CN110281468B - Injection mold with overflow piece - Google Patents
Injection mold with overflow piece Download PDFInfo
- Publication number
- CN110281468B CN110281468B CN201910331607.0A CN201910331607A CN110281468B CN 110281468 B CN110281468 B CN 110281468B CN 201910331607 A CN201910331607 A CN 201910331607A CN 110281468 B CN110281468 B CN 110281468B
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- China
- Prior art keywords
- boss
- injection mold
- injection
- glass
- edge covering
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
- B29C45/14377—Coating a portion of the article, e.g. the edge of the article using an additional insert, e.g. a fastening element
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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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
- B29C45/14434—Coating brittle material, e.g. glass
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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
- 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
- B29L2031/3052—Windscreens
Abstract
The invention relates to the technical field of injection molds, in particular to an injection mold with an overflow block, which comprises an upper mold and a lower mold which are matched for use, wherein a mold cavity for accommodating glass is formed after the upper mold and the lower mold are closed, the mold cavity comprises an injection mold cavity which is arranged around the periphery of the glass, so that an injection molding material flow flows along the injection mold cavity and forms an edge covering strip on the periphery of the glass in an injection molding mode, and the injection mold is characterized in that: the upper surface of the edging is equipped with the boss, the boss distributes along glass's circumference, the cladding has the flash piece on the boss that is closest to the material flow end of the die cavity of moulding plastics, flash piece detachably installs the below at last mould, be equipped with in the flash piece and store up gluey groove, the first intercommunicating pore of intercommunication glue storage groove and the upper surface of the boss of cladding in the flash piece, the second intercommunicating pore of intercommunication glue storage groove and the medial surface of edging and the third intercommunicating pore of intercommunication glue storage groove and the lateral surface of edging. Has the advantages that: the complex injection-molded edge-wrapped product has more complete and attractive appearance, and the yield of the product is improved.
Description
The technical field is as follows:
the invention relates to the technical field of injection molds, in particular to an injection mold with an overflow block.
Background art:
at present, the loading and positioning of the glass edge covering assembly of the car window are mainly accurately positioned to the corresponding connecting position of the car body by the nail column at the back of the glass product of the car window and keep lasting reliability. The prior art usually adopts the insert mode of moulding plastics to fix the nail post to window glass, when moulding plastics glass edging promptly, wraps the nail post in window glass's edging with the insert form in. The mode has high bonding strength and quick production, and is a common nail column fixing mode.
In the existing integral injection molding process of glass and nail columns, the glass and the nail columns are usually fixed in a mold respectively, and then an edge covering material is injected between the glass and the nail columns to be molded together. The mould comprises an upper mould and a lower mould which are matched for use, a mould cavity for accommodating glass and accessories is formed after the upper mould and the lower mould are closed, and an injection moulding cavity for forming the edge covering strip by the PU forming material is formed. Before PU injection molding, glass is placed into a lower die, the outline of the glass is approximately aligned with an outer die frame of the lower die, a positioning block extends out of a final position for calibrating the glass, and a sucker positioning mechanism sucks the glass to prevent the glass from shifting in the injection molding process; and then the upper die and the lower die are assembled, the outer die frames of the upper die and the lower die tightly press the glass to prevent the glass from moving, if a slide block is designed, the upper ejector rod penetrates through a hole of the slide block during the assembly, and the slide block gradually approaches to the die frame under the traction of the upper ejector rod as the distance between the upper die and the lower die is closer and closer because the upper ejector rod has an inclined angle, and finally the slide block is spliced in the die frame after the assembly to form a part of a die cavity of the die.
The material flow in the die cavity of the large-scale PU injection die is too long in the injection molding process, the PU bicomponent isocyanate and the polyol are cured due to chemical reaction at the tail end of the material flow, and the subsequent material flow cannot continue to move forwards along the material flow direction, so that the defects of edge covering and material shortage and insufficient injection of the injection-molded edge-covering product are generated at the tail end of the material flow, waste products are caused, and the product yield is influenced. If increase PU injection volume, to the material stream end have complicated profile structure's such as nail post boss product of borduring, also can't solve thoroughly bordure and lack the material problem, fall over and increased the overlap volume of borduring product week, increased the deburring work load of later process.
The invention content is as follows:
the invention aims to solve the technical problem of the existing injection mold, and provides the injection mold with the overflow block, which has stable performance and attractive appearance of an injection finished product.
The technical scheme adopted by the invention for solving the technical problems is as follows: an injection mold with flash block, includes the last mould and the lower mould that cooperate and use, form the mould cavity that is used for holding glass after going up mould and lower mould compound die, the mould cavity includes the mould cavity that moulds plastics that sets up around the periphery of glass for the injection molding material flows along the mould cavity of moulding plastics and in the peripheral injection moulding of glass goes out the edging, its characterized in that: the upper surface of the edge covering strip is provided with bosses which are distributed along the circumferential direction of the glass, the bosses which are closest to the material flow end of the injection molding cavity are coated with flash blocks, the flash blocks are detachably arranged below the upper die, and the flash blocks are internally provided with glue storage grooves, first communication holes which are communicated with the glue storage grooves and the upper surfaces of the bosses coated in the flash blocks, second communication holes which are communicated with the glue storage grooves and the inner side surface of the edge covering strip, and third communication holes which are communicated with the glue storage grooves and the outer side surface of the edge covering strip.
Furthermore, the first communication hole is positioned inside the overflow block, the second communication hole is positioned on the inner side wall of the overflow block, and the third communication hole is positioned on the outer side wall of the overflow block.
Furthermore, the inner side wall of the overflow block is flush with the inner side surface of the edge covering strip, and the outer side wall of the overflow block is flush with the outer side surface of the edge covering strip.
Furthermore, the distance between two adjacent bosses is 190-210 mm.
Further, the first communicating hole is a single hole, the second communicating hole is at least two first small holes arranged along the inner side face of the edge covering strip, the sum of the sectional areas of the first small holes is smaller than that of the first communicating hole, the third communicating hole is at least two second small holes arranged along the outer side face of the edge covering strip, and the sum of the sectional areas of the second small holes is smaller than that of the first communicating hole.
Further, the sectional area of the first through hole is 25-30 mm2The sum of the sectional areas of the second communicating holes is 9-12 mm2The sum of the sectional areas of the third communicating holes is 9-12 mm2。
Further, the cross section of the first communication hole is long-strip-shaped, and the cross sections of the second communication hole and the third communication hole are circular.
Further, the height difference between the upper surface of the boss coated in the flash block and the bottom surface of the boss is 10-15 mm.
Further, the interval between the medial surface of borduring strip and the lateral surface of borduring strip is 55 ~ 65mm, the cladding in the interval of the medial surface of the boss in the flash block and the lateral surface of boss is 16 ~ 20 mm.
Furthermore, the upper surface of the boss is provided with an insert, a nail column is embedded in the insert, and the nail column is coated and fixed on the boss after integral injection molding.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: the defects of material shortage and insufficient filling of the edge covering generated at the tail end of the material flow of the glass edge covering assembly with the complex profile can be overcome, so that the appearance of the edge covering product is more complete and attractive, and the yield of the product is improved.
Description of the drawings:
FIG. 1 is a schematic structural view of an injection mold with a flash block according to the present invention, with an upper mold omitted;
FIG. 2 is a schematic structural view of the glass edge cladding assembly of FIG. 1;
FIG. 3 is an enlarged schematic view of the overflow block of FIG. 1;
FIG. 4 is an enlarged view of portion A of FIG. 2;
reference numerals in the drawings indicate: 1 is the lower mould, 2 is glass, 3 is the edging, 31 is the medial surface of edging, 32 is the lateral surface of edging, 33 is the boss, 331 is the upper surface of boss, 332 is the bottom surface of boss, 333 is the medial surface of boss, 334 is the lateral surface of boss, 4 is the flash block, 41 is the inside wall of flash block, 42 is the lateral wall of flash block, 43 is the glue storage tank, 44 is first intercommunicating pore, 45 is the second intercommunicating pore, 5 is the mold insert, 6 is the nail post.
The specific implementation mode is as follows:
the invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1 to 4, the injection mold with the flash block of the invention comprises an upper mold 1 and a lower mold 1 which are used in cooperation, wherein a mold cavity for accommodating glass 2 is formed after the upper mold 1 and the lower mold 1 are closed, the mold cavity comprises an injection mold cavity arranged around the periphery of the glass 2, so that an injection molding material flow flows along the injection mold cavity and an edge covering strip 3 is injection molded on the periphery of the glass 2, and the injection mold is characterized in that: the upper surface of the edge covering strip 3 is provided with a boss 33, the boss 33 is distributed along the circumferential direction of the glass 2, the boss 33 closest to the material flow end of the injection molding cavity is coated with an overflow block 4, the overflow block 4 is detachably mounted below the upper die, and a glue storage groove 43, a first communication hole 44 for communicating the glue storage groove 43 with the upper surface 331 of the boss 33 coated in the overflow block 4, a second communication hole 45 for communicating the glue storage groove 43 with the inner side surface 31 of the edge covering strip 3 and a third communication hole for communicating the glue storage groove 43 with the outer side surface 32 of the edge covering strip 3 are arranged in the overflow block 4.
In the invention, the edge covering strip 3 is provided with bosses 33 at intervals in the circumferential direction, the bosses 33 are used for installing accessories, and the profile of the bosses is complex. And because boss 33 is more, consequently there will certainly be a boss 33 near the end of material flow, leads to the plastics stream of moulding to appear near this and lack material, annotate appearance defect such as not full, especially can appear obvious appearance defect at the inside surface 31 and the outside surface 32 that the upper surface of boss 33 and edge strip 3 and upper die contacted. The flash block 4 provided with the glue storage groove 43 is arranged, the glue storage groove 43 is communicated with the material shortage areas, and the material flow is guided to fill the areas, so that the appearance defects of the flash block are eliminated.
In the invention, the flash block 4 is detachably connected with the upper die, and redundant flash in the flash block 4 can be conveniently removed after the die is opened. The overflow block 4 can be connected with an ejector plate on the die through a guide post and is used for the action of the overflow block, so that the overflow block can be opened and closed along with the opening and closing of the die. The flash block is retreated into an upper die cavity in the injection molding process, when the PU material flow for injection molding flows to the tail end of the cavity, the PU material flow positioned on one part of the upper surface and the side surface of the edge of the PU material flow is guided away through the first communicating hole, the second communicating hole and the third communicating hole and is stored in the glue storage groove, so that the subsequent material flow can continuously move forwards along the material flow direction, the material flow is filled in the whole injection molding cavity, and after the PU material flow in the injection molding cavity is completely reacted and solidified, the PU edge and the glass are combined together to form a complete and seamless glass edge-wrapping assembly product.
Further, the first communication hole 44 is located inside the flash block 4, the second communication hole 45 is located on the inner side wall 41 of the flash block 4, and the third communication hole is located on the outer side wall 42 of the flash block 4. The inner side wall 41 of the overflow block 4 is flush with the inner side surface 31 of the edge covering strip 3, and the outer side wall 42 of the overflow block 4 is flush with the outer side surface 32 of the edge covering strip 3. By adopting the technical scheme, the second communication hole 45 is communicated with the upper edge of the inner side face of the edge covering strip 3, the third communication hole is communicated with the upper edge of the outer side face of the edge covering strip 3, and flash is removed conveniently.
Further, in order to meet the positioning requirement, a plurality of bosses are arranged on the upper surface of the edge covering strip (i.e. the surface of the glass edge covering assembly facing the vehicle interior), and the distance between two adjacent bosses 33 is preferably 190mm to 210mm, wherein the distance refers to the arc length of the two adjacent bosses approximately along the peripheral direction of the glass.
Further, the first communication hole 44 is a single hole, the second communication hole 45 is at least two first holes arranged along the inner side surface 31 of the edge banding 3, the sum of the sectional areas of the first holes is smaller than the sectional area of the first communication hole, the third communication hole is at least two second holes arranged along the outer side surface 32 of the edge banding 3, and the sum of the sectional areas of the second holes is smaller than the sectional area of the first communication hole.
Because the width of boss is less than the width of borduring strip to there is certain difference in height between the upper surface of boss and the bottom surface, in the in-process of moulding plastics, the material flows and fills the lower part of borduring strip earlier, and upward flow fills the boss part again. If the second communicating hole and the third communicating hole are too big, the split function can be realized, so that the injection molding material flows to the second communicating hole and the third communicating hole, and the lug boss part cannot be filled. Simultaneously, first intercommunicating pore still plays the effect of leading away the material stream of the upper surface of borduring strip, can follow first intercommunicating pore and discharge in order to guarantee to flow terminal bubble of material and unnecessary PU material of moulding plastics, first intercommunicating pore needs second intercommunicating pore and third intercommunicating pore bigger size relatively.
Preferably, the cross-sectional area of the first communication hole 44 is 25 to 30mm2The sum of the sectional areas of the second communicating holes 45 is 9-12 mm2The sum of the sectional areas of the third communicating holes is 9-12 mm2. In order to facilitate material flow guiding during injection molding and to remove flash after injection molding is completed, the cross section of the first communication hole is preferably elongated, and the cross sections of the second communication hole and the third communication hole are preferably circular.
Further, the height difference H between the upper surface 331 of the boss 33 and the bottom surface 332 of the boss 33, which are coated in the overflow block 4, is 10-15 mm, the distance between the inner side surface 31 of the edge-coating strip 3 and the outer side surface 32 of the edge-coating strip 3 is 50-65 mm, and the distance L between the inner side surface 333 of the boss 33 and the outer side surface 334 of the boss 33, which are coated in the overflow block 4, is 16-20 mm.
Further, an insert 5 is arranged on the upper surface 331 of the boss 33, a nail post 6 is embedded in the insert 5, and the nail post 6 is coated and fixed on the boss 33 after being integrally injection-molded. Wherein, the boss 33 closest to the material flow end of the injection molding cavity is coated with the flash block 4, and the flash block 4 simultaneously coats the insert 5 on the boss 33.
The above description describes an injection mold with flash block according to the present invention, but the present invention is not limited to the above description, and therefore, any improvements, equivalent modifications, substitutions, etc. made according to the technical gist of the present invention are within the scope of the present invention.
Claims (9)
1. An injection mold with flash block, including last mould and lower mould (1) that cooperate and use, it forms the mould cavity that is used for holding glass (2) to go up mould and lower mould (1) compound die after, the mould cavity includes the injection mold cavity that sets up around the periphery of glass (2), makes the injection molding material flow along the injection mold cavity flows and in the peripheral injection moulding of glass (2) goes out edging (3), its characterized in that: the upper surface of the edge covering strip (3) is provided with a boss (33), the boss (33) is distributed along the circumferential direction of the glass (2), the boss (33) closest to the material flow end of the injection molding cavity is coated with an overflow block (4), the overflow block (4) is detachably mounted below the upper die, a glue storage groove (43), a first communication hole (44) for communicating the glue storage groove (43) with the upper surface (331) of the boss (33) coated in the overflow block (4), a second communication hole (45) for communicating the glue storage groove (43) with the inner side surface (31) of the edge covering strip (3) and a third communication hole for communicating the glue storage groove (43) with the outer side surface (32) of the edge covering strip (3) are arranged in the overflow block (4); the first communication hole (44) is a single hole, the second communication holes (45) are at least two first small holes arranged along the inner side surface (31) of the edge covering strip (3), the sum of the cross-sectional areas of the first small holes is smaller than that of the first communication holes, the third communication holes are at least two second small holes arranged along the outer side surface (32) of the edge covering strip (3), and the sum of the cross-sectional areas of the second small holes is smaller than that of the first communication holes.
2. An injection mold according to claim 1, characterized in that: the first communication hole (44) is positioned inside the overflow block (4), the second communication hole (45) is positioned on the inner side wall (41) of the overflow block (4), and the third communication hole is positioned on the outer side wall (42) of the overflow block (4).
3. An injection mold according to claim 2, characterized in that: the inner side wall (41) of the overflow block (4) is flush with the inner side surface (31) of the edge covering strip (3), and the outer side wall (42) of the overflow block (4) is flush with the outer side surface (32) of the edge covering strip (3).
4. An injection mold according to claim 1, characterized in that: the distance between two adjacent bosses (33) is 190-210 mm.
5. An injection mold according to claim 1, characterized in that: the sectional area of the first through hole (44) is 25-30 mm2The sum of the sectional areas of the second communicating holes (45) is 9-12 mm2The sum of the sectional areas of the third communicating holes is 9-12 mm2。
6. An injection mold according to claim 1, characterized in that: the cross section of the first communicating hole (44) is long-strip-shaped, and the cross sections of the second communicating hole (45) and the third communicating hole are circular.
7. An injection mold according to claim 1, characterized in that: the height difference between the upper surface (331) of the boss (33) coated in the overflow block (4) and the bottom surface (332) of the boss (33) is 10-15 mm.
8. An injection mold according to claim 1, characterized in that: the space between the inner side face (31) of the edge covering strip (3) and the outer side face (32) of the edge covering strip (3) is 55-65 mm, and the space between the inner side face (333) of the boss (33) and the outer side face (334) of the boss (33) wrapping the overflow block (4) is 16-20 mm.
9. An injection mold according to claim 1, characterized in that: the upper surface (331) of boss (33) is equipped with mold insert (5), it has nail post (6) to inlay in mold insert (5), nail post (6) are fixed through integrative injection moulding back cladding on boss (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910331607.0A CN110281468B (en) | 2019-04-24 | 2019-04-24 | Injection mold with overflow piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910331607.0A CN110281468B (en) | 2019-04-24 | 2019-04-24 | Injection mold with overflow piece |
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| Publication Number | Publication Date |
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| CN110281468A CN110281468A (en) | 2019-09-27 |
| CN110281468B true CN110281468B (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910331607.0A Active CN110281468B (en) | 2019-04-24 | 2019-04-24 | Injection mold with overflow piece |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112440435A (en) * | 2020-11-02 | 2021-03-05 | 智龙传动(厦门)科技有限公司 | Structure for reducing material shortage of attachment part during secondary injection molding of workpiece |
| CN113752480B (en) * | 2021-09-23 | 2023-04-18 | 信义汽车部件（芜湖）有限公司 | Skylight glass injection mold |
| CN115139462B (en) * | 2022-05-26 | 2023-12-15 | 东风柳州汽车有限公司 | Reaction injection molding die and preparation method of reaction injection molding product |
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