give an example of refrigerated cast iron. Chilled cast iron is a kind of anti-wear cast iron. When casting cast iron, it accelerates the cooling of the surface of the cast iron for a certain time, thereby allowing the surface to flow. to acquire the encyclopedia cast iron structure, forming high hardness and high wear resistance. Chilled cast iron can be divided into ordinary refrigerated cast iron, nickel-chromium refrigerated cast iron, high chromium tinplate and chrome-vanadium tinplate.

1) Processing characteristics of chilled cast iron

Cooled cast iron has very high hardness and brittleness, and the unit cutting force is also very large. In addition, its chips are broken because the tool tip is in extremely short contact with the cutting edge, cutting force and cutting heat. are concentrated near the cutting edge, which can easily cause the tool to collapse, cause wear and damage. Most of the parts machined from chilled cast iron are blanks, with large and uneven machining allowances, which increases the difficulty of cast iron processing. Of course, there are currently good solutions for cast iron processing tools, cast iron cutters, etc.

2) Selection of chilled cast iron processing tools

When processing chilled cast iron, it is best to choose tool materials with high hardness, good wear resistance and certain toughness. Typically, fine or ultra-fine grain coated YG carbide or alumina ceramic tools are used.

3) Milling cutter cutting quantity for chilled cast iron processing

Carbide cutting tools; low speed and high feed. V=9m/min, the feed amount is generally selected according to the main deflection angle and the backcut amount. Choose 0.5mm/r for rough machining of cast iron and 0.1~0.4mm/r for finishing of cast iron.

Ceramic cutting tools; generally choose high speed milling, V=50~80 m/min for raw and semi-finished iron, V=80~120 m/min for finishing.

Cast iron machining tools, such as blades, can be rough, semi-finished and finished. If you still don’t know which cutter to use for cast iron, of course you should choose YG type carbide cutters for cast iron processing.