1st classification based on the method of processing and the process used
1. CNC machine tools that are widely used
CNC machine tools are generally referred to as automatic machine tools that implement digital control in a processing technology process, such as CNC milling machines, CNC lathes, CNC drilling machines, CNC grinding machines, and CNC gear processing machines, among others.
Ordinary CNC machine tools are not completely automated; tool replacement and part clamping are still required to be done manually on these machines.
Machining center No. 2
It is a numerical control machine tool that includes a tool magazine and an automatic tool changing device. It performs the functions of a numerical control milling machine, a numerical control boring machine, and a numerical control cnc drilling service machine all in one machine. After the parts are clamped together, the majority of the processing surfaces can be processed in a variety of ways, including milling, boring, drilling, expanding, reaming, tapping, and other operations.
Because the machining center can effectively avoid the positioning error caused by multiple installation, it is well suited for products that require frequent product replacement, have complex part shapes, require high precision, are produced in small batches, and have a short manufacturing cycle.
2Classification of athletes according to sport
1. Control at a single pointCNC machine tool is an abbreviation for Computer Numerical Control.
This means that the CNC system only controls the precise positioning of the tool or worktable from one point to another and then performs fixed-point processing, with the path between points not being controlled. CNC drilling machines, CNC boring machines, and CNC coordinate boring machines all use this type of control.
2. Linear control of point positionCNC machine tool is an abbreviation for Computer Numerical Control.
Point position linear control refers to the fact that the CNC system not only controls the precise positioning of the starting point and end point of the linear trajectory, but it also controls the linear cutting between the two points at the specified feed rate. Point position linear control is also referred to as point position control. cnc turning service, CNC lathes, CNC grinders, and so on are all available.
3. Contour control is important. CNC machine tool is an abbreviation for Computer Numerical Control.
It is also referred to as continuous trajectory control because it has the capability of continuously controlling the joint motion of two or more coordinate directions.
The numerical control device has the function of interpolation operation, which makes the tool trajectory approach the specified contour curve with the least amount of error, and coordinates the movement speed of each coordinate direction, in order to maintain the specified feed speed throughout the curing process. This type of control is used in CNC milling machines, CNC lathes, CNC grinders, and machining centers, among other things.
3rd, classification based on the control mode
1. A control system with an open loop.
Control systems without a feedback device are known as open loop control systems, and they are composed of a stepper motor drive circuit and a stepper motor.
Through the control operation, the numerical control device sends out a pulse signal, and each pulse signal causes the stepper motor to rotate at a specific angle and drive the worktable to move a specific distance through the ball screw. This type of servo mechanism is relatively simple, stable, and simple to operate, but it has limited potential for improving accuracy and speed.
2. Control system with a semi closed loop
In the servo mechanism of the open-loop control system, an angular displacement detection device is integrated into the semi-closed loop control system. It indirectly detects the displacement of the moving parts by detecting the angle of the ball screw of the servo mechanism, and then feeds back to the comparator of the numerical control device to compare with the original command displacement value, and then uses the difference value after the comparison to control, so that the moving parts supplement the displacement. The precision, speed, and dynamic characteristics of this type of servo mechanism outperform those of the open-loop servo mechanism, which is used by the vast majority of small and medium-sized CNC machine tools on the market.
Control system with a closed loop
Closing the loop is a control system in which a linear position detection device is directly installed on the position of the moving parts in a machine tool, the actual displacement detected is fed back to the comparator of the numerical control device and compared with the original command displacement value input, and the moving parts are controlled by the difference value after the comparison is made
The positioning accuracy of a closed-loop control system is higher than that of a semi-closed-loop control system, but its structure is more complex, and it is more difficult to debug and maintain. As a result, it is frequently used in high-precision and large-scale CNC machines.
4th classification is based on the number of linkage axes present.
The CNC system directs the movement of several coordinate axes in a coordinated manner in accordance with the required functional relationship, which is referred to as coordinate linkage.
1. A two-axis linkage is used.
CNC machine tool can control two coordinate axis linkage at the same time, which makes it suitable for CNC lathe machining rotary surface or cnc machining services milling plane profile, among other things.
2-axis and half-linkage design
On the basis of two axes, the movement of the Z axis is added. When the X and Y axes of the machine coordinate system are fixed, the Z axis can be programmed to feed on a regular basis. Using two axes semi linkage machining, it is possible to achieve layered machining.
3. Linkage with three axes
The CNC machine tool has the ability to control the linkage of three coordinate axes at the same time, and it is used to process curved surfaces in general. Three axes can be used to process a general cavity mold.
4. The use of multi-coordinate linkage
A CNC machine tool is capable of controlling the linkage of multiple coordinate axes at the same time.
It is possible to machine complex shape parts such as impeller blade parts with a multi-axis CNC machine tool because of its complex structure, high precision requirements and complex programming. Generally speaking, a three-axis machine tool can perform two-axis, two-and-a-half-axis, and three-axis machining; a five-axis machine tool can only perform three-axis linkage processing, with the other two axes remaining unlinked in most cases.