Electric tools are mass-produced products. Of course, the demand for parts is very large. Based on the unique advantages of powder metallurgy, they can also improve efficiency and production costs in electric tools, so they are widely used. The PM metal parts in common electric tools include cams, rods, counterweights, bearings, bearing seats, brush holders, clutches, rotors, cylinder blocks, end caps, blades, chucks, etc. These are all parts developed by powder metallurgy technology. Here are some representative parts manufactured by powder metallurgy technology and related problems.

1. Electric drill gear

The design of the gear train is determined according to the power and service life of the electric drill, so as to confirm that the strength and hardness of each gear match the required safety factor. Select according to common gear materials: 6.4-6.8g/cm ³ The density of carbon steel can be increased to 7.3 g/cm after secondary pressing and sintering ³。 In addition, nickel steel can be used to meet the application of high impact load. In addition to the selection of materials, the gears can also be designed as helical cylindrical gears, with the cooperation of spur gears, and FN series materials can be used to complete the performance of motor gears.

2. Battery type electric drill ratchet assembly

The ratchet of the battery-type electric drill gear box in the electric tool. This ratchet design won the excellent prize in the MPIF powder metallurgy design competition in the United States. The product is produced by Taiwan Porite Ltd, and the component is composed of hub, flange and ratchet. These parts were originally produced by forgings. After being changed to powder metallurgy parts, the production cost was reduced by 30%. The density of powder metallurgy flange and ratchet is 7.1g/cm ³， The tensile strength is 1000MPa, and the fatigue strength is 379Mpa The density of hub is 7.0g/cm ³， The tensile strength is 689Mpa, and the fatigue strength is 290Mpa