There are two ways of tool change in vertical machining center: manipulator tool change and direct tool change. There are many reasons why the tool magazine can not grasp or change the tool correctly. To sum up, there are the following 7 points.
- It is caused by solenoid valve or magnetic induction switch of tool magazine
Vmc750 vertical machining center adopts direct tool change mode, and the tool magazine has two actions: swing and rotation. A three position five way solenoid valve is used to control the cylinder to drive the tool magazine to swing, and a single-phase tool magazine motor is used to realize the rotation of the tool magazine. There is a progressive switch in the magazine for counting. When changing the tool, the tool magazine should be placed at the spindle position first, put the original tool back into the tool sleeve, and then rotate the tool magazine to find the next tool. The spindle position and original position of Dongguan high-speed computer gong machining tool magazine are determined by two magnetic switches on the cylinder of the tool magazine. When the solenoid valve and magnetic switch fail and give an alarm [39-12], the tool magazine does not move to the spindle position within the specified time; when [39-15], the tool magazine does not move to the original position within the specified time. At this time, check whether the solenoid valve has action. If the swing magazine can’t hear the action sound of the solenoid valve all the time, check the valve manually (at this time, it’s better to disconnect the output end of the valve). If it’s broken, replace it.
- The three switch values in the headstock are incorrect
Whether the state of the spindle after grasping the tool is correct or not is judged by the three progressive switches (sq7 clamping switch, SQ8 release switch, sq9 no tool switch) in the spindle box. The three switches are distributed in a triangle and sense different parts of the loose broach cylinder. The correct position switch value should be (1) normal no knife: sq9 and sq7 lights on; (2) normal knife: only sq7 lights on; (3) press the knife release key: only SQ8 lights on. Usually, the three switch states are not correct. The alarm code is [39-4]: rod failure; [39-13]: rod loosening failure; [39-14]: rod clamping failure; [39-34]: tool not clamped. These kinds of alarms are related to the three progressive switches. It is necessary to check whether the switches are good or bad and adjust them to the appropriate position to make the switch indication correct.
- Damage of light board
If the valve is correct, it is necessary to check the status of I / O switch value: whether the signal of spindle position slidrum spdl000:00 / 15 or original position slidrum park000:00 / 16 has been given. Check whether the corresponding 24 V level signal on the light disaster board, the fuse on the board and the 110 V voltage signal from the light disaster board are sent to the solenoid valve, and check the signal voltage all the way to find out the fault point. Vertical CNC machine tools are usually more likely to damage the safety tube and light tube. Just buy the same glass safety tube or light tube and replace it.
- Mechanical jamming
If the handle of the knife is stuck, you can hear the pressing sound of the cylinder by pressing the release key, but the knife just can’t come off. This is due to the tool handle not pay attention to maintenance and rust, or due to the spindle taper hole or tool handle with iron chips caused by stuck. At this time, just press and hold the release key. Under the condition of confirming that the cylinder of the release broach is pressed down, use wood to act on the edge of the handle and knock the tool off gently. Another problem is that the pull rod is stuck. It is necessary to remove the spindle and knock out the pull rod. At this time, there are usually scratches on the surface of the pull rod. If it is serious, you need to mill off the scratches and knock them in again.
Sometimes the cutterhead is mechanically jammed. In addition to mechanically cleaning the iron filings stuck in the cutterhead, the operator is required to remove the iron filings in the cutterhead in time to keep the cutterhead and the handle clean.
- It is caused by incorrect counting switch of tool magazine
Incorrect counting switch of tool magazine can also lead to incorrect tool change or grabbing. There are [39-38] alarms: the tool sleeve does not turn to the correct position; [39-44] the tool magazine cannot be placed to the spindle position. Check whether the switch is damaged and adjust the switch state to the correct sensing position.
- CNC system failure
During the maintenance, some strange phenomena have been encountered, such as normal start-up of the equipment, self inspection, loading system, secondary power on, calibration of the mechanical zero point, and then calibration of the tool magazine, the tool magazine can neither rotate nor swing. After checking the I / O switch value, it is found that the switch value pridrum Park and pridrum SPDL are both 0 when pressing the fl key (Park home position) and the F2 key (SPDL spindle position), indicating that the signal is not given and the magazine will not move naturally. Check the self-test table, computer gong processing, mechanical parts processing, CNC machine tool processing, Dongguan high-speed computer gong processing found that the left main board, right main board, bridge board, servo board, I / O board, touch screen and keyboard board passed normally. However, when the electrical cabinet was opened for inspection, it was found that the bridge board indicator of CNC system was incorrect. Through the exchange and comparison test of two machine tools, the fault point is finally locked on the bridge plate and recovered after replacement.
- Machine tool protection
Sometimes, due to misoperation, the protection action of the machine tool makes it impossible to grasp the knife correctly. At this time, just press the emergency stop switch to power on again, or directly shut down the machine and restart it.
