Briefly describe the characteristics and advantages of various composite injection molding technologies

The production and manufacturing of multiple injection molding products presents a new prospect for plastic production and processing, that is, to form different raw materials or colors in one forming. Production and manufacturing can be carried out in a process flow without other assembly lines or post-processing processes outside the equipment. Multi part injection molding is an automatic whole process, with the coordination ability of high width ratio, which is very suitable for batch production.

Z-shaped parts can have a variety of functions and characteristics. Using this whole process, colored parts with high aspect ratio, impact resistance, temperature resistance or acid resistance can be produced.

The definition of multi part injection molding includes several separate whole processes. The same point in the whole process is that two or a large number of injection molding equipment are used to introduce different raw materials into the mold, and then a series of processes are used to produce post Z goods. After Z, the part can be applied immediately without solving afterwards.

According to the number of rubber inlets, it can be divided into two groups:

The system software with single rubber inlet includes sandwich type and replacement injection molding process.

The system software of multiple rubber inlets can carry out basic zoning according to the whole process of core pulling and transmission. The whole transmission process includes the migration of the mechanical arm system software between two standardized devices, and the migration is carried out in special multiple devices according to the rotation of the mechanical arm system software and the mold. Mold rotation includes the rotation of movable half mold according to the rotating equipment, the rotation of mold internals and the rotation around the vertical axis (GRAMTM whole process).

Advantages:

Advantages of multi part injection molding: In multi part injection molding, each part of the formed part is completely separated. All bicomponents are surface layer, which reflects the appearance and function of parts.

For example, computer keyboard keys, labeled power switches, or doorknobs with soft areas to enhance comfort. In addition to the advantage of being able to produce injection molded parts with a variety of colors or raw materials in a whole process without using other assembly lines or solving problems afterwards, the continuous improvement of forming technology can also produce steady economic benefits.

Injection molded parts are resistant to external hazards (such as mechanical equipment effect, thermoelectric effect or organic chemical effect), which is completed according to appropriate raw material composition and high adhesive compressive strength. The adhesion of two-component fusion surface can be completed according to organic chemical bonding or mechanical equipment connection. If organic chemical miscible raw materials are used, molecular structure fusion can be completed according to the whole process of melting or electric welding.

Two component injection molding:

The automatic two-component injection molding mold has two stations. After the pre injection of the formed parts, the production of the parts goes through another injection molding link. Prefabricated component parts are manufactured in the first female die. Then the mold is opened, and all the theme movable half molds rotate 180 ° to rotate the prefabricated component female mold to the Z final injection position. Then, according to the addition of the second raw material, the prefabricated component parts are manufactured as post Z parts. The die and female die can rotate in the same direction, and can also be rotated in different ways. After the part after Z is out of the mold, the hollow die can carry out the next prefabricated component.

In order to separate the part ejection from the processing process, an ejection station is integrated into the two-component forming. Then, the mold rotates clockwise. There is an opening on the side of the third station, from which the force point of the mechanical arm system software can extend into the closed mold, and the parts and the rubber inlet can be removed from the mold and placed on the conveyor belt for further solution.

Three kinds of above two-component injection molding:

The above three two-component forming processes can be completed in a variety of ways. Two feasible methods are described in detail below.

Two station mold:

You can use the three component mold setting method similar to the above to set the two-step mold. In the first process flow, three or a large number of components (more than five) are injected to produce prefabricated parts. Then, all half of the mold rotates 180 and moves to the second part. At this time, other raw materials are used for injection molding to guarantee the prefabricated components, and the post Z parts are produced.

The other way is that in the relatively equipped mold, the part base can be composed of more than five surface elements composed of other raw materials/colors in one production and manufacturing process. Therefore, the inserted part in the mold can rotate in the middle of three stations according to the rotating sample and the rotating device of the electric driver.

Four station mold:

For example, double-layer plastic parts can be manufactured with four station mold. When using recycled particles and insulating layer, this type of method is convenient for completion. The Z inner layer is manufactured in the first station. Then, the die rotates 90 °; Go to the next stop. At this time, the injection molding of the second component is used to guarantee the first component. Then, the half mold turns to the third station again, and the Z finally turns to the fourth station to carry out the production and manufacturing of the Z final link.

At this time, the surface layer with maintenance function or the surface of the formed part is molded on the part. After the refrigeration process, the rear Z double-layer part is ejected from the female die. In the continuous circulation system, each time the mold is opened, a post Z forming part is produced.

Replacement injection molding, replacement injection molding introduces two different colors of the same plastic two-component replacement into the same die.

Before entering the mold, both colors are placed in a unique mixing nozzle. Two colors and two components are mixed to produce the actual color effect. The two colors can be mixed and equipped with arrival stations. In the whole process of replacement injection molding, the two injection molding equipment are connected together with unique replacement injection molding equipment (in which there is a mixing nozzle).

Sandwich injection molding:

The whole process of sandwich injection molding introduces a core raw material into the outer surface. The whole process is carried out in two or three processes in one die.

Z First, introduce the raw materials of the travel arrangement surface into a part of the interior space of the die. Subsequently, the core two-component was injected into its internal management center according to the first raw material. Finally, the first two-component is used to carry out the sealing at the rubber inlet. In this way, core raw materials can be avoided on the surface layer. In addition, the second component in the rubber inlet system software can be eliminated so that the first component can be injected next time.

Assembly line injection molding:

The components that must be assembled after injection molding can be independently formed on the two-component equipment and then assembled on the assembly line in the mold by using the rotary mold. The sealing example of the assembly line in the cable hose shows how to complete the whole process of the assembly line in the mold. Two independent components Z are formed separately at the respective die station.

Then, after the mold is opened, the first component is transmitted to the second station according to the rotation of the inserted part, and then placed on the upper side of the second component core. The assembly line of 2 parts is completed according to the shaft core stamping die. Therefore, the process after the event can be omitted, and the application of complicated automation technology solutions is not required.

Summary:

Multi part injection molding will become more and more critical in the future. In particular, the role of hard and soft components in production and manufacturing, which is a technical development trend, has only recently developed. The application of assembly line injection molding can complete the effective integration of various action elements in the near future and gradually replace the connection processing technology.