CN110962383A - Method for retreading tire and retreaded tire - Google Patents
Method for retreading tire and retreaded tire Download PDFInfo
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- CN110962383A CN110962383A CN201811162461.3A CN201811162461A CN110962383A CN 110962383 A CN110962383 A CN 110962383A CN 201811162461 A CN201811162461 A CN 201811162461A CN 110962383 A CN110962383 A CN 110962383A
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- retreading
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 210000001503 joint Anatomy 0.000 claims abstract description 30
- 238000007689 inspection Methods 0.000 claims abstract description 28
- 238000005520 cutting process Methods 0.000 claims abstract description 25
- 238000005498 polishing Methods 0.000 claims abstract description 23
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 4
- 238000001125 extrusion Methods 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 238000004073 vulcanization Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000011324 bead Substances 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 238000005336 cracking Methods 0.000 claims description 6
- 238000009659 non-destructive testing Methods 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 230000032798 delamination Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000011109 contamination Methods 0.000 claims description 3
- 230000001605 fetal effect Effects 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000011800 void material Substances 0.000 claims description 3
- 206010058031 Joint adhesion Diseases 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
-
- 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
- B29D30/542—Retreading using envelopes or membranes provided with sealings for curing
-
- 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
- B29D2030/541—Abrading the tyre, e.g. buffing, to remove tread and/or sidewalls rubber, to prepare it for retreading
-
- 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
- B29D2030/545—Using chambers to apply heat and pressure, e.g. autoclaves for curing the retreaded tyres
-
- 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
- B29D2030/546—Measuring, detecting, monitoring, inspecting, controlling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tyre Moulding (AREA)
- Tires In General (AREA)
Abstract
The invention relates to a method for retreading a tire, which comprises the following steps: (1) and initial inspection: selecting a retreadable qualified tire body which meets the tire retreading standard; (2) and large grinding: polishing by using a full-automatic five-axis linkage polisher; (3) and (3) gluing the upper middle cushion: placing the tire into a middle cushion rubber extruder for inflation, extruding the tire at a high pressure into a discharge port of the extruder by utilizing a screw extrusion principle, and bonding the heated middle cushion rubber on the surface of the tire crown coated with the tread base rubber at a high pressure while rotating; (4) and tire tread fitting: adhering the pre-vulcanized tread rubber on the surface of a tire according to the corresponding size, and pressing after obliquely cutting and butting joints; (5) and an upper encapsulating sleeve: the formed retreaded tire is put into a flexible inner and outer envelope sleeve and then vacuumized; (6) and vulcanizing: and vulcanizing the tire with the surface tightly attached to the inner and outer encapsulating sleeves. The invention increases the butt joint adhesion area of the joint by bias cutting, and increases the tensile resistance.
Description
Technical Field
The invention relates to the field of tire production, in particular to a tire retreading method and a retreaded tire.
Background
In the traditional tread rubber butt joint process, the tread is directly cut according to the butt joint length, and joints are vertically butted. The butt joint area of the joint is small due to the direct cutting, and the tensile resistance is poor; in the process of tread pasting, the tire has a certain stretching; particularly, in the case of a tread having a small tread thickness, the reliability of the abutment cannot be ensured. Finally, the situation that the joint is cracked frequently occurs in the process of loading the tire into a vehicle and using the tire. The cracking is intensified by repeated ground-holding friction in the tire, and finally, delamination, tread chipping or falling-off occurs. At this point, the tire is unloaded for a secondary treatment. On one hand, the use cost of the tire is increased, and waste is caused; on the other hand, the running efficiency of the vehicle is influenced, potential safety hazards exist under severe conditions, and the safety of driving and pedestrians is threatened. Secondly, the heating temperature of the traditional process is 115-120 ℃, the high temperature can cause secondary damage to the tire body rubber, and the aging of the tire body rubber is accelerated due to the high temperature, so that the service life of the tire is shortened.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for retreading a tire and a retreaded tire, wherein the method is used for increasing the butt joint adhesion area of a joint by bias cutting, increasing the tensile resistance and reducing the later use cracking condition.
The technical scheme for realizing the purpose of the invention is as follows: a method of retreading a tire comprising the steps of:
(1) and initial inspection: selecting a retreadable qualified tire body meeting the tire retreading standard by checking the tire crown, the tire shoulder, the tire side, the tire bead and the tire liner of the tire, and cleaning the tire body;
(2) and large grinding: setting polishing parameters by using a full-automatic five-axis linkage polishing machine, and polishing to obtain a polishing roughness of between RAM3 and 5;
(3) and (3) gluing the upper middle cushion: placing the tire into a middle cushion rubber extruder for inflation, heating and extruding middle cushion rubber at the heating temperature of 80 ℃ by utilizing the screw extrusion principle, extruding the tire at a high pressure at a discharge port of the extruder, adhering the heated middle cushion rubber to the surface of the tire crown coated with tread base rubber at a high pressure while rotating, wherein the adhesive thickness of the middle cushion rubber is 1.5-2 mm;
(4) and tire tread fitting: sticking the pre-vulcanized tread rubber on the surface of a tire according to the corresponding size, and pressing after obliquely cutting a joint and splicing the head and the tail;
(5) and an upper encapsulating sleeve: the molded retreaded tire is put into a flexible inner and outer encapsulating sleeve with vulcanization grains inside, and then the inner and outer encapsulating sleeve is vacuumized to be tightly attached to the surface of the tire;
(6) and vulcanizing: the tire with the surface tightly attached to the inner and outer encapsulating sleeves is vulcanized, the vulcanizing tank adopts a differential pressure vulcanizing mode, the vulcanizing tank detects and adjusts the pressure of each part constantly, and the pressure is kept stable at any time.
The step (1) of the technical scheme comprises the following steps: A. manual inspection items:
checking a crown: blasting, pricking, delaminating;
checking a tire shoulder: delaminating;
and (3) checking the tire side: aging, cracking, contamination, cutting;
bead checking: cutting, delamination, deformation;
checking the fetal lining: grinding, breaking and nailing holes;
B. equipment inspection items:
holographic inspection: detecting whether the inner part of the tire has bulging or void by using a laser speckle inspection machine;
and (3) nail hole inspection: the method comprises the following steps of (1) utilizing an NDT (non-destructive testing) inspection machine to inspect whether the tire is punctured through by a high-voltage discharge principle;
high-pressure inspection: the tire is inflated at high pressure by using a high-pressure inspection machine, and the strength of the tire body of the tire is inspected.
According to the technical scheme, the polishing parameters in the step (2) are as follows:
sanding reserve thickness, i.e. base glue to wire layer thickness: 1.5-2 mm;
and (3) polishing radian: 500-800 mm;
chamfering angle: 30-50 degrees;
chamfer radius: 2-3 mm;
the polishing height of the sidewall is 100-200 mm;
feed amount: 1-3 mm.
The bias cutting process in the step (4) in the technical scheme specifically comprises the following steps:
① reserving butt joints according to the actual circumference of the ground tire, cutting the strip-shaped pre-vulcanized tread rubber by using a corresponding tool, wherein the section presents an inclined plane with a set angle with the horizontal plane, and performing the same treatment on the two butt joints;
② cutting, and processing the cross section with a soft steel wire brush, wherein on one hand, the rubber powder of the cross section is processed, and on the other hand, the cross section has a certain roughness;
③ brushing a layer of adhesive cement on the upper and lower sections, naturally standing for 2-3 min, sticking a middle adhesive tape, butting and compacting the joints, and transversely fixing with a pneumatic nailing gun;
④ and for the shoulder chamfer area, a high-strength rubber sheet with corresponding width is circumferentially stuck for covering and connecting the joint seal of the tread and the tire body.
The tooling in the technical scheme is provided with a tread clamping device; the upper surface and the lower surface of the tread clamping device are set to form a slope of 30 degrees with the horizontal plane, and are transversely provided with sliding grooves for stepping on a knife; after the clamping device is fixed, starting the cut-off knife; the cutter advances horizontally to cut the tread.
In the technical scheme, the vulcanization time in the step (6) is 3.5 hours, the vulcanization temperature is 99 ℃, and the pressure of a vulcanizing tank, namely external pressure is 6Kg/c square meter, and the pressure of a tire, namely internal pressure is 8.0Kg/c square meter; DPC pressure is 4.8Kg/c square meter.
A tire comprising a carcass, a portion of the carcass contacting a rim being a rim, a tread of the carcass having a pattern; the method is characterized in that: the circumferential direction of the tire body is provided with joints in end-to-end butt joint; the section of the joint is an inclined plane parallel to the central axis of the tire body; the inclination angle of the inclined plane is 30 degrees.
According to the technical scheme, the inclined plane at one end of the joint is provided with the grooves which are uniformly distributed, and the inclined plane at the other end of the joint is provided with the bulges matched with the grooves.
According to the technical scheme, the end parts of the inclined planes of the joints are in a sawtooth shape and are arranged in a staggered mode.
A tire comprising a carcass, a portion of the carcass contacting a rim being a rim, a tread of the carcass having a pattern; the method is characterized in that: the circumferential direction of the tire body is provided with joints which are butted end to end, and the tire body is unfolded into a parallelogram; the section of the joint is an inclined plane.
After the technical scheme is adopted, the invention has the following positive effects:
(1) the bias cutting butt joint process provided by the invention overcomes the defects of direct cutting butt joint of the traditional joint, and requires a bias cutting tool and a cutter to increase the butt joint adhesion area of the joint, increase the tensile resistance and solve the problem of cracking in later use when the pre-vulcanized tread rubber is in butt joint.
(2) Different from the traditional process, the tire shoulder processing method is characterized in that two tire shoulders are provided with circular arcs according to the set chamfer polishing radian and chamfer radius, so that the subsequent tire shoulder rubber strips can be attached conveniently, and the tire shoulder processing process requirements can be met.
(3) The formed retreaded tire is put into a flexible inner and outer envelope sleeve and then vacuumized, so that the retreaded tire is isolated from water vapor and air during vulcanization; the encapsulating sleeve can ensure that all pressure applied to the tire tread is uniform, and the tire tread is prevented from being damaged; after vacuumizing, the inner and outer packing sleeves are tightly attached to the surface of the tire, and the tire is positioned in a closed space through the inner and outer packing sleeves to be vulcanized.
(4) According to the invention, the encapsulating sleeve is specially treated, and the vulcanizing lines are added in the encapsulating sleeve, so that the circumferential line distribution is formed after the rubber sheet in the tire shoulder chamfer area is vulcanized and formed, and the tire is more attractive.
(5) According to the invention, low-temperature vulcanization is adopted, the vulcanization temperature is 99 ℃, and the heating temperature in the traditional process is 115-120 ℃, so that the low-temperature vulcanization avoids secondary damage of high temperature to the tire body rubber, the aging of the tire body rubber is prevented from being accelerated due to the high temperature, and the service life of the tire is shortened.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a flow diagram of a tire retreading process of the present invention;
FIG. 2 is a schematic structural view of a tire of the present invention;
FIG. 3 is a first schematic view of the structure of the joint bevels of the tires of examples 2 and 3 of the present invention;
FIG. 4 is a second schematic view of the structure of the joint bevels of the tires of examples 2 and 3 of the present invention;
FIG. 5 is a schematic view of the joint structure of a tire according to example 2 of the present invention;
FIG. 6 is a schematic view of a joint structure of a tire according to example 3 of the present invention;
FIG. 7 is a partially developed schematic view of a tire body of example 3 of the present invention.
Detailed Description
Example 1A method for retreading a tire
Referring to fig. 1, the present invention is a method of retreading a tire comprising the steps of:
(1) and initial inspection: selecting a retreadable qualified tire body meeting the tire retreading standard by checking the tire crown, the tire shoulder, the tire side, the tire bead and the tire liner of the tire, and cleaning the tire body;
(2) and large grinding: setting polishing parameters by using a full-automatic five-axis linkage polishing machine, and polishing to obtain a polishing roughness of between RAM3 and 5;
(3) and (3) gluing the upper middle cushion: placing the tire into a middle cushion rubber extruder for inflation, heating and extruding middle cushion rubber at the heating temperature of 80 ℃ by utilizing the screw extrusion principle, extruding the tire at a high pressure at a discharge port of the extruder, adhering the heated middle cushion rubber to the surface of the tire crown coated with tread base rubber at a high pressure while rotating, wherein the adhesive thickness of the middle cushion rubber is 1.5-2 mm;
(4) and tire tread fitting: sticking the pre-vulcanized tread rubber on the surface of a tire according to the corresponding size, and pressing after obliquely cutting a joint and splicing the head and the tail;
(5) and an upper encapsulating sleeve: the molded retreaded tire is put into a flexible inner and outer encapsulating sleeve with vulcanization grains inside, and then the inner and outer encapsulating sleeve is vacuumized to be tightly attached to the surface of the tire;
(6) and vulcanizing: the tire with the surface tightly attached to the inner and outer encapsulating sleeves is vulcanized, the vulcanizing tank adopts a differential pressure vulcanizing mode, the vulcanizing tank detects and adjusts the pressure of each part constantly, and the pressure is kept stable at any time.
The step (1) of the technical scheme comprises the following steps: A. manual inspection items:
checking a crown: blasting, pricking, delaminating;
checking a tire shoulder: delaminating;
and (3) checking the tire side: aging, cracking, contamination, cutting;
bead checking: cutting, delamination, deformation;
checking the fetal lining: grinding, breaking and nailing holes;
B. equipment inspection items:
holographic inspection: detecting whether the inner part of the tire has bulging or void by using a laser speckle inspection machine;
and (3) nail hole inspection: the method comprises the following steps of (1) utilizing an NDT (non-destructive testing) inspection machine to inspect whether the tire is punctured through by a high-voltage discharge principle;
high-pressure inspection: the tire is inflated at high pressure by using a high-pressure inspection machine, and the strength of the tire body of the tire is inspected.
According to the technical scheme, the polishing parameters in the step (2) are as follows:
sanding reserve thickness, i.e. base glue to wire layer thickness: 1.5-2 mm;
and (3) polishing radian: 500-800 mm;
chamfering angle: 30-50 degrees;
chamfer radius: 2-3 mm;
the polishing height of the sidewall is 100-200 mm;
feed amount: 1-3 mm.
The bias cutting process in the step (4) in the technical scheme specifically comprises the following steps:
① reserving butt joints according to the actual circumference of the ground tire, cutting the strip-shaped pre-vulcanized tread rubber by using a corresponding tool, wherein the section presents an inclined plane with a set angle with the horizontal plane, and performing the same treatment on the two butt joints;
② cutting, and processing the cross section with a soft steel wire brush, wherein on one hand, the rubber powder of the cross section is processed, and on the other hand, the cross section has a certain roughness;
③ brushing a layer of adhesive cement on the upper and lower sections, naturally standing for 2-3 min, sticking a middle adhesive tape, butting and compacting the joints, and transversely fixing with a pneumatic nailing gun;
④ and for the shoulder chamfer area, a high-strength rubber sheet with corresponding width is circumferentially stuck for covering and connecting the joint seal of the tread and the tire body.
The tooling in the technical scheme is provided with a tread clamping device; the upper surface and the lower surface of the tread clamping device are set to form a slope of 30 degrees with the horizontal plane, and are transversely provided with sliding grooves for stepping on a knife; after the clamping device is fixed, starting the cut-off knife; the cutter advances horizontally to cut the tread.
In the technical scheme, the vulcanization time in the step (6) is 3.5 hours, the vulcanization temperature is 99 ℃, and the pressure of a vulcanizing tank, namely external pressure is 6Kg/c square meter, and the pressure of a tire, namely internal pressure is 8.0Kg/c square meter; DPC pressure is 4.8Kg/c square meter.
(example 2)
Referring to fig. 2 to 5, a tire comprises a tire body, wherein the part of the tire body contacting a steel rim is a rim, and the tread of the tire body is provided with a pattern; the circumferential direction of the tire body is provided with joints in end-to-end butt joint; the section of the joint 1 is an inclined plane 2 parallel to the central axis of the tyre body; the inclination angle of the inclined plane 2 is 30 degrees.
The inclined plane of one end of the joint 1 is provided with evenly distributed grooves 3, and the inclined plane of the other end is provided with bulges 4 matched with the grooves 3. The end parts of the inclined planes of the joints 1 are all in a sawtooth shape and are arranged in a staggered mode.
(example 3)
2-4, and 6-7, a retreaded tire includes a carcass, a portion of the carcass contacting a rim being a bead, a tread of the carcass having a pattern; the circumferential direction of the tire body is provided with joints 1 which are butted end to end, and the tire body is unfolded into a parallelogram.
The cross section of the joint 1 is a bevel 2. The inclined plane of one end of the joint 1 is provided with evenly distributed grooves 4, and the inclined plane of the other end is provided with protrusions 3 matched with the grooves 4.
The end parts of the inclined planes 2 of the joints 1 are all in a sawtooth shape 5 and are arranged in a staggered way.
The included angle between the inclined plane 2 and the horizontal direction is 30-60 degrees.
The acute angle of a parallelogram formed by unfolding the tire body is 30-45 degrees.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of retreading a tire characterized by: the method comprises the following steps:
(1) and initial inspection: selecting a retreadable qualified tire body meeting the tire retreading standard by checking the tire crown, the tire shoulder, the tire side, the tire bead and the tire liner of the tire, and cleaning the tire body;
(2) and large grinding: setting polishing parameters by using a full-automatic five-axis linkage polishing machine, and polishing to obtain a polishing roughness of between RAM3 and 5;
(3) and (3) gluing the upper middle cushion: placing the tire into a middle cushion rubber extruder for inflation, heating and extruding middle cushion rubber at the heating temperature of 80 ℃ by utilizing the screw extrusion principle, extruding the tire at a high pressure at a discharge port of the extruder, adhering the heated middle cushion rubber to the surface of the tire crown coated with tread base rubber at a high pressure while rotating, wherein the adhesive thickness of the middle cushion rubber is 1.5-2 mm;
(4) and tire tread fitting: sticking the pre-vulcanized tread rubber on the surface of a tire according to the corresponding size, and pressing after obliquely cutting a joint and splicing the head and the tail;
(5) and an upper encapsulating sleeve: the molded retreaded tire is put into a flexible inner and outer encapsulating sleeve with vulcanization grains inside, and then the inner and outer encapsulating sleeve is vacuumized to be tightly attached to the surface of the tire;
(6) and vulcanizing: the tire with the surface tightly attached to the inner and outer encapsulating sleeves is vulcanized, the vulcanizing tank adopts a differential pressure vulcanizing mode, the vulcanizing tank detects and adjusts the pressure of each part constantly, and the pressure is kept stable at any time.
2. The method of tire retreading as recited in claim 1, wherein: the step (1) comprises the following steps: A. manual inspection items:
checking a crown: blasting, pricking, delaminating;
checking a tire shoulder: delaminating;
and (3) checking the tire side: aging, cracking, contamination, cutting;
bead checking: cutting, delamination, deformation;
checking the fetal lining: grinding, breaking and nailing holes;
B. equipment inspection items:
holographic inspection: detecting whether the inner part of the tire has bulging or void by using a laser speckle inspection machine;
and (3) nail hole inspection: the method comprises the following steps of (1) utilizing an NDT (non-destructive testing) inspection machine to inspect whether the tire is punctured through by a high-voltage discharge principle;
high-pressure inspection: the tire is inflated at high pressure by using a high-pressure inspection machine, and the strength of the tire body of the tire is inspected.
3. The method of tire retreading as recited in claim 1, wherein: the polishing parameters in the step (2) are as follows:
sanding reserve thickness, i.e. base glue to wire layer thickness: 1.5-2 mm;
and (3) polishing radian: 500-800 mm;
chamfering angle: 30-50 degrees;
chamfer radius: 2-3 mm;
the polishing height of the sidewall is 100-200 mm;
feed amount: 1-3 mm.
4. The method of tire retreading as recited in claim 1, wherein: the bias cutting process in the step (4) specifically comprises the following steps:
① reserving butt joints according to the actual circumference of the ground tire, cutting the strip-shaped pre-vulcanized tread rubber by using a corresponding tool, wherein the section presents an inclined plane with a set angle with the horizontal plane, and performing the same treatment on the two butt joints;
② cutting, and processing the cross section with a soft steel wire brush, wherein on one hand, the rubber powder of the cross section is processed, and on the other hand, the cross section has a certain roughness;
③ brushing a layer of adhesive cement on the upper and lower sections, naturally standing for 2-3 min, sticking a middle adhesive tape, butting and compacting the joints, and transversely fixing with a pneumatic nailing gun;
④ and for the shoulder chamfer area, a high-strength rubber sheet with corresponding width is circumferentially stuck for covering and connecting the joint seal of the tread and the tire body.
5. The method of tire retreading as recited in claim 4, wherein: the tooling is provided with a tread clamping device; the upper surface and the lower surface of the tread clamping device are set to form a slope of 30 degrees with the horizontal plane, and are transversely provided with sliding grooves for stepping on a knife; after the clamping device is fixed, starting the cut-off knife; the cutter advances horizontally to cut the tread.
6. The method of tire retreading as recited in claim 1, wherein: the vulcanization time in the step (6) is 3.5 hours, the vulcanization temperature is 99 ℃, and the pressure of a vulcanizing tank, namely external pressure is 6Kg/c square meter, and the pressure of a tire, namely internal pressure is 8.0Kg/c square meter; DPC pressure is 4.8Kg/c square meter.
7. A tire made according to the method of claim 1, comprising a carcass, the portion of the carcass contacting the rim being a tread, the tread of the carcass having a pattern; the method is characterized in that: the circumferential direction of the tire body is provided with joints in end-to-end butt joint; the section of the joint is an inclined plane parallel to the central axis of the tire body; the inclination angle of the inclined plane is 30 degrees.
8. The tire of claim 7, wherein; the inclined plane of one end of the joint is provided with uniformly distributed grooves, and the inclined plane of the other end of the joint is provided with bulges matched with the grooves.
9. The tire of claim 7, wherein; the end parts of the inclined planes of the joints are in a sawtooth shape and are arranged in a staggered mode.
10. A tire made according to the method of claim 1, comprising a carcass, the portion of the carcass contacting the rim being a tread, the tread of the carcass having a pattern; the method is characterized in that: the circumferential direction of the tire body is provided with joints which are butted end to end, and the tire body is unfolded into a parallelogram; the section of the joint is an inclined plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811162461.3A CN110962383A (en) | 2018-09-30 | 2018-09-30 | Method for retreading tire and retreaded tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811162461.3A CN110962383A (en) | 2018-09-30 | 2018-09-30 | Method for retreading tire and retreaded tire |
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| Publication Number | Publication Date |
|---|---|
| CN110962383A true CN110962383A (en) | 2020-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811162461.3A Pending CN110962383A (en) | 2018-09-30 | 2018-09-30 | Method for retreading tire and retreaded tire |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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