How to select the mold temperature control machine, the working principle of the mold temperature co

Mold temperature controller is a new, safe, high-efficiency and energy-saving, low pressure (under normal pressure or low pressure) and can provide high temperature heat energy of special equipment, mold temperature control machine is a chemical, petroleum, machinery, printing and dyeing, food, shipbuilding, textile, film and other industries in a kind of high-efficiency and energy-saving heating equipment, you can choose to adjust the electric power, can greatly reduce the production cost, and the use of electric heating, clean energy, environmental protection and pollution-free. The use of products in all walks of life, as well as the use of heating power, are different, how to choose the following points:

1. The size and capacity of the pump;

2. The size of the internal pipe;

3. Heating capacity;

4. Cooling capacity;

5. a form of control;

Choose the appropriate mold temperature controller. Indiscriminately buying a mold temperature controller can bring a 20% loss of profit at any time, so it is necessary to choose the corresponding model through calculation.

We recommend the following main considerations:

1.The size and capacity of the pump. 2.The size of the internal pipe. 3.Heating capacity. 4.Cooling capacity. 5.Form of control.

Choose the appropriate mold temperature controller. Indiscriminate purchase may bring loss of profit at any time, and it is necessary to choose a regular mold temperature machine manufacturer.

The simplest temperature controller is the bimetal sheet, which uses the principle of different expansion coefficients of two different metals to work, and the two different metal sheets are pasted together, when the temperature rises, due to the different expansion coefficients, the metal sheet will bend to the side with a small expansion coefficient, driving the switch action, when the temperature decreases, it will bend to the other side, the thermostatic switch (action temperature 80) in the water dispenser, and the thermal insulation switch in the rice cooker all use this thermostat. When the temperature changes, the resistance of the semiconductor changes accordingly, and then the amplification circuit amplifies the change, when the temperature reaches the set value, corresponding to a corresponding resistance value, then the amplification circuit will output a switch signal to the corresponding actuator, such as disconnecting the heating circuit, so that the temperature is not too high. The principle is the same when the temperature is reduced.

Usually the temperature of the mold is controlled by a combination of temperature control chambers and heating rings. 1.Mold temperature control methodThere are several ways to adjust the temperature of the plastic mold by heating or cooling, and the mold body can be heated and heated by steam, hot oil circulation, hot water circulation and resistance.

The cooling of the mold can be carried out by cooling circulating water or air. The temperature regulation of the mold used in the injection molding machine is mostly used in resistance heating and cooling water circulation cooling. When the resistance heats the mold, the flat part is heated with a resistance wire heating plate, the cylinder part is heated with an electric heating ring, and the mold body is heated with an electric heating rod.

The mold needs to be cooled and cooled, and the circulating water pipe is arranged to cool down. Resistance heating and cooling water circulation, the two work alternately according to the temperature conditions of the mold body, so that the mold temperature is controlled within the temperature range of the process requirements. 2.

Precautions for mold temperature control 1) The temperature of each part of the molding mold after heating should be uniform to ensure that the melt has a good filling quality, so that the molding quality of injection molding products is guaranteed, and the pass rate of injection molding products is improved. 2) The process temperature adjustment of the mold should be determined by the viscosity of the melt. For higher viscosity melt injection into the mold, the temperature of the mold body should be adjusted slightly higher; The lower viscosity melt filling mold can appropriately reduce the temperature of the mold body.

When preparing for injection production, the temperature of the mold body must be within the process requirements. In order to ensure that the temperature of the mold body is uniform, the mold body heated to the temperature required by the process should be kept at a constant temperature for a period of time. 3) When injection molding large-scale plastic products, due to the large amount of melt used for molding, the melt runner is more harmonious, and the large mold body should be heated and moisturized at the melt runner part, so as to prevent the melt flow from being cooled down and increase the viscosity of the melt due to the long melt runner, so that the material flow slows down, affects the quality of the melt injection filling mold, and even causes the melt to cool down and solidify in advance, so that the injection work of the injection molding machine cannot be carried out.

4) In order to reduce the cooling of the melt and increase the heat loss due to the long melt runner, a thermal insulation and moisturizing layer should be added between the low temperature part of the mold cavity and the high temperature part of the melt runner.

According to different industries and technical requirements, the most successful mold temperature control methods include electric heating mold temperature machine, oil temperature machine for high-temperature oil heat transfer, steam Vain, electromagnetic induction direct heating system and infrared radiation heating system.

Mold temperature control machine refers to a kind of heating equipment used for mold temperature control, which is divided into two types: water temperature machine and oil temperature machine. There are many models and specifications, and they are selected and configured according to different processes.

1.Water or oil can be used as the heat transfer medium according to the needs.

2.Choose the PID intelligent automatic calculating temperature controller, which can accurately display and control the mold temperature difference within 1 of the desired temperature.

3.The two-stage heating structure design can increase or decrease the power according to the required temperature, and with the special heating structure, it can save time and electricity.

4.Thoughtful protection devices, such as fuseless switches, water or oil shortages, abnormal temperatures and pump overloads, and other automatic reminder systems, the circuit can be automatically cut off to ensure safety.

System control, the selection of imported thermostat, the temperature difference is 1

The role of the mold temperature control machine:

1.Before molding, the mold temperature controller heats up quickly and always maintains a constant temperature, reducing the man-hours required for mold preheating.

2.Productivity can be improved by continuous operation without the fear of high mold temperatures, and downtime during the process without having to wait for the mold temperature to rise due to a decrease in mold temperature.

3.Plastics have the physical characteristics of thermal expansion and cold contraction, so if the mold temperature is unstable or not properly controlled, it will cause water lines, shrinkage, distortion, deformation and poor surface gloss of the mold, and the use of TMC models can solve such problems.

4.It can promote the mold to maintain the appropriate temperature, greatly reduce the number of molds and reduce the defect rate of molded products, and ensure product quality.

The mold temperature control machine, also known as the mold temperature machine, works by maintaining thermal balance and adjusting the temperature through heating and cooling functions. It can be used to control the temperature of molds, rollers, reactors, presses and other equipment.

The mold temperature controller is composed of a control system, a heating pipe, a cooler, a circulating pump, a liquid level detection, a temperature detection and a pressure controller. The principle of the mold temperature machine is to control the temperature by adjusting the heating and cooling actions by the controller. Liquid level, temperature, pressure monitoring system, real-time feedback information to the controller, after processing, the mold temperature controller will give heating or cooling signals.

Typically, a pump in a power transmission system causes the hot fluid to reach the mold from the tank with built-in heaters and coolers, and from the mold back to the tank; The temperature sensor measures the temperature of the hot fluid and transmits the data to the controller in the control section. The controller regulates the temperature of the hot fluid, and thus indirectly regulates the temperature of the mold. If, in production, the temperature of the mold exceeds the set value of the controller, the controller will open the solenoid valve and connect the water inlet pipe until the temperature of the hot flow liquid, that is, the temperature of the mold, returns to the set value. If the mold temperature falls below the set point, the controller turns on the heater.

Mold temperature control machine, also known as mold temperature control machine, was originally used in the temperature control industry of injection molds. Later, with the development of the machinery industry, the application is more and more extensive, and now the temperature controlled by the mold temperature machine is generally divided into water temperature machine and oil temperature machine, which can reach positive and negative degrees.

The mold temperature machine is composed of a water tank, a heating and cooling system, a power transmission system, a liquid level control system, a temperature sensor, an injection port and other devices. Typically, a pump in a power transmission system causes the hot fluid to reach the mold from the tank with built-in heaters and coolers, and from the mold back to the tank; The temperature sensor measures the temperature of the hot fluid and transmits the data to the controller in the control section. The controller regulates the temperature of the hot fluid, and thus indirectly regulates the temperature of the mold. If the temperature of the mold exceeds the set value of the controller during the production of the mold temperature machine, the controller will open the solenoid valve to connect the water inlet pipe until the temperature of the hot flow liquid, that is, the temperature of the mold, returns to the set value.

If the mold temperature falls below the set point, the controller turns on the heater.

The mold temperature controller is composed of a water tank, a heating and cooling system, a power transmission system, a liquid level control system, a temperature sensor, an injection port and other devices. Typically, a pump in a power transmission system causes the hot fluid to reach the mold from the tank with built-in heaters and coolers, and from the mold back to the tank; The temperature sensor measures the temperature of the hot fluid and transmits the data to the controller in the control section. The controller regulates the temperature of the hot fluid, and thus indirectly regulates the temperature of the mold.

Its main functions are:

1. Improve the molding efficiency of products;

2. Reduce the generation of defective products;

3. Improve the appearance of the product and inhibit the defects of the product;

4. Speed up the production progress, reduce energy consumption and save energy.

The mold temperature machine and the mold are designed with the following parameters:

1. What is the working temperature to be reached by the mold?

2. Is the heat conduction medium of the mold temperature machine required by the mold temperature machine water or heat conduction oil 3. How long does the mold heat from room temperature to the maximum temperature.

4. What kind of product is the mold playing?

5. Mold hot runner interface.

Generally, such as injection molding machine molds, the temperature control requirements are relatively simple. When matching the mold temperature machine, it is only necessary to provide the mold temperature machine supplier with the size of the mold clamping force of the injection molding machine, and the mold temperature machine will be matched according to the mold clamping force.

In the case of die-casting molds, the above parameters should be actually provided and selected through detailed calculations.

1. The maximum operating temperature is 40 -180, and the accuracy is 1;

2. The microcomputer touch control operation is simple;

3. Automatic exhaust when starting;

4. Outlet and return water temperature display;

5. Mold water return function (optional);

6. Stainless steel pipeline, reduce pipe yin and rust;

7. Fault display, maintenance without professionals.

The power of ordinary water heating series is 6kw-30kw, and the temperature is 30 120;

Ordinary oil heating series power is 6kw-72kw temperature at 30 200;

High temperature water heating series power 6kw-120kw temperature in 120 180;

High temperature oil heating series power 18kw-120kw temperature at 250 350 .

1. The thermal balance control of the injection mold is the key to the production of injection molded parts. Inside the mold, the heat brought by the plastic (e.g., thermoplastic) is transferred to the material and the mold's steel through thermal radiation, and to the heat conductive fluid by convection. In addition, heat is transferred to the atmosphere and the formwork through thermal radiation.

The heat absorbed by the heat transfer fluid is taken away by the mold temperature machine.

2. The purpose of controlling the mold temperature and the influence of the mold temperature on the injection molded parts In the injection molding process, the main purpose of controlling the mold temperature is to heat the mold to the working temperature, and the second is to keep the mold temperature constant at the working temperature. If the above two points are successful, the cycle time can be optimized, and the consistent high quality of the injection molded parts can be guaranteed. Mold temperature affects surface quality, flowability, shrinkage, cycle time, and deformation.

Too high or too little mold temperature can have different effects on different materials. For thermoplastics, a slightly higher mold temperature usually improves surface quality and flow, but increases cooling time and injection cycles. A lower mold temperature will reduce shrinkage within the mold, but will increase the shrinkage of the molded part after demolding.

In the case of thermosets, a slightly higher mold temperature usually reduces the cycle time, which is determined by the time it takes for the part to cool down. In addition, in the processing of plastics, a higher mold temperature will also reduce the plasticizing time and reduce the number of cycles.

3. The temperature control system is composed of three parts: the mold, the mold temperature machine, and the heat conduction fluid. In order to ensure that heat can be added to or removed from the mold, the following conditions must be met in all parts of the system: first, inside the mold, the surface area of the cooling channels must be large enough and the diameter of the flow channel must match the capacity of the pump (pump pressure).

The temperature distribution in the cavity has a great influence on the deformation of the part and the internal pressure. Proper setting of the cooling channels can reduce the internal pressure and thus improve the quality of the injection molded parts.

It also reduces cycle times and product costs. Secondly, the mold temperature machine must be able to keep the temperature of the heat conduction fluid constant in the range of 1 -3, which is determined according to the quality requirements of the injection molded parts. The third is that the heat transfer fluid must have a good heat conductivity and, most importantly, it must be able to introduce or export a large amount of heat in a short period of time.

From a thermodynamic point of view, water is significantly better than oil.

Mold temperature control machine has a wide range of applications:

1. Food and chemical industry: polymerization, condensation, distillation, melting, dehydration, forced heat preservation, etc.

2. Oil industry: fatty acid distillation, oil decomposition, concentration, esterification, vacuum odor and other reactor temperature control, reactor heating, etc.

3. Synthetic fiber industry: polymerization, melting, spinning, extension, drying, etc.

4. Textile printing and dyeing work: heat setting roller heating, drying room heating, heat capacity dyeing, etc.;

5. Rubber industry: hot pressing, calendering, extrusion, vulcanization molding, etc.

6. Wood industry: plywood, fiberboard pressure molding, laminate heating, hot pressing plate heating, hydraulic machine temperature control, wood drying, etc.

7. Building materials industry: gypsum board drying, asphalt heating, concrete component maintenance, etc.

8. Machinery industry: painting, printing and drying, etc.