JP2019034475A - Mold, rubber roll manufacturing apparatus and rubber roll manufacturing method - Google Patents

Abstract

To shorten a length of a path required for a liquid rubber that has flowed out from the other axial end of a first mold to reach a visible position, compared with that of a structure which distributes the liquid rubber which flowed out from the other axial end of the first mold only through a groove formed along the axial direction on an inner peripheral surface of a cylindrical part of a second mold.SOLUTION: A mold comprises: a first mold which has a cylindrical shape surrounding a core member and in which a liquid rubber is injected between one axial end and the core member; a second mold mounted on the other axial end of the first mold and having a cylindrical part surrounding the other axial end, and a flow pass formed in the second mold and having a penetrating part penetrating from an inner peripheral surface to an outer peripheral surface of the cylindrical part and circulating the liquid rubber flowed out from the other axial end.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a mold, a rubber roll manufacturing apparatus, and a rubber roll manufacturing method.

  In Patent Literature 1, a first mold (cylindrical mold) in which a liquid rubber is injected between one end in the axial direction and the core material is formed into a cylindrical shape surrounding the core material (core metal), and the first A mold is disclosed that includes a second mold (upper mold) that is attached to the other axial end portion of one mold and has a cylindrical portion surrounding the other axial end portion of the first mold.

JP 2013-208888 A

  In a mold such as Patent Document 1, for example, liquid rubber injected from one axial end of the first mold flows out from the other axial end of the first mold, and the liquid rubber that flows out is visually recognized. There is a method for confirming that the liquid rubber is filled in the first mold.

  Here, in the configuration in which the liquid rubber flowing out from the other axial end portion of the first mold is circulated only in the groove formed along the axial direction on the inner peripheral surface of the second mold cylindrical portion, the first mold It is confirmed that the liquid rubber is filled in the first mold by visually recognizing the liquid rubber protruding from between the one end portion in the axial direction of the cylinder portion.

  In the present invention, compared to a configuration in which the liquid rubber flowing out from the other axial end portion of the first mold is circulated only in the groove formed along the axial direction on the inner peripheral surface of the second mold cylindrical portion. It is an object of the present invention to shorten the length of the path until the liquid rubber that has flowed out from the other axial end of the mold reaches a position where it can be visually recognized.

  The invention of claim 1 is a cylindrical shape surrounding the core material, and a first mold in which liquid rubber is injected between the one axial end portion and the core material, and an axial other end portion of the first mold A second mold having a cylindrical portion mounted and surrounding the other axial end, and a through portion formed in the second mold and penetrating from the inner peripheral surface of the cylindrical portion to the outer peripheral surface; A flow path for circulating the liquid rubber flowing out from the other end.

  According to a second aspect of the present invention, the penetrating portion is a cutout portion that opens to the one axial end side.

  In the invention according to claim 3, the inner wall surface of the cutout portion has no corner when viewed from the outer peripheral surface side of the cylindrical portion.

  According to a fourth aspect of the present invention, the cutout portion has an inner wall surface formed in a U shape when viewed from the outer peripheral surface side of the cylindrical portion.

  According to a fifth aspect of the present invention, the penetrating portion is a hole penetrating from the inner peripheral surface of the cylindrical portion to the outer peripheral surface.

  In the invention of claim 6, the hole is a circular hole.

  In the invention of claim 7, the flow path is formed along the axial direction on the inner peripheral surface of the cylindrical portion, and the liquid rubber flowing out from the other axial end is circulated to the axial one end, A groove communicating with the penetrating portion is provided at the downstream end in the flow direction.

  In the invention of claim 8, the groove width of the groove is narrower than the width of the through portion in the direction along the groove width.

  The invention according to claim 9 has a plurality of flow passages that are formed in the second mold and allow the liquid rubber flowing out from the other axial end portion to circulate, and a part of the plurality of flow passages is the flow passage. It is.

  According to a tenth aspect of the present invention, one of the plurality of flow passages is the flow path.

  The invention according to claim 11 is a cylindrical shape surrounding the core material, and a first mold in which liquid rubber is injected between the axial end portion and the core material, and an axially other end portion of the first mold A second mold having a cylindrical portion mounted and surrounding the other axial end portion, and a liquid rubber formed in the second mold and flowing out from the other axial end portion is circulated, and the liquid rubber is passed through the cylindrical portion. And a flow path exposed to the outer peripheral surface side.

  The invention of claim 12 is characterized in that the mold according to any one of claims 1 to 11 and the liquid rubber that has flowed out from the other end in the axial direction flow into the penetrating part. An injection part that injects liquid rubber between the first mold and the core material from the one axial end side of the first mold, and a heating part that heats and cures the liquid rubber.

  In the invention of claim 13, the axial direction one end side of the first mold in the mold is such that the volume of the liquid rubber flowing into the through section is equal to or less than the capacity of the through section. The liquid rubber is injected between the first mold and the core material.

  According to a fourteenth aspect of the present invention, a preparation step for preparing the mold according to any one of the first to eleventh aspects, and a liquid rubber flowing out from the other axial end of the mold flows into the through portion. As described above, an injection step of injecting liquid rubber between the first mold and the core material from the one axial end portion side of the first mold in the mold, and heating and curing the liquid rubber A heating step.

  The injection step according to claim 15, wherein the volume of the liquid rubber flowing into the through portion is equal to or less than the capacity of the through portion from the one end side in the axial direction of the first mold in the mold. Liquid rubber is injected between the mold and the core material.

  A sixteenth aspect of the invention includes a covering step that is performed before the injecting step and covers an outer peripheral surface facing the inner peripheral surface of the cylindrical portion in the first mold with a covering material.

  In the coating step according to claim 17, the coating material having an outer surface on which the cured liquid rubber is more easily attached than the second mold is used.

  In the invention of claim 18, the covering material has a release layer, and in the covering step, the covering material having an outer surface from which the release layer is peeled off is used.

  According to the configuration of the first aspect of the present invention, the liquid rubber that has flowed out from the other axial end portion of the first die only by the groove formed along the axial direction on the inner peripheral surface of the cylindrical portion of the second die. Compared with the structure which distribute | circulates, the length of the path | route until the liquid rubber which flowed out from the axial direction other end part of the 1st type | mold reaches | attains the position which can be visually recognized can be shortened.

  According to the structure of Claim 2 of this invention, compared with the structure where the axial direction one end part side of the penetration part closed, it is easy to remove the liquid rubber which flowed into the notch part from the 2nd type | mold.

  According to the configuration of the third aspect of the present invention, the liquid rubber that has flowed into the notch is easier to remove from the second mold than the configuration in which the inner wall surface of the notch has a corner when viewed from the outer peripheral surface side of the tube. .

  According to the configuration of the fourth aspect of the present invention, the liquid rubber that has flowed into the notch portion is compared with the case where the inner wall surface of the notch portion is formed in a V shape when viewed from the outer peripheral surface side of the cylindrical portion. Easy to remove from the mold.

  According to the structure of Claim 5 of this invention, compared with the structure which the axial direction one end part side of a penetration part opens, the liquid rubber which flowed into the penetration part does not flow easily to the axial direction one end part side of a 1st type | mold.

  According to the structure of Claim 6 of this invention, compared with the structure which is a square-shaped hole, it is easy to remove the liquid rubber which flowed into the hole from the 2nd type | mold.

  According to the configuration of claim 7 of the present invention, the internal pressure of the first mold is maintained high when the liquid rubber is injected between the first mold and the core material, as compared with the configuration in which the flow path has only the through portion. it can.

  According to the configuration of the eighth aspect of the present invention, the liquid rubber is injected between the first mold and the core material as compared with the configuration in which the groove width is equal to or larger than the width in the direction along the groove width of the through portion. When this is done, the internal pressure of the first mold can be kept high.

  According to the configuration of the ninth aspect of the present invention, the number of flow passages visually recognized to confirm that the liquid rubber is filled in the first mold is larger than when all of the plurality of flow passages are flow paths. Less is enough.

  According to the configuration of the tenth aspect of the present invention, the number of flow passages visually recognized to confirm that the liquid rubber is filled in the first mold is larger than when the plurality of flow passages have a plurality of flow passages. Less is enough.

  According to the structure of the eleventh aspect of the present invention, the liquid rubber that has flowed out from the other axial end portion of the first mold only by the groove formed along the axial direction on the inner peripheral surface of the cylindrical portion of the second mold. Compared with the structure which distribute | circulates, the length of the path | route until the liquid rubber which flowed out from the axial direction other end part of the 1st type | mold reaches | attains the position which can be visually recognized can be shortened.

  According to the structure of Claim 12 of this invention, the liquid rubber which flowed out from the axial direction other end part of the 1st type | mold only by the groove | channel formed in the inner peripheral surface of the cylinder part of the 2nd type along the axial direction. Compared with the structure which distribute | circulates, the length of the path | route until the liquid rubber which flowed out from the axial direction other end part of the 1st type | mold reaches | attains the position which can be visually recognized can be shortened.

  According to the configuration of the thirteenth aspect of the present invention, the liquid rubber adheres to the outer peripheral surface of the first mold as compared with the configuration in which the volume of the liquid rubber flowing into the penetration portion of the injection portion exceeds the capacity of the penetration portion. Can be suppressed.

  According to the method of the fourteenth aspect of the present invention, the liquid rubber that has flowed out from the other axial end portion of the first mold only by the groove formed along the axial direction on the inner peripheral surface of the cylindrical portion of the second mold. Compared with the case where it distribute | circulates, the length of the path | route until the liquid rubber which flowed out from the axial direction other end part of the 1st type | mold arrives at the position which can be visually recognized can be shortened.

  According to the method of the fifteenth aspect of the present invention, it is possible to suppress the liquid rubber from adhering to the outer peripheral surface of the first mold as compared with the case where the volume of the liquid rubber flowing into the through portion exceeds the capacity of the through portion.

  According to the method of the sixteenth aspect of the present invention, compared to the case where the outer peripheral surface of the first mold is directly opposed to the inner peripheral surface of the cylindrical portion, the liquid rubber flowing through the flow path adheres to the outer peripheral surface of the first mold. This can be suppressed.

  According to the method of the seventeenth aspect of the present invention, the liquid rubber that has flowed into the penetrating portion is secondly compared to the case where the liquid rubber after curing is more likely to adhere to the outer surface of the covering material than the second mold. Easy to remove from mold.

  According to the method of the eighteenth aspect of the present invention, it is easier to remove the liquid rubber that has flowed into the through portion from the second mold than when the release layer is provided on the entire outer surface of the covering material.

It is a disassembled perspective view which shows the structure of the manufacturing apparatus of the rubber roll which concerns on this embodiment. It is an exploded sectional view showing the composition of the rubber roll manufacturing device concerning this embodiment. It is sectional drawing which shows the structure of the manufacturing apparatus of the rubber roll which concerns on this embodiment. It is a perspective view which shows the rubber roll manufactured with the manufacturing apparatus of the rubber roll which concerns on this embodiment. It is a perspective view which shows the structure of the upper metal mold | die which concerns on this embodiment. It is sectional drawing which shows the structure of the upper metal mold | die which concerns on this embodiment. It is a perspective view which shows the structure of the upper metal mold | die which concerns on a modification. It is sectional drawing which shows the structure of the upper metal mold | die which concerns on a modification. It is sectional drawing which shows the structure of the upper metal mold | die which concerns on a modification.

  Below, an example of an embodiment concerning the present invention is described based on a drawing.

(Rubber roll manufacturing apparatus 100)
A rubber roll manufacturing apparatus 100 according to this embodiment will be described. 1, 2 and 3 show the configuration of a rubber roll manufacturing apparatus 100 (hereinafter simply referred to as “manufacturing apparatus 100”).

  The manufacturing apparatus 100 is an apparatus that manufactures a rubber roll 200 (see FIG. 4). Specifically, as shown in FIGS. 1, 2, and 3, the manufacturing apparatus 100 includes a mold 10, an injection unit 80 (see FIG. 3), a heater 50 as an example of a heating unit, It has. Hereinafter, specific configurations of the rubber roll 200, the mold 10, the injection unit 80, and the heater 50, which are manufacturing targets of the manufacturing apparatus 100, will be described.

(Rubber roll 200)
The rubber roll 200 includes a cored bar 202 as an example of a core material, a rubber layer 204, and a tube 206 as an example of a coating material.

  The cored bar 202 is cylindrical. A notch 203 for mounting a gear (not shown) is formed at the upper end of the cored bar 202. The rubber roll 200 having a gear (not shown) attached to the notch 203 is used as a driving roll that rotates by receiving a driving force from a driving motor through the gear. When the rubber roll 200 is not used as the drive roll, the notch 203 is not necessary.

  The rubber layer 204 is formed in a cylindrical shape formed on the outer periphery on the axial center side of the cored bar 202. That is, both end portions in the axial direction of the metal core 202 protrude outward in the axial direction from the rubber layer 204 and both end portions in the axial direction.

  The tube 206 is formed in a cylindrical shape. The tube 206 is covered on the outer periphery of the rubber layer 204. A release layer is formed on the outer peripheral surface 206 </ b> B of the tube 206. Specifically, for example, the outer peripheral surface 206B of the tube 206 is subjected to surface processing (fluorine resin coating) with a fluororesin.

  On the inner peripheral surface 206A of the tube 206, the release layer is peeled off. Specifically, for example, by irradiating a laser such as an excimer laser to the inner peripheral surface 206A whose surface is processed with a fluororesin, the fluororesin is peeled off to modify the inner peripheral surface 206A. On the inner peripheral surface 206 </ b> A of the tube 206, the cured rubber is more easily attached than the upper mold 14 </ b> A described later of the mold 10.

(Mold 10)
The mold 10 is a mold for molding the rubber layer 204 of the rubber roll 200. In a state where the core metal 202 is mounted inside the mold 10, unvulcanized rubber (thermosetting liquid rubber) as an example of liquid rubber is injected into the mold 10 to form a rubber layer 204. The The mold 10 is formed of a metal such as stainless steel, for example.

  Specifically, as shown in FIGS. 1, 2, and 3, the mold 10 includes a cylindrical mold 12 as an example of a first mold and an upper mold 14 </ b> A as an example of a second mold. And a lower mold 14B. Hereinafter, specific configurations of the cylindrical mold 12, the upper mold 14A, and the lower mold 14B will be described. Hereinafter, the upper mold 14A and the lower mold 14B may be collectively referred to as the upper and lower molds 14.

(Cylindrical mold 12)
The cylindrical mold 12 has a cylindrical shape surrounding the core metal 202 (see FIGS. 1 and 3). Specifically, the cylindrical mold 12 has a cylindrical shape surrounding the cylindrical cored bar 202 coaxially.

  The axial length of the cylindrical mold 12 is also shorter than the axial length of the core metal 202. The inner diameter of the cylindrical mold 12 is larger than the outer diameter of the core metal 202.

  In a state where the cored bar 202 is attached to the mold 10, both axial ends of the cored bar 202 protrude from both ends of the cylindrical mold 12. Further, in a state where the core metal 202 is attached to the mold 10, a cylindrical shape (annular) is formed between the outer wall (outer peripheral surface) 202 </ b> B of the core metal 202 and the inner wall (inner peripheral surface) 12 </ b> A of the cylindrical mold 12. ) Space S1 is formed. This space S1 is a filling space filled with unvulcanized rubber (thermosetting liquid rubber).

  For the cylindrical mold 12, unvulcanized rubber is injected into a space S <b> 1 between one end (lower end) in the axial direction and the core metal 202 through an inlet 18 described later of the lower mold 14 </ b> B.

(Lower mold 14B)
The lower mold 14 </ b> B is a mold that is attached to one axial end (lower end) of the cylindrical mold 12. The lower mold 14B has a name with “lower”, but the method of using the mold 10 is limited to the case where the mold 10 is used with the lower mold 14B facing downward. Is not something

  The lower mold 14B is formed in a cylindrical shape as shown in FIGS. A fitting hole 17B into which the lower end portion (one axial end portion) of the core metal 202 is fitted is formed in the lower end side (one axial end side) of the lower die 14B. By fitting the lower end portion of the cored bar 202 into the fitting hole 17B, the lower mold 14B holds the lower end part of the cored bar 202.

  A fitting hole 17A into which the lower end portion (one axial end portion) of the cylindrical die 12 is fitted is formed inside the upper end side (the other axial end side) of the lower die 14B. The lower mold 14 </ b> B is attached to the lower end of the cylindrical mold 12 by fitting the lower end of the cylindrical mold 12 into the insertion hole 17 </ b> A.

  The lower mold 14B has a facing surface 17C that faces the end surface 12C on the lower end side of the cylindrical mold 12 in a state where the lower end of the cylindrical mold 12 is fitted into the fitting hole 17A. ing. On the inner edge of the facing surface 17C, a groove portion 17D is formed in which an O-ring 21 as a sealing member for sealing between the lower mold 14B and the core metal 202 is mounted.

  Furthermore, the injection port 18 for inject | pouring unvulcanized rubber is formed in the radial direction outer side in the insertion hole 17B of the lower metal mold | die 14B. The inlet 18 communicates with the space (filling space) S1 between the outer wall 202B of the cored bar 202 and the inner wall 12A of the cylindrical mold 12 when the upper and lower molds 14 are attached to the cylindrical mold 12. It has become. Therefore, liquid rubber is injected into the cylindrical mold 12 between the lower end portion and the core metal 202. The lower mold 14B is provided with a shutter 28 as an opening / closing part that can open and close the injection port 18.

  In the mold 10, an annular (ring-shaped) plate member 27 is inserted between the opposing surface 17 </ b> C of the lower mold 14 </ b> B and the end surface 12 </ b> C on the other axial end side of the cylindrical mold 12. Yes. The plate member 27 has a gap (groove) (not shown) that allows the unvulcanized rubber injected from the injection port 18 to pass through the space S1.

  The cored bar 202 is inserted into the mold 10 (lower mold 14B) from below.

(Upper die 14A)
The upper die 14 </ b> A is a die attached to the other axial end portion (upper end portion) of the cylindrical die 12. The upper mold 14A has a name “up”, but the mold 10 can be used only when the mold 10 is used with the upper mold 14A facing upward. It is not something that can be done.

  As shown in FIGS. 1, 2, and 3, the upper mold 14 </ b> A includes an upper mold main body portion 15 as an example of a cylindrical portion, and a protruding portion 16 that protrudes upward from the upper mold main body portion 15. have.

  The upper mold body 15 is formed in a cylindrical shape surrounding the cylindrical mold 12. A fitting hole 15 </ b> F into which the upper end portion (the other end portion in the axial direction) of the cylindrical mold 12 is fitted is formed in the lower end side (the one end side in the axial direction) of the upper mold main body portion 15. The upper mold 14 </ b> A is mounted on the upper end of the cylindrical mold 12 by fitting the upper end of the cylindrical mold 12 into the fitting hole 15 </ b> F of the upper mold main body 15.

  The upper mold main body 15 has an inner peripheral surface that contacts the tube 206 that covers the outer peripheral surface 12D of the cylindrical mold 12 in a state where the upper end of the cylindrical mold 12 is fitted into the fitting hole 15F. 15A. In other words, the inner peripheral surface 15 </ b> A contacts the outer peripheral surface 12 </ b> D covered with the tube 206 of the cylindrical mold 12. In other words, the inner peripheral surface 15A is in contact with the outer peripheral surface 12D of the cylindrical mold 12 through the tube 206.

  Further, the upper mold main body 15 is formed on the tube 206 that partially covers the upper end surface 12B of the cylindrical mold 12 in a state where the upper end of the cylindrical mold 12 is fitted into the fitting hole 15F. It has the contact surface 15C which contacts. In other words, the contact surface 15 </ b> C contacts the upper end surface 12 </ b> B covered with the tube 206 of the cylindrical mold 12. In other words, the contact surface 15 </ b> C contacts the upper end surface 12 </ b> B of the cylindrical mold 12 via the tube 206.

  A concave portion 15D (see FIG. 2) in which an O-ring 19 as a sealing member for sealing between the upper mold 14A and the core metal 202 is mounted is formed on the inner edge of the contact surface 15C. The O-ring 19 prevents the unvulcanized rubber filled in the space S <b> 1 from leaking upward from between the upper mold 14 </ b> A and the core metal 202.

  The protrusion 16 is formed in a cylindrical shape. Specifically, the protruding portion 16 protrudes coaxially from the upper end of the upper mold body portion 15 upward (outside in the axial direction of the upper mold body portion 15).

  A fitting hole 16 </ b> A into which the upper end portion of the cored bar 202 is fitted is formed inside the protruding portion 16. The hole diameter of the fitting hole 16A is smaller than the hole diameter of the fitting hole 15F. Further, the fitting hole 16A and the fitting hole 15F are connected via a recess 15D. The upper die 14 </ b> A holds the upper end of the cored bar 202 by fitting the upper end of the cored bar 202 into the fitting hole 16 </ b> A of the protruding part 16.

(Flow path 20)
As shown in FIGS. 5 and 6, the upper mold 14 </ b> A is formed with a plurality of flow passages 20 through which the unvulcanized rubber flowing out from the upper end portion of the cylindrical mold 12 flows. The flow path 20 also functions as a gas vent for venting gas as the unvulcanized rubber is injected into the space S1.

  For example, a plurality of flow passages 20 are arranged at equal intervals along the circumferential direction of the upper mold body 15. Specifically, four flow passages 20 are arranged at equal intervals (at intervals of 90 degrees) along the circumferential direction of the upper mold body 15. 5 and 6, three of the four flow paths 20 are illustrated.

  In the present embodiment, all of the four flow paths 20 are each configured by a flow path 40. The flow path 40 includes a first groove 41, a second groove 42 as an example of a groove, and a notch 44 as an example of a through portion.

  The first groove 41 is formed on the contact surface 15 </ b> C of the upper mold body 15 along the radial direction of the upper mold body 15. In other words, the first groove 41 is formed on the contact surface 15 </ b> C of the upper mold main body portion 15 from the inner peripheral side of the upper mold main body portion 15 toward the outer peripheral side. Specifically, the first groove 41 extends from the inner peripheral surface 15E of the recess 15D to the inner peripheral surface 15A of the upper mold main body portion 15. The first groove 41 guides the unvulcanized rubber flowing out from the upper end of the cylindrical mold 12 toward the radially outer side of the upper mold main body 15. That is, the first groove 41 circulates the unvulcanized rubber flowing out from the upper end portion of the cylindrical mold 12 toward the radially outer side of the upper mold main body portion 15. The lower opening of the first groove 41 is closed by the upper end surface 12B covered with the tube 206 of the cylindrical mold 12 to form a flow path. That is, the upper end surface 12B constitutes a part of the inner wall of the flow path.

  Note that the radial direction of the upper mold body 15 is a crossing direction that intersects (specifically, orthogonal) with the axial direction of the upper mold body 15.

  The second groove 42 is formed on the inner peripheral surface 15 </ b> A of the upper mold body 15 along the axial direction of the upper mold body 15. In other words, the second groove 42 is formed on the inner peripheral surface 15 </ b> A of the upper mold body 15 from the upper side to the lower side of the upper mold body 15. The second groove 42 reaches the intermediate portion in the axial direction from the upper end of the inner peripheral surface 15 </ b> A of the upper mold main body 15, but does not reach the lower end of the inner peripheral surface 15 </ b> A of the upper mold main body 15. The upper end (upstream end in the flow direction) of the second groove 42 communicates with the downstream end of the first groove 41 in the flow direction.

  The second groove 42 is formed by removing unvulcanized rubber that has passed through the first groove 41 radially outward of the upper mold body 15 along the axial direction of the upper mold body 15. Guide toward the lower end side (lower side). That is, the second groove 42 is formed by removing unvulcanized rubber that has passed through the first groove 41 outward in the radial direction of the upper mold body 15 along the axial direction of the upper mold body 15. It circulates toward the lower end part side (lower side). The opening of the second groove 42 is closed by the outer peripheral surface 12D covered with the tube 206 of the cylindrical mold 12 to form a flow path. That is, the outer peripheral surface 12D constitutes a part of the inner wall of the flow path.

  The unvulcanized rubber flows through the first groove 41 and the second groove 42 while receiving a flow resistance in which the internal pressure in the space S1 is maintained at a predetermined internal pressure. That is, the 1st groove | channel 41 and the 2nd groove | channel 42 give the distribution | circulation resistance by which the internal pressure in space S1 is maintained at the predetermined internal pressure with respect to the unvulcanized rubber which distribute | circulates (flows).

  In other words, in the present embodiment, the first groove is such that the unvulcanized rubber flows through the first groove 41 and the second groove 42 in a state where the internal pressure in the space S1 is maintained at a predetermined internal pressure. The groove width and groove depth of 41 and the second groove 42 are set. The groove width and groove depth of the first groove 41 and the second groove 42 are, for example, the same.

  The notch 44 penetrates from the inner peripheral surface 15A of the upper mold body 15 to the outer peripheral surface 15B. That is, the notch 44 is open to the outside in the radial direction of the upper mold body 15. The notch 44 is also open to the lower end side (lower side) of the cylindrical mold 12. The notch 44 communicates with the downstream end (lower end) of the second groove 42. Thereby, the unvulcanized rubber flowing through the second groove 42 flows into the notch 44.

  The width of the notch 44 (the width along the circumferential direction of the upper mold main body 15) is wider than the groove width of the first groove 41 and the second groove 42. That is, the groove widths of the first groove 41 and the second groove 42 are narrower than the width of the notch 44.

  The inner wall surface of the cutout portion 44 does not have a corner when viewed from the outer peripheral surface side of the upper mold main body portion 15. Specifically, the cutout portion 44 has an inner wall surface formed in a U shape when viewed from the outer peripheral surface side of the upper mold main body portion 15. Note that the U-shape is a shape including an arc-shaped portion and a linear portion extending from each of two ends of the arc-shaped portion.

  The notch 44 has a function of exposing the inflowed unvulcanized rubber to the outer peripheral surface side of the upper mold body 15. That is, the flow path 40 is a flow path for allowing the unvulcanized rubber to flow to a position where the unvulcanized rubber is exposed to the outer peripheral surface side of the upper mold main body 15.

  In other words, the cutout portion 44 has a function of making unvulcanized rubber visible from the outer peripheral surface side of the upper mold main body portion 15. That is, the flow path 40 is a flow path for allowing the unvulcanized rubber to flow to a position where the unvulcanized rubber is visually recognized from the outer peripheral surface side of the upper mold body 15.

(Injection unit 80)
The injection part 80 shown in FIG. 3 is an example of an injection part that injects unvulcanized rubber from the lower end of the cylindrical mold 12 into the space S1 between the cylindrical mold 12 and the core metal 202. Specifically, the injection unit 80 injects unvulcanized rubber into the space S1 through the injection port 18 of the lower mold 14B.

  The injection unit 80 injects an unvulcanized rubber in an amount larger than the capacity of the circulation space in which the unvulcanized rubber flows from the injection port 18 to the second groove 42 of the flow path 40. In other words, the injection part 80 injects the unvulcanized rubber flowing out from the upper end part of the cylindrical mold 12 so as to flow into the notch part 44.

  The injection part 80 injects the unvulcanized rubber in an amount equal to or less than the capacity of the circulation space through which the unvulcanized rubber flows from the injection port 18 to the notch 44 of the flow path 40. In other words, the injection unit 80 injects the unvulcanized rubber flowing out from the upper end of the cylindrical mold 12 so that the volume of the unvulcanized rubber flowing into the cutout 44 is equal to or less than the volume of the cutout 44. In addition, the injection | pouring part 80 has liquid feeding parts, such as a pump which liquid-feeds unvulcanized rubber, for example, and is comprised.

(Heater 50)
The heater 50 shown in FIGS. 1, 2, and 3 is an apparatus that heats and cures unvulcanized rubber. In the present embodiment, the heater 50 heats unvulcanized rubber through the cored bar 202. Specifically, the heater 50 is composed of, for example, a rod-shaped electric heating pipe heater. The heater 50 heats the unvulcanized rubber through the cored bar 202 when the outer peripheral surface is in contact with the inner peripheral surface of the cored bar 202. A heating wire (not shown) is inserted in the heater 50, and an electric wire 50 </ b> A is connected to the heating wire at the upper end of the heater 50. In addition, a thermocouple 50 </ b> B for measuring the temperature of the heater 50 is attached to the heater 50. In the heater 50, the temperature of the heater 50 is measured by the thermocouple 50B, and the heating temperature of the unvulcanized rubber is adjusted.

(Rubber roll manufacturing method)
Next, a rubber roll manufacturing method will be described.

  This manufacturing method is a manufacturing method for manufacturing the rubber roll 200 by using the rubber roll manufacturing apparatus 100 described above. Specifically, the manufacturing method includes a preparation process, a mounting process, an injection process, a heating process, and a cleaning process. In this manufacturing method, each process is performed in the order of a preparation process, a mounting process, an injection process, a heating process, and a cleaning process.

(Preparation process)
In the preparation step, a rubber roll manufacturing apparatus 100 including the mold 10 is prepared.

(Installation process)
The mounting process includes a tube mounting process as an example of a covering process and a core metal mounting process.

  In the tube mounting step, the tube 206 is mounted on the cylindrical mold 12. Specifically, for example, the tube 206 is attached as follows.

  First, the tube 206 is inserted into the cylindrical mold 12 so that both ends of the tube 206 protrude from both ends of the cylindrical mold 12. Then, the protruding portions protruding from both ends of the cylindrical mold 12 at both ends of the tube 206 are folded back to the outer peripheral surfaces (outer walls) 12D at both ends of the cylindrical mold 12, so that the tube 206 is made to the cylindrical mold 12. Is installed.

  As a result, the outer peripheral surface of the cylindrical mold 12 facing the inner peripheral surface of the upper mold main body 15 is covered with the tube 206. Further, since the tube 206 is folded back, the inner peripheral surface 206 </ b> A (an example of the outer surface) of the tube 206 faces the inner peripheral surface of the upper mold main body 15.

  As described above, the inner peripheral surface 206A of the tube 206 is a surface from which the release layer is peeled off. Further, the inner peripheral surface 206A of the tube 206 is a surface on which the cured rubber is more easily attached than an upper mold 14A described later of the mold 10.

  In the core metal mounting step, the core metal 202 is mounted on the mold 10 including the cylindrical mold 12 to which the tube 206 is mounted. Specifically, for example, the cored bar 202 is attached as follows.

  The core metal 202 is inserted from the fitting hole 17B side (downward) of the lower mold 14B, the core metal 202 is mounted on the lower mold 14B, and then the cylindrical mold 12 to which the tube 206 is mounted and The upper mold 14A is mounted on the core metal 202 from above the core metal 202 in this order.

  In this manufacturing method, the space (filling space) S1 filled with the unvulcanized rubber is formed by attaching the tube 206 to the cylindrical mold 12 so that the outer wall 202B of the core metal 202 and the inner periphery of the tube 206 are filled. It is formed between the surface 206A.

(Injection process)
In the injection process, in the state where the shutter 28 is opened, the injection unit 80 injects unvulcanized rubber into the space S1 through the injection port 18 of the lower mold 14B. Thereby, the unvulcanized rubber is filled in the space (filling space) S1 between the core metal 202 and the tube 206.

  Specifically, the injection unit 80 injects the unvulcanized rubber flowing out from the upper end of the cylindrical mold 12 so as to flow into the notch 44. In the injection step, unvulcanized rubber for a preset injection time (injection amount) is injected.

  The operator visually confirms whether or not unvulcanized rubber flows into the notch 44. Further, the operator visually confirms whether the amount of the unvulcanized rubber that has flowed into the notch 44 is an appropriate amount. Specifically, it is visually confirmed whether or not the unvulcanized rubber that has flowed into the notch 44 overflows from the notch 44.

  It is confirmed that the unfilled rubber is filled in the space S <b> 1 by visually confirming the inflow of the unvulcanized rubber into the notch 44. When the worker cannot visually recognize the inflow of the unvulcanized rubber into the cutout portion 44, the worker changes the setting of the injection time (injection amount) in the next injection process. That is, the operator lengthens (increases) the injection time (injection amount) in the next injection process.

  When the amount of unvulcanized rubber that has flowed into the notch 44 overflows from the notch 44, the operator changes the setting of the injection time (injection amount) in the next injection process. That is, the operator shortens (decreases) the injection time (injection amount) in the next injection process.

(Heating process)
In the heating step, the heater 50 is inserted into the inner space of the cored bar 202, the heater 50 is brought into contact with the inner wall (inner peripheral surface) 202A of the cored bar 202, and the cored bar 202 is heated from the inside.

  Specifically, in the heating step, the unvulcanized rubber is heated to a first temperature (for example, 100 ° C. to 160 ° C.) to be in a solid state, and the solidification step results in a solid state. A vulcanization step of vulcanizing the unvulcanized rubber by heating at a second temperature (for example, 190 ° C.) higher than the first temperature.

  Thus, the unvulcanized rubber is cured by heating the unvulcanized rubber. The unvulcanized rubber that has flowed into the notch 44 of the upper mold 14A is also cured.

  When the unvulcanized rubber is cured to become vulcanized rubber (elastic rubber), the upper and lower molds 14 are removed from the cylindrical mold 12, and the core metal 202 on which vulcanized rubber (elastic rubber) is formed is made of gold. Remove from mold 10. Thus, the rubber roll 200 (resin tube coating roll) with which the tube 206 was coat | covered is manufactured. In addition, the tube 206 that protrudes outward in the axial direction from both axial ends of the rubber layer 204 of the rubber roll 200 is cut, and the cut tube 206 is discarded together with the rubber attached to the tube 206.

(Cleaning process)
In the cleaning process, the mold 10 is cleaned. Specifically, in the cleaning process, the mold 10 is disassembled, and the unvulcanized rubber cured at the notch 44 of the upper mold 14A is removed.

(Operation of this embodiment)
In the present embodiment, the injection portion 80 shown in FIG. 3 passes through the injection port 18 of the lower die 14B and enters the space S1 between the core metal 202 and the tube 206 from the lower end portion of the cylindrical die 12 into the unvulcanized rubber. (See the above-described implantation step).

  The unvulcanized rubber injected into the space S1 from the lower end portion of the cylindrical mold 12 circulates in the space S1 toward the upper end portion of the cylindrical mold 12, and is filled in the space S1. The unvulcanized rubber filled in the space S <b> 1 flows out from the upper end portion of the cylindrical mold 12 to the outside of the cylindrical mold 12.

  The unvulcanized rubber that has flowed out from the upper end of the cylindrical mold 12 to the outside of the cylindrical mold 12 causes the first groove 41, the second groove 42, and the notch 44 of each flow path 40 shown in FIG. Circulate in order. In the first groove 41, the unvulcanized rubber flows toward the radially outer side of the upper mold body 15. In the second groove 42, the unvulcanized rubber flows along the axial direction of the upper mold body 15 toward the lower end side (lower side) of the cylindrical mold 12. Then, the unvulcanized rubber flowing through the second groove 42 flows into the cutout portion 44.

  The notch 44 penetrates from the inner peripheral surface 15A of the upper mold body 15 to the outer peripheral surface 15B. For this reason, the unvulcanized rubber inside the notch 44 is visually recognized by the operator from the outer peripheral side of the upper mold 14A. The operator visually confirms the unvulcanized rubber inside the notch 44, thereby confirming that the unvulcanized rubber is filled in the space S1.

  In addition, since the notch part 44 is opening to the lower end part side (lower side) of the cylindrical mold 12, the operator may visually recognize the unvulcanized rubber inside the notch part 44 from the lower side. .

  Here, for example, the notch 44 is not formed in the upper mold body 15, and the flow path 40 is replaced with the second groove 42 and the notch 44, and the inner peripheral surface 15 </ b> A of the upper mold body 15. In the configuration having a groove extending from the upper end to the lower end (comparative example), unvulcanized rubber is visually recognized as follows. That is, in the configuration of the comparative example, unvulcanized rubber that protrudes below the lower end portion of the upper mold main body portion 15 from between the cylindrical mold 12 and the lower end portion of the upper mold main body portion 15 is visually recognized. Is done. As described above, in the configuration of the comparative example, the unvulcanized rubber is not visually recognized unless the unvulcanized rubber reaches below the lower end portion of the upper mold body 15.

  On the other hand, in this embodiment, the unvulcanized rubber that has flowed into the notch 44 may be visually recognized. That is, the unvulcanized rubber is visually recognized at a position above the lower end portion of the upper mold main body portion 15. Therefore, according to the present embodiment, compared to the case of the comparative example, the path until the unvulcanized rubber flowing out from the upper end of the cylindrical mold 12 to the outside of the cylindrical mold 12 reaches a visible position. The length of is shortened.

  Thus, since the length of the path until the unvulcanized rubber reaches the position where it can be visually recognized becomes short, the time until the unvulcanized rubber reaches the position where it can be visually recognized from the inlet 18 is shortened. . For this reason, the injection | pouring time of unvulcanized rubber is shortened. As a result, the manufacturing time of the rubber roll is shortened, and the productivity of the rubber roll is improved.

  In addition, since it is only necessary to circulate unvulcanized rubber at a position above the lower end of the upper mold body 15, the unvulcanized rubber hangs below the tube 206 compared to the comparative example. Adhering to the outer peripheral surface 12D of the cylindrical mold 12 is suppressed. Even if the tube 206 is not covered, the range along the axial direction of the unvulcanized rubber adhering to the outer peripheral surface 12D of the cylindrical mold 12 is reduced. For this reason, the cylindrical mold 12 can be easily cleaned.

  In the present embodiment, as described above, the notch 44 opens to the lower end side (lower side) of the cylindrical mold 12, so that the operator can remove the unvulcanized rubber inside the notch 44. You may visually recognize from the lower side. For this reason, the worker may visually recognize the unvulcanized rubber from any one of the two directions, and the degree of freedom in the viewing direction is higher than when the worker can only visually recognize from one direction.

  Furthermore, since the notch 44 is also open to the lower end side (lower side) of the cylindrical mold 12, unvulcanized rubber (cured) that has flowed into the notch 44 compared to a configuration in which the lower side is closed. It is easy to remove the later rubber) from the upper mold 14A.

  Further, in the present embodiment, the cutout portion 44 has an inner wall surface that does not have a corner when viewed from the outer peripheral surface side of the upper mold main body portion 15. For this reason, compared with the structure in which the inner wall surface of the notch 44 has a corner when viewed from the outer peripheral surface side of the upper mold body 15, the uncured rubber is less likely to clog the corner (corner) inside the notch 44. The unvulcanized rubber (cured rubber) that has flowed into the notch 44 is easily removed from the upper mold 14A.

  Specifically, the cutout portion 44 has an inner wall surface formed in a U shape when viewed from the outer peripheral surface side of the upper mold main body portion 15. For this reason, compared with the case where the inner wall surface of the notch portion 44 is formed in a V shape when viewed from the outer peripheral surface side of the upper mold main body portion 15, the corner portion (corner portion) inside the notch portion 44 is not formed. The vulcanized rubber is hard to be clogged, and unvulcanized rubber (cured rubber) that has flowed into the notch 44 is easily removed from the upper mold 14A.

  In the present embodiment, the injecting portion 80 uses unvulcanized rubber so that the capacity of the unvulcanized rubber flowing out from the upper end portion of the cylindrical mold 12 into the notched portion 44 is equal to or less than the capacity of the notched portion 44. Inject into the mold 10. For this reason, compared with the case where the capacity of the unvulcanized rubber flowing into the notch 44 exceeds the capacity of the notch 44, the unvulcanized rubber is less likely to protrude below the lower end of the upper mold body 15; The adhesion of unvulcanized rubber to the outer peripheral surface 12D of the cylindrical mold 12 is suppressed.

  In the present embodiment, the outer peripheral surface of the cylindrical mold 12 that faces the inner peripheral surface of the upper mold main body 15 is covered with the tube 206 in the covering step before the injection step. Thereby, the tube 206 is opposed to the second groove 42 and the cutout portion 44 as a penetrating portion. For this reason, compared with the case where the outer peripheral surface of the cylindrical mold 12 directly opposes the inner peripheral surface of the upper mold main body portion 15, the unvulcanized rubber flowing through the second groove 42 and the cutout portion 44 is formed in the cylindrical mold. Adhesion to the outer peripheral surface of 12 is suppressed.

  In the present embodiment, since the release layer is peeled off from the inner peripheral surface 206A of the tube 206 facing the inner peripheral surface of the upper mold main body 15, the cured rubber is used as the upper mold main body 15. It is easier to adhere to the tube 206 than the inner peripheral surface. For this reason, it is easy to remove unvulcanized rubber (cured rubber) flowing into the cutout portion 44 from the upper mold 14A.

  In the present embodiment, the flow path 40 includes a first groove 41 and a second groove 42 that do not penetrate the upper mold body 15. For this reason, for example, compared with the case where the flow path 40 does not have the second groove 42 and is configured by the first groove 41 and the cutout portion 44, the cylindrical metal when the unvulcanized rubber is injected into the space S1. The internal pressure of the mold 12 is kept high.

  In the present embodiment, the groove widths of the first groove 41 and the second groove 42 are narrower than the width of the notch 44. For this reason, compared with the structure where the groove width of the 1st groove | channel 41 and the 2nd groove | channel 42 is more than the width | variety of the notch part 44, the internal pressure of the cylindrical metal mold | die 12 at the time of inject | pouring unvulcanized rubber in space S1 is large. Highly maintained.

  In this way, since the internal pressure of the cylindrical mold 12 when the unvulcanized rubber is injected into the space S1 is maintained high, shape defects that partially reduce the outer diameter of the manufactured rubber layer 204 are suppressed. Is done.

(Flow path 140 as a modification of the flow path 40)
As a flow path constituting the flow passage 20, a flow path 140 may be used instead of the flow path 40 as shown in FIGS. 7 and 8. The flow path 140 has a hole 144 as an example of a through portion instead of the above-described cutout portion 44. That is, the flow path 140 includes the first groove 41, the second groove 42, and the hole 144.

  The hole 144 penetrates from the inner peripheral surface 15A to the outer peripheral surface 15B of the upper mold body 15 at a position above the lower end of the upper mold body 15. That is, the hole 144 opens to the outer side in the radial direction of the upper mold body 15. The hole 144 is a circular hole having a circular shape when viewed from the outer peripheral side of the upper mold body 15.

  Unlike the cutout portion 44, the hole 144 does not open to the lower end side (lower side) of the cylindrical mold 12. That is, the hole 144 is closed with respect to the lower end side (lower side) of the cylindrical mold 12. The hole 144 communicates with the downstream end (lower end) of the second groove 42.

  The width (diameter) of the hole 144 is wider than the groove widths of the first groove 41 and the second groove 42. That is, the groove widths of the first groove 41 and the second groove 42 are narrower than the width (diameter) of the hole 144.

  The hole 144 is a circular hole formed in a circular shape when viewed from the outer peripheral surface side of the upper mold body 15. In other words, the hole 144 is a hole having no corners when viewed from the outer peripheral surface side of the upper mold body 15. The hole 144 has a function of exposing the unvulcanized rubber to the outer peripheral surface side of the upper mold main body 15.

  In the present modification, as described above, the hole 144 is closed with respect to the lower end side (lower side) of the cylindrical mold 12 in the flow path 140. For this reason, the unvulcanized rubber that has flowed into the hole 144 is less likely to flow to the lower end side (lower side) of the cylindrical mold 12 as compared with the configuration that opens to the lower end side (lower side) of the cylindrical mold 12.

  In addition, since the hole 144 is a circular hole, the unvulcanized rubber that has flowed into the hole 144 is less likely to clog the corners inside the hole 144 and the unflowed rubber that has flowed into the hole 144 is less than the rectangular hole. It is easy to remove the vulcanized rubber from the upper mold 14A.

(Other variations of flow paths 40 and 140)
Although the flow path 40 has the 1st groove | channel 41, the 2nd groove | channel 42, and the notch part 44, it is not restricted to this. Moreover, although the flow path 140 had the 1st groove | channel 41, the 2nd groove | channel 42, and the hole 144, it is not restricted to this.

  As an example of the flow path, a configuration without the first groove 41 may be used. That is, as an example of the flow path, a flow path constituted by the second groove 42 and the notch 44 (or the hole 144) may be used. In this case, the contact surface 15C of the upper mold main body 15 is formed in a planar shape, for example.

  Moreover, as an example of the flow path, a configuration without the second groove 42 may be used. That is, as an example of the flow path, a flow path constituted by the first groove 41 and the notch 44 (or the hole 144) may be used. In this case, for example, the notch 44 (or the hole 144) is configured to communicate with the downstream end of the first groove 41.

  Furthermore, as an example of the flow path, a configuration without the first groove 41 and the second groove 42 may be used. That is, as an example of the flow path, a flow path constituted by the notch 44 (or the hole 144) may be used.

  In the case of a flow path that does not have the second groove 42, the cutout portion 44 (or the hole 144) may be configured to reach from the upper end to the lower end of the inner peripheral surface 15 </ b> A of the upper mold main body portion 15.

  The inner wall surface of the cutout portion 44 is formed in a U shape when viewed from the outer peripheral surface side of the upper mold main body portion 15, but the shape of the inner wall surface of the cutout portion 44 is not limited thereto. For example, the shape of the inner wall surface of the notch 44 may be V-shaped or rectangular.

(Modification of flow passage 20)
In the above-described configuration, all of the four flow paths 20 are configured by the flow paths 40, but some of the four flow paths 20 may be configured by the flow paths 40. Therefore, a part of the four flow paths 20 and the plurality of flow paths 20 may be configured by the flow paths 40. In addition, one of the four flow paths 20 may be configured by the flow path 40.

  Of the four flow passages 20, the flow passages 20 other than the flow passage 40 are configured by, for example, a flow passage 70 as shown in FIG. 9. The flow path 70 has a first groove 71 and a second groove 72. Since the 1st groove | channel 71 is comprised similarly to the 1st groove | channel 41, description is abbreviate | omitted here.

  The second groove 72 is formed on the inner peripheral surface 15 </ b> A of the upper mold body 15 along the axial direction of the upper mold body 15. The second groove 72 reaches from the upper end to the lower end of the inner peripheral surface 15A of the upper mold body 15. Therefore, the axial length of the second groove 72 is longer than the axial length of the second groove 42 of the flow path 40. The upper end (the upstream end in the flow direction) of the second groove 72 communicates with the downstream end in the flow direction of the first groove 71. The groove width and groove depth of the first groove 71 and the second groove 72 are the same. The second groove 72 circulates the unvulcanized rubber flowing through the first groove 71 radially outward of the upper mold body 15 toward the lower end (lower side) of the cylindrical mold 12.

  According to the flow path 40, as described above, the length of the path until the unvulcanized rubber reaches a position where it can be visually recognized is shortened, so that the flow path 20 other than the flow path 40 (for example, the flow path 70). The unvulcanized rubber is visually recognized prior to the unvulcanized rubber flowing through. For this reason, in order to confirm that the unvulcanized rubber is filled in the space S <b> 1 of the cylindrical mold 12, the flow path 40 may be visually confirmed. Therefore, in the configuration in which a part of the four flow paths 20 is the flow path 40, the unvulcanized rubber is placed in the space S <b> 1 of the cylindrical mold 12 compared to the case where all of the plurality of flow paths 20 are the flow paths 40. The number of flow passages to be visually checked for confirming the filling is small.

  Furthermore, in the configuration in which one of the four flow paths 20 is the flow path 40, the unvulcanized rubber is a cylindrical mold compared to the case where the four flow paths 20 have a plurality of flow paths 40. In order to confirm that the 12 spaces S1 are filled, the number of flow passages to be visually recognized is small.

  The present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements can be made. For example, the modification examples described above may be appropriately combined.

10 Mold 12 Cylindrical mold (example of first mold)
14A Upper mold (example of second mold)
20 flow path 40 flow path 42 second groove (an example of groove)
44 Notch (example of penetration)
50 Heater (example of heating section)
80 Injection unit 100 Rubber roll manufacturing apparatus 140 Channel 144 hole (an example of a penetration part)
202 Core (example of core material)
206 Tube (an example of a covering material)

Claims (18)

A first mold in which a liquid rubber is injected between the core material and a cylindrical shape surrounding the core material;
A second mold having a cylindrical portion attached to the other axial end of the first mold and surrounding the other axial end;
A flow path formed in the second mold, having a penetrating portion penetrating from the inner peripheral surface of the cylindrical portion to the outer peripheral surface, and flowing the liquid rubber flowing out from the other axial end portion;
Mold with. The penetrating portion is a notch that opens to the one end side in the axial direction.
The mold according to claim 1. The notch portion has an inner wall surface that does not have a corner when viewed from the outer peripheral surface side of the cylindrical portion.
The mold according to claim 2. As for the said notch part, the inner wall surface is formed in the U-shape seeing from the outer peripheral surface side of the said cylinder part,
The mold according to claim 3. The mold according to claim 1, wherein the penetrating portion is a hole penetrating from the inner peripheral surface of the cylindrical portion to the outer peripheral surface. The hole is a circular hole,
The mold according to claim 5. The flow path is
Liquid rubber formed along the axial direction on the inner peripheral surface of the cylindrical portion and flowing out from the other axial end is circulated to the one axial end, and communicates with the penetrating portion at the downstream end in the flow direction. The metal mold according to claim 1, wherein the mold has a groove. The mold according to claim 7, wherein a groove width of the groove is narrower than a width of the through portion in a direction along the groove width. A plurality of flow passages that are formed in the second mold and allow the liquid rubber flowing out from the other axial end portion to flow;
The mold according to any one of claims 1 to 8, wherein a part of the plurality of flow paths is the flow path. The mold according to claim 9, wherein one of the plurality of flow paths is the flow path. A first mold in which a liquid rubber is injected between the core material and a cylindrical shape surrounding the core material;
A second mold having a cylindrical portion attached to the other axial end of the first mold and surrounding the other axial end;
A flow path formed in the second mold, allowing the liquid rubber flowing out from the other axial end portion to flow, and exposing the liquid rubber to the outer peripheral surface side of the cylindrical portion;
Mold with. The mold according to any one of claims 1 to 11,
The liquid rubber flowing out from the other end in the axial direction flows between the first mold and the core material from the one end side in the axial direction of the first mold in the mold so that the liquid rubber flows into the through portion. An injection part for injecting rubber;
A heating unit for heating and curing the liquid rubber;
A rubber roll manufacturing apparatus comprising: The injection part is configured so that the volume of the liquid rubber flowing into the penetrating part is equal to or less than the capacity of the penetrating part from the one end side in the axial direction of the first mold in the mold. Inject liquid rubber between the core material,
The rubber roll manufacturing apparatus according to claim 12. A preparation step for preparing the mold according to any one of claims 1 to 11,
The first mold and the core material from the one axial end side of the first mold in the mold so that the liquid rubber flowing out from the other axial end of the mold flows into the penetrating part. An injection process for injecting liquid rubber between
A heating step of heating and curing the liquid rubber;
A rubber roll manufacturing method comprising: The injection step includes
Between the first mold and the core material from the one end side in the axial direction of the first mold in the mold so that the volume of the liquid rubber flowing into the through section is equal to or less than the capacity of the through section. Inject liquid rubber into
The method for producing a rubber roll according to claim 14. A covering step that is performed before the pouring step and covers the outer peripheral surface facing the inner peripheral surface of the cylindrical portion in the first mold with a covering material,
The rubber roll manufacturing method of Claim 14 or 15 provided with these. In the coating step,
Using the coating material having an outer surface on which liquid rubber after curing is more easily attached than the second mold,
The method for producing a rubber roll according to claim 16. The covering material has a release layer,
In the coating step,
Using the covering material having an outer surface from which the release layer is peeled off,
The rubber roll manufacturing method according to claim 16 or 17.