Types and conditions of precision casting processing gears
The transmission of precision gears is the primary component of mechanical equipment, with the functions of transmitting power and changing speed.
Types of precision gears: According to the relative orientation of the gear transmission axes, they can be divided into three categories-parallel axis transmission, intersecting axis transmission and staggered axis transmission.
Gears with parallel axis transmission include spur gears, helical gears and herringbone gears.
Functions and types of precision gear processing
1. The primary processing surfaces of precision gears are tooth surfaces and gear reference surfaces. Precision gear processing includes reference holes of gears with holes, equipment end faces during precision gear processing, and tooth top cylindrical surfaces used for locating the orientation of gear blanks or measuring tooth thickness as a measurement reference.
2. Materials and blanks of precision gears
Commonly used precision gear materials for precision gear processing include carbon structural steels such as 15 steel and 45 steel; precision gears with high speed, high force and high precision often use alloy structural steels, such as 20Cr, 40Cr, 38CrMoAl, 20CrMnTiA, etc.
The blank of precision gears is determined by the gear material, structure, size, application conditions and production batch. Commonly used are bar stock, forging blank, cast steel or cast iron blank, etc.
In the process of drilling water glass alloy steel casting gear processing, these advanced blank forming processes, more stable and high-precision heat treatment processes, and especially suitable surface hardening process treatment are all the primary conditions for the final production of gear classics. For example, there are several important steps in the grinding process: only by using a grinding wheel with a sharp blade and a small ground stress on the grinding surface, the grinding speed can be increased, thereby reducing the grinding time. This is to improve the grinding efficiency and increase the interval of grinding wheel dressing to control costs.
The design of water glass precision castings is the key factor and the starting and ending process of precision castings. For gear forging, the design is also its key factor. It is related to the quality and level of the cast gears. In the design, selecting the most suitable forging gear materials, carrying out excellent and effective overall design, and using efficient and reliable gears and bearings are indispensable stages.
Under the premise of ensuring no grinding scald cracks and ensuring quality and quantity, it is necessary to use higher grinding parameters as much as possible to reduce the grinding time, thereby improving the grinding efficiency and improving the benefits. It is also necessary to ensure its precision and reduce surface roughness. By using more suitable grinding oil, it can be ensured that under the premise of good lubrication and rust prevention, it is also helpful to reduce the stress on the surface of the grinding journal, prevent scald cracks, reduce surface roughness, reduce the degree of blocking the grinding wheel vent, and ensure the sharpness of the grinding wheel, which reduces the grinding wheel repair, reduces the use of grinding wheels, and controls costs.
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