JP2012116117A - Roll molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll molding apparatus which can improve shaping property and mold releasability by hardly receiving the restriction about the control of a rugged pattern or other production condition while keeping high productivity.SOLUTION: The roll molding apparatus is configured to provide the roll mold 2 having the rugged pattern 1 on the outer circumferential surface and to form the rugged pattern 4 on the surface of a green sheet 3 by rotating the roll mold 2 to press the surface of the green sheet 3. The roll mold 2 is formed to be hollow and provided with numberless fine pores 5 communicating with the inside and the outside of the roll mold 2 on the outer circumferential surface of the roll mold 2. The roll mold 2 is formed to be controllable to exhaust after inspiring through the fine pores 5 of a part in contact with the green sheet 3 in the outer circumferential surface of the roll mold 2.

Description

  The present invention relates to a roll forming apparatus used to form a concavo-convex pattern on the surface of a green sheet.

  Conventionally, for inorganic plates used for exterior materials, etc., a green sheet is first produced using a ceramic molding material, and then a concavo-convex pattern is formed on the surface of the green sheet using a press molding apparatus, and then this is cured. Manufactured by curing.

  However, since the forming of the concavo-convex pattern by the press forming apparatus is usually performed intermittently, there is a problem that the forming tact becomes long and the productivity is lowered.

  Therefore, using a roll forming apparatus formed with a roll mold, while the long green sheet is conveyed in the longitudinal direction, the roll mold is rotated to press the surface of the green sheet, and an uneven pattern is formed on this surface. Forming continuously is performed (for example, refer patent document 1). By the way, the ceramic molding material for producing the green sheet is one that forms a concavo-convex pattern mainly by the material flowing along the concavo-convex pattern of the roll-type concavo-convex pattern, along the concavo-convex pattern of the roll-type concavo-convex pattern Various materials can be considered, such as those that form a concavo-convex pattern mainly due to compressive deformation of the material, and those that form a concavo-convex pattern due to combined flow and compression deformation of the material along the unevenness of the roll-type concavo-convex pattern. .

JP 2006-175807 A

  However, in the conventional roll forming apparatus, when an attempt is made to form a concave / convex pattern with a deep concave portion and a narrow concave portion width, a pattern chipping or a blurred pattern occurs, and sufficient shapeability cannot be obtained. There is. In this case, if the green sheet conveyance speed and the roll mold rotation speed are slowed to increase the molding time, the above uneven pattern may be formed, but the production that is an advantage of the roll molding apparatus Sex is sacrificed. Therefore, the use of the conventional roll forming apparatus is limited to the case of forming an uneven pattern in which the depth of the recess is shallow and the width of the recess is wide.

  Further, in the conventional roll forming apparatus, a release agent is sprayed on the outer peripheral surface of the roll mold in order to ensure the release property, but there is a problem that sufficient release property cannot be obtained only by this. That is, the releasability depends on conditions such as the roll-type material and its uneven pattern, the properties such as the moisture content of the green sheet, the ambient temperature and humidity, and the conditions are difficult to manage. Moreover, in this case, the concavo-convex pattern is limited to a simple pattern such as a wrinkle pattern in which the ceramic molding material hardly remains.

  The present invention has been made in view of the above points, and while maintaining high productivity, makes it difficult to be constrained in the management of uneven patterns and other production conditions, and improves shaping and releasability. An object of the present invention is to provide a roll forming apparatus capable of performing the above.

  The roll forming apparatus according to the present invention is formed with a roll mold having an uneven pattern on an outer peripheral surface, and forms the uneven pattern on the surface by rotating the roll mold and pressing the surface of the green sheet. In the roll forming apparatus, the roll mold is formed in a hollow shape, and innumerable fine holes communicating with the inside and outside of the roll mold are provided on the outer peripheral surface of the roll mold, and among the outer peripheral surfaces of the roll mold It is formed so as to be controllable so as to be exhausted after being sucked through a minute hole in a portion in contact with the green sheet.

  In the roll forming apparatus, the inside of the roll mold is radially divided into a plurality of small chambers around the rotation axis of the roll mold, and each of the small chambers can be controlled to be individually in an intake state or an exhaust state. Preferably it is formed.

  In the roll forming apparatus, a pipe connecting portion communicating with the inside and outside of each small chamber is provided on the side surface of the roll mold for each small chamber, and each pipe connecting portion is connected to a decompression pump or a pressure pump via a pipe. Preferably it is.

  In the roll forming apparatus, it is preferable that the pipe connecting portion is provided in the vicinity of the outer peripheral surface of the roll mold, and a strainer is provided in the pipe.

  In the roll forming apparatus, it is preferable that the small chamber that starts to come into contact with the green sheet is in an intake state, and the small chamber that starts to be separated from the green sheet is in an exhaust state.

  In the roll forming apparatus, it is preferable that the small chamber after being separated from the green sheet is formed to be controllable so as to be in a stronger exhaust state, and a waste receiving portion is provided to face the small chamber. .

  According to the present invention, it is possible to improve the formability and releasability by exhausting after inhaling through the fine hole of the portion of the outer peripheral surface of the roll mold that is in contact with the green sheet, As a result, while maintaining high productivity, it is possible to make it difficult to receive restrictions on the management of production patterns such as uneven patterns.

An example of the roll forming apparatus which concerns on this invention is shown, (a) is a schematic side view, (b) is a schematic perspective view of a roll type | mold. It shows a part of an example of the roll forming apparatus according to the present invention, (a) is a schematic front view, (b) is a schematic front sectional view showing a part of (a). The other example of the roll forming apparatus which concerns on this invention is shown, (a) is a schematic sectional drawing of a side surface, (b) is a schematic front view (partially fractured).

  Embodiments of the present invention will be described below.

  FIG. 1 shows an example of a roll forming apparatus according to the present invention. This roll forming apparatus is provided with a cylindrical roll mold 2. The roll mold 2 is formed in a hollow shape and has an uneven pattern 1 on the outer peripheral surface. The concavo-convex pattern 1 is obtained by inverting the concavo-convex pattern 4 formed on the green sheet 3 described later. The material of the roll mold 2, particularly the material of the outer peripheral surface, is not particularly limited as long as it is difficult to be deformed when pressed, such as metal, resin, and hard rubber. The type of the concavo-convex pattern 1 is not particularly limited, and for example, not only a concave portion having a shallow depth and a wide concave portion, but also a concave portion having a deep concave portion and a narrow concave portion can be appropriately selected. Can do. Thus, the increase in the choices of the uneven pattern 1 of the roll mold 2 makes it possible to produce an inorganic plate as a high-value-added product. Furthermore, innumerable fine holes 5 are uniformly provided on the outer peripheral surface of the roll die 2, and these fine holes 5 communicate with the inside and outside of the roll die 2. The hole diameter of the fine holes 5 is not particularly limited, but is preferably 0.1 to 1.0 mm, and the fine holes 5 are preferably provided in a grid pattern with a pitch of 1 to 20 mm. .

  Further, as shown in FIG. 1, the interior of the roll mold 2 is equally divided into a plurality of small chambers 7 radially by partition walls 14 around the rotation axis 6 of the roll mold 2. The number of the small chambers 7 of the roll mold 2 shown in FIG. 1 is 16, but is not limited to this. The diameter of the roll mold 2, the thickness of the green sheet 3, the decompression pump 10 and the pressurization pump 11 described later. It can be changed to the optimum number depending on the ability of

  Further, as shown in FIG. 1, a pipe connection portion 8 is provided for each small chamber 7 on the side surface of the roll mold 2, and these pipe connection portions 8 communicate with the inside and outside of each small chamber 7. As shown in FIG. 1, each pipe connection portion 8 is preferably provided close to the outer peripheral surface of the roll die 2 on the side surface of the roll die 2.

  Moreover, each piping connection part 8 is connected to the decompression pump 10 or the pressurization pump 11 via the piping 9, as shown to Fig.2 (a). Hereinafter, the path of the pipe 9 that connects each pipe connection part 8 and the decompression pump 10 is referred to as an intake path, and the path of the pipe 9 that connects each pipe connection part 8 and the pressurization pump 11 is referred to as an exhaust path. For convenience, FIG. 2 shows only the pipes 9 connected to some of the pipe connection portions 8.

  Here, the intake path and the exhaust path will be specifically described. As shown in FIG. 2, a roll shaft 15 extends coaxially with the rotary shaft 6 from the center of the side surface of the roll mold 2 so that the roll mold 2 and the roll shaft 15 can be freely rotated integrally. Is supported by a bearing 16. In the roll shaft 15, a negative pressure tank 17 and a positive pressure tank 18 are provided between the roll mold 2 and the bearing 16. The negative pressure tank 17 and the positive pressure tank 18 are fixed to the roll shaft 15 and can rotate with the roll shaft 15. And the 1st piping 9a is extended from each piping connection part 8, is branched in the middle, and is connected to the negative pressure tank 17 and the positive pressure tank 18, respectively. An intake path valve 19 is provided in the first pipe 9 a from the branch point to the negative pressure tank 17, and an exhaust path valve 20 is provided in the first pipe 9 a from the branch point to the positive pressure tank 18.

  Hereinafter, the intake path and the exhaust path will be described separately.

  First, the intake path will be described. As shown in FIG. 2B, a second pipe 9b (not shown in FIG. 2A) is extended from the negative pressure tank 17 and connected to a recess 21 provided at the end of the roll shaft 15. Yes. The recess 21 is opened along the end surface of the roll shaft 15 and is formed along the longitudinal direction of the roll shaft 15 so as to include the rotation shaft 6 that is the center of the roll shaft 15. A negative pressure chamber 22 is provided so as to close the opening of the recess 21. Since the negative pressure chamber 22 is fixed without being rotated, a sealing material 23 is provided at a position where the end surface of the roll shaft 15 and the negative pressure chamber 22 are in contact to ensure sealing. Further, as shown in FIG. 2A, a third pipe 9c is extended from the negative pressure chamber 22, and is branched and merged into a plurality on the way, and is connected to a decompression pump 10 such as a vacuum pump. A strainer 12 is provided in each of the third pipes 9 c from the branch point to the junction point, and replacement valves 24 are provided on both sides of each strainer 12.

  Next, the exhaust path will be described. As shown in FIG. 2B, a fourth pipe 9d (not shown in FIG. 2A) extends from the positive pressure tank 18 and is connected to one end of a cylindrical body 25 provided at the end of the roll shaft 15. Has been. The cylindrical body 25 is provided along the longitudinal direction of the roll shaft 15 so as to include the rotation shaft 6 that is the center of the roll shaft 15 in the recess 21. The other end of the cylindrical body 25 protrudes from the inside of the negative pressure chamber 22 to the outside, and a positive pressure chamber 26 is provided so as to close the other end of the cylindrical body 25. Although the cylindrical body 25 rotates together with the roll shaft 15, the positive pressure chamber 26 is fixed without rotating in the same manner as the negative pressure chamber 22. Therefore, the cylindrical body 25, the negative pressure chamber 22 and the positive pressure chamber 26 are fixed. A sealing material 27 is provided at a place where the contact is made to ensure sealing. Further, as shown in FIG. 2A, a fifth pipe 9 e is extended from the positive pressure chamber 26 and connected to the pressurizing pump 11.

  Then, the intake path valve 19 is opened, the exhaust path valve 20 is closed, the replacement valve 24 is opened, the first pipe 9a, the negative pressure tank 17, the second pipe 9b, the recess 21, the negative pressure chamber 22, the third By connecting the pipe 9c and operating the decompression pump 10 in this state, the small chamber 7 connected to the first pipe 9a can be brought into an intake state (negative pressure state). When such a small chamber 7 is brought into contact with the green sheet 3, the green sheet 3 is sucked through the fine holes 5 of the small chamber 7, thereby adsorbing the green sheet 3 to the outer peripheral surface of the roll mold 2 corresponding to the small chamber 7. In addition, the ceramic molding material constituting the green sheet 3 can be forced to flow or compressively deform along the irregularities of the irregular pattern 1 of the roll mold 2 described above. In this way, the formability can be improved. The strength of the negative pressure at this time is not particularly limited, but is preferably 0.01 to 0.099 MPa.

  Further, the intake path valve 19 is closed and the exhaust path valve 20 is opened, and the first pipe 9a, the positive pressure tank 18, the fourth pipe 9d, the cylinder 25, the positive pressure chamber 26, and the fifth pipe 9e are communicated. By operating the pressurizing pump 11 in the state, the small chamber 7 connected to the first pipe 9a can be brought into an exhaust state (positive pressure state). When the green sheet 3 is in contact with such a small chamber 7, the outer peripheral surface of the roll mold 2 corresponding to this small chamber 7 is blown out through the fine holes 5 of the small chamber 7 that has been exhausted as described above. Thus, the green sheet 3 can be removed. In this way, the releasability can be improved. The strength of the positive pressure at this time is not particularly limited, but is preferably 0.3 to 0.6 MPa.

  Further, by closing the intake passage valve 19 and the exhaust passage valve 20, the small chamber 7 connected to the first pipe 9a can be brought into a normal pressure state (atmospheric pressure state).

  As described above, it is preferable to form a roll forming device that can be controlled using a control device (not shown) such as a computer so that each of the small chambers 7 is individually in an intake state, an exhaust state, or a normal pressure state.

  Next, the green sheet 3 suitable for forming the uneven pattern 4 using the roll forming apparatus as described above will be described.

  First, a ceramic molding material used for producing the green sheet 3 will be described. The ceramic molding material preferably contains a hydraulic material, an oily substance, a lightweight aggregate and water.

  As the hydraulic material, a cement such as Portland cement, fly ash cement, blast furnace cement, alumina cement, high alumina cement, silica fume cement, blast furnace slag, or the like can be used. Only one kind of such a hydraulic material can be used, or a plurality of kinds can be mixed and used.

  The oily substance forms an inverse emulsion (W / O emulsion) with water. As the oily substance, a hydrophobic liquid substance is usually used. Specific examples of the oily substance include toluene, xylene, kerosene, styrene, divinylbenzene, methyl methacrylate, trimethylolpropane trimethacrylate, unsaturated polyester resin, and the like. Such an oily substance can be used alone or in combination of two or more. The content of the oily substance is preferably 5 to 10% by volume with respect to the total amount of the ceramic molding material.

  As a lightweight aggregate, a non-spherical inorganic aggregate, a spherical inorganic aggregate, a spherical organic aggregate, and other materials can be used.

  As the non-spherical inorganic aggregate, pearlite or the like can be used. The sphericity of the non-spherical inorganic aggregate is preferably 0.80 or less. The sphericity is obtained based on the microscopic image of the particle, based on the area of the projected cross section of the particle and the perimeter of the cross section [circumferential length of a perfect circle having the same area as the area of the particle projected cross section] / The value calculated by the equation [measured value of the perimeter of the particle projection cross section], and the average value of the values calculated for any 50 particles.

  A fly ash balloon etc. can be used as a spherical inorganic aggregate. The sphericity of the spherical inorganic aggregate is preferably 0.95 or more.

  As the spherical organic aggregate, hollow resin particles or the like can be used. Specific examples include organic microballoons such as phenol resin microballoons, vinylidene chloride resin microballoons, and urea resin microballoons. The spherical organic aggregate preferably has a sphericity of 0.97 or more.

  The content of the lightweight aggregate is appropriately adjusted according to the density of the lightweight aggregate so that the inorganic plate obtained from the ceramic molding material can be sufficiently reduced in weight. About the ceramics-type molding material containing a non-spherical or spherical inorganic aggregate, it is preferable that a non-spherical or spherical inorganic aggregate is 5-80 mass parts with respect to 100 mass parts of hydraulic materials. Moreover, about the ceramic molding material containing a spherical organic aggregate, it is preferable that a spherical organic aggregate is 0.1-1.3 mass part with respect to 100 mass parts of hydraulic materials.

  The ceramic molding material preferably further contains an emulsifier that contributes to the formation of a stable inverse emulsion structure. Specific examples of the emulsifier include nonionic surfactants such as sorbitan sesquiol, glycerol monostearate, sorbitan monooleate, diethylene glycol monostearate, sorbitan monostearate, and diglycerol monooleate, various anionic surfactants, cations And surface active agents. The emulsifier content is preferably 1 to 3% by volume with respect to the total amount of the ceramic molding material.

  The ceramic molding material may contain various reinforcing materials and additives. Specific examples of the reinforcing material include aggregates such as gravel, glass powder and alumina silicate, synthetic fibers such as polypropylene fiber, acrylic fiber, vinylon fiber and aramid fiber, and reinforcing fibers such as carbon fiber, glass fiber and pulp. It is done.

  The moisture content of the ceramic molding material is, for example, 25 to 60% by mass with respect to the solid content in the ceramic molding material.

  An example of a specific method for preparing a ceramic molding material will be described. First, an emulsifier (for example, coconut oil or oleic acid type emulsifier), a styrene monomer, water, a crosslinking agent such as trimethylolpropane trimethacrylate, or a polymerization initiator such as t-hexylperoxy-2-ethylhexalate is mixed. To prepare an inverse emulsion mixture. Next, the ceramic molding material can be prepared by mixing the inverse emulsion mixture, the hydraulic material, the lightweight aggregate, and the reinforcing fiber and adjusting the water content. The inverse emulsion mixture and other components can be mixed using, for example, a forced stirrer or a continuous mixer.

  And the green sheet 3 is producible by extruding the ceramic type molding material prepared as mentioned above to a sheet form using an extruder.

  Next, a method for forming the concavo-convex pattern 4 on the surface of the green sheet 3 using the roll forming apparatus will be described. As shown in FIG. 1A, while the green sheet 3 produced in a long shape is conveyed in the longitudinal direction using a conveying device (not shown), the roll mold 2 is rotated to press the surface of the green sheet 3 By doing so, the concavo-convex pattern 4 can be continuously formed on this surface. At this time, the air is sucked through the fine holes 5 in the portion of the outer peripheral surface of the roll mold 2 in contact with the green sheet 3 and then exhausted. In FIG. 1A, among the plurality of small chambers 7 of the roll mold 2 of the roll forming apparatus formed in such a controllable manner, the pipe connection portion 8 of the small chamber 7 that is in the intake state is painted black, and the exhausted state The pipe connection portion 8 of the small chamber 7 is hatched. The other small chambers 7 are in a normal pressure state. That is, the roll forming apparatus sets the small chamber 7 that starts to contact the green sheet 3 to the intake state, sets the small chamber 7 that starts to separate from the green sheet 3 to the exhaust state, and sets the small chamber 7 that has finished separating from the green sheet 3 to the normal pressure state. It is preferable to be formed so as to be controllable. In this way, by switching the small chamber 7 from the start of contact with the green sheet 3 until the separation from the green sheet 3 from the intake state to the exhaust state, shaping and mold release can be performed smoothly. Furthermore, since the interior of the roll mold 2 is partitioned into a plurality of small chambers 7, only the desired small chamber 7 can be in an intake state or an exhaust state, and the entire interior of the roll mold 2 needs to be in an intake state or an exhaust state. No energy consumption can be reduced.

  And according to the roll forming apparatus shown in FIG.1 and FIG.2, if the air is sucked through the fine holes 5 in the part of the outer peripheral surface of the roll mold 2 that is in contact with the green sheet 3, the uneven pattern 1 of the roll mold 2 is formed. Even if it is complicated, the ceramic molding material can be forced to flow or compressively deform along the unevenness of the uneven pattern 1 of the roll mold 2, and the shapeability can be improved. And if it exhausts after inhaling, even if the ceramic molding material penetrates deeply into the concave portion of the concavo-convex pattern 1 of the roll mold 2, it can be removed without causing pattern chipping or pattern blurring. Can be improved. As a result, the molding tact time can be shortened, and while maintaining high productivity, it is possible to make it difficult to receive restrictions on the management of the uneven pattern 1 and other production conditions.

  By the way, as shown in FIG. 1A, when the air is sucked through the minute hole 5 in the part of the outer peripheral surface of the roll mold 2 that is in contact with the green sheet 3, the waste of the green sheet 3 is introduced into the small chamber 7 from the minute hole 5. There is a risk of getting in and collecting. In such a case, as shown in FIG. 1, if the pipe connection portion 8 is provided close to the outer peripheral surface of the roll mold 2, the waste that has entered the small chamber 7 can be immediately guided to the pipe connection portion 8. It can be discharged from the pipe connection 8 into the first pipe 9a as it is. The debris can be captured by the strainer 12 of the third pipe 9c through the intake path shown in FIG. When some debris is trapped by the strainer 12, the replacement valves 24 on both sides of the strainer 12 are closed, the strainer 12 is removed, replaced with a new strainer 12 or a strainer 12 from which the debris has been washed away, and then the replacement valve 24 is opened again. What should I do? As shown in FIG. 2A, when the third pipe 9c is branched, the strainer 12 can be replaced one by one while continuing the roll forming without stopping the decompression pump 10.

  Further, there is a possibility that the residue of the green sheet 3 is clogged in the fine hole 5. In order to suppress this, as shown in FIG. 1 (a), a waste receiving portion 13 is provided facing the small chamber 7 after being separated from the green sheet 3, and the small chamber 7 is moved from the normal exhaust state. Also, the exhaust state may be made stronger. If the roll forming apparatus is formed so as to be controllable in this way, it is possible to suppress clogging of the fine holes 5 and blow off the clogs clogged in the fine holes 5 with high-pressure air. It is possible to prevent the residue from adhering to the green sheet 3 after molding. The strength of the positive pressure in this case is not particularly limited, but is preferably 0.3 to 0.6 MPa.

  FIG. 3 shows another example of the roll forming apparatus according to the present invention, and this roll forming apparatus is also provided with a cylindrical roll mold 2. The roll mold 2 is formed in a hollow shape and has an uneven pattern 1 on the outer peripheral surface. Furthermore, innumerable fine holes 5 are uniformly provided on the outer peripheral surface of the roll die 2, and these fine holes 5 communicate with the inside and outside of the roll die 2. The material of the roll mold 2, the type of the uneven pattern 1, the hole diameter of the fine holes 5, etc. are as described above.

  Further, as shown in FIG. 3B, a roll shaft 15 extends coaxially with the rotary shaft 6 from the center of the side surface of the roll die 2, and the roll die 2 and the roll shaft 15 can be freely rotated integrally. Thus, the end of the roll shaft 15 is pivotally supported by the bearing 16. Further, an inner cylinder 28 is provided coaxially with the rotary shaft 6 inside the roll shaft 15. The inner cylinder 28 is fixed so as not to rotate, and is divided into an intake pipe 29 and an exhaust pipe 30 along the longitudinal direction.

  Further, an intake chamber 31 and an exhaust chamber 32 are provided adjacent to each other inside the roll mold 2 as shown in FIG. The intake chamber 31 and the exhaust chamber 32 communicate with the intake pipe 29 and the exhaust pipe 30 of the inner cylinder 28, respectively, and are fixed so as not to rotate. The intake chamber 31 and the exhaust chamber 32 have arcuate surfaces 33 and 34 that extend along the inner surface of the roll mold 2, and the arcuate surfaces 33 and 34 are provided with a large number of through holes (not shown). ing. These through holes communicate with the inside and outside of the intake chamber 31 and the exhaust chamber 32, respectively. The diameter of the through holes is not particularly limited, but is preferably 0.2 to 2.0 mm, and the through holes are preferably provided in a lattice shape at a pitch of 1 to 20 mm. In particular, the diameter of the through hole in the exhaust chamber 32 is preferably larger than the diameter of the fine hole 5 in the roll mold 2. The reason is that all the air exhausted from the inside of the exhaust chamber 32 through the through hole to the outside may not be exhausted as it is from the minute hole 5 facing the arc surface 34 of the exhaust chamber 32, and some air However, there is a risk that the gas will move through the roll mold 2 through the clearance between the arc surface 34 of the exhaust chamber 32 and the inner surface of the roll mold 2 and be exhausted from the minute hole 5 that does not face the arc surface 34 of the exhaust chamber 32. Because. In order to suppress this, the circumference of the arc surface 33 of the intake chamber 31, the circumference of the arc surface 34 of the exhaust chamber 32, and the boundary between the intake chamber 31 and the exhaust chamber 32 are in elastic contact with the inner surface of the roll mold 2, respectively. A sheet-like or brush-like sealing material 35 is provided. The clearance between the arc surfaces 33 and 34 of the intake chamber 31 and the exhaust chamber 32 and the inner surface of the roll mold 2 is not particularly limited, but is preferably 0.5 to 2.0 mm.

  As shown in FIG. 3B, the intake pipe 29 of the inner cylinder 28 extending from the end surface of the roll shaft 15 branches and merges in the middle, and the decompression pump 10 such as a vacuum pump. It is connected to the. A strainer 12 is provided in each of the intake pipes 29 from the branch point to the merge point, and replacement valves 24 are provided on both sides of each strainer 12. Then, by operating the decompression pump 10 with the replacement valve 24 open, the intake chamber 31 can be brought into the intake state (negative pressure state), and the fine hole 5 of the roll mold 2 and the intake chamber 31 are penetrated. The air can be sucked through the hole, and is always sucked during roll forming. The negative pressure at this time is as described above.

  On the other hand, the exhaust pipe 30 in the inner cylinder 28 extending from the end face of the roll shaft 15 is connected to the pressurizing pump 11. And by operating the pressurization pump 11, the exhaust chamber 32 can be made into an exhaust state (positive pressure state), and it is always exhausting during roll forming. The strength of the positive pressure at this time is as described above.

  Next, a method for forming the concavo-convex pattern 4 on the surface of the green sheet 3 using the roll forming apparatus will be described. The ceramic molding material used for producing the green sheet 3 is as described above. As shown in FIG. 3 (a), while the green sheet 3 produced in a long shape is conveyed in the longitudinal direction using a conveying device (not shown), the roll mold 2 is rotated to press the surface of the green sheet 3. By doing so, the concavo-convex pattern 4 can be continuously formed on this surface. At this time, the air is sucked through the fine holes 5 in the portion of the outer peripheral surface of the roll mold 2 in contact with the green sheet 3 and then exhausted. Such intake and exhaust air is preliminarily arranged so that the arc surfaces 33 and 34 of the intake chamber 31 and the exhaust chamber 32 are located in the portion corresponding to the portion in contact with the green sheet 3 on the outer peripheral surface of the roll mold 2. This can be done by fixing the intake chamber 31 and the exhaust chamber 32. Thus, since the intake chamber 31 and the exhaust chamber 32 whose positions do not change even when the roll mold 2 rotates are always in the intake state and the exhaust state, respectively, shaping and mold release can be performed smoothly. . Furthermore, only the intake chamber 31 and the exhaust chamber 32 can be set to an intake state and an exhaust state, respectively, so that it is not necessary to set the entire interior of the roll mold 2 to an intake state or an exhaust state, and energy consumption can be reduced. Is.

  Then, according to the roll forming apparatus shown in FIG. 3, as in the roll forming apparatus shown in FIGS. 1 and 2, the air is sucked through the minute holes 5 in the portion of the outer peripheral surface of the roll mold 2 that is in contact with the green sheet 3. Then, even if the green sheet 3 is made of an incompressible ceramic molding material or the uneven pattern 1 of the roll mold 2 is complicated, the ceramic molding material is used as the uneven pattern 1 of the roll mold 2. It can be forced to flow along the unevenness of the film, and the shapeability can be improved. And if it exhausts after inhaling, even if the ceramic molding material penetrates deeply into the concave portion of the concavo-convex pattern 1 of the roll mold 2, it can be removed without causing pattern chipping or pattern blurring. Can be improved. As a result, the molding tact time can be shortened, and while maintaining high productivity, it is possible to make it difficult to receive restrictions on the management of the uneven pattern 1 and other production conditions.

DESCRIPTION OF SYMBOLS 1 Uneven pattern 2 Roll type 3 Green sheet 4 Uneven pattern 5 Fine hole 6 Rotating shaft 7 Small chamber 8 Piping connection part 9 Piping 10 Pressure reduction pump 11 Pressure pump 12 Strainer 13 Waste receiving part

Claims (6)

  In the roll forming apparatus formed with a roll mold having a concavo-convex pattern on the outer peripheral surface and forming the concavo-convex pattern on the surface by rotating the roll mold and pressing the surface of the green sheet, the roll mold Is formed in a hollow shape, and an innumerable fine hole communicating with the inside and outside of the roll mold is provided on the outer peripheral surface of the roll mold, and a portion of the outer peripheral surface of the roll mold that is in contact with the green sheet A roll forming apparatus, wherein the roll forming apparatus is controllable so as to be exhausted after being sucked through a fine hole.   The inside of the roll mold is divided into a plurality of small chambers radially about the rotation axis of the roll mold, and is configured to be controllable so that each small chamber is individually in an intake state or an exhaust state. The roll forming apparatus according to claim 1, wherein   A pipe connecting portion communicating with the inside and outside of each small chamber is provided for each of the small chambers on the side surface of the roll mold, and the pipe connecting portion is connected to a decompression pump or a pressure pump via a pipe. Item 3. A roll forming apparatus according to Item 2.   The roll forming apparatus according to claim 3, wherein the pipe connecting portion is provided in proximity to the outer peripheral surface of the roll mold, and a strainer is provided in the pipe.   5. The control unit is configured to be controllable so that a small chamber that starts to contact the green sheet is in an intake state and a small chamber that starts to be separated from the green sheet is in an exhaust state. The roll forming apparatus described in 1.   2. The control unit is configured to be controllable so that the small chamber after being separated from the green sheet is in a stronger exhaust state, and a waste receiving portion is provided to face the small chamber. The roll forming apparatus according to any one of 5.

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