JPH0824995B2 - Disappearance model assembly method for casting - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vanishing model assembling method for casting for finishing the assembling of a vanishing model used for casting.

(Prior Art) When casting is performed using a vanishing model, even complicated shapes can be easily cast. However, in order to create this vanishing model, in the case of a complicated shape, the divided parts are formed, and these are stuck together to obtain the desired shape.

Since the vanishing model is molded of expanded polystyrene or the like, there are places where rigidity is weak in detail. Since the bonding of such places is easily deformed, an adhesive device is used to prevent the disappearing model from being deformed. For example, V. from Acco Babcock.
Production Systems for lost foamca by H. Burchell
A device is disclosed which attaches the split model (upper and lower) of the vanishing model to the sting, and is also disclosed in Japan.
Japanese Patent Laid-Open No. 61-169134 and Japanese Patent Laid-Open No. 61-169134 disclose a bonding device.

For example, in the bonding apparatus shown in FIG. 8, an automatic applicator 2 provided at the tip of the adhesive supply pipe 1 is positioned above the split model 5a supported by the robot 3 and held by the mold 4a to apply the adhesive. Waiting to do. The mold 4a is placed on the plate 6 and is movable below the cylinder 7. 4b is a split model
It is a mold that holds 5b, and a cylinder 7 through a plate 8.
It is fixed to. Also, a decompression pipe 9 is attached to each mold 4a, 4b.
Is installed.

The divided model 5a is put into the mold 4a and the inside of the mold 4a is decompressed by the decompression pipe 9, so that the divided model 5a is fixed to the mold 4a. Also, the split model 5b is similarly fixed to the mold 4b. Then, when an adhesive is applied to the divided model 5a and moved to the lower side of the cylinder 7, the cylinder 7 descends and the divided models 5a and 5b are bonded to each other to form a disappearing model 10.

(Problems to be Solved by the Invention) However, since the adhesive to be used is thermoplastic and is melted and applied, it is necessary to finish the work within a time until it cools and solidifies. Since the water-soluble coating agent is applied, it is necessary to apply the adhesive agent without leaving a gap so that the coating agent does not enter the adhesive surface.
If the time from application to pasting (hereinafter referred to as open time) becomes long, the adhesive strength will decrease, so apply the adhesive in a heating atmosphere, or apply once and then reheat while moving. (See FIG. 8, arrow H). However, when the coating amount is large, remelting takes time. Also, the open time is about 15 seconds, and it is necessary to fit within 10 seconds after the end of heating. Furthermore, when trying to secure the desired adhesive strength, the adhesive is
It must be applied to a thickness of about 0.2 mm, but in this case, it takes time for the thermal decomposition of the adhesive during casting, the flow of the molten metal is obstructed, and the casting quality deteriorates.

In order to solve the above problems, the present invention not only establishes a bonding method that does not affect the open time of the adhesive, but also prevents the infiltration of the coating agent into the bonding interface and prevents the molten metal from the adhesive. An object of the present invention is to provide a method for assembling a vanishing model for casting, which prevents deterioration of flow.

(Means for Solving Problems) In order to achieve the above-mentioned object, the present invention provides a split model 12,1.
Applying a water repellent agent 14 such as silicone oil to the opposing joint surfaces 12a and 13a of 3 and bringing the joint surfaces 12a and 13a into close contact with each other via the water repellent agent 14, along the edges of the joint surfaces, in advance or After joining, the adhesive 15 or an adhesive tape is applied or attached to integrate the divided models. It is characterized by the following.

(Operation) According to the above method, a layer of the water repellent is formed on the joint surfaces of the split models 12 and 13, and the adhesive 15 or the adhesive tape supports the split models 12 and 13 around the joint surfaces to form a single piece. The detailed model 11 is assembled.

(Example) An example of the present invention will be described with reference to Figs.

A detailed model 11 for explaining the method of the present invention has a cylindrical shape in the drawing, and includes a split model 12 and a split model 13. The respective joint surfaces 12a and 13a are on a single plane and are coated with silicone oil 14 or the like (water repellent). Next, the bonding surfaces 12a and 13a are brought into close contact with each other, and this close contact state is maintained,
Apply adhesive 15 to the outer periphery including the edges of the joint surface and divide into 12
And the split model 13 are integrated. In this way, sufficient adhesion can be achieved without being affected by open time. Then, each divided model is fixed with an appropriate strength by the adhesive and is stable even when the molten metal is poured, and since there is no adhesive on the joint surface, the molten metal flow is not hindered. Further, since the water repellent 14 is present on the joint surface, the coating agent does not enter the joint interface.

FIG. 4 shows the second embodiment. The joint surfaces of the split models 16 and 17 are provided with tapered surfaces 16a17a at the edges of the joint surfaces, and the adhesive 15 can be applied in advance. The number of processes can be reduced without affecting the open time.

FIG. 5 shows the third embodiment in which the split models 18, 19, 20 are joined surfaces 18
Follow the assembling method when a, 19a, and 20a overlap. The split model 18 and the split model 19 are joined to each other at their joint surfaces 18a,
The water repellent 14 is applied to 19a to make them adhere to each other, and the split model 20 is attached so as to cover this joint surface.
Stick with adhesive so that it adheres to 18,19.

6 and 7 show the embodiment of FIG.
According to the assembling method in the case where the joint surfaces 21a, 22a of the split model 22 and the split model 22 have the step 23. A layer of the water repellent agent 14 is formed on the joint surface between the divided models 21 and 22, and an adhesive is spotted along the joint surface. If you cannot attach dots
As shown in FIG. 1, it adheres on the boundary line along the joint surface.

Here, the thickness of the water repellent may be 50 μm or less, which does not hinder the flow of the molten metal. In addition, for the adhesion of the divided models, an adhesive tape may be used instead of the adhesive in each of the above embodiments.

(Advantages of the Invention) The present invention can easily and surely bond the split model without being affected by the open time, and can reliably prevent the coating agent from entering the bonding interface by the water repellent. Moreover, since the adhesive that obstructs the molten metal flow from the joint surface is eliminated, the casting quality is greatly improved.

[Brief description of drawings]

FIG. 1 is an embodiment of the present invention and is a side view of a vanishing model for the method. 2 is a sectional view in the direction of the arrow II in FIG. 1, FIG. 3 is a sectional view in the direction of the arrow III in FIG. 2, and FIGS. 4 and 5 are sectional views of the essential parts of other embodiments, and FIG. The figure is another embodiment, a side view of the main part, FIG. 7 is a cross-sectional view of the arrow VII along the joint surface of FIG. 6, and FIG. 8 is a conventional split-molded disappearance model joining device. 12, 13 …… Split model, 14 …… Water repellent 15 …… Adhesive

Claims (1)

[Claims] 1. A water-repellent agent is applied to opposing joint surfaces of a split model to bring the joint surfaces into close contact with each other via the water-repellent agent, and the adhesive is adhered along the edges of the joint surfaces in advance or after the close contact. Alternatively, a disappearing model assembling method for casting, characterized by applying or sticking an adhesive tape to integrate the divided models.