JPH01237068A - Internal chilling type marine propeller - Google Patents

Abstract

PURPOSE:To manufacture a large-sized propeller of high accuracy in the casting factory whose melting capacity is small scaled by fixing the blades made of individual bodies in advance by positioning them to the lower die of the mold for a boss, making the mold of a boss by fitting a core and an upper die and pouring a molten metal therein. CONSTITUTION:The blade 11 on which the projecting part 13 of a blade root part 12 is formed is manufactured. The plural blades 11 are fixed at their positions centering around the lower die 7 of the mold for boss in a complete state, a core 6 and the upper die 8 of the mold for boss are fitted with a print matrix 9 and the mold of a boss 1 provided with a flow-off 10 in advance is completed. A molten metal 3 is poured into this mold through a sprue 4 and runner 5 and each blade 11 is integrally fixed to the boss 1 by solidifying it. The build-up part 15 by welding with the blade root part 12 and boundary part 15 of the boss 1 is smoothly formed after its forming. The machining of a blade fitting face, etc., and the assembly work by fastening bolt, etc., can thus be abolished and the propeller having less dislocation of the tip position of each blade after the combined assembly can be manufactured.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to the casting of large marine propellers, aircraft propellers, blower fans, etc., in which the shaft portions are made of the same or different materials. Regarding applicable cast-in type marine propellers.

[Conventional technology]

Figure 3.4 shows details of the structure and mounting state of a conventional assembled marine propeller.

In the manufacturing method of large propellers for ships in foundries that lack equipment capacity such as large castings, such as melting capacity, the boss B+ and the blade Yl are cast separately, and the boss B+ is attached to the blade mounting surface B2 and the tightening Machine the screw hole B3.

Similarly, the blade YI is connected to the mounting surface Y3 of the blade root Y2 and the tightening hole Y4.
machined.

Furthermore, the boss B1 and the wing Y+ are connected and assembled using a tightening bolt YS.

After that, the boss B+ and the entire concave portion B4 of the blade root Y2 are filled with cement or synthetic resin, and then molded and made.

[Problem to be solved by the invention]

In the prefabricated marine propeller described above, the blade mounting surface B2 and the tightening screw hole B3 of the boss B+ are machined, and each blade Y1 is similarly machined.
It is necessary to machine the mounting surface Y3 of the blade root Y2 and the tightening hole Y4, as well as to assemble them, and to manufacture parts such as the tightening port Y5. Further, since a recess B4 is generated on the outer periphery of the boss B+ and the blade root Y2, it is necessary to fill it with cement or synthetic resin and mold it.

Furthermore, machining errors (particularly angular errors) on the blade attachment surface B2 of the boss B+ and the attachment surface Y3 of the blade Y+ sometimes caused a large deviation in the position and pitch of each blade tip after assembly.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention positions and fixes a blade that has been manufactured as a single unit in the completed state to the lower mold of a boss mold, attaches a core and the same mold as the boss mold, and then pours molten metal into the boss mold. This is a marine propeller in which the boss and blades are integrated by injection into a mold. In other words, multiple blades with convex blade roots are positioned and fixed in the completed state to the lower mold of the boss mold that has been installed in advance, and then the core and the same mold are attached and melted into the created boss mold. Yakuchichi 4i is a casting-type marine propeller that is characterized by the ability to cast hot water.

[For production]

Since the cast-in type marine propeller of the present invention is manufactured as described above, each part is separately cast, making it possible to manufacture a large propeller in a foundry with a small melting capacity. This is a marine propeller that aims to improve machining accuracy by eliminating machine tool equipment and related work that does not require machining.

〔Example〕

Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings. FIG. 1 is a perspective view showing a partially cutaway cross section of a cast-in type marine propeller according to an embodiment of the present invention. FIG. 2 is a longitudinal cross-sectional view of a mold showing an integrated casting mode according to this embodiment.

The details are described below.

In Figure 1.2, 1 is a boss, 2 is a jig, 3 is a melting metal, 4 is a sprue, 5 is a runner, 6 is a core, 7 is a lower mold, 8 is an upper mold, 9 is a baseboard, 1o is up, 11 is the wing, 12 is the wing root,
13 is a convex portion, and 15 is a boundary portion.

Figure 1 shows a plurality of blades 11 that have been manufactured individually in advance, fixed in position around the lower mold of a boss mold (not shown) in a completed state, and molten metal poured after attaching a core and an upper mold (not shown). Then, the boss 1 and the blade 11 are solidified into one piece. Plus boss 1! The boundary part 15 with @11 is built up by welding (15)
This is a marine propeller with colored blades that have been molded smoothly. Next, the detailed structure and process of FIG. 1 will be explained with reference to FIG.
Since the convex part 13 is formed in the casting part 2 as shown in the figure, the casting part is cast with a concave part provided therein. In addition, the bosse is made of 6 wings 11 completed in advance with 7 centers of the lower mold of the boss mold.
are fixed on the jig 2 shown in the figure and the lower die 7 at equal pitches radially as shown in FIG. Next, attach the core 6 and the upper mold 8 of the boss mold with the baseboard 9 4
After installation, complete the boss 1 mold with the riser 10 provided in advance, and pour the molten metal 3 into the completed boss mold through the sprue 4 and runner 5.
The 6 wings 11 are made into the boss 1 by injecting and solidifying them through the
is integrally fixed to.

As mentioned above, a marine propeller with integrated boss 1 and six blades 11 is manufactured by forming a built-up part 15 by welding at the boundary between the blade root 12 and boss 1, and then smoothly molding it. This is a marine propeller in which the upper and lower ends of the boss 1 are completed by machining.

〔Effect of the invention〕

As specifically explained above, the cast-in type marine propeller of the present invention enables manufacturing of large propellers in a small-scale foundry with melting capacity, etc., and assembly by machining of the blade mounting surface, etc., and tightening ports, etc. It is possible to manufacture a marine propeller in which the work can be abolished and the position of the tip of each shaft after assembly is less likely to be misaligned.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a partially cutaway cross section of a cast-in type marine propeller according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of a mold showing an integrated casting mode according to the present embodiment, and FIG. 3 4 is a perspective view showing a partially cutaway cross-section of a conventional prefabricated marine propeller, and FIG. 4 is an enlarged view of section 3 in FIG. 3 showing how the boss and blades are attached. 1... Boss, 2... Jig, 3... Molten metal, 4...
・Spout, 5... Runway, 6... Core, 7... Lower mold,
8... Upper mold, 9... Skirting board, 10... Up, 11
... Wing, 12... Wing root, 13... Convex portion, 15.
... Boundary area. Shingetsu 4m for raft buried tomostone

Claims (1)

[Claims] After positioning and fixing multiple blades with convex blade roots in the completed state to the lower mold of the boss mold that was previously installed, the core and the same mold were attached, and molten metal was poured into the boss mold that was created. A cast-in type marine propeller that is characterized by being cast.