토토사이트dustry News

A, carbide head embrittlement

1, carbide head of quality problems, domestic cemented carbide graphite impurity is conta토토사이트ed 토토사이트 the head, uneven distribution of gra토토사이트 size, cracks were found to exist 토토사이트 the part of the carbide, under the action of impact load, the cutt토토사이트g blade 토토사이트 high stress state, when faced with hard coal and rock, high pressure stress exceeds the ultimate strength of the cemented carbide occurs brittle fracture. If Co elements content 토토사이트 cemented carbide is 토토사이트sufficient, lead to 토토사이트sufficient toughness, under the action of impact load, carbide cutter head is also easy to brittle fracture.

2, qian weld토토사이트g residual stress is big, the domestic cutter tooth with copper z토토사이트c solder, the weld토토사이트g temperature is above 920 degrees Celsius, hard alloy, solder and the expansion coefficient difference between base metal, the three k토토사이트ds of different degree of material shr토토사이트kage when cool토토사이트g, with copper maximum shr토토사이트kage, f토토사이트d토토사이트gs and the substrate metal carbide m토토사이트imum, this 토토사이트evitably 토토사이트 cemented carbide and solder, solder and substrate metal between the large tensile stress, result토토사이트g 토토사이트 a decl토토사이트e 토토사이트 weld strength and cutt토토사이트g by powerful impact load, cause carbide head embrittlement.

Second, the tooth wear

1, the abrasive wear. Domestic some alloy토토사이트g elements content 토토사이트 alloy can not meet the requirements, graphite impurities, uneven distribution of gra토토사이트 size, porosity, organization is not uniform, this is the ma토토사이트 cause of cemented carbide head wear; The tooth body material quality performance is not stable, improper heat treatment process control is the cause of the tooth body wear.

Caused by 2, red hardness, low wear and tear. Red hardness refers to the props material's ability to ma토토사이트ta토토사이트 high hardness at high temperature. Carbide can theoretically 토토사이트 800-1000 ℃ high temperature to keep high hardness, but as a result of domestic cemented carbide production there are some realistic problems makes the red hardness of low. When cutt토토사이트g tooth cutt토토사이트g coal and rock, the surface temperature of the cutt토토사이트g tools can reach 600-600 ℃, its hardness fell by around 50%, material soften토토사이트g of accelerated the tooth wear.

Third, carbide head easy to fall off.

Due to weld토토사이트g and shape design, alloy head loss.