Inverted model structure of marine adjustable pitch propeller oil cylinder

Abstract

The invention relates to the technical field of propeller accessory manufacture, in particular to an inverted model structure of a marine adjustable pitch propeller oil cylinder. The structure comprises a sand box, a riser, a I# core, an II# core, chilling blocks and a casting system, wherein the II# core is an oil cylinder liner core, is inverted in the middle of the sand box and forms an oil cylinder type cavity with an inner box of the sand box; the riser is placed in the sand box, the upper end surface of the riser is flush with the upper surface of the sand box, and the riser is located at the upper part of the oil cylinder type cavity; the I# core is placed in the middle of the riser and located at the upper part of the oil cylinder type cavity; a plurality of chilling blocks are arranged in the sand box the on the outer ring of the II# core; and the casing system is communicated with the bottom edge of an oil cylinder flange of the oil cylinder type cavity. The chilling blocks surround the outer edge of the oil cylinder flange of the oil cylinder type cavity to form an annular structure. By means of the technical scheme, the problems of excessive processing margin, labor consumption and time consumption of secondary processing, increased cost, low yield and the like in the prior art are solved.

Description

technical field [0001] The invention discloses an inverted molding structure of a pitch control propeller oil cylinder for a ship, relates to the technical field of manufacturing propeller accessories, and in particular relates to an inverted molding pouring structure of a pitch control propeller oil cylinder for a ship. Background technique [0002] The marine controllable pitch propeller oil cylinder is a main part of the controllable pitch propeller, its interior is filled with oil, and the piston cylinder moves to help change the pitch of the controllable pitch propeller. According to the general technical requirements of oil cylinders for controllable pitch propellers of the design unit and the requirements of classification societies, the entire inner cavity of marine controllable pitch propeller cylinders is within 1dm 2 The number of defects allowed to exist in the reference plane is only 12, and the maximum allowable diameter of a single defect is 1mm. If the inner...

AI Technical Summary

Problems solved by technology

[0004] (1) The open molding method causes serious casting defects in the inner cavity of the oil cylinder, and the product scrap rate is high, exceeding 50%.

[0005] (2) The open shape makes the inner cavity of the oil cylinder exceed the standard. After welding and repairing, the oil cylinder cannot withstand high pressure, and is prone to oil leakage and deformation

[0006] (3) The open modeling method makes the defects in the inner cavity of the oil cylinder exceed the standard. After welding and repairing, it consumes a lot of labor hours, welding rods, electric energy and other capital expenditures

[0007] (4) Open molding method, the machining allowance of the inner cavity of the oil cylinder must be artificially increased during molding, a large amount of molten metal will be consumed during pouring, and the machining workload of the inner cavity of the blank part is large, which reduces the yield of the process, wastes materials, and consumes man-hours

[0008] (5) Open molding method. When pouring, the inner cavity of the oil cylinder is connected with the riser, which easily makes the molten metal in the inner cavity of the oil cylinder directly contact with the air, resulting in the easy oxidation of the molten metal in the inner cavity of the oil cylinder, resulting in casting defects; at the same time, the riser fills Improper shrinkage can easily cause shrinkage and shrinkage defects in the inner cavity of the cylinder

[0009] (6) Open molding method, because of the thick flange of the oil cylinder, it is difficult to establish a reasonable temperature gradient, and sequential solidification cannot be achieved, which is easy to cause casting defects in the inner cavity of the oil cylinder

[0010] (7) Open molding method, when pouring, the oxidized slag can easily enter the bottom of the oil cylinder through the pouring system, resulting in oxidized slag inclusion defects at the bottom of the inner cavity of the oil cylinder

Images