High-speed milling of graphite electrode prism surface

The main problem with prism surface treatment of graphite electrodes is damage to the local corners of the mold. It is mainly necessary to consider the direction of action of cutting resistance.

1.processing the bottom of the floor

With clockwise milling, the surface roughness remains almost unchanged and the quality of the bottom edge is good. However, counterclockwise milling increases the surface roughness value and reduces the quality of the bottom corner edges (Figure 13a). To get high quality corners, you first need to mill the edges.

2.processing vertical plates

If both sides are clockwise, the direction of force is different. That is, one side is pushed in and the other side is pushed out (Figure 13b). Therefore, when cutting a corner, you need to change the actual feed direction.

3.treat the top surface of the upright corner plate

When milling counterclockwise, it is necessary to avoid the cutting position by repositioning the entry point to avoid fragmentation of the workpiece corners. Tool angles, such as lead angles, have a significant impact on this type of chipping and are generally controlled at around 30 °.

To prevent the formation of corners during milling. You can also take the following steps:

  • 1. Immerse in the treatment liquid before electrode treatment.
  • 2, use of excellent wear resistant tools.
  • 3, using the method for processing the crushing clockwise (knife down),
  • 4. Reduce the amount of cutter cut during cutting.
  • 5. Cutting tool pitch The cutting amount is less than 1/2 of the tool diameter.
  • 6. Decelerates the processing when processing both ends.
  • 7. Use pads to increase the rigidity of the terminal surface when machining the bottom surface.

When machining the corner between the upper curved portion and the side surface, if fine cracks are likely to occur, the side surface must be finished after the machining of the upper curved portion is completed.

Graphite is a very stable material, but it has no direct adverse effect on human health and can be easily washed with soap. However, graphite chips can affect the environment in the form of dust, pollutants, etc., which are also harmful to the human body. Therefore, it is best to use a vacuum cleaner and mask when machining.

Chip morphology affects tool wear due to dust, broken chips, and the cutting medium used. Graphite particles during wet cutting are caused by the flow of the tool, but dry cutting tools with external blowing have a longer life than normal dry machining. Strong spraying prevents secondary wear of graphite particles. Treatment of electrolyte-impregnated graphite significantly reduces tool wear.

In addition, the cleaning of graphite powder must be highly valued. Equipment must be provided to draw the purified graphite powder into the wet unit and the roughing cycle must be performed with a clean cycle and intermittent filtration.

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Author: ANDY Minghe