Machining process of engine connecting rod

The invention discloses a machining technology of an engine connecting rod. The machining process comprises the following steps: forging, blank making and cutting, and taking high carbon non-hardened steel as a raw material; main procedures of the forging and blank making: blanking, heating, blank making, blocker forging, finish forging, trimming, punching, normalizing after shaping, and forced cooling in a forced cooling mode so as to reduce the temperature of a forging parts below 600 DEG C in 10min; cutting after defect detection and powerful shot blasting; the main procedures of the cutting: coarsely grinding or milling two end faces, roughly boring a big head pore and a small head pore, drilling and tapping a bolt hole, and cutting and machining a cracking tank on the big head pore of the connecting rod by cracking tank machining equipment; putting the connecting rod into the cracking equipment for breaking due to expansion, and assembling bolts; and finely grinding the sides of the connecting rod, finely boring the big pore and the small head pore, washing and checking. The technical proposal can help save time, reduce manufacturing procedures and improve assembly accuracy of the connecting rod.