So far, all domestic and foreign methods for producing hydraulic steel pipes have followed these steps:

Step 1: Processing of steel pipes;

Step 2: Processing of joints;

Step 3: Welding of steel pipes and joints;

Step 4: Machining at the welded joint of steel pipes and joints.

 

 

1. Using welding processes results in unstable weld seam quality, changes in the microstructure of the heat-affected zone, often leading to defects in hydraulic steel pipes (such as oil leakage, pipe fracture, etc.);

2. Extensive welding processes easily lead to environmental pollution, especially with CO2 emissions, which contradict efforts to purify the surrounding air;

3. Ultraviolet radiation from welding arcs can harm human eyes;

4. Welding processes require a large amount of materials such as pipe fittings, welding wire, welding rods, etc., leading to energy and labor waste due to repetitive processing;

5. During the cleaning process of hydraulic steel pipes, residues often remain in the gaps between the pipe and the joint, affecting the early wear of hydraulic components in the hydraulic system.

 

The new method provides a hydraulic steel pipe joint and its extrusion forming method and production equipment, overcoming the shortcomings of welding processing used in hydraulic steel pipe joints in the background technology.

 

 

Step 1: Preparation of steel pipes;

Step 2: Heating the end of the joint with high frequency to soften it;

Step 3: Extrusion to directly form the joint blank by compressing the end of the steel pipe;

Step 4: Machining the joint blank to form the joint.

 

This technological solution effectively combines high-frequency heating and direct extrusion forming with the working characteristics of hydraulic steel tubes.

 

 

1. The joint formed by extrusion is part of the original steel pipe, thus integrated molding without weld seams, avoiding the shortcomings of the background technology;

2. Better sealing performance and higher compressive strength of the steel pipe;

3. During high-frequency heating, besides softening and deforming the end of the joint, localized quenching is also achieved, greatly improving the overall hardness of the end;

4. The integrated structure of the steel pipe and joint improves the overall lifespan of the steel pipe, achieves high purification standards, enhances the product quality of purifying the environment, making the product widely applicable in hydraulic systems of earthmoving machinery, mining machinery, engineering machinery, etc.;

5. No environmental pollution, high operational safety performance;

6. Adopting this production process can reduce costs, reduce machining steps, eliminate welding processes, effectively reduce material consumption, lower investment production costs, and improve production efficiency;

7. Adopting the method of fixing the steel pipe on the workbench and moving the mold for extrusion makes it easy to operate and control;

8. The temperature of high-frequency heating ranges from 700°C to 800°C, with a time of 3 seconds to 300 seconds, not only deforming the end of the joint but also achieving localized quenching;

9. Using hydraulic pressure to drive the mold to extrude the end of the steel pipe into a joint blank is easy to operate and control;

10. The extrusion holding time is generally 10 seconds to 120 seconds, resulting in good forming quality.