JPH0596341A - Lost foam pattern for casting drainage collecting pipe and method for casting drainage collecting pipe using the pattern - Google Patents

Abstract

PURPOSE:To simplify the control of a pattern by sticking the base end side of a pipe pattern with step formed so that the center directional lines of both end opening parts become mutually parallel to an opening hole connecting part formed as upward inclining state at the side part of a main body pattern in a drainage collecting pipe. CONSTITUTION:The lost foam pattern 1 for drainage collecting pipe is composed of foamed synthetic resin of polystyrene, etc. The lost foam pattern 1 is provided with the main body pattern 4 and the pipe pattern 5 with step for projected to the side part of the main body and these patterns 4, 5 are formed with the separated metallic mold as one block to each. The main body pattern 4 provides a large diameter part 6 and a tapered tube part 7 and at the side wall of the large diameter part 6, the opening hole connecting part 8 is arranged. This opening hole connecting part is formed as upward inclining state so that the plane S1 containing the opening hole and surface shifts by angle alpha to the pipe axial direction (l1). By sticking the base end side of the pipe pattern 5 with step to the opening hole connecting part 8 in the main body pattern 4 with adhesive, etc., the lost foam pattern 1 for drainage collecting pipe is constituted. By this method, the control of the pattern is simplified and manufacturing cost of the metallic mold is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vanishing model for casting a drainage collecting pipe and a method for casting a drainage collecting pipe using the model.

[0002]

2. Description of the Related Art Conventionally, in the casting of the above-mentioned drainage collecting pipe, a lost model made of expanded synthetic resin such as expanded polystyrene is embedded in foundry sand (dry sand) to form a mold, and molten metal is A method of casting a casting by pouring into a lost model and burning and vaporizing the model to replace the lost model with molten metal, that is, a so-called full mold casting method is adopted.

The vanishing model used in this full-molding method is generally integrally molded by a molding die according to the shape of the casting, but when the outer shape of the drainage collecting pipe is complicated, In some cases, the model cannot be integrally molded due to restrictions in manufacturing the model die. That is, for example, when projecting a stepped branch pipe connection part from the side part of the drainage collecting pipe, the main body model of the collecting pipe and the stepped pipe model are molded by different molds. It was decided to use the disappearing model of the integrated drainage collecting pipe for the casting by the full-molding method by fixing the two together with an adhesive or the like and integrating them.

[0004]

By the way, since the connecting height of the branch pipe connected to the drainage collecting pipe varies depending on the construction site, the mounting height of the branch pipe connecting portion can be changed. It is necessary to make a constant elevation angle according to the inclination of the branch pipe.

However, in the prior art, since the height adjustment and elevation angle setting of the branch pipe connection portion were all performed by changing the shape of the stepped pipe model, many molds for molding the model were used. It was necessary, and its management was troublesome, and it was a cause of rising die manufacturing costs. In view of such circumstances, an object of the present invention is to make it possible to set the height of a branch pipe connecting portion and the elevation angle at the same time with only one type of vanishing model.

[0006]

[Means for Solving the Problems] In order to achieve the above object,
The present invention has taken the following technical means. That is, according to the invention of claim 1, the base end side of the stepped pipe model 5 formed so that the central direction lines l ₂ and l _{3 of the} openings at both ends are parallel to each other is the main body model 4 of the drainage collecting pipe. It is characterized in that it is fixed to the opening connection portion 8 formed in the side portion of the so as to be inclined upward.

Further, the invention according to claim 2 is a method for casting a drainage collecting pipe by a full mold method in which a drainage collecting pipe is cast by replacing a vanishing model buried in foundry sand with molten metal. In the model 1, the base end side of the stepped pipe model 5 formed so that the center lines l ₂ and l _{3 of the} openings at both ends are parallel to each other is inclined upward to the side of the main model 4 of the drainage collecting pipe. It is characterized in that it is fixed to the opening connection portion 8 formed in a shape.

[0008]

As shown in FIG. 3, the mounting height h of the branch pipe connecting portion 9 is changed by changing the mounting angle of the stepped pipe model 5. At this time, in the present invention, the opening connection portion 8 on the main body model 4 side is formed in an upwardly inclined shape, and in the stepped pipe model 5, the center direction lines l ₂ and l _{3 of the} opening portions at both ends are parallel to each other. Since it is formed as described above, the elevation angle β of the branch pipe connection portion 9 is always kept constant.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In the figure, 1 indicates a disappearance model of the drainage collecting pipe, which is made of foamed synthetic resin such as polystyrene. The vanishing model 1 includes a drainage collecting pipe main body model 4 having vertical pipe connecting portions 2 and 3 at upper and lower ends thereof, and a stepped pipe model 5 projecting from a side portion of the main body model 4. And those models 4,5
Are integrally molded in separate molds.

The main body model 4 is integrally provided with a large-diameter portion 6 having a diameter larger than that of the vertical pipe connecting portion and a taper pipe portion 7 below the large-diameter portion 6 in the middle of the pipe axial direction. The side wall of 6 is provided with an opening connecting portion 8 to which the stepped pipe model 5 is joined. The opening connecting portion 8 is formed in an upwardly inclined shape so that the plane S ₁ including the opening end face thereof is displaced by an angle α with respect to the tube axis direction l ₁ .

The stepped pipe model 5 is formed by bending in opposite directions to each other in the middle of the pipe axial direction, has a substantially S shape in a side view, and has a first pipe portion 10 having a branch pipe connecting portion 9 at its tip, The first pipe part (10) and the second pipe part (11) having different axes are integrally formed. That is, in this stepped pipe model 5, the center line l ₂ of the first pipe portion 10 (the center line of the tip opening portion) and the center line l ₃ of the second pipe portion 11 (of the base opening portion) (Center direction line) are formed so as to be parallel to each other, and therefore the plane S ₂ including the open end face on the base end side is defined by the center direction line l.
It is set to be perpendicular to ₂ and l ₃ .

Then, as shown in FIG. 1, the base end side of the stepped pipe model 5 is fixed to the opening connection portion 8 of the main body model 4 with an adhesive or the like, so that as shown in FIG. Disappearance model 1 of the collecting pipe is constructed. At this time, the opening connecting portion 8
Is inclined upward, and the stepped pipe model 5 is formed such that the center lines l ₂ and l _{3 of the} opening portions at both ends thereof are parallel to each other. Therefore, as shown in FIG. Model 5
The angle of elevation β of the branch pipe connection 9 is changed to the angle of inclination α of the opening connection 8 by changing the mounting angle of the
While maintaining the same as above, the mounting height h of the branch pipe connection part 9
Can be variously changed.

Therefore, if one main body model 4 and one stepped pipe model 5 are prepared, the height h of the branch pipe connecting portion 9 and the elevation angle β can be set at the same time by changing the mounting angles. Can be done. In the above embodiment, the opening connection portion 8 of the main body model 4 and the base end portion of the stepped pipe model 5 are joined in a butt shape, but they may be connected in a fitting manner. Good.

[0014]

According to the present invention, the height h adjustment of the branch pipe connecting portion 9 and the elevation angle β can be achieved with only one type of the main body model 4 and the stepped pipe model 5.
Since setting and setting can be performed at the same time, simplification of model management and reduction of die manufacturing cost can be achieved.

[Brief description of drawings]

FIG. 1 is a side sectional view of a vanishing model of a drainage collecting pipe.

FIG. 2 is a side sectional view of the same.

FIG. 3 is a front view of the same.

[Explanation of symbols]

1 Disappearance model 4 Main body model 5 Stepped pipe model 8 Opening connection l ₂ Center line l ₃ Center line

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hirofumi Nishii 1-247 Shikitsu, Naniwa-ku, Osaka City, Osaka Kubota Corporation

Claims (2)

[Claims] 1. A main body model of a drainage collecting pipe is a base model side of a stepped pipe model (5) formed so that center lines (l ₂ ) (l ₃ ) of openings at both ends are parallel to each other. Disappearance model for casting of drainage collecting pipe, characterized in that it is fixed to an opening connection portion (8) which is formed in an inclined shape on the side of 4). 2. A method for casting a drainage collecting pipe by a full mold method, in which a vanishing model buried in foundry sand is replaced with molten metal to cast a drainage collecting pipe, wherein the vanishing model (1) has openings at both ends. Center direction line (l ₂ )
Stepped tube model formed so that (l ₃ ) are parallel to each other
Casting of a drainage collecting pipe characterized in that the proximal end side of (5) is fixed to an opening connection part (8) formed in an upward slanted shape on the side part of the main body model (4) of the drainage collecting pipe. Method.