General steps of CNC milling machine processing

Programmers in the process analysis, to have machine instructions, programming manual, cutting with the scale, standard tools, fixture manual and other information, according to the material of the workpiece is processed, contour shape, processing accuracy, choose the appropriate CNC milling machine, then about the steps of CNC milling machine processing you know what content?

First, the reasonable selection of machine tools

When processing parts on CNC milling machine, there are generally two situations. One kind of situation: there are parts drawing and blank, to choose the CNC machine tool suitable for processing the parts. Another situation: has a CNC machine tool, to choose suitable for processing on the machine parts. In any case, the main factors to consider are the material type of the blank, the complexity of the contour of the parts, the size, the machining accuracy, the number of parts, the heat treatment requirements, etc. Summing up there are three points :(1) to ensure the technical requirements of processing parts, processing qualified products. (2) It is conducive to improving productivity. (3) Reduce production costs and processing costs as far as possible.

Second, numerical control processing parts technology analysis

Numerical control milling machine processing technology analysis involves a wide range, in this only from the possibility of numerical control processing and convenience of two aspects to be analyzed.

1. The size data on the parts drawing should be given in line with the principle of convenient programming

(1). The dimension marking method of part drawing should adapt to the characteristics of numerical control machining. On the part drawing of numerical control machining, the dimension should be noted with the same reference or the coordinate dimension should be given directly. This marking method, even in programming, is also convenient for the coordination between dimensions, which brings great convenience in maintaining the consistency of design datum, process datum, test datum and programming origin setting. Because the parts designers generally in the dimension marking more consideration of assembly and other performance aspects, and have to use local scattered marking method, which will bring a lot of inconvenience to the process arrangement and CNC machining. Because the accuracy of NC machining and repeated positioning is very high, and the performance will not be destroyed due to large accumulated errors, the local scattered marking method can be changed to the marking method with the same reference size or directly giving the coordinate size.

(2). The conditions of the geometrical elements that constitute the contour of the parts should be sufficient

In manual programming, base points or node coordinates are calculated. In automatic programming, all the geometric elements that make up the contours of a part are defined. Therefore, when analyzing the part drawing, it is necessary to analyze whether the given conditions of geometric elements are sufficient. For example, a circular arc and a straight line, or a circular arc and a circular arc are tangent to each other on the drawing, but according to the given size on the drawing, when calculating the tangent condition, it becomes the state of intersection or separation. Because of the insufficiency of the geometrical elements of the components, it is impossible to start programming. This situation should be resolved in consultation with the part designer.

2. the parts of the processing parts of the structure of the process should conform to the characteristics of CNC processing

(1). The cavity and shape of the parts should adopt uniform geometric type and size. This can reduce the size of the tool and tool changing times, so that the programming is convenient, production efficiency is improved.

(2). The size of the inner groove fillet determines the size of the tool diameter, so the inner groove fillet radius should not be too small. The quality of parts technology is related to the height of the processed parts and the size of the radius of the transfer circle.

(3). When the bottom plane of the parts is milling, the radius of the fillet at the bottom of the groove should not be too large.

(4). Uniform benchmark positioning should be adopted. In numerical control machining, if there is no uniform datum positioning, will lead to the reinstallation of the workpiece after the processing of the two surface contour position and size is not coordinated phenomenon.

In addition, it should also analyze whether the machining accuracy and dimensional tolerance required by the parts can be guaranteed, whether there are redundant dimensions that cause contradictions or closed dimensions that affect the working procedure arrangement.

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