Hello, FANUC expert: During the operation of a horizontal machining center in our company, 930AL and CRT display bar codes, and all parameters are lost after shutdown and restart. Then input the parameters in the startup state, and the machine tool can run normally. I wonder why. Please give your support and help. Thank you here!
A: The sudden loss of parameters may be related to the memory board, battery or external interference. 930 also indicates that external interference may lead to abnormal CPU operation and system alarm. Nor does it rule out the failure of the motherboard or other PCB.
2. Call 926 (18i)
Thank you for your reply to my first two questions. Now there is a 926 alarm in another machining center, and the LCD of the control system does not display the alarm information (the temperature in the electric control cabinet was high at that time). I don't know why, but I hope to answer. thank you
Answer: 926 alarm (FSSB alarm) causes and treatment: FSSB (servo serial bus) connecting CNC and servo amplifier fails. This alarm will appear if there is a problem with the FSSB, optical cable and servo amplifier connected to the axis control card. Use the LED on the servo amplifier to confirm the fault location. The 7-segment LED on the servo amplifier can be used to confirm the fault location. If the power supply of the servo amplifier fails, an FSSB alarm will appear. The power supply voltage of the amplifier fault controller drops, or the encoder cable +5V is grounded, or other reasons cause power failure, causing FSSB alarm. Replace the axis control card If the above measures diagnose that the axis control card is faulty, replace the axis control card on the main CPU board.
3. Alarm (0imate-B)
Hello: Thank you very much for the convenience your product has brought to our production. Recently, 920,965,438+065,438+0,930 alarms often appear on a lathe in our company, of which 930 is the most. Please provide technical support. I would be very grateful. Address; Shandong province Binzhou Huimin county piston company
Answer: 9 1 1 SRAM parity: (bytes 1) There is a parity error in a program storage RAM. Clear the RAM completely, or replace the SRAM module or motherboard. Then reset the parameters and data. 920 servo alarm (1-4 axis) This is the servo alarm (first to fourth axis). There is a monitoring alarm or RAM parity error in the servo module. Please replace the servo control module 930CPUINTERRUPTCPU on the motherboard, and the alarm will be interrupted abnormally. Bad motherboard or CPU card. The faulty parts can be identified by replacing the parts. In addition, attention must also be paid to the grounding and external interference of the machine tool.
4. Parameters cannot be rewritten (BJ- Fanuc -MB)
Hello, our company has a new machine, the Far East machine made in Taiwan Province Province. After the new machine was installed, we found that the B axis could not return to zero. When the B-axis turns to the zero switch, it starts to slow down, but it won't be long before the No.90 alarm appears and it can't return to zero. I don't know why, please help! Thank you very much
Answer: 90 alarm statement: when you are not satisfied? In the direction of returning to the reference point, when the position deviation (DGN.300) is greater than 128 pulse, CNC receives the condition of 1 rpm signal at least once, and this alarm appears when returning to the reference point. Check: 1. Return to zero speed. 2. A turn signal?
5. Machining Center (FANUC- 18iM)
When the machine tool is restarted after stopping for a period of time, an alarm appears: 70 1: overheating: fan motor. After investigation, it was found that the alarm was a fault of the cooling fan of the numerical control system, but after inspection, it was found that the fan was running normally and the alarm was not eliminated. Finally, only #0 of parameter 890 1 is changed from "0" to "1" to shield the alarm. I hope I can help solve it, thank you!
A: The fan is broken, but it still works. You can only buy a new substitute.
Frequently asked questions and answers
6. Machine tool alarm (FANUC- 18)
After the spindle is overloaded, the machine gives an alarm, the alarm number is 75 1, and the alarm number of the spindle servo module is AL-73. How to fix it?
Answer: The motor sensor signal is disconnected. (1) When the motor excitation is turned off, an alarm appears. (a) If the parameter setting is incorrect, please confirm the sensor setting parameters. (b) If the cable is disconnected, please replace it. (c) If the sensor adjustment fails, please adjust the sensor signal. When the signal cannot be adjusted or observed, please replace the connecting cable and sensor. (d) If the SPM fails, replace the SPM or the SPM control printed circuit board. (2) When the cable is touched (spindle running, etc.). ), alarm may be that the wire is broken. Please replace the cable. When cutting oil invades the connector, please clean it. (3) When the motor rotates, it will give an alarm. (a) Cable shielding between sensor and SPM. Fault confirmation cable shielding. (b) It is connected to the power line of the servo motor. If the cable from the sensor to SPM is bundled with the power cord of the servo motor, please bundle it separately.
7, 35 1 alarm (Oi-M)
A machining center, OI-M system, NC controls X, Y, Z and B4 axes, and B axis is the rotation axis. Fault phenomenon: 35 1 alarm appears during machining, all of which are in N5H6Z344.2 program section, but there is no B-axis work instruction in this section. After the failure, a "-"display appears on all 4-axis modules. It was normal after re-energizing, and this fault occurred again after working for a period of time. Now there are 2-3 times in each class on average. Solution: The diagnosis screen 0203#5#6 is 1, and the fault range is 1: the signal line is poorly connected; 2 encoder, motherboard, servo module hardware is bad. 1 can be eliminated because the fault can be eliminated temporarily after restarting. In view of 2, we plugged the encoder, motherboard and servo module again, but it still didn't work, or it was faulty. Please analyze what we should do next.
Answer: mainly from 1, which is related to the signal line. Check the signal cable of the alarm shaft to see when it moves (often it moves on another shaft, and the cable of this shaft is dragged). If the cable is folded for a long time and the contact is poor, an alarm will appear irregularly. At this time, only new cables can be replaced.
8, 408# and 409# alarm processing at the same time (FANUC0MD)
There are several reasons why 408 and 409 alarms appear on the machine tool. Please advise.
Answer: It is unlikely that 408 and 409 alarms will appear at the same time. 408 is poor communication, that is, there is no communication between the spindle amplifier and the system (storage board). Generally, the spindle amplifier is out of power or the interface is broken. 409 alarm, which means that the spindle amplifier has an alarm number. A specific alarm number is displayed on the amplifier.
9. Fan (0i-mate-TB)
After the alarm number "6 1 1, 9 1 13" appeared in the system, it was found that the cooling fan of the power module did not rotate, and it worked normally after replacing another fan that worked normally. Make sure the fan is broken. The above alarm still appears after the replacement of the same type of fan (the fan is operating normally). After inspection, it was found that the current of this fan was 0.03A higher than the original 0. 1A, and then it was switched with the fan on the spindle drive module, and the alarm of "611.9113" no longer appeared. Excuse me, is the detection of the fan not from the thermistor and other detection elements, but only from the current detection?
Answer: It is best to buy the same type of fan. The reason why "Fan" on CRT flashes is that there is a problem with the external fan on the radiator of the spindle drive module.
Call 10 and 97 1 to call the police! (BJFANUC0i-MateTB)
This machine tool is a CAK6 150D CNC car produced by Shenyang Machine Tool Works. In the process of automatic operation, 97 1 alarm often appears. Turn off CNC and turn it on again, and the alarm will be eliminated! Please guide the maintenance ~!
A: It may be that the power supply or connecting cable of the I/O card is loose.
1 1.FS2 1T What does the 506,507 alarm indicate (FS2 1T)?
Our company has a numerical control lathe with FS2 1T system, which will alarm 506 and 507. What are the meanings of 506 and 507 alarms in FS2 1T system and how to solve them?
Answer: 506 overtravel:+nexeedthen-thaxis+sidehardwareot.507 overtravel:-nexeedthen-thaxis-sidehardwareot. Does hardware overtravel happen at the same time?
12, position display (FANUC-0M)
The position display failed, and the position display was changed from three decimal places to four. Answer: parameter modification: No.000 1 # 0SCW 1 is enough.
Follow-up: find some. . . . Too few. . . Answer:
1, adopt appropriate and reasonable tool setting method.
After the tool is installed, before the machining program is executed, the tool should be aligned to determine the starting position. However, tool alignment is often a headache for operators (economical numerical control without self-checking device), which is labor-consuming and time-consuming, especially when machining with multiple tools, it is necessary to measure the tools to make up the value. Usually, the commonly used tool setting methods are:
Point to point tool setting method
Press and hold the inching key on the control panel, lightly touch the tip of the tool on the surface of the workpiece (inching twice in X and Z directions), and the counter will be cleared, then return to the set initial position (initial design value of X and Z), and then clear it to get the initial position of the tool. Determine the initial position of each knife in turn, and adjust it to the accurate design position (starting point) after trial processing. This method can be easily operated without any auxiliary tools, but it takes a long time, especially if the tools have to be readjusted every grinding.
This method is suitable for simple process or initial installation and debugging.
The self-checking device is used for the tool setting device selected by the machine tool, but the operation is complicated and it still needs a certain preparation time. Suitable for multi-tool measurement.
Adopt numerical control tools
After the initial positioning of the tool installation, after a period of cutting, it is worn and needs sharpening. When the universal tool is reinstalled, the position of the tool tip has changed and needs to be realigned. The characteristics of CNC tools are high manufacturing accuracy, and the precision of repeated positioning of blades after indexing is about 0.02mm, which greatly reduces the time of tool alignment. At the same time, wear-resistant layers (SiC, TiC, etc. ) is coated on the surface of the blade, which greatly improves its durability (3 ~ 5 times), but the cost is higher.
Adopt self-made knife alignment method.
The simple tool alignment block made of plastic and plexiglass can easily realize the repeated positioning of the tool after grinding, but the positioning accuracy is poor, usually 0.2 ~ 0.5 mm, but it is still a quick positioning method, and it is very convenient to adjust again.
2. The method of eliminating the shape error that is easy to appear when machining spherical surface.
When machining spherical surfaces, especially those with quadrants, it is easy to produce shoulders and shovel backs due to improper adjustment. The main reasons are:
Caused by system gap
In the transmission pair of the equipment, there is a certain gap between the lead screw and the nut. With the increase of equipment running time, the gap gradually increases due to wear and tear. Therefore, the corresponding clearance compensation in reverse motion is the main factor to overcome the shoulder on the machining surface. Clearance is usually measured with a dial indicator, and the error is controlled within 0.01~ 0.02 mm. It should be pointed out here that the meter base and the meter rod should not protrude too high and too long, because the meter base is easy to move when measuring, which leads to inaccurate counting and untrue compensation value.
Uneven machining allowance of workpiece
Before the design surface of the part is realized, whether the machining allowance of the surface to be machined is uniform is also an important reason for whether the molding surface can meet the design requirements, because uneven machining allowance is easy to cause "double reflection" error. Therefore, for parts with high surface shape requirements, the machining allowance should be as uniform as possible or more than one surface should be machined to meet the design requirements before molding.
Causes of improper tool selection
The tool removes material through the main cutting edge when cutting. However, after the arc passes through the quadrant and the arc is tangent to the cutting edge of the tool pair (the intersection line between the back of the tool pair and the base surface), the auxiliary cutting edge may participate in cutting (that is, shovel back) afterwards. Therefore, when selecting or grinding tools, the wedge angle of the tools must be considered.
3. Reasonable design of processing technology
Using numerical control processing equipment for processing has high efficiency and good quality, but if the process design is not properly arranged, its advantages cannot be well reflected. Judging from the processing and use of some manufacturers, there are some problems as follows:
The process is too scattered.
The reason for this problem lies in the fear of complexity (referring to preparation time), simple programming, simplified operation and processing, easy adjustment and tool alignment when using tools, and accustomed to ordinary processing.
As a result, the product quality (position tolerance) is not easy to guarantee, and the production efficiency cannot be fully exerted. Therefore, technicians and operators should be fully familiar with the knowledge of NC machining, try to master relevant knowledge and adopt centralized machining method as far as possible, which will naturally show its advantages. After adopting the centralized process, the unit processing time increased, and we arranged two equipments face to face, which realized that one person could operate two equipments, greatly improving the efficiency and ensuring the quality.
The processing sequence is unreasonable.
Some operators often arrange the processing sequence unreasonably considering some problems in preparation. Numerical control machining is usually carried out according to the requirements of general processing technology, such as rough before fine (tool change), internal before external, reasonable selection of cutting parameters, etc. In order to improve quality and efficiency.
Use G00(G26, G27, G29) fast positioning command with caution.
G00 instruction brings great convenience to programming and use. However, if it is not properly set and used, it will often lead to some adverse consequences, such as overshoot when returning to zero, decline in accuracy, and strain on the guide surface of equipment. If you don't pay attention to the zero-return route, it is easy to cause safety accidents that collide with workpieces and equipment. Therefore, we are considering using G00.
When giving instructions, you should be considerate and not arbitrary.
In NC machining, special attention should be paid to the retrieval and trial operation of the program. After the program is input into the control system, the operator should use SCH.
Keys and ←, ← → Move keys to search for uncertainty and certainty, and modify the program if necessary to ensure the accuracy of the program. At the same time, before the formal implementation of the program processing, it is necessary to run the program (turn on the power amplifier) to confirm whether the processing route is consistent with the design route.
The above are some common problems and solutions when using CNC machining equipment. Other problems may be encountered in practical work, but as long as engineers and technicians and operators brainstorm and master the knowledge and skills about numerical control seriously, numerical control equipment can exert the greatest benefits for enterprises. 1. Q: How to divide the processing procedures? Answer: Generally, the division of NC machining processes can be carried out according to the following methods: (1) tool centralized sorting method.
It is to divide the process according to the tool used, and process all the parts that can be completed with the same tool. Use the second knife and the third knife to complete other parts they can complete. This can reduce the number of tool changes, idle time and unnecessary positioning errors. (2) Processing parts sequencing.
For parts with more processing contents, the processed parts can be divided into several parts according to their structural characteristics, such as internal shape, external shape, curved surface or plane. Generally, the plane and positioning surface are processed first, and then the hole is processed; Machining simple geometric shapes first, and then machining complex geometric shapes; Machining parts with lower precision first, and then machining parts with higher precision requirements. (3) Through rough and finish machining.
For parts prone to machining deformation, shape correction is needed due to possible deformation after rough machining, so generally speaking, the process should be divided into rough machining and fine machining. To sum up, when dividing the process, we must flexibly grasp the structure and manufacturability of parts, the function of machine tools, the content of NC machining of parts, the number of installations and the production organization of units. In addition, it is suggested to adopt the principle of centralized process or decentralized process, which should be determined according to the actual situation, but it must be reasonable. 2. Q: What principles should be followed in the arrangement of processing sequence? Answer: The arrangement of machining sequence should be considered according to the structure of parts, blank conditions and the needs of positioning and clamping. The key is that the rigidity of the workpiece will not be destroyed. Generally speaking, the sequence should be carried out according to the following principles: (1) The machining of the previous procedure cannot affect the positioning and clamping of the next procedure, and the machining procedures of general machine tools should also be considered comprehensively. (2) Add the inner cavity first, and then process the shape. (3) It is best to connect the same positioning and clamping method or the same processing technology with a knife, so as to reduce the times of repeated positioning, tool change and moving the platen. (4) For multiple processes in the same installation, the process with little damage to the rigidity of the workpiece should be arranged first. 3. Q: What should be paid attention to when determining the clamping mode of the workpiece? Answer: When determining the positioning datum and clamping scheme, we should pay attention to the following three points: (1) Try to unify the datum of design, technology and programming calculation. (2) Minimize the number of clamping, and as far as possible, all the surfaces to be processed can be processed at one time. (3) Avoid manual adjustment scheme. (4) The fixture should be opened smoothly, and its positioning and clamping mechanism should not affect the tool (such as collision) during machining. In this case, you can use a vice or add a bottom plate to pull the screw to clamp the fixture. 4. Q: How to determine the reasonable tool alignment point? What is the relationship between workpiece coordinate system and programming coordinate system? 1, the tool setting point can be located on the machined part, but pay attention to the tool setting point must be the reference position or the machined part. Sometimes the tool alignment point is destroyed after the first process, which will lead to the tool alignment point in the second process and later. Therefore, in the first process of tool alignment, it is necessary to set the relative tool alignment position where there is a relatively fixed size relationship with the positioning datum, so that the original tool alignment point can be retrieved according to the relative position relationship between them. This relative tool alignment position is usually set on the machine tool table or fixture. The selection principles are as follows:
1) alignment is easy. 2) Convenient programming. 3) The tool alignment error is small. 4) The inspection during processing is convenient and reliable. 2. The origin position of the workpiece coordinate system is set by the operator himself. After the workpiece is clamped, it is determined by tool alignment, which reflects the distance and position relationship between the workpiece and the zero point of the machine tool. Once the workpiece coordinate system is fixed, it will generally not change. The workpiece coordinate system and the programming coordinate system must be unified, that is, the workpiece coordinate system and the programming coordinate system are consistent during machining.
Verb (abbreviation of verb) Q: How to choose the cutting route? Tool path refers to the path and direction of the tool relative to the workpiece during NC machining. The reasonable selection of machining route is very important, because it is closely related to the machining accuracy and surface quality of parts. When determining the feeding route, the following points are mainly considered:
1) Ensure the machining accuracy requirements of parts. 2) It is convenient for numerical calculation and reduces programming workload. 3) Seek the shortest machining route, reduce the empty cutter time and improve the machining efficiency. 4) Minimize the number of program segments. 5) Ensure the roughness of the contour surface of the processed workpiece, and the final contour shall be processed continuously by the last line. 6) The advance and retreat (cutting in and cutting out) route of the tool should also be carefully considered, so as to minimize the tool marks left by stopping at the contour (elastic deformation caused by sudden change of cutting force) and avoid cutting the workpiece vertically on the contour surface.
Q: How to monitor and adjust during processing? After the workpiece is centered and the program debugging is completed, the automatic processing stage can be entered. In the process of automatic machining, the operator should monitor the cutting process to prevent the quality problems and other accidents caused by abnormal cutting.
Monitoring the cutting process mainly considers the following aspects: 1, monitoring the machining process.
Rough machining mainly considers the rapid removal of excess allowance on the workpiece surface. In the automatic machining process of machine tool, according to the set cutting parameters, the tool automatically cuts according to the predetermined cutting trajectory. At this point, the operator should pay attention to observe the change of cutting load in the process of automatic machining through the cutting load table, and adjust the cutting amount according to the tolerance of the tool to give full play to the maximum efficiency of the machine tool.
2. Monitoring of cutting sound during cutting.
In the process of automatic cutting, generally, when cutting begins, the sound of the tool cutting the workpiece is stable, continuous and brisk, and the machine tool moves smoothly at this time. With the progress of cutting process, the cutting process will be unstable when there are hard spots, tool wear or tool sticking on the workpiece. Instability is manifested in the change of cutting sound, the collision sound between tool and workpiece, and the vibration of machine tool. At this point, the cutting amount and cutting conditions should be adjusted in time. When the adjustment effect is not obvious, stop the machine tool and check the condition of the tool and workpiece.
3, finishing process monitoring
Finishing is mainly to ensure the machining size and surface quality of the workpiece, high cutting speed and large feed. At this time, we should pay attention to the influence of chip accumulation tumor on the machined surface. For cavity machining, we should also pay attention to cutting to make way for the tool at the corner. To solve the above problems, we should first pay attention to adjusting the injection position of cutting fluid so that the machined surface is always in the best cooling state; Second, we should pay attention to the quality of the machined surface of the workpiece, and avoid quality changes as much as possible by adjusting the cutting parameters. If the adjustment still has no obvious effect, stop the machine and check whether the original scheme is reasonable.
When stopping inspection or stopping inspection, it is particularly important to pay attention to the position of tools. If the tool stops in the cutting process and the spindle stops suddenly, it will cause tool marks on the surface of the workpiece. Usually, when the tool leaves the cutting state, the machine is stopped.
4. Tool monitoring
The quality of the tool largely determines the processing quality of the workpiece. In the process of automatic machining and cutting, it is necessary to judge the normal wear and abnormal damage of tools by means of sound monitoring, cutting time control, pause inspection during cutting and workpiece surface analysis. According to the processing requirements, timely handle the tools to prevent the processing quality problems caused by the untimely processing of the tools.
Q: How to choose machining tools reasonably? How many factors are there in cutting parameters? How many kinds of knives are there? How to determine the rotational speed, cutting speed and cutting width of the tool?
1, face milling should choose carbide end milling cutter or end milling cutter. Generally, the secondary feed is used as much as possible in milling, and the primary feed is preferably roughed by end milling cutter and continuously fed along the surface of the workpiece. The width of each feed is suggested to be 60%-75% of the cutter diameter.
2. End mills and end mills with cemented carbide blades are mainly used to process bosses, grooves and box mouth surfaces. 3. Spherical knives and circular knives (also known as circular nose knives) are usually used to process curved surfaces and variable bevel profile shapes. Ball-end milling cutter is mostly used for semi-finishing and finishing. Round cutters of cemented carbide tools are mostly used for rough machining.
8. Q: What is the function of the processing procedure sheet? What should be included in the list of processing procedures? (1) machining program sheet is one of the contents of NC machining process design, and it is also the regulation that operators need to abide by and implement. It is a concrete description of the processing procedure. The purpose is to let the operator know the content of the program, the way of clamping and positioning, and the problems that should be paid attention to when selecting tools for each machining program.
(2) The list of machining programs shall include: file name of drawings and programs, workpiece name, clamping sketch, program name, tools used in each program, maximum cutting depth, machining nature (such as rough machining or finish machining), theoretical machining time, etc.
Q: What preparations should be made before NC programming? Answer: After determining the processing technology, before programming, you should know: 1, the workpiece clamping method.
; 2, the size of the workpiece blank-to determine the processing range or whether it needs multiple clamping; 3, the material of the workpiece-what kind of tool to choose for processing; 4. What are the tools in stock? -Avoid modifying the program, because there is no such tool in the process. If you must use this tool, you can prepare it in advance.
Q: What are the principles for setting a safe height in programming? A: The setting principle of safety height: generally higher than the highest surface of the island. Or set the programming zero point at the highest surface, which can also avoid the danger of tool collision to the maximum extent. 1 1. Q: Why do you need post-processing after the tool path is compiled? Answer: Because different machine tools can identify different address codes and NC program formats, it is necessary to choose the correct post-processing format for the machine tools used to ensure that the compiled program can run.
12. Q: What is DNC communication? (A) the way of program delivery can be divided into CNC and DNC. CNC means that the program is transmitted to the memory of the machine tool through media (such as floppy disk, tape reader, communication line, etc.). ) and transfer the program from the memory for processing. Because the memory capacity is limited by the size, DNC can be used for processing when the program is large. Because the machine tool reads the program directly from the control computer during DNC processing (that is, doing it while sending), it is not limited by the memory size.
(2) Cutting parameters have three elements: cutting depth, spindle speed and feed speed. The general principle of selecting cutting parameters is: less cutting and faster feed (that is, less cutting depth and faster feed).
(3) Cutting tools are classified according to materials, generally divided into ordinary hard white steel cutting tools (high speed steel materials), coated cutting tools (such as titanium plating) and alloy cutting tools (such as tungsten steel and boron nitride cutting tools).