Spiral bevel gear is one of the most widely used gears at present. Its processing technology and related meshing theory have been relatively mature. The straight bevel gear used in industrial production is only affected by radial force in the process of transmitting motion, and the method of processing this kind of bevel gear is relatively simple, but the transmission noise of straight bevel gear is relatively large and the transmission is not stable enough. Spiral bevel gear has many advantages that straight bevel gear does not have, such as its compact structure, very stable transmission, low noise generated between a pair of gears during operation, and can bear a large load. It is suitable for various mechanical equipment with intersecting or staggered shaft transmission. Therefore, spiral bevel gear transmission is widely used both at home and abroad, And its transmission technology is also the research object of scholars at home and abroad.
The condition that a pair of spiral bevel gears can conjugate transmission correctly is that the tooth surface profile is spherical involute. The shape of spiral bevel gear is very complex and the regularity is difficult to find. During transmission, it depends on the gear surface contact of two gears, and the machining trajectory is complex. When cutting gears, it is necessary to calculate, adjust and test cut for many times to find out the appropriate parameters that meet the meshing requirements. In this way, the cutting process is complicated and lengthy, and the amount of calculation is quite large, so the operators are required to have a high level of relevant knowledge. There should be no mistakes in the calculation process, otherwise the previous achievements will be wasted. It takes a long period to process a pair of gears in this way, and the cost is also very high. Therefore, the processing of spiral bevel gears is time-consuming, laborious and expensive. At present, the manufacturing industry mainly uses the approximate tooth profile method to process spiral bevel gears, that is, the hypothetical equivalent cylindrical gear tooth profile on the back cone expansion plane is used to approximately replace the spherical involute tooth profile. It is easier to process and manufacture by this method, but the gears drawn by this approximate tooth profile method are not as good as expected, and the processed gears have poor interchangeability. Not only can it not be divided continuously in machining, but also the machine tool and auxiliary equipment are huge, and there are many specifications and quantities of cutting tools. Moreover, due to the application of the principle of flat top teeth, there are errors in machining itself.
The mechanical spiral bevel gear machining machine tool must coordinate the relationship between tool and workpiece through complex transmission system. Therefore, the processing industry increasingly requires the realization of high-speed, high-precision, digitization, flexibility and automation of production. With the rapid development of computer technology, digital control technology began to be applied to the processing and manufacturing industry of spiral bevel gears. Using numerical control technology, we can easily solve the problems encountered in previous machinery, and use high-precision numerical control transmission to replace the cumbersome transmission chain of old machine tools, so as to create a new method for the processing of spiral bevel gears.
Therefore, we propose to use numerical control technology to design spiral bevel gear machining machine tool. Compared with the ordinary spiral bevel gear processing machine tool, the NC spiral bevel gear processing machine tool has simple structure, high sensitivity of mechanical drive, good rigidity and high precision. It is controlled by program, easy to adjust and can improve work efficiency. It is an ideal NC processing equipment.