Finishing with a mosaic in the  Honing Process  Whetstone ( also known as honing ) conducted on the finished surface . Also known as boring mill. Main processing straight honing diameter of 5 to 500 mm and even larger variety of cylindrical bore hole depth and diameter ratio of up to 10 or more. Under certain conditions , can also be processed flat outer surface , a spherical surface, the tooth surface and the like. The outer periphery of the honing head set with a length of about 2 to 10 holes Whetstone length of 1/ 3 to 3 /4 , when the rotational motion of both the hole and honing the reciprocating movement of the honing head through the same spring or hydraulic control and uniform outer rose , Therefore, the contact surface area of the hole is large, a higher processing efficiency. Honing the bore size accuracy grade IT7 ~ 4, the surface roughness of up Ra0.32 ~ 0.04 m. Honing margin size , and pore size depends on the workpiece material , cast iron is generally 0.02 to 0.15 mm , the steel of 0.01 to 0.05 mm . Honing head speed is generally from 100 to 200 r / min , the speed of the reciprocating movement is generally 15 to 20 m / min. Was rushed to the chips and abrasive , improve surface roughness and reduce the cutting zone temperature , the operation often requires large amounts of cutting fluids, such as adding a small amount of spindle oil or kerosene inside , sometimes with extreme pressure emulsion.

Steel flat Honing Process  chamfering machine toughness and fatigue strength
Trends in the development of large-diameter pipes, high strength. With the increase of the diameter of the pipe, the steel grade increases, the greater the ductile fracture tip steady expansion trend. According to the test showed that the U.S. research institutions, spiral welded pipe and Longitudinal although the same as a level, but spiral welded pipe with high impact toughness.
Transmission pipelines due to the amount of change in the actual operation, the pipe is subjected to random alternating load effect. Learn down low cycle fatigue strength of steel edge machine, judging the life of the pipeline has important significance.
According to the measurement results, steel flat head chamfering machine fatigue strength of spiral welded seamless and ERW pipe with the same data in the test tube with a seamless and resistivity distribution in the same area, and submerged arc welded pipe than the average higher .