JPS59158212A - Manufacture of cement product - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing cement products by pressure & bottom forming.

[Semaru 1 technology] Cement products (1) For example, the manufacturing method of ridge tiles by compression molding is as shown in Fig. 1. As shown in Figure 1, cement molding material (2) is poured into the top of the lower mold (3), and Figure (a))
Then, the frame (4) is lowered (Figure (B)), and then the upper mold (6) is pushed in to spread the cement molding material (2) and perform compression molding (Figure (C)). 4) and the upper mold (6) to remove the mold ((d) in the same figure),
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 mold (4) to receive the cement product fil on the receiving plate (6). (same figure (e)
)) However, in the past, the water generated during compression molding was removed from the lower mold (3) as shown in Figure 2.
Because drainage holes (8) were made uniformly throughout the entire surface of the lower mold (3), dewatering was completed near the center top of the lower mold (3) into which the cement forming material (2) was charged. ) Cement product (1) 9 Both sides corresponding to the terminal part (1a) (
3aX3a), the molding becomes so-called sluggish, the density of the cement product becomes non-uniform, and quality such as strength varies, resulting in low productivity. In particular, when manufacturing cement products with long lengths 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. is clearly visible.

[Disclosure of the invention]

The manufacturing method of the present invention is a method of 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. It is characterized by draining water through drainage holes provided at the bottom of the lower mold, which corresponds to the terminal end of the expanded cement product. The present invention will be described in detail below based on the attached drawings. This example relates to the manufacture of long bricks as a cement product (1), in which cement, water, river sand, slag material such as crushed stone, and synthetic fibers, asbestos, etc. are mixed together. The cement molding material (2) is poured into the center of the lower mold (3) covered with the cloth (9) (see FIG. 1(a)). Next, the frame (4) is lowered and then the upper mold (6) is lowered (see FIG. 1(b)). After that, as shown in Fig. 3, the upper mold (6
) and pressurize and compression mold the cemeshite molding material (2) (molding pressure 40-7 oKg/crj). In this case, the lower mold (3) is on both sides of the lower mold (3) corresponding to the terminal end (1a) of the cement product i11, that is, the nearly vertical sagging part, as shown in FIGS. 4 to 6! (3aX3a
) are provided with drainage holes (8) at regular intervals in the longitudinal direction, so that the cement molding material (2) pressurized by the upper mold (5) retains water. However, the water that is generated by being pushed and spread by the lower mold (3) will eventually flow through the drain hole (8).
) will cause dehydration. In this way, the cement molding material (2) is pressed and spread into the lower mold (3) while retaining water, and the lower mold (3)- corresponding to the terminal end of the cement product t1+ is spread.
Since it is dehydrated on both sides U (S (3a) (3a), the cement molding material (2) can be uniformly spread without impairing its fluidity. After this, it is hardened and aged, and then demolded to produce a cement product. +11 is manufactured (Fig. 1 (
d) See (e)) 0 [Effects 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 the end of the cement product is compressed and expanded into the lower mold. Since the water is removed from the drain holes provided on both sides of the lower mold corresponding to the part, 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. Productivity can be significantly improved as there is no variation in strength etc. due to VC, and a good AVc can also be used for long VC and multi-L shaped cemetite products. .

[Brief explanation of drawings]

Figures 1 (a) (b) (c) (d) (e) are sword 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; FIG. 3 is a cross-sectional view showing an example of the mold employed in the present invention, and FIGS. 4, 5, and 6 are a plan view, a side view, and a side view (cross-sectional view) of the same lower mold. ... Cement product, (2) ... Cement] Molding material, (3) ... Lower mold, (5) ... Upper mold, (8)
・Drainage hole. Agent Patent Attorney Ishi 1) Chief 7th Prisoner 5 Figure 8 30 8 Figure 6

Claims (1)

[Claims] ill In the method of manufacturing cement products in which cement molding material is put into a lower mold and then pressed into an upper mold for compression molding, the upper mold presses and spreads the cement molding material into the lower mold while retaining water, and the end of the cement product is formed. A method for manufacturing a cement product, characterized in that water is removed through drainage holes provided on both sides of a lower die corresponding to the section.