Mitsubishi CNC machining problems and experience - Solutions - Huaqiang Electronic Network

Single chip microcomputer STM32L151CCU6

SMD aluminum electrolytic capacitor

Mobile phone crystal 3.2*2.5mm 3225 26M (26.000MHZ) 7.5PF 10PPM 20PPM 30PPM

Speed ​​and accuracy

The M70B system has the following processing modes.

One is the G64 mode, which is characterized by coarse positioning, and the F speed is strictly in accordance with the specified F value, and will not decelerate. The path will be different from the program. (Parameter 1125 is set to 1, you can see the actual F speed)

One is the G61 mode, which is characterized by precise positioning. The F speed will be different from the program. When the corner is encountered, the arc will decelerate. But the path is exactly as specified by the program.

There is also a G61.1 modality, which is characterized by coarse positioning (parameter 8019 is set to a small value, such as 10; parameter 8021 is set to 0), and can also be accurately positioned (parameter 8019 is set to a larger value, such as 90; parameter 8021 is set to 0) Note that when the precise positioning is encountered, the arc will automatically decelerate, and the deceleration is determined by the size of 8019.

In addition to the above modes, the M70A system also has the G05 P10000 mode, which is basically similar to the G61.1 concept, but is more suitable for the three-dimensional modeling of tiny segments.

How to use several modalities:

G64 mode---G64 is specified in the machining program, or parameter 1148 is set to 0, and the power is restarted.

G61 mode --- specified G61 in the machining program

G61.1 modal - specify G61.1 in the machining program, or set parameter 1148 to 1, power off and restart #p#page title#e#

G05 P10000 Mode - Specify G05 P10000 at the start of cutting, and then specify G05 P0 at the end of cutting. Note that there can only be G01 G02 G03 mode between G05 P10000 and G05 P0. Please refer to the manual for details.

Summary---When the Mitsubishi system goes through the program, the speed and accuracy can't be both, and we must give up one. If the customer demands fast speed and high precision, then only G61.1 or G05 P10000 can be used.

Modal, then make up the data of 8019.

A little experience - parameter 1125 is set to 1, then go through the program to see if the displayed F value is the F data specified during programming. If it is, then the actual path may be deviated from the programming.

If not, then the actual path should be basically in line with the design of the program.

1, cut into rounded corners at right angles, the milling circle size is small

Reason---Typical phenomenon caused by rough positioning

Countermeasure---G61.1 mode, 8019 set 80, 8021 set to 0

2. When the curve (small line segment) is taken, the machine tool vibrates and the straight line does not vibrate.

The reason - 8020 is set too small, causing frequent acceleration and deceleration when taking small line segments.

Countermeasure---8020 set a big point, such as 30

#p#分页头#e#

3, the surface surface smoothness is poor

Reason - the servo is not optimized

Not using G05 P10000 function, or the related parameter setting is unreasonable

Countermeasures---Use MS Configurator software for servo optimization, and make reasonable settings for parameters such as speed loop gain, position loop gain, feedforward, and SHG gain.

Use the G05 P10000 function and optimize a series of parameters such as 1206, 1207, 1568, 1569, and 8019.

4, 4 quadrant points have concave or convex appearance

Reason - 4 quadrant points are not compensated for lost motion, or the compensation data is incorrect.

Backlash compensation is incorrect.

Countermeasure---Use MS Configurator software to do automatic lost motion compensation. If it still doesn't work, you can fine-tune the data of 2216 (sometimes try to set 2216 to -1)

Measure the correct backlash and set it into 2011 and 2012. Note that 2011 is the backlash of G0, and 2012 is the backlash of G1. The unit is 0.5 缪.

5, the lower knife point has a knife pattern #p#page title#e#

Causes and countermeasures are the same as above

6, servo motor vibration

Reason --- Resonant frequency setting is unreasonable

Countermeasures --- fine-tuning the data of 2238, 2233, 2233 can generally set 0090, 00A0, 00B0

7, the corner automatically decelerates, resulting in a overall slow processing speed

Reason - the typical phenomenon of precise positioning

Countermeasures---Use coarse positioning, please refer to the above for specific methods.

8, the corner does not automatically slow down, resulting in poor processing results

Reason---the typical phenomenon of rough positioning

Countermeasures---using precise positioning, the method is as follows

9. When processing 3D, the movement is not smooth, and there is a feeling of a meal.

Reason ---8020 is set too small

Counter---Set 8020 to a larger size, such as 50#p#page title#e#

10, the overall processing effect is not good

The reason --- may be related to tool quality, spindle speed, mechanical rigidity, electrical reasons are not necessarily the only factor

Countermeasures---Use MS Configurator software to do servo optimization, true park lost motion compensation, and the parameters are basically set properly, and the various modes such as coarse positioning and precise positioning are all

After the trial, if the problem still has not improved, the reason for the electrical can be ruled out.

A machine that has been adjusted better should have the following parameters:

Speed ​​loop -2205 - generally set around 200

Position loop -2203--33

2204--88

2208--1900

2215--100

2257--198

Feedforward gain--2010--general 40

High precision parameter --8019~8023

1206, 1207

1568, 1569, 1570

Set according to the actual situation

Lost step compensation - see above

#p#分页标题#e#Backlash--2011

2012

Mechanical correction - reference manual

11. When the three-axis interpolation cuts the inclined plane, the surface is rough.

Cause—The acceleration and deceleration time of the three axes is different, resulting in a time difference problem.

1206, 1207 settings are unreasonable, resulting in three-axis interpolation is not synchronized

Countermeasure---Set the acceleration and deceleration time of the three axes to be consistent

1206 sets 8000, 1207 sets 300, so that the three-axis interpolation can be synchronized, not one faster and one slower.

Adjust the data of 1568, 1569, 1570, refer to the specification.

12, rigid power wire problem

Mitsubishi's standard rigid workwire format is

G84 Z-10. R0 F1.0 S300, R1

Where F1.0 is the pitch

, R1 is a rigid work wire

If you want to use the M29 format, you can also modify the plc.

In the middle of the rigid work wire, if you press the reset button, you can not move any axis, and 0057 alarm occurs. This is a normal phenomenon, the purpose is to prevent the spindle from being broken. The countermeasure is to take the parameter.

1234 is all set to 1

#p#Page title#e#13, start in the middle of the program

In two cases, one is to execute from anywhere in any program.

The method is -- first, make a paragraph number where you want to start execution, such as N100

Then, in the main screen, press the "Search" option to call this program out.

Then, press the "Search" option, enter /100, press INPUT to confirm, you can

If "Search failed" is displayed, it must be that there is no segment number of N100 in this program.

Note that modals such as G54, G90, and G43 need to be manually specified in MDI mode.

In the second case, the program is half processed. Because the reset button is pressed, or the power is turned off, etc., the machining is aborted. It is necessary to restart the execution from the place where it was stopped.

The method is -- first, switch to the main screen

Then press the "Search Again" button

Then, press the INPUT button again, you can

14, simple points, simple tool

Mitsubishi has the function of simple centering and simple tool setting, which can greatly improve the efficiency of the above two operations.

The premise is that the YC20 should be switched on in the PLC.

Then in the “TOOL” screen, select “W” and follow the on-screen instructions.

15, the problem of running coordinates

Mostly because the customer has connected the manual ABS function (YC28)

Another possibility is that the customer added a bias in EXT and G92.

Countermeasures---Cancel the manual ABS function

Execute G54 X0 Y0 Z0 and see where the mechanical coordinates last stopped. #p#分页头#e#

16,232 can not communicate problems

If 232 communication (including online processing) is to be successful, the following conditions must be met. If there is a problem in any place, communication may not be possible.

First of all: the COM port on the computer side, the COM port on the CNC side should be normal, can be used (the CNC side can select port 1 or 2 through the 9001 series parameters)

Second: There must be communication software on the computer side. It is recommended to use Cimco. Note that if the software is not properly selected, it may cause abnormal communication and other abnormal phenomena.

Third: the parameters in Cimco should be set correctly. Generally, just set the COM port and baud rate.

Fourth: The CNC side parameters should be set correctly, including: 6451---0th, 4th, 1,8109, 0. The 9001 series parameters are set according to Mitsubishi.

Fifth: The communication cable should be soldered in accordance with Mitsubishi's regulations.

All of the above five points must be confirmed without problems, and communication can be normal. Conversely, if the communication is not normal, then there must be at least 1 of the above 5 points.