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What is the reason for the unstable pressure when the injection molding machine shoots glue?
2025-01-22
What is the reason for the unstable pressure when the injection molding machine shoots glue?
On the stage of injection molding production, the injection molding machine is the protagonist, and the stability of the injection pressure is the key element to ensure the wonderful performance.When the pressure is “convulsed” when the glue is shot, the quality of plastic products will fluctuate like a roller coaster.Which “behind-the-scenes” are making trouble?And listen to the decomposition.
1. The hydraulic power source “loses its temper”
As the power heart of the hydraulic system, the hydraulic pump, if it is “sick”, the entire injection pressure will follow the “pendulum”.Imagine that the plunger and blade in the pump are worn out excessively, just like an athlete's leg is injured and he limps when he runs, and the output of high-pressure oil becomes stronger and weaker.At this time, professional pressure detection tools are like a doctor's stethoscope, which can accurately find out the problem of the hydraulic pump. It is time to repair or change it. It is never vague.
Moreover, hydraulic oil is the “blood” in the hydraulic system. If it is contaminated and mixed with impurities, it is like a blood clot is blocked in a blood vessel, and the valve core is stuck to death, and the pressure regulation can only be “stunned.”There is also the oil temperature, which is too high or too low. The oil thins when it is hot, thickens when it is cold, and it is sticky. How can the pressure transfer be accurately in place?Therefore, to “change blood” and control temperature of hydraulic oil regularly is to give the system peace of mind.
As for the hydraulic valve, it can be called the traffic commander in the system. Once the reversing valve and relief valve get stuck, the spring loses elasticity, and the flow of oil becomes a mess, and the pressure naturally gets out of control, like a headless fly hitting everywhere.Regularly give these valves a "maintenance massage”, change the valve core, spring or something, so that they can be controlled.
2. The screw barrel “sings against the tune”
The work of the screw in the barrel is like a relay race, to smoothly send the plastic particles into the “final circle”-the mold.If the screw is severely worn out and the thread is incomplete, the plastic particles moving forward is like running on a pothole-filled road, stuck for a while, sprinting for a while, can the pressure of ejecting glue just “jump up and down”?Therefore, it is necessary to take a regular look at the screw, measure the thread depth, and find that it is not correct to change the guard in time.
The barrel is not worry-free, the inner wall is worn and corroded, and the “friction relationship” between the plastic and it becomes love and hate, and the material is blocked from moving forward.In addition, the heating and cooling system has dropped the chain, the temperature is uneven, and the plasticization of the plastic is messy, so it is strange that the injection pressure can be stable.Hurry up and “heal" the barrel, so that the heating and cooling system can operate normally, so that the material can run happily.
3. Electrical control “chaotic command”
The proportional valve driver that controls the pressure of the glue injection is like a band conductor. If it fails, the signal transmission error is full of errors, just like a baton swinging randomly. The instructions received by the proportional valve are all garbled, and the pressure regulation is naturally impossible to talk about.At this time, tools such as multimeters come in handy. Carefully investigate along the line, repair damaged wires, tighten loose joints, and get signal transmission back on track.
There is also the pressure sensor, which is supposed to be an accurate “pressure referee”. If it fails, the pressure value fed back is all false information, and the control system will be misled and make wrong decisions, causing the pressure to rise and fall.Regular calibration and maintenance of the pressure sensor so that it can report the pressure truthfully is a key part of stabilizing the injection pressure.
The unstable pressure of the injection molding machine when shooting glue may seem tricky, but in fact, as long as you follow the trail, find the “cause” of the hydraulic, screw barrel, and electrical control links, and take the right medicine, the pressure can return to stability, and the quality of plastic products can be as stable as Mount Tai.
On the stage of injection molding production, the injection molding machine is the protagonist, and the stability of the injection pressure is the key element to ensure the wonderful performance.When the pressure is “convulsed” when the glue is shot, the quality of plastic products will fluctuate like a roller coaster.Which “behind-the-scenes” are making trouble?And listen to the decomposition.
1. The hydraulic power source “loses its temper”
As the power heart of the hydraulic system, the hydraulic pump, if it is “sick”, the entire injection pressure will follow the “pendulum”.Imagine that the plunger and blade in the pump are worn out excessively, just like an athlete's leg is injured and he limps when he runs, and the output of high-pressure oil becomes stronger and weaker.At this time, professional pressure detection tools are like a doctor's stethoscope, which can accurately find out the problem of the hydraulic pump. It is time to repair or change it. It is never vague.
Moreover, hydraulic oil is the “blood” in the hydraulic system. If it is contaminated and mixed with impurities, it is like a blood clot is blocked in a blood vessel, and the valve core is stuck to death, and the pressure regulation can only be “stunned.”There is also the oil temperature, which is too high or too low. The oil thins when it is hot, thickens when it is cold, and it is sticky. How can the pressure transfer be accurately in place?Therefore, to “change blood” and control temperature of hydraulic oil regularly is to give the system peace of mind.
As for the hydraulic valve, it can be called the traffic commander in the system. Once the reversing valve and relief valve get stuck, the spring loses elasticity, and the flow of oil becomes a mess, and the pressure naturally gets out of control, like a headless fly hitting everywhere.Regularly give these valves a "maintenance massage”, change the valve core, spring or something, so that they can be controlled.
2. The screw barrel “sings against the tune”
The work of the screw in the barrel is like a relay race, to smoothly send the plastic particles into the “final circle”-the mold.If the screw is severely worn out and the thread is incomplete, the plastic particles moving forward is like running on a pothole-filled road, stuck for a while, sprinting for a while, can the pressure of ejecting glue just “jump up and down”?Therefore, it is necessary to take a regular look at the screw, measure the thread depth, and find that it is not correct to change the guard in time.
The barrel is not worry-free, the inner wall is worn and corroded, and the “friction relationship” between the plastic and it becomes love and hate, and the material is blocked from moving forward.In addition, the heating and cooling system has dropped the chain, the temperature is uneven, and the plasticization of the plastic is messy, so it is strange that the injection pressure can be stable.Hurry up and “heal" the barrel, so that the heating and cooling system can operate normally, so that the material can run happily.
3. Electrical control “chaotic command”
The proportional valve driver that controls the pressure of the glue injection is like a band conductor. If it fails, the signal transmission error is full of errors, just like a baton swinging randomly. The instructions received by the proportional valve are all garbled, and the pressure regulation is naturally impossible to talk about.At this time, tools such as multimeters come in handy. Carefully investigate along the line, repair damaged wires, tighten loose joints, and get signal transmission back on track.
There is also the pressure sensor, which is supposed to be an accurate “pressure referee”. If it fails, the pressure value fed back is all false information, and the control system will be misled and make wrong decisions, causing the pressure to rise and fall.Regular calibration and maintenance of the pressure sensor so that it can report the pressure truthfully is a key part of stabilizing the injection pressure.
The unstable pressure of the injection molding machine when shooting glue may seem tricky, but in fact, as long as you follow the trail, find the “cause” of the hydraulic, screw barrel, and electrical control links, and take the right medicine, the pressure can return to stability, and the quality of plastic products can be as stable as Mount Tai.
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