Matters needing attention in CNC programming and brief introduction of CNC processing technology
There are many contents of numerical control processing, including many aspects, especially in the machinery industry, which is often used. What are the numerical control processing technologies? What are the precautions for CNC programming?
These are all problems in this area and are worth thinking about. Let's introduce them in detail.
CNC: is the abbreviation of English Computer numerical control, meaning Computer digital control machine tool, referred to as CNC machine tool, is a program-controlled automatic machine tool, 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, it should be cut in layers with knives of different lengths. After the workpiece is cut in layers with a broadsword, the remaining materials should be removed with a knife. (2)
Flat knife is applied to process plane, while Ball knife is used less, so as to reduce processing time;
If there is a slope and it is an integer, use a bevel knife to process it. (3)
Reasonable tolerance is set to balance the machining accuracy and computer calculation time, to do more processes and to reduce empty knife time. (4)Blank material has high hardness, and reverse milling is selected; Blank material hardness is low, choose down milling. Rough machining reverse milling, finish machining forward 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, which is suitable for finish machining. 2. Numerical control processing technology (1)
Parts clamping method and fixture selection the clamping method of parts processed on CNC machine tools should also reasonably select the positioning Benchmark and clamping scheme. When selecting the precise benchmark, generally, we should follow the two principles of 'benchmark unification' and 'benchmark coincidence'. In addition to these two principles, we should also consider: a.
As far as possible, all surfaces should be processed in one positioning clamping. Therefore, it is necessary to select a positioning method that is convenient for all surfaces to be processed. B.
When the workpiece is clamped at one time, all surfaces of the workpiece should be processed. c.
When determining the placement position of the workpiece on the workbench, consideration should be given to the influence of the machining of each station, the length of the cutter and the rigidity of the cutter on the machining quality. d.
Fixtures used in controlled processing should be assembled by common components and adjustable to shorten the production preparation cycle. (2)
The arrangement of processing sequence when arranging the processing sequence, the basic principles must be observed, including 'first face and then hole', 'first coarse and then fine', etc. In addition to these basic principles, we should also follow the following principles: a.
According to the tool centralized process processing, avoid repeated use of the same tool, reduce the number and time of tool change. B.
For hole systems with high coaxial requirements, the hole systems at other coordinate positions should be processed after all the processing of the hole system is completed after one positioning, in this way, errors generated during repeated positioning can be eliminated and the coaxiality of the hole system can be improved. c.
Choose to determine the knife point and change the knife point. Once it is determined, it should not be replaced. (3)
Planning of tool feed route the feed route here refers to the movement track of the tool relative to the machined parts in numerical control machining.
When planning the feed route, certain principles should also be followed. The specific ones are: to ensure that the processed parts can obtain good machining accuracy and surface quality, the numerical calculation is simplified and the feed route is minimized.
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