JPH04146110A - Molding method for test model - Google Patents

Abstract

PURPOSE:To facilitate molding of a transparent test model in a short time and inexpensively, by a method wherein the transparent test model is molded by making use of a casting mold of a casing for trial production to investigate movement of a liquid within the casing. CONSTITUTION:The other gas leaking positions 9, 10 of a pair of molds 1, 2 to be used for casting molding of a metallic material constituting a casing area sealed with a sealer except for their casting position 7. Then a mold release film 15 is applied to cavity surfaces 3, 4 and mold making where those molds are integrated by joining to each other is performed. Then a transparent resin material is cast into the cavities of the molds, heated and cured, through which a test model is molded. The mold release film 15 is removed from the surface of the demolded test model, then liquid transparent resin 18 is applied to its surface and the test model W is finished transparently. With this construction, the test model can be made transparent completely and movement of a liquid on the inside is visually confirmed and achieved thoroughly, which can be provided for concept of a design.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of forming a transparent model for testing purposes used to examine the properties of liquid within a casing.

(Prior Art) The quality of the lubricity of oil is an important factor that influences the performance and durability of engines, transmissions, etc. For this reason, this type of test generally uses a transparent model made from a plastic silicone mold of the same shape as the offering, and a method is used in which oil is sealed and its behavior is visually observed from the outside. ing.

However, since such lubricity tests and adjustments to oil flow, etc. based on these tests are carried out at the final stage of development, creating a new mold for the test model for this purpose takes time during the development period. This is not necessarily a good idea as it may unnecessarily prolong the process or increase development costs unnecessarily.

On the other hand, as another means of investigating the behavior of oil, a testing method has been used in which one side of a prototype casting is scraped off and the behavior of the oil inside is visually observed through a transparent plate attached to it. This method has the advantage of being able to mold test models in a relatively short period of time and at low cost, but on the other hand, models made in this way can only observe the behavior of the liquid from one side. Because it can't be done like a crank case etc.? ! ! In the case of rough objects, the oil lubrication state on curved surfaces and corners can only be partially seen, which poses a problem in arranging oil regulating ribs and the like in appropriate positions.

(Problems to be Solved by the Invention) The present invention was made in view of the above problems, and its purpose is to provide a transparent test that allows the behavior of the liquid inside to be completely visualized. Our objective is to propose a new molding method that allows models to be molded in a short period of time and at low cost.

(Means for Solving Task I!) That is, the present invention provides a method for forming a test model to achieve the above object by pouring molten metal into a pair of molds used for casting metal materials. The mold making preparation process involves sealing other gas leakage points with a sealant using a sealant, and then applying a mold release film to the carrier and tee surfaces to combine these molds into one, and the cavities of these molds. A molding process in which a transparent resin material is injected and heated to harden to form a test model, and a mold release II is removed from the surface of the templated test model, and then a liquid transparent resin is applied to the surface to make the test model transparent. It consists of a finishing process to finish the product.

(Embodiment) A molding method according to an embodiment of the present invention will be described below with reference to the drawings.

This molding method is characterized by molding a transparent test model using a prototype casting mold. To explain the casting mold used in this method with reference to FIG.
For example, cavity 3, which forms the molding surface of an engine case, is located at L.
．． 4 is molded into a male core and a female core, these are
As is well known, the mold plate 5 and the movable mold plate 6 are fitted and fixed on each joining surface side. A runner 8 communicating with the cavity 3.4 via the gate 7 is formed on the joint surface PL of this core 1, and a pair 1! of this runner 8! In this case, a gas vent hole 9 is formed, and a plurality of through holes 1o, 1 are formed from the movable mold plate 6 to the cavity 4 of the female mold core 4.
0 is provided, and the ejector plate 11 is provided here.
An ejector fin 12, which operates integrally with the ejector fin, is slidably inserted therethrough.

Next, we will explain how to mold a test model using this mold!
To explain with reference to FIG. 1, this molding method is roughly divided into a mold making preparation step (I), a molding step (II), and a finishing step (III).

゛; In this process, the mold core 1 and the female core 2 are fixed on the mold plate 5.
and removed from the movable mold plate 6, and each through hole 1 of the female mold core 2
o, 10, push silicone rubber or resin Zamaru Keyaki plugs 13.13 to a certain depth L from the rear and tee 4 sides respectively, and then add one layer of epoxy resin (Ciba Geigy Co., Ltd. XN 1023) or Fill with thermosetting resin 14.14 for resin models that hardens in two parts, such as polyester resin (Soda Kagaku PR materials, Moriyama Shokai M-Resin) so that it is on the same surface as the surface of cavity 4. Molding Cl-1).

Next, except for the gate 7, seal all holes from which air may leak when the two cores 1.2 are joined, such as the gas vent hole 9, and then seal the sides of both cavities 3.4: C
Apply an organic solvent-based mold release agent such as IBA7 Lardite QZ-NB (trade name) by spraying or brushing to release the mold @ 151Fr, and then place both cores 1.2 and 1.2 by surrounding the gear and tee 3.4jv. The joint surface PL of either one of
A seal 16 is applied to the cores 1.2 to join them together, and then the runners 8 of the joined cores 1.2 are surrounded by a seal 16 to prevent hot water from overflowing. Preparation for forming and mold making V! Finish (I-3).

[Next, a transparent resin material for a test model is flowed into the gear and tee 3.4 from the runner 8 portion of both cores 1.2 which are thus combined and integrated (II-1).

As this resin material, it is possible to use urethane resin or other appropriate transparent resin material depending on the test model.
When using an engine or transmission case as a test model, it has high strength and hardness, excellent heat resistance and oil resistance, good transparency and machinability, and has a lower coefficient of thermal expansion than aluminum alloy. Araldite XNR6301 (main agent) and XNH6301 (curing agent) with small difference in
(Nippon Ciba Gaiki Co., Ltd.) A transparent epoxy resin material mixed in a ratio of tloO.40 is used.

After injecting this resin material, next core 1.2
18: Pour into vacuum chamber 20 and reduce to 68 to 70%
Leave the chamber 20 in a vacuum for at least 30 minutes with the vacuum pump P operating at a capacity of
The air remaining in the cavity 3.4 is released from the gate 7 to the outside (II-2).By the way, when this residual air leaks out from the runner 8, a part of the injected resin material is released from the gate 7. Will it overflow outside the runner 8 along with the air?
As described above, since the barrier 17 is provided in this part, overflow of the resin can be suppressed in this part.

After completing the above processing, the core 1.2 is transferred to a constant temperature chamber 21 and left in this chamber 21 maintained at 40 to 60°C for about a day and night to harden the resin inside (
II-3).

After the resin has hardened, divide these cores 1.2 and roughly insert the ejector bin 12.12 into the through hole 10.1o of the female core 2. Molded test model Wv! Separate and take out from female core 2 (III-
1). During this eject operation, the female core 2 may be attached to the die-casting to separate it from the test model wt female core 2, or the model W may be struck with a copper hammer from the back of the ejector plate 11. However, as described above, since the plugs 13.13 are pushed into the through holes 10.10 to a certain depth, the ejector holes 1 can be separated from the female core 2.
2, the test model W is extruded with a constant pressing force by receiving these resistances, and the test model W is separated from the female mold core 2 without cracking or deforming the test model W.

From the test model W that was released from the mold in this way, the gate part was first removed by contouring, etc., and then the surface was lightly sandblasted or peeled with paper to remove the mold release 11115. be done (II
I-2).

Finally, a transparent clear or transparent liquid resin 18 is applied with a brush or the like to the surface of the test model W, which has lost its transparency like spider glass due to this treatment (III-3). As shown in the figure, the fine irregularities Wf are filled with the transparent liquid resin 18, forming a welt as if wood were attached to the surface of spider glass and becoming transparent, allowing the behavior of the oil inside to be seen through without any hindrance. Processed to obtain.

Therefore, the test model W formed in this way
If the engine is installed with the clutch case and oil is injected into the engine and the engine is started, the behavior of the oil that begins to flow along with the clutch case can be seen and understood completely, and based on this, it is possible to detect poor lubricity. Ribs etc. can be attached to the parts appropriately.

In the embodiment described above, the core 1.2 after pouring is moved into the vacuum chamber 20 to exhaust the residual gas in the cavity, and then the core 1.2 is moved to the constant temperature chamber 21 to perform the resin effect. Although the molding procedure tm is such as to
After the gas in the chamber and tee is discharged, the molten metal may be injected into the cavity using a pouring nozzle from outside the chamber 20. Generally speaking, this vacuum chamber 20 is equipped with a heater, and the It is possible to perform all the molding processes from pouring to hardening, or in general,
If the effect processing is performed outside the vacuum chamber 20, a plurality of model moldings can be performed in parallel.

(Effects) As described above, according to the present invention, a casting mold is used, the gas leakage points of the mold are sealed, and a transparent resin material is injected into the cavity, so that the product is Not only can test models with the same shape be molded easily in a short period of time, but it also prevents the formation of unnecessary protrusions such as scratches on the surface, making finishing processing after mold release easier. It is possible to prevent the formation of partially opaque areas.

Moreover, since we applied liquid transparent resin to the surface after removing the mold release film, we were able to create a wetness on the opaque surface and make the test model completely transparent, allowing us to control the behavior of the liquid inside. Visually grasp everything thoroughly and use it for design consideration.

[Brief explanation of the drawing]

Figures 1 (I) to (III) are process diagrams showing one embodiment of the method of the present invention, and Figure 2 is a diagram showing an example of a casting mold used in this method. 1...Male core 2...Female core 3.
4...Cavity 8...Runner 9...Gas vent hole 10...Through hole 12-...Edge exhaust hole 13-...Plug 5...Mold release film 8...Liquid transparent resin agent 1.・・Thermostatic chamber 17・・Seki 20−・・Vacuum chamber W・・Test model

Claims (1)

[Claims] For a pair of molds used for casting and molding metal materials, gas leakage points other than the pouring point are sealed with a sealant, and then a release film is applied to the cavity surface. a mold-making preparation step in which the two molds are combined and integrated; a molding step in which a transparent resin material is injected into the cavity of the mold and cured by heating to mold a test model; and a surface of the test model after being released from the mold. Remove the release film from the
A method for molding a test model, comprising: a finishing step of applying a liquid transparent resin to the surface of the test model to make the test model transparent;