JPS6016888B2 - Molding device for molded bodies with uneven cross sections - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding apparatus for molding a molded article having an uneven cross section, such as a roof tile.

Traditionally, hydraulic compositions such as cement have been molded using cast molding methods, in which a material mixed with water is injected into a predetermined mold and hardened, and press molding methods, in which the material is compression molded in a predetermined mold. However, all of these methods have the disadvantage of being inefficient because they are intermittent molding methods.

Furthermore, since a considerable amount of water is used, the alkali in the cement often dissolves and causes white spots on the surface of the resulting product, a so-called efflorescence phenomenon. In order to improve these drawbacks, a so-called extrusion molding method was developed in which the material is extruded from a molding die using a screw or the like, but this method produces a molded product that is uneven only in the cross section perpendicular to the extrusion direction. Moreover, in the case of a wide molded product, distortion is likely to occur due to pressure unevenness. Another continuous forming method is the so-called paper forming method, in which a slurry of molding material is laminated and dehydrated to form a plate.
In this case, the thickness that can be molded is small, and there is a problem that efflorescence phenomenon, which makes it difficult to form irregularities on the surface, is likely to occur. This invention improves these drawbacks of conventional molding methods, and enables efficient molding of 1-thick molded products that are distorted even in wide molded products with uneven cross-sections. It is an object of the present invention to provide an apparatus capable of molding a molded body having a shape in which unevenness also appears in the cross section along the direction of movement of the lower mold on one of the surfaces.

That is, the apparatus for molding a molded article having an uneven cross section according to the present invention has a molding surface corresponding to the lower surface shape of the molded article, and has a lower mold that is moved by a conveyor and a mold that is located above the lower mold. It consists of a forming roll with a processed surface shape corresponding to the top surface shape of the formed body in a cross section perpendicular to the direction of travel,
The forming roll is divided into equal parts in terms of its outer shape, and each divided part rotates independently of each other around the rotation axis of the forming roll.

To explain this based on an example, in FIG. 1, a plurality of lower molds 2 having a molding surface shape corresponding to the lower surface shape of the molded article are placed on a comper which moves in the direction of arrow A.

In this case, the bottom shape of the lower die may be uneven in the direction of movement. A molding material 5 is loaded onto the lower mold 2 before the molding roll 3, reaches the position of the molding roll 3, and is compression-molded by the molding roll 3 to form a molded product 6. The processed surface (outer circumferential surface) of the forming roll 3 has an uneven shape corresponding to the upper surface shape of the molded product, and each part of the processed surface is separated into parts having approximately the same outer diameter and is separated from each other independently. It is designed to be able to rotate around the rotation axis of the forming roll. In the case of FIG. 1, each part of the forming roll rotates in the direction of arrow B due to the movement of the forming material, and the forming material is compression-molded between it and the lower die. In the figure, 4 is a forming die that is installed as necessary to make the surface of the obtained molded product smoother, and this forming die has a forming surface corresponding to the upper surface shape of the molded product. Normal 1/1000~20/100M
Due to the temperature gradient, the exit side is narrower than the entrance. If this is provided immediately after the forming roll (preferably in contact with the forming roll), the surface of the molded product can be finished extremely smooth. Reference numeral 6 denotes the obtained molded product, which is later cut into a predetermined size (the length of the lower mold 2), subjected to post-processing such as curing, and then taken out from the lower mold.

Next, let us take as an example the case of forming a molded body having a cross section as shown in Fig. 2 and an appearance as shown in Fig. 3.The forming roll used in this case is as shown in Fig. 4. The appearance of the lower mold is as shown in FIG.

Further, FIG. 7 shows the external shape of a forming die used as necessary in this case. FIG. 4 is a front view of the forming roll, and as can be seen from the figure, the processed surface is divided by a plurality of cutting lines 31 into parts with equal outer diameters, apart from the golden-shaped parts 32 at both ends. There is. Flange-shaped parts 3 at both ends
2 is for preventing the molding material from escaping from the side surface during molding, and since the molding material is not compression molded in this part, its outer diameter is not taken into consideration in this case. The reason why the processing surface of the forming roll is divided in this way and each part can rotate independently of each other is that it gives a uniform circumferential speed to each part of the processing surface of the forming roll, which allows the forming material to be rolled into each part. This is to make the amount uniform and thereby obtain a molded product with uniform density. In other words, if forming rolls with such convex surfaces are rotated as one unit, the convex portions of the forming rolls have a larger outer diameter than the concave portions, so the circumferential speed is higher and a larger amount of molding material is applied to these portions than the concave portions. Therefore, in the cross section of the molded body shown in FIG. 2, part A will have a higher density than part B. Such variations in density in the molded product cause distortion in the product and should be avoided at all costs. These inconveniences can be overcome by dividing the processing surface of the forming roll into sections having approximately equal outer diameters, as described above, and allowing each divided section to rotate independently of each other. By doing this, the molding material on the lower mold passes under the molding roll at a constant speed, so each divided part rotates at the same circumferential speed due to this movement, resulting in a molded product with a more uniform density distribution. It is compression molded. The rotation of each part of the forming roll should be as smooth as possible using ball bearings, roller bearings, etc., and the gaps between the joints of each divided part should prevent molding material from entering the inside. Therefore, it is preferable to set it to 0.05 ribs or less. ``In addition, let's talk about the lower mold.'' As shown in FIG. 6, the lower mold 2 is composed of a mounting part 22 for fixing it to the conveyor and a molding part 21 that is detachably mounted on the mounting part 22. Even if the conveyor is relatively short and the number of lower molds that can be attached to it cannot be increased that much, only the molding section 21 can be replaced (remove the molding section 21 on which the molded objects are placed one by one, Post-processing such as curing of the molded bodies is performed at a separate location), and new empty molding parts 21 are successively attached to the mounting part 22 fixed to the conveyor before the molding rolls), thereby achieving efficient continuity. This is advantageous because it allows driving.

As described above, the molding method using this molding apparatus is extremely efficient because it is a continuous molding method, and because it does not use a large amount of unnecessary water, efflorescence is less likely to occur.

As explained above, the apparatus for molding a molded article with an uneven cross section according to the present invention has a molding surface corresponding to the shape of the lower surface of the molded article, and is positioned above the lower mold and the lower mold, which is moved by a conveyor. It consists of a forming roll with a processed surface shape corresponding to the top surface shape of the molded object in a cross section perpendicular to the direction of movement of the lower die, and the forming roll is divided into equal parts (at the outer diameter). Since each part rotates independently of each other around the rotation axis of the forming roll, it is possible to efficiently form a molded product that is less prone to distortion even if it is a wide molded product with an uneven cross section. It has become possible to mold a molded article having a shape in which irregularities also appear in the cross section along the direction of movement of the lower mold on either the front and back surfaces.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of this molding device, Figure 2 is a sectional view of the molded body, Figure 3 is an external view of the molded body, and Figure 4 is a front view of the forming roll (the lower die is shown in cross section). ), FIG. 5 is an external view of the lower mold, FIG. 6 is a sectional view of the lower mold, and FIG. 7 is an external view of the forming die. All figures represent examples. 1... conveyor, 2
... Lower mold, 3... Forming roll, 4... Forming machine, 5... Molding material, 6... Molded body. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] 1. A lower mold having a molding surface corresponding to the lower surface shape of the molded object and moved by a conveyor; It consists of a forming roll with a processed surface shape corresponding to the top surface shape, and the forming roll is divided into sections with approximately equal outer diameters, and each divided section is rotated independently of each other around the rotation axis of the forming roll. A molding device for forming a molded object with an uneven cross section by rotating the . 2. A forming die with a forming surface corresponding to the upper surface shape of the molded article is disposed immediately after the forming roll to further smoothen the upper surface of the molded article formed by the forming roll. An apparatus for forming a molded article having an uneven cross section according to claim 1.