CN109572017B - Buckling ring turn-up device and method for aviation radial tire forming machine - Google Patents
Buckling ring turn-up device and method for aviation radial tire forming machine Download PDFInfo
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- CN109572017B CN109572017B CN201910009669.XA CN201910009669A CN109572017B CN 109572017 B CN109572017 B CN 109572017B CN 201910009669 A CN201910009669 A CN 201910009669A CN 109572017 B CN109572017 B CN 109572017B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/36—Expansion of tyres in a flat form, i.e. expansion to a toroidal shape independently of their building-up process, e.g. of tyres built by the flat-tyres method or by jointly covering two bead-rings
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Abstract
The invention relates to a buckling ring turn-up device and a buckling ring turn-up method for an aviation radial tire forming machine. The device comprises a tire body drum, a right angle folding unit, a left turn-up unit and a right turn-up unit, wherein the tire body drum is arranged on a main shaft and can rotate along with the main shaft; the right angle folding unit is used for hooping and pressing the tire body cord fabric into a right angle structure when the tire body drum is expanded; the left turn-up unit is arranged on the left side of the tire body drum and comprises a left turn-up capsule and a left turn-up component, the left turn-up capsule is arranged on a main shaft between the left side of the tire body drum and the left turn-up component, and the left turn-up component is axially movably arranged on the main shaft on the left side of the tire body drum and is used for turning up a tire bead in a tire body cord fabric when the left turn-up capsule is inflated and expanded; the right turn-up unit and the left turn-up unit are symmetrically arranged on the right side of the tire body drum, and the right turn-up assembly is axially movably arranged on a main shaft on the right side of the tire body drum and is used for turning up the tire bead in the tire body cord fabric when the right turn-up bladder is inflated and expanded.
Description
Technical Field
The invention relates to the technical field of aviation manufacturing, in particular to a buckling ring turn-up device and a buckling ring turn-up method for an aviation radial tire forming machine.
Background
The existing tire body cylinder molding mode of the aviation oblique crossing tire is that tire body cord fabric is expanded to a diameter larger than a tire bead and attached to the tire bead on a tire body drum, tire bead materials on two sides of the tire body drum are contracted to a diameter smaller than the tire bead by a forward wrapping device, the tire bead is arranged on a buckling ring disc, and a reverse wrapping capsule is inflated to complete a reverse wrapping process.
Because the angle of the cord fabric of the aviation radial tire cord relative to the aviation bias tire cord is small (the included angle between the cord fabric and the axial direction of a tire drum is 3-5 degrees), the number of the attaching layers is large (the cord fabric of the 6-8 inner lining layers is generally attached by one-time attaching), and the cord strength is large (a high-strength nylon cord is adopted). If an aviation bias tire carcass tube forming process is adopted, the carcass cord fabric is attached when the attachment drum expands to a large diameter, then the finger-shaped sheets are adopted to positively wrap and contract the carcass cord fabric materials on two sides of the carcass drum, and after contraction, serious uneven rubber wrinkles are generated at the root part of the tire bead of the carcass tube, so that the requirement of the aviation radial tire carcass tube forming process cannot be met, and the existing aviation radial tire can only adopt a manual positive wrapping mode to shrink the carcass tube.
Accordingly, the inventors provide a buckle turn-up device and method for an aviation radial tire building machine.
Disclosure of Invention
The embodiment of the invention provides a buckling ring turn-up device and a buckling ring turn-up method for an aviation radial tire forming machine, which solve the problem of rubber pleating at the root part of a tire bead of a tire body cylinder of an aviation radial tire and realize automatic forming of the tire body cylinder.
The invention provides a buckling ring turn-up device for an aviation radial tire forming machine, which comprises:
the tire body drum is arranged on the main shaft and can rotate along with the main shaft, and the tire body drum is used for attaching the tire body cord fabric to the radial expansion end of the tire body drum;
the right angle folding unit comprises a left ring body and a right ring body, wherein the left ring body and the right ring body are respectively provided with a side pressure block which is circumferentially distributed and can radially stretch out and draw back, and the side pressure blocks are used for hooping and pressing the tire body cord fabric into a right angle structure when the tire body drum expands;
the left turn-up unit is arranged on the left side of the carcass drum and comprises a left turn-up bladder and a left turn-up assembly, the left turn-up bladder is arranged on a main shaft between the left side of the carcass drum and the left turn-up assembly, and the left turn-up assembly is axially movably arranged on the main shaft on the left side of the carcass drum and is used for turning up a tire bead in a carcass cord fabric when the left turn-up bladder is inflated and expanded;
the right turn-up unit is symmetrically arranged on the right side of the tire body drum with the left turn-up unit and comprises a right turn-up capsule and a right turn-up component, the right turn-up capsule is arranged on the right side of the tire body drum and on a main shaft between the right turn-up components, and the right turn-up component is axially movably arranged on the main shaft on the right side of the tire body drum and used for turning up a tire bead in a tire body cord fabric when the right turn-up capsule is inflated and expanded.
Further, the left turn-up assembly comprises a left buckling ring disc, a left boosting disc and a left sliding frame, the left sliding frame is slidably mounted on a main shaft on the left side of the tire body drum and located on the outer side of the left turn-up bladder, the left buckling ring disc and the left boosting disc are mounted on the left sliding frame, the left buckling ring disc is used for placing a tire bead and loading the tire bead into a right-angle structure of a tire body cord fabric, and the left boosting disc is used for pushing the tire body cord fabric to the upper surface of the tire body drum after the left turn-up bladder is inflated and expanded so that the tire bead is turned up in the tire body cord fabric.
Further, the right ring body assembly comprises a right buckling ring disc, a right boosting disc and a right sliding frame, the right sliding frame is slidably mounted on a spindle on the right side of the tire body drum and located on the outer side of the right turn-up bladder, the right buckling ring disc and the right boosting disc are mounted on the right sliding frame, the right buckling ring disc is used for placing a tire bead and installing the tire bead in a right-angle structure of a tire body cord fabric, and the right boosting disc is used for pushing the tire body cord fabric to the upper surface of the tire body drum after the right turn-up bladder is inflated and expanded so that the tire bead is turned up in the tire body cord fabric.
Further, the right angle folding unit further comprises a driving mechanism of an air cylinder or a motor, and the driving mechanism drives the side pressure blocks to radially extend and retract.
Furthermore, the main shaft comprises a left main shaft and a right main shaft, and the left main shaft and the right main shaft are connected through a fluted disc and synchronously rotate.
Further, the carcass drum and the right turn-up bladder are mounted on the right spindle, and the left turn-up bladder is mounted on the left spindle.
In a second aspect, the invention provides a buckling ring turn-up method for an aviation radial tire building machine, which adopts the buckling ring turn-up device of the first aspect, and comprises the following steps:
expanding a tire body drum to a fitting diameter D1, and fitting a tire body cord fabric;
moving the right angle receiving unit from the resident station to the fitting station to position the left and right side pressure blocks at two sides of the tire body drum;
step three, the side pressure blocks of the right angle folding unit are radially folded to reach the upper part of the carcass cord fabric outside the carcass drum;
expanding the tire body drum to a buckling ring diameter D2, wherein D2 is larger than D1, and hooping and pressing the root part of the tire ring of the tire body drum by a side pressing block to form a right-angle structure on the tire body cord fabric at the radial expansion end of the tire body drum, so that the tire body cord fabrics at two side edges form a slope after the tire body drum is expanded, and positioning preparation is made for accurately mounting the tire ring;
step five, returning the side pressure block of the right angle receiving unit, and returning the right angle receiving unit from the attaching position to the resident position;
step six, the left turn-up component and the right turn-up component move towards the tire body drum simultaneously, and the left tire bead and the right tire bead are respectively attached to right-angle structures of tire body cord fabrics on two side surfaces of the tire body drum;
step seven, returning the left turn-up assembly and the right turn-up assembly to the resident position, and inflating and expanding the left turn-up capsule and the right turn-up capsule;
step eight, simultaneously moving the left turn-up component and the right turn-up component to the tire body drum, respectively extruding the left turn-up bladder and the right turn-up bladder, turning up tire body cord fabric materials on two sides to the upper surface of the tire body drum, and turning up tire beads in the tire body cord fabric;
and step nine, exhausting the left turn-up capsule and the right turn-up capsule, returning the left turn-up assembly and the right turn-up assembly to the resident positions, and finishing the turn-up process.
In conclusion, the invention solves the problem of rubber wrinkles at the root of the carcass drum of the aircraft radial tire, the carcass cord fabric is adopted to be attached to the small diameter of the carcass drum, the material of the carcass drum expands after the side pressure blocks hoop the materials at the two sides of the carcass drum, and the anti-package capsule is inflated to carry out anti-package, so that the rubber wrinkles at the root of the carcass drum can be eliminated. The method can meet the requirement of the forming process of the carcass barrel of the aviation radial tire, realizes the automatic forming of the carcass barrel, and effectively solves the process problem of manually shrinking the carcass barrel of the existing aviation radial tire.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a buckle turnup device for an aviation radial tire building machine according to an embodiment of the invention.
Fig. 2 to 9 are schematic views of a buckle turn-up method of a buckle turn-up device according to an embodiment of the present invention.
In the figure:
1-a carcass drum; 2-left main shaft; 3-right main shaft; 4-carcass ply; 5-a right angle folding unit; 6-side briquetting; 7-left turn-up capsule; 8-left buckle ring disc; 9-left boosting disc; 10-left carriage; 11-right turn-up capsule; 12-right buckle ring disc; 13-right boosting disc; 14-a right carriage; 15-a bead; 16-fluted disc.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 shows a buckle turnup device for an aviation radial tire building machine according to an embodiment of the invention. As shown in fig. 1 to 9, the apparatus comprises at least a carcass drum 1, a squaring unit 5, a left turn-up unit and a right turn-up unit. The tire body drum 1 is arranged on a main shaft (comprising a left main shaft 2 and a right main shaft 3) and can rotate along with the main shaft, and the tire body drum 1 is used for attaching a tire body cord fabric 4 to a radial expansion end of the tire body drum; the right angle folding unit 5 comprises a left ring body and a right ring body, wherein the left ring body and the right ring body are respectively provided with a side pressure block 6 which is circumferentially distributed and can radially stretch and contract and is used for hooping and pressing the tire body cord fabric 4 into a right angle structure when the tire body drum 1 expands; the left turn-up unit is arranged on the left side of the carcass drum 1 and comprises a left turn-up bladder 7 and a left turn-up assembly (comprising a left buckling ring disc 8, a left boosting disc 9 and a left sliding frame 10), the left turn-up bladder 7 is arranged on a spindle between the left side of the carcass drum 1 and the left turn-up assembly, and the left turn-up assembly is axially movably arranged on the spindle on the left side of the carcass drum 1 and is used for turning up a tire bead 15 in the carcass cord fabric 4 when the left turn-up bladder 7 is inflated and expanded; the right side is turned over and is wrapped the unit with the left side is turned over and is wrapped the unit and establish symmetrically the right side of matrix drum 1, and the right side is turned over and is wrapped the unit and include right turn over and wrap capsule 11 and right turn over and wrap the subassembly (including right buckle dish 12, right boosting dish 13 and right balladeur train 14), right turn over wrap capsule 11 and install matrix drum 1 right side with on the main shaft between the subassembly is turned over to the right side, but right turn over wrap the subassembly axial displacement install on the main shaft on matrix drum 1 right side for when turning over right side and wrap capsule 11 inflation, turn over the tire bead 15 in matrix curtain cloth 4.
The left turn-up assembly comprises a left buckling ring disc 8, a left boosting disc 9 and a left sliding frame 10, the left sliding frame 10 is slidably mounted on a spindle on the left side of the tire body drum 1 and located on the outer side of the left turn-up bladder 7, the left buckling ring disc 8 and the left boosting disc 9 are mounted on the left sliding frame 10, the left buckling ring disc 8 is used for placing a tire bead 15 and installing the tire bead 15 in a right-angle structure of a tire body cord fabric 4, and the left boosting disc 9 is used for pushing the tire body cord fabric 4 on the left side to the upper surface of the tire body drum 1 after the left turn-up bladder 7 is inflated and expanded, so that the tire bead 15 is turned up in the tire body cord fabric 4.
The right ring body assembly comprises a right buckling ring disc 12, a right boosting disc 13 and a right sliding frame 14, the right sliding frame 14 is slidably mounted on a spindle on the right side of the tire body drum 1 and located on the outer side of the right turn-up bladder 11, the right buckling ring disc 12 and the right boosting disc 13 are mounted on the right sliding frame 14, the right buckling ring disc 12 is used for placing a tire bead 15 and installing the tire bead 15 in a right-angle structure of a tire body cord fabric 4, and the right boosting disc 13 is used for pushing the tire body cord fabric 4 on the right side to the upper surface of the tire body drum 1 after the right turn-up bladder 11 is inflated and expanded so that the tire bead 15 is turned up in the tire body cord fabric 4.
It should be noted that the right angle folding unit 5 further includes a driving mechanism of an air cylinder or a motor, and the side pressing block 6 is driven to radially extend and retract by the driving mechanism.
In addition, the main shaft includes left main shaft 2 and right main shaft 3, left side main shaft 2 with connect through fluted disc 16 between the right main shaft 3, realize that the diaxon is rotatory simultaneously to realize that left turn-up capsule 7, matrix drum 1, right turn-up capsule 11 are rotatory simultaneously, the cooperation pastes matrix curtain cloth.
As an alternative embodiment, the carcass drum 1 and the right turn-up bladders 11 are mounted on the right spindle and the left turn-up bladders 7 are mounted on the left spindle.
Another convenience, referring to fig. 1 to 9, the invention further provides a buckling ring turn-up method for an aviation radial tire building machine, and the working flow of the buckling ring turn-up method is as follows:
step one, the carcass drum 1 is expanded to the fitting diameter D1, fitting the carcass ply 4, as shown in fig. 1.
And step two, the right angle receiving unit 5 moves from the resident station to the attaching station, so that the left and right groups of side press blocks 6 are positioned at two sides of the carcass drum 1, as shown in fig. 2.
And step three, radially contracting the side pressure blocks 6 of the right angle folding unit 5 to reach the upper part of the carcass ply 4 outside the carcass drum 1, as shown in figure 3.
Step four, the carcass drum 1 is expanded to a buckling ring diameter D2, wherein D2> D1, the side pressure block 6 hoops and presses the root position of the tire bead of the carcass drum 1, so that the carcass ply 4 at the radial expansion end of the carcass drum 1 forms a right-angle structure, after the carcass drum is expanded, the carcass ply 4 at two sides form a slope, and positioning preparation is made for accurately mounting the tire bead 15, as shown in FIG. 4.
Step five, the side pressure block 6 of the right angle folding unit 5 returns, and the right angle folding unit 5 returns from the bonding position to the resident position, as shown in fig. 5.
Step six, the left sliding frame 10 of the left turn-up assembly and the right sliding frame 14 of the right turn-up assembly move towards the carcass drum 1 at the same time, and the left buckling ring disc 8 and the right buckling ring disc 12 respectively attach the left and right beads 15 to the right-angle structures of the carcass cords 4 on the two side surfaces of the carcass drum 1, as shown in fig. 6.
And step seven, returning the left turn-up assembly and the right turn-up assembly to the resident position, and inflating the left turn-up capsule 7 and the right turn-up capsule 11, as shown in fig. 7.
Step eight, the left turn-up assembly and the right turn-up assembly move towards the tire body drum 1 simultaneously, the left turn-up capsule 7 and the right turn-up capsule 11 are respectively extruded by the left boosting disc 9 and the right boosting disc 13, tire body curtain cloth materials on two sides are turned up to the upper surface of the tire body drum 1, and tire beads 15 are turned up in the tire body curtain cloth materials 4, as shown in the figure 8.
And step nine, exhausting air from the left turn-up capsule 7 and the right turn-up capsule 11, sliding the left turn-up assembly and the right turn-up assembly back to the resident position through the left sliding frame 10 and the right sliding frame 14, and finishing the buckling and turn-up process, which is shown in fig. 9.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For embodiments of the method, reference is made to the description of the apparatus embodiments in part. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The above description is only an example of the present application and is not limited to the present application. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (7)
1. A buckle turn-up device for an aviation radial tire building machine, comprising:
the tire body drum is arranged on the main shaft and can rotate along with the main shaft, and the tire body drum is used for attaching the tire body cord fabric to the radial expansion end of the tire body drum;
the right angle folding unit comprises a left ring body and a right ring body, wherein the left ring body and the right ring body are respectively provided with a side pressure block which is circumferentially distributed and can radially stretch out and draw back, and the side pressure blocks are used for hooping and pressing the tire body cord fabric into a right angle structure when the tire body drum expands;
the left turn-up unit is arranged on the left side of the carcass drum and comprises a left turn-up bladder and a left turn-up assembly, the left turn-up bladder is arranged on a main shaft between the left side of the carcass drum and the left turn-up assembly, and the left turn-up assembly is axially movably arranged on the main shaft on the left side of the carcass drum and is used for turning up a tire bead in a carcass cord fabric when the left turn-up bladder is inflated and expanded;
the right turn-up unit is symmetrically arranged on the right side of the tire body drum with the left turn-up unit and comprises a right turn-up capsule and a right turn-up component, the right turn-up capsule is arranged on the right side of the tire body drum and on a main shaft between the right turn-up components, and the right turn-up component is axially movably arranged on the main shaft on the right side of the tire body drum and used for turning up a tire bead in a tire body cord fabric when the right turn-up capsule is inflated and expanded.
2. The buckle turn-up apparatus according to claim 1, wherein the left turn-up assembly comprises a left buckle disc, a left booster disc and a left carriage, the left carriage is slidably mounted on the spindle on the left side of the carcass drum outside the left turn-up bladder, the left buckle disc and the left booster disc are mounted on the left carriage, the left buckle disc is used for placing and loading the tire bead into the right angle structure of the carcass ply, and the left booster disc is used for pushing the carcass ply against the upper surface of the carcass drum after the left turn-up bladder is inflated to turn up the tire bead into the carcass ply.
3. The buckle turn-up device of claim 1, wherein the right ring assembly comprises a right buckle disc, a right booster disc and a right carriage, the right carriage is slidably mounted on the spindle on the right side of the carcass drum outside the right turn-up bladder, the right buckle disc and the right booster disc are mounted on the right carriage, the right buckle disc is used for placing and loading a tire bead in a right-angled configuration of a carcass ply, and the right booster disc is used for pushing the carcass ply against the upper surface of the carcass drum after the right turn-up bladder is inflated, so that the tire bead is turned up in the carcass ply.
4. The buckle turn-up apparatus according to claim 1, wherein the right angle folding unit further comprises a driving mechanism of an air cylinder or a motor, and the driving mechanism drives the side pressure blocks to radially extend and retract.
5. The buckle turn-up device according to claim 1, wherein the main shaft comprises a left main shaft and a right main shaft, and the left main shaft and the right main shaft are connected through a fluted disc and rotate synchronously.
6. The buckle turn-up device of claim 5, wherein the carcass drum and the right turn-up bladder are mounted on the right spindle, and the left turn-up bladder is mounted on the left spindle.
7. A buckle turn-up method for an aviation radial tire building machine, characterized in that the buckle turn-up device of claim 1 is used, and the buckle turn-up method comprises:
expanding a tire body drum to a fitting diameter D1, and fitting a tire body cord fabric;
moving the right angle receiving unit from the resident station to the fitting station to position the left and right side pressure blocks at two sides of the tire body drum;
step three, the side pressure blocks of the right angle folding unit are radially folded to reach the upper part of the carcass cord fabric outside the carcass drum;
expanding the tire body drum to a buckling ring diameter D2, wherein D2 is larger than D1, and hooping and pressing the root part of the tire ring of the tire body drum by a side pressing block to form a right-angle structure on the tire body cord fabric at the radial expansion end of the tire body drum, so that the tire body cord fabrics at two side edges form a slope after the tire body drum is expanded, and positioning preparation is made for accurately mounting the tire ring;
step five, returning the side pressure block of the right angle receiving unit, and returning the right angle receiving unit from the attaching position to the resident position;
step six, the left turn-up component and the right turn-up component move towards the tire body drum simultaneously, and the left tire bead and the right tire bead are respectively attached to right-angle structures of tire body cord fabrics on two side surfaces of the tire body drum;
step seven, returning the left turn-up assembly and the right turn-up assembly to the resident position, and inflating and expanding the left turn-up capsule and the right turn-up capsule;
step eight, simultaneously moving the left turn-up component and the right turn-up component to the tire body drum, respectively extruding the left turn-up bladder and the right turn-up bladder, turning up tire body cord fabric materials on two sides to the upper surface of the tire body drum, and turning up tire beads in the tire body cord fabric;
and step nine, exhausting the left turn-up capsule and the right turn-up capsule, returning the left turn-up assembly and the right turn-up assembly to the resident positions, and finishing the turn-up process.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910009669.XA CN109572017B (en) | 2019-01-05 | 2019-01-05 | Buckling ring turn-up device and method for aviation radial tire forming machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910009669.XA CN109572017B (en) | 2019-01-05 | 2019-01-05 | Buckling ring turn-up device and method for aviation radial tire forming machine |
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| CN109572017A CN109572017A (en) | 2019-04-05 |
| CN109572017B true CN109572017B (en) | 2020-09-25 |
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| CN201910009669.XA Active CN109572017B (en) | 2019-01-05 | 2019-01-05 | Buckling ring turn-up device and method for aviation radial tire forming machine |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110920112B (en) * | 2019-12-05 | 2021-07-16 | 中国航空制造技术研究院 | Forming device and forming process for carcass barrel of aviation radial tire |
| CN113910653B (en) * | 2021-10-11 | 2023-04-07 | 中国航空制造技术研究院 | Automatic auxiliary fixtures that laminates of capsule type matrix |
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| CN203592694U (en) * | 2013-10-23 | 2014-05-14 | 北京敬业机械设备有限公司 | One-stage forming machine for radial ply tire production by using two-stage method |
| JP2019077079A (en) * | 2017-10-23 | 2019-05-23 | 住友ゴム工業株式会社 | Green tire manufacturing method |
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2019
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| WO2005097478A1 (en) * | 2004-04-05 | 2005-10-20 | Continental Aktiengesellschaft | Method for producing a pneumatic tire |
| CN1721173A (en) * | 2004-12-15 | 2006-01-18 | 贵州轮胎股份有限公司 | Full steel engineering radial-type tyre forming process |
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| DE102009025759A1 (en) * | 2009-05-07 | 2010-11-11 | Continental Reifen Deutschland Gmbh | Method for assembling radial tire for passenger car at tire building machine, involves laying tire carcass on building drum and expanding bellow carrier from inside at bead core |
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| JP2019077079A (en) * | 2017-10-23 | 2019-05-23 | 住友ゴム工業株式会社 | Green tire manufacturing method |
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