JPH064178B2 - Mold used for bonding disappearing model for casting - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a synthetic resin foam model used as an extinguishing film mold for casting, and more particularly to a mold for bonding a split-molded or split-processed model.

[Prior art]

Foaming resin such as foamed polystyrene resin is used as the material of the fugitive model in the full-molding method, and the foamed resin is foamed in a molding die or cut from a foam block or cut with a heating wire. Usually, it is processed into a shape, but in the case of a cast product with a complicated shape, it is difficult to foam-form or machine it integrally, so we decided to bond the split model that has been split-molded or split-machined. , As a method of bonding, a method of forming a resin or wax film on the bonding surface of the divided model and then applying a one-sided adhesive to prevent the adhesive from penetrating into the model and enhance the bonding effect ( JP-A-51-
87121), or after joining with an adhesive,
A method of attaching an adhesive tape to the inner and outer surfaces of the joint portion (Japanese Patent Laid-Open No. Sho 5
3-16318) is proposed.

[Problems to be solved by the invention]

However, these methods are applied to the joining of the product part and the plan part, or the simple model adhesion as represented by press-type joining, which does not require very high accuracy, and all the work is done manually. It is usually done, and it was not considered in terms of mass production. Moreover, in recent years, when the target parts of the full molding method have spread and many of them have complicated thin shapes and are required to have high bonding accuracy, there are the following problems in mass production by the conventional bonding method described above.

In order to automate the adhesive coating work for mass production of fusible models, positioning between the coating equipment and the work, that is, the split model was necessary. There is no known method or device that can be positioned at.

Since the split model is deformed, a gusset (displacement) occurs when the bonding surfaces are matched, or even if the gusset is suppressed, the deformation of the entire model is not corrected, so that the dimensional accuracy of the cast product cannot be secured.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a mold used as a jig for automating the adhesive application operation while correcting the deformation of the split model.

[Means for solving problems]

The mold used for adhering the disappearing model for casting of the present invention has a cavity having a regular outer shape of a split model and a vacuum suction hole opening on the cavity surface, and between the pair of molds. Further, it is characterized by comprising a pair of molds fixed to a movable base so that positioning can be performed for a bonding operation between at least one of the molds and the adhesive applying device.

[Work]

The split model, especially the thin model, is deformed, so it is necessary to correct the model to a regular shape in order to obtain a highly accurate bonded integrated product. Since the entire model is not corrected simply by applying, the positioning between the model and the equipment and between the models is not secured, and the surface pressure at the time of bonding becomes non-uniform, resulting in poor bonding. Therefore, if the mold of the present invention is set, the standard shape of the model is calibrated to give a standard of a regular shape in a wide range and continuously. It is brought into close contact and is corrected to a regular shape.

Since the split model is made of a soft material such as polystyrene foam, the degree of decompression should be within the range where the model is not damaged,
As the suction mechanism, for example, an air intake hole opened on the cavity surface may be arbitrarily measured according to the model shape, or if the mold material is a porous material having open cells, the air permeability of the mold material itself may be used. The air intake port can also serve as an air inlet when releasing the mold, but an air inlet may be provided separately.

When bonding the model next time, if there is no step between the bonding surface of the model and the flat part that the mold should touch, it will be difficult to apply the adhesive, and there will be variations and suction of the model itself. Since it is difficult to obtain the adhesive effect over the entire area of the adhesive surface due to the variation in force, it is desirable to make the depth of the cavity somewhat shallow so that the adhesive surface protrudes from the mold by at least 0.2 mm.

Further, in the present invention, since the mold itself is fixed to a movable die base or the like and positioning is possible with respect to an automatic coating device such as a robot, the adhesive can be accurately applied to a predetermined portion.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a disappearing film mold 1 for intake manifold casting. To obtain this, in consideration of workability of adhesive application, split models 1a and 1b as shown in FIG. 2 are molded or machined. It is manufactured by processing, set in the mold of the present invention and bonded.

FIG. 3 is a plan view of the mold 2a constituting the present invention provided on the plate 3. Reference numeral 4 denotes a cavity which follows the outer mold of the split model 1a, and 5 denotes a plane portion other than the cavity 4. A large number of suction holes 6 are opened in the cavity 4.

FIG. 4 is a sectional view taken along the line AA in FIG. 3, in which the split model 1a is set, and the mold 2a itself is fixed to the plate 3 via the frame 7.

The split model 1a is automatically or manually set in the mold 2a, but the deformation of the model is not sufficiently corrected by simply fitting it into the cavity 4, so that the decompression pipe 8 connected to a vacuum pump (not shown) is used to draw a suction hole. When the vacuum suction is performed via 6 and the chamber section 9, the split model 1a is sufficiently brought into close contact with the cavity 4 and the deformation is corrected.

As described above, the depth of the cavity 4 is designed so that the split model 1a projects from the mold 2a, and H is the adhesive surface 10
The height of the step between the flat portion 5 and 0.2 mm or more is preferable in consideration of variations in the shape of the divided model 1a or variations in the suction force, and further, the adhesion of the adhesive to the mold 2a.

FIG. 5 shows the molds 2a, 2 for bonding the split models 1a, 1b.
The arrangement state of b is shown, the plate 3 moves left and right on a rail (not shown), and the divided model 1 with respect to the robot 11 is shown.
It is possible to position a. 12 is an automatic coating machine,
Reference numeral 13 represents an adhesive supply pipe. The mold 2b has a pressure reducing mechanism similar to that of the mold 2a, is fixed to the cylinder 15 via the plate 14, and can move up and down.

After the adhesive is applied to the divided model 1a thus positioned, the mold 2a is moved directly below the mold 2b, and the mold 2b is lowered to bring the mutual adhesive surfaces 10, 10 into alignment with each other as shown in FIG. Then, since the adhesive surfaces 10 and 10 project from the molds 2a and 2b, the adhesive surfaces 10 and 10 are sufficiently compressed over the entire area, and the adhesive does not adhere to the molds 2a and 2b.

Next, after the bonding is completed, the decompression of the molds 2a and 2b is released, and when the air is sent from the decompression pipe 8, the disappearing model 1 is easily released. Therefore, the model 1 is taken out and the molds 2a and 2b are returned to their original positions. return.

〔The invention's effect〕

As described above, according to the present invention, the positional relationship between the adhesive surface of the split model and the automatic coating device can be secured, and the split model can be easily and surely bonded, and the fusible model having a complicated shape can be mass-produced. That's it. In addition, the disappearing film type does not have poor adhesion or the adhesive does not squeeze out, and a cast product manufactured using this does not require any post-processing, and therefore has the effect of improving productivity.

[Brief description of drawings]

 1 shows a perspective view of a vanishing model, FIG. 2 shows a perspective view of a split model, FIG. 3 shows a plan view of a mold of the present invention, and FIG. 4 shows A- in FIG. FIG. 5 shows a sectional view in the A direction, FIG. 5 shows an explanatory view of the bonding operation, and FIG. 6 shows a sectional view of the mold in the state where the bonding is completed. In the figure, 1 ... Disappearance model 1a, 1b ... Division model 2a, 2b ... Mold 3 ... Plate 4 ... Cavity 5 ... Plane part 6 ... Suction hole 7 ... Frame 8 ... Decompression pipe 9 ... Chamber part 10 ... Adhesive surface 11 ... Robot 12… Automatic coating machine 13… Adhesive supply pipe 14… Plate 15… Cylinder

Claims (1)

[Claims] 1. A split model having a cavity having a regular outer surface shape, and a vacuum suction hole opening on the cavity surface, and between at least one pair of the molds, and at least one mold and an adhesive coating. A mold used for bonding a disappearing model for casting, which comprises a pair of molds fixed to a base that can be moved to and from a device so that it can be positioned for a bonding operation.