Technical requirements of the fourth shaft:
1. Basic requirements: the journal shall be in uniform and close contact with the fourth shaft, and there shall be a certain fit clearance.
2. Contact angle: refers to the central angle of the circle opposite to the contact surface of the journal and the fourth shaft. The contact angle shall not be too large or too small. If the contact angle is too small, the pressure of the fourth axle will increase. If it is serious, the fourth axle will be deformed greatly, accelerating wear and shortening service life; If the contact angle is too large, the formation of oil film will be affected and good liquid lubrication will not be obtained.
3. Contact point: the actual contact between the journal and the fourth shaft surface can be expressed by the actual contact points per unit area. The more, thinner and more uniform the contact points, the better the scraping of the fourth shaft is; on the contrary, the worse the scraping of the fourth shaft is. Generally speaking, the finer the contact points are, the more difficult the scraping is.
Functional characteristics of the fourth axis:
The fourth axis is an important part of CNC machine tools. Its high accuracy and automation features make it widely used in industrial processing. More and more factories are using the fourth axis for processing.
The fourth shaft adopts the air pressure brake locking mode. The high-precision cross ball bearing increases the locking force to ensure the cutting resistance. The high-precision double lead worm gear has high transmission and positioning accuracy, and the backlash is easy to adjust. It can be connected with the CNC machine to rotate the shaft or processed with a single axis controller.
The fourth axis has many advantages. In the process of industrial production, the vibration amplitude is small and the noise is low. The finished products are highly accurate and reliable. In addition, the service life of the fourth shaft is very long. As long as the maintenance is in place, it can be used for a long time without worrying about safety.