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Injection molds must consider these three processing technologies

In the processing of injection molds, this complete professional technology is an indispensable project. It involves transforming plastics into products that retain the original system performance. The important production process design conditions of injection molding are the temperature, pressure and the corresponding different effects that affect the plasticizing flow and cooling. Here, our general analysis can be divided into three aspects: one, temperature and control, two pressure management control, and three molding cycle. There are a total of 3 points for temperature control to indicate the working temperature of the barrel, nozzle, and mold as follows: 1. Barrel temperature: According to different conditions, the temperature of the selected barrel is also different. The temperature to be controlled in the injection mold process is the cylinder temperature, which mainly affects the plasticization and flow of the plastic. Each plastic has a different flow temperature. The same plastic has different flow temperature and decomposition temperature due to different sources or brands. This is due to the difference in average molecular weight and molecular weight distribution. Plastics are also different in the plasticization process of different types of injection machines. , So the choice of barrel temperature is different. 2. Nozzle temperature: Normally, the nozzle temperature is slightly lower than the ambient temperature of the barrel in this case. This is to prevent the occurrence of drooling when the melt is in the straight-through nozzle. The temperature of the nozzle should not be too low, otherwise we will block the nozzle due to the early solidification of the melt, or the performance of the product will be affected by the early solidification of the material injected into the cavity, and proper temperature control can guarantee the product’s performance. Performance and other characteristics. 3. Mold temperature: Generally speaking, mold temperature has a great influence on the internal performance and appearance quality of the product, and it can be said to be a very important factor. The temperature of the mold depends on the crystallinity of the plastic, the size and structure of the product, the performance requirements, the melt temperature, the injection speed, the injection pressure and the molding cycle.

2021-07-28

What are the characteristics of mold processing?

Mold processing refers to the processing of forming and blanking tools, in addition to shearing dies and die-cutting dies. What are the characteristics of these molds? I will explain it to you today. 1. Generally, there are molds composed of concave film, convex mold and film frame, and the control accuracy is higher. Some may also be composed of multiple pieces. Therefore, the combination of upper and lower molds, the combination of inserts and cavities, and the assembly of modules require high machining precision. 2. Small batches of molds are not mass produced during production, but only one pair is produced in most cases. 3. The use of molds has a long life. When a pair of molds exceeds its life, the mold should be replaced in time, so the mold production process has a certain degree of repeatability. 4. Various processes such as milling, boring, drilling, reaming and tapping are also used in regular mold processing. 5. The main material of the mold is high-quality alloy steel. Some molds with long service life are often made of Crl2, CrWMn and other ledeburite steels. The production and processing of this material is very strict, so the processing technology cannot be ignored. Deformation is also an aspect that needs to be taken seriously in processing. To sum up, when choosing an airport, it is necessary to meet the processing conditions as much as possible, such as strong functionality, high precision of the machine tool, good rigidity, thermal stability and anti-type functions. 6. Some surface shapes are composed of multiple curved surfaces, such as automobile covering parts, airplanes, parts, toys, household appliances, etc. Therefore, the mold cavity is easy to be complicated, and some need to be processed by mathematical calculations. 7. Some molds have neither patterns nor data in the production process, and can only be imitated by the real object, which requires high imitation accuracy and no deformation. The introduction of mold processing characteristics is here today.

2021-07-28

Some basic knowledge of mold processing

The utility model relates to a combined plastic mold for compression molding, extrusion molding, injection molding, blow molding and low-foaming molding, which mainly includes a concave mold composite substrate, a concave mold component and a concave mold combined card board Consists of a concave mold with a variable cavity. With the rapid development of the plastics industry and the continuous improvement of the strength of general plastics and engineering plastics, the application range of plastic products is also expanding, and the use of plastic products is also increasing. Plastic molds are tools for producing plastic products. It consists of several groups of components. There is a molding cavity in this combination. During the injection molding process, the mold is clamped on the injection molding machine, the molten plastic is injected into the mold cavity, cooled in the cavity, and the upper and lower molds are separated. The product is ejected from the cavity through the ejection system, and then the mold is closed for the next time Injection molding. The entire injection molding process is cyclic. The general plastic mold is composed of a movable mold and a fixed mold. The movable mold is installed on the movable template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. In injection molding, the movable mold and the fixed mold are closed to form a gating system and a cavity. When the mold is opened, the movable mold is separated from the fixed mold, and the plastic product is taken out. The basic structure of the mold is the same, but the structure of the mold may be different due to the type and performance of the plastic, the shape and structure of the plastic, and the type of injection molding machine. The mold is mainly composed of a pouring system, a temperature control system, a molded part and a structural part. Casting systems and molded parts are parts that are in direct contact with plastics, and they change with changes in plastics and products. They are the most complex and variable parts in plastic molds, and they require finishing and precision. The above is some basic content of mold processing, I hope to bring you some help.

2021-07-28

Color difference of injection mold

Injection mold processing technology has become more and more popular in the plastic product production industry. After decades of development, the entire process has matured. Chromatic aberration factors of injection molding products: 1. Raw material factors: including toner replacement, plastic material brand change, and styling agent replacement. 2. Different types of raw materials are selected: For example, PP material and ABS material or PC material require the same color, but there is a slight color difference due to the different development of the main varieties of materials, but a limited protection range is allowed. 3. Environmental factors: through years of experience, injection mold manufacturers generally have unclean drums and dust in the drying hopper, which will cause mold oil pollution. 4. Equipment process reasons: the temperature, pressure, and melting time in the injection molding process will also cause color difference problems, and other process factors such as the mixing of different batches of materials and beer on different machines will also affect. 5. Toner factors: some toners are not subject to temperature, and the products are easily changed by changes in the temperature environment. The above are the factors related to the chromatic aberration problem of injection mold processing. I believe that everyone can avoid the problem well according to these reasons. In the future, we will have more ideas about injection molds. Interested friends can pay more attention to us.

2021-07-28

Some basic knowledge of mold processing

The utility model relates to a combined plastic mold for compression molding, extrusion molding, injection molding, blow molding and low-foaming molding, which mainly includes a concave mold composite substrate, a concave mold component and a concave mold combined card board Consists of a concave mold with a variable cavity. With the rapid development of the plastics industry and the continuous improvement of the strength of general plastics and engineering plastics, the application range of plastic products is also expanding, and the use of plastic products is also increasing. Plastic molds are tools for producing plastic products. It consists of several groups of components. There is a molding cavity in this combination. During the injection molding process, the mold is clamped on the injection molding machine, the molten plastic is injected into the mold cavity, cooled in the cavity, and the upper and lower molds are separated. The product is ejected from the cavity through the ejection system, and then the mold is closed for the next time Injection molding. The entire injection molding process is cyclic. The general plastic mold is composed of a movable mold and a fixed mold. The movable mold is installed on the movable template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. In injection molding, the movable mold and the fixed mold are closed to form a gating system and a cavity. When the mold is opened, the movable mold is separated from the fixed mold, and the plastic product is taken out. The basic structure of the mold is the same, but the structure of the mold may be different due to the type and performance of the plastic, the shape and structure of the plastic, and the type of injection molding machine. The mold is mainly composed of a pouring system, a temperature control system, a molded part and a structural part. Casting systems and molded parts are parts that are in direct contact with plastics, and they change with changes in plastics and products. They are the most complex and variable parts in plastic molds, and they require finishing and precision. The above is some basic content of mold processing, I hope to bring you some help.

2021-07-28

How to solve the problem of deformation in injection molds

Deformation of products of injection molding processing enterprises is a relatively common and difficult problem. Through analysis, we want to solve our social problems. From the perspective of machine adjustment, the feasibility is actually not great. The problem of deformation must be solved from the mold structure design management. The reasons for the specific deformation and the teaching methods for solving are as follows : The main findings are as follows: 1. When the injection molding conditions cause deformation, reduce the stress by reducing the injection pressure, increasing the mold temperature, making the mold temperature uniform, increasing the resin temperature or using annealing methods. 2. When the bad behavior of demolding causes stress to deform, you can continuously increase the number or area of the push rods, and correct the demolding slope. 3. When the cooling is uneven or the cooling time is insufficient, adjust the cooling method to extend the cooling time. Setting the cooling circuit as close to the deformation as possible can also improve the deformation problem. 4. Due to the deformation caused by molding shrinkage, it is necessary to modify the mold design. Among them, the most important thing is to pay attention to making the product wall thickness consistent. Sometimes, if necessary, the mold must adjust the opposite direction by measuring the deformation of the part. The above are the four major countermeasures to solve product distortion, have you learned? I hope to help you, and there will be more consultations in the future, and interested friends can pay more attention.

2021-07-28

Have you understood the characteristics of mold processing?

The mold processing industry is developing rapidly. Now many things are made by mold processing. This article will take you to understand its characteristics. 1. The precision of the mold processing technology can be high. The mold is generally composed of a concave mold, a convex mold and a mold base system, and some may also be a multi-piece design module. Therefore, the combination of the upper and lower molds, the combination of inserts and cavities, and the assembly of module functions require high processing method accuracy. The dimensional calculation accuracy of precision machinery molds often reaches the μm level. 2. The shape is complex. Some products, such as car panels, aircraft parts, toys, household appliances, etc., have surface shapes composed of various curved surfaces. Therefore, the surface of the mold cavity is very complicated. Some surfaces must be processed mathematically. 3. The production of batches of small molds is not mass production. In many cases, only one pair is produced. 4. Multiple processes. In the mold processing, you always need to use many different processes such as milling, boring, drilling, reaming and tapping. 5. Long service life of repeated production molds. 6. Copy processing. Sometimes there is no pattern or data in mold production. Copy processing should be performed according to the object. This requires high simulation accuracy and no distortion. 7. The mold material has excellent performance and high hardness. The main material of the mold is made of high-quality alloy steel, especially the long-life mold. This kind of steel has strict requirements from blank forging, processing to heat treatment. Therefore, the processing technology of the preparation cannot be ignored, and the heat treatment deformation is also a problem that needs to be solved seriously in the processing. According to the analysis of the above-mentioned many development characteristics, the selection of machine tools should not meet the processing technology requirements of enterprises as much as possible. For example, the function of the CNC control system should be strong, the precision of the machine tool should be high, the rigidity should be good, the thermal stability should be good, and it has the function of profiling.

2021-07-28

Reminders on injection molded containers

Injection molding is to inject molten plastic into a lower temperature closed mold through a nozzle under high pressure. Thermoplastics and thermosetting plastics can be injection molded and can be used to make various box-type packaging containers, such as various turnover boxes and small boxes. For box packaging containers, the following aspects should be considered in the structural design: 1. The wall thickness of the container 1. Thickness: The wall thickness of the container is mainly determined by its use, plastic product type, structure, etc. For different thermoplastic engineering plastics, it is generally considered that the time should not be less than 0.6mm, and 2~4mm is often selected; for other thermoset plastics, due to their poor fluidity management, the thickness should be larger, small parts are 1.6~2.5 ram, and large parts It is 3.2～8mm, not more than 10mm. 2. Uniformity: The uniformity of the wall thickness has a great influence on the quality of the container. If the thickness difference is too large, the shrinkage will be uneven, causing defects such as deformation and cracks. Therefore, the equal-thickness structure should be used as much as possible in the structural design. 3. Smooth transition: In some containers, certain parts must have different thicknesses due to structural requirements, such as the turning point of the container. This should be used for smooth transition to avoid sudden changes in cross-section. Second, improve stiffness 1. Add stiffeners: stiffeners can enhance the strength and rigidity of the container. The basic requirements for stiffeners are that the number of stiffeners should be large, the wall thickness should be thin, the height should be short, there should be sufficient slope, the bottom of the stiffener should be arc-shaped transition, and the direction of the stiffener should be consistent with the direction of material flow to improve The toughness of plastic. 2. Improve the shape: the box-shaped container is mostly a rectangular thin-walled piece, which is prone to deformation. Various methods should be adopted to enhance the four side walls of the container slightly outward to improve the rigidity of the system; Reinforcement; edge reinforcement at the edge of the container. 3. Reasonable support: The bottom area of the box container is large, but it is not suitable to use the entire bottom of the container as a support. Since the bottom of the box body is slightly bent, the bracket should be changed to a wire bracket or a point bracket. The convex side bracket (ie, the wire bracket) raises the tripod (ie, the point bracket), and the height is generally 0.3-0.5 mm. 4. Corner: The corner is the intersection of two or three faces. Regardless of the shape of the container, rounded corners must be used at the intersection of all surfaces, which can greatly improve the rigidity of the container, improve the filling of the plastic, disperse stress, and reduce deformation. Third, the draft angle In order to facilitate the demolding of the molded part, it is necessary to fully consider the proper demolding angle when designing the pressure vessel. If the demolding slope is too small, demolding is difficult, and the surface of the container is damaged; if it is too large, the calculation accuracy of the main dimensions will be affected. The demolding angle varies with the shape of the plastic part, plastic type, mold structure, surface roughness, injection molding method, etc.

2021-07-28

Do you know the necessity of injection mold test?

Most of the defects of injection molded products are caused during the plasticizing and injection molding stages of injection molded parts, but sometimes they are also related to unreasonable design. Influencing factors include: the type of injection port, the number, location and size of the mold cavity, the design of the cold/hot runner system and the structure of the product itself. Therefore, in order to avoid product defects caused by mold design, we need to analyze injection molds during production. After obtaining the results of the injection mold test, the operator usually needs to analyze and evaluate the specific actual situation of the mold, so as not to increase the unnecessary cost and time of the enterprise in the process of information modification. In most cases, in order to be able to make up for the shortcomings in the mold structure design, the operator may make incorrect settings without knowing it, because the parameter setting range required by the society to produce qualified products in the market is also very small, once the parameters There is no deviation in the setting problem, which may affect the quality management of the final product to be far beyond the allowable error range. The purpose of injection mold testing is to find better process parameters and mold design. Not just to get a good sample. This is very important to ensure stable and uninterrupted mass production even if materials, machine settings or environmental factors change.

2021-07-28

What are the main uses of injection mold processing

The injection mold is a compact tool. It has an irregular shape and bears the expansion force of the blank. Therefore, there are very high requirements for structural strength, rigidity, hardness, roughness and machining accuracy. The increase of injection molds is one of the most important symbols of the degree of mechanical manufacturing.

2021-07-28