CN110774494B - Tire mold and processing method thereof, tire vulcanization method and tire - Google Patents
Tire mold and processing method thereof, tire vulcanization method and tire Download PDFInfo
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- CN110774494B CN110774494B CN201911024730.4A CN201911024730A CN110774494B CN 110774494 B CN110774494 B CN 110774494B CN 201911024730 A CN201911024730 A CN 201911024730A CN 110774494 B CN110774494 B CN 110774494B
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- mold
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
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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)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0606—Vulcanising moulds not integral with vulcanising presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2030/00—Pneumatic or solid tyres or parts thereof
Abstract
The invention discloses a tire mold and a processing method thereof, a vulcanization method of the tire and the tire, wherein the tire mold comprises a mold base body, a mold coating is fixedly arranged on a contact part of the mold base body and the tire, the thickness of the mold coating is 3.0-5.0 mu m, the surface roughness of the mold coating is Ra 4-Ra 6, the surface of the mold coating is provided with mold pores, the porosity is 10-20%, the surface morphology parameters of the mold coating of the tire mold are controlled, so that the surface blackness and the color uniformity of the tire produced by the tire mold are higher, the addition amount of chemical additives in the tire can be effectively reduced while the surface blackness and the color uniformity of the tire are ensured, and the performance of the tire is improved.
Description
Technical Field
The invention relates to the technical field of tires, in particular to a tire mold and a processing method thereof, a tire vulcanization method and a tire.
Background
In order to reduce the formation and growth of cracks of the tire in the presence of ozone, protective wax and an anti-aging agent must be added to the rubber composition; due to the solubility problem of the protective wax in the rubber, it gradually migrates to the rubber surface of the tire, sequestering ozone and protecting the rubber. The anti-aging agent can also migrate to the surface of the rubber at the same time, and the thickness is not uniform, so that the phenomenon of film interference is generated, which is expressed as uneven color of the surface of the tire,
the chemical anti-aging agent is a brown product, and the chemical anti-aging agent causes the yellowing of the tire after migrating to the surface of the tire; and the tire is parked for a long time, and the yellowing degree of the tire is further increased by products of the chemical anti-aging agent degraded by ozone.
When the prior art is used for solving the appearance problem of the tire, chemical additives are required to be additionally added into the rubber composition, which influences the performance of the finished tire.
Disclosure of Invention
In order to solve the technical problems, the invention provides the tire mold and the processing method thereof, the tire vulcanization method and the tire, wherein the surface morphology parameters of the mold coating are controlled, so that the surface blackness and the color uniformity of the produced tire are higher, the surface blackness and the color uniformity of the tire are ensured, the addition amount of chemical additives in the tire can be effectively reduced, and the performance of the tire is improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
a tire mold comprises a mold base body, wherein a mold coating is fixedly arranged on a contact part of the mold base body and a tire, the thickness of the mold coating is 3.0-5.0 mu m, the surface roughness of the mold coating is Ra 4-Ra 6, the surface of the mold coating is provided with mold pores, and the porosity is 10% -20%.
Further, the porosity of the mold coating surface was 15%.
Further, the material of the die coating is chromium or a chromium compound.
Further, the material of the die coating is nickel chromium-chromium carbide.
A processing method of a tire mold comprises the following steps:
the method comprises the following steps: carrying out surface sand blasting treatment on the mold matrix until the surface of the mold matrix has no metallic luster;
step two: cleaning the surface of the mold matrix by alcohol, drying and preheating, and spraying the coating material on the surface of the mold matrix to form the mold coating.
Specifically, the mold base was subjected to surface blasting using brown corundum.
Specifically, a plasma spray process is used when spraying the coating material onto the mold substrate.
A method for vulcanizing tyre includes putting tyre in mould, and controlling the external temp of vulcanization to 135-145 deg.C.
A tire vulcanized by the tire vulcanization method.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the surface blackness and color uniformity of the tire produced by the tire mold are higher by controlling the surface morphology parameters of the mold coating of the tire mold, the addition amount of chemical additives in the tire can be effectively reduced while the blackness and color uniformity of the tire surface are ensured, and the performance of the tire is improved.
Drawings
FIG. 1 is a schematic flow chart of a method of manufacturing a tire mold according to the present invention;
FIG. 2 is an image of the surface of a new tire of comparative example 3 of the present invention magnified 100 times under an SEM electron microscope;
FIG. 3 is an SEM electron microscope image of the surface of a new tire at 100 times magnification in example 2 of the present invention;
FIG. 4 is an image of the surface of a new tire of comparative example 3 of the present invention magnified 1000 times under an SEM electron microscope;
FIG. 5 is an image of the surface of a new tire of example 2 of the present invention magnified 1000 times under an SEM electron microscope;
FIG. 6 is a schematic representation of the structure of the extinction voids of a tire of the present invention;
FIG. 7 is an image of the surface of a 6-month parked tire of comparative example 3 of the present invention magnified 1000 times under an SEM electron microscope;
FIG. 8 is an image of the surface of a6 month parked tire of example 2 of the present invention magnified 1000 times under an SEM electron microscope;
FIG. 9 is a graph showing comparative analysis results of surface precipitates of tires parked for 6 months in comparative example 3 and example 2 according to the present invention.
Detailed Description
A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
A tire mold comprises a mold base body, wherein a mold coating is fixedly arranged on a contact part of the mold base body and a tire, the thickness of the mold coating is 3.0-5.0 mu m, the roughness of the surface of the mold coating is Ra 4-Ra 6, the surface of the mold coating is provided with mold pores, and the porosity is 10% -20%.
Preferably, the porosity of the mold coating surface is 15%.
The blackness of the tire surface is low, the color is yellow, the phenomenon is an optical phenomenon, if light is absorbed after irradiating the tire surface, the color and yellow phenomena are covered, and the blackness of the naked eye is high. Therefore, the micro-topography of the tire surface can be controlled by controlling the micro-topography of the surface of the vulcanization mold, so that a dull porous structure is formed, and the optical effect of the tire surface is changed.
In the present example, the mold coating surface roughness is Ra4, Ra5 or Ra6, and the porosity of the surface of the mold coating is 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19% or 20%, and the thickness of the mold coating is 3.0 μm, 3.1 μm, 3.2 μm, 3.3 μm, 3.4 μm, 3.5 μm, 3.6 μm, 3.7 μm, 3.8 μm, 3.9 μm, 4.0 μm, 4.1 μm, 4.2 μm, 4.3 μm, 4.4 μm, 4.5 μm, 4.6 μm, 4.7 μm, 4.8 μm, 4.9 μm or 5.0 μm, all of which can form mold pores on the surface of the mold coating and make the produced tire correspondingly effective matting pores occur, change the optical pores of the tire surface, make the tire surface matte effect high by adding a special matting aid, no yellowing after long-time storage.
The material of the die coating is chromium or a chromium compound; chromium and chromium compounds have extremely high hardness, and the chromium and chromium compounds have the advantages of long service life as a tire mold coating, capability of performing dry ice washing and sand washing according to normal washing frequency and the like, so that the chromium or chromium compounds are selected for the mold coating; the material of the die coating is preferably nickel chromium-chromium carbide.
A processing method of a tire mold comprises the following steps:
the method comprises the following steps: carrying out surface sand blasting treatment on the mold matrix until the surface of the mold matrix has no metallic luster;
step two: cleaning the surface of the mold matrix by alcohol, drying and preheating, and spraying the coating material on the surface of the mold matrix to form the mold coating.
Specifically, the mold base was subjected to surface blasting using brown corundum.
Specifically, a plasma spray process is used when spraying the coating material onto the mold substrate.
The plasma spraying is to convey the material into high-temperature plasma jet, the powder particles are instantly heated to a molten or semi-molten state by the high-temperature plasma jet, and the powder particles are respectively solidified on the surface of a substrate by taking single particles as units to form a layered sheet-shaped mold coating of metal or compound with special properties, and the coating can form a micro-pore structure.
The thickness, roughness and porosity of the coating surface can be controlled by existing conventional process parameters.
A method for vulcanizing tyre includes putting tyre in mould, and controlling the external temp of vulcanization to 135-145 deg.C.
The vulcanizing external temperature is the temperature of the mold matrix, and the vulcanizing external temperature is controlled within the range of 135-145 ℃, so that the speed of micromolecules migrating to the surface can be effectively controlled, and side reactions are reduced, thereby reducing micromolecule substances attached to the surface of the tire and improving the appearance of a new tire.
A tire vulcanized by the tire vulcanization method.
The technical effects of the present invention will be described in detail below with reference to comparative examples and examples.
Comparative example 1:
the thickness of the die coating was 2.5 μm, the surface roughness of the die coating was Ra3, the porosity of the die pores was 8%, and the external temperature of vulcanization was 130 ℃.
Comparative example 2:
the thickness of the mold coating was 5.5 μm, the surface roughness of the mold coating was Ra7, the porosity of the mold pores was 25%, and the vulcanization external temperature was 150 ℃.
Comparative example 3:
the mold coating was not used and the external temperature of the vulcanization was 140 ℃.
Example 1:
the thickness of the mold coating was 3.0 μm, the surface roughness of the mold coating was Ra4, the porosity of the mold pores was 10%, and the vulcanization external temperature was 135 ℃.
Example 2:
the thickness of the mold coating was 4.0 μm, the surface roughness of the mold coating was Ra5, the porosity of the mold pores was 15%, and the vulcanization external temperature was 140 ℃.
Example 3:
the thickness of the mold coating was 5.0 μm, the surface roughness of the mold coating was Ra6, the porosity of the mold pores was 20%, and the vulcanization external temperature was 145 ℃.
The blackness of a new tire was measured by a color strength meter, and the blackness of tires in other comparative examples and examples was measured with reference to comparative example 1, with the blackness index of the tire in comparative example 1 being 100, and the higher the index, the higher the blackness.
The tire color uniformity and the tire yellowing degree are subjectively evaluated by a subjective evaluation group, the subjective evaluation group is from 10 persons in different posts of different departments in the tire industry, the score is 10 points, the higher the score is, the higher the tire color uniformity is represented, and the lower the tire yellowing degree is represented.
| Comparative example 1 | Comparative example 2 | Comparative example 3 | Example 1 | Example 2 | Example 3 | |
| Thickness of mold coating (. mu.m) | 2.5 | 5.5 | - | 3.0 | 4.0 | 5.0 |
| Surface roughness of die coating | Ra3 | Ra7 | - | Ra4 | Ra5 | Ra6 |
| Porosity of the |
8% | 25% | - | 10% | 15% | 20% |
| External temperature of vulcanization (. degree.C.) | 130 | 150 | 140 | 135 | 140 | 145 |
| Blackness of new tire | 100 | 97 | 95 | 125 | 131 | 120 |
| Color uniformity of tire after half a year of parking | 4.7 | 4.5 | 4.5 | 9.2 | 9.5 | 8.9 |
| Degree of yellowing of tire after half a year of parking | 6.5 | 6.2 | 6.0 | 8.7 | 8.9 | 8.5 |
The tires of comparative example 1, comparative example, example 1, example 2 and example 3 were the same in rubber composition and did not contain any special chemical auxiliary for inhibiting yellowing of the tires.
According to the test results, when the thickness of the mold coating is 3.0-5.0 μm, the surface roughness of the mold coating is Ra 4-Ra 6, the porosity of the pores of the mold is 10-20%, and the vulcanization external temperature is 135-145 ℃, the blackness of the produced new tire is high, and after the new tire is parked for half a year, the color uniformity of the tire is high, and the yellowing degree of the tire is low.
After the tire was produced, SEM electron microscopy analysis was performed on the new tire surface.
FIG. 2 is a graph showing the surface topography of a new tire produced using the tire mold and the vulcanization external temperature of comparative example 3 at a time of 100 times, and FIG. 3 is a graph showing the surface topography of a new tire produced using the tire mold and the vulcanization external temperature of example 2 at a time of 100 times; as is evident from a comparison of fig. 2 and 3, the new tire produced with the tire mold and cure outside temperature of example 2 has a higher jetness.
FIG. 4 is a 1000-fold surface profile of a new tire produced using the tire mold and the vulcanization external temperature of comparative example 3, and FIG. 5 is a 1000-fold surface profile of a new tire produced using the tire mold and the vulcanization external temperature of example 2; as is evident from a comparison of fig. 4 and 5, the tire mold with the mold coating produced a tire surface having a dull pore structure; as shown in fig. 6, after entering the extinction aperture, the light forms multiple reflections, which produces a light absorption effect, which is manifested as high blackness of the tire surface, and can cover up the phenomena of color and yellowing.
After the tire was parked for 6 months, the surface of the tire was analyzed by SEM electron microscopy.
FIG. 7 is a 1000-fold surface profile of a new tire produced using the tire mold and the vulcanization external temperature of comparative example 3, and FIG. 8 is a 1000-fold surface profile of a new tire produced using the tire mold and the vulcanization external temperature of example 2; as can be seen from FIGS. 7 and 8, the anti-aging agents are precipitated on the surfaces of the tires produced by the two technical schemes; meanwhile, precipitates are analyzed, as shown in fig. 9, the components of the precipitates on the tire surfaces of the two schemes are consistent, and the total precipitated amount is similar, but because the surface of the new tire produced by the tire mold and the outer vulcanization temperature in the example 2 has extinction pores, light enters the pores to form multiple reflections, and a light absorption effect is formed, so that the phenomena of color development and yellowing are covered, and as is obvious from the comparison between fig. 8 and fig. 7, the blackness of the new tire produced by the tire mold and the outer vulcanization temperature in the example 2 is higher.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. A method for processing a tire mold, wherein the tire mold comprises a mold base body, and is characterized in that: a mold coating is fixedly arranged on a contact part of the mold substrate and the tire, the thickness of the mold coating is 3.0-5.0 μm, the surface roughness of the mold coating is Ra 4-Ra 6, the surface of the mold coating is provided with mold pores, and the porosity is 15%;
the material of the die coating is chromium or a chromium compound;
specifically, the material of the die coating is nickel chromium-chromium carbide;
the processing method comprises the following steps:
the method comprises the following steps: carrying out surface sand blasting treatment on the mold matrix until the surface of the mold matrix has no metallic luster;
step two: cleaning the surface of the mold matrix by using alcohol, drying and preheating, and spraying a coating material on the surface of the mold matrix to form a mold coating;
carrying out surface sand blasting treatment on the mold base body by using brown corundum;
plasma spray processes are used when spraying the coating material onto the mold substrate.
2. A tire mold, the tire mold comprising a mold base, characterized in that: a mold coating is fixedly arranged on a contact part of the mold substrate and the tire, the thickness of the mold coating is 3.0-5.0 μm, the surface roughness of the mold coating is Ra 4-Ra 6, the surface of the mold coating is provided with mold pores, and the porosity is 15%;
the material of the die coating is chromium or a chromium compound;
specifically, the material of the die coating is nickel chromium-chromium carbide;
the processing method of the tire mold comprises the following steps:
the method comprises the following steps: carrying out surface sand blasting treatment on the mold matrix until the surface of the mold matrix has no metallic luster;
step two: cleaning the surface of the mold matrix by using alcohol, drying and preheating, and spraying a coating material on the surface of the mold matrix to form a mold coating;
carrying out surface sand blasting treatment on the mold base body by using brown corundum;
plasma spray processes are used when spraying the coating material onto the mold substrate.
3. A method of vulcanizing a tire, characterized by: placing the tire into the tire mold of claim 2, and controlling the curing external temperature to be 135 ℃ to 145 ℃.
4. A tire, characterized by: the tire is vulcanized by the vulcanization method of claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911024730.4A CN110774494B (en) | 2019-10-25 | 2019-10-25 | Tire mold and processing method thereof, tire vulcanization method and tire |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911024730.4A CN110774494B (en) | 2019-10-25 | 2019-10-25 | Tire mold and processing method thereof, tire vulcanization method and tire |
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| CN110774494A CN110774494A (en) | 2020-02-11 |
| CN110774494B true CN110774494B (en) | 2021-12-31 |
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| CN111965201A (en) * | 2020-07-24 | 2020-11-20 | 中策橡胶集团有限公司 | Tire sidewall appearance evaluation method |
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| GB1457935A (en) * | 1973-09-04 | 1976-12-08 | Gen Tire & Rubber Co | In-mould coating composition and method of applying same |
| JP2003252012A (en) * | 2002-03-04 | 2003-09-09 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| CN101249780A (en) * | 2007-02-22 | 2008-08-27 | 东洋橡胶工业株式会社 | Inflatable pneumatic tyre |
| CN101837618A (en) * | 2009-11-16 | 2010-09-22 | 盐城森光橡胶制品有限公司 | Solid tire sulfuration technology for inner forming, outer heating and segment temperature control |
| CN102632032A (en) * | 2012-05-02 | 2012-08-15 | 山东理工大学 | Surface treatment method of steel tire mould |
| CN104451523A (en) * | 2014-10-30 | 2015-03-25 | 程敬卿 | Remanufacturing process of tire mold |
| CN106738512A (en) * | 2016-12-13 | 2017-05-31 | 柳州通为机械有限公司 | Oblique rubber tire placenta |
| CN107109109A (en) * | 2014-12-02 | 2017-08-29 | 日本发条株式会社 | Aerosol coating composition and the metal mechanical part with its coating |
| CN109880195A (en) * | 2019-02-22 | 2019-06-14 | 东莞市普凯塑料科技有限公司 | Plastics matt master and preparation method thereof and plastic products |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080149240A1 (en) * | 2006-12-20 | 2008-06-26 | Luneau Michael J | Method for curing non-uniform, rubber articles such as tires |
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2019
- 2019-10-25 CN CN201911024730.4A patent/CN110774494B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1457935A (en) * | 1973-09-04 | 1976-12-08 | Gen Tire & Rubber Co | In-mould coating composition and method of applying same |
| JP2003252012A (en) * | 2002-03-04 | 2003-09-09 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| CN101249780A (en) * | 2007-02-22 | 2008-08-27 | 东洋橡胶工业株式会社 | Inflatable pneumatic tyre |
| CN101837618A (en) * | 2009-11-16 | 2010-09-22 | 盐城森光橡胶制品有限公司 | Solid tire sulfuration technology for inner forming, outer heating and segment temperature control |
| CN102632032A (en) * | 2012-05-02 | 2012-08-15 | 山东理工大学 | Surface treatment method of steel tire mould |
| CN104451523A (en) * | 2014-10-30 | 2015-03-25 | 程敬卿 | Remanufacturing process of tire mold |
| CN107109109A (en) * | 2014-12-02 | 2017-08-29 | 日本发条株式会社 | Aerosol coating composition and the metal mechanical part with its coating |
| CN106738512A (en) * | 2016-12-13 | 2017-05-31 | 柳州通为机械有限公司 | Oblique rubber tire placenta |
| CN109880195A (en) * | 2019-02-22 | 2019-06-14 | 东莞市普凯塑料科技有限公司 | Plastics matt master and preparation method thereof and plastic products |
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