JPS6260963B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing cement products by compression molding.

[Background technology]

A method of manufacturing cement products 1, for example, by compression molding a ridge tile, is as shown in Fig. 1, in which a cement molding material 2 is poured into the top of a lower die 3 of a mold (a),
Next, the frame 4 is lowered (b in the same figure), and then the upper mold 5 is lowered.
is pushed in to spread the cement molding material 2 and compression mold it (c in the same figure). After this, the frame 4 and the upper mold 5 are raised and removed from the mold (d in the same figure), and finally, the lower mold 3 is moved and A demolding table 7 with a receiving plate 6 on the top is placed below the upper die 4, and the cement product 1 is received on the receiving plate 6 (e in the same figure). As shown in Fig. 2, the water generated during molding was dehydrated by providing drainage holes 8 uniformly throughout the lower mold 3 of the mold, so that the water generated during molding was drained from the center of the lower mold 3 into which the cement molding material 2 was charged. As dehydration is completed near the top of the cement product 1 of the lower mold 3, the molding at both sides 3a and 3b corresponding to the end 1a of the cement product 1 becomes so-called weak, and the density of the cement product becomes uneven, resulting in poor quality such as strength. Productivity was low due to variations. In particular, when manufacturing cement products with long and complicated shapes, the variation in quality was so large that it could not be used.

[Purpose of the invention]

An object of the present invention is to provide a method for producing cement products that can produce cement products with no variation in quality, significantly improves product quality, and can be particularly suitably applied to the production of long and complex-shaped cement products. With the goal.

[Disclosure of the invention]

The manufacturing method of the present invention is a method for manufacturing cement products in which cement molding material is put into a lower mold, and then an upper mold is pushed in to compression mold the cement product. , is characterized in that water is drained through drain holes provided on both sides of the lower mold corresponding to the terminal end of the cement product. The present invention will be described in detail below based on the accompanying drawings. This example relates to the manufacture of a long ridge tile as a cement product 1, and a cement molding material 2 which is a mixture of cement, water, aggregates such as river sand and crushed stone, and fibrous materials such as synthetic fibers and asbestos. is poured into the center top of the lower die 3 of the mold whose entire surface is covered with the filter cloth 9 (see FIG. 1a). Next, the frame 4 is lowered, and then the upper mold 5 is lowered (see FIG. 1b). Thereafter, as shown in FIG. 3, the upper die 5 is pressed using a hydraulic press (not shown) to pressurize and compression mold the cement molding material 2 (molding pressure 40 to 70 kg/cm ² ). In this case, the lower mold 3 is attached longitudinally to the upper and lower sides of the terminal end 1a of the cement product 1, that is, to the upper and lower sides of both side parts 3a and 3a of the lower mold 3, which correspond to the near-vertical sagging part, as shown in FIGS. 4 to 6. Since drainage holes 8 are provided at regular intervals along the upper mold 5, the cement molding material 2 pressurized by the upper mold 5 is expanded by the lower mold 3 while retaining water, and the generated water is eventually drained away. The water will be dehydrated through the drain hole 8. In this way, the cement molding material 2 is pressed into the lower mold 3 while retaining water, and the cement product 1 is spread.
Since the water is dehydrated at both sides 3a, 3a of the lower mold 3 corresponding to the terminal ends of the cement molding material 2, it is possible to uniformly spread the cement molding material 2 without impairing its fluidity. After this, the cement product 1 is produced by heat-forming the cement and removing it from the mold (see FIGS. 1d and 1e).

〔Effect of the invention〕

According to the method for manufacturing a cement product of the present invention, the cement molding material is compressed by the upper mold and spread into the lower mold while retaining water, and water drains are provided on both sides of the lower mold corresponding to the end of the cement product. Since the water is dehydrated through the holes, the cement molding material can be evenly spread until the final stage of compression molding, and the density of the resulting cement product can be made uniform, so there is no variation in quality such as strength, and production is possible. This method can significantly improve the properties of cement products, and can be suitably used especially for long and complicatedly shaped cement products.

[Brief explanation of the drawing]

Figures 1 a, b, c, d, and e are explanatory diagrams showing the manufacturing process of cement products, Figure 2 is a sectional view showing an example of a mold used in the conventional example, and Figure 3 is used in the present invention. A cross-sectional view showing an example of a mold,
FIG. 4, FIG. 5, and FIG. 6 are a plan view, a side view, and a cross-sectional view showing the same lower die. 1...Cement product, 2...Cement molding material, 3...Lower mold, 5...Upper mold, 8...Drain hole.

Claims (1)

[Claims] 1. In a method of manufacturing cement products in which cement molding material is put into a lower mold and then compressed by pressing an upper mold, the cement molding material is forced into the lower mold while retaining water with the upper mold, and the end portion of the cement product is A method for producing a cement product, characterized by dewatering through drain holes provided on both sides of a lower die corresponding to the above.