JPH081634A - Mold for hydraulic inorganic material and molding method - Google Patents

Abstract

PURPOSE:To provide molds for a hydraulic inorganic material which can obtain a product having no pluck and no crack with excellent quality even in a thin large molded form having a reverse tapered shape and deeply engraved decora tion and a method for molding. CONSTITUTION:Molds for a hydraulic inorganic material to be molded by filling the material in a cavity formed of an upper mold 1 and a lower mold 2 comprise body molds 11, 21 made of material having rigidity at the molds 1, 2 and surface molds 12, 22 made at the surfaces of material having elasticity of a two-layer structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die and a molding method for filling and molding a hydraulic inorganic material.

[0002]

2. Description of the Related Art Conventionally, a molding die for a hydraulic inorganic material is used,
Since the so-called casting is simple in the manufacturing process and the equipment cost is low, there is known a method in which a rubber elastic body is used as a mold material and a hydraulic inorganic material is poured into the mold for molding. There is. For example, Japanese Patent Application No. 4-1518 discloses a method for casting a hardened cementitious material, which improves the dispersibility of synthetic fibers and gives a hardened cementitious material.
Filed in No. 50.

[0003]

However, in the former molding method, the molded product has a wall thickness of 20 to 20.
When the wall thickness is 30 mm, it is possible to remove the mold after molding without any problem, but when the wall thickness is 10 mm or less, the reverse taper shape or deeply engraved molding is applied. In the case of a product, there is a problem that a load is applied to the molded product at the time of demolding after molding and cracks occur.

[0004] In order to prevent the load from being applied to the molded product, the mold made of the elastic body is deformed and released from the mold.
It is necessary to make the elastic body soft or to make it extremely thin so that it can be deformed manually, but this method makes it difficult to maintain the shape of the cavity and the resulting molded product lacks dimensional stability. Is left.

The present invention has been made by paying attention to the above-mentioned problems, and an object thereof is to solve these problems and form an inversely tapered shape or deep carving. Even a thin, large-sized molded product with decoration,
Provided is a molding die for a hydraulic inorganic material and a molding method capable of obtaining a product excellent in quality without peeling or cracking. Further, the main body die and the surface die are not separated, and the dimensional stability is excellent. The present invention provides a mold for hydraulic inorganic material, which can obtain the above product.

[0006]

In the hydraulic mold for a hydraulic inorganic material according to the present invention as set forth in claim 1, the hydraulic mold is formed by filling a cavity formed by an upper mold and a lower mold with a hydraulic inorganic material. A materialless molding die having a two-layer structure in which an upper die and a lower die have a main body die made of a rigid material and a surface die of the main body die made of an elastic material. Is characterized by.

In the hydraulic inorganic material molding die of the present invention as defined in claim 2, the main body mold and the surface mold of the hydraulic inorganic material molding die according to claim 1 are detachably fixed. It is characterized by being

In the molding method of the present invention according to claim 3, the molding die for hydraulic inorganic material of the present invention according to claim 1 or 2 is used, and water is applied to the cavity surface of the opened lower die. Along with thinly stretching the hard inorganic material, removing the bubbles contained in the hydraulic inorganic material to perform defoaming molding, and supplying the hydraulic inorganic material into the lower mold, vibrating the lower mold to move the upper mold. It is characterized by a second step of closing and shaping, a third step of clamping and curing and curing with a clamp, and a fourth step of opening and peeling off the molded product adhered to the surface mold and releasing it. And

The elastic body used in the mold for hydraulic inorganic material according to the first aspect of the present invention is preferably synthetic rubber or the like, and has a Young's modulus of 1.5 to 5.0 × 10 ⁻⁴ N /. m ² ,
The thickness is preferably 10 to 50 mm. Further, rigid metal, plastic, glass, cement, gypsum and the like can be used as the material of the upper and lower mold bodies.

[0010]

In the present invention, the molding die for hydraulic inorganic material according to claim 1 is used, and the hydraulic inorganic material is thinly stretched on the cavity surface of the lower mold opened in the first step, and at the same time, the hydraulic inorganic material is used. Defoaming is performed by removing the bubbles contained in, the hydraulic inorganic material is supplied into the lower mold in the second step, the upper mold is closed while the lower mold is vibrated, and the mold is clamped in the third step. The mold is clamped, cured and cured, and in the fourth step, the molded product that is in close contact with the surface mold is peeled off and released, resulting in a small bending strength of 40 kg / cm ² and a reverse taper shape. Even if the molded product has a large thickness and is deeply carved, it is possible to obtain a product with excellent quality without peeling or cracking.

Further, by using the molding die for hydraulic inorganic material according to the second aspect of the present invention and molding in the same manner as described above, since the main body mold and the surface mold are fixed, vibration and gravity The upper mold body and the surface mold do not separate from each other due to the influence, and a product having excellent dimensional stability can be obtained.

That is, in the conventional case, the rubber hardness is 50 to 70.
Despite using an elastic rubber with a considerably high hardness as a mold material, when a large rubber upper mold having an area of 30 cm ² or more is bent, the central part of the rubber mold is bent by gravity during molding, It is possible to solve the problem that the surface mold is partly separated and a product having the shape and size as the molding mold cannot be obtained.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an example of a molding die for hydraulic inorganic material according to the first aspect of the present invention. In FIG. 1, 1 is an upper mold and 2 is a lower mold. The main body mold 11 and the main body mold 21 that form the upper mold 1 and the lower mold 2 are made of rigid heat-resistant FRP (6 mm thickness), and the surface of the main mold 11 and the main mold 21 is Is composed of a surface mold 12 made of elastic silicon rubber (thickness of 30 mm) and a surface mold 22 attached to two layers.

Reference numerals 3 and 4 denote reinforcing members for reinforcing the main body 11 and the main body 21 of the upper mold 1 and the lower mold 2, respectively, which prevent deformation of the upper mold 1 and the lower mold 2 and have high dimensional accuracy. It is provided to mold a molded product.

FIG. 2 is a cross-sectional view showing an example of the molding die for hydraulic inorganic material according to the second aspect of the present invention. In FIG. 2, 10 is an upper mold and 20 is a lower mold. This upper mold 1
0 and the main body mold 101 that constitutes the lower mold 20, and the main body mold 20.
Reference numeral 1 is made of a rigid heat-resistant FRP (6 mm thick), and a main body mold 101 and a surface mold 102 made of elastic silicon rubber (30 mm thickness) on the surface of the main body mold 201, The surface mold 202 is fixed and is composed of two layers.

The surface mold 102 of the upper mold 10 and the lower mold 2
A cavity 301 is formed by the zero surface mold 202. Further, an overflow hole 401 is provided at the upper end of the cavity 301 for discharging the excess molding material after the molding material is filled in the cavity.

On both sides of the lower mold 20, support frames 204, 204 for supporting the lower mold 20 are erected.

Reference numerals 103 and 203 denote surface molds 10, respectively.
2 and a plurality of undercut ribs integrally provided on the back surface of the surface mold 202. The undercut rib 10
3 and 203 are fitted in fitting grooves 105 and 205 provided in the main body molds 101 and 201, respectively, and the surface mold 102 and the surface mold 202 are respectively in the main body mold 101,
And 201 are fixed.

The undercut ribs 103 and 20
Since 3 is made of elastic silicone rubber,
Since the fitting can be easily removed from the main body molds 101 and 201, the surface mold 102 and the surface mold 202 can be easily separated from each other.
It can be separated more easily than 01 and 201.

FIG. 3 shows the undercut rib 103,
And 203 is an enlarged sectional view. In FIG. 3, the undercut portion has a width L of 50 to 100 mm and a depth t of 5 to 2
0 mm, and the angle θ of the undercut is preferably 60 ° to 80 °.

FIG. 4 is a cross-sectional view showing another example of the molding die for hydraulic inorganic material according to the present invention. In FIG. 4, 30 is an upper mold and 40 is a lower mold. This upper mold 3
0 and the main body mold 301 that constitutes the lower mold 40, and the main body mold 40
1 is made of rigid heat-resistant FRP (6 mm thick), and the main body mold 301 and the surface mold 302 made of elastic silicone rubber (30 mm thickness) on the surface of the main body mold 401, The surface mold 402 is fixed and is composed of two layers.

The surface mold 302 of the upper mold 30 and the lower mold 4
The cavity 50 is formed by the zero surface mold 402. Further, at the upper end of the cavity 50, an overflow hole 60 is provided for discharging the excess molding material after the molding material is filled in the cavity.

On both sides of the lower mold 40, support frames 404, 404 for supporting the lower mold 40 are provided upright.

Reference numeral 70 denotes a fixing jig, and the fixing jig 70 having a round shaft shape is the cavity 50 of the surface mold 302 of the upper mold 30.
A plurality is provided so as to penetrate the main body mold 301 from the side.

5 and 6 are detailed views of the fixing jig 70. 5 and 6, a stopper 72 is provided at one end of the round shaft 71 of the fixing jig 70,
When it is inserted into the surface mold 302, it is fitted and fixed in the recess formed in the surface mold 302. Further, on the other end side, a groove 73 is symmetrically provided downward from the upper end, and a fixing ring 74 is inserted along the groove 73 and half-turned so that the protrusion 75 of the fixing ring 74 is formed into a round shaft. It is adapted to be hooked and fixed in an annular groove 76 provided in 71. That is, the fixing ring 74 is used outside the main body die 301 shown in FIG. 4, and the surface die 302 is fixed to the main body die 301 with one touch.

The total length of the fixing jig 70 is 50 to 100.
Although mm is preferable, it may be appropriately set depending on the size of the upper mold 30.

Therefore, by using the fixing jig 70 as described above, the main mold 301 and the surface mold 3 of the upper mold 30.
02 can be easily assembled, fixed, and separated.

The molding method of the present invention will be described below with reference to the drawings. FIG. 7 is an explanatory diagram of the first step. Figure 7
In the so-called defoaming molding, the surface layer 5 of the hydraulic inorganic material, which is a molding material, is thinly drawn on the cavity surface of the surface mold 22 of the opened lower mold 2 to remove bubbles contained in the surface layer 5. Is done.

FIG. 8 is an explanatory diagram of the second step. In FIG. 8, (a) shows a mode in which the hydraulic inorganic material 6 as a molding material is supplied to the lower mold 2, and (b) shows that the hydraulic inorganic material 6 is shaped by closing the upper mold 1. It shows an embodiment.

Reference numeral 7 denotes a molded body formed by closing the upper mold 1, and at this time, in order to improve the filling of the hydraulic inorganic material 6, the lower mold 2 is vibrated by a vibration generator (not shown). Is given and shaping is performed. 7a is a surplus material in which the hydraulic inorganic material 6 that has been supplied in a slightly excessive amount protrudes outside the mold as a surplus material after molding.

FIG. 9 is an explanatory diagram of the third step. In FIG. 9, reference numeral 8 is a clamp, and the clamp 8 clamps the upper mold 1 and the lower mold 2 to hold the molded state, and the molded body 7 is cured by curing.

FIG. 10 is an explanatory view of the fourth step. FIG.
At 0, when the upper mold 1 is opened, the molded product 71 that has been cured and cured in the third step is removed from the lower mold 2 together with the surface mold 22 of the lower mold 2. Since the surface mold 22 is easily deformed by the elasticity, the molded product 71 closely attached to the surface mold 22 can be released from the surface mold 22 without causing deformation or cracking.

Even when the molded product 71 has a reverse taper shape or a thin wall with a deeply engraved decoration, the surface die 22 is deformed by the elasticity as described above, resulting in peeling or cracking. The mold can be released without causing.

When transparent silicone rubber is used for the surface mold, there is an advantage that the work can be carried out while confirming the filling state of the hydraulic inorganic material, and the occurrence of filling failure can be prevented.

[0035]

In the present invention, the molding die for hydraulic inorganic material according to claim 1 is used, and the hydraulic inorganic material is thinly stretched on the cavity surface of the lower mold opened in the first step, and Remove the bubbles contained in the non-equipment and perform defoaming molding,
In the second step, the hydraulic inorganic material is supplied into the lower mold, the lower mold is vibrated and the upper mold is closed to form the mold, and in the third process the mold is clamped to cure and cure, and the fourth mold is opened. Molded product that has a small bending strength of 40 kg / cm ² and has a reverse taper shape and deeply engraved decoration by peeling off the molded product that is molded into close contact with the surface mold and released. Even in this case, a product with excellent quality, which is free from peeling and cracking, can be obtained.

Further, by using the molding die for hydraulic inorganic material according to the second aspect of the present invention and molding in the same manner as above, since the main body mold and the surface mold are fixed, vibration and gravity The upper mold body and the surface mold do not separate from each other due to the influence, and a product having excellent dimensional stability can be obtained. Therefore, it is suitable as a molding die for a hydraulic inorganic material and a molding method.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a molding die for hydraulic inorganic material according to the first aspect of the present invention.

FIG. 2 is a cross-sectional view showing an example of the molding die for hydraulic inorganic material of the present invention according to claim 2.

FIG. 3 is an enlarged sectional view of an undercut rib.

FIG. 4 is a cross-sectional view showing another example of the molding die for hydraulic inorganic material of the present invention according to claim 2.

FIG. 5 is a detailed view of a fixing jig 70.

FIG. 6 is a detailed view of a fixing jig 70.

FIG. 7 is an explanatory diagram of a first step.

FIG. 8 is an explanatory diagram of the second step, in which (a) shows a mode in which a hydraulic inorganic material as a molding material is supplied to the lower mold.
(B) shows a mode in which the upper mold is closed and a hydraulic inorganic material is applied.

FIG. 9 is an explanatory diagram of a third step.

FIG. 10 is an explanatory diagram of a fourth step.

[Explanation of symbols]

 1, 10, 30 Upper mold 2, 20, 40 Lower mold 11, 21, 101, 301, 401 Main body mold 12, 22, 102, 302, 402 Surface mold 3, 4 Reinforcing material 5 Surface layer 6 Hydraulic inorganic material 7 Molding Body 7a Excess material 8 Clamp 70 Fixing jig 71 Molded product 103, 203 Undercut rib 105, 205 Fitting groove 204, 404 Support frame 301, 50 Cavity 401, 60 Overflow hole

Claims (3)

[Claims] 1. A molding die for a hydraulic inorganic material, wherein a cavity formed by an upper die and a lower die is filled with a hydraulic inorganic material to be molded, wherein the upper die and the lower die are made of a rigid material. A mold for a hydraulic inorganic material, which has a two-layer structure composed of a mold and a surface mold of which the surface of the main mold is made of an elastic material. 2. The molding die for a hydraulic inorganic material according to claim 1, wherein the main body die and the surface die are detachably fixed. 3. A hydraulic inorganic material is stretched thinly on the cavity surface of an opened lower mold by using the hydraulic inorganic material molding die according to claim 1 or 2, and is included in the hydraulic inorganic material. The first step of removing bubbles to remove bubbles, and the second step of feeding the hydraulic inorganic material into the lower mold and closing the upper mold while vibrating the lower mold, and clamping with the clamp. A method for molding a hydraulic inorganic material, which comprises a third step of curing and curing, and a fourth step of opening the mold and peeling off the molded product adhered to the surface mold and releasing the molded product.