JPS6016887B2 - Molding device for molded bodies with corrugated cross section - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing a molded article such as a roof tile having a corrugated section.

Conventionally, Western-style molding and press molding methods have been used to mold objects with corrugated cross-sections, such as roof tiles (the cross-sectional shape is exemplified in Figure 6), using cement or other materials to which water has been added. However, since all of these methods are intermittent molding methods, they have the disadvantage of poor working efficiency.

In order to improve this, a so-called extrusion molding method is sometimes adopted in which the material is extruded through a molding die using a screw or the like, but in this case there is a limit of one shape and size that can be molded. That is, when a material is molded using this extrusion molding method, when the size of the molded object is large, especially when the inside is large, the pressure distribution in the cross section of the molded object becomes uneven, and large distortions often occur in the molded object. Further, shapes that can be molded are limited to those in which the cross section perpendicular to the extrusion direction is always constant, and shapes that have irregularities along the extrusion direction cannot be molded. This invention improves these drawbacks of the conventional molding method, enables efficient molding of molded bodies with corrugated sections, and allows molded bodies to be molded even if they have a relatively wide shape. The object is to provide a molding device that does not cause distortion.

This will be explained below. The apparatus for molding a molded article having a corrugated cross section according to the present invention includes a lower mold that is moved in a fixed direction with a molding material placed thereon, and a lower mold that has a corrugated longitudinal section and that rotates in the same direction as the moving direction of the lower mold. A forming roll for forming the material into a corrugated shape, and a plate body provided in front of the forming roll and having a corrugated lower end similar to the vertical cross section of the forming roll, where the portion corresponding to the convex part of the forming roll becomes a convex part. The part corresponding to the recessed part of the roll is a recessed part, and the lower end of the waveform is closer to the lower end of the forming roll in any part)
It is provided with a barrier plate that is high and characterized in that the difference in height between both lower end portions is smaller in the thicker part of the forming roll and larger in the thinner part of the forming roll.

To explain this based on an example, in FIG.
Move in the direction of arrow A.

A molding material 6, such as cement mixed with water, supplied by a material supply section 7 is placed on the lower mold, and this molding material 6 is molded into a corrugated surface by a molding roll 3. . The forming roll 3 has a vertical cross section that has a waveform that is exactly the same as the surface shape of the article to be formed, and is oriented in the same direction as the lower die (
(in the direction of arrow B in the figure). Reference numeral 4 designates a barrier plate provided in front of the forming roll 3 and having a wavy lower end 40 similar to the longitudinal section of the forming roll 3. A portion corresponding to the convex portion 31 is a convex portion 41, and a portion corresponding to the concave portion 32 of the forming roll is a concave portion 42.

In addition, the lower end of the waveform of this barrier plate 4 is higher than the lower end of the forming roll in any part, and the difference in height between the two lower ends is as shown in FIG. The forming roll 3 is installed so that it is small in the portion (the convex portion 31 in the longitudinal section) and large in the thin portion (the recessed portion 32 in the longitudinal section) of the forming roll 3. That is, in FIG. 4, t is larger than t2. In such a configuration, the molding material 6 on the lower mold 2 is preformed by the opening plate 4 at the inlet of the molding roll 3 into a surface shape similar to the longitudinal cross-sectional shape of the molding roll, and is subsequently molded by the molding roll. These molding operations are performed continuously and are extremely efficient. In this case, as is clear from FIG. 4, the height of the preformed surface protrusions is higher than the surface protrusions formed by the forming rolls 3. If such an open plate 4 is not provided,
A difference in density occurs between the portion formed by the convex portion 31 and the portion formed by the concave portion 32 of the forming roll 3, causing distortion in the obtained molded body. This is because the circumferential speed is different between the convex portions 31 and the concave portions 32 of the forming roll 3, resulting in a difference in the amount of molding material rolled into the forming roll 3, and the compressibility of the molded product due to the convex portions 31 and 32. This is thought to be due to the fact that the values are different. Even if the waveform at the lower end of the barrier plate 4 is made equal to the waveform in the longitudinal section of the forming roll 3, or even if the lower end of the open plate 4 is made flat, distortion will still occur in the molded product. That is, only when the waveform at the lower end of the barrier plate 4 is made as shown in FIG. 4 can the distribution of molding pressure be kept uniform.
A molded body with uniform density can be obtained. In addition, in order to achieve higher precision and a better finished surface of the surface of the molded product, a molding tool as shown in FIG. 5 immediately after the forming roll 3 as shown in FIG. A die 5 may be disposed to allow the molded body to pass through.

In this case, the finishing angle of the forming die 5, i.e. the angle for reducing the cross section of the formed body together with its progress, is 1
/1000 to 20/100 brightness is common. Regarding the lower mold, the molding material 6 is poured into the lower mold at the material supply section, so it can be considered a type of so-called casting method in which the molding material is poured into the mold, and the direction of material movement (arrow It is possible to form both a shape in which unevenness appears in a cross section perpendicular to the direction A) and a shape in which unevenness appears in a cross section along the direction of movement of the material. The front side formed by the forming roll can only be formed so that a constant shape always appears in the cross section perpendicular to the direction of movement, but the back side formed by the lower die has unevenness in any direction as described above. It can be said that it is far superior to conventional extrusion molding methods in that it can be molded in such a way that it appears. As explained above, the apparatus for molding a molded article with a corrugated cross section according to the present invention includes a lower mold that carries a molding material and moves in a fixed direction, and a vertical cross section that is corrugated and moves in the same direction as the lower mold. A forming roll that rotates to form a corrugated surface of the material on the lower mold, and a plate body provided in front of the forming roll and having a corrugated lower end similar to the longitudinal section of the forming roll, and a convex portion of the forming roll. The part corresponding to the concave part of the forming roll is a convex part, and the part corresponding to the concave part of the forming roll is a concave part, and the lower end of the waveform is higher than the lower end of the forming roll in any part, and It is equipped with a barrier plate in which the difference in height is smaller in the thicker part of the forming roll and larger in the thinner part of the forming roll, so even if the shape is relatively wide, there is no distortion, and the cross section has a corrugated shape. It has become possible to efficiently mold a molded object with parts.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the forming apparatus according to the present invention, Fig. 2 is a longitudinal sectional view of the forming roll, Fig. 3 is a front view of the opening plate, and Fig. 4 shows the positional relationship between the barrier plate and the forming roll. Explanatory diagram, 5th
The figure is an external view of the molding die, and FIG. 6 is a sectional view of the molded body. All figures represent examples. 1. ．．・Conveyor, 2
... lower mold, 3 ... forming roll, 4 ... check plate, 5 ...
... Molding die, 6... Molding material, 7... Material supply section. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A lower mold that carries a molding material and moves in a fixed direction, a forming roll that has a corrugated longitudinal section and rotates in the same direction as the moving direction of the lower mold and forms the surface of the material on the lower mold into a corrugated shape; It is a plate provided at the front and has a corrugated lower end similar to the longitudinal section of the forming roll, and the part corresponding to the convex part of the forming roll is a convex part, and the part corresponding to the concave part of the forming roll is a concave part. , the lower end of the waveform is slightly higher than the lower end of the forming roll in any part, and the difference in height between both lower ends is smaller in the thicker part of the forming roll and larger in the thinner part of the forming roll. A molding device for forming a molded body with a corrugated cross section, which is equipped with a separator plate.