JPH0155969B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for press-forming irregularly shaped tiles in a dry method.

[Conventional technology]

Tile manufacturing methods include dry and wet methods; the former produces tiles with more accurate shapes and dimensions and is harder.
In the dry construction method, the raw clay powder is press-molded, bisque fired at 900-1000℃, glazed, and then
Bake at 1250℃. Note that bisque firing may be omitted.

[Problem that the invention seeks to solve]

When performing press molding, it is required to fill a press mold (hereinafter referred to as a mold) with a predetermined amount of clay. There is no problem with standard tiles that are mass-produced and have fixed dimensions because there is a dedicated quantitative filling device.
Due to the small production volume of irregularly shaped tiles, especially edge-bending tiles, double-bending tiles, lintels, etc., dedicated fixed-quantity filling equipment was not used, and the clay was filled by hand.

As a result, uneven filling of the clay tends to occur, resulting in uneven density distribution of the product, resulting in cracks and defects during firing. In addition, a high level of skill was required to fill the container uniformly by hand, which resulted in low work efficiency.

[Means for solving problems]

This is a press-molding method for irregularly shaped tiles with an L-shaped cross section, in which the upper mold is lowered onto a fixed lower mold with an upward opening in a substantially V-shape. (b) move a pair of hopper nozzle assemblies containing a certain amount of powdered material along both sides of the upper and lower molds, and use gravity to close the gap between the upper and lower molds; (c) The upper mold is lowered slightly and vibrated by a vibration device to solidify the raw material uniformly. (d) A pair of suction nozzles are applied to both sides of the upper and lower molds. Move it along the surface and use negative pressure to suction and remove excess raw material protruding from both sides of the upper and lower molds. At the same time, (e) lower the upper mold to the regular molding position to finish the raw material. (f) A press molding method for irregularly shaped tiles is achieved in which the upper mold is raised and the molded product is manually removed from the lower mold.

〔Example〕

Hereinafter, the present invention will be explained regarding irregularly shaped tiles having an L-shaped cross section.

As shown in FIG. 1, the apparatus for carrying out the present invention utilizes an ordinary press 1, and 2 and 3 are paired upper and lower dies, respectively, which make the press economical. A plurality of pairs of upper and lower molds 2, 3 are mounted for use. The press 1 is provided with a pair of horizontal guide rails 4, along which a hopper nozzle assembly 5 is attached so as to be able to slide left and right on both sides of the upper and lower dies 2 and 3 by an arbitrary drive device. . The upper mold 2 is attached to the ram of a press (not shown).
Further, the lower die 3 is held between a frame 6 fixed to the press 1. Another pair of horizontal guide rails 7 are fixed to the press 1, and a suction nozzle 8 connected to a suction source (not shown) moves both sides of the upper and lower dies 2, 3 onto the guide rails 7.
The tip of the suction nozzle 8 is formed to move along the upper surface 6A of the frame 6 at that time.

Next, the operating sequence of the present invention will be explained with reference to FIGS. 2-5.

(a) First, the press 1 is started and the upper die 2 is lowered to an intermediate position slightly above the normal molding position (indicated by a broken line in FIG. 2). In this case, the gap between the upper and lower molds 2 and 3 is set so that the nozzle tip of the hopper nozzle assembly 5 can be inserted therein.

(b) A pair of hopper nozzles 5 containing a fixed amount of powdered raw material (clay) are arranged, for example, on the right side of FIG.
It moves along both sides of the arrow and stops for about 1 second at the left end of the arrow. During this movement, the upper and lower molds 2,
The raw material is fed into the gap between the three, but in this case the raw material is not evenly distributed yet. Then it moves back towards the right side. The reason for temporarily stopping at the left end is to sufficiently supply the raw material to the lower die 3 even at the left end.

(c) The upper mold 2 is lowered slightly and the raw material between the upper and lower molds 2 and 3 is compacted through a vibration device (not shown). At this time, excess raw material is removed to both sides between the upper and lower molds, so that a substantially quantitative amount of raw material corresponding to the space volume between the molds is accommodated between the two molds. This vibration makes the distribution of the raw material uniform, and the raw material is tamped by the upper mold 2 to become semi-solidified (FIG. 3).

(d) The suction nozzle 8 is disposed on the left side of the press 1 (Fig. 1), and moves reciprocally along the solid and broken line arrows to close the upper and lower molds 2 and 3 during compaction of the raw material.
Excess raw materials that are not semi-solidified, that is, not compacted, protruding from both sides of the frame 6, that is, the upper surface 6A of the frame 6, are removed by suction. This sucked raw material can be reused (Fig. 4) At the same time, (e) the upper mold 2 is lowered to the regular molding position and a strong pressure is applied to the raw material to completely solidify it and produce the final product. Pressure mold into the shape.

(f) Raise the upper mold 2 and manually take out the molded product 9 from the lower mold 3 (Fig. 5).

〔Effect of the invention〕

The present invention is configured as described above, and the raw material supply and filling is automated in a simple manner, so the work efficiency is improved, and the packing density of the raw materials is made uniform, so that defects such as cracks in the product do not occur during firing. There is no.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the entire apparatus for implementing the present invention, and FIGS. 2 to 5 are schematic diagrams showing the manufacturing process of the present invention. 2... Upper mold, 3... Lower mold, 5... Hopper nozzle assembly, 8... Suction nozzle, 9... Molded product.

Claims (1)

[Scope of Claims] 1. A press-molding method for irregularly shaped tiles with an L-shaped cross section, which is carried out by lowering an upper mold onto a fixed lower mold with an upward opening in a substantially V shape, comprising: (a) an upper mold; (b) A pair of hopper nozzle assemblies containing a certain amount of powdered raw material are moved along both sides of the upper and lower molds to utilize gravity. (c) The upper mold is lowered slightly and vibrated by a vibration device to uniformly harden the raw material, (d) a pair of The suction nozzle is moved along both sides of the upper and lower molds, and the excess material protruding from both sides of the upper and lower molds is suctioned away using negative pressure. At the same time, (e) the upper mold is moved toward the normal molding position Press molding method for irregularly shaped tiles, in which the raw material is finished formed by lowering the upper mold, and (f) the upper mold is raised and the molded product is manually taken out from the lower mold.