Injection molding - the most effective and widely used method of producing different products.Equipment for the casting of plastics - a wide range of devices, allowing to convert plastic and give it shape.
Features cast as a chemical process
in injection molding under pressure changes its viscous consistency to flow through the channels of the equipment.Were preparing some form, where and enters the molten mass, where it becomes hard.As well as equipment for plastic molding, the material may be different - the choice depends on what mode will be cast in any form.
Plastics casting occurs most frequently at a pressure of 80-140 MPa.If it is higher, it is possible to obtain products that would be of high strength.In addition, the ultra-high pressure makes it possible to accurately convey the dimensions of parts of the product.The pressure level is selected depending on the viscosity of the molten plastic, such as mold and the results will be achieved.
Types casting
equipment for injection molding is chosen zavisimoti matter what type of molding to be taken as the basis.There are several:
- Injection.With it, the product obtained with a minimum fine or a maximum thick walls, they give less shrinkage.The process itself is an injection of molten plastic into the mold, which closes completely.
- intrusion.This process is necessary to obtain articles with thick walls.At the heart of its operation - injection in the form of less material than required.The mold is filled with flowable composition under low pressure.Once it is filled, to a high pressure is applied a small amount of the material - that it finally forms the product compensates for its shrinkage.
Thermoplastic - basic equipment
equipment for molding plastic materials used are different, but as a rule, based on it are made piece goods.Advantages of high pressure die casting following:
- ability to use different types of plastic.
- efficient equipment, which provides an automated process.
- possibility of manufacturing parts with complex geometry that can not be done by other technologies.
- created by casting products can be reinforced to be hybrid or hollow, multi-colored and made of foam plastic.
- possibility of forming products of different weights - from a few grams to several kilograms.
Technology features
Using equipment for molding plastic, you can create different products.Thus the method is characterized by cycles, and the gist of it can be summarized as follows:
- first melted polymer that builds up in the cylinder of an injection molding machine for further submission to the form.
- melt kneader is moved into a form that is uniformly filled polymer composition.
- melt solidifies while the material cylinder is link up with the system of forms.
- Once the product has cured, the mold is opened, the product is removed from it.
equipment for plastic molding consists of the following elements:
- unit that prepares melt and feeds it into the mold (injection unit);
- locking block (and opening) form, which is a pressing device with the slider (clamping unit);
- drive unit: it provides all kinds of movement of mobile devices and tooling equipment;
- molding machine control device: it is meant to provide important parameters for the work, so casting is performed accurately.
Thermoplastic - a complex and relatively expensive device, which embodies advanced technical solutions.
Types
TPA TPA - is modern equipment for plastic molding, presented in different versions.Depending on the method of plasticizing they are single or twin screw, reciprocating piston or worm.Softening itself is combined or separate.Number kneaders also different.The drive to ROV can be electric or hydro.Furthermore, all molding machines are horizontal, vertical, angled - horizontal or vertical press section.
Corner equipment for injection molding, you can create major products, which are difficult to remove from the mold, and the vertical injection molding machine, on the contrary, good for the production of small products, including reinforced.
How does injection molding machine?
The principle of a simple injection molding machines.The raw materials to be processed is placed into hopper plasticizing unit, then it is output to the cylinder, wherein under the influence of the force of friction of the screw.As a result, the raw material is heated, plasticized, homogeneous mass is then fed into the space.As soon as the required amount of accumulated molten material is injected into the mold.The finished product is removed from it, and the cycle starts again.
equipment for plastic molding in silicone molds used in several modes:
- Manual when operations are started by pressing and end position adjustment movement of mobile nodes.
- semi-automatic.In this mode, it opens and closes the door mobile fences to make one work cycle.
- automatic (photocell).In this case, the cycles follow each other, but the command to perform the next cycle is transmitted photosensor in the time between when a finished product falls.
- automatic (time), when the cycle is carried out in an automatic mode, and the next cycle starts after the time delay between expire.
protection systems
Any equipment, including machines for plastic mold in the home, should work on the basis of safety rules.Modern injection molding machines are always equipped with systems that ensure the safety of personnel, actuating emergency.All protective devices are electronic, mechanical, safety, as well as a protective casing for the heating elements.
Using electronic devices can prevent the machine hydraulic system.In an emergency, you can use the "emergency stop" to turn off the oil pump.Mechanical systems a closed mold.With guard heating elements ensures safe operation of the equipment.
main brands
Modern manufacturers offer a wide range of injection molding machines, and equipment for molding plastic price very different and depends on the technical parameters, power and other parameters.The most popular today are considered to be Japanese, Chinese and South Korean brands.So, a new series of TPA was released by the Japanese company Nissei.Features of this product following:
- presence of 5-zone temperature control, including heating of the boot port.
- TPA can operate not only on the network.
interesting solution offered by the company Sumitomo: in her line includes 4 models, which have a direct drive screw on ball bearings.The model is highly accurate.On create a popular Toshiba brand equipment for plastic molding price is high, but it is justified by excellent quality systems.The distinctive features of products of this brand are:
- new control system, which controls the robot directly;
- software packages can be downloaded from the Internet;
- device can be set to sound restrictions.
Nadem by Meiki
Model Nadem by Meiki has direct control, it is supplemented by an injection compression system.This device is a fully electric, running at high speed.Equally perfect unit offers brand JSW Plastics Machinery: injection molding machines high speed allows a wide range of products of different thicknesses.Under the brand Toyo developed the largest equipment for injection molding.The cost of such equipment may be up to one million rubles, while the machine is stable to vibration, it has special injection mechanism that is associated with the balancing columns.
based on injection molding JONWAI produced various automotive parts.Initially, the company focuses on the fact that they use recycled polymer materials.And the products of this brand is widely popular car makers HYUNDAI, PEUGEOT, FORD, DACIA, FIAT.Molding machines are widely used in casting of plastic bumpers.Production of equipment for these processes - one of the activities JONWAI.
casting in silicone molds: what is the essence?
Vacuum casting into elastic form involves the production of plastics, rubber, plastic.This method is used for different purposes: to create prototypes and prototypes, small batches of products of varying difficulty, shape and size.Forms are created based on silicone pouring into formwork, which is the master model.Silicone polymerizes, whereupon it runs into the casting mold.
equipment for plastic molding in silicone molds allows to obtain products that perfectly reproduce the size and texture of the surface of the master model.Furthermore, casting under vacuum to prevent the appearance of porosity and surface defects thereon.Another important factor is that the silicone forms allow you to create products of any complexity and configuration, which can not be achieved using other technologies.
Rotational molding plastics
Production of equipment for rotational molding of plastics - not an easy process, which allows to receive large products.The peculiarity of their production is that in such a product no seams, and its walls are of equal thickness.Rotational molding involves the lack of pressure on the material, so the finished product do not have to internal stress, which affects the greater strength.This type of mold is composed of three phases of work:
- first poured into the mold the polymer material.
- form is sent to the chamber where it is heated.It is this stage is rotational molding.
- The last step is the cooling of rotary form.
