德语
During the production process of thermoformed products, the mold needs to be continuously water-cooled and cooled to ensure that the mechanical properties of the parts meet the requirements during the continuous production process. The pressure, flow rate and flow rate of the cooling water in the mold have a direct impact on production efficiency and quality. In order to ensure the quality of the product produced, the water tightness of the mold must be effectively guaranteed, and the flow rate and flow rate in the water circulation system need to be monitored. Therefore, the sealing of the mold waterway needs to be tested during the mold assembly process.
1. Functional Requirements
The watertightness detection device can simulate the state of the cooling system during the production process, and is used to detect the watertightness and leakage points of the mold waterway to fill and block, and to clean impurities in the mold waterway. This device can perform simulation and testing processes in the assembly area, which has strong mobility, reduces press working hours, improves the efficiency of the press, makes the working location of the mold watertightness detection flexible, improves the overall working progress, and shortens the assembly cycle.
According to the production process requirements, when the thermoforming mold enters the production line for production, the water pressure of the production line is set to enter the mold waterway to 8 MPa. Therefore, during the mold assembly process, it is necessary to ensure that there is no water leakage at a pressure slightly higher than this to meet the production line production requirements.
2. Structure
The water test device and the mold are independent individuals, and the rectification device consists of a water storage unit, a control and detection unit, a connecting unit, and a mobile unit. The water storage module includes a water tank, a filter mesh, and a magnet. The control and detection unit includes a water pump, a throttle valve, a pressure gauge, and a flowmeter. The connecting unit includes water pipes and quick connectors. The mobile unit includes a flatbed car that carries the entire device. The device diagram is shown in Figure 1. When using the module device, it is necessary to connect to the mold through the inlet and outlet pipes to form a closed loop with the water path in the mold. Therefore, in the early mold design, corresponding connection ports need to be designed on the mold. In actual operation, in order to facilitate disassembly and assemble water pipes, quick joints are designed and installed to achieve quick connection with the water test device. The functions and specifications of structural components are shown in Table 1.
3. Principle
In the design stage of thermoforming mold, in order to meet the cooling requirements in actual mold production, in the process design, through calculation simulation, there are specific set values for the flow rate and flow rate of the mold waterway. Only when the actual value is greater than or equal to the set value, the production process and product of the mold can meet the quality requirements of the product itself. Therefore, in order to ensure that the simulated state in the inspection is the same as the actual production state, during the manufacturing process of the detection equipment, there are certain range requirements for the selection of water pumps, and it is necessary to select a water pump with a flow range that meets the needs. See Figure 2 for device experiments.
During the water processing process of thermoforming molds, a small amount of metal debris will remain in the water channel, and it is difficult to avoid dust and impurities entering the water channel during assembly. It is easy to cause the water channel with small holes to be blocked for a long time and the water channel is not circulated, which seriously affects the cooling effect of the mold in the actual production process. Therefore, before the mold enters the production line for formal production, the mold water channel needs to be cleaned to ensure the unblocking of the water channel to ensure the cooling effect of the mold in the actual production process.
4. How to use
After the device is connected to the mold, the water pump passes the cooling water into the mold and applies pressure. It seals the water into the mold by relying on the throttle valve [12] to keep the water pressure above 8 MPa. After 10 minutes, the pressure drop is detected to confirm the sealing effect. If the pressure drop changes slightly and there is no water leakage in the overall mold, it is proved that the sealing of the mold waterway meets the production line production requirements; if the pressure drops significantly, or the mold has water leakage, it is proved that the watertightness of the mold does not meet the requirements.
After the device is connected to the mold, the water pump injects water into the mold to form a cooling water system circulation. The electronic flow velocity and flow meter on the equipment are measured through the electronic flow velocity meter and flowmeter on the equipment to ensure that the sealing of the mold waterway meets the process design requirements.
Use an aqueous solution containing a certain concentration of cleaning agent to circulate in the mold waterway to effectively bring out the remaining iron filings and impurities with oil stains in the waterway. A filter and an electromagnet device are designed in the water tank of the device. The filter is used to collect non-metallic impurities and large-particle metal impurities, and a small-particle metal impurities are collected by electromagnets. After the cleaning is completed, the collected impurities are cleaned up in a concentrated manner.
During the mold assembly process, since the storage site is not fixed, the water test device needs to be independent, easy to move and use, and small footprint. Therefore, a movable unit is added during the design, and the device can be flexibly moved, making the location of the water-tight simulation and testing process of the mold waterway waterway become flexible, and the simulation and testing location can be flexibly selected.
5. Conclusion
The watertightness detection device can simulate the state of the cooling water path of the thermoforming mold during the production process, and is used to detect the watertightness and water leakage points of the thermoforming mold water path to fill and block, and clean impurities in the mold water path. This device can ensure that the waterway sealing is qualified before the thermoforming mold enters the production line, so that it can be debugged and produced smoothly on the production line. During the design and manufacturing process, the effective utilization of the production capacity of the trial line press is maximized, the working time consumption of the watertightness detection of the upper and lower presses of the mold is reduced, the location of the watertightness detection process is flexible, and the watertightness detection of the mold is flexibly selected, which improves the working efficiency of the mold watertightness detection, saves the mold manufacturing cost, shortens the mold assembly cycle, and improves the overall work progress. This device has a wide range of applications and can be used for waterway sealing detection in the mold manufacturing stage. It is also suitable for post-maintenance and maintenance of molds, checking and inspecting the sealing of molds and performing maintenance.
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