各种齿轮的制造法可分为冶加工和热加工两大类。冷加工有铣齿、滚齿、插齿、铲齿、磨齿等,精密度可达到(?)3～(?)12,完全可做到符合图纸要求,但产量较低,成本较高。热加工有热轧法或精密铸造法(壳模铸造、压铸)和砂型铸造法。前者是近年发展起来的新技术,精密度可达(?)3～(?)6,产量较高,成本较低,但目前 The manufacturing method of various gears can be divided into metallurgical processing and thermal processing two categories. Cold milling with hobbing, hobbing, gear teeth, shovel teeth, grinding teeth, precision can be achieved (?) 3 ~ (?) 12, fully meet the requirements of the drawings, but lower yields and higher costs. Hot-rolled hot-rolled or precision casting method (shell casting, die-casting) and sand casting method. The former is a new technology developed in recent years, the precision up to (?) 3 ~ (?) 6, higher yield, lower cost, but at present