Pag-uswag sa integrated mold cooling system alang sa injection molding machine

0 Background

Injection molding is an extremely efficient plastic with very little material waste

Processing method. This processing method can process products with complex shape, accurate size or insert parts, high production efficiency and easy to realize automatic production. Injection molding main production equipment for injection molding machine, injection molding machine to complete an injection molding cycle can be roughly divided into the following steps: pagsira sa agup-op, pagpaplastikan, paghulma paghulma, pagpugong sa pressure, pagpabugnaw, pagbukas sa agup-op, pagpagawas, so reciprocating.

(1) The effect of mold cooling on the period of batching cycle.

The cooling time of the machine begins after the holding stage and ends when the die is opened. In the period of each batching cycle, the cooling time accounts for more than 1 / 2 of the whole cycle. The period of batching cycle in injection molding has a direct impact on production efficiency and equipment utilization. Busa, in order to improve efficiency, the first consideration should be the cooling time that accounts for a large proportion of the entire cycle. Studies have shown that good cooling system design and control can reduce about 20% of the cooling time.

(2) The impact of mold cooling on the quality of injection molding

Mold cooling not only affects the period of batching cycle, but also affects the quality of injection products. The evaluation of plastic products mainly has three aspects, the first is the appearance quality, including integrity, color, light and so on; The second is the accuracy of size and relative position; The third is the physical, chemical and electrical properties corresponding to the use. These three properties are directly related to the mold temperature during the molding process.

1. Surface quality. Too low mold temperature will make the product contour unclear and produce obvious fusion lines, resulting in improved surface roughness.
2. Dimensional accuracy. Keeping the mold temperature constant can reduce the fluctuation of molding shrinkage and improve the stability of dimensional accuracy of products.
3. Mechanical properties. If the temperature of the cooling system is set reasonably, the internal temperature field will be effectively improved, and the mechanical properties will be enhanced while reducing the stress in the plastic parts.

1 the present situation of mold cooling in injection molding machine shows that mold cooling plays a very important role in injection molding.

As the core equipment of molding production, injection molding machine should monitor the process of this important link in detail. Bisan pa, compared with other parameters of the molding process, the process monitoring of die cooling is often ignored. Sa pagkakaron, the production process parameters of injection molding machine (such as injection speed, pressure-holding ratio, cylinder temperature, ubp.) have accurate detection, timely feedback and process data storage, bisan pa niana, the process of mold cooling is still in the state of no monitoring or artificial monitoring.

Sa pagkakaron, most injection molding machine equipment mold cooling generally has two kinds of square.

(1) install the water separation block on the template of the injection molding machine, as shown in figure 1.

(2) install a mechanical flow regulator on the periphery of the injection molding machine, as shown in figure 2.

1.1 the water separation block installed on the template of the injection molding machine has the advantage that the pipeline arrangement is simple and clean, only the total inlet water and the main return pipe cooled by the mould are connected to the water separation block, and then the water distribution valve of each branch of the water diversion block is connected to the cooling water of the mould.

Connected. Niining paagiha, the branch road is short and the pressure loss is small. Bisan pa, the flow rate and temperature of water in this way can not be measured, and it is impossible to know whether the cooling water of the mould is connected normally and whether the water is clogged or not. And in the production process if the mold temperature machine failure or the valve on the water supply pipeline is misoperated and so on, the injection molding machine can not be sensed. Ingon kadugangan, with the production for a long time, the cooling pipeline in the mold will produce scale, water rust and so on, which not only affects the water flow rate, but also forms a kind of heat insulation layer, which affects the heat transfer efficiency. Niining panahona, it will cause defects in the products, and may have produced a lot of defective products, resulting in losses. 1.2 installation of mechanical flow regulators on the periphery of the injection molding machine

The flow regulator integrates float flow indication and pointer thermometer. The total influent and return water cooled by the die are connected to the flow regulator, and each branch of the flow regulator has a flow indication and a temperature meter. With the flow rate and temperature indication, the waterway error in the initial stage of die installation can be effectively avoided, and the waterway obstacle in the molding production process can be found in time.

Bisan pa, because the instrument of the flow regulator is mechanical, for the convenience of the equipment administrator to view, the flow regulator can only be installed in places that people can easily see around the machine. The more branches of the flow regulator, the greater the installation space required. Sa pagkatinuod, as the mold design becomes more and more fine, the cooling branches on the mold are increasing. The flow regulator needs a long branch pipe to connect the inlet and outlet of the branch on the periphery of the injection molding machine to the die. Especially on the mold on the side of the moving template, the length of the connection will be very long. Because the injection molding motorized formwork is moving, the branch pipe connected to the moving formwork must use a towing chain in order to ensure that the branch pipe can bend back and forth. If the number of branch water pipes is large, the corresponding towing chain should also be continuously increased. Busa, whether it is the installation of the water distributor itself or the layout of the branch pipeline, it has brought great trouble to the designers and installers.

The flow indication and thermometer of the flow distributor are mechanical and are stored in the reading error. Temperature and flow can only be detected when there is a significant change in temperature and flow. And can only rely on manual reading and recording, the frequency of manual reading is not easy to grasp.

Independent electronic temperature and flow detector for high quality plastic products, especially for automotive functional parts

The above two mold cooling configurations can no longer meet the requirements of quality control. In order to meet the quality requirements for high quality, manufacturers begin to equip the independent electronic temperature flow detector (fig. 3) beside the injection molding machine. The main inlet and outlet pipes of the cooling water of the mold are connected to the equipment first, and then the equipment is divided into various branches and connected to the mold. This independent electronic temperature and flow detector is generally composed of a controller, an operating screen and a temperature, flow and other sensors installed on each branch. This electronic temperature and flow detector can digitize the cooling water status of the mold and display it on the operating screen. Operation screen can set the cooling water state of the range value, beyond the set range value will immediately alarm, and the alarm state through the form of switch to inform the injection molding machine, so that the injection molding machine immediately stop action, in order to reduce the production of defective products. This device also has a data storage function, which can store historical cold data.

Sa kinatibuk-an, the independent electronic temperature and flow meter is an electronic upgrade of the mechanical water regulator. It solves the problems of inaccurate reading and manual inspection. But it also left some problems, such as the installation of the branch water pipe, the distance between the temperature measuring point and the mold. Dugang pa, the electronic temperature flow detector, as a device that can operate independently, must have its own operating screen and controller and protective sheet metal, so the price is higher and the initial investment is larger.

Injection molding machine integrated mold cooling control system In view of the problems left by the independent electronic temperature and flow meter, injection molding machine manufacturers have begun to design and promote injection molding machine integrated mold

Cooling control system. Shown in Figure 4.

From the perspective of installation space. Integrated mold cooling control for injection molding machines

In the design of injection molding machine, the installation space has been fully considered. The sensor and the sink block are installed in the nearest position from the mold. This kind of connection can be realized only by a short branch pipe. After the cooling water confluence of the mold, only the total inlet pipe and the total return pipe are arranged on the body of the injection molding machine, which greatly reduces the space required for the arrangement of the water pipes. The overall design of the injection molding machine can also be more compact. And some of the pipe insulation or anti-condensation water requirements, it is easier to achieve.

From a cost point of view. Injection molding machine is already a complete system, when the injection molding machine integrated mold cooling control system, the original injection molding machine hardware can be shared. Such as the host screen, controller, and protective metal plate. The cooling control system eliminates the need for a dedicated operating screen, controller and some protection, which can significantly reduce costs. Ingon kadugangan, after the operation is unified to the screen of the injection molding machine, the user’s operation will be more convenient.

The injection molding machine directly collects the sensor of the cooling system, which can get more direct and more accurate mold cooling data. After the injection molding machine has obtained the data, more intervention actions can be obtained. Such as the setting of multi-level early warning and alarm, setting up multi-level intervention action. With the deepening of integrated development, the mold cooling system can be linked with the mold hot runner heating system to achieve better control of the temperature in the mold.

With the development of Industry 4.0 and the digitalization of injection molding machines, important data of the injection molding process, including the cooling process, are required to be stored. The integrated mold cooling system of the injection molding machine can store the process data of the mold cooling link and the molding process data of the injection molding machine in a unified way, and the data stored in a unified way is more convenient for management and traceability. If the configuration is electronic temperature flow detector, although it also has the function of data storage, but its storage format, transmission mode may be different from the data of the injection molding machine, which brings a lot of inconvenience to the management and use of the data behind.

4 Summary

Lamesa 1 compares four configurations of mold cooling on the injection molding machine

Device, the advantages of injection molding machine integrated mold cooling system at a glance. With the development of mold technology, the importance of mold cooling is constantly improving. With the development of Industry 4.0, the concept of unmanned factories and lights-out factories is deepening, and the digitization of the injection molding process is a necessary condition. The integrated mold cooling system of the injection molding machine will be the necessary configuration of the high-end injection molding machine in the future.

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