JPS5921692B2 - How to make a propeller wing model - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for manufacturing a wing model of a propulsion device, particularly a marine propulsion device.

Most of the materials used as wing models to obtain cast products for marine propulsors are wood, and when casting marine propulsors, the method of making the casting mold is (i).
There are various methods such as the cylindrical mold method, the G-eye mold method, and other methods, but a model is always required for each method.

The method of the present invention relates to an improvement in the method for manufacturing a wing model used in the method (ii) above.

An example of a method for manufacturing a conventional casting tool model for a marine propulsion device will be explained with reference to FIGS.
The base ends are overlapped as shown in Fig. 1, and the adjacent plates 1 are bonded together so that the overlapping lines are shifted appropriately toward the tip, and then the blade edges 2 are assembled as shown in Fig. The model is created by manually carving out the curved surface while checking against the design drawings. FIG. 3 is a diagram showing the piled-up state of the plate materials 1 in a cross section of the wing surface of the model, and the discarded shape, and 3 is the discarded shape, and 4 is a line showing the cross section of the model's wing. Normally, the propulsion performance of a propeller is greatly influenced by factors such as the angle from the center, the area of the blade, the smoothness of the curve, and the thickness of the blade.
Traditionally, when making casting models, special care must be taken, and not only does it require a high degree of skill to select the dryness of the wood used and the selection of materials that are less likely to deform. However, it requires a lot of work, and the completed model is very heavy, making it difficult to transport and handle.It also has the drawbacks of being easily deformed over time after completion and not being able to withstand long-term storage. Ta.

The present invention solves the drawbacks of the above conventional methods and is simple.

This was proposed for the purpose of providing a method for manufacturing an accurate propulsion device casting tool model that can be manufactured quickly, is lightweight, has minimal deformation, and can be stored for a long period of time. To do this, a large number of gauge plates with shapes corresponding to the curved surfaces of the blades of the thruster are placed on the top surface of the surface plate, and then foamed resin is placed between each of the gauge plates and in contact with the curved surfaces of each of the blades. Create a waste mold that is flush-embedded to form the blade curved surface of the propeller casting model, and then form the blade wall thickness of the propeller casting model on the blade curved surface of each gauge plate of the waste mold. After arranging and fixing the standard templates using reinforcing materials, foamed resin is embedded between each standard template, and the surface is finished along the curved surface of the standard template. The present invention also relates to a method for manufacturing a propeller wing model, characterized in that the entire surface of the model is coated with reinforced plastic and hardened. 4th below
The method of the present invention will be specifically explained with reference to FIGS.

In Figure 4, 5 is the surface plate that should be the reference, and the identification plate 5
As shown in the figure, a plurality of gauge plates 6 (six in this example) having curves for each cross-section of the back surface of the wing of the casting model of the thruster are arranged parallel to each other at equal intervals.

Reference numeral 7 denotes a curved surface formed on the upper end surface of these gauge plates, which is to become the wing surface (back surface) of the casting model of the thruster, and the curved surface 7 is processed according to a preset shape and dimensions. Ru.

8 shows the assumed line that will be the blade edge of the model of the thruster.

After a large number of gauge plates 6 are arranged in a predetermined manner on the surface plate 5 as described above, foamed resin 9 is embedded between each adjacent gauge plate 6, and its surface is aligned with the curved surface 7. After finishing, a mold is created that will become the back side of the blade for the casting model of the thruster. In this case, hard urethane resin is used as the foamed resin. A method of embedding this foamed resin 9 between adjacent gauge plates 6 and between reference templates 10 described later is as follows. A method of filling the gap while cutting and molding the foamed resin on-site may be to bring resin stock solution to the site, inject it into the gap, foam it, and cut off the excess with a knife. As shown in FIG.
A reference template 10 having the wall thickness of a wing of a casting model of a propulsion device is placed.

This reference template 10 is pre-processed to accurately represent the area of each cross-section of the wing of the casting model of the propulsion device 6 and to have finishing allowances. As described above, the reference plate 10
After each gauge plate 6 has been arranged on the curved surface 7. A reinforcing material 11 such as an iron rod or a wood rod is passed between each reference template 10 as shown in FIG. 5, and the reference templates 10 are fixed. Then, in the same manner as shown in FIG. 4, foamed resin 9 is embedded between adjacent reference templates 10, and finish cutting is performed along the curved surface 12 of the reference templates 10. Once the surface of the wing of the casting model has been completed, the surface is coated with reinforcing plastic. Surface coating with this reinforced plastic is done by applying a mixture of undiluted epoxy resin or polyester resin mixed with a curing agent to the surface of the model with a brush6, covering it with glass fiber, etc., and then applying the undiluted solution over it. Repeat this process 2 to 3 times to form a coating with a thickness of 2 to 3 mm, and then leave it for 6 hours to cure and obtain a strong coated surface. The state of the model completed in this way will be explained with reference to Figs. 6 and 7. Fig. 6 is a sectional view taken along the center line of the blade of the thruster, 613 is the blade edge, and 14 is the reinforced plastic surface. The layers are shown at 615, a re-foamed resin, and 16, an iron rod or wood rod serving as a reinforcing material.

Figure 7 is a cross-sectional view of the model wing seen in the direction perpendicular to Figure 6.
4 is a reinforced plastic layer, 15 is a foamed resin layer. 16 indicates a reinforcing material. 6 In short, the present invention is as follows. To manufacture a casting model of the thruster, a large number of gauge plates with shapes corresponding to the curved surfaces of the blades of the propeller were arranged on the surface plate, and then 6 pieces of foamed resin were placed between each gauge plate. 6. Make a waste mold that is embedded flush with each of the blade curved surfaces to form a blade weight surface of a model for casting a propeller, and then place a mold for casting a propeller on the blade curved surface of each gauge plate of the waste mold. A reference template for forming the wing thickness. After arranging and fixing through the reinforcing material, foamed resin is embedded between the standard templates, its surface is finished along the curved surface of the standard template, and reinforced plastic is coated and hardened on the entire surface. Since the gist of this article is a method for manufacturing a propeller wing model featuring the following,
According to the present invention, 6(1) Compared to the conventional method, the number of man-hours required for manufacturing a blade model for casting of a propulsion device is small, and it can be manufactured simply and quickly without requiring much labor.

(2) Most of the mold is made of lightweight foamed resin. The weight of the model can be significantly reduced compared to conventional models. It is easy to handle and can significantly reduce material costs.

(3) Since a strong covering surface is formed on the surface of the model by reinforced plastic, and the main part is formed of foamed resin, deformation after 6 hours is significantly less than before, and it can be stored for a long time.

(4) Unlike conventional methods, there is no need to pay much attention to the degree of dryness or selection of materials, so manufacturing does not require a high degree of skill. The following practical effects can be mentioned.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1, 2 and 3 are schematic illustrations of an example of a conventional manufacturing method. FIGS. 4 and 5 are schematic illustrations of an embodiment of the method of the present invention. These are schematic explanatory diagrams: FIG. 4 is an explanatory diagram of the arrangement of gauge plates, FIG. 5 is an explanatory diagram of the arrangement of reference templates, and FIG.
7 is a schematic explanatory diagram of a model completed according to the present invention, 6. FIG. 6 is a sectional view taken along the center line of the propeller blade, and FIG. 7 is a sectional view taken along the line A--A in FIG. 6. In Figures 4 to 7, 6 5... surface plate, 6... cage plate, 7... wing curved surface 68
...Estimated wing edge line. 9... Foamed resin 610... Reference template, 11... Reinforcement material, 12... Curved surface of reference template,
13... Wing edge, 14... Reinforced plastic layer, 15
... Foamed resin, 16... Reinforcement material.

Claims (1)

[Claims] 1. When manufacturing the casting model of the thruster, on the surface plate,
After arranging a large number of gauge plates with shapes corresponding to the curved surfaces of the propeller's blades on the top surface, foamed resin is embedded between each gauge plate so that it is flush with the curved surfaces of each of the blades, and the propeller is cast. A waste mold for forming the wing curved surface of the model for use is made, and then a reference template for forming the wing thickness of the model for propulsion casting is placed on the blade curved surface of each gauge plate of the waste mold via a reinforcing material. A propeller blade characterized in that after the arrangement and fixation, foamed resin is embedded between each reference template, the surface is finished along the wing curved surface of the reference template, and the entire surface is coated and hardened with reinforced plastic. How to make a model.