JPS6035020B2 - How to make a model for flow test - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to hydrodynamic test models such as scale model ships, marine structure models, and model rudders that are used for tests and experiments in, for example, ship test tanks. Concerning how to produce.

[Successful technology]

The above-mentioned hydraulic test model is required to have high manufacturing accuracy in its size and shape, and a low deformation rate with respect to temperature. Normally, these materials were manufactured using a single material, but not only were these materials themselves extremely expensive, but their hardness and weight were large, requiring a great deal of labor to transport the materials and make the models. It takes a long time and the finished model is necessarily heavy, which requires a lot of effort in testing and experimentation. In addition, it is becoming common to use panels made of foamed resin that have a small deformation rate with respect to temperature to produce models for flow tests.

Conventionally, a flow test model using the above-mentioned foamed resin panel has been manufactured using the following procedure.

That is, {i} First, as shown in Figure 2 A, a core body a (this example shows a core body a for making a model ship for hull form testing) is made of wood such as plywood, and then (ii) As shown in Figure 2, a plurality of foamed resin panels of the size and shape necessary to manufacture a model ship of a desired size and shape are made from relatively thick foamed resin panels b available on the market. Then, as shown in FIG. 2C, each of the cut out foamed resin divided members c... is pasted on the surface of the core body a through the saddle adhesive d. Add, (iv}
Then, as shown in FIG. 2, after the adhesive d has hardened and all the foamed resin segmented members c... have firmly adhered to the surface of the core body a, the foamed resin segmented members c.・
The surface of . Finally, as shown in FIG. 2, the hardened surface of the model prototype e was polished for precision finishing.

[Problem that the invention seeks to solve]

However, even in the above-mentioned conventional method of manufacturing a flow test model made of foamed resin, it is considerably cheaper than the conventional method of manufacturing using a single material selected from wood, aluminum, paraffin, etc. In addition, although the model can be manufactured relatively easily and in a short time, and the finished model is light, tests and experiments can be easily performed with little effort. This requires a considerable amount of effort and time, and there is considerable room for improvement.

That is, in order to create the core body a in the step 'i} above, it is necessary to cut out wood such as plywood into a predetermined shape and assemble it, and in the step {ii) above, When cutting out a plurality of foamed resin divided parts c... of the required shape from the foamed resin panel b of , there is a lot of waste as incomplete parts inevitably come out, and there is an economical disadvantage, and when the cutting work is carried out, In order to avoid mistakes in the size and shape of the foamed resin dividing member c... to be cut out, careful attention must be paid not to make mistakes in the size and shape of the foamed resin dividing member c... Since it is necessary to finish the parts that support each other with sufficient precision so that there are no gaps, this work is still quite troublesome and takes time. There remains the disadvantage that it takes a considerable amount of effort to attach the divided members c... to the core body a without any gaps. The various disadvantages of such conventional methods become greater as the shape of the model to be manufactured becomes more complex. On the other hand, no matter how it is produced,
For example, hydraulic test models such as ship type test model ships are manufactured for tests or experiments that correspond to specific actual objects, so once they have been used for that test or experiment, Since it is normal that it is never used again, and the shape of the test model for hydrodynamic testing is usually kept highly confidential, it cannot be discarded outside without thought, and it is kept for a long time. The reality is that a large number of used hydraulic test models of similar size and shape are left piled up in a test site or field for a long time.

It is clear that this problem involves not only the problem of simply having trouble finding a place to store or dispose of used hydraulic test models, but also the problem of large waste of materials. The present invention has been made in view of the above circumstances, and its purpose is to effectively recycle used and unnecessary hydraulic test models, thereby making it much easier and faster than before. The objective is to be able to manufacture a desired hydraulic test model in a timely and economical manner, and to minimize the generation of discarded hydraulic test models that require a large storage space and result in a large waste of materials. . [Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for manufacturing a hydraulic test model having a desired size and shape. By cutting the surface of an unnecessary flow test model having a similar size and shape to the above, a core body having a similar shape to the desired shape and slightly smaller than the desired size is created, next,
A foamed resin stock solution made by mixing a foaming agent with a resin stock solution is attached to the surface of the core before foaming is completed, and then, after the foamed resin stock solution is foamed and solidified on the surface of the core, The surface of the foamed solidified resin is substantially shaped into the desired size and shape to produce a model prototype, then the surface of the model model is impregnated with a curing agent to harden the surface, and finally, It is characterized by the fact that it adopts a procedure in which the hardened surface of the model prototype is polished for precision finishing.

[Effects] The effects achieved due to this characteristic configuration are as follows. In other words, in the conventional manufacturing method of the foamed resin model for flow test, a core body is assembled by cutting out wood such as plywood into a predetermined shape. When creating a hydraulic test model, in the method of the present invention, an unnecessary hydraulic test model having a similar size and shape to the hydraulic test model to be manufactured is effectively used, and a similar hydraulic test model is used. Since a very simple method of cutting the surface of the model is used, the core can be created with almost no material cost, and can be done extremely easily and in a short time.

'B-Also, when manufacturing the model prototype, as in the conventional manufacturing method of the foam resin flow test model described above, a plurality of foam resin segments of the required shape are carefully cut out from a commercially available foam resin panel. Instead of cutting out, forming, and carefully pasting the plurality of foamed resin segments onto the surface of the core using an adhesive, which is a laborious process that tends to result in a lot of material waste, the method of the present invention employs a very simple method of directly attaching the foamed resin stock solution to the surface of the core body, which was created by cutting the surface of a similar flow test model as described above, and allowing it to foam and solidify. Therefore, the model prototype can be produced extremely easily and in a short time without wasting materials.

(C} In addition, as mentioned above, the core body to which the foamed resin stock solution is attached should have a shape similar to the desired shape of the flow test model to be manufactured, and a size slightly smaller than the desired size. Since the foamed resin stock solution is prepared in a very small amount, the amount of the foamed resin stock solution used can be extremely small, and from this point of view as well, a significant reduction in material costs can be achieved.

'D} Furthermore, when creating the core body as mentioned above, we make effective use of the unnecessary flow test models, so there is a large amount of waste in terms of materials, and there is no need to store or dispose of them. It is possible to effectively solve the problems associated with the flow test, and also to reduce the risk that the highly confidential shape of the unnecessary fluid test model will be leaked to the outside.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described based on the drawings.

FIG. 1 shows the process of manufacturing a model ship for hull form testing having a desired size and shape by applying the method for manufacturing a model for hydrodynamic testing according to the present invention. The procedure is as follows. 1. First, as shown in Figure 1A, from among the ship test model ships that are no longer needed due to plans for scrapping, etc., select one that is similar in size and shape to the desired size and shape of the ship test model ship to be manufactured. Select and prepare a model ship 1 for ship type test having a shape and shape.

The model ship 1 for testing similar ship types is preferably made of foamed resin, but it may also be made of wood. 0 Next, as shown in Figure 1, by cutting the surface of the hydraulic test model 1, a core body 2 having a shape similar to the desired shape and slightly smaller than the desired size is obtained. create.

m Subsequently, as shown in FIG. 1C, a polyurethane stock solution as an example of resin stock solution A and ether as an example of foaming agent B are mixed to make a foamed polyurethane stock solution as an example of foamed resin stock solution C. .

W Then, as shown in FIG. 12, an appropriate amount of the foamed resin stock solution C is deposited on the surface of the core body 2 by coating or spraying before foaming is completed.

V Thereafter, as shown in FIG. 1, after the foamed resin stock solution C is foamed and solidified on the surface of the core body 2, the surface of the foamed and solidified resin is substantially shaped into the desired size and shape. Then, model prototype 3 is manufactured.

W Subsequently, as shown in FIG. 1, the surface of the model master 3 is impregnated with a curing agent 4 by spraying or coating to harden the surface.

Skin Finally, as shown in Figure 1, the hardened surface of the model prototype is polished for a precision finish.

In addition, in the step (0), the core body 2 after the foamed resin stock solution C is foamed and solidified in the subsequent step (V).
In order to ensure more reliable and strong adhesion to the surface, it is desirable to cut the surface of the core 2 so that the cut surface becomes a rough surface.

Further, in the step (m), the resin stock solution A may be other than a polyurethane stock solution, and the blowing agent B may be other than ether.

The mixing ratio of the resin stock solution A and the blowing agent B is not particularly limited, and may be adjusted as appropriate depending on the size and purpose of the model to be manufactured. For example, in the case of a model ship made of polyurethane foam before and after 2 for an ocean current aquarium,
If a foamed polyurethane stock solution having a foaming rate (the ratio of the volume after foaming to the original volume) of about 10 to 2 pm is used as the foamed resin stock solution C, a foamed polyurethane stock solution with appropriate hardness can be obtained. In addition,
The method of the present invention described above is applicable not only to model ships for ship type tests, but also to general models for hydrodynamic tests that are subjected to tests in test tanks, wind tunnels, etc., such as marine structure models, model rudders, model wings, etc. can do.

〔Effect of the invention〕

As is clear from the detailed description above, according to the method for manufacturing a hydraulic test model according to the present invention, an unnecessary hydraulic test model can be effectively recycled for producing a core body, and Since the model prototype is manufactured by a very simple method of directly applying the foamed resin stock solution to the surface of the core body and foaming and solidifying it, it is much easier and shorter than the conventional method. Moreover, it has various excellent features such as not only being able to manufacture the desired hydraulic test model economically, but also minimizing the generation of discarded hydraulic test models that require a large storage space and lead to a large waste of materials. The effect is demonstrated.

[Brief explanation of the drawing]

FIGS. 1A to 1E are process diagrams showing the steps of a specific embodiment of the method for manufacturing a hydraulic test model according to the present invention. -Furthermore, FIGS. 2A to 2A are process diagrams showing the steps of an example of a conventional method for manufacturing a hydraulic test model. 1... Model for fluid test that is no longer needed, 2...
...Mind-body, 3...Model prototype, 4...
Curing agent, A... Resin stock solution, B... Foaming agent,
C: Foamed resin stock solution. Figure 1 Figure 2

Claims (1)

[Claims] 1. A method for manufacturing a hydraulic test model having a desired size and shape, which first involves manufacturing an unnecessary hydraulic test model having a similar size and shape to the desired size and shape. By cutting the surface, a core body having a shape similar to the desired shape and slightly smaller than the desired size is created, and then a foamed resin stock solution prepared by mixing a foaming agent with the resin stock solution is foamed. Then, after the foamed resin stock solution is foamed and solidified on the surface of the core, the surface of the foamed and solidified resin is substantially adjusted to the desired size and shape. A procedure of manufacturing a model prototype by shaping it into a shape, then impregnating the surface of the model prototype with a hardening agent to harden the surface, and finally polishing the hardened surface of the model prototype for precision finishing. A method of manufacturing a model for a flow test, characterized by: