CN111823487A - Extrusion and injection composite molding inflation-free tire and processing method thereof - Google Patents
Extrusion and injection composite molding inflation-free tire and processing method thereof Download PDFInfo
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- CN111823487A CN111823487A CN202010815228.1A CN202010815228A CN111823487A CN 111823487 A CN111823487 A CN 111823487A CN 202010815228 A CN202010815228 A CN 202010815228A CN 111823487 A CN111823487 A CN 111823487A
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C7/00—Non-inflatable or solid tyres
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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
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Abstract
The invention discloses an extrusion and injection composite molding inflation-free tire and a processing method thereof, belonging to the technical field of inflation-free tire molding. The invention relates to an extrusion and injection composite molding inflation-free tire and a processing method thereof, which comprises an inner tire layer, wherein the middle part of the inner tire layer is provided with a bladder cavity along the circumferential direction; the composite tire layer is sleeved on the outer layer of the inner tire layer in a coaxial adaptive manner, elastic framework materials are wound in threaded concave-convex grooves of a partially crosslinked and vulcanized tire body, preprocessing processing such as gum dipping is needed to be carried out on the framework materials before winding, so that the intersection of the inner tire layer and the outer tire layer is more compact by means of mutual embedding of the threaded concave-convex grooves, functions such as load and comfort are enabled to have definite division work, and the problem that the tire joints existing in the traditional tire production process are uneven can be solved to a certain extent.
Description
Technical Field
The invention relates to the technical field of inflation-free tire molding, in particular to an extrusion and injection composite molding inflation-free tire and a processing method thereof.
Background
The tire is divided into a pneumatic tire and a non-pneumatic tire, and is widely used in view of the fact that the conventional pneumatic tire is mature in production process, good in riding comfort and good in bearing capacity due to cushioning. However, as a large number of vehicle driving safety accidents are more and more caused by tire burst, abrasion and unstable running, the inflation-free tire has no inner tube, and the inflation-free tire has the advantages of high safety, energy conservation, environmental protection and the like, so that people pay more attention to the tire. The non-pneumatic tire is divided into a solid tire and a hollow tire, and the hollow tire greatly overcomes the defect of jolt caused by insufficient resilience in the riding process of the non-pneumatic tire.
Through retrieval, in order to solve the problems, such as Chinese patent, the publication numbers are as follows: CN109109352A, published as: 1 month and 1 day 2019; disclosed is a one-time injection, hollow and vulcanization molding production method of rubber products, which can complete the injection, hollow and vulcanization processes in the same mold cavity, wherein the mold cavity comprises an upper half mold, a lower half mold and a mold core, the mold core lays a foundation for the hollow of the mold cavity, the hollow mold has the condition of filling high-temperature and high-pressure gas required by vulcanization, and further integrates the injection molding, hollow and vulcanization devices, thereby avoiding the heat loss and process flow cost caused by the flow of each process in the prior art, greatly improving the defect of complex process in the traditional process, simplifying the manufacturing process, but through the use of the process, the process can theoretically realize full-automatic production, but when the hollow tire is vulcanized and molded in the actual production process, high-temperature gas or compressed air and the like need to be introduced to heat the inner cavity of the hollow tire, the yield of the hollow tire is found to be low, meanwhile, high-temperature gas or compressed air and the like are needed to be generated in the operation process of equipment, so that potential safety hazards exist, the responsible coefficient of the product implementation process is increased, and large-scale industrial production is difficult to realize.
For another example, the conventional non-pneumatic tire represents a non-pneumatic hollow tire produced by Jiangxi tires, and the non-pneumatic hollow tire proposed by the company improves the comfort of the solid tire by arranging a hollow porous structure on the basis of the conventional solid tire, and the adopted screw extruder and the porous die head extrude a tubular tire blank to obtain the non-pneumatic hollow tire by the butt joint molding process and the conventional die pressing vulcanization molding; the bicycle has the advantages of no need of inflation, convenient maintenance, long service life, puncture resistance, wear resistance and the like, and has the disadvantages that the comfort problem in riding is not fundamentally solved, the tire body can only be designed in a miniaturized manner, and the production process is relatively complex.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the problems of untight combination of butt joints of the inflation-free hollow tire manufactured in the prior art and the like, the invention provides an extrusion and injection composite molding inflation-free tire and a processing method thereof.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
an extrusion and injection composite molding inflation-free tire comprises a tire body, wherein the tire body comprises an inner tire layer, the middle part of the inner tire layer is provided with a bladder cavity along the circumferential direction of the inner tire layer, and the defect of bumping caused by insufficient resilience in the riding process of the inflation-free tire can be solved to a great extent; the tire tube layer is characterized in that a thread-shaped concave-convex groove is formed in the outer peripheral surface of the tire tube layer, the outer layer is sleeved with the composite tire layer in a coaxial adaptive mode, the thread-shaped concave-convex groove formed between the outer peripheral surface of the tire tube layer and the composite tire layer is a thread-shaped concave-convex groove I connected in a circular arc shape, the intersection of the inner tire layer and the outer tire layer is embedded into a whole by means of the thread-shaped concave-convex groove I, and the two tire layers are vulcanized and cross-linked to be integrated into a whole so as to solve the safety problems that the tire joint.
Further technical scheme, the screw thread type tongue and groove that forms between inner tube layer periphery and the compound child layer is the screw thread type tongue and groove II that V-arrangement links to each other to make the area of contact increase of two kinds of child layer combination departments inside and outside making the combination inseparabler, in order to guarantee the effectual adhesion of interior child layer and compound child layer, thereby effectively solve tire joint department homogeneity problem.
According to the further technical scheme, the inner tire layer is made of an extruded rubber material A, the extruded rubber material A is heavily loaded and has framework material performance, so that a formed tire is accurately and better optimized, and the structural strength of the tire is improved; the composite tire layer is made of an injection rubber material B, the injection rubber material B is mainly used for comfort, so that the tire is good in wear resistance, flexing resistance, wet skid resistance and buffering performance, after the rubber material A and the outer layer composite injection rubber material B are extruded, functions such as load and comfort have definite division of labor on the premise of safety, and the problem that the tire joint is not uniform in the traditional tire production process can be solved to a certain extent.
A processing method for extruding and injecting a composite molding non-pneumatic tire comprises the following steps:
step one, extruding a tubular inner tire layer: adding a sizing material A into a screw extruder, and further extruding a tubular inner tire layer;
step two, opening the die A: cutting the extruded tubular inner tube layer according to the size of the tire, butt-jointing the extruded tubular inner tube layer end to end for molding, and then placing the molded tubular inner tube layer in a mold A on a flat vulcanizing machine for mold closing;
step three, partial crosslinking and vulcanization: inserting an inflation pipe along the direction vertical to the inner circumferential surface of the tire body, introducing compressed air into the bladder cavity of the inner tire layer, wherein the input compressed air is about 1.0MPa, so that the compressed air fills the whole bladder cavity, and then molding an upper mold and a lower mold of the mold A to complete partial cross-linking vulcanization, thereby weakening the joint stress and strengthening the comprehensive performance;
step four, opening the die of the die B: taking out the partially crosslinked and vulcanized tire body from the mold A, then placing the tire body into a mold B on an injection machine, placing the tire body by depending on the inner cavity of the mold, and combining the molds;
step five, injecting a sizing material B: injecting the rubber material B into the mold B through an injection machine until the rubber material B is filled in the mold, and forming a composite tire layer on the periphery of the inner tire layer to ensure that the outer part of the tire body of the tire is wear-resistant and skid-resistant;
step six, vulcanization molding: compressed air is introduced into a bladder cavity of the compounded tire body, the input compressed air is about 1.0MPa, so that the whole bladder cavity is filled with the compressed air, vulcanization molding is carried out, and the injected rubber and an inner tire layer are vulcanized, cross-linked and combined to form a unified whole, so that the joint hidden danger is solved, namely, the joint is over-tight, the joint is in a convex state, the shape of the internal structure is suddenly changed, bumping is easy to occur, and the riding comfort is poor; connect the relaxation, the sunken state appears in joint department, easily takes place to jolt, can break off even, and the travelling comfort is poor and there is the potential safety hazard great.
In the second step, an air hole is formed in the inner peripheral surface of the mold A, and an inflation tube is inserted in the direction vertical to the inner peripheral surface of the tire body, so that compressed air is introduced into a bladder cavity through hole of the inner tire layer, the bladder cavity is filled with compressed air in the subsequent crosslinking vulcanization process, the deformation of the bladder cavity channel caused by the pressure generated by mold pressing is prevented, and the better vulcanization of the rubber material in the bladder cavity channel is promoted; the inner wall of the mold forming cavity A is provided with a threaded concave-convex structure, so that a corresponding threaded concave-convex groove is formed on the outer peripheral surface of the inner tire layer molded by the mold forming cavity A, and the inner peripheral surface of the composite tire layer formed after the rubber material B is injected is matched with the threaded concave-convex groove on the outer peripheral surface of the inner tire layer, so that the inner tire layer serves as a structural member of a support frame and bears the load of a tire, the buffer action and the like; the composite tire layer formed by the injected rubber compound B is used as a tire tread to play roles of wear resistance, skid resistance and the like, so that the two advantages of an extrusion process and an injection process are integrated.
According to the further technical scheme, in the fourth step, the thickness of the tire body placed in the mold B is larger than the height of a mold cavity of the mold B after the mold B is closed, the inner peripheral surface and the outer peripheral surface of the tire body are completely separated, compressed air is filled after the mold is closed, the outer diameter of the tire body is expanded to a certain extent, a strengthening track is reserved for eliminating bumping or breaking hidden troubles of a joint process, the tire body can be tightly pressed after the mold B on an injection machine is closed, and when B rubber material is injected under strong pressure, the B rubber material enters the inner peripheral surface of the tire body of the inner tire layer, and the integral structure of a finished tire is.
According to a further technical scheme, an injection port is formed in the outer peripheral surface of the mold B, so that a composite tire layer is formed in a reinforced track area reserved on the outer peripheral surface of an inner tire layer; and the inner peripheral surface of the mold B is provided with a vent hole, so that the bladder cavity is filled with compressed air in the cross-linking vulcanization process, the deformation of the bladder cavity channel caused by the pressure generated by mold pressing is prevented, and the better vulcanization of the rubber material in the bladder cavity channel is promoted.
According to the further technical scheme, in the third step, the elastic framework material is wound in the threaded concave-convex groove of the partially crosslinked and vulcanized tire body, so that the binding force between the two system materials of the inner tire layer and the composite tire layer is enhanced, the inner tire layer and the composite tire layer are favorably supported by the framework material as a bridge, and the inner tire layer and the composite tire layer are further integrated into a whole; the support force and the comfort of the tire are enhanced, the overall weight of the tire is reduced, the cost of raw materials is reduced, and the like; the framework material needs preprocessing treatment such as gum dipping before winding, but is not limited to gum dipping, so that the framework material is prevented from forming a structure similar to a prick between an inner tire layer and a composite tire layer, stress is generated, and the stability of the inner portion of a tire body is influenced.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the invention relates to an extrusion and injection composite molding inflation-free tire and a processing method thereof.A composite tire layer is sleeved on the outer layer of an inner tire layer in a matching manner, a thread-shaped concave-convex groove formed between the outer peripheral surface of the inner tire layer and the composite tire layer is a thread-shaped concave-convex groove I connected in an arc shape, the intersection of the inner tire layer and the outer tire layer is mutually embedded by the thread-shaped concave-convex groove I and is fused into a whole by vulcanization crosslinking, so that the safety problems of shaking, jolting, even fracture and the like in riding caused by non-uniformity of the tire joint are solved;
(2) according to the extrusion and injection composite molding inflation-free tire and the processing method thereof, the threaded concave-convex groove formed between the outer peripheral surface of the inner tire tube layer and the composite tire layer is a V-shaped connected threaded concave-convex groove II, so that the contact area of the joint of the inner tire layer and the outer tire layer is increased, the joint is tighter, the effective adhesion of the inner tire layer and the composite tire layer is ensured, and the uniformity problem of the joint of the tire is effectively solved;
(3) according to the extrusion and injection composite molding inflation-free tire and the processing method thereof, the inner tire layer is made of the extrusion rubber material A with the load being emphasized, and has the framework material performance, so that the structural strength of the tire is improved; the composite tire layer is made of an injection rubber material B with emphasis on comfort, so that the tire is good in wear resistance, flex resistance, wet skid resistance and buffering performance, after the rubber material B is extruded out of the outer layer of the composite injection rubber material B, the riding comfort and the load capacity of the tire are considered on the premise of safety, and the problem of non-uniformity of tire joints in the traditional tire production process can be solved to a certain extent;
(4) according to the extrusion and injection composite molding inflation-free tire and the processing method thereof, the inner wall of the mold forming cavity A is provided with the thread type concave-convex structure, so that the corresponding thread type concave-convex groove is formed on the outer peripheral surface of the inner tire tube layer molded by the mold forming cavity A, the inner peripheral surface of the composite tire layer formed after the rubber material B is injected is matched with the thread type concave-convex groove on the outer peripheral surface of the inner tire tube layer, and the inner tire layer is used as a structural member of a support frame to bear tire load, buffer action and the like; the composite tire layer formed by the injected rubber compound B is used as a tire tread to play roles of wear resistance, skid resistance and the like, so that the two advantages of an extrusion process and an injection process are integrated;
(5) the invention relates to an extrusion and injection composite molding inflation-free tire and a processing method thereof.A tire body put into a B mold is thicker than the height of a mold cavity of the B mold after the B mold is closed, the inner and outer peripheral surfaces of the tire body are completely separated, compressed air is filled after the mold is closed, so that the outer diameter of the tire body is expanded to a certain extent, a strengthening track is reserved for eliminating the bumping or breaking hidden trouble of a joint process, the tire body can be tightly pressed after the B mold on an injection machine is closed, and the B rubber material is prevented from entering the inner peripheral surface of the tire body of an inner tire layer when the B rubber material is injected under strong pressure, so that the integral structure of a;
(6) according to the extrusion and injection composite molding inflation-free tire and the processing method thereof, the elastic framework material is wound in the thread-shaped concave-convex groove of the partially crosslinked and vulcanized tire body so as to enhance the bonding force between the two system materials of the inner tire layer and the composite tire layer, and the two system materials are further fused into a whole by taking the framework material as a bridge; the support force and the comfort of the tire are enhanced, the overall weight of the tire is reduced, the cost of raw materials is reduced, and the like; preprocessing treatment (not limited to gum dipping) such as gum dipping is needed to be carried out on the framework material before winding, so that the framework material is prevented from forming a structure similar to a prick between the inner tire layer and the composite tire layer, stress is generated, and the internal stability of the tire body is prevented from being influenced;
(7) according to the extrusion and injection composite molding inflation-free tire and the processing method thereof, the extrusion rubber material A is mainly loaded, the extrusion rubber material A comprises 25-35% of natural rubber, 8-10% of high styrene masterbatch, 15-20% of regenerated rubber and the like, wherein the natural rubber, the high styrene masterbatch and the regenerated rubber are blended, so that the stiffness is good, the support performance of a framework of the tire is improved, and the support and bearing effects of the tire are highlighted; the injection rubber material B is mainly used for comfort, the injection rubber material B comprises 45-65% of rubber (natural rubber, styrene butadiene rubber, butadiene rubber) and the like, wherein the natural rubber is good in elasticity, the styrene butadiene rubber is good in wet skid resistance, the butadiene rubber is good in wear resistance, and the injection rubber material B is blended with other compounding agents and the like to highlight the better elasticity, wet skid resistance and wear resistance of the tire. Compared with the traditional tire, the tire provided by the invention is divided into the inner tire layer and the outer tire layer, so that the proportion of the high-performance rubber added by the injection rubber material B used for the outer layer is only increased, and the cost is saved.
Drawings
FIG. 1 is a schematic perspective view of a conventional non-pneumatic tire;
FIG. 2 is a schematic longitudinal sectional view of the non-pneumatic tire of the present invention;
FIG. 3 is an enlarged view of part A of FIG. 2;
FIG. 4 is a schematic perspective view of the mold A according to the present invention;
FIG. 5 is a schematic perspective view of the mold B of the present invention;
FIG. 6 is a schematic longitudinal sectional view of the non-pneumatic tire of the present invention;
fig. 7 is an enlarged structural diagram of part B in fig. 6.
In the figure: 1-a carcass; 2-the capsular cavity; 3-A, a mould; 4-B mold; 11-an inner tyre layer; 12-a composite ply; 13-inner circumferential surface of carcass; 31-thread type concave-convex structure; 32-vent I; 41-injection port; 42-vent II; 111-thread type tongue and groove I; 112-thread type concave-convex groove II.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
Example 1
The extrusion and injection composite molding non-pneumatic tire of the embodiment, as shown in fig. 2, comprises a tire body, wherein the tire body 1 comprises an inner tire layer 11, and a bladder cavity 2 is formed in the middle of the inner tire layer 11 along the circumferential direction thereof; the outer peripheral surface of the inner tire layer 11 is provided with a thread-shaped concave-convex groove, the outer layer of the inner tire layer is coaxially and adaptively sleeved with the composite tire layer 12, and the composite tire layer is integrated by vulcanization and crosslinking, so that the safety problems of shaking, jolting, even fracture and the like in riding caused by non-uniformity of a tire joint are solved. As shown in fig. 1, compared with the existing non-pneumatic tire, the non-pneumatic tire of the present invention can solve the problem of jolt caused by insufficient resilience during the riding process of the non-pneumatic tire to a great extent.
In the embodiment, as shown in fig. 2 to 3, the thread-shaped concave-convex groove formed between the outer circumferential surface of the inner tire layer 11 and the composite tire layer 12 is a thread-shaped concave-convex groove I111 connected in an arc shape, and the intersection of the inner tire layer and the outer tire layer is mutually embedded by the thread-shaped concave-convex groove I111, so as to solve the safety problems of shaking, jolting, even fracture and the like in riding caused by non-uniformity at the tire joint; the inner tire layer 11 is made of an extruded rubber material A, the extruded rubber material A is mainly loaded, the extruded rubber material A comprises 25-35% of natural rubber, 8-10% of high styrene master batch, 15-20% of regenerated rubber and the like, and the natural rubber, the high styrene master batch, the regenerated rubber and the like are blended to achieve good stiffness, so that the support performance of a framework of the tire is improved, and the support and bearing effects of the tire are highlighted; the composite tire layer 12 is made of an injection rubber material B, the injection rubber material B is mainly used for comfort, the injection rubber material B comprises 45-65% of rubber (natural rubber, styrene butadiene rubber, butadiene rubber) and the like, the natural rubber is good in elasticity, the styrene butadiene rubber is good in wet skid resistance, the butadiene rubber is good in wear resistance, and the better elasticity, wet skid resistance and wear resistance of the tire are highlighted by blending with other compounding agents and the like. Compared with the traditional tire, the tire provided by the invention is divided into the inner tire layer and the outer tire layer, so that the proportion of the high-performance rubber added by the injection rubber material B used for the outer layer is only increased, and the cost is saved. After the rubber material A is extruded and the rubber material B is injected outside the rubber material A in a compounding way, the functions of load, comfort and the like have clear division of labor on the premise of higher safety, and the problem of non-uniformity of the tire joints in the traditional tire production process can be solved to a certain extent; the junction of the two types of sizing materials is mutually embedded (inosculated and welded) by means of a threaded concave-convex groove I111 (single strand or multiple strands, parallel or alternative), and then is vulcanized and crosslinked by utilizing chemical bonds of high polymer materials to be integrated.
Example 2
The basic structure of the extrusion and injection composite molding non-pneumatic tire of the embodiment is the same as that of the embodiment 1, and the difference and the improvement are that: as shown in fig. 6-7, the thread-shaped concave-convex groove formed between the outer peripheral surface of the inner tire layer 11 and the composite tire layer 12 is a V-shaped connected thread-shaped concave-convex groove II112, so that the contact area of the joint of the inner tire layer and the outer tire layer is increased, the joint is more compact, the effective adhesion of the inner tire layer 11 and the composite tire layer 12 is ensured, and the problem of uniformity of the joint of the tire is effectively solved.
Example 3
The basic structure of the processing method of the extrusion and injection composite molding non-pneumatic tire of the embodiment is the same as that of the embodiment 2, and the differences and the improvements are that: the method comprises the following steps:
step one, extruding a tubular inner tire layer 11: adding a sizing material A into a screw extruder, and further extruding a tubular inner tire layer 11;
step two, opening the die A by the die 3: cutting the extruded tubular inner tire layer 11 according to the size of the tire, butt-jointing the extruded tubular inner tire layer end to end for molding, and then placing the molded tubular inner tire layer in a mold A3 on a flat vulcanizing machine for mold closing;
step three, partial crosslinking and vulcanization: an inflation pipe is inserted inwards along the direction vertical to the inner circumferential surface 13 of the tire body, compressed air is introduced into the bag cavity 2 of the inner tire layer 11, the input compressed air is about 1.0MPa, so that the whole bag cavity 2 is filled with the compressed air, then the upper die and the lower die of the die A are molded, partial cross-linking vulcanization is completed, and therefore joint stress is weakened, and comprehensive performance is enhanced;
step four, opening the die of the die B4: taking out the carcass 1 which is subjected to partial cross-linking vulcanization from the mold A3, then placing the carcass into a mold B4 on an injection machine, placing the carcass depending on the inner cavity of the mold, and combining the molds;
step five, injecting a sizing material B: injecting the rubber material B into the mold B4 by an injection machine until the mold is filled with the rubber material B, and forming a composite tire layer 12 on the periphery of the inner tire layer 11, so that the outer part of the tire body 1 is wear-resistant and skid-resistant;
step six, vulcanization molding: an inflation pipe is inserted inwards along the direction vertical to the inner peripheral surface 13 of the tire body, compressed air is introduced into the bag cavity 2 of the compounded tire body 1, the input compressed air is about 1.0MPa, so that the whole bag cavity 2 is filled with the compressed air, vulcanization molding is carried out, and the injected rubber material and the inner tire layer 11 are vulcanized, cross-linked and combined to form a unified whole, so that the hidden trouble of joints, namely over-tight connection, a convex state at the joints, sudden change of the internal structure shape, easy bumping and poor riding comfort are solved; connect the relaxation, the sunken state appears in joint department, easily takes place to jolt, can break off even, and the travelling comfort is poor and there is the potential safety hazard great.
In the second embodiment, as shown in fig. 4, in the step a, a vent hole I32 is formed in the inner circumferential surface of the mold a 3, an inflation tube is inserted in a direction perpendicular to the inner circumferential surface of the carcass, and compressed air is introduced into the bladder cavity 2 of the inner carcass layer 11, so that it is ensured that the bladder cavity 2 is filled with compressed air in the subsequent crosslinking vulcanization process, deformation in the channel of the bladder cavity 2 due to pressure generated by mold pressing is prevented, and better vulcanization of the rubber in the channel of the bladder cavity 2 is promoted; the inner wall of the forming cavity of the mold A3 is provided with a threaded concave-convex structure 31, so that a corresponding threaded concave-convex groove I111 is formed on the outer peripheral surface of the inner tire layer 11 molded by the mold A, and the inner peripheral surface of the composite tire layer 12 formed after the rubber material B is injected is matched with the threaded concave-convex groove I111 on the outer peripheral surface of the inner tire layer 11, so that the inner tire layer 11 serves as a support frame structural member to bear tire load, buffer action and the like; the composite tire layer 12 formed by the injected rubber compound B is used as a tire tread to play roles of wear resistance, skid resistance and the like, so that the two advantages of an extrusion process and an injection process are integrated.
In the fourth step, as shown in fig. 5, an injection port 41 is opened on the outer circumferential surface of the B mold 4, so that a composite tire layer 12 is formed in a reinforcement track area reserved on the outer circumferential surface of the inner tire layer 11; the inner peripheral surface of the B die 4 is provided with a vent hole II42, so that the capsule cavity 2 is filled with compressed air in the cross-linking vulcanization process, the deformation in the channel of the capsule cavity 2 caused by the pressure generated by die pressing is prevented, and the better vulcanization of the rubber material in the channel of the capsule cavity 2 is promoted; the thickness of the tire body 1 placed in the B mold 4 is larger than the height of a mold cavity of the B mold 4 after mold closing, the inner peripheral surface and the outer peripheral surface of the tire body 1 are completely separated, compressed air is filled after mold closing, the outer diameter of the tire body 1 is expanded to a certain degree, a strengthening track is reserved for eliminating jolt or fracture hidden danger of a joint process, the tire body 1 can be tightly pressed after the B mold 4 on an injection machine is closed, and when B rubber materials are injected under strong pressure, the B rubber materials enter the inner peripheral surface 13 of the tire body of the inner tire layer 11, and the integral structure of a finished tire is further influenced.
The inflation-free hollow tire prepared by the production process of pure extrusion and mould pressing (plate vulcanization) is applied to tires of electric vehicles, bicycles and the like, and the comfort in the riding process is far away compared with that of the traditional pneumatic tire due to the problems of low rebound and buffering performance, relatively heavy tire and the like of the tire, and the power consumption is high, labor is wasted and strong jolt is easy to occur in the riding process; the performance of both the riding comfort and the load capacity of the tire cannot be considered. The invention combines the traditional production process of inflation-free tire (extrusion and flat vulcanization) and the injection process, integrates the two advantages of the extrusion process and the injection process, creatively develops a composite technology, and is safer and more comfortable. Wherein, traditional tire production technology (extrude + dull and stereotyped vulcanization molding process), the advantage: the process is simple, the equipment cost is low, and the batch production is easy to realize; the disadvantages are as follows: because of the tubulose child embryo of extruding need decide and dock and then vulcanize the shaping according to the tire size, the inhomogeneous problem easily appears in tire joint department, and then makes the tire shake, jolt in riding, appear the fracture even, seriously influences the travelling comfort of tire riding, even causes the traffic accident. Modern tire production technology (injection molding technology) has the advantages that: the automation degree is high, the labor intensity is low, the operation steps are simplified, and the uniformity of the whole tire is better; the problem of uneven tire joints in the traditional tire production process can be solved to a certain extent. The joint part of the extrusion process has the joint hidden danger (the joint is too tight, the joint is in a convex state, the internal structure is suddenly changed in shape, the joint is easy to jolt and the riding comfort is poor) caused by the compound technology of the injection process, and the joint is loose, the joint is in a concave state, the joint is easy to jolt and even can break, the riding comfort is poor and the hidden danger is high) is eliminated and optimized as much as possible (the molded thread is reserved with a spiral injection track, the welding reinforcement is realized, and the high molecular chemical bond is utilized for vulcanization and crosslinking to be integrated into a whole).
Example 4
The basic structure of the processing method of the extrusion and injection composite molding non-pneumatic tire of the embodiment is the same as that of the embodiment 3, and the differences and the improvements are that: the method comprises the following steps:
step one, extruding a tubular inner tire layer 11: adding a sizing material A into a screw extruder, and further extruding a tubular inner tire layer 11;
step two, opening the die A by the die 3: cutting the extruded tubular inner tire layer 11 according to the size of the tire, butt-jointing the extruded tubular inner tire layer end to end for molding, and then placing the molded tubular inner tire layer in a mold A3 on a flat vulcanizing machine for mold closing;
step three, partial crosslinking and vulcanization: introducing compressed air into a bladder cavity through hole 14 of the inner tire layer 11, wherein the input compressed air is about 1.0MPa, so that the whole bladder cavity 2 is filled with the compressed air, and then, an upper die and a lower die of a die A are molded to complete partial cross-linking vulcanization, thereby weakening the stress of a joint and strengthening the comprehensive performance;
step four, opening the die of the die B4: taking out the carcass 1 which is subjected to partial cross-linking vulcanization from the mold A3, then placing the carcass into a mold B4 on an injection machine, placing the carcass depending on the inner cavity of the mold, and combining the molds;
step five, injecting a sizing material B: injecting the rubber material B into the mold B4 by an injection machine until the mold is filled with the rubber material B, and forming a composite tire layer 12 on the periphery of the inner tire layer 11, so that the outer part of the tire body 1 is wear-resistant and skid-resistant;
step six, vulcanization molding: and introducing compressed air into the bladder cavity through hole 14 of the compounded tire body 1, wherein the input compressed air is about 1.0 MPa.
In the first step, in this embodiment, the outer diameter of the extruded inner tube layer 11 is smaller than the outer diameter of the finished tire (about 70%), so as to reserve a coating space for eliminating the bumping or breaking hidden trouble of the joint process in the subsequent process; in the fifth step, the outer diameter of the pipe of the tire body 1 of the composite tire layer 12 formed by injection before mold pressing and vulcanization is smaller than the outer diameter (about 80%) of the finished tire, and because the outer diameter of the pipe is expanded to a certain extent by charging compressed air in the sixth step, a strengthening track is reserved in order to eliminate the bumping or fracture hidden trouble of the joint process, so that the subsequent processes can be smoothly carried out.
As shown in fig. 4, a vent hole I32 is formed in the inner circumferential surface of the a mold 3 corresponding to the bladder cavity through hole 14, and compressed air is introduced into the bladder cavity through hole 14 of the inner tire layer 11, so that the bladder cavity 2 is filled with compressed air in the subsequent crosslinking vulcanization process, the deformation of the bladder cavity 2 in the channel caused by the pressure generated by mold pressing is prevented, and the better vulcanization of the rubber in the bladder cavity 2 channel is promoted; the inner wall of the forming cavity of the mold A3 is provided with a threaded concave-convex structure 31, so that a corresponding threaded concave-convex groove II112 is formed on the outer peripheral surface of the inner tire layer 11 molded by the mold A, and the inner peripheral surface of the composite tire layer 12 formed after the rubber material B is injected is matched with the threaded concave-convex groove II112 on the outer peripheral surface of the inner tire layer 11, so that the inner tire layer 11 serves as a support frame structural member to bear tire load, buffer action and the like; the composite tire layer 12 formed by the injected rubber compound B is used as a tire tread to play roles of wear resistance, skid resistance and the like, so that the two advantages of an extrusion process and an injection process are integrated.
As shown in fig. 6-7, the shape of the thread-shaped concave-convex groove II112 is a V-shaped connected structure to increase the contact area of the joint of the inner tube layer 11 and the composite tire layer 12, so that the combination of the inner tube layer and the outer tube layer is more compact, the effective adhesion of the inner tube layer and the composite tire layer is ensured, and the uniformity problem of the joint of the tire is effectively solved.
Example 5
The basic structure of the processing method of the extrusion and injection composite molding non-pneumatic tire of the embodiment is the same as that of the embodiment 4, and the differences and the improvements are that: the method comprises the following steps:
step one, extruding a tubular inner tire layer 11: adding a sizing material A into a screw extruder, and further extruding a tubular inner tire layer 11;
step two, opening the die A by the die 3: cutting the extruded tubular inner tire layer 11 according to the size of the tire, butt-jointing the extruded tubular inner tire layer end to end for molding, and then placing the molded tubular inner tire layer in a mold A3 on a flat vulcanizing machine for mold closing;
step three, partial crosslinking and vulcanization: introducing compressed air into a bladder cavity through hole 14 of the inner tire layer 11, wherein the input compressed air is about 1.0MPa, so that the whole bladder cavity 2 is filled with the compressed air, and then, an upper die and a lower die of a die A are molded to complete partial cross-linking vulcanization, thereby weakening the stress of a joint and strengthening the comprehensive performance;
step four, winding the elastic framework material: winding an elastic framework material in a threaded concave-convex groove of the tire body 1, and performing gum dipping preprocessing on the elastic framework material in advance;
step five, opening the die of the die B4: placing the partially crosslinked and vulcanized tire body 1 into a B mold 4 on an injection machine, placing the tire body by depending on the inner cavity of the mold, and combining the mold;
step six, injecting a sizing material B: injecting the rubber material B into the mold B4 by an injection machine until the mold is filled with the rubber material B, and forming a composite tire layer 12 on the periphery of the inner tire layer 11, so that the outer part of the tire body 1 is wear-resistant and skid-resistant;
step seven, vulcanization molding: and introducing compressed air into the bladder cavity through hole 14 of the compounded tire body 1, wherein the input compressed air is about 1.0 MPa.
In the embodiment, the elastic framework material is wound in the threaded concave-convex groove to enhance the bonding force between the two system materials of the inner tire layer 11 and the composite tire layer 12, so that the inner tire layer and the composite tire layer are favorable for being supported by the framework material as a bridge and further integrated into a whole, the composite tire layer 12 is effectively prevented from being separated from the inner tire layer 11, and the safety problems of shaking, jolting, even fracture and the like in riding caused by non-uniformity at the tire joint are solved; the support force and the comfort of the tire are enhanced, the overall weight of the tire is reduced, the cost of raw materials is reduced, and the like; the framework material needs preprocessing treatment (not limited to gumming) such as gumming before winding, and the phenomenon that the framework material forms a structure similar to a prick between the inner tire layer 11 and the composite tire layer 12, stress is generated, and the stability of the inner portion of a tire body is affected is avoided.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (10)
1. An extrusion and injection composite molding non-pneumatic tire comprises a tire body (1), and is characterized in that: the tyre body (1) comprises an inner tyre layer (11), and the middle part of the inner tyre layer (11) is provided with a capsule cavity (2) along the circumferential direction; the outer peripheral surface of the inner tire layer (11) is provided with a thread-shaped concave-convex groove, and the outer layer is coaxially and adaptively sleeved with the composite tire layer (12).
2. A composite extrusion and injection molded non-pneumatic tire as in claim 1, wherein: and the thread-shaped concave-convex groove formed between the outer peripheral surface of the inner tire layer (11) and the composite tire layer (12) is a thread-shaped concave-convex groove I (111) connected in a circular arc shape.
3. A composite extrusion and injection molded non-pneumatic tire as in claim 1, wherein: and the thread-shaped concave-convex groove formed between the outer peripheral surface of the inner tire layer (11) and the composite tire layer (12) is a V-shaped connected thread-shaped concave-convex groove II (112).
4. An extrusion and injection composite molded non-pneumatic tire as claimed in claim 2 or 3, wherein: the inner tire layer (11) is made of an extruded rubber material A, and the composite tire layer (12) is made of an injected rubber material B.
5. A processing method for extruding and injecting a composite molding non-pneumatic tire is characterized by comprising the following steps:
step one, extruding a tubular inner tire layer (11): adding a sizing material A into a screw extruder, and further extruding a tubular inner tire layer (11);
step two, opening the die A (3): cutting the extruded tubular inner tire layer (11) according to the size of the tire, butt-jointing and molding the tubular inner tire layer end to end, and then placing the tubular inner tire layer in a mold A (3) on a flat vulcanizing machine for mold closing;
step three, partial crosslinking and vulcanization: inserting an inflation pipe along the direction vertical to the inner circumferential surface (13) of the tire body, introducing compressed air into the bladder cavity (2) of the inner tire layer (11) to enable the compressed air to fill the whole bladder cavity (2), and then molding an upper mold and a lower mold of the mold A (3) to finish partial cross-linking vulcanization;
step four, opening the die B (4): taking out the partially crosslinked and vulcanized tire body (1) from the mold A (3), then placing the tire body into a mold B (4) on an injection machine, placing the tire body by depending on the inner cavity of the mold, and combining the molds;
step five, injecting a sizing material B: injecting the rubber material B into the mold B (4) through an injection machine until the mold is filled with the rubber material B, and forming a composite tire layer (12) on the periphery of the inner tire layer (11);
step six, vulcanization molding: and introducing compressed air into the bladder cavity (2) of the compounded tire body (1) to ensure that the whole bladder cavity (2) is filled with the compressed air, and carrying out vulcanization molding.
6. The method for manufacturing an extrusion and injection composite molding non-pneumatic tire as claimed in claim 5, wherein: in the second step, a vent I (32) is arranged on the inner circumferential surface of the A die (3); the inner wall of the forming cavity of the mold A (3) is provided with a thread concave-convex structure (31), so that corresponding thread concave-convex grooves are formed on the outer peripheral surface of the inner tire layer (11) molded by the mold A.
7. The method for manufacturing an extrusion and injection composite molding non-pneumatic tire as claimed in claim 6, wherein: the inner peripheral surface of the composite tire layer (12) formed after the rubber compound B is injected is matched with the thread-shaped concave-convex groove on the outer peripheral surface of the inner tire layer (11).
8. The method for manufacturing an extrusion and injection composite molding non-pneumatic tire as claimed in claim 5, wherein: in the fourth step, the thickness of the tire body (1) placed in the B die (4) is larger than the height of the die cavity of the B die (4) after die assembly, and the inner and outer circumferential surfaces of the tire body (1) are completely separated.
9. A method for manufacturing an extrusion and injection composite molding non-pneumatic tire as claimed in claim 8, wherein: the outer peripheral surface of the B die (4) is provided with an injection port (41), and the inner peripheral surface is provided with a vent hole II (42).
10. The method for manufacturing an extrusion and injection composite molding non-pneumatic tire as claimed in claim 5, wherein: and in the third step, winding an elastic framework material in a threaded concave-convex groove of the partially crosslinked and vulcanized tire body (1), wherein the framework material needs to be subjected to preprocessing treatment before winding, and the preprocessing treatment comprises but is not limited to gum dipping.
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|---|---|---|---|
| CN202010815228.1A CN111823487A (en) | 2020-08-14 | 2020-08-14 | Extrusion and injection composite molding inflation-free tire and processing method thereof |
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| CN202010815228.1A CN111823487A (en) | 2020-08-14 | 2020-08-14 | Extrusion and injection composite molding inflation-free tire and processing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112440622A (en) * | 2020-12-15 | 2021-03-05 | 郁萍 | Tire with inner cavity in shape of Leluo triangle and processing method thereof |
| CN112549862A (en) * | 2020-11-20 | 2021-03-26 | 广东顺路驰科技有限公司 | Non-pneumatic tire and method for manufacturing the same |
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2020
- 2020-08-14 CN CN202010815228.1A patent/CN111823487A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112549862A (en) * | 2020-11-20 | 2021-03-26 | 广东顺路驰科技有限公司 | Non-pneumatic tire and method for manufacturing the same |
| CN112440622A (en) * | 2020-12-15 | 2021-03-05 | 郁萍 | Tire with inner cavity in shape of Leluo triangle and processing method thereof |
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