JPH0524497Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a cutting die that is attached inside the tip of a tile extrusion molding machine and forms the back groove of the tile.

(Prior Art) Generally, a plurality of back grooves 100 are formed on the back surface of a tile, as shown in FIG. This is to allow an engaging member to engage with the back groove 100 or to allow a fixing material such as mortar to bite into the back groove 100 when tiling the tiles.

By the way, this kind of tile 10 as an extrusion molded product
No. 2 had a problem in that the surface and side surfaces were deformed in a wavy manner as shown in FIG. 11 due to the formation of the back groove 100.

Such back-grooved tiles 102 generally have
It is obtained by extruding two tiles together from a die at the tip of an extruder and then separating them into individual tiles.During the extrusion, there is a mold inside the tip of the extruder as shown in Figure 12. A cutting die 104, that is, a plurality of molding parts 108 consisting of a support rod 106 and a molding part 108 having a cross-sectional shape corresponding to the back groove (110 in the figure is a thin fin part for forming cuts to separate two tile molded bodies). A cutting die 104 equipped with punched balls 112 is arranged, and each punched ball 112 of this cutting mold 104 forms the back groove of the tile. This causes a large resistance to the flow of the raw material in the part where the punched balls 112 are located and the part between them, and this causes the raw material density of the molded body to be lower than that in the part with the back groove 100 and the part with the back groove. 100 (i.e., the part of the sole 114), the shrinkage rate becomes uneven when the tile 102 is dried or fired, and the waveform deformation as described above occurs. It is.

(Means for Solving the Problems) The cutting die of the present invention was devised to solve such problems, and its gist is that the cutting die of the present invention is disposed inside the tip of an extrusion molding machine, and A cutting die for forming each back groove of a tile when two tiles are formed by continuously extruding the kneaded base material from a die at the tip, and a support rod extending in the extrusion direction of the base material. and a molded part provided at the tip of the support rod, and the molded part has a hollow frame shape having an outer frame having a shape corresponding to the back groove.

(Operation and effect of the invention) In the present invention, the forming part of the punched ball, which becomes a large resistance part when extruding the base material, has a hollow frame shape, so the base material passes through the hollow part and is extruded to the outside. It can be done. That is, in the cutting die of the present invention, this forming part does not become a large resistance part to the flow of the base material. For this reason, the difference in the flow speed and degree of compression of the base material is reduced between the part where the punched balls are arranged and the part between them, and the difference in the flow speed and degree of compression of the base material is reduced, and the part where the back groove is formed in the tile molded product and the part between them, that is, the back The density of the raw material is equalized between the legs and the legs. Therefore, when such a tile is dried and fired, the shrinkage rate is also equalized, and the undulating deformation due to uneven shrinkage as described above does not occur.

(Example) Next, an example of the present invention will be described in detail based on the drawings.

2 and 3 show the tip of the extrusion molding machine, and in the figures, 10 is a cylindrical body, and an iron plate 12 having a hollow hole is fixed to the cylindrical body 10.
A tile forming die 14 is attached to this iron plate 12. The die 14 has a molding recess 16 with a rectangular cross section for molding two tiles together, as shown in FIG.

A cutting die 18 is disposed inside the cylindrical body 10, and a part of the die 18 extends into the inside of the die 14. As shown in FIG. 1, the cutting die 18 includes a main body 20 for fixing, a plurality of main punching balls 22 for forming each back groove of the tile, and intermediate punching balls arranged between these main punching balls 22. 24. The main punched ball 22 has a support rod 26 extending in the axial direction of the cylinder 10.
and a molded part 28 provided at its tip. The support rod 26 is formed to have a thinner overall thickness than the support rod of a conventional main punched ball, and has a thinner portion 31 at a certain length just before the forming portion 28. The molded part 28 includes an outer frame part 30 shaped to correspond to the back groove of the tile, and a thin part 31 of the support rod 26.
It has a hollow frame shape with a central fixing part 32 having the same cross-sectional shape as the fixing part 32.
It is fixed to the tip of the support rod 26 by a bolt 34. Note that thin fin portions 35 are provided at vertically intermediate positions on both left and right side surfaces of the molded portion 28 . The fin portion 35 is for making a cut for separating two tiles molded together.

The intermediate punched ball 24 includes a support rod 36 extending in the axial direction of the cylindrical body 10 and a molded portion 3 provided at the tip thereof.
8. As shown in FIG. 4, the support rod 36 has approximately the same thickness as the support rod 26 of the main punched ball 22, and has a thinner portion 40 at the tip end at the same position as that of the main punched ball 22. Molding part 3 as it is
It continues to 8.

As shown in FIGS. 4 and 5, the forming portion 38 has a rectangular cross-section that is narrower and thinner than the forming portion 28 of the main punched ball 22. In this intermediate punched ball 24 as well, thin fin portions 42 are provided at upper and lower intermediate positions on both left and right side surfaces of the molded portion 38.
The function of this fin portion 42 is similar to that of the fin portion 35 of the main punched ball 22.

In the cutting die 18 of this example, one resistance plate 44 is arranged on the upper and lower sides of the main body 20, and a base material is placed at each outer position of the main cutting balls 22 at both end positions according to the shape of the tile. An end rod 46 is provided to regulate the flow of the raw material.

Next, the operation of the cutting die 18 of this example will be explained.

When a tile is extrusion-molded using the cutting die 18 of this example, the flow of the raw material is largely divided into upper and lower halves by the main body 20 of the cutting die 18 and the upper and lower resistive plates 44, and these main bodies 20, resistors Board 44
, and flows to the side of each punched ball 22 and 24.
At this time, the space above and below the base end portion of the support rod of each punched ball 22, 24 becomes a dead space, and not much raw material flows into this space.

Now, the raw material that has flowed to the side of the punched balls 22 and 24 is extruded from the tip of the die 14 and is formed into two tiles. The back groove of the tile is formed when the raw material passes through the molding section 28 of the main punched ball 22, but the conventional molding section of the main punched ball does not pass through the molding section 28.
It has a solid shape with the same size as the molding section, and therefore, when the raw material passes through this molding section, it is subjected to a large flow resistance and at the same time a strong compressive force. On the other hand, in the cutting die 18 of this example, the molding part 28 has a hollow frame shape and the base material can pass through the hollow part between the outer frame part 30 and the central fixing part 32. The molded portion 28 is not subjected to large flow resistance or large compressive force. Moreover, in this example, an intermediate punched ball 24 is disposed between the main punched balls 22 and 22, and the flow resistance and compression of the raw material are reduced by the back groove forming portion and the portion between them (that is, the sole foot portion). In addition, since the support rod 26 in the main punched balls 22 is formed thin like the intermediate punched balls 24, the raw material is The flow is balanced. Therefore, the raw material density of the molded tile is equalized between the back groove forming part and the sole foot part, and therefore the shrinkage rate when the molded tile is dried or fired is equalized, resulting in the wavy deformation as described above. do not have.

The above is an example of molding a flat tile, but the present invention molds an L-shaped curved tile 58 having a first piece 60 and a second piece 62 as shown in FIG. It is also applicable when

This L-shaped tile 58 is generally extruded into two pieces as shown in FIG.
Thereafter, each tile 58 is separated. FIG. 8 shows a cutting die for forming the back groove 64 of each tile 58 during extrusion molding.
It has two punched balls 48. Each punched ball 48 has a pair of back groove forming portions 52 provided at the tip of the support rod 50 via a support rod 50 and a block 54. The molding part 52 is composed of an outer frame part 55 and a base plate part 56, and is fixed to the block 54 at the base plate part 56.

Conventionally, when molding such an L-shaped curved tile 58 with a back groove 64, a punched ball 116 having a solid shaped molding part 118 is used as shown in FIG. 118 caused a large flow resistance, but in the punched ball 48 of this example, since the molding part 52 has a hollow frame shape, the flow resistance of the raw material does not occur in this part, and therefore, the same as above. For this reason, the L-shaped curved tile 58 does not undergo wavy deformation.

Although the embodiments of the present invention have been described in detail above, the present invention can also be configured in other forms.

For example, in the above example, flat tiles and L-shaped curved tiles were explained as examples, but the present invention can also be applied to extrusion molding tiles of various other shapes, and the shape of each punched ball in the cutting die can be applied to tiles. The present invention may be constructed with various modifications without departing from the spirit thereof, such as making it into other forms depending on the shape, or omitting the intermediate ball in the above example. is possible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main part of a cutting die which is an embodiment of the present invention, and FIGS. 2 and 3 are a front view and a partially cutaway plan view of the main part of an extrusion molding machine including the cutting die.
4 and 5 are a plan view and a front view of main parts of the cutting die shown in FIG. 1, FIG. 6 is a perspective view showing an example of an L-shaped curved tile, and FIG. 7 is a perspective view of the curved tile. A cross-sectional view of the molding stage by an extrusion molding machine, FIG. 8 is a perspective view of the main part showing a punched ball for forming the back groove of the curved tile, and FIG. 9 is a perspective view of the main part of a conventional punched ball for forming the back groove of the same curved tile. It is a diagram. Fig. 10 is a perspective view showing an example of a flat tile with back grooves, Fig. 11 is an explanatory view for explaining a problem when extruding the same flat tile using a conventional cutting die, and Fig. 12 is a perspective view showing an example of a flat tile with back grooves. It is a principal part top view of the conventional cutting die. 14...Dice, 18...Cutting die, 26,50...
...Support rod, 28, 52...Molding part, 30, 55...
...Outer frame.

Claims (1)

[Claims for Utility Model Registration] A utility model installed inside the tip of an extrusion molding machine, which is used to continuously extrude the kneaded base material from a die at the tip of the extrusion machine to form two tiles together. A cutting die for forming each back groove of a tile, comprising a support rod extending in the extrusion direction of the base material, and a forming part provided at the tip of the support rod, the forming part corresponding to the back groove. A cutting die for an extrusion molding machine, characterized in that it has a hollow frame shape having an outer frame shaped like this.