JPH0366443A - Method for joining lost foam pattern composed of split mold - Google Patents

Abstract

PURPOSE:To reduce the development of defective by fitting a stick-like elastic body to a part corresponding to cylindrical inner part in one side of split mold, applying adhesive on joining face, sticking the other side of split mold and taking out the elastic body before hardening of the adhesive. CONSTITUTION:Lost foam patterns composed of the bent cylindrical parting molds 1, 4 are stuck. To the part corresponding to the cylindrical inner part in the one side of split mold 1, the stick-like elasic body 2, which is closely brought into contact with the cylindrical inner circumferential face and inserted, is fitted. After that, the adhesive is applied on the joining face 3 and the other side of spliting mold 4 is stuck. Before hardening of the adhesive, the elasic body 2 is pulled out from the one end of cylindrical shape and taken out. By this method, the adhesive bulged out from the cylindrical inner circumferential face is thinly and widely spread and the inner circumferential face of cylindrical lost foam pattern can be flattened.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is a method for bonding a fugitive model having a curved cylindrical shape and consisting of a split mold, in which the adhesive protruding into the cylindrical interior of the joint surface is removed. The purpose is to provide a method that can reliably eliminate them.

[Conventional technology] Depending on the product to be cast, the fugitive model may be an upper mold,
It is manufactured into a lower mold or a left and right split mold, and is used by bonding both parts with adhesive.

Generally, when a fugitive model is glued and the model is cylindrical, the adhesive may protrude onto the inner peripheral surface of the model, resulting in defective products, so it is necessary to remove the protruding portion of the adhesive.

However, if the model is large, it is inconvenient to handle, and if the model is cylindrical and difficult to fit your fingers into, it is difficult to remove the protruding parts. In particular, when the cylindrical fugitive model is bent, it is extremely difficult to remove the adhesive that has protruded onto the cylindrical inner peripheral surface.

On the other hand, if the amount of adhesive is reduced, not only will the adhesion not be sufficient, but there will be areas without adhesive, which may lead to the production of defective products, so a large amount of adhesive is used.

[Problems to be solved by the present invention] Conventionally, it has been extremely difficult to remove adhesive protruding from the inner peripheral surface of a curved cylindrical fugitive model.
The split-type vanishing model is in an unusable state.

The present invention can be applied to a curved cylindrical evanescent model,
To provide a method for forming a split mold and easily removing adhesive protruding from the inner circumferential surface of a cylindrical shape.

[Means for Solving the Problems] In the present invention, when adhering fugitive models that are curved and cylindrical and split into molds, a portion corresponding to the cylindrical interior of one of the split molds is bonded to the cylindrical inner periphery. After attaching a stick-shaped elastic body that fits and tightly adheres to the surface, apply adhesive to the joint surface and adhere the other split mold, and before the adhesive hardens, attach the elastic body to one end of the cylindrical shape. It consists of a structure that can be pulled out and taken out.

The company said that the horizontal split mold of the fugitive type can be split on the left and right sides of the upper and lower molds, and that the fugitive model can be made using conventional glue. can be used.

Further, the stick-shaped elastic body used in the present invention is made of rubber or various plastics, and must have elasticity and flexibility at the same time. Furthermore, it is sufficient to prepare several types of elastic bodies with different diameters, and the shape of the bend does not matter. It is necessary to be able to press the surrounding surface strongly.

[Function] A stick-shaped elastic body is fitted into one of the split molds of the bent fugitive model. Next, an adhesive is applied to the joining surface of the split mold of the fugitive model, and the other split mold is adhered thereto. In this case, the stick-like elastic body serves as a guide for positioning during bonding, allowing for proper bonding.

Next, before the adhesive hardens, the stick-shaped elastic body is pulled out from one end of the cylindrical fugitive model adhered as described above, since the stick-shaped elastic body has elasticity and flexibility. , it can be easily pulled out from one end of the bent cylindrical fugitive model.

In addition, in the above-mentioned bonding, since a stick-like elastic body is fitted on the inner peripheral surface of the cylindrical fugitive model,
The portion that protrudes from the inner peripheral surface is relatively small, and even if it does protrude, it is suppressed by the stick-shaped elastic body fitted inside, or by pulling out the stick-shaped elastic body.
The adhesive that is protruding is thin on the inner circumferential surface of the cylindrical fugitive model.
And it is spread wide and formed into a flat surface.

If there is a possibility that the adhesive may adhere to the stick-like elastic body, a known release agent may be appropriately applied to the surfaces of the two stick-like elastic bodies to prevent the adhesive from adhering.

[Effects of the Invention] As described above, the present invention involves bonding bent, cylindrical, and split split fugitive models by fitting a stick-shaped elastic body into one of the split molds and bonding. By pulling out the stick-like elastic body, the adhesive protruding from the inner peripheral surface of the cylindrical shape can be spread thinly and widely, and the inner peripheral surface of the cylindrical fugitive model can be flattened, thus preventing the adhesive from overflowing. The occurrence of defective products due to parts can be significantly reduced. still.

When adhering, the stick-like elastic body serves as a guide during adhesion, allowing for proper adhesion.

[Example of Implementation] FIGS. 1 and 2 show an example of the present invention. Next, the present invention will be specifically explained with reference to these drawings. A stick-shaped elastic body 2 is fitted into the corresponding internal portion of one of the split molds L. In this case, one end of the stick-shaped elastic body 2 is made to protrude from the end T of the split mold 1 as shown in FIG. It is desirable to make it easy to pull out.

Next, an adhesive is applied to the joining surface 3 of the split mold 1, and the other split mold 4 is adhered thereto. In this case, the adhesive may be applied to the joining surface 3 of the split mold 4.

After gluing the split molds 1 and 4 as described above, while the adhesive is in a flowing state, the stick-shaped elastic body 2 installed inside the fugitive model is attached to the fugitive model as shown by the arrow in FIG. It should be noted that a holder may be attached to the outside of the two glued split molds 1 and 4 to prevent them from shifting when the stick-like elastic body 2 is pulled out from one terminal.

That is, in the present invention, when bonding a bent cylindrical split mold, the adhesive protruding onto the inner peripheral surface of the cylindrical fugitive model is removed by the stick-like elastic body 3 fitted therein. It is possible to prevent the adhesive from protruding to the inner circumferential surface, and even if it does protrude, the protruding adhesive is spread thinly and widely on the inner circumferential surface by being suppressed by the stick-shaped elastic body 3 or by pulling out the stick-shaped elastic body 3. It can be rolled and flattened.

FIG. 3 shows another embodiment of the present invention,
When a part of the evanescent model 5 has a slightly enlarged diameter part 6, a part of the stick-like elastic body 7 has an enlarged diameter part corresponding to the enlarged diameter part 6, and inside thereof, Cavity part 8
If you use something with this, you can easily process it in the same way as above.

[Brief explanation of drawings]

Figure 's1 is an explanatory diagram of the state before adhesion of one embodiment of the present invention, and Figure 's2 is '! FIG. 3 is an explanatory view of the state in which the stick-like elastic body is pulled out after adhesion in FIG. J1, and FIG. 3 is a sectional view of another embodiment of the present invention. 1.4 = Split mold, 2.7: Stick-like elastic body, 3: Joint surface, 5: Disappearance model, 6: Expanded diameter portion, 8: Cavity portion. Figure 1

Claims (1)

[Claims] When adhering the fugitive model, which has a curved cylindrical shape and is divided into molds, a stick-shaped elastic body that closely contacts and fits into the cylindrical inner peripheral surface of one of the split molds is used. After attaching the split mold, an adhesive is applied to the joining surface to adhere the other split mold, and the elastic body is pulled out from one end of the cylindrical shape before the adhesive hardens. How to attach fugitive models.