Casting shaft hole water-cooling device for large marine fixed-pitch propeller

Abstract

The invention discloses a casting shaft hole water-cooling device for a large marine fixed-pitch propeller, which is provided with a shell, a heat-conducting filler and a core pipe for transmitting cooling water, wherein the heat-conducting filler is arranged inside the outer shell; the core pipe is arranged inside the filler; the outer shell is provided with a plurality of shell pieces; the shell pieces are connected with each other through deformation parts; and the distance among the shell pieces can be changed through the deformation of the deformation parts. The casting shaft hole water-cooling device for a large marine fixed-pitch propeller has a simple structure, obviously enhances the cooling speed of castings (especially castings having hole structures), obviously improves air hole defects in the shaft hole, greatly lowers the rejection rate, reduces the repair workload, shortens the working period and lowers the manufacturing cost of the large marine fixed-pitch propeller.

Description

technical field [0001] The invention relates to a large-scale marine fixed-pitch propeller casting shaft hole water cooling device. Background technique [0002] At present, domestic and foreign marine fixed-pitch propellers are usually manufactured by sand casting, and the technology is quite mature, but casting defects such as large propeller shaft holes and pores have been a problem that has plagued us for many years. Especially for large propellers with a diameter of more than 5m, due to their large volume, the copper alloy liquid solidifies slowly, and the shaft hole defects are more serious. [0003] Causes of porosity: 1. The gas has a certain solubility in the copper alloy liquid. During the solidification process, the solubility decreases as the temperature decreases, resulting in precipitated porosity defects; 2. The high-temperature copper alloy liquid interacts with the shaft hole sand core for a long time to cause intrusion. Stomatal and reactive stomatal defec...

AI Technical Summary

Problems solved by technology

[0002] At present, domestic and foreign marine fixed-pitch propellers are usually manufactured by sand casting, and the technology is quite mature. However, casting defects such as large propeller shaft holes and pores have been a problem that has plagued us for many years.

However, the effects of the above measures are not very satisfactory, and the cold iron production is more troublesome, and improper operation is likely to cause copper alloy liquid to drill into the sand core and cause sticky sand, which is difficult to clean.

In addition, propellers are mostly produced in one piece, and the reusability of cold iron is not good, and the cost of use is relatively high.

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