JPH0547305B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold filling device for pipe casting, which can realize accurate pipe position dimensions and has extremely high mold production efficiency.

Conventionally, when manufacturing equipment component castings that require a heat exchange medium to be circulated inside the thick walls or machine component castings that require built-in oiling holes, pipes such as steel pipes and copper pipes are placed inside the castings. It was widely practiced to simplify the casting process and subsequent machining by encasing the metal, thereby improving production efficiency. For example, this cast-in method has been applied to the manufacture of staves installed between the lining bricks and the steel shell to cool the walls of blast furnaces for iron-making, and has achieved great success.

By the way, it goes without saying that the quality of cast members made by casting pipes such as steel pipes and copper pipes into cast iron, cast steel, and other castings is greatly affected by the dimensional accuracy of the positional relationship between the pipe and the casting body. That's true. However, the conventional pipe casting manufacturing method that has been commonly used in the past involves first molding a mold with a hole for inserting the pipe, then inserting the pipe into the hole, positioning it, and then pouring the molten metal. Since it is extremely difficult to set the pipe in the correct position in the mold cavity, it is difficult to stably manufacture pipe castings with accurate dimensions, and the efficiency of mold manufacturing is also extremely low. It was hot.

Therefore, in order to eliminate these inconveniences, a mold filling device for pipe casting as shown in Fig. 1 has been proposed and put into practical use (see Japanese Patent Publication No. 4456/1983). .

The apparatus shown in FIG.
When making a mold, first insert the cast-in pipe 2 into the model 4, and then use the jig 3 inside the model 4 to insert the cast-in pipe 2 into the mold. Determine the position of pipe 2, and place casting flask 1
After the cast-in pipe 2 is installed, the rising portion of the cast-in pipe 2 is fixed with a tightening bolt attached to a jig 5 fixed to the casting flask 1, and then molding sand is filled. The symbol 6 in FIG. 1 is a protective tube provided to protect the cast-in pipe 2, and has rings 7 and 8 for centering the cast-in pipe. .

If this device is used, the foundry sand will be packed around the cast-in pipe 2 or the protective tube 6, which is different from the conventional method of inserting the pipe into the hole after molding a mold with a pipe insertion hole. In comparison, the fixing and positioning of the pipe is more complete, and the positioning can be performed with high dimensional accuracy.

After filling the mold, the upper mold 9 is removed, and then the model 4 is removed. At this time, the cast-in pipe 2 fixed by the cast-in pipe fixing jig 5 is
It is to be held in the flask 1 in a state where it is exposed on the lower surface of the upper mold 9.

The upper mold 9 of the mold thus obtained is set on the lower mold 10 from which the model 4 has also been removed, and molten metal is poured into the formed cavity.

It is true that the apparatus described in Japanese Patent Publication No. 50-4456 was able to efficiently manufacture pipe castings with higher dimensional accuracy than previous methods, but During the normal process of applying vibrations and other mechanical external forces to the flask when removing hot water and solidified products from the flask, the flask becomes distorted and becomes fixed in the flask. Careful investigation into the present invention has revealed that this causes extremely inconvenient troubles such as disrupting the positional relationship of the jig and deteriorating the positional accuracy of the cast-in pipe. It was.

The present invention solves the problems of the prior art as described above, and provides a mold that can efficiently and stably manufacture a pipe cast body with an accurate positional relationship between the cast bodies of the pipe over a long period of time. The company provides a mold filling device for pipe casting, and its features include a surface plate equipped with a protrusion on the top surface for fitting a pipe positioning and fixing jig; , a pipe positioning/fixing jig fitted to the protruding part of the surface plate, a model containing a receiving jig for the cast-in pipe and placed and fixed on the surface plate, and a model mounted on the surface plate. It is characterized in that it is constructed with a casting flask that holds molding sand of a size that can simultaneously surround all the protrusions provided.

In other words, the major feature of the pipe casting mold filling device of the present invention is that the pipe positioning/fixing jig and the flask are separated and independent, so that the deformation of the flask does not affect the jig. We have it.

FIG. 2 is a schematic configuration diagram showing an example of a mold filling device for pipe casting according to the present invention. This device is a device for inserting an upper mold for pipe casting, and is equipped with a protruding portion 13 on the upper surface for fitting a jig 12 for positioning and fixing a casting pipe 11, and a model. A surface plate 14 having a concave fixing portion 27 into which the surface plate 16 can be fitted and fixed, and a protruding portion 1 of the surface plate
3, a model 16 containing a receiving jig 15 for the cast-in pipe 11 and placed and fixed on the surface plate 14, and the surface plate 14. It mainly consists of a molding flask 18 that holds molding sand 17 of a size that can simultaneously surround all the protrusions 13 provided on the surface plate 14. After fitting and fixing the model 16 to the fixing part 27, inserting the cast-in pipe 11 into the model 16,
The position of the pipe is determined by the receiving jig 15 in the model 16, and then the pipe positioning/fixing jig 12 is attached to the protrusion 13 of the surface plate 14 via the fitting aid 19.
to position and fix the rising part of the cast-in pipe 11. The pipe casting mold inserting device shown in FIG. 2, which is capable of inserting the upper mold into the mold, has the above-described configuration. The pipe can be positioned by fitting the pipe positioning/fixing jig 12, and furthermore, the model 16 can be positioned by fitting and fixing the model 16 into the concave fixing part 27 provided on the surface plate 14. The positional relationship between the pipe positioning/fixing jig 12 and the model 16 can always be kept constant even if troubles such as deformation of the flask 18 occur.

Note that the positioning and fixing of the rising portion of the pipe must be performed accurately using the auxiliary jig plate 20 attached to the pipe positioning/fixing jig 12, and for this purpose, the auxiliary jig plate 20 is It is desirable to have a structure as shown in FIG. That is, FIGS. 3 and 4 show different examples of the configuration of the vicinity of the auxiliary jig plate in which the cast-in pipe 11 is positioned and fixed. Cast-in pipe 11 and auxiliary jig plate 2
Position the pipe by inserting a wedge 21 between the
Fig. 4 shows an auxiliary jig plate 20 that performs fixing.
A flange 22 is provided on the flange 22, and positioning and fixing are performed using tightening bolts 23.

In order to form an upper mold using the mold filling device for pipe casting of the present invention, molding sand 17 is poured into a space defined by a casting flask 18 placed on a surface plate 14 and tamped. Afterwards, the mold after molding is removed from the surface plate 14 and used as an upper mold. If this upper mold is set on a lower mold having a recess made with a separate device (this recess has the same shape and dimensions as the recessed fixing part of the surface plate 14), the mold can be cast regardless of the deformation of the flask 18. A pipe casting mold in which the wrapped pipe 11 is accurately positioned can be formed.

In FIG. 2, the reference numeral 24 is a pipe protection tube having cast-in pipe center positioning rings 25 and 26, similar to that in FIG.

In this way, the jig 12 for positioning and fixing the pipe is completely independent from the casting flask 18, so even if the casting flask is not affected by vibrations when removing the poured and solidified product. Even if deformation occurs, the positioning function of the jig 12 will not be affected in any way.

In addition, if the jig 12 for positioning and fixing the pipe is not necessary, it can be removed after molding with molding sand, and furthermore, after removal, there is a risk that various deformations will occur in the cast-in pipe during casting. If the jig 1 comes out, at that point, use the jig 1 again.
2 can also be fitted and used as a correction jig.

FIG. 2 shows a concave fixing portion 2 provided on the surface plate 14.
This is a device for fitting and fixing the model 16 to the fifth
As shown in the figure, a surface plate 1 having a protrusion 13'
4' has a built-in receiving jig 15 for the cast-in pipe 11, and a model 16 that is positioned, placed, and fixed.
It is also possible to make a mold for pipe casting.

As described above, according to the present invention, it is possible to efficiently and efficiently produce a pipe casting mold that can produce pipe castings with high dimensional accuracy without being affected by the flask, which tends to deform during repeated use. This provides industrially useful effects such as stable production over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a conventional example of a mold filling device for pipe casting, FIG. 2 is a schematic configuration diagram showing an example of the mold loading device for pipe casting of the present invention, and FIG.
Figure 3 is a schematic configuration diagram showing an example of the configuration near the auxiliary jig of the device of the present invention, Figure 3 a is a plan view thereof, Figure 3 b
4 is a cross-sectional view taken along the line A-A in FIG. 4b is a sectional view taken along the line BB in FIG. 4a, and FIG. 5 is a schematic configuration diagram showing another example of the mold filling device for pipe casting of the present invention. In the drawings, 1...Cast flask, 2...Cast-in pipe, 3...Receiving jig, 4...Model, 5...Pipe fixing jig, 6...Protective pipe, 7, 8...Cast-in pipe Center positioning ring, 9... Upper die, 10...
Lower mold, 11...Cast-in pipe, 12...Pipe positioning/fixing jig, 13, 13'...Protrusion part,
14, 14'... Surface plate, 15... Receiving jig, 16
... Model, 17 ... Molding sand, 18, 18' ... Casting flask, 19 ... Fitting aid, 20 ... Auxiliary jig plate,
21... Wedge, 22... Flange, 23... Tightening bolt, 24... Protection tube, 25, 26... Ring for positioning the center of the cast-in pipe, 27... Concave fixing part.

Claims (1)

[Claims] 1. A surface plate having a protrusion on its upper surface for fitting a pipe positioning/fixing jig, a pipe positioning/fixing jig fitted to the protrusion of the surface plate,
It has a built-in receiving jig for the cast-in pipe and holds a model that is placed and fixed on the surface plate and molding sand large enough to simultaneously surround all the protrusions provided on the surface plate. A mold loading device for pipe casting, characterized by comprising a casting flask.