How to remove carbon steel seamless pipe cutting burrs

Deburring is a non-productive process during carbon steel seamless pipe cutting and carbon steel seamless pipe welding construction. It not only increases the maintenance cost of carbon steel seamless pipes, but also prolongs the construction and production cycle of carbon steel seamless pipes. In addition, improper burr removal methods will cause the entire pipeline to be scrapped and re-cut and welded, causing economic losses.

1. Method for removing burrs from carbon steel seamless pipes

The following is a brief introduction to several methods of deburring carbon steel seamless pipes to study the deburring process and time:

1.1 Thermal deburring

Thermal deburring (TED) uses the high temperature generated after the deflagration of the mixture of hydrogen and oxygen gas or oxygen and natural gas to melt the burrs, and its powerful airflow blows away the melted burrs.

There is also a deflagration thermal energy method to remove burrs. This method is to pass oxygen and hydrogen or natural gas and oxygen into a closed container, and ignite it through a spark plug, causing the mixture to explode instantly and release a large amount of heat energy to remove burrs. However, after the burrs on the surface of the carbon steel seamless pipe are exploded and burned, the oxidized powder will adhere to the surface of the workpiece, and must be cleaned or pickled to remove the oxidized powder particles accumulated on the surface of the carbon steel seamless pipe.

1.2Hand grinding wheel

Use a manual grinder to manually clean the burrs remaining on the surface of the carbon steel seamless pipe after cutting. During the cleaning process, due to the instability of hand-held tools, which is closely related to the operator, the surface of the polished and unpolished carbon steel seamless pipes becomes uneven, making the surface of the carbon steel seamless pipes begin to become rough and uneven. Evenly.

1.3 Electrolytic deburring

The so-called electrolytic deburring is essentially a chemical deburring method. It can remove burrs from mechanical processing, grinding and stamping of carbon steel seamless pipes, and deburrs the metal sharp edges of carbon steel seamless pipes. Round or chamfered.

Using electrolysis to remove burrs on the metal edges of carbon steel seamless pipes after cutting is an electrolytic processing method, referred to as ECD in English. Fix the tool cathode (usually made of brass) near the part with burrs after cutting the carbon steel seamless pipe, with a certain gap (usually 0.3~1mm) between them. The conductive part of the tool cathode is aligned with the burr edge, and the other surfaces are covered with an insulating layer to concentrate the electrolysis on the burr part of the carbon steel seamless pipe.

During processing, the cathode of the tool is connected to the negative pole of the DC power supply, and the workpiece is connected to the positive pole of the DC power supply. The low-pressure electrolyte (usually sodium nitrate or sodium chlorate aqueous solution) with a pressure of 0.1 to 0.3 MPa flows between the edge of the carbon steel seamless pipe and the cathode. When the DC power supply is turned on, the burrs will dissolve in the anode and be removed, and will be taken away by the electrolyte.

Since this electrolyte is corrosive to a certain extent, the edges of carbon steel seamless pipes should be cleaned and rust-proofed after deburring. Electrolytic deburring is suitable for removing cross holes or burrs in hidden parts of carbon steel seamless pipes after cutting. The production efficiency of burr removal is high, and the deburring time generally only takes a few seconds to tens of seconds. The disadvantage of this burr removal method is that the parts near the burrs are also affected by electrolysis, and the surface will lose its original luster and even affect the dimensional accuracy.

In addition, there are electrostatic methods, abrasive particles (similar to water cutting and pollution), and magnetic grinding technology for burr removal operations. Correspondingly, some are used for carbon steel seamless pipe operations such as large instruments and central air conditioners with higher precision.

2. After understanding the method of removing burrs, you will think that since deburring is so laborious, it is better to find a way to control it from the source and choose carbon steel seamless pipes such as the XJQG-1 explosion-proof pipe cutting machine with higher cutting accuracy. Pipe cutting tools, and learn how to reduce the generation of burrs through cutting, advancing and retracting knives, and blade processing.

When cutting carbon steel seamless pipes, the pipe cutting machine milling cutter moves according to the cutting motion of the carbon steel seamless pipes. The burrs generated by the cutting edge of the tool during the wall breaking process of the carbon steel seamless pipes mainly include burrs on both sides of the main blade. There are several forms such as cutting out burrs in the cutting direction on the side.

2.1 Generally speaking, compared with other burrs, burrs in the cutting direction of the bottom edge are larger in size and difficult to remove. The formation of burrs on the cutting surface of carbon steel seamless pipes is a very complex material deformation process. Various factors such as workpiece material properties, geometry, surface treatment, tool geometry, tool cutting path, tool wear, cutting parameters and coolant use directly affect the formation of burrs. Therefore, it is necessary to change the wall-breaking angle of the pipe cutting machine milling blade, and use multiple angles such as 12, 17, 22, etc., and correspondingly increase the chip discharge groove at the end of the blade so that the chips will not be retained.

After many times of cutting carbon steel seamless pipes, improving the cutting entry and exit angles of the milling cutter has a considerable inhibitory effect on the formation of burrs.

2.2 Carbon steel seamless pipe cutting operations with higher precision requirements change the cutting exit sequence

During the cutting of carbon steel seamless pipes, the burr size depends largely on the exit method of the milling cutter tip. If point A of carbon steel seamless pipe cutting is the cutting exit point, point C is the point on the main cutting edge of the milling cutter, and point B is the tip tip of the carbon steel seamless pipe wall. It is assumed that the tool tip is sharp, that is, the tool tip arc radius is not considered. If edge B-C exits the carbon steel seamless pipe cutting first, and edge A-B exits the pipe wall later, the chips will be hinged on the machined surface. As milling proceeds, the chips will be pushed out of the carbon steel seamless pipe wall, forming a larger bottom. The edge is cut with burrs in the cutting direction. If edge A-B exits the tube wall first and edge B-C exits the tube wall later, the chips are hinged on the transition surface and are cut out of the workpiece, forming a smaller bottom edge cutting burr in the cutting direction.

Therefore, in the cutting operation of carbon steel seamless pipes, the most demanding method that produces smaller burrs is to tighten the fastening screws on both sides of the splint after cutting the pipe cutting machine to break the wall, and fix the angle for cutting. . Then when retracting the knife, first loosen the screws on both sides of the splint, raise the machine position, increase the cutting speed and then stop cutting, so that no burrs will be generated.

In short, the formation of burrs in carbon steel seamless pipe cutting operations is not only related to the sharpness of the milling blade, but also to factors such as feed rate, milling depth, carbon steel seamless pipe material, size, and cutting conditions. Therefore, the formation of burrs during carbon steel seamless pipe cutting operations is a condition that can be reduced through a combination of factors.

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