JP2000263526A - Holding method for accessary tile of specified shape and molding tool thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformize the density of the whole of a raw material in the molding of a bending accessarry tile of specified shape. SOLUTION: When a tile C of specified shape with a second piece B bent to a first piece A is molded on one side of the flat first piece A, a powdery raw material fills a molding space of the first piece A and a space of the second piece B, and then the raw material filled in the molding space of the second piece B is compressed in the thickness direction of the second piece, and then the raw material filling the molding space of the first piece A and the molding space of the second piece B is pressurized from above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to dry molding of a tile for filling a tile material made of powder into a molding die and compressing the same, and is capable of giving a fired tile an accurate shape and quality. The present invention relates to a molding method and a molding die for a product tile.

[0002]

2. Description of the Related Art Conventionally, as a method of forming a curved tile (accessory tile) as shown in FIG. 5 by dry molding, a powder material is generally pressed and compressed using a chevron or inverted valley mold. After that, there is a method in which both ends are cut to predetermined dimensions and then fired.

[0003] However, the above-mentioned molding method has problems such that the product molding step and the cutting step are costly and the raw material loss is large. Therefore, as a molding method for obtaining a final product shape without the above-described cutting step, a method as shown in FIG.
No. 251413 and Japanese Patent Application Laid-Open No. 10-86118.

[0004] In the molding method shown in Fig. 9, a U-shaped fixed frame body 10 having a square planar shape and one open side is open.
And a movable frame 1 disposed on the open side of the fixed frame 101
02, a molding space 103 for forming the first piece A (thin plate-like portion) in the molded body shown in FIG. 5 with the stationary frame 101 and the movable space. The second piece B (bent portion) of the molded body between the frame 102 and the frame 102
And a fixed lower die 16 disposed at the lower end of the molding space 104. A powder raw material 107 is formed as shown in FIG. Is filled in the molding spaces 103 and 104, and then, as shown in FIG.
And a molded body C composed of the second piece B bent with respect to the first piece A.

[0005]

In the conventional molding method shown in FIG. 9, when a powder raw material is filled and pressure molded, the first plate portion A, which is a thin plate portion, is relatively uniform. Although the raw material can be packed with a high density, the second piece B, which is a bent portion, has a large filling depth, so that the raw material packing density tends to be uneven.

When the raw material with spots is formed, the raw material is compressed to a height of about half the filling depth of the raw material.
There is a problem that the quality of the tile is impaired because the second piece B is about twice as large as the upper surface of the tile.

Accordingly, an object of the present invention is to provide a method and a mold for forming an accessory tile which solve the above-mentioned problems.

[0008]

According to a first aspect of the present invention, a flat first piece is bent at one side with respect to the first piece. In molding the accessory tile having the second piece part, the molding space of the first piece part and the molding space of the second piece part are filled with a powdery raw material, and then the molding space of the second piece part The raw material filled in the second piece part is pressed and shrunk in the thickness direction of the second piece part, and then the raw material filled in the molding space of the first piece part and the raw material filled in the molding space of the second piece part are added from above. This is a forming method of the accessory tile, characterized by pressing.

When the first piece of the accessory tile is pressed in the thickness direction, the depth of the raw material of the second piece in the pressing direction is greater than the depth of the raw material of the first piece. Therefore, the compression ratio of the second piece is smaller than the compression ratio of the first piece. Therefore, as in the present invention, the raw material previously filled in the molding space of the second piece is compressed in the thickness direction to increase the density of the raw material, and then the first piece and the second piece are moved upward. , The density of the raw material in the first piece and the second piece can be made uniform. In addition, the fact that the first piece and the second piece can be made to have a uniform density as described above means that, in the spotted raw material, the spot density of the first piece and the second piece is made uniform and the aesthetic appearance is improved. Can be.

According to a second aspect of the present invention, there is provided a movable structure in which three sides of a quadrilateral form a U-shaped side frame and form another side, and advance and retreat from the side of the side frame toward the inside of the side frame. A movable lower mold that moves up and down in contact with the side frame is arranged inside a mold formed with a frame body, and a fixed lower mold is disposed between the movable lower mold and the movable frame body. Forming a molding space in the upper part of the movable lower mold and the upper part of the fixed lower mold, disposing an upper mold in the upper part of the molding space, filling the molding space with the raw material in a state in which the movable frame is retracted, Thereafter, the movable frame is advanced, and then the upper mold is lowered to pressurize the raw material in the molding space.

In the present invention, the same operation and effect as those of the first invention are exhibited, and the thickness width of the molding space for molding the curved portion which is the second piece of the molded product at the time of filling the raw material is reduced. Since the thickness is larger than the thickness of the second piece of the body, the depth of the raw material in the molding space can be made shallower than in the case of the conventional structure, so that the required amount of raw material can be filled. Therefore, it is easy to uniformly fill the raw material.

According to a third aspect of the present invention, the movable member moves in and out of the side of the side frame from the side of the side frame to form another side with the side frame having a square U-shape and three sides of a square. A movable lower mold that moves up and down in contact with the side frame is arranged inside a mold formed with a frame body, and a fixed lower mold is disposed between the movable lower mold and the movable frame body. Forming a molding space in the upper part of the movable lower mold and the upper part of the fixed lower mold, and setting the thickness of the fixed lower mold in the direction in which the movable lower mold and the movable frame oppose each other, Forming a small tile having a slightly smaller dimension and an upper end surface of the fixed lower die set to be at the same position as or lower than the lower surface of the movable frame when the raw material is charged. Type.

In the present invention, since the thickness of the fixed lower die in the direction in which the movable lower die and the movable frame oppose each other is set to a dimension slightly smaller than the thickness of the molded body after molding, the movable lower mold is formed during molding. When the mold and the movable frame descend, the molding can be performed without interference between the movable frame and the fixed lower mold. Further, since the upper end surface of the fixed lower mold is set to be at the same position as or lower position than the lower surface of the movable frame at the time of filling the raw material, the charged raw material is moved when the movable frame advances after the raw material is filled. Do not get caught between the movable frame and the fixed lower mold. That is, when the upper end of the fixed lower mold is located above the lower surface of the movable frame when filling the raw material, the gap between the movable frame that is retracted and the fixed lower mold is filled with the raw material, and when the movable frame advances, the gap is reduced. Although the raw material is sandwiched between the movable frame and the fixed lower mold, the movable frame cannot be advanced to a normal position, but by setting the upper end position of the fixed lower mold as described above, the raw material as described above is set. Does not occur. Therefore, the movable frame advances to the normal position, and a molded body having a predetermined thickness can be reliably molded.

According to a fourth aspect of the present invention, in the third aspect, the movable tile is provided with adjusting means for adjusting a retreat amount of the movable frame. It is a molding die.

In the present invention, the molding space formed between the movable frame and the movable lower mold can be adjusted by adjusting the retreat amount of the movable frame, and the thickness of the molded body can be easily adjusted.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the embodiments shown in FIGS. FIG. 1 is a longitudinal sectional view showing a molding die according to an embodiment of the present invention, and FIG. 2 is a plan view thereof.

The molding frame 1 has an outer frame 2 having a rectangular plane, and a side frame 3 having a U-shaped plane formed by three sides of the rectangle is fixed inside the outer frame 2. A movable frame 4 is provided on the open side so as to be able to advance and retreat in the direction of the internal space of the side frame 3, and to be slidable in close contact with a liner 5 below.

A rod 6a of a first fluid cylinder 6 is connected to the rear end surface of the movable frame 4 so that the movable frame 4 is moved forward and backward in the direction of the internal space of the side frame 3 by the first fluid cylinder 6. It has become.

The first fluid cylinder 6 is provided with an adjusting screw 6b constituting an adjusting means.
The forward / backward rotation is used to adjust the retracted position of the movable frame 4.

An elevating rod 7 is vertically connected to the lower surface of the molding die 1 comprising the outer frame 2, the side frame 3, the liner 5, and the fluid cylinder 6, that is, the lower surface of the outer frame 2. Penetrates the table 8 so as to be able to move up and down. Further, the lower end of the lifting / lowering rod 7 is connected to a second fluid cylinder 10 via a lifting / lowering plate 9, and by the raising / lowering operation of the second fluid cylinder 10, a forming mold is formed via the lifting / lowering plate 9 and the lifting / lowering rod 7. 1 as a whole goes up and down.

A stopper 11 for the upper limit and a stopper 12 for the lower limit can be adjusted in the up-and-down rod 7 in the vertical direction, respectively.
And it is provided so that it can be fixed at the adjustment position,
The material filling depth is changed by adjusting the upper and lower positions of the upper limit stopper 11, and the lower limit of the forming mold 1 is set by adjusting the upper and lower positions of the lower limit stopper 12.

The lower wall of the outer frame 2 has a movable lower insertion hole 13.
The lower end of the side frame 3 is open, and the movable lower die 14 is inserted through the movable lower die insertion hole 13 to form the side frame 3.
It rushes into the inside from below. Further, the movable lower die 14 is slidably provided on the inner surface of the side frame 3 and connected to the rod 15 a of the third fluid cylinder 15, and moves up and down by the raising and lowering operation of the third fluid cylinder 15. It has become. The rod 15a is provided with an upper limit stopper 16, which limits the upper limit of the rod 15a, that is, the upper limit of the movable lower die 14.

A fixed lower die 17 is integrally erected on the surface plate 8, and an upper portion thereof is slidably intruded between the movable lower die 14 and the liner 5 through the movable lower die insertion hole 13 so as to protrude. I have. The plate thickness of the fixed lower die 17 in the direction in which the movable lower die 14 and the movable frame 4 face each other is formed to be slightly smaller than the plate thickness of the molded body C after molding. Also,
The upper surface 17a of the fixed lower die 17 is set so as to be lower than the lower end surface 4c of the movable lower die 4 when filling the raw material. This position may be the same as the lower end surface 4c of the movable lower die 4.

With the above configuration, a horizontal first molding space 18 is formed by the inner surface 3a of the side frame 3 and the upper surface 14a of the movable lower die 14, and the inner surface 3a of the side frame 3 and the inner surface 4a of the movable frame body 4 are formed. And the side surface 14b of the movable lower die 14 and the upper surface 17a of the fixed lower die 17, a vertical second molding space 19 orthogonal to the first molding space 18 is formed.

On the upper part of the movable lower mold 14, the side frame 3
The upper die 20 which fits into the inner surface 3a of the movable frame 4 and the inner surface 4a of the movable frame 4 and pressurizes the raw material filled in the first and second molding spaces 18 and 19 can be moved up and down by a lifting drive means (not shown). Provided.

Next, the molding method of the present invention will be described, but before that, the problems of the conventional molding method will be described. FIG. 3 shows a raw material-filled shape and a molded body according to a conventional molding method, and the raw material of the thin plate portion A as the first piece is A
The raw material is filled to a depth of one dimension, and after pressing, is compressed to an A2 dimension. The bent portion B, which is the second piece, is filled with the raw material to the size B1 and compressed to the size B2 by pressing.

In the bent portion B, the width C1 for filling the raw material and the width (thickness) C2 of the compact are the same. Generally, the ratio A1 / A between the raw material filling depth and the thickness (height) of the compact.
2 and B1 / B2 are approximately twice (compression ratio = 2) in a porcelain tile or the like. Therefore, there is no problem in filling the raw material in the thin plate portion A, but in the bent portion B, if the height of the compact is B2 = 30 mm, B1 = 60 mm, and the raw material is filled from above into a narrow space of the compact thickness C1. Since it is supplied, it is difficult to always obtain uniformity of raw material filling.

In the raw material with spots, the filling depth B1 is the height of the compact B2 in the bent portion B as compared with the surface of the thin plate portion A, so that the density of spots per unit area of the surface is about 2 at the time of filling. The speckle density on the surface B is larger than the density of the speckles on the surface A shown in FIG. 5, and the surface A and the surface B are different from each other.

Next, the raw material filling method of the present invention will be described. First, the height of the first forming space 18 for forming the thin plate portion A as the first piece portion in FIG.
The bent portion B, which is the second piece portion, has the A1 size shown in FIG.
FIG. 4A shows the height of the second molding space 19 for molding
And the raw material filling width is C3.

In this case, the raw material filling amount of the bent portion B is shown in FIG.
If the amount is the same as that of the conventional method shown in FIG. That is, B1 ×
By determining the B3 dimension and the C3 dimension such that C1 = B3 × C3, a necessary amount of the raw material can be obtained.

Next, the first molding space 18 and the second molding space 19 are filled with a raw material of powder, and the raw material is filled into the widths A1, C3 and B3 shown in FIG. 4A, the raw material is pushed from the side of the bent portion B in FIG. 4A, and the thickness of the compact C is reduced to the dimension C2 to increase the raw material density of the bent portion B.

FIG. 4B shows this state. Thereafter, the upper surface of the thin plate portion A and the upper surface of the bent portion B are pressed and compressed by the upper die 20 from above, thereby forming a compact C. In this case, if C3 / C2 <1.5, the raw material pressed at the bent portion B remains powdery and is not solidified. It is possible to

Further, a specific embodiment of the present invention will be described by giving dimensions in FIGS. 3, 4 (a) and 4 (b). Assuming that the compression ratio when the raw material is charged into the compact is 2, the thickness of the thin plate portion A of the compact is A2 = 14.
mm, the material filling depth A1 = 28 mm, and if the height of the bent portion B is B2 = 32 mm, the material filling depth B1 = 64 mm. The transverse thickness of the bent part B is C2
= 14 mm, C1 = C2 in the conventional direction, so that the raw material filling thickness also becomes C2 = 14 mm.

Therefore, the amount of the raw material required for the bent portion B can be represented by the following formula in terms of the area shown in the figure. 64 mm × 14 mm = 896 mm ² Next, in FIG. 4B, A1 = 28 mm, A2 = 14
mm, C2 = 14 mm, and B3 = 47 mm, C
The dimension of 3 is 896 ÷ 47 = 19 mm.

Accordingly, in the conventional method, the raw material filling of the bent portion B is 64 mm in depth × 14 mm in width, but in the method of the present invention, it becomes 47 mm in depth × 19 mm in width. It is easy to enter, and uniform filling is always obtained. In this case, the horizontal preload was 19/14 = 1.36, and the vertical compression ratio was 47/32.
≒ 1.47. In the case of the spotted raw material, the density of the spots in the bent portion B is twice as large as that of the thin plate portion A in the conventional method, but is 1.47 times in the present invention, and is smaller in the thin plate portion A and the bent portion B than in the conventional method. The difference in speckle density is greatly improved, and the quality of the product is improved.

Next, the operation of each part will be described with reference to FIGS. 6, 7 and 8. First, the movable frame 4 is retreated and bent portion B
Forms a second molding space 19 having a wider width. In order to obtain accurate dimensions of the molded body, the dimensions of the second molding space 18 for filling the raw materials must be set. Therefore, the raw material filling depth of the first molding space 18 for molding the thin plate portion A is The limit height of the movable lower mold 14 is adjusted by adjusting the stopper 16.

The amount of raw material charged in the bent portion B is adjusted by adjusting the movable screw 4 with the adjusting screw 6 provided on the first fluid cylinder 6.
The width of the space between the movable lower mold 14 and the movable lower mold 14 is adjusted by changing the width b.

Next, the step of pressing the raw material will be described. 6, first, the movable frame 4 slides forward on the liner 5 by the first fluid cylinder 6 and the raw material of the bent portion B filled in the second molding space 19 is moved toward the movable lower mold 14. After that, the movable frame 4 is stopped when the lower projection 4b contacts the liner 5. This state is shown in FIG. In this case, the lower surface 4c of the movable frame 4 is the same height or slightly higher than the upper surface 17a of the fixed lower die 17, so that the inner surface of the movable frame 4, that is, the raw material contact surface 4a
The raw material is not pinched between the outer mold 17 and the outer surface 17b of the fixed lower mold 17.

Further, as described above, the raw material of the bent portion B does not have such a density as to solidify at this pressing stage, so that there is no hindrance to the main pressing by the upper mold 20.

Next, as shown in FIG. 7, the upper die 20 descends to compress the raw material under pressure. At this time, the upper mold 20 is subjected to a degassing step to discharge air in the raw material, and then the raw material is compressed to a finally required density by high pressure to form a compact. During this series of steps, the molding frame 1 in which the outer frame 2, the side frame 3, the movable frame 4 and the like are integrated is floatingly supported by the second fluid cylinder 10 during pressurization. Of the raw material and the friction between the side frame 3 and the movable frame 4. The movable lower die 14 is given a lifting force by the third fluid cylinder 15, and is pressed down by losing the pressing force of the upper die 20 while compressing the raw material between the upper die 20 and the platen at the lowermost end. 8 stops and then lifts.

At this time, since the fixed lower die 17 is immovable, the fixed lower die 17 is moved between the movable lower die 14 and the movable frame 4 by the lowering operation of the side frame 3, the movable frame 4 and the movable lower die 14. The material of the bent portion B is relatively pushed and enters.

When the movable frame 4 moves forward as described above and its lower projection 4b comes into contact with the liner 5 and stops, the raw material contact surface 4a of the movable frame 4 moves out of the fixed lower die 17. It is slightly (0.05 to 0.2 mm) outside of the side surface 17b, and does not interfere with the fixed lower mold 17 even when the movable frame 4 is lowered.

According to the result of these series of operations, the compact C
Means that the same double tightening effect as in the case where pressure is applied from both the upper and lower directions can be obtained. After the high-pressure application is completed, the upper mold 20 is slightly pressed against the molded body C, and the movable frame 4 is retracted by the first fluid cylinder 6 as shown in FIG.

Next, the second fluid cylinder 10 is lowered, and as shown in FIG. 8, the outer frame 2, the side frame 3, the movable frame 4 and the like are integrated, and the lower limit stopper 12 contacts the surface plate 8. Lower until touching. Thus, the molded body C can be pulled out from the molding mold (demolding). Next, after the upper mold 20 is raised, the molded body C is taken out.

According to such a molding method of the present invention, an uneven pattern, ie, an irregular pattern, is formed on the surface B of the molded product C shown in FIG.
There is also an advantage that the molded body C can be extracted even if there is an uneven molding surface on the inner surface of the movable frame 4.

[0046]

As described above, according to the first aspect of the present invention, the bent accessory tile can be formed to have a uniform density over the entirety, and when a spotted raw material is used, the entirety can be obtained. The aesthetic appearance can be improved by equalizing the density of speckles.

According to the second aspect of the present invention, it is easier to uniformly fill the raw material. According to the third aspect of the present invention, the molding can be performed, and at the time of molding, interference between the movable frame and the fixed lower mold can be prevented. Can be molded.

According to the fourth aspect of the present invention, the thickness of the molded body can be easily adjusted.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a molding die according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a diagram illustrating a conventional molding method.

4A and 4B are views for explaining the molding method of the present invention, wherein FIG. 4A shows a raw material charged state, and FIG.

FIG. 5 is a perspective view of a molded body.

FIG. 6 is a longitudinal sectional view of a raw material filling state in the present invention.

FIG. 7 is a longitudinal sectional view showing a state in which the bent portion is also pre-pressed and pressed by the upper die.

FIG. 8 is a longitudinal sectional view showing a state in which the molded article is released from the mold.

9A and 9B are longitudinal sectional views showing a conventional molding process.

[Explanation of symbols]

 3 Side frame 4 Movable frame 14 Movable lower mold 17 Fixed lower mold 18, 19 Molding space 20 Upper mold A First piece B Second piece (curved portion) C Mold

Claims (4)

[Claims] When forming an accessory tile having, on one side of a flat first piece, a second piece bent with respect to the first piece, a molding space of the first piece is formed. The molding space of the second piece portion is filled with a powdery raw material, and then the raw material filled in the molding space of the second piece portion is compressed and shrunk in the thickness direction of the second piece portion. A raw material filled in the molding space of the second part and a raw material filled in the molding space of the second piece are pressurized from above. 2. A mold frame comprising a side frame having a U-shape in plan view forming three sides of a quadrilateral and a movable frame body forming another side and moving back and forth from the side of the side frame toward the inside of the side frame. Inside, a movable lower mold that moves up and down in contact with the side frame is arranged, and a fixed lower mold is disposed between the movable lower mold and the movable frame body, and fixed to an upper portion of the movable lower mold. Forming a molding space on the upper part of the lower mold, disposing the upper mold on the upper part of the molding space, filling the raw material into the molding space with the movable frame retracted, and then moving the movable frame forward, A method for forming a tile for an accessory, comprising lowering an upper mold and pressurizing a raw material in a molding space. 3. A mold frame comprising a side frame having a U-shape in plan view forming three sides of a quadrangle and a movable frame body forming another side and moving back and forth from the side of the side frame toward the inside of the side frame. Inside, a movable lower mold that moves up and down in contact with the side frame is arranged, and a fixed lower mold is disposed between the movable lower mold and the movable frame body, and fixed to an upper portion of the movable lower mold. Forming a molding space in the upper part of the lower mold, the thickness of the fixed lower mold in the direction in which the movable lower mold and the movable frame oppose each other is set to a dimension slightly smaller than the thickness of the molded body after molding, and A mold for forming an accessory tile, wherein an upper end surface of the fixed lower die is set to be at the same position or a lower position with a lower surface of the movable frame when the raw material is charged. 4. The mold according to claim 3, wherein said movable frame is provided with adjusting means for adjusting a retreat amount of said movable frame.