How to control the accuracy of mechanical parts in the process of aluminum oxidation treatment? If there is a precision request for the thickness process dimension of fine mechanical parts, the process size or negative difference dimension of the machined parts can be increased according to the accurate size after oxidation treatment, so as to ensure that the fine and dense machined parts meet the process requirements on the drawing after the oxygenation treatment. In the machining process of mechanical parts, not only the paper size thickness has precision, but also the size request of fine hole, step, hole to edge, etc., which is the same as the processing method of thickness request.
Aluminum oxidation has an impact on the accuracy of mechanical parts, but it can be controlled in the machining process of mechanical parts, which can ensure and meet the process requirements on customer drawings!
The content of mold precision includes four aspects: dimensional accuracy, shape accuracy, position accuracy and appearance accuracy. Because of the working time of the mold, the upper and lower die position accuracy is the most important among the four kinds of precision.
Mold precision is to serve the accuracy of products, high-precision products must be guaranteed by higher precision molds, mold accuracy generally must be higher than the product accuracy of 2 or more levels.
Methods of improving die precision
1。 The precision guarantee of mould processing equipment
2。 Precision requirements of parts in mould manufacturing
①。 Die material accuracy requirements
The processing tolerance of die steel should be controlled within 300×300 + 0.005-0 ± 0.005300×500 + 0.01-0 ± 0.01500×800 + 0.01-0.01 ± 0.015800×1200 + 0.02-0.02 ± 0.02. Precision requirements of mould parts
a。 The precision of Sumi series is within 0020.002mm, and the precision of guide sleeve can be controlled.
b。 The edge forming punch is made of Misumi standard material: SKD-11, hardness: 60-62hrc, and the edge shape is: dregth, which is usually used to form the inner hole or cylinder shape of products. The precision of punching needle can be controlled within ± 0.01mm, and it can be about 2um for special requirements, and keep mirror like.
3。 The size of die gap is the main basis of die design and manufacturing accuracy. In order to ensure the accuracy of product size and shape position, as well as the product quality (such as the cross-section quality and burr height), the gap between the concave and convex dies must be ensured.
4。 The requirements of die construction precision are as follows. Luo Baihui said that from the perspective of processing and assembly, the accuracy of mold base mainly includes the following aspects:
a。 The size and position of the upper and lower plane of the template are consistent;
b。 Flatness and parallelism of large plane of formwork;
c。 Perpendicularity of guide hole to large plane;
d。 Perpendicularity between adjacent sides of formwork;
e。 The fitting accuracy between guide pillar and guide sleeve.
The main methods to ensure the accuracy of mold base are as follows:
a。 The one-time processing method is that after the large plane processing of the template is completed, the upper and lower templates are clamped together, and the plane dimensions and guide holes of two templates are processed at one time.
b。 One of the four guide holes is deviated from the symmetrical position to ensure the assembly orientation of the die.
c。 Datum is used to calibrate the table.
d。 Guide pillar and guide sleeve with high matching precision are adopted.
e。 Improve the machining accuracy of parts.
②。 From the perspective of machining and assembly, the accuracy of punch mainly includes:
a。 The shape and size accuracy of punch;
b。 Perpendicularity between adjacent sides of punch.
③。 From the perspective of processing and assembly, the accuracy of female die mainly includes:
a。 The accuracy of shape and dimension of female die;
b。 Perpendicularity between adjacent sides of die;
c。 Perpendicularity of die side to large plane;
d。 Position degree of die.
5。 The precision of forming process ensures that in the process of forming structure, the coordinate processing method is adopted whether it is processed by computer gong, EDM, WEDM or ordinary milling machine. The guarantee of the accuracy mainly depends on the accuracy of the machine tool and the accuracy of the operator’s calibration table and score. It is considered that the concept of die precision should also run through the whole process of mold design and manufacturing, just as the guiding principle and guiding ideology of establishing enterprise product quality assurance and management system.
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