Early honing the Honing Sticks in the automotive industry is to solve the problem of hole machining . Early boring tools and machine tool machined surface of the cylinder wall washboard phenomenon exists . Cylinder wall surface and good sealing between piston rings , piston rings are not suitable for lubrication , it will quickly wear the engine first group ring . Finally, in a very short period of time it must be replaced piston rings. Rough boring out of the cylinder wall causes the piston skirt wear serious , requiring trimming process . Piston ring in metal impurities also cause damage. As the piston reciprocates in the cylinder bore , piston ring wear in addition to the fine irregular cylinder wall protruding points . The removal of metallic particles down lubrication system , the filter plug and the cylinder wall in the vertical direction cause scratches. Impurities will scratch the piston skirt . The second reason is scratched poor lubrication. As subtle protruding point before they are polished , where the higher projections point to the cylinder walls painted in lubricating film punctured . When the piston stroke in the entire encounter these projections point occurs when the metal to metal contact between the piston speed reached its lowest point . Short life of piston rings , the piston skirt and the cylinder bore wear scratches are of the piston reciprocating in a cylinder bore rough caused to run , is inevitable, which leads to the engine fuel consumption , low efficiency . Even so , the earlier car have to use this engine .
Embedded in the head with a Honing Sticks ( also known as honing ) for finishing the surface finishing process . Also known as honing . The main processing straight honing diameter of 5 to 500 mm and even larger variety of cylindrical holes , hole depth and diameter ratio of up to 10 or greater. Under certain conditions , also can be processed flat , cylindrical surface , spherical surface, such as tooth . Honing head set with the outer peripheral length of about 2 to 10 holes in 1 /3 to 3 /4 of the stone, honing holes in both rotary motion and reciprocating motion , and the honing head through the spring or hydraulic control of the external uniform rise, Therefore, the contact surface area of the hole is large, the processing efficiency is high. Honing accuracy of hole size IT7 ~ 4 level, surface roughness up Ra0.32 ~ 0.04 microns. Honing margin size , pore size and workpiece material depends , generally cast iron 0.02 to 0.15 mm, the steel of 0.01 to 0.05 mm. Honing head speed is generally 100 to 200 r / min, the speed of movement is generally from 15 to 20 m / min. Was rushed to the chips and abrasive , to improve surface roughness and reduce the cutting zone temperature , the operation often requires large amounts of cutting fluid, such as kerosene or add a small amount within the spindle oil, sometimes with extreme pressure emulsion.