JPH07132512A - Pavement block forming mold - Google Patents

Abstract

PURPOSE:To prevent damage at a rubbing part of a molded body and a pin by dividing an upper mold into an upper piece clog and an upper piece and making them separable by a spring, making an inserting part at a pin tip on the peripheral face of the upper piece clog to be engaged with and disengaged from a trapezoid groove on the peripheral face of the upper piece, maintaining the molded matter by the upper piece at mold release, and extracting the pin in that state. CONSTITUTION:An upper mold 3 is constituted of an upper piece 9 and an upper piece clog 8 which are separable from each other by a compression spring 24. A cavity 4 is formed in between a lower mold 7 and the upper piece 9, in which a molding material M is inserted so as to mold a block by pressure of the upper piece 9. A pin 31 is arranged on the peripheral face of the upper piece clog 8 and an inserting part 32 at the tip of the pin is arranged in a manner that it can be inserted into a trapezoid groove 50 on the peripheral face of the upper piece 9. At mold release, the upper piece clog 8 rises in advance in a state that the upper piece 9 is pressed against the surface of a molded body by the compression spring 24 which is in a compressed state, and only the protruded inserting part 32 is raised. Accordingly, damage of the block can be prevented by the rubbing of the block and the inserting part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a paving stone block molding die for molding a paving stone block laid on a pavement.

[0002]

2. Description of the Related Art Conventionally, as a paving stone block to be laid on a pavement or the like, a paving stone block having four side surfaces provided with spacers in a vertical direction is used in order to easily secure a joint gap between the paving stone blocks. Before laying, the sand stones are sprinkled on the ground before laying, and the stone blocks are simply arranged and placed, and joint sand is inserted between the stone blocks so that even an inexperienced worker can lay it easily and in a short time. Therefore, the upper end of the spacer is molded to be lower than the upper surface of the block so that the spacer is not exposed after filling the joint sand.

Therefore, as a method of manufacturing the paving stone block, a cavity corresponding to an upper die arranged in parallel on the lower surface of an upper piece plate which is controlled to move up and down is opened in parallel with the die frame, and the cavity is made to face the die frame. The lower die is mounted on the upper surface of the lower piece base which is vertically moved, and the pins are arranged at the positions corresponding to the spacers on the peripheral surface of the upper die, and the tips of the pins are projected from the lower surface of the upper die, and the cavities are Trapezoidal at the tip of the pin by compressing the powder raw material filled in the cavity with the upper mold, which can be freely inserted into and removed from the trapezoidal groove forming the spacer of the paving stone block formed on the inner wall surface forming the tee The powder raw material on the upper part of the groove is removed to form a spacer lacking part, and the molded body is compression molded so that the upper end of the spacer is lower than the upper surface of the block.

However, when the upper die is lifted at the time of demolding, the raw material in the compressed state slightly expands due to the restoring force, and the pressure contact force due to the expansion of the molded body acts on the pin to increase the frictional resistance between the molded body and the pin. When the pin is brought into close contact, a force that displaces the sliding contact portion of the molded body due to the rise of the pin acts, while a gap is created between the upper surface of the molded body and the lower surface of the upper mold, and the pressing force on the upper surface of the molded body is eliminated. As a result, the corner portion of the sliding contact portion with the pin tip portion, which is weak in strength, is misaligned and is likely to be chipped off, resulting in a high defect rate and a poor yield.

On the other hand, if the mold is turned upside down and molding is performed, it is possible to prevent the molded body from being damaged at the time of demolding. However, after molding, the molded body is conveyed to the next step in the inverted state with the surface side down. If this is done, the surface side is likely to be damaged, so there is the disadvantage that a reversing device for the molded body is required. For example, when molding a paving stone block with patterns such as spots on the surface side, or the raw material for the upper and lower layers. When the paving stone block using an expensive high-quality raw material is molded in the upper layer part by changing the above, damage to the molded body can be prevented, but a new defect occurs.

That is, when the paving stone block is formed as a two-layer body so that the spacer-missing portion is on the lower side, the powder raw material constituting the upper layer portion of the molded body is first charged into the cavity, and thus the powder is used. Considering the deposition state of the body material, fine particles tend to be unevenly distributed in the peripheral portion on the surface side of the molded body at the bottom of the cavity, or vibration during the second filling operation of the powder material constituting the lower layer portion. Due to the pressure and drop impact, fine particles uniformly enter between the coarse particles in the upper layer to reduce the coarse particle density, resulting in a non-uniform pattern or a low spot density during firing, and a desired uniform and clear pattern is obtained. It has a drawback that it is not obtained or uneven firing shrinkage strain occurs due to uneven particle size distribution.

[0007]

DISCLOSURE OF THE INVENTION The present invention prevents the molded body from being damaged when the upper die is removed from the mold, and when the powder raw material is filled, the lower layer portion and the upper layer portion are filled with the respective powder raw materials in this order. Then, the present invention provides a paving stone block molding die in which a clear pattern or the like is not exposed on the surface of the paving stone block or uneven firing shrinkage distortion is generated.

[0008]

SUMMARY OF THE INVENTION The present invention is based on the above-mentioned prior art, and when the upper die for molding the surface side of the molded body is released from the mold, the corner portion of the sliding contact portion with the pin tip portion of the molded body is lost. In consideration of the above, the upper die arranged at a position corresponding to the upper side of the cavity for filling the raw material is divided into an upper piece geta and an upper piece, and the upper piece is attached to and detachable from the upper piece geta so that the upper piece geta and the upper piece geta. A flexible spacing member such as a compression spring is placed between the pieces, and pins are fixed on the peripheral surface of the upper piece geta. By protruding and retracting from the bottom surface of the piece, the upper piece geta rises in advance in a state where the upper piece is pressed, pressed and brought into contact with the surface of the molded body by the separating member in the compressed state during demolding, and only the protruding insertion part I try to raise it.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings, in which 1 is a paving stone block molding die according to the present invention, the die 1 being parallel to the lower surface of an upper piece plate 2 which is controlled to move up and down. The upper molds 3 and 3a for molding the surface side of the molded body W, the mold frame 5 in which the cavities 4, 4a corresponding to the upper molds 3 and 3a are opened in parallel, and the mold frame. Lower dies 7, 7a mounted on the upper surface of a lower piece base 6 configured to move up and down relative to 5.
, And each upper mold 3, 3a is divided into an upper piece geta 8 and an upper piece 9, and the upper piece 9 is attached to and detachable from the upper piece geta 8 to form a gap 10 therebetween. The lower molds 7, 7a ... Are respectively cavities 4, 4a in the lower piece base 6.
.. and a lower piece 12 mounted on the upper surface of the mounting base 11.

Although the lower surface of the upper piece 9 is an uneven surface in the drawing,
The shape is not limited to this, and a smooth surface may be used depending on the paving stone block B, and a plurality of upper molds 3, 3a, etc. have been described, but the molded bodies W may be molded one by one.

Reference numerals 13 and 13a are fixing bolts for the upper piece plate 2 and the upper piece geta 8, and the fixing bolts 13, 13a ... are mounting portions 14, 14a of the upper molds 3, 3a on the upper piece plate 2 and four corners thereof. The stepped holes 15, 15a ... Penetrating the part are inserted and screwed into the bolt holes 16, 16a on the upper surface of the upper piece geta 8 to fix the upper piece geta 8 to the upper piece plate 2. .

Numerals 17, 17a ... are hanging bolts for suspending the upper piece 9 from the upper piece geta 8, and the hanging bolt 1
7 and 17a are vertically movably inserted into stepped holes 18 and 18a formed through the upper piece geta 8, and the hanging bolts 17 and 17 are
a ... The tip end is screwed into the bolt holes 19, 19a ... of the upper piece 9, and the bolt head 20 of each suspension bolt 17, 17a ... is stepped hole 18, 18a.
The gap between the upper piece geta 8 and the upper piece 9 when hooked on the step 21 of
10 is the maximum width, and stepped holes 18 and 18a in the upper piece plate 2
The receiving holes 22, 22a of the bolt head 20 when the upper piece geta 8 and the upper piece 9 are in contact with each other are provided at positions corresponding to.

Numerals 23, 23a are elastic spacing members arranged between the upper piece geta 8 and the upper piece 9, and in the present embodiment, the spacing members 23, 23a ... are compression springs 24, 24a. , Such compression springs 24, 24a….
, 26, 26a are formed on the lower surface of the upper piece geta 8 and the upper surface of the upper piece 9.

The spacing members 23, 23a ... Are compression springs 24, 24.
It is not limited to a ..., For example, a hydraulic / pneumatic cylinder or the like may be used as long as it can press the upper piece 9 downward against the upper piece geta 8 and can expand and contract.

Denoted at 27, 27a are guide shafts of the upper piece 9, and the lower end portions of the guide shafts 27, 27a are fitted into fixing holes 28, 28a formed at four corners of the upper surface of the upper piece 9. At the same time, the guide shafts 27, 27a ... are fixed to the upper piece 9 by screws 29, 29a ... screwed from the side surface of the upper piece 9, and the upper ends of the guide shafts 27, 27a ... are provided at corresponding positions in the upper piece geta 8. The shaft insertion holes 30, 30a are slidably inserted into the shaft insertion holes 30, 30a, and the gap between the upper end of the shaft insertion holes 30 and 30a and the lower surface of the upper piece plate 2 is set wider than the maximum width of the gap portion 10.

Reference numerals 31 and 31a are pins arranged on four side surfaces of the upper piece geta 8 of each upper die 3, 3a.
Are arranged at positions corresponding to the spacers S, Sa ... in the paving stone block B, and the pins 31, 31a ...
The insertion portion 32 has the same shape as S1 ..., the inner surface of the insertion portion 32 is slidably contactable with the side surface of the upper piece 9, and the insertion portion 32 is narrowed down due to the narrowing of the gap 10. It is designed to project from the bottom surface.

33, 33a ... Are mounting portions 14 on the upper piece plate 2,
14a ... Air holes provided in the center, and the air holes 33, 33
The a ... are formed at right angles to one side surface of the upper piece plate 2 in the long side direction so as not to reach the other side surface.

Reference numerals 34, 34a are air introducing holes penetrating from the respective air holes 33, 33a to the lower surface side of the upper piece plate 2, and the air blowing holes 35, 35a which are continuous with the air introducing holes 34, 34a. It is installed in the piece geta 8.

Numerals 36, 36a ... are notches for attachment to the main body of the press machine provided on the long sides of the upper piece plate 2, and 37, 37a ... are stoppers provided on both sides of the rear surface of the upper piece plate 2. .

Further, in another embodiment, the horizontal frames 38, 38a arranged in the parallel direction of the upper molds 3, 3a ... And the vertical frame arranged on the side of the upper molds 3, 3a ... Between the horizontal frames 38, 38a. Surrounding the upper molds 3, 3a ... With frames 39, 39a ..., Inner side surfaces of the lateral frames 38, 38a and both sides of the vertical frames 39, 39a ... And upper molds 3, 3a in the vertical frames 39, 39a. The notches 40, 40a are formed at the positions corresponding to the pins 31, 31a on both sides of the space between the ..., and the blow ports 41, 41a communicating with the gap 10 between the upper piece geta 8 and the upper piece 9 are formed. And suction port
42 are provided below the upper piece geta 8 in the horizontal frames 38, 38a, and the lower surfaces of the vertical and horizontal frames 38, 38a 39, 39a ... Are set higher than the stoppers 37, 37a.

Reference numeral 43 denotes a liner portion arranged in the center of the mold frame 5, which has a pair of horizontal liners 44, 44a arranged side by side and vertical liners 45, 45a.
A collar portion 46 is integrally formed on the upper outside of the horizontal liners 44, 44a, vertical liners 45, 45a, to form a liner portion 43, and the horizontal liners 44, 44a and the vertical liners 45, 45a ... form the cavities 4, 4a. ... and the vertical liners 45, 45a
... The upper surface is set slightly lower than the horizontal liners 44, 44a to form step portions 47, 47a ..., and the flange portion 46 of the liner portion 43 is placed and fixed on the step portion 49 in the mounting opening 48 of the mold frame 5. Thus, the liner portion 43 is attached to the mold frame 5.

50, 50a are trapezoidal grooves for molding the spacers S, Sa of the paving stone block B, and the trapezoidal grooves 50, 50a.
Are formed on the inner wall surfaces forming the cavities 4, 4a ... In the vertical direction of the lateral liners 44, 44a and the vertical liners 45, 45a ... Sideways, and the trapezoidal grooves 50, 50a.
The insert portions 32 of the pins 31, 31a in the ... Are freely removable.

Next, the operation of the paving stone block molding die according to the present invention will be described. First, a charger (not shown) is reciprocated above the die frame 5 so that the cavities 4, 4a ... When the powder material M is filled and then the upper piece plate 2 is lowered, the upper piece 9 comes into contact with the powder material M in the cavities 4, 4a. Element
The compression springs 24, 24a, which are 23, 23a, are compressed, and the pins 31, 31a ... the leading end side insertion portion 32 is fitted into the trapezoidal grooves 50, 50a ... upper part in advance of the upper piece 9 and the corresponding portion. While removing the powder raw material M, the gap 10 between the upper piece geta 8 and the upper piece 9 is gradually narrowed, and the upper piece geta 8 and the upper piece 9 come into contact with each other. The powder raw material M is gradually lowered and gradually compressed, and the upper piece plate 2 is lowered until the stoppers 37, 37a ... Contact the upper surface of the mold frame 5.

Next, when the upper piece plate 2 is lifted after compression molding, the upper piece 9 is pressed by the upper piece 9 against the upper surface of the formed body W by the compression springs 24, 24a. Upward movement of the upper piece 9 is suppressed so that the pressing force on the upper surface of the body W is gradually decreased and the contact state is changed to the next contact state.

By the rise of the upper piece geta 8, the pins 31, 31
a ... The insertion portion 32 on the tip side is gradually pulled out from the trapezoidal grooves 50, 50a ... to form a trapezoidal groove 50, 50a ... upper portion as a space portion, and a gap portion 10 between the upper piece geta 8 and the upper piece 9 is formed. While gradually expanding, the bolt heads 20 of the hanging bolts 17, 17a ... have stepped holes 18,
When the upper piece 9 is lifted together with the upper piece geta 8, the upper dies 3, 3a ... , 7a ..., The molded body W is exposed on the mold frame 5, and is carried out to the next step by an appropriate means.

When molding a two-layer paving stone block B having a pattern such as spots on the surface or using an expensive and high-quality powder raw material M in the upper layer portion, the powder raw material M in the lower layer portion is formed.
After filling the cavities 4, 4a, ... Of the powdery material M of the upper layer, the fine particles in the powdery material M are separated from the vertical liners 45, 45a.
The powder material M falling into the spaces 47, 47a, ..., Filling the cavities 4, 4a ... Is in a good distribution state, and the pattern is made uniform by the powder material M having such a uniform particle size.

Further, from the air holes 33, 33a of the upper piece plate 2 through the air introduction holes 34, 34a, and the air outlet holes 35, 35a, air is supplied to the gap portion 10 between the upper piece geta 8 and the upper piece 9. The air is jetted at all times or at the time of demolding, or the air is jetted from the blowing ports 41, 41a ... To the gap portion 10 between the upper piece geta 8 and the upper piece 9 and is sucked from the suction ports 42, 42a. Department
The powder material M that has entered 10 is forcibly excluded.

[0028]

In summary, according to the present invention, an upper mold for molding the surface of a molded body is arranged on the lower surface of an upper piece plate which is controlled to move up and down, a mold frame is arranged below the upper mold, and the mold frame is formed. At the corresponding position of the upper mold in, open the cavity to fill the raw material,
In the mold in which the lower mold is mounted on the upper surface of the lower piece base that is configured to move up and down relatively to the mold frame, and the trapezoidal groove that forms the spacer of the paving stone block is formed on the inner wall surface that forms the cavity, The upper molds 3, 3a ... Are divided into upper piece geta 8 and upper piece 9, and the upper piece 9 is attached to and detachable from the upper piece geta 8 to allow expansion and contraction between the upper piece geta 8 and the upper piece 9. Separation members 23, 23
a ... is arranged to make the upper piece geta peripheral surface 8 the cavity 4,
Pins 31, 31a ... at positions corresponding to the trapezoidal grooves 50, 50a ... of 4a ...
And the pins 31, 31a ... Insert portion 32 on the tip side
The trapezoidal groove 50, 50a ...
0, 50a… Spacers S, Sa of paving stone block B…
And the upper portions of the spacers S, Sa ... are lower than the surface of the paving stone block B and can be integrally molded by one molding operation.

Further, the upper molds 3, 3a ... Are divided into upper piece geta 8 and upper piece 9, and the upper piece 9 is attached to and detachable from the upper piece geta 8 to obtain the upper piece geta 8 and the upper piece 9. A spacing member 23 that can expand and contract in between,
23a are provided, and the pins 31, 31a are provided on the peripheral surface 8 of the upper piece geta. Therefore, the separating members 23, 23 are provided when the upper molds 3, 3a are released from the mold.
The upper piece 9 pushes the upper surface of the molded body W against the upper surface of the molded body W by a ..., and the upper piece geta 8 is raised while the pins 31 and 31a ... With the upper surface of the molded body W pressed by the lower surface of the upper piece 9, the pins 31, 31a
... can be pulled out, and therefore, the shape of the molded body W can be maintained by the contact of the upper piece 9 with respect to the upper surface direction of the molded body W, and the pins 31, 31a in the molded body W, the spacers S, Sa ... It is possible to prevent misalignment between the upper lacking portion and the corner portion of the surface, and thus prevent defective products from being produced and to manufacture with high yield.

Further, since the pins 31, 31a ... Are attached to the upper piece geta 8 of the upper molds 3, 3a .. Secondly, it is possible to prevent the surface side from being damaged during the transportation after the mold and does not need a reversing device. Secondly, when the upper layer powder raw material M is filled, the lower layer powder raw material M is placed in the cavities 4, 4a. Further, the powder material M of the upper layer can be filled in the cavities 4, 4a in a well-distributed state by the step portions 47, 47a ... And the upper die immediately after the powder material M of the upper layer is filled. Since the powder raw material M is compression-molded by 3, 3a ..., the compression molding can be performed without being affected by mechanical vibrations other than the compression-molding work, and therefore a clear pattern appears on the surface of the paving stone block B. It is possible to prevent uneven firing shrinkage distortion.

Further, the separating members 23, 23a ... Are replaced by compression springs 24, 24.
Since the mechanical separation members 23, 23a are used to bring the upper piece geta 8 and the upper piece 9 into contact with each other, the vertical movement of the upper dies 3, 3a and the expansion and contraction of the spacing members 23, 23a are synchronized. In the compression springs 24, 24a, ..., the upper piece geta 8 and the upper piece 9 can be naturally brought into contact with and separated from each other by the elastic force at the time of pressing and demolding. The maximum effect can be achieved with the configuration.

Further, air blowout holes 35, 35 are formed on the lower surface of the upper piece geta 8.
Since a ... Is provided, even if the powder material M scattered in the air enters the gap 10 between the upper piece geta 8 and the upper piece 9, the air hole 3
3, 33a ... through the air introduction holes 34, 34a ... And the air blowing holes 35, 35a.
Since the powder material M can be forcibly removed from the gap portion 10, the upper piece geta 8 and the upper piece 9 can be prevented from being damaged, and the forming accuracy of the formed body W can be maintained constant.

Further, the upper dies 3, 3a ... Are attached to the vertical and horizontal frames 38, 38a.
, 39, 39a ... and the horizontal frames 38, 38a
In the lower part of the upper piece geta 8, a blow-in port 41, 41a ... and a suction port 42,
Since 42a ... Is provided, the same effect as described above can be obtained, and the gap material 10 is formed into a substantially sealed state by the vertical and horizontal frames 38, 38a, 39, 39a. Can be prevented as much as possible, and the powder material M can be eliminated even if the pressure of the pressurizing air is low by sucking and discharging the air press-fitted from the air inlets 41, 41a. The practical effect is great, as the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a paving stone block molding die according to the present invention.

FIG. 2 is a side view showing a state in which an upper die is attached to an upper piece plate.

FIG. 3 is a bottom view of FIG.

FIG. 4 is an enlarged cross-sectional view of a main part of FIG.

FIG. 5 is a plan view of a mold frame.

FIG. 6 is a bottom view of the upper piece plate.

FIG. 7 is a bottom view of the upper piece geta.

FIG. 8 is a side view of the same.

FIG. 9 is a plan view of an upper piece.

FIG. 10 is an enlarged cross-sectional view of a main part of a mold in which a powder material is filled in a cavity.

FIG. 11 is an enlarged cross-sectional view of a main part of the mold at the start of press molding.

FIG. 12 is an enlarged cross-sectional view of a main part of a mold during press molding.

FIG. 13 is an enlarged cross-sectional view of a main part of the die in a state where the pin insertion portion is in a pre-rising state at the time of demolding.

FIG. 14 is an enlarged cross-sectional view of a main part of a mold when press molding is completed.

FIG. 15 is a perspective view of a paving stone block.

FIG. 16 is a cross-sectional view of an upper mold provided with a material forced-discharging means.

FIG. 17 is a bottom view of the upper mold of another embodiment.

FIG. 18 is an enlarged cross-sectional view of the main parts of FIG.

FIG. 19 is a plan view showing a laid state of a paving stone block.

[Explanation of symbols]

 3, 3a ... Upper mold 4, 4a ... Cavity 8 Upper piece geta 9 Upper piece 23, 23a ... Separation member 24, 24a ... Compression spring 31, 31a ... Pin 32 Insertion portion 35, 35a ... Air blowout hole 38, 38a Horizontal frame 39, 39a… Vertical frame 41, 41a… Blow-in port 42, 42a… Suction port 50, 50a… Trapezoidal groove

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shuji Terai 1-9-13 Arai-cho, Kariya city, Aichi prefecture

Claims (4)

[Claims] 1. An upper die for molding the surface of a molded body is disposed on the lower surface of an upper piece plate that is controlled to move up and down, a mold frame is disposed below the upper mold, and the upper mold is adapted to the mold frame. At the position, open the cavity for filling the raw material, and attach the lower mold to the upper surface of the lower piece base that is configured to move up and down relative to the mold frame, and set the paving stone block on the inner wall surface that forms the cavity. In a die having a trapezoidal groove forming a spacer, the upper die is divided into an upper piece geta and an upper piece, and the upper piece is attached to and detachable from the upper piece geta so that the upper piece geta and the upper piece can be separated from each other. An expandable and retractable separating member is provided, a pin is provided at a position corresponding to the trapezoidal groove on the upper piece geta peripheral surface, and the insertion portion on the tip end side of the pin can be freely inserted into and removed from the trapezoidal groove. Mold for paving stone blocks characterized by. 2. The paving stone block molding die according to claim 1, wherein the separating member is a compression spring. 3. A paving stone block molding die according to claim 1 or 2, wherein an air blowout hole is provided on the lower surface of the upper piece geta. 4. The upper die is surrounded by a vertical and horizontal frame, and
3. The paving stone block molding die according to claim 1, wherein a blow-in port and a suction port are provided below the upper piece of the horizontal frame.