JPS61169133A - Mold for adhering investment casting pattern - Google Patents

Abstract

PURPOSE:To adhere surely divided patterns to each other and to mass-produce an investment casting pattern of complicated shape by positioning a pair of molds having cavities holes opened oppositely to the surface of cavity, and fixed to movable bases respectively mutually between them and with respect to an adhesives coating device. CONSTITUTION:A divided pattern 1a is automatically or manually set on a mold 2a, and is brought into tight contact with a cavity to correct its deformation when it is vacuum evacuated from a pipe 8 connected to a vacuum pump through an evacuating hole and a chamber part. In adhering both patterns 1a, 1b to each other, the pattern 1a is positioned with respect to a robot 11 by moving laterally a plate 3. Further, a mold 2b has the same evacuating mechanism as that of the mold 2a, and is fixed to a cylinder 15 through a plate 14 to move vertically. The mold 2a is moved to the position just below the mold 2b after coating an adhesives on the pattern 1a, to adhere the patterns 1a, 1b together by lowering the mold 2b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a synthetic resin foam mold used as a fugitive model for @-building, and particularly to a mold for adhering a segmented or segmented model.

[Prior art]

In the full mold method, foamed resin such as expanded polystyrene resin is used as the material for the fugitive model in the full mold method, and is formed into a predetermined shape by foaming in a mold, or by cutting from a foam block or cutting with a heating wire. It is customary to process the pieces into shapes, but in the case of complex-shaped souvenirs, it is difficult to foam-mold or machine-process them in one piece, so separate molded or machine-processed split models are glued together. The method of adhesion was to form a resin or wax film on the adhesion surface of the split model, and then apply the adhesive over the adhesive to prevent the adhesive from penetrating into the oval shape, thereby increasing the adhesion effect. A method has been proposed in which the adhesive tape is applied to the inner and outer surfaces of the joint after joining with an adhesive.

[Problem that the invention seeks to solve]

However, these methods are commonly used for bonding simple models, such as bonding the product part and the side part, or bonding of press molds, and do not allow for a very high degree of bonding, and all work is done manually. It was common for it to be made with ease, and it was not designed with mass production in mind. Moreover, in recent years, the range of parts that can be manufactured using the full mold method has expanded, and as more and more parts are required to have compact shapes and a high degree of contact with M, the following steps must be taken in order to achieve mass production using the conventional bonding method described in 1). There's a problem.

■ In order to automate the application process of the vanishing model, positioning between the coating equipment and the workpiece, that is, the divided model, is necessary. There is no known method or device for accurately positioning the plate mold.

■ Because the split model is deformed, dimensional accuracy of the cast product cannot be ensured because the deformation of the entire model is not corrected, or even if the gluing is suppressed, the deformation of the entire model is not corrected. .

The present invention is aimed at solving the above-mentioned problems, and attempts to provide a mold that can be used as a jig for automating the fabric making process of gluing h1) while correcting the deformation of the split plate mold. It is something to do.

[+ steps to help you figure out the problem]

The mold used for adhering the fugitive casting model of the present invention has a cavity that follows the regular external shape of the split model, and a vacuum suction hole that opens into the cavity mIi, and is fixed to a movable base. It consists of a pair of molds, and there is a gap between each mold and the adhesive applicator.
It is possible to perform positioning for gluing operations with ijl.
It is life.

[For production]

Split models, especially thin ones, are deformed, so it is necessary to correct the model to its regular shape in order to support the weight of a single piece of adhesive with a high degree of sheathing. KeM
Since the entire model cannot be corrected by simply providing the positioning standard of i, not only is the positioning between a certain mold and the equipment and between the oval molds not ensured, but also the tapping pressure during contact becomes uneven, resulting in poor adhesion. Therefore, when set in the mold of the present invention, the cavity that follows the regular external shape of the model provides a standard shape over a wide range and continuously, and furthermore, the vacuum suction mechanism forces the divided plate mold to close the cavity. It is layered and corrected to its regular shape.

Since the split model is made of a soft material such as expanded polystyrene, the degree of decompression only needs to be within a range that does not damage the model.
As a suction mechanism, for example, an intake hole that opens on the cavity surface can be set arbitrarily according to the shape of the model, or if the mold material is a porous material with open cells, the air permeability of the mold itself can be used. good. The above intake hole is 1lJlt,
Although it can also serve as an air inlet during molding, a separate air inlet may be provided.

Next, when gluing the model, if you do not create a step between the adhesive surface of the model and the flat part of the mold that should be contacted, it will be difficult to apply the adhesive, and the model itself will be uneven. Due to variations in the suction force, it becomes difficult to obtain a bonding effect that covers all parts of the bonding surface, so it is recommended that the depth of the cavity be made somewhat shallow so that the bonding surface protrudes from the mold by at least 0.2 m. Talented.

Further, in the present invention, the mold itself is fixed to a movable die base or the like, so that it can be positioned with respect to a moving coating device such as a robot, so that the adhesive can be applied accurately to a predetermined location.

〔Example〕

Hereinafter, examples of the present invention will be explained according to FIG.

Figure 1 shows a fugitive model 1 for casting an intake manifold, and in order to accommodate this, split plate molds 1a and 1b as shown in Figure 2 are molded or molded in consideration of the workability of the adhesive thread cloth. It is manufactured by machining, set in the mold of the present invention, and bonded.

Fig. 3 shows a plan view of the mold 2a constituting the present invention provided on a plate 3, 4 is a cavity modeled after the outer mold of the Pollution II Matamata mold 1a, and 5 is a positive side part other than the cavity 4. show. A large number of suction holes 6 are opened in the cavity 4 .

FIG. 4 shows a cross-sectional view taken along the line AA in FIG. 3, in which the split model 1a is set, and the mold 2a eye is fixed to the play 1-3 through the frame 7.

The divided model 1a is automatically or manually set in the mold 2a, but simply fitting it into the cavity 4 does not sufficiently correct the deformation of the mold, so suction is applied from a decompression pipe 8 connected to a vacuum pump (not shown). When vacuum suction is applied through the hole 6 and the chamber part 9, the split mold 1a is sufficiently densely layered in the cavity 4, and the deformation is corrected.

m]'A, the depth of the cavity 4 is set so that the split model 1a protrudes from the mold 2a, and H indicates the height of the step between the bonding direction 10 and the flat part 5.The split model 1a
Considering the variation in shape, the variation in suction force, and the adhesion of the adhesive to the mold 2a, the length is preferably 0.2 m or more.

Figure 4 shows molds 2a and 2 when gluing divided models 1a and 1b.
b), the plate 3 moves left and right on a rail (not shown), and the divided model 1 is moved relative to the robot 1).
a can be positioned. 12 (Mame @ coating machine,
13 indicates the 1) @ tube. The mold 2b has the same pressure reducing mechanism as the mold 2a, is fixed to the cylinder 15 via the plate 14, and can be moved up and down.

After applying adhesive to the divided mats 91a positioned in this way, the mold 2a is moved directly below the mold 2b, and the mold 2b is placed directly under the mold 2b.
is lowered to form a mutual adhesive surface 10. shown in FIG.
When 10 are put together, since the adhesive surfaces 10° 10 protrude from the molds 2a and 2b, the adhesive direction IT] is sufficiently compressed over all parts of 10, and the adhesive does not adhere to the molds 2a and 2b.

Next, after the bonding is completed J', the reduced pressure of the molds 2a and 2b is released and air is quickly introduced from the reduced pressure pipe 8. The fugitive model 1 is easily released from the mold, so the model 1 is taken out and the molds 2a and 2b are replaced. Return to position.

〔Effect of the invention〕

As described above, the present invention makes it possible to secure the positional relationship between the adhesion of the divided models and the automatic applicator, making it possible to easily and reliably adhere the divided models, making it possible to create evanescent models with complex shapes. I got to ask. In addition, the fugitive type 8 has no adhesive failure or adhesive extrusion, and cast products manufactured using it require almost no post-processing, which has the effect of improving productivity.

[Brief explanation of the drawing]

FIG. 1 shows a perspective view of the evanescent model, FIG. 2 shows a perspective view of the split model, FIG. 3 shows a plan view of the mold of the present invention, and FIG. FIG. 5 shows an explanatory view of the bonding operation, and FIG. 6 shows a cross-sectional view of the mold after bonding. In the figure,

Claims (2)

[Claims] (1) having a cavity that follows the regular external shape of the split model and a vacuum suction hole that opens into the cavity surface;
It consists of a pair of molds fixed to a movable base, and is characterized in that it can be positioned for a bonding operation between the pair of molds and between each mold and an adhesive applicator. A mold used for gluing fugitive casting models. (2) The mold according to claim 1, wherein a step difference of 0.2 mm or more is created between the flat part to be brought into contact when the divided model is set in the cavity and the adhesive surface of the divided model. .