Method for preventing cracks of marine diesel engine cylinder sleeve casting
A technology for marine diesel engines and cylinder liners, which is applied in the direction of casting molds, casting mold components, casting molding equipment, etc., can solve the problems of casting scrapping, etc., achieve the effects of eliminating cracks, obvious effects, and improving the pass rate
Active Publication Date: 2014-04-30
SHANGHAI HULIN HEAVY IND
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Problems solved by technology
Therefore, relatively speaking, the cylinder liner of a marine diesel engine is a thin-walled part. During the casting process, due to the existence of factors such as casting stress and unpacking operation, the casting is often in the process of the bottom of the cylinder liner casting during the cooling process after unpacking. Cracks occur in the riser, and the cracks tend to spread upward to the body of the cylinder liner casting, resulting in the scrapping of the casting
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[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention cannot be limited by this.
[0020] The invention provides a method for preventing cracks in cylinder liner castings of marine diesel engines, please refer to figure 2 and image 3 1. An annular rib cavity is set at the bottom periphery of the inner hole core 1 for casting the diesel engine cylinder liner, and the cylinder liner casting blank 2 with the annular rib in the inner hole of the riser part of the process is poured.
[0021] The method for preventing cracks in marine diesel engine cylinder liner castings includes the following specific steps, please refer to figure 1 :
[0022] 1) Make the wooden mold of the circular reinforcing rib, and place the wooden mold of the circular reinforcing rib in the wooden mold of the inner core;
[0023] 2) In the combined wooden mold, the inner hole ...
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The invention discloses a method for preventing cracks of a marine diesel engine cylinder sleeve casting. Annular reinforcing rib cavities are arranged at the periphery of the bottom of an inner hole mud core for diesel engine cylinder sleeve casting, and a cylinder sleeve casting blank is poured, wherein an inner hole of a technological dead head part is provided with annular reinforcing ribs. The method comprises the following particular steps: 1) manufacturing a wooden mold of the annular reinforcing ribs, and placing the wooden mold of the annular reinforcing ribs into a wooden mold of the inner hole mud core; 2) shaping the inner hole mud core in a combined wooden mold once, wherein the annular reinforcing cavities are formed in the periphery of the bottom of the inner hole mud core; 3) taking out the inner hole mud core from the wooden mold, and coating with paint; 4) carrying out box allocating operation after the inner hole mud core is dried and condensed; and 5) pouring, thereby obtaining the cylinder sleeve casting blanking, wherein the inner hole of the technological dead head part is provided with the annular reinforcing ribs. The method disclosed by the invention can prevent cracks generated by the cylinder sleeve casting from extending toward the body, thus reducing the scrappage of the casting, and increasing the yield of the casting.
Description
technical field [0001] The invention relates to a process method for pipe castings, in particular to a method for preventing cracks in cylinder liner castings of marine diesel engines, and belongs to the technical field of diesel engines. Background technique [0002] Cylinder liner is one of the key parts of diesel engine, and its quality will play a decisive role in the quality of the whole diesel engine. Therefore, there are very high quality requirements for cylinder liner in the diesel engine quality specification. [0003] The cylinder liner of marine diesel engine is generally a casting product, which is characterized by a large diameter of the inner hole of the casting (depending on the model, the maximum can reach 980mm at present), and a high height (the height of the casting of some models can reach about 5 meters), and in order to Ensure that the surface structure of the inner hole of the casting is dense after finishing, and the machining allowance of the inner ...
Claims
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Inventor 马方飞尤敬东尹彦普
Owner SHANGHAI HULIN HEAVY IND