JP5085381B2 - Tile mold - Google Patents

Description

  The present invention relates to a tile mold for compression molding a powdered tile raw material.

  Conventionally, the above-mentioned mold for forming a tile has a lower mold having a molding surface on the back surface of the tile and an upper mold having a molding surface of the tile surface, and a mold frame surrounding the lower mold and the lower mold; In the molding space formed by the above, it is configured to fill the powder raw material with powder cake sliding on the horizontal upper surface of the mold, and to lower the upper mold by the lifting device to compress the tile substrate. The lower mold includes a rubber whose upper surface is a molding surface of the back surface of the tile, a metal plate that is integrated with the rubber on the back surface side of the rubber except for the periphery, and a metal plate that is sealed on the back surface side of the metal plate Some have a receiving liquid and a lower mold body that supports the periphery of the rubber while enclosing the metal plate receiving liquid (see, for example, Patent Document 1).

  When the powder cake slides on the molding space, the upper layer portion of the powder material in the molding space is dragged forward by the powder cake, and the powder material is filled in the front side of the molding space. It becomes. Conversely, when powder dust slides back and forth on the molding space, the upper part of the powder raw material in the molding space is dragged to the rear side by the powder dust, and a large amount of powder raw material fills the rear side of the molding space. Will be. If the reciprocating sliding of the powder cake is thus completed and the raw material supply process is completed, as a result, a large amount of powder raw material is filled on the rear side of the molding space.

  However, in the above-described mold for mold forming, even if the pressing process is performed as it is, the periphery of the rubber is supported by the lower mold body, and the metal plate integrated with the rubber on the back side of the rubber is the rubber plate of the rubber. Since the metal plate is not at the periphery, the metal plate is inclined with respect to the lower mold main body and the base end portion (the outer periphery of the metal plate) in order to generate a uniform hydrostatic pressure in the metal plate receiving liquid in the pressurizing process. The part near the part is deformed and a uniform pressure can be applied to the powder raw material filled in the molding space, so that the powder material does not have a high density part and a low density part on the tile substrate, and is fired. Sometimes there is no difference in shrinkage, and the distortion of the tile after firing can be prevented.

Japanese Patent No. 3734974 (Claim 1, paragraph numbers [0010], [0022] to [0025])

  However, in the above prior art, even if the metal plate is inclined, it is possible to apply a uniform pressure by deformation at the peripheral edge of the rubber, but because the filling state with non-uniform density is always the same. Since the rubber deformed part is always the same part, the elastic deterioration of the part proceeds and eventually the deformation does not return and the metal plate is inclined and the process proceeds to the next tile substrate pressing step. Therefore, there was a problem that had to be solved, such as having to change the mold.

  In view of the problem that the rubber does not return from the deformed state due to the progress of the elastic deterioration and the metal plate remains in an inclined state based on the above-described conventional technology, the present invention provides a bottom surface of the recess in the lower mold body. The initial position of the rubber and the metal plate having a rod that is biased upward so that the projecting dimension from the metal plate is kept the same as the distance between the metal plate and the bottom surface of the recess and can be retracted downward as the metal plate is tilted By providing an automatic return means to the above, the rod and the metal plate are forcibly automatically returned to the initial position by moving the rod upward by urging after demolding the compression-molded tile base. To solve.

In short, the present invention is such that the lower mold body is biased upward so that the projecting dimension of the lower mold body from the bottom surface of the recess remains the same as the distance between the metal plate and the bottom surface of the recess, and the metal plate is inclined. Along with this, there is an automatic return means to the initial position of the rubber and metal plate that has a rod that can be retracted downward, so that when the tile base material compression-molded by such a molding die is removed, the rod automatically advances upward. Since the rubber and metal plate are pushed up, even if the rubber remains deformed due to elastic deterioration, the rubber and metal plate can be automatically returned to the initial position when the rod stops. The powder material of the tile substrate to be molded can be put in immediately after demolding, so it can be handled even if the molding speed per unit number is improved, and even if the rubber remains deformed, For that can either be used, it is possible to improve the service life.
However, if a high-viscosity metal plate receiving liquid is used, the return speed of the metal plate to the initial position due to the flow of the metal plate receiving liquid only becomes slow. It can be restored.
Furthermore, since the metal plate is supported downward by the metal plate receiving liquid and is not supported downward by the automatic return means, it is possible to cope with compression molding by a high pressure press.

Specifically, a stepped hole-shaped rod insertion hole is formed in the lower mold body, and the step formed on the rod is brought into contact with the step of the rod insertion hole so that the rod projection dimension is constant. The rod and the metal plate can be automatically stopped when the rod returns to the initial position, so that the rod can be automatically returned to the initial position with a simple structure. Since the compression spring provided between the bottoms of the insertion holes is used as the upward biasing means, the rubber and the metal plate can be pushed up by biasing the rod upward with a simple configuration.
Alternatively, a stepped hole-shaped rod insertion hole is formed in the lower die body, the step formed on the rod is brought into contact with the step of the rod insertion insertion hole, the rod protruding dimension is made constant, and the rod insertion Since the hydraulic oil is pressurized and filled in the lower space of the piston portion provided on the lower end side of the rod in the hole and the sealed space formed in the lower die body and communicating with the rod fitting insertion hole, it becomes the main of the upper biasing means. Even if the compressive force is continuously applied to the hydraulic oil, it does not deteriorate, so the structure is somewhat complicated, but the service life can be improved, and the hydraulic oil is provided above the sealed space. Since the escape space is formed between the oil surface of the hydraulic oil and the upper end of the escape passage, and the upper biasing means is used, even if the rod is retracted downward along with the metal plate inclined with the rubber during pressing, the hydraulic oil is compressed. , Hydraulic oil in the sealed space flows into the escape space Because, its practical effect very large like can be reliably downward retraction rod.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic sectional view of a press molding machine equipped with a tile molding die according to the present invention. In such a molding die, a rectangular plate-like lower mold 2 having a molding surface 1 on the back side of the tile. And a rectangular plate-shaped upper mold 3 having a molding surface (not shown) on the tile surface, and in a molding space 5 formed by the lower mold 2 and a mold 4 surrounding the lower mold 2. The tile raw material W is filled, and the upper die 3 is lowered by an elevating device (not shown) to compress and mold the tile base.

In the lower mold 2, as shown in FIGS. 2 to 9, a metal lower mold body 2 a, which has a rectangular recess 6 formed on the upper surface, like the upper mold 3 and the mold 4, and an outer peripheral portion. Is bonded to and integrated with the peripheral portion of the opening of the recess 6 on the upper surface of the lower die body 2a, and the rubber 7 constituting the molding surface 1 is accommodated in the recess 6 and bonded to the horizontal back surface 7a of the rubber 7. An integrated metal plate 8 made of the same material as the lower mold 2 and having a horizontal flat surface on the lower surface, and a metal plate receiving liquid filled in a space closed by the rubber 7 and the metal plate 8 in the recess 6 9 and rubber 7 provided on the lower die main body 2a and automatic return means 10, 10a for the metal plate 8.
That is, the upper surface of the lower mold 2 is the molding surface 1 formed by the rubber 7, and a plurality of concave grooves (not shown) for forming the back foot on the back surface of the tile are formed.
By configuring the lower mold 2 as described above, the metal plate 8 can be tilted three-dimensionally with respect to the lower mold body 2a together with the rubber 7, and the rubber 7 and the rubber 7 and the automatic return means 10, 10a. The inclination of the metal plate 8 and the accompanying deformation of the rubber 7 are restored to the initial state.

  In the automatic return means 10, 10a ..., the cylinders 11, 11a ... installed in the lower mold 2 are used, and the cylinders 11, 11a ... are configured as in the first embodiment shown in Figs. Alternatively, it is configured as in the second embodiment shown in FIGS. 6 to 9, but basically, the rod fitting insertion holes 12 that penetrate through the bottom surface of the bottom surface of the recess 6 in the lower mold body 2a to the lower surface side. The rod fitting insertion hole 12 is a stepped hole whose lower part 12b is larger in diameter than the upper part 12a. Has a rod body 13a and a piston portion 13b integrally formed at the lower end of the rod body 13a, and has a step portion 13c in contact with the step portion 12c of the rod fitting insertion hole 12 at the intermediate portion, At least the tip end portion of 13a is made smaller in diameter than the upper portion 12a of the rod insertion hole 12, and the tip end surface is the lower surface of the metal plate 8. The upper urging means 14 of the rod 13 is provided below the rod 13 so that the step portion 13c of the rod 13 is pressed against the step portion 12c of the rod fitting insertion hole 12, and the rod 13 The rod body 13a protrudes from the bottom surface of the recess 6 in the lower mold body 2a by a set dimension, specifically, a dimension between the bottom surface of the recess 6 and the bottom surface of the metal plate 8.

2 and 3 are a plan view and AA cross-sectional view of the lower die equipped with the cylinders 11, 11a of the first embodiment, and FIGS. 4 and 5 are cross-sectional views of the main part before and during pressing of the lower die of FIG. In each cylinder 11, 11a..., The rod body 13a itself of the rod 13 has a smaller diameter than the upper portion 12a of the rod fitting insertion hole 12, and the piston portion 13b is formed from the lower portion 12b of the rod fitting insertion hole 12. The rod 13 is slightly smaller in diameter so that the rod 13 can move up and down smoothly in the rod insertion hole 12.
The piston portion 13b is formed with a hollow portion 15 that opens on the lower surface, and a hole 17 is provided for communicating the hollow portion 15 with a gap 16 between the upper portion 12a of the rod fitting insertion hole 12 and the rod 13 (rod body 13a). It is formed in the piston portion 13b.
In the upper urging means 14, the compression spring 18 accommodated below the piston portion 13b of the rod 13 is used, and the upper and lower end surface portions of the compression spring 18 are the bottom of the rod fitting insertion hole 12, specifically, the rod A spring seat 20 that is recessed in the center of the upper surface of the cap body 19 that closes the lower opening of the insertion hole 12 and the hollow portion 15 of the piston portion 13b are accommodated, and the upper surface of the piston portion 13b, that is, the step portion 13c is inserted into the rod. The tip of the rod 13 is projected from the bottom surface of the recess 6 by a set dimension (a dimension between the bottom surface of the recess 6 and the lower surface of the metal plate 8) so as to be pressed against the step 12c of the insertion hole 12. It is in contact with the lower surface of the plate 8.
Therefore, the metal plate receiving liquid 9 is also filled between the gap 16, the hollow portion 15, the communication hole 17, and the lower surface of the rod 13 in the lower portion 12b of the rod fitting insertion hole 12, and is pressed during pressing. With the metal plate 8 tilted together with the rod 7, the rod 13 retreats downward and compresses and deforms the compression spring 19. After the molded tile base is removed from the mold, the metal plate 8 is moved together with the rubber 7 to the initial position by the elastic restoring force of the compression spring 19. (See FIGS. 4 and 5).
As the rod 13 moves backward, the metal plate receiving liquid 9 below the rod 13 in the hollow portion 15 and the rod fitting insertion hole 12 passes through the communication hole 17 without being compressed. It flows in the space formed on the upper surface side.

  The cap body 19 is fitted in a countersink recess having a larger diameter than the lower portion 12b formed in the lower opening of the rod fitting insertion hole 12, and is fixed by a plurality of bolts, etc. It is accommodated in an annular groove provided around the portion, is pressure-deformed, and is sealed on the upper surface of the countersink recess by an O-ring in close contact.

6 and 7 are a plan view and a BB cross-sectional view of the lower die equipped with the cylinders 11, 11a of the second embodiment, and FIGS. 8 and 9 are cross-sectional views of main parts before and during pressing of the lower die of FIG. In each cylinder 11, 11a, the upper part of the rod body 13a of the rod 13 is a small diameter part 13A, the lower part is a large diameter part 13B, the boundary part is a step part 13c, and the piston part 13b is The diameter is slightly smaller than the lower part 12b of the rod insertion hole 12. The inner peripheral surface of the lower portion 12b of the insertion hole 12 is sealed with an O-ring in close contact.
Further, the compression spring 21 is accommodated in the lower part 12b of the rod fitting insertion hole 12 and above the piston part 13b, and the upper and lower ends of the compression spring 21 are connected to the step part 12c of the rod fitting insertion hole 12 and the piston part 13b. It is made to contact with the upper surface.
In the upper urging means 14, a vertical straight passage 23 communicating with the rod fitting insertion hole 12 is provided below the rod fitting insertion hole 12 in the lower mold body 2a, and the adjacent straight passages 21 are arranged below each other. The mold main body 2a communicates with a horizontal horizontal connecting passage 24, and each communication passage 24 forms a series of annular passages 25 in the form of a square frame. 26 (see FIGS. 6 and 7).
Further, each of the plurality of openings formed at the time of drilling the connecting path 24 on the side surface of the lower mold body 2a is liquid-tightly closed by a stopper 27, so that the rods of the cylinders 11, 11a are inserted into the rods. A space below the rod 13 in the hole 12, a straight passage 23 communicating with the rod fitting insertion hole 12, and a ring passage 25 communicating with each straight passage 23 form a series of sealed spaces 28. 28 is filled with the hydraulic oil 29 so as to form a relief space 31 between the oil level 30 of the hydraulic oil 29 in the relief passage 26 and the upper end portion of the relief passage 26, so that the step portion 13c of the rod 13 is formed. The tip of the rod 13 is protruded from the bottom surface of the recess 6 by a set dimension so as to be pressed against the step portion 12c of the rod fitting insertion hole 12, and is brought into contact with the lower surface of the metal plate 8.
Therefore, the metal plate receiving liquid 9 is also filled between the gap 16 and the upper surface of the piston portion 13b of the rod 13 in the lower portion 12b of the rod fitting insertion hole 12, and is inclined with the rubber 7 during pressing. The rod 13 moves backward with the plate 8 and compresses the hydraulic oil 29, so that the oil level 30 of the hydraulic oil 29 in the escape passage 26 rises and the escape space 31 is compressed. After demolding, the rod 13 is moved up by the hydraulic oil 29 whose compression force has been released, so that the metal plate 8 is returned to the initial position together with the rubber 7 (see FIGS. 8 and 9).

  The lower mold body 2a is composed of two upper and lower members, and if the upper member 12a is formed in the upper member 12a and the lower member 12b and the sealed space 28 in the rod fitting hole 12 are formed in the lower member. A sleeve through which the rod body 13a penetrates is fitted into the upper opening of the lower portion 12b of the rod fitting insertion hole 12 on the upper surface of the lower member, and the outer periphery of the lower portion 12b of the rod fitting insertion hole 12 on the lower member upper surface. It is accommodated in an annular groove provided around the part, and is deformed by pressure and sealed by an O-ring in close contact with the lower surface of the upper member.

Further, as shown in FIGS. 10 (a) to 10 (c), a protrusion 32 having an extended tip portion is integrally provided on the back surface of the peripheral portion of the rubber 7, so that the lower mold body 2a (or the lower mold body 2a) is formed. The metal plate 8) is formed so as to mesh with the protrusion 32, or the metal plate receiving liquid 9 is provided with a leakage preventing groove 33 in the lower die body 2a and meshed with the rubber 7. It is preferable that the die main body 2a (or the rubber 7, the lower die main body 2a, and the metal plate 8) have a strong bonding force to improve sealing performance and prevent liquid leakage.
Further, the gap between the outer peripheral portion of the metal plate 8 and the inner peripheral surface of the recess 6 of the lower mold body 2a is widened, and the gap is filled with a soft elastic body such as silicon, so that the lower mold body 2a, rubber 7 and the buffer material 34 fixedly integrated with the metal plate 8 may be formed.

In the first and second embodiments, the number of the cylinders 11, 11a, which are the automatic return means 10, 10a, is three in the drawing.
In the drawing, the cylinders 11, 11a are integral with the lower mold body 2a. However, they may be separately embedded in the lower mold body 2a. In this case, although not shown, the cylinders 11, 11a,. A rod fitting insertion hole 12 is formed in the casing, and in the case of the second embodiment, a communication port to the straight passage 23 is formed at the bottom of the casing.

The upper surface of the mold 4 in the molding die configured as described above is equipped with a powder cake (not shown) that reciprocates from the right side to the left side (or vice versa). The powder material W is filled into the molding space 5 while the powdered soot is reciprocatingly moved on the mold 4.
In this case, as described above, the right side of the molding space 5 tends to have a larger amount of raw material input than the left side. Therefore, the filling density of the powder raw material W filled in the molding space 5 is the forward path start end side (right side) ) And the end side (left side) are greatly different, and FIG. 1 exaggerates the filling state of the powder raw material W in the molding space 5.
Then, when the powder raw material W filled in the molding space 5 is pressed and compressed by the lowering of the upper die 3, the powder raw material W becomes the rubber 7 of the lower die 2 and the metal plate 8 immediately below the rubber 7. Then, pressure is applied to the metal plate receiving liquid 9 below the metal plate 8.

  At this time, a strong pressure is generated in the high density filling portion of the powder raw material W in the molding space 5 (mainly on the right side where the amount of the raw material input tends to be large), and the high density filling portion in the rubber 7 and the metal plate 8 is generated. The metal plate receiving liquid 9 is strongly pushed down by the movement.

On the other hand, the pressure generated at the low density filling point of the powder raw material W in the molding space 5 is weak, and the corresponding part of the low density filling point in the rubber 7 and the metal plate 8 can be pushed down only weakly. The rubber 7 is received by the rigid metal plate 8 as a whole. Therefore, when the rubber 7 and the metal plate 8 at the high density filling portion are pushed down as described above (see FIG. 10B), mainly. On the opposite side, that is, on the right side, the rubber 7 at a lower density (left side) is pushed up together with the metal plate 8 by the metal plate receiving liquid 9 that has been pushed and moved (FIG. 10). In this way, the metal plate 8 together with the rubber 7 is tilted three-dimensionally, and is pushed down at the high density filling location and pushed up at the low density filling location to compress the powder raw material W, and the powder Raw material W is its overall packing density The difference in density of the compression molded so as to reduce the difference in vigorously occurs density on the left and right in particular molding space 5, as a result, fewer tiles green body be deformed by sintering shrinkage is molded.
In the molded tile base, the molding surface 1 of the lower mold 2 molds the back surface of the tile, and the rubber 7 forming the molding surface 1 has a flat metal plate 8 whose back surface 7a has rigidity. Since it is compressed in a certain state, the bottom surface of the back foot of the formed tile does not have unevenness, but it is formed very smoothly although it is extremely finely inclined.

At the time of the compression molding, the metal plate 8 is supported downward by the lower mold body 2a through the metal plate receiving liquid 9, but the rod 13 is supported by the metal plate receiving liquid 9 in the gap 16 which is a part of the metal plate 8. The rod 13 is retreated downward by pressing the step portion 13c downward, or the rod 13 is retreated directly by the downward inclination of the metal plate receiving liquid 9, and the upper biasing means after demolding the tile substrate 14 (compressed compression spring 19 or hydraulic oil 29) moves forward.
When the metal plate receiving liquid 9 has returned to the initial position at that time, the step 13c of the rod 13 is brought into contact with the lower surface of the metal plate receiving liquid 9, and the step 13c of the rod fitting hole 12 is When the rod 13 stops in contact with 12c and does not return or is in the process of returning, it contacts the lower surface of the metal plate receiving liquid 9 and pushes up the metal plate receiving liquid 9 to receive the metal plate At the same time as the liquid 9 is returned to the initial position, the step portion 13c of the rod 13 comes into contact with the step portion 12c of the rod fitting insertion hole 12, and the rod 13 stops.

It is a schematic sectional drawing of the press molding machine equipped with the tile shaping die concerning the present invention. It is a top view of the lower mold | type in the molding die of the tile of 1st Example. It is AA sectional drawing of FIG. It is principal part sectional drawing of the state before the press of the lower mold | type of FIG. It is principal part sectional drawing of the state during the press of the lower mold | type of FIG. It is a top view of the lower mold | type in the tile shaping die of 2nd Example. It is BB sectional drawing of FIG. It is principal part sectional drawing of the state before the press of the lower mold | type of FIG. It is principal part sectional drawing of the state during the press of the lower mold | type of FIG. It is an expanded sectional view of the perimeter corner part of the lower model in the tile forming metallic mold before press. It is an expanded sectional view of the outer periphery corner | angular part of the lower mold | type in the tile molding metal mold | die in the state in which the rubber and the metal plate fell during the press. It is an expanded sectional view of the outer periphery corner part of the lower mold in the tile forming die in a state where the rubber and the metal plate are raised during pressing.

Explanation of symbols

1 Molding surface 2 Lower mold
2a Lower die body 3 Upper die 4 Mold frame 5 Molding space 6 Recess 7 Rubber 8 Metal plate 9 Metal plate receiving liquid
10, 10a… Automatic return means
12 Rod insertion hole
12c Step
13 Rod
13b Piston part
13c Step
18 Compression spring
26 Escape passage
28 Sealed space
29 Hydraulic oil
30 Oil level
31 Relief space W Powder raw material

Claims (3)

It has a lower mold having a molding surface on the back side of the tile and an upper mold having a molding surface of the tile surface, and a powder raw material is filled in a molding space formed by the lower mold and a mold frame surrounding the lower mold. The upper die is lowered to compress the tile substrate, and the lower die is bonded to the lower die main body with a concave portion on the upper surface and the outer peripheral portion of the lower die body on the peripheral portion of the opening of the concave portion. An integrated rubber constituting the molding surface, a metal plate housed in the recess and bonded and integrated on the back surface of the rubber, and a space enclosed by the rubber and metal plate in the recess were filled. In a mold having a metal plate receiving liquid,
The lower mold body is biased upward so that the protruding dimension from the bottom surface of the recess in the lower mold body remains the same as the distance between the metal plate and the bottom surface of the recess, and can be retracted downward as the metal plate is inclined. A mold for forming a tile, characterized in that a means for automatically returning the rubber and the metal plate to the initial position is provided with a rod.   A stepped hole-shaped rod insertion hole is formed in the lower die body, the step formed on the rod is brought into contact with the step of the rod insertion hole, the rod protruding dimension is made constant, and the rod is provided on the lower end side of the rod 2. The tile molding die according to claim 1, wherein a compression spring provided between the piston portion and the bottom portion of the rod fitting insertion hole is used as an upward biasing means.   The lower die body is formed with a stepped hole-shaped rod insertion hole, the step formed on the rod is brought into contact with the step of the rod insertion hole, the rod protruding dimension is constant, The hydraulic oil is pressurized and filled in the lower space of the piston portion provided on the lower end side of the rod and the sealed space formed in the lower mold body and communicated with the rod fitting insertion hole, and provided above the sealed space. 2. The tile molding die according to claim 1, wherein a relief space is formed between the oil surface of the hydraulic oil in the relief passage and the upper end of the relief passage to form an upward biasing means.

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