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• Release time：2025-02-18 10:15
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【概要描述】In the used pipe welding machine, the mold is one of the core components, which directly determines the quality, accuracy and production efficiency of the welded pipe. Its role runs through the entire pipe making process, mainly including the following aspects: 1. Molding effect Strip pre-bending and forming: The mold (such as forming roller, guide roller) gradually bends the metal strip (steel strip, stainless steel strip, etc.) into the desired tubular shape (such as round, square, rectangular, etc.) through multiple passes. It is necessary to control the deformation of the material during the molding process to avoid stress concentration or surface scratches. Progressive deformation: Through the continuous coordination of multiple sets of molds, the strip gradually curls from the plane into a closed tube blank, ensuring that the weld edge is aligned and providing the basis for subsequent welding. 2. Welding aid Weld extrusion: In the welding stage (such as high-frequency induction welding, argon arc welding), the mold (such as extrusion roll) to apply pressure to the edge of the tube blank, so that the molten metal tightly together, eliminate the weld porosity or inclusion, improve the welding strength. Heat control: Some mold designs have a cooling system to prevent overheating of the welding area from causing deformation or degradation of material properties. 3. Sizing and calibration Dimensional accuracy control: The sizing die (sizing roll) accurately calibrates the welded pipe to ensure that the outer diameter, roundness and other parameters meet the standard. This is particularly critical for high-precision pipes (such as mechanical structure pipes and fluid transport pipes). Elimination of residual stress: Through the mechanical correction of the mold, the internal stress generated during the molding and welding process of the pipe is reduced to prevent subsequent deformation. 4. Surface treatment and straightening Polishing and finishing: Some molds (such as polishing rollers) can sand the surface of the tube to remove burrs or oxide layers and improve the surface finish. Straightening function: Straightening die (straightening roll group) corrects the straightness of the pipe to ensure that the finished product is straight without bending. 5. Adapt to different specifications Quick change: By changing the mold combination, the same welding machine can produce pipes of different materials, diameters, wall thicknesses or section shapes, improving the flexibility of the equipment. Special precautions for used pipe welding machine mold Wear and life: Used molds may have wear, deformation or fatigue cracks due to long-term use, it is necessary to check the integrity of key contact surfaces (such as molding roll grooves, sizing roll surfaces), and repair or replace if necessary. Compatibility: Ensure that the mold is compatible with the power system of the second-hand equipment (such as roller speed, pressure) to avoid production failures caused by parameter mismatch. Maintenance costs: The maintenance of used molds (such as surface coating repair, bearing replacement) may increase operating costs, need to evaluate the cost performance. Sum up In the used pipe welding machine, the mold undertakes forming, welding auxiliary, sizing, straightening and other multiple tasks, and its state directly affects the quality and production efficiency of the pipe. When buying or using used equipment, it is necessary to focus on checking the wear, matching and maintenance history of the mold, and upgrade or customize it if necessary to meet the current production needs. For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier：www.usedpipemill.com JinYuJie-Used Pipe Mills Supplier（Please click the link→) :second-hand pipe mill