TRIZ (theory of inventive problem solving)-based injection mechanism for injection molding machine

A technology of injection molding machine and injection cylinder, applied in the field of injection mechanism of injection molding machine based on TRIZ

Inactive Publication Date: 2018-06-01
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Problems solved by technology

[0004] The purpose of the present invention is to design a TRIZ-based injection molding machine injection mecha...
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The invention provides a TRIZ (theory of inventive problem solving)-based injection mechanism for an injection molding machine. An original hydraulically powered injection system is replaced with an injection mode of directly pushing molten fluid by high-pressure air; a high-light injection technology and infrared radiation are adopted for heating. Experiments prove that with application of the TRIZ-based injection mechanism for the injection molding machine, production efficiency of a system and surface and inner quality of a product are improved qualitatively; bad characteristics of poor reliability, system complexity, environmental pollution, noise, unstable working performance and the like of the system are improved and enhanced fundamentally.

Technology Topic

Inventive problem solvingPower injection +5


  • TRIZ (theory of inventive problem solving)-based injection mechanism for injection molding machine
  • TRIZ (theory of inventive problem solving)-based injection mechanism for injection molding machine


  • Experimental program(1)

Example Embodiment

[0017] The injection molding machine is mainly composed of an injection device and a hydraulic transmission system. Among them, the injection device is composed of a plasticizing device, a hopper, a metering device, a screw drive device, and an injection cylinder. The hydraulic transmission system is mainly composed of hydraulic pumps, hydraulic valves, flow valves, pressure valves and other components.
[0018] Such as figure 2 As shown, through the investigation of the operation of the injection molding machine in actual production, it is found that the injection molding machine hydraulic system, injection mechanism and mold temperature control process currently have the following problems: (1) Due to the needs of the molding process and different production processes, the injection molding machine is in The flow rate and pressure required in the working process are often different and change frequently. Generally, different combinations of several quantitative pumps (double pumps for oil) and throttle valves are used to adjust the flow rate, and multiple remote control valves are connected in parallel to control the pressure. , To meet the production process, but for the output power, the quantitative pump and the regulating valve cannot be adjusted. As a result, the system has many components, low energy utilization (unreasonable energy utilization and energy leakage), and high heat generation in the system, which usually requires a cooling system; at the same time, a great impact and Vibration causes greater mechanical wear and noise, shortens the life of the system, and results in poor stability and production efficiency. (2) In the injection molding process, mold temperature is an important process parameter that affects the product molding process and product quality. A reasonable and evenly distributed mold temperature will directly affect the speed of plastic hardening in the mold cavity, the surface and internal quality of the injection product , Production efficiency, etc. At present, the mold heating and temperature control technology of many injection molding machines are still not up to the requirements. The effect of raising the temperature of the impression mold is still very unsatisfactory, and the production efficiency of the product is low. The unreasonable mold temperature results in a longer molding cycle, poor recovery of the mold, and low production efficiency. Especially for the improvement of the recovery of complex thin-walled products with local recessed features, it has great limitations. The filling effect of micro-feature holes is poor.
[0019] Such as figure 1 As shown, the problem (1) is analyzed. Because the quantitative pump and throttle valve of the injection molding machine cannot adjust the output power of the injection molding machine, it causes excess energy to leak in the baffle and oil circuit, resulting in excessive oil temperature. At the same time, due to the large number of system components, the unreasonable energy utilization, the wear of various valves and the shortened mechanical life, the oil filter and pipeline hinder the flow of hydraulic oil and the leakage is large, making the system energy consumption efficiency low. Therefore, it is necessary to improve parts wear, energy loss, high energy consumption, low efficiency, etc., but it will increase the complexity of the system. Therefore, there is a technical conflict between improving material and energy loss and increasing system complexity. The problem is generalized into the improved engineering parameter "material loss" and the deteriorated engineering parameter "system complexity". By querying the conflict matrix table, the corresponding invention principle for solving this conflict problem can be obtained, that is, the principle enlightenment of TRIZ special solution from the "28 mechanical system substitution principle" is: system reduction and substitution. The injection system using high-pressure air to directly push the molten plastic 1 replaces the original injection mechanism using hydraulic transmission and injection cylinder 18. The principle is: the electrical cabinet is used to control the size and direction of the voltage and current in the coil. When the current in the coil changes, magnetic fields of different sizes and directions will be generated inside the coil. According to the change of the magnetic field, the electromagnetic reversing valve 3 can be turned on and off within a specified time. Furthermore, the system controls the high-pressure gas to push a certain amount of molten plastic 1 with sufficient pressure according to the requirements of the injection molding process and production process. Fill the mold cavity, and hold and shape the molten plastic 1 in the cavity. To analyze the problem (2), higher mold temperature can make the melt easily fill the cavity, reduce the injection pressure, improve the surface quality of the product and the injection cycle, avoid premature cooling of the plastic, and poor fusion of the weld seam. However, too high mold temperature will result in lower melt viscosity, burrs, sink marks, difficult demolding, extended cooling time, etc., which will reduce the surface quality of the product, increase the injection cycle, and reduce production efficiency. Therefore, the injection cycle of the product should be shortened and the production efficiency of the product should be improved. At the same time, the undesirable characteristics of the product's surface quality and product deformation and the complexity of the system structure should also be eliminated. Therefore, the mold temperature is a conflict in the injection molding process. That is, there is a conflict between the productivity of the product and the improvement of the surface and shape quality and the increase of the structural complexity of the mold. Carry out the standardization of the problem, select the improved engineering parameter "productivity", and the deteriorated engineering parameter "device complexity" and "manufacturing precision". By querying the conflict matrix table, the corresponding invention principle for solving this conflict problem can be obtained, that is, the TRIZ special solution. Preheat the mold cavity before filling, and heat the mold cavity to a certain temperature. To: Adopt high-light injection process and use infrared heating. In this way, it can heat evenly and comprehensively, and it can also heat a very small area locally. It has high heating temperature, fast speed, easy temperature control, energy saving, no noise and dust pollution, which can greatly shorten the molding cycle and improve the filling performance , Improve the surface and internal quality of the product.


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