WO2022224828A1 - 切断方法および積層セラミック部品の製造方法 - Google Patents
切断方法および積層セラミック部品の製造方法 Download PDFInfo
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- WO2022224828A1 WO2022224828A1 PCT/JP2022/017198 JP2022017198W WO2022224828A1 WO 2022224828 A1 WO2022224828 A1 WO 2022224828A1 JP 2022017198 W JP2022017198 W JP 2022017198W WO 2022224828 A1 WO2022224828 A1 WO 2022224828A1
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- Prior art keywords
- cutting
- cut
- mother laminate
- cutting method
- blade
- Prior art date
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- 238000005520 cutting process Methods 0.000 title claims abstract description 204
- 239000000919 ceramic Substances 0.000 title claims description 69
- 238000000034 method Methods 0.000 title claims description 49
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000010410 layer Substances 0.000 claims description 45
- 239000011241 protective layer Substances 0.000 claims description 26
- 238000010304 firing Methods 0.000 claims description 16
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 5
- 239000002243 precursor Substances 0.000 description 25
- 239000003985 ceramic capacitor Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 10
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- 239000000463 material Substances 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 229910010293 ceramic material Inorganic materials 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
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- 238000005452 bending Methods 0.000 description 2
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- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
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- 238000010030 laminating Methods 0.000 description 2
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- 230000008018 melting Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
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- 238000005245 sintering Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
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- 229910017052 cobalt Inorganic materials 0.000 description 1
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- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
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- 239000000696 magnetic material Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000010944 silver (metal) Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
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- 230000003746 surface roughness Effects 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
- H01G13/003—Apparatus or processes for encapsulating capacitors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/14—Apparatus or processes for treating or working the shaped or preshaped articles for dividing shaped articles by cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
- B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
- B26D1/34—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut
- B26D1/38—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and coacting with a fixed blade or other fixed member
- B26D1/385—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and coacting with a fixed blade or other fixed member for thin material, e.g. for sheets, strips or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
Definitions
- the present disclosure relates to a cutting method and a method of manufacturing a laminated ceramic component.
- Patent Document 1 An example of conventional technology is described in Patent Document 1.
- a mother laminate in which ceramic green sheets and electrode layers are alternately laminated is placed on a pedestal, and a cutting blade having a straight blade edge is set in a direction in which the blade edge is advanced. While being inclined, the mother laminate is moved in a parallel direction along the arrangement surface of the pedestal to cut the mother laminate.
- a method for manufacturing a laminated ceramic component of the present disclosure includes the above cutting method, After forming a protective layer on the surface of the body part obtained by cutting, the body part is fired.
- FIG. 1 is a perspective view of an example of a laminated ceramic capacitor
- FIG. FIG. 3 is a diagram showing a base component before firing
- 1 is a perspective view showing a precursor of a base component
- FIG. FIG. 2 is a perspective view schematically showing a green sheet on which conductive paste is printed
- FIG. 2 is a perspective view schematically showing a laminated state of green sheets on which conductive paste is printed
- It is a perspective view of a mother laminate.
- FIG. 7 is a schematic diagram showing a state of cutting along a cutting line indicated by VII-VII in FIG. 6
- FIG. 4 is a schematic diagram of cutting as viewed from the direction of movement of the cutting blade. It is a schematic diagram which shows other embodiment of the cutting method.
- FIG. 3 is a diagram showing a base component before firing
- 1 is a perspective view showing a precursor of a base component
- FIG. FIG. 2 is a perspective view schematically showing a green sheet on which conductive paste is printed
- FIG. 4 is a perspective view showing a plurality of first rod-shaped bodies obtained by cutting;
- FIG. 4 is a perspective view showing a plurality of first rods rotated about their longitudinal axes;
- FIG. 4 is a perspective view showing a plurality of first rod-shaped bodies on which protective layers are formed;
- FIG. 4 is a perspective view showing a base component obtained by cutting a plurality of first rod-shaped bodies;
- FIG. 11 is a perspective view showing a plurality of first rod-shaped bodies in another example of the manufacturing method;
- FIG. 4 is a cross-sectional view showing a method of melting a thermoplastic resin sheet;
- FIG. 3 is a cross-sectional view showing a flat laminate block;
- FIG. 3 is a perspective view showing a flat laminate block;
- FIG. 3 is a perspective view showing a flat laminate block;
- FIG. 4 is a schematic diagram showing how a flat laminate block is cut;
- FIG. 4 is a schematic diagram of cutting as viewed from the direction of movement of the cutting blade.
- FIG. 4 is a perspective view showing a plurality of second rod-shaped bodies obtained by cutting;
- FIG. 4 is a perspective view showing a method of forming an assembly of parts;
- FIG. FIG. 4 is a perspective view schematically showing a component aggregate 27 after firing;
- Fig. 2 is a perspective view showing the base component 2 after barrel polishing;
- Patent Document 1 An example of the configuration that forms the basis of the present disclosure is described in Patent Document 1. 2. Description of the Related Art
- a multilayer ceramic capacitor As for laminated ceramic capacitors, products having a side length of 1 mm or less have become mainstream.
- multilayer ceramic capacitors in order to improve the capacitance per unit volume, it is possible to increase the area ratio of the internal electrode layers by thinning the dielectric between the internal electrode layers and by reducing the margin for protecting the inside. has become important.
- Patent Document 1 a mother laminate formed by laminating a ceramic green sheet and a conductive film is cut to cut out individual laminates with the conductive film exposed on the cut surface.
- a ceramic paste is applied to the cut surface of the cut laminate to provide a thin protective portion, which serves as a margin portion.
- press cutting which is the manufacturing method described in Patent Document 1
- cracks are generated toward the lower surface of the laminate at the final stage of cutting when the cutting blade approaches the lower surface, and microcracks are generated on the cut surface.
- the thickness of the cutting blade is reduced in order to reduce the influence of the cutting blade, the cutting blade escapes to the outside during cutting, and the cut surface is curved irregularly and cut obliquely.
- FIG. 1 is a perspective view of an example of a laminated ceramic capacitor.
- 2 is a perspective view schematically showing an element component of the multilayer ceramic capacitor of FIG. 1.
- FIG. FIG. 2 is a diagram showing a base component before firing. It should be noted that although the fired body part has shrunk due to firing, it has the same structure as the body part before fired, so it can be said that FIG. 2 shows the fired body part.
- 3 is a perspective view showing a precursor of the base component of FIG. 2; FIG. In the following, the precursor of the elemental part is sometimes referred to as an elemental precursor.
- a multilayer ceramic capacitor 1 has a base component 2 and external electrodes 3 .
- the base component 2 has a substantially rectangular parallelepiped shape, as shown in FIG.
- the element part 2 is made of dielectric ceramics 4 and has a plurality of internal electrode layers 5 connected to the external electrodes 3 .
- the external electrodes 3 are arranged on a pair of end surfaces of the base component 2 and extend around other adjacent surfaces.
- a plurality of internal electrode layers 5 extend inward from a pair of end surfaces of the base component 2 and are alternately laminated without being in contact with each other.
- the external electrode 3 is composed of a base layer connected to the base component 2 and a plated outer layer that facilitates solder mounting of the external wiring to the external electrode 3 .
- the base layer may be applied and baked onto the base component 2 after firing.
- the base layer may be disposed on the base component 2 before firing and fired at the same time as the base component 2 .
- the underlying layer and the plated outer layer may be multiple layers according to the required functions.
- the external electrode 3 may be configured to have an underlying layer and a conductive resin layer without having a plated outer layer.
- the base component 2 has a base precursor 13 and a protective layer 6, as shown in FIGS.
- the body precursor 13 has a substantially rectangular parallelepiped shape, as shown in FIG.
- the body precursor 13 has major surfaces 7 facing each other, end surfaces 8 facing each other, and side surfaces 9 facing each other.
- the internal electrode layers 5 are exposed on the end faces 8 and side faces 9 of the element precursor 13 .
- the protective layer 6 is arranged on the side surface 9 of the element precursor 13 .
- the protective layer 6 prevents an electrical short circuit between the internal electrode layer 5 exposed on one end surface 8 and the internal electrode layer 5 exposed on the other end surface 8 .
- the protective layer 6 physically protects the exposed portion of the internal electrode layer 5 on the side surface 9 of the element body precursor 13 .
- the protective layer 6 is applied last in making the base part 2 .
- the protective layer 6 protects the internal electrode layers 5 exposed on the side surfaces 9 of the body precursor 13 .
- the protective layer 6 may consist of a ceramic material. In this case, the protective layer 6 can have insulating properties and high mechanical strength.
- a ceramic material for the protective layer 6 is usually provided on the pre-firing body precursor 13 . In FIG. 2, the boundary between the element body precursor 13 and the protective layer 6 is indicated by a two-dot chain line, but the actual boundary does not appear clearly.
- the precursor base 13 which is its precursor, was also described. .
- Ceramic mixed powder obtained by adding an additive to BaTiO 3 which is a ceramic dielectric material is wet pulverized and mixed by a bead mill.
- a polyvinyl butyral-based binder, a plasticizer, and an organic solvent are added to and mixed with the pulverized and mixed slurry to prepare a ceramic slurry.
- a ceramic green sheet 10 is formed on the carrier film.
- the thickness of the ceramic green sheet 10 may be, for example, about 1 to 10 ⁇ m. As the thickness of the ceramic green sheet 10 is reduced, the capacitance of the laminated ceramic capacitor can be increased.
- the molding of the ceramic green sheets 10 is not limited to the die coater, and may be performed using, for example, a doctor blade coater or a gravure coater.
- a conductive paste that will become the internal electrode layers 5 is printed in a predetermined pattern on the ceramic green sheets 10 prepared above using a screen printing method.
- the printing of the conductive paste is not limited to the screen printing method, and may be performed using, for example, the gravure printing method.
- the conductive paste may contain metals such as Ni, Pd, Cu, Ag, or alloys thereof.
- the pattern of the internal electrode layer 5 may be, for example, a pattern such as an individual electrode pattern.
- the internal electrode layer 5 after drying is in a state in which nickel particles are dispersed in the organic binder. As long as the characteristics as a capacitor can be secured, the thinner the internal electrode layer 5 is, the more the internal defects due to internal stress can be prevented. In the case of a capacitor with a high number of laminations, the thickness of the internal electrode layers 5 may be, for example, 2.0 ⁇ m or less.
- a predetermined number of ceramic green sheets 10 having internal electrode layers 5 printed thereon are laminated on the predetermined number of laminated ceramic green sheets 10, and then a predetermined number of ceramic green sheets 10 are laminated. do.
- a predetermined number of ceramic green sheets 10 on which the internal electrode layers 5 are printed are laminated while shifting the pattern of the internal electrode layers 5 .
- the ceramic green sheets 10 are laminated on the support sheet.
- the support sheet may be an adhesive release sheet such as a weak adhesive sheet or a foamed release sheet that can be adhered and peeled.
- a laminate formed by laminating a plurality of ceramic green sheets 10 is pressed in the lamination direction to obtain an integrated mother laminate 11 as shown in FIG.
- the laminate can be pressed using, for example, a hydrostatic press.
- Internal electrode layers 5 are buried in layers in the mother laminate 11 with the ceramic green sheets 10 interposed therebetween.
- the mother laminate 11 is cut lengthwise and crosswise, it becomes the element precursor 13 shown in FIG.
- the main surface, end surfaces, and side surfaces of the mother laminate 11 correspond to the main surface 7, the end surfaces 8, and the side surfaces 9, respectively, of the body precursor 13, and are therefore denoted by the same reference numerals.
- the dashed lines shown in FIG. 6 are cutting lines that indicate positions to be cut. Using the cutting blade 14, the mother laminate 11 is cut along each cutting line. The mother laminate 11 is handled while placed on the support sheet 18, and cutting is also performed on the support sheet 18.
- FIG. 7 is a schematic diagram showing a state of cutting along the cutting line indicated by VII-VII in FIG.
- the mother laminate 11 is arranged on a pedestal 19, and the cutting blade 14 having the linear cutting edge 14a is moved in the mother laminate 11 with the cutting edge 14a inclined with respect to the traveling direction. Then, the mother laminate 11 is cut.
- the advancing direction of the cutting blade 14 is indicated by an arrow A in FIG.
- the mother laminate 11 is cut by moving the cutting blade 14 along the direction parallel to the placement surface of the pedestal 19 on which the mother laminate 11 is arranged.
- the advancing direction of the cutting blade 14 is the direction along the arrangement surface of the pedestal 19 .
- the cutting method of the present embodiment is not the conventional push-cut cutting method in which the cutting blade is moved toward the arrangement surface of the base 19, but the draw-cutting method in which the cutting blade 14 is moved along the arrangement surface of the base 19. It is a cutting method by Since the mother laminate 11 is normally flat plate-shaped, when the cutting edge 14 a is inclined with respect to the direction of travel, the cutting edge 14 a of the cutting blade 14 is inclined with respect to the main surface 7 of the mother laminate 11 . will be cut. The cutting edge 14a of the cutting blade 14 is inclined so that the upper side is positioned forward in the traveling direction of the cutting blade 14 and the lower side is positioned rearward in the traveling direction.
- the mother laminate 11 can be cut with a relatively weak force, and the stress on the cut surface can be reduced. This reduces deformation due to cutting and short-circuiting of the internal electrode layers 5 at the cut surface.
- the ceramic green sheets 10 are composed of a resin binder that can be cut by the cutting blade 14 and ceramic particles scattered therein that cannot be cut by the cutting blade 14.
- the internal electrode layers 5 are also the same. Or analogously, it consists of a cuttable resin binder and non-cuttable metal particles.
- the cutting edge 14a of the cutting blade 14 is perpendicular to the traveling direction. In the uncut portion located in front of the cutting edge 14a advancing through the ceramic green sheet 10, there is a sparse region where the resin binder spread by the thickness of the cutting blade 14 extends and the ceramic particles become sparse. When the cutting edge 14a hits the ceramic particles, the ceramic particles are pushed forward by the cutting edge 14 without being cut.
- the pressed ceramic particles are pushed into the front uncut portion, and the repulsive force acts as resistance to cutting.
- the cutting edge 14a of the cutting blade 14 is inclined with respect to the traveling direction, and the sparse regions where the particles are sparse are also inclined along the cutting edge 14a.
- the ceramic particles are pushed by the cutting blade 14 without being cut. It can escape, dissipating the repelling force by the ceramic particles and reducing the resistance to cutting.
- the internal electrode layers 5 are also the same as or similar to the ceramic green sheets 10 . With such a mechanism, the cutting method of the present embodiment can cut the mother laminate 11 with a force weaker than that of the conventional press cutting.
- the material of the cutting blade 14 for example, carbon steel containing silicon or manganese or cemented carbide obtained by sintering a mixture of tungsten carbide and cobalt can be used. Moreover, in order to increase hardness, bending strength and fracture toughness, it may further contain other components.
- the cutting blade 14 cuts the mother laminate 11 along one cutting line, then cuts along the next cutting line, and repeats this until cutting is completed along all the cutting lines. .
- the tip (tip) of the cutting blade 14 may slide on the placement surface of the pedestal 19, but if it is moved in the support sheet 18 as in this embodiment, the placement surface of the pedestal 19 may be damaged or the tip of the cutting blade 14 may be damaged. wear can be reduced.
- the angle (tilt angle) b between the cutting edge 14a of the cutting blade 14 and the traveling direction is, for example, 15° to 80°.
- the inclination angle b may be appropriately set according to the thickness and material of the mother laminate 11 .
- the tip of the cutting blade 14 may be sharpened, for example.
- the angle a of the tip of the cutting blade 14 when viewed from the side is, for example, 30° to 75°. If the tip angle of the cutting blade 14 is less than 30°, the cutting blade 14 becomes thin and must be thickened to ensure rigidity. If the tip angle of the cutting blade 14 is greater than 75°, the contact area between the cut surface and the blade surface increases during cutting, and the frictional force between the cut surface increases.
- the shape of the peak side of the cutting blade 14 is not particularly limited, and may be a curved shape or a shape that is part of a polygon.
- the thickness of the cutting blade 14 is desirably thinner, and the longer the cutting edge 14a, the better. In the case of drawing, cutting can be performed with a relatively weak force, so the thickness of the cutting blade 14 can be, for example, 100 ⁇ m or less.
- the cutting blade 14 may be single-edged or double-edged, but preferably double-edged. In the case of a single-edged blade, the flat side has a large contact area with the cut surface, so the frictional force with the cut surface increases. In the case of a double-edged blade, it is preferable to use a so-called clam blade, in which the cross section of the cutting blade bulges outward. By doing so, the contact area with the cut surface is small and the rigidity is improved.
- the pedestal 19 may have a built-in heater 20 .
- the mother laminate 11 placed on the pedestal 19 is heated by the heater 20, and the resin binder in the mother laminate 11 is softened. A smooth cut surface is obtained.
- FIG. 8 is a schematic diagram of the state of cutting as seen from the moving direction side of the cutting blade 14.
- FIG. 8 is a schematic diagram of the state of cutting as seen from the moving direction side of the cutting blade 14.
- the uncut portion of the mother laminate 11 may be clamped between the pedestal 19 and the pressing plate 21 and fixed.
- the surface of the pressing plate 21 in contact with the mother laminate 11 may be an uneven surface having a surface roughness Ra of 5 ⁇ m or more. Such an uneven surface can reliably fix the uncut portion.
- the pedestal 19 may be provided with a magnet.
- the magnet may be, for example, an electromagnet.
- the material of the cutting blade 14 is a magnetic material such as carbon steel containing silicon or manganese
- the tip of the cutting blade 14 is magnetically attracted to the pedestal 19, and bending of the cutting blade 14 during cutting can be prevented.
- the internal electrode layers 5 of the mother laminate 11 are made of a ferromagnetic material such as a nickel-containing material, the mother laminate 11 being cut can be magnetically attracted to the pedestal 19 and fixed.
- the above-described embodiment is a cutting method in which one cutting blade 14 is used to repeat cutting a plurality of times to cut along all the cutting lines of the mother laminate 11 .
- a plurality of cutting blades 14 are arranged at regular intervals in a direction perpendicular to the moving direction and held by a holding member, and cutting is performed by moving the holding member. As a result, a plurality of cutting operations can be performed simultaneously in one cutting operation.
- the plurality of arranged cutting blades 14 may be held by a holder 16, which is a holding member, at positions shifted in the moving direction.
- a holder 16 which is a holding member
- the cutting blades 14 are at the same position in the moving direction, the cut portion of the mother laminate 11 is subjected to force in opposite directions by the two cutting blades 14 during cutting. , is compressed. If the distance between the cutting blades 14 held by the holder 16 is small, the cutting blades 14 are greatly deformed by compression.
- the cutting blades 14 held by the holder 16 are all held in displaced positions.
- the positions of the adjacent cutting blades 14 need only be shifted in the moving direction. good too.
- a plurality of first rod-shaped bodies 12 are obtained by cutting the mother laminate 11 by the cutting method of the present embodiment.
- a cut surface of the first rod-shaped body 12 is a surface corresponding to the side surface 9 of the element body precursor 13, and the internal electrode layer 5 is exposed.
- cutting the mother laminate 11 to obtain the plurality of first rod-shaped bodies 12 may be referred to as first cutting.
- each of the plurality of first rod-shaped bodies 12 is rotated 90 degrees around the longitudinal axis so that the exposed cut surfaces of the internal electrode layers 5 face upward.
- the ceramic slurry can be applied to the cut surfaces of the plurality of first rod-shaped bodies 12 all at once. After drying the ceramic slurry, the ceramic slurry is also applied to the cut surface on the opposite side of the first rod-shaped body 12 all at once.
- the protective layer 6 can be formed by applying a ceramic slurry to the cut surface of each first rod-shaped body 12 .
- the ceramic slurry forming the protective layer 6 may have the same component as the ceramic green sheets 10 forming the mother laminate 11 .
- each first rod-shaped body 12 is cut in a direction orthogonal to the first cutting, thereby obtaining the base component 2 as shown in FIG.
- the external electrodes 3 are formed to manufacture the multilayer ceramic capacitor 1 .
- the firing temperature can be appropriately set according to the ceramic material contained in the ceramic green sheet 10 that will become the dielectric ceramics 4 and the metal material contained in the conductive paste that will become the internal electrode layer 5 .
- the firing temperature may be, for example, 1100-1250°C.
- the mother laminate 11 is cut by a first cutting using a cutting machine to obtain a plurality of first rod-shaped bodies 12 .
- the cutting method according to each of the embodiments described above may be used, or other cutting methods such as dicing cutting or press cutting may be used.
- the cutting direction in the first cutting is 90° different from that of the first rod-shaped body 12 described above, and the cut surface of the first rod-shaped body 12 of this example is different. is a surface corresponding to the end surface 8 of the element body precursor 13 . After cutting, a certain interval is provided between adjacent first rod-shaped bodies 12 .
- thermoplastic resin sheet 36 and a flat plate 22 are placed so as to cover the upper surfaces of the plurality of first rods 12 and heated under pressure.
- the resin sheet 36 is melted by heating and flows into the gaps between the first rods 12 .
- a frame-shaped or columnar spacer 25 is arranged on the surface of the pedestal 19 to define the distance between the pedestal 19 and the flat plate 22 .
- Get block 23. 16 is a sectional view of the flat laminate block 23
- FIG. 17 is a perspective view of the flat laminate block 23.
- the flat laminate block 23 is a flat block in which a plurality of first rod-shaped bodies 12, which are laminates, are aligned and fixed with resin.
- the flat laminate block 23 is cut using the cutting method of the present embodiment.
- the cutting here is performed in a direction perpendicular to the first cutting, and the cut surface corresponds to the side surface 9 of the element precursor 13 .
- the cutting edge 14a of the cutting blade 14 to be used has a linear shape, and the cutting blade 14 is cut with the cutting edge 14a inclined at an inclination angle b with respect to the direction of travel, in the same or similar manner as in the cutting method described above. move.
- the advancing direction of the cutting blade 14 is indicated by arrow A in FIG.
- the cutting edge 14a of the cutting blade 14 cuts the flat laminate block 23 with the cutting edge 14a being inclined with respect to the main surface.
- the inclination angle b is, for example, 15° to 80°.
- FIG. 19 is a schematic diagram of the state of cutting as seen from the moving direction side of the cutting blade 14.
- FIG. The vertical ends of the cutting blades 14 are fixed to holders 16, which are fixed members, with the cutting edges 14a inclined, and both holders 16 move synchronously.
- the holder 16 moves to cut the flat laminate block 23
- the cutting blade 14 is returned to the position before cutting, and the pusher 17 feeds the flat laminate block 23 by a predetermined distance to the holder 16 side, and then the next step. is cut.
- the flat laminate block 23 is a block fixed with the thermoplastic resin 15 , the force required for cutting is greater than that for cutting the mother laminate 11 . Since both ends of the cutting blade 14 in the vertical direction are fixed to the holder 16, the cutting blade 14 does not vibrate even when a relatively large force is required for cutting, resulting in smooth cutting with little deformation. surface is obtained. Further, during cutting, the uncut portion of the flat laminate block 23 may be clamped between the pedestal 19 and the pressing plate 21 and fixed. A heater 20 may be incorporated in the pedestal 19 .
- a plurality of second rod-shaped bodies 24 are obtained by cutting the flat laminate block 23 by the cutting method of this embodiment.
- a cut surface of the second rod-shaped body 24 corresponds to the side surface 9 of the element precursor 13 .
- the second rod-shaped body 24 has a structure in which the element body precursor 13 is connected with the thermoplastic resin 15 .
- each of the plurality of second rod-shaped bodies 24 is rotated 90 degrees around the longitudinal axis to align the cut surfaces where the internal electrode layers 5 are exposed upward.
- a plurality of the second rod-shaped bodies 24 are assembled to form a component assembly 27 .
- the jig 26 is moved horizontally from the outside of the gap in the left-right direction toward the center.
- the jig 26 is an L-shaped formwork, and the two jigs 26 position the plurality of second rod-shaped bodies 24 in the longitudinal direction and in the direction perpendicular to the longitudinal direction.
- a plate-like component assembly 27 is formed.
- the ceramic green sheets 10 that will serve as the protective layers 6 are arranged on the upper and lower surfaces of the assembly of parts 27 .
- the ceramic green sheets 10 may be arranged on both the upper and lower surfaces of the component assembly 27 at once. If the ceramic green sheets 10 do not have enough strength to handle by themselves, the ceramic green sheets 10 may be arranged on each side of the component assembly 27 instead of on both sides at once.
- each laminated ceramic part has the same or similar structure as the element part 2 in which the ceramic green sheet 10 serving as the protective layer 6 is arranged on the element precursor 13 shown in FIG.
- the assembly of parts 27 with the ceramic green sheets 10 is degreased and fired.
- the component assembly 27 is placed on a zirconia plate, the plate with the component assembly 27 placed thereon is placed in a degreasing furnace to remove the solvent and binder, and then fired in a high-temperature firing furnace.
- the firing temperature can be appropriately set according to the ceramic material contained in the ceramic green sheet 10 that will become the dielectric ceramics 4 and the metal material contained in the conductive paste that will become the internal electrode layer 5 .
- the firing temperature may be, for example, 1100-1250°C.
- FIG. 24 is a perspective view schematically showing the component assembly 27 after firing.
- the thermoplastic resin 15 surrounding the base component 2 is decomposed and burned away.
- gaps 31 are formed between the element parts 2 filled with the thermoplastic resin 15, and the element parts 2 composed of the protective layer 6 and the element precursor 13 are connected.
- a parting line 32 is formed in a portion of the protective layer 6 located in the gap 31 between the base parts 2 .
- the base component 2 is substantially divided into individual pieces.
- the element parts 2 shrink during the sintering process, and the space between the element parts 2 widens, so that the sintered protective layer 6 is cracked at thin portions between the element parts 2, and the parting lines 32 are formed. is formed.
- the fired body component 2 is subjected to barrel polishing.
- Barrel polishing is performed for the purpose of removing corners and burrs of the base component 2, and a known barrel polishing method can be used.
- the base component 2 and the polishing material separated by the dividing line 32 are placed in a pot containing water and rotated to perform polishing.
- FIG. 25 is a perspective view showing the base component 2 after barrel polishing. As shown in FIG. 25, in the base component 2 after barrel polishing, burrs on the protective layer 6 are removed and the corners of the base component 2 are rounded.
- the base component 2 can be manufactured as described above. Furthermore, the multilayer ceramic capacitor 1 can be manufactured by forming the external electrodes 3 on the element component 2 .
- a mother laminate in which ceramic green sheets and electrode layers are alternately laminated is placed on a pedestal, and a cutting blade having a straight blade edge is set in a direction in which the blade edge is advanced. While being inclined, the mother laminate is moved in a parallel direction along the arrangement surface of the pedestal to cut the mother laminate.
- the manufacturing method of the laminated ceramic component of the present disclosure includes the above-described cutting method, and after forming a protective layer on the surface of the element body part obtained by cutting, the element body part is fired.
- the mother laminate can be cut with a relatively weak force, and the stress on the cut surface can be reduced. This reduces deformation due to cutting and short-circuiting of the electrode layer at the cut surface.
- the yield is improved.
- each embodiment is not limited to that embodiment, and may be used in combination. Further, for example, a ceramic green sheet serving as a protective layer or a plate-like assembly provided with ceramic slurry may be cut before firing, or the plate-like assembly may be washed after polishing. Thus, changing the processing conditions of each embodiment or adding a new step to each embodiment does not affect the gist of the present disclosure.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Inorganic Chemistry (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Ceramic Capacitors (AREA)
Abstract
Description
切断によって得られた素体部品の表面に保護層を形成したのち、素体部品を焼成する。
2 素体部品
3 外部電極
4 誘電体セラミックス
5 内部電極層
6 保護層
7 主面
8 端面
9 側面
10 セラミックグリーンシート
11 母積層体
12 第一棒状体
13 素体前駆体
14 切断刃
14a 刃先
15 熱可塑性樹脂
16 ホルダー
17 プッシャー
18 台座
18 支持シート
19 台座
20 ヒーター
21 板
22 平板
23 平板状積層体ブロック
24 第二棒状体
25 スペーサ
26 冶具
27 部品集合体
31 空隙
32 分割ライン
36 樹脂シート
Claims (10)
- セラミックグリーンシートと電極層とが交互に積層された母積層体を台座の上に配置し、直線状の刃先を有する切断刃を、前記刃先が進行方向に対して傾斜した状態で前記母積層体中を前記台座の配置面に沿って平行方向に移動させて前記母積層体を切断する切断方法。
- 前記母積層体の未切断の部分を、前記台座と押さえ板とで挟持して切断を行う、請求項1記載の切断方法。
- 前記母積層体が加熱された状態で切断を行う、請求項1または2に記載の切断方法。
- 前記切断刃の先端が尖がり形状を有している請求項1~3のいずれか1つに記載の切断方法。
- 前記台座に磁石を有している請求項1~4のいずれか1つに記載の切断方法。
- 前記切断刃は、移動方向に直交する方向に一定間隔で複数配列されて保持部材に位置しており、前記保持部材を移動させて切断を行う、請求項1~5のいずれか1つに記載の切断方法。
- 複数配列された前記切断刃は、移動方向においてずれた位置で前記保持部材に位置している、請求項6記載の切断方法。
- 前記切断刃の上下方向端部がそれぞれ固定部材に固定されており、両固定部材が同期して移動する請求項1~5のいずれか1つに記載の切断方法。
- 前記母積層体は、複数の積層体同士が向きを揃えて樹脂で固定された平板状である、請求項1~8のいずれか1つに記載の切断方法。
- 請求項1~9のいずれか1つに記載の切断方法を含み、
切断によって得られた素体部品の表面に保護層を形成したのち、素体部品を焼成する、積層セラミック部品の製造方法。
Priority Applications (3)
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US18/556,012 US20240198558A1 (en) | 2021-04-23 | 2022-04-06 | Cutting method and method for manufacturing multilayer ceramic component |
KR1020237034041A KR20230153458A (ko) | 2021-04-23 | 2022-04-06 | 절단 방법 및 적층 세라믹 부품의 제조 방법 |
JP2023516434A JPWO2022224828A1 (ja) | 2021-04-23 | 2022-04-06 |
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JP2021073688 | 2021-04-23 |
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WO2022224828A1 true WO2022224828A1 (ja) | 2022-10-27 |
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PCT/JP2022/017198 WO2022224828A1 (ja) | 2021-04-23 | 2022-04-06 | 切断方法および積層セラミック部品の製造方法 |
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US (1) | US20240198558A1 (ja) |
JP (1) | JPWO2022224828A1 (ja) |
KR (1) | KR20230153458A (ja) |
WO (1) | WO2022224828A1 (ja) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53146158A (en) * | 1977-05-25 | 1978-12-19 | Matsushita Electric Ind Co Ltd | Manufacturing method of laminated capacitor element |
JP2000263535A (ja) * | 1999-03-11 | 2000-09-26 | Murata Mfg Co Ltd | グリーンシートの切断方法 |
JP2002270460A (ja) * | 2001-03-09 | 2002-09-20 | Taiyo Yuden Co Ltd | 積層セラミック電子部品の製造方法 |
JP2003045738A (ja) * | 2001-08-02 | 2003-02-14 | Matsushita Electric Ind Co Ltd | セラミック電子部品の製造方法 |
JP2005332926A (ja) * | 2004-05-19 | 2005-12-02 | Murata Mfg Co Ltd | 積層セラミック電子部品の製造方法 |
JP2019009266A (ja) * | 2017-06-23 | 2019-01-17 | 株式会社村田製作所 | 積層セラミック電子部品の製造方法、及び、積層セラミック電子部品 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5590054B2 (ja) | 2012-02-07 | 2014-09-17 | 株式会社村田製作所 | 積層セラミック電子部品の製造方法 |
-
2022
- 2022-04-06 JP JP2023516434A patent/JPWO2022224828A1/ja active Pending
- 2022-04-06 KR KR1020237034041A patent/KR20230153458A/ko unknown
- 2022-04-06 US US18/556,012 patent/US20240198558A1/en active Pending
- 2022-04-06 WO PCT/JP2022/017198 patent/WO2022224828A1/ja active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53146158A (en) * | 1977-05-25 | 1978-12-19 | Matsushita Electric Ind Co Ltd | Manufacturing method of laminated capacitor element |
JP2000263535A (ja) * | 1999-03-11 | 2000-09-26 | Murata Mfg Co Ltd | グリーンシートの切断方法 |
JP2002270460A (ja) * | 2001-03-09 | 2002-09-20 | Taiyo Yuden Co Ltd | 積層セラミック電子部品の製造方法 |
JP2003045738A (ja) * | 2001-08-02 | 2003-02-14 | Matsushita Electric Ind Co Ltd | セラミック電子部品の製造方法 |
JP2005332926A (ja) * | 2004-05-19 | 2005-12-02 | Murata Mfg Co Ltd | 積層セラミック電子部品の製造方法 |
JP2019009266A (ja) * | 2017-06-23 | 2019-01-17 | 株式会社村田製作所 | 積層セラミック電子部品の製造方法、及び、積層セラミック電子部品 |
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US20240198558A1 (en) | 2024-06-20 |
KR20230153458A (ko) | 2023-11-06 |
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