JPS584606B2 - Molding equipment for roof accessories - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding apparatus for roof accessories, and is used for molding roof accessories, particularly ridge accessories, by press molding of cement powder.

Cement tiles are well known as one of the Japanese tiles. To manufacture these tiles, a relatively hard mortar with a cement and sand ratio of 1:3 is placed on the template of a tile making machine. Mortar is poured into the template using rollers, excess mortar is scraped off, and the molded product thus formed is removed from the tile making machine along with the template, and is carried into a curing room where the molded product is cured.

However, in the tiles obtained in this way,
Mechanical strength, heat insulation, and cold resistance are insufficient.

It also has the disadvantage that cracks are likely to occur during drying or curing.

The cause of this cracking is thought to be that evaporation of water during drying or curing occurs only from the surface of the molded product, making it difficult to dry uniformly over the entire molded product.

In view of the current situation, the applicant has added 3 to 10% by volume to a cement mixture containing inorganic foamed aggregate and reinforcing fibers.
of water is added and this cement mixture is shaped into tiles for 20 minutes.
It was previously proposed to press mold at a pressure of 0 to 600 kg/cm2, supply water to the molded body by immersion in water or water sprinkling, and then cure the molded body by autoclaving.

In forming this tile, the added moisture is limited to 3 to 10%, so the fluidity of the cement is suppressed and impregnation of cement into the inorganic foam aggregate during pressing is prevented.

This is also due to the fact that the press pressure is limited to 600 kg/cm2 or less.

Furthermore, since the press pressure is set at 200 kg/cm2 or more, the strength immediately after molding is also quite high.

In the tile manufacturing method previously proposed by the present applicant, as mentioned above, the amount of water added to the raw materials is kept as small as possible, and the press forming pressure is kept as low as possible, so even after press forming, The pores of the inorganic foam aggregate are kept unfilled.

Therefore, the evaporation of water during drying or curing is also carried out from inside the molded body due to the porosity of the inorganic foamed aggregate, and the entire molded body is uniformly dried.

Therefore, the above-mentioned occurrence of cracks can be effectively prevented.

Since the tiles obtained by the above method contain the inorganic foam aggregate in a porous state, they have excellent heat insulation properties and are lightweight.

Furthermore, since it is a press-molded product and contains reinforcing fibers, it has excellent mechanical strength.

Furthermore, since it is a press-formed product and has a strong structure,
There is no cracking due to freezing or expansion of water-containing water, and it has excellent freezing and cold resistance.

In particular, if foamed silica sand with a strong shell is used as the foamed aggregate, there is no concern that the freezing and cold resistance will decrease due to the use of water-absorbing aggregate.

Figure 6 shows an outline of the equipment used to manufacture the roof tiles.
140 is the upper mold, 100 is the lower mold, 50, 50 is the lower mold 1
00, and these outer frames 50
, 50 are movably supported by cylinders 10', 10'.

To manufacture roof tiles using this apparatus, a raw material is supplied to a uniform thickness onto a lower mold 100, and this raw material is pressed by lowering the upper mold 140.

At the beginning of this press, the upper layer P' of the raw material is compressed into a hard layer, and a large reaction force f' is generated between this layer P' and the outer layers 50, 50, and due to this acting force, the upper layer P' of the raw material is compressed into a hard layer. A friction restraining force is generated between P' and the outer frame 50.

Therefore, the lowering of the upper mold 140 is transmitted to the outer frames 50, 50, the distance between the lower mold 100 and the above-mentioned layer P' is reduced, and the raw material is substantially pressurized from both sides (external frame 50
, 50 are fixed without cylinders 10, 10', both ends of the hard layer P' are the outer frame. When it is fixed by the above-mentioned friction restraint force, this hard layer fixed at both ends becomes like a hard plate beam with both ends fixed between the fixed outer frames, and the subsequent lowering of the upper mold 140 is prevented, so that the subsequent raw material pressurization is prevented).

The molded product press-formed in this way has a uniformly tough structure even inside because both sides are pressurized.

By the way, as shown in FIG. 7, the applicant of this application has attached a main body part A to one end of the main body part A1 having an arch-shaped cross section, as shown in FIG.
It has already been proposed to provide an insert A2 dimensioned to be received in the other end of 1.

This edifice has a more complicated shape than the above-mentioned roof tile, and in order to apply the press molding method of cement-based powder described above, it is necessary to improve the mold equipment.

In particular, there is a concern that the mechanical strength at this location may be weakened due to insufficient compression of the stepped portion, and it is important to resolve this issue.

Furthermore, in order to supply the raw material onto the lower mold to a uniform thickness, special measures are required because there is a difference in height on the molding surface of the lower mold.

The molding device for roof accessories according to the present invention has been devised in view of the above-mentioned points, and the inorganic powder is passed through a stepped surface to one end of the main body portion having an arch-shaped cross section, and is then formed into a reducing opening having an arch-shaped cross section. A device for press-forming into a roof accessory having a
The lower mold for molding the accessory is divided at a part of the main body molding part located a little away from the end of the insert molding part, and an upper and lower pedestal is provided for each, and the above-mentioned insert molding side divided piece is fixedly supported on the upper frame, the main body molding side divided piece is supported on the upper frame by a hydraulic cylinder, outer frames are provided in front and behind the lower mold, and a hopper guide is integrated into each of these outer frames. Each of the outer frames is connected to the lower surface of the lower pedestal by a hydraulic cylinder via an arm that can be inserted through the upper pedestal and the lower pedestal, and the hopper guide includes:
The structure is characterized in that a hopper with partition plates at the front and rear ends is slidably fitted into the hopper.

The present invention will be explained below with reference to the drawings.

In Fig. 1, 1 is a lower mold, and as shown in Fig. 3, a1 molds the outer surface of the main body part A1 of the accessory shown in Fig. 7.
and a surface a2 that forms the outer surface of the insertion portion A2 of the accessory, and a step surface b exists between these molding surfaces al and a2.

This lower mold 1 has a molding surface located at a distance l from the stepped surface b.
It is divided into mold pieces 11 and 12 at.

Of these split mold pieces 11 and 12, the slot molding side split piece 12 is fixedly supported on the upper pedestal 2, and the main body molding side split piece 11 is movable up and down on the upper pedestal 2 by a hydraulic cylinder 3. Supported.

As shown in FIG. 3, the range of elevation of the main body molding side divided piece 11 is from the lower limit level where the main body molding bottom surface a12 of the fixed divided piece 12 and the main body molding bottom surface a11 of the divided piece 11 coincide with each other. As shown in FIG. 1, this is between the upper limit level at which the molded bottom surface a2 of the insertion part of the fixed divided piece 12 and the molded bottom surface a11 of the main body part of the divided piece 11 match.

At this upper limit level, the upper end of the fixed divided piece 12 and the upper end of the movable divided piece 11 are flush with each other.

Outer frames 61 and 62 disposed at both ends of the lower mold 1 are hopper guides, and the outer frames and the hopper guides are integrated.

A flush hopper guide groove 1 is provided on the outer frame and the hopper guide, and the inner contour of this groove 7 is as follows.
As shown in FIG. 4, the inner contour of the insertion part molding surface a2 of the fixed divided piece 12 of the lower mold 1 is made smaller by the thickness t.

8 is a lower frame, and the above-mentioned outer frames 5, 5 are this frame 8.
The hydraulic cylinder 10 is suspended on the lower surface of the hydraulic cylinder 10 via an arm 9.

Reference numeral 13 denotes a raw material hopper, which has both shoulders 131, 131 as shown in FIG. (see figure).

An opening 132 is located between the shoulders 131 and 131 of this hopper 13.
has been done.

Both end partition plates 133, 133 are slidably in contact with the groove surface 7 of the guide 61.

In Fig. 5, 1 34 and 1 34 are hopper 1
135 is an intermediate hopper provided between the hoppers 134, 134 on both sides.

In FIG. 1, 14 is an upper mold, which has a surface b2 for molding the inner surface of the insertion part A2 of the accessory, and a main body A of the accessory.
1, and both molding surfaces b
1 and b2 is a tapered step surface b3, and this upper mold 14 is connected to a ram 15 of a press.

The operation of molding the accessory shown in FIG. 1 by compressing cement powder using the apparatus of the present invention is as follows.

In the initial stage, as shown in FIG. 1, the movable segment 11 of the lower mold 1 is positioned at the upper limit level by the hydraulic cylinder 3.

At this stage, the insertion portion molding surface a2 of the lower mold fixed divided piece 12 and the main body molding surface all of the lower mold movable divided piece 11 are flush with each other.

Further, the upper end surfaces on both sides of the lower mold pieces 11 and 12, and the upper end surfaces on both sides of the outer frames 5, 5 and guides 61, 6S are all flush with each other.

Therefore, the hopper 13 is in a state where it can be smoothly reciprocated once between the front guide 61 and the rear guide 62.

This reciprocating movement of the hopper 13 is performed by a hydraulic cylinder (not shown).

First, in the above-mentioned initial stage, cement powder is supplied to the hopper 13, and the hopper 13 is moved back and forth once by a hydraulic cylinder (not shown).

By one reciprocating movement of the hopper 13, the raw material powder is distributed in a thickness onto the inner surface of the lower mold, as shown in FIG.

Further, the recess m between the split mold pieces 11 and 12 is filled with raw material powder.

After that, the upper mold 14 is lowered by operating the press,
As shown in FIG. 3, the main body molding surface all of the movable split lower mold 11 and the main body molding surface a12 of the fixed split lower mold 12 are flush with each other.

At this stage, the descent of the movable split lower die 11 is stopped, and the raw material is compressed by the subsequent descent of the upper die 14.

This compression of the raw material hardens the upper layer P of the raw material, and a large reaction force f is generated between this hard upper layer P and the outer frames 5, 5, and due to this reaction force f, the hard upper layer P and the outer frames 5, 5 are frictionally restrained.

Therefore, the downward movement of the upper mold 14 is transmitted to the outer frames 5, 5,
The outer frames 5, 5 are lowered against the hydraulic pressure of the hydraulic cylinder 10.

This lowering of the outer frames 5, 5 causes the lower die 1 to rise relative to the outer frames 5, 5, and the raw material is effectively pressurized from the lower die 1 side as well.

In other words, by applying pressure on both sides, the raw material is compressed uniformly,
hardened.

After the raw material is uniformly compressed as described above, the upper mold 14 is raised, and the movable lower mold segment 11 is returned to the initial state shown in FIG. 1 by the hydraulic cylinder 3.

At the same time, the outer frames 5, 5 are also returned to their initial states by the hydraulic cylinder 10.

After returning to the initial state in this manner, the compression molded body is released from the mold and the above-described operation is repeated again.

In the accessory molded as described above, as shown in FIG. 2, a large amount of raw material is filled in the recess m between the two lower mold division pieces 11 and 12, and as shown in FIG. Due to the tapered surface b3 of the mold 14, it is compressed at a sufficient compression rate to form the accessory stepped portion.

Therefore, sufficient strength is imparted to the stepped portion of the accessory.

Usually, the width l of the recess m is set to be two to three times the thickness of the accessory molded.

In addition, since the hopper opening of the hopper is divided into both side hopper openings and an intermediate hopper opening, a sufficient amount of powder material can be supplied to both sides of the inner surface of the lower mold, and the material density on both sides is This can effectively prevent the material density from becoming smaller than the material density at the bottom of the lower mold.

Therefore, it is possible to achieve good homogenization of the entire accessory.

As described above, according to the apparatus for molding roof accessories according to the present invention, roof accessories having a complicated shape can be easily formed by dry compression molding of cement-based powder under conditions of double-sided pressurization. I can do it.

That is, as shown in FIG. 3, the upper layer P of the raw material is hardened by compression by the upper die 14, and this hard layer P and the outer frames 5, 5
After the upper mold 14 is lowered and the outer frames 5, 5 are lowered, the lower mold 1 is moved against the outer frames 5, 5. Since the material is relatively raised, the raw material can be compressed uniformly by applying pressure on both sides.

In addition, the compression ratio of the raw material in the stepped portion of the accessory can be increased, and the strength of the stepped portion can be improved.

Furthermore, by moving the hopper, the raw material can be supplied with a uniform thickness, and by linking this raw material supply with the operation of the press, the accessory can be molded at high speed.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the device of the present invention, FIGS. 2 and 3 are explanatory diagrams showing the operating state of the device of the present invention, FIG. 4 is a sectional view taken along Vl-VI in FIG. 1, and FIG. FIG. 6 is an explanatory diagram showing a hopper in the invention apparatus, FIG. 6 is an explanatory diagram showing a powder molding apparatus using an internal pressure method, and FIG. 7 is an explanatory diagram showing a hopper previously devised by the present applicant. In the figure, 1 is the lower mold, 11 and 12 are the main body side molding division pieces and the insertion part side molding division pieces of the lower mold 1, a1 is the main body molding surface of the lower mold 1, and a2 is the insertion part molding surface of the lower mold 1. , 3 is a hydraulic cylinder, 5, 5 is an outer frame, 10 is a hydraulic cylinder,
14 is an upper mold, b1 is a main body molding surface of the upper mold 14, b2 is an insertion portion molding surface of the upper mold 14, and b3 is a tapered molding surface of the upper mold 14.

Claims (1)

[Claims] 1 An apparatus for press-molding an inorganic powder into a roofing accessory having a reduction opening part with an arched cross-section through a stepped surface at one end of a main body with an arched cross-section, and a lower mold for molding the accessory is inserted. The main body molding part is divided at a position slightly away from the end of the molding part, and an upper and lower pedestal is provided for each other, and the insert molding side divided piece is fixedly supported on the upper pedestal, The main body molding side divided piece is supported by a hydraulic cylinder on the upper frame, outer frames are provided in front and behind the lower mold, each of these outer frames is integrally provided with a hopper guide, and each of the outer frames is provided with a hopper guide. is connected by a hydraulic cylinder to the lower surface of the lower mount via an arm that can be inserted through the upper and lower mounts, and the hopper guide is slidably fitted with a hopper having partition plates at the front and rear ends. A molding device for roof accessories.