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How To Improve The Precision Of Die Machining Effectively
Sep 29, 2017

With the rapid development of China's economic construction, the improvement of people's living standards, China's construction industry has developed rapidly, the increasing demand for aluminum, therefore, demand for aluminum extrusion die design, manufacturing and production is also increasing.
The products of aluminum profile are widely used in all walks of life, and the products are constantly being diversified and complicated, and the processing precision of products is higher and higher. Extrusion die is the basis of extrusion process, which not only determines the shape, dimension and surface condition of the extruded product. The quality requirements are higher and higher, and the processing requirements of the die are also improved. Machining accuracy is the biggest requirement of processing, so it is a difficult problem to improve the machining accuracy of the die.
1.1 mould processing quality includes machining accuracy and surface quality
The machining accuracy is the degree of conformity of the actual size, shape and position of the three geometrical parameters of the parts surface after machining. The ideal geometric parameter, for size, is the average size; For surface geometry, it is the absolute circle, cylinder, plane, cone and line; In the case of the surface, it is the absolute parallel, vertical, coaxial, symmetry and so on. The deviation of actual geometrical parameters and ideal geometric parameters is called machining error.
Machining accuracy and machining error are the terms for evaluating geometric parameters of machining surface. The accuracy of machining is measured by the tolerance level, the smaller the grade value, the higher the accuracy; The processing error is indicated by numerical value, the larger the value, the greater the error. The machining accuracy is high, 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 parts, as long as the machining error is within the tolerance range required by the part drawing, the machining accuracy is considered.
Machine depends on the quality of the machining quality of parts and assembly quality of the machine, spare parts processing quality includes parts processing precision and surface quality refers to two parts machining precision parts processing after the actual geometric parameters (size, shape and location) consistent with ideal geometric parameters. The difference between them is called machining error. The size of machining error reflects the accuracy of machining. The greater the error, the lower the accuracy, the higher the accuracy.
The main aspects of processing precision are affected
2.1 dimensional accuracy
The actual size of the parts after processing is the degree of conformity with the center of the tolerance zone of the part size.
Dimension accuracy is controlled by size tolerance. The dimension tolerance is the allowable variation of component size in machining. In the case of the same basic size, the size tolerance and the smaller, the higher the dimensions.
2.2 shape accuracy
The actual geometrical shape of the surface of the processed parts corresponds to the ideal geometric shape. The project that evaluates the shape precision has the straightness, the plane degree, the circle, the cylindric, the line outline and so on 6. The shape precision is controlled by the shape tolerance, the shape tolerances are different, except for the roundness and the column degree of 13 accuracy grades, the remaining average points are 12. Level 1 is highest, grade 12 is lowest.
2.3 location accuracy
Refers to the difference between the actual position accuracy of the parts concerned after processing. The accuracy of the evaluation of the project has parallel degree, vertical degree, inclination, coaxial degree, symmetry degree, position, circular beat and total beat. The position accuracy is controlled by position tolerance, and the location tolerance of each destination is divided into 12 precision grades.
The relationship between dimension accuracy, shape accuracy and location accuracy
In the design of machine parts and the machining accuracy of parts, the shape error should be controlled in the position tolerance and the position error should be less than the tolerance of the dimensions. It is the important surface of precision parts or parts, its shape precision requirement should be higher than the position accuracy requirement, the position precision requirement should be higher than the dimensional precision requirement.

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