Why Do Roadheader Picks Have Cold Cracks?

The wear rate of the picks is high, and cold cracks may occur during operation. Learn why the picks of the lower roadheader have cold cracks!

The reasons for cold cracking of incisors are as follows.

1. The carbon content of brakes is very high. During the manufacture of brakes, alloying elements all increase the relative hardening ability.

2. The welding process is not good. Hydrogen is present in the weld during welding and does not diffuse immediately, so the hydrogen accumulates in the metal and generates greater stress, resulting in cold cracks.

3. The welding thickness of the pick does not meet the standard, the welding rigidity is large, and the welding bonding force increases.

4. Since the cutting teeth cannot be uniformly heated and cooled during welding, the cutting teeth are also prone to cold cracks.

Poor wear resistance

Wear resistance refers to the wear resistance of alloy tool tips and tooth tips. Domestic stop alloys generally have high cobalt content, incomplete structure, low density, and low hardness, so the tool tip wear resistance of stop alloys is poor. Due to the unstable quality and performance of raw materials and improper heat treatment process of the pick, the pick head has cracks and low hardness, which affects the wear resistance.

In view of the shortcomings of the existing technology, the technicians provide a new type of pick that is sharper, has higher wear resistance, longer service life, and can be replaced in time after the cutter head is damaged. In order to achieve the above purpose, it adopts the following technical scheme: a pick, including a cutter head, a pick body and a pick seat, the pick body is provided with a mounting portion for mounting the cutter head, and the mounting portion is in the shape of a truncated cone The upper end face of the installation part is provided with an installation groove, and the installation groove is conical; the side wall of the installation groove gradually tapers from the open end of the installation groove to the bottom of the installation groove along the central axis. The cutter head is provided with an installation block matched with the installation groove, the outer surface of the installation part is provided with four strip-shaped grooves, and the strip-shaped grooves are gradually reduced from the direction of the pick seat to the direction of the cutter head; An annular groove arranged in the center; two fixing rings arranged with a gap are arranged on the pick seat.