CN215903839U - Mold core and mold - Google Patents

Abstract

The utility model relates to a mold core and a mold, wherein the mold core comprises a fixed seat and a demolding component; the demoulding assembly is circumferentially and circumferentially arranged on the fixed seat and used for generating relative motion with a workpiece so as to demould; the die comprises the die core, an upper die assembly and a lower die assembly, wherein the lower die assembly comprises a lower middle die and a lower die, and the die core is fixedly arranged on the lower die; when the demolding is carried out, the lower middle die is fixed, the lower die is moved to enable the die core to move along with the lower die, the demolding component can be unfolded or closed under the action of the abutting force of the demolding component and the workpiece to change the outer diameter of the die core, meanwhile, the elastic performance of the workpiece is utilized, the die core is automatically separated from the workpiece, the workpiece does not need to be manually pulled manually and pried away from the die core, the probability that a tire is deformed or damaged due to human factors is effectively reduced, and the production efficiency and the product quality are improved.

Description

Mold core and mold

Technical Field

The utility model relates to the technical field of injection molding, in particular to a mold core and a mold.

Background

The rubber injection mold is a common device for manufacturing rubber products, and rubber raw materials are injected into the mold and are vulcanized at high temperature to be manufactured into the rubber products according to the shape of a cavity in the mold. The tire is a circular ring-shaped elastic rubber product, which can be roughly divided into an inflatable tire and a non-inflatable tire, and is generally manufactured by adopting an injection molding process, the non-inflatable tire is a tire which is not required to be inflated, air is not used, and the supporting and buffering performance is realized only by using the material and the structure of the tire, a mold core is used in the manufacturing process of the non-inflatable tire, the mold core mainly has the function of evacuating the interior of the tire from the inner side of the tire, and reinforcing ribs and ribs need to be added in the tire, so that the tire has better shock-absorbing performance and structural strength.

After the injection moulding process, the outer peripheral edge of the mold core is embedded into the inner space of a tire product, but most of the existing mold core is of an integral annular structure, reinforcing ribs and ribs are arranged inside the tire product, and the product is difficult to separate from the mold core when being demolded due to the reason of rubber physical properties, the improvement method adopted generally is to assemble the components by utilizing the components, glue is injected to a vulcanization demolding after assembling, the components assembled before final disassembling realize demolding, but the product is easy to deform when knocking the mold and pulling the product to fall off when the product is disassembled, the efficiency of the demolding method is still low, the finished product is easy to damage, great waste is caused, and the quality of the product is difficult to guarantee.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a mold core and a mold which are convenient for demolding, aiming at the problem that the conventional mold core is difficult to demold in the demolding process.

According to an aspect of the present application, there is provided a mold core comprising:

a fixed seat;

the demolding assembly is circumferentially and circumferentially arranged on the fixed seat;

the demolding component is configured to be capable of being unfolded or closed under the action of external force so as to change the size of the outer diameter of the mold core.

In one embodiment, the stripper assembly has a first outer diameter when the stripper assembly is in the expanded state; the stripper assembly has a second outer diameter when the stripper assembly is in the closed state;

the first outer diameter is larger than the second outer diameter, and the second outer diameter is larger than the outer diameter of the fixed seat.

In one embodiment, the demolding assembly comprises a plurality of blades, the blades are mounted on the fixed seat, and all the blades can synchronously rotate relative to the fixed seat under the action of external force to enable the demolding assembly to be unfolded or closed.

In one embodiment, the fixing seat is provided with a plurality of mounting grooves which are distributed at intervals along the circumferential direction of the fixing seat; each blade is rotatably mounted in one of the mounting slots.

In one embodiment, the fixing base includes:

the device comprises a chassis, a first groove and a second groove, wherein one end of the chassis is provided with a plurality of first grooves which are distributed at intervals along the circumferential direction of the chassis;

the cover body is arranged on one side of the chassis, which is provided with the first groove, and is provided with a plurality of second grooves which penetrate through two opposite ends of the cover body in the axial direction;

each first groove and one second groove are oppositely arranged and communicated with each other to jointly define and form one mounting groove.

In one embodiment, the demolding assembly further includes a plurality of connecting shafts, opposite ends of each connecting shaft are respectively limited between the chassis and the cover body, and each blade is sleeved on one connecting shaft and rotates relative to the fixing seat by taking the connecting shaft as a rotation center.

In one embodiment, the blade includes a connecting portion movably mounted in the mounting groove and a forming portion exposed from the fixing base and used for supporting a workpiece.

According to another aspect of the application, a mold using the mold core is provided, the mold further comprises an upper mold component and a lower mold component, the upper mold component is provided with an upper mold cavity, the lower mold component is provided with a lower mold cavity, and the upper mold cavity and the lower mold cavity jointly define a mold cavity for accommodating a material to be injected to mold a workpiece.

In some embodiments, the upper die assembly comprises an upper die and an upper middle die, two opposite ends of the upper middle die are communicated with each other, one end of the upper middle die, which is far away from the lower die assembly, is supported and mounted at one end of the upper die, and the upper die and the upper middle die jointly define the upper die cavity;

go up the mould subassembly still including the elastic element that can take place elastic deformation, install in go up between mould and the last well mould, go up the mould with go up well mould can break away from each other with the help of elastic element's elastic deformation.

In some embodiments, the lower die assembly comprises a lower middle die and a lower die, wherein two opposite ends of the lower middle die are communicated with each other, one end of the lower middle die, which is far away from the upper die assembly, is supported and mounted on the lower die, and the lower middle die and the lower die jointly define the lower die cavity;

the lower die assembly further comprises a connecting piece, the lower middle die is mounted on the lower die through the connecting piece, the die core is fixedly arranged on the lower die, and the lower die can move relative to the lower middle die to enable the die core to be separated from the workpiece.

Above-mentioned mould, through setting up fixing base and drawing of patterns subassembly at the mold core, and set up the mounting groove at the fixing base, make drawing of patterns subassembly movably install in the mounting groove, when needs carry out the drawing of patterns, set up well mould and well mould down in the mould, utilize the lower mould to move down for well mould down, and utilize the support between drawing of patterns subassembly and the work piece to hold power and make and produce relative motion between drawing of patterns subassembly and the fixing base in order to change the external diameter of mold core, and utilize the elastic property of work piece, make the drawing of patterns subassembly can break away from the work piece automatically, need not artificial manual work piece of dragging and prying the work piece from the mold core and can realize automatic drawing of patterns, the probability of work piece deformation or damage has been reduced because of human factor effectively, the quality of production efficiency and product has been improved.

Drawings

FIG. 1 is an exploded view of a first embodiment of a mold provided in accordance with the present invention;

fig. 2 is a sectional view showing an internal structure of a mold according to a first embodiment of the present invention;

FIG. 3 is an exploded view of a second embodiment of the mold provided by the present invention;

fig. 4 is a sectional view showing an internal structure of a mold according to a second embodiment of the present invention;

FIG. 5 is a schematic view of the blade in the mold core provided by the present invention in a horizontal state;

FIG. 6 is a schematic view of a mold core according to the present invention with blades in a flipped-up state;

FIG. 7 is a schematic view of a fixing base provided in the present invention;

FIG. 8 is an exploded view of the core provided by the present invention;

FIG. 9 is an enlarged view of the internal structure of the fixing base in the mold core according to the present invention;

FIG. 10 is a schematic view of a blade provided by the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The present invention provides a mold 10, comprising a mold core 300 for injecting a material into a cavity of the mold 10 in an injection molding process, and molding the material into a product having a certain shape both on the outside and inside after the material is solidified, wherein the mold core 300 is used for molding the inner structure of the product.

The following description will be made of the structure of the mold 10 in the present application, including the structure of the core 300 in the mold 10, taking the tire injection molding mold 10 as an example. The present embodiment is described as an example, and the technical scope of the present application is not limited thereto. It is understood that in other embodiments, the mold core 300 may be used for molding other products, and is not limited thereto.

The mold 10 of the first embodiment shown in fig. 1 to 2 includes an upper mold assembly 100, a lower mold assembly 500 and a mold core 300, wherein the upper mold assembly 100 and the lower mold assembly 500 are of an integral structure, the upper mold assembly 100 has an upper mold cavity 101 having the same shape as one part of a tire, the lower mold 500 has a lower mold cavity 501 having the same shape as another part of the tire, one end of the upper mold assembly 100 and one end of the lower mold assembly 500 abut against each other, so that a closed space is formed inside the mold 10, the closed space is a mold cavity defined by the upper mold cavity 101 and the lower mold cavity 501, and the mold core 300 is coaxially installed on the lower mold assembly 500 and is accommodated in the mold cavity.

In another embodiment, as shown in fig. 3 and 4, unlike the first embodiment of the mold 10, the upper mold assembly 100 and the lower mold assembly 500 in the mold 10 are of a split structure, the upper mold assembly 100 includes an upper mold 110 and an upper middle mold 120, the lower mold assembly 500 is also of a split structure, and the lower mold assembly 500 includes a lower mold 510 and a lower middle mold 520.

The upper and middle molds 120 have a cavity with the same shape as a part of the tire, and opposite ends of the upper and middle molds 120 are communicated with each other, an opening of one end of the upper and middle molds 120, which is far away from the lower mold assembly 500, is smaller than an opening of one end of the upper and middle molds 120, which is close to the lower mold assembly 500, one end of the upper and middle molds 120, which is far away from the lower mold assembly 500, is supported and mounted at one end of the upper mold 110, and the upper mold 110 and the upper and middle molds 120 define the upper mold cavity 101 together.

The upper mold 110 and the upper middle mold 120 are preferably coupled by a plurality of screws, and each screw is externally covered with an elastic member 130, and in one embodiment, the elastic member 130 is preferably a large spring. In a normal state, the upper mold 110 and the upper middle mold 120 are abutted together, and the elastic element 130 is in a compressed state. When the mold is released after the molding operation is completed, the upper mold 110 and the upper and middle molds 120 are separated from each other by the elastic member 130 being rebounded. The elastic member 130 is disposed between the upper mold 110 and the upper middle mold 120 to keep the distance between the upper mold 110 and the upper middle mold 120 consistent during the demolding process, so that the patterns of the upper and lower surfaces of the tire are kept consistent when the tire is demolded after molding.

The lower middle mold 520 also has a cavity with the same shape as a part of the tire, and two opposite ends of the lower middle mold 520 are communicated with each other, an opening of one end of the lower middle mold 520 away from the upper mold assembly 100 is smaller than an opening of one end of the lower middle mold 520 close to the upper mold assembly 100, one end of the lower middle mold 520 away from the upper mold assembly 100 is supported and mounted on the lower mold 510, and the lower middle mold 520 and the lower mold 510 define together to form a lower mold cavity 501. The lower die 510 and the lower middle die 520 are connected through a plurality of fixing pieces 530, the fixing pieces 530 are preferably screw rod screws and screw nuts, the screw rod screws penetrate through mounting holes at four corners of the lower middle die 520 and the lower die 510 to enable the lower die 510 and the lower middle die 520 to be connected together, the screw rod screws are further fixedly locked to the lower middle die 520 through the screw nuts, but the screw rod screws do not lock the lower die 510, so that the lower die 510 can move relative to the lower middle die 520 towards a direction close to the lower middle die 520 or away from the lower middle die 520; meanwhile, the mold core 300 is fixedly disposed on the lower mold 510 and is coaxial with the lower mold 510. In this way, when the tire is released from the mold, the lower mold 510 is moved away from the lower middle mold 520, and the mold core 300 moves away from the lower middle mold 520 together with the lower mold 510, so that the mold core 300 and the tire move relatively to each other to complete the releasing.

In the mold 10 of the two embodiments, the top of the upper mold assembly 100 is further provided with a plurality of injection holes and vent holes (not shown in the figure) for injecting liquid or semisolid rubber materials into the mold cavity, the upper mold cavity 101 and the lower mold cavity 501 are used for forming the external structure of the tire, the mold core 300 is used for forming the internal structure of the tire, and the vent holes are used for exhausting gas in the mold cavity so that the rubber materials can be tightly pressed into the mold cavity.

In the manufacturing process of the tire, the size of the space of the mold cavity needs to be reasonably controlled, so that the space of the mold cavity is reduced according to the volume of the tire in a certain proportion, the size of the tire in the mold cavity is smaller than the required size, when the tire is demolded, the tire utilizes the expansion performance of the rubber material, the size difference is automatically supplemented, and the size of the demolded tire meets the required size range. In some embodiments, the mold cavity has a spatial dimension of 0.5 to 0.99 of the volumetric dimension of the tire.

The space size of the mold cavity and the volume size of the tire are reduced in equal proportion according to the proportion of 0.5-0.99, wherein the reduction proportion parameter of 0.5-0.99 is mainly determined according to the expansion coefficient of the injected rubber material.

In some embodiments, as shown in fig. 5 to 8, the mold core 300 includes a fixing seat 310 and a demolding component 320, the demolding component 320 is mounted on the fixing seat 310 along the circumferential direction of the fixing seat 310, and is used for supporting the inner surface of the tire and shaping the inner structure of the tire, and the demolding component 320 can be unfolded or closed under the action of external force to change the size of the outer diameter of the mold core 300. When stripper assembly 320 is in the expanded state, stripper assembly 320 has a first outer diameter; when stripper assembly 320 is in the closed state, stripper assembly 320 has a second outer diameter; wherein the first outer diameter is larger than the second outer diameter, and the second outer diameter is larger than the outer diameter of the fixed base 310, so as to enable the demolding component 320 to generate relative movement with the workpiece to enable the workpiece to be separated from the mold core 300 during demolding.

In a preferred embodiment, the fixing base 310 is a cylindrical structure, one end of the fixing base 310 is provided with a plurality of mounting grooves 313 distributed at intervals along a circumferential direction, and each mounting groove 313 extends from an outer circumferential surface of the fixing base 310 along a radial direction of the fixing base 310 towards a central axis direction of the fixing base 310. In some embodiments, the fixing base 310 further includes a plurality of mounting holes 314, the plurality of mounting holes 314 are distributed at intervals along the circumferential direction of the fixing base 310, and opposite ends of each mounting hole 314 communicate with two adjacent mounting grooves 313.

In some embodiments, the demolding assembly 320 includes a plurality of blades 321 and a plurality of connecting shafts 322, the plurality of blades 321 are respectively embedded in the plurality of mounting grooves 313 along a circumferential direction of the fixing base 310, the remaining portions are exposed out of the fixing base 310 and support an inner surface of the tire, the plurality of connecting shafts 322 are distributed at intervals along the circumferential direction of the fixing base 310, opposite ends of each connecting shaft 322 along a length direction are respectively limited in two adjacent mounting holes 314, and each blade 321 is correspondingly sleeved on one connecting shaft 322, so that each blade 321 can rotate relative to the fixing base 310 around one connecting shaft 322.

So, a plurality of blades 321 alright rotate simultaneously around many connecting axles 322 under the action of gravity to when removing the mould core 300 downwards and drawing of patterns, all blades 321 can make drawing of patterns subassembly 320 expand or close for fixing base 310 synchronous rotation under the exogenic action, thereby make the external diameter of mould core 300 change, and utilize the tire to take place recoverable elastic deformation, also for the tire motion when making a plurality of blades 321 for fixing base 310 synchronous rotation, impel the tire to break away from mould core 300 automatically, thereby realize automatic drawing of patterns.

Specifically, in some embodiments, as shown in fig. 7 and 8, the fixing base 310 includes a base 311 and a cover 312, the base 311 is preferably a disk, one end of the base 311 facing the cover 312 is provided with a plurality of first grooves 3111 with a certain depth at intervals along a circumferential direction of the base 311, a length direction of each first groove 3111 is consistent with a radial direction of the base 311, and each first groove 3111 extends from a circumferential surface of the base 311 along the radial direction of the base 311 toward a central axis direction of the base 311.

The cover 312 is preferably a disc shape, the diameter of the cover 312 is equal to the diameter of the base 311, the cover 312 is provided with a plurality of second grooves 3121 penetrating through two opposite ends of the cover 312 in the axial direction, the plurality of second grooves 3121 are distributed at intervals along the circumferential direction of the cover 312, the length direction of each second groove 3121 is parallel to one of the first grooves 3111, and each second groove 3121 extends from the circumferential surface of the cover 312 along the radial direction of the cover 312 towards the central axis direction of the cover 312.

The cover 312 is fixed to one side of the axis of the chassis 311, specifically, in a preferred embodiment, one end of the cover 312 is attached to one end of the chassis 311, where the first groove 3111 is formed, and each second groove 3121 of the cover 312 is disposed opposite to one first groove 3111 of the chassis 311, so that one first groove 3111 and one second groove 3121 are communicated with each other, and meanwhile, the cover 312 and the chassis 311 are fixed to each other by screws and do not move relative to each other.

In this way, each first groove 3111 and each second groove 3121 jointly define a mounting groove 313, so that the fixing base 310 has a plurality of mounting grooves 313 distributed at intervals along the circumferential direction, and at the same time, the mounting groove 313 has a certain depth and length, one end of the mounting groove 313 along the depth direction communicates with an end surface close to the lower mold 500, and one end of the mounting groove 313 along the length direction communicates with the circumferential surface of the fixing base 310.

Specifically, in some embodiments, the bottom plate 311 further has a plurality of third grooves 3112 spaced apart along the circumferential direction on the end surface where the first groove 3111 is opened, and two opposite ends of each third groove 3112 along the length direction communicate with two adjacent first grooves 3111. The cover body 312 is provided with a plurality of fourth grooves 3122 distributed at intervals along the circumferential direction on the end surface attached to the chassis 311, each fourth groove 3122 communicates with two adjacent second grooves 3121 along the opposite ends of the length direction, and the length direction of each fourth groove 3122 is parallel to one third groove 3112. When the cover 312 is fixed to the chassis 311, one end surface of the cover 312, which is provided with the fourth groove 3122, is attached to the end surface of the chassis 311, which is provided with the third groove 3112, because the cover 312 is fixed to the chassis 311 and then does not move relatively, each third groove 3112 and one fourth groove 3122 define a mounting hole 314 together.

Thus, as shown in fig. 9, the blade 321 is sleeved outside the connecting shaft 322, and the opposite ends of the connecting shaft 322 are respectively limited at one end of the two adjacent mounting holes 314, so that the blade 321 can rotate relative to the fixing base 310 by using the connecting shaft 322 as a rotating shaft.

In some embodiments, as shown in fig. 5 and 6, the blade 321 is a plate-shaped structure with a certain thickness, and the thickness of the blade 321 is slightly smaller than the width of the mounting groove 313, so that a certain gap is formed between the blade 321 and the mounting groove 313, so that the blade 321 can move flexibly in the mounting groove 313, and the mold core 300 can be separated from the tire during demolding.

In a preferred embodiment, as shown in fig. 10, the blade 321 is an integrally formed structure, and includes a connecting portion 3211 and a forming portion 3212, wherein the connecting portion 3211 is used for connecting with the fixing base 310, the forming portion 3212 is used for forming a reinforcing rib and a rib on the inner surface of the tire, the length of the blade 321 is greater than the length of the mounting groove 313, and the length of the connecting portion 3211 is slightly equal to the length of the mounting groove 313. When the blade 321 is disposed in the mounting groove 313 and mounted on the fixing base 310, the connecting portion 3211 of the blade 321 is completely embedded in the mounting groove 313, and the forming portion 3212 is exposed from the fixing base 310 because the length of the blade 321 is greater than that of the mounting groove 313. The adjacent two blades 321 and the circumferential surface of the fixing base 310 define a forming gap, and each forming gap is communicated with two opposite end surfaces of the mold core 300, so that the mold core 300 forms a plurality of forming gaps along the circumferential direction, and the gaps are used for forming reinforcing ribs inside the tire.

Specifically, in some embodiments, each blade 321 has a through hole 3213 formed in an end surface of the connecting portion 3211, the through hole 3213 communicates two end surfaces of the blade 321 in the thickness direction, and the connecting shaft 322 of the fixing base 310 passes through the through hole 3213, so that the blade 321 is sleeved outside the connecting shaft 322, and can rotate around the connecting shaft 322. One end of the forming portion 3212 of each blade 321, which is away from the fixing base 310 in the length direction, is further provided with a fifth groove 3214, the fifth groove 3214 penetrates through opposite ends of the forming portion 3212 in the thickness direction, and is used for forming ribs inside the tire, and the shape of the fifth groove 3214 is determined according to the shape of the ribs inside the tire, and may be an arc shape, a square shape, a triangular shape, or other irregular shapes.

When the mold core 300 is specifically installed, firstly, the bottom plate 311 is placed on a plane; then, the connecting shaft 322 passes through the through hole 3213 of the blade 321, so that the blade 321 is sleeved on the connecting shaft 322; then, the connecting portion 3211 of the blade 321 is partially embedded in the first groove 3111, and the plurality of connecting shafts 322 are placed in the third grooves 3112 of the chassis 311, wherein opposite ends of each connecting shaft 322 along the length direction are respectively placed at one end of two adjacent third grooves 3112, so that two ends of each connecting shaft 322 are overlapped with the two adjacent third grooves 3112, and at this time, a portion of the connecting portion 3211 of the blade 321 and the forming portion 3212 are exposed out of the chassis 311; finally, the cover 312 is placed on the end surface of the chassis 311 having the first groove 3111 and the third groove 3112, the second groove 3121 of the cover 312 is placed opposite to the first groove 3111 of the chassis 311, the fourth groove 3122 of the cover 312 is placed opposite to the third groove 3112 of the chassis 311, the portion of the connecting portion 3211 exposed out of the chassis 311 is embedded in the second groove 3121 of the cover 312, the opposite ends of the connecting shaft 322 are covered by the fourth groove 3122 of the cover 312, and the cover 312 and the chassis 311 are fixedly connected by screws, so that the cover 312 and the chassis 311 do not move relatively. In this way, the opposite ends of the connecting shaft 322 are received in the mounting holes 314 formed by the third groove 3112 and the fourth groove 3122, and the forming portion 3212 of the blade 321 is exposed out of the fixing base 310 and can rotate around the connecting shaft 322 to turn up relative to the fixing base 310.

When the mold 10 is installed, the lower mold assembly 500 is first fixed on a plane; then placing the mold core 300 into the lower mold cavity 501 of the lower mold assembly 500, wherein the chassis 311 of the mold core 300 is provided with a mounting hole, and mounting the mold core 300 and the lower mold assembly 500 to enable the central axis of the mold core 300 to be coaxial with the central axis of the lower mold cavity 501; and the upper die assembly 100 is abutted against one end face of the lower die assembly 500 close to the upper die 100, so that the upper die cavity 101, the die core 300 and the lower die cavity 501 are coaxially arranged, and thus, the die 10 is installed.

When the tire is produced, firstly, a rubber material is injected into a mold cavity from an injection hole of the upper mold assembly 100, and simultaneously, gas in the mold cavity is exhausted by utilizing an exhaust hole, so that the rubber material is filled and tightly pressed into the mold cavity.

The demolding is then started, the purpose of which is to remove the tyre from the cavity of the mold 10 and to disengage it from the core 300. The mold releasing process is described by taking as an example the mold 10 having the structure of the second embodiment, as shown in fig. 3, in which the arrow direction is the mold releasing direction.

During demolding, the upper die assembly 100 is stationary and fixed in an initial state; first, the lower mold 510 of the lower mold assembly 500 is moved downward in a direction away from the upper mold assembly 100, after a certain distance is moved, a certain gap is generated between the upper middle mold 120 and the lower middle mold 520 by the mold release force, at this time, a gap is also generated between the upper middle mold 120 of the upper mold assembly 100 and the upper mold 110 by the mold release force, the elastic element 130 installed between the upper mold 110 and the upper middle mold 120 is returned to a normal state from a compressed state by means of elastic force, so that the upper mold 110 and the upper middle mold 120 are sprung apart, and the upper mold assembly 100 is turned up relative to the lower mold assembly 500, an angle between the upper mold assembly 100 and the lower mold assembly 500 is changed from 0 degree to 90 degrees, at this time, the tire is separated from the upper mold assembly 100, and the upper half of the tire is exposed.

Then, the lower mold 110 is moved downwards to expose the lower half of the tire and the mold core 300, at this time, the forming part 3212 of the mold core 300 supports the inner surface of the tire, since the mold core 300 is fixed to the lower mold 510, the mold core 300 also moves downwards along with the lower mold 510, normally, the blades 321 of the mold core 300 cannot move relative to the fixed part, at this time, in order to demold, the inner periphery of the tire needs to be manually pried away from the mold core 300 along the circumferential direction of the tire to separate the tire from the mold core 300, and then the mold core 300 is taken away to complete the demold. Whereas the blades 321 in the mold core 300 of the present application can rotate relative to the holders 310, since the tire is located in the lower mold cavity 501, and the opening of the lower middle mold 520 at the end away from the upper mold assembly 100 is smaller than the opening of the lower middle mold 520 at the end near the upper mold assembly 100, when the mold core 300 moves downward together with the lower mold 510, the tire is held against downward movement, and therefore at the time of demolding, under the action of the tire to the blades 321, the blades 321 will turn upwards around the connecting shaft 322 relative to the fixing base 310, the rubber material of the tire has certain elasticity, so that the tire can be subjected to recoverable deformation under the action of external force, the inner periphery of the tire can be pried by the blades 321 under the action of the blades 321, the blades 321 and the tire can move relatively to separate the mold core 300 from the tire, and the elastic deformation of the tire under the action of the blades 321 can be recovered immediately after the tire is separated from the mold core 300. The tire is now located in the lower mold cavity 501 without further restraint, and the final finished product is then obtained by manually removing the tire.

If the mold 10 of the first embodiment is used for demolding, after the molding process is finished, the upper mold assembly 110 is taken out, the lower mold assembly 510 pops up the mold core 300 and the tire, and at this time, the mold core 300 and the tire still need to be lifted up together by other tools by hand, and then the mold is demolded by the relative movement between the blade 321 and the fixed seat 310, compared with the mold 10 of the first embodiment, when demolding is carried out by using the mold 10 of the second embodiment, automatic demolding can be completed without manual intervention in the whole process.

In addition, as mentioned before, the size of the mould cavity in this application is reduced by the volume of the tire according to the preset proportion in an equal proportion and is set, so that the volume of the rubber material in the mould cavity is smaller than the actual volume of the tire, when the tire is separated from the cavity, the self volume is enlarged by utilizing the expansion performance of the rubber material, the final volume of the finished tire product can reach the size required by a user, and meanwhile, the expanded tire can be separated from the mold core to a certain extent, so that the demolding of the tire has more efficiency and convenience.

In the mold 10, the mold core 300 is designed into two parts, namely the fixed seat 310 and the demolding component 320, the mounting groove 313 is arranged on the fixed seat 310, so that the demolding component 320 can be movably mounted in the mounting groove 313, when demolding is required, the upper middle mold 120 and the lower middle mold 520 are arranged in the mold, the mold core 300 is fixed on the lower mold 510, the lower mold 510 and the mold core 300 move downwards relative to the lower middle mold 520, relative motion is generated between the demolding component 320 and the fixed seat 310 by using the abutting force of the demolding component 320 and a workpiece to change the outer diameter of the mold core 300, and the demolding component 320 can be automatically separated from a tire by using the elastic performance of the workpiece without manually pulling the tire and prying the tire from the mold core 300, so that the probability of deformation or damage of the tire caused by human factors is effectively reduced, and the production efficiency and the quality of products are improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A mold core, comprising:

a fixed seat;

the demolding assembly is circumferentially and circumferentially arranged on the fixed seat;

the demolding component is configured to be capable of being unfolded or closed under the action of external force so as to change the size of the outer diameter of the mold core.

2. The mold core of claim 1, wherein the stripper assembly has a first outer diameter when the stripper assembly is in the expanded state; the stripper assembly has a second outer diameter when the stripper assembly is in the closed state;

the first outer diameter is larger than the second outer diameter, and the second outer diameter is larger than the outer diameter of the fixed seat.

3. The mold core according to claim 1, wherein said stripper assembly comprises a plurality of blades mounted to said holder, all of said blades being capable of rotating synchronously relative to said holder under an external force to cause said stripper assembly to open or close.

4. The mold core according to claim 3, wherein the fixing seat is provided with a plurality of mounting grooves which are distributed at intervals along the circumferential direction of the fixing seat; each blade is rotatably mounted in one of the mounting slots.

5. The mold core of claim 4, wherein said retainer comprises:

the device comprises a chassis, a first groove and a second groove, wherein one end of the chassis is provided with a plurality of first grooves which are distributed at intervals along the circumferential direction of the chassis;

the cover body is arranged on one side of the chassis, which is provided with the first groove, and is provided with a plurality of second grooves which penetrate through two opposite ends of the cover body in the axial direction;

each first groove and one second groove are oppositely arranged and communicated with each other to jointly define and form one mounting groove.

6. The mold core according to claim 5, wherein the demolding assembly further comprises a plurality of connecting shafts, opposite ends of each connecting shaft are respectively limited between the chassis and the cover body, and each blade is sleeved on one connecting shaft and rotates relative to the fixing seat by taking the connecting shaft as a rotation center.

7. The mold core according to claim 4, wherein the blade comprises a connecting part and a forming part, the connecting part is movably mounted in the mounting groove, and the forming part is exposed out of the fixing seat and used for supporting a workpiece.

8. A mold comprising the mold core of any one of claims 1 to 7, the mold further comprising an upper mold assembly having an upper mold cavity and a lower mold assembly having a lower mold cavity, the upper mold cavity and the lower mold cavity together defining a mold cavity for receiving material to be injected to mold a workpiece.

9. The mold of claim 8, wherein the upper mold assembly comprises an upper mold and an upper middle mold, opposite ends of the upper middle mold are communicated with each other, one end of the upper middle mold, which is far away from the lower mold assembly, is supported and mounted on one end of the upper mold, and the upper mold and the upper middle mold together define the upper mold cavity;

go up the mould subassembly still including the elastic element that can take place elastic deformation, install in go up between mould and the last well mould, go up the mould with go up well mould can break away from each other with the help of elastic element's elastic deformation.

10. The mold of claim 8, wherein the lower mold assembly comprises a lower middle mold and a lower mold, opposite ends of the lower middle mold are communicated with each other, one end of the lower middle mold, which is far away from the upper mold assembly, is supported and mounted on the lower mold, and the lower middle mold and the lower mold define the lower mold cavity together;

the lower die assembly further comprises a connecting piece, the lower middle die is mounted on the lower die through the connecting piece, the die core is fixedly arranged on the lower die, and the lower die can move relative to the lower middle die to enable the die core to be separated from the workpiece.

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