Basic knowledge of mold design

Mold is the mother of industry” this sentence is very familiar to everyone. The importance of mold is more and more recognized, mold design and mold manufacturing technology has also made great progress.
Mold processing technology innovation, a variety of new mold materials widely used, mold parts standardization, specialization, etc. , have forced us to faster, more in line with the development of mold.
Speed-up requires that the design segment can be completed in about 3 days to the post segment: improve accuracy, in the design process to consider the processing methods of each part, as far as possible the use of high-precision, low-processing processing method costs.
The improvement in accuracy and speed is consistent. The improvement of speed must require the improvement of precision, and the improvement of precision will inevitably lead to the improvement of speed.
General definition of molds: In industrial production, metal or non-metallic materials are used to produce parts or items of the desired shape by pressure through the use of various presses and special tools mounted on presses. These special tools are collectively referred to as molds.
Injection molding process description: mold is the production of plastic products tools. It consists of several sets of parts with mold cavities. During the injection molding process, the mold is clamped to the injection machine, the molten plastic is injected into the mold cavity, the mold cavity is cooled and molded, and then the upper and lower molds are separated, and the product is ejulsed from the mold cavity through EJ. Check the system and finally close the mold. For the next injection, the entire injection molding process is circular.
Plastic molds consist of two parts: active molds and fixed molds. The active mold is mounted on the active template of the injection molding machine and the fixed mold is mounted on the fixed template of the injection molding machine. In injection molding, the moving mold and the fixed mold closed constitute the pouring system and cavity, when the mold is opened, the moving mold and fixed mold separately remove the plastic products.
Although the structure of the mold may vary depending on the type and performance of the plastic, the shape and structure of the plastic product, and the type of injector, the basic structure is uniform. The mold is mainly composed of pouring system, temperature control system, molding part and structural part. Pouring systems and molded parts come into direct contact with plastics and vary with plastics and products. It is the most complex and changing part of the mold, requiring the highest smoothness and precision.
In order to remove the product from the mold, the mold must be divided into yang mold and yin mold two parts. This interface is called parting faces. It has the function of mold division and exhaust, but because of the difference between mold precision and molding process, it is easy to produce burrs and tumors, which affect the appearance and precision of the product. When selecting parting faces, note:
The appearance of the product cannot be affected in a prominent position.
When the mold is opened, place the appliance on one side with the release body.
Located in mold processing and product post-processing is easy.
For products with high coaxial requirements, try to design cavities on the same side.
Avoid long cores and consider placing the core pumping mechanism in the open mode direction if it is necessary to place the core pumping mechanism on the yang side as much as possible.
Generally do not use the arc part, will affect the appearance of the product.
For plastics with good mobility and good overflow, a plug-in method should be used to prevent burrs.
For products with high height and low release volume, intermediate parting molds can be used on both sides of the parting cavity for easy release.