Tag Archive Operation process of milling head in CNC machining

Operation process of milling head in CNC machining

CNC milling head can increase the application range, if there is no milling head, boring machine can only process one station, and after installing the milling head, it can install more than 8 stations, and the extension range of spindle can also be expanded.

  1. The use of milling head should also be based on the parameter characteristics of each model, in the appropriate processing conditions, that is to select milling head products for processing.
  2. Avoid long time let milling head at the highest speed of continuous processing, this kind of shaft running mode is easy to cause overwork, will damage the service life of the machine.
  3. It should be confirmed several minutes before commissioning. Each time processing, need to select the appropriate speed and feed processing. Pay attention to adjust the speed, feed and cutting depth gradually until the maximum machining efficiency is achieved.
  4. In most cases, the milling head uses non-contact oil seal. If you want to use cooling water in the machining process, you should avoid adding it directly. Instead, you should run for a while before spraying water, and adjust the direction of the cooling water nozzle to spray water towards the tool, so as to prevent the cooling water from penetrating into the body and causing damage to the machine.

In the process of CNC machining center working, intermittent current alarm appears, English prompt appears on the display interface, 12 words appear in the spindle display module, and 0 display appears at the power module, which can be directly understood as zero voltage. From this point, it can be preliminarily inferred that there is current and leakage at the fault part of CNC machining center.

When checking other parts that may cause current alarm, there is no special phenomenon. The material of processing parts is in line with the operating conditions of CNC machining center, and there is no error in speed and processing mode, so there is no current overload phenomenon.

Check the circuit and find no abnormality,

CNC machining center is the use of three-phase power supply, the voltage is normal, so it is not circuit failure.

When observing the current alarm of CNC machining center again, it is found that the main position of the equipment is in the same feeding area every time the alarm is given. Further observation shows that the wire at the end of the threading slot is damaged, so when the spindle of CNC machining center moves to this area, the wire will cause short circuit fault.

After finding the cause of the fault, it is necessary to cut off all the power supply of CNC machining center, replace the damaged wire, and pass the new wire through the bend at the end of the slot.

The common sheet parts such as washer, friction plate, sample plate and thin plate, due to poor rigidity, heat dissipation difficulty, bending after heat treatment, clamping deformation during clamping and warping during grinding, usually use magnetic chuck to grind on the surface grinder. After grinding, the magnetic attraction is removed, and the sheet work is restored to its original state, so it is difficult to ensure the processing accuracy. If the following clamping methods are adopted to ensure the positioning and clamping of the sheet workpiece in the free state, and the double end face is used for grinding, good results can be achieved and the machining accuracy requirements of the parts can be met.

1 elastic gasket clamping mode, {i5 E3 U8 d * [9 F

When grinding the sheet workpiece on the surface grinder, the elastic clamping mechanism is adopted to realize the positioning and clamping of the sheet workpiece in the free state. A layer of rubber with thickness of 0.5mm is padded between the workpiece and the magnetic worktable. When the workpiece is affected by the magnetic attraction, the rubber is compressed and the elastic deformation becomes smaller, so that the flat plane of the workpiece can be ground. Repeated grinding for several times can meet the requirements of machining accuracy.

  1. Using temporary measures to strengthen the rigidity of sheet workpiece: Z8 V2 I6 s * U2 E. I – [7 V

Epoxy resin is used to bond the sheet to a flat plate in free state. Place the plate and the sheet on the magnetic chuck. After grinding the plane of one end of the sheet, remove the sheet from the flat plate, put the flat side on the magnetic chuck, and then grind the plane of the other end of the sheet. Due to the fluidity of epoxy resin before hardening, it can fill the gap between the sheet workpiece and the flat plate. When the epoxy resin is hardened, the workpiece and the plate are bonded together to form a whole, thus greatly enhancing the rigidity of the workpiece. Under the magnetic force attraction, the sheet workpiece will not produce clamping deformation in CNC machining, which creates the conditions for grinding out the flat plane. Thick grease can also be used instead of epoxy resin to fill the gap between the sheet workpiece and the magnetic chuck, so as to enhance the rigidity of the workpiece, and good results can also be obtained.

  1. Mechanical clamping mode ‘H9’) g% B x / J

Therefore, the small flat tongs of the worktable with magnetic force can absorb the workpieces. The feed rate is gradually reduced to grind one plane of the sheet workpiece and then take it off. At this time, the ground plane is put on the magnetic worktable, and then the other plane of the sheet workpiece is grinded again and again, and the flatness of the two planes meets the requirements. (Y4 @ 7 F. Z0 F “S9 X4 vacuum clamping mode ‘d0 L1 Q0 | 3 {8 h” g (V / K: l)

The pressure of atmosphere is used to clamp the workpiece for grinding.

Its working principle is: the clamp is provided with a rubber sealing ring, and the sheet workpiece is placed on the rubber sealing ring, so as to form a sealing cavity between the workpiece and the clamp. The vacuum pump is used to draw the indoor air from the air extraction hole, and the workpiece is clamped. Because of the small clamping force, the circular grinding method can be used for grinding. When one end of the workpiece is ground and the other end of the workpiece is ground, the above method can be used and satisfactory results can also be obtained.