Increasing the injection pressure can reduce the shrinkage of the product. This is because the pressure is increased, the injection speed is increased, and the filling process is accelerated. On the one hand, the melt temperature is increased by the shear heat of the plastic melt, and the flow resistance is reduced; on the other hand, the melt temperature can also be obtained.

In the state of high pressure and low flow resistance, it enters the pressure-preserving feeding stage earlier. Especially for thin-walled plastic parts and small gate plastic parts, due to the fast cooling rate, the filling process should be shortened as much as possible. The higher holding pressure and cavity pressure make the products in the cavity dense and shrinkage, especially the pressure in the pressure-holding stage has a greater influence on the shrinkage rate of the product. This can be explained by the fact that the molten resin is compressed under the molding pressure. The higher the pressure, the greater the amount of compression that occurs, and the greater the elastic recovery after the pressure is released, so that Plastic mould manufacturers the size of the plastic part is closer to the size of the cavity, so the amount of shrinkage The smaller. However, even for the same product, the pressure of the resin in the cavity is not uniform in each part; the injection pressure is different in the portion https://www.nbtianke.com where the injection pressure is difficult to act and the portion where it is easy to act.

In addition, the pressure of each cavity of the multi-cavity mold should be designed uniformly, otherwise the shrinkage rate of the products of each cavity will be inconsistent. Reasonable tolerances of various plastic parts and corresponding mold manufacturing tolerances can be reasonably determined, which not only brings convenience to mold manufacturing, but also reduces waste and improves economic efficiency.

Whether it is possible to process high-precision precision plastic products depends to a large high speed injection molding https://www.nbtianke.com/product/high-speed-thin-wall-injection-molding/ extent on the rational design of precision injection molds. Nowadays, industrialized countries in the world have used the injection molding machine for remote operation or unmanned operation, and automated production has been realized.. Precision injection molds (plastic precision injection molding molds for precision injection molds) are one of the main tools in the production of injection molded products.

In China, we have achieved remarkable results in the development of self-controlled injection molding machines, but further efforts are needed to achieve high automation of injection molding products. High-precision, high-efficiency equipment, advanced injection molds, and reasonable injection molding processes are indispensable factors in today’s plastic molding processes, and all three are indispensable.

The working principle of the molding machine is to adjust the molding conditions according to the production monitoring signal in time to ensure the quality of the finished plastic products.The impact of injection molds on the plastics industry.The impact of injection molds on the plastics industry Molds are indispensable in the production and processing of today’s plastics industrial products, of which injection molds have an important position in modern industry.

The mold structure is simple and easy to manufacture. The main advantage of such a mold is that it can save materials, can remove the cost of processing after the molded product, and can be produced at a high speed, but the disadvantage is that the structure is complicated, and the mold manufacturing and design cost is high. (3) No flow channel mold No flow mold type, no waste such as road and flow path. The template and the flow strip stripper are composed of three plates, so they are called three-plate molds.

The cost of processing is Thin-wall injection molding manufacturers https://www.nbtianke.com/product/high-speed-thin-wall-injection-molding/ wasted.. Different gate types, different ejection modes and different die structures can form various types of molds, such as the general classification. The fixed side of this type of mold is fixed to the fixed plate of the injection molding machine to become the injection portion of the material. The basic production and design principles of all injection molding molds are Take this as a starting point. (2) Three-plate mold The difference between the three-plate mold and the two-plate mold is that, in addition to the two-type template, a flow strip stripping plate is inserted, and the main part of the mold is fixed-side template and movable side type. The movable side is fixed to the movable plate of the molding machine, and the injection molding is completed.Explain the structure of the injection molding die
Explain the structure of the injection molding die. When the mold is opened, the molded product is attached to the movable side, and the molded product is ejected by the mold opening operation of the molding machine or the hydraulic pressing device.

This type of mold is complicated in construction, production and design, and it needs to be produced by using a larger stroke molding machine when molding. Therefore, the cost is high, but the advantage is that it can be automatically produced, and the molded product can be removed. The structure of the injection molding die is variable. The mold structure is simply divided into three basic types: (1) The two-plate mold type mold is the standard structure of the injection molding mold of Huangjiang

In fact, in our life, as long as you open your eyes, you can see plastic products. Because there are many plastic products in our lives, and these plastic products are almost all made through plastic molds. I believe that after the Xiaobian explanation, it is not difficult to precision mold manufacturing https://www.nbtianke.com understand that plastic molds are generally used in life. Plastic molds are actually mainly used to produce plastic products. Because the plastic products commonly used in our lives are more common, if these daily necessities are needed in a single production, it will waste a lot of manpower and material resources, but if you use the practical method of plastic molds, Save a lot of trouble.

Because after making a mold, you can use this mold to produce thousands of identical plastic products. Most of the plastic products need to be made through plastic molds. So where can this kind of mold be used in life? Let Xiaobian take everyone to a brief look today.Wide application of plastic molds and injection molds

Speaking of plastic molds, many people may find this word very strange, but if you talk about plastic products, many people may find it easier to understand. We can also say that its existence promotes the development of industry around the world, which is true for any country’s industry. Therefore, Xiaobian can very surely tell everyone that the application of plastic molds in our life is very extensive. A key tool, so plastic molds are indeed a very practical thing in industrial production.

The nozzle can inject the split plastic melt into each cavity through the hot nozzle, which fully reduces the injection pressure and reduces the internal stress of the product and improves the product quality. Due to the different needs of different households and different characteristics of different plastics, there are many choices of nozzle specifications and models, and can also be customized and processed according to customer’s special requirements. Composition of the heat flow nozzle:

The nozzle structure is for fitting on the outlet of the fluid supply source and generates a fluid jet distributed from the fluid supply source during use, the nozzle structure having a body, the body comprising: An actuator device for operatively flowing fluid from the fluid supply source through the nozzle structure during operation; (2) an inlet through which fluid from the fluid supply source passes during use The inlet enters the nozzle structure; (3) one or more outlet holes through which fluid is discharged from the nozzle structure during use; (4) an internal fluid flow passage that causes the inlet and the inlet One or more holes are connected; wherein the fluid flow channel further comprises an internal chamber having two or more inlet holes and an outlet port through which fluid can exit the chamber; and each inlet The channels and holes are of sufficient diameter to ensure that they will not be partially or completely blocked and that they are larger than 0.1 mm in diameterSecond, the classification of hot runner nozzles: can provide multiple series of gate structure forms to meet the needs of different molds or plastic parts; the heat distribution of the melt is evenly balanced; the interchangeability of the parts is good; Nozzles of different gate configurations, such as open nozzles, needle valve nozzles, automatic nozzles, and high performance nozzles. (1) Point nozzle tip: Open nozzle mainly includes point gate tip and open nozzle; point nozzle is the most widely used open nozzle, which can be injection molded according to gate size and different size. Materials are available in different types of point gate tips. small household appliances OEM factory https://www.nbtianke.com/product/ (2) Open nozzle: Open nozzle mainly includes point gate tip and open nozzle; open nozzle can provide larger gate size, achieve good pressure holding effect, and reduce injection molding products. Internal stress makes the product less deformed. (3)

Needle valve type nozzle: The valve needle is controlled by pneumatic or hydraulic pressure, which can effectively shorten the molding cycle and increase the injection speed; no gate mark can effectively improve the surface quality, widely used in the processing of fine surfaces; good for injection molding materials. Adaptability, can process difficult molding materials and achieve the best injection molding effect.

The above is the plastic mold manufacturer to share with you the four conditions that must be met in order to achieve the best plastic mold temperature control. The temperature control unit must be able to maintain the average plastic mold required within tight limits. !.In order to achieve optimal plastic mold temperature control, these four conditions must be met. Wall temperature, no matter what production conditions. Channels, surfaces are available and must be provided for temperature control adaptation, especially for molding corners and cores (angular deformation). If you want to learn more related knowledge, you can continue to pay attention to my official website. If the cooling channel is too small, the high pressure drop is the result, because it is too large, resulting in a low diameter Flow velocity, turbulence in the cooling channel is the primary reference for the effectiveness of the cooling system. Second, the size of the heating cooling channel heating cooling channel considers the size connection, the pressure that must be given needs to be used to transport the coolant in the mold. Therefore, it is divided into several parallel circuits and placed on the assembly so that the temperature difference does not become too large, and the size and quality requirements necessary. I hope you will understand after reading.
Plastic mold, an abbreviation for a combined plastic mold for compression molding, extrusion molding, injection molding, blow molding and low foam molding. Fourth, the coolant and temperature control unit coolant should have good performance. In order to achieve optimal plastic mold temperature control, these four conditions must be met: First, the position of the heating and cooling channels is heated and the number and position of the cooling channels should be such that all mold parts are uniformly temperature controlled to ensure a sufficiently large heating and cooling. Water has proven to be small household appliances OEM factory https://www.nbtianke.com/product/ the ideal coolant for thermoplastic processing. Third, the temperature difference between the temperature difference inlet and the outlet temperature of the coolant should be as small as possible

Insufficient filling often occurs in the production of injection molds. Compressed air burns, high internal stresses inside the product, surface flow lines and fusion lines. In addition to these phenomena, in addition to the first adjustment of the injection molding process, it is also necessary to consider whether the mold gate is reasonable. When Plastic Injection Molded Automotive Parts both the injection molding process https://www.nbtianke.com/product/car-parts/ and the gate are eliminated, the exhaust of the mold is the main problem. The main means to solve this problem is to open the exhaust vent. Then I will introduce the exhaust vents for everyone. First, the venting groove design of thermosetting plastics: The exhaust of thermosetting materials is more important than thermoplastic materials. First, the shunt in front of the gate should be vented. The width of the venting groove should be equal to the width of the runner and the height is 0.12 mm. The periphery of the cavity should be exhausted. Each exhaust groove should be separated by 25mm, the width is 6.5mm, and the height is 0.075~0.16mm, depending on the material flow. Softer materials should take lower values. The ejector rod should be enlarged as much as possible, and in most cases, 3 to 4 planes with a height of 0.05 mm should be ground on the cylindrical surface of the ejector rod, and the direction of the wear scar should be along the length of the ejector rod. Grinding is carried out using a finer grinding wheel.

The end face of the ejector rod should be ground to a chamfer of 0.12 mm so that if a flash edge is formed, it will adhere to the part. Second, the role and design of the exhaust trough: 1, the role of the exhaust trough: the role of the exhaust trough mainly two points. One is to exclude the air in the cavity when injecting the molten material; the other is to exclude various gases generated during the heating process. The thinner the wall product, the farther away from the gate, the opening of the venting groove is particularly important. In addition, attention should be paid to the opening of the venting groove for small parts or precision parts, because it can avoid the surface burn of the product and the insufficient injection volume, and can also eliminate various defects of the product and reduce mold contamination. 2, exhaust method: There are many ways to exhaust the cavity, but each method must ensure that the exhaust groove is designed to prevent the material from overflowing into the groove while it is exhausting; secondly, it should prevent blockage. Therefore, from the inner surface of the cavity to the outer edge of the cavity, the length of the groove of 6~12mm or more is about 0.25-0.4mm. In addition, too many exhaust vents are harmful. This is because if the clamping pressure applied to the portion of the cavity part that is not opened is large, it is easy to cause cold flow or cracking of the cavity material, which is very dangerous.

In addition to venting the cavity on the parting surface, it is also possible to achieve the purpose of venting by providing a venting groove at the end of the flow of the casting system and leaving a gap around the ejector pin. 3, design method: based on years of experience in injection mold design and product trial mode; this article briefly introduces the design of several exhaust slots, as shown in Figure 1. For product molds with complex geometries, the opening of the venting groove; it is best to determine it after several trials. The biggest shortcoming of the overall structural form of the mold structure design is poor exhaust. There are several kinds of exhausting methods for the whole cavity cavity core: 1 using the groove or insert of the cavity to be the human part; 2 using the side insert joint; 3 partially forming the spiral shape 2 and installing the groove in the longitudinal position The slat heart opening process hole; 5 when the exhaust is extremely difficult, the use of the mosaic structure, etc., if some die dead angle is not easy to open the venting groove, firstly, the mold should be appropriately changed without affecting the appearance and precision of the product. Processing.