The quality and accuracy of CNC cutting machine are partly affected by its processed parts. In this article, we will understand why CNC cutting machine chooses square rail and 5 kinds of motor transmission methods;
1. Why does CNC cutting machine choose square rail
CNC cutting machine uses square rails with high positioning accuracy and good reproducibility. The rolling motion method of the linear Rail has a small friction coefficient, and the gap between static friction and dynamic friction is very small. Even when feeding, there will be no idling slip phenomenon. The analytical ability and reproducibility are good, so it can achieve μm positioning accuracy. Low friction resistance can maintain accuracy for a long time. It can bear the high load capacity of CNC cutting machine in four directions. The geometric mechanical structure design can bear radial, reverse radial and transverse loads at the same time and maintain the walking accuracy. At the same time, it can be easily applied to the preload and the slider Quantity can increase performance and load capacity.
2. Five transmission modes of CNC cutting machine motor
The commonly used motor transmission for CNC cutting machine of Anna Solution Technology Co., Ltd. is gear transmission. Its transmission is accurate, stable and long in use. In fact, there are several other motor transmissions. Let’s take a brief look:
1. Gear transmission classification: plane gear transmission, space gear transmission. Advantages: Applicable peripheral speed and power range are wide; transmission ratio is accurate, stable and efficient. High working reliability and long life. It can realize the transmission between parallel shafts, arbitrary angle intersecting shafts and arbitrary angle staggered shafts. Disadvantages: higher manufacturing and installation accuracy and higher cost. Not suitable for long-distance transmission between two shafts. The names of the basic dimensions of involute standard gears are addendum circle; tooth root circle; index circle; touch number; pressure angle, etc.
2. Turbine worm drive is suitable for the movement and power between two shafts where the space is vertical and not intersecting. Advantages: large transmission ratio. Compact structure size. Disadvantages: large axial force, easy to generate heat, and low efficiency. Only one-way transmission is possible. The main parameters of the worm gear drive are: modulus; pressure angle; worm gear index circle; worm index circle; lead; number of worm gear teeth; number of worm heads; transmission ratio.
3. The belt drive includes the driving wheel and the driven wheel; the endless belt 1) is used for the occasions where the two axes are parallel to the rotation direction, which is called the concept of open movement, center distance and wrap angle. 2) The belt type can be divided into three categories: flat belt, V belt and special belt according to the cross-sectional shape. 3) The focus of application is: calculation of transmission ratio; stress analysis and calculation of belt; allowable power of a single V belt. Advantages: suitable for transmission with a large center distance between two axles; belt has good flexibility, can alleviate impact and absorb vibration; slip when overloaded to prevent damage to other parts; simple structure and low cost. Disadvantages: the outer size of the transmission is large; a tensioning device is required; due to slipping, a fixed transmission ratio cannot be guaranteed; the belt life is short; the transmission efficiency is low.
4. Chain transmission includes driving chain, driven chain and endless chain. Compared with gear drive, chain drive has its main features: lower manufacturing and installation accuracy requirements; when the center distance is large, its transmission structure is simple; the instantaneous chain speed and instantaneous transmission ratio are not constant, and the transmission stability is poor.
5. Gear train 1) The gear train is divided into two types: fixed axle gear train and epicyclic gear train. 2) The ratio of the angular velocity (or rotational speed) of the input shaft to the output shaft in the gear train is called the transmission ratio of the gear train. It is equal to the ratio of the product of the number of teeth of all driven gears in each pair of meshing gears to the product of the number of teeth of all driving gears. 3) In the epicyclic gear train, the gears whose axis position changes, that is, the gears that both rotate and revolve, are called planetary gears, and the gears with fixed axis positions are called center gears or sun gears.
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