The influence of the change of the comprehensive radius of curvature of the gear on the dynamic pressure oil film of the gear exists. In fact, the lubrication of the gear during the meshing process is unsteady. In general, in gear transmission, rolling is advantageous for forming a dynamic pressure film, and wear is small; and sliding can produce a dynamic pressure oil film under certain conditions. The formation of dynamic oil film is an important condition for delaying gear wear.
The influence of various factors on the lubrication of the gears in the contact area between the meshing teeth, the lubricant molecules adsorbed on the surface of the gear teeth are drawn to the entrance of the contact zone, where the downhole drills the pressure due to the gathering of the tooth surfaces. The viscosity of the lubricant increases as the pressure increases, thereby facilitating the entrainment of the lubricant into the contact zone to form a dynamic oil film, and a complete lubricant film maintains the tooth surface of the gear in a good lubrication state. The thickness of the hydrodynamic oil film is related to the rotational speed of the gear 1 and the comprehensive curvature radius of the meshing tooth surface, and also related to the mechanical properties of the gear material, the surface roughness and the viscosity of the lubricating oil, and the elasticity of the tooth material. The impact of the load is relatively small.
Due to the large stiffness of the oil film, it is not sensitive to the load. The increase of the load only increases the elastic deformation of the tooth surface and the width of the contact area, and does not reduce the oil film thickness. General overload and bending failures are independent of lubrication, while pitting and gluing are affected by lubrication. Pitting is a phenomenon of fatigue. If the gears work for a long time, pitting will occur even under low stress. In order to improve the resistance of the gear to pitting, it is necessary to make the gears have low contact stress, high material strength and a large oil film thickness of the lubricant. Some geometric variables, such as diameter, tooth width, number of teeth, pressure angle, etc., can be optimized to reduce contact stress. The specific thickness of the oil film is an important parameter affecting the micro-contrast.
Sheet metal fabrication processing is formed by laser cutting or stamping process, shear and bending, bending, bending, welding, riveting. The Sheet metal fabrication used are cold-rolled plate (SPCC), hot-rolled plate, galvanized plate (SHCC) (SECC, SGCC), copper (CU) brass, copper, beryllium copper, aluminum (5052), stainless steel. Sheet metal fabrication processing steps: according to the parts drawing (3D) expanded into a plan (2D), laser cutting or die stamping shape, CNC punching each bending part, should pay attention to the direction of the burr of the workpiece. Then the students are welded or riveted (some). Surface treatment after processing: electroplating, passivation, sand blasting (powder), anode treatment. Products are generally made for the connection and the outer cover. Applications in robotics, drone, communications, medical devices, industrial automation equipment.
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