CN210082360U - Extrusion die and extruder for relieving instability of plastic extrusion - Google Patents
Extrusion die and extruder for relieving instability of plastic extrusion Download PDFInfo
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- CN210082360U CN210082360U CN201920854995.6U CN201920854995U CN210082360U CN 210082360 U CN210082360 U CN 210082360U CN 201920854995 U CN201920854995 U CN 201920854995U CN 210082360 U CN210082360 U CN 210082360U
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Abstract
The utility model discloses an unstable extrusion tooling, extruder are extruded to plastics of alleviating. Wherein the extrusion die comprises: the inner wall surface of the bearing diameter of the die sleeve is provided with an annular groove; the mold core is provided with a mold core bearing diameter extending into the mold sleeve bearing diameter, and the annular groove is positioned in the range of the pipe wall of the mold core bearing diameter. The extrusion buffer zone of material is formed in the annular groove, and the material is extruded through the die orifice of the die after passing through the buffer zone, so that the influence of the material pressure in the screw and the machine head on the final extrusion effect is reduced. Particularly, under the condition of unstable glue yield, the problem of unstable glue yield can be relieved to a certain extent. Meanwhile, the flow of the material is not hindered, and the scorching of the plastic is prevented.
Description
Technical Field
The utility model relates to a cable mold's technical field is last, concretely relates to alleviate unstable extrusion tooling, extruder of plastics extrusion.
Background
The die used in the cable production mainly has three forms of extrusion, semi-extrusion and extrusion:
1. the die core of the extrusion die does not have a tubular die core bearing diameter, and the die core is contracted behind the die sleeve bearing diameter. The molten plastic is finally shaped by pressure through the die sleeve, and the extruded plastic layer has a compact structure and a smooth surface.
2. The mold core of the semi-extrusion pipe type mold has a tubular mold core bearing diameter, but the length is short. The end surface of the bearing diameter of the mold core is retracted into the end surface of the opening of the mold sleeve.
3. The die core of the tube-extruding die is provided with a tubular die core bearing diameter, and the end surface of the die core bearing diameter extends out of the end surface of the die sleeve opening or is flush with the end surface of the die sleeve opening. When the extrusion pipe type is extruded, due to the existence of the bearing diameter of the die core, the plastic is not directly pressed on the wire core, but moves forwards along the tubular outer wall of the bearing diameter of the die core, the plastic forms a tubular shape firstly, and then is stretched and then is coated on the wire core of the cable.
At present, when the extruded pipe type die is in operation, unstable conditions can occur during extrusion due to unstable factors of materials and equipment, the extrusion thickness of plastics is not uniform, and the problem of degumming during extrusion of a sheath or insulation can be caused during serious conditions, so that products are scrapped.
SUMMERY OF THE UTILITY MODEL
In order to overcome the technical defects of uneven thickness and the like when the plastic is extruded, the utility model provides an unstable extrusion die for relieving plastic extrusion.
In order to solve the above problem, the utility model discloses realize according to following technical scheme:
alleviate unstable extrusion tooling of plastics extrusion, include:
the inner wall surface of the bearing diameter of the die sleeve is provided with an annular groove;
the mold core is provided with a mold core bearing diameter extending into the mold sleeve bearing diameter, and the annular groove is positioned in the range of the pipe wall of the mold core bearing diameter.
Preferably, the annular groove is an annular V-shaped groove.
Preferably, the annular groove is an annular V-shaped groove, and specifically, a groove wall of the annular groove sequentially includes a first annular conical surface and a second annular conical surface along the plastic extrusion direction;
and the included angle between the generatrix of the first annular conical surface and the horizontal line is larger than that between the generatrix of the second annular conical surface and the horizontal line.
Preferably, the included angle between the bus of the first annular conical surface and the horizontal line is 40-50 degrees; and the included angle between the generatrix of the second annular conical surface and the horizontal line is 25-35 degrees.
Preferably, the included angle between the generatrix of the first annular conical surface and the horizontal line is 45 degrees; and the included angle between the generatrix of the second annular conical surface and the horizontal line is 30 degrees.
Preferably, the inner wall surface of the die sleeve bearing diameter and the outer wall surface of the die core bearing diameter are separated by the same distance.
Preferably, the die core bearing diameter is in a shape of a circular tube, and the inner wall surface of the die sleeve bearing diameter is matched with the die core bearing diameter.
Preferably, the die sleeve is provided with a die sleeve hole communicated with the bearing diameter of the die sleeve, and the die core is positioned in the die sleeve hole;
and the distance between the hole wall of the die sleeve hole and the outer wall of the die core is gradually reduced along the plastic extrusion direction.
The utility model also discloses an extruder, it includes foretell extrusion tooling who alleviates plastics and extrude unstability.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses an extrusion tooling sets up an annular groove through the die sleeve at the die sleeve of die sleeve on bearing the internal face in footpath. When extruding the operation, insulating plastics or sheath material flow to the ring groove of die sleeve in, because the ring groove makes the local increase in extrusion clearance, the flow rate of extruding the material slows down, has more material gathering in the ring groove, forms the buffer zone of extruding of material in the ring groove, and the material is extruded through the die orifice of mould again after the buffer zone, has alleviateed the influence of material pressure to final extrusion effect in screw rod and the aircraft nose. Particularly, under the condition of unstable glue yield, the problem of unstable glue yield can be relieved to a certain extent. Meanwhile, the flow of the material is not hindered, and the scorching of the plastic is prevented.
Drawings
The following detailed description of embodiments of the invention is provided with reference to the accompanying drawings, in which:
fig. 1 is a schematic cross-sectional structure diagram of an extrusion die of the present invention;
FIG. 2 is a schematic cross-sectional structure of the die case of the present invention;
FIG. 3 is a perspective sectional view of the die case of the present invention;
fig. 4 is another schematic cross-sectional structure of the die case of the present invention.
In the figure:
1-die sleeve, 11-die sleeve bearing diameter and 12-die sleeve hole;
2-mold core, 21-mold core bearing diameter;
3-an annular groove, 31-a first annular conical surface, 32-a second annular conical surface;
4-feeding gap, 5-extrusion gap.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
As shown in fig. 1 to fig. 3, it is a preferable structure of the extrusion die for alleviating instability of plastic extrusion according to the present invention.
As shown in fig. 1, the extrusion die is a tube extrusion die, which includes a die sleeve 1 and a die core 2. The die sleeve 1 is provided with a die sleeve hole 12 penetrating through the die sleeve, and a die orifice (i.e. an extrusion orifice) of the die sleeve 1 is called a die sleeve bearing diameter 11. The mould core 2 is provided with a mould core bearing diameter 21, which mould core bearing diameter 21 can also be called a mould nozzle. The mold core 2 passes through the mold sleeve hole 12 and is positioned in the mold sleeve hole 12, and the mold core bearing diameter 21 is positioned in the mold sleeve bearing diameter 11.
In this embodiment, the die bearing diameter 21 is a circular tube, and the inner wall surface of the die sleeve bearing diameter 11 is matched with the die bearing diameter 21, and is also a cylindrical tube wall.
As shown in fig. 1, the outer wall surface of the mold core 2 and the inner wall surface of the mold sleeve 1 are provided with a feeding gap 4 and an extrusion gap 5 which are communicated with each other; the feed gap 4 is for the extrusion of sheathing or insulating material. The extrusion gap 5 is for sizing, and the extrusion gap 5 is a gap between the outer wall surface of the die bearing diameter 21 and the inner wall surface of the die sleeve bearing diameter 11.
In the present embodiment, the feeding gap 4 is gradually reduced along the plastic extrusion direction, i.e. the distance between the hole wall of the die sleeve hole 12 and the outer wall of the die core 2 is gradually reduced along the plastic extrusion direction. This arrangement facilitates the flow of molten plastic into it.
On the other hand, the pitch of the extrusion gap 5 is the same distance, that is, the inner wall surface of the die sleeve receiving diameter 11 and the outer wall surface of the die core receiving diameter 21 are separated by the same distance. This setting can greatly avoid extruding thickness of insulating layer or restrictive coating to differ, is used for the sizing of insulating layer or restrictive coating simultaneously.
As shown in fig. 1, an inner wall surface of the die sleeve bearing diameter 11 is provided with an inward concave annular groove 3. The annular groove 3 is positioned in the pipe wall range of the die bearing diameter 21, and the outer wall surface of the die bearing diameter 21 shields the annular groove 3. I.e. the annular groove 3 is located in the extrusion gap 5.
Preferably, the annular groove 3 opens in the middle of the inner wall surface of the die case receiving diameter 11, or is provided adjacent to the entrance of the die case receiving diameter 11. To reserve a sufficient sizing area.
An annular groove 3 is formed on the inner wall surface of a die sleeve bearing diameter 11 of the die sleeve 1. The annular groove 3 will form a raised space in the extrusion gap 5 to form a buffer zone for the molten plastic to enter. The principle is as follows:
during the extrusion operation, the melted insulating plastic or sheath material flows into the annular groove 3 of the die sleeve 1 under the external force, the space of the extrusion gap 5 is locally increased due to the annular groove 3, the melted material needs to be filled in the local space, and the flowing speed of the melted material is reduced. Gradually, more molten materials are gathered in the annular groove 3, an extrusion buffer area of the molten materials is formed in the annular groove 3, the molten materials are extruded through a die orifice of the extrusion die after passing through the buffer area, and the influence of material pressure in the screw and the machine head on the final extrusion effect is reduced. Particularly, under the condition of unstable glue yield, the problem of unstable glue yield can be relieved to a certain extent. Meanwhile, the annular groove 3 does not obstruct the flow of the material, and the scorching of the plastic is prevented.
Wherein, the annular groove 3 is a V-shaped groove.
As shown in fig. 3, the groove wall of the annular groove 3 includes a first annular tapered surface 31 and a second annular tapered surface 32. The annular groove 3 is an annular V-shaped groove, and specifically, the first annular conical surface 31 and the second annular conical surface 32 of the groove wall of the annular groove 3 are distributed along the plastic extrusion direction.
An included angle between a generatrix of the first annular conical surface 31 and a horizontal line is larger than an included angle between a generatrix of the second annular conical surface 32 and the horizontal line. Through the arrangement, the first annular conical surface 31 has large inclination and large space drop, so that the buffer effect of molten plastic during entering can be improved; on the other hand, the inclination of the second annular tapered surface 32 is small, so that the extrusion of the molten plastic is facilitated, the flow of the material is not hindered, and the occurrence of plastic scorching is prevented.
Wherein, the included angle between the generatrix of the first annular conical surface 31 and the horizontal line is 40-50 degrees; the included angle between the generatrix of the second annular conical surface 32 and the horizontal line is 25-35 degrees. The two are at proper angles, so that the plastic scorching is further prevented.
In this embodiment, the included angle between the generatrix of the first annular tapered surface 31 and the horizontal line is preferably 45 °, that is, the taper of the first annular tapered surface 31 is 1: 0.5. The included angle between the generatrix of the second annular conical surface 32 and the horizontal line is 30 degrees, namely the taper of the second annular conical surface 32 is 1: 0.866.
In this embodiment, as shown in fig. 4, a joint of the first annular tapered surface and the second annular tapered surface is provided with a fillet to form a transition arc surface. The bottom of the annular groove has a certain radian, so that no dead angle is formed, and the cleaning and the flowing of the molten plastic are convenient and smooth.
The utility model also provides an extruder, it includes foretell extrusion tooling who alleviates plastics and extrude unstability. The extrusion die is a tube extrusion die. The extruder is mainly used for producing cables.
Other configurations of an extrusion die for mitigating instability in plastic extrusion are described in the present example and are described in the prior art.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made by the technical spirit of the present invention to the above embodiments do not depart from the technical solution of the present invention, and still fall within the scope of the technical solution of the present invention.
Claims (9)
1. An extrusion die for relieving instability of plastic extrusion, comprising:
the inner wall surface of the bearing diameter of the die sleeve is provided with an annular groove;
the mold core is provided with a mold core bearing diameter extending into the mold sleeve bearing diameter, and the annular groove is positioned in the range of the pipe wall of the mold core bearing diameter.
2. The extrusion die for relieving instability of plastic extrusion according to claim 1, wherein:
the annular groove is an annular V-shaped groove.
3. The extrusion die for relieving instability of plastic extrusion according to claim 1, wherein:
the groove wall of the annular groove sequentially comprises a first annular conical surface and a second annular conical surface along the plastic extrusion direction;
and the included angle between the generatrix of the first annular conical surface and the horizontal line is larger than that between the generatrix of the second annular conical surface and the horizontal line.
4. The extrusion die for relieving instability of plastic extrusion according to claim 3, wherein:
the included angle between the bus of the first annular conical surface and the horizontal line is 40-50 degrees; and the included angle between the generatrix of the second annular conical surface and the horizontal line is 25-35 degrees.
5. The extrusion die for relieving instability of plastic extrusion according to claim 4, wherein:
the included angle between the bus of the first annular conical surface and the horizontal line is 45 degrees; and the included angle between the generatrix of the second annular conical surface and the horizontal line is 30 degrees.
6. The extrusion die for relieving instability of plastic extrusion according to claim 1, wherein:
the inner wall surface of the bearing diameter of the die sleeve and the outer wall surface of the bearing diameter of the die core are separated by the same distance.
7. The extrusion die for relieving instability of plastic extrusion according to claim 1, wherein:
the bearing diameter of the mold core is in a circular tube shape, and the inner wall surface of the bearing diameter of the mold sleeve is matched with the bearing diameter of the mold core.
8. The extrusion die for relieving instability of plastic extrusion according to claim 1, wherein:
the die sleeve is provided with a die sleeve hole communicated with the bearing diameter of the die sleeve, and the die core is positioned in the die sleeve hole;
and the distance between the hole wall of the die sleeve hole and the outer wall of the die core is gradually reduced along the plastic extrusion direction.
9. An extruder comprising the extrusion die for alleviating instability of extrusion of plastics according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920854995.6U CN210082360U (en) | 2019-06-06 | 2019-06-06 | Extrusion die and extruder for relieving instability of plastic extrusion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920854995.6U CN210082360U (en) | 2019-06-06 | 2019-06-06 | Extrusion die and extruder for relieving instability of plastic extrusion |
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| CN210082360U true CN210082360U (en) | 2020-02-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115782031A (en) * | 2023-02-09 | 2023-03-14 | 浙江建华集团盛太塑料有限公司 | Pearl cotton production equipment and process |
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2019
- 2019-06-06 CN CN201920854995.6U patent/CN210082360U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115782031A (en) * | 2023-02-09 | 2023-03-14 | 浙江建华集团盛太塑料有限公司 | Pearl cotton production equipment and process |
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