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Precautions for CNC programming and a brief description of CNC machining technology

by:Foxron     2021-11-29
There are many contents of CNC machining, including many aspects, especially in the machinery industry, this term is often used. What are the CNC machining processes? What are the precautions for CNC programming? These are all issues in this respect, and they are also worthy of consideration. Let's introduce them in detail below. CNC: It is the abbreviation of Computer numerical control in English, which means computer numerical control machine tool, referred to as CNC machine tool. It is an automatic machine tool controlled by a program. The so-called CNC programming refers to the programming of CNC machine tools. 1. Precautions for CNC programming (1) When the workpiece is too high, you should use different length cutters to roughen it in layers. After roughing with a big knife, you should use a small knife to remove the remaining material. (2) Use flat-bottomed knives to process planes, and use less ball knives to reduce processing time; if there is an inclination and it is an integer, use an inclination knife to process. (3) Set tolerances reasonably to balance the machining accuracy and computer calculation time. Do more procedures to reduce the time of empty tools. (4) If the rough material has high hardness, choose up-cut milling; if the rough material has low hardness, choose down milling. Roughing up milling, finishing down milling. (5) The tool material has good toughness and low hardness, which is suitable for rough machining. The tool material has poor toughness and high hardness and is suitable for finishing. 2. CNC machining process (1) Part clamping method and fixture selection. The clamping method of the machined parts on the CNC machine tool should also choose the positioning datum and the clamping plan reasonably. When selecting the precise datum, it is generally necessary to follow the 'standard uniformity' In addition to these two principles, we have to consider the two principles of '' and 'benchmark coincidence': a. Try to complete all surface processing in one positioning and clamping. Therefore, it is necessary to choose the one that is convenient for all surfaces to be processed. Targeting. b. When the workpiece is clamped once, it should be able to complete the processing of all surfaces of the workpiece. c. When determining the placement position of the workpiece on the workbench, consideration should be given to the processing of each station, the length of the tool and the impact of the rigidity of the tool on the processing quality. d. The fixtures used in the control processing should be assembled from common components as much as possible, and can be adjusted to shorten the production preparation cycle. (2) Arrangement of the processing sequence When arranging the processing sequence, the basic principles must be followed, including 'face first, hole seconda. According to the tool centralized process processing, to avoid repeated use of the same tool multiple times, reduce the number of tool changes and time. b. For the hole system that requires high coaxiality, after one positioning, the processing of the hole system should be completed, and then the hole system of other coordinate positions should be processed, which can eliminate the error caused by repeated positioning and improve Coaxiality of the hole system. c. Choose to determine the tool point and tool change point. Once determined, it is not suitable to change. (3) The planning of the tool feed path The feed path here is the movement path of the tool relative to the part being processed in exponential control processing. When planning the feed route, certain principles must be followed. Specifically, the processed parts can obtain good machining accuracy and surface quality, the numerical calculation work is simplified and the feed route is shortened. Unless specified, the article is the original text of Tiecheng Machinery CNC Machining Center, welcome to reprint! Please indicate the address of this article for reprinting, thank you. Article source: http://www.wxdtc.com/
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