CN216001274U - Injection molding mold for ultra-high molecular weight polyethylene - Google Patents
Injection molding mold for ultra-high molecular weight polyethylene Download PDFInfo
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- CN216001274U CN216001274U CN202122601575.7U CN202122601575U CN216001274U CN 216001274 U CN216001274 U CN 216001274U CN 202122601575 U CN202122601575 U CN 202122601575U CN 216001274 U CN216001274 U CN 216001274U
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Abstract
The utility model discloses an injection molding mould for ultra-high molecular weight polyethylene, which comprises a first inner mould and a second inner mould which are correspondingly arranged, wherein the butt joint surface of the two inner moulds is provided with a mould cavity, and the two inner moulds can be butted, combined or separated; and the outer surface of the first inner die is also provided with a wound electromagnetic heating coil, the electromagnetic heating coil extends to the outer surface of the second inner die, the combination and the separation of the first inner die and the second inner die are not hindered, and the second inner die is also provided with a feeding port communicated with the die cavity. The utility model discloses the fashioned characteristic of mode with electromagnetic heating combines ultra high molecular weight polyethylene as the basis, has designed the mould of brand-new structure, has solved the mould and need heat fast, continuously pressurizes and pass through the slow refrigerated problem of cold runner that the mould set up with compressed air to the product, still increased the heat insulating board for improving heating efficiency between the mould inside and outside mould, further improves heating efficiency, has realized ultra high molecular weight polyethylene injection moulding.
Description
Technical Field
The utility model relates to an ultra high molecular weight polyethylene injection moulding technical field, a injection moulding mould for ultra high molecular weight polyethylene specifically says so.
Background
The ultra-high molecular weight polyethylene is a high molecular material and has excellent corrosion resistance and wear resistance, and the ultra-high molecular weight polyethylene engineering plastic pump produced by the material can be widely applied to the environment needing acid and alkali corrosion resistance and wear resistance.
However, the molding technology of ultra-high molecular weight polyethylene products always adopts the traditional mould pressing technology, namely, raw materials are put into a mould, the mould and the raw materials are put into an oven together for heating and heat preservation, and then the raw materials are pressed and cooled by a hydraulic press to obtain the required product. The existing production process has the disadvantages of high labor intensity, low production efficiency and high energy consumption.
In recent years, a new technology is used for extrusion molding of ultrahigh molecular weight polyethylene plates and bars in the market, the product molding is good, the production efficiency is high, whether the extrusion molding technology can be applied to the injection molding technology is a problem which is difficult to solve, the traditional injection molding technology is certainly not feasible, as the ultrahigh molecular weight polyethylene is heated through a charging barrel, molten glue is injected into a mold, the glue is cooled too fast, the shrinkage is large, the product which is cooled is large in deformation, the problem of serious cracking and deformation can occur, qualified products cannot be obtained at all, and therefore, the mold must be heated first to enable the temperature of the mold to reach the temperature at which a finished product can be molded quickly; in addition, the original mould pressing process is simulated to continuously pressurize the product, so that the finished product is prevented from deforming and cracking, and the product is formed.
Aiming at the problems, a new forming process can be established and an injection mold with a brand-new structure can be designed and manufactured, the existing new process needs to use an oil temperature machine to heat the mold to 125-170 ℃, then molten ultrahigh molecular weight polyethylene material is injected, finally the material and the mold are cooled to below 90 ℃, and a qualified finished product is obtained after mold opening and demolding.
However, the oil temperature machine for the die can heat the die to the required temperature, but the heating and temperature rising speed is slow, and the cooling process cannot be too fast, so that the product quality is influenced, the whole process time is long, and the production efficiency is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an injection moulding mould for ultra high molecular weight polyethylene to the not enough of prior art existence, its technical scheme as follows:
an injection molding mold for ultra-high molecular weight polyethylene comprises a first inner mold and a second inner mold which are correspondingly arranged, wherein a mold cavity is arranged at the butt joint surface of the two inner molds, and the two inner molds can be butted, combined or separated; and the outer surface of the first inner die is also provided with a wound electromagnetic heating coil, the electromagnetic heating coil extends to the outer surface of the second inner die, the combination and the separation of the first inner die and the second inner die are not hindered, and the second inner die is also provided with a feeding port communicated with the die cavity.
The outer side of the first inner die is also provided with a first outer die, the first outer die and the first inner die are integrally installed, and a heat insulation plate is further installed between the first outer die and the first inner die.
Furthermore, a second outer die is arranged on the outer side of the second inner die, the second outer die and the second inner die are integrally installed, and a thermal insulation plate is also installed between the second outer die and the second inner die; and the injection port penetrates through the second outer die and the second inner die and is communicated with the die cavity.
Furthermore, a base is further arranged on the outer side of the first outer die, a driving mechanism is further arranged on the base, a demolding thimble is mounted on the driving mechanism, and the demolding thimble penetrates through the first outer die, the thermal insulation plate and the first inner die and extends into the die cavity.
Further, temperature measuring holes are formed in the first inner die and the second inner die, and the temperature measuring holes extend from the surfaces of the two inner dies to the inner side in an inclined mode.
Furthermore, the end face of the die cavity formed by the first inner die and the second inner die is also provided with a heightened stock bin part matched with the die cavity, so that when the two inner dies displace, the die cavities in the two inner dies are not opened, and the outer sides of the butt joint surfaces of the two inner dies correspondingly form a gap opening.
Furthermore, the first outer die and the second outer die are provided with compressed air cold runner inlets and outlets; an inlet and an outlet of a compressed air cold runner on the first outer die extend inwards to extend through the heat insulation plate and the first inner die to a gap opening position; and the compressed air cold runner on the second outer die extends into the second inner die through the heat insulation plate in the inlet and outlet box.
Has the advantages that: the utility model discloses following beneficial effect has: the utility model is provided with the electromagnetic heating coil, the two inner molds are rapidly heated up in an electromagnetic heating mode, the heating power per unit area is large, the heating thermal efficiency can reach more than 90 percent, and the heating device is used for heating the mold, the heating speed is fast, the heating time of the original oil temperature machine of the die with the weight of 200Kg to the required temperature is more than 1.5 hours, the time is shortened to be within 10 minutes after electromagnetic heating, the purpose of fast heating can be realized, the utility model combines the characteristic of the molding of the ultra-high molecular weight polyethylene based on the heating mode, designs the mould with a brand new structure, solves the problems that the mould needs to be heated quickly, the product is pressurized continuously and the compressed air is used for cooling slowly through the cold runner arranged on the mould, increases a heat insulation plate between the inner mould and the outer mould of the mould for improving the heating efficiency, further improves the heating efficiency and realizes the injection molding of the ultra-high molecular weight polyethylene; the utility model discloses changed the old pressure injection technology since many years, the energy consumption is low, production efficiency obviously improves, is more than 5 times of traditional technology to can realize automated production, very big alleviate workman's intensity of labour.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a view of the injection molding process of the present invention;
FIG. 3 is a drawing of the injection molding, demolding and mold opening structure of the present invention;
fig. 4 is a view showing a structure of a mold according to the prior art.
Detailed Description
The present invention will be further clarified by the following embodiments with reference to the attached drawings, which are implemented on the premise of the technical solution of the present invention, and it should be understood that these embodiments are only used for illustrating the present invention and are not used for limiting the scope of the present invention.
As shown in fig. 1, 2 and 3, an injection molding mold for ultra-high molecular weight polyethylene comprises a first inner mold 1 and a second inner mold 2 which are correspondingly arranged, wherein a mold cavity 3 is arranged at the butt joint surface of the two inner molds, and the two inner molds can be butted and combined or separated; and the outer surface of the first inner die 1 is also provided with a wound electromagnetic heating coil 4, the electromagnetic heating coil 4 extends to the outer surface of the second inner die 2, but the combination and separation of the first inner die 1 and the second inner die 2 are not hindered, and the second inner die 2 is also provided with a feeding port 5 communicated with the die cavity 3.
A first outer die 11 is arranged on the outer side of the first inner die 1, the first outer die 11 and the first inner die 1 are integrally installed, and a heat insulation plate 6 is also installed between the first outer die 11 and the first inner die 1; a second outer die 21 is arranged on the outer side of the second inner die 2, the second outer die 21 and the second inner die 2 are integrally installed, and a thermal insulation board 6 is also installed between the second outer die 21 and the second inner die 2; and the injection port 5 communicates with the mold cavity 3 through the second outer mold 21 and the second inner mold 2.
A base 7 is further arranged on the outer side of the first outer die 11, a driving mechanism 8 is further arranged on the base 7, a demolding thimble 9 is mounted on the driving mechanism 8, and the demolding thimble 9 penetrates through the first outer die 11, the heat insulation plate 6 and the first inner die 1 to extend into the die cavity 3; temperature measuring holes 10 are further formed in the first inner die 1 and the second inner die 2, and the temperature measuring holes 10 extend from the surfaces of the two inner dies to the inner side in an inclined mode.
The end face of the die cavity 3 formed by the first inner die 1 and the second inner die 2 is also provided with a heightened bin part 12 matched with the die cavity 3, so that when the two inner dies generate displacement, the die cavity 3 in the two inner dies is not opened, and the outer sides of the butt joint surfaces of the two inner dies correspondingly form a gap opening 13.
The first outer die 11 and the second outer die 21 are both provided with a compressed air cold runner inlet and outlet 14; a compressed air cold runner inlet and outlet 14 on the first outer die 11 extends inwards to extend through the heat insulation plate 6 and the first inner die 1 to a position of a gap opening 13; and the compressed air cold runner inlet and outlet 14 on the second outer die 21 extends in the box and penetrates through the heat insulation plate 6 to extend into the second inner die 2.
As shown in fig. 4, the butt joint face of the centre form of both sides is laminated completely in prior art injection molding machine mould, during the use, pours into the raw materials that the melting is good through the sprue into, waits to cool off the back die sinking, and the demoulding thimble is ejecting, obtains the product that needs, nevertheless because the characteristic of ultra high molecular weight polyethylene, has very big deformation shrink, and the product of doing so can ftracture, warp, and the utility model discloses an above-mentioned problem has been solved to special mould, the utility model discloses combine electromagnetic heating and former die pressing technology to realize through following mode:
as shown in fig. 1 and 2, the utility model discloses a special mould increases in the die cavity terminal surface department that two centre forms constitute, increases one and die cavity complex feed bin part, during the specific use, as shown in fig. 1, the die cavity terminal surface part of two centre forms is laminated completely, is gapless.
The surface of first centre form is provided with electromagnetic heating coil to be separated through the high temperature resistant heat insulating board that sets up between two centre forms and two external molds, the heat insulating board is fixed through high temperature glue, opens the electromagnetic heating controller and passes through electromagnetic heating coil to two centre forms heating, and carries out the temperature measurement through the temperature measurement hole that sets up, in case the mould temperature reaches the temperature of settlement and just can begin action on next step, through thermal-insulated of heat insulating board, the heat will concentrate on two centre forms, further improves heating efficiency.
As shown in fig. 2, after the set temperature is reached, the raw material is injected from the injection port, the two internal molds will displace under the action of the pressure of the raw material, but due to the arrangement of the bin part, the internal mold cavity is not completely opened, the position outside the butt joint surface of the mold cavity is opened, a gap opening degree is formed, and when the gap opening degree reaches a specified opening degree size, the injection action is stopped.
And the inner die and the outer die on the two sides are continuously pressurized inwards, compressed air is injected through the inlet and the outlet of the compressed air cold runner, and meanwhile, the cooling fan arranged outside the die is synchronously opened, so that the product is slowly cooled along with the die, the opening size of the gap opening degree is synchronously reduced along with the reduction of the temperature in the cooling process until the temperature of the die is reduced to be lower than 90 ℃, and the gap opening degrees of the inner dies on the two sides are basically attached again, so that the die can be opened.
As shown in fig. 4, the back is opened to the centre form of both sides, utilizes actuating mechanism to ejecting through the product of drawing of patterns thimble with inside, through this the utility model discloses a product that technical scheme obtained, the size is accurate, and hardly there is the deformation, does not have the warpage that traditional injection moulding product can't solve and the phenomenon of shrink.
Generally, the utility model is provided with the electromagnetic heating coil, the two inner molds are rapidly heated up in an electromagnetic heating mode, the heating power per unit area is large, the heating thermal efficiency can reach more than 90 percent, and the electromagnetic heating coil is used for heating the mold, the heating speed is fast, the heating time of the original oil temperature machine of the die with the weight of 200Kg to the required temperature is more than 1.5 hours, the time is shortened to be within 10 minutes after electromagnetic heating, the purpose of fast heating can be realized, the utility model combines the characteristic of the molding of the ultra-high molecular weight polyethylene based on the heating mode, designs the mould with a brand new structure, solves the problems that the mould needs to be heated quickly, the product is pressurized continuously and the compressed air is used for cooling slowly through the cold runner arranged on the mould, increases a heat insulation plate between the inner mould and the outer mould of the mould for improving the heating efficiency, further improves the heating efficiency and realizes the injection molding of the ultra-high molecular weight polyethylene; the utility model discloses changed the old pressure injection technology since many years, the energy consumption is low, production efficiency obviously improves, is more than 5 times of traditional technology to can realize automated production, very big alleviate workman's intensity of labour.
The above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the invention and the appended claims, and all equivalent changes and modifications made according to the claims should be included in the scope of the present invention.
Claims (6)
1. The utility model provides an injection moulding mould for ultra high molecular weight polyethylene which characterized in that: the device comprises a first inner die (1) and a second inner die (2) which are correspondingly arranged, wherein a die cavity (3) is arranged at the butt joint surface of the two inner dies, and the two inner dies can be butted, combined or separated; and the outer surface of the first inner die (1) is also provided with a wound electromagnetic heating coil (4), the electromagnetic heating coil (4) extends to the outer surface of the second inner die (2), but the combination and separation of the first inner die (1) and the second inner die (2) are not hindered, and the second inner die (2) is also provided with a filling port (5) communicated with the die cavity (3).
2. An injection molding mold for ultra-high molecular weight polyethylene according to claim 1, wherein: a first outer die (11) is further arranged on the outer side of the first inner die (1), the first outer die (11) and the first inner die (1) are integrally installed, and a heat insulation plate (6) is further installed between the first outer die and the first inner die;
a second outer die (21) is further arranged on the outer side of the second inner die (2), the second outer die (21) and the second inner die (2) are integrally installed, and a thermal insulation plate (6) is also installed between the second outer die and the second inner die; and the injection port (5) penetrates through the second outer die (21) and the second inner die (2) and is communicated with the die cavity (3).
3. An injection molding mold for ultra-high molecular weight polyethylene according to claim 2, wherein: the outer side of the first outer die (11) is further provided with a base (7), the base (7) is further provided with a driving mechanism (8), a demolding thimble (9) is mounted on the driving mechanism (8), and the demolding thimble (9) penetrates through the first outer die (11), the thermal insulation plate (6) and the first inner die (1) to stretch into the die cavity (3).
4. An injection molding mold for ultra-high molecular weight polyethylene according to claim 1, wherein: temperature measuring holes (10) are further formed in the first inner die (1) and the second inner die (2), and the temperature measuring holes (10) extend inwards in an inclined mode from the surfaces of the two inner dies.
5. An injection molding mold for ultra-high molecular weight polyethylene according to claim 2, wherein: the end face of the die cavity (3) formed by the first inner die (1) and the second inner die (2) is also provided with a heightened stock bin part (12) matched with the die cavity (3), so that when the two inner dies displace, the die cavities (3) in the two inner dies are not opened, and the outer sides of the butt joint surfaces of the two inner dies correspondingly form a gap opening (13).
6. An injection molding mold for ultra-high molecular weight polyethylene according to claim 5, wherein: the first outer die (11) and the second outer die (21) are provided with compressed air cold runner inlets and outlets (14); an inlet and an outlet (14) of a compressed air cold runner on the first outer die (11) extend inwards to extend through the heat insulation plate (6) and the first inner die (1) to the position of the gap opening degree (13); and a compressed air cold runner inlet and outlet (14) on the second outer die (21) extends in the box, penetrates through the heat insulation plate (6) and extends into the second inner die (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122601575.7U CN216001274U (en) | 2021-10-27 | 2021-10-27 | Injection molding mold for ultra-high molecular weight polyethylene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122601575.7U CN216001274U (en) | 2021-10-27 | 2021-10-27 | Injection molding mold for ultra-high molecular weight polyethylene |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216001274U true CN216001274U (en) | 2022-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122601575.7U Active CN216001274U (en) | 2021-10-27 | 2021-10-27 | Injection molding mold for ultra-high molecular weight polyethylene |
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| Country | Link |
|---|---|
| CN (1) | CN216001274U (en) |
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2021
- 2021-10-27 CN CN202122601575.7U patent/CN216001274U/en active Active
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