JPH0790540B2 - Molding and cutting method for inorganic moldings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a method for molding and cutting an inorganic molded body used for, for example, a roof material, an outer wall material, an interior material, and the like.

<Prior Art> Conventionally, for example, an inorganic hardened material used for a roof material, an outer wall material, an interior material, etc. is a hydraulic inorganic composition mainly composed of cement, gypsum, etc., for example, a papermaking method, an extrusion molding method, a semi-dry method. Manufactured by molding by a molding method or the like, or by further pressure molding such as shaping, patterning, etc., and then dividing and cutting the raw plate into a predetermined shape and curing and curing. There is.

<Problems to be Solved by the Invention> However, in the conventional method for producing an inorganic cured body, the inorganic molded body before curing (hereinafter referred to as “molded body”).
In the case of forming and cutting, the following problems occur when the pattern is formed on the surface as shown in FIG. 6 and an attempt is made to obtain a molded body 61 having a slanted opening 60.

As shown in FIG. 3, when the forming die 20 having the protrusions 20a forming the wood mouth surface is used to form an uneven pattern on the surface of the raw plate 21 and at the same time the raw plate 21 is cut by the blade 22, Board 21
When there is not enough plasticity, the material does not move smoothly during molding and compression, and cracks 23
There was a problem that occurs.

Further, as shown in FIG. 4, when the forming die 25 is used to provide a sharp cutting projection 25a, when the tip of the projection 25a is chipped or the raw material contains fibrous material, There is a problem that cracks 23 occur on the bottom surface side of the raw plate 21 when it becomes impossible to cut or when it is pushed deeply.

Therefore, as shown in FIG. 5 (a), the surface of the raw plate 21 is once patterned by the patterning die 26, and then, FIG. 5 (b).
By using the die 27 for forming and cutting the mouth end surface shown in, the raw plate was divided and the mouth end surface having an oblique shape was formed.
There was a problem that the raw material was turned up to the curved surface portion 27b forming the protrusion 27a for forming the wood mouth surface, cracks 28 were formed, and cracks 23 were generated.

<Means for Solving the Problems> The constitution of the method for molding and cutting an inorganic molded body of the present invention for solving the above-mentioned problems is such that a kneaded product of a hydraulic inorganic composition is pressure molded using a molding die. In the method for molding / cutting an inorganic molded body, which is then cut, the surface of the molded body is patterned as necessary, and the above-mentioned kneading is carried out using a molding die having a protrusion that forms an obliquely shaped mouth end surface. It is characterized in that an article is pressure-molded, and then the molded body is cut with a cutter along the groove portion formed by the protruding portion of the molding die.

Hereinafter, the present invention will be described in detail.

Here, in the present invention, the term "inorganic molded article" generally means cement,
A method of paper making a hydraulic inorganic composition containing gypsum as a main raw material and appropriately mixed with various ceramic materials such as siliceous raw material, calcareous raw material, reinforcing material, aggregate, water reducing material, thickening material, etc. A material that is formed by extrusion molding, semi-dry molding, or the like, or a material that is kneaded is directly pressure-molded using a molding die, and then cured and cured, for example, roofing material, outer wall material,
It is used for interior materials.

The kneaded product in the present invention is obtained by mixing or kneading the above hydraulic inorganic composition with an appropriate amount of water according to the purpose, and is shaped by various molding methods. Say.

In the present invention, the molding die is a raw material or a kneaded product which is obtained by kneading a hydraulic inorganic composition containing cement, gypsum or the like as a main raw material, or after mixing and kneading, and which has a predetermined shape. Of the molding die 11 as shown in FIG. 1, for example, as shown in FIG. 1, is used for pressure molding with ceramic materials such as flat pressing and low pressing. It means that the inner surface 11a is provided with a concavo-convex pattern, the surface of the obtained molded body is patterned, and the molded body is molded into a predetermined shape. Incidentally, FIG. 1 is a perspective view of the molding die as seen from the back side, and it is used in reverse when used.

Further, the protruding portion provided on the molding die refers to one formed by projecting over the longitudinal direction of the molding die so as to give an oblique shape to the mouth end surface of the molding, and for example, As shown in FIG. 2, it refers to a protruding portion 12 formed so that the cross-sectional shape of a molding die 11 is tapered and protrudes, and refers to those provided around and protruding from the molding die. Then, when the pressure molding is performed, as shown in FIG.
The distance a from the tip 12a of the raw plate 13 to the bottom of the raw plate 13
It is preferable to press so that the ratio of the distance to the press thickness b is a / b: 1/1 to 1/5, because cracks, cracks, etc. do not occur at the time of pressing.

In the present invention, the groove portion means a groove portion 14a or a step portion 14b which is formed in the kneaded product when pressure-molded by the protruding portion of the molding die.
Refers to the part that is cut by the cutter.

In the present invention, the cutter is used to cut a molded body pressure-molded by the above-mentioned molding die. For example, as shown in FIG. 2 (d), the groove of the green plate 13 formed by the molding die 11 is formed. Section 14
a or a step 14b is cut using the blade 16 of the cutter 15 to form a molded body having a slanted mouth end surface 60 as shown in FIG.
Got 61.

In the present invention, the kneaded product is once pressure-molded by the molding die having the protrusions as described above, and then cut by the cutter along the groove formed in the kneaded product by the protrusions, which is different from the conventional method. There is no possibility that cracks or cracks will occur in the obtained molded product.

<Example> A preferred example of the present invention will be described below with reference to the drawings.

The following raw materials were used to obtain a kneaded product at the blending ratio shown in Table 1.

Raw materials-Cement: Ordinary Portland cement (manufactured by Onoda Cement Co., Ltd .; Blaine specific surface area 3300 cm ² / g) -Silica powder: Silica powder (manufactured by Chichibu Mining Co., Ltd .; specific surface area)
3800cm ² / g) ・ Wollastonite: (Product name: NYAD-G, produced in the US) ・ High-performance water reducing agent: (Product name: Mighty 150) (Kao Corporation's highly condensed naphthalene sulfonate) ・ Thickening Agent: (Brand name: Metroses 90SH-15000, manufactured by Shin-Etsu Chemical Co., Ltd.)-Fiber: PP polypropylene (Brand name: Taflight Teikoku Sangyo Co., Ltd.) Fiber length 6 m / m Molding method Dry mixing of a predetermined amount of powder and fiber with a mixer (about 3 minutes)
Then, add water and perform wet mixing (about 10 minutes). Then, using an extrusion molding machine, extrusion molding is performed with a width of 120 mm and a thickness of 30 mm. Next, using a roll press with a roll diameter of 40 cm, width 250 mm × thickness 9 mm
Roll to. And pressure is 10 with a flat press (100t press).
Press-mold at kg / cm ² to obtain a molded body with a thickness of 8 mm.

At this time, as shown in FIGS.
A raw plate 13 conveyed by using a molding die 11 having 12 is pressure-molded, and then cut by a cutter 15-shown in FIG. 2 (d),
As shown in FIG. 6, a stone-cut skin-like molded body 51 having a slanted cut-out surface 50 was obtained.

After molding, steam curing (24 hours at 60 ° C), then secondary curing at 20 ° C for 1 week, then 10
It was dried at 5 ° C. until it was dried to obtain an inorganic cured body.

The pressure molding method will be described in more detail.

(Pressure forming process) Raw plate rolled by a roll press to a width of 250 mm and a thickness of 9 mm
13 is conveyed to a predetermined press position of the molding die 11 of the flat press by the conveying means (see FIG. 2 (a)). The flat press molding die 11 of the present embodiment is provided with a stone pattern, and in order to make the shape of the grain mouth of the obtained molded body into an oblique press-cut shape, the projecting portion 12 is provided around the raw plate. The wood surface of 13 is formed into a diagonal push-cut shape.

Next, pressure molding is performed by the molding die 11, and after completion of the pressure, the green plate 13 is released (see FIGS. 2B and 2C).

In the present embodiment, the distance ratio between the distance a from the tip 12a of the protruding portion 12 forming the wood mouth surface to the bottom 13a of the green plate and the pressed thickness b of the green plate is a. / b = 1/4 (see FIG. 2 (b)).

Next, the cutter 15 was used to cut in all directions to obtain a molded body 61 shown in FIG.

In the obtained molded body 61, the stone pattern was clearly transferred to the surface. Further, the projections 12 are provided on the molding die 11 to form a pattern, and the shape is made into a diagonal press-cut shape of the wood mouth surface, and the result is good because it is cut by the cutter 15, cracks, cracks, etc. of the molded body. There were no abnormalities.

<Effects of the Invention> As described above in detail with reference to Examples, according to the present invention, it is possible to obtain a molded product which does not cause an abnormality such as a crack or a crack when the mouth end surface of the molded product has an oblique shape. It has the effect of being able to.

[Brief description of drawings]

FIG. 1 is a rear perspective view of a molding die, FIG. 2 is a process drawing of pressure molding cutting of a kneaded product, and FIGS. 3 to 5 are schematic views of pressure molding cutting of a kneading product according to a conventional technique. , FIG. 6 is a perspective view of the molded body. In the drawing, 11 is a molding die, 12 is a protruding portion, 13 is a green plate, 14 is a groove portion, 15 is a cutter, 16 is a blade, 60 is a mouth end surface, and 61 is a molded body.

Claims (1)

[Claims] 1. A method for molding / cutting an inorganic molded body, which comprises press-molding a kneaded product of a hydraulic inorganic composition using a molding die, and then cutting the molded product, wherein a pattern is formed on the surface of the molded body, if necessary. The kneaded product is pressure-molded by using a molding die having a protruding portion that forms an obliquely shaped mouth end surface, and is then molded along the groove formed by the protruding portion of the molding die. A method for forming and cutting an inorganic molded body, which comprises cutting the body using a cutter.