The appropriate cutting speed depends on the depth of cut, the feed rate, the tool material and the hardness of the workpiece. Choosing cutting speed is a challenging task. In general, the depth of cut and feed rate parameters can be pre-selected conservatively based on machining accuracy requirements (roughing, semi-finishing, or finishing). The cutting speeds used to process low carbon steels are slightly different and can be divided into two groups. The typical low carbon steel roughing, semi-finishing and finishing cutting parameters are shown in Table 1 and Table 2. (slightly) The data in the table shows that the cutting speed decreases as the depth of cut and feed rate increase. If the depth of cut, one of the feedrates (or both) is different from the data in the table, the cutting speed needs to be adjusted so that the metal removal rate (mrr) calculated according to the cutting parameters in the table remains unchanged. The calculation example is as follows. The metal removal rate of the first row of cutting parameters in Table 1 is: Mrr=12′′×sfm×DOC×ipr=12×550×0.300×0.020=39.6in.3/min If the depth of cut is reduced to 0.200", to keep the metal removal rate constant, the cutting speed must be equal to 825sfm, ie: Sfm=mrr÷DOC÷ipr÷12=39.6÷0.200÷0.020÷12=825sfm In this example, the cutting speed increases in the same proportion as the depth of cut decreases (0.300 ÷ 0.200 = 1.5, 550 × 1.5 = 825 sfm). (2) Medium carbon steel Medium carbon steel (AISI 1029 ~ 1053) has a carbon content of 0.25% to 0.55%, a manganese content of 0.30% to 1.00%, a phosphorus content of not more than 0.04%, and a sulfur content of not more than 0.05%. Medium carbon steel has 16 standard grades, and its cutting parameters are shown in Table 3. (slightly) When turning medium carbon steel, it will produce discontinuous chips. The surface quality of the machined surface is better than that of low carbon steel, but the cutting force and tool wear will increase with the increase of carbon content and hardness. Therefore, when the hardness of the workpiece increases, the cutting speed should be reduced. (3) High carbon steel High carbon steel (AISI 1055 ~ 1095) has a carbon content of 0.60% to 1.03%, a manganese content of 0.30% to 0.90%, a phosphorus content of not more than 0.04%, and a sulfur content of not more than 0.05%. There are 14 standard grades for high carbon steel, and the cutting parameters are shown in Table 4. (slightly) Previous Next U-Bolt, namely horseback bolt. It is a non-standard part. It is named because of its U-shape. It has threads at both ends and can be combined with nuts. It is mainly used to fix tubular objects such as water pipes or sheet objects such as car leaf springs. Because it fixes objects in the same way as people ride on a horse, it is called horseback bolt. U-Bolt,Square U Bolts,U Bolt Plate,Stainless Steel U Bolts Jiangsu Jiajie Special Screw Co., Ltd , https://www.tzbolts.com