As the leading heavy machinery manufacturer in the country, CITIC Heavy Industry Machinery Co., Ltd. supplies a wide range of heavy equipment to clients across the globe. One of the key components in their product line is a massive speed reducer, which features a gear box that has been welded. This enormous gearbox stands at 7.1 meters tall, 7 meters long, and 5.72 meters wide, with a total weight of 320 tons. It holds the title of the world’s largest gearbox for a reducer. The housing is made from S355JR steel, with a thickness of 320mm, making it one of the most robust structures in the industry.
To cut this massive component, the company used its existing special thick plate CNC flame cutting machine. By selecting the right cutting parameters, they successfully completed the task, ensuring precision and quality. The process involved not only advanced technology but also careful planning and execution.
The CNC flame cutting machine used in this operation was manufactured by Messer Cutting & Welding (China) Co., Ltd. It can handle workpieces up to 600mm thick, with a maximum gauge length of 6000mm and a rail length of 20,000mm. Oxygen and propane were used as the gas mixture for the cutting process. This machine is specifically designed for handling thick materials, making it ideal for such a challenging project.
The part being cut was a bearing housing, measuring 320mm × 1310mm × (5790 + 8) mm. The material was S355JR, a low-alloy high-strength steel commonly used in European engineering applications. Its yield strength is 355MPa, equivalent to domestic Q345B steel. The extra 8mm in length was reserved for welding shrinkage, ensuring proper fit during assembly.
Before the actual cutting began, several preparatory steps were taken. First, the steel plate underwent ultrasonic inspection according to EN10160-1999 standards. Internal defects were checked at the S3 level, while edge defects were inspected at E4. Next, the gas pipeline was checked for leaks, as any leakage could lead to waste or even dangerous situations like explosions. Then, the accuracy of the cutting machine was tested by drawing a rectangle on a steel plate and running the cutting torch along the same path. Any deviation was corrected until the machine met the required precision.
Finally, the unevenness of the cutting platform was assessed and adjusted. The distance between support plates was carefully set to ensure full contact with the workpiece, preventing any movement during the cutting process.
During the actual cutting, the team selected optimal parameters after multiple trial cuts. Due to the cold winter conditions, a two-cut method was employed to prevent cracks caused by rapid cooling. The first cut was slightly larger than the final dimensions, allowing for sufficient preheating. To avoid deformation, a “locking†technique was used, which helped keep the workpiece attached to the steel plate during the process. This approach proved highly effective, resulting in a clean and precise cut.
The real-time cutting scene and the “locking†method are illustrated in Figures 4 and 5, respectively. These visual aids provide a clear understanding of the process and the techniques used to achieve successful results.
In conclusion, by utilizing the existing thick plate CNC flame cutting machine and applying appropriate cutting parameters, the company successfully completed the cutting of a 320mm-thick ferrous metal component. This achievement not only demonstrated their technical capabilities but also laid a solid foundation for future projects involving even thicker plates. The experience gained will be invaluable for future large-scale manufacturing tasks.
Types of Truck Winches
There are several types of truck winches, each with its own unique characteristics and advantages. Electric Winches are among the most popular choices. They draw power from the truck's electrical system, typically the 12 - volt battery. Electric winches are known for their ease of installation and operation. With a simple connection to the battery and the appropriate mounting, they can be up and running quickly. They offer a wide range of pulling capacities, from relatively modest amounts suitable for smaller trucks to extremely high - powered models capable of handling heavy - duty trucks and large loads. However, they do rely on the battery's charge, and continuous use can drain the battery, so it's important to ensure the truck's electrical system can handle the load.
Hydraulic winches, on the other hand, harness the power of the truck's hydraulic system, often connected to the power steering pump or a dedicated hydraulic pump. These winches are prized for their ability to deliver consistent, high - torque pulling power over extended periods without overheating. They are ideal for heavy - duty applications where large trucks need to pull substantial loads, such as in construction, mining, or forestry. Hydraulic winches can operate continuously as long as the engine is running, providing a reliable source of power for demanding tasks. However, their installation is more complex compared to electric winches, and they require proper maintenance of the hydraulic system.
Manual winches are a more basic option. They are operated by hand, using a crank mechanism. Manual winches are simple in design and relatively inexpensive. They can be a good backup option or suitable for light - duty tasks where the truck is not stuck too firmly or when the load is not overly heavy. But they require significant physical effort from the operator, and the pulling speed is much slower compared to electric or hydraulic winches.
Truck winches are robust and versatile tools that have become indispensable for truck owners, especially those involved in off - road driving, heavy - duty towing, and industrial applications. These winches are engineered to handle significant pulling forces, making them capable of extricating trucks from challenging situations and assisting with various heavy - load tasks.
Types of Truck Winches
There are several types of truck winches, each with its own unique characteristics and advantages. Electric Winches are among the most popular choices. They draw power from the truck's electrical system, typically the 12 - volt battery. Electric winches are known for their ease of installation and operation. With a simple connection to the battery and the appropriate mounting, they can be up and running quickly. They offer a wide range of pulling capacities, from relatively modest amounts suitable for smaller trucks to extremely high - powered models capable of handling heavy - duty trucks and large loads. However, they do rely on the battery's charge, and continuous use can drain the battery, so it's important to ensure the truck's electrical system can handle the load.
Hydraulic winches, on the other hand, harness the power of the truck's hydraulic system, often connected to the power steering pump or a dedicated hydraulic pump. These winches are prized for their ability to deliver consistent, high - torque pulling power over extended periods without overheating. They are ideal for heavy - duty applications where large trucks need to pull substantial loads, such as in construction, mining, or forestry. Hydraulic winches can operate continuously as long as the engine is running, providing a reliable source of power for demanding tasks. However, their installation is more complex compared to electric winches, and they require proper maintenance of the hydraulic system.
Manual winches are a more basic option. They are operated by hand, using a crank mechanism. Manual winches are simple in design and relatively inexpensive. They can be a good backup option or suitable for light - duty tasks where the truck is not stuck too firmly or when the load is not overly heavy. But they require significant physical effort from the operator, and the pulling speed is much slower compared to electric or hydraulic winches.
Heavy Duty Truck Winch,Load-Sensing Truck Winch,12V/24V Truck Winch,High-Capacity Towing Winch
JINHUA RUNYE TECH. CO.,LTD , https://www.irunwinch.com