How to improve the precision and quality of CNC mold processing

How to improve the accuracy and quality of CNC mold processing

with the rapid development of China's economic construction, with the improvement of people's living standards, China's construction industry has developed rapidly and the demand for aluminum profiles has been increasing. Therefore, the demand for aluminum alloy extrusion mold design, manufacturing and production has also increased.

aluminum profile products are widely used in all walks of life, and the products are constantly diversified and complicated, and the processing accuracy of the products is also getting higher and higher. The extrusion die is the basis of the extrusion process, which not only determines the shape, dimensional accuracy and surface state of the extrusion product. The quality requirements are getting higher and higher, and the processing requirements for molds are also increased. Machining accuracy is the biggest requirement of machining, so how to effectively improve the machining accuracy of the mold has become a difficult problem to solve today.

1. 1 mold processing quality includes machining accuracy and surface quality

machining accuracy is the ideal geometry of the actual size, shape and position of the surface of the part after machining. the degree of conformity of the parameters. The ideal geometric parameter is the average size for the size; For the geometric shape of the surface, it is an absolute circle, cylinder, plane, cone and straight line; For the mutual position between surfaces, it is absolutely parallel, vertical, coaxial, symmetrical, etc. The deviation value between the actual geometric parameters of the part and the ideal geometric parameters is called machining error.

both machining accuracy and machining error are terms for evaluating geometric parameters of machined surfaces. The machining accuracy is measured by tolerance level, and the smaller the grade value, the higher the accuracy; The processing error is represented by numerical value, and the larger the value, the greater the error. High machining accuracy is that the machining error is small, and vice versa.

The actual parameters obtained by any machining method will not be absolutely accurate. From the function of the part, as long as the machining error is within the tolerance range required by the part drawing, it is considered that the processing accuracy is guaranteed.

The quality of the machine depends on the processing quality of the parts and the assembly quality of the machine, the machining quality of the part includes the machining accuracy and surface quality of the part. The machining accuracy refers to the actual geometric parameters after the part is processed (Size, shape and position)Degree of conformity with ideal geometric parameters. The difference between them is called machining error. The size of the machining error reflects the level of machining accuracy. The larger the error, the lower the machining accuracy, the smaller the error, the higher the machining accuracy.

2. Main aspects affecting machining accuracy

2. 1 dimensional accuracy

refers to the degree to which the actual dimensions of the machined part are in line with the tolerance band center of the part size.

dimensional accuracy is controlled with dimensional tolerances. Dimensional tolerance is the amount of variation allowed by the size of the part in cutting processing. In the case of the same basic size, the smaller the dimensional tolerance and the smaller, the higher the dimensional accuracy.

2. 2 Shape Accuracy

refers to the degree to which the actual geometry of the surface of the machined part conforms to the ideal geometry. The items for evaluating the Shape Accuracy include 6 items such as straightness, flatness, roundness, cylindrical degree and line profile. The shape accuracy is controlled by the shape tolerance. The shape tolerances are divided into 13 accuracy grades except for the round and cylindrical degrees, and the rest are divided into 12 accuracy grades. The highest level 1, the lowest level 12.

2. 3 position accuracy

refers to the actual position accuracy difference between the surfaces concerned by the part after processing. The items to assess the accuracy of the position include eight items: parallelism, verticality, inclination, coaxiality, symmetry, position, circle beating and full beating. The position accuracy is controlled by the position tolerance, and the position tolerance of each project is also divided into 12 accuracy grades.

3, the relationship between dimensional accuracy, Shape Accuracy and position accuracy

usually when designing machine parts and specifying the machining accuracy of parts, attention should be paid to controlling the shape error within the position tolerance, and the position error should be less than the dimension tolerance. That is, the Shape Accuracy requirements of precision parts or important surfaces of parts should be higher than the position accuracy requirements, and the position accuracy requirements should be higher than the dimensional accuracy requirements.

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