Casting Method of Steel Castings for Large Bore Marine Low Speed Diesel Engine Bearing Blocks
A diesel engine and bearing seat technology, which is applied in casting molding equipment, casting molds, casting mold components, etc., can solve the problems of metal inclusions and micro-cracks due to differences in molten steel temperature and physical and chemical properties, and achieve improved refractoriness and concessionality. Solidity guarantee, the effect of increasing the service life
Active Publication Date: 2017-03-29
YICHANG MARINE DIESEL ENGINE
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a casting method for large-bore marine low-speed diesel engine bearing seat castings, which can overcome the differences in molten steel temperature and physical and chemical properties caused by simultaneous pouring of multiple ladles of molten steel in the prior art, as well as metal inclusions, Problems with casting defects such as microcracks
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[0038] A method for casting a large-bore marine low-speed diesel engine bearing seat casting, comprising the following steps:
[0039] First of all, the casting process is compiled, and the casting process of the bearing seat of the output end of the RT-flex82T-B marine low-speed diesel engine is compiled, including the position of the outer chiller, the position of the open and dark riser, the position of the air outlet, the pouring system, the pouring temperature, the pouring weight, holding time, etc., such as Figure 1~2 shown.
[0040] 1. Master mold making;
[0041] In the step of making the mother mold, the upper half mother mold 1 and the lower half mother mold 2 are made according to the center of the bolt hole, and the upper half mother mold 1 and the lower half mother mold 2 are respectively fixed on two templates, and the template is fixed on the On the structure 15, in order to avoid deformation of the master mold, positioning pins 14 are provided at the four co...
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The invention discloses a casting method for a steel casting of a bearing pedestal of a low-speed diesel engine for a large-cylinder-diameter ship. The casting method comprises the following steps: 1, female die manufacturing; 2, sand mixing; 3, core manufacturing; 4, modeling, wherein a bottom injection type pouring system is adopted, the pouring system is provided with a plurality of sprue cups communicated with a gathering mixing cavity, and the lower part of the gathering mixing cavity is communicated with a plurality of pouring pipes; 5, coating brushing and box closing; 6, smelting; 7, pouring by closing a furnace; 8, sand clearing, thermal treatment and aftertreatment, wherein the bearing pedestal of the low-speed diesel engine for the large-cylinder-diameter ship can be obtained by the steps. According to the casting method for the steel casting of the bearing pedestal of the low-speed diesel engine for the large-cylinder-diameter ship, by the gathering mixing cavity formed in the pouring system, multiple bags of molten steel enter the pouring pipes after being mixed, so that the molten steel pouring temperature and the uniformity of the physical and chemical properties of the casting are guaranteed.
Description
technical field [0001] The invention relates to the field of casting, in particular to a casting method of a large-bore marine low-speed diesel engine bearing seat casting. Background technique [0002] Large-bore marine low-speed diesel engine bearing castings are key components of diesel engines, such as RT-flex82T-B diesel engine bearings, the castings have a large outline size, and the length, width and height are 2267mm×2730mm×680mm; the wall thickness varies widely, and the maximum wall thickness 410mm, the minimum wall thickness is 43mm; the two through-bolt holes are slender, and the size is Ø170mm / Ø117mm×2267mm; the quality of the casting is large, the weight of the blank is 11500kg, and the weight of the casting is 21000kg; the product quality requirements are high, and the magnetic particle flaw detection is carried out by a third party according to the Ⅱ standard , Ultrasonic flaw detection inspection and physical and chemical performance inspection, the bearing ...
Claims
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IPC IPC(8): B22C9/02B22C9/10B22C9/22B22C1/22C21D1/28
CPCB22C1/00B22C9/02B22C9/08B22C9/10B22C9/22C21D1/28
Inventor 刘为作黄浩部显文
Owner YICHANG MARINE DIESEL ENGINE