JPS5937202B2 - Method for manufacturing hydraulic inorganic molded products - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for producing a hydraulic inorganic molded product.

Conventionally, in order to manufacture a molded product with an undercut on one side using a molding material mainly composed of hydraulic inorganic materials such as cement, gypsum, and calcium silicate-forming materials, the mold must be a split mold or an undercut must be used. The side of the mold corresponding to the cut part was movable (it was strained once so that the hydraulic inorganic molded product would not be damaged when the mold was opened).

However, these conventional molds have a complicated structure and are expensive, and the furnace material is clogged when dehydrating the molding material, and it is not easy to replace the furnace material when it wears out.

Furthermore, it was extremely difficult to manufacture a furnace material that would fit along one uneven portion.

The present invention eliminates the drawbacks of the above conventional manufacturing method,
Manufacturing of hydraulic inorganic molded products with undercut parts with good surface condition at low cost using simple molds that do not require split molds or molds with moving mechanisms, and extensible furnace material that is easy to manufacture and replace. The purpose is to provide a method.

An example of the present invention will be described in detail with reference to the drawings.

The mold 1 consists of a male mold 2 and a female mold 3.

The mold 1 may be made of metal, or may be made of glass fiber-reinforced thermosetting synthetic resin.

A number of drainage holes 4 are provided on the mold surface of the female mold 3, and an undercut 1 on the raised mold side surface, which corresponds to the right side of FIG. It is prominent.

The water drain holes 4, 4 are connected to a suction device 61. male type 2
On the mold surface) suction holes 7, 7 are provided, and a molding material supply pipe 8 is opened.

The molding material supply pipe 8 pumps the molding material in the tank 9 to a pump 101.
Thus, the mold cavity 11 is press-fitted through the opening 12.

Further, the suction holes 7, 7 of the male mold 2 are connected to a suction device 13.

When the male mold 2 and the female mold 3 are closed, a mold cavity 11 corresponding to the shape of the desired molded product is formed, and a furnace material 14 made of a stretchable material is provided inside the mold cavity 11. ing.

An extensible material is a material that stretches by one dimension and expands its area when force is applied, and suitable examples include cloth using crimped yarn, porous rubber, and the like.

A frame 15 is inserted into the peripheral edge of the furnace material 14 and is placed outside the mold surface of the female mold 3.

The frame 15 prevents the furnace material 14 from shrinking and becoming unable to cover the mold surface of the female mold 3, and adjusts the shape by pulling the furnace material 14 from the periphery.

The furnace material 14 is made of a stretchable material, and when a fluid hydraulic inorganic molding material is supplied, it expands and comes into close contact with one mold surface, and when the molding material is removed, it straightens. The furnace material 14 is restored to its original shape.

If the furnace material is made of a material such as a wire mesh that does not have stretchability, it is unlikely that the furnace material will stretch or return to its original shape even if the furnace material is tightly attached to one mold surface. It's impossible.

The hydraulic inorganic material in the present invention is an inorganic material that hardens through a hydration reaction, such as cement, gypsum, and calcium silicate forming materials.

The hydraulic inorganic substance may include inorganic fibers such as mineral fibers and glass fibers, organic fibers such as animal and plant fibers, synthetic fibers, and semi-synthetic fibers, sand, gravel, etc. as aggregates, other quick hardening agents, pigments, etc. are mixed.

In order to impart fluidity to the mixture 1, a hydration reaction (excess water than the required amount is added) is made into a hydraulic inorganic molding material 16.

The hydraulic inorganic molding material 16 is mixed in the tank 9.

FIG. 1 After the mold 1 is closed as shown in FIG. .

As shown in FIG. 2, the hydraulic inorganic molding material 16 is filled between the mold surface of the male mold 2 and the furnace material 14, and flows to the corner of the mold cavity 11.

The furnace material 14 expands and comes into close contact with the mold surface of the female mold 3, so that it closely follows the undercut convex portion 5) of the female mold 3.

Undercut recesses 18 corresponding to the projections 5 were also formed in the hydraulic inorganic molding material 16 .

Before and after the hydraulic inorganic molding material 16 is completely filled into the mold cavity 11 of the mold 1, the suction valve 6 on the female mold 3 side is started, and suction is applied from below the female mold 3 to remove the hydraulic inorganic molding material 16 from the furnace. The water is dehydrated through the material 14.

The hydraulic inorganic molding material 16 is sucked into the female mold 31 and adheres more closely, does not lose fluidity due to dehydration 1, and retains moisture for the hydraulic reaction.The hydraulic inorganic molding material excipient 17
becomes.

After dehydration using the 6 suction machines ζ, stop the operation of the suction machine 6,
The suction machine 13 on the male mold 2 side is started.

The purpose of the suction device 13 is to bring the molding 17 of the hydraulic inorganic molding material into close contact with the male mold.

Then, the male mold 2 is gradually pulled upward to open the mold 1.

By stopping the suction device 6 on the female mold 3 side and starting the suction device 13 on the male mold 2, the excipient 17 is released from adhesion to the female mold 3 and loses its fluidity. do.

Ascending 1 of the male mold 2 At this time, the mold 17 is released from the close contact with the female mold 3, and the mold 21 is brought into close contact with the male mold 21 and moves together, and the mold 17 and the female mold 3 are moved together. The furnace material 14 made of a stretchable material between the mold surfaces forms a convex portion 5 that becomes an undercut of the female mold 3.
and the shrinkage of the furnace material 14] thereby covering the outer surface of the shaping body 17, and in particular the shrinkage of the undercut recess 1 of the body 17.
By protecting the recess 18 of the undercut of the excipient 17, the recess 18 of the undercut of the excipient 17 is prevented by friction with the protrusion 5 which becomes the undercut of the female mold 3. Prevent it from collapsing.

After the mold 1 is expanded, the P material 14 may be peeled off from the excipient 17 and remain on the upper end of the female mold 3, or the furnace material 14 may be strained with a highly adhesive material. The male mold 2t may also be attached together with the excipient 17.

Once the furnace material 14 is contracted from the expanded state, it can be easily peeled off by hand.

Thus, the furnace material 14 is left in the female mold 3, and the shaped material 17 is
may be molded many times, or may be pulled up together with the excipient 17 and the furnace material 14 may be cleaned after each molding.

Thereafter, the excipient 17 is cured by a conventional method, and a hydraulic inorganic molded article is obtained through a hydration reaction.

According to the manufacturing method E of the present invention, it is possible to stretch the furnace material without press-fitting the molding material into the mold cavity, and to make it conform to the mold surface of a complex shape. In this case, an undercut uneven portion can be formed corresponding to the uneven portion provided on the mold surface of the mold.

Then, the suction from the other mold having the undercut uneven portion is stopped, and the mold is opened while the hydraulic inorganic molding material is adhered to the one mold by suction from one mold. As a result, the outer surface of the molded material is protected when the furnace material recovers from the stretched state, and the molded material slides against the mold surface of the other mold, causing an undercut of the molded material of the hydraulic inorganic molding material. The uneven parts of the mold do not collapse due to friction with the mold surface of the other mold, and a hydraulic inorganic molding with a good surface condition can be produced.

<Example> In the mold 11 shown in FIGS. 1 to 4, a male mold 2,
The female mold 3 is made of glass fiber-reinforced unsaturated polyester resin, and the female mold 3 has a vertical mold surface.
A protrusion 5 was provided that protruded by about 10 mm from the mold surface.

[Between the male mold 2 and the female mold 3] With the metal wire frame 151 twisted and stretched, a sill material 14 made of cloth using synthetic fiber winding yarn was installed.

Inside the mold cavity 11, place Portland cement 1oo1. B part,
A mixed hydraulic inorganic molding material 16 consisting of 25 parts by weight of asbestos fiber and 500 parts by weight of water is pumped through a pump 101 into a male mold 2.
2kg/cr? The furnace material 14 was stretched and brought into close contact with one mold surface of the female mold 3.

The inside of the female mold 3 was suctioned to -500 mmH, 9 using a suction device 6, and the hydraulic inorganic molding material 16 was dehydrated to form a shaped article 17 thereof.

After stopping the suction of the suction device 6, use the suction device 13 to remove the male mold 2.
The mold 1 was gradually expanded while suctioning 1300 m1H, 9f inside.

The mold 17 was pulled up together with the male mold 2, and the furnace material 14 attached to the mold 17 was peeled off by hand, washed with water, and reused in the next step.

The suction of the suction device 13 was stopped, and the male mold 2 was gently dropped by a t-shirt.The excipient 17, which was placed on a suitable curing table, was cured for about two weeks in an atmosphere of room temperature steam and hardened by a hydration reaction. .

The obtained hydraulic inorganic molded product had a good surface condition, no chips or rough surfaces in the undercut recesses, a bending strength of 162 kg/ffl, and good mechanical strength. there were.

[Brief explanation of drawings]

1 to 4 are longitudinal sectional views showing an example of the steps of the method for producing a hydraulic inorganic molded article of the present invention. 1... Molding mold, 2... Male mold, 3...
...Female type, 4...Drain JL 5...
... Undercut 1 Convex part, 6 ... Suction device, 7 ... Suction hole, 8 ... Molding material supply pipe, 9 ... Tank , 10... pump, 11... mold cavity, 12... opening, 1
3... Suction machine, 14... Furnace material, 15.
... Frame, 16 ... Hydraulic inorganic molding material, 17 ... Shaped object, 18 ... Undercut recess.

Claims (1)

[Claims] 1 Inside the closed mold cavity formed by one mold and the other mold 1, which has a number of ice removal holes on the mold surface and an uneven part with undercuts on the raised mold side. A furnace material made of a stretchable material is provided, and between the one mold and the furnace material 1
This hydraulic inorganic molding material is press-fitted, the furnace material is stretched to lie along the other mold 1, and the material 1 is sucked from the other mold.
This is dehydrated and shaped, the suction from the other mold is stopped, and the mold is molded while suction is applied from one mold to adhere the excipient of the hydraulic inorganic molding material to the mold. A method for producing a hydraulic inorganic molded product characterized by opening.