Case of white corundum grinding wheel for grinding 45# steel

Grinding wheels are also called bonded abrasives. Grinding wheels are bonded abrasives that bond ordinary abrasives into a certain shape (mostly round, with a through hole in the middle) and have a certain strength. It usually consists of abrasives, bonds and pores. These three parts are often referred to as the three elements of bonded abrasives.

Abrasive selection for grinding wheels

The most commonly used abrasives are brown corundum (A) and white corundum (WA), followed by black silicon carbide (C) and green silicon carbide (GC), and the rest are chromium corundum (PA), single crystal corundum (SA), microcrystalline corundum (MA), zirconium corundum (ZA).

Brown corundum grinding wheel

Brown fused alumina has high hardness and toughness. Suitable for grinding metals with high tensile strength, such as carbon steel, alloy steel, malleable cast iron, hard bronze, etc. The abrasive has good grinding performance and wide adaptability. It is often used to remove large amounts of kibble.

Brown fused alumina has the characteristics of high purity, good crystallization, strong fluidity, low linear expansion coefficient and corrosion resistance. White corundum has the characteristics of high purity, good self-sharpening, acid and alkali corrosion resistance, high temperature resistance, and stable thermal performance. In comparison, the hardness of white corundum is higher than that of brown corundum.

White corundum grinding wheel

The hardness of white corundum is slightly higher than that of brown corundum, and its toughness is lower than that of brown corundum. During the grinding process, the abrasive grains are easily broken. Therefore, the grinding heat is small, and it is suitable for manufacturing grinding wheels for grinding hardened steel, high-carbon steel, high-speed steel and grinding thin-walled parts, and the cost is higher than that of brown corundum.

White corundum has good cutting strength and a good polishing effect. White corundum abrasive wheel is mostly used in carbon steel, alloy steel, malleable cast iron, hard bronze, etc., while brown corundum is commonly used in the market, and is mostly used in hardened steel, high-speed steel, and high-carbon steel. etc.

Recently, Moresuperhard met a customer asking about ordinary abrasive grinding wheels. Let’s take a look at his needs:

Questions of customer:	Conventional abrasive grinding wheel for grinding 45# steel, mainly for grinding arcs and angles.
	The white corundum grinding wheel used before was first used to dressing the shape with a diamond roller. The consumption is too fast, and the effect is not very good if it is repaired frequently.
Size of white corundum grinding wheel	350x40x127 80#
Moresuperhard solutions：	R finally changed to 0.38
	1. White corundum+SG has good high-temperature retention
	2. White corundum Low temperature
	3. White corundum + brown corundum mixed abrasive

The first option is recommended first, the grinding wheel is durable and does not require frequent grinding. White corundum and brown corundum mixed abrasive wheels are also being tested, and in some cases, blended abrasives can enhance the shape retention of the wheel.

—EDITOR: Doris Hu, Jim Jiao

—-POST: Doris Hu