JPH02280941A - Adhesive method for lost foam pattern for casting - Google Patents

Abstract

PURPOSE:To execute adhesion of lost foam pattern for casting without entirely developing defect of adhesion and adhesive burr by joining divided patterns after uniformly applying the adhesive on the joining faces of the patterns through joining face of a coating instrument having the same shape. CONSTITUTION:After fitting the lost foam divided patterns 4a, 4b to a base 1 and a supporting member 5, the adhesive is applied to the coating instrument 6 heated at the prescribed temp., and this adhesive is held to fluid condition. Successively, the coating instrument 6 is advanced to lower part of the pattern 4b, and also by descending the member 5, the pattern joining face 4c of the pattern 4b is brought into contact with the joining face 6a of the coating instrument 6 and the adhesive is uniformly applied to the joining face 4c. After that, the member 5 is ascended and also the coating instrument 6 is retreated, and again the member 5 is descended to join the patterns 4a, 4b. In this result, the lost foam pattern, the joining faces 4c, 4d of which is uniformly coated with the adhesive with the right amount, is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a method for bonding fugitive casting models.

(Prior art) Conventionally, fugitive casting models with complex shapes are molded in parts, and after applying hot melt adhesive to the joint surfaces, they are joined (
For example, Japanese Patent Application Laid-Open No. 61-169134).

(Problems to be Solved by the Invention) In the conventional bonding method, when the fugitive segmented model has a complicated shape, if it takes time to apply the adhesive, the adhesive solidifies and cannot be bonded. Also, if there is too much adhesive, the adhesive will ooze out, resulting in a molded product having holes when casting is performed. On the other hand, if there is not enough adhesive, gaps will be created between the fugitive split models, and molding sand will enter the gaps during molding, and when further casting is carried out, hot water will not enter those areas and cracks will form, resulting in poor health. This causes problems such as not being able to obtain a suitable casting. Therefore, the present invention has been made to solve these problems, and is capable of adhering fugitive split models quickly and without causing excess or deficiency of adhesive on the model joint surfaces. The present invention provides a method.

(Means for Solving the Problems) The present invention applies a fluid adhesive to an applicator having an engaging surface having the same shape as the model joining surface, and then connects the engaging surface and the model joining surface. This is a method of bonding fugitive models for casting, in which adhesive is uniformly applied to the joining surfaces of the models in surface contact, and then the divided models are joined.

(Function) Since the adhesive applied to the engagement surface of the applicator is uniformly applied to the model joint surfaces, no gap is created between the model joint surfaces or the adhesive protrudes from the joint surfaces.

(Example) An embodiment of the present invention will be described based on the drawings.

The drawing shows an apparatus for implementing the present invention, in which first and second frames 2.3 and a fugitive split model 4a are provided on a base l, and a fugitive split model 4b is provided on the first frame 2. The second frame 3 is provided with an applicator 6 having a heater and a thermocouple (not shown).
is provided so that it can move forward and backward. Engagement surface 6 of applicator 6
a is formed in the same shape as the model joint surface 4c of the fugitive split model 4b, and when the support member 5 is lowered, the fugitive split model 4a
, 4b are formed so as to be integrally joined.

4d is a model joint surface of the evanescent split model 4a.

After attaching the fugitive split models 4a and 4b to the base 1 and the support member 5, an adhesive (
When the adhesive (not shown) is applied, the adhesive (not shown) is kept in a fluid state.
When the support member 5 is lowered to bring the model joint surface 4C of the fugitive split model 4b into surface contact with the engagement surface 6a of the applicator 6, the model joint surface 4c An adhesive (not shown) is evenly applied to the surface.

Thereafter, as the support member 5 rises, the applicator 6 is moved back (to the right in the figure), and the support member 5 descends again to join the fugitive split models 4a and 4b.

A fugitive casting model is obtained in which the adhesive is uniformly applied to the model joint surfaces 4c and 4d.

(Effects of the Invention) According to the present invention, the adhesive can be uniformly applied to the joining surfaces of the models, so there is no occurrence of poor adhesion or adhesive flaking, and there is no need to rework the joined fugitive models. This significantly improves productivity.

[Brief explanation of drawings]

The drawing is a schematic diagram of an apparatus for implementing the invention. 4a, 4b... Disappearing split model, 4c... Model joining surface, 6... Applicator, 6a... Engaging surface.

Claims (1)

[Claims] In a method for bonding fugitive models for casting in which fugitive split models are bonded with adhesive, a fluid adhesive is applied to an applicator having an engagement surface having the same shape as the model bonding surface, and then the engagement 1. A method for bonding fugitive models for casting, which comprises bringing a surface into surface contact with a model bonding surface, uniformly applying an adhesive to the model bonding surface, and then bonding the divided models.