CN114939963A - Flash-free exhaust device and exhaust method for high polymer product - Google Patents
Flash-free exhaust device and exhaust method for high polymer product Download PDFInfo
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- CN114939963A CN114939963A CN202210509121.3A CN202210509121A CN114939963A CN 114939963 A CN114939963 A CN 114939963A CN 202210509121 A CN202210509121 A CN 202210509121A CN 114939963 A CN114939963 A CN 114939963A
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- shaft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/34—Moulds having venting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2669—Moulds with means for removing excess material, e.g. with overflow cavities
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2673—Moulds with exchangeable mould parts, e.g. cassette moulds
- B29C45/2675—Mounting of exchangeable mould inserts
Abstract
A flash-free exhaust device and an exhaust method for a high polymer product comprise a breathable mold jacket and a support shaft, wherein the outer side of the breathable mold jacket is embedded in a high polymer material, and the upper end of the support shaft is embedded in the inner side of the breathable mold jacket; the outside of back shaft upper end and the inboard laminating of ventilative mould overcoat, ventilative mould overcoat is made by ventilative material, and the surface of back shaft upper end is opened there is the guiding gutter, and when macromolecular material carried out the thermochemical reaction, gas in the macromolecular material can pass ventilative mould overcoat and enter into the guiding gutter to discharge along the guiding gutter. The invention can ensure the exhaust effect without causing flash, can realize that the product is directly taken out after the mold is opened, has no appearance damage, and improves the qualification rate of the product.
Description
Technical Field
The invention relates to a high polymer product, in particular to a high polymer material capsule product without flash.
Background
The structure of the high polymer material capsule product is formed by alternately compounding a plurality of layers of metal pieces and high polymer materials, and the product has a capsule cavity structure in the axial direction and has the characteristics of large depth, large curvature and high requirement on apparent mass. When the capsule structure is formed, air holes and flash can be formed on the surface of the capsule due to the fact that high polymer materials are gathered and air is easy to nest. After the high molecular reaction in the mould without the air exhaust hole, the surface of the capsule structure of the product is easy to generate bubbles. After the vent hole is formed in the air pocket position, the appearance quality defect can be caused by the flash of the residual materials in the vent hole, the flash removal is long in time consumption and difficult to clean, and the product is extremely easy to damage when the flash is removed. Therefore, the exhaust scheme of realizing smooth appearance of the capsule without exhaust hole flash becomes a technical difficulty.
Moreover, because the cost of the air-permeable mould jacket made of air-permeable steel is very high, the invention uses the common metal material to make the supporting shaft to support the air-permeable mould jacket and limit the position of the air-permeable mould jacket, thereby greatly reducing the manufacturing cost of the whole mould. However, the fit degree between the support shaft and the air-permeable mold jacket is not high, so that the air-permeable mold jacket is easy to generate small displacement or deflection in a working state, and the shape and quality of a product are affected. However, the degree of fit between the support shaft and the air-permeable mold outer sleeve is too high, and air is easily trapped between the support shaft and the air-permeable mold outer sleeve, so that the air is accumulated between the support shaft and the air-permeable mold outer sleeve, the vibration of the air-permeable mold outer sleeve can be caused, and the shape and the quality of a product are also influenced. Therefore, how to make the breathable mold sleeve in a working state and position stability needs further research.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the flash-free exhaust scheme of the high polymer material capsule product is adopted, so that flash without exhaust holes and no air pocket defect are realized, and the apparent quality, the qualified rate and the production efficiency of the product are improved.
In order to solve the problems, the technical scheme provided by the invention is as follows: a flash-free exhaust device for a polymer product comprises a breathable die outer sleeve and a support shaft, wherein the outer side of the breathable die outer sleeve is embedded in a polymer material, and the upper end of the support shaft is embedded in the inner side of the breathable die outer sleeve; the outside of back shaft upper end and the inboard laminating of ventilative mould overcoat, ventilative mould overcoat is made by ventilative material, and the surface of back shaft upper end is opened has the guiding gutter, and when macromolecular material carried out the thermochemical reaction, gas in the macromolecular material can pass ventilative mould overcoat and enter into the guiding gutter to discharge along the guiding gutter.
Preferably, the mould further comprises a mould outer frame, a cavity is formed in the mould outer frame, and the high polymer material, the breathable mould outer sleeve and the supporting shaft are arranged in the cavity.
Preferably, the air-permeable mold outer sleeve is a rotating body and comprises a spherical shell and a shell, the spherical shell is arranged at the upper end of the shell and is in seamless connection with the shell, the spherical shell is hollow and hemispherical, and the shell is hollow and circular truncated cone-shaped; the outer diameter of the upper end of the shell is larger than that of the lower end of the spherical shell, an annular shell upper end face is formed at the upper end of the shell, and an annular shell lower end face is arranged at the lower end of the shell.
Preferably, the supporting shaft is a rotating body and comprises a shaft head and a shaft body, the shaft head is arranged at the upper end of the shaft body and is in seamless connection with the shaft body, the shaft head is hemispherical, and the shaft body is in a circular truncated cone shape; the outer diameter of the upper end of the shaft body is larger than that of the lower end of the shaft head, an annular shaft upper end surface is formed at the upper end of the shaft body, and a through shaft hole is formed in the axial direction of the supporting shaft; when the high polymer material is subjected to thermochemical reaction, gas in the high polymer material can penetrate through the outer sleeve of the air-permeable mold and can be discharged from the shaft hole.
Preferably, the guiding gutter includes ring channel and side arc groove, and the ring channel is for opening the recess in the circumference direction of spindle nose surface, and the side arc groove is for opening the recess in the generating line direction of spindle nose surface, and side arc groove and ring channel cross distribution, and the upper end of side arc groove links to each other with the shaft hole.
Preferably, when the upper end of the supporting shaft is attached to the inner side of the air-permeable mold jacket, a gap exists between the lower end face of the shell at the lower end of the shell of the air-permeable mold jacket and the upper end face of the shaft at the upper end of the shaft body of the supporting shaft; when the high polymer material is subjected to a thermochemical reaction, gas in the high polymer material passes through the outer sleeve of the breathable mold, enters the diversion trench and is discharged along the gap.
A flash-free exhaust method for high-molecular products is characterized in that a breathable mold jacket is arranged between a high-molecular material and a support shaft, and a diversion trench is formed in the outer surface of the support shaft, so that gas in the high-molecular material can penetrate through the breathable mold jacket to enter the diversion trench and be exhausted along the diversion trench during a thermochemical reaction of the high-molecular material.
Preferably, the mold comprises a mold outer frame, a cavity is formed in the mold outer frame, and the high polymer material, the breathable mold outer sleeve and the support shaft are arranged in the cavity; the cavity shapes the high polymer material in a thermochemical reaction state and enables the high polymer material to be in a semi-closed state, so that gas generated in the thermochemical reaction of the high polymer material is restrained from entering the flow guide groove from the outer sleeve of the breathable mold.
Preferably, the diversion trench comprises an annular trench and a side arc trench, the annular trench is formed in the circumferential direction of the outer surface of the shaft head, and the arc side arc trench is formed in the generatrix direction of the outer surface of the shaft head, so that the side arc trench and the annular trench are distributed in a crossed manner; when the upper end of the supporting shaft is attached to the inner side of the air-permeable mold outer sleeve, a gap exists between the lower end surface of the shell at the lower end of the shell of the air-permeable mold outer sleeve and the upper end surface of the shaft at the upper end of the shaft body of the supporting shaft; therefore, after entering the diversion trench from the outer sleeve of the air-permeable mold, the air-permeable mold can flow downwards to the gap along the annular groove and the side arc groove which are distributed in a crossed manner and is discharged from the gap.
Preferably, the support shaft is a rotating body, a through shaft hole is formed along the axial direction of the support shaft, and the upper end of the side arc groove is connected with the shaft hole; when the high polymer material is subjected to thermochemical reaction, gas in the high polymer material can pass through the outer sleeve of the air-permeable mold and can be discharged from the shaft hole.
The beneficial technical effects of the invention are as follows:
1. the mold core at the molded surface of the capsule structure consists of a breathable mold steel outer sleeve and a perforated support shaft, so that the exhaust effect can be ensured, and flash cannot be caused.
2. The steel jacket of the breathable die can be quickly replaced when being blocked in use.
3. Compared with the traditional mold structure, the invention can realize that the product is directly taken out after the mold is opened in the production practice, the product has no appearance damage, and the qualification rate of the product is improved. The post-processing of the capsule structure of the product is not needed, so that the labor intensity of the operation is greatly reduced, and the production efficiency of the product is improved.
4. Considering that the requirement on the apparent quality of the inner surface of the capsule body is high, the surface of the mold core is not provided with holes, and the flash formation is continuously and smoothly prevented. Aiming at the problem that gas is not easy to escape to cause bubbles when high polymer materials are injected, the problem of exhaust is solved by adopting a breathable die steel material.
5. To ventilative mould steel existence jam problem, use overcoat and dabber profile complex equipment mode, can carry out quick replacement, set up the exhaust hole on the dabber simultaneously and ensure the exhaust effect.
Drawings
FIG. 1 is a schematic overall structure diagram according to a first embodiment;
FIG. 2 is a schematic view of a support shaft according to an embodiment;
FIG. 3 is a schematic view of the structure of the outer cover of the venting mold in accordance with one embodiment;
FIG. 4 is a schematic structural view of a support shaft in the first comparative example;
FIG. 5 is a schematic structural view of a support shaft in a comparative example;
in the figure: the mold comprises a high polymer material 1, an air-permeable mold outer sleeve 2, a spherical shell 21, a shell 22, a shell upper end surface 221, a shell lower end surface 222, a support shaft 3, a shaft hole 31, an annular groove 321, a shaft head 32, a side arc groove 322, a shaft body 33, an upper end surface 331, a mold outer frame 4, an overflow channel 5 and an iron piece 6.
Detailed Description
The invention is further described with reference to the following examples and figures:
example one
In the former exhaust mould, bubbles are easy to appear on the surface of a product with a bag body structure in the cooling process, after an exhaust hole is formed in an air-pocket position, the appearance quality defect can be caused by excess material burrs in the exhaust hole, the burr removal is long in time consumption and difficult to clean, and the product is extremely easy to damage when the burrs are removed. The main reason for the generation of flash is that the gas discharge speed of the product is high in the cooling process, so that bubbles and flash are easy to occur. The air-permeable mold jacket 2 arranged in the embodiment is made of air-permeable steel, and the inside of the air-permeable steel is formed by connecting fine small holes, so that air can smoothly and slowly permeate and penetrate through the air-permeable mold jacket. Therefore, the gas in the polymer material 1 can be discharged slowly, and therefore, bubbles and burrs are not generated.
As shown in fig. 1, the exhaust apparatus includes a mold outer frame 4, an air-permeable mold outer cover 2, and a support shaft 3. The mold outer frame 4 is provided with a cavity, the cavity is provided with the air-permeable mold outer sleeve 2 and the support shaft 3, and the mold outer frame 4 is provided with a through injection hole which is not shown in the figure. The high polymer material 1 at high temperature is fluid and can be injected into the cavity of the outer mold frame 4 from the injection hole, and the redundant high polymer material 1 can overflow from the overflow channel 5 at the upper end of the outer mold frame 4. The high-temperature polymer material 1 contains gas, and the gas in the polymer material 1 is discharged during the cooling process of the polymer material 1. The air-permeable mold jacket 2 is arranged between the high polymer material 1 and the supporting shaft 3, the outer surface of the upper end of the supporting shaft 3 is provided with a diversion trench, and when the high polymer material 1 is subjected to thermochemical reaction, gas in the high polymer material 1 can penetrate through the air-permeable mold jacket 2 to enter the diversion trench and be discharged along the diversion trench.
As shown in fig. 1, 2 and 3, the outer side of the air-permeable mold jacket 2 is embedded in the polymer material 1, the polymer material 1 is further embedded with an iron piece 6, the iron piece 6 is used for changing the rigidity of the polymer product, and the upper end of the support shaft 3 is embedded in the inner side of the air-permeable mold jacket 2. The outer side of the upper end of the support shaft 3 is attached to the inner side of the air-permeable mold jacket 2, and the air-permeable mold jacket 2 is made of air-permeable materials. Preferably, the gas-permeable mould jacket 2 is made of gas-permeable steel. Ventilative mould overcoat 2 is the rotator, and ventilative mould overcoat 2 includes spherical shell 21 and casing 22, and spherical shell 21 sets up the upper end at casing 22, and spherical shell 21 and casing 22 seamless connection, and spherical shell 21 is hollow hemispherical, and casing 22 is hollow round platform form. The outer diameter of the upper end of the casing 22 is larger than that of the lower end of the spherical shell 21, an annular casing upper end surface 221 is formed at the upper end of the casing 22, and an annular casing lower end surface 222 is formed at the lower end of the casing 22.
The supporting shaft 3 is a rotating body, the supporting shaft 3 comprises a shaft head 32 and a shaft body 33, the shaft head 32 is arranged at the upper end of the shaft body 33, the shaft head 32 is in seamless connection with the shaft body 33, the shaft head 32 is hemispherical, and the shaft body 33 is in a circular truncated cone shape. The outer diameter of the upper end of the shaft body 33 is larger than that of the lower end of the spindle head 32, and an annular shaft upper end surface 331 is formed at the upper end of the shaft body 33 and a through shaft hole 31 is formed along the axial direction of the support shaft 3. When the polymer material 1 is subjected to a thermochemical reaction, the gas in the polymer material 1 can pass through the air-permeable mold jacket 2 and can be discharged from the shaft hole 31.
The outer surface of the shaft head 32 at the upper end of the support shaft 3 is provided with a flow guide groove, the flow guide groove comprises an annular groove 321 and a side arc groove 322, the annular groove 321 is a groove which is arranged in the circumferential direction of the outer surface of the shaft head 32, and the side arc groove 322 is a groove which is arranged in the generatrix direction of the outer surface of the shaft head 32. The side arc grooves 322 are distributed across the annular groove 321, and the upper ends of the side arc grooves 322 are connected with the shaft hole 31. When the upper end of the support shaft 3 is attached to the inside of the air-permeable mold jacket 2, a gap is left between the lower end surface 222 of the casing 22 of the air-permeable mold jacket 2 and the upper end surface 331 of the shaft body 33 of the support shaft 3. When the polymer material 1 is subjected to a thermochemical reaction, after the gas in the polymer material 1 passes through the gas-permeable mold jacket 2 and enters the guide grooves, the gas in the annular groove 321 can enter the side arc groove 322 along the annular groove 321. When the gas flows down along the side arc grooves 322, the gas flows to the gap between the upper end surfaces 331 of the shaft bodies 33 of the support shafts 3 and is discharged along the gap. When the gas flows upwards along the side arc grooves 322, the gas flows to the shaft hole 31 and is discharged from the shaft hole 31.
Comparative example 1
As shown in fig. 4, the present comparative example is different from the first example in that the guide grooves formed on the outer surface of the stub shaft 32 have only the annular groove 321 and no side arc groove 322. After the gas penetrates through the air-permeable mold jacket 2, the gas is still easily blocked between the shaft head 32 and the air-permeable mold jacket 2, and the exhaust effect is poor.
Comparative example No. two
As shown in fig. 5, the present comparative example is different from the first example in that the guide grooves formed on the outer surface of the stub shaft 32 have only the side arc grooves 322 without the annular groove 321. After the gas permeates through the gas permeable mold jacket 2, part of the gas can flow along the side arc grooves 322 to the gap between the upper end surfaces 331 of the shaft bodies 33 of the support shafts 3 and be discharged along the gap. Or part of gas can flow to the shaft hole 31 along the side arc groove 322 and is discharged from the shaft hole 31, and the exhaust effect is good.
It will be apparent that modifications and variations are possible without departing from the principles of the invention as set forth herein.
Claims (10)
1. A flash-free exhaust device for a polymer product is characterized by comprising a breathable mold jacket and a support shaft, wherein the outer side of the breathable mold jacket is embedded in a polymer material, and the upper end of the support shaft is embedded in the inner side of the breathable mold jacket; the outside of back shaft upper end and the inboard laminating of ventilative mould overcoat, ventilative mould overcoat is made by ventilative material, and the surface of back shaft upper end is opened has the guiding gutter, and when macromolecular material carried out the thermochemical reaction, gas in the macromolecular material can pass ventilative mould overcoat and enter into the guiding gutter to discharge along the guiding gutter.
2. The flashing-free exhaust apparatus for polymeric products of claim 1 further comprising a mold housing having a cavity therein, wherein the polymeric material, the gas-permeable mold housing, and the support shaft are disposed in the cavity.
3. The flash-free exhaust device for the polymer product according to claim 2, wherein the air-permeable mold jacket is a rotating body, the air-permeable mold jacket comprises a spherical shell and a shell, the spherical shell is arranged at the upper end of the shell and is seamlessly connected with the shell, the spherical shell is hollow and hemispherical, and the shell is hollow and truncated cone-shaped; the outer diameter of the upper end of the shell is larger than that of the lower end of the spherical shell, an annular shell upper end face is formed at the upper end of the shell, and an annular shell lower end face is arranged at the lower end of the shell.
4. The flash-free exhaust device for the polymer product according to claim 3, wherein the support shaft is a rotating body, the support shaft comprises a shaft head and a shaft body, the shaft head is arranged at the upper end of the shaft body, the shaft head is seamlessly connected with the shaft body, the shaft head is hemispherical, and the shaft body is in a circular truncated cone shape; the outer diameter of the upper end of the shaft body is larger than that of the lower end of the shaft head, an annular shaft upper end surface is formed at the upper end of the shaft body, and a through shaft hole is formed in the axial direction of the supporting shaft; when the high polymer material is subjected to thermochemical reaction, gas in the high polymer material can penetrate through the outer sleeve of the air-permeable mold and can be discharged from the shaft hole.
5. The flashing-free exhaust device of the high polymer product as claimed in claim 4, wherein the diversion trench comprises an annular trench and a side arc trench, the annular trench is a trench opened in the circumferential direction of the outer surface of the spindle nose, the side arc trench is a trench opened in the generatrix direction of the outer surface of the spindle nose, the side arc trench and the annular trench are distributed in a crossed manner, and the upper end of the side arc trench is connected with the shaft hole.
6. The flash-free exhaust device for polymer products as claimed in claim 5, wherein when the upper end of the support shaft is attached to the inner side of the air-permeable mold jacket, a gap is formed between the lower end surface of the shell at the lower end of the shell of the air-permeable mold jacket and the upper end surface of the shaft at the upper end of the shaft body of the support shaft; when the high polymer material is subjected to a thermochemical reaction, gas in the high polymer material passes through the outer sleeve of the breathable mold, enters the diversion trench and is discharged along the gap.
7. A flash-free exhaust method for a high polymer product is characterized in that a breathable mold outer sleeve is arranged between a high polymer material and a support shaft, and a diversion trench is formed in the outer surface of the support shaft, so that gas in the high polymer material can penetrate through the breathable mold outer sleeve to enter the diversion trench and is exhausted along the diversion trench during a thermochemical reaction of the high polymer material.
8. The flash-free degassing method for polymer products according to claim 7, comprising forming a cavity in the mold housing, and disposing the polymer material, the gas-permeable mold housing and the support shaft in the cavity; the cavity shapes the high polymer material in a thermochemical reaction state and enables the high polymer material to be in a semi-closed state, so that gas generated in the thermochemical reaction of the high polymer material is restrained from entering the flow guide groove from the outer sleeve of the breathable mold.
9. The flash-free exhausting method of a polymer product according to claim 8, wherein the diversion trench comprises an annular trench and a side arc trench, the annular trench is formed in the circumferential direction of the outer surface of the spindle nose, and the arc side arc trench is formed in the generatrix direction of the outer surface of the spindle nose, so that the side arc trench and the annular trench are distributed in a crossed manner; when the upper end of the supporting shaft is attached to the inner side of the air-permeable mold outer sleeve, a gap exists between the lower end surface of the shell at the lower end of the shell of the air-permeable mold outer sleeve and the upper end surface of the shaft at the upper end of the shaft body of the supporting shaft; therefore, after entering the diversion trench from the outer sleeve of the air-permeable mold, the air-permeable mold can flow downwards to the gap along the annular groove and the side arc groove which are distributed in a crossed manner and is discharged from the gap.
10. The flash-free exhausting method of a polymer product according to claim 9, wherein the supporting shaft is a rotating body, and a through shaft hole is formed along an axial direction of the supporting shaft, and an upper end of the side arc groove is connected to the shaft hole; when the high polymer material is subjected to thermochemical reaction, gas in the high polymer material can pass through the outer sleeve of the air-permeable mold and can be discharged from the shaft hole.
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| CN202210509121.3A CN114939963B (en) | 2022-05-11 | 2022-05-11 | Flash-free exhaust device and method for polymer product |
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| CN202210509121.3A CN114939963B (en) | 2022-05-11 | 2022-05-11 | Flash-free exhaust device and method for polymer product |
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| CN114939963B CN114939963B (en) | 2023-10-03 |
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| CN202388659U (en) * | 2011-11-16 | 2012-08-22 | 莱芜市福泉橡胶有限公司 | Inner tube mold convenient for exhausting |
| CN203254619U (en) * | 2013-03-19 | 2013-10-30 | 吴江凯明塑胶有限公司 | Exhaust structure of die |
| TW201520024A (en) * | 2013-11-28 | 2015-06-01 | E Pin Optical Industry Co Ltd | Mold configured to form a lens, lens and manufacturing method of a lens |
| CN208867480U (en) * | 2018-08-09 | 2019-05-17 | 苏州瑞至杰精密机械制造有限公司 | A kind of filter processing mold exhaust apparatus |
| CN208841768U (en) * | 2018-08-24 | 2019-05-10 | 厦门德冠科技有限公司 | A kind of plastic product injection-moulding device with assistant formation |
| CN108908809A (en) * | 2018-09-19 | 2018-11-30 | 山东豪迈机械科技股份有限公司 | A kind of capsule die |
| CN208759944U (en) * | 2018-09-26 | 2019-04-19 | 陕西智拓固相增材制造技术有限公司 | Gas permeable devices and mold |
| CN109262994A (en) * | 2018-11-16 | 2019-01-25 | 黄石市鼎晟模具有限公司 | A kind of exhaust structure of plastic mould |
| CN210937014U (en) * | 2019-09-18 | 2020-07-07 | 重庆虎溪电机工业有限责任公司 | Mold core with exhaust duct |
| CN211334194U (en) * | 2019-12-22 | 2020-08-25 | 青岛豪迈通模具有限公司 | Inner tube of a tyre mould convenient to exhaust |
| CN113771308A (en) * | 2021-08-25 | 2021-12-10 | 浙江凯华模具有限公司 | Exhaust structure of injection mold |
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