JPH0146290B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a mold for press-molding the base material of ceramic products such as roof tiles and bricks. The present invention relates to a mold for molding a ceramic product base, which allows sufficient air removal between the base surface and the base surface.

(Prior Art) In the conventional molding of a ceramic product base, as shown in FIGS. 5 and 6, when pressing a base c between an upper mold a and a lower mold b, the upper and lower molds a, The air interposed between the molding surfaces d and e of b and the upper and lower surfaces of the substrate c is drawn from the gap g or deaeration hole h provided between the mold and the formwork f, as indicated by the arrow i in Fig. 6. I missed out on that route.

(Problems to be Solved by the Invention) However, in such a method, even if sufficient air is removed from the vicinity of the formwork f, that is, at the peripheral edge of the substrate c, the molds a and b After the molding surfaces d and e begin to be pressed together, the air remaining in the corners j of the stepped portions or uneven portions on the inside of the molding surfaces d and e has no escape route, so the air cannot be vented. A large amount of the mold release agent applied to E was accumulated in this part, and due to the presence of such air or mold release agent, the filling of the base material into that part was insufficient. For this reason, molded products with incomplete molding of stepped or uneven parts corresponding to the molding surface, or molded products in which such parts shrink excessively during drying and firing, resulting in cracks, are produced. There was a problem.

Therefore, the technical problem to be solved by the present invention is to sufficiently vent air from the corners of the stepped portions or uneven portions provided on the molding surface of the mold in press molding of ceramic product bases. .

(Means for solving the problem) A technical means for solving the above problem is to configure the stepped portion or uneven portion on the molding surface of the mold with a separate insert attached to the mold body, and to The slit or hole provided at the boundary between the molding surfaces is communicated with the outside of the mold via a gap provided along the joint surfaces of the two.

(Function) During press molding of ceramic product bases, air remaining in the corners of the stepped portions or uneven portions of the mold is removed through slits or holes opened in the corners of the stepped portions or uneven portions. The base material is also sufficiently filled in the area. Therefore, an excessive amount of the mold release agent will not accumulate in these parts.

(Example) Next, an example of the present invention will be described based on FIGS. 1 to 3.

The molding mold of this embodiment is a mold for molding roof tiles as shown in FIGS. It has 3 and 4.

The part of the upper mold body 1 for forming the butt-side draining step and the part of the lower mold body 2 for forming the buttock are respectively attached to inserts 5 and 6 formed separately from the mold bodies 1 and 2. Thus, when the inserts 5 and 6 are attached to the mold bodies 1 and 2, respectively, the step for forming the butt-side draining step on the molding surface 3 and the step for forming the tail sword on the molding surface 4 are formed. It is starting to form.

The inserts 5 and 6 have a large number of air release grooves 7, 7..., 8, 8 along the joint surfaces with the mold bodies 1 and 2.
... are provided, and one end of these grooves 7, 7..., 8, 8... is open to the molding surfaces 3, 4, respectively, and the other end is a notch for attaching the insert in the mold bodies 1, 2. They communicate with air vent holes 11, 11, . . . , 12, 12, .

Further, the mold bodies 1, 2 and the inserts 5, 6 are provided with holes 13, 14 for inserting mounting bolts, respectively.

This embodiment is configured as described above and is used as follows.

That is, as shown in FIG. 2, with the insert 5 attached to the upper mold body 1, these are fixed to the formwork 17 with the mounting bolts 15, and the insert 6 is
are attached to the lower die main body 2 by cap bolts 16, and these are set in a press machine with an appropriate mechanism (not shown).

Then, when the roof tile base 19 placed between the upper and lower mold bodies 1 and 2 is pressed, the air remaining in the corner 20 of the step for forming the butt side draining step in the upper mold body 1 is removed from the groove 7. , the air that has passed through the hole 11 and remained in the corner 21 of the step for forming the tail in the lower mold body 2 passes through the groove 8 and the hole 12,
The release agent is removed as indicated by arrows 22 and 23 in FIG. 2, respectively, so that a large amount of mold release agent does not accumulate in the corners 20 and 21 of these steps, and the base material is sufficiently filled.

Therefore, the butt-side draining step 25 and the buttock 26 of the molded product 24 shown in FIG. 3 are completely molded, and no cracks are produced in these parts during the drying and firing steps.

In addition, in this example, the upper and lower mold bodies 1 and 2
Other stepped portions or uneven portions on the molding surfaces 3 and 4,
For example, as shown by the imaginary line in FIG. 2, a step 28 of the molding surface 4 for forming the crosspiece mounting portion 27 shown in FIG. A large number of air vent grooves 30 may be provided along the joint surface of the insert 29 with the lower mold body 2.

In addition, as a modification of the present embodiment, the grooves 7,
8 and 30 may be provided along the joint surface with the inserts 5 and 6 or the insert 29 in the mold bodies 1 and 2.

Furthermore, the nest 5 of the above configuration in this embodiment,
6 or the insert 29 is the step part 3 for hanging of the molded product 24.
1, the molding surface 3 to form the drainage groove 32, etc.
It can also be used as a component of the step portion 33 and protrusion 34 provided in the fourth portion.

Another embodiment of the present invention is a mold for molding a brick 36 having a protrusion 35 on the surface, in which a recess corresponding to the protrusion on the molding surface is formed separately from the mold body. It may also be constructed by a nest having a groove for venting air. (Illustration omitted).

(Effects) The present invention provides press forming of ceramic product bases.
It is possible to completely mold the stepped portions and uneven portions, and also has the effect of preventing the occurrence of cracks in the uneven portions and stepped portions during the drying and firing process of the molded product.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of one embodiment of the present invention;
The figure is a vertical sectional view showing its usage condition, Figure 3 a, b
4 is a perspective view showing a molded product according to another embodiment of the present invention, FIG. 5 is a vertical sectional view showing a conventional example, and FIG. FIG. 3 is a vertical cross-sectional view of a main part showing a state during molding. 1...Upper mold main body, 2...Lower mold main body, 3, 4...
Molding surface, 5, 6... insert 7, 8... groove.

Claims (1)

[Claims] 1. Steps or uneven parts on the molding surface of the mold are
It consists of a separate insert attached to the mold body, and a slit or hole is provided at the boundary between the molding surfaces of the two.
A mold for molding a ceramic product base, characterized in that the mold communicates with the outside of the mold through a gap provided along the joint surfaces of the two.