Casting Method to Prevent Shrinkage Porosity of Ductile Iron Crankshaft

A crankshaft and defect technology, which is used in the field of casting of ductile iron crankshaft castings for marine diesel engines

Active Publication Date: 2021-01-05
ZICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shrinkage defects generated at the crankshaft main journal and the crankshaft neck have not been solved

Method used

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  • Casting Method to Prevent Shrinkage Porosity of Ductile Iron Crankshaft
  • Casting Method to Prevent Shrinkage Porosity of Ductile Iron Crankshaft
  • Casting Method to Prevent Shrinkage Porosity of Ductile Iron Crankshaft

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with accompanying drawing:

[0035] Such as Figure 1 to Figure 8 Shown, the casting method of preventing ductile iron crankshaft shrinkage defect described in the present invention, take the following steps:

[0036] (1) Complete the design of casting molding process and the design of mold bottom plate and sand box:

[0037] It adopts two-box shape, which is divided into upper type and lower type. The upper and lower in the cross-sectional diagram in the figure refer to the upper type and the lower type respectively. According to the shape of the crankshaft, the first core 1.1, the second core 2.1, and the third core are respectively used. 3.1, No. 4 core 4.1.

[0038] The amount of sand eaten by the sand box is at least 50 mm, and the reinforcing ribs follow the shape to improve the strength of the sand mold. Hanging rings and vertical shafts are installed on both sides of the sand box to facilita...

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Abstract

The invention is mainly applied in the technical field of casting of nodular cast iron crankshaft castings of marine diesel engines and particularly relates to a casting method preventing a shrinkagedefect of a nodular cast iron crankshaft. The following steps that (firstly), process design of a cast model and design of a mold bottom plate and a sand box are completed; (secondly) a temperature field during box erecting of a casting is calculated, and hot section portions are determined; (thirdly) chilling blocks are designed at the positions of the hot section portions; (fourthly) riser design is performed, specifically, a spherical riser is arranged at the crankshaft free end to be used for feeding of the free end, and the riser is required to be provided with gas outflow holes; (fifthly) crankshaft, chilling block mold and tool manufacturing and installing are completed; (sixthly) a modeling procedure is completed; and (seventhly) casting and box erecting are performed are adopted.According to the method, the hot section positions are determined, the different chilling blocks are adopted on different portions to be matched according to the structure so that generated defects can be reduced, meanwhile, the riser, the chilling blocks and a manner that box erecting and casting are combined are adopted at the same time to solve the shrinkage defect, the effect is obvious, the production quality is improved, and cost is lowered.

Description

technical field [0001] The invention relates to a casting method for preventing shrinkage defects of ductile iron crankshafts, which is mainly applied in the technical field of casting castings of ductile iron crankshafts for marine diesel engines. Background technique [0002] Existing nodular iron crankshafts of diesel engines usually adopt resin sand molding process, which is flexible and widely applicable, and can produce all kinds of crankshafts, but the crankshaft main journal and crank crank neck are prone to shrinkage defects. [0003] At present, the production of ductile iron crankshafts in the foundry industry mainly includes resin sand technology and iron mold sand coating technology. Due to the large investment, iron mold sand coating technology mainly produces small crankshafts, while resin sand technology is widely used in large diesel engine crankshafts. However, the shrinkage and porosity defects produced at the main journal of the crankshaft and the cranksh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/02B22D27/04B22C9/08
CPCB22C9/02B22C9/088B22D27/04
Inventor 宋玉铎赵国栋贾宝富贾志明桑伟赵书健
Owner ZICHAI POWER CO LTD
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