JPH01130835A - Lost-wax pattern assembly method for casting - Google Patents

Abstract

PURPOSE:To prevent the flow of an adhesive into the molten metal passage and to improve the molten metal flow by adhering a joining face by coating a water repellent on the relative joining face of a split pattern and integrating the split pattern by coating the adhesive along a joining boundary line. CONSTITUTION:The water repellent 14 of a silicone oil, etc., is coated on the respective joining face 12a, 13d of split pattern 12, 13. An adhesive 15 is adhered to the boundary line running along the joining face after sticking the split patterns 12, 13. Each split pattern 12, 13 is therefore fixed by the adhesive 15, stabilized even in case of flowing a molten metal and the flow is not interrupted. A tacky tape may be stuck instead of the adhesive 15.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for assembling a vanishing model for casting to complete the assembly of a vanishing model used for casting.

(Prior Art) When casting is performed using a vanishing model, even objects with quite complex shapes can be easily cast.

However, in order to create this disappearing model, in the case of complex shapes, the parts are molded and then glued together to obtain the desired shape.

Since the vanishing model is made of foamed polystyrene or the like, there are some parts with weak rigidity in the details. Since bonding at such points is easy to deform, an adhesive device is used to prevent the disappearing model from deforming. For example, Acco Babco
Produc by V, H, Burchell of ck company
tion Systems for 1st foa
Partial molding of the disappearing model in mcasting (above).

(lower) was disclosed, and also in Japan, Japanese Patent Application Laid-Open No. 81-189133 and Japanese Patent Application Laid-Open No. 1891-18913
No. 4 discloses an adhesive device.

For example, the adhesive device shown in FIG.
An automatic coating machine 2 provided at the tip of the machine is positioned above a split model 5a supported by a robot 3 and held by a mold 4a, and is waiting to apply adhesive. The mold 4a is placed on the plate 6 and can be moved to below the cylinder 7. 4b
is a mold for holding the divided model 5b, and is fixed to the cylinder 7 via a plate 8. In addition, each type 4a, 4b
A decompression pipe 9 is attached to the.

Put the split model 5a into the mold 4a and use the decompression pipe 9 to remove the mold 4a.
The divided model 5a is fixed to the mold 4a by reducing the pressure inside. Furthermore, the divided model 5b is similarly fixed to the mold 4b.

Then, when the divided model 5a is coated with adhesive and moved below the cylinder 7, the cylinder 7 is lowered and the divided model 5a,
5b are pasted together to complete the disappearing model IO.

(Problems to be Solved by the Invention) However, since the adhesive used is a thermoplastic adhesive that is melted and applied by heating, it is necessary to complete the work within the time it takes for the adhesive to cool and harden. Furthermore, since a water-soluble molding agent is applied after adhesion, it is necessary to apply the adhesive without gaps so that the molding agent does not penetrate into the adhesive surface. For this reason, if the time from application to bonding (hereinafter referred to as open time) is long, the adhesive strength will decrease. Methods such as reheating (arrow H in Figure 10) were used. However, if the amount of coating is large, it takes time to remelt. Further, the open time is about 15 seconds, and it is necessary to bond them together within about 10 seconds after heating is completed. Furthermore, if the adhesive has low viscosity, it will flow downward if there is a vertical portion on the bonding surface, reducing the adhesive effect by half. and,
If the adhesive strength is strong (adhesive layer of 0.1 to 0.2 cm or more), the flow of the molten metal may be impaired.

In order to solve the above-mentioned problems, the present invention aims to provide a method for assembling a vanishing model for casting, which does not affect the open time of the adhesive and can be bonded even on vertical joint surfaces. .

(Means for Solving the Problems) In order to achieve the above object, the present invention uses a one-part model 12.
A water repellent agent 14 such as silicone oil is applied to the opposing joint surfaces 12a and 13a of the joint surfaces 12a and 13a.

13a are brought into close contact with each other, and an adhesive 15 or adhesive tape is applied or pasted along the boundary line of the joining surfaces in advance or after joining, and the split models are assembled into one body.

(Function) According to the above method, a layer of water repellent is formed on the joint surface of the one-piece model 12.13, and the adhesive 15 or adhesive tape supports the divided model 12.13 around the joint surface. The missing model 1'l is assembled.

(Example) Embodiments of the present invention will be described based on FIGS. 1 to 3.

A disappearing model 11 for explaining the present invention in detail has a cylindrical shape in the figure, and is composed of a divided model 12 and a divided model 13. Each joint surface 12a, 13a is on one plane and is coated with silicone oil 14 or the like (water repellent). Then, an adhesive 15 is applied to the boundary line along this joint surface after the divided models 12 and 13 are pasted together. In this way, sufficient adhesion can be achieved without being affected by open time. Each segmented model is fixed with appropriate strength by the adhesive, and is stable even when molten metal is poured into it, without interfering with the flow.

FIG. 4 shows the second embodiment, which is a divided model 1G.

The joint surface of No. 17 has a tapered surface lea on the edge of the joint surface.

+7a is provided, and adhesive 15 can be applied in advance. The number of processes can be reduced without affecting open time.

FIG. 5 shows a third embodiment in which the assembled models 1319 and 20 are assembled according to the method when they overlap at the joint surfaces 18a, 19a, and 20a. The split model 18 and the split model 19 are bonded by applying water repellent 14 to their joint surfaces 18a and 19a, and the split model 20 is attached to cover the joint surfaces, and the split model 20 is attached to the split model 18. Attach it with adhesive so that it sticks to 19.

FIGS. 6 and 7 show a fourth embodiment, in which the 0-split model 21 and the split model are assembled according to the method when the joint surfaces 21a and 22a of the split model 21 and the split model 22 have steps 23. A layer of water repellent agent 14 is formed on the joint surface with 22, and adhesive is dotted along the joint surface. If spot bonding is not possible, bond on the boundary line along the joint surface as shown in Figure 1.

Figures 8 and 9 show a fifth embodiment, in which the 0-split models 23 and 24 are joined by applying a water repellent to the joint surfaces and applying dots of adhesive. By forming a layer of water repellent 14 on the surface and bonding adhesive 15 to the same bonding surface, the number of steps during bonding can be reduced.

From the above, even when the joint surfaces are vertical, the water repellent fills the gaps between the joint surfaces, allowing the divided models to be integrated without any gaps.

Even if there is a gap of approximately IIIm, the action of the water repellent can prevent the water-soluble coating agent from penetrating. Also,
The thickness of the water repellent agent may be less than 50 ml, so it does not provide resistance to thermal decomposition during leakage. Note that adhesive tape or the like may be used instead of adhesive.

(Effects of the Invention) Since the present invention is carried out according to the above-described method, no adhesive is required in the elution inflow passage, which improves leakage flow and improves the quality of PI products.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and is a side view of a disappearing model used in the method. FIG. 2 is a sectional view taken in the direction of arrow H in FIG. 1. FIG. 3 is a sectional view taken in the direction of the arrow ■ in FIG. 2. 4 and 5 are sectional views of main parts of other embodiments, Fig. 6 is a side view of main parts of another embodiment, and Fig. 7 is a cross-sectional view of the main parts of another embodiment, and Fig. 7 is a cross-sectional view of the main parts of another embodiment. Cross-sectional view FIG. 8 is another embodiment, and is a side cross-sectional view of the main part. FIG. 9 is a cross-sectional view taken along the joining surface in FIG. 8, taken along the arrow . 12.13...Divided model, 14...Water repellent 1
5...Adhesive S'S1 Figure 3r'4 is 2p+71'':=4
nth 5th [η 1st 6th m-ri ・;; s,'
yFigure 7 ゛19'-'

Claims (1)

[Claims] (1) Apply a water repellent to the opposing joint surfaces of the split model, bring the joint surfaces into close contact with each other, and apply or stick adhesive or adhesive tape along the boundary line of the joint surfaces in advance or after joining. A method of assembling a vanishing model for casting, characterized by assembling the divided models into one.