THE DEFINITION AND DEVELOPMENT OF THE INJECTION MOULD

General definition of mould: in industrial production, metal or nonmetallic materials are made into parts or products of the desired shape by pressure with various presses and special tools mounted on the presses. The special tools are collectively called molds.

The injection process explains that the mold is a tool for producing plastic products. It consists of several parts, and the combination has a molding cavity. When injection molding, the mold is clamped on the injection molding machine, and the molten plastic is injected into the mold cavity. The mold is cooled and shaped in the cavity, then the upper and lower mold is separated, and the product is ejected from the cavity through the ejection system. Finally, the mold is closed for the next injection molding, and the whole injection process is carried out in a circular way.

The tools and products we use in our daily production and life range from the machine base, the fuselage shell, the small head screw, the button, and the housing of all kinds of household appliances. The shape of the mould determines the shape of these products, and the quality and precision of the mold determine the quality of these products. Mold is divided into casting die, forging die, die-casting die, stamping die and other non-plastic mold, as well as plastic mold.

In recent years, with the rapid development of plastic industry and the continuous improvement of strength and precision of general and engineering plastics, the application of plastic products is also expanding, such as: household appliances, instruments, construction equipment, automobile industry, etc. In many fields, such as daily hardware, the proportion of plastic products is increasing rapidly. A reasonably designed plastic part can often replace many traditional metal parts. The trend of plastic conversion of industrial products and daily products is on the rise.

About JasonMould Industrial Company Limited

Jasonmould is a manufacturer of plastic molds- injection mold, die casting moulds, plastic blow molding, rotational molding, medical plastic injection molding, two shot plastic injection molding, insert molding, overmolding, metal injection molding, micro injection molding, powder injection molding, ceramic injection molding, liquid injection molding, husky injection molding, household mold, casting mold, die mold tool, custom molds, china moulds, rapid prototyping tooling, plastic prototyping tooling, punch press tooling, die and tooling for mobile/ cell phone parts, automotive parts, vacuum cleaners, rechargeable tools, telephones, copiers, computers, multimedia speakers, and many other electronic products and household appliances. And also a plastic product manufacturer- plastic parts, plastic water tank, plastic balls, plastic containers, plastic buckle, plastic anchor, plastic hanger, plastic spoon, plastic pipe fitting, plastic tumble, plastic tableware, plastic cups, plastic bottles, plastic tray, plastic cosmetic container, plastic case, plastic food container, plastic chairs, plastic caps, plastic cap closure, plastic tubes, plastic water pipes, plastic knobs, plastic tubing, plastic utility boxes, plastic racks and so on.

Contact:
Person: James Yuan
Company: JasonMould Industrial Company Limited
Add:LongGangVillage,LongXiTown,BoLuoCounty,HuiZhouCity,GuangDong Province, China
Tel: 86-752-6682869
Email: james@jasonmolding.com

Site:https://www.jasonmolding.com/custom-injection-molding/

Article Original From:https://www.jasonmolding.com/the-definition-and-development-of-the-injection-mould/

WORKPIECE DESIGN FOR INJECTION MOLDING

The definition of injection molding is as a method of production objects which is done by the use of an injection molding machine with a heat-meltable plastic material. The shape of products is controlled by a confined chamber called a mold.

The injection molding process is one of the most versatile production methods in the plastic manufacturing industry. It is a major processing technique for converting thermoplastics or thermoset plastics into variety types of products for different end uses such as space shuttle to automotive, electronic to medical, sports to recreation, building and construction to machine, consumer products to medical apparatus and instruments.

Both product design and processing of the material are two important steps designing a plastic part. Several factors must be considered, the most important one is workpiece design. Other factors such as the economics, quality, appearance, and performance of the plastic workpiece also need to be considered. All of these factors must be considered in determining the feasibility if manufacturing a plastic workpiece.

Just as we have discussed that injection molding process involves feeding pellet material melting this pellet material from solid to molten plastic material, and forcing this melt through a barrel by a screw, conveying this molten material from the barrel through sprue, runner and gates into cavities of mold, and then cooling and forming this melt inside the mold which may also have such features as cores, inserts, and cavities.

There are several considerations in selecting the right material before object design: service temperature, chemical environment, workpiece economics and product specifications.

About JasonMould Industrial Company Limited

Jasonmould is a manufacturer of plastic molds- injection mold, die casting moulds, plastic blow molding, rotational molding, medical plastic injection molding, two shot plastic injection molding, insert molding, overmolding, metal injection molding, micro injection molding, powder injection molding, ceramic injection molding, liquid injection molding, husky injection molding, household mold, casting mold, die mold tool, custom molds, china moulds, rapid prototyping tooling, plastic prototyping tooling, punch press tooling, die and tooling for mobile/ cell phone parts, automotive parts, vacuum cleaners, rechargeable tools, telephones, copiers, computers, multimedia speakers, and many other electronic products and household appliances. And also a plastic product manufacturer- plastic parts, plastic water tank, plastic balls, plastic containers, plastic buckle, plastic anchor, plastic hanger, plastic spoon, plastic pipe fitting, plastic tumble, plastic tableware, plastic cups, plastic bottles, plastic tray, plastic cosmetic container, plastic case, plastic food container, plastic chairs, plastic caps, plastic cap closure, plastic tubes, plastic water pipes, plastic knobs, plastic tubing, plastic utility boxes, plastic racks and so on.

Contact:
Person: James Yuan
Company: JasonMould Industrial Company Limited
Add:  LongGang Village,LongXi Town,BoLuo County,HuiZhou City,GuangDong Province, China
Tel: 86-752-6682869
Email: james@jasonmolding.com

Site:https://www.jasonmolding.com/custom-injection-molding/

Article Original From:https://www.jasonmolding.com/workpiece-design-for-injection-molding/

THE PROTOCOL OF THE MOULD STRUCTURE

1.  Determine the number of cavities and their arrangement

Generally , small plastic parts with high precision requirements and medium and large plastic parts are preferred to adopt the structure of one mold and one cavity; for small plastic parts with low precision requirements (no matching precision requirements） simple shape and mass production, If the multi-cavity mould is adopted, it can provide unique superior conditions and greatly improve the production efficiency. The number of cavities can be determined according to the size of the model. The plastic part requires higher precision, which is a high precision plastic part, and then depends on the size of the plastic part. Die structure with one-mode and two-type. The arrangement of the cavity is as shown in the following figure.

2. Determination of mould structure

1. Multi-cavity single parting surface mould: small plastic parts with low appearance quality and general dimensional precision can be used.

2.Multi-cavity and multi-parting surface mould: small plastic parts with high appearance quality and general dimensional precision can be used in this structure. The plastic parts require high appearance quality and are small plastic parts with high dimensional precision. Therefore, the design of multi-cavity and single-parting surface can be adopted. From the plastic parts, it is easy to see the parting surface position of the mould, the setting of the breakout mechanism and the position of the gate. The parting surface is the vertical parting surface of the single parting surface.

The most commonly used gate forms are as follows:

The first is the side gate. This type of gate is familiar to the workers of the injection process and is more convenient to process in manufacture, but the disadvantage is that the runner flow is long and the heat loss is high, so it is easy to produce obvious marks of binder. If it is to be improved, The size of the sprue needs to be increased, but then the return of the sprue portion increases. Secondly, the inlet portion of the plastic needs to be deburred, which increases the working hours of deburring and damages the beauty of the surrounding area. The second is the point gate. When the plastic is injected, At the point gate, a part of the kinetic energy is converted into heat energy at the high speed injection cavity, so the heat loss of the plastic in rendezvous is less than that of the side gate, so the fusion is better at the rendezvous. The weld mark is not obvious. Its disadvantage is that the front of the plastic part will leave a mark of the burning mouth, which will affect the beauty of the plastic part, and the cavity must be moved in order to remove the gate material of the point gate. Because of the heavy weight of the cavity, Therefore, it is not convenient to move. The third is to integrate the advantages and disadvantages of the above two gate forms and adopt the shear gate. Because the side wall of the plastic part is far from the transverse gate, it is very difficult to realize the material feed directly on the side wall, so a new process support gate has been added. This kind of gate form has the following main advantages: first, there is no gate trace on the surface of the plastic part, and there is no obvious weld mark on the outside surface. So the appearance quality is better. Second, the position and quantity of the gate can be increased by the quality of the plastic parts. It is convenient to modify the mold by reducing or changing the position of the gate. Third, while the plastic parts are ejected, the gate is cut and cut off. According to the principle that plastic flow is consistent as far as possible, two shear gates are set up in order to cut off the sprue, and the technological auxiliary gate can be removed by hand.

 Contact:

Person: James Yuan
Company: JasonMould Industrial Company Limited
Add:  LongGang Village,LongXi Town,BoLuo County,HuiZhou City,GuangDong Province, China
Tel: 86-752-6682869
Email: james@jasonmolding.com

Site:https://www.jasonmolding.com

Article Original From:https://www.jasonmolding.com/the-protocol-of-the-mould-structure/

FOUR BASIC PARTS OF INJECTION MOLDING MACHINE

JasonMould Industrial Company Limited is a professional china plastic injection molding company for 3D Printing Rapid Prototyping Service, precision CNC milling service and custom CNC machining services, custom plastic injection molding or moulding company with mould and dies development and manufacturing.

Today we will tell you the knowledge about the basic parts of an injection molding machine.

The injection molding machine is consists of four basic parts: the injection unit, the clamping and ejecting unit, electric and hydraulic control unit. The purpose of injection unit is to melt the plastic and conveys or forces the material into the mold. The clamping unit is to keep the mold in a closed position and to resist the pressures during injecting to form the material into a specific shape, and then opens after cooling to eject the product from the mold. The electric and hydraulic control units is to offer the power to injector and control the movement of injecting such as injection or clamping unit, screw movement or ejector action.

Plasticizing and injection system

The injection unit of the machine is used to plasticize the material at a rate consistent with the time. An exact amount of material for each shot is metered by volume or weight. The shot amount of material includes the sprue and runner system, and should not exceed 80% and less 20% the rated shot capacity of the injector.

In injection molding, an open-ended cylinder, referred to as a barrel, acts as a guide for the pellets to move the pellets and melt from hopper to the mold where the workpiece is made. The auger or screw conveys material down through the barrel to the mold.

Clamping system

It is the function of the clamp system to close the mold with moving platen which takes half of the mold, and hold it closed under pressure during shot and cooling, and then opens the mold so that the wokpiece can be knockouted from the mold. There are four clamping systems in injection molding machine: hydraulic clamping system, mechanical clamping system, hydromechanical clamping system and electric clamping system.

Ejecting unit

The knockout unit causes an ejection platen in the mold to change its location relative to the rest of the mold. Attached to this knockout plate is ejector or other devices such as ejecting pins, ejecting plate or ejection sleeve, which directly push against and eject the workpiece molded as the mold opens completely.

On most injection machines there is an adjustable stationary ejector platen to which are attached the ejector pins, which go through the movable platen. As the mold closes or opens, the ejector bars contact and stop the ejection plate.

Electric and hydraulic control system

The electrical controls can be mounted in a separate enclosure or on the machine. The manual control panel is mounted on the machine for the  operator’s convenience. Hydraulic gauge and controls are mounted for convenience in piping. The location of the hydraulic components and the electric motors depend on the individual machine. Most oil reservoirs are in the base of the machine. Fully hydraulic clamps can have tanks above the clamping end.

About JasonMould Industrial Company Limited

Jasonmould is a manufacturer of plastic molds- injection mold, die casting moulds, plastic blow molding, rotational molding, medical plastic injection molding, two shot plastic injection molding, insert molding, overmolding, metal injection molding, micro injection molding, powder injection molding, ceramic injection molding, liquid injection molding, husky injection molding, household mold, casting mold, die mold tool, custom molds, china moulds, rapid prototyping tooling, plastic prototyping tooling, punch press tooling, die and tooling for mobile/ cell phone parts, automotive parts, vacuum cleaners, rechargeable tools, telephones, copiers, computers, multimedia speakers, and many other electronic products and household appliances. And also a plastic product manufacturer- plastic parts, plastic water tank, plastic balls, plastic containers, plastic buckle, plastic anchor, plastic hanger, plastic spoon, plastic pipe fitting, plastic tumble, plastic tableware, plastic cups, plastic bottles, plastic tray, plastic cosmetic container, plastic case, plastic food container, plastic chairs, plastic caps, plastic cap closure, plastic tubes, plastic water pipes, plastic knobs, plastic tubing, plastic utility boxes, plastic racks and so on.

Contact:
Person: James Yuan
Company: JasonMould Industrial Company Limited
Add:LongGangVillage,LongXiTown,BoLuoCounty,HuiZhouCity,GuangDong Province, China
Tel: 86-752-6682869
Email: james@jasonmolding.com

Site:https://www.jasonmolding.com/custom-injection-molding/

Article Original From:https://www.jasonmolding.com/four-basic-parts-of-injection-molding-machine/