Plastic molding 2021 is the main elements in the conveyor production of metal, plastic and other foundries. They determine the shape of the structure of the manufactured objects. The quality of the final product depends on the accuracy of setting the production of molds.
What is a Plastic molding 2021
Mold - a device for forming products of various designs from plastics, rubber, metals and other raw materials. It comes under the action of pressure generated on foundry machines. This is an element that repeats the contours of the finished object.
Plastic molding 2021 is common during injection molding of metal and plastic materials, as well as extrusion of polymers. Due to the rather high price, they are most often common for mass and serial production.
Mold design Plastic molding 2021
Molds consist of parts, which are conventionally divided into two groups. The first is represented by elements of technological purpose (working). They come into contact with recycled raw materials and are directly involved in giving the products the desired shape. These include punches, dies, support bearings, threaded marks.
What is plastic mold forming?
The second group of Plastic molding 2021 includes details of constructive significance. When forming products, they do not come into contact with the material. Designed to ensure the operation of the elements of technological purpose and are necessary for the mutual fixation. Moreover, it comes in a certain position of the parts of the form, closing and opening it.
Classification of types of Plastic molding 2021
According to the principle of operation of the mold are divided into:
Direct pressing is common to develop objects of simple shape. Due to the high cost of production they are not common for the manufacture of large batches of products. The design of the mold includes a matrix on which raw materials are laid out, and a punch for its consolidation.
Injection molding: The main advantage of Plastic molding 2021 is the ability to manufacture large batches of products of different configurations and complexity. Before pressing, they are in a closed state. Filling of raw materials in them carries out by means of the separate loading chamber (top or bottom)
Plastic molding 2021 classified according to several characteristics.
By nature of use: removable and stationary. Forms of the first type in the process of forming products do not fix on the plates of foundry machines a. Stationary molds are more common than removable ones.
Filling of material in them, and also extraction of the made products carries out without need of their removal from a plate of the automatic machine for molding. By the location of the connector plane: with vertical and horizontal planes. Forms with one vertical surface come with a connector for two parts.
Plastic molding 2021 three segments in two planes
In Plastic molding 2021 with a pair of horizontal surfaces, a connector forms in three segments in two planes, which are perpendicular to the vertical location of the force of the closing unit.
By the number of simultaneously formed objects: single- and multi-nested. In the first one product forms in one cycle of casting, in the second - several.
Method of removing the finished products
According to the method of removing the finished products: with ejection liners or rods, without a piston and with a pusher plate. From molds of the last type objects remove by means of compressed air or manually.
Ejection liners during molding partially or completely form a certain surface of the product, and during ejection - press on it until they fall out of the mold. Ejection rods when extracting the object press only on its individual sections.
Molds with cold-channel and hot-channel gutter system
The Plastic molding 2021 casting system is an element of the mold design from tanks and channels through which the liquid material is fed into the casting cavity. When using a cold duct system, the spout does not heat up. When cooling the formed casting, it cools and then falls out of it during or after opening the mold.
Products with a cold duct system are reliable, low cost, easy to use and maintain. But often these advantages remain back by the only drawback - the presence of unnecessary castings after each casting cycle.
Production cycle the material in the spouts
When using Plastic molding 2021 with a hot-channel system, the nozzle molten. The system heats up before the mold is put into operation, and during the entire production cycle the material in the spouts maintain in a viscous state.
Molds with hot-channel casting system comes by high cost and difficult design, require high energy consumption and intensive cooling, difficult to maintain (there are breakdowns of heaters, the cavity of the hot channel sometimes gets impurities, burns non-heat-resistant polymer, etc.).
Advantage is the absence of Plastic mold castings
The main advantage of Plastic molding 2021 is the absence of hardened castings (although sometimes they are present), which fall out with the finished product at each casting cycle. This allows not only to save raw materials and prevent the generation of industrial waste, but also to use foundry machines with less injection.
Mold - equipment for obtaining products of various configurations of metals, plastics, rubber and other materials under the action of pressure created on foundry machines.
Molds are common for injection molding of metals and polymeric materials, as well as for casting of smelted models and in the pressing of polymeric materials.
There are different types of molds:
- manual, semi-automatic and automatic;
- removable, semi-removable and stationary;
- with horizontal and vertical planes of the connector;
- with one or more connector planes.
The Plastic molding 2021 consists of a fixed part (matrix) and a moving part (punch), the forming cavities of which are inverse (opposite) prints of the outer surface of the workpiece. Several parts (multi-seat forms) are easy to form in one mold at the same time.
Molds of Plastic molding 2021
Supply of Plastic molding 2021material to the forming cavity carries out through the gutter system: the central, distributing and inlet gutters, and removal of the finished product - by means of the ejection system. Depending on the material and the requirements for the obtained workpiece in the form maintain a certain temperature balance.
Conclusion Plastic molding 2021
To regulate the temperature of the mold mainly use water, passing it through the cooling channels is a good practice. Another option may be - injection molding. In this case, the material feeds in a viscous-fluid state in a heated mold from the outside (from a gutter plate, for example). In this embodiment, the mold is easy to install fittings and embedded elements.