To work, you must understand how to operate the equipment and have some basic knowledge of injection molding, and be able to use the injection molding machine correctly. If you do not know how to operate an injection molding machine, maintenance work will be very difficult, and fault diagnosis may also be unreliable. The circuit boards and electrical components in the injection molding machine have been affected by factors such as high temperature, environment, and time for a long time. The operating points of the devices shift and the aging of the components falls within the normal range. Therefore, debugging the injection molding machine is also one of the essential basic skills in maintenance work. It is very important to understand the working procedures of the injection molding machine and debug the electronic circuit and hydraulic oil circuit of the injection molding machine.
What should you pay attention to when repairing injection molding machines?
1. Non-professional maintenance personnel or without the permission of professional maintenance personnel are not allowed to remove the mold and repair it by themselves.
2. If a minor fault occurs during the production process, the machine adjustment personnel can solve it according to the situation.
For example: to stick the mold at the glue inlet: Use a copper needle to knock out the mold at the feed mouth. Do not use steel needles or other hard objects to knock the mold. There are slight mold marks in the cavity, and the polishing material can be selected according to the smoothness of the cavity. Polishing materials such as sandpaper cannot be used on the textured surface. Generally, a copper brush dipped in diamond paste or emery mortar is used to scrub, and it is completed by professional maintenance personnel. Product sticking to the mold: generally use hot plastic to cover the product and the ejection part, and then eject after cooling. If burning with fire, be careful not to damage the mold surface.
3. When professionals repair molds, they are not allowed to change the structure at will. Any changes to the structure must be approved by the quality engineering department before proceeding.
4. Ensure the quality of repairs, select appropriate equipment, materials, tools and methods to solve problems, and complete them as quickly as possible.
Injection molding machines are the integration of machinery, electronic control, and hydraulics. They are electrically complex, have crisscrossed hydraulic pipelines, and have various controllers. From the 1980s to the present, the fault phenomena of the products are also strange and different, especially for imported injection molding machines. They are expensive, costing tens to hundreds of thousands of dollars per unit.
There are thousands of components in a large injection molding machine. If one of the components is faulty, it will cause abnormal phenomena in the injection molding machine. There will also be problems with the connection of the wires. A little negligence will cause problems. In addition, large-scale injection molding The machine is bulky and can easily cause malfunctions due to environmental influences when used in an injection molding workshop without a constant temperature. For this reason, the problem of "difficult maintenance" of imported injection molding machines is placed in front of us.
How to repair the injection molding machine?
1. There is pressure but no action: First, check whether the display light of the mold opening valve on the output board is on. If it is on, it means that the computer output is normal. There is a problem with the line from the computer to the mold opening valve. The simplest way is to use a small electric pen to push the mold opening valve. , another person opens the mold. If the mold can be opened smoothly after pushing, it means that the routing problem is confirmed and the circuit problem can be solved by pulling another wire.
2. Read more information on electronic circuits of injection molding machines, read more, and understand the characteristics and functions of various electronic circuit systems of injection molding machines and PC and PLC programmable controllers; understand the alarms and troubleshooting methods of electronic circuit systems of injection molding machines. ; To understand the meaning of PC and PLC injection molding machine parameter settings; to understand the programming language of PC and PLC; to understand the method of injection molding machine action programming; to understand the operation of the injection molding machine control panel and the contents of each menu, often a large amount of information Heap, what do you think?
3. I think the main thing is to highlight the key points and understand the ins and outs. The key point is to understand the basic composition and structure of the injection molding machine controller and master the block diagram. The rest can be "toured" and read through, but each part of the content must be understood and mastered. Since the internal circuit diagram of the injection molding machine controller is quite complex, the manufacturer does not provide it. Therefore, it is not necessary to understand it in detail. It is necessary to focus on understanding the role of each part, the functions of each board, the whereabouts of the interfaces, the meaning of the LED lights, etc. Nowadays, there are many types of injection molding machine controllers and they are updated quickly. Different manufacturers and different models often vary greatly. To understand their commonalities and individualities.
4. Pay more attention to the electrical diagram of the injection molding machine and the electrical diagram of the digestion injection molding machine. For each electrical component, such as contactors, relays, time relays, etc., as well as the input and output of PCs and PLCs, you must indicate them one by one on the electrical diagram. .
5. Read more hydraulic diagrams and digest them thoroughly. For the mechanical and hydraulic diagrams of the injection molding machine, you must understand their functions and ins and outs. And indicate them one by one on the drawings, such as which solenoid valve is used to clamp the mold? What are the corresponding PC and PLC outputs and inputs? Write it down on the diagram, so that you can go from electrical to mechanical action in one step. At the same time, you must focus on understanding the parts that are closely related to mechanics and electricity. Now the injection molding machine uses electro-hydraulic proportional technology, and you must focus on understanding its role and function, especially Understand the adjustment methods and data, static and dynamic proportional valve currents and corresponding pump pressures, understand both electricity and machinery, mechatronics, and master multiple skills, so that you will have greater ability to solve problems.
Ask more injection molding machine experts. If you can have training opportunities or injection molding machine experts come to your factory to install and debug injection molding machines, you'd better have the opportunity to participate. This is the best learning opportunity because you can get a lot of first-hand information and injection molding machine debugging methods and techniques. If you don't understand, you have to figure it out. Through this period of time, there will be great gains, and a lot of internal information and manuals can be obtained (which are confidential to users). After the injection molding machine is put into formal production, you should always maintain close contact with experts related to the injection molding machine.
6. After a failure occurs, understand the entire process of the injection molding machine failure, what alarm number was generated, what components were operated at that time, what were touched, what were modified, and what was the external environment like? On the basis of fully investigating the site and mastering first-hand materials, correctly listing the fault problems has actually solved half of the problem, and then analyzing and solving them. For experienced and skilled injection molding machine operators, they are very familiar with injection molding. They are familiar with the operation of the machine, the processing procedures, and the common problems of the injection molding machine. Working closely with them is very beneficial for quickly troubleshooting.
You need to practice more, dare to do things, and be good at doing things. For injection molding machine maintenance personnel, they must be bold and careful, and dare to do things. If they can only talk but not do things, they will not be able to repair the injection molding machine. However, you must be familiar with the situation before taking action, and do not act blindly, otherwise the fault will expand and cause accidents with disastrous consequences.
7. The core of injection molding machine maintenance work is fault judgment and fault handling. It involves a wide range of knowledge, is highly complex, and has a certain depth (such as comprehensive professional knowledge level). It is necessary to have basic knowledge of mechanical equipment maintenance, hydraulic maintenance, and electrical maintenance. In fact, the maintenance work of the injection molding machine is difficult, but it is a process of continuous learning and progress. As long as you master the basic working principles and basic working methods of the injection molding machine, you can find a set of maintenance methods regardless of the various types of machines. Working procedures to ensure the normal operation of the injection molding machine.
