Tool steel refers to a variety of carbon steel and alloy steel that are particularly well-suited to be made into tools. Their suitability comes from their distinctive hardness, resistance to abrasion and deformation, and their ability to hold a cutting edge at elevated temperatures.

Grain sizes for grinding tool steel are generally in the range 24-100 mesh.

Coarse grain izes are used for rapid rate of remo val, when grinding large workpieces, grinding softer materials or when the contact surface of the grinding whee is large. Fine grain sizes are used to oroduce high surface finish, when grinding hard materials or when the contact surface of the grinding whee is small. The surface smoothness of the ground part depends not only on the grain size of the grinding wheel. The sharpness of the wheel, the bonding material used and the hardness of th wheel also play a considerable part ir determining the surface finish produced.

1. Linear velocity of grinding wheel

The circumferential velocity of grinding wheel and parts can directly affect the grinding efficiency.

The grinding wheel linear velocity is generally between 30-40 m/s when grinding the surface of the outer circle coating.

When grinding the surface internal grinding, the grinding wheel linear velocity is generally between 18-28 m/s.

The linear speed of the workpiece is based on the size of its diameter, generally chosen between 25-40 RPM.

Different components:

1. CBN insert: Artificial cubic boron nitride cutting tool, at high temperature can also maintain the characteristics of high hardness, mainly for processing iron parts.

2. Ceramic insert: Metals or nonmetals combined with oxygen (O), nitrogen (N), carbon (C), and other elements are called ceramics. After sintering, it can be used as a cutting tool.

Comprehensive analysis:
A total of 100 units were tested. The first 7 units were tested to the limit. The maximum load of the machine was set at 25%.
After the sharpening, the load of the machine tool can be reduced, the grinding force of the grinding wheel can be maintained, and the outer diameter of the grinding wheel does not change much. In conclusion, the hardness of the grinding wheel is hard, the grinding wheel is easy to block holes, and the grinding wheel maintainability is good.

Diameter of the grinding wheel is too large, the contact arc between the grinding wheel and the workpiece will increase, which will increase the grinding heat and make cooling and row cutting difficult. If the diameter of the grinding wheel is too small, it is difficult to achieve the ideal grinding speed (30m/s~50m/s), which increases the grinding thickness, increases the conformity of the grinding grains, and is easy to blunt, which increases the surface roughness of the inner hole and reduces the production efficiency when grinding the hole of workpiece.

Usually, as customer said “anything” is not changed, same grinding wheel, same work piece, same grinding machine, same stuff and same grinding condition. We think they change a very small thing “feeding speed”. Because they want to improve the grinding efficiency, increase the feeding speed is an easy way.
However, if increase the feeding speed too much, it makes grinding wheel wears out very quickly. The grinding efficiency is improved, but grinding wheel wears too fast. We recommend customer choose a reasonable feeding speed. That’s not a big problem, but it makes your production cost increased.