Abstract

The wear of the bits on a continuous mining machine is a problem that affects mine operators around the world. The fundamental problem (wear) still causes increase in the downtime of the equipment. One aspect, which has been surprisingly overlooked, is the heat developed on the bits during cutting that causes the wear of the bit. Numerical models of the Automated Rock and Coal Cutting Simulator (ARCCS) were developed using the ABAQUS. Two bit designs K-1M and K-2M were analyzed numerically and it was found that the effect of heat developed on the bit not only depends on the friction but also on the bit geometry. Forces developed during the rotary cutting showed that the sharper and the longer bit tips are more effective compared the regular conical bit tips.

1 Introduction
1.1 Background

Longwall and room-and-pillar methods of mining are the most popular method of extraction of the coal in the United States. These methods use versatile continuous mining machines such as the continuous miners and the shearers for the development and the production from the mine. Bits mounted on the continuous miner and shearer drums are the primary elements that are responsible for coal extraction. Additionally, both the continuous miner and the shearer are affected severely due to wear of bits.

Prominently the worn bits will result in:

  1. The downtime of the continuous miner.

  2. An inefficient cutting of coal.

  3. An increase in dust near the work area.

  4. Frictional spark and ignition of gas.

  5. An overall economy of the operator.

This content is only available via PDF.
You can access this article if you purchase or spend a download.