Key points of the purchase of injection molding machine
Injection molding machine is a common plastic machinery, for the use and purchase of injection molding machine operators, first of all, we should know what good performance of the injection molding machine, from what aspects need to be evaluated, in order to choose a satisfactory injection molding machine, Let’s understand what we should pay attention to when choosing an injection molding machine.
- Technical parameters of injection molding machine
Users can choose injection molding machine by longitudinal or horizontal comparison to distinguish. The so-called “vertical” is that the main technical parameters of the injection molding machine should meet the industry standards, according to the industry standards. The so-called “horizontal” is compared according to the technical parameters of similar injection molding machines at home and abroad. So it’s a very careful, scientific exercise. According to the injection molding products of the material, shape, structure and application of the field and specific occasions; According to the mold structure, quality, precision, the number of cavity, the type of flow channel and its structure, shape, size; According to the day, month, year of production capacity automation degree of products to choose injection molding machine parameters at all levels.
- Select injection molding machine suppliers
It is best to choose a vendor with a service office nearby. Because the structure of injection molding machine is complex, problems are inevitable, and fast after-sales service is very important. Do not seek low price blindly when purchasing, the price difference of spare parts of injection molding machine has big difference in homebred and import. You need to find out what brand of accessories the manufacturer is using. Of course, some accessories you can’t see, such as oil seals, bearings, etc., so at this time, the visibility and reputation of the manufacturer is very critical.
3.Choice the model of injection molding machine
The two main parameters of an injection molding machine are injection volume and clamping force. In order to ensure the quality of the processed products, the weight of the actual mold product should be within 70% of the theoretical injection volume of the machine. Calculate the required clamping force according to the projection area of the product. And Pay attention to whether the distance between the columns, the stroke of opening the die and the minimum die thickness are appropriate for the die.
Man-machine dialogue ability and operability when purchasing. The operation and management of injection molding machine should be more humanized, 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, mold data storage and automatic reappearance of various parameters. It can diagnose and eliminate faults quickly, reduce material waste in the shortest time, and restore the normal operation of the system. The main point of choosing injection molding machine is the stability, reliability, safety and service life of the machine. The stability of the machine is mainly reflected in whether the mold closing mechanism and injection molding system run smoothly in each cycle, work in the silent without impact, and the noise shall not exceed the industry standard. These situations are related to the mechanical manufacturing and assembly precision, and also related to the reasonable design and structure of the curved elbow connecting rod.
Reliability and service life are mainly reflected in the system rigidity of the clamping mechanism. It is related to the structure, size, material and heat treatment process of formwork, tie rod, connecting rod and pin shaft. The plastic system of injection molding machine such as barrel, screw, screw head, reverse ring and screw drive spindle structure and manufacturing process.These parts are the main stress parts and wear parts of the injection molding machine, which directly affect the service life. The safety of injection molding machine is very important. The reliability of the low pressure protection system is related to the safety of human machine when the die closing mechanism is opening and closing. Modern injection molding machine must implement the combined safety protection system of electrical, mechanical and hydraulic, which mainly reflects two aspects: One is the safety protection of the mold, the other is the safety protection of the person. Before closing the die, when the safety door is not closed, the die should not be able to move; In the process of closing the die, if the safety door is not closed to the correct position, the template action will stop or automatically open the die. If the foreign body, such as the insert, falls into the cavity due to vibration and other reasons, or there are other foreign bodies, such as starting, etc., into the wrong mold when the mold is closed, the mold should stop the closing action, or automatically open the mold and alarm.
Another safety link of injection molding machine is to prevent cold start of pre-molded screw. When the screw material does not reach the specified temperature and insulation time, it is forbidden to start, otherwise there will be an alarm. Spatter protection from injection molding machine nozzles is necessary to prevent burns.
The key points of injection molding machine should be high degree of automation, complete and perfect functions, high production efficiency. Modern injection molding machine can realize manual, semi-automatic and automatic operation, as long as the mold design is reasonable, it can realize the automatic operation from the injection mold filling to the product ejective fall, but also equipped with manipulator to achieve unmanned operation. Core pumping function, hydraulic nozzle control function and fast heating runner probe function can be programmed into the injection molding cycle automation program, automatic circulation. High production efficiency is mainly reflected in, each mold products in the normal injection molding process conditions, molding cycle to short. This is a reflection of an injection molding machine mechanical, electrical, hydraulic system comprehensive performance index. Therefore, it is necessary to use high quality hydraulic and electronic components, the use of precision manufacturing technology to improve the sensitivity of the injection molding machine system and the repeated precision, which is the injection molding system efficient work is reliable guarantee.
The key points of choosing injection molding machine are energy saving and environmental protection, which can not be ignored in judging modern injection molding machine. Energy saving, mainly reflects the injection molding machine in the heating system (electromagnetic heating), power drive system (inverter, server, etc.), heat dissipation system to meet the normal process conditions compared with similar machine water saving, electricity saving ability. The modern injection molding machine design should fully consider the theme of “environmental protection”. Injection molding machine should prevent hydraulic oil leakage or excessive noise, to work quietly. In addition, the injection molding machine itself should also be more environmentally friendly materials.
The key to choose injection molding machine is to facilitate the maintenance of the machine. All kinds of machines such as mechanical, hydraulic, electronic, electrical components should be installed in a position conducive to the maintenance and repair of the machine. At the same time, the degree of generalization and standardization of injection molding machine is also very important to users.
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