JP2012086304A - Superabrasive wheel and compact, and its cutting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a superabrasive wheel enabling a cutting ability in a cutting process to be enhanced.SOLUTION: The superabrasive wheel 1 has: a disc-shaped superabrasive layer having a first side face 11 and a second side face 12 which face each other; and at least one of coating layers 21, 22 formed of nickel plating, which may be formed on the first and second side faces 11, 12, respectively. The superabrasive layer contains the plurality of superabrasives 31 which are dispersedly arranged, and an electrically conductive binder 10 which binds the superabrasives 31.

Description

  The present invention relates to a superabrasive wheel, a molded body, and a processing method thereof, and more specifically, cutting and grooving of rubber, resin, ceramics, a semi-sintered powder molded body, a powder molded body before sintering, and the like. The present invention relates to a superabrasive wheel used for processing or the like.

  Chip-shaped sintered bodies for mass production of ceramic capacitors used in electronic circuits and the like are mass-produced in the following steps.

  First, a metal powder and an organic binder are kneaded and formed into a sheet shape. Next, the sheet-like molded body is subjected to binder removal treatment and then sintered. Thereafter, the sheet-like sintered body is cut into a lattice shape by a superabrasive wheel or the like, and a chip-like sintered body is mass-produced.

  However, since the sintered body is a high-hardness and brittle material, there has been a problem that the superabrasive wheel is extremely worn, has a short life, and cracks occur during cutting.

  In order to avoid such problems, in recent years, a sheet-like powder compact is cut into chips before sintering, and the chip-shaped powder compact is heated to remove the binder. Thereafter, a method of sintering is also employed.

  In addition, when manufacturing small ceramic parts, the same manufacturing method as described above is employed. The binder used in these manufacturing processes is not particularly limited as long as it is a compound that can remove the binder by heating the molded body after molding. For example, polyvinyl alcohol (PVA), polyvinyl acetal, methyl cellulose, polyvinyl acetate Polyvinylbityral, waxes, polysaccharides and the like are used.

  Such a technique is disclosed in Japanese Patent Laid-Open No. 2002-316312 (Patent Document 1).

  As for the superabrasive wheel, for example, Japanese Patent Application Laid-Open No. 2009-6406 (Patent Document 2), Japanese Utility Model Publication No. 62-121061 (Patent Document 3), Japanese Utility Model Application Publication No. 62-178066 (Patent Document 4). Japanese Utility Model Laid-Open No. 62-195453 (Patent Document 5), Japanese Patent Application Laid-Open No. 3-281175 (Patent Document 6), Japanese Patent Application Laid-Open No. 2001-300853 (Patent Document 7), Japanese Patent Application Laid-Open No. 2001-300854 (Patent Document 5). Document 8), Japanese Patent Application Laid-Open No. 3-294182 (Patent Document 9) and Japanese Patent Application Laid-Open No. 59-110560 (Patent Document 10).

JP 2002-316312 A JP 2009-6406 A Japanese Utility Model Publication No. 62-121061 Japanese Utility Model Publication No. 62-178066 Japanese Utility Model Publication No. 62-195453 JP-A-3-281175 JP 2001-300853 A Japanese Patent Laid-Open No. 2001-300854 JP-A-3-294182 JP 59-110560 A

  However, since the sheet-like powder molded body to be cut has not been subjected to binder removal before the cutting process, the powder molded body and the chips scattered during cutting also contain an adhesive binder. ing. This chip not only adheres to the side surface of the superabrasive wheel and lowers the sharpness, but also roughens the surface of the cut surface.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a superabrasive wheel having a good cutting performance, a molded body, and a processing method thereof.

  A superabrasive wheel according to the present invention comprises a disk-shaped superabrasive layer having first and second side surfaces facing each other, and a coating comprising nickel plating provided on at least one of the first and second side surfaces The superabrasive grain layer includes a plurality of superabrasive grains arranged in a dispersed manner and a conductive binder that bonds the superabrasive grains.

  In the superabrasive wheel configured in this way, since the superabrasive layer is covered with the coating layer, the protrusion of the superabrasive grain on the surface of the superabrasive wheel is suppressed, and the chip adheres to the surface. Can be suppressed.

  Preferably, the superabrasive layer has a width in the radial direction, and the coating layer covers from the outer peripheral edge of the superabrasive layer to a portion having a width of 1/3 or more of the width of the superabrasive layer.

Preferably, the thickness of the coating layer is equal to or less than the average particle diameter of the superabrasive grains.
Preferably, the coating layer is formed by an electroless nickel plating method.

  Preferably, the surface of the coating layer has a satin finish and the surface roughness is 0.1 μmRa or more and 5 μmRa or less.

  Preferably, it is used for cutting or grooving of a semi-sintered powder compact or a powder compact before sintering.

  Preferably, the outer peripheral portion of the superabrasive grain layer is provided with a notch groove that opens to the first and second side surfaces and the outer peripheral surface.

  The processing method of the molded body according to the present invention performs cutting and grooving of a semi-sintered powder molded body or a powder molded body before sintering using any of the above superabrasive wheels.

  The molded body according to the present invention is processed using the above method.

It is a front view of the superabrasive wheel according to Embodiment 1 of the present invention. It is the side view of the superabrasive wheel seen from the direction shown by the arrow II in FIG. It is sectional drawing along the III-III line in FIG. It is an enlarged view along the arrow IV-IV line in FIG. It is sectional drawing which expands and shows the part enclosed by V in FIG. It is sectional drawing along the VI-VI line in FIG. It is sectional drawing of the superabrasive wheel according to Embodiment 2 of this invention. It is a front view of the superabrasive wheel according to Embodiment 3 of the present invention. It is the photograph which expands 100 times and shows the protrusion state of the abrasive grain of the electroformed blade side of a comparative product. It is the photograph which expands 1000 times and shows the protrusion state of the abrasive grain of the electroformed blade side of a comparative product. It is the photograph which expands 100 times and shows the protrusion state of the abrasive grain of the electroformed blade side surface of this invention product. It is the photograph which expands 1000 times and shows the protrusion state of the abrasive grain of the electroformed blade side surface of this invention product. It is the photograph which expands 100 times and shows the welding state of the chip in the part with the electroformed blade side surface of a comparative product. It is the photograph which expands 100 times and shows the welding state of the chip in another part of the electroformed blade side surface of a comparative product.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated. In addition, the embodiments can be combined.

(Embodiment 1)
1 is a front view of a superabrasive wheel according to Embodiment 1 of the present invention, FIG. 2 is a side view of the superabrasive wheel viewed from the direction indicated by arrow II in FIG. 1, and FIG. 1 is a cross-sectional view taken along line III-III in FIG. 1, and FIG. 4 is an enlarged view taken along line IV-IV in FIG. With reference to FIGS. 1 to 4, a slit 2 extending in the radial direction is formed on the outer periphery of the superabrasive wheel 1. A space between adjacent slits 2 is a blade portion 3. A hole 19 penetrating the superabrasive wheel 1 is provided at the center of the disc-shaped superabrasive wheel 1.

  FIG. 5 is an enlarged cross-sectional view of a portion surrounded by V in FIG. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. Referring to FIGS. 5 and 6, superabrasive wheel 1 includes a disc-shaped superabrasive layer 40 having first and second side surfaces 11 and 12 facing each other, and first and second side surfaces 11 and 12. 12, and coating layers 21 and 22 made of nickel plating provided on at least one of them. The superabrasive grain layer 40 includes a plurality of superabrasive grains 31 arranged in a dispersed manner and a conductive binder 10 that binds the superabrasive grains 31.

  As the conductive bonding material 10, it is possible to apply metal bonds, nickel plating, resin bonds containing conductive fillers, vitrified bonds containing conductive fillers, and the like. The coating layers 21 and 22 made of nickel plating can apply both electrolytic nickel plating and electroless nickel plating. And it is preferable that thickness t1 of the coating layers 21 and 22 is below the average particle diameter of the superabrasive grain 31. FIG.

  Here, the average particle diameter refers to an average particle diameter measured with a laser diffraction particle size distribution analyzer SALD series manufactured by Shimadzu Corporation.

  In the case of particle size distribution, the corresponding particle diameter value is a continuous value, so after dividing into small sections, determine the representative particle diameter for each section and replace it with the jump value to calculate the average particle diameter . Further, the particle diameter section is based on a logarithmic scale. First, an average value on the logarithmic scale is obtained, and the result is returned to an average value having a normal unit of particle diameter.

Specifically, first, a particle size range (maximum particle size: x ₁ , minimum particle size: x _{n + 1} ) to be measured is divided into n, and each particle size interval is [x _j , x _{j + 1} ]. (J = 1, 2,... N). The division in this case is an equal division on a logarithmic scale. Based on the logarithmic scale, the representative particle diameter in each particle diameter section is calculated by the following formula.

(Log ₁₀ x _j + log ₁₀ x _{j + 1} ) / 2
Since the representative diameter is logarithmic, it is not a unit of particle diameter at this point. Further, when q _j (j = 1, 2,... N) is a relative particle amount (difference%) corresponding to the particle diameter interval [x _j , x _{j + 1} ] and the total of all the intervals is 100%, logarithm The average value μ on the scale is expressed by the following equation.

  Since μ is a numerical value on a logarithmic scale and does not have a unit as a particle diameter, 10 μ is calculated to return to the unit of the particle diameter.

  The 10th power of μ is displayed on the data sheet as an average value (average particle diameter) in the SALD series.

  Furthermore, it is preferable that the coating layers 21 and 22 are easily coated with an electroless nickel plating method because a uniform plating film can be easily obtained.

  Electrolytic nickel plating is also applicable, but in the case of electrolytic nickel plating, an electrode must be connected to the superabrasive wheel, which requires extra man-hours and increases the cost. The plating thickness of the corner part of this is likely to be thicker than other parts.

  Furthermore, it is preferable that the surfaces of the coating layers 21 and 22 have a satin finish and the surface roughness is 0.1 μmRa or more and 5 μmRa or less.

  Here, the satin finish is a finish that does not have metallic luster and cannot observe directional streaks when visually observed.

  Specifically, Ra defined in JIS B0601 is preferably 0.1 μmRa or more and 5 μmRa or less.

  In addition, it is more preferably 0.2 μmRa or more and 4 μmRa, and most preferably 0.2 μmRa or more and 3 μmRa or less.

  In order to make the surface roughness of the coating layers 21 and 22 within the range of 0.1 μmRa or more and 5 μmRa or less, the coating layers 21 and 22 are formed on the surface of the superabrasive layer 40, so the surface of the superabrasive layer 40 It is necessary to finish the roughness in the range of 0.1 μmRa to 5 μmRa in advance.

  The surface finish of the superabrasive grain layer 40 before forming the coating layers 21 and 22 is preferably finished by grinding, lapping, electric discharge machining, chemical machining, etc., more preferably lapping, electric discharge machining, It is finished so that it can be visually observed by chemical processing.

  The superabrasive wheel 1 has a feature that chips hardly adhere to the side surface, and it is possible to cut or grooving a workpiece containing a binder, for example, a semi-sintered powder formed body, a powder molded body before sintering, or the like. Even when used for processing, the sharpness is good over a long period of time, and a good cut surface can be obtained.

  A plurality of slits 2 are formed on the outer peripheral portion of the superabrasive grain layer as notch grooves that open to both side surfaces and the outer peripheral surface. And, it is most preferable that a plurality of slits 2 be formed when used for cutting or grooving of a semi-sintered powder molded body containing a binder and a powder molded body before sintering.

  According to the superabrasive wheel 1 according to the embodiment configured as described above, the chips do not adhere to the side surface of the wheel, so that it is long even when used for cutting a powder molded body containing a binder. Good sharpness is obtained over a period, and a good cut surface is obtained. Furthermore, since the coating layers 21 and 22 made of nickel plating are difficult to peel off from the superabrasive layer 40 and have excellent heat resistance, the performance is stable over a long period of time even under severe conditions such as dry processing. It is possible to demonstrate.

(Embodiment 2)
FIG. 7 is a cross-sectional view of a superabrasive wheel according to the second embodiment of the present invention. Referring to FIG. 7, in superabrasive wheel 1 according to the second embodiment of the present invention, superabrasive layer 40 has a width W1 in the radial direction. The coating layers 21 and 22 have a width W2 that is 1/3 or more of the width W1 of the superabrasive layer 40 from the outer peripheral end 18 of the superabrasive layer 40. That is, the coating layers 21 and 22 are coated from the outer periphery of the superabrasive layer 40 with a width of 1/3 or more of the radial width of the superabrasive layer 40. Since the superabrasive wheel 1 is used by being incorporated in the wheel flange, it is sufficient to ensure performance if the coating layers 21 and 22 are formed on the portion protruding from the wheel flange. Therefore, it is preferable that the superabrasive grain layer 40 is covered with a width of 1/3 or more of the radial width. In the case of a thin-blade superabrasive wheel in which the entire superabrasive wheel 1 is the superabrasive layer 40, it is more preferable to form the coating layers 21 and 22 on the entire side surface because the number of manufacturing steps is reduced. It is most preferable to form the coating layers 21 and 22 on both side surfaces because the number of manufacturing steps can be further reduced.

(Embodiment 3)
FIG. 8 is a front view of a superabrasive wheel according to the third embodiment of the present invention. Referring to FIG. 8, superabrasive wheel 1 according to the third embodiment has fewer blade parts 3 than superabrasive wheel 1 according to the first embodiment.

  A superabrasive wheel according to Example 1 of the present invention will be described with reference to FIGS. The superabrasive wheels of FIGS. 1 to 6 are also referred to as electroformed thin blade wheels.

  The electroformed thin blade wheel of Example 1 has a thin disk shape, and this electroformed thin blade wheel has diamond abrasive as superabrasive grains 31 in a metal plating phase (metal bonded phase) made of Ni constituting the binder 10. It has a thin disc shape with an outer diameter of 75 mm and a thickness of 0.3 mm formed by dispersing grains (particle size: 40/60 μm), and the whole is formed of the superabrasive layer 40. The diameter of the central hole 19 is 40 mm.

  On the outer peripheral portion of the superabrasive grain layer 40, notched grooves (slits 2) that open to both side surfaces and the outer peripheral surface are formed. The dimensions of the cutout groove are 1 mm in width, 3 mm in radius method depth, and formed so as to divide the outer periphery into 64 equal parts. The notch groove was formed by grinding. Further, electroless Ni plating is applied as the coating layers 21 and 22 over both sides. The thickness of one side of the electroless Ni plating is about 5 μm.

  The electroformed thin blade wheel of Example 1 was manufactured as follows. First, a thin disc-shaped superabrasive layer having an outer diameter of 76 mm and a thickness of 0.35 mm was obtained by dispersing diamond abrasive grains by a known electroforming wheel manufacturing method. Next, both surfaces were lapped by a double-sided lapping machine of a free abrasive grain method, and the thickness was finished to 0.3 mm. The surface roughness of the side surface at this stage was 1.8 μmRa. Next, electroless Ni plating was applied over the entire surface of the superabrasive grain layer by a known method. The thickness of the electroless Ni plating was about 5 μm. Next, the hole of the superabrasive layer was finished to an inner diameter of 40 mm with an internal grinder. Next, a notch groove was provided by grinding so that the width was 1 mm, the radius method depth was 3 mm, and the outer peripheral portion was equally divided into 64 parts. Finally, the outer periphery was truing-dressed with a cylindrical grinder to finish the outer diameter to 75 mm to complete the electroformed thin blade wheel of Example 1. The surface roughness of the electroless Ni plating after completion was 1.3 μmRa. The surface finish of the electroless Ni plating was finished in a satin state where there was no metallic luster visually and no directional streak could be confirmed.

  The ceramic powder compact (green compact) was cut using the electroformed thin blade of Example 1 to confirm the effect of the present invention. The formed body of the ceramic powder has a plate shape and a thickness of about 0.5 mm. When an electroformed thin blade wheel is attached to a precision cutting machine, the rotational speed is 15000 / min, the feed speed is 15 mm / min, and when dry cutting is performed, a good sharpness is exhibited, and almost no chips adhere to both sides of the electroformed thin blade wheel. In addition, the cut surface could satisfy the required quality.

Comparative Example 1

  On the other hand, as Comparative Example 1, when a ceramic powder compact was dry-cut under the same processing conditions as in Example 1 with an electroformed thin blade wheel not subjected to electroless Ni plating as coating layers 21 and 22 on both sides, From the beginning of the process, chips adhered to both side surfaces of the electroformed thin blade wheel, the sharpness decreased, the cut surface was rough, and the required quality could not be satisfied.

  The electroformed thin blade wheel of Comparative Example 1 was manufactured as follows. First, a thin disc-shaped superabrasive layer having an outer diameter of 76 mm and a thickness of 0.35 mm was obtained by dispersing diamond abrasive grains (particle size: 40/60 μm) by a known electroforming wheel manufacturing method. Next, both surfaces were lapped by a double-sided lapping machine of a free abrasive grain method, and the thickness was finished to 0.3 mm. The surface roughness of the side surface at this stage was 1.8 μmRa. Next, the hole of the superabrasive layer was finished to an inner diameter of 40 mm with an internal grinder. Next, a notch groove was provided by grinding so that the width was 1 mm, the radius method depth was 3 mm, and the outer peripheral portion was equally divided into 64 parts. Finally, the outer periphery was truing-dressed with a cylindrical grinder and finished to an outer diameter of 75 mm.

The surfaces of Comparative Example 1 (Comparative product) and Example (Product of the present invention) were observed.
FIG. 9 is a photograph showing the protruding state of the abrasive grains on the side surface of the comparative electroformed blade magnified 100 times. FIG. 10 is a photograph showing the protruding state of the abrasive grains on the side surface of the comparative electroformed blade magnified 1000 times. FIG. 11 is a photograph showing the protruding state of abrasive grains on the side surface of the electroformed blade of the product of the present invention at 100 times magnification. FIG. 12 is a photograph showing the protruding state of abrasive grains on the side surface of the electroformed blade of the product of the present invention at 1000 times magnification. FIG. 13 is a photograph showing a chip welding state at a portion on the side surface of the electroformed blade of the comparative product magnified 100 times. FIG. 14 is a photograph showing a chip welding state in another part of the side surface of the electroformed blade of the comparative product, enlarged 100 times.

  As shown in FIGS. 9 and 10, the superabrasive grains 31 protrude from the surface of the binder 10 in the comparative product, whereas the superabrasive grains 31 appear in the product of the present invention as shown in FIGS. It is covered with the coating layer 21, and the protruding amount of the superabrasive grains 31 is small and it can be seen that it is satin-finished.

  Moreover, as shown in FIG. 13 and FIG. 14, since the superabrasive grains 31 protrude in the comparative product, it can be seen that the chips 200 are welded to the surface.

  A superabrasive wheel according to Example 2 of the present invention will be described with reference to FIGS. The superabrasive wheel of Example 2 is also called a metal bond thin blade wheel.

  The metal bond thin blade wheel of Example 2 has a thin disk shape, and this metal bond thin blade wheel is used as a superabrasive grain 31 in a sintered alloy (90 mass% Cu-10 mass% Sn) as a binder 10. The diamond abrasive grains (particle size: 40/60 μm) are dispersed to form a thin disc having an outer diameter of 75 mm and a thickness of 0.3 mm, and the whole is formed of the superabrasive layer 40. The diameter of the central hole 19 is 40 mm.

  On the outer peripheral portion of the superabrasive grain layer 40, notched grooves (slits 2) that open to both side surfaces and the outer peripheral surface are formed. The dimensions of the cutout groove are 1 mm in width, 3 mm in radius method depth, and formed so as to divide the outer periphery into 64 equal parts. The notch groove was formed by electric discharge machining. Further, electroless Ni plating is applied to the entire side surfaces. The thickness of one side of the electroless Ni plating is about 5 μm.

  The metal bond thin blade wheel of Example 2 was manufactured as follows. First, a thin disc-shaped superabrasive layer having an outer diameter of 76 mm and a thickness of 0.35 mm was obtained by dispersing diamond abrasive grains by a known metal bond wheel manufacturing method. Next, both surfaces were lapped by a double-sided lapping machine of a free abrasive grain method, and the thickness was finished to 0.3 mm. The surface roughness of the side surface at this stage was 2.1 μmRa. Next, electroless Ni plating was applied over the entire surface of the superabrasive grain layer by a known method. The thickness of the electroless Ni plating was about 5 μm. Next, the hole of the superabrasive layer was finished to an inner diameter of 40 mm with an internal grinder. Next, a notch groove was provided by grinding so that the width was 1 mm, the radius method depth was 3 mm, and the outer peripheral portion was equally divided into 64 parts. Finally, the outer periphery was trued and dressed with a cylindrical grinder to finish the outer diameter to 75 mm, thereby completing the metal bond thin blade wheel of Example 1. The surface roughness of the electroless Ni plating after completion was 1.5 μmRa. The surface finish of the electroless Ni plating was finished in a satin state where there was no metallic luster visually and no directional streak could be confirmed.

  Using the metal bond thin blade wheel of Example 2, a ceramic powder compact (green compact) was cut to confirm the effect of the present invention. The formed body of the ceramic powder has a plate shape and a thickness of about 0.5 mm. When a metal bond thin blade wheel is attached to a precision cutting machine, the rotational speed is 15000 / min, the feed rate is 10 mm / min, and when dry cutting is performed, a good sharpness is exhibited, and the chips adhere to both sides of the metal bond thin blade wheel. In addition, the cut surface could satisfy the required quality.

Comparative Example 2

  On the other hand, when a ceramic powder compact was dry-cut under the same processing conditions as in Example 2 with a metal-bonded thin-blade wheel that was not electroless Ni-plated on both sides as Comparative Example 2, a metal-bonded thin blade from the beginning of processing Chips adhered to both sides of the wheel, resulting in poor sharpness, a rough cut surface, and the required quality could not be satisfied.

  In addition, the metal bond thin blade wheel of the comparative example 2 was manufactured as follows. First, a thin disc-shaped superabrasive layer having an outer diameter of 76 mm and a thickness of 0.35 mm was obtained by dispersing diamond abrasive grains (particle size: 40/60 μm) by a known metal bond wheel manufacturing method. Next, both surfaces were lapped by a double-sided lapping machine of a free abrasive grain method, and the thickness was finished to 0.3 mm. The surface roughness of the side surface at this stage was 2.1 μmRa. Next, the hole of the superabrasive layer was finished to an inner diameter of 40 mm with an internal grinder. Next, a notch groove was provided by grinding so that the width was 1 mm, the radius method depth was 3 mm, and the outer peripheral portion was equally divided into 64 parts. Finally, the outer periphery was truing-dressed with a cylindrical grinder and finished to an outer diameter of 75 mm.

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Superabrasive wheel, 2 slit, 3 blade part, 10 binder, 11 1st side surface, 12 2nd side surface, 18 outer peripheral surface, 19 holes, 21,22 coating layer, 31 superabrasive grain, 40 superabrasive layer 200 chips.

Claims (9)

A disc-shaped superabrasive layer having first and second sides facing each other;
A coating layer made of nickel plating provided on at least one of the first and second side surfaces,
The superabrasive layer is a superabrasive wheel including a plurality of superabrasive grains arranged in a dispersed manner and a conductive binder for binding the superabrasive grains. The superabrasive layer has a width in the radial direction,
2. The superabrasive wheel according to claim 1, wherein the coating layer covers from an outer peripheral end of the superabrasive layer to a portion having a width of 1/3 or more of the width of the superabrasive layer.   The superabrasive wheel according to claim 1 or 2, wherein a thickness of the coating layer is equal to or less than an average particle diameter of the superabrasive grains.   The superabrasive wheel according to any one of claims 1 to 3, wherein the coating layer is formed by an electroless nickel plating method.   The superabrasive wheel according to any one of claims 1 to 4, wherein the surface of the coating layer has a satin finish and has a surface roughness of 0.1 µmRa to 5 µmRa.   The superabrasive wheel according to any one of claims 1 to 5, which is used for cutting or grooving a semi-sintered powder compact or a powder compact before sintering.   The superabrasive grain according to any one of claims 1 to 6, wherein a notch groove that opens to the first and second side faces and the outer peripheral face is provided in an outer peripheral portion of the superabrasive grain layer. wheel.   The processing method of a molded object which uses the superabrasive wheel of any one of Claim 1 to 7 to perform cutting and grooving of a semi-sintered powder molded body or a powder molded body before sintering. .   The molded object processed using the method of Claim 8.