When choosing a tool that is more suitable for you, you should consider the following aspects:
1. The tool performance of the material to be processed
The tool material is the fundamental factor that determines the tool performance of the tool, which has a great influence on the processing efficiency, processing quality, processing cost and tool durability. The harder the tool material, the better its wear resistance, the higher the hardness, the lower the impact toughness, and the more brittle the material is. Hardness and toughness are a pair of contradictions, and it is also a key that tool materials should overcome. Therefore, the user needs to select the tool according to the tool performance of the part material. Such as turning or milling high-strength steel, titanium alloy, stainless steel parts, it is recommended to choose indexable carbide tools with better wear resistance.
2. Select the tool according to the specific use
Selecting tools according to the type of CNC machine, semi-finishing and finishing stages are mainly to ensure the machining accuracy of parts and product quality, and tools with high durability and high precision should be selected. The precision of the tools used in the roughing stage is low, and the precision of the tools used in the finishing stage high. If the same tool is selected for roughing and finishing, it is recommended to use the tool that has been eliminated from finishing during roughing, because most of the tools eliminated from finishing are slightly worn on the edge, and the coating is worn and polished. Continued use will affect the finishing. Machining quality, but less impact on roughing.
3. Select the tool according to the characteristics of the processing area
When the structure of the part allows, a tool with a large diameter and a small aspect ratio should be selected; the end edge of the over-center milling cutter for tool thin-walled and ultra-thin-walled parts should have sufficient centripetal angle to reduce the tool of the tool and the tool part. force. When machining aluminum, copper and other soft material parts, an end mill with a slightly larger rake angle should be selected, and the number of teeth should not exceed 4 teeth.
4. When selecting a tool, the size of the tool should be adapted to the surface size of the workpiece to be processed.
Different workpieces also need corresponding tools for processing. For example, in production, end mills are often used to process the peripheral contours of plane parts; when milling planes, carbide insert milling cutters should be selected; When grooving, choose high-speed steel end mills; when machining blank surfaces or roughing holes, you can choose corn milling cutters with carbide inserts; for some three-dimensional profiles and variable bevel contours, ball-end milling tools is often used. When machining free-form surfaces, since the tool speed of the end of the ball-nose tool is zero, in order to ensure the machining accuracy, the tool line spacing is generally small, so the ball-nose milling cutter is suitable for the finishing of the surface. The end mill is far superior to the ball end mill in terms of surface processing quality and processing efficiency. Therefore, under the premise of ensuring that the part is not cut, when roughing and semi-finishing the surface, try to choose the end mill milling cutter.
The principle of “you get what you pay for” is reflected in the tools. The durability and accuracy of the tool have a great relationship with the price of the tool. In most cases, although the choice of a good tool by the enterprise increases the tool cost, the resulting improvement in processing quality and processing efficiency greatly reduces the entire processing cost. In order to maximize the value of the tool during processing, it is necessary to “combine hard and soft”, that is, choose high-quality processing programming software to cooperate.
On the machining center, all the tools are pre-installed in the tool magazine, and the corresponding tool change actions are carried out through the tool selection and tool change commands of the NC program. Therefore, it is necessary to select the corresponding standard tool holder suitable for the specification of the machine system, so that the CNC machining tool can be quickly and accurately installed on the machine spindle or returned to the tool magazine.
Through the above explanation, I believe that everyone must have a deeper understanding of the selection of machines. In order to do a good job, you must first sharpen your tools. Today, there are a wide variety of tools on the market, and the quality is also uneven. If users want to choose the tools of CNC machining center that suit them, they need to consider more.