Rifling Processing of Seamless Steel Pipes

Seamless steel pipe is an important steel material, widely used in industrial fields such as petroleum, chemical, electric power, aviation, and aerospace. The rifling of seamless steel pipes is the spiral line on the pipe wall, which is used to increase strength and hardness, as well as improve air tightness and liquid tightness.

Advantages of seamless steel pipe rifling processing

Compared with other processing methods, seamless steel pipe rifling processing has the following advantages:

1. Low processing cost and high production efficiency. For example, when manufacturing a large number of seamless steel pipes used in pup joints for construction, efficient and low-cost rifling processing can reduce the overall project cost.

2. High processing accuracy, able to accurately control the length, depth and angle of the rifling. This high precision is essential for manufacturing seamless steel pipe such as precision tube that have strict requirements on dimensional accuracy and internal structure.

3. The surface of the rifling after processing is smooth and burr-free. This feature has obvious advantages in scenarios where the medium inside the pipeline needs to be smoothly transported.

4. No subsequent processing is required and it can be used directly, which greatly shortens the production cycle.

Rifling processing method and principle

The rifling processing principle of seamless steel pipe is to use the inner spiral trolley to cut a certain spiral line on the inner surface of the steel pipe. The cutting depth of the rifling and the movement speed of the tool must be controlled very accurately to ensure that the size and quality of the rifling cut out meet the requirements. The rifling processing of seamless steel pipes is divided into two types: condensation method and thermal condensation method, among which condensation method is one of the commonly used processing methods.

1. Condensation method processing

First, spray the paint on the surface of the seamless steel pipe, and then cool the paint to form a film. Next, wrap a steel wire around the film. Due to the condensation of the paint, the steel wire will condense on the pipe wall together with the paint to form a spiral line. Finally, the spiral line is cut into a suitable length and angle by cutting and grinding to form it.

2. Thermal condensation method processing

The thermal condensation method is to process the spiral line on the seamless steel pipe by thermal condensation. Pull the heated wire to the pipe wall, and then apply a layer of paint on the wire surface. The paint is solidified and the wire is condensed by cooling, and then the wire can be removed.

Precautions

1. Selection of cutting tools

The selection of cutting tools should be based on the material of the steel pipe, the required processing quality and the cutting process requirements, so as to select the best cutting effect. At the same time, in order to avoid cutting errors and safety problems, the quality of the tool should be guaranteed.

2. Cutting depth control

The control of cutting depth is very important, and attention should be paid to it at all times during the cutting process to ensure that the quality of rifling cutting meets the requirements.

3. Cleaning

During the cleaning process, be careful not to use too rough brushes or too strong water flow, which will cause damage to the cutting marks on the surface of the steel pipe.

4. Safety

During the operation, attention should be paid to safety issues, such as the operating status of the machine tool and whether the safety protection facilities of the operator are in place.

Summary

In short, the processing of the rifling of seamless steel pipes is to wrap the spiral wire around the pipe wall by condensation or thermal condensation, and then form it through processes such as cutting and grinding. This processing method has the advantages of low cost, high processing efficiency and high processing precision, which is of great significance for the production and processing of seamless steel pipes.

Read more: Seamless Steel Pipe Sizes