One minute understanding of the eight steps of plastic injection molding
Injection molding, also known as injection molding, is an injection molding method. The advantages of the injection molding method are fast production speed, high efficiency, automatic operation, a wide variety of patterns, shapes from simple to complex, and sizes from large to small. Moreover, the product size is accurate, the product is easy to be updated, and it can form parts with complex shapes. Injection molding is applicable to mass production, products with complex shapes and other molding processing fields.
What are the steps of plastic injection molding?
Heating and pre plasticizing
Driven by the drive system, the screw conveys and compacts the materials from the hopper forward. Under the shearing and friction of the heater outside the barrel, the screw and the barrel, the materials gradually melt. A certain amount of molten plastic has accumulated at the head of the barrel. Under the pressure of the melt, the screw slowly retreats. The retreating distance depends on the amount required for one injection of the metering device. When the predetermined injection amount is reached, the screw stops rotating and retreating.
Mold closing and locking
The mold locking mechanism pushes the template and the mold moving part installed on the moving template to close and lock with the mold moving part on the moving template, so as to ensure that sufficient clamping force can be provided to lock the mold during molding.
Injection device moves forward
When the mold closing is completed, the entire injection base is pushed forward to make the nozzle of the injection machine fully fit with the main runner of the mold.
Injection and pressure maintaining
After the mold locking and nozzle fully fit the mold, the injection pressure cylinder enters the high-pressure oil to push the screw forward relative to the barrel, injecting the melt accumulated at the head of the barrel into the mold cavity with sufficient pressure. The plastic volume shrinks due to the temperature drop. In order to ensure the compactness, dimensional accuracy and mechanical properties of the plastic parts, it is necessary to maintain a certain pressure on the melt in the mold cavity to supplement materials.
Pressure relief
When the melt at the mold gate freezes, the pressure can be relieved.
Injection device retreats
Generally speaking, after the pressure relief is completed, the screw can rotate and retreat to complete the next feeding and pre plasticizing process. (In general, the action that the injection base withdraws from the main gate of the mold has been canceled for existing injection molding. This action is performed for materials with serious salivation, such as PA).
Mold opening
After the plastic parts in the mold cavity are cooled and shaped, the clamping mechanism opens the mold and pushes out the plastic parts in the mold.
Stamping parts on automobile body are generally divided into covering parts, beam frame parts and general stamping parts. The stamping part that can clearly represent the image characteristics of the automobile is the automobile panel. Therefore, the automobile die referred to by GATT can be said to be "automobile panel stamping die". It is called … Processing technology and characteristics…
Classification of automobile tire molds: Processing technology of automobile tire mould (taking mould as an example): Mold Classification and Processing Technology of Vulcanized Automobile Tire Vulcanized automobile tires are essential components of modern vehicles. They are made using a complex manufacturing process that involves several stages, including mold classification and processing technology. In this article, … Mold classification and processing…
What conditions should the cooling water design of plastic mold meet? 1、 The edge distance between water conveyance and product material level shall not be less than 10MM generally, and shall be designed between 10MM and 12MM as far as possible; Alloy die is generally 25MM; 2、 The design of water transport margin and insert … What conditions should the…
It is very important to develop mold standard parts and implement specialized production of molds In recent years, the plastic mold industry has developed rapidly in China, which is followed by increasingly fierce market competition. After joining the WTO, foreign mold manufacturers enter the domestic market. To stand out in the fierce competition, it is … develop mold standard parts…
Plastic mold manufacturers focus on developing molds with high technology content In recent years, although the growth rate of mould export is greater than that of import, the absolute amount of increase is still that of import is greater than that of export, which leads to the increase of mould foreign trade deficit year by … Plastic mold manufacturers focus…
The four elements of mould include quality, delivery period, price and service In the four elements of mould quality, delivery cycle, price and service, more and more users put the delivery cycle first. It has become a trend to require mold companies to deliver products as soon as possible. Enterprises try their best to improve … The four elements of…
Rely on technical personnel to improve the design and processing level of mold enterprises With the improvement of the design and processing level of mold enterprises, mold manufacturing is mainly relying on technology instead of bench work in the past. This is not only the change of means of production, but also the change of … Rely on technical personnel…
Improper heat treatment process of mould is easy to cause failure of plastic mould The failure of plastic mould is mainly caused by improper heat treatment process of mould, such as improper selection of heat treatment process parameters such as heating temperature, holding time and cooling speed. During the processing of plastic mold, cracks or … Improper heat treatment process…
Causes of Shrinkage Marks at Thicker Positions of Plastic Mold Parts Shrinkage is more severe at thicker locations of plastic mold parts, such as rib or protrusion, than at adjacent locations, because the cooling rate of thicker areas is much slower than that of surrounding areas. Different cooling rates lead to the formation of concavity … Causes of Shrinkage Marks…
Which kind of mould factory is better for cooperation? Foreign capital or private At present, there are many foreign, Taiwan, Hong Kong and private mold factories to choose from in the Pearl River Delta and Yangtze River Delta regions of China. The advantages and disadvantages of mold factories with various qualifications are as follows. (1) … Which kind of mould…
How large is it better to cooperate with mold suppliers? Large scale, medium scale or small scale? The choice in this regard depends on the situation. If we only consider the scale of the factory, many people will think that the larger the scale is, the better, because the scale is large and the facilities … How large is it…
How to select mold manufacturers with complete supporting equipment It is suggested that you should pay attention to one basic common sense when purchasing, that is, you must choose a manufacturer with complete supporting equipment, that is, a mold factory with "five essentials", that is, you must have supporting precision CNC machining center, slow wire … How to select mold…
How can the company effectively reduce the cost of mold procurement? For cost control, first of all, it is necessary to understand the expected order quantity of new products from the personnel of the Marketing Department? Is it huge?In the development and review stage of new products, if the estimated order quantity does not reach … How can the company…
Pits to be avoided when purchasing personnel select appropriate mold suppliers (1) Never blindly believe in low purchase prices. There are always some traps hidden behind the low price, which are unknown to us. We can either pass the shoddy goods off as shoddy ones or cut corners. We should know that any mold factory … Pits to be avoided…
How to choose a reasonable plastic mold cooperation factory? Reasonable selection of cooperative manufacturers is often the first step to successMany customers are blind when they choose plastic mold manufacturers. Now many small factories on the Internet cheat customers after packaging. They often offer much lower prices than their peers to tempt customers to place … How to choose a…
The engineer designs the product considering the rationality of plastic mold making Product engineers need to consider the rationality of mold making when designing productsMany customers only pay attention to the design and R&D speed of products at the initial stage of new product development, ignoring the communication with plastic mold manufacturers, resulting in unnecessary … The engineer designs the…
The selection criteria for plastic mold manufacturers are quality, cycle, service and priceAlthough price is important, quality, cycle and service are indispensable When it comes to manufacturing plastic products, choosing the right plastic mold manufacturer is crucial. With so many options available, it can be challenging to determine which one to select. There are several … The selection criteria for…
How to Select Wear Resistant Die Steel for Precision Plastic Injection Molding Injection mold is a tool for producing plastic products; It is also a tool to endow plastic products with complete structure and precise size. Injection molding is a processing method used in batch production of some parts with complex shapes. In the process … How to Select Wear…
What are the common engineering plastics for automobile parts molds? With the development of automobile lightweight and the increase of automobile production, the amount of plastic used in automobiles is increasing. In recent years, the market demand for energy conservation and consumption reduction has been exerting pressure on the lightweight design of automobiles. In order … What are the common…
How to maintain the injection mould for producing plastic productsInjection mold is a tool for producing plastic products; It is also a tool to endow plastic products with complete structure and precise size. Injection molding is a processing method used in the mass production of some parts with complex shapes. Specifically, it refers to the … How to maintain the…
