In the field of CNC machine center 850 processing, the problem of hitting a knife is a big headache. Device hitting a knife may seem like a trivial matter, but in reality it is a huge hazard. As a high-speed and high-precision automatic precision equipment, the machining center will affect the processing efficiency if it hits the tool, and the more it will cause the overall accuracy of the machining center to decrease, and even the entire tool magazine will become a waste. Therefore, in our daily processing, we must pay attention to the problem of hitting the knife. Understanding the causes of knife collisions and preventing them in advance is an effective way to reduce the occurrence of knife collisions.
Here are some practical solutions to effectively avoid knife collisions
1. Reasonable selection of tools according to different processing categories
Machining centers can complete a variety of procedures, but different processing procedures require the use of different types of tools.
The general principles of tool selection should be followed: easy installation and adjustment, good rigidity, high durability and high precision. On the premise of meeting the processing requirements, choose a shorter tool holder to improve the rigidity of tool processing. When selecting a tool, the size of the tool must be adapted to the surface size of the workpiece to be processed.
When machining the peripheral contour of a plane part, it is recommended to use an end mill.
When milling a plane, it is recommended to choose a cemented carbide insert milling cutter.
For roughening, that is, to process the surface of the blank, it is recommended to use a corn milling cutter with a cemented carbide blade.
Corn milling cutter
Choosing the right tool can make the machining "close together" and avoid the machining deviation caused by the unsuitable tool, which will cause the phenomenon of knife collision.
2. After choosing a good tool, avoid improper operation
Man-made improper operation is also the main cause of knife collision. Some improper operations are often not caused by carelessness, but because of the lack of comprehensive and accurate positioning and grasp of the processing procedures.
Tool measurement error. Mistakes in tool measurement lead to mismatch with machining and tool collision.
Solution suggestion: Choose a reliable tool measuring instrument and use a standardized measuring method.
Wrong selection of wool embryo. When selecting the processing blanks, the actual processing conditions were not considered, the blanks were too large or the blanks were not in accordance with the program setting, which caused the knife to hit.
Solution suggestion: select the blank according to the program setting before processing, and check the blank size, hardness and other data. Choose the tool after fully considering the machining process and the rough condition. It should also be considered for some special situations, such as the thermal deformation of the blank, the machining wear of the tool, and so on.
Installation error. Improper clamping during the machining process can also cause tool collisions.
Solution suggestion: Combine the actual machining situation during the clamping process to avoid operation errors.
3. The automation level of the machining center is very high. Although the numerical control technology has brought a lot of convenience to the machining operation, there are also some troubles lurking at the same time, such as the collision of the knife caused by the programming error.
After the program is written, check the program to avoid parameter errors. The program list is updated in time, and the corresponding inspection is carried out. Check the detailed data of the program before processing, such as the time and date the program was written, and make sure that the new program can run normally before processing. When necessary, test pieces can be carried out first, and then batch processing and production can be carried out after the test pieces are qualified.
There is nothing trivial about cutting a knife in a machining center, and it is a good recipe to be careful and cautious in advance. Understand the causes of machine tool collisions, and carry out targeted prevention according to the actual processing conditions, so as to obtain a reasonable solution to the problem of tool collisions.
