CN114939963B - Flash-free exhaust device and method for polymer product - Google Patents
Flash-free exhaust device and method for polymer product Download PDFInfo
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- CN114939963B CN114939963B CN202210509121.3A CN202210509121A CN114939963B CN 114939963 B CN114939963 B CN 114939963B CN 202210509121 A CN202210509121 A CN 202210509121A CN 114939963 B CN114939963 B CN 114939963B
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- shaft
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- high polymer
- ventilation
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A flash-free exhaust device and an exhaust method of a high polymer product comprise an air-permeable die jacket and a supporting shaft, wherein the outer side of the air-permeable die jacket is embedded in a high polymer material, and the upper end of the supporting shaft is embedded in the inner side of the air-permeable die jacket; the outside of back shaft upper end is laminated with the inboard of ventilative mould overcoat, and ventilative mould overcoat is made by ventilative material, and open the surface of back shaft upper end has the guiding gutter, and when macromolecular material carried out thermochemical reaction, the gas in the macromolecular material can pass ventilative mould overcoat and enter into the guiding gutter to follow the guiding gutter and discharge. The invention can ensure the exhaust effect without causing flash, can directly take out the product 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 high polymer material capsule product is formed by alternately compounding a plurality of layers of metal pieces and high polymer materials, and has the capsule cavity structure in the axial direction, and has the characteristics of large depth, large curvature and high apparent quality requirement. When the bag body structure is formed, air hole flash can be formed on the surface due to the fact that high polymer materials are converged on the surface and air is prone to be trapped. After the polymer reaction of the product with the structure in the mold without the vent hole, the surface of the capsule body structure of the product is easy to generate bubbles. After the exhaust hole is formed in the air nest position, the flash of the residual materials in the exhaust hole can cause apparent quality defects, the flash is long in removing time and difficult to clean, and the product is extremely easy to damage when the flash is removed. Therefore, the exhaust scheme without exhaust hole flash becomes a technical difficulty how to realize the smooth appearance of the bag body.
Moreover, because the cost of the ventilation die jacket made of the ventilation steel is very high, the support shaft made of the common metal material is used for supporting the ventilation die jacket and limiting the position of the ventilation die jacket, thereby greatly reducing the manufacturing cost of the whole die. However, the degree of adhesion between the support shaft and the ventilation die jacket is not high, so that the ventilation die 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 adhesion of the support shaft and the ventilation die jacket is too high, and the support shaft and the ventilation die jacket are easy to hold breath, so that the breath is accumulated between the support shaft and the ventilation die jacket, vibration of the ventilation die jacket can be caused, and the shape and quality of a product are also affected. Therefore, further research is needed on how to make the breathable die outer sleeve stable in position under the working state.
Disclosure of Invention
The invention aims to solve the technical problems that: according to the flash-free exhaust scheme of the polymer material capsule product, the flash without exhaust holes and the defects of air pockets are realized, so that the apparent quality, the qualification rate and the production efficiency of the product are improved.
The technical scheme provided by the invention is as follows: the flash-free exhaust device for the high polymer product comprises a breathable die jacket and a supporting shaft, wherein the outer side of the breathable die jacket is embedded in a high polymer material, and the upper end of the supporting shaft is embedded in the inner side of the breathable die jacket; the outside of back shaft upper end is laminated with the inboard of ventilative mould overcoat, and ventilative mould overcoat is made by ventilative material, and open the surface of back shaft upper end has the guiding gutter, and when macromolecular material carried out thermochemical reaction, the gas in the macromolecular material can pass ventilative mould overcoat and enter into the guiding gutter to follow the guiding gutter and discharge.
Preferably, the mold further comprises a mold outer frame, wherein a cavity is formed in the mold outer frame, and the high polymer material, the breathable mold outer sleeve and the supporting shaft are all arranged in the cavity.
Preferably, the ventilation die outer sleeve is a rotary body, the ventilation die outer sleeve comprises a spherical shell and a shell, the spherical shell is arranged at the upper end of the shell, the spherical shell is in seamless connection with the shell, the spherical shell is in a hollow hemispherical shape, and the shell is in a hollow truncated cone shape; 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 support 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 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, the upper end of the shaft body is provided with an annular shaft upper end face, and a through shaft hole is formed along the axial direction of the support shaft; when the high polymer material performs thermochemical reaction, the gas in the high polymer material can pass through the ventilation die jacket and then can be discharged from the shaft hole.
Preferably, the diversion trench comprises an annular groove and side arc grooves, the annular groove is a groove formed in the circumferential direction of the outer surface of the shaft head, the side arc grooves are grooves formed in the direction of a bus of the outer surface of the shaft head, the side arc grooves and the annular groove are distributed in a crossing manner, and the upper ends of the side arc grooves are connected with the shaft hole.
Preferably, when the upper end of the support shaft is attached to the inner side of the ventilation die sleeve, a gap exists between the lower end face of the shell at the lower end of the shell of the ventilation die sleeve and the upper end face of the shaft body at the upper end of the support shaft; when the high polymer material performs thermochemical reaction, the gas in the high polymer material passes through the ventilation die sleeve and enters the diversion trench, and then is discharged along the gap.
A flash-free exhaust method for high-molecular products is characterized in that an air-permeable mould jacket is arranged between a high-molecular material and a supporting shaft, and a diversion trench is arranged on the outer surface of the supporting shaft, so that when the high-molecular material performs thermochemical reaction, the air in the high-molecular material can pass through the air-permeable mould jacket to enter the diversion trench and be exhausted along the diversion trench.
Preferably, the mold comprises a mold outer frame, wherein a cavity is formed in the mold outer frame, and a high polymer material, a breathable mold outer sleeve and a supporting 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 thermochemical reaction of the high polymer material is restrained from entering the diversion trench from the ventilation die outer sleeve.
Preferably, the diversion trench comprises an annular groove and a side arc groove, the circumferential direction of the outer surface of the shaft head is provided with an annular groove, and the bus direction of the outer surface of the shaft head is provided with an arc-shaped side arc groove, so that the side arc groove and the annular groove are distributed in a crossing way; when the upper end of the support shaft is attached to the inner side of the ventilation die jacket, a gap exists between the lower end face of the shell at the lower end of the shell of the ventilation die jacket and the upper end face of the shaft body at the upper end of the support shaft; therefore, after entering the diversion trench from the ventilation die jacket, the air can downwards flow out into the gap along the annular grooves and the side arc grooves which are distributed in a crossed way, and is discharged from the gap.
Preferably, the support shaft is a rotary 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 performs thermochemical reaction, the gas in the high polymer material can pass through the ventilation die sleeve and then 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 body structure is composed of a ventilation mold steel jacket and an open pore supporting shaft, so that the exhaust effect can be ensured and flash cannot be caused.
2. The ventilation die steel jacket can be quickly replaced if being blocked in use.
3. Compared with the traditional mold structure, the invention can realize that the product can be directly taken out after the mold is opened in production practice, the product has no appearance damage, and the qualification rate of the product is improved. The post-treatment of the product capsule body structure is not needed, so that the operation labor intensity is greatly reduced, and the production efficiency of the product is improved.
4. Considering that the apparent quality requirement of the inner surface of the capsule body is high, the surface of the mold core is not perforated, and the flash formation is continuously and smoothly prevented. Aiming at the problem that bubbles are not easy to escape when the polymer material is injected, the ventilation die steel material is adopted to solve the exhaust problem.
5. The ventilation die steel has the problem of blockage, the quick replacement can be performed by using an assembling mode of matching the outer sleeve with the mandrel molded surface, and the vent hole is formed in the mandrel to ensure the exhaust effect.
Drawings
FIG. 1 is a schematic overall structure of a first embodiment;
FIG. 2 is a schematic structural view of a supporting shaft according to the first embodiment;
FIG. 3 is a schematic view of the structure of a gas permeable mold jacket according to the first embodiment;
FIG. 4 is a schematic view of the structure of the supporting shaft in the first comparative example;
FIG. 5 is a schematic view of a structure of a support shaft in a second comparative example;
in the figure: the high polymer material 1, the breathable die outer sleeve 2, the spherical shell 21, the shell 22, the shell upper end surface 221, the shell lower end surface 222, the supporting shaft 3, the shaft hole 31, the annular groove 321, the shaft head 32, the side arc groove 322, the shaft body 33, the shaft upper end surface 331, the die outer frame 4, the overflow channel 5 and the iron piece 6.
Detailed Description
The invention is further described below with reference to examples and figures:
example 1
In the prior exhaust mould, bubbles are easy to appear on the surface of a product with a capsule body structure in the cooling process, after the exhaust hole is formed in the position of the nest air, the flash of the residual materials in the exhaust hole can cause apparent quality defects, the flash is removed for a long time and is difficult to clean, and the product is extremely easy to damage when the flash is removed. The main reason for flash is that the product has high gas discharge speed in the cooling process, so that bubbles and flash are easy to occur. The ventilation die jacket 2 provided in this embodiment is made of ventilation steel, and the inside of the ventilation steel is formed by connecting fine small holes, so that gas can smoothly and slowly permeate and pass through. Therefore, the gas in the polymer material 1 can be discharged slowly, and bubbles and burrs are not generated.
As shown in fig. 1, the air discharging device includes a mold outer frame 4, an air-permeable mold outer jacket 2, and a support shaft 3. The mold outer frame 4 is provided with a cavity, the cavity is provided with a ventilation mold outer sleeve 2 and a support shaft 3, the mold outer frame 4 is provided with a through injection hole, and the injection hole is not shown in the figure. The polymer material 1 at high temperature is fluid and can be injected into the cavity of the mold outer frame 4 from the injection hole, and the excessive polymer material 1 overflows from the overflow channel 5 at the upper end of the mold outer frame 4. The high-temperature polymer material 1 contains gas, and the gas in the polymer material 1 is discharged outwards in the process of cooling the polymer material 1. The ventilation die sleeve 2 is arranged between the high polymer material 1 and the support shaft 3, the outer surface of the upper end of the support shaft 3 is provided with a diversion trench, and when the high polymer material 1 performs thermochemical reaction, the gas in the high polymer material 1 can pass through the ventilation die sleeve 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 ventilation mold casing 2 is embedded in the polymer material 1, an iron piece 6 is further embedded in the polymer material 1, the iron piece 6 is used for changing the rigidity of a polymer product, and the upper end of the support shaft 3 is embedded in the inner side of the ventilation mold casing 2. The outer side of the upper end of the supporting shaft 3 is attached to the inner side of the ventilation die outer sleeve 2, and the ventilation die outer sleeve 2 is made of ventilation materials. Preferably, the gas-permeable mould jacket 2 is made of gas-permeable steel. The ventilation die jacket 2 is a rotary body, the ventilation die jacket 2 comprises a spherical shell 21 and a shell 22, the spherical shell 21 is arranged at the upper end of the shell 22, the spherical shell 21 is in seamless connection with the shell 22, the spherical shell 21 is in a hollow hemispherical shape, and the shell 22 is in a hollow truncated cone shape. The outer diameter of the upper end of the shell 22 is larger than that of the lower end of the spherical shell 21, an annular shell upper end surface 221 is formed at the upper end of the shell 22, and an annular shell lower end surface 222 is arranged at the lower end of the shell 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 round table shape. The outer diameter of the upper end of the shaft body 33 is larger than that of the lower end of the shaft head 32, the upper end of the shaft body 33 is provided with an annular shaft upper end face 331, and a through shaft hole 31 is formed along the axial direction of the support shaft 3. When the polymer material 1 undergoes a thermochemical reaction, the gas in the polymer material 1 can pass through the gas-permeable mold jacket 2 and then 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 diversion trench, the diversion trench comprises an annular groove 321 and a side arc groove 322, the annular groove 321 is a groove which is formed in the circumferential direction of the outer surface of the shaft head 32, and the side arc groove 322 is a groove which is formed in the direction of a bus bar of the outer surface of the shaft head 32. The side arc grooves 322 are distributed to intersect with 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 lower end of the casing 22 of the air-permeable mold jacket 2 and the upper end surface 331 of the upper end of the shaft body 33 of the support shaft 3. When the high polymer material 1 performs thermochemical reaction, after the gas in the high polymer material 1 passes through the ventilation die outer sleeve 2 and enters the diversion trench, the gas at the annular groove 321 can enter the side arc groove 322 along the annular groove 321. When the gas flows downwards along the side arc grooves 322, the gas flows to a gap between the upper end faces 331 of the upper ends 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 one
As shown in fig. 4, this comparative example is different from the first embodiment in that the guide groove opened at the outer surface of the stub shaft 32 has only the annular groove 321 without the side arc groove 322. After the gas permeates the ventilation die outer sleeve 2, the gas is still easy to be suffocated between the shaft head 32 and the ventilation die outer sleeve 2, and the exhaust effect is poor.
Comparative example two
As shown in fig. 5, this comparative example is different from the first embodiment in that only the side arc grooves 322 of the diversion grooves opened on the outer surface of the stub shaft 32 have no annular groove 321. After the gas passes through the ventilation die jacket 2, part of the gas can flow to a gap between the upper end faces 331 of the shaft body 33 of the support shaft 3 along the side arc grooves 322, and then is discharged along the gap. Or part of the gas can flow to the shaft hole 31 along the side arc groove 322 and is discharged from the shaft hole 31, so that the exhaust effect is better.
It will be apparent that several improvements or modifications may be made without departing from the principles of the invention.
Claims (3)
1. The flash-free exhaust device for the high polymer product is characterized by comprising a breathable die jacket and a supporting shaft, wherein the outer side of the breathable die jacket is embedded in a high polymer material, and the upper end of the supporting shaft is embedded in the inner side of the breathable die jacket; the outer side of the upper end of the supporting shaft is attached to the inner side of the ventilation die jacket, the ventilation die jacket is made of ventilation materials, the outer surface of the upper end of the supporting shaft is provided with a diversion trench, and when the high polymer materials perform thermochemical reaction, the gas in the high polymer materials can pass through the ventilation die jacket to enter the diversion trench and be discharged along the diversion trench; the mold comprises a mold body, a mold outer frame, a high polymer material, a ventilation mold outer sleeve and a support shaft, wherein the mold outer frame is provided with a cavity; the breathable die outer sleeve is a rotary 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 in a hollow hemispherical shape, and the shell is in a hollow truncated cone shape; the outer diameter of the upper end of the shell is larger than that of the lower end of the spherical shell, the upper end of the shell is provided with an annular shell upper end face, and the lower end of the shell is provided with an annular shell lower end face; the support 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 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, the upper end of the shaft body is provided with an annular shaft upper end face, and a through shaft hole is formed along the axial direction of the support shaft; when the high polymer material performs thermochemical reaction, the gas in the high polymer material can pass through the ventilation die jacket and then can be discharged from the shaft hole; when the upper end of the support shaft is attached to the inner side of the ventilation die jacket, a gap exists between the lower end face of the shell of the lower end of the ventilation die jacket and the upper end face of the shaft body of the support shaft; when the high polymer material performs thermochemical reaction, the gas in the high polymer material passes through the ventilation die sleeve and enters the diversion trench, and then is discharged along the gap.
2. The flash-free exhaust device for the polymer product according to claim 1, wherein the diversion trench comprises an annular groove and a side arc groove, the annular groove is a groove formed in the circumferential direction of the outer surface of the shaft head, the side arc groove is a groove formed in the direction of a bus of the outer surface of the shaft head, the side arc groove and the annular groove are distributed in a crossing manner, and the upper end of the side arc groove is connected with the shaft hole.
3. A method for exhausting polymer products without flash by adopting a polymer product without flash exhaust device in claim 1 is characterized in that a ventilation die sleeve is arranged between a polymer material and a support shaft, and a diversion trench is arranged on the outer surface of the support shaft, so that gas in the polymer material can enter the diversion trench through the ventilation die sleeve and be exhausted along the diversion trench when the polymer material performs thermochemical reaction; shaping the high polymer material in the thermochemical reaction state at the cavity of the outer frame of the die, and enabling the high polymer material to be in a semi-closed state, so that gas generated in thermochemical reaction of the high polymer material is restrained from entering the diversion trench from the outer sleeve of the breathable die; when the upper end of the support shaft is attached to the inner side of the ventilation die jacket, a gap exists between the lower end face of the shell at the lower end of the shell of the ventilation die jacket and the upper end face of the shaft body at the upper end of the support shaft; so that the air-permeable mould jacket can downwards flow out of the gap along the annular grooves and the side arc grooves which are distributed in a crossed way after entering the diversion trench, and is discharged from the gap; setting the support shaft as a rotating body, and connecting the upper end of the side arc groove with the shaft hole; when the high polymer material performs thermochemical reaction, the gas in the high polymer material can pass through the ventilation die sleeve and then can be discharged from the shaft hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210509121.3A CN114939963B (en) | 2022-05-11 | 2022-05-11 | Flash-free exhaust device and method for polymer product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210509121.3A CN114939963B (en) | 2022-05-11 | 2022-05-11 | Flash-free exhaust device and method for polymer product |
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| Publication Number | Publication Date |
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| CN114939963A CN114939963A (en) | 2022-08-26 |
| CN114939963B true CN114939963B (en) | 2023-10-03 |
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| CN202210509121.3A Active CN114939963B (en) | 2022-05-11 | 2022-05-11 | Flash-free exhaust device and method for polymer product |
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| 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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