Seek to know what performance the pulse equivalent represents for the CNC machine

Pulse equivalent refers to the minimum number of millimeters that the table of a machine tool can move under the control of the servo system and numerical control device.

The axial direction of the CNC lathe is generally radial.

The machining center is generally about .

The size of the pulse equivalent generally affects the accuracy of the machine tool The accuracy of the processed parts The pulse equivalent affects the machining accuracy of the CNC machine tool, and the smaller its value is, the higher the machining accuracy.

g is the electronic gear ratio: g = command pulse frequency division numerator command pulse frequency division denominator.

a = one pulse stroke b = servo motor stroke per revolution c = encoder feedback pulses per revolution.

ba=---gc

It can generally represent its resolution, but not accuracy.

Specifically, if:

Pulse equivalent=, then when CNC gives a pulse signal, the driver drives the motor to act;

After giving 100 pulse signals, the driver drives the motor to move 2mm;

Of course, the pulse signal is not necessarily given by CNC, there is also a manual part, such as a hand-cranked wheel, or a hand-held pulse generator.

The pulse equivalent represents the precision performance of the machine tool. 10 years ago, China's economic CNC equipment pulse equivalent is mostly for that, said.

The table of the machine tool can move down to a minimum of millimeters under the control of the servo system and the numerical control device, which is now generally the case, and the accuracy is increased by a factor of 10.

Methods for calculating pulse equivalents, etc.

1. First of all, the lead screw of lead 5 is that the spacing of every two wires is 5;

2. The stepper motor is 200 steps, and it is 200 degrees to walk around 3. The driver is 8 subdivisions, which is to divide it into 8 times.

4. So every step of the motor through the drive is degree 8 = degree 5, so each revolution is 200 8 = 1600 step 6, the lead screw of lead 5 goes 5 mm per revolution, and each step is 5 1600 = mm, which is the motor parameter.

If it is a parameter of lead 3, it is, and so on.

7. Divide 1 by the motor parameter is the pulse equivalent, for example: 1, is how many steps are needed for each 1 mm, which is the pulse equivalent.

The main performance indicators of CNC machine tools.

1) Main specifications and sizes. CNC lathes mainly have the maximum rotation diameter, maximum turning length, maximum turning diameter and other specifications and dimensions of the bed and tool holder; CNC milling machines mainly have specifications and sizes such as workbenches, workbench T-slots, and worktable strokes.

2) Spindle system. The spindle of CNC machine tool is driven by DC or AC motor, which has a wide range of speed regulation and high rotation accuracy, and the spindle itself has good stiffness and vibration resistance. Now, the spindle of CNC machine tools generally reaches 5000-10000T ILTLN, or even higher speed, which is extremely beneficial to improve the processing quality and the processing of various small holes; The spindle can directly change the speed by the speed multiplier switch on the operation panel, and each gear interval is 5, and its adjustment range is 50 120; When machining the end face, the spindle has a constant cutting speed (constant linear speed unit:

mm／…3) Feed system. The system has the main technical parameters such as feed speed range, fast traverse (idle stroke) speed range, motion resolution (minimum movement increment), positioning accuracy and pitch range.

4) Tooling system. Including the number of tool holder stations, tool hole diameter, tool holder size, tool change time, repeated positioning accuracy, etc. The tool magazine capacity of the machining center and the tool change time directly affect its productivity, usually the tool magazine capacity of small and medium-sized machining centers is 16 60, and the large machining center can reach more than 100.

Tool change time refers to the time required by the automatic tool change system to exchange the tool on the spindle with the tool in the tool magazine, and the tool change can generally be completed in 5-20s.

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The definition of pulse equivalent sung sedan is the displacement of the positioning control movement that occurs when the controller outputs a positioning control pulse. In the case of linear motion, it refers to the distance traveled, and in the case of circular motion, it refers to the angle at which it turns.