JPH0479737B2 - - Google Patents

Abstract

PURPOSE:To make divided patterns adhere to each other without causing poor adhesion or a squeeze-out of adhesive and to mass-produce an investment casting pattern, by automatically coating an adhesive on the adhering surface of at least one side of divided patterns after setting the patterns on a pair of evacuat ing molds respectively, and sucking the patterns to bring them into tight contact with the molds, and moving the molds to the prescribed positions to join the patterns together. CONSTITUTION:An evacuating mold 4a, on which a divided pattern 1a coated with an adhesive is set is moved to the previously set position, and an evacuating mold 4b, on which a divided pattern 1b is set, is lowered by a cylinder 5, to make the adhering surfaces of patterns 1a, 1b coincide with each other, thereby finishing the adhering operation. Next, after releasing the evacuations of molds 4a, 4b, an investment casting pattern 1 is easily released by feeding air to chamber parts from pressurized air pipes.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a fugitive model for casting, and more specifically, a method for producing a fugitive model by gluing the divided pieces of a fugitive model that have been molded or processed into pieces. Relating to a method of manufacturing.

[Prior art]

For the fugitive model in the full mold method, the material used is foamed resin such as foamed polystyrene resin, and it is foam-molded in a mold, or cut from a foam block or cut with a heating wire. Usually, the product is manufactured by processing it into a predetermined shape, but in the case of complex-shaped castings, it is difficult to foam mold or machine the fugitive model in one piece. Parts of a fugitive model that have been molded or machined in parts are bonded together. The bonding method is to form a resin or wax coating on the adhesive surface of the split model and then apply the adhesive, thereby preventing the adhesive from penetrating into the mold and increasing the adhesive effect. A method has been proposed in which adhesive tape is attached to the inner and outer surfaces of the joint after joining.

[Problem that the invention seeks to solve]

However, these methods are only for pre-treatment or post-treatment of adhesion, and are only applicable to the joining of product parts and design parts, or the adhesion of simple models, such as the joining of press molds, and are not very useful. High precision was not required, and all work was normally done by hand, making it difficult to mass-produce. Moreover, in recent years, the range of parts covered by the full-mode method has expanded, and more and more parts have complex thin-walled shapes and require high adhesion accuracy.
There are the following problems in mass production using the conventional bonding method described above.

In order to automate the application of adhesive, it is necessary to determine the position between the application equipment and the workpiece.
The thinner the workpiece, that is, the segmented body of the evanescent model, the more difficult it is to position it as it deforms.

The joining of the divided bodies of the fugitive model after applying the adhesive requires precision to avoid any misalignment, but the divided bodies themselves are deformed.

The present invention is intended to solve the above-mentioned problems. After correcting the deformation of the divided parts of the evanescent model and accurately positioning them, adhesive is automatically applied, and the parts are glued together with high precision to make them disappear. The present invention aims to provide a method for manufacturing a sex model.

[Means for solving problems]

In the method for manufacturing a fugitive model for casting of the present invention, when the divided bodies of the fugitive model are joined and integrated, each divided body is formed with a cavity and a vacuum suction hole that follow the external shape of the fugitive model. The split body is placed in a pair of positioned suction molds and brought into close contact with the suction molds, and then on the adhesive surface of at least one of the divided bodies,
After the adhesive is automatically applied, each divided body is moved to a predetermined position and joined while being fixed in a suction type.

[Effect]

The number of divided parts of the fugitive model to be adhered is generally two, but it may be divided into three or more parts depending on the shape of the final product. The deformation of these divided bodies is corrected by suction within the suction mold, and they are accurately positioned within the suction mold.

Therefore, by fixing the suction mold itself with a die base, etc., the positional relationship with an automatic application device such as a robot is fixed, and the adhesive can be applied accurately to the predetermined area, so there is no adhesion failure or adhesive overflow. Goods can be obtained.

〔Example〕

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

In order to obtain the fugitive model 1 for casting the intake manifold shown in FIG. 1, considering the workability of adhesive application, the divided fugitive model parts 1a and 1b as shown in FIG.
manufactured by molding or machining.

The divided bodies 1a and 1b obtained by dividing molding or machining in this way have slight deformation,
Set it in the positioning mold 2 as shown in Fig. 3,
If an adhesive is applied to the adhesive surface 3 by a robot, teaching (memory) work will be required for each item, and even if the adhesive can be applied using the method described above, the divided models 1a and 1b will be deformed. Because of this, the adhesive surfaces 3 do not match, resulting in poor accuracy.

However, according to the present invention, when the divided model 1a is set in the suction mold 4a having a concave surface shape conforming to the regular shape shown in FIG. Corrected to normal shape. That is, the recess 5 of the suction type 4a is connected to a chamber part 7 via a communication pipe 6, and the chamber part 7 is connected to a reduced pressure surge tank or a vacuum pump (not shown) via a reduced pressure pipe 8, so that a vacuum pump can be used. By activating the split body 1a of the fugitive model automatically or manually set in the suction mold 4a,
It sticks to and adheres to. Note that the pressurizing pipe 9 is an air inlet for taking out the fugitive model 1 after integration. The diameter of the communication pipe 6 and the capacity of the vacuum pump may be such that the deformation can be corrected without damaging the segmented body 1a of the fugitive model.

FIG. 5 shows the arrangement of the suction molds 4a and 4b.The suction mold 4b is equipped with the same depressurizing and pressurizing mechanisms as the suction mold 4a, and the suction molds 4a and 4b are mounted on die bases 10 and 11 positioned in advance. The divided bodies 1a and 1b of the fugitive model are attached to the suction molds 4a and 4b by a pressure reducing mechanism (not shown). Therefore, the absolute position of the divided body 1a set in the suction mold 4a and the relative position with respect to the robot 12 are ensured, the coating work by the robot 12 is facilitated, and repeatability can be ensured. Note that 13 indicates a coating machine, and 14 indicates an adhesive supply pipe.

In this way, the suction mold 4a in which the divided body 1a of the fugitive model coated with adhesive is set is moved to a predetermined position (directly below the suction mold 4b), and the other divided body 1b is set in the suction mold 4a. type 4b
is lowered by the cylinder 15 and the bonding surfaces 3, 3 of the divided bodies 1a, 1b of the fugitive model are brought together, thereby completing the bonding work.

Next, after the adhesion is completed, the evacuation of the suction molds 4a and 4b is released and air is sent into the chamber parts 7 and 7 from the pressure pipes 9 and 9 (see Fig. 4), so that the fugitive model 1 can be easily released from the mold. Therefore, after removing the evanescent model 1, the suction molds 4a and 4b are returned to their original positions.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to ensure the positional relationship between the adhesive surface of the split model and the automatic applicator, making it possible to easily and reliably bond the split models, and to mass-produce fugitive models with complex shapes. It was summer. Furthermore, the above-mentioned fugitive model has no adhesion failure or adhesive extrusion, and cast products manufactured using the same require almost no post-processing, which has the effect of improving mass productivity.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a fugitive model, Fig. 2 is a perspective view of a divided body of the fugitive model, Fig. 3 is a sectional view of a conventional positioning die for applying adhesive, and Fig. 4 is a sectional view of a suction type. , FIG. 5 is an explanatory diagram of a bonding device according to the present invention. In the figure, 1...disappearing model, 1a, 1b...divided bodies of the dissipating model, 2...positioning mold, 3...adhesive surface, 4a, 4b...suction type, 5...concavity, 6...
Communication pipe, 7...Chamber part, 8...Decompression pipe, 9...Pressure pipe, 10, 11...Die base, 12...Robot, 13...Coating machine, 14...
...Adhesive supply pipe, 15... cylinder.

Claims (1)

[Claims] 1. When joining and integrating the divided bodies of the fugitive model, each divided body is set in a pair of positioned suction molds having a cavity and a vacuum suction hole that follow the external shape of the fugitive model. The two divided bodies are brought into close contact with the suction mold, and then an adhesive is automatically applied to the bonding surface of at least one of the divided bodies, and each divided body is moved to a predetermined position and joined while being fixed to the suction mold. A method for producing a fugitive model for casting, characterized by: