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Shandong Dorco Heavy Machinery Co., Ltd.
Shandong Duolek Heavy Machinery Co., LTD., located in Puji Industrial Park, Jiaozhou, Qingdao, Shandong Province. We are a large-scale heavy industry machinery manufacturing enterprise in China. The company is mainly engaged in the design, manufacturing, and installation of large-scale equipment such as heavy industry machinery, ring rolling machines, steel spiral welded pipe machines, mining machinery, etc. Its products cover multiple series such as self unloading, construction, sanitation, ...
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Shandong Dorco Heavy Machinery Co., Ltd.

Quality Ring Rolling Machine & Vertical Ring Rolling Machine factory

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Lastest company news about Applicability analysis of radial axial ring rolling machine in the field of large ring components!
Applicability analysis of radial axial ring rolling machine in the field of large ring components!

2026-04-16

As industry trends toward larger scales and higher performance, the production of semi-finished materials mirrors this shift. Large semi-finished components—such as those used in wind turbine generators and critical parts for nuclear reactors—are still predominantly manufactured via open-die forging processes, though certain applications can now be partially replaced by ring rolling using radial-axial ring rolling mills. Traditional Manufacturing Method: Large Open-Die Forging Presses: These components are commonly produced using mandrel forging, which relies on large open-die forging presses with forging forces adjusted according to workpiece specifications. The starting stock is prepared from a raw material block matching the required weight, with additional material allowance to compensate for losses. When metallurgical properties permit, hollow ingots may also be used. Once the starting stock is ready, it is forged over a mandrel to achieve the specified dimensions. Mandrel forging is a time-consuming process: the workpiece must be rotated incrementally during repeated forging strokes, and intermediate reheating is often required to offset temperature loss and maintain proper forging temperatures. Radial-Axial Ring Rolling Mill: The ring rolling process offers distinct advantages for precisely forming such rotationally symmetric workpieces and can, under suitable conditions, partially replace mandrel forging. The radial-axial ring rolling mill is a well-suited piece of equipment for large ring forging applications. Compared with open-die forging, the ring rolling process demonstrates favorable applicability for large, rotationally symmetric workpieces with sufficient central bore diameters. It enables more precise forming and can serve as a viable alternative to conventional mandrel forging for the production of such large rings. Focusing on large ring forging, the advantages of the radial-axial ring rolling mill are evident from both metallurgical and economic perspectives: 1,By first preparing a pre-forged ring blank, the high forging ratio required for large rings is ensured, thereby enhancing the metallurgical properties of the product. 2,It enables precise final sizing and rolling of large rings, ensuring dimensional accuracy that meets the stringent demands of large-scale ring components. 3,The equipment specifications align well with large ring production requirements, with investment scale appropriately matched to the initial wall thickness of the ring blank. 4,By replacing the traditional final forging stage, the process reduces raw material consumption in large ring production, contributing to better control of overall manufacturing costs. The Duolek D53KF series horizontal ring rolling machine adopts CNC technology, which can achieve simultaneous radial and axial rolling of ring components. When operating, simply input parameters such as the size and material grade of the ring, ring blank, and rolling mill, and the equipment will automatically execute the rolling process. The size of the ring and the operating status of the machine will be displayed in real-time on the screen.In addition, the company has also developed bulging machines, loading and unloading machines, operating machines, forging hydraulic presses, rotary forging machines, and large-scale ring automation production lines that are compatible with large-scale ring rolling machines. These devices help to improve the level of production automation, enhance environmental quality and production efficiency, and reduce labor costs for enterprises. Welcome domestic and foreign customers to inquire and negotiate.
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Latest company case about Analysis of the core equipment of DUOLEK spiral welded pipe production line!
Analysis of the core equipment of DUOLEK spiral welded pipe production line!

2025-10-31

An efficient and reliable spiral welded pipe production line not only relies on precision forming and welding hosts, but also on a series of powerful auxiliary equipment.These devices are mainly responsible for end face precision machining, quality inspection, and performance testing of formed welded pipes, which is a key guarantee to ensure that the final product fully meets strict industrial standards in terms of dimensional accuracy, end face quality, pressure bearing capacity, and internal integrity. They together constitute an indispensable finishing and quality inspection process in automated steel pipe production.Fully automatic steel pipe hydrostatic testing machineThe hydraulic testing machine is mainly used for pressure testing of welded pipes, and has the functions of computer recording, storage, printing, and test results.It has the advantages of high efficiency, high testing pressure, and strong safety.The range of pipe diameter is from 20 to 3500mm, and the test pressure is 10-110MPa.Process flow: upper pipe - connecting pipe - water filling - pressure pressing - pressure holding - pressure relief - drainage - outlet pipe. Fully automatic flat head chamfering machine:The flat head chamfering machine is mainly used for flattening and chamfering the ends of welded pipes. Equipped with a contour chamfering knife, the processed groove is uniform and beautiful. Our company provides flat head chamfering machines for steel pipe production enterprisesProcessing range covers steel pipe diameter:φ20mm-φ3500mm, Simultaneously meet standards such as API-5L, API-5CT, BS1387-85, ASTM, GB9711, etc.Process flow: upper pipe - connecting pipe - clamping - flat head chamfering - releasing fixture - outlet pipe Ultrasonic flaw detector:Take the initiative to alarm and spray marks if there are shortcomings, and workers adjust parameters accordingly;The parts with continuous ultrasonic testing marks on the weld seam shall undergo manual ultrasonic and X-ray re inspection again;Defects will be repaired and undergo non-destructive testing again until they are confirmed to be cleared; X-ray steel pipe inspection:The detection system seamlessly integrates with the entire production line, adapting to the control and management process requirements of steel pipe manufacturers.Welding seam automatic recognition technology facilitates automatic control during the preparation stage of inspection; With a database, the detection parameters of the same product can be automatically loaded with just one click, and the entire system has a high degree of automation.
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Shandong Dorco Heavy Machinery Co., Ltd.
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WHAT CUSTOMERS SAYS
Ahmed Hassan
Excellent machine performance, increased our productivity and reduced material waste significantly.
Hans Müller
Robust construction and precise rolling results—highly recommend for industrial applications.
Maria Garcia
Reliable operation and minimal maintenance—perfect for long-term manufacturing needs.
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