JP2003062815A - Base molding method for ceramic ware material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base molding method of high accuracy and high efficiency in a base molding technique for ceramic ware equipped with a base having a relatively deep constricted part. SOLUTION: Since the movements of a first cutting tool 70 and a second cutting tool 74 are controlled by an electronic control unit 100, fine adjustment of a speed or free setting of a locus is possible, trouble such as center shift, cutting or the like is not generated and a high yield is realized. Rough cutting is applied in a first cutting process and the outside surface of a ceramic ware material 30 formed into a predetermined preparatory shape 32 is further subjected to finish cutting in a second cutting process. By this constitution, a time required in production is shortened as compared with a method for performing grinding only by one kind of a finish blade and since cutting is applied to the outside surface of the ceramic ware material, which is formed into the predetermined preparatory shape through the first cutting process, in the second cutting process, cutting resistance is reduced and a problem such as a fine split or the like is hard to generate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for forming a hill on a ceramic body provided with a hill having a relatively deep neck (radial recess).

[0002]

2. Description of the Related Art In the manufacturing process of bowl-shaped ceramics such as coffee cups having a ring-shaped hill (bottom) on the bottom, finish cutting is generally performed after the base material is dried and before firing. In the production of the bowl-shaped ceramics having the above-mentioned hill, two types of methods have been conventionally adopted as means for forming the hill. That is, using a cam type automatic cutting device attached to an automatic molding device, a method of forming a hill by cutting an annular part (a part that becomes a hill) at the bottom of a ceramic body, and a container-shaped main body part and a hill part This is a method of molding separately and bonding them with an adhesive or the like to mold a ceramic base having a hill. Regarding the production of ceramics with a hill having a relatively shallow constriction, a method using an automatic cutting device is generally used, and no problem has occurred, but regarding the production of ceramics with a hill having a relatively deep constriction. Had the following problems.

[0003]

That is, in the conventional method using the automatic cutting device, the cam mechanism is used to move the cutting tool when cutting a portion of the outer surface of the ceramic body which is to be a hill. Since it is not possible to freely set the tool path or finely adjust the speed, and since it takes time to replace the cutting tool, it is necessary to cut with one type of finishing blade, and if you try to cut quickly, the cutting resistance will increase. It is not practical because it causes problems such as smashing, and because there is no reproducibility in setting the cutting tool and setting the cutting speed, the work becomes complicated when changing the work. It was On the other hand, in the method of separately molding the container-shaped main body portion and the elevated portion and joining them with an adhesive or the like, in addition to the poor productivity as compared with the method using the automatic cutting device, there are defects such as misalignment or breakage. It was likely to occur and the yield was poor.
For this reason, regarding the platform forming technology of the ceramics provided with the platform having a comparatively deep constriction, the development of the technique for realizing the high platform forming with high accuracy and high efficiency has been required.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a highly precise and highly efficient molding technique for a ceramic hill having a hill having a relatively deep neck. An object is to provide a method for forming a platform.

[0005]

In order to achieve this object, the gist of the present invention is that the ceramic body before firing is rotated around its central axis and cut on the outer surface of the ceramic body. A method of forming a base of a ceramic body by cutting the outer surface by bringing a tool into contact with the base to form a base on the ceramic base, the movement of the ceramic base being controlled by an electronic controller to control the base of the ceramic base. A first cutting step of cutting the outer side surface into a predetermined preliminary shape, and a movement of the outer side surface of the ceramic base material having the predetermined preliminary shape formed by the first cutting step are controlled by an electronic control unit. And a second cutting step of cutting with a second cutting tool to form a hill on the ceramic body.

[0006]

According to the present invention, since the movement of the cutting tool is controlled by the electronic control unit, it is possible to finely adjust the speed and freely set the locus, and a defect such as misalignment or cutting occurs. No, the yield is improved. In addition, a rough cutting is performed in the first cutting step (rough cutting step), and the outer side surface of the ceramic body which has a predetermined preliminary shape is further formed into a second
By cutting in the cutting process (finishing cutting process), the time required for manufacturing can be shortened compared to the method of cutting with only one type of finishing blade, and a predetermined preliminary process can be performed by passing through the first cutting process. Since the shaped outer surface is cut in the second cutting step, the cutting resistance is small, and problems such as shavings are unlikely to occur. Further, since it is possible to provide reproducibility by electronic control with respect to the attachment of the cutting tool, the setting of the cutting speed, etc., the work for changing the work becomes simple. As described above, according to the present invention, it is possible to provide a high-accuracy and high-efficiency, high-plate forming method with respect to a high-plate forming technique for ceramics provided with a plate having a relatively deep neck.

[0007]

Further, preferably, in the first cutting step, while rotating the first cutting tool, which is a rotary cutting tool having an outer peripheral blade, around the axis thereof, the outer surface of the ceramic body is removed. The outer peripheral blade of the first cutting tool is used for cutting. By doing so, the outer surface having a predetermined shape can be quickly obtained prior to the second cutting step which is the finish cutting.

Further, preferably, the second cutting tool has a first axial direction which is a central axial direction of the ceramic body, a second axial direction perpendicular to the first axial direction, and the first axial direction. And a movable in a third axis direction that is perpendicular to the second axis direction. In the second cutting step, the cutting edge of the second cutting tool forms a predetermined right rake angle with respect to the ceramic body. As described above, a cutting step of cutting into a portion which becomes an end edge portion of a hill of the ceramic body, and the second cutting tool in the second axial direction and the third axial direction so that the rake angle is gradually reduced. And a finishing step of cutting while moving in the first axis direction along the finished shape of the ceramic body while moving. By doing this, when cutting the part that will become the edge of the hill that has hardened due to drying, the cutting resistance is kept low by taking a large rake angle, and the rake angle is gradually increased according to the progress of hardening. By cutting along the finished shape of the ceramic body while reducing the number, it is possible to quickly form a high-precision pedestal.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In the drawings used in the following description, the dimensional ratios of the respective parts are not necessarily drawn accurately.

FIG. 1 shows a comparison between (a) a ceramic porcelain 10 having a platform 12 having a relatively deep neck 14 and (b) a porcelain 20 having a platform 16 having a relatively shallow neck 14. It is a perspective view. According to the conventional technique as a means for forming these hills, a method for forming the hills by cutting a portion to be the hills on the outer surface of the ceramic body by using an automatic cutting device by a cam method attached to the automatic molding device. And the container-shaped main body part and the elevated part are formed separately and then joined by an adhesive or the like to form them (elevated mounting method)
Two methods have been adopted.

FIG. 2 is a view showing a conventional method of forming a plateau 12 having a relatively deep constriction 14 on a ceramic base material 30 before firing of the ceramic ware 10 by using an automatic cutting device. 2 (1) is a hill 1 which has been cut.
2 is a cross-sectional view showing a ceramic base material 30 before being molded by cutting it along a plane including a central axis thereof. In a method of forming a hill 12 by using an automatic cutting device, the ceramic base material 30 is attached to the automatic cutting device. The pedestal 12 is formed by rotating around its central axis and bringing the cutting tool into contact with the annular portion 18 formed on the bottom of the ceramic body 30 to form the platform 12. (2) of FIG. 2 is a cross-sectional view showing the ceramic body 30 on which the plate 12 is formed by cutting in this way and cut along a plane including the central axis thereof.

A plateau 1 of a ceramic base 30 having a plateau 16 having a relatively shallow constriction 14 as shown in FIG. 1 (b).
Regarding the molding of No. 6, even with the method using the above-described automatic cutting device, since the constriction 14 of the hill 16 is shallow and the cutting resistance is small, no problem occurs.
In forming the ceramic base 30 with the platform 12 having a relatively deep constriction 14, the cutting resistance becomes large, which causes problems such as smashing. Since it takes time to replace the cutting tool, one type of finishing blade is used. It had to be shaved and it was difficult to solve this problem. Further, in the conventional automatic cutting device, since the movement of the cutting tool depends on the cam mechanism, the trajectory of the cutting tool cannot be freely set or the speed cannot be delicately adjusted. Since there is no reproducibility in the settings, etc., there was a problem that the work would be complicated when changing the work, which was not practical.

Therefore, in the molding of the ceramic base 30 provided with the platform 12 having the relatively deep constriction 14, the platform 12 is provided by separately molding the container-shaped body 22 and the platform 24 and joining them together. A general method is to mold the ceramic body 30. FIG. 3A is a cross-sectional view of the container-shaped main body 22 and the elevated portion 24 before being integrally joined, taken along a plane including a common central axis, and is as shown in this drawing. For example, clay-like clay, which is a material for pottery, is applied to the flat surface portions 26 and 28 of the container-shaped main body portion 22 and the elevated portion 24 that are separately molded, and then the flat surface portions 26 and 28 are joined. Then, as shown in FIG. 3B, the ceramic base 30 provided with the elevated 12 is formed by drying. According to this method, since the platform 12 can be molded regardless of the depth of the constriction 14, it is possible to mold the platform 12 having the relatively deep constriction 14, but the container-shaped main body portion 22 and the platform portion 24. Since it takes a long time to join, there is a problem that productivity is poor as compared with the method using the above-mentioned automatic cutting device, and defects such as misalignment or breakage are likely to occur, resulting in poor yield.

In order to solve the problems of the prior art, in this embodiment, the ceramic body 30 before firing is rotated around its central axis and the cutting tool is brought into contact with the outer surface of the ceramic body 30. A method for forming a base of a ceramic base 30 by cutting the outer surface to form a base 12 on the ceramic base 30 by (a) using a first cutting tool 70 whose movement is controlled by an electronic control unit. A first cutting step of cutting the outer side surface of the ceramic base material 30 into a predetermined preliminary shape 32; and (b) the ceramic base material 30 having the predetermined preliminary shape 32 by the first cutting step.
The outer surface of the above is cut by the second cutting tool 74 whose movement is controlled by the electronic control unit to form the platform 12 on the ceramic body 30, and the platform 12 is formed on the ceramic body 30 by the second cutting process.

FIG. 4 shows a method of forming an elevated plate which is an embodiment of the present invention. FIG. 4A is a cross-sectional view showing the ceramic base material 30 before being cut by cutting it along a plane including the central axis thereof, and in this embodiment, before the second cutting step which is finish cutting. Then, this ceramic base material 30 is attached to a hill automatic molding device and rotated about its central axis, and the ceramic base material 3
By cutting the annular portion 18 formed at the bottom of 0 using the first cutting tool 70, as shown in FIG.
The outer surface of the annular portion 18 is formed into a predetermined preliminary shape 32 (first cutting step). FIG. 4 (2) is a sectional view of the ceramic body 30 whose outer surface has a predetermined preliminary shape 32 by the first cutting step, and further includes a second cutting tool on the annular portion 18 thus rough cut. By performing finish cutting with 74 (second cutting step), the elevated plate 12 is formed on the bottom surface of the ceramic body 30 as shown in (3) of FIG. 4.

FIG. 5 is a schematic view of an elevated platform automatic forming apparatus 50 used in this embodiment.
Is to rotate the ceramic body 30 before firing about its central axis, and to cut the outer side surface of the rotating ceramic body 30 by bringing the cutting tool into contact with the outer side surface of the rotating ceramic body 30 to form the hill 12 on the ceramic body 30. It has a molding function. Further, the cutting tool attached to this elevated automatic forming apparatus 50 has a vertical first axis (z-axis) direction which is the central axis direction of the ceramic base 30 attached to the elevated automatic forming apparatus 50 by the configuration described later. And a horizontal second axis (x-axis) direction perpendicular to the first axis direction and a horizontal third axis (y-axis) perpendicular to the first axis direction and the second axis direction.
It can be moved in any direction.

FIG. 5A shows a plan view of the automatic platform forming apparatus 50 as seen from the first axial direction, and FIG. 5B shows a front view as seen from the second axial direction. In this hill molding device 50,
A first block 56 is attached to a first rail 54 fixed on the base 52 so as to be movable in the second axial direction, and the first block 5 is attached to an end of the first rail 54.
A first motor 58 for moving 6 is provided. In addition, the second rail 6 fixedly mounted on the first block 56.
The second block 62 is mounted at 0 so as to be movable in the first axial direction, and the second rail 60 has a second motor 64 for moving the second block 62 built therein. Further, a third rail 66 is attached to the second block 62 so as to be movable in the third axial direction, and a third motor 68 for moving the third rail 66 is attached to the third rail 66. It is built in. A tool rotation motor 72 that rotationally drives the first cutting tool 70 around its axis is fixedly installed at the work-side end of the third rail 66, and a second cutting tool 74 is attached. In the first cutting tool 70 and the second cutting tool 74, the first block 56 is relatively movable in the second axial direction with respect to the base 52, and the second rail 60 fixedly mounted on the first block 56. The second block 62 attached to the second rail 62 is movable relative to the second rail 60 in the first axial direction, and further, the third rail 66 attached to the second block 62.
Is relatively movable in the third axis direction with respect to the second block 62, and thus is relatively movable in the three-dimensional direction with respect to the base 52. The first cutting tool 70
Is for cutting the outer surface of the ceramic body 30 with its outer peripheral blade while rotating around its axis by the tool rotating motor 72.

On the other hand, a work fixing device 80 is attached to an upper and lower cylinder 78 integrally provided with a support column 76 fixed to the base 52 so as to be movable in the first axis direction, and similarly the base 5 is attached.
A hemispherical mounting device 84 is attached to the rocker 82 fixedly mounted on No. 2 so as to be rotatable about the first axis. A motor 86 is provided. The work fixing device 80 is moved in the first axis direction by the up-and-down cylinder 78 controlled by the up-and-down cylinder controlling solenoid valve 88 (not shown), and the holding device 90 provided at the lower end portion of the work-fixing device 80 and the rotary wheel. The ceramic base material 30, which is a work, is fixed between the hemispherical attachment device 84 attached to the device 82 and the centering work. The ceramic base 30 attached to the wheel 82 is, for example, 1000 to 150 around the first axis by the motor 82 for rotating the wheel.
It is rotated at a rotation speed such as 0 rpm, and the outer surface of the ceramic base material 30 is cut by sequentially contacting the first cutting tool 70 and the second cutting tool 74 with the outer surface thereof.
The base 12 is formed on the ceramic base 30.

Further, as shown in FIG. 6, in the hill automatic molding device 50, the first motor 58, the second motor 64, and the third motor 58 are controlled by the electronic control device 100 which performs signal processing in accordance with a program stored in advance in the ROM. The operations of the shaft motor 68, the tool rotation motor 72, the wheel rotation motor 86, and the vertical cylinder control solenoid valve 88 are drive-controlled.

FIG. 7 is a view for explaining the first cutting step in more detail. FIG. 7A is a schematic view of the ceramic base 30 and the first cutting tool 70 in the first cutting step as seen from the first axial direction, (B) is a sectional view showing the ceramic base 30 and the first cutting tool 70 in the first cutting step, similarly cut along a plane parallel to the first axis. As shown in this figure, the first cutting tool 70 used in the first cutting step is preferably a rotary cutting tool having an outer peripheral blade, for example, an end mill, and the first cutting tool 70 is rotated around its axis. While performing the above, the outer peripheral surface of the ceramic body 30 is cut by the outer peripheral blade of the first cutting tool 70, whereby more efficient rough cutting can be performed.

Since the first cutting tool 70 is capable of three-dimensional movement as described above, it is preferable to perform cutting while applying movement in the first axial direction as shown in FIG. 7 (b). That is, a cut is made from the edge of the annular portion 18 formed on the ceramic base material 30, and the first cutting tool 70 is moved in the second axial direction and the third axial direction so that the annular portion 18 has a predetermined preliminary shape. The first cutting tool 70 is released from the container-shaped main body side when the outer surface of the annular portion 18 has a predetermined preliminary shape 32 while being cut into Prior to the cutting process, the annular portion 18 of the predetermined preliminary shape 32 can be quickly obtained.

FIG. 8 is a view for explaining the second cutting process in more detail, and FIG. 8A is a schematic view of the ceramic base 30 and the second cutting tool 74 in the second cutting process as seen from the first axial direction, FIG. 8B shows the ceramic base 30 and the second cutting tool 74 in the second cutting step in FIG.
It is sectional drawing cut and shown by the plane shown by the dashed-dotted line b offset by the distance A from the plane containing the central axis of the ceramic body 30 shown in FIG. A stationary blade such as a cutting tool is used for the second cutting tool 74. Furthermore, this second cutting tool 74
As shown in FIG. 8 (b), by using a cutting tool having a cutting edge with a curved line similar to a part of the finished shape of the edge of the platform 12, more efficient finishing cutting can be performed. it can.

In the second cutting step, the second cutting tool 74 is used.
Is cut into a portion of the porcelain base material 30 which is to be an edge of the platform 12 so as to form a predetermined right rake angle with respect to the ceramic base material 30 (cutting step). That is, FIG.
In (a), the first cutting tool 70 and the ceramic base 30 are brought into contact with each other on a plane indicated by the alternate long and short dash line b which is offset by about 15 mm from the plane including the central axis of the ceramic base 30 indicated by the single-dot chain line a. Following this, while moving the second cutting tool 74 in the second axis direction and the third axis direction so that the rake angle is gradually reduced, the first axis is moved along the finished shape of the ceramic body 30. The second cutting tool 74 is allowed to escape from the container-shaped main body side when the finished shape of the platform 12 is obtained by cutting while moving in the direction (finishing step). In the annular portion 18 formed on the ceramic base material 30 before cutting, the portion that becomes the edge of the hill 12 tends to be hardened by drying, so as described above, when cutting the edge, a large rake angle is required. By cutting the cutting resistance to a low level and gradually cutting the rake angle according to the progress of hardening, cutting is performed along the finished shape of the ceramic body 30 to rapidly form the high-precision high base 12. can do.

As described above, in this embodiment, the movement of the first cutting tool 70 and the second cutting tool 74 is controlled by the electronic control unit 100.
Since it is controlled by, it is possible to finely adjust the speed and freely set the trajectory, and a high yield can be realized without causing defects such as misalignment or breakage. Further, the outer side surface of the ceramic base material 30 which is roughly cut in the first cutting step (rough cutting step) and has a predetermined preliminary shape 32 is further provided with a second
Finishing cutting in the cutting process (finishing cutting process) shortens the time required for manufacturing as compared with the method of cutting with only one type of finishing blade, and the predetermined cutting is performed by passing through the first cutting process. Since the outer surface formed into the preliminary shape 32 is cut in the second cutting step, the cutting resistance is small and problems such as shavings are unlikely to occur. Further, since it is possible to provide reproducibility by electronic control with respect to the attachment of the cutting tool, the setting of the cutting speed, etc., the work for changing the ceramic base material 30 as the work is easy.

Further, in this embodiment, in the first cutting step, the first cutting tool 7 which is a rotary cutting tool having an outer peripheral blade is used.
While rotating 0 around its axis, the ceramic base 3
Since the outer surface of No. 0 is cut by the outer peripheral blade of the first cutting tool 70, the outer surface of the predetermined shape 32 can be quickly obtained prior to the second cutting step which is finishing cutting.

Further, in this embodiment, the second cutting tool 7 is used.
Reference numeral 4 denotes a first axial direction which is a central axial direction of the ceramic body 30, a second axial direction perpendicular to the first axial direction, and the first axial direction.
The second cutting step is such that the cutting edge of the second cutting tool 74 is movable with respect to the ceramic base 30 in a third axial direction perpendicular to the axial direction and the second axial direction. The hill 12 of the ceramic base 30 so as to form a right rake angle
And a second cutting tool 74 is moved in the second axial direction and the third axial direction so that the rake angle is gradually reduced, and Since it includes a finishing step of cutting while moving in the first axis direction along the finished shape of 30,
At the time of cutting the part which becomes the end edge of the elevated plate 12 that has been hardened by drying, the cutting resistance is kept low by taking a large rake angle, and the rake angle is gradually reduced according to the progress of hardening, while the porcelain is produced. By cutting along the finished shape of the base material 30, it is possible to quickly form the high-precision platform 12.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention is not limited to this and can be implemented in other modes.

For example, in the above-described embodiment, the rough cutting in the first cutting step and the second rough cutting in the first cutting step are performed by using the single elevated plate forming apparatus 50 to which the first cutting tool 70 and the second cutting tool 74 are attached. Although finish cutting in the cutting process was sequentially performed, the present invention is not limited to this,
For example, the first cutting process device to which the first cutting tool 70 is attached and the second cutting process device to which the second cutting tool 74 is attached are used as two high-plate automatic forming devices.
Rough cutting in the cutting step and finish cutting in the second cutting step may be performed substantially at the same time. By doing so, the time required for forming the elevated plate is further shortened.

Further, in the above-mentioned embodiment, the end mill which is a rotary cutting tool having an outer peripheral blade is used as the first cutting tool 70, but this uses a rotary cutting tool such as a flat milling cutter. Alternatively, a tool such as a stationary blade or the like may be used as the first cutting tool 70 as long as the outer surface of the predetermined shape 32 can be formed prior to the second cutting step of finish cutting.

Further, in the above-described embodiment, the second cutting tool 74 is a cutting tool having a cutting edge having a curved line similar to a part of the finished shape of the edge of the elevated plate 12, but A normal cutting tool may be used as long as it is a cutting tool that can suitably form the platform 12 on the ceramic base 30.

Further, in the above-described embodiment, the cutting step of the second cutting step is performed so that the cutting edge of the second cutting tool 74 takes a predetermined right rake angle with respect to the ceramic body 30.
The cutting tool 74 was cut into a plane indicated by the alternate long and short dash line b in FIG. 8A, which was offset by about 15 mm from the plane including the central axis of the ceramic body 30. The size of the suitable rake angle with respect to the ceramic base 30 is determined by the shape or size of the ceramic base 30 that is the work, so the plane cut by the second cutting tool 74 is the central axis of the ceramic base 30. The present invention is not limited to a plane offset by about 15 mm from the plane containing it.

Although not illustrated one by one, the present invention is implemented with appropriate modifications within the scope of the invention.

[Brief description of drawings]

FIG. 1 is a perspective view showing a comparison between a pottery having a platform having a relatively deep neck and a pottery having a platform having a relatively shallow neck.

FIG. 2 is a diagram showing a method of forming a plateau having a relatively deep constriction on a ceramic body by using a cutting device associated with an automatic machine.

FIG. 3 is a diagram showing a method of molding a ceramic body having a relatively deep platform by separately molding the container-shaped main body and the platform and joining them together.

FIG. 4 is a diagram showing a method of forming a platform which is an embodiment of the present invention.

FIG. 5 is a schematic view of an elevated molding apparatus used in this example.

FIG. 6 is a block diagram illustrating a control system of a platform forming apparatus used in this embodiment.

FIG. 7 is a diagram for explaining the first cutting step of the present embodiment in more detail.

FIG. 8 is a diagram for explaining the second cutting step of the present embodiment in more detail.

[Explanation of symbols]

12: hill 14: Constriction 18: Ring part 30: Ceramic base 32: Preliminarily shaped outer surface 50: Automatic hill molding machine 70: First cutting tool 74: Second cutting tool 100: Electronic control device

Continued front page    (72) Inventor Tsutomu Inagaki             Noritake Shincho 3-chome 1-36, Nishi-ku, Nagoya-shi, Aichi             Noritake Co., Ltd. Limited             Within

Claims (3)

[Claims] 1. A ceramic base material before firing is rotated about its central axis and a cutting tool is brought into contact with the outer side surface of the ceramic base material to cut the outer side surface, thereby forming a hill on the ceramic base material. A method of forming a high ground of a ceramic body, comprising: a first cutting step of cutting an outer surface of the ceramic body into a predetermined preliminary shape by a first cutting tool whose movement is controlled by an electronic control device; A second cutting step in which the outer surface of the ceramic base material formed into a predetermined preliminary shape by the first cutting step is cut by a second cutting tool whose movement is controlled by an electronic control device to form a hill on the ceramic base material. And a method for forming elevated ground of a ceramic body. 2. In the first cutting step, while rotating a first cutting tool, which is a rotary cutting tool having an outer peripheral blade, around its axis, the outer peripheral surface of the ceramic body is peripherally cut by the outer peripheral blade of the first cutting tool. The method for forming a hill on a ceramic base according to claim 1, wherein the method is performed by cutting. 3. The second cutting tool includes a first axial direction which is a central axial direction of the ceramic body, a second axial direction perpendicular to the first axial direction, the first axial direction and the second axial direction. The second cutting step is such that the cutting edge of the second cutting tool forms a predetermined right rake angle with respect to the ceramic body. A cutting step of cutting into a portion which will be an edge portion of a hill of a ceramic body, and moving the second cutting tool in the second axial direction and the third axial direction so that the rake angle gradually decreases, A finishing step of cutting while moving in the first axis direction along the finished shape of the ceramic body, the method for molding a hill of a ceramic body according to claim 1 or 2.