Carbon steel is the “main†material in the metalworking industry and the most steel grade ever processed. About 87% of the steel produced in the United States is carbon steel. The feasibility of using carbon steel depends on whether its mechanical properties (such as tensile strength, yield strength, fatigue strength, impact resistance, and required heat treatment) are suitable for the manufacture of a part. If the characteristics of carbon steel can meet the requirements of the parts, most users will choose carbon steel because its price is cheaper than other steels. The purpose of this paper is to help users who process carbon steel parts understand the composition of various carbon steel grades to improve the turning efficiency. At the same time, the cutting speed parameters related to depth of cut and feed rate and the hardness of tool materials and carbon steel are also given. . As early as 66 years ago, M. Eugene Merchant and Dr. Hans Ernst, pioneers in the field of metal cutting, have explained the formation of chips, the friction between chips and tools, surface quality and metal removal efficiency. In the study, Dr. Merchant used a variety of metal materials, including 1020 low carbon steel and 1112 easy cut steel. Based on a large number of experiments, Dr. Merchant has established a mathematical model of the metal cutting process that has been used to date and can be used to design tool breakers. Carbon steel is divided into six categories: low carbon steel, medium carbon steel, high carbon steel, re-vulcanized easy-cut steel, re-vulcanized and re-phosphorus easy-cut steel and non-sulfide high manganese steel (manganese content exceeds 1%). (1) Low carbon steel Low carbon steel (AISI 1005 ~ 1026) has a carbon content of 0.06% to 0.28%, a manganese content of 0.25% to 1%, a phosphorus content of not more than 0.04%, and a sulfur content of not more than 0.05%. There are currently 16 standard grades for low carbon steel. When turning low carbon steel, if the cutter chip breaker does not form a large enough shear angle to curl the chips away from the rake face of the insert, long chips will be generated and a built-up edge will be formed on the surface of the indexable insert. Low-speed cutting is another cause of built-up edge. The built-up edge will act as a tool extension, which will change the size of the part and deteriorate the surface finish of the machined surface. In this case, the cutting speed needs to be increased by 15% to 20% or more until the surface quality is improved. Next page Led Pixel Light,Smart Pixel Light,Full Color Rgb Led Pixel Light,Waterproof Smart Pixel Light Shen zhen SH LED Technology Co.,Ltd , https://www.pixellightsolution.com
By setting the average processability of AISI 1212 free-cutting carbon steel to 100%, the percent workability of iron and non-ferrous alloy materials can be expressed as a percentage. With AISI 1045 medium carbon steel as the standard workpiece material, the turning test can be carried out under the specified cutting conditions to determine the service life of various grades of indexable inserts.