How to improve the surface quality of CNC machining parts?

Author: MULAN - Plastic Molding Manufacturer

CNC processing">CNC processing can solve the processing problems of some large and small batch processing parts in the needs of industrial production. The processing of some precision parts can also be completed by CNC machining centers, but this improves the surface quality of parts. In practice During the operation process, how to improve the surface quality of CNC machining parts? 1. Reasonably design the cut-in and cut-out route. When using the CNC machining center to process parts, the cut-in and cut-out route should be designed to optimize the cutting angle of the machine tool. In order to reduce The effect of the knife marks, ensuring that the quality of the surface is not compromised, requires planning of the knife entry.

The entry point of the tool is mainly from the peripheral extension of the part, thus ensuring a smooth contoured surface. The cutting tool should try to choose a smaller feed rate, so that it can keep cutting at a slow speed, so that the cutting can be smoothly transitioned, so as to ensure the cutting quality. 2. Correctly choose the cutting processing method. When using a CNC milling machine for processing, there are two methods: down milling and up milling.

The finishing effect of down milling is better than that of up milling. Therefore, in the processing of parts, if conditions permit, try to choose down milling to improve the surface quality of parts. In the turning of shaft parts, it is also necessary to choose the same turning tool as much as possible for the processing of different journals, so as to better reduce the marks caused by the tool connection.

3. Use new high-efficiency tools The efficiency and performance of CNC machining centers are inseparable from tools. For the processing of parts with high precision requirements, it is not only necessary to pay attention to the perfect process, but also to select and use new high-efficiency cutting tools. Today's tool optimization design can use new tool concepts to more reasonably solve the problems of machining safety, precision, surface roughness, high-speed cutting, and the ability to optimize cutting paths.

4. Adopt a good CNC machining program to optimize the CNC machining program and provide good CNC data for processing, which can better improve the quality. Compared with ordinary machine tools, CNC machining centers not only require operators to have a higher level of operation in the processing of parts, but also need to have a higher level in programming and process analysis. In order to ensure machining accuracy, it is necessary to optimize and streamline the program in order to improve production efficiency.

First, we need to find out the reason for the low accuracy of the surface, and then start to solve it. Jiezhong CNC machining center will tell you the possible reasons: 1. The cutting parameters are unreasonable, and the surface of the workpiece surface is rough. 2. The cutting edge of the tool is not sharp. 3. The tool clamping is too long, and the cutting edge is too long.

4. Chip removal, air blowing, and oil flushing are not good. 5. Program the way of cutting tool (down milling can be considered as much as possible). 6. The workpiece has burrs.

The above are the reasons for the low accuracy of the surface of the CNC machining center. For these reasons, we can take the following measures to improve: 1. Cutting parameters, tolerances, allowances, and speed feed settings should be reasonable. 2. The tool requires the operator to inspect and replace it irregularly. 3. When clamping the tool, the operator is required to clamp it as short as possible, and the blade should not be too long.

4. For the downcutting of flat knife, R knife and round nose knife, the setting of speed and feed should be reasonable. 5. The workpiece has burrs: it is directly related to our machine tool, cutting tool and cutting method. Therefore, we need to understand the performance of the machine tool and make up for the edge with burrs.

The above is the analysis of the reasons for the low precision of the surface of the CNC machining center and the introduction of the improvement methods. There are many common problems, such as workpiece overcutting, tool setting problems, etc. To solve these problems, use the above method to find out the reasons first, and then find solutions.