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What aspects should be paid attention to when choosing injection mold processing
What aspects ...
As a kind of equipment for the production of plastic products, the injection mold includes the overall design and precise size of the plastic products in the early stage, so that the plastic products can be put into the injection gun with a complete structure for finished product processing. Injection mold processing is a complex tool for mass production of plastic products. What aspects should users pay attention to when choosing this type of equipment?Injection mold processing.jpeg1. Responsible mold injection manufacturerThe prerequisite for how to choose quality-guaranteed injection mold processing is to clarify whether the manufacturing company behind it is a smart technology company that is engaged in the manufacture of corresponding precision parts, and mold design and manufacturing, injection molding processing, assembly and other links. . It not only conducts one-by-one audits in all processing links, but also strives to provide high-quality plastic products and system parts for all walks of life. Only a responsible manufacturer can meet users' high-quality requirements for products.2. Quality of plastic productsSatisfying the customer's injection mold processing must have a wealth of industrial processing and manufacturing experience and capabilities, using automated production equipment and ultra-high-precision manufacturing machines to create various styles required by users. To ensure that users can provide high-quality products, and help provide multi-faceted solutions from design to assembly for precision molds and plastic parts.3. Reasonable price positioningBecause it is the corresponding work of the assembly line with the nature of manufacturing, but the injection molding equipment used is combined with information technology and intelligent technology, and with a strong production process, this type of injection molding tool still maintains a price range Stable and not rising, to ensure that users can enjoy such cost-effective injection mold services.While understanding the attention aspects of injection mold processing, users are also pre-selecting the type of injection mold they need. Provide users with a wide range of clarification of the corresponding items in the processing process, find an injection mold with a suitable manufacturing cycle and good quality, and find an injection mold manufacturer with sufficient scientific and technological content.
2021-08-09
Several classifications of hot runner systems
Several class...
     The hot runner system is mainly composed of four parts: main temperature controller, sprue sleeve, manifold and hot nozzle. According to the type of glue feeding, it can be divided into two types: single-point type and multi-point type. The single-point type has only one nozzle and one glue inlet point. For some round products with higher requirements, sometimes one nozzle has multiple glue inlet points. Multi-point type has multiple nozzles and multiple injection points. The single-point type generally does not require a manifold. Some molds are limited by the shape of the product, and the position of the glue port needs to be far away from the center of the mold. Sometimes it is necessary to increase the size of the mold or the tonnage of the injection molding machine. This will directly lead to an increase in the overall cost. For this reason, the single nozzle hot runner needs to add a manifold, and the mold does not need to be eccentric. The multi-point type must use a manifold. The hot nozzles of the hot runner are commonly used large nozzle type, point gate type, pneumatic needle valve type and so on.             Figure 1-2a is a commonly used multi-point open hot runner system. It is usually used on a large mold with one cavity and one cavity or a mold with multiple cavity. When the product is too large, multiple gates and multiple gates are needed. When the distance between them is too far, this form must be used. Another feature of the hot runner is that it can not only feed the glue directly on the surface of the product, but also turn it into a cold runner to feed glue, which is usually said to be a hot runner to a cold runner. However, this kind of open hot nozzle is mostly used in molds that convert hot runners to cold runners. When a mold has multiple cavities, it is sometimes necessary to use this form in order to reduce the length of the cold runner. This kind of hot nozzle is of the large nozzle type, and the front end of the hot nozzle can be processed twice, and can be processed into a curved surface, an inclined surface, or a runner, etc., as required. Figure 1-2b shows a commonly used single-point open hot runner system. It has no splitter plate and only a hot nozzle. It is mostly used in a mold with multiple cavities and short runners from hot runner to cold runner. Sometimes it can also be used. Directly inject glue on the surface of some products that are not demanding. The disadvantage of this open hot nozzle is that it will leave a piece of waste. For example, direct glue on the surface of the product requires a secondary trimming of the glue port. The hot nozzle is used in many steps. Figure 1-2c is also a commonly used single-point open hot runner, which is basically used on the mold for direct product surface injection. Compared with the previous two, its advantage is that there is no waste, no need to trim the secondary gate, and the production efficiency is higher. This kind of hot nozzle can not only be used with a single nozzle. It can also be used on the mold of the multi-point hot runner system. It is an ideal choice for large products that need to be glued directly on the surface. The disadvantage is that a circle and a dot are left on the surface of the product. Therefore, it cannot be used on product molds that require higher appearance.      In addition to the above-mentioned common structures, the hot runner system also has many other structure types, because different hot runner manufacturers have different standards. You only need to fundamentally understand the principle and method of use of the hot runner. As for its internal structure and theoretical knowledge, there is no need to spend too much time to study it. I will not list them all here.
2021-05-17
Mold hot runner system
Mold hot runn...
      The hot runner system is a very versatile plastic molding and pouring system. The heating device and the electronic temperature control system are mainly used to prevent the molten plastic in the pouring system from solidifying, so that the plastic is filled into the mold cavity smoothly and orderly. In the absence of injection pressure. The molten plastic will not flow automatically, nor will it cause wire drawing or overflow with the demolding of the plastic product. Therefore, the hot runner mold is also called the no-flow mold or the less-runner mold.      For a long time, the injection molding system of plastic molds has always used cold runners to inject molten plastic into the mold cavity. With the advancement of science and the continuous development of productivity, people have begun to realize many disadvantages of traditional injection molds, including hot runner waste. The production and use of the = longer molding cycle and low production efficiency, which directly leads to an increase in cost.        With the emergence of 3D software, the structure of plastic products is becoming more and more complex, and the requirements are getting higher and higher. Therefore, traditional molds have been unable to meet the needs of modern products in terms of molding processes, and people have to consider other technical processes. The American Lncoe company invented the hot runner injection molding mold technology, which set off a revolution in the mold industry. Especially in recent years, with the development of microelectronics technology and the invention of electronic temperature control boxes, the hot runner system has developed to a very mature stage.Comparison of the advantages of hot runner and cold runnerA cold runner1. During the injection molding filling process, due to the continuous loss of heat at the front end of the material flow, the surface of the material flow is solidified, and the injection pressure loss is large, which directly affects the service life of the injection molding machine.2. During the injection and filling process, due to the continuous loss of heat at the front end of the material flow, the surface of the material flow is solidified, resulting in an even temperature step of the plastic injected into the mold. It may directly lead to a series of problems such as printing, welding marks, deformation, warpage, depression, and dissatisfaction of the plastic products after molding, which makes the plastic products unable to meet the requirements.3. Due to the production of cold runners, factories need to design special waste secondary processing equipment, resulting in waste of manpower, material resources, and materials.4. The mold has a long cooling time and a long filling time, resulting in low production efficiency.Two hot runner1. The heated temperature of the hot runner is almost the same as the temperature of the barrel and nozzle of the injection molding machine, which avoids the phenomenon of condensation of molten plastic on the inner surface of the runner, and the injection pressure loss is small.2. After the plastic is molded, the quality is high, because the temperature, pressure and density of the plastic after being injected into the cavity are uniform, the internal stress of the plastic part after molding is small, the deformation is also small, and the size is stable.3. No waste, save materials, save resources and costs.4. The mold cools quickly, fills quickly, the molding cycle is short, and the production efficiency is high.Disadvantages of hot runner modeling1. Because the heating runner system has a heating mechanism and a manifold mechanism, it takes up a lot of space. Therefore, the overall height of the mold needs to be increased, which directly leads to an increase in mold cost.2. The heat loss is serious and difficult to control3. Severe thermal expansion will occur after heating4. The hot runner system is expensive, leading to increased mold manufacturing costs.Features of hot runner modeling1. The melting temperature range of plastics is relatively wide, at low temperatures. Good fluidity and good thermal stability at high temperature.2. Sensitive to pressure, no flow without pressure, but can flow after applying pressure.3. Good thermal conductivity, fast heating and fast cooling.Several issues that need attention in hot runner modeling1. Due to severe thermal expansion after heating, there must be enough space between the hot runner system and the mold for expansion2. Large-area contact between the hot runner system and the mold should be avoided as much as possible.3. Because of the serious heat loss, a heat insulation pad should be added between the mold and the injection molding machine to reduce heat loss. The heat insulation board must have insulating materials. Commonly used are bakelite, various plastic sheets and glass fibers.
2021-05-17
Classification of mold structure
Classificatio...
      A complete mold usually has two parts, one is the forming part. It is the part related to the shape and size of the plastic product. The second is the mold base part, also called the mold base, which is used to install the molding part. In traditional mold manufacturing, the mold base is processed by the mold manufacturer itself, which is not only time-consuming, but also the processing accuracy cannot be guaranteed. In modern mold manufacturing, most mold bases are not allowed to be made by themselves, and they are all made to order in professional mold processing plants. Nowadays, mold base manufacturers in various countries have established their own standards. The most famous ones are HASCO from Germany, DME from the United States, FUTABA from Japan and LKB from China. They are also the four largest mold base manufacturers in the world, and their various mold bases are available for users to choose from. When designing the mold, just call the mold base directly.There are two major types of plastic injection molding.Two-format molds, two-format molds are not suitable for molds with front sliding modules and molds with dispensing = gate. In addition to these two structures, other structures can be used.Three-format molds, three-format molds are also called fine nozzle molds. According to the type of mold, they can be divided into three types: fine nozzle, simplified fine nozzle and fake three-platen. 1. There are 4 small nozzle mold bases fixed in the B plate of the rear mold side, and the simplified small nozzle does not have a guide post.2. There are limit washers on the 4 poles of the fine nozzle mold base, while the simplified fine nozzle does not have limit washers3. The thin nozzle mold base can realize the push plate mold structure, while the simplified thin nozzle cannot be designed with the push plate structure.        Small nozzle mold bases are usually used in larger batches of plastic products. On molds with higher mold requirements. Small nozzle mold bases should also be considered for medium and large molds with an outer shape of more than 500mm, because the small nozzle mold base has 4 more guide posts than the simplified one.The guiding effect and strength are better, and the mold life is longer. The simplified fine nozzle mold base is usually used for small and medium-sized molds below 50mm. It is also unsuitable to use when the batch of plastic products is large, because it has 4 guide posts less than the fine nozzle mold base and wears for a long time.The guiding effect and strength are not very good. The false three-plate mold base is designed by the standard for the mold of the front slider mechanism. There is no discharge plate and it is not suitable for the mold of the dispensing port.A complete plastic injection mold consists of 6 major systems.1. The pouring system and the pouring system share a main runner, a runner, a gate, and a cold slug hole2. Molding mechanism The molding mechanism is the part that is in direct contact with the plastic product, including the front and rear mold cores, inserts, sliders, inclined tops and other mechanisms3. Ejection mechanism The ejection mechanism includes thimble, ejector block, cylinder, thimble fixing plate, thimble backing plate, reset lever, etc.4. Guide mechanism The guide mechanism includes guide posts, guide sleeves, top plate reset rods, top plate guide posts, top plate guide sleeves, etc.5. Cooling system The cooling system is mainly a circulating water circuit, with oil cooling, water cooling, and cold air. Some molds need to be heated, and the cooling water can be used for heating6. Scheduling system The exhaust system mainly includes exhaust grooves, exhaust needles, exhaust inserts, exhaust valves, etc.
2021-05-17
Knowledge of injection molding process
Knowledge of ...
        Generally, the manufacture of plastic products requires a plastic molding step in advance, and then processes them into semi-finished plastics or plastic parts according to the needs of the product. Injection molding is one of the earliest processing methods of plastic parts. Everyone knows that Product injection molding must be done together with injection molding machines and injection molds. This article will introduce the process of product injection molding and the conditions required for injection molding.      Injection molding is to heat and melt the material into the mold, and then cool and solidify the molding. The specific operation method is through the hopper of the injection molding machine. Send some granular, powdered plastic into the heated hopper. When these plastic particles become molten. The screw of the machine will put pressure on it, and then inject it into the low-temperature mold through the nozzle. At this time, the material will be cooled to form various shapes of the mold cavity. Finally, the mold is opened and the molded plastic body is taken out, and the entire injection molding process is completed.       And injection molding is a commonly used method for plastic product molding and processing, and it can be applied to all thermal plastics and some thermal solid plastics. Most of the products we see in our lives are made by injection molding, at the same time. Product injection molding is also called injection molding. Because it is also a method of injection and mold molding. The process cycle of injection molding is very short, generally within a few seconds or minutes. The weight of the injection molded product ranges from a few grams to tens of kilograms. It has the characteristics of strong adaptability, high production efficiency, and fast molding speed. It can be applied to the production of plastic products with complex shapes, various colors, precise dimensions, large output, or non-metallic parts.Four requirements for injection molding.1. Use advanced injection molding machine for production.2. Use auxiliary equipment to complete, such as: dryer, cooler, crusher, etc.3. Use suitable plastic materials4. There are experienced technicians to operate the machine
2021-05-12
Mold knowledge
Mold knowledg...
       There is a saying that 'mold is the mother of industry', and its importance is gradually recognized by people. Products in any industry cannot be separated from molds to produce products. With the continuous development of society. The technology of mold design and mold manufacturing has also made great progress.      Currently. Mold processing technology is constantly updated, and different types of processing materials have also been well applied. The standardization and specialization of the production of mold parts have made us adapt to the development of molds faster and more accurately in mold design.           A mold is to produce a model of a product, and then make the product according to the produced model. The mold is available in our lives all the time. Most of the products in our daily life, such as mobile phones, mice, watches, speakers , Computers, hair dryers and other products are produced through molds. Therefore, the products that come into contact with life now are all dealing with molds. As long as it is a large-scale large-scale production, it is inseparable from the mold.      The manufacturing of molds generally has to go through several processes such as material forging, cutting, heat treatment, etc., in order to ensure the quality of mold manufacturing and reduce production costs. When selecting materials, generally choose forgeability, machinability, hardenability, and grinding properties. It also has a small oxidation and decarburization sensitivity that may lead to the tendency of mold deformation and cracking.
2021-05-12
What is a mold
What is a mol...
Plastic injection mold is a tool for producing plastic products with certain shape and size requirements. With the rapid development of 3D software, the shape of plastic products is becoming more and more complex, and the requirements for molds are getting higher and higher, especially molds. structure        The rationality and processing accuracy of plastic products have a direct impact on the aspiration and production efficiency of plastic products. Therefore, all countries in the world are paying great attention to the design and manufacturing technology of molds. They are actively exploring new technologies and developing advanced equipment. SatisfyThe development needs of modern molds.Reasonable mold design is mainly reflected in:1. The appearance of plastic products is beautiful. Able to meet and exceed the design requirements of plastic products.2. The size of the product is stable, accurate, and the amount of deformation is small.3. The mold is safe and reliable in the process of reuse, stable movement, long service life and easy maintenance.4. During the injection molding process of the mold, the molding cycle is short, the production efficiency is high, and the rejection rate is low.5. The mold structure is simple, the processing is convenient, and the production cycle is sectioned.In summary, a high-quality mold has a close relationship with mold design, so it is very important to improve the comprehensive level of mold designers.
2021-05-11