CN210233937U - Gas-assisted thin-wall small-section pipe extrusion molding die - Google Patents
Gas-assisted thin-wall small-section pipe extrusion molding die Download PDFInfo
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- CN210233937U CN210233937U CN201920759010.1U CN201920759010U CN210233937U CN 210233937 U CN210233937 U CN 210233937U CN 201920759010 U CN201920759010 U CN 201920759010U CN 210233937 U CN210233937 U CN 210233937U
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Abstract
The utility model relates to a gaseous supplementary thin wall small cross-section tubular product extrusion moulding mould. In-process of production tubular product of drag reduction principle is assisted to gas in application, before requiring tubular product not to be extruded the bush, the gas pressure value between mould wall and the tubular product wall will be high enough to form stable air cushion and subtract the resistance layer, behind the tubular product extruded the bush, only allow the inside atmospheric pressure value of tubular product to be a little more than atmospheric pressure value again, in order to avoid tubular product by the inflation or even blown through, the size of these two required atmospheric pressure values differs 3 ~ 5 orders of magnitude, traditional mould can't satisfy. The utility model relates to a gaseous supplementary thin wall small cross-section tubular product extrusion moulding mould, wherein: the machine head body is connected with an external extruder through threads, the sprue spreader, the outer opening die I and the die pressing ring are sequentially arranged in an inner hole of the machine head body from left to right, the sprue spreader is matched and connected with the inner hole of the machine head body through the outer cylindrical surface of the sprue spreader, two independent gas channels are formed in the sprue spreader, and a gas channel connecting thread is processed on the outer opening die I and used for being connected with a gas source to form an outer gas auxiliary gas cushion layer.
Description
Technical Field
The utility model belongs to high polymer extrusion moulding processing field, concretely relates to extrusion process, the inside and outside double-deck supplementary extrusion moulding mould of double-deck gas of the controllable inside atmospheric pressure of tubular product.
Background
Extrusion molding is one of the most basic molding methods for polymer processing, and is also a molding method for high polymers, in which the specific gravity of the product yield is the largest. Because the resistance of the die on the melt extrusion, the traditional extrusion molding has the problems of product quality and production efficiency influenced by extrusion swelling, shark skin on the surface of a product, melt fracture and the like. When the high polymer is extruded, the gas is used to form a gas cushion layer between the neck mold and the melt, so that the friction reduction and the resistance reduction are realized.
In-process of production tubular product of drag reduction principle is assisted to gas in application, before requiring tubular product not to be extruded the bush, the air cushion layer gas pressure between mould wall and the tubular product wall will be high enough to form stable air cushion and subtract the layer of hindering, tubular product is extruded behind the bush, only allows the inside atmospheric pressure of tubular product a little more than atmospheric pressure again, in order to avoid tubular product by the inflation or even by the blow-through, the size of these two required atmospheric pressure values differs 3 ~ 5 orders of magnitude, traditional mould can't satisfy.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
An object of the utility model is to provide a gaseous supplementary thin wall small cross section tubular product extrusion moulding mould satisfies thin wall small cross section tubular product and is extruded the bush after, its inside atmospheric pressure can be followed from being higher than atmospheric pressure several kilopascals rapidly and reduced to the level that is only a little more than atmospheric pressure.
(II) technical scheme
The technical scheme of the utility model: a gas-assisted thin-wall small-section pipe extrusion molding die comprises a machine head body, an inner gas-assisted gas inlet joint, a splitter cone, an outer opening die I, an opening die pressing ring, a core rod I, an outer gas-assisted gas inlet joint, an outer opening die II, a core rod II and an inner gas-assisted gas outlet joint; wherein: the machine head body is connected with an external extruder through threads, the sprue spreader, the first outer opening die and the first die pressing ring are sequentially arranged in an inner hole of the machine head body from left to right, the die pressing ring is connected and fastened with the machine head body through screws, the first outer opening die is provided with a threaded hole for connecting an air tap, the second outer opening die and the first outer opening die are positioned at the inner outer cylindrical surface and connected through screws, the sprue spreader is connected with the inner hole of the machine head body in a matched manner through the outer cylindrical surface of the sprue spreader, two independent gas channels are arranged in the sprue spreader, the end parts of the gas channels are provided with threaded interfaces, an inner gas auxiliary gas inlet connector and an inner gas auxiliary gas outlet connector are connected to the threaded interface of the gas channel on the sprue spreader through holes in the machine head body, the first core rod is sleeved in the middle part of the sprue spreader through threads and keeps a certain gap with the sprue spreader to form a gas channel, and the cylindrical positioning surface of the outer opening die II is matched with the inner hole of the outer opening die I, and a gas flow passage connecting thread is processed on the outer opening die I and is used for connecting a gas source to form an outer gas auxiliary gas cushion layer.
A gas-assisted thin-wall small-section pipe extrusion molding die, wherein: the shunting cone is integral, two independent gas flow channels are arranged in the shunting cone, and a threaded connector connected with an air tap is designed at one end of each channel.
A gas-assisted thin-wall small-section pipe extrusion molding die, wherein: the core rod is divided into two parts, namely a first core rod and a second core rod, and the two parts of the core rod are respectively connected with the shunting cone through threads and are installed and fixed on the shunting cone to form the complete extrusion opening die core rod.
A gas-assisted thin-wall small-section pipe extrusion molding die, wherein: and a gap is reserved between the first core rod and the shunting cone, and the gap between the first core rod and the shunting cone and an air passage on the shunting cone form a complete internal auxiliary air flow inlet channel after assembly.
A gas-assisted thin-wall small-section pipe extrusion molding die, wherein: the gas backflow channel is designed in the flow distribution cone, most of the gas in the inner gas auxiliary layer is pumped away by the air pump through the gas return channel after flowing out of the neck mold, and the gas does not naturally flow out of the tube through the port of the tube, so that the tube is prevented from being blown by the gas accumulated in the tube after being extruded out of the neck mold, and even blown.
A gas-assisted thin-wall small-section pipe extrusion molding die, wherein: the first outer mouth die and the second outer mouth die are assembled into a mouth die whole, the first core rod, the second core rod and the spreader cone are assembled into a core rod whole, the coaxiality between the mouth die whole and the core rod whole is ensured by the machining and assembling precision between the mouth die whole and the core rod whole and a machine head body, and the gap or the coaxiality between the mouth die whole and the core rod whole is not adjusted by a traditional adjusting screw mode.
(III) advantageous effects
The utility model has the advantages that: compared with the prior art, the beneficial effects of the utility model include: by utilizing the designed complete gas inlet and outlet flow channel and adjusting the gas flow and pressure at the two positions of the gas inlet nozzle and the gas outlet nozzle, the requirement that the gas pressure in the pipe is quickly reduced from a high gas pressure value required by forming a stable gas cushion layer in the neck mold to a low gas pressure value required by not blowing the pipe outside the neck mold after the pipe is extruded out of the neck mold can be met, and the problem that the gas pressure value of the inner layer is set when the inner layer and the outer layer are extruded in an auxiliary manner is solved; meanwhile, a die adjusting screw in the conventional technology is abandoned, the inner and outer cylindrical surfaces are directly positioned, the coaxiality between the die and the core rod is ensured by depending on the machining and assembling precision, and the requirement on the uniformity of the wall thickness of the tube during extrusion processing of the thin-wall tube is met.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further explained with reference to the drawings.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Reference numerals: the gas nozzle comprises a machine head body 1, an inner gas auxiliary gas inlet joint 2, a spreader cone 3, an outer die I4, a die pressing ring 5, a core rod I6, an outer gas auxiliary gas inlet joint 7, an outer die II 8, a core rod II 9 and an inner gas auxiliary gas outlet joint 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Embodiment 1, please refer to fig. 1, a gas-assisted thin-wall small-section pipe extrusion molding die comprises a machine head body 1, an inner gas-assisted gas inlet joint 2, a splitter cone 3, an outer die I4, a die pressing ring 5, a core rod I6, an outer gas-assisted gas inlet joint 7, an outer die II 8, a core rod II 9, and an inner gas-assisted gas outlet joint 10; wherein: the machine head body 1 is connected with an external extruder through threads, the sprue spreader 3, the outer die I4 and the die pressing ring 5 are sequentially installed in an inner hole of the machine head body 1 from left to right, the die pressing ring 5 and the machine head body 1 are connected and fastened through screws, the outer die I4 is provided with a thread opening connected with an air faucet, the inner and outer cylindrical surfaces between the outer die II 8 and the outer die I4 are positioned and connected through screws, the sprue spreader 3 is connected with the inner hole of the machine head body 1 through the outer cylindrical surface in a matched mode, two independent gas channels are formed in the sprue spreader, the end portion of each gas channel is provided with a thread interface, the inner gas auxiliary air inlet connector 2 and the inner gas auxiliary air outlet connector 10 penetrate through holes in the machine head body 1 and are connected to the thread interface of the gas channel on the sprue spreader 3, and the core rod I6 is sleeved in the middle. The outer opening die I4 is connected with the inner hole of the machine head body 1 in a matched mode through the outer cylindrical surface of the outer opening die I, the outer opening die II 8 is connected with the outer opening die I4 through screws, the cylindrical positioning surface of the outer opening die II 8 is matched with the inner hole of the outer opening die I4, and the outer opening die I4 is provided with gas flow passage connecting threads for being connected with a gas source to form an outer gas auxiliary gas cushion layer.
Embodiment 2, please refer to fig. 1, a gas-assisted thin-wall small-section pipe extrusion molding die, wherein: the flow distribution cone 3 is of an integral type, two independent gas flow channels are arranged in the flow distribution cone 3, and a threaded connector connected with an air tap is designed at one end of each channel. The rest is the same as example 1.
Embodiment 3, please refer to fig. 1, a gas-assisted thin-wall small-section pipe extrusion molding die, wherein: the core rod is divided into two parts, namely a first core rod 6 and a second core rod 9, and the two parts of the core rod are respectively connected with the shunting cone 3 through threads and are installed and fixed on the shunting cone 3 to form the complete extrusion orifice die core rod. The rest is the same as example 1.
Embodiment 4, please refer to fig. 1, a gas-assisted thin-wall small-section pipe extrusion molding die, wherein: a gap is reserved between the first core rod 6 and the spreader cone 3, and the gap between the first core rod 6 and the spreader cone 3 and an air passage on the spreader cone 3 form a complete internal auxiliary air flow inlet channel. The rest is the same as example 1.
Embodiment 6, please refer to fig. 1, a gas-assisted thin-walled small-section pipe extrusion molding die, wherein: the first outer mouth die 4 and the second outer mouth die 8 are assembled into a mouth die whole, the first core rod 6, the second core rod 9 and the spreader cone 3 are assembled into a core rod whole, the coaxiality between the mouth die whole and the core rod whole is ensured by the machining and assembling precision between the mouth die whole and the core rod whole and the machine head body 1, and the gap or the coaxiality between the mouth die whole and the core rod whole is not adjusted by a traditional adjusting screw mode. The rest is the same as example 1.
The working principle is as follows:
when the gas-assisted extrusion pipe processing is carried out, a high polymer melt flows in from an inlet A at the left end of the die, flows out from an outlet B at the right end of the die through flow channel splitting, compression and sizing, and is cooled to form a finished pipe through sizing, an outer gas-assisted layer gas flows in from an inlet C of the gas nozzle 7, enters between the polymer melt and the inner hole wall surface of the outer opening die II 8 through a gap between the outer opening die I4 and the outer opening die II 8, so that a gas cushion resistance reducing layer between the outer wall of the pipe and the opening die is formed, and finally the outlet die is dissipated into the atmosphere. The gas in the inner gas auxiliary layer flows in from the D inlet of the gas nozzle 2, flows through a flow passage in the core rod and a gap between the diffluent cone 3 and the core rod I6, enters between the polymer melt and the outer wall of the core rod II 9, forms an air cushion resistance reducing layer between the inner wall of the pipe and the core rod, after the gas in the inner gas auxiliary layer flows out of the neck mold, under the condition that the gas nozzle 10 is externally connected with an air pump, the gas enters the gas passage in the diffluent cone 3 from the gas hole at the rightmost end of the diffluent cone 3, finally flows out from the E outlet of the gas nozzle 10, and is dissipated to the atmosphere after passing through the air pump, so that the defect that when the traditional gas auxiliary extrusion neck mold is used, the gas cannot be discharged from the port of the pipe in.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A gas-assisted thin-wall small-section pipe extrusion molding die comprises a machine head body (1), an inner gas-assisted gas inlet joint (2), a spreader cone (3), an outer opening die I (4), a die pressing ring (5), a core rod I (6), an outer gas-assisted gas inlet joint (7), an outer opening die II (8), a core rod II (9) and an inner gas-assisted gas outlet joint (10); the method is characterized in that: the machine head body (1) is connected with an external extruder through threads, the sprue spreader (3), the outer opening die I (4) and the opening die pressing ring (5) are sequentially installed in an inner hole of the machine head body (1) from left to right, the opening die pressing ring (5) is connected and fastened with the machine head body (1) through screws, the outer opening die I (4) is provided with a threaded hole connected with an air faucet, the inner cylindrical surface and the outer cylindrical surface between the outer opening die II (8) and the outer opening die I (4) are positioned and connected through screws, the sprue spreader (3) is connected with the inner hole of the machine head body (1) in a matching way through the outer cylindrical surface, two independent gas channels are arranged in the sprue spreader, the end part of each gas channel is provided with a threaded interface, the inner gas auxiliary gas inlet connector (2) and the inner gas auxiliary gas outlet connector (10) penetrate through holes in the machine head body (1) and are connected to the threaded interfaces of the gas channels, and a certain clearance is reserved between the outer opening die and the outer opening die to form an air flow channel, the first outer opening die (4) is connected with the inner hole of the machine head body (1) in a matched manner through the outer cylindrical surface of the first outer opening die, the second outer opening die (8) is connected with the first outer opening die (4) through a screw, the cylindrical positioning surface of the second outer opening die (8) is matched with the inner hole of the first outer opening die (4), and the first outer opening die (4) is provided with an air flow channel connecting thread for connecting an air source to form an outer air auxiliary air cushion layer.
2. The gas-assisted thin-wall small-section pipe extrusion molding die of claim 1, characterized in that: the flow distribution cone (3) is of an integral type, two independent gas flow channels are arranged in the flow distribution cone (3), and a threaded connector connected with an air tap is designed at one end of each channel.
3. The gas-assisted thin-wall small-section pipe extrusion molding die of claim 1, characterized in that: the core rod is divided into two parts, namely a first core rod (6) and a second core rod (9), and the two parts of the core rod are respectively connected with the shunting cone (3) through threads and are installed and fixed on the shunting cone (3) to form the complete extrusion opening die core rod.
4. The gas-assisted thin-wall small-section pipe extrusion molding die of claim 1, characterized in that: a gap is reserved between the first core rod (6) and the flow distribution cone (3), and the gap between the first core rod and the flow distribution cone and an air passage on the flow distribution cone (3) form a complete internal auxiliary air flow inlet channel after assembly.
5. The gas-assisted thin-wall small-section pipe extrusion molding die of claim 1, characterized in that: the gas backflow channel is designed in the flow distribution cone (3), most of the gas in the inner gas auxiliary layer is pumped away by the air pump through the gas return channel after flowing out of the die, and the gas does not naturally flow out of the tube through the port of the tube, so that the tube is prevented from being blown by the gas accumulated in the tube and even blown through the tube after being extruded out of the die.
6. The gas-assisted thin-wall small-section pipe extrusion molding die of claim 1, characterized in that: the first outer opening die (4) and the second outer opening die (8) are assembled into a die whole, the first core rod (6), the second core rod (9) and the spreader cone (3) are assembled into a core rod whole, the coaxiality between the die whole and the core rod whole is ensured by the machining and assembling precision between the die whole and the core rod whole and a machine head body, and the gap or the coaxiality between the die whole and the core rod whole is not adjusted by a traditional adjusting screw mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920759010.1U CN210233937U (en) | 2019-05-24 | 2019-05-24 | Gas-assisted thin-wall small-section pipe extrusion molding die |
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| CN201920759010.1U CN210233937U (en) | 2019-05-24 | 2019-05-24 | Gas-assisted thin-wall small-section pipe extrusion molding die |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110154357A (en) * | 2019-05-24 | 2019-08-23 | 南昌大学 | A kind of gas auxiliary thin-walled small bore tube extrusion molding die |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110154357A (en) * | 2019-05-24 | 2019-08-23 | 南昌大学 | A kind of gas auxiliary thin-walled small bore tube extrusion molding die |
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