JPH09248652A - Pipe joint casting method - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To manufacture a pipe joint for connecting pipes by a vanishing model casting method, conventionally, the vanishing model is produced according to various connection forms of the pipe joint. Was bulky and needed a large space for its storage,
The present invention solves this problem. A method for casting a pipe joint (10) having a body (11) and connection ports (12, 13) by a vanishing model casting method, wherein a vanishing model (1) comprises a body (2) for casting the body (11). , The connection port models 3 and 4 for casting the connection ports 12 and 13, and the connection port models 3 and 4 are
Regarding the sizes of the pipes P and Q to be connected, A size, B size, and C size are set, which are appropriately selected and combined with the main body model 2 to be used as one vanishing model 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for a water supply pipe or a drain pipe, for example, the size (pipe diameter) of the upstream and downstream pipes to be connected, the connection method, etc. (Also referred to as the "form").

[0002]

2. Description of the Related Art In a building such as a high-rise condominium, for example, a horizontal branch pipe on each floor is connected to a drainage vertical pipe that extends vertically through each floor through a drainage vertical pipe joint, and this drainage vertical pipe is also connected. Is connected to the drainage horizontal main pipe via a substantially L-shaped leg joint. Since the pipe joints such as the drainage vertical pipe joints or the leg joints have various upstream and downstream pipe shapes to be connected, a plurality of types of pipe joints suitable for each of the pipe joints are prepared. .

On the other hand, when a plurality of types of pipe joints are manufactured by the vanishing model casting method (so-called full molding method), a plurality of vanishing models are conventionally prepared in accordance with this.
It was supposed to be a dedicated product for each type of pipe joint.

[0004]

However, regarding the difference in the form of the pipe to be connected, it suffices that the connection port of the entire pipe joint is compatible, and there is a case where the main body part does not need to be particularly changed. In this case, even for the vanishing model for casting this, it suffices to change it according to the form of the pipe to which only the part for casting the connection port is connected, and the main body part does not need to be changed. there were.

However, in the prior art, since the vanishing model has integrally manufactured the portion for casting the main body and the portion for casting the connection port, if the shape of the pipe to be connected is different, such as when the size of the connection port is different, We also made a new disappearance model for the part where the part is cast, which was extremely uneconomical in terms of mold cost, and the space for storing it was also inefficient.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a casting method of a pipe joint which is advantageous in terms of mold cost or storage space.

[0007]

Therefore, the invention according to claim 1 is a method for casting a pipe joint having a main body portion and a connection port by a disappearance model casting method, wherein the disappearance model is characterized by A main body model for casting and a connection port model for casting the connection port are divided, and the connection port model is set in various modes with respect to the form of the pipe to be connected,
It is characterized in that it is appropriately selected and used as one vanishing model in combination with the main body model.

[0008]

According to this method, the main body model of the vanishing model is shared, and only one type is sufficient regardless of the form of the connected pipe. According to this, the number of disappearance models (the number of main body model and connection port model) set for casting a plurality of types of pipe joints can be reduced as compared with the conventional case.

For example, assuming that the upstream and downstream pipes to be connected have three sizes of A size, B size, and C size, respectively, there are 9 types of pipe joints.
It is necessary to set the types, so that in the case of the conventional integrated disappearance model, it is necessary to prepare a total of 9 types of disappearance models. However, according to the method of claim 1, one main body model and two for each size A, B, C (when there are two connection ports) are prepared, so a total of six connection port models are prepared. By doing so, 9 types of forms can be supported. Since only one main body model for casting the main body that occupies most of the pipe joint is sufficient, the storage space can be significantly reduced and the die cost can be significantly reduced. This also applies to the case of dealing with the difference in connection method, and considering not only the size of the pipe to be connected but also the difference in connection method, the difference between the conventional method and the method of the present application is further increased.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
It will be described with reference to FIG. The present embodiment is characterized by the vanishing model itself used in the vanishing model casting method, in which the vanishing model casting method is used in which the molten metal is directly poured into the casting sand without being extracted and extracted. The procedure and the like are not particularly changed, and the description thereof will be omitted.

The vanishing model 1 used in this embodiment has a structure in which the connection port models 3 and 4 are joined to both ends of one body part model 2 as shown in FIG. As shown in FIG. 3, one pipe joint 10 in which the main body 11 and the connection ports 12 and 13 are integrated is cast. As shown, in the present embodiment, a substantially L-shaped leg joint will be described as an example of the pipe joint.

The vanishing model 1 is made of a body part model 2 having a substantially L-shape and a body part model 2 which is a separate body, and is connected to both ends of the body part model 2 during casting. It is composed of models 3 and 4. The main body model 2 is a model for casting the main body 11 of the leg joint 10, the connection port model 3 is a model for casting the upstream side connection port 12, and the connection port model 4 is a downstream side. It is a model for casting the connection port 13 of. The disappearance model 1, that is, the main body model 2 and the connection port models 3 and 4 are made of expanded polystyrene as a conventional material. Moreover, the main body model 2 and the both connection port models 3 and 4 are joined by bonding using a hot-melt type adhesive (pine, varnish, etc.).

The connection port models 3 and 4 are upstream and downstream pipes connected to the leg joint 10 (hereinafter simply referred to as "connection pipes").
Various sizes are set according to the difference in size (pipe diameter), and an appropriate size is selected and used according to the application of the leg joint 10. In the case of the present embodiment, as shown in the drawing, the upstream side connection port model 3 and the downstream side connection port model 4 are set to three sizes of A size, B size and C size with respect to the sizes of the connection pipes P and Q, respectively. Has been done. In the following description, the subscript A is A
The size, the subscript B means the B size, the subscript C means the C size, the first subscript indicates the upstream size, and the second subscript indicates the downstream size.

The A-sized connection port models 3A and 4A have a pipe diameter of 1
Connection port 1 for connecting 25 mm connecting pipes PA and QA
It is selected when casting 2A and 13A,
B size connection port models 3B and 4B are connection ports 12B and 13B for connecting connection pipes PB and QB having a pipe diameter of 100 mm.
It is selected when casting, and the C size connection port models 3C and 4C are connection pipes PC and QC with a pipe diameter of 80 mm.
This is selected when casting the connection ports 12C and 13C for connecting the.

However, as the connection port models 3 and 4, those of A size, B size or C size are selected and used as described above, but the main body model 2 does not depend on the size of the connection pipes P and Q. One kind is used as a common model. For this reason, the diameter d of both joints of the main body model 2 and the diameter d of the joints of the connection port models 3 and 4 of the respective sizes are set to the same dimension so as to be compatible with each other.

As described above, the usage of the leg joint 10, that is, the sizes PA, PB, PC of the upstream pipes connected to both the connection ports 12, 13 and the size QA of the downstream pipes,
Connection model 3 and 4 of vanishing model 1 according to QB and QC
Is selected from A size, B size or C size, and this is joined to both joints of the main body model 2 to form one vanishing model 1, which is embedded in the mold sand as usual to produce a sand mold. However, after that, by performing necessary treatments for the vanishing model casting method such as pouring the molten metal as it is without extracting the vanishing model 1, the leg joints 10 of various sizes according to the application can be obtained. .

For example, as shown in FIG. 2B, the upstream connection port 12 is B size, and the downstream connection port 13 is A size.
When manufacturing a leg joint 10BA of a size, a B-sized connection port model 3B is provided at the upstream joint of the main body model 2.
Are joined together, and the A-size connection port 13A is joined to the downstream joint portion to produce an integral vanishing model 1BA, and casting is performed using this vanishing model 1BA.
It is possible to obtain a leg joint 10BA to which a 0 mm pipe can be connected and which can connect a 125 mm pipe on the downstream side.

In order to cast the leg joint 10AA shown in FIG. 2 (A) in which both the upstream side and downstream side connection ports 12 and 13 are of A size, A is to be joined to the upstream joint portion of the main body model 2. 1AAA of the disappearance model by connecting the connection port model 3A of size and the connection port model 4A of A size to the downstream joint
Can be manufactured, and this can be embedded in mold sand for casting.

Further, as shown in FIG. 2C, the upstream side connection port 12 is C size, and the downstream side connection port 13 is A size.
In order to cast the leg joint 10CA of a size, the C-size connection port model 3C is joined to the upstream joint of the main body model 2 and the A-size connection port model 4A is joined to the downstream joint. The vanishing model 1CA may be constructed.

In the same manner, by using the connection port models 3 and 4 in other combinations in the same manner, six types of disappearance models 1BB, 1CC, 1AB, 1BC, 1CB and 1AC can be set, and thereby connection can be made. Six types of leg joints 10BB, 10CC, 10A regarding the sizes of the pipes P and Q
It is possible to cast B, 10BC, 10CB, and 10AC. In any type of casting, the vanishing model 1
The main body model 2 can be used by sharing one model.

As described above, the disappearance model 1 in this embodiment
Is divided into three parts, a main body model 2 and both connection port models 3 and 4, and both connection port models 3 and 4 are of A size,
Since three types of B size and C size are prepared, it is possible to cast the leg joints 10 of various modes by appropriately selecting these and joining them to both joints of the main body model 2 to integrate them. it can. In the case of the present embodiment, as described above, three sizes are prepared for each of the upstream side connection port model 3 and the downstream side connection port part 4 of the vanishing model 1, so a total of nine types of leg joints (10AA, 10BB). , 10CC,
10AB, 10BA, 10BC, 10CB, 10AC,
10 CA).

Conventionally, these nine kinds of leg joints 10
In order to cope with the above, it was necessary to manufacture nine types of disappearance models, but according to the present embodiment, the main body model 2
It is sufficient to manufacture one model for each model and six models for the connection port models 3 and 4 in total. In this way, since it is possible to support the same type of size combination with a smaller number of models than before, it is possible to reduce the mold cost (production cost of the disappearing models) and store the disappearing models 1-1. You can save a lot of space. In particular, 1
The main body model 2 is commonly used for 9 kinds of sizes, and since the main body model 2 occupies most of the volume of the disappearing model 1, it is possible to reduce the mold cost or save the storage space. I can contribute.

In the above-described embodiment, nine types of leg joints 10 are used for the size (pipe diameter) of the connecting pipes P and Q.
However, the present invention can be applied not only to the difference in size but also to the difference in connection method. In this case as well, one main body model 2 is used as a common model and various forms can be used. By setting a plurality of connection port models that enable the connection method of 1 and using them in combination, it is possible to obtain the same operation and effect as in the case of the size correspondence described above.

For example, FIG. 4 (A) shows a short size leg joint 20, FIG. 4 (B) shows a long size leg joint 25, and FIG. 4 (C) shows a drainage vertical pipe joint 3.
0 is shown. The short size leg joint 20
It has a flange butting type connection port 21 on the upstream side,
It has a plug-in type connection port 22 on the downstream side. The long size leg joint 25 has flange-butting connection ports 26 and 27 on the upstream side and the downstream side, and the drainage stack pipe joint 30 is an upstream insertion system connection port 31 as a drainage stack connection port. And the downstream side flange-butting connection port 32, and the lateral branch pipe connection port includes a flange-butting connection port 33 and a cap nut-type connection port 34. Connection ports 21 and 2 of such various connection methods
Corresponding to 2, 26, 27, 31-34, a connection port model is set, which is appropriately selected and combined with a main body model as a common model to form an integral disappearance model, which is illustrated and illustrated. Different types of pipe fittings can be cast. For example, when casting a leg joint having all cap nut type connection ports, or when casting a drainage vertical pipe joint having a flange butt type connection port on the upstream side connection port, the main body model, One model can be shared, and the same effect can be obtained.

Further, the leg joints 10 and 2 which are substantially L-shaped
Although 0 and 25 have been described as an example, for example, a straight pipe joint or a T-shaped pipe joint (in this case, three connection ports)
Similarly, it is also applicable to a drainage vertical pipe joint having two connection ports for connecting upstream and downstream drainage vertical pipes and a plurality of connection ports for connecting lateral branch pipes. Applicable. Furthermore, not only for pipe joints for drainage pipes,
It is a pipe joint for water supply pipes or gas pipes, and can be widely applied to pipe joints manufactured by the disappearance model casting method.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention and is a diagram showing a vanishing model in which connection ports of three sizes are set on both the upstream side and the downstream side.

FIG. 2 is a diagram showing three types of leg joints for combinations of connection port sizes, and (A) shows a leg joint 10AA in which both upstream and downstream connection ports have A size;
In (b), the upstream connection port is B size, and the downstream connection port is A size leg joint 10BA, and in (c), the upstream connection port is C size and the downstream connection port is 1 shows an A size leg joint 10CA.

FIG. 3 is a diagram showing a leg joint and upstream and downstream connecting pipes connected to the leg joint.

4A and 4B show connection ports having different connection systems, in which FIG. 4A shows a short size leg joint, FIG. 4B shows a long size leg joint, and FIG.

[Explanation of symbols]

1 ... Disappearance model 2 ... Main body model 3 ... Upstream side connection port model 4 ... Downstream side connection port model 10 ... Leg joint (1st subscript indicates the size of upstream side connection port, 2nd subscript is downstream) The size of the connection port on the side is shown) 11 ... Main body part, 12 ... Connection port on the upstream side, 13 ... Connection port on the downstream side A ... A size (pipe diameter 125 mm) B ... B size (pipe diameter 100 mm) C ... C Size (pipe diameter 80 mm) P ... upstream connecting pipe, Q ... downstream connecting pipe 20 ... short size leg joint 25 ... long size leg joint 30 ... drainage vertical pipe joint

Claims (1)

[Claims] 1. A method for casting a pipe joint having a main body portion and a connection port by a vanishing model casting method, wherein the vanishing model casts the main body portion model for casting the main body portion and the connection port. The connection port model is divided into various models with respect to the shape of the pipe to be connected, and is appropriately selected and used in combination with the main body model as one vanishing model. A characteristic method for casting pipe joints.