JPS5934461B2 - Imonoyoumokei - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an assembly mold model for forming the base of a large and heavy object such as a surface plate or bed plate.

Conventionally, in the case of a wooden model 1 for forming a base such as a surface plate, the wooden model 1 formed as shown in FIG. It was divided along the ho.

However, there was a drawback in that there were many divisions (indicated by thick solid lines C, 2, and E), which caused wobbling, resulting in large dimensional errors in the formed product.

Further, as shown in FIG. 7 (Japanese Utility Model Publication No. 47-37812), a part of the outer peripheral surface of the solid wooden model 1 is dug, and the projecting piece 2 is fitted into the recess 23. A magnet 20 is buried in one of the model 1 and the protruding piece 2, and an iron piece 21 is embedded in the other, and the iron piece 21 is attracted by the magnet 20 to attach the protruding piece 2 to the recess 23 of the wooden model 1. Was.

In such conventional examples, since the wooden model 1 was solid, it became heavy and difficult to transport as it became large, and internal stress increased, making it prone to deformation.

The present invention has been made in view of the above points, and the object of the present invention is to reduce the number of cutting points, improve dimensional accuracy, and have sufficient strength, and furthermore, provide a wooden model with recesses on the outer peripheral surface. Even if the wooden model is removed smoothly from the mold, it is lightweight and easy to handle even though it is a large wooden model, and the internal stress is greatly alleviated to prevent distortion. In addition, it is an object of the present invention to provide a model for assembly molds that is convenient to transport and does not damage the surface.

The present invention will be explained in detail below with reference to Examples.

The upper surface of a large, substantially rectangular wooden model 1 for forming a surface plate is provided with round bowl-shaped recesses 4 that face each other, and projecting pieces 2 are provided on both side edges and both end edges of the wooden model 10. 2 are provided protruding from each other, and a pair of grooves 3, 3 having a semicircular cross section are bored on both side edges of the wooden model 1, respectively.

As described above (the wooden model 1 is formed, the projecting pieces 2, 2...
The base of the is divided by dividing lines 5, 5, etc. indicated by thick solid lines, and the upper surface side of the grooves 3, 3, etc. are shown in FIG.
As already shown in FIG. 2, it is divided along dividing lines 6, 6, .

The lower surface side of the groove 3 may be divided along the dividing lines 6, 6, . . . .

Further, the connecting portion 7 indicated by the chain line in the drawing is a place where a core to be separately cored is inserted, and no holes are made in the wooden model 1.

Furthermore, the wooden model 1 has 1 to 15 for pulling out the wooden model 1.
Of course, the wooden model 1 has a draft angle of about 1 m.
The inside of the ingot case is hollow, as shown in Figure 3, in order to reduce the weight and material of the ingot case, and a plurality of reinforcing bars 8゜8... are installed inside. .

Furthermore, as shown in Fig. 3, a hole communicating with the interior is bored in the appropriate position of the wooden model 1, and a removable raised plate part 9, 9 is attached to this hole to close the hole. be.

Then, the perforated plate parts 9, 9 are removed to open the holes, and by hooking a lifting tool to the reinforcing bars 8, 8 through the holes, the wooden model 1 can be moved up and down with a crane or the like.

Further, when used for forming a mold, the hole is closed with raised plate portions 9, 9.

To form the mold, sand 12 is filled in the lower frame 11 as shown in FIG. 4a to make the upper surface flat, the wooden model 1 is placed on the flat sand 12, and Place the middle frame 13 at the same height as the wooden model 1, and fill the middle frame 13 with sand 1.
Insert 2.

At this time, the projecting pieces 2, 2... and the recessed groove die cutting piece 10,
10... are dividing lines 5, 5... and 6, 6..., respectively.
It is joined at.

For example, as shown in FIGS. 2a and 2b, this connection is performed by
Dovetail protrusions 24 on 2... and concave groove die cutting pieces 10, 10...
Provided with protruding pieces 2, 2... and recessed groove die cutting pieces 10.10.
A dovetail groove 25 is provided on the side where the dovetail protrusion 24 and the dovetail groove 25 are attached, and the dovetail protrusion 24 and the dovetail groove 25 are fitted together and joined by a so-called dovetail joint.

Next, as shown in FIG. 4, an upper frame 14 is placed on this middle frame 13.
and fill the sand 12 into the upper frame 14.
A sprue 15, a runner 16, etc. are formed inside.

Although not shown in the drawings, a feeder channel, gas vent hole, etc. may be provided as necessary.

After that, pull out the upper frame 14 upwards, and insert the middle frame 1 from above the lower frame 11.
The wooden model 1 is pulled out by lifting up the wooden model 1. At this time, the wooden model 1 falls out due to its own weight, and the projecting pieces 2, 2,
...and groove die cut piece 10.10...Which joint comes off?
Projecting pieces 2, 2 located on the upper surface side of the sand 12 in the middle frame 13
...and the concave groove die cut piece 10°10...the ridge remains in the sand of the middle frame 13.

After that, the middle frame 13 is lowered, and the projecting pieces 2, 2... and the groove-shaped cut pieces 10, 10... remaining in the sand 12 of the middle frame 13 are pulled out upward to create a space of a predetermined shape. form.

Next, the fitting portions 7, 7, etc. in Fig. 1 a, b, c)
A separately-separated sand mold core 26 formed into the shape shown in Fig. 4C
As shown in the figure, the lower frame 11 is placed on the sand 12 and set, and the middle frame 13 is placed on the lower frame 11.

When setting the sand mold core 26, it is adhered with glue.

Thereafter, the upper frame 14 is set on the middle frame 13 to form a mold as shown in FIG. 4d.

Figures 5a, b, and c show other embodiments described above, and are wooden models 1 for forming the base of heavy objects such as tabletops, as shown in the previous embodiments. protruding piece 2,
2... and the concave groove die cut piece 10°10... at the dividing line 5
, 5... and 6, 6....

As described above, the present invention has the following advantages: (compared to the past, the wooden model has fewer parts to be divided and the main body part is unified, so the wobbling of the divided parts is much less than before, and the main part of the product is The dimensions of the wooden model can be formed with high accuracy, and the projecting piece is divided along the outer circumferential line of the wooden model, and the outer circumferential part of the wooden model is divided so that the upper surface side or the lower surface side of the groove can be opened. Therefore, the wooden model can be removed smoothly at least at the dividing point.

In addition, since the inside of the wooden model is hollow and multiple reinforcing bars are installed inside, it is possible to reduce the amount of material used for the wooden model, and of course the wooden model is lightweight and easy to handle. Unlike a solid wooden model, the internal stress is greatly alleviated, and it has the advantage that it will not warp even in the case of a large wooden model used to form the base of a heavy object such as a surface plate or base plate. Since a removable lifting board is provided at the appropriate location on the model, the wooden model can be raised or lowered by removing the opening board and hooking the lifting tool onto the reinforcing crosspiece, making it easy to transport the wooden model, etc. By hooking the hanging tool that is most likely to damage the surface of the wooden model onto the internal reinforcing crosspiece, the hanging tool is prevented from hitting the surface, and there is no risk of damaging the surface of the wooden model. be.

[Brief explanation of the drawing]

Figures 1a, b, and c are a plan view, a front view, and a side view showing an embodiment of the present invention, Figure 2a is a partially exploded schematic perspective view showing a state in which the above protruding pieces are joined; Fig. 3 is an exploded schematic perspective view showing a state in which the grooved die cutting pieces of the above are joined together; Fig. 3 is a partially cutaway schematic perspective view showing the inside of the wooden model of the same; Fig. 4;
Figures a, b, c. d is a schematic sectional view showing a state in which the same mold is formed;
Figures a, b, and c are plan views, front views, and side views showing other embodiments of the same as above; Figures 6 a, b, and c are plan views showing a conventional example;
A front view and a side view, and FIG. 7 is a vertical cross-sectional view showing another example of the conventional example, in which 1 is a wooden model, 2 is a projecting piece, 3 is a groove, 1
0 is a concave groove die cut piece.

Claims (1)

[Claims] 1. A mold with protrusions protruding from the outer periphery of a large, approximately rectangular wooden model for forming the base of large, heavy objects such as surface plates and bed plates, as well as grooves formed on the outer periphery of the wooden model. In the model for use, the projecting piece is divided along the outer periphery of the wooden model,
The outer periphery of the wooden model is divided to form a groove cutout piece so that the upper surface side or the lower surface side of the groove can be opened, the interior of the wooden model is made hollow, and a plurality of reinforcing bars are installed inside. A model for an assembly mold, characterized in that a removable opening plate part is provided at an appropriate position on the wooden model.