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How to improve the precision of mould machining effectively

ABIS Mold Technology Co.,Ltd Updated: Oct 19, 2018

                       How to improve the precision of mould machining effectively

   With the rapid development of China's economic construction and the improvement of people's living standards, China's construction industry develops rapidly, and the demand for aluminum profiles keeps increasing. Therefore, the demand for aluminum extrusion die design, manufacturing and production also keeps increasing.

   Aluminum profile products are widely used in all walks of life, and the products are developing towards diversification and complication continuously, and the requirements on the processing precision of products are higher and higher.The extrusion die is the foundation of the extrusion process, which not only determines the shape, size accuracy and surface state of the extrusion product.Quality requirements are getting higher and higher, and the processing requirements of the mold are also improved.Machining accuracy is the biggest requirement of machining, so how to effectively improve the machining accuracy of mold has become a difficult problem to be solved.

1.1 mold processing quality includes machining accuracy and surface quality

   Machining accuracy is the degree of conformity between the actual dimensions, shapes and positions of the machined parts and the ideal geometrical parameters required in the drawings.The ideal geometric parameter, in terms of size, is the average size;In terms of surface geometry, it means absolute circle, cylinder, plane, cone and line.For the interposition of the surface, it is absolutely parallel, vertical, coaxial and symmetric.The deviation value of actual and ideal geometrical parameters of the part is called machining error.

   Machining accuracy and machining error are terms used to evaluate geometrical parameters of machined surfaces.The machining accuracy is measured by the tolerance grade.Machining error is represented by numerical value. The larger the numerical value, the larger the error.High machining accuracy means small machining error and vice versa.

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

   The quality of the machine depends on the machining quality of the part and the assembly quality of the machine. The machining quality of the part includes the machining accuracy of the part and the surface quality.The difference between them is called machining error.The machining error reflects the machining accuracy.The larger the error, the lower the machining accuracy, the smaller the error, the higher the machining accuracy.

2. Main factors affecting machining accuracy

2.1 dimensional accuracy

   Refers to the degree of conformity between the actual size of the processed part and the tolerance center of the part size.

   Dimensional accuracy is controlled by dimensional tolerance.Dimensional tolerance is the allowable variation of part dimensions in machining.In the case of the same basic size, the smaller the dimensional tolerance and the higher the dimensional accuracy.

2.2 shape accuracy

   Refers to the degree of conformity between the actual geometric shape of the machined part surface and the ideal geometric shape.The items to evaluate the shape accuracy include 6 items, such as straightness, planeness, roundness, cylindrical degree and line contour.Shape accuracy is controlled by shape tolerance. All shape tolerances are divided into 12 precision grades except 13 precision grades of roundness and cylindrical degree.Level 1 is highest and level 12 is lowest.

2.3 position accuracy

   Refers to the difference in actual position accuracy between the machined parts about the surface.The items for evaluating the position accuracy include eight items such as parallelism, perpendicularity, inclination, coaxiality, symmetry, position, round and full jump.Position accuracy is controlled by position tolerance, which is divided into 12 precision grades.

3 relation between dimensional accuracy, shape accuracy and position accuracy

Generally, when designing machine parts and defining machining accuracy, it should be noted that the shape error should be controlled within the position tolerance, and the position error should be less than the size tolerance.That is to say, the precision of precision parts or important surfaces of parts should be higher than the precision of position, and the precision of position should be higher than the precision of dimension.

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