JP6841041B2 - Mold cleaning jig - Google Patents

Description

The present invention relates to a jig for cleaning a mold with a laser.

Tires are obtained by pressurizing and heating an unvulcanized low cover in a mold. At this time, the rubber composition of the low cover causes a cross-linking reaction in the mold. This cross-linking reaction involves the formation of by-products. Therefore, as the mold is used repeatedly, the cavity surface of the mold becomes dirty. This stain is cleaned regularly. Japanese Unexamined Patent Publication No. 2015-231672 discloses a jig for holding a mold when cleaning the mold with a laser. In this jig, the tread segment is cleaned.

JP 2015-231672

By cleaning different parts of the mold at once, the mold can be cleaned efficiently. These different parts include, for example, tread segments and side plates. However, cleaning the tread segment and side plate at the same time creates areas where it is difficult to irradiate the laser. Areas that are difficult to irradiate with a laser need to be cleaned separately.

An object of the present invention is to provide a jig capable of efficiently cleaning a tread segment and a side plate with a laser.

The cleaning jig according to the present invention is a jig that holds a mold having a large number of segments for forming a tread of a tire and a side plate for forming a sidewall of a tire when the mold is cleaned by a laser. is there.
This cleaning jig
The side plate jig that holds the side plate and
With a segment jig that holds the large number of segments in a ring shape by arranging them in the circumferential direction and positions the lower end of the cavity surface of each segment in the vertical direction above the outer edge in the radial direction of the cavity surface of the side plate. It has.

Preferably, the segment jig is detachably attached to the side plate jig.

Preferably, the segment jig holds the segment by positioning the inner peripheral contact surface of the segment in contact with the side plate above the radial outer end of the cavity surface of the side plate.

The mold cleaning method according to the present invention is a mold cleaning method in which a mold having a large number of segments for forming a tread of a tire and a side plate for forming a sidewall of a tire is cleaned with a laser.
This mold cleaning method includes a side plate mounting step, a segment mounting step, a jig assembly step, and a laser irradiation step.
In the side plate mounting step, the side plate is held by the side plate jig.
In the segment mounting step, a large number of the segments are arranged in the circumferential direction and held in a ring shape by the segment jig.
In the jig assembly step, the segment jig is placed on the side plate jig by positioning the lower end of the cavity surface of each segment in the vertical direction above the radial outer end of the cavity surface of the side plate. , The segment jig and the side plate jig are integrally assembled.
In the laser irradiation step, the laser is irradiated to the cavity surface of the segment and the cavity surface of the side plate in a state where the segment jig and the side plate jig are integrally assembled.

Preferably, in the side plate mounting step of this cleaning method, a suspension bolt is attached to a screw hole formed on the radial outer peripheral surface of the side plate, and the side plate is suspended by the suspension bolt to cure the side plate. It is placed on the tool.

In this cleaning method, the mold has a bead ring that forms the bead. Preferably, in the side plate mounting step, the bead ring is attached to the inside in the radial direction of the side plate to be mounted on the side plate jig.

Since the cleaning jig according to the present invention includes a side plate jig and a segment jig, the side plate and the segment can be cleaned at once. By using this cleaning jig, the mold can be efficiently cleaned with a laser. Further, in this cleaning jig, since the lower end of the cavity surface of the segment in the vertical direction is positioned above the side plate, the entire cavity surface of the segment and the cavity surface of the sidewall can be cleaned at once.

FIG. 1 is a plan view showing a cleaning jig according to an embodiment of the present invention together with a mold. FIG. 2 is a side view of the cleaning jig and the mold of FIG. FIG. 3 is a cross-sectional view taken along the line segments III-III of FIG. FIG. 4 is an explanatory view showing a usage state of the mold of FIG. FIG. 5 is a cross-sectional view showing the cleaning jig of the comparative example together with the mold.

Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the drawings as appropriate.

The cleaning jig 2 is shown in FIGS. 1 to 3. In FIGS. 1 to 3, a plurality of segments 4, side plates 6 and bead rings 8 are shown together. The plurality of segments 4, the side plate 6 and the bead ring 8 form a part of the mold 10 for forming the tire.

The vertical direction of FIGS. 2 and 3 is the vertical direction of the cleaning jig 2, the horizontal direction is the radial direction of the cleaning jig 2, and the direction perpendicular to the paper surface is the circumferential direction of the cleaning jig 2. The vertical direction of the cleaning jig 2 coincides with the axial direction of the mold 10. The radial and circumferential directions of the mold 10 coincide with the radial and circumferential directions of the cleaning jig 2.

The cleaning jig 2 includes a segment jig 12 and a side plate jig 14. The segment jig 12 holds a large number of segments 4 in a ring shape. The segment 4 is placed on the segment jig 12. The side plate jig 14 holds the ring-shaped side plate 6. The side plate 6 is placed on the side plate jig 14. In this cleaning jig 2, the ring-shaped center position formed by a large number of segments 4 and the center position of the ring-shaped side plate 6 coincide with each other in the radial direction.

As shown in FIG. 1, the segment jig 12 has a ring shape. As shown in FIG. 3, the segment jig 12 includes a convex portion 22 that projects inward in the radial direction. The segment jig 12 includes a bottom surface 16, a tapered surface 18, an inner peripheral surface 20, an inner peripheral surface 24, a first support surface 26, and a second support surface 28.

The bottom surface 16 is a downward facing surface. The bottom surface 16 is a flat surface that abuts on the side plate jig 14. The bottom surface 16 is a surface for vertically positioning the segment jig 12 with respect to the side plate jig 14.

The tapered surface 18 is a surface that extends from the lower side to the upper side so as to be inclined inward from the outer side in the radial direction. The tapered surface 18 is a surface that guides the segment jig 12 to a predetermined position with respect to the side plate jig 14 in the radial direction when the segment jig 12 is attached to the side plate jig 14.

The inner peripheral surface 20 is a surface facing inward in the radial direction. The inner peripheral surface 20 is located between the tapered surface 18 and the convex portion 22 in the vertical direction. The inner diameter D1 of the inner peripheral surface 20 is larger than the outer diameter Ds of the side plate 6.

The convex portion 22 is located above the inner peripheral surface 20. The convex portion 22 projects inward in the radial direction from the inner peripheral surface 20. The convex portion 22 extends around in the circumferential direction.

The inner peripheral surface 24 is formed at the inner end in the radial direction of the convex portion 22. The inner peripheral surface 24 is a surface facing inward in the radial direction. In this segment jig 12, the inner diameter D2 of the inner peripheral surface 24 is larger than the outer diameter Ds of the side plate 6. The inner diameter D2 of the inner peripheral surface 24 is smaller than the inner diameter D1 of the inner peripheral surface 20.

The first support surface 26 is formed on the convex portion 22. The first support surface 26 is an upward surface. The first support surface 26 is a surface that abuts on the segment 4. The first support surface 26 is a surface that positions the segment 4 in the vertical direction with respect to the segment jig 12. In other words, the first support surface 26 is a surface that positions the segment 4 in the axial direction of the mold 10.

The second support surface 28 is an inner peripheral surface that faces inward in the radial direction. The second support surface 28 is located above the first support surface 26. The second support surface 28 is a surface with which the segment 4 abuts. The second support surface 28 is a surface that positions the segment 4 in the radial direction with respect to the segment jig 12.

The side plate jig 14 has a ring shape. The side plate jig 14 is located below the segment jig 12. The side plate jig 14 includes a contact surface 30, a tapered surface 32, a third support surface 34, and a fourth support surface 38. The side plate jig further includes a convex portion 36.

The contact surface 30 is an upward surface. The contact surface 30 is a surface on which the bottom surface 16 of the segment jig 12 comes into contact. When the contact surface 30 and the bottom surface 16 come into contact with each other, the segment jig 12 is positioned in the vertical direction with respect to the side plate jig 14.

The tapered surface 32 is located inside the contact surface 30 in the radial direction. The tapered surface 32 extends upward from the contact surface. The tapered surface 32 is a surface that extends from the lower side to the upper side so as to be inclined inward from the outer side in the radial direction. The tapered surface 32 is formed at a position facing the tapered surface 18 of the segment jig 12. When the segment jig 12 is attached to the side plate jig 14, the tapered surface 32 guides the tapered surface 18, so that the segment jig 12 is guided to a predetermined position in the radial direction. When the tapered surface 32 and the tapered surface 18 come into contact with each other, the center position of the segment jig 12 is aligned with the center position of the side plate jig 14 in the radial direction.

The third support surface 34 is located inside the tapered surface 32 in the radial direction. The third support surface 34 is located above the tapered surface 32. The third support surface 34 is an upward surface. The third support surface 34 is a surface that the side plate 6 comes into contact with. The third support surface 34 is a surface that positions the side plate 6 in the vertical direction with respect to the side plate jig 14.

The convex portion 36 is located inside the third support surface 34 in the radial direction. The convex portion 36 projects upward from the third support surface 34. The convex portion 36 extends around in the circumferential direction.

The fourth support surface 38 is formed on the convex portion 36. The fourth support surface 38 is an outer peripheral surface facing outward in the radial direction. The fourth support surface 38 is a surface that comes into contact with the side plate 6. The fourth support surface 38 is a surface that positions the side plate 6 in the radial direction with respect to the side plate jig 14.

As shown in FIG. 1, each segment 4 is in contact with another segment 4 adjacent to each other in the circumferential direction. The plurality of segments 4 are arranged in the circumferential direction to form a ring. In this mold 10, nine segments 4 are arranged in the circumferential direction to form a ring. The number of the segments 4 is usually 3 or more and 24 or less. This segment 4 mainly forms the tread surface of the tire. The side plate 6 has a ring shape. The side plate 6 mainly forms the outer surface of the sidewall of the tire. A bead ring 8 is attached to the inside of the side plate 6 in the radial direction. The bead ring 8 has a ring shape. The bead ring 8 forms an axial outer surface and a radial inward bottom surface of the bead.

As shown in FIG. 3, the segment 4 includes a tread cavity surface 40, a pair of inner peripheral contact surfaces 42, a pair of inner peripheral surfaces 44, a pair of end surfaces 46, and an outer peripheral surface 48. The tread cavity surface 40 is a surface facing inward in the radial direction. The tread cavity surface 40 is located at the center of the segment 4 in the axial direction (vertical direction of the cleaning jig 2). The tread cavity surface 40 is a surface for forming the tread surface.

Each inner peripheral contact surface 42 is located on the outer side in the axial direction of the tread cavity surface 40. The inner peripheral contact surface 42 is a surface facing inward in the radial direction. Each inner peripheral surface 44 is located on the outer side in the axial direction of the inner peripheral contact surface 42. The inner peripheral surface 44 is a surface facing inward in the radial direction. The inner peripheral surface 44 is located radially outside the inner peripheral contact surface 42.

Each end surface 46 is located on the outer side in the axial direction of the inner peripheral surface 44. The end surface 46 is an axially outward surface. The end surface 46 is in contact with the first support surface 26. The end surface 46 and the first support surface 26 are in contact with each other, and the segment 4 is positioned in the vertical direction with respect to the segment jig 12. The outer peripheral surface 48 is a surface facing outward in the radial direction. The outer peripheral surface 48 is located between the pair of end surfaces 46 in the axial direction. The outer peripheral surface 48 is in contact with the second support surface 28. The outer peripheral surface 48 and the second support surface 28 are in contact with each other, and the segment 4 is positioned in the radial direction with respect to the segment jig 12.

The side plate 6 includes a side cavity surface 50, an outer peripheral contact surface 52, an outer peripheral surface 54, an end surface 56, a positioning surface 58, an inner peripheral contact surface 60, and a contact surface 62. The side plate 6 is further provided with a screw hole 64. The side cavity surface 50 is an axially inward surface. The side cavity surface 50 mainly forms the outer surface of the sidewall.

An outer peripheral contact surface 52 and an outer peripheral surface 54 are formed on the outer side in the radial direction of the side cavity surface 50. The outer peripheral contact surface 52 and the outer peripheral surface 54 are surfaces facing outward in the radial direction. When the mold 10 is closed, the outer peripheral contact surface 52 comes into contact with the inner peripheral contact surface 42 of the segment 4. At this time, the outer peripheral surface 54 and the inner peripheral surface 44 of the segment 4 face each other with a gap between them. A screw hole 64 that opens outward in the radial direction is formed on the outer peripheral surface 54. The screw holes 64 are formed at a plurality of locations, for example, two locations or three or more locations, at intervals in the circumferential direction. A hanging bolt can be screwed into the screw hole 64.

The end surface 56 is an axially outward surface. The end surface 56 is in contact with the third support surface 34 of the side plate jig 14. The end surface 56 and the third support surface 34 are in contact with each other, and the side plate 6 is positioned in the axial direction (vertical direction of the cleaning jig 2).

The positioning surface 58 is formed inside the end surface 56 in the radial direction. The positioning surface 58 is an inner peripheral surface facing inward in the radial direction. The positioning surface 58 is in contact with the fourth support surface 38 of the side plate jig 14. The positioning surface 58 and the fourth support surface 38 are in contact with each other, and the side plate 6 is positioned in the radial direction.

The inner peripheral contact surface 60 is located inside the side cavity surface 50 in the radial direction. The inner peripheral contact surface 60 is an inner peripheral surface facing inward in the radial direction. The contact surface 62 is an axially inward surface. The bead ring 8 is in contact with the inner peripheral contact surface 60 and the contact surface 62.

The bead ring 8 includes a bead cavity surface 66, an outer peripheral contact surface 68, and a contact surface 70. The bead cavity surface 66 forms an axial outer surface of the bead of the tire and a bottom surface of the bead. The outer peripheral contact surface 68 is in contact with the inner peripheral contact surface 60 of the side plate 6. The bead ring 8 is positioned in the radial direction with respect to the side plate 6 by the contact between the outer peripheral contact surface 68 and the inner peripheral contact surface 60. The contact surface 70 is in contact with the contact surface 62 of the side plate 6. The bead ring 8 is positioned in the axial direction (vertical direction of the cleaning jig 2) by the contact between the contact surface 70 and the contact surface 62.

Reference numeral G in FIG. 3 represents the center of gravity of segment 4. Reference numeral P1 represents the lower end of the tread cavity surface 40 in the vertical direction. Reference numeral P2 represents the lower end of the inner peripheral contact surface 42 in the vertical direction. Reference numeral P3 represents the lower end of the inner peripheral surface 44 in the vertical direction. Reference numeral P4 represents the radial outer end of the side cavity surface 50 of the side plate 6. Reference numeral P5 represents the lower end of the inner peripheral surface 24 of the segment jig 12 in the vertical direction.

With the mold 10 closed, the inner peripheral contact surface 42 and the outer peripheral contact surface 52 come into contact with each other. In this mold 10, the position of the lower end P1 of the tread cavity surface 40 and the position of the lower end P2 of the inner peripheral contact surface 42 are the same as the position of the outer end P4 of the side cavity surface 50 in the radial direction. The mold 10 is an example, and in the radial direction, the lower end P1 and the lower end P2 may be located outside the outer end P4 or inside the outer end P4. In the radial direction, the lower end P3 of the inner peripheral surface 44 is located outside the lower end P2 of the inner peripheral contact surface 42. In this segment jig 12, the lower end P5 of the inner peripheral surface 24 is located outside the outer end P4 of the side cavity surface 50.

The double-headed arrow Hs in FIG. 3 represents the height from the third support surface 34 to the lower end P4. The double-headed arrow H1 represents the height from the third support surface 34 to the lower end P5. The convex portion 22 of the segment jig 12 is formed above the height H1 from the third support surface 34. This height H1 is larger than the height Hs.

FIG. 4 shows a vulcanizer 72 using the mold 10. The vulcanizer 72 includes a mold 10, a bladder 74, an upper plate 76, a lower plate 78, a large number of sectors 80, an actuator 82, and an upper platen plate 84. In the vulcanizer 72, the mold 10 is made capable of changing its posture between a closed closed posture and an open open posture.

FIG. 4 shows the mold 10 in a closed posture. In the closed posture, a large number of segments 4 are in contact with each other in the circumferential direction to form a ring. The inner peripheral contact surface 42 of these segments 4 and the outer peripheral contact surface 52 of the side plate 6 are in contact with each other. The inner peripheral contact surface 60 and the contact surface 62 of the side plate 6 are in contact with the outer peripheral contact surface 68 and the contact surface 70 of the bead ring 8. The mold 10 and the bladder 74 form a cavity 86. A low cover 88 that is vulcanized to form a tire is housed in the cavity 86.

Although not shown, in the mold 10 in the open posture of the vulcanizer 72, the side plate 6 and the bead ring 8 located below and the side plate 6 and the bead ring 8 located above are separated in the vertical direction. Segment 4 is moving outward in the radial direction. The segments 4 are located spaced apart from each other in the circumferential direction. The positional relationship between the segment 4, the side plate 6 and the bead ring 8 is an example, and is not limited thereto. This positional relationship may be such that the low cover 88 can be put in and the tire formed from the low cover 88 can be taken out.

In the vulcanizer 72, when the closed mold 10 of FIG. 4 is opened, the segment 4 moves outward in the radial direction together with the sector 80. At this time, the sector 80 slides on the upper surface 78a of the lower plate 78. A gap S is formed between the lower end surface 46 of the segment 4 and the upper surface 78a of the lower plate 78. The gap S prevents the segment 4 from interfering with the lower plate 78. In order to form this gap S, the end surface 46 of the segment 4 is located above the end surface 56 of the side plate 6.

The method for manufacturing a tire using the vulcanization apparatus 72 includes a preforming step and a vulcanization step. In the preforming step, the low cover 88 is formed by combining the members forming each part of the tire. In the vulcanization step, the mold 10 is in the open position. The low cover 88 is put into the mold 10. The mold 10 is placed in the closed position. The low cover 88 is pressurized and heated in the mold 10 to form a tire from the low cover 88. The mold 10 is in the open position. The tire is taken out from the mold 10.

In this tire manufacturing method, the mold 10 is repeatedly used. By this repeated use, the mold 10 becomes dirty. The mold 10 is regularly cleaned. This cleaning removes the dirt that has adhered.

Here, a method of cleaning the mold 10 using the cleaning jig 2 will be described. This cleaning method includes a segment mounting step, a side plate mounting step, a jig assembly step, a laser irradiation step, a jig disassembling step, a side plate removing step, and a segment removing step.

In the segment mounting step, the segment 4 is mounted on the segment jig 12. In this segment jig 12, a plurality of segments 4 are in contact with each other in the circumferential direction to form a ring. The segment 4 may be placed on the segment jig 12, or may be further fixed by screwing or the like.

In the side plate mounting step, a hanging bolt is attached to the screw hole 64 of the side plate 6. The side plate 6 is hung and transported by this hanging bolt. A bead ring 8 is attached to the side plate 6 to be transported. The side plate 6 is placed on the side plate jig 14. The side plate 6 may be placed on the side plate jig 14, or may be further fixed by screwing or the like.

In the jig assembly process, the segment jig 12 is lowered from above the side plate jig 14. The tapered surface 18 of the segment jig 12 is guided to the tapered surface 32 of the side plate jig 14. The bottom surface 16 of the segment jig 12 comes into contact with the contact surface 30 of the side plate jig 14. The segment jig 12 is placed on the side plate jig 14. The segment jig 12 and the side plate jig 14 are integrally assembled.

In the laser irradiation step, the laser is applied to the tread cavity surface 40 of the segment 4, the pair of inner peripheral contact surfaces 42, the side cavity surface 50 of the side plate 6, and the bead cavity surface 66 of the bead ring 8. In laser cleaning, it is necessary to adjust the laser irradiation position so that the laser can be irradiated to the position to be cleaned. In this cleaning jig 2, the tread cavity surface 40, the pair of inner peripheral contact surfaces 42, the side cavity surface 50, and the bead cavity surface 66 are positioned with high accuracy, so that cleaning with a laser can be easily performed.

In the jig disassembly step, the segment jig 12 is removed from the side plate jig 14.
In the side plate removing step, the side plate 6 is hung by the hanging bolt and removed from the side plate jig 14. In the laser irradiation step described above, the laser is irradiated with the hanging bolts attached to the side plate 6. Although not shown, the segment jig 12 may have recesses or notches so as not to interfere with the hanging bolts. Further, the hanging bolt may be removed from the side plate 6 before the jig assembly process. When removed, hanging bolts may be attached to the side plate 6 in this side plate removing step. In the segment removing step, the segment 4 is removed from the segment jig 12.

This cleaning method further comprises a partial laser irradiation step after the side plate mounting step and before the jig assembly step. In the side plate mounting step, the side plate 6 is mounted on the side plate jig 14. In this partial laser irradiation step, the laser is irradiated to the outer peripheral contact surface 52 of the side plate 6 positioned on the side plate jig 14. The outer peripheral surface 52 is cleaned with a laser. This partial laser irradiation step may be performed after the jig disassembling step and before the side plate removing step. Further, the outer peripheral contact surface 52 may be cleaned separately from this cleaning method.

In the cleaning using the cleaning jig 2, the segment 4 is positioned by the segment jig 12. The side plate 6 is positioned by the side plate jig 14. As a result, both the segment 4 and the side plate 6 can be easily cleaned with a laser.

The alternate long and short dash line B in FIG. 3 illustrates the laser irradiation direction. In this cleaning jig 2, the lower end P1 of the tread cavity surface 40 of the segment 4 is located above the outer end P4 of the side cavity surface 50 of the side plate 6. The peripheral portion of the lower end P1 of the tread cavity surface 40 is not hidden behind the side cavity surface 50. The entire tread cavity surface 40 can be easily cleaned with a laser.

In this cleaning jig 2, the lower end P2 of the inner peripheral contact surface 42 of the segment 4 is located above the outer end P4 of the side cavity surface 50 of the side plate 6. The inner peripheral contact surface 42 is arranged above the side cavity surface 50. The inner peripheral contact surface 42 is not hidden behind the side cavity surface 50. In this cleaning jig 2, the inner peripheral contact surface 42 of the segment 4 can be easily cleaned by a laser together with the tread cavity surface 40 and the side cavity surface 50. As a result, it is not necessary to manually clean the inner peripheral contact surface 42 of the segment 4. Further, since it is not necessary to manually remove the dirt, it is possible to prevent the inner peripheral contact surface 42 from being accidentally scratched by hand. As a result, the generation of overspew (OV / SP) formed between the inner peripheral contact surface 42 and the outer peripheral contact surface 52 can be suppressed.

In the cleaning jig 2, the segment jig 12 is detachably attached to the side plate jig 14. The segment jig 12 may be placed on the side plate jig 14 or may be fixed by screwing or the like. By removing the segment jig 12, the side plate 6 can be easily attached / detached and transported by the hanging bolts attached to the screw holes 64 of the side plate 6.

In this side plate 6, since the hanging bolt is attached to the screw hole 64, it is not necessary to attach the hanging bolt or the like inside the side plate 6 in the radial direction. The side plate 6 can be attached to and detached from the side plate jig 14 and transported with the bead ring 8 attached. In this cleaning jig 2, the side plate 6 is held by the side plate jig 14 in a state where the bead ring 8 is attached to the side plate 6. In this cleaning jig 2, the bead cavity surface 66 of the bead ring 8 is positioned. The bead cavity surface 66 can be easily cleaned with a laser together with the side cavity surface 50 of the side plate 6.

In the cleaning jig 2, the first support surface 26 is formed on the convex portion 22 protruding inward in the radial direction. The radial inner end of the first support surface 26 is located inside the center of gravity G of the segment 4 in the radial direction. As a result, the segment jig 12 can stably hold the segment 4.

In the segment jig 12 of the cleaning jig 2, the inner diameter D2 of the inner peripheral surface 24 is made larger than the outer diameter Ds of the side plate 6, but the present invention is not limited to this. When the laser is irradiated, the side cavity surface 50 may be in a positional relationship that is not hidden behind the convex portion 22. With this positional relationship, the inner diameter D2 and the outer diameter Ds may be the same size, or the inner diameter D2 may be smaller than the outer diameter Ds. By reducing the inner diameter D2, the segment jig 12 can hold the segment 4 more stably. Further, in the cleaning jig 2, the segment jig 12 is removed from the side plate jig 14, so that the side plate 6 can be attached and detached even if the inner diameter D2 is the outer diameter Ds or less.

Since the height H1 of the lower end P5 of the inner peripheral surface 24 of the segment jig 12 is larger than the height Hs of the outer end P4 of the side plate 6, the convex portion 22 does not interfere with the side cavity surface 50. The convex portion 22 is easily extended inward in the radial direction from the center of gravity G.

When the segment jig 12 is attached to the side plate jig 14, the tapered surface 18 is guided by the tapered surface 32 and attached. The radial position of the segment jig 12 and the radial position of the side plate jig 14 can be easily and accurately aligned. The segment jig 12 and the side plate jig 14 can be easily attached to and detached from each other.

Hereinafter, the effects of the present invention will be clarified by Examples, but the present invention should not be construed in a limited manner based on the description of these Examples.

[Example]
The cleaning jigs shown in FIGS. 1 to 3 were prepared. A mold was prepared after manufacturing a predetermined number of tires. The cleaning jig held a segment of the mold, one side plate, and one bead ring. This segment, one side plate and one bead ring were laser cleaned. At this time, the manual work time of the worker was measured.

[Comparison example]
The cleaning jig J shown in FIG. 5 was prepared. A segment of this mold and one side plate were placed on the cleaning jig J. The alternate long and short dash line B in FIG. 5 illustrates the laser irradiation direction. In this cleaning jig J, a shaded area A (two-dot chain line in FIG. 5) where laser irradiation is difficult was formed. Further, the side plate was placed on the cleaning jig J by using the screw holes for fixing the bead ring formed on the side plate. The bead ring was removed from the side plate for this placement. Other than that, this segment and one side plate were laser cleaned in the same manner as in Example 1. At this time, the manual work time of the worker was measured.

[Evaluation of working hours]
Table 1 shows the difference between the manual work time of the example and the manual work time of the comparative example. “Inner peripheral contact surface cleaning time (minutes)” in Table 1 represents the cleaning time of the inner peripheral contact surface of the segment. In the embodiment, the inner peripheral contact surface was cleaned with a laser, so that no manual work time was incurred. The “recleaning time (minutes)” in Table 1 represents the manual work time required for recleaning the cavity surface cleaned by the laser. In the examples, the cavity surface did not need to be recleaned. On the other hand, in the comparative example, the tread cavity surface of the shaded area A was recleaned. “Bead ring removal (minutes)” in Table 1 represents the manual work time required to remove the bead ring from the side plate in the comparative example.

[Evaluation of productivity]
A mold cleaned in the examples and a mold cleaned in the comparative example were prepared. Tires were produced in each mold. Table 2 shows the number of tires produced until overspew (OV / SP) is confirmed on the tires. Compared to the mold of the comparative example, the mold of the example produces a large number of pieces until overspew (OV / SP) occurs. The frequency of cleaning the molds of the examples can be less than the frequency of cleaning the molds of the comparative examples. The mold of the example contributes to the improvement of productivity.

As shown in Tables 1 and 2, the cleaning jigs of the examples have a higher evaluation than the cleaning jigs of the comparative examples. From this evaluation result, the superiority of the present invention is clear.

The cleaning jig described above can be widely applied to a method of laser cleaning a mold used in a tire vulcanization process.

2 ... Cleaning jig 4 ... Segment 6 ... Side plate 8 ... Bead ring 10 ... Mold 12 ... Segment jig 14 ... Side plate jig 24 ... Inner circumference Surface 40: Tread cavity surface 42: Inner peripheral contact surface 50: Side cavity surface 52: Outer peripheral contact surface 66: Bead cavity surface

Claims (6)

A jig that holds a mold that has a number of segments that form the tread of a tire and side plates that form the sidewalls of the tire when it is laser cleaned.
The side plate jig that holds the side plate and
A large number of the above segments are brought into contact with each other in the circumferential direction and held in a ring shape, and the lower end of the cavity surface of each segment is positioned above the radial outer end of the cavity surface of the side plate. A cleaning jig equipped with a segment jig to be used. The cleaning jig according to claim 1, wherein the segment jig is detachably attached to the side plate jig. The above segment jig
The cleaning treatment according to claim 1 or 2, wherein the inner peripheral contact surface of the segment that contacts the side plate is positioned above the radial outer end of the cavity surface of the side plate to hold the segment. Ingredients. A method of cleaning a mold, in which a mold having a large number of segments for forming a tire tread and a side plate for forming a tire sidewall is laser-cleaned.
It is equipped with a side plate mounting process, a segment mounting process, a jig assembly process, and a laser irradiation process.
In the side plate mounting step, the side plate is held by the side plate jig.
In the segment mounting step, a large number of the segments are held in a segment jig in a state of being arranged in a ring shape in contact with each other in the circumferential direction.
In the jig assembly step, the segment jig is placed on the side plate jig by positioning the lower end of the cavity surface of each segment in the vertical direction above the radial outer end of the cavity surface of the side plate. , The above segment jig and side plate jig are assembled integrally,
In the laser irradiation step, the laser is irradiated to the cavity surface of the segment and the cavity surface of the side plate in a state where the segment jig and the side plate jig are integrally assembled.
How to clean the mold. In the side plate mounting step, a hanging bolt is attached to a screw hole formed on the radial outer peripheral surface of the side plate, and the side plate is hung by the hanging bolt and mounted on the side plate jig. The mold cleaning method according to claim 4. The above mold has a bead ring that molds the bead.
The method for cleaning a mold according to claim 5, wherein in the side plate mounting step, the bead ring is attached to the inside in the radial direction of the side plate mounted on the side plate jig.

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