August 22, 2022
Injection molding machine purchase points
Injection molding machine is a common plastic machinery. For operators who use and purchase injection molding machines, they should first understand the performance of a good injection molding machine, and what aspects need to be evaluated before they can choose a satisfactory injection molding machine. Let's take a look at what aspects should be paid attention to when purchasing an injection molding machine.
The technical parameters of the injection molding machine for the purchase of the injection molding machine. Users can judge by vertical or horizontal comparison when purchasing an injection molding machine. The so-called "vertical" means that the main technical parameters of the injection molding machine should meet the industry standards and be examined according to the industry standards. The so-called "horizontal" is to compare the technical parameters of similar injection molding machines at home and abroad. Therefore, this is a very careful scientific work. It should be based on the material, shape, structure and even the application field and specific occasion of the injection molded product; according to the structure, quality, precision, number of cavities, type of runner and its structure, shape and size; according to the day, month, The annual production capacity automation degree, etc. to select the parameters of the injection molding machine at all levels.
When choosing a supplier for an injection molding machine, it is best to choose a manufacturer with a nearby service office. Because the structure of the injection molding machine is complex, it is inevitable that there will be problems. Fast after-sales service is very important. When purchasing, do not blindly seek low prices. The prices of domestic and imported accessories are very different, so you need to try to figure out what brand of accessories the manufacturer uses. Of course, you can't see some accessories, such as oil seals, bearings, etc., so the popularity and credibility of the manufacturer are very important at this time.
When choosing the model of the injection molding machine, the two main parameters of the injection molding machine are the injection volume and the clamping force. In order to ensure the quality of the processed products, the actual weight of a mold product should be within 70% of the theoretical injection volume of the machine. Calculate the required clamping force according to the projected area of the product. And pay special attention to the distance between the columns of the machine, the mold opening stroke and whether the minimum mold thickness is suitable for the mold.
The human-machine dialogue ability and operability of the injection molding machine. The injection molding machine should make its operation and management more user-friendly, the operation should be convenient, and the display should be clear, easy to understand, and clear at a glance. It has the function of parameter selection, product quality control, storage of mold data and automatic reproduction of various parameters, which can quickly diagnose and eliminate faults, reduce material waste in the shortest time, and restore the normal operation of the system. The stability, reliability, safety and service life of the machine are the main points of purchasing an injection molding machine. The stability of the machine is mostly manifested in whether the clamping mechanism and the injection molding system run smoothly in each cycle, and work in a silent, impact-free manner, and the noise must not exceed the industry standard. These situations are related to the mechanical manufacturing and assembly accuracy, as well as the rational design and structure of the toggle link. Reliability and service life are mainly reflected in the system rigidity of the clamping mechanism, which is related to the structure, size, material and heat treatment process of the template, tie rod, connecting rod and its pin shaft; the plastic warp system of the injection molding machine, such as the barrel , screw, screw head, non-return ring and the structure of the driving spindle of the screw and its manufacturing process, etc. These parts are the main stress and wear parts of the injection molding machine, which directly affect the service life. The safety of injection molding machines is very important. When the mold clamping mechanism opens and closes the mold, the reliability of the low-voltage protection system involves human-machine safety. Modern injection molding machines require the implementation of electrical, mechanical, and hydraulic joint safety protection systems. This protection mainly reflects two aspects: one is the safety protection of the mold, and the other is the personal safety protection. Before closing the mold, when the safety door is not closed, the mold closing should not be able to act; during the mold closing process, if the safety door is not closed to the correct position, the template action stops or the mold is automatically opened. If foreign objects, such as inserts, fall into the cavity by mistake due to vibration, etc., or other foreign objects, such as hands, are mistakenly placed in the mold when the mold is closed, the mold should stop the mold closing action, or automatically open the mold and alarm .
Another safety link of the injection molding machine is the prevention of cold start of the pre-molded screw. When the material of the screw does not reach the specified temperature and holding time, it is prohibited to start, otherwise an alarm will occur. The protective device for the injection molding machine nozzle splashing material is necessary to prevent burns.
The main points of purchasing an injection molding machine should have a high degree of automation, complete and perfect functions, and high production efficiency. Modern injection molding machines can realize manual, semi-automatic and fully automatic operation. As long as the mold design is reasonable, it can realize fully automatic operation from injection molding to ejection and dropping of products, and can also be equipped with a manipulator to realize unmanned operation. The core pulling function, the hydraulic nozzle control function and the fast heating runner probe function can be programmed into the automatic program in the injection molding cycle for automatic circulation. The high production efficiency is mainly reflected in the short molding cycle of each molded product under the normal injection molding process conditions. This is a comprehensive performance index reflecting the mechanical, electrical and hydraulic systems of an injection molding machine. Therefore, high-quality hydraulic and electronic components and sophisticated manufacturing techniques must be used to improve the sensitivity and repeatability of the injection molding machine system. It is a reliable guarantee that the injection molding system works efficiently.
The energy saving and environmental protection of the main points of purchasing injection molding machines are indicators that cannot be ignored when judging modern injection molding machines. Energy saving mainly reflects the water and electricity saving capabilities of the injection molding machine compared with similar machines under normal process conditions in the heating system (electromagnetic heating), power drive system (inverter, server, etc.) and cooling system. The design of modern injection molding machines should fully consider the theme of "environmental protection". The injection molding machine should prevent hydraulic oil leakage or excessive noise, and work quietly. In addition, the injection molding machine itself should also use more environmentally friendly materials.
The maintenance and overhaul of the machine, which is the main point of purchasing an injection molding machine, should be convenient. The installation position of various machines such as mechanical, hydraulic, electronic and electrical components should be conducive to the maintenance and repair of the machine. At the same time, the generalization and standardization of the injection molding machine is also very important to the user.