What are the requirements for mold processing of household appliances in injection mold factory

Because the processing time is too long, the impact of environmental temperature must also be considered. For example, when machining a large mold on an ordinary machine tool, a change of 10°C in the ambient temperature will result in a change of 6°C in the temperature inside the machine column, resulting in a change of 0.07 mm in the parallelism of the spindle Angle plate. Therefore, the design of the machine tool must consider the impact of the ambient temperature to avoid the impact of the ambient temperature on the accuracy of the machined parts.

The mold drawing should include two plans and a vertical cross-section, especially from the pillow horizontal height difference of the product cut out as many shapes as possible, and draw the pillow line of the product in the plan. The accuracy of the mold, that is, the avoidance of cards, guide posts, pins, etc., depends on the appearance quality of the product, the quality and life of the mold. According to the mold structure, various methods are selected, which mainly depend on the control of processing accuracy, and the internal model is mainly used for design. This method has been fully considered by the teacher, and the design is reasonable and easy to adjust.

(2) Preheat. Depending on the material and requirements of the die part, preheating processes such as annealing, normalizing or quenching and tempering are used to improve the structure, eliminate the structural defects of the forged blank, and improve the machining process. High carbon alloy cast steel can be properly preheated to remove the network of secondary cementation or chain carbides, spherical and refined carbides, and even make the carbides evenly distributed. This will help ensure the quality of quenching and tempering and improve the life of the mold.

The important parameter that determines the size of the product at constant molding temperature is the holding pressure, and the important variable that affects the dimensional tolerance of the product is the holding pressure and temperature. For example, after the filling is completed, the holding pressure is immediately reduced, and when the surface layer forms a certain thickness, the holding pressure is increased again, so that the large products with large walls are formed with low clamping force, and the flash can be removed.

Injection pressure control is usually divided into one injection pressure, two injection pressures (hold pressure), or three or more injection pressure control. The correct pressure transition time is very important to prevent excessive pressure on the mold and to prevent spillage or insufficient material. The specific volume of the molded product depends on the melt pressure and temperature at which the gate is closed during the holding step. Every time you switch from the holding pressure to the cooling phase of the product, if the pressure and temperature are the same, the same pressure force will not change.

Because the processing time is too long, the impact of the ambient temperature must also be considered. For example, when machining a large mold on an ordinary machine tool, a change of 10°C in the ambient temperature will result in a change of 6°C in the temperature inside the machine column, resulting in a change of 0.07 mm in the parallelism of the spindle Angle plate. Therefore, the design of the machine tool must consider the impact of the ambient temperature to avoid the impact of the ambient temperature on the accuracy of the machined parts.