The used roll forming machine reflects that the quality of the finished welded pipe is generally based on whether the sawing quality meets the standard.The sawing quality is critical in the two levels of length precision and cut section.

The principle of length difference and its improvement countermeasures

No matter which disconnection method is selected, when the disconnection length is set, there are three differences in the specific cutting length: long, insufficient, and different lengths.Because the disconnection method and operation method selected for disconnecting the machinery and equipment are different, the reason is not the same. Here is a specific analysis of an example of using the most common DSP to operate a fixed-length flying saw at this stage. The following is an analysis and countermeasures for the three problems of long tube length, insufficient length, and different lengths.

Longer

When the used roll forming machine manufactures welded pipes, the welded pipe will be longer. The principle of the longer welded pipe is that the length of the welded pipe is longer than the length converted by the encoder according to the measuring wheel, and most of them are related to the tachometer wheel:

①The working pressure of the tachometer wheel is too small, causing loss of rotation; ②the tachometer wheel is inefficient and has high friction resistance, which causes the tachometer wheel to slip and lose rotation; ③the tachometer wheel is too smooth and easy to slip; ④the tube surface is oily, causing the tachometer wheel Skidding.

Possible countermeasures: ①Expand the contact stress of the tachometer wheel; ②Ensure that the tachometer wheel and the encoder rotate flexibly, with a few turns of inertial force at random; ③Reduce the smoothness of the tachometer wheel touching the surface to expand sliding friction.

Less than a ruler

When using the used roll forming machine to manufacture welded pipes, the welded pipe may not be of sufficient size. The reason for the insufficient size of the welded pipe: The direct reason is that the length of the welded pipe is longer. The length of the tachometer wheel is longer than the length of the pipe.

The actual reason is:①Improper adjustment of the rolling force of the unit resulted in unstable tube billet operation and slippage. The tachometer wheel has a moment of inertia. When the slip rate of the tube billet slows down, the tachometer wheel still rotates at the original speed and the encoder still remembers Count; ②The contact stress of the tachometer wheel is too small. When the tube is slipping, the tachometer wheel still pushes the encoder to count again under the rotating inertia force.

Available treatment methods: distribute the cold rolling force of the generator set, increase the working pressure of the flat roll moderately, and reduce the working pressure of the vertical roll to ensure the stable operation of the tube blank, so as to remove the rotational inertia force of the tachometer wheel as much as possible. In addition, the contact stress of the tachometer wheel can be appropriately expanded.

Different lengths

Root cause analysis: First, we must find the reasons from the aspects of the precision of the welded tube generator set, the stability of the tachometer wheel and the encoder connection, the connection stability of the operating car and the drive organization, such as the large gap between the racks and the coordination of the operating car. The specific 0 bit and running 0 bit are not allowed to be clear, which makes the DSP count lose the standard; secondly, it is necessary to find the reason from the high frequency influence level.

Countermeasures: ①Check the equipment grounding device to avoid embrittlement, and ensure that the high-frequency machine equipment grounding device and the flying saw grounding device are good; ②Check the connection of part of the flying saw driver to ensure that it is strong and reliable; ③Check and remove the welded pipe The generator set equipment is faulty.

The above are the measures to improve the cutting quality of the used roll forming machine. I hope it will help you. Our company focuses on the supplier of used high-frequency welded pipe machines. If you need to buy used high-frequency welded pipe machines, we welcome new and old customers to consult and order.