High-speed machining center lays the foundation for improving the processing efficiency of graphite electrodes

System performance considerations

(1) Dust prevention measures

Since graphite is an abrasive material, it is extremely important to protect the machining parts of CNC machine tools from graphite dust. Some machine tool builders have developed a solution that meets the needs of these special applications. On a high-speed milling machine, there is a cylinder around the graphite workpiece and the main shaft, from which a spiral airflow (or eddy current) can be blown to keep the dust moving, so that there is no chance of sedimentation, thus achieving the purpose of vacuuming. .

Graphite processing machines should meet the following requirements:

1 Linear guides and ball screws should be protected by positive pressure airflow to prevent abrasive dust from entering the moving mechanism of the high-speed machining center.

2 All motion control electronic components and motors need to be sealed to prevent contamination of the machine control system.

3 Fully sealed enclosures with safety locks are required to be equipped with an air suction system. This processing system is suitable for processing graphite, fiberglass composites, ceramics or any abrasive material. High-speed graphite machining and milling machines are ideal for use with micro-tools. Linear guides and ball screws are equipped with a sealed protective sleeve and positive pressure airflow protection. All motion control electronics and motors are also equipped with a sealed protective sleeve and airflow cleaning system to prevent Grinding graphite dust enters.

(2) Tool length measurement

Advanced machine tools should also have another feature. The machine tool should be beneficial for the milling of graphite. The length measurement of the tool should compensate for the wear of the tool. This tool sensor/compensation replacement system consists of three separate but interrelated components:

1 tool changer. The tool changer is a tool holder or a cutter head with a spare tool space and a free tool position for the placement of the broken tool. The machine operator can store the spare tool on the tool holder, which is easy to replace when the night shift is light-free or unmanned, such as when the tool breaks.

2 tool inspection device. The tool inspection device is actually a mechanical sensor that measures the length of the tool. This is an instrument that can actually test tool wear and breakage.

3 software. The software is a macro program that can be set to run the tool check program after executing a series of code lines. For example, a macro program for a tool check can perform a check after every 500 lines of code. This type of inspection is called a "if/then" statement. In other words, it requires a process like: "Measure the tool. If the length is lower than the listed parameters, then the tool needs to be replaced."

Therefore, as the machining center progresses step by step toward the ultimate goal of efficient milling of hard steel in a single step, the technical development of the high speed machining center stays in front of the curve in terms of the efficiency and quality required to provide graphite electrode milling. This process is very helpful in mold manufacturing and will become the mainstream process in the industry for a long period of time.

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