Injection molding machine brand injection molding machine knowledge directory injection molding machine can produce what injection molding machine working principle of injection molding machine types and characteristics of injection molding machine injection molding machine how to select the injection molding machine operating procedures injection molding machine maintenance injection molding machine common failure repair injection molding machine brand 1 injection molding machine what can be produced by the automotive industry: automotive headlight shells, most of the automotive interior parts, automotive bumper and so on.
Electronics industry: cell phone shell and part of the body parts, laptop shell, desktop computer monitor shell, mouse, keyboard, USB and so on.
Household appliances: TV shells, washing machines, refrigerators, hair dryers, telephones, power switches, sockets, electric kettle handles and bases and so on.
Daily necessities: microwave oven lunch box, water cups, plastic stools, plastic tables, plastic organizers, plastic flower pots, plastic dustpans, plastic bowls, plastic pots, plastic toys, water dispenser shells, drying racks and so on.
Cosmetic industry: some cosmetic packaging (bottles, lids) and so on.
Medical industry: disposable syringes, infusion tubes to adjust the amount of liquid on the device and so on.
Office supplies industry: whiteboard pens, ink pens, rulers, file holders, printer housings, copier housings, fax machine housings and so on.
We are surrounded by plastic things in addition to film and the belly of the bottle is made of blow molding, blister molding or thermoforming, most of the others are injection molding.
Detailed>>
2 working principle of the injection molding machine injection molding machine works with the needle with a syringe similar to the principle of injection molding machine, it is with the help of the screw (or plunger) of the thrust, will have been plastified in a good state of molten (i.e., viscous state) of plastic injection into the closed cavity, the curing and shaping of the products obtained after the process.
Injection molding is a cyclic process, each cycle mainly includes: dosing - melting and plasticizing - pressure injection - mold filling and cooling - open the mold to take parts. After removing the part, the mold is closed again for the next cycle.
Injection molding machine operation project: injection molding machine operation project includes control keyboard operation, electrical control system operation and hydraulic system operation in three aspects. They are injection process action, feeding action, injection pressure, injection speed, ejector type selection, barrel temperature monitoring of various segments, injection pressure and back pressure pressure adjustment, and so on.
General screw injection molding machine molding process is: first granular or powdered plastic added to the barrel, and through the rotation of the screw and barrel wall heating to make the plastic into a molten state, and then the machine for the mold and the injection seat forward, so that the nozzle close to the mold's gate channel, then to the injection cylinder through the pressure of the oil, so that the screw forward so that a very high pressure and high speed will be molten material Injected into the closed mold at a lower temperature, after a certain period of time and pressure to maintain (also known as holding pressure), cooling, so that the solidification of the mold, you can open the mold to remove the product (the purpose of holding pressure is to prevent backflow of molten material in the mold cavity, to the cavity to supplement the material, as well as to ensure that the product has a certain density and dimensional tolerances). The basic requirements of injection molding are plasticization, injection and molding. Plasticization is a prerequisite to achieve and ensure the quality of molded products, and in order to meet the requirements of molding, injection must ensure that there is sufficient pressure and speed. At the same time, due to the high injection pressure, the corresponding high pressure in the mold cavity (the average pressure in the mold cavity is generally between 20 ~ 45MPa), so there must be a large enough clamping force. Thus, the injection device and mold closing device are the key components of the injection molding machine.
Detailed>>
3 Types and features of injection molding machine Vertical injection molding machine
1, the injection device and clamping device are on the same vertical centerline, and the mold is opened and closed along the up and down direction. Its footprint is only about half that of a horizontal machine, so it is about two times more productive when converted to floor space.
2. It is easy to realize insert molding. Because the surface of the mold is facing up, inserts into the positioning is easy. It is easy to realize fully automatic insert molding by combining the lower template fixed, upper template movable machine, belt conveyor and robot.
3, the weight of the mold is supported by the horizontal template for the up and down opening and closing action, will not occur similar to the horizontal machine due to the gravity of the mold caused by the front fall, so that the template can not open and close the phenomenon. It is helpful to keep the precision of machine and mold persistently.
4, through a simple manipulator can take out each cavity of the plastic parts, which is conducive to precision molding.
5, the general clamping device around the open, easy to configure all kinds of automation devices, adapted to complex, delicate products automatic molding.
6, pull the belt conveyor is easy to realize the string over the middle of the mold installation, easy to realize the molding of automatic production.
7, easy to ensure the consistency of resin fluidity and mold temperature distribution within the mold.
8. Equipped with rotating table, moving table and tilting table, it is easy to realize insert molding and in-mold combination molding.
9, small batch trial production, the mold structure is simple and low cost, and easy to unload.
10, the test of many earthquakes, vertical machine due to the low center of gravity, relative to the horizontal machine seismic better.
Horizontal injection molding machine
1, even if the large machine due to the low body, for the placement of the plant has no height restrictions.
2. When the product can be dropped automatically, automatic molding can be realized without using a robot.
3. Due to the low body, it is easy to supply materials and easy for maintenance.
4, molds need to be installed by crane.
5.The molded products can be easily collected and packed by the conveyor belt under the arrangement of several sets side by side.
Corner injection molding machine
Corner injection molding machine injection screw axis and the axis of movement of the template clamping mechanism are arranged perpendicular to each other, the advantages and disadvantages of its between vertical and horizontal. Because of its injection direction and mold parting surface in the same plane, so the corner injection molding machine is suitable for the opening of the side gate of the non-symmetrical geometry of the mold or molding center does not allow traces of the gate products.
Detailed>>
4 injection molding machine how to choose the type of 1, choose the right type: by the product and the plastic to determine the machine type and series.
Because there are many types of injection molding machine, first of all, we must correctly determine which type of injection molding machine is suitable for this product, such as vertical and horizontal, or which series of injection molding machine. For example, the general thermoplastic plastic or Bakelite raw materials or PET raw materials, etc., is single-color, two-color, multi-color, sandwich or mixed colors. In addition, certain products require high stability (closed loop), high precision, ultra-high injection speed, high injection pressure or rapid production (multi-circuit) and other conditions, you must also choose the right series to produce.
2, put down: by the mold size to determine the machine's "column pitch", "mold thickness", "mold minimum size" and "mold plate size" is appropriate. Mold plate size" is appropriate to confirm whether the mold can be put down.
(1) The width and height of the mold should be less than or at least one side of the mold should be less than the inside distance of the column.
(2) The width and height of the mold should be within the size of the mold plate.
(3) The thickness of the mold should be between the mold thickness of the injection molding machine.
(4) The width and height of the mold need to meet the minimum recommended mold size for that injection molding machine, but not too small.
3, to get out: from the mold and the finished product to determine whether the "open stroke" and "mold stroke" is enough to allow the finished product to be taken out.
(1) The mold opening stroke should be at least twice the height of the finished product in the direction of mold opening and closing, and should include the length of the vertical sprue.
(2) The mold rest stroke must be sufficient to eject the finished product.
4, lock: by the product and the plastic to determine the "clamping force" tons.
When the raw material is injected into the mold cavity with high pressure, it will generate a force to hold up the mold, therefore, the clamping unit of the injection molding machine must provide enough "clamping force" so that the mold will not be held open. The clamping force requirement is calculated as follows:
(1) Find the projected area of the finished product in the direction of mold opening and closing from the finished product's exterior dimensions.
(2) Clamping force = the projected area of the finished product in the direction of mold opening and closing (cm2) x the number of mold cavities x the pressure in the mold (kg/cm2).
(3) The pressure in the mold varies with the raw material, and the general raw material is 350-400kg/cm2.
(4) The machine clamping force needs to be greater than the clamping force, and for insurance purposes, the machine clamping force usually needs to be greater than the clamping force of more than 1.17 times.
So far, the initial decision has been made on the specifications of the clamping unit, and to determine the approximate tonnage of the machine, then the following steps must be carried out to confirm that the screw diameter of the injection unit is more in line with the required.
Detailed>>
5 injection molding machine operating procedures 1.1 injection molding machine before the start of the preparatory work
1, clean up the environment around the equipment, do not allow the storage of items unrelated to production.
2, clean up the workbench and equipment inside and outside the debris, with clean cotton sand to wipe the injection guide and mold part of the tie rod.
3, check the equipment control switches, buttons, electrical wiring, operating handles, handwheels are not damaged or malfunction. Each switch, handle should be in the "off" position.
4, check the equipment safety protection devices are intact, work sensitive and reliable. Check whether the test "emergency stop" is effective and reliable, the safety door sliding is flexible, whether the switch can touch the limit switch.
5, the equipment on the safety protection devices (such as mechanical locking lever, stop plate, the safety protection switch, etc.) are not allowed to move casually, and not allowed to modify or intentionally make it useless.
6, check the parts of the screws are tightened, there is no loosening, found that the parts are abnormal or damaged phenomenon, should be reported to the foreman, the foreman to deal with their own or notify the maintenance personnel to deal with.
7, check the cooling water pipeline, test water to see whether the water flow is smooth, whether blocked or dripping.
8, check the hopper whether there are foreign objects, hopper is not allowed to store any items above the hopper, hopper cover should be covered to prevent dust, debris fall into the hopper.
1.2 injection molding machine start
1, close the machine's main power switch, check whether the equipment leakage, according to the set process temperature requirements for the barrel, mold preheating, in the barrel temperature to reach the process temperature must be kept warm for more than 20 minutes, to ensure that the barrel of the temperature of all parts of the barrel uniform.
2, open the oil cooler cooling water valve, the return oil and water pipeline cooling, start the oil pump, no abnormalities found before officially starting the oil pump, to be displayed on the screen "horse open" before running action, check whether the role of the safety gate is normal.
3, manually start the screw rotation, check the screw rotation sound is not abnormal and jammed.
Detailed>>
6 injection molding machine maintenance 1, daily inspection
daily inspection, adjustment of the safety facilities, must ensure that the safety facilities are normal, in order to use the operation of the machine; check the amount of oil in the lubricating oil tank must be added to the same brand of new oil; check the oil level on the hydraulic tank, if the oil level falls below the center line of the liquid level meter, the Add hydraulic oil to above the center line, must add the same grade of new oil; the first put into operation after 1000 hours, you need to replace or clean the suction filter, hydraulic oil, clean the oil tank; when running 5000 hours or up to one year, you need to replace or clean the air filter and hydraulic oil, pay attention to the old and the new hydraulic oil can not be mixed; when running 20,000 hours or up to 5 years, check and replace the hydraulic cylinder sealing ring and wear ring, replace the high-pressure hose; every 3 years, replace the controller (host) battery; every 5 years, replace the battery on the operating panel.
2, pay attention to lubrication
Injection molding machine use process, you need to regularly observe the injection molding machine lubrication points are in a normal working condition. Pay attention to each lubrication time must be enough to ensure that the entire lubrication system of each lubrication point to get good lubrication. The lubrication modulus (interval time) and each lubrication time of the machine are realized through the reasonable setting of computer parameters. Regularly observe the working condition of the lubrication system and keep the lubricant in the oil tank at a reasonable level. If poor lubrication is found, it should be lubricated in time and the lubrication condition of each lubrication point should be checked to ensure that the machine is well lubricated.
3, check the air filter
The role of the oil tank air filter is the oil tank breathing, and prevent the outside world of dust and other dirt into the oil tank, so it is a very important parts, the need for regular maintenance. The air filter is mounted on the top of the fuel tank, to clean, loosen the cover, replace the air filter element, and then re-tighten the cover. Note that the cap must be tightened, otherwise oil will be spilled.
Detailed>>
7 injection molding machine common failure repair motor does not run the oil pump sends an abnormal without any action does not close the mold does not open the mold reason
1, electrical power supply fuse blown; 2, start button connector is bad; 3, overload relay tripped; 4, the main circuit failure, the breaker is bad.
Treatment
1, replace the insurance; 2, overhaul or replace the relevant accessories.
Detail>>
Causes
1, inhalation of air on the inhalation side; 2, oil filter blockage; 3, wear and tear in the pump; 4, oil level is too low.
Treatment
1, repair the suction side of the joints; 2, clean the filter; 3, overhaul the oil pump; 4, add enough oil.
Detailed>>
Causes
1, the total pressure valve failure; 2, amplifier board failure; 3, motor, oil pump connecting flange failure; 4, servo valve solenoid coil glue down.
Treatment
1, repair the total pressure valve and amplifier board; 2, overhaul the connector; 3, install the solenoid coil.
Detailed>>
Cause
1, the top retreat is not in place; 2, the safety gate is not closed; 3, the robot does not give the signal to close the mold; 4, the position ruler data failure; 5, the directional valve does not operate.
Treatment
1, check whether the TO retreat terminated; 2, check the safety door of each circuit, oil circuit, mechanical insurance; 3, overhaul the manipulator bit power; 4, check the position ruler; 5, check the valve body whether the power supply, whether there is no jamming phenomenon.
Detailed>>
Cause
1, directional valve failure; 2, insufficient pressure; 3, curved hand mechanical card hole; 4, position ruler failure.
Treatment
1, check the valve body; 2, adjust the open mold pressure service; 3, overhaul the crank arm; 4, overhaul the position ruler.
Detailed>>
8 injection molding machine brand industry recommended brands Haitian International IZUMI YIZUMI force Jin L.KKraussMaffei KraussMaffei Demag Sumitomo Demag Husky Husky BORCHEENGEL ENGEL Terry machine Tederic Donghua Machinery WELLTEC