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Equipment for bend-forging crank axle toggle of large ship and method for forging the same

A bending and marine technology, which is applied in the bending forging device and forging forming field of large-scale marine crankshaft throws, can solve the problems that it is difficult to reflect the plastic flow and force of the metal, and the effect is limited, so as to reduce the research cost and achieve good forming quality. The effect of uniform machining allowance

Active Publication Date: 2007-04-18
SHANGHAI HEAVY MACHINERY PLANT +1
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AI Technical Summary

Problems solved by technology

[0007] In order to study the deformation mechanism of the crankshaft forging process, some forging workers try to use the lead sample simulation technology with a certain proportion of the actual crankshaft in size. Because lead and steel are different after all, it is difficult to reflect the metal deformation process of the real blank. For plastic flow and stress conditions, the role of lead simulation is limited

Method used

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  • Equipment for bend-forging crank axle toggle of large ship and method for forging the same
  • Equipment for bend-forging crank axle toggle of large ship and method for forging the same
  • Equipment for bend-forging crank axle toggle of large ship and method for forging the same

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Embodiment

[0050] The forged part in this embodiment is the 6S60MC-C crankshaft throw of MAN B&W patent company. The material of the blank is S34MnV, the weight of the blank is 16t, the heating temperature of the blank is 1250°C, and the material of the mold is 35CrMo. The whole forging process is carried out on a 10,000-ton hydraulic press. , The pressing speed of the upper anvil of the hydraulic press is about 20mm / s when bending, and the whole bending and finishing process takes about 40min. The simulation results of the bending and finishing process are shown in Figure 2-4. Figure 5a-b shows the comparison between the formed blank 9 (grid line part) and the processed part 8 (contour line part). It can be seen from the figure that the machining allowance of the entire forging It is relatively uniform, and the bell mouth defect of the blank is eliminated. Fig. 6 is a photo of the crank throw blank after final forming. It can be seen from the figure that the crank throw blank manufactur...

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Abstract

A bending-forging machine for manufacturing the large crankshaft or bellcrank used by ship is composed of upper die with lower arc end, bending lower die, upper and lower flat stocks, and insertion plate with lower arc end. Its forging method includes such steps as upsetting a steel ingot to become a flat square billet, drawing it to become a blank with shoulder, pressing V-shaped die on the middle of blank to form symmetric two V-shaped slots, bending by upper and lower dies, removing the upper and lower dies, inserting the insertion plate for finishing, trimming, and removing insertion plate.

Description

technical field [0001] The invention belongs to the field of forging, specifically a bending and forging device and a forging method of large-scale marine crankshaft crank throws. This process is obtained by computer simulation technology that has been verified in practice and is suitable for large-scale marine crankshaft crank throws. bending forging process. Background technique [0002] The shipbuilding industry is both a technology-intensive industry and a labor-intensive industry. After years of construction and accumulation, China's shipbuilding industry has the conditions to take off. China's shipbuilding industry has the production capacity of diesel engines from parts to complete machines, but the crankshaft, a key component of high-horsepower low-speed diesel engines, has always relied on imports. A diesel engine is the heart of a large ship, and the crankshaft is the heart of the engine. Only a few countries such as Japan, South Korea and the Czech Republic can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/06B21J13/02B21K1/08G06F17/50
CPCB21K1/08
Inventor 孙明月陆善平李殿中李依依
Owner SHANGHAI HEAVY MACHINERY PLANT
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