Is there a correlation between the low pressure of the injection molding machine and the circuit?

P is the power supply of the pressure valve, F is the power supply of the flow valve, these two valves plus a valve seat is the proportional valve, the ammeter of pressure and flow rate is doing different actions into the change between (because the pressure speed is adjusted to the greater the current, up to 140 pressure for the current)), if your machine is relatively early, you can test the machine in this way, the seat retreats in place, the seat retreat pressure is adjusted to 70 speed 70 to see the pressure gauge, has been holding down the seat retreat, the pressure is not 70, what position is the ammeter; Then adjust the pressure to 140 to see if the pressure gauge is 140 and whether the ammeter is in position.

If the current is not reached, the computer board is broken, and the pressure is not reached, the proportional valve and oil pump are broken.

I don't know if you have disassembled and washed the proportional valve, if you have disassembled and washed, the probability of failure is 80%.

Does the computer have a current output for proportional pressure and proportional flow? If not, there is a problem with the circuit! If there is, there is a problem with the oil circuit! The low pressure of the injection molding machine is related to the circuit!

It is recommended to contact the manufacturer's technical staff first. The operation of the equipment includes mechanical, electronic, control and other problems, if you give you an answer, I am afraid it is not very appropriate.

But there are some experiences that can be exchanged, remember - check back level by level. First of all, confirm whether the pressure of the main oil circuit is normal and whether the oil pressure sensor is abnormal; Then confirm whether each solenoid valve is working properly, which includes not only cleaning, but also whether the sealing ring inside is broken, whether the solenoid valve spool is stuck, whether the coil is damaged, whether the wire between the coil and the controller is damaged, ,..

Generally speaking, it is only related to the hydraulic system.

Of course it matters, the standard voltage is 24V

There is a screw on the top of the total oil system, tighten it a little to adjust the pressure and speed, some of the total oil of the injection molding machine is made on the motor oil air pump, some are in the head, the proportional valve is generally on the circuit board, if it is a CNC machine, it has a piece with four proportional valves, the first is the total proportional valve, take a small screwdriver to the right and slowly adjust, adjust too much machine vibration, I hope to help you.

1. There should be an ideal variable speed process in setting the injection molding parameters and setting the opening and clamping strokes and the mold protection pressure to ensure the safe operation of the mold.

2. First set the low-pressure protection pressure to 0, then set the injection molding machine to low-pressure manual, repeatedly close the mold to see the position (actual position) required for the low pressure of the mold, and increase 1% each time with the minimum low-pressure pressure, until the low-pressure clamping to the high pressure, the low-pressure protection pressure we want to set.

3. If the clamping force capacity is 15, if the spring mold cannot be completely closed, or you want to reduce the mold contact time, you can adjust the mold low pressure protection pressure in the range of + -10%. In the setting of the clamping stroke and mold protection pressure, it is necessary to wait for the set mold temperature to reach the set value, and the accurate low-voltage protection setting can be adjusted, because it is better to adjust the mold when the mold temperature reaches the set value, and the hot expansion and clamping of the mold cannot be carried out. After setting, the A4 paper (40*40mm) of A4 paper should be moistened with butter and pasted on the safe parting surface of the mold, and then the mold should be closed to check the low-voltage protection effect.

If the machine will alarm after clamping, it will be OK, otherwise the low-voltage protection parameters will be reset until OK, and it will be.

The pressure of the injection molding machine is sometimes large and sometimes small, what is the problem with the unstable pressure?

Pro, there may be a variety of reasons for the unstable pressure of the injection molding machine, which needs to be analyzed on a case-by-case basis, and the following are the possible reasons: 1Hydraulic system failure:

Hydraulic oil pumps, cylinders, tubing, etc., can all have problems, resulting in unstable pressure. 2.Throttle valve failure:

The throttle valve regulates the flow rate, and if the throttle valve fails and the flow rate is unstable, it is known that the rent blind will lead to unstable pressure. 3.Pressure sensor failure:

Pressure sensors are an important component in measuring pressure, and if they fail, they can lead to pressure instability. 4.Mold Issues:

If there is blockage or wear in the passages, nozzles, and other parts of the mold, it will also lead to unstable mold pressure. 5.Temperature issues:

The temperature control of the injection molding machine also affects the pressure, and if the temperature is unstable, it will lead to pressure instability. The above are some of the reasons that may lead to the instability of the pressure of the injection molding machine, which need to be investigated according to the specific situation.

Injection molding expert Yang Jianhong will answer for you:

The system pressure of the hydraulic press can reach more than 30MPa, but the safe output pressure is generally 14MPa or 18MPa, which is the system oil pressure, the pressure on the screw head should be multiplied by the booster coefficient, the general machine is about 8 15, the pressurization coefficient of the same tonnage fine screw is large, and vice versa, if you take 10, it is 140MPa, but the general holding pressure will not be so high, for example, with 80MPa, the highest pressure in the mold cavity is 80MPa, and the residual stress is about 15MPa, which can be basically understood in this way.

150 kg on the machine i.e. 15MPa is the system pressure, and the textbook 50 80pa is the pressure of the screw head, and there are no major problems.

Because the process conditions of each product are different, the injection molding pressure of each product is different. In the production process, the actual pressure at the top of the screw is generally not calculated, but the pressure at the end face of the screw should still be understood. Can be roughly calculated:

1. Read the maximum value on the pressure gauge during the injection process, multiply by the sum of the areas of the two injection cylinders to get the total pressure of the injection. This total pressure is equal to the total pressure at the tip of the screw. 2. The total pressure of the injection divided by the area of the screw is equal to the pressure of the end face of the screw.

Generally speaking, the injection molding process includes four processes: filling, compression, pressure holding, and cooling. When the injection molding machine is adjusted, it will generally turn to the holding pressure when the injection molding product is just 95% to 99%, which is the basic principle of determining the holding pressure position.

In the packing stage, the main function of packing is to continue to give a pressure to the melt in the cavity to prevent the melt from backflowing, and at the same time to make up the shrinkage as the melt cools and shrinks until the gate is closed. If the holding position is not set well, various problems will occur in the product. For example, if the holding position is set too forward, the product is not filled to 99% before the pressure is turned to the holding pressure, and the holding pressure and holding speed are set relatively low, and the screw can no longer move forward, and the product will have defects such as lack of glue, small size, shrinkage, and deformation.

If the holding position is set too far, that is, the product has been fully glued, but has not yet reached the holding position, it is equivalent to the holding pressure is not used, and the injection molding machine has carried out the pressure holding action with the injection pressure. In general, in order to overcome the resistance of glue filling, the injection pressure and speed will be set to be larger, which will lead to the occurrence of fronts and overfilling of the product.

The filling process mainly affects the appearance quality of the product, and the pressure holding mainly affects the internal quality of the product. Therefore, the setting of the packing pressure is very important. Of course, the setting of pressure holding, position, pressure, speed and time are organically integrated, and they cannot be separated from each other.

The holding position can avoid bubbles, water streaks, shrinkage, and lack of glue! Of course, it takes the right amount of pressure, speed and time.

Summary. The speed of the pressure holding action during injection molding is to ensure that the pressure remains unchanged, and the pressure is maintained for a certain period of time according to the set pressure.

The speed of the pressure holding action during injection molding is to ensure that the pressure remains unchanged, and the pressure is maintained for a certain period of time according to the set pressure.

The speed of the pressure holding action during injection molding, the role is to ensure that the pressure remains unchanged, according to the set pressure to maintain a certain amount of time, just imagine, if there is no speed, the screw leaks backward glue, there will be no pressure immediately, there will be no pressure, there is no pressure, really help you look forward to it, the speed of the pressure holding action during injection molding, the effect is to ensure that the pressure remains unchanged, according to the set pressure to maintain a certain time, just imagine, if there is no speed, the screw leaks backward glue, there will be no pressure immediately, there will be no pressure, really help you look forward to,

Hello! In the injection molding process, the melt shrinks due to cooling, but because the screw continues to move forward slowly, the melt in the barrel continues to be injected into the cavity to supplement the need for product shrinkage, which is called pressure holding. To put it bluntly, it is to prevent the shrinkage of the product, and the production of the product is relatively stable if the pressure is maintained.

Packing can also adjust the size of the product without weld lines, dents, flashes and warping. In fact, both pressure holding and injection mean the same thing, that is, push the screw forward with force, but in the injection process, the injection speed is set and the maximum injection pressure is the upper limit of the push, and in the pressure holding process, the injection pressure is set and the maximum pressure holding speed is the upper limit of the push.

Summary. When the injection molding machine is pressurized, the raw material will be subjected to greater pressure and temperature after being injected into the mold, so that the distance between the raw material molecules will be reduced, and the molecular arrangement will be more compact, so that the size will become larger. In addition, the pressurization of the injection molding machine can also make the plastic material better fill the voids in the mold, so as to ensure the accurate size of the molded product.

What is the principle of the injection molding machine plus pressure holding, and the size will be large.

What is the principle of injection molding machine plus pressure and size will be large?

What is the principle of the injection molding machine plus pressure holding, and the size will be large.

When the injection molding machine is pressurized, the raw material will be subjected to greater pressure and temperature after being injected into the mold, which will reduce the distance between the molecules of the raw material and make the molecular arrangement more compact, thus making the size larger. In addition, the pressure of the injection molding machine can also make the plastic material better fill the gaps in the missing mold, so as to ensure the accurate size of the molded product.

1. Holding time setting: Holding time is the gate condensing time. Take two molds of products each time, and then weigh (excluding the material head), the holding time is the time when the weight of the product begins to stabilize, each time. Holding time: The time when the weight is stable in seconds.

2. Pressure and time distribution in different processes of injection molding machine:

1) Mold feeding process: low pressure and short time.

2) Mold closing process: the left and right molds are connected until they are completely closed, the pressure is slightly higher, and the time is not long.

3) Pressure holding process: feeding to the mold cavity until molding, curing. The pressure is high and the time is long, accounting for about 40-60 of the manufacturing time of a product.

4) Demold removal process: processing and forming, opening the mold, demoulding, and taking out the processed parts. The pressure is slightly higher and not for long.

5) Mold return process: the processed parts are taken out, the mold is set back to its original position, and after the auxiliary work is carried out, it is to be processed again. Low pressure and short time.

For the same injection molding machine, the pressure (p) and time (t) of different plastic parts are different. Due to the complexity of the mold of the machined part, the use of different plastics, the total amount of material used in a machined piece, whether there are inserts, etc.

Gotta give me points, haha! The pressure is pumped out by the oil pump, and then the pressure proportional valve is passed through the pressure proportional valve to control the pressure. Why isn't it fast when it's stressful?

It's that its speed (traffic) is small or slow. It's like a piston, this end is pressurized, and the other end doesn't move without anything coming out. If you want to be fast or slow, you need to adjust it at the outlet of the outlet.

Got it?

Reduce the speed. Increased stress. Isn't it adjustable.