Solutions to common problems in the process of worm grinding wheel grinding gear processing:
The tooth shape should be symmetrical. Tooth shape processing is the key to gear processing, and the choice of its solution depends on many factors, such as equipment conditions, gear accuracy level, surface roughness, hardness, etc.
First, ensure the installation accuracy of the hob. The hob is installed on the mandrel of the gear hobbing machine. It is necessary to use a micrometer to check that the radial runout of the bosses at both ends of the hob is not greater than 0.005 mm. At the same time, it is necessary to move the position in time. When the hob is hobbing the gear, usually only the middle teeth cut the workpiece, so these teeth are easy to wear. In order to make the teeth wear evenly and extend the durability of the hob, after the hob cuts a certain number of gears, it can be moved along the hob axis by manual or motorized methods to increase the life of the hob.
Secondly, control the quality of hob grinding. Actively adopt hob grinding machines, which have the characteristics of high precision, low price, convenient and flexible operation. High-precision linear guides and precision indexing plates are used to ensure the accuracy of hob grinding. The independent worm grinding wheel dressing device and the spiral feed and tool setting device of the hob greatly improve the operational flexibility and the working efficiency of the hob grinding.
Third, check the installation and operation of the exchange gear. The exchange gear is a replaceable gear set used to change the cutting speed or feed rate (see cutting amount) of the machine tool, and can be used in an interchangeable position in the application.
By using exchange gears, the original up (down) speed transmission can be converted into down (up) speed transmission, and the transmission ratios are reciprocal. Therefore, in order to ensure the normal operation of the lathe, the installation and operation of the exchange gears must be checked in time. Gear grinding machines are essential processing equipment for high-precision gears and high-speed heavy-load gears. In the past ten years, the rear axle spiral bevel gear pair of automobiles (especially the arc shrinking gear transmission of the Gleason system) also requires a large amount of manufacturing equipment. After the arc shrinking gear spiral bevel gear is heat treated, the finishing process requires a gear grinding (or grinding) machine.
At present, the high-order shaping of worm grinding wheel gears is the development direction of gear shaping technology. Compared with traditional shaping methods, it has the advantages of low transmission error, large overlap, and small vibration. The finishing of high-order shaping gears mainly adopts the method of grinding, including forming method and development method. The forming gear grinding machine is mainly used for the finishing of large modulus gears, especially for the forming grinding and shaping of heavy-loaded and large modulus gears.
