When there is a large plane on the part that can be used as the positioning reference, the plane is always processed first, and then the hole is positioned by the plane to ensure the position accuracy between the hole and the plane. In this way, the positioning is relatively stable, the clamping is convenient, and the deflection caused by the drilling on the rough surface can be avoided.
c) The principle of “first primary and then secondary” is to process the main surface (datum plane and working surface with high position accuracy requirements) before processing the secondary surface (such as keyway, screw hole, fastening hole, etc.). The secondary surface is generally after the main surface reaches a certain precision and before the final finishing.
d) According to the principle of “first rough and then fine”, for parts with high precision requirements, it is carried out in order from coarse to fine, so as to gradually improve the machining accuracy. High speed computer gongs processing this point for poor rigidity parts, especially can not be ignored. In order to solve such problems, the characteristics of titanium alloy materials, machining characteristics, tool data selection, milling processing characteristics, coolant and other aspects are analyzed to improve the one-time acceptance rate of titanium alloy parts, so as to control the product quality of the parts. In order to better control the product quality, it is necessary to control the cutting parameters of non-standard equipment parts and understand and master the processing characteristics of materials.
Mechanical processing technology is to change the shape, size, relative position and nature of the production object on the basis of the process. CNC processing makes it a finished product or semi-finished product. It is a detailed description of each process. For example, as mentioned above, rough machining may include blank manufacturing, grinding, etc., and finishing may be divided into turning, fitter, milling machine, etc., and each step is just like this There must be detailed data, such as how much roughness and tolerance should be achieved.
The classification of machining is as follows:
Design datum: the datum used to determine the position of other points, lines and planes on the part drawing, which is called design datum.
Process datum: the datum used in the process of machining and assembling parts, which is called process datum. According to different uses, the process datum of die and mould can be divided into assembly datum, measuring datum and locating datum.
(1) Assembly datum: the datum used to determine the position of parts in parts or products during assembly, which is called assembly datum.
(2) Measurement datum: the datum used to check the size and position of machined surface, which is called measuring datum.
(3) Positioning datum: the datum used for workpiece positioning during machining, which is called positioning datum. For the surface (or line, point) as positioning reference, only the rough surface can be selected in the first working procedure. This positioning surface is called rough datum. The machined surface can be used as the positioning datum in the following processes, and the positioning surface is called the precise datum.
The correct use and maintenance of equipment parts processing mold is also a major factor to improve the quality of mold. Mechanical parts processing, such as: large CNC processing mold device debugging mode should be appropriate, in the case of hot runner, the power wiring should be correct, the cooling water circuit should meet the design requirements, and the parameters of injection molding machine, die-casting machine and press machine should be consistent with the design requirements. In order to improve the surface wear resistance of the die parts and improve the quality of the die, the surface strengthening of the main parts of the die is carried out in the precision parts processing. For the surface strengthening, different strengthening methods should be selected according to the mold for different purposes.
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