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Calculation of tube blank width for tube making by used roll forming machine
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【概要描述】The calculation of the width of the tube blank of the used roll forming machine is based on the allowance of the welded pipe, the allowance of sizing and the allowance of forming.
Calculation of tube blank width for tube making by used roll forming machine
【概要描述】The calculation of the width of the tube blank of the used roll forming machine is based on the allowance of the welded pipe, the allowance of sizing and the allowance of forming.
- Sort：Information
- Auth:
- Source:
- Release time：2023-04-27 11:30
- Pvs：
Detail
The calculation of the width of the tube blank of the used roll forming machine is based on the allowance of the welded pipe, the allowance of sizing and the allowance of forming.
Welding allowance
The welded tube blank is formed into a cylinder and then enters the induction coil. Due to the skin effect and proximity effect of the current, the edge of the tube blank is heated to a semi-melted or molten state. Under the pressure of the squeeze roller, the molten metal at the two edges crystallizes together. to achieve the purpose of welding.
In order to weld firmly, during the extrusion process, a small amount of molten metal is squeezed out of the weld to form burrs attached to the upper and lower sides of the weld.
If the negligible factor in engineering, the oxidation of the edge of the tube blank during the welding process is excluded, the amount of extruded metal can be regarded as the welding allowance.
Sizing allowance
After welding into a tube, the roundness and diameter of the steel pipe are different from the standard requirements, and the diameter reduction and rounding process must be carried out to make the outer diameter of the steel pipe meet the standard requirements. Therefore, it is necessary to leave a certain reduction and finishing allowance on the width of the strip, that is, the sizing allowance.
Forming allowance
During the forming process of the steel pipe, the outer wall of the pipe blank has been strictly limited in a certain shape of the roll groove. The inner wall of the tube blank is less and less restricted as the edge of the tube blank rises, and it is not restricted after it is rolled into a cylindrical shape. In the process of completing the inward bending deformation of the tube blank under this condition, there is a slight thickening phenomenon, thus making the tube blank narrow. In order to offset the narrowing of the tube blank due to the thickening, it is necessary to add a certain allowance to the width of the strip, that is, the forming allowance.
The tube blank is constantly stretched throughout the forming process of the used roll forming machine, which also narrows the strip. Under normal conditions, the stretch will not exceed the elastic limit of the steel. This can be proved from the obvious yield point in the elongation test of the low carbon steel finished pipe. Therefore, the amount of narrowing caused by stretching will basically disappear as the tube blank is rolled into a cylinder. Therefore, this factor can be ignored when considering the forming allowance.
By measuring the thickness of the welded pipe blank and the wall thickness of the finished pipe, it is easy to obtain the wall thickness increase during the production of the welded pipe.
The increase in the thickness of the finished tube compared to the blank tube is not solely caused by the forming process. The reducing and finishing process of the sizing process will cause a slight thickening of the pipe wall while drawing the steel pipe to elongate it. Therefore, the increase in the wall thickness of the finished pipe is the sum of the increase in the wall thickness during the forming process and the increase in the wall thickness during the sizing process.
The empirical formulas commonly used by manufacturers in calculating the width of blanks are as follows. However, the selection range of the relevant coefficients in these formulas is large, and the calculation is more complicated.
At present, the commonly used empirical formulas for calculating the width of blanks mainly include the following:
Formula 1: Blank width = π (finished tube outer diameter + sizing allowance - blank thickness) + welding and forming allowance coefficient × blank thickness
In the formula, the sizing allowance is taken as a coefficient of 0.7~1.5mm.
The welding and forming allowance coefficient is 0.5~2.5mm. The thinner the tube wall, the larger the diameter and the lower the carbon content, the larger the value. Or determined according to production experience.
This formula is applicable to welded pipes whose outer diameter is less than or equal to 114mm.
Formula 2: Blank width = π (finished tube outer diameter - blank thickness) + forming allowance + welding allowance + sizing allowance
This formula applies to the circular deformation method.
The values of forming allowance, welding allowance and sizing allowance are shown in the table below.
Formula 3: Blank width = (Finished tube outer diameter - Blank thickness) × 1.046~1.05
The selection of the range of 1.046~1.05 in the formula needs to be determined according to production experience. When the outer diameter of the finished pipe is greater than 40mm, the coefficient is 1.04~1.045; when the outer diameter of the finished pipe is smaller or equal to 40mm, the coefficient is 1.046~1.05. This formula applies to thin-walled tubes.
Two empirical formulas with simple calculation methods and reliable results are recommended here.
Formula 1: Blank width = π (finished tube outer diameter - blank thickness) + 3mm
The scope of application of this formula: straight seam welded pipes with a thickness between 0.7 and 2 and an outer diameter below φ50.
In the formula, π (the outer diameter of the finished pipe - the thickness of the billet) refers to the width of the theoretical non-deformation layer during the forming process of the steel pipe. This is a necessary basic dimension in the calculation of the blank width of the straight seam welded pipe. The constant 3mm refers to the sum of the required allowance for the steel pipe in the process of forming, welding and sizing.
Formula 2: Blank width = π (finished tube outer diameter - tube blank thickness) + (0.438 tube blank thickness) + (0.035 finished tube outer diameter) + 2.07
This formula has no restrictions on the use of used roll forming machine.
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Used pipe welding machines refer to welding equipment that has been previously used and is resold, typically for producing welded steel pipes. In used pipe welding machines, the roller conveyor motor is a critical component whose role runs through the entire production process, directly affecting the equipment's operational efficiency, processing accuracy, and product quality. Below is an analysis of the main functions and importance of roller conveyor motors in used pipe welding machines.
1. Transporting Pipe Materials
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6. Energy Saving and Efficiency
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7. Reducing Equipment Wear
The smooth operation of the roller conveyor motor can reduce wear on other components of the equipment. For instance, if the motor operates unstably, it may cause premature wear on rollers, bearings, and other parts, increasing maintenance costs. Thus, in used pipe welding machines, the condition of the roller conveyor motor directly impacts the equipment's service life.
8. Automation Control
In modern pipe welding production lines, roller conveyor motors are often integrated with PLCs (Programmable Logic Controllers) and sensors to achieve automated control. In used pipe welding machines, if the roller conveyor motor supports automation functions, it can significantly improve production efficiency and product quality.
9. Safety
The stable operation of the roller conveyor motor is also closely related to production safety. If the motor fails, it may lead to material pile-ups, equipment jams, or even injuries. Therefore, in used pipe welding machines, the safety of the roller conveyor motor cannot be overlooked.
10. Maintenance and Care
In used pipe welding machines, the maintenance of the roller conveyor motor is particularly important. Since the equipment has been used for a certain period, the motor's performance may have declined. Regularly checking the motor's insulation, lubrication, and operating temperature can extend its service life and ensure stable equipment operation.
Conclusion
The roller conveyor motor plays a vital role in used pipe welding machines, with its functions covering material transportation, speed control, processing accuracy, energy efficiency, and more. For used equipment, the condition of the roller conveyor motor directly affects the overall performance and production efficiency of the equipment. Therefore,
Used pipe welding machines refer to welding equipment that has been previously used and is resold, typically for producing welded steel pipes. In used pipe welding machines, the roller conveyor motor is a critical component whose role runs through the entire production process, directly affecting the equipment's operational efficiency, processing accuracy, and product quality. Below is an analysis of the main functions and importance of roller conveyor motors in used pipe welding machines.
1. Transporting Pipe Materials
The primary function of the roller conveyor motor is to drive the rollers, transporting pipe materials from one process to the next. During pipe welding production, the pipe material needs to go through multiple stages, including uncoiling, forming, welding, cooling, sizing, and cutting. The roller conveyor motor ensures smooth and continuous movement of the pipe material by controlling the rotation of the rollers, preventing jams or deviations.
2. Ensuring Production Continuity
In used pipe welding machines, the stable operation of the roller conveyor motor is key to ensuring production continuity. If the motor fails, it may cause interruptions in material transportation, affecting the efficiency of the entire production line. Therefore, the reliability and durability of the roller conveyor motor are particularly important, especially in used equipment, where regular maintenance and care are essential.
3. Controlling Pipe Material Speed
The roller conveyor motor controls the speed of the rollers through a speed regulation device, thereby adjusting the transportation speed of the pipe material. During the welding process, the transportation speed of the pipe material must match the welding speed to ensure weld quality. The precise control capability of the roller conveyor motor directly affects welding results and production efficiency.
4. Improving Processing Accuracy
The smooth operation of the roller conveyor motor helps reduce vibrations and deviations during material transportation, thereby improving processing accuracy. In used pipe welding machines, the performance of the roller conveyor motor may decline due to equipment aging, so regular inspection and maintenance are necessary to ensure its operational precision.
5. Adapting to Multiple Specifications
Roller conveyor motors are typically equipped with speed regulation functions, allowing them to adapt to the production of pipes with different specifications. For example, when producing thin-walled and thick-walled pipes, the motor needs to adjust its speed to meet different processing requirements. This flexibility enables used pipe welding machines to fulfill diverse production needs.
6. Energy Saving and Efficiency
Modern roller conveyor motors are often designed for high efficiency and energy savings, reducing energy consumption and improving production efficiency. In used pipe welding machines, if the motor is aging or its performance declines, energy consumption may increase. Therefore, it is recommended to upgrade or replace the motor to enhance the overall energy efficiency of the equipment.
7. Reducing Equipment Wear
The smooth operation of the roller conveyor motor can reduce wear on other components of the equipment. For instance, if the motor operates unstably, it may cause premature wear on rollers, bearings, and other parts, increasing maintenance costs. Thus, in used pipe welding machines, the condition of the roller conveyor motor directly impacts the equipment's service life.
8. Automation Control
In modern pipe welding production lines, roller conveyor motors are often integrated with PLCs (Programmable Logic Controllers) and sensors to achieve automated control. In used pipe welding machines, if the roller conveyor motor supports automation functions, it can significantly improve production efficiency and product quality.
9. Safety
The stable operation of the roller conveyor motor is also closely related to production safety. If the motor fails, it may lead to material pile-ups, equipment jams, or even injuries. Therefore, in used pipe welding machines, the safety of the roller conveyor motor cannot be overlooked.
10. Maintenance and Care
In used pipe welding machines, the maintenance of the roller conveyor motor is particularly important. Since the equipment has been used for a certain period, the motor's performance may have declined. Regularly checking the motor's insulation, lubrication, and operating temperature can extend its service life and ensure stable equipment operation.
Conclusion
The roller conveyor motor plays a vital role in used pipe welding machines, with its functions covering material transportation, speed control, processing accuracy, energy efficiency, and more. For used equipment, the condition of the roller conveyor motor directly affects the overall performance and production efficiency of the equipment. Therefore,
In the production process of used welded pipe machines, the expanding machine is a crucial piece of equipment
Time of issue : 2025-03-04
1. Diameter Adjustment
After the welding of steel pipes is completed, due to thermal and mechanical stresses during the welding process, the diameter of the pipes may become uneven or fail to meet standards. The expanding machine adjusts the diameter of the pipes through mechanical or hydraulic means, ensuring it meets design specifications. This process not only improves the dimensional accuracy of the pipes but also ensures their interchangeability and compatibility in use.
2. Shape Correction
During the welding process, steel pipes may develop defects such as ovality, bending, or other shape irregularities. The expanding machine corrects these defects by applying uniform pressure, making the cross-section of the pipes more circular and thereby enhancing their overall quality and appearance.
3. Improvement of Mechanical Properties
During the expanding process, the inner and outer surfaces of the pipes are subjected to uniform stress, which helps eliminate residual stresses generated during welding and improves the mechanical properties of the pipes. For example, expanding can enhance the compressive and bending strength of the pipes, making them more suitable for use in high-stress environments.
4. Surface Quality Enhancement
The expanding machine can also polish the inner and outer surfaces of the pipes to some extent during the expanding process, removing burrs and oxide scales generated during welding. This improves the surface quality of the pipes, which is particularly important for applications requiring high surface quality, such as fluid or gas transportation.
5. Increased Production Efficiency
In the production line of used welded pipe machines, the use of an expanding machine can significantly improve production efficiency. Through automated or semi-automated expanding operations, manual intervention is reduced, production cycles are shortened, and production costs are lowered. Additionally, the high-precision operation of the expanding machine reduces the scrap rate, enhancing the overall efficiency of the production line.
6. Adaptability to Multiple Specifications
Expanding machines typically feature adjustable expanding ranges and pressure settings, allowing them to accommodate the production of pipes with different diameters and wall thicknesses. This flexibility enables used welded pipe machines to produce pipes of various specifications, meeting the diverse needs of customers.
7. Extended Equipment Lifespan
In used welded pipe machines, the use of an expanding machine can also extend the lifespan of other equipment. By correcting the shape and dimensions of the pipes, wear and damage to subsequent processing equipment are reduced, thereby prolonging the lifespan of the entire production line.
8. Environmental Protection and Energy Efficiency
Modern expanding machines often incorporate energy-saving designs and eco-friendly materials, reducing energy consumption and environmental pollution. In the production process of used welded pipe machines, the use of high-efficiency expanding machines not only lowers production costs but also aligns with the environmental requirements of modern industry.
Conclusion
The role of the expanding machine in used welded pipe machines cannot be overlooked. It not only improves the dimensional accuracy and shape quality of steel pipes but also enhances their mechanical properties, improves surface quality, boosts production efficiency, adapts to multiple specifications, extends equipment lifespan, and meets environmental and energy-saving requirements. Therefore, the expanding machine is an indispensable key piece of equipment in the production process of used welded pipe machines.
From the above analysis, it is clear that the expanding machine plays multiple roles and holds significant importance in used welded pipe machines. Whether from the perspective of product quality, production efficiency, or economic benefits, the expanding machine is a critical component.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier：www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier（Please click the link→) :second-hand pipe mill
1. Diameter Adjustment
After the welding of steel pipes is completed, due to thermal and mechanical stresses during the welding process, the diameter of the pipes may become uneven or fail to meet standards. The expanding machine adjusts the diameter of the pipes through mechanical or hydraulic means, ensuring it meets design specifications. This process not only improves the dimensional accuracy of the pipes but also ensures their interchangeability and compatibility in use.
2. Shape Correction
During the welding process, steel pipes may develop defects such as ovality, bending, or other shape irregularities. The expanding machine corrects these defects by applying uniform pressure, making the cross-section of the pipes more circular and thereby enhancing their overall quality and appearance.
3. Improvement of Mechanical Properties
During the expanding process, the inner and outer surfaces of the pipes are subjected to uniform stress, which helps eliminate residual stresses generated during welding and improves the mechanical properties of the pipes. For example, expanding can enhance the compressive and bending strength of the pipes, making them more suitable for use in high-stress environments.
4. Surface Quality Enhancement
The expanding machine can also polish the inner and outer surfaces of the pipes to some extent during the expanding process, removing burrs and oxide scales generated during welding. This improves the surface quality of the pipes, which is particularly important for applications requiring high surface quality, such as fluid or gas transportation.
5. Increased Production Efficiency
In the production line of used welded pipe machines, the use of an expanding machine can significantly improve production efficiency. Through automated or semi-automated expanding operations, manual intervention is reduced, production cycles are shortened, and production costs are lowered. Additionally, the high-precision operation of the expanding machine reduces the scrap rate, enhancing the overall efficiency of the production line.
6. Adaptability to Multiple Specifications
Expanding machines typically feature adjustable expanding ranges and pressure settings, allowing them to accommodate the production of pipes with different diameters and wall thicknesses. This flexibility enables used welded pipe machines to produce pipes of various specifications, meeting the diverse needs of customers.
7. Extended Equipment Lifespan
In used welded pipe machines, the use of an expanding machine can also extend the lifespan of other equipment. By correcting the shape and dimensions of the pipes, wear and damage to subsequent processing equipment are reduced, thereby prolonging the lifespan of the entire production line.
8. Environmental Protection and Energy Efficiency
Modern expanding machines often incorporate energy-saving designs and eco-friendly materials, reducing energy consumption and environmental pollution. In the production process of used welded pipe machines, the use of high-efficiency expanding machines not only lowers production costs but also aligns with the environmental requirements of modern industry.
Conclusion
The role of the expanding machine in used welded pipe machines cannot be overlooked. It not only improves the dimensional accuracy and shape quality of steel pipes but also enhances their mechanical properties, improves surface quality, boosts production efficiency, adapts to multiple specifications, extends equipment lifespan, and meets environmental and energy-saving requirements. Therefore, the expanding machine is an indispensable key piece of equipment in the production process of used welded pipe machines.
From the above analysis, it is clear that the expanding machine plays multiple roles and holds significant importance in used welded pipe machines. Whether from the perspective of product quality, production efficiency, or economic benefits, the expanding machine is a critical component.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier：www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier（Please click the link→) :second-hand pipe mill
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Wechat: 13392281699
Email: zty@usedpipemill.com
Company address:No. A99, East Lecong Avenue, Lecong Town, Foshan City, Guangdong Province
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