JPH02307647A - Manufacture of dissipation pattern - Google Patents

Abstract

PURPOSE:To eliminate the ruggedness in a cast product and to improve the quality by forming semi-solid paste filled up in space part into shape so as to just embed the gap between a pattern for upper mold and a pattern for lower mold at the time of joining both patterns. CONSTITUTION:A jig 1 for upper mold and a jig 2 for lower mold are joined to form the shape part 9 having the prescribed shape between both jigs. Succes sively, the semi-solid paste 13 is filled up into the spade part 9 with an injection device 11. Further, by taking off the jig 1 for upper mold, the semi-solid paste 13 filled up in the space part 9 is taken out with a transferred jig 15 and trans ferred into a joining face in the pattern 7 for lower mold. Successively, the pattern 5 for upper mold is joined to the pattern 7 for lower mold to manufac ture a dissipation pattern. On joining face of the dissipation pattern, the semi- solid paste 13 just embeds the gap between the pattern 5 for upper mold and the pattern 7 for lower mold, and by this method, the dissipation pattern without any ruggedness on the joining face is obtd. By this dissipation pattern, the ruggedness in the cast product is eliminated and the quality can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a vanishing model, and particularly to a method for manufacturing a vanishing model that allows casting of products without uneven parts. Ru.

(Problem to be solved by the prior art and the invention) A vanishing model is manufactured by suitably combining blocks made of vanishing material (for example, expanded polystyrene), and is made to match the shape of the product to be cast. I am creating a model.

When using the above-mentioned vanishing material, the styrene foam material is a bead (sphere), and when foam molding is performed, the spherical shape will remain at the corner of the block, so the corner of the block will not be rounded. It becomes a state of being tinged.

By the way, there are two methods for joining blocks: one using glue and the other using double-sided tape. The explanations will be given below.

First, there is a method using glue, which is called a hot melt adhesive transfer method. That is,
As shown in FIG. 3(a), a hot nord adhesive 103 is contained in the hot melt bath 101. As shown in FIG. ”
Transfer plate 1-10 in the second Bot melt agent 103
The tip of the transfer plate 105 is immersed in the direction indicated by the arrow a in the figure.
- The adhesive 103 is attached.

Next, the transfer plate 105 is moved to a position above the lower model 107 as shown by the arrow frame in the figure, and moved in the direction of the lower model 107 as shown by the arrow C in the figure. True melt adhesive 10 on the joint surface of 107
Transfer 3. This is the state shown in FIG. 3(b).

Next, as shown in FIG. 3(c), the upper model 109 is joined to the lower model 107 to produce a disappearing model having a desired shape.

However, in the case of this hot melt transfer method,
There were the following problems.

That is, as shown in FIG. 4, when the upper model 109 and the lower model 107 are joined, the hot melt adhesive 1
03 protrudes from between the two. As shown in FIG. 4, a coating agent 113 is applied to the surfaces of the upper model 109 and the lower model 107.

In this way, if a part of the adhesive 103 protrudes, it will affect the product, and as shown in FIG.
15 (indicated by reference numeral 116 in the figure). In this case, it becomes necessary to perform operations such as scraping off the protruding portions after casting.

Alternatively, there is a method of arranging the jig 111 on the outer circumferential side, but this takes time and effort, and depending on the shape of the disappearing model, it may be impossible to arrange the jig 111.

Furthermore, in the case of hot melt adhesive 103, it is difficult to uniformly arrange adhesive 103 on the bonding surface. For example, if there are irregularities on the joint surface, the adhesive 103 will flow to a lower level due to its own weight, and as a result, the thickness of the adhesive 103 will become uneven. As a result, even when the upper model 109 and the lower model 107 are joined together, a gap may occur, resulting in a decrease in the quality of the product 115.

Next, a method of using double-sided tape will be explained.

First, as shown in FIG. 6(a), the tape cutter 121
The double-sided tape 123 is cut into a predetermined shape. As a result, the cut double-sided tape 123 is adhered to the tip end surface of the tape cutter 121.

Next, as shown by arrows d and e in the figure, the cut double-sided tape 123 is adhered to the joint surface of the lower model 107.

Next, as shown in FIG. 6(b), the upper model 109 is joined to the lower model 107. A vanishing model is now manufactured.

However, the bonding method using double-sided tape 123 has the following problems.

That is, in the case of a block made of vanishing material, the corners thereof will have a rounded shape, as described above. As a result, as shown in FIG.
As a result, unevenness is formed at the joint, which directly affects the product, resulting in the formation of a notch 117 in the product 115, as shown in FIG.

When the notch 117 is formed in this way, its shape cannot be restored by a simple method such as scraping it off. Further, even when the product 115 is used, there is a problem in that stress is concentrated in the notch 117, making it easy to break.

The present invention has been made based on these points, and its purpose is to provide a method for manufacturing a vanishing model that can eliminate unevenness in a cast product.

(Means for Solving the Problems) In order to achieve the above object, the vanishing model casting method according to the present invention provides a method for joining one model and another of the vanishing models formed by combining a plurality of arbitrarily shaped models. a step of joining a jig having a joint surface of the same shape as the surface and another jig to form a space shaped along the joint surface at the joint portion;
a step of filling the space with semi-solid glue; a step of transferring the semi-solid glue filled in the space onto a joint surface of one model or another model of the disappearing model; This method is characterized by comprising a step of joining one model to another model.

(Function) First, among the vanishing models made by combining multiple models of arbitrary shapes, 10 jigs and other jigs having joint surfaces of the same shape as the joint surfaces of one model and the other models. By joining, a space having a shape along the joint surface is formed in the joint portion.

In addition, the jig and other jigs that have a joint surface of the same shape as the joint surfaces of one model and another model can be of various types, such as up and down, left and right, depending on the direction of joining, but below: For convenience, an example will be described in which an upper mold jig and a lower mold jig are used to join an upper mold model and a lower mold model.

As a means for forming the above-mentioned space, for example, a recess of a predetermined depth is formed on the joint surface side of the upper mold jig or the lower mold jig, or a recess of a predetermined depth is formed on the joint surface of both. It can be easily formed by leaving it in place.

Next, the space is filled with semi-solid glue.

Next, the semi-solid glue filled in the space is transferred to the joint surface of the upper or lower model of the vanishing model. As for the transfer method, you can use one side of the jig as it is as a transfer jig, or you can use a separately prepared jig, transfer the glue to this jig, and then transfer it to the upper template. Alternatively, it may be transferred to a lower model.

Also, when transferring, it is possible to use a method of peeling off the glue using pressurized air, or by changing the material of each jig or model, the adhesive force to the glue can be made stronger or weaker. , peeling, transfer, or other methods may be used.

Next, the disappearing model is manufactured by joining the upper model and the lower model of the disappearing model.

According to the present invention, the semi-solid glue filled in the space is formed in a shape that exactly fills the gap formed between the upper model and the lower model when they are joined. Therefore, when the upper model and lower model are joined through this, no protrusions or notches are formed as in the conventional method, and unevenness occurs in the cast product. It is possible to improve its quality and maintain its soundness.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. First, as shown in FIG. 1(a), an upper die jig 1 and a lower die jig 3 are assembled. Join. The upper die jig 1 and the lower die jig 3 are formed with bonding surfaces having the same shape as the bonding surfaces of the upper die model 5 and the lower die model 7 (shown in FIGS. 1(b) and (C)). There is.

Moreover, the joint surface of the upper mold jig 1 is a recess with a predetermined depth, so when the upper mold jig 1 and the lower mold jig 3 are joined, a space 9 of a predetermined shape is formed between them. is formed. Here, the predetermined shape refers to a shape that exactly fills the gap that would be formed on the image plane when the upper model 5 and the lower model 7 are to be joined.

Next, the space 9 is filled with semi-solid glue 13 using the injection device 11 .

Next, the upper die jig 1 is removed and the semi-solid glue 13 filled in the space 9 is collected using the transfer jig 15. and,
As shown in FIG. 1(b), this is transferred to the joint surface of the lower model 7.

Next, as shown in FIG. 1(c), the upper model 5 is joined to the lower model 7 to produce a disappearing model.

As shown in FIG. 2(a), the bonding surface of the disappearing model is such that the semi-solid glue 13 exactly fills the gap between the upper model 5 and the lower model 7, so that the bonding surface is a disappearing model with no unevenness. is formed.

Further, when joining the two, as shown in FIG. 2(b), the upper model 5 and the lower model 7 may be appropriately pressed with an appropriate force. As a result, the uneven portions 17 formed on the joint surfaces of both horizontal molds 5.7 are also filled with the semi-solid glue 13, thereby improving the quality of the product.

Furthermore, as shown in FIG. 2(b), a portion of the semi-solid glue 13 may protrude by a small amount, thereby forming a protrusion on the cast product, but this portion must be scraped off. can be easily repaired.

Furthermore, for peeling off and transferring the semi-solid glue 13 filled in the space 9, there is a method using pressurized air. That is,
By supplying pressurized air, it is peeled off from one side and adhered to the other.

In addition, by changing the material of each jig and model, the strength of adhesion to the glue 13 can be set, for example, the lower mold model 7, the transfer jig 15, the lower mold jig 3, and the upper mold jig 1 in this order. , the adhesive strength is gradually weakened.

As a result, the glue 13 is adhered to a member with a stronger adhesive force, thereby facilitating peeling and transfer, and finally adhering to the bonding surface of the lower model 7.

As described above, the following effects can be achieved by this embodiment.

First, the quality of the cast product can be improved by eliminating unevenness. That is, by filling the space 9 formed by the upper die jig 1 and the lower die jig 3 with the semi-solid glue 13, when the upper die model 5 and the lower die model 7 are joined, there is no space between them. This is because it is possible to obtain a shape that just encloses the gap formed, and this shape is directly transferred to the joining surface of the lower model 7, and the upper model 5 is joined.

Further, by appropriately setting the depth of the space 9, a desired thickness can be obtained. In particular, since the glue 13 is semi-solid, it does not run after being transferred and a uniform thickness is maintained, thereby eliminating problems caused by uneven thickness. .

Further, by appropriately changing the shapes of the joint surfaces of the upper die jig 1 and the lower die jig 3, it is possible to easily accommodate vanishing models of all shapes.

Furthermore, the glue 13 is also effective without being wasted.

It should be noted that the present invention is not limited to the above embodiment,
The glue may be a powder that becomes semi-solid when heated.

Further, in the above embodiment, the glue is transferred to the bonding surface of the lower model, but the glue is not limited thereto, and may be transferred to the upper model 5.

Further, when filling the glue, it may be press-fitted by an injection method, a cylinder method, or the like.

(Effects of the Invention) As detailed above, according to the vanishing model casting method of the present invention, it is possible to easily obtain a vanishing model that can eliminate irregularities in a cast product and improve its quality.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are diagrams showing one embodiment of the present invention.
Figures (a) to C) are diagrams showing the manufacturing method in the order of steps, Figures 2 (a) and (b) are diagrams explaining the operation, Figures 3 to 8 are diagrams showing conventional examples, and Figures 3 to 8 are diagrams showing the conventional example. The figure shows the process order of the manufacturing method using the hot melt adhesive method, Figure 4 shows the phenomenon of hot melt adhesive extrusion, Figure 5 shows the unevenness of the product, and Figure 6 shows both sides of the product. FIG. 7 is a diagram showing the production method using tape in order of steps, FIG. 7 is a diagram showing the occurrence of unevenness, and FIG. 8 is a diagram showing the occurrence of notches in the product. , 1・
...Upper mold jig, 3...Lower mold jig, 5...Upper model,
7... Lower model, 9... Space, 11... Injection device, 13... Semi-solid glue.

Claims (1)

[Claims] Among the vanishing models formed by combining a plurality of models having arbitrary shapes, one jig and another jig having a joint surface of the same shape as the joint surfaces of one model and the other models are joined together. a step of forming a space in a shape along the bonding surface in the part; a step of filling the space with semi-solid glue; 1. A method for manufacturing a disappearing model, comprising the steps of transferring the model to a joining surface of another model, and joining one model of the above-mentioned disappearing model to another model.