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Pipe bending machines have been widely used in many occupations, and each professional pipeline has its own characteristics, such as: the aerospace field bending machine generally requires high precision, high flexibility; ship manufacturing elbow The machine requires particularly high output torque and ease of loading and unloading of large-size pipe fittings; the automotive industry requires a particularly high production cycle and reliability and durability.

Before transporting, hoisting and moving, the pipe bender must confirm the type, dimensions and total weight of the machine in advance, and then select the wire rope for the weight of the machine, the buckle for the hanging pipe bender, and choose to accept the weight of the machine. Lifting equipment and moving equipment.

When carrying out type tests on new products and updated products, overload tests should be carried out. The overload test is carried out by a fully automatic pipe bending machine with a maximum rotating torque of 110% bent pipe fittings (bending point of view 180°). The sampling test for batch production is allowed to be tested according to 10% of the output of each batch, but not less than one.

Bending pipes are important parts commonly used in industrial boundaries. Generally, pipe bending machines are used for twists and turns. The pipe bending machine can be roughly divided into a CNC pipe bending machine, a hydraulic pipe bending machine and the like. It is mainly used for electric power construction, public railway construction, pipeline installation and repair of steam boilers, bridges, boats, furniture, decoration, etc. It has the advantages of many functions, correct structure and simple operation. So how do the tube bender perform the load test? Please follow three ways:

1. Each fully automatic pipe bending machine shall be subjected to full load test, and the pipe fittings shall be bent twice according to its large rolling torque (torsional viewing point 180°).

2. During the full load test, the automatic pipe bending machine should be stable and reliable and comply with relevant regulations.

3. For the type test of new products and new products, the overload test should be carried out. The overload test is carried out according to the automatic pipe bending machine, and the pipe fittings with a large rolling torque of 110% are bent three times (the zigzag point of view is 180°). The allowable sampling test for batch-type manufacturing shall be tested at 10% of the output of each batch, but not less than one.

The above content will be introduced here first, we will meet again next time, and wish the world a happy life.

First, the use of bending machine molds in the production of power generation equipment

Under the circumstances that global energy supply is becoming more serious day by day and oil prices continue to rise, the demand for power generation equipment has become more and more significant. In the production process of power generation equipment, the cost of only the mold part of the CNC pipe bending machine is very considerable.

Second, the use of bending machine mold in mold making operations

In the process of making the bending machine mold, the numerical control bending machine mold is required in almost all the steps of forming mold, hot working mold, cold working mold and plastic mold. In addition, automobiles, high-speed trains, general machinery operations, and wood processing industries that have gradually expanded their usage in recent years have become the main users of the CNC tube bending machine mold profession.

Third, the use of pipe bending machine mold in the aerospace industry

In this profession, CNC pipe bender molds are typically used to cut aircraft structural components. These structural members are generally bulky, and a large number of aluminum alloys have been used in the past. Following the expansion of the use of titanium alloys and composite materials, the requirements for mold processing of CNC tube bending machines are also increasing.

The installation of the pipe bending machine mold is an extremely important task. Mold installers need to have the expertise to operate the cnc fully automatic tube bending machine and properly adjust the bend mold, which is important for the quality of the bend. Mold installers must develop the concept of personal safety awareness, and the installation of the mold must be carried out in a safe manner. All mold installers should recognize the importance of safety and the ability to provide a safe operating environment to others when performing their own work. The mold must be suitable for the size of the machine. If the pipe is bent more than the original value, the excessive load of the machine will cause the mechanical properties to fail, and it may damage the personnel in the operation.

1. Do not install, adjust or move the mold without reading or understanding the mold installation instructions on the manual.

2. Do not wear ties, jewelry or loose clothing when working at or near the machine.

3. Do not place any part of your hand, fingers or body in the mold operating area with the oil pump motor activated.

4. If the mold is too heavy to lift by hand, use a suitable mechanical lifting method. A lifting eye should be installed on the mold, and the lifting ring should be used to keep the mold parts stable during the hanging process.

5, the mold should be wiped clean before installation, and remove dust, metal cutting or other foreign dirt. Failure to do so may result in mismatched matching, which may result in personal injury or damage to the machine or mold.

6. The elbow lubricant will make the surrounding area slippery, and the mold area will be carefully treated in the dirty mold area. When the tube is bent, the end of the tube coated with the absorbent coating will be inserted into the safe and practical range of the mold to prevent bending. The pipe lubricant drops on the machine.

7. Do not place any part of your hand, fingers or body in the mold operating area with the oil pump motor activated.

8. When the bender is inoperable or unattended, even for a short period of time, check all switch settings before restarting the machine.

In the use of the pipe bending machine, the problem of deformation of the bend is encountered. What is the cause?

From the process analysis, it can be known that the common bending pipe bending defects are mainly in the following forms: serious flattening at the arc (ellipse), excessive reduction of the outer wall of the arc, excessive bending of the outer arc, round The inside of the arc is wrinkled and bent back. With the different bend radius of the bender, the first four types of defects are different in the way and location, and do not necessarily occur at the same time, but the elastic rebound of the curved workpiece is inevitable.

The presence of bent pipe bend defects has a large negative impact on the quality of the bent pipe fittings. On the one hand, it may cause the cross-sectional area to decrease, thereby increasing the resistance of the fluid flow, and on the other hand, affecting the functional effect of the pipe in the structure; the wrinkling of the inner wall of the pipe not only weakens the strength of the pipe, but also easily causes the velocity of the flowing medium to be uneven. The eddy current and the curved part accumulate dirt, which affects the normal use of the bent pipe; the rebound phenomenon inevitably makes the bending angle of the pipe larger than the predetermined angle, thereby reducing the bending process precision. The thinner wall thickness will inevitably reduce the ability of the pipe to withstand the internal pressure, affecting its performance; the distortion of the cross-section shape of the bent pipe. Therefore, corresponding measures should be taken before the bending to prevent the above defects from being generated to obtain the ideal pipe fittings. Product performance indicators and appearance quality.

Four methods for checking the failure of hydraulic pipe bending machine

1) Understand the operation status of hydraulic system of hydraulic pipe bending machine: whether the hydraulic system of the pipe bending machine is working normally; whether the hydraulic pump has abnormal phenomenon; the time and result of detecting the cleanliness of the hydraulic oil; the cleaning and replacement of the filter element; Whether the hydraulic components have been adjusted; whether the sealing components have been replaced; what abnormalities have occurred in the hydraulic system of the bending machine before and after the failure; in the past, what problems occurred in the system, how to remove them, etc., temperature rise, oscillation, crawling and The tightness of the joint determines whether the working condition of the moving parts of the hydraulic system of the bending machine is normal.

2) Look at the actual operation of the hydraulic system of the hydraulic pipe bending machine, and observe whether there are problems in the system pressure, speed, oil, leakage, oscillation, etc.

3) Listen to the sound of the hydraulic system of the bender, such as: impact sound; pump noise and abnormal sound; determine whether the hydraulic system works normally.

4) Touch the temperature rise, oscillation, crawling and the tightness of the joint to determine whether the working condition of the moving parts of the hydraulic system of the bending machine is normal.

When it comes to pipe bending machines, you may find it strange. However, some elbows are common in our days, and these elbows can be said to be a product under the bender.

Pipe bending machines can be roughly divided into CNC pipe bending machines, hydraulic pipe bending machines and the like. It is mainly used for electric power construction, public railway construction, boiler laying and repairing of boilers, bridges, boats, furniture, decoration, etc. It has many advantages such as multi-function, reasonable structure and simple operation.

There are many types of pipe bending machines. They are divided into bending type, roll bending type, wrap type and kneading type according to the zigzag form. According to whether the heating is in the case of twists and turns, it can be divided into two types: bending type and hot bending type; The difference can be divided into mechanical transmission and hydraulic transmission.

The bending machine has certain dangers in the time of application. Therefore, Xiaobian reminds everyone to pay attention to safety. Today, I will share with you the problems that need to be paid attention to when operating the bending machine.

When the machine is started, keep in mind that the human body must not enter the range of the swivel rotation. When the machine is working, all personnel stop the space that enters the swivel arm and the pipe is swept. The hydraulic system of the machine tool uses YA-N32 general hydraulic oil. Under normal circumstances, it is replaced once a year. It is necessary to clean the oil filter at the same time. When adjusting the mold, the adjuster should adjust the button by himself. Do not adjust it on the machine. The other person operates on the control cabinet. When adjusting the machine or emptying the vehicle, the core rod should be removed. The hydraulic system also needs to pay attention to the magnitude of the pressure during operation.

Others stop the thrust speed of the side push in the manual condition is greater than the line speed of the edge of the rotating mold. After using the machine for a period of time, you should check the tightening degree of the chain and insist that the upper and lower chains are tight together. In the core-torcing mode during automatic operation, it is necessary for the operator to ensure that the core is inside the tube before the bending arm comes back, or to ensure that the mandrel is not blocked when the bending arm comes back, and the core or the core rod is bent or broken. .

The CNC automatic pipe bending machine industry should seize the opportunity of national policy support and huge market space, increase the intensity of skill innovation and talent training, give full play to the market mechanism to complete the self-optimization of the CNC industry, improve the ability of enterprises to serve, and try to shorten the developed countries. The distance between them is to complete the change of CNC automatic pipe bending machine products from low-end to high-end, from primary product processing to high-precision product manufacturing.

The CNC automatic pipe bending machine is mainly composed of three parts: mechanical part, hydraulic system and PLC control system. The mechanical part mainly consists of a pipe clamping device, a bending pipe transmission device, a boosting device, a bed body and a bending pipe mold. The working principle of the elbow: the elbow mold is fixed on the main shaft and rotates with the main shaft. The tube is fixed on the clamping groove of the fan-shaped elbow mold through the clamping mold, and the movable boosting guide material chute is closely attached to the tube blank. The zigzag outside.

The use of automatic pipe bending machine

Safety Practices: Professional pre-job exercises and assessments can prevent accidental injuries that may occur during production or minimize them. Safety practice programs must be supervised by leaders and managers. Managers must be sensitive to safe work in all their operational responsibilities; proper practice is necessary to achieve maximum protection. In general, employees should be instilled with the safety concept of the working environment and machine operation, and the important rules such as mold equipment guidance, safety equipment and operation methods and personal safety should be paid attention to the individual's safety awareness.

Position of the emergency stop button: On the operation panel: Pressing this button will stop all motor and servo power.

Prevent overload: Confirm the load in the machine operation to prevent overload of the machine components, otherwise it will affect the service life of the machine and the safety of the operator. Indiscriminate use of machinery and equipment will cause overload of machine parts. Excessive load may not be deliberate, but it is easy to happen. This is because the torque required to bend the pipe is greater than the torque of the original design of the machine; please be sure to follow these skill standards, otherwise it will cause serious damage to the machine. The biggest twist is the tensile standard 40Kg/cm2 of the twisted iron pipe.

The power supply of the PLC control system of pipe bending machine is one of the main ways for the interference signal to enter the PLC, which is mainly generated by the impedance coupling of the power supply line. The power grid interference into the PLC control system is mainly coupled through the power supply of the PLC system, the power supply of the transmitter, and the power supply of the instrument with direct electrical connection with the PLC system.

Nowadays, the power supply of the PLC system generally uses a power supply with better isolation performance, and the power supply for the transmitter and the instrument power supply with direct electrical connection with the PLC system have not received enough attention. Although certain isolation measures have been taken, they are generally not enough. The main use of the isolation transformers has large distribution parameters, poor interference suppression capability, and common mode interference and differential mode interference through power supply coupling. In addition, the AC magnetic field of cattle produced by various high-power electrical equipment is also the main source of interference, especially the changes inside the power grid, the surge generated by the operation of the gate, the start and stop of large-scale power equipment, and the harmonic caused by the AC-DC transmission. Waves, the impact of the short-circuit transient process of the power grid, etc. will cause serious ten disturbances to the power supply of the PLC connected to the same power grid. In severe cases, the PLC may even crash during operation.

Therefore, for the power supply of the transmitter and the common signal meter, the distributor with small distributed capacitance and suppressed bandwidth (such as multiple isolation, shielding and leakage inductance technology) should be selected to reduce the interference to the PLC control system. In addition, in order to ensure that the power supply of the PLC control system is not interrupted, the online uninterruptible power supply (UPS) can be used to improve the safety and reliability of the power supply. UPS has strong interference isolation performance and is an ideal power supply for PLC control systems. In order to suppress the grid voltage fluctuation and power frequency interference caused by the startup of large-capacity equipment, an isolation transformer and an AC voltage regulator are generally used, and filtering is performed, and all the shielding layers are well grounded. The power grid often contains high harmonic components. When the grid load is large, the grid voltage fluctuations are relatively large. In order to effectively weaken and eliminate the interference signal from the power grid, a high-performance isolated power supply should be selected to suppress the power grid interference.

The CNC automatic pipe bending machine industry should seize the opportunity of national policy support and huge market space, increase the intensity of skill innovation and talent training, give full play to the market mechanism to complete the self-optimization of the CNC industry, improve the ability of enterprises to serve, and try to shorten the developed countries. The distance between them is to complete the change of CNC automatic pipe bending machine products from low-end to high-end, from primary product processing to high-precision product manufacturing.

The CNC automatic pipe bending machine is mainly composed of three parts: mechanical part, hydraulic system and PLC control system. The mechanical part mainly consists of a pipe clamping device, a bending pipe transmission device, a boosting device, a bed body and a bending pipe mold. The working principle of the elbow: the elbow mold is fixed on the main shaft and rotates with the main shaft. The tube is fixed on the clamping groove of the fan-shaped elbow mold through the clamping mold, and the movable boosting guide material chute is closely attached to the tube blank. The zigzag outside.

The use of automatic pipe bending machine

Safety Practices: Professional pre-job exercises and assessments can prevent accidental injuries that may occur during production or minimize them. Safety practice programs must be supervised by leaders and managers. Managers must be sensitive to safe work in all their operational responsibilities; proper practice is necessary to achieve maximum protection. In general, employees should be instilled with the safety concept of the working environment and machine operation, and the important rules such as mold equipment guidance, safety equipment and operation methods and personal safety should be paid attention to the individual's safety awareness.

Position of the emergency stop button: On the operation panel: Pressing this button will stop all motor and servo power.

Prevent overload: Confirm the load in the machine operation to prevent overload of the machine components, otherwise it will affect the service life of the machine and the safety of the operator. Indiscriminate use of machinery and equipment will cause overload of machine parts. Excessive load may not be deliberate, but it is easy to happen. This is because the torque required to bend the pipe is greater than the torque of the original design of the machine; please be sure to follow these skill standards, otherwise it will cause serious damage to the machine. The biggest twist is the tensile standard 40Kg/cm2 of the twisted iron pipe.

1. Causes of motor failure of pipe bending machine

1 When the bender motor is repaired, the stator winding turns are reduced too much;

2 power supply voltage is too high;

3Y connection bender motor motor is incorrectly connected to Δ;

4 In the assembly of the motor of the bender motor, the rotor is reversed, so that the stator core is not aligned, and the effective length is shortened;

5 air gap is too large or uneven;

6 When the old winding is removed, the hot-disassembled method is used improperly to burn the iron core.

2, troubleshooting

1 rewind the stator winding to restore the correct number of turns;

2 try to restore the rated voltage;

3 bender motor is changed to Y;

4 re-assembly;

5 Replace the new rotor or adjust the air gap;

6 Overhaul the core or recalculate the windings and increase the number of turns as appropriate. The Jiejie mechanical pipe bending equipment adopts the domestic advanced Far East motor. The safety and reliability failure rate is extremely low.

The working principle of the hydraulic pipe bending machine is to make the steel pipe plastically deformed by the bending point of the fulcrum and the force point, so as to achieve the cold bending of the steel pipe. The lower die is located at the front of the pipe bending machine and is hung by the hydraulic cylinder. In the floating state on the frame, the steel pipe is introduced into the lower mold from the rear of the bending machine through the clamp and the upper mold by the spreader, and the inner tube is placed in the steel pipe and placed in the center of the upper mold, and the inner tube expansion block is used to hug the inner wall of the steel pipe. So that the steel pipe avoids abnormal deformation during bending.

In marine engineering, standard pipe fittings play an important role in pipeline engineering, but in some special occasions, non-standard pipe fittings are sometimes used. For example, the horizontal pipe of a submarine pipeline, the riser, and the inflection point of some process pipelines on the upper part of the platform, it is usually necessary to bend a large radius elbow to meet the special requirements of the submarine pipeline passing ball, and to reduce the energy loss of the fluid in the pipeline and Erosion of the pipeline.

Unlike the mechanical performance test, the non-destructive inspection of the double-head hydraulic pipe bending machine is a non-invasive inspection of the test object, including various detection methods. Non-destructive testing of elbows usually uses ultrasonic testing and magnetic particle testing. The temperature accuracy is high, and the temperature required for the bending process is a constant value. The accuracy of the measuring tool is very important. In the general enterprise, the portable infrared thermometer is selected for measurement, which cannot be used for real-time monitoring, and because of portable operation. When the human factors are not well controlled, it will bring unimaginable hidden dangers to the quality of the hydraulic pipe bending machine.