Analysis of CNC machining parts processing technology

The dimensional data information on the parts sample drawing of the CNC machining parts processing technology should meet the standard of convenient programming

1. The size indication method on the part drawing should be integrated with the characteristics of Beijing CNC machining. On the CNC machining part drawing, the size should be quoted on the same basis or the coordinate size should be obtained immediately. This

The method of class marking is not only conducive to programming, but also conducive to the harmony between the dimensions, and it is quite convenient to maintain the consistency of the design benchmark, process benchmark, inspection benchmark and programming starting point. Because the parts design staff generally consider the application characteristics of installation and other aspects in the size marking, and have to choose a partially decentralized marking method.

2. CNC precision metal processing in Dongguan City will cause a lot of trouble for process allocation and CNC processing. Because the precision and repeatability of CNC machining are very high, it is not easy to

3. Large cumulative deviations will destroy the application characteristics, so part of the decentralized marking method can be changed to the same reference citation size or the coordinate size marking method immediately obtained.

4. The standard of geometrical figure elements that make up the parts processing contours should be sufficient

In manual programming, the coordinates of the reference point or connection point should be measured. In fully automatic programming, all the geometrical elements that make up the contour of the part should be defined. Therefore, when analyzing the part drawing, it is necessary to analyze whether the standard of the geometrical figure element is sufficient. For example, arcs and parallel lines, arcs and arcs are the tangent of the circle on the sample drawing, but according to the size obtained on the drawing, when estimating the tangent standard of the circle, it becomes a situation of intersection or separation. Because of the inadequate standard of the geometrical figures of the components, it is impossible to start programming. When encountering this kind of situation, you should discuss with the part designer.

(2) The structural craftsmanship of each processing position of the part should conform to the characteristics of CNC machining

1. It is best to use uniform geometric types and sizes for the inner wall and appearance design of parts. In that way, the specification and model of CNC blades and the frequency of tool change can be reduced, programming is convenient, and the economic efficiency of manufacturing is improved.

2. The size of the rounded corners of the shaft determines the size of the CNC blade diameter, so the arc half of the shaft should not be too small. The pros and cons of the workmanship of the parts are related to the height of the processed contour and the size of the arc semi-warp.

3. When the part is cutting the bottom plan view, the arc semi-warp r of the groove bottom should not be too large.

4. A unified benchmark should be used for precise positioning. In CNC machining, if there is no uniform reference for precise positioning, it will be guided by the reassembly of the product workpiece.

The two surface contour parts and dimensions after processing are not in harmony. Therefore, it is necessary to prevent the above-mentioned problems and ensure the accuracy of the relative position after the second clamping and processing. How to choose the CNC processing should use a unified reference for precise positioning.

It is best to have suitable holes on the parts as the reference holes for precise positioning. If not, set the process holes as the reference holes for precise positioning (such as lifting the process lug on the blank or the capacity to be milled in the process flow afterwards Set the craft hole on it). If the craft hole cannot be made, at least the finished surface layer should be used as a unified benchmark to reduce the deviation caused by the second clamping.

In addition, how to calculate the CNC processing fee should also analyze whether the required processing precision and dimensional tolerances of the parts can be guaranteed, whether there are unnecessary dimensions that cause contradictions or closed dimensions that endanger the distribution of the process flow, etc. .