Powder Metallurgy Gears

Abstract

This article describes the capabilities, limitations, advantages, and disadvantages of the powder metallurgy (PM) gear manufacturing process. It discusses the types of gears that can be produced by PM and presents the design guidelines for PM gears. The article provides information on gear tolerances and performance of PM gears. It also explains various procedures to inspect and test the mechanical properties, dimensional specifications, and surface durability (hardness).

Using powder metal gears in industrial applications- A review

“…As shown in the figure, surfacedensified PM gears have an endurance limit of around 1764 MPa as compared to 1839 MPa for the hobbed gears. The difference in fatigue life, below 5 per cent in this case, makes the surfacedensified gears a good and applicable alternative to the ordinary hobbed gears with respect to performance in applications of high contact stress [17].…”

“…A comparison of the contact fatigue of hobbed wrought steel gears and surface-densified gears using a powder metallurgy process is presented in Fig. 3 [17]. As shown in the figure, surfacedensified PM gears have an endurance limit of around 1764 MPa as compared to 1839 MPa for the hobbed gears.…”

“…The possibility of compacting a helical gear with a 33 o helix angle using conventional alloy steel powders is proofed at a density close to 7.2 g/cm3. In addition to compaction complexity in PM production and the difficulties of high core density, PM gear blanks should get deep surface densification in order to maximize the strength in the root fillet and on the active tooth surfaces [17].…”

“…density [14] Fig. 3 Contact fatigue of surface-densified PM gears and broached gears [17] Fig. 4 Schematic view of the experimental apparatus [18] Noise and vibration NVH characteristics In the new era of electrification in the automotive industry, reducing the generated noise from gearboxes is of high importance since the noise of the gearbox is no longer masked by the combustion engine.…”

W-Cu Nano-Composite Powders Prepared by Hydrothermal Method

“…W-Cu alloy is a pseudo-alloy consisting of W and Cu, which has common good qualities of W and Cu, such as excellent electrical and thermal conductivity, high strength, extreme hardness and low thermal expansion coefficient. As a result, W-Cu composites have been widely applied in heat sink material, electric contact material, Electrical discharge machining material, high-temperature structural material, arc resistance of electrode material and heavy electrical contact material [1][2][3][4][5] . The traditional method of fabricating W-Cu alloy is infiltration process.…”