EP1585632A2 - Tire mold and tread - Google Patents

Tire mold and tread

Info

Publication number
EP1585632A2
EP1585632A2 EP03815210A EP03815210A EP1585632A2 EP 1585632 A2 EP1585632 A2 EP 1585632A2 EP 03815210 A EP03815210 A EP 03815210A EP 03815210 A EP03815210 A EP 03815210A EP 1585632 A2 EP1585632 A2 EP 1585632A2
Authority
EP
European Patent Office
Prior art keywords
tread
plates
mold
segments
tire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03815210A
Other languages
German (de)
French (fr)
Inventor
Chinglin Pan
Daniel Lefevre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Michelin Recherche et Technique SA Switzerland
Societe de Technologie Michelin SAS
Original Assignee
Michelin Recherche et Technique SA Switzerland
Societe de Technologie Michelin SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Michelin Recherche et Technique SA Switzerland, Societe de Technologie Michelin SAS filed Critical Michelin Recherche et Technique SA Switzerland
Publication of EP1585632A2 publication Critical patent/EP1585632A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
    • 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
    • B29C33/30—Mounting, exchanging or centering
    • 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
    • B29C33/30—Mounting, exchanging or centering
    • B29C33/301—Modular mould systems [MMS], i.e. moulds built up by stacking mould elements, e.g. plates, blocks, rods
    • B29C33/302—Assembling a large number of mould elements to constitute one cavity
    • 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)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D30/54—Retreading
    • B29D30/56—Retreading with prevulcanised tread
    • 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)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D30/58—Applying bands of rubber treads, i.e. applying camel backs
    • B29D2030/582—Venting air inclusions, e.g. air trapped between tread and carcass

Definitions

  • the present invention is in the field of tire molds. Background of the Invention During the molding of the tire, it is necessary to be able to evacuate all the air which might be imprisoned between the tire introduced into the mold and the different parts of the mold. If the slightest pocket of imprisoned air remains between the mold and the tire, this will cause a molding defect which appears on the outer surface of the tire. Such molding defects are unacceptable both from the standpoint of the quality of the tire manufactured and from the standpoint of its aesthetic appearance. Now, it is l ⁇ iown that it is impossible to assure total venting of a mold naturally, that is to say, by simply using the spaces between the different component parts of the mold in- order to assure the evacuation of the air. Recourse is therefore had to various palliatives, one of which is of general use in the tire industry, namely the drilling of small vent holes wherever necessary in the mold.
  • Figure 1 is an illustration of the tire tread mold of the present invention.
  • Figure 2 is an illustration of one plate of the tire tread mold of the present
  • Figure 3 shows a tread made with . the tire tread mold of the present invention.
  • FIG 4 is an enlargement of the tread shown in Figure 3.
  • the present invention is a process for making an entire truck tire tread comprising the steps of securing tread mold segments comprising plates to a flat backing, placing a blank tread on the mold segments, and pressing the blank tread against the mold segments.
  • the invention also comprises this process wherein the tread mold segments comprising plates are formed by the steps of machining at least one side of a plate so that the peak to peak variation of the plate surface is less than 5 microns, securing the plates to a flat backing;, and machining a reverse tread pattern onto the secured plates.
  • the present invention also comprises a process for making a mold for a tire tread comprising the steps of securing tread mold segments comprising plates of at least two different thicknesses to a flat backing, and machining a reverse head pattern comprising ridges onto the secured plates, where the thickness of the plate under the ridge is chosen so that the width to height ratio of a ridge on a plate is not less than 1:10.
  • the present invention is a process for making an entire truck tire tread comprising the steps of securing tread mold segments comprising plates to a flat backing, placing a blank tread on the mold segments, and pressing the blank tread against the mold segments.
  • the invention also comprises this process wherein the tread mold segments comprising plates are formed by the steps of machining at least one side of a plate so that the peak to peak variation of the plate surface is less than 5 microns, securing the plates to a flat backing; and macMning a reverse tread pattern onto the secured plates.
  • the present invention also comprises a process for making a mold for a tire tread comprising the steps of securing tread mold segments comprising plates of at least two different thicknesses to a flat backing, and machining a reverse tread pattern comprising ridges onto the secured plates, where the thickness of the plate under the ridge is chosen so that the width to height ratio of a ridge on a plate is not less than 1:10.
  • Figure 1 hows one embodiment of a segment of the tire tread mold ⁇ 10) of the present invention.
  • Flat plates (20) are secured together, forming a segment of the complete mold.
  • the plates (20) are secured by means of rods (60) . extending through apertures (50) in the plates.
  • End piece (70) secures the plates together.
  • a reverse of a tread pattern has been machined onto one side of the mold (10).
  • This pattern comprises various ridges (40) and depressions (45).
  • the plates (20) begin as blanks, such as shown in Figure 2
  • the plates are made of aluminum approximately 10 millimeters thick.
  • the plates are roughened on one or both of their major sides, so that the peak to peak maximum height difference on the machined surface is about 0.005 millimeters. This roughness permits venting of gases between the plates during the tread mold process, but is small enough to prevent the formation of flashing.
  • a tread pattern is then machined onto the clamped-together plates (see Figure 1).
  • the reverse tread pattern comprises ridges (40) and depressions (45).
  • the height to width ratio of a ridge is no greater than 10:1. This preserves the strength of the tread mold pattern.
  • the plates are of at least two different thicknesses.- That way, plates can be selected such that a ridge supported by a plate has a height to width ratio no greater than 10:1. In other words, thin features in the tread mold do not lie across two plates.
  • Figure 4 is an enlargement of the tread shown in Figure 3
  • Figure 4 shows almost unobservabie lines of flashing ( 100), less than 0J millimeter high.
  • the use of the present invention results in a greatly improved tread appearance.
  • the invention may be further understood by means of the following non-limiting example.
  • a mold was constructed for a 215/65R16XZE-SA tire tread. Both sides of 6061 aluminum plate (3/8" or 9.525 mm) were roughened to permit venting, and clamped together. The tread pattern was machined into three sectors of tread (total length 889 millimeters). The mold face was then sandblasted. The sectors were secured in a press, and a. total of seven cures were made. The process was then repeated.
  • FIG. 3 and Figure 4 show the results of the process.
  • Venting performance The testing sectors were placed in the middle of the press, which is the worst position for causing venting quality control issues. After all 14 cures, none of the treads made by the test sectors had any venting quality control deficiencies. Besides that, even the backside of the sculpture had no venting deficiencies for all test 5 treads. This has been a venting problem for this particular sculpture. That means air pockets trapped on the backside of the tread may penetrate the rubber and vent through the gap in between the plates.
  • Tire aspect The overall appearance is much better than a mono-block mold with vents made by a direct machining process. It looks the same- as a new tire by the Michelhi Id aspect standard. The stepping on the summit in -between the plates is mimmal They are visible, but not measurable.
  • Flashing There was no flashing on one of the sectors with all plates machined on one side for the first curing test. There was no flashing on any of the 3 sectors for the second curing test. For that test, one sector had plates machined on one side, and other 5 two sectors had plates machined on both sides.
  • the tread surface finish has the same quality as treads made by any other process
  • the misalignment in-between the sectors was minimal. They are visible, but not measurable. That implied that the accuracy of the sector length and CNC machine three- dimensional accuracy is good. We expect that the three-dimensional accuracy of the mold 0 will be within several hundredths of a millimeter.
  • the summit has sharp comers; the aspect around the summit is much cleaner and neat looking.
  • the minimum radius in between the groove wall and the tread surface is 1.0 mm. No visible steps were created using in ' different finish cutting tools. It is a common problem in the direct sculpture machfning process. That is because all the finish tools are set into precision length and the spindle assembly of the CNC machine has compensation

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Tyre Moulding (AREA)

Abstract

The present invention is a process for making an entire truck tire tread comprising the steps of securing tread mold segments comprising plates to a flat backing, placing a blank tread on the mold segments, and pressing the blank tread against the mold segments. The invention also comprises this process wherein the tread mold segments comprising plates are formed by the steps of machining at least one side of a plate so that the peak to peak variation of the plate surface is less than 5 microns, securing the plates to a flat backing; and machining a reverse tread pattern onto the secured plates. The present invention also comprises a process for making a mold for a tire tread comprising the steps of securing tread mold segments comprising plates of at least two different thicknesses to a flat backing, and machining a reverse tread pattern comprising ridges onto the secured plates, where the thickness of the plate under the ridge is chosen so that the width to height ratio of a ridge on a plate is not less than 1:10.

Description

Tire Mold and Tread
Field of the Invention
The present invention is in the field of tire molds. Background of the Invention During the molding of the tire, it is necessary to be able to evacuate all the air which might be imprisoned between the tire introduced into the mold and the different parts of the mold. If the slightest pocket of imprisoned air remains between the mold and the tire, this will cause a molding defect which appears on the outer surface of the tire. Such molding defects are unacceptable both from the standpoint of the quality of the tire manufactured and from the standpoint of its aesthetic appearance. Now, it is lαiown that it is impossible to assure total venting of a mold naturally, that is to say, by simply using the spaces between the different component parts of the mold in- order to assure the evacuation of the air. Recourse is therefore had to various palliatives, one of which is of general use in the tire industry, namely the drilling of small vent holes wherever necessary in the mold.
When sucb vents are used, a trace of them is seen on the molded tire in the form of small protuberances of rubber which extend from the surface of the tire. It is known that, as soon as an interstice exceeds a size of 0.05 mm, it is capable of assuring the venting, but at the same time it permits a slight leakage of raw rubber. Now, it is impossible to effect drillings of a diameter of less than 0.05 mm economically. For this reason, one continues to see on most tires a trace of the small- vent holes in the form of small protuberances extending from the surface of the tire. Brief Description of the Drawings
Figure 1 is an illustration of the tire tread mold of the present invention.
Figure 2 is an illustration of one plate of the tire tread mold of the present
invention. Figure 3 shows a tread made with .the tire tread mold of the present invention. ■
Figure 4 is an enlargement of the tread shown in Figure 3. Summary of the Invention
The present invention is a process for making an entire truck tire tread comprising the steps of securing tread mold segments comprising plates to a flat backing, placing a blank tread on the mold segments, and pressing the blank tread against the mold segments. The invention also comprises this process wherein the tread mold segments comprising plates are formed by the steps of machining at least one side of a plate so that the peak to peak variation of the plate surface is less than 5 microns, securing the plates to a flat backing;, and machining a reverse tread pattern onto the secured plates. The present invention also comprises a process for making a mold for a tire tread comprising the steps of securing tread mold segments comprising plates of at least two different thicknesses to a flat backing, and machining a reverse head pattern comprising ridges onto the secured plates, where the thickness of the plate under the ridge is chosen so that the width to height ratio of a ridge on a plate is not less than 1:10. Detailed Description of the Invention
The present invention is a process for making an entire truck tire tread comprising the steps of securing tread mold segments comprising plates to a flat backing, placing a blank tread on the mold segments, and pressing the blank tread against the mold segments. The invention also comprises this process wherein the tread mold segments comprising plates are formed by the steps of machining at least one side of a plate so that the peak to peak variation of the plate surface is less than 5 microns, securing the plates to a flat backing; and macMning a reverse tread pattern onto the secured plates. The present invention also comprises a process for making a mold for a tire tread comprising the steps of securing tread mold segments comprising plates of at least two different thicknesses to a flat backing, and machining a reverse tread pattern comprising ridges onto the secured plates, where the thickness of the plate under the ridge is chosen so that the width to height ratio of a ridge on a plate is not less than 1:10. Figure 1 hows one embodiment of a segment of the tire tread mold < 10) of the present invention. Flat plates (20) are secured together, forming a segment of the complete mold. In this embodiment, the plates (20) are secured by means of rods (60) . extending through apertures (50) in the plates. End piece (70) secures the plates together. A reverse of a tread pattern has been machined onto one side of the mold (10). This pattern comprises various ridges (40) and depressions (45). According to the present invention, the plates (20) begin as blanks, such as shown in Figure 2 In one embodiment of the invention, the plates are made of aluminum approximately 10 millimeters thick. The plates are roughened on one or both of their major sides, so that the peak to peak maximum height difference on the machined surface is about 0.005 millimeters. This roughness permits venting of gases between the plates during the tread mold process, but is small enough to prevent the formation of flashing.
A tread pattern is then machined onto the clamped-together plates (see Figure 1). One example of a reverse of a tread pattern is shown. The reverse tread pattern comprises ridges (40) and depressions (45). In one embodiment of the invention, The height to width ratio of a ridge is no greater than 10:1. This preserves the strength of the tread mold pattern. In another embodiment of the invention, the plates are of at least two different thicknesses.- That way, plates can be selected such that a ridge supported by a plate has a height to width ratio no greater than 10:1. In other words, thin features in the tread mold do not lie across two plates.
The segment shown would placed onto a flat backing (not shown), and placed in a press. A blank tread (not shown) would be placed on the mold, and the end result would be a tire tread such as shown in Figure 3. Figure 4 is an enlargement of the tread shown in Figure 3
Figure 4 shows almost unobservabie lines of flashing ( 100), less than 0J millimeter high. Thus, the use of the present invention results in a greatly improved tread appearance.
The invention may be further understood by means of the following non-limiting example.
Example 1
A mold was constructed for a 215/65R16XZE-SA tire tread. Both sides of 6061 aluminum plate (3/8" or 9.525 mm) were roughened to permit venting, and clamped together. The tread pattern was machined into three sectors of tread (total length 889 millimeters). The mold face was then sandblasted. The sectors were secured in a press, and a. total of seven cures were made. The process was then repeated.
Figure 3 and Figure 4 show the results of the process. . Venting performance: The testing sectors were placed in the middle of the press, which is the worst position for causing venting quality control issues. After all 14 cures, none of the treads made by the test sectors had any venting quality control deficiencies. Besides that, even the backside of the sculpture had no venting deficiencies for all test 5 treads. This has been a venting problem for this particular sculpture. That means air pockets trapped on the backside of the tread may penetrate the rubber and vent through the gap in between the plates.
Tire aspect: The overall appearance is much better than a mono-block mold with vents made by a direct machining process. It looks the same- as a new tire by the Michelhi Id aspect standard. The stepping on the summit in -between the plates is mimmal They are visible, but not measurable.
Flashing: There was no flashing on one of the sectors with all plates machined on one side for the first curing test. There was no flashing on any of the 3 sectors for the second curing test. For that test, one sector had plates machined on one side, and other 5 two sectors had plates machined on both sides.
The tread surface finish has the same quality as treads made by any other process The misalignment in-between the sectors was minimal. They are visible, but not measurable. That implied that the accuracy of the sector length and CNC machine three- dimensional accuracy is good. We expect that the three-dimensional accuracy of the mold 0 will be within several hundredths of a millimeter.
The summit has sharp comers; the aspect around the summit is much cleaner and neat looking. The minimum radius in between the groove wall and the tread surface is 1.0 mm. No visible steps were created using in 'different finish cutting tools. It is a common problem in the direct sculpture machfning process. That is because all the finish tools are set into precision length and the spindle assembly of the CNC machine has compensation
for thermal expansion.

Claims

We claim:
• 1. A process for making- an entire truck tire tread comprising the steps of: (a) securing tread mold segments comprising plates to a flat backing;
(b) placing a blank tread on the mold segments; and
(c) pressing the blank tread against the mold segments.
2. The process of claim 1, wherein the tread is greater than three meters in length.
3. The process of claim 1, wherein the tread mold segments comprising plates are formed by the steps of:
(a) machining at least one side of a plate so that the peak to pealc variation of the plate surface is less than 5 microns;
(b) securing the plates to a flat backing; and
(c) machining a reverse tread pattern onto the secured plates.
4. A process for making a mold for a tire tread comprising the steps of:
(a) securing tread mold segments comprising plates to a flat bacldng;
(b) machining a reverse tread pattern onto the secured plates; wherein the tread pattern comprises ridges, and the λvidth to height ratio of the ridges is not, less than 1 :10.
5. The process of claim 4, wherein the plates comprise aluminum
6. A tire tread mold comprising segments comprising plates secured to a flat backing, wherein some plates have widths greater than 2 millimeters different than other segments.
7. A tire tread comprising mold flashing wherein the flashing comprises lines less than 0.1 millimeter tall.
8. A mold for a tire tread comprising tread mold segments comprising plates of at least two different thicknesses.
9. The mold of claim 9, wherein the plates differ in thickness by at least 7 millimeters. 10 A process for making a mold for a tire head comprising the steps of:
(a) securing tread mold segments comprising plates of at least two different thicknesses to a flat backing;
(b) machining a reverse tread pattern comprising ridges onto the secured plates; wherein the fhiclcness of the plate under the ridge is chosen so that the width to height ratio of a ridge on a plate is not less than 1:101
EP03815210A 2003-01-06 2003-12-15 Tire mold and tread Withdrawn EP1585632A2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US43809903P 2003-01-06 2003-01-06
US438099P 2003-01-06
PCT/US2003/039785 WO2004062898A2 (en) 2003-01-06 2003-12-15 Tire mold and tread

Publications (1)

Publication Number Publication Date
EP1585632A2 true EP1585632A2 (en) 2005-10-19

Family

ID=32713275

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03815210A Withdrawn EP1585632A2 (en) 2003-01-06 2003-12-15 Tire mold and tread

Country Status (8)

Country Link
EP (1) EP1585632A2 (en)
JP (1) JP2006519120A (en)
KR (1) KR20050098857A (en)
CN (1) CN1735504A (en)
AU (1) AU2003297066A1 (en)
BR (1) BR0317952A (en)
CA (1) CA2512548A1 (en)
WO (1) WO2004062898A2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MY172998A (en) * 2008-09-03 2019-12-18 Khong Fah Liew Mould segments with indexing means and method of aligning mould segments
WO2011037447A1 (en) * 2009-09-28 2011-03-31 Low, Yoke Thye Mould segments with indexing means and method of aligning mould segments
US8731871B2 (en) 2010-09-22 2014-05-20 Bridgestone Americas Tire Operations, Llc Tire mold design method to minimize unique annular mold parts
AT512362A1 (en) * 2012-01-13 2013-07-15 Ifw Manfred Otte Gmbh Mold for a tool and the tool formed therefrom
CN104302470B (en) * 2012-05-31 2016-08-24 住友橡胶工业株式会社 Apparatus for mounting tread rings on tire base and method for manufacturing retreaded tires
EP3302949B1 (en) * 2015-05-26 2020-03-25 Bridgestone Bandag, LLC Method and apparatus for improved tread splicing

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1230275B (en) * 1989-06-14 1991-10-18 Marangoni Rts Spa PERFECTED TREAD, FOR THE RECONSTRUCTION OF TIRES FOR VEHICLES, AND MOLD USED FOR ITS REALIZATION.
DE69301059T2 (en) * 1992-05-13 1996-05-15 Sedepro Tire mold and method for molding a tire
JPH08300512A (en) * 1995-05-12 1996-11-19 Yokohama Rubber Co Ltd:The Mold for precured tread
AU1073099A (en) * 1998-10-08 2000-04-26 Goodyear Tire And Rubber Company, The Multiple insert tire mold and assembly method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004062898A2 *

Also Published As

Publication number Publication date
BR0317952A (en) 2005-11-29
WO2004062898A2 (en) 2004-07-29
CN1735504A (en) 2006-02-15
KR20050098857A (en) 2005-10-12
JP2006519120A (en) 2006-08-24
AU2003297066A1 (en) 2004-08-10
WO2004062898A3 (en) 2004-08-26
CA2512548A1 (en) 2004-07-29
AU2003297066A8 (en) 2004-08-10

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