JP2989764B2 - Method of manufacturing oilless bearing and mold for manufacturing oilless bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oilless bearing which does not require oil supply to prevent seizure during use, a method of manufacturing an oilless bearing, and a mold for manufacturing an oilless bearing.

[0002]

2. Description of the Related Art In resin molding using a pair of upper and lower plastic dies and press dies, one of the upper and lower dies is fixed, and the other die is moved up and down. In order to ensure the accuracy of the resin molded product, the movable mold and the press mold are fixed at both ends of the movable mold to a metal bearing fitted to a metal shaft. Is made to slide on the shaft. When the bearing slides on the shaft, frictional heat is generated between the bearing and the shaft, causing a problem that the bearing and the shaft are seized. If the bearing and the shaft seize, the bearing will not slide on the shaft.

Conventionally, seizure between the bearing and the shaft has been prevented by supplying oil to the bearing. However, when resin molding is performed using a plastic mold or a press mold, in order to supply oil to the bearing, it is necessary to temporarily stop the operation and supply oil. Therefore, in recent years, oilless bearings that do not require the supply of oil for preventing seizure during use have been developed.
This oil-less bearing is formed of metal in a cylindrical shape, forms a hole penetrating from the outer surface of the cylinder to the inner surface, for example, press-fits and pours a solid lubricant of molybdenum disulfide into the hole,
It is attached by a method such as fixing with an adhesive.

[0004]

In this manner, a plurality of holes are formed in the cylinder from the outer surface to the inner surface, and a solid lubricant of molybdenum disulfide is press-fitted, poured, and fixed with an adhesive. Because of the method described above, it may easily fall off or become hollow during use, and the function as a lubricant may be impaired.

An object of the present invention is to form a lubricant film uniformly on a sliding surface, to have high thermal shock resistance and chemical resistance, to be resistant to heat, to have a small coefficient of thermal expansion, to fall off during use, The purpose of the present invention is to prevent the lubricant from being scooped.

[0006]

According to a first aspect of the present invention, a plurality of notches are formed in a peripheral end portion at one end in the axial direction.
_The sand is solidified by a solidification method such as method ₂ to form a columnar body, formed into a disk shape, and cut at the circumferential end of one end in the axial direction at positions opposite to the notches formed in the cylindrical body. Along with forming the notch, a plurality of notches are formed at the peripheral end of the other end in the axial direction with the position and phase difference of the notch formed at one end in the axial direction, and the sand is solidified by a solidifying method such as a CO ₂ method. An intermediate body is formed, and the plurality of intermediate bodies are overlapped and bonded between the two cylindrical bodies so that the notches formed at the peripheral ends thereof are aligned with each other. A solid lubricant is inserted into and adhered to the bottomed hole formed by the notch of the body to form a core, and a large-diameter cylindrical main body forming section and both ends of the cylindrical main body forming section are formed. Forming a baseboard storage section for storing a baseboard that has been cut into a cylindrical shape having the same diameter as that of the core; The core is housed in the mold by fitting both ends of the core into the baseboard accommodating portion of the split mold so as to pass over the both ends, and molten metal is poured into the cylindrical main body forming portion of the mold. After the solid lubricant attached to the outer peripheral surface of the child is cast into the inner wall surface of the cylindrical main body and the molten metal is cooled and solidified, the mold is opened, the cylindrical main body is taken out, and stored in the cylindrical portion of the cylindrical main body. The solid lubricant that has collapsed and the solid lubricant that protrudes inward from the inner wall surface of the cylindrical main body is formed by shaving off the solid lubricant. By forming in this manner, a core for easily manufacturing an oilless bearing can be manufactured, and an oilless bearing can be easily manufactured.

According to a second aspect of the present invention, a solid lubricant is provided.
It is composed of graphite. By using such graphite as a solid lubricant in this way, it is strong against heat, can have a small expansion rate due to heat, and can have high thermal shock resistance and chemical resistance.

According to a third aspect of the present invention, a solid lubricant is provided.
It is formed in a columnar pin shape. By forming the columnar pin in this manner, a solid lubricant (graphite) coating can be uniformly formed between the inner wall surface of the bearing and the shaft.

According to a fourth aspect of the present invention, the bottomed hole of the core formed by the notch of the cylindrical body and the notch of the intermediate body is provided.
The peripheral end is formed on the outer peripheral surface at equal intervals toward the center line. With this configuration, any solid lubricant can always maintain a circular shape on the bearing inner wall surface, and a solid lubricant (graphite) coating can be uniformly formed between the bearing inner wall surface and the shaft.

According to a fifth aspect of the present invention, the bottomed holes of the core are formed regularly at adjacent formation positions with steps. Therefore, a coating of the solid lubricant (graphite) can be uniformly formed on almost the entire inner wall surface of the bearing.

According to a sixth aspect of the present invention, there is provided a first plate member in which a plurality of semi-cylindrical projections forming notches are arranged at equal intervals on a peripheral end toward a center line; A columnar body forming die formed by a hollow first frame member that forms a concave portion fitted to a part of the projection of the plate member and covers a part of the projection to regulate the outer diameter of the columnar body; A second plate member in which a plurality of semi-cylindrical protrusions forming notches are arranged at equal intervals on the peripheral end toward the center line, and fitted to a part of the protrusions of the second plate member A concave portion is formed at one end, the intermediate body is formed in a hollow shape by regulating the outer diameter and thickness, and a cutout is formed at the other end from a position which is circumferentially shifted from the concave portion forming position of the one end. An intermediate-forming mold in which a plurality of cylindrical protrusions are protruded toward the center line and a plurality of the protrusions are arranged at equal intervals on the other circumferential end. When core box consisting Te, templating the outer shape of the bearing, the main type obtained by forming a core print at both ends, the main mold by buried in sand, sand CO ₂ method, such as shell mold method A cylindrical main body forming portion solidified by a solidifying method and penetrated into a large-diameter semi-cylindrical shape, and a baseboard hollowed into a semi-cylindrical shape smaller in diameter than the cylindrical main body forming portion at both ends of the cylindrical main body forming portion. An upper mold formed with a baseboard storage portion to be formed, a cylindrical main body forming portion formed by solidifying sand by a solidifying method such as a CO ₂ method or a shell molding method and penetrating into a large-diameter semi-cylindrical shape; A mold formed by a lower mold formed at both ends of the main body forming part with a baseboard storage part for storing a baseboard penetrating into a semi-cylindrical shape having a smaller diameter than the cylindrical main body forming part. It is. As described above, the core is formed into two types, ie, the cylindrical body forming type and the intermediate body forming type.
Since it is configured using two molds, a solid lubricant can be easily attached to the outer peripheral surface of the core, and an oilless bearing can be easily manufactured.

According to a seventh aspect of the present invention, the cylindrical body forming die is configured so that the first frame member can be divided into two.
The intermediate forming die is configured so that the second frame member can be divided into two. Therefore, the core can be easily formed.

[0013]

[0014]

[0015]

[0016]

Embodiments of the present invention will be described below. FIG. 1 shows an embodiment of an oilless bearing according to the present invention. In the figure, reference numeral 1 denotes an oilless bearing, and on the inner wall surface of a metal cylinder 2 formed in a cylindrical shape,
A plurality of bottomed holes 3 are formed. Each of the bottomed holes 3 has a disk-shaped solid lubricant 4 embedded therein. The solid lubricant 4 is, specifically, graphite (graphite), one of the allotropes of carbon, and is a hexagonal crystal having a layered structure in which six carbon rings are stacked two-dimensionally. Naturally, what is called scale-like graphite or earthy-smoke is produced depending on the nature of production.
Artificial graphite obtained by heating (graphitizing) to 00 to 3000 ° C. (heating to 3000 ° C. or higher is necessary to obtain a complete graphite structure) is mainly used. By using such graphite as a solid lubricant, it is possible to enhance resistance to heat, a small coefficient of expansion due to heat, and high thermal shock resistance and chemical resistance.

FIG. 2 shows an embodiment of a method of manufacturing an oilless bearing according to the present invention. In the figure, 5
Is a core formed by solidifying sand by a solidifying method such as a CO ₂ method or a shell mold method, and is for forming a hollow portion of the cylindrical oilless bearing 1. The core 5 has a cylindrical body 6 formed by forming a baseboard and solidifying sand by a solidifying method such as a CO ₂ method or a shell mold method, and a cylindrical body 6 formed in a disk shape by a CO ₂ method or a shell mold method. A plurality of pieces (4 in this embodiment) formed by solidifying sand by a solidification method
) Intermediate 7. 8 is the core 5
Is a solid lubricant formed into a cylindrical pin shape and fitted into a bottomed hole 9 (see FIG. 5) formed on the outer peripheral surface of the solid lubricant. Reference numeral 10 denotes a mold, which includes an upper mold 11 and a lower mold 12. The oilless bearing 1 is formed by storing the core 5 in the upper mold 11 and the lower mold 12 and injecting the molten metal into the mold 10.

Next, a method of manufacturing the oilless bearing 1 will be described with reference to FIGS. In FIG. 3, reference numeral 13 denotes a cylindrical body forming die for manufacturing the cylindrical body 6 of the core 5. Reference numeral 14 denotes a plate member in which a plurality of semi-cylindrical projections 15 are arranged in a substantially central portion at equal intervals toward the center line. Reference numeral 16 denotes a frame member, which is formed in a hollow shape, and is configured to be dividable into a right frame member 17 and a left frame member 18. On the hollow side of one surface (the lower surface side in FIG. 3) of the right frame member 17, a concave portion 19 that fits into a part of the projection 15 of the plate member 14 is formed. A concave portion 20 that fits into a part of the protrusion 15 of the plate member 14 is formed on the hollow side of the surface (the lower surface side in FIG. 3). The frame member 16 constituted by the right frame member 17 and the left frame member 18 covers a part of the projection 15 of the plate member 14 and regulates the outer diameter of the cylinder 6 to form the cylinder 6 of the core 5. It is for doing. Although the outer shape of the frame member 16 shown in the drawings in the present embodiment is a square shape,
This is to facilitate setting when the frame member 16 is set on the plate member 14, and may have any shape such as a circle, a hexagon, and an octagon.

Reference numeral 21 denotes a regulating frame provided on the plate member 14, and when the right frame member 17 and the left frame member 18 are set on the plate member 14, the right frame member 17 and the left frame member 18 have no gap. The right frame member 17 and the left frame member 18
This is for positioning and fixing so as not to move. The production of the cylindrical body 6 of the core 5 is performed by the regulation frame 2 of the plate member 14.
1, the right frame member 17 and the left frame member 18 are fitted, and the concave portion 19 of the right frame member 17 and the concave portion 20 of the left frame member 18 are
To form a frame member 16. Thereafter, sand is inserted into the frame member 16 and the sand is solidified by a solidifying method such as a CO ₂ method or a shell mold method to form a cylindrical body 6 as shown in FIG. The plate member 1 is attached to one of the cylindrical bodies 6.
The notch 22 is formed by the semi-cylindrical projection 15 provided on the fourth. The other side of the cylindrical body 6 is a part corresponding to a baseboard, and the cylindrical bodies used at both ends of the core 5 are:
The cylindrical body 6 formed by the cylindrical body forming die 13 is used.

FIG. 4 shows an intermediate forming mold 23. Reference numeral 24 denotes a plate member in which a plurality of semicircular columnar projections 25 are arranged at substantially equal intervals at regular intervals toward the center line. Reference numeral 26 denotes a frame member having a thickness for forming the intermediate body 7 of the core 5, formed in a hollow shape, and configured to be divided into two, a right frame member 27 and a left frame member 28. That is, the thickness of the intermediate body 7 is determined by the thickness of the frame member 26. The thickness of the frame member 26 is determined by the mounting interval in the axial direction of the solid lubricant 4 mounted on the outer peripheral surface of the core 5. The protrusion 2 of the plate member 24 is provided on the hollow portion side of one surface (the lower surface in FIG. 4) of the right frame member 27.
5 is formed so as to fit with the projection 25 of the plate member 24, and the other surface (the upper surface in FIG. 4) of the right frame member 27 is provided with the bottomed hole 9 in the intermediate body 7. In order to form (see FIG. 5), a plurality of semi-cylindrical projections 30 are arranged at equal intervals toward the center line at substantially the middle positions of the adjacent concave portions 29 which are shifted from the positions where the concave portions 29 are formed. Have been. On the hollow side of one surface (the lower surface in FIG. 4) of the left frame member 28, a concave portion 31 that fits a part of the projection 25 of the plate member 24 is formed in accordance with the projection 25 of the plate member 24. The other surface (the upper surface in FIG. 4) of the left frame member 28 is shifted from the position where the concave portion 31 is formed in order to form the bottomed hole 9 (see FIG. 5) in the intermediate body 7. A plurality of semi-cylindrical projections 32 are arranged at regular intervals toward the center line at a substantially intermediate position between the adjacent concave portions 31.

The frame member 26 constituted by the right frame member 27 and the left frame member 28 covers a part of the projection 25 of the plate member 24 and regulates the outer diameter of the intermediate body 7. Body 7
Is formed. The outer shape of the frame member 26 shown in the drawings in the present embodiment is square, but this is for facilitating setting when the frame member 26 is set on the plate member 24. The shape may be any shape such as a circle, a hexagon, and an octagon. The outer shape of the frame member 26 shown in the drawings in the present embodiment is a square shape.
This is for facilitating setting when setting the plate 6 on the plate member 24, and may have any shape such as a circle, a hexagon, and an octagon.

Reference numeral 33 denotes a regulating frame provided on the plate member 24. When the right frame member 27 and the left frame member 28 are set on the plate member 24, the right frame member 27 and the left frame member 28 have no gap. The right frame member 27 and the left frame member 28
This is for positioning and fixing so as not to move. The production of the intermediate body 7 of the core 5
3, the right frame member 27 and the left frame member 28 are fitted into each other, and the concave portion 29 of the right frame member 27 and the concave portion 31 of the left frame member 28 are attached to the plate member 24.
To form a frame member 26. Thereafter, sand is inserted into the frame member 26, and the sand is solidified by a solidifying method such as a CO ₂ method or a shell mold method to form an intermediate 7 as shown in FIG. A cutout 34 is formed at the peripheral end of one surface of the intermediate body 7 by a semi-columnar projection 25 provided on the plate member 24. A cutout 35 is formed at the peripheral end of the other surface of the intermediate body 7 by semi-cylindrical projections 30 and 32 provided on the right frame member 27 and the left frame member 28. The positional relationship between the notch 34 and the notch 35
Are provided between two notches 35 adjacent to each other (the notches 35 are located between two notches 34 adjacent to each other).

In manufacturing the intermediate body 7 of the core 5, first, the concave portion 29 of the right frame member 27 is fitted into the semi-cylindrical projection 25 provided on the plate member 24 in the regulating frame 33 of the plate member 24. As described above, the frame member 16 is formed by fitting the concave portion 31 of the left frame member 28 into the semi-cylindrical protrusion 25 provided on the plate member 24. Thereafter, sand is inserted into the frame member 26, and the sand is solidified by a solidifying method such as a CO ₂ method or a shell mold method to form an intermediate 7 as shown in FIG. This intermediate body 7 has a notch 34 formed by a semi-cylindrical projection 25 provided on the plate member 24 at the outer peripheral end of one surface thereof.
However, a notch 35 formed by semi-cylindrical projections 30 and 32 provided on the right frame member 27 and the left frame member 28 is formed at the outer peripheral end of the other surface. The position of the notch 34 formed on the outer peripheral end of one surface of the intermediate 7 manufactured by the intermediate forming die 23 and the position of the notch 35 formed on the outer peripheral end of the other surface are determined. Since it is formed shifted, it can be manufactured using the same intermediate 7 by alternately changing the overlapping surface of the intermediate 7.
The core forming die 13 and the intermediate forming die 23 constitute a core take-out.

The column 6 of the core 5 is manufactured according to FIG.
When the intermediate body 7 of the core 5 is manufactured as shown in FIG. 4, the intermediate body 7 is bonded to the cylindrical body 6 with an adhesive as shown in FIG. When the intermediate 7 is fitted to the column 6, the notch 22 of the column 6 and the notch 34 of the intermediate 7
It joins so that the bottomed hole 9 may be formed. The intermediate body 7 is further bonded to the intermediate body 7 joined to the columnar body 6 with an adhesive. When the next intermediate 7 is combined with the intermediate 7, the notch 34 of the intermediate 7 and the notch 35 of the intermediate 7 are joined so that the bottomed hole 9 is formed. In the same manner, the intermediate bodies 7 are successively joined, overlapped so as to match the length of the bearing, and the columnar body 6 was fitted to the final end and bonded with an adhesive. When the cylindrical body 6 is fitted to the intermediate body 7, the notch 34 of the intermediate body 7 and the notch 22 of the cylindrical body 6 are joined so that the notch 34 of the intermediate body 7 is fitted to the intermediate body 7 so that the bottomed hole 9 is formed.

As described above, the core 5 as shown in FIG. 6 can be manufactured by overlapping the cylindrical body 6, the intermediate body 7, the intermediate body 7, the intermediate body 7, the intermediate body 7, and the cylindrical body 6 and bonding them together. . The core 5 as shown in FIG.
2 and the notches 34 and 35 of the intermediate body 7 form a bottomed hole 9 in the outer peripheral surface of the core 5. The solid lubricant 8 formed in a cylindrical pin shape is bonded to the bottomed hole 9 with an adhesive. The length of the solid lubricant 8 is formed longer than the bottomed hole 9, and when the solid lubricant 8 is attached with an adhesive, the solid lubricant 8 is in a state of protruding outside. The state in which the solid lubricant 8 is inserted into the bottomed hole 9 formed on the outer peripheral surface of the core 5 is the core 5 shown in FIG.

The core 5 manufactured as described above is housed in a mold 10 and a molten metal is poured into the mold 10 to manufacture an oilless bearing. The mold 10 is configured as shown in FIG. In the drawing, a mold 10 is configured such that an upper mold 11 and a lower mold 12 formed in a box shape can be divided into upper and lower two parts. When manufacturing the mold 10, first,
Sand is put into the lower mold 12, and the main mold 36 is housed half way along the axis of the main mold 36, and the sand is solidified by a solidifying method such as a CO ₂ method or a shell mold method. As shown in FIG. 7, the main mold 36 has a main body 37 formed in a columnar shape, and a core formed in a columnar shape with a diameter smaller than the outer diameter of the columnar body of the main body 37 at both ends of the main body 37. In this case, it is constituted by a baseboard 38 serving as a part for supporting the core, and is formed so as to be dividable into two on the shaft as shown in FIG. The difference between the diameter of the main body 37 of the main mold 36 and the diameter of the baseboard 38 of the main mold 36 becomes the thickness of the bearing.

Similarly, sand is put into the upper mold 11, and the main mold 36 is housed halfway along the axis of the main mold 36, and the sand is solidified by a solidifying method such as a CO ₂ method or a shell mold method. As shown in FIG. 7, when the main mold 36 is removed from the upper mold 11 and the lower mold 12, hollow portions 39 and 40 in which the main mold 36 is molded are formed in the upper mold 11 and the lower mold 12, respectively. In the hollow portion 39 of the upper mold 11, a cylindrical main body forming portion 41 having a large diameter and having a hollow cylindrical shape, and both ends of the cylindrical main body forming portion 41 having the same diameter as the diameter of the baseboard 38 of the main mold 36. A skirting board storage portion 42 for storing the skirting board portion of the cylindrical body 5 having a diameter (the same diameter as the diameter of the core 5) is formed. Further, similarly to the upper mold 11, the hollow body 40 of the lower mold 12 has a cylindrical main body forming portion 43.
And a baseboard storage section 44 for storing the baseboard section of the columnar body 5.

As shown in FIG. 2, a solid lubricant 8 is attached to the outer peripheral surface of the mold 10 with an adhesive as shown in FIG. When the molten metal is poured into the mold 10 by combining the upper mold 11 and the lower mold 12 and covering the outer peripheral surface of the core 5, the molten metal is wrapped around the solid lubricant 8 protruding from the outer peripheral surface of the core 5. Is full. Thereafter, when the melt cools and solidifies, the volume shrinks when the melt solidifies, so that the solid lubricant 8 in which the melt is embedded is fixed firmly (casting). The solid lubricant 8 is reliably buried in the inner wall surface of the bearing by casting.

After cooling and solidification, the cast product is taken out of the mold 10, the core 5 made of sand is broken, and the sand is removed. As shown in FIG.
Taken out. The bearing 45 has a state in which the solid lubricant 8 protrudes from the inner surface of the hollow portion 47 of the metal cylinder 46 formed in a cylindrical shape. The oilless bearing 1 as shown in FIG. 1 is manufactured by shaving off the solid lubricant 8 projecting into the hollow portion 47.

[0030]

According to the first aspect of the present invention, a core for easily manufacturing an oilless bearing can be manufactured, and a solid lubricant is embedded in the inner wall surface of the cylindrical main body. Therefore, the shaft and the inner wall surface of the bearing hold down the solid lubricant embedded in the inner wall surface, so that it is possible to prevent the solid lubricant from falling off during use and the solid lubricant from being clogged.

According to the second aspect of the present invention, it is strong against heat, can have a small expansion rate due to heat, and can have high thermal shock resistance and chemical resistance.

According to the third aspect of the present invention, a solid lubricant (graphite) film can be uniformly formed between the inner wall surface of the bearing and the shaft.

According to the fourth aspect of the invention, any solid lubricant can always maintain a circular shape on the inner wall surface of the bearing, and a uniform coating of the solid lubricant (graphite) can be formed.

According to the fifth aspect of the present invention, a solid lubricant (graphite) coating can be uniformly formed on substantially the entire inner wall surface of the bearing.

According to the sixth aspect of the invention, the solid lubricant can be easily attached to the outer peripheral surface of the core, and the oilless bearing can be easily manufactured.

According to the seventh aspect of the present invention, the core can be easily formed.

[0037]

[0038]

[0039]

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of an oilless bearing according to an embodiment of the present invention.

FIG. 2 is an overall perspective view showing a method of manufacturing the oilless bearing according to the embodiment of the present application.

FIG. 3 is an overall perspective view of a cylindrical body forming die for manufacturing the core cylindrical body shown in FIG. 2;

FIG. 4 is an overall perspective view of an assembly of an intermediate forming die for manufacturing the core intermediate shown in FIG. 2;

FIG. 5 is an overall perspective view of the core shown in FIG. 2;

6 is an overall perspective view showing a state where the core shown in FIG. 2 is assembled.

FIG. 7 is a view for explaining a step of manufacturing the mold shown in FIG. 2 using a main mold.

FIG. 8 is a partially broken whole perspective view of a bearing manufactured using a cylindrical body forming mold, an intermediate body forming mold, and a mold.

[Explanation of symbols]

1 ……………………… Oilless bearings 2 …………………………………………………………………………………………………………………… ………………………………………………………………………… Solid lubricant 5 …………… ………………………………………………………………………………………………………………………………………… 7 ………………………………………………………………………… Solid lubricant 9 ………………………………………………… Bottom hole 10 ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………. ………………………………………………………………………………………………………………………………………………………………. ............ board Member 15 ... Projection 16 ... Frame member 17 ... ……………… Right frame member 18 …………………………………… Left frame member 19 ………………………… ... Recesses 20......... ……………………… Notch 23 ……………………………………………………………………………………………………………………………………… …………………………………………………………………………… Projection 26 …………………………………………………………… Frame member 27 ……………………… Right frame member 28 ………………………………………………………………………………………………………………………………………………………………………………………………………………………… …………………………… Recessed part 30 …………………………………………… Projection 31 …………………… ………… Recess 32 …………………………… Protrusion 33 ………………………………………………………………………………………………………………………………………………………… …………………………… Notch 35 ………………………………………… Notch 36 ……………………………. ……………………………………………………………………………………… Body 38 …………………………………………………………………………… Tree 39 ………………………… Hollow part 40 ………………………………… Hollow part 41 …………… …………………………………………………………………………………………………………………… Baseboard storage section 43 …………… … ………………………………………………………………………………………………………………… Baseboard storage section 45 …………………………… …… Bearing 46 …………………………………………………………………………………………………… Hollow section

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B22D 19/00 B22C 9/10 B22C 9/22 F16C 33/10

Claims (7)

(57) [Claims] 1. A plurality of notches are formed at a peripheral end of one end in the axial direction, sand is solidified by a solidifying method such as a CO ₂ method to form a columnar body, formed into a disk shape, and formed into a disk shape. A notch is formed at a position opposite to the position of the notch formed in the cylindrical body at the peripheral end, and the position of the notch formed at one end in the axial direction is different from the position of the notch formed at one end in the axial direction at the other end in the axial direction. To form a plurality of notches and solidify the sand by a solidifying method such as a CO ₂ method to form an intermediate, and the plurality of intermediates are formed at the peripheral end between the two cylindrical bodies. The cores are formed by superimposing and adhering the notches so that they are aligned with each other, inserting a solid lubricant into the bottomed hole formed by the notch of the columnar body and the notch of the intermediate body, and forming a core. A cylindrical main body forming portion formed in a cylindrical shape and a column having the same diameter as the core at both ends of the cylindrical main body forming portion. A baseboard storage section for storing the pierced baseboard is formed, and the core is fitted into the baseboard storage section of the mold divided into upper and lower parts so as to pass both ends of the core. After the molten metal is poured into the cylindrical body forming portion of the mold, the solid lubricant attached to the outer peripheral surface of the core is cast on the inner wall surface of the cylindrical body, and the molten metal is cooled and solidified. Opening the mold, taking out the tubular body, breaking the core housed in the tubular portion of the tubular body, and shaping off the solid lubricant projecting inward from the inner wall surface of the tubular body. Method of manufacturing oilless bearings. 2. The solid lubricant according to claim 1, wherein said solid lubricant is graphite.
3. The method for producing an oilless bearing according to item 1. 3. The method for manufacturing an oilless bearing according to claim 1, wherein the solid lubricant is formed in a cylindrical pin shape. 4. The bottomed hole of the core formed by the notch of the columnar body and the notch of the intermediate body is formed on the outer peripheral surface by dividing a peripheral end part at equal intervals toward a center line. The method for manufacturing an oilless bearing according to claim 1, 2, or 3. 5. The method of manufacturing an oilless bearing according to claim 1, wherein the bottomed holes of the core are formed such that adjacent formation positions are regularly formed with a step. 6. A first plate member in which a plurality of semi-cylindrical protrusions forming notches are arranged at equal intervals on a peripheral end toward a center line, and one of the protrusions of the first plate member is provided. Forming a notch formed with a hollow first frame member that forms a concave portion that fits into the portion and covers a part of the protrusion to regulate the outer diameter of the cylindrical body; and forms a notch. A second plate member in which a plurality of semi-cylindrical projections are arranged at equal intervals on the peripheral end toward the center line;
A concave portion that fits into a part of the projection of the plate member is formed at one end,
A semi-cylindrical projection that defines a notch at the other end and a circumferentially shifted position from the concave portion forming position at the one end while regulating the outer diameter and thickness of the intermediate body and forming a hollow shape at the other end. The outer shape of the bearing, which is formed by an intermediate body forming die which protrudes toward the other end and is arranged at equal intervals on the other circumferential end, and the outer shape of the bearing are formed, and a baseboard is formed at both ends. A main body formed by immersing the main mold in sand, solidifying the sand by a solidification method such as a CO ₂ method, and forming a cylindrical main body formed into a semi-cylindrical shape having a large diameter; The upper mold is formed at both ends of the base with a baseboard storage section for storing a baseboard that has been cut into a semi-cylindrical shape with a smaller diameter than the cylindrical body formation section, and the sand is solidified by a solidification method such as CO ₂ method And a cylindrical body forming portion which is hollowed into a semi-cylindrical shape having a large diameter, and a semi-cylindrical shape having a smaller diameter than the cylindrical body forming portion at both ends of the cylindrical body forming portion A mold for producing an oil-less bearing, comprising: a mold formed by a lower mold having a baseboard storage portion for storing a baseboard that has been mounted. 7. The method according to claim 7, wherein the first frame member is formed of two columns.
It is constructed so that it can be divided into two parts.
7. The mold according to claim 6, wherein the frame member is configured to be divided into two.