JPH0790528B2 - Mold for forming hydraulically patterned inorganic molded products - Google Patents

Description

TECHNICAL FIELD The present invention relates to a molding die for a hydraulic inorganic molded article having a pattern on the surface of the molded article.

(Prior Art) Conventionally, a molded product is formed by using a hydraulic inorganic molding material that is mainly composed of cement, gypsum, calcium silicate, etc., and if necessary, reinforcing fibers, pigments, etc. are added thereto. It is well known that a dehydrating press molding is performed by placing a molding material between molding dies including at least two dies.
By the way, it is also known that the surface of the molded product is patterned at the same time as the dehydration press molding. For example, Japanese Utility Model Publication No. 56-42014 has a pattern having an upper mold and a lower mold, the upper mold including a mold mounting plate B and a patterned mold C attached to the lower surface. The mold is listed.

(Problems to be Solved by the Invention) However, in the case of the above-mentioned conventional technology, the manufacturing cost of the patterned die is expensive, and the die replacement work is time-consuming, and the high-mix low-volume production that requires frequent die exchanges. Not suitable for.
Also, when the draft of the mold is vertical or close to that, the pattern part becomes an undercut, and the mold for molding the molded product is divided into three or more divided molds or a mold corresponding to the undercut part. It is necessary to make the side surfaces movable so as not to damage the molded product when the mold is opened, and there is a problem that the structure becomes complicated and the equipment cost also increases.

(Means for Solving the Problem) The present invention has been made to solve the problems of the above-mentioned conventional techniques, and includes: 1. One mold and the other, in which a large number of drain holes are provided on the mold surface. Of the press-molding die having the mold of (1), a water-permeable decorative sheet (or filter cloth) and a filter cloth (or water-permeable decorative sheet) are arranged in this order on the other mold surface, A hydraulic pattern with a pattern characterized in that a hydraulic inorganic molding material is placed between the mold and the filter cloth (the other is a sheet for water-permeable decoration), and it can be dehydrated by suction from the other mold. A mold for molding an inorganic molded article, and 2. a mold made of an extensible material in a mold cavity of a press mold having one mold and the other mold having a large number of water drain holes formed on the mold surface. The cloth and the water-permeable decorative sheet are arranged so as to substantially overlap with each other, and a hydraulic material is provided between the one mold and the filter cloth or the water-permeable decorative sheet. A hydraulic property with a pattern characterized in that an inorganic molding material is press-fitted, the filter cloth and the decorating sheet are stretched to extend along the other mold, and suction is made from the other mold to enable dehydration. The gist is a mold for molding an inorganic molded article.

As a press mold used in the present invention, for example, as shown in FIG. 1, there is an upper mold 1 which is one mold and a lower mold 2 which is the other mold. Is movable up and down with respect to the fixed lower mold 2.

The water-permeable decorative sheet used in the present invention has stretchability equivalent to that of the filter cloth described later and has a pattern to which a desired decorative pattern can be added. It is convenient to use a relatively large knitted fabric, woven fabric or other fiber product, and it is convenient when a ready-made fabric such as a lace fabric matches the intended pattern, but when it is a ready-made product and it is not in time, a special product For example, a rubber water-permeable decorative sheet manufactured by using gypsum as a mold material may be used.

Examples of the filter cloth used in 1 of the present invention include woven and non-woven fabrics such as synthetic fibers, semi-synthetic fibers, and animal and vegetable fibers.

The filter cloth made of an extensible material and the sheet for water-permeable decoration referred to in 2 of the present invention are materials whose dimensions and area are expanded when an external force is applied, for example, crimped yarn. The present invention refers to a cloth, a porous rubber or the like, which is different from the filter cloth or the water-permeable decorative sheet referred to in 1 of the present invention when the molding material is placed in the cavity. It is necessary to press-fit it inside, especially when the engraving of the desired pattern is deep or when the shape is complicated etc., it is adopted to utilize the extensibility of the material to ensure that the extensibility material is on the mold surface. This is used when it is necessary to allow the molding material to reach all the insides of the cavities at the same time as it is moved along.

In the molding die of the present invention, in order to automatically convey the shaped object to the intended place after press-molding and demolding, one of the molds is provided with a suction device and is adsorbed to this, and the state It is also optional to provide a mechanism for moving the shaped object together with the one mold to a desired place.

As the material for molding the hydraulic inorganic molded article in the present invention, cement, gypsum, a material mainly composed of an inorganic material that cures by a hydration reaction such as calcium silicate-forming material, mineral fiber, if necessary Fibers, inorganic fibers such as carbon fibers, organic fibers such as animal and vegetable fibers, synthetic fibers, and semi-synthetic fibers, sand, gravel, shirasu, etc. as aggregates, and other rapid hardening agents, pigments and the like may be mixed. And, as a matter of course, water is added in excess of the amount necessary for the hydration reaction to give fluidity to these mixtures, to obtain a molding material for a hydraulic inorganic molding.

(Operation) According to the first aspect of the present invention, a press-molding die having one die and the other die having a large number of drainage holes provided on the die surface, a water-permeable decoration on the other die surface. Sheet (or filter cloth) and filter cloth (or water permeable decoration sheet) are arranged in this order, and a hydraulic inorganic material is provided between the one mold and the filter cloth (or water permeable decoration sheet). Since it is possible to put the molding material and suck it from the other mold to dehydrate it, the water-permeable decorative sheet acts as a mold for decoration, and mold replacement work is easy. . Further, even if there is some undercut portion at the time of releasing the mold, the mold is released without damaging the object.

According to the second aspect of the present invention, a filter cloth made of an extensible material and a water-permeable material are provided in a die cavity of a press-forming die having one die and the other die having a large number of water drain holes on the die surface. The decorating sheet is disposed so as to substantially overlap with each other, a hydraulic inorganic molding material is press-fitted between the one mold and the filter cloth or the water-permeable decorating sheet, and the filter cloth and the decorating sheet are Is made to extend along the other mold and can be sucked from the other mold to be dehydrated. Therefore, in addition to the action of the first aspect of the present invention, reliable filling of the molding material into the cavity is achieved. When releasing the shaped article, the restoring force between the filter cloth made of the stretchable material and the water-permeable decorative sheet can be used.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 show an example in which 2 of the present invention is adopted as a forming die for forming a circular brick having a pattern on the surface, and 1 is one type. The male die 2 is a female die which is the other die, and is movable up and down with respect to the female die 2 to which the male die 1 is fixed by a press mechanism (not shown). Reference numeral 3 is a water draining hole provided in the mold surface 4 of the female mold 2 at substantially equal intervals, 5 is a water-permeable decorative sheet made of an extensible material, and 6 is a filter cloth arranged on the upper side thereof.

In the case of the present embodiment, the filter cloth 6 is arranged on the upper side of the water-permeable decorating sheet 5 because the water-permeable decorating sheet 5 is clogged with the fine particles of cement in the hydraulic inorganic molding material 7. This is to prevent this. However, when the water-permeable decorative sheet 5 is intended, the filter cloth 6 may be arranged below the water-permeable decorative sheet 5.

8 is a suction machine, 9 is an exhaust / drain pipe, and 10 is an exhaust / drain chamber.

Reference numeral 11 denotes a supply pipe for the hydraulic inorganic molding material 7, which allows the hydraulic inorganic molding material 7 to be press-fitted into the mold cavity using a supply pump from a tank (not shown).

Next, the operation of the above apparatus will be described. First, the hydraulic inorganic molding material is injected into the tank. Next, in the mold open state before reaching the state shown in FIG. 1, the water-permeable decorating sheet 5 and the filter cloth 6 are overlapped with each other, and the opposite edges thereof are formed on both edges of the female die 2. It is fixed to the bottom of the groove 12 provided by a retainer 13. When preparation for such pre-molding stage is completed, the press mechanism is driven to lower the male mold 1 to form a mold cavity,
Subsequently, the supply pump is driven to press-fit the hydraulic inorganic molding material from the supply pipe 11 into the mold cavity. At this time, the molding material is filled between the mold surface of the male mold 1 and the filter cloth 6 and flows to every corner of the mold cavity while pushing the water-permeable decorating sheet 5 and the filter cloth 6 apart. The state becomes as shown in FIG.

Before and after the molding material is filled in the mold cavity, suction is made from below the female mold 2 to dehydrate the hydraulic inorganic molding material 7 through the water-permeable decorating sheet 5 and the filter cloth 6. The hydraulic inorganic molding material 7 is sucked into the female mold 2 and comes into close contact therewith, and at the same time, the uneven pattern of the water-permeable decorating sheet 5 is embossed on the surfaces of the female mold 2 and the mold surface 4 through the filter cloth 6.

Thus, the hydraulic inorganic molding material 7 loses fluidity due to dehydration, and becomes a shaped article in which water for the hydraulic reaction is retained.

Further, the mold 1 is opened while continuing the suction of the female mold 2 to bring the shaped object into close contact with the female mold 2. The shaped object is in close contact with the female die 2 and the male die 1
And the shaped object is released. Next, the suction of the female mold 2 is stopped. Subsequently, a take-out jig having an external shape almost the same as that of the male die was closed with the female die, and the shaped object was brought into close contact with the take-out jig by sucking it from a suction hole provided in the take-out jig. The jig is pulled up and the shaped object is released from the surfaces of the female die 2 and the filter cloth 6. The water-permeable decorative sheet 5 and the filter cloth 6 are restored from the stretched state due to their stretchability.

After that, the uncured shaped object is transferred from the take-out jig to a curing mold, cured by a known means, and a hydraulic inorganic molded product is obtained by a hydration reaction.

Experimental example. ． Adjustment of hydraulic inorganic molding materials.

Cement 100.0 parts by weight Asbestos 18.8 parts by weight Water 540.0 parts by weight The above components were stirred with a reciprocating mixer for about 10 minutes to prepare a molding material.

． Filter cloth A cloth woven from yarn made from a blend of spandex and nylon.

Elongation rate: 260% in the longitudinal direction and 216% in the lateral direction at a load of 2.25 kg Density: 108 c / in. Sheet for water-permeable decoration is a ready-made net made of the same thread as the filter cloth, the size of the mesh is usually 3 mm, when using each material of 5 mm or more when extended, of the present invention described in Examples A round brick was formed using the apparatus of No. 2. As a result, a shaped article having a desired decorative pattern on its surface was obtained.

(Effect) According to the first aspect of the present invention, a press-molding die having one die and the other die having a large number of drainage holes formed on the die surface, a water-permeable decoration on the other die surface. Sheet (or filter cloth) and filter cloth (or water permeable decoration sheet) are arranged in this order, and a hydraulic inorganic material is provided between the one mold and the filter cloth (or water permeable decoration sheet). Since it is possible to put the molding material and suck it from the other mold to dehydrate it, the water-permeable decorative sheet acts as a mold for decoration, and mold replacement work is easy. . Further, even if there is some undercut portion at the time of releasing the mold, the mold is released without damaging the object.
Therefore, a die with a pattern is not required, and the die replacement work is easy, so that the manufacturing cost is low and it is suitable for high-mix low-volume production.

Further, according to the present invention 2, a filter cloth made of an extensible material is provided in a die cavity of a press-forming die having one die and the other die having a large number of water drain holes on the die surface. The water-permeable decorative sheet is disposed so as to substantially overlap with it, and a hydraulic inorganic molding material is press-fitted between the one mold and the filter cloth or the water-permeable decorative sheet to form the filter cloth and the decorative sheet. In addition to the effect of the above-mentioned 1 of the present invention, it is possible to ensure that the molding material is put into the sulcus of the molding material because the sheet and the sheet are stretched so as to be along the other mold and sucked from the other mold. The resilience between the filter cloth made of an extensible material and the water-permeable decorating sheet can be utilized when filling and releasing the shaped article. Therefore, even if there is an undercut portion, a mold having a simple structure is sufficient, and the molded product will not be damaged during molding.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of the molding die of the present invention, and FIG. 2 is an enlarged cross-sectional view of the main part of the same. 1 ... One mold, 2 ... Other mold, 3 ... Drainage hole, 5
... water-permeable decorative sheet, 6 ... filter cloth, 7 ... hydraulic inorganic molding material.

Claims (2)

[Claims] 1. A water-permeable decorative sheet (or filter cloth) on the other mold surface of a press-molding mold having one mold and the other mold having a large number of water drain holes formed on the mold surface. ) And a filter cloth (or a sheet for water-permeable decoration) are arranged in this order, and a hydraulic inorganic molding material is placed between the one mold and the filter cloth (or a sheet for water-permeable decoration), and the other A mold for molding a hydraulic inorganic molded article having a pattern characterized by being able to be dehydrated by suction from the mold. 2. A filter cloth made of an extensible material and a water-permeable decoration for use in a die cavity of a press-forming die having one die and the other die having a large number of drain holes on the die surface. The sheets are arranged so as to substantially overlap with each other, and a hydraulic inorganic molding material is press-fitted between the one mold and the filter cloth or the water-permeable decorating sheet to extend the filter cloth and the decorating sheet. A mold for molding a hydraulic inorganic molded article having a pattern characterized in that it can be dehydrated by sucking from the other mold along with the other mold.