Introduction: With industrial development, different specifications of the crank slider mechanism are applied to more machinery. It is in the machinery manufacturing industry and other industrial production of more and more significant role, such as in automobile, agricultural machinery, electronics, medical equipment, defense, aerospace and industrial sectors and other daily necessities have a wide range of applications. Thus increasing the degree of automation machinery, reduce labor intensity and improve working conditions are inseparable from the study of slider-crank mechanism. Slider-crank mechanism is important in the press within the main body. The late nineteenth century there was considerable size crank press. Early twentieth century, the rise of the automobile industry, crank press has been rapid development. In recent years, electronics, communications, computers, home appliances and automotive industry rapid development of the rapid growth in demand for stamping parts. Both size and shape tend to standardization and serialization of the functional stampings, production volume growing (such as small and medium silicon steel stator and rotor motor, high pressure device silicon steel, razor, (IT-chip, etc.), in order to reduce costs and improve labor productivity, these parts are suitable for high-speed presses for mass production;In 1910, the U.S. companys first four columns at the end of Henry Pratt transmission structure of the press, so far, nearly 100 years of history, until the press today is the development ofthe most prosperous period. Speed presses constantly being refreshed, such as Nidec Beijing profits MACH-100 ultra-high speed precision press. Chinas accession to WTO, the accelerated pace of globalization of markets, competition has become intense harsh, so the industry on the proposed high precision stamping parts, good quality and low cost, higher requirements.First, the classification and model of crank press:Presses, including hydraulic and mechanical drive of the press, forging machine is divided into mechanical presses, hydraulic presses and other eight categories, Forging machines in the eight categories, each divided into ten categories, each column was divided into ten groups. The main parameters and the basic model the same, but different secondary parameters and basic model, called variant, the class code to add a letter after the letter A, B, C . ., in turn, said first, second, third variant . Crank press models with Chinese phonetic alphabet, letters and numbers that, for example, the meaning of JC23-63A model is:J C 23-63 A structure and performance improvements over the first prototype made 630kN (main parameters) The third group of the second column, two column tilting press open minor and basic models of the different parameters of the third variantRepresentation model now described as follows:First letter of the code for the class, with the Pinyin letters.The second letter represents a variant of the same model sequence number.Third and fourth figures were out, the group code.Horizontal line behind the figures represent the main parameters. Nominal pressure presses for general use as the main parameter.The last letter represents the product structure and performance improvements in the order number.Some of forging equipment, immediately following the column, the group behind the code and a letter, on behalf of the general characteristics of equipment.Second, the press of the working principle and structure:Figure of a drive crank pressThe figure: 1 - Motor 2 - pulley 3,4 - Gear 5 - Clutch 6 - connecting rod 7 - slider Motor driven pulley system 1 2 will spread to the small power gear 3, through the small gear 3 and gear 4 meshing will spread to the crank shaft power, and then use the rotation of the crankshaft rotation into reciprocating linear motion of the slider 7.Brake and clutch are mounted on the crank shaft, the motor does not cut off the power supply situation, and stop moving the slider switch control through the manipulation of clutch and brake to achieve. When the brake Brake, Clutch, it will drive connected with the crank, power input, the slider movement; When you need to stop the movement of the slider, the clutch will disengage the transmission and crank the same time, inertia brake is the brake effectively, so that the slider motion in time to stop.Third, the main technical parameters of crank pressThe main technical parameters should reflect the presss ability to work, workpiece size can range of indicators on productivity and otherThe main technical parameters are:Nominal pressure Fg (kN) and nominal pressure stroke Sg (mm). Nominal pressure of Fg: refers to the slider from the lower dead point to a specific distance (called the nominal pressure stroke Sg) when the slider al