CN111361096A - Injection mold and injection method for improving forming internal stress of vehicle-mounted light guide plate - Google Patents
Injection mold and injection method for improving forming internal stress of vehicle-mounted light guide plate Download PDFInfo
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- CN111361096A CN111361096A CN202010290221.2A CN202010290221A CN111361096A CN 111361096 A CN111361096 A CN 111361096A CN 202010290221 A CN202010290221 A CN 202010290221A CN 111361096 A CN111361096 A CN 111361096A
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- guide plate
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- injection molding
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- 238000002347 injection Methods 0.000 title claims abstract description 39
- 239000007924 injection Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title description 5
- 238000001746 injection moulding Methods 0.000 claims abstract description 44
- 230000002093 peripheral effect Effects 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 13
- 239000002131 composite material Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 238000007493 shaping process Methods 0.000 claims description 8
- 238000000748 compression moulding Methods 0.000 claims description 7
- 230000007246 mechanism Effects 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 3
- 230000002026 carminative effect Effects 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000012528 membrane Substances 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims 1
- 239000003292 glue Substances 0.000 abstract description 17
- 238000000465 moulding Methods 0.000 abstract description 8
- 230000001788 irregular Effects 0.000 abstract description 5
- 238000003892 spreading Methods 0.000 abstract description 5
- 230000007480 spreading Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Classifications
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to an injection mold for improving the forming internal stress of a vehicle-mounted light guide plate and an injection molding method, and the injection mold comprises a front mold and a rear film, wherein the front mold comprises a front mold core, the rear mold comprises a rear mold core, a mold cavity for forming the light guide plate is arranged between the front mold core and the rear mold core, the front mold core is provided with a mesh point forming surface for forming a mesh point surface of the light guide plate, the thickness of the mold cavity is a when the injection mold is completely closed, and the thickness of the mold cavity of the injection mold in the primary stage of injection molding filling is 0.02-0.03 mm larger than a so as to form a gap of 0.02-0.03 mm for. According to the invention, when the glue injection is started in the primary stage of glue injection molding and filling, the mold closing gap of 0.02-0.03 mm is controlled between the front mold and the rear mold, and the glue injection time of about 0.02-0.04 second is maintained, so that the exhaust effect of the parting surface of the mold cavity is good, the glue feeding resistance is small during molding, and the molten glue changes from irregular serpentine flow into spreading flow conforming to Newtonian fluid during filling, so that the speed gradient difference of the molten glue flowing in the mold cavity is reduced; the orientation stress of the light guide plate is relatively small.
Description
Technical Field
The invention relates to the technical field of light guide plate production, in particular to an injection mold and an injection method for improving the forming internal stress of a vehicle-mounted light guide plate.
Background
At present, the conventional vehicle-mounted light guide plate is formed by directly injecting plastic by using a common mold, the direct injection molding of the common mold easily causes overlarge internal stress of the vehicle-mounted light guide plate, so that the injection-molded light guide plate is cracked, and meanwhile, the light guide plate is deformed due to excessive shrinkage; or through compression mould compression moulding, because of compression mould structure is complicated, the machining precision requires highly, need adjust mould complex precision through trying the mould many times before production, and compression mould causes vertical deckle edge of light guide plate and light guide plate size unstability easily in addition in process of production, and compression mould volume production ability and uniformity are relatively poor, can not stable production in batches. Therefore, the invention researches and improves the conditions of large internal stress and post shrinkage deformation of the light guide plate during injection molding of the vehicle-mounted light guide plate on the basis of the existing common injection mold, and can stably produce the light guide plate in large batch.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an injection mold and an injection method for improving the forming internal stress of a vehicle-mounted light guide plate.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: the utility model provides an improve injection mold of on-vehicle light guide plate shaping internal stress, includes front mould, back membrane, the front mould includes front mould benevolence, back mould includes back mould benevolence, the die cavity that has the shaping light guide plate between front mould benevolence and the back mould benevolence, front mould benevolence is provided with the site profiled surface of shaping light guide plate site face, the thickness of die cavity is an when injection mold closes the compound die completely, injection mold is being penetrated the thickness of the primary stage die cavity that the shaping of gluing filled and is being greater than an 0.02 ~ 0.03mm to form the clearance that is used for the carminative 0.02 ~ 0.03mm of die cavity die joint.
In the technical scheme, the thickness of the cavity of the injection mold in the primary injection molding filling stage is 0.02-0.03 mm larger than a.
In the technical scheme, the mesh point forming surface is provided with a mesh point forming unit, the mesh point forming unit is composed of a plurality of composite mesh points in a matrix arrangement mode of n rows and m columns, each composite mesh point is composed of a central concave part and a plurality of peripheral concave parts, the peripheral concave parts are arranged on the outer circumference of the central concave part at equal angles by taking the central concave part as the center, and the edges of the peripheral concave parts are tangent to the edges of the central concave part; the central concave part and the peripheral concave part are both formed by a concave pit.
In the above technical solution, three to eight peripheral recesses are provided on an outer circumference of the central recess.
In the technical scheme, the diameter of the pits is within the range of 0.05-0.06 mm, and the diameter of the composite dots is within the range of 0.12-0.15 mm.
In order to achieve the above object, the present invention further provides an injection molding method, comprising the steps of:
step one, in the injection molding filling stage, the crosshead position of a mold closing mechanism is controlled through a servo motor of a mold locking system of an injection molding machine to adjust the mold closing position of a front mold and a rear mold of the injection molding mold, the thickness of a mold cavity formed after the front mold and the rear mold are closed is controlled to be a +0.03mm, an exhaust channel of a mold cavity parting surface is formed through a gap of 0.03mm, so that the flowing resistance of molten rubber in the mold cavity is reduced, the molten rubber injected into the mold cavity is spread and flows in a stable mode, the flowing speed gradient difference of the molten rubber in the mold cavity is reduced, the thickness of the mold cavity is maintained to be 0.02-0.04 s from the beginning of the injection molding, wherein a is the thickness of an injection molding light guide plate, and then the mold locking system is locked at;
and step two, in the compression molding and curing stage of the light guide plate, gradually releasing the mold locking force between the front mold and the rear mold through a multi-section mold opening by the mold locking system in the compression molding of the light guide plate, and maintaining the mold locking force of 20 tons until the cooling time of the light guide plate is finished, so that the compression injection molding of the light guide plate is completed, and the light guide plate can fully release the internal stress in the mold cavity.
In the technical scheme, the time consumption of the primary stage of injection molding filling is 0.02-0.04 s, and a gap of 0.03mm is maintained between the front mold and the rear mold; after the light guide plate is compressed, molded and solidified, the mold locking force is gradually reduced to release the stress of the light guide plate, and the stress is continued until the cooling time is over.
The invention has the advantages that the invention can eliminate the internal stress and the post-shrinkage deformation of the vehicle-mounted light guide plate during injection molding, has no compression mold with high requirement on manufacturing precision, short mold production period and low manufacturing cost, and is suitable for stably producing the vehicle-mounted light guide plate in large batch; the cross head position of the mold clamping mechanism is controlled by a servo motor of a mold clamping system of the injection molding machine to adjust the mold clamping position of the front mold and the rear mold, so that the flow of molten glue in a mold cavity is changed from irregular serpentine flow to stable spreading flow, the velocity gradient difference during flow is reduced, the orientation stress in the flow direction is reduced, and the shrinkage of the light guide plate is more uniform; when the glue injection is started in the primary stage of glue injection molding and filling, a mold closing gap of 0.02-0.03 mm is controlled between the front mold and the rear mold, the glue injection time of about 0.02-0.04 second is maintained, the exhaust effect of the parting surface of the mold cavity is good, the glue feeding resistance is small during molding, and the molten glue changes from irregular serpentine flow into spreading flow conforming to Newtonian fluid during filling, so that the speed gradient difference of the molten glue flowing in the mold cavity is reduced; the orientation stress of the light guide plate is relatively small; and in the light guide plate forming and curing stage, gradually loosening the mold locking force between the front mold and the rear mold through a multi-section mold opening by using a mold locking system, maintaining the mold locking force of 20 tons till the cooling time of the light guide plate is over, and completing compression injection molding of the light guide plate so that the light guide plate can fully release internal stress in a mold cavity.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural diagram of a mesh forming surface and a composite mesh.
In the figure: 1. a front mold; 11. a front mold core; 2. a mold cavity; 3. a light guide plate; 31. a gap; 4. a rear mold; 41. a rear mold core; 5. forming a mesh point forming surface; 6. compounding the mesh points; 61. a central recess; 62. a peripheral recess; 100. and (4) pits.
Detailed Description
Embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1-2, an injection mold for improving the internal stress of a vehicle-mounted light guide plate comprises a front mold 1 and a rear mold, wherein the front mold 1 comprises a front mold core 11, the rear mold 4 comprises a rear mold core 41, a mold cavity 2 for molding a light guide plate 3 is arranged between the front mold core 11 and the rear mold core 41, the front mold core 11 is provided with a mesh point molding surface 5 for molding a mesh point surface of the light guide plate, the thickness of the light guide plate 3 molded by the injection mold is a, the thickness of the mold cavity 2 when the injection mold is completely closed is a, and the thickness of the mold cavity 2 in the primary stage of injection molding filling is 0.02-0.03 mm greater than a, so as to form a gap 31 for exhausting 0.02-0.03 mm from the mold cavity mesh point surface.
The thickness of the cavity 2 of the injection mold in the initial stage of injection molding filling is 0.03mm larger than a.
The mesh point forming surface 5 is provided with a mesh point forming unit, the mesh point forming unit is composed of a plurality of composite mesh points 6 according to a matrix arrangement mode of n rows and m columns, the composite mesh points 6 are composed of a central concave part 61 and a plurality of peripheral concave parts 62, the peripheral concave parts 62 are arranged on the outer circumference of the central concave part 61 at equal angles by taking the central concave part 61 as a center, and the edges of the peripheral concave parts 62 are tangent to the edges of the central concave part 61; the central recess 61 and the peripheral recess 62 are each formed by a single dimple 100.
Six peripheral recesses 62 are provided on the outer circumference of the central recess 61.
The diameter of the pit 100 is 0.05mm, and the diameter of the composite mesh point 6 is 0.15 mm.
An injection molding method, according to the injection mold, comprising the steps of:
step one, in the injection molding filling stage, the crosshead position of a mold closing mechanism is controlled through a servo motor of a mold locking system of an injection molding machine to adjust the mold closing position of a front mold 1 and a rear mold 4 of the injection molding mold, the thickness of a mold cavity 2 of the closed front mold 1 and the closed rear mold 4 is controlled to be a +0.03mm, an exhaust channel of a parting surface of the mold cavity 2 is formed through a gap of 0.03mm, so that the flowing resistance of molten adhesive in the mold cavity 2 is reduced, the molten adhesive injected into the mold cavity 2 is spread and flows in a stable mode, the flowing speed gradient difference of the molten adhesive in the mold cavity 2 is reduced, the thickness of the mold cavity 2 is maintained to 0.02-0.04 s from the beginning of the injection molding, wherein a is the thickness of a light guide plate 3 for injection molding, and then the mold locking system is;
and step two, in the compression molding and curing stage of the light guide plate, gradually releasing the mold locking force between the front mold 1 and the rear mold 4 through a multi-section mold opening by the mold locking system in the compression molding of the light guide plate 3, and maintaining the mold locking force of 20 tons until the cooling time of the light guide plate 3 is finished, thereby completing the compression injection molding of the light guide plate 3 and enabling the light guide plate 3 to fully release the internal stress in the mold cavity 2.
The time consumption of the primary stage of injection molding filling is 0.02-0.04 s, and the gap between the front mold and the rear mold is maintained at 0.03 mm; after the light guide plate is compressed, molded and solidified, the mold locking force is gradually reduced to release the stress of the light guide plate, and the stress is continued until the cooling time is over.
The working principle of the existing compression mold is that the oil cylinder in the mold is used for pushing the slide block on the outer side of the mold core to be high, so that the thickness of the mold cavity 2 in the mold core is increased, the molten glue injection resistance (namely injection pressure) during molding in the mold cavity 2 is reduced, after the glue injection stage is completed, the oil cylinder returns, and the mold closing of the injection molding machine enables the thickness of the mold cavity 2 to return to the set thickness, so that the light guide plate 3 is compressed.
The compression injection molding scheme of the vehicle-mounted light guide plate 3 is that a common vehicle-mounted light guide plate 3 mold controls the position of a cross head of a mold clamping mechanism through a servo motor of a mold clamping system of an injection molding machine to adjust the mold clamping position of a front mold 4 and a rear mold 4, so that the flow of molten glue in a mold cavity 2 is changed from irregular serpentine flow into stable spreading flow, the velocity gradient difference during the flow and the resistance encountered during the molten glue flow are reduced, the orientation stress in the flow direction is reduced, and the light guide plate 3 is shrunk more uniformly; in the initial stage of injection molding and filling, the front and rear molds 4 are controlled to have a mold closing gap 31 of 0.02-0.03 mm and are maintained at about 0.02-0.04 for injection, the exhaust effect of the parting surface of the mold cavity is good, so that the exhaust of the mold cavity 2 is smooth, the mold feeding resistance is small during molding, and the molten adhesive changes from irregular serpentine flow into spreading flow conforming to Newtonian fluid during filling, so that the gradient difference of the flowing speed of the molten adhesive in the mold cavity is reduced; the orientation stress of the light guide plate is relatively small; and in the molding and curing stage of the light guide plate 3, gradually releasing the mold locking force between the front mold 1 and the rear mold 4 through a multi-section mold opening by using a mold locking system, maintaining the mold locking force of 20 tons until the cooling time of the light guide plate 3 is over, and completing the compression injection molding of the light guide plate 3 so that the light guide plate 3 can fully release the internal stress in the mold cavity 2.
The invention can eliminate the internal stress and the post-shrinkage deformation of the vehicle-mounted light guide plate 3 during injection molding, has no compression mold, has high requirement on manufacturing precision, short mold production period and low manufacturing cost, and is suitable for stably producing the vehicle-mounted light guide plate 3 in a large scale.
The technical scope of the present invention is not limited to the above embodiments, and any modifications, equivalent variations and modifications made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.
Claims (7)
1. The utility model provides an improve injection mold of on-vehicle light guide plate shaping internal stress, a serial communication port, including front mould, back membrane, the front mould includes front mould benevolence, back mould includes back mould benevolence, the die cavity that has the shaping light guide plate between front mould benevolence and the back mould benevolence, front mould benevolence is provided with the site profiled surface of shaping light guide plate site face, the thickness of die cavity is a when injection mold closes the compound die completely, injection mold is being penetrated the thickness ratio a big 0.02 ~ 0.03mm that the primary stage die cavity that the shaping was filled is big to 0.02 ~ 0.03mm clearance to form and be used for the carminative 0.02 ~ 0.03mm clearance of die.
2. The injection mold for improving the forming internal stress of the vehicular light guide plate according to claim 1, wherein the thickness of the cavity of the injection mold in the initial stage of filling the injection molding is greater than a by 0.03 mm.
3. The injection mold for improving the forming internal stress of the vehicular light guide plate according to claim 1, wherein the dot forming surface has a dot forming unit, the dot forming unit is composed of a plurality of composite dots arranged in a matrix of n rows and m columns, the composite dots are composed of a central concave portion and a plurality of peripheral concave portions, the plurality of peripheral concave portions are arranged on the outer circumference of the central concave portion at equal angles with the central concave portion as the center, and the edges of the peripheral concave portions are tangent to the edges of the central concave portion; the central concave part and the peripheral concave part are both formed by a concave pit.
4. An injection mold for improving the forming internal stress of the vehicular light guiding plate as claimed in claim 3, wherein three to eight peripheral recesses are provided on the outer circumference of the central recess.
5. The injection mold for improving the forming internal stress of the vehicular light guide plate according to claim 4, wherein the diameter of the pits is in a range of 0.05-0.06 mm, and the diameter of the composite dots is in a range of 0.12-0.15 mm.
6. An injection molding method, characterized in that the injection mold according to any one of claims 1 to 5 is subjected to the following steps:
step one, in the injection molding filling stage, the crosshead position of a mold closing mechanism is controlled through a servo motor of a mold locking system of an injection molding machine to adjust the mold closing position of a front mold and a rear mold of the injection molding mold, the thickness of a mold cavity formed after the front mold and the rear mold are closed is controlled to be a +0.03mm, an exhaust channel of a mold cavity parting surface is formed through a gap of 0.03mm, so that the flowing resistance of molten rubber in the mold cavity is reduced, the molten rubber injected into the mold cavity is spread and flows in a stable mode, the flowing speed gradient difference of the molten rubber in the mold cavity is reduced, the thickness of the mold cavity is maintained to be 0.02-0.04 s from the beginning of the injection molding, wherein a is the thickness of an injection molding light guide plate, and then the mold locking system is locked at;
and step two, in the compression molding and curing stage of the light guide plate, gradually releasing the mold locking force between the front mold and the rear mold through a multi-section mold opening by the mold locking system in the compression molding of the light guide plate, and maintaining the mold locking force of 20 tons until the cooling time of the light guide plate is finished, so that the compression injection molding of the light guide plate is completed, and the light guide plate can fully release the internal stress in the mold cavity.
7. An injection molding method as claimed in claim 6, wherein the time of the primary stage of injection molding filling is 0.02-0.04 s, and the gap between the front and rear molds is maintained at 0.03 mm; after the light guide plate is compressed, molded and solidified, the mold locking force is gradually reduced to release the stress of the light guide plate, and the stress is continued until the cooling time is over.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010290221.2A CN111361096A (en) | 2020-04-14 | 2020-04-14 | Injection mold and injection method for improving forming internal stress of vehicle-mounted light guide plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010290221.2A CN111361096A (en) | 2020-04-14 | 2020-04-14 | Injection mold and injection method for improving forming internal stress of vehicle-mounted light guide plate |
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| CN111361096A true CN111361096A (en) | 2020-07-03 |
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| CN202010290221.2A Pending CN111361096A (en) | 2020-04-14 | 2020-04-14 | Injection mold and injection method for improving forming internal stress of vehicle-mounted light guide plate |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101293393A (en) * | 2007-04-28 | 2008-10-29 | 株式会社名机制作所 | Light guide plate forming mold and light guide plate forming method |
| CN104626495A (en) * | 2014-12-12 | 2015-05-20 | 中国航空工业集团公司北京航空材料研究院 | Injection molding production method of transparent product with thick-walled curved surface structure |
| CN208020619U (en) * | 2017-12-06 | 2018-10-30 | 芜湖德仓光电有限公司 | A kind of light guiding board mould core molding machine |
| CN212400166U (en) * | 2020-04-14 | 2021-01-26 | 奕东电子科技股份有限公司 | Injection mold for improving forming internal stress of vehicle-mounted light guide plate |
-
2020
- 2020-04-14 CN CN202010290221.2A patent/CN111361096A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101293393A (en) * | 2007-04-28 | 2008-10-29 | 株式会社名机制作所 | Light guide plate forming mold and light guide plate forming method |
| CN104626495A (en) * | 2014-12-12 | 2015-05-20 | 中国航空工业集团公司北京航空材料研究院 | Injection molding production method of transparent product with thick-walled curved surface structure |
| CN208020619U (en) * | 2017-12-06 | 2018-10-30 | 芜湖德仓光电有限公司 | A kind of light guiding board mould core molding machine |
| CN212400166U (en) * | 2020-04-14 | 2021-01-26 | 奕东电子科技股份有限公司 | Injection mold for improving forming internal stress of vehicle-mounted light guide plate |
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