EVA injection molding machine is the solid plastic plastination, and then with the help of a screw, at a certain pressure and speed into the closed mold cavity, after curing, a thermoplastic molding equipment to obtain products.
Injection molding machine is generally composed of injection device, mold closing device, frame, transmission, hydraulic and electrical system and other main components. In the process of injection molding, the injection molding machine has the rotary, linear and spiral motion of mechanical equipment, the kinetic energy transfer of hydraulic equipment, and the heat energy conversion of electric heating device, which puts forward more requirements for lubrication work. Of course, for the lubrication of injection molding machine, we can follow the general rules of lubrication of mechanical equipment, hydraulic equipment and electric heating equipment according to the way of movement, but some parts (such as injection parts and transmission, etc.) need to be considered comprehensively and adopt the method of mixed lubrication.
(I) Lubrication of a manual or semi-automatic plastic injection molding machine
1. Lubrication of gear transmission
Any failure of the gearbox will affect the quality and quantity of processing. Uniform and reliable lubricating oil film should be ensured for hardened spur gears and tempering shafts in the box. Generally, oil cup and splash lubrication can meet the lubrication requirements.
2. Lubrication of injection parts
The role of the injection part is to make the plastic uniformly heated to the injection temperature through the electric heating ring, and the injection pressure is formed by the screw pressure of the press rod. The lubrication of the press bar generally adopts oil cup, oil rope and other lubrication methods.
3. Lubrication of mold locking part
The die locking component is composed of belt pulley, lead screw, nut, vice, etc. Adjust the position of the bump block on one side of the vice and match with the travel switch on the frame to control the feed stroke of the lead screw and make the vice reach the opening and closing die. Because the screw and nut friction junction is small, the oil film is easy to be squeezed and cracked, so the lubricating oil should have good oil, generally using L-AN46 oil or HL hydraulic oil through the oil cup, oil rope lubrication.
4. Lubrication of the frame part
The sliding guide on the frame is generally made of cast iron. Because the load and speed of the guide rail are not large, the mineral lubricating oil can ensure a certain boundary oil film. Generally, after gently touching the guide surface with the hand, an oil film is considered to have been maintained on the guide surface if the oil trace can be seen on the hand.
(ii) Lubrication of automatic hydraulic injection molding machines
The characteristics of this injection molding machine are: high degree of automation, stable performance, and electrical, hydraulic interlock protection device, high precision, more complex structure.
1. Lubrication of the injection part
Because this part is to complete the injection of the double cylinder pull the pre-plastic change gear box, through the gearbox to push the screw, the uniform plasticized plastic into the film cavity, the implementation of injection molding of the key components. The movement is more frequent, and there are electric heating devices, must strictly implement the lubrication system. Main lubricating parts of this part:
(1) Add L-AN46 total loss system oil on injection seat and frame guide surface, once per shift.
The bottom of the gear box (roller) guide rail surface with L-AN46 total loss system oil, once per shift.
⑶ Grease the center of rotation, about 0.3L.
⑷ The L-AN46 total loss system oil in the gearbox is about 10L.
2. Lubrication of mold moving parts
The mould shifting adopts hydraulic power, selects direct pressure filling device, simple structure, reliable action, less lubrication point. Mainly to ensure the formation of lubricating oil film on the four guide posts, available L-AN46 mechanical oil through the oil cup, oil rope lubrication.
3. Motor lubrication
Most of the automatic hydraulic injection molding machines are driven by multiple motors. When performing daily lubrication, the motors should be lubricated according to the requirements.
