• Categories:Company news
• Author:
• Origin:
• Time of issue:2018-12-06 13:59

(Summary description) There are relatively many failures of welding machines, and the causes of failures are also more complicated. Often one result is caused by multiple reasons, or one cause can cause several results. Some faults are tricky to deal with. Let's first briefly describe the scratch accident. 1 Scratch The tube blank scratches in the welding machine are mainly caused by two parts, one is the guiding mechanism, and the other is the extrusion welding mechanism. 1. 1 Scratch of the guiding mechanism Scratches on the guiding part generally occur on both sides of the tube blank. If the guiding structure with the guide sleeve is not adjusted properly, the upper and lower surfaces of the tube blank will also have frictional scratches. The characteristic of this kind of scratch is the comparison of the wound surface. Large and strong continuity. The main reason is that the height position of the guide sleeve is incorrect, or the bearing of the upper and lower guide rollers is damaged. In addition, when the guide roll deviates too much from the rolling centerline, and the relative difference between the axis of the guide sleeve and the guide roll is too large, it will also cause scratches on both sides of the tube blank. 1. 2 Scratch of the extrusion welding mechanism The scratches caused by the squeeze roller mainly occur at the bottom of the tube blank. The reasons are roughly as follows: 1.1 Inconsistent pass pattern There are two-roller, three-roller and four-roller welding seam extrusion structures. As long as the combined pass does not match, it is easy to cause scratches on the surface of the tube blank. The two-roller structure is particularly prominent. There are many factors that cause the mismatch of the hole pattern. Take the two-roller structure as an example, such as bearing damage; roller axial movement; hole size different; two roller height positions are not the same; shaft bending and unstable assembly, etc. To 1.2 Height matching The lower edge of the squeeze roll pass should be consistent with the height of the rolling line, and the height of the guide roll is determined by the wall thickness of the tube. If the height of the guide roller is reduced to a certain limit, the rounded corners of the squeeze roller pass will cause scratches on the bottom of the tube, especially after the R rounded corners of the squeeze roller pass are sharpened, the scratches will be It's more likely to happen. To 1.3 Insufficient squeeze force on the squeeze roller, especially for the squeeze roller device with two-roll structure, when the upper squeeze force is insufficient, under the tension of the tube blank, the roller shaft will have an upward elevation angle, so that the edge of the hole is rounded. The corners protrude, causing scratches on the lower part of the tube blank. When the rounded corners of the squeeze roller pass pattern R are sharpened, it will aggravate the occurrence of scratches. Jiangsu Nanyang Machinery Manufacturing Co., Ltd. specializes in the design and manufacture of various types of high-frequency welded pipe units, stainless steel precision welded pipe units, high-precision steel-plastic and stainless steel composite welded pipe units; design and manufacture of various specifications and models of welded pipe molds-rolls, special-shaped rolls, thus The products have been serialized and enjoy a high reputation among domestic and foreign merchants.