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.