According to statistics, about 70% of China's plastic machinery is an injection molding machine. From the perspective of major producing countries such as the United States, Japan, Germany, Italy, and Canada, the output of injection molding machines is increasing year by year, accounting for the largest proportion of plastic machinery.
With the rapid development of China's injection molding market, the related core production technology application and research and development will become the focus of attention in the industry. Understanding the R&D trends, process equipment, technology applications and trends of core technologies for injection molding at home and abroad is critical for companies to improve product specifications and improve market competitiveness.
In the injection molding industry, in 2006, the proportion of injection molds further increased, the level of hot runner molds and gas-assisted molds further improved, and the injection molds developed rapidly in terms of quantity and quality. The largest set of injection molds in China has exceeded 50 tons. The precision of the most accurate injection molds has reached 2 microns. At the same time that CAD/CAM technology is popularized, CAE technology is becoming more and more widely used.
In current production, the injection pressure of almost all injection machines is based on the pressure exerted by the plunger or the top of the screw on the plastic. The injection pressure in the injection molding process is to overcome the movement resistance of the plastic from the barrel to the cavity, the speed of filling the melt and the compaction of the melt.
Injection molding machine energy saving, cost saving is the key
The injection molding machine is the largest variety of plastic machines produced and used in China, and is also an assistant to China's plastic machine exports. In the late 1950s, the first injection molding machine was produced in China. However, due to the low technical content of the equipment at the time, it was possible to use general-purpose plastics to produce daily necessities such as plastic boxes, plastic drums and plastic pots. Injection molding technology has developed rapidly in China, and new technologies and new equipment are emerging one after another. The computer is highly automated. Automation, single-machine multi-function, diversified auxiliary equipment, rapid combination, and easy installation and maintenance will become a trend.
If you reduce the energy consumption of injection molding machines, you can not only reduce the cost for injection molding machine companies, but also contribute to domestic environmental protection. The industry believes that energy-saving and safe injection molding machine products have an important role and positive impact on promoting the transformation and upgrading of China's plastic machinery industry and building a new industrial structure.
Traditional plastic machinery also has certain potential in terms of energy saving, because the previous designs often only focus on the production capacity of a single machine. In the design of energy-saving plastic machinery, production speed is not the most important indicator, the most important indicator is the energy consumption of processing unit weight products. Therefore, the mechanical structure, control mode, and operating process conditions of the equipment must be optimized based on minimum energy consumption.
At present, the energy saving in the field of injection molding machines in Dongguan has two mature methods of inverter and servo motor, and servo motors are more and more widely accepted. Servo energy-saving series injection molding machine is equipped with high-performance servo variable speed power control system. During the molding process of injection molding machine, different frequency output is made for different pressure flow, and precise closed-loop control of pressure flow is realized to realize servo motor to injection molding. High-speed response and optimal matching and automatic adjustment of energy saving energy requirements.
The general injection molding machine uses a fixed pump to supply oil. The various actions of the injection molding process have different requirements for speed and pressure. It uses the proportional valve of the injection molding machine to adjust the excess oil through the return line. Returning to the fuel tank, the rotation speed of the motor is constant throughout the process, so the oil supply amount is also fixed, and since the execution action is intermittent, it is not likely to be full load, so the quantitative oil supply is very large. The wasted space is estimated to be at least 35-50%.
Servo motor is aimed at this waste space, real-time detection of proportional pressure and proportional flow signal from the numerical control system of the injection molding machine, timely adjustment of the motor speed (ie flow regulation) required for each working condition, so that the pumping flow and pressure, Just enough to meet the needs of the system, and in the non-operating state, let the motor stop running, so that the energy saving space is further increased, so the servo energy-saving transformation of the injection molding machine can bring good energy-saving effect.
Some advice for injection molding machine companies
First of all, we should establish an export-oriented development strategy, vigorously expand exports, and create conditions for our products to enter the international market. In particular, superior products should strengthen export efforts and increase market share. Encourage more enterprises to go to the peripherals research institutes, enterprises, especially Southeast Asia, the Middle East, Africa, Russia and Eastern Europe have great potential.
