CN109228165B - Electromagnetic vulcanization tread segmented mold - Google Patents
Electromagnetic vulcanization tread segmented mold Download PDFInfo
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- CN109228165B CN109228165B CN201811257643.9A CN201811257643A CN109228165B CN 109228165 B CN109228165 B CN 109228165B CN 201811257643 A CN201811257643 A CN 201811257643A CN 109228165 B CN109228165 B CN 109228165B
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- 238000004073 vulcanization Methods 0.000 title claims abstract description 19
- 238000002347 injection Methods 0.000 claims abstract description 49
- 239000007924 injection Substances 0.000 claims abstract description 49
- 229920001971 elastomer Polymers 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229910001296 Malleable iron Inorganic materials 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000002076 thermal analysis method Methods 0.000 claims description 3
- 238000010092 rubber production Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 22
- 150000001875 compounds Chemical class 0.000 description 13
- 238000000034 method Methods 0.000 description 10
- 239000002131 composite material Substances 0.000 description 8
- 239000000835 fiber Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 229920001187 thermosetting polymer Polymers 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010070 extrusion (rubber) Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 238000011056 performance test Methods 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
- 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2602—Mould construction elements
-
- 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention belongs to the technical field of molds for rubber production, and relates to an electromagnetic vulcanization tread segmented mold, which comprises a main body structure, wherein the main body structure comprises an upper cover, an arch-shaped seat component, a pattern block component, an inner mold core, a runner component, a flange piece and a sealing ring, and is matched with four gear pump rubber injection machines for use.
Description
Technical field:
the invention belongs to the technical field of molds for rubber production, and relates to an electromagnetic vulcanization tread segmented mold which is matched with four gear pump rubber injection machines for use, and the injection efficiency is improved by adopting a symmetrical injection method.
The background technology is as follows:
in the injection molding process of rubber products, the rubber is subjected to severe friction with parts such as the inner wall of a pouring gate, the inner wall of a runner, the inner cavity of a mold and the like when being extruded from the head of the injection machine. As the injection process proceeds, the front end undergoes reaction curing due to the increasing temperature and the obstruction of the complex runner cavity, resulting in runner blockage, uneven mold filling, weld marks or gaps in the product, and the flow characteristics of the material are affected by viscosity, shear and cure rate. Unlike thermoplastic resins, many thermoset elastomeric materials are not used for injection molding; typically these compounds do not react well when subjected to shear, which refers to the strain imparted to the composite material from pressure as the feed screw plasticizes and the material passes through the injector head, gate or runner during injection. In many materials used for injection molding, additional shear reduces the viscosity of the material, improving the flow characteristics of the material, making difficult to fill part geometries easier to fill. The heat generated by shearing the material during injection can also significantly reduce the required cure time compared to other thermoset elastomeric material forming processes, if the viscosity change is inconsistent or repeatable, resulting in inconsistent injection volumes and filled parts, resulting in flash or underfilling. If the injection molding material is not formulated, shearing effects during injection can cause interlayer separation, foaming, or premature curing of the material. In this case, it is necessary to reform the material or to select another molding process. Temperature issues must also be considered in developing rubber mold injection parts. First, the molding temperature, or the molding temperature of the cavity, determines the curing time and the filling time of the component, maintaining a consistent molding temperature to ensure consistent curing and filling conditions. When relatively cold material is injected into the cavity, the time required for heat loss and recovery of the cavity steel must be known, and the main factors affecting heat loss and heat gain include part geometry, tool steel use, cold and hot runner molds, and demolding time. Then the material temperature, the molded thermoset elastomer material must maintain the flow of cooling medium to the injection device and the handpiece so that the cooling temperature is below the solidification temperature of the material, the temperature rise can reduce the torque required during plasticizing, and temperature fluctuations can also cause inconsistent metering performance, resulting in inconsistent actual metering values. Increasing the temperature of the material during injection can have a variety of effects, including: the viscosity of the material is reduced, the injection pressure is reduced, the heat loss in the cavity in the injection process is reduced, and the curing time is shortened. Increasing the temperature also shortens the part fill time by increasing the cure rate of the material so that the composite begins to cure before the molding is completely full. The medium used to cool the injection device includes water, a water/glycol mixture and a heat transfer oil for higher temperatures, selected according to the desired process temperature. For tires, which are large products, a reasonable design of the mold structure is required to reduce the cost of mold testing.
The lower open type vacuumizing segmented mold disclosed in China patent 201621461043.0 comprises a base, a guide ring and an upper cover, wherein the end part of the outer circle of the upper cover is provided with a bulge, the top of the outer circle surface of the guide ring is matched with the inner wall of the bulge, a sealing groove is formed in the matching surface of the bulge and the guide ring, a first sealing ring is arranged in the sealing groove, the sealing groove can be arranged on the top of the outer circle surface of the guide ring and also can be arranged on the inner wall surface of the bulge, and in the tire vulcanization process, gas in a cavity between a tire blank and a pattern block, an upper side plate, a lower side plate, an upper steel ring and a lower steel ring is pumped out, so that rubber is easier to fill each dead angle in a mold cavity; the movable die structure of the embedded antifriction plate disclosed in China patent 201720458999.3 comprises an intermediate die sleeve antifriction plate and a base antifriction plate, wherein the intermediate die sleeve antifriction plate and the base antifriction plate are respectively and fixedly connected to the intermediate die sleeve and the base through an embedded structure, the embedded structure of the intermediate die sleeve antifriction plate comprises a pair of T-shaped grooves arranged above and below the intermediate die sleeve and a pair of embedded T-shaped edges which are arranged above and below the intermediate die sleeve antifriction plate and correspond to the T-shaped grooves, the other two edges of the intermediate die sleeve antifriction plate are designed into tapered side edges, and each side edge is provided with pressing nails with the same taper through two heads to fix the intermediate die sleeve antifriction plate on the intermediate die sleeve in a pressing manner; the self-lubricating tire segmented mold disclosed in China patent 201621403114.1 comprises a base, an arch-shaped seat and an upper cover, wherein the base is positioned on the periphery, a middle sleeve which slides back and forth along the surface of the arch-shaped seat is arranged on the outer side surface of the arch-shaped seat, an antifriction plate is arranged on one surface, close to the arch-shaped seat, of the middle sleeve, a lubricating material for lubricating the matching surface of the arch-shaped seat is arranged on the antifriction plate, a T-shaped block for sliding with the upper cover is arranged on the arch-shaped seat, an upper cover opening antifriction plate and an upper cover closing antifriction plate for matching with the T-shaped block are arranged on the upper cover, a antifriction plate for forming a sliding surface with the arch-shaped seat is arranged on the base, and a lubricating material for lubricating the matching surface of the arch-shaped seat is also arranged on the antifriction plate; the conical surface guiding radial tire segmented mold disclosed in China patent 201720090507.X comprises a base, wherein the upper surface of the base is provided with a sliding rail, the inside of the sliding rail is clamped with a sliding block, the middle part of the upper surface of the sliding block is fixedly connected with an arched seat through a connecting rod, the upper surface of a middle die sleeve is provided with a round hole, the upper surface of the base is provided with a guiding column, the inside of the round hole is in sliding sleeve connection with the guiding column, the upper end of the guiding column is fixedly connected with an anti-falling plate, the side surface of the lower side plate is provided with a clamping groove, the lower end of the side surface of the pattern block is fixedly connected with a movable rod, the inside of the clamping groove is in sliding sleeve connection with the movable rod, and one end of the movable rod is provided with a limiting plate; the radial tire segmented mold convenient to disassemble and assemble disclosed in Chinese patent 201621451150.5 comprises a mold lower side plate and an annular I-shaped seat which are respectively arranged on a base, pattern blocks are fixedly connected in the annular I-shaped seat, guide strips are arranged on the outer side surface of the I-shaped seat in an equidistant radian manner, a middle mold sleeve inner ring is movably arranged on the outer side of the annular I-shaped seat, guide grooves on the inner side surface of the middle mold sleeve inner ring are in movable fit with the guide strips arranged on the outer side surface of the I-shaped seat, and through grooves of the guide strips are arranged on the inner side surface of a middle ring corresponding to an outlet at the upper end of the guide grooves in an equidistant radian manner; the inclined plane engineering tire segmented mold disclosed in China patent 201720090541.7 comprises a chassis and a middle mold sleeve, wherein the surface of the chassis is provided with a lower mold plate, the right end of the lower mold plate is connected with the lower end of a pattern block, the upper end of the pattern block is connected with an upper mold plate, the upper mold plate is arranged on the inner surface of an upper cover, the center of the upper surface of the middle mold sleeve is fixedly connected with the upper cover, the right end of the pattern block is provided with an arch seat, the right end surface of the arch seat is connected with the middle mold sleeve in a sliding manner through a sliding block, the left end of the chassis is provided with a positioning ring, the lower end of the arch seat is internally provided with a sliding groove, the inner part of the sliding groove is provided with a T-shaped sliding block in a sliding manner, the left end surface of the T-shaped sliding block is provided with a stainless steel gasket, and the right end surface of the T-shaped sliding block is connected with the inner wall of the sliding groove through a spring; chinese patent; the flat-open type segmented mold for the radial tire of the engineering truck disclosed in China patent 201720402541.6 comprises an upper cover, an upper cover opening slide plate, a hanging ring, an upper chuck, a clamping position, a T-shaped sliding block, a bow-shaped seat, a base, a limiting block, a wear-resisting plate, a main body, an adjusting ring and a lower chuck, wherein the upper cover is provided with the upper cover opening slide plate, the upper cover is provided with the clamping position, the upper cover is connected with the upper chuck, the upper cover is connected with the hanging ring, the T-shaped sliding block is movably connected with the bow-shaped seat, the base is connected with the main body, the main body is connected with the limiting block, the main body is connected with the adjusting ring, the wear-resisting plate is arranged in the main body, the lower chuck is arranged in the main body, the hanging ring consists of a chain ring, a rotary hanging ring, a steel ball, a screw body, threads and a screw cap, the rotary hanging ring is connected with the screw cap, the screw cap is connected with the screw body, the screw cap is internally provided with the hanging ring; the two-half movable mould for the tire disclosed in Chinese patent 201720877422.6 comprises an upper pattern block and a lower pattern block, wherein the lower pattern block is arranged on a base, a plurality of sliding grooves with the same number as the lower pattern block are arranged on the outer ring of the base, a moving element is arranged in each sliding groove and is fixedly connected with the lower pattern block, the lower pattern block moves along with the moving element, an elastic element is sleeved between one side of the moving element and each sliding groove, the moving element can move under the driving of the elastic element, a limiting element is arranged at the limiting position of the movement of the moving element, and the moving distance of the moving element is limited; the novel vacuum tire segmented mold disclosed in China patent 201721068237.9 comprises a vacuum centripetal mechanism device and a cavity, wherein the vacuum centripetal mechanism device comprises a middle sleeve, a sliding block, a base, an upper cover, an upper ring, a lifting block, a guide bar and a sealing ring, the cavity consists of an upper side plate, a lower side plate and a plurality of pattern blocks capable of radially moving, the upper side plate is fixed below the upper cover, the lower side plate is fixed above the base, the pattern blocks are arranged on the outer side between the upper side plate and the lower side plate, the radial movement of the pattern blocks is completed through the vacuum centripetal mechanism device, the outer side of each pattern block is fixed with the sliding block through a pattern block locking screw, the outer side of the sliding block and the inner side of the middle sleeve are taper, the sliding block is connected with the middle sleeve through the guide bar, the upper and lower displacement of the middle sleeve can drive the sliding block to open and close the mold under the action of the guide bar, the periphery of the base is provided with an annular boss, the annular boss is sleeved with the lower part of the middle sleeve, the annular boss is also provided with a suction hole, the middle sleeve is also provided with a through hole which is matched with the pattern block corresponding to the position, and the air tight through hole is arranged on the outer side of the pattern block; the mold disclosed in the above patent has problems of low efficiency and high pressure during rubber injection. Therefore, the electromagnetic vulcanization tread segmented mold is developed and designed, the injection efficiency is improved, the injection pressure is reduced, and the electromagnetic vulcanization tread segmented mold has higher social value and application prospect.
The invention comprises the following steps:
the invention aims to overcome the defects of the prior art, develops and designs an electromagnetic vulcanization tread segmented mold, and simultaneously is matched with four gear pump rubber injection machines for use, and adopts a symmetrical injection method to improve the injection efficiency and reduce the injection pressure.
In order to achieve the above purpose, the main body structure of the electromagnetic vulcanization tread segmented mold comprises an upper cover, an arch seat component, a pattern block component, an inner mold core, a runner component, a flange piece and a sealing ring; the inner mold core is arranged independently with the upper cover, the bottom of the inner mold core is uniformly provided with four groups of runner components at intervals, the inner mold core is connected with the runner components through flange pieces, and a sealing ring is arranged between the inner mold core and the runner components.
The main body structure of the upper cover comprises a side ring, a T-shaped groove, a top plate and a wedge-shaped block; 8T-shaped grooves are formed in the inner side wall of the side ring at equal intervals, a top plate of a circular ring-shaped structure is arranged at the top of the side ring, and 4 wedge-shaped blocks are arranged in the inner ring of the top plate at equal intervals.
The main body structure of the arch seat comprises a large arch seat, a small arch seat, a T-shaped block, a concave hole and a groove; the 4 large arch-shaped seats and the 4 small arch-shaped seats are enclosed to form an arch-shaped seat according to the principle that the large arch-shaped seats are adjacent to the small arch-shaped seats, T-shaped blocks are arranged at the top centers of the outer side walls of the large arch-shaped seats and the small arch-shaped seats, concave holes are formed in the inner side walls of the large arch-shaped seats and the small arch-shaped seats, and a groove is formed in the bottom center of the small arch-shaped seat.
The main body structure of the pattern block comprises large pattern blocks, small pattern blocks and slotted holes; the 4 large pattern blocks and the 4 small pattern blocks are enclosed to form a pattern block according to the principle that the large pattern blocks are adjacent to the small pattern blocks, the large pattern blocks are clamped in concave holes of the large arch seat and are connected with the large arch seat through bolts, the small pattern blocks are clamped in concave holes of the small arch seat and are connected with the small arch seat through bolts, and a slotted hole is formed in the center of the bottom of the small pattern blocks.
The main body structure of the internal mold core comprises an internal mold core body, a wedge-shaped groove and an opening; the outer side wall of the inner mold core body is provided with 4 wedge-shaped grooves at equal intervals, the bottom of the inner mold core body is provided with 4 circular arc-shaped openings at equal intervals, and the wedge-shaped grooves are communicated with the openings.
The main structure of the runner assembly comprises an upper runner block, a lower runner block, an upper runner port, a lower runner port and a through hole; an upper runner port is formed in the upper runner block, a lower runner port is formed in the lower runner block, the upper runner block is connected with the lower runner block through bolts, and after the upper runner block is connected with the lower runner block, the upper runner port and the lower runner port enclose a through hole in a funnel-shaped structure.
The upper cover and the arched seat are connected in a buckling manner through the T-shaped groove and the T-shaped block; the structural design of the arched seat meets the electromagnetic thermal analysis requirement of Marc, and the small arched seat and the small pattern blocks meet the difference requirement of UG and the flow passage; the pattern block composition and the structure of the inner mold core meet the requirement of UG on the tread extraction surface, and the pattern block composition is divided into 8 blocks according to the division result of the tread extraction surface; the wedge-shaped block is matched with the wedge-shaped groove, and is pulled out when demolding is carried out, and the inner mold core is not completely round, so that the tread is taken out conveniently; the groove and the slot are assembly reserved positions formed by the runners; the upper runner block and the lower runner block are cast by adopting a malleable cast iron sand mould, the matching surfaces of the upper runner block and the lower runner block after casting are subjected to fine grinding, and milling grooves for installing rubber sealing rings are milled at the tops of the through holes.
When the electromagnetic vulcanization tread segmented mold is used, 4 gear pump injection machines are respectively connected with a runner component through flange pieces, an upper cover is sleeved outside an inner mold core to be assembled, a wedge-shaped block of the upper cover is matched with a wedge-shaped groove of the inner mold core to form a complete circle, the gear pump injection machines are started, rubber enters between a pattern block component and the inner mold core through a through hole to be vulcanized to form a tread by adopting a symmetrical injection method of the 4 gear pump injection machines, when the mold is opened, the upper cover is lifted vertically by using an external machine, the pattern block component is separated from the tread by a bow-shaped seat component and is led to move upwards, the wedge-shaped block of the upper cover is separated from the wedge-shaped groove of the inner mold core, a notch appears in the complete circle, the tread is convenient to be demolded, the problem that the tread cannot be demolded due to tight adhesion on the inner mold core is avoided, the tread is manually cut and separated from the tread component is extruded from top to bottom after the tread is demolded, and the rubber in the runner component is assembled from top to bottom, and is assembled, and the next production is carried out.
Compared with the prior art, the design process of the parts is combined with CAE finite element analysis, when the novel tire tread mold is used, 4 gear pump injection machines are respectively connected with a runner component through flange pieces, an upper cover is sleeved outside an inner mold core to be assembled, the gear pump injection machines are started, the method of symmetrical injection of the 4 gear pump injection machines is adopted, rubber enters between a pattern block component and the inner mold core through a through hole to be vulcanized to form a tire tread, when the novel tire tread mold is opened, the upper cover is vertically lifted by using an external machine, a bow-shaped seat component is used for upwards moving with the pattern block component, the pattern block component is separated from the tire tread, a wedge block is separated from a wedge groove, the tire tread and the runner component are manually cut and separated, and the tire tread is assembled, so that next production is performed; the injection device has the advantages of simple structure, high injection efficiency, small injection pressure and environment-friendly use.
Description of the drawings:
fig. 1 is a schematic diagram of the principle of the main structure of the present invention.
Fig. 2 is a schematic diagram of the principle of the main structure of the upper cover according to the present invention.
Fig. 3 is a schematic view of the structural principle of the large arch-shaped seat according to the present invention.
Fig. 4 is a schematic view of the structural principle of the small bow-shaped seat according to the present invention.
Fig. 5 is a schematic structural view of a large block according to the present invention.
Fig. 6 is a schematic structural view of a small block according to the present invention.
Fig. 7 is a schematic diagram of the principle of the main structure of the inner mold core according to the present invention.
Fig. 8 is a schematic diagram of the principle of the main structure of the flow channel assembly according to the present invention.
Fig. 9 is a schematic structural diagram of an upper flow block according to the present invention.
Fig. 10 is a schematic structural diagram of a lower flow channel block according to the present invention.
Fig. 11 is a schematic view of the state of the invention when the mold is opened.
The specific embodiment is as follows:
the invention is further illustrated by the following examples in conjunction with the accompanying drawings.
Example 1:
the main body structure of the electromagnetic vulcanization tread segmented mold comprises an upper cover 1, an arch seat component 2, a pattern block component 3, an inner mold core 4, a runner component 5, a flange piece 6 and a sealing ring 7; the inner part of the upper cover 1 is nested with an arch seat component 2, the upper cover 1 is connected with the arch seat component 2 in a buckling manner, a pattern block component 3 is arranged on the arch seat component 2, the arch seat component 2 is connected with the pattern block component 3 in a bolt manner, the inner mold core 4 is independently arranged with the upper cover 1, four groups of flow passage components 5 are uniformly arranged at intervals at the bottom of the inner mold core 4, the inner mold core 4 is connected with the flow passage components 5 through flange pieces 6, and a sealing ring 7 is arranged between the inner mold core 4 and the flow passage components 5.
The main body structure of the upper cover 1 related to the embodiment comprises a side ring 10, a T-shaped groove 11, a top plate 12 and a wedge-shaped block 13; 8T-shaped grooves 11 are formed in the inner side wall of the side ring 10 at equal intervals, a top plate 12 of a circular ring-shaped structure is arranged at the top of the side ring 10, and 4 wedge-shaped blocks 13 are arranged in the inner ring of the top plate 12 at equal intervals.
The main structure of the arched seat assembly 2 related to the embodiment comprises a large arched seat 20, a small arched seat 21, a T-shaped block 22, a concave hole 23 and a groove 24; the 4 large arch-shaped seats 20 and the 4 small arch-shaped seats 21 are enclosed to form an arch-shaped seat assembly 2 according to the principle that the large arch-shaped seats 20 and the small arch-shaped seats 21 are adjacent, T-shaped blocks 22 are arranged at the top centers of the outer side walls of the large arch-shaped seats 20 and the small arch-shaped seats 21, concave holes 23 are arranged on the inner side walls of the large arch-shaped seats 20 and the small arch-shaped seats 21, and a groove 24 is formed in the bottom center of the small arch-shaped seats 21.
The main body structure of the block assembly 3 according to the present embodiment includes a large block 30, a small block 31, and a groove hole 32; the 4 large pattern blocks 30 and the 4 small pattern blocks 31 are enclosed to form a pattern block assembly 3 according to the principle that the large pattern blocks 30 are adjacent to the small pattern blocks 31, the large pattern blocks 30 are clamped in concave holes 23 of the large arch-shaped seat 20 and are connected with the large arch-shaped seat 20 through bolts, the small pattern blocks 31 are clamped in concave holes 23 of the small arch-shaped seat 21 and are connected with the small arch-shaped seat 21 through bolts, and a slotted hole 32 is formed in the center of the bottom of the small pattern blocks 31.
The main body structure of the inner mold core 4 related to the embodiment comprises an inner mold core body 40, a wedge groove 41 and an opening 42; 4 wedge grooves 41 are formed in the outer side wall of the inner mold core body 40 at equal intervals, 4 circular arc-shaped openings 42 are formed in the bottom of the inner mold core body 40 at equal intervals, and the wedge grooves 41 are communicated with the openings 42.
The main structure of the flow channel assembly 5 according to the present embodiment includes an upper flow channel block 50, a lower flow channel block 51, an upper flow channel port 52, a lower flow channel port 53 and a through hole 54; an upper runner port 52 is formed in the upper runner block 50, a lower runner port 53 is formed in the lower runner block 51, the upper runner block 50 is connected with the lower runner block 51 through bolts, and after the upper runner block 50 is connected with the lower runner block 51, the upper runner port 52 and the lower runner port 53 are surrounded to form a through hole 54 of a funnel-shaped structure.
The upper cover 1 and the arched seat component 2 related to the embodiment are connected in a buckling way through the T-shaped groove 11 and the T-shaped block 22; the structural design of the arched seat component 2 meets the electromagnetic thermal analysis requirement of Marc (finite element analysis software), and the small arched seat 21 and the small pattern block 31 both meet the difference requirement of UG (interactive CAD/CAM system) and the runner component 5; the structures of the pattern block composition 3 and the inner mold core 4 meet the requirements of UG (interactive CAD/CAM system) on the tread extraction surface, and the basis of the division of the pattern block composition 3 into 8 blocks is the division result of the tread extraction surface; the wedge-shaped block 13 is matched with the wedge-shaped groove 41, and when the mold is removed, the wedge-shaped block 13 is pulled out, and the inner mold core 4 is not completely round, so that the tread is conveniently taken out; the groove 24 and the slot 32 are reserved positions for assembling the runner assembly 5; the upper runner block 50 and the lower runner block 51 are all cast by adopting malleable cast iron (KTH 300) sand molds, the matching surfaces of the upper runner block 50 and the lower runner block 51 after casting are subjected to fine grinding, and milling grooves for installing rubber sealing rings are milled on the tops of the through holes 54.
When the electromagnetic vulcanization tread segmented mold related to the embodiment is used, 4 gear pump injection machines are respectively connected with the runner components 5 through the flange pieces 6, the upper cover 1 is sleeved outside the inner mold core 4 to be assembled, the wedge-shaped blocks 13 of the upper cover 1 are matched with the wedge-shaped grooves 41 of the inner mold core 4 to form a complete circle, the gear pump injection machines are started, rubber enters between the pattern block components 3 and the inner mold core 4 through the through holes 54 by adopting a symmetrical injection method of the 4 gear pump injection machines to be vulcanized to form a tread, when the mold is opened, the upper cover 1 is lifted vertically by using an external machine, the pattern block components 3 with the collar are upwards moved by the arched seat components 2, the pattern block components 3 are separated from the tread, the wedge-shaped blocks 13 of the upper cover 1 are separated from the wedge-shaped grooves 41 of the inner mold core 4, gaps are formed in the complete circle, the tread demoulding is facilitated, the problem that the tread cannot be demoulded tightly attached to the inner mold core 4 is avoided, the tread is manually cut and separated from the runner components 5, and the rubber in the runner components 5 is extruded from top to bottom after the tread is demoulded, and the next production is carried out.
Example 2:
when the electromagnetic vulcanization tread segmented mold related to the embodiment is matched with a gear pump injection machine, the gear pump injection machine selects a single screw with the diameter of 200mm, and the total tread volume is 19000cm 3 For example, 4 gear pump injectors can complete injection within 20 seconds, and the injection volume of each gear pump injector is 4750cm 3 The injection speed is 1.4525t/h; the arrangement scheme of the pouring gate is two, namely 8 point pouring gates are adopted for inner wall injection, and 4 line pouring gates are adopted for side injection; the gear pump can improve the pressure of a machine head and reduce the extrusion temperature of the rubber compound: the operation of the gear pump reduces the screw pressure of the extruder, reduces the heat generation of the rubber compound during the conveying of the extruder, has short flow path of the rubber compound in the gear pump and low shearing heat generation, and greatly reduces the temperature of the rubber compound; meanwhile, the pressure build-up capability of the gear pump increases the pressure of the machine head: along with the increase of the rotation speed of the single screw, the temperature rise of the rubber compound extruded by the gear pump is small, which is beneficial to improving the performance of the rubber compound; gear pump can be loweredThe abrasion between the single screw rod and the machine barrel of the low extruder is reduced, the pressure on the thrust bearing of the reduction gearbox of the extruder is reduced, and the whole service life of the extruder is prolonged.
Example 3:
when the electromagnetic vulcanization tread segmented mold die and the gear pump are matched to extrude the short fiber rubber compound, the positive displacement conveying characteristic of the gear pump greatly reduces pressure fluctuation, ensures the stability of the pressure of a machine head, can improve the product appearance quality of the short fiber rubber compound, improves the stability of rubber extrusion, is beneficial to dispersion of short fibers and other fillers, reduces Payne effect, and ensures that the rubber compound maintains good dispersibility at high rotating speed; the sizing material is pressurized in the gear pump, the pressure is higher when the sizing material passes through the extruder head, the bonding degree between layers is increased, and the quality of an extrusion molding product is ensured; with the increase of the rotation speed of the single screw, the Mooney viscosity is reduced, the dispersibility of the short fibers in the rubber compound is ensured, and the quality of the extrusion molding product is more stable; with the increase of the rotation speed of the single screw, t 90 The short fiber rubber compound extruded at high speed has short vulcanization time, improves extrusion and vulcanization efficiency and reduces energy consumption;
example 4:
when the electromagnetic vulcanization tread segmented mold die and the gear pump are matched to extrude the composite material, the wet-slip resistance of the composite material extruded by the gear pump is the same as that of the composite material extruded by the screw extruder along with the increase of the rotating speed of the screw, the rolling resistance is obviously reduced, the energy consumption is reduced, and the effect is improved; meanwhile, the short fibers in the composite material can keep certain orientation degree and dispersibility along with the increase of the screw speed of the extruder, the quality of the extruded compound is ensured on the premise of improving the extrusion efficiency, and the quality is consistent with the experimental result in the performance test.
Example 5:
when the electromagnetic vulcanization tread segmented mold die and the gear pump are matched to extrude the composite material to prepare the rubber material, the extrusion efficiency, the surface quality, the physical and mechanical properties, the dynamic and physical properties and the orientation degree of the short fibers of the composite material are all improved when the rotating speed of a screw is 30r/min, the temperature of a machine barrel is 80 ℃ and the rotating speed of the gear pump is 25r/min, and the comprehensive performance of the rubber material is best.
Claims (6)
1. An electromagnetic vulcanization tread segmented mold, the main structure of which comprises an upper cover, an arch seat component, a pattern block component, an inner mold core, a runner component, a flange piece and a sealing ring; the upper cover is internally nested with an arch seat assembly, the arch seat assembly is provided with a pattern block assembly, the inner mold core and the upper cover are independently arranged, the bottom of the inner mold core is uniformly provided with four groups of flow passages at intervals, a sealing ring is arranged between the inner mold core and the runner component, and is characterized in that the upper cover is in buckle type connection with the arched seat component, the arched seat component is in bolt type connection with the pattern block component, and the inner mold core is connected with the runner component through a flange piece; the main body structure of the inner mold core comprises an inner mold core body, a wedge-shaped groove and an opening; the outer side wall of the inner mold core body is provided with 4 wedge-shaped grooves at equal intervals, the bottom of the inner mold core body is provided with 4 circular arc-shaped openings at equal intervals, and the wedge-shaped grooves are communicated with the openings; when the novel tire tread is used, 4 gear pump injection machines are respectively connected with the runner components through the flange pieces, the upper cover is sleeved outside the inner mold core to be assembled, the wedge-shaped blocks are matched with the wedge-shaped grooves to form a round shape, the gear pump injection machines are started, rubber is sent into the space between the pattern block components and the inner mold core to be vulcanized to form the tire tread, and the main structure of the upper cover comprises the side rings, the T-shaped grooves, the top plate and the wedge-shaped blocks; 8T-shaped grooves are formed in the inner side wall of the side ring at equal intervals, a top plate of a circular ring-shaped structure is arranged at the top of the side ring, and 4 wedge-shaped blocks are arranged in the inner ring of the top plate at equal intervals.
2. The electromagnetic curing tread segmented mold according to claim 1, wherein the main body structure of the arcuate seat comprises a large arcuate seat, a small arcuate seat, a T-shaped block, a concave hole and a groove; the 4 large arch-shaped seats and the 4 small arch-shaped seats are enclosed to form an arch-shaped seat according to the principle that the large arch-shaped seats are adjacent to the small arch-shaped seats, T-shaped blocks are arranged at the centers of the tops of the outer side walls of the large arch-shaped seats and the small arch-shaped seats, concave holes are formed in the inner side walls of the large arch-shaped seats and the small arch-shaped seats, and a groove is formed in the center of the bottom of the small arch-shaped seat.
3. The electromagnetic curing tread segmented mold according to claim 2, wherein the block-composed main structure comprises large blocks, small blocks and slots; the 4 large pattern blocks and the 4 small pattern blocks are enclosed to form a pattern block according to the principle that the large pattern blocks are adjacent to the small pattern blocks, the large pattern blocks are clamped in concave holes of the large arch seat and are connected with the large arch seat through bolts, the small pattern blocks are clamped in concave holes of the small arch seat and are connected with the small arch seat through bolts, and a slotted hole is formed in the center of the bottom of the small pattern blocks.
4. An electromagnetic curing tread segmented mold according to claim 3, wherein the runner component body comprises an upper runner block, a lower runner block, an upper runner port, a lower runner port and a through hole; an upper runner port is formed in the upper runner block, a lower runner port is formed in the lower runner block, the upper runner block is connected with the lower runner block through bolts, and after the upper runner block is connected with the lower runner block, the upper runner port and the lower runner port enclose a through hole in a funnel-shaped structure.
5. The electromagnetic curing tread segmented mold of claim 4, wherein the upper cover and the arcuate seat are snap-fit connected by a T-shaped slot and a T-shaped block; the structural design of the arched seat meets the electromagnetic thermal analysis requirement of Marc, and the small arched seat and the small pattern blocks meet the difference requirement of UG and the flow passage; the pattern block composition and the structure of the inner mold core meet the requirement of UG on the tread extraction surface, and the pattern block composition is divided into 8 blocks according to the division result of the tread extraction surface; the wedge-shaped block is matched with the wedge-shaped groove, and is pulled out when demoulding, and the internal mold core is not in a complete round shape; the groove and the slot are assembly reserved positions formed by the runners; the upper runner block and the lower runner block are cast by adopting a malleable cast iron sand mould, the matching surfaces of the upper runner block and the lower runner block after casting are subjected to fine grinding, and milling grooves for installing rubber sealing rings are milled at the tops of the through holes.
6. The electromagnetic vulcanizing tread segmented mold according to claim 1 or 4, wherein when the mold is opened, the upper cover is vertically lifted by using an external machine, the arch seat component is used for taking the block component to move upwards, the block component is separated from the tread, the wedge block is separated from the wedge groove, a complete round notch is formed, and after the tread and the runner component are manually cut, separated and demolded, rubber in the runner component is extruded from top to bottom, and the mold is closed for next production; the arrangement scheme of the gates is two, namely 8 pairs of gates are adopted for inner wall injection, and 4 pairs of gates are adopted for side injection.
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| US4826416A (en) * | 1988-06-02 | 1989-05-02 | The Goodyear Tire & Rubber Company | System for injection molding tire treads |
| US5798127A (en) * | 1995-09-15 | 1998-08-25 | The Goodyear Tire & Rubber Company | Injection molding of a tire component |
| CN2728742Y (en) * | 2004-06-28 | 2005-09-28 | 揭阳市天阳模具有限公司 | Adjustable mould for tyre of engineering truck |
| CN101125451A (en) * | 2007-09-23 | 2008-02-20 | 江志锡 | Tyre vulcanizing mould |
| CN102909799A (en) * | 2012-10-09 | 2013-02-06 | 河南省环球模具股份有限公司 | Tire vulcanization segmented mold of tapered-plane endocentric structure and application method thereof |
| CN208914511U (en) * | 2018-10-26 | 2019-05-31 | 青岛科技大学 | A kind of electromagnetism vulcanization tyre surface segmented mold mold |
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2018
- 2018-10-26 CN CN201811257643.9A patent/CN109228165B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4826416A (en) * | 1988-06-02 | 1989-05-02 | The Goodyear Tire & Rubber Company | System for injection molding tire treads |
| US5798127A (en) * | 1995-09-15 | 1998-08-25 | The Goodyear Tire & Rubber Company | Injection molding of a tire component |
| CN2728742Y (en) * | 2004-06-28 | 2005-09-28 | 揭阳市天阳模具有限公司 | Adjustable mould for tyre of engineering truck |
| CN101125451A (en) * | 2007-09-23 | 2008-02-20 | 江志锡 | Tyre vulcanizing mould |
| CN102909799A (en) * | 2012-10-09 | 2013-02-06 | 河南省环球模具股份有限公司 | Tire vulcanization segmented mold of tapered-plane endocentric structure and application method thereof |
| CN208914511U (en) * | 2018-10-26 | 2019-05-31 | 青岛科技大学 | A kind of electromagnetism vulcanization tyre surface segmented mold mold |
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