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The reason why the accuracy of the walking machine does not meet the standard

 There will be more or less jitter during the processing of the core machine. In order to ensure better accuracy, we need to take some measures to avoid the jitter of the equipment. 

Today, I will give you a brief introduction.

  • 1. Use sharp blades to reduce the cutting force of the core machine: The machine clamp blades are divided into coated blades and non-coated blades. Uncoated blades are usually sharper than coated blades, because if you want to coat the blades, you must Its passivation (ER treatment), due to the sharp edges, will affect the bond strength of the coating at the edges.
  • 2. When selecting the cutting depth, avoid the cutting depth equal to the radius of the tool tip arc.
  • 3. When the cutting depth is constant, the use of a smaller tip arc radius will undoubtedly reduce the cutting force, especially the radial cutting force, and the radial cutting force is to produce a slender rod-shaped tool or workpiece. The main cause of vibration. Whether it's collision or milling. Under the same cutting depth, the radius of the nose radius is larger. The slender tool shaft has a greater tendency to vibrate.
  • 4. For slender tools, circular insertion tools can well dampen vibration. The milling cutter is opposite to the stirring cutter. The closer the lead angle is to 90°, the greater the radial cutting force and the greater the vibration of the handle. Therefore, in the end face milling of the deep cavity of the mold, the CNC milling machine usually chooses a leading angle milling cutter with a 45° cutting angle of less than 1mm. Usually use round blade milling cutter or ball cutter.
  • 5. The CNC core machine uses a slender end mill to mill deep cavities, often using plug-in milling. Plunge milling means that the tool enters the tool axially like a drill. 7 hours for milling deep cavities. When drilling the inner hole, the blade angle of the blade should be as small as possible. The secondary lead angle is large and the secondary edge is processed. The vibration contact area of ​​the surface is small, and the vibration is difficult to transform into vibration. The chance of the secondary cutting edge being squeezed is also very small.

If it is found that the accuracy of the walking machine has not reached the standard during use, the user needs to reflect on it. There are three reasons, including:

  • 1. Micro-lubrication is not used well: When the walking machine is working, a series of operations such as milling and cutting of the profile are often required, because the tool and the profile will be reciprocated again and again. During this period, severe friction between the tool and the profile will inevitably occur, and the damage to the tool due to frictional heating has to be taken as necessary. At present, in order to effectively reduce the wear caused by tool heating, many companies will introduce necessary cooling during the processing process.
  • 2. Quality factor: Compared with the lubrication factor, the quality of equipment is often more serious, because once the scoring machine is determined to be because the quality of the equipment is not good enough, the processing accuracy is not up to standard, then the problem will become extremely troublesome to deal with.
  • 3. Operational factors: No matter how highly automated equipment is, it cannot do without the assistance of people. When operating the core machine for profile processing, the parameter settings and personal actual operating experience will affect the processing accuracy of the equipment. If the quality of the equipment is reliable and the processing accuracy is still not up to standard, then the "operator" is often to blame.

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