JPH03210937A - Adhesive transferring plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an adhesive transfer plate for transferring and applying an adhesive to a model piece forming a disappearing model used in disappearing model casting.

<Prior art> Compared to the sand mold #Ii construction method, it can be applied to objects with rough shapes, and the sand can be easily recovered and reused.
Well, a casting method called vanishing model casting is widely used.

Compared to the traditional sand casting method, the vanishing model casting method has the following advantages: ■ No core is required when manufacturing hollow parts, and ■ No binder is mixed into the sand, making it easy to recover and reuse the sand. This method has various advantages such as: (1) being applicable to complex-shaped objects; therefore, it is attracting attention as a casting method for, for example, engine intake manifolds.

This disappearing model casting method will be explained based on FIG. 3. Third
The figure shows a schematic structure inside a casting container when an intake manifold is cast by the lost model casting method.

Inside the casting volume Ml, there are extinguishable molds 2 and 3 made of expanded polystyrene having the same shape as the casting product (intake manifold) to be obtained.
is arranged, and the vanishing type 2.3 has an air passage 2a serving as an intake boat.

3a are formed respectively. A sprue 4 made of expanded polystyrene is attached to the fugitive mold 2.3, and the casting volume Nl is filled with casting sand 5.

In this state, molten metal 6 flows from the sprue 4 into the fugitive molds 2 and 3.
When injected, the sprue 4 and the dissipating molds 2 and 3 are sequentially thermally decomposed and replaced with molten metal, and two intake manifolds having the same shape as the dissipating molds 2 and 3 are obtained.

By the way, when forming the vanishing molds 2 and 3 of the intake manifold having a complicated shape by this vanishing model casting method, the vanishing molds 2 and 3 are divided into a plurality of models 7a, 7b, 8a, 8.
The models 7a, 7b and the models 8a, 8b are adhered to each other to form the required disappearing molds 2, 3.

When bonding the models 7a, 7b (8a, 8b), it is necessary to apply an adhesive to the bonding surface of the model 7a (or 7b). Since the adhesive surface of model 7a has a rough shape with curved surfaces, etc., adhesive is applied to the adhesive surface using an adhesive transfer plate (transfer plate) having a transfer surface of the same shape as the adhesive surface. is being carried out.

An adhesive application process using a transfer plate will be explained based on FIGS. 4 and 5. FIGS. 4 and 5 show an outline of the adhesive application process.

As shown in FIG. 4, when applying adhesive to the adhesive surface 11 of the model 7a, hot melt wax as an adhesive is applied to the transfer surface 12 of the transfer plate 13, which has a transfer surface 12 having the same shape as the adhesive surface 11. 14 and transfer plate 13
is pressed against the model 7a side to apply hot melt wax 14 to the adhesive surface 11.

Application of the hot melt wax 14 will be specifically explained based on FIG. A transfer jig 17 that is moved up and down by a transfer cylinder 16 is provided in a wax tank 15 filled with hot melt wax 14, and a transfer plate 13 is fixed on the upper surface of the transfer jig 17 with the transfer surface 12 facing upward. There is. A heater 18 is provided in the wax bath 15, and the wax bath is constantly maintained at 120±5°C. The model 7a is vacuum-adsorbed to the upper mold 19 with the adhesive surface 11 facing down, and is positioned at the upper part of the wax tank 15 together with the upper mold 19. The transfer plate 13 immersed in the hot melt bath is raised by driving the transfer cylinder 16, the hot melt wax 14 is held on the transfer surface 12, the transfer surface 12 is pressed against the adhesive surface 11, and the hot melt wax 14 is placed on the adhesive surface. Apply to 11.

As described above, by applying the hot melt wax 14 to the adhesive surface 11 of the model 7a using the transfer plate 13, the adhesive can be applied to the model 7a quickly and using a constant amount of adhesive. .

Next, the process of bonding the models 7a and 7b will be explained based on FIG. FIG. 6 shows an overview of the model bonding process.

The model 7b is vacuum-adsorbed to a lower mold 21 which moves up and down with a cylinder 20, and the model 7a coated with hot melt wax 14 is carried to the upper part of the lower mold 21 together with the upper mold 19 and positioned. The lower mold 21 is raised by driving the cylinder 20, the upper mold 19 and the lower mold 21 are pressed together, and the adhesive surface of the model 7b is adhered to the adhesive surface 11 of the model 1717m coated with the hot melt wax 14, and it disappears! S! ! form 2.

As described above, by applying adhesive using the transfer plate 13 and bonding the models 7a and 7b to form the evanescent mold 2, even a complex-shaped evanescent mold 2 can be easily formed. can.

<Problems to be Solved by the Invention> When applying the hot melt wax 14 using the transfer plate 13, if the transfer plate 13 and the model 7a come into contact during transfer, the hot melt wax 14 will escape from the adhesive surface. It is necessary that the transfer plate 13 and the model 7a do not come into contact with each other, and that they approach each other within the range of the thickness of the hot melt wax 14 held by the transfer plate 13. However, since the fugitive mold 2 for casting the intake manifold and the like has a slender shape, the models 7a and 7b cannot be divided between planes, resulting in a complicated shape of the adhesive surface, and the transfer surface 12 of the transfer plate 13 cannot be separated. It also has a curved surface or a vertical surface. For this reason, as shown in FIG. 7, when the transfer plate 13 is raised, the hot melt wax 14 flows on the curved surface part 22, and the thickness of the hot melt wax 14 transferred to the model 7a becomes smaller than that of the flat part 23. The thickness t of the curved surface portion 22 becomes thinner than the thickness T. Therefore, model 7
When bonding m and 7b, there was a risk that the adhesion at the curved surface portion 22 would be insufficient or the hot melt wax 14 would protrude from the flat surface portion 23, making it impossible to form the fugitive mold 2 with high accuracy.

The present invention was made in view of the above situation, and an object of the present invention is to provide an adhesive transfer plate that can uniformly hold adhesive even if the transfer surface has a complicated shape.

<Means for solving tam> The configuration of the present invention for achieving the above object is to apply an adhesive to the bonding surface of a disappearing model for disappearing model casting, which is formed by bonding a plurality of model pieces. The adhesive transfer plate for transfer-coating is characterized in that a cavity is formed in the transfer surface where the adhesive is held and which is pressed against the adhesive surface side of the model piece.

Function: Adhesive is retained on the transfer surface and in the cavity, and even on a complex-shaped transfer surface that is not horizontal, the adhesive seeps out of the cavity and maintains the thickness, ensuring that the adhesive remains on the transfer surface. Be held.

Embodiment FIGS. 1 and 2 show a state in which an adhesive is applied using an adhesive transfer plate (transfer plate) according to an embodiment of the present invention. Note that the members other than the transfer plate are the same as those described in the related art, so the same reference numerals are given and redundant explanation will be omitted.

A transfer surface 32 having the same shape as the adhesive surface 11 of the model 7a as a model piece is formed on the transfer plate 31, and the transfer surface 3
2 holds hot melt wax 14 as an adhesive, presses the transfer plate 31 toward the model 7a, and applies hot melt wax 14 to the adhesive surface 11 (see Figure 5).
.

A plurality of cavities 34 are formed in the curved surface portion 33 of the transfer surface 32 of the transfer plate 31, and the opening side of the cavities 34 is inclined downward at an angle θ. The inclination angle θ is such that the hot melt wax 14 is always held uniformly on the transfer surface 32 due to the shape of the curved surface portion 33.

When hot melt wax 14 is applied while fixing transfer plate 31 to transfer jig 17 (see FIG. 5), hot melt wax 14 is held within transfer surface 32 and cavity 34 .

When the transfer plate 31 is raised, a part of the hot melt wax 14 on the curved surface part 33 flows, but the hot melt wax 14 in the cavity 34 seeps out into the curved part 33, and the transfer surface 32 becomes the adhesive surface of the model 7a. 11, hot melt wax 14 is applied to the adhesive surface 11 as shown in FIG.
be applied evenly.

Since the transfer plate 31 described above has a plurality of cavities 34 formed in the curved surface portion 33, it is possible to secure the thickness and hold the hot melt wax 14 even in the curved surface portion 33.
This can be done by uniformly applying hot melt wax 14 to the adhesive surface 11 of the model 7a.

<Effects of the Invention> Since the adhesive transfer plate of the present invention has a cavity formed on the transfer surface, the adhesive seeps out from the cavity even on a WM-shaped transfer surface that is not in a horizontal state, ensuring a sufficient thickness for adhesion. can hold the agent. Therefore, even if the adhesive surface of the model piece is complicated, the adhesive can be applied uniformly, and the disappearing model can be formed with high precision.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a state in which adhesive is applied using an adhesive transfer plate according to an embodiment of the present invention, and FIG.
The figure is a side view, and Figure 3 is a schematic structural diagram of the inside of the casting bud when an intake manifold is cast by the disappearing model casting method.
Fig. 4 is an explanatory diagram of the adhesive application process using a conventional adhesive transfer plate, Fig. 5 is a sectional view of the device, Fig. 6 is a sectional view showing the model bonding process, and Fig. 7 is an explanatory diagram of the adhesive application process using a conventional adhesive transfer plate. FIG. 3 is a cross-sectional view showing the application status of In the drawing, 7a is a model, 11 is an adhesive surface, 14 is hot melt wax, 31 is a transfer plate, 32 is a transfer surface, 33 is a curved surface portion, and 34 is a cavity. Figure 1 Figure 2 0 4 1 Figure 3 Figure 4 Figure 0 Figure 5 Figure 6

Claims (1)

[Claims] In an adhesive transfer plate that transfers and applies an adhesive to the adhesive surface of a disappearing model for vanishing model casting, which is formed by bonding a plurality of model pieces, the adhesive is retained and the adhesive of the model pieces is bonded. An adhesive transfer plate characterized by having a cavity formed in the transfer surface that is pressed against the surface side.