In the actual machining process, human factors and operating experience, to a large extent, will affect the final processing quality. Let’s see the recap from our engineers with more than 12 years experience.
1. How to classify CNC precision machining process?
The method of tool centralization is to divide the working procedure according to the tool used, with the same tool CNC machining finished parts on all the parts that we can complete. Use the second knife and the third to do what they can. In this way, it can reduce the number of tool changes and compress the space-time to reduce the unnecessary positioning error. For CNC machining parts with a lot of content, we can divide the processing part into several parts according to its structural characteristics, such as internal shape, surface.
For CNC machined parts prone to deformation, they may deform after rough machining and need to be rectified. So, generally speaking, where advanced CNC machine shop carries out rough, and precise machining, we should seperate them. To sum up, in the division of the process, the precision machine company should consider many factors. Such as, the structure and technology of the high precision machined parts, the function of the machine tools, processing contents, installation times, and our CNC machining capabilities. Besides, we should suggest the principle of process concentration or dispersion according to the actual situation, and it must be reasonable.
2. What principles should the precision CNC machining order follow?
We should consider the processing sequence according to the structure of precision machined parts and blank condition, and the need to locate the clamping. And the emphasis is not destroying the rigidity of precision CNC machined components. In general, the order should follow these principles.
The CNC machining of the previous procedure can not affect the positioning and clamping of the next process, which is interwoven with general machine tool processing procedures should be considered comprehensively. The processing sequence of the inner cavity is advanced, and after that, we process the outer shape. In the same positioning, clamping or quality CNC machining process of the same knives had better be connected to reduce the number of repeated positioning, changing the number of knives and moving the number of pressing plates. In the same installation of more than one process, we should arrange it for the workpiece rigidity of the small destruction of the process.
3. How to decide the clamping method of precision CNC machined components?
Firstly, strive to precision machined part design, process, and programming calculation of the unity of the benchmark. Secondly, the machining vendor should try best to reduce the number of clamping and process all the surfaces of machined components after one positioning. Thirdly, avoid using the manual adjustment plan. Last but not least, the jig should be open, its positioning, clamping mechanism can not affect the cutter (such as collision). In this case, precision CNC machining company can use a vice or add base plates.
4. How to determine knifepoint reasonably?
The knifepoint can be processed in high precision machined components. But, pay attention to the position must be the benchmark or has been processed. Sometimes, after the first step, the precision machining CNC destroys the knifepoint . Then, it is tough to find the cutting point of the second and later procedure. So, the precision CNC machining company should set up a relative location on the position where it has a relatively fixed size with the locating datum place in the first procedure. Then, workers can find the original cutting point according to the relative position between them during CNC machining operations.
In general, the relative position of the knife locates on a machine tool bench or fixture. The selection principle is as follows. At first, correction is easy, and it’s convenient to program. Then, there is little error in tool set. Lastly, it’s available and convenient to check during CNC machining processes.
5. How to choose the tool route?
The tool path is the path and direction of the tool relative to the CNC machined parts in the process of exponential control. The reasonable choice of the machining route is significant. It is closely related to the precision and surface quality of the CNC machined components. In determining the knife route is mainly considered as follows. First of all, ensure the precision and accuracy of quality CNC machining parts. Then, it should be convenient to make a numerical calculation and reduce the programming workload.
The convenient numerical calculation, reduce the programming workload. Seek the shortest CNC machining route, reduce the empty tool time to improve the efficiency. Minimize the number of segments. To ensure the roughness of the part contour surface after computer numeric control machining, we should arrange the final contour for continuous processing with the last cutter. Machining centers also need to consider the path of cutting tools (in and out). Try to minimize the stopping at the contour because the sudden change of cutting force causes elastic deformation and leave tool marks. Also, avoid cutting vertically on the contour surface, which will scratch CNC machined parts.
6. How to monitor and adjust during metal CNC machining?
After the alignment and program debugging of precision CNC machined components, it can enter the automatic processing stage. In the process of automatic machining, the operator of CNC machines should monitor the cutting process. It aims to prevent abnormal cutting, which may cause the quality problems of CNC machined components and other accidents.
7. What is the function of the machining procedure sheet, and what includes in it?
The specific description of the processing procedure, the purpose is to let the operator clear the content of the program, clamping, and positioning. Each processing procedure selected by the tool should pay attention to the problem. In the machining program list, it should include 3D CAD file, programming file name, part name, clamping sketch, program name, cutting tools used for each program, maximum cutting depth, machining nature (rough or finishing), theoretical processing time, etc.
8. What preparation should be made before CNC programming?
After determining the process, engineers should understand these before programming.
First of all, it’s the CNC-machine workpiece clamping method. Then, know the blank size of CNC machined components to determine the scope of processing or whether multiple clamping is required. Also, the material of precision machined components is vital to choose cutting tools. Of course, making plastic and metal parts need different tools. At last, know all cutter types in stock, avoid modifying the program due to the lack of tool. If you must use this tool, you can prepare in advance.
9. What are the principles for setting safe heights in programming?
In general, the safety height should be higher than the highest side of the island. Or set programming zero points at the top of the plane to minimize the risk of knife collisions.
10. After complying the tool path, why do I need to do post-processing?
Different machine tools recognize different address code and the NC program format. To ensure the regular running of the program, we need to select the correct post-processing format according to the machine tool.
11. Why and how can we use surface finish for CNC milled and CNC turned parts?
Surface finish is a process of forming a layer on the surface of the matrix material, which has different physical and chemical properties from the matrix. The purpose of surface treatment is to meet the requirements of corrosion resistance, wear resistance, decoration or other special functions. The surface finish methods include bead blasted, powder coated, electropolishing, electroplate, oxidation processing and so on.
Bead blasted parts have a uniform surface finish of matte or smooth and no tool marks on their surface. This process is mainly used for aesthetic purposes. And powder coated components have a thin layer of protective polymer paint which has wear and corrosion resistance. There are a wide ranging of colors for customers to choose. No matter you want CNC milled or CNC turned parts, rapid prototypes or mass production runs, send the CAD file and contact us to get a free quote. NDA is available if needed.