Corner cleaning, CNC machining is what this means. Use a small R-angle knife to clean the corners that a big R-angle knife can't clean.
According to the processing object and processing technology can be divided into:
① Mould for processing metal.
(2) Machining nonmetallic and powder metallurgy molds. Including plastic molds (such as two-color molds, compression molds and extrusion molds, etc.). ), rubber mold and powder metallurgy mold. According to the structural characteristics, the die can be divided into plane blanking die and cavity die with space. Generally, molds are single-piece and produced in small batches.
Extended data:
Because different molding dies are used in many fields, and the manufacturing technology of professional dies is changing and developing in recent years, in this part, the general design rules of vacuum suction molding dies are summarized.
The design of vacuum suction molding die includes batch size, molding equipment, precision conditions, geometric shape design, dimensional stability and surface quality.
1, the size of the batch experiment, the die output is small, and it can be made of wood or resin. However, if the experimental mold is used to obtain the data of shrinkage, dimensional stability, cycle time and so on, the single cavity mold should be used for the experiment, which can be used under production conditions. Moulds are generally made of gypsum, copper, aluminum or aluminum-steel alloy, and aluminum-resin is rarely used.
2, geometric design, design, often have to consider the dimensional stability and surface quality. For example, product design and dimensional stability need female die (female mold), but products with high surface gloss need male mold (male mold). In this way, plastic parts orderers will comprehensively consider these two points, so that products can be produced under the best conditions. Experience has proved that designs that do not meet the actual processing conditions often fail.
3. Dimensional stability. In the molding process, the dimensional stability of the surface of plastic parts in contact with the mold is better than that of parts leaving the mold. If the material thickness is required to be changed due to the need of material stiffness in the future, it may lead to the conversion of male die into female die. The dimensional tolerance of plastic parts should not be less than 10% of shrinkage.
4, plastic surface, in terms of the range of molding materials can cover, can meet the surface structure of plastic parts should be formed in contact with the mold. If possible, the smooth cleaning of plastic parts should not be in contact with the mold surface. Just like the bathtub and washbasin made in the female model.
5. When decorating, if the clamping edge of plastic parts is cut off with a mechanical cross saw, there should be at least 6 ~ 8 mm allowance in the height direction. Other dressing work, such as grinding, laser cutting or jet cutting, must also leave allowance. It should be noted that the cutting line gap of the knife-edge die is the smallest, and the distribution width of the blanking die is also very small when trimming.
6. Shrinkage and deformation. Plastic is easy to shrink (such as PE), and some plastic parts are easy to deform. No matter how to prevent it, plastic parts will be deformed during the cooling stage. In this case, it is necessary to change the shape of the molding die to adapt to the geometric deviation of plastic parts. For example, although the wall of a plastic part remains straight, its reference center has deviated from10 mm; The die holder can be raised to adjust the shrinkage of this deformation.
7. Shrinkage: The following shrinkage factors must be considered when manufacturing the plastic suction mold.
① Shrinkage rate of molded products. If the shrinkage rate of plastic cannot be clearly known, it must be obtained by sampling or testing with a mold of similar shape. Note: this method can only get the shrinkage, but not the deformation.
(2) Shrinkage caused by the adverse effects of intermediate media, such as ceramics and silicone rubber.
(3) Shrinkage rate of materials used in molds, such as shrinkage rate when casting aluminum.
References:
Baidu encyclopedia-mold