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Introduction to the advantages and disadvantages of nc machining, the principle of process and arrangement

by:NJPE     2020-06-20
Nc precision machining is a process, it is widely used in machinery industry, it is to point to in nc machine tool parts processing process. Are used in nc machining, CNC machine tools, CNC system, CNC machine tool is a kind of using computer to control the machine, the nc system of instruction is according to the requirements of the workpiece material, processing by the programmer, the characteristics of machine tool and system the instruction format specified in the establishment of a set of instructions. 1. The advantages and disadvantages of numerical control processing advantages: ( 1) Much less number of tooling, processing complicated shape parts do not need complicated equipment. If you want to change the shape and size of the parts, only need to modify the parts processing procedures, apply to new product development and modification. ( 2) Stable machining quality, high machining accuracy, high repeat precision, aircraft to meet the demand of the processing. ( 3) Many varieties, small batch production situations production efficiency is high, can reduce the production preparation, machine tool adjustment and process the test of time, and due to the use of optimal cutting quantity and reduces the cutting time. ( 4) Conventional method is difficult to machining the complexity of surface, can even machining parts of some cannot be observed. Disadvantages: machine tool equipment is expensive, require maintenance personnel with high level. 2. The nc machining process ( 1) Dimensioning shall accord with the characteristics of nc precision machining in CNC programming, all the size and position of point, line and plane is programming the origin as a benchmark. So best directly coordinates are given in detail drawing size, or as far as possible to the same benchmark note size. ( 2) Conditions of geometric elements should be complete and accurate in the programming, the programmer must fully grasping the geometric elements of composition parts contour parameters and the relationship between geometric elements, because when the automatic programming to outline all of the metal parts geometry elements are defined, the manual programming to calculate the coordinates of each node, no matter what is not clear or uncertain, programming can be performed. But due to component design personnel in the design process to be thoughtless or ignored, often appear parameter is not complete or not clear, such as arc and straight line, arc and arc tangent intersection or phase is near. So when the review and analysis of drawings, must carefully, found the problem timely contact with designers. ( 3) Reliable positioning base in nc precision machining, the machining operations tend to be concentrated, with the same reference positioning is very important. So often you need to set up some auxiliary datum, or add some process convex platform on the blank. ( 4) Unified geometric type or size parts of shape, inner chamber had better use unified geometric type or size, so that we can decrease The Times of change knife will also control application program or special program to shorten the length of the program. The shape of the parts as symmetrical as possible, convenient to use the mirror to the processing function of nc machine tools to programming, to save time. 3. The arrangement of the nc machining principle ( 1) On the whole process does not influence the process of positioning and clamping. ( 2) After the first, the first internal cavity machining, shape after processing. ( 3) In the same installing or using the same cutting tool machining process, the best is continuously. ( 4) Installed at the same time, the workpiece rigid impact should be on the smaller process. ( Figure/http://www. wxdtc。 com/)
Getting doesn't have to be expensive, time-consuming, or difficult. It all comes down to the right method and a cnc aluminum machining parts in place.
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