CN113997526A - Ejector block for preventing injection molding part from being ejected and loosened and using method - Google Patents
Ejector block for preventing injection molding part from being ejected and loosened and using method Download PDFInfo
- Publication number
- CN113997526A CN113997526A CN202111482887.9A CN202111482887A CN113997526A CN 113997526 A CN113997526 A CN 113997526A CN 202111482887 A CN202111482887 A CN 202111482887A CN 113997526 A CN113997526 A CN 113997526A
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- China
- Prior art keywords
- injection molding
- step surface
- piece
- top block
- ejector block
- Prior art date
- 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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Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 13
- 210000003205 muscle Anatomy 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 20
- 230000001154 acute effect Effects 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 3
- 101100334009 Caenorhabditis elegans rib-2 gene Proteins 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000012856 packing Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Images
Classifications
-
- 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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
- B29C45/401—Ejector pin constructions or mountings
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention provides a top block for preventing injection molding parts from being ejected and loosened and a using method thereof, wherein the top block comprises a top block body; a first step surface and a second step surface are arranged on one side surface of the ejector block body; the second step surface is positioned on the upper side of the first step surface, and an injection molding part connecting surface for connecting the first step surface and the second step surface is arranged between the first step surface and the second step surface; the injection molding is connected the face and is provided with bellied back-off muscle, the back-off muscle for the back-off is on the injection molding, in order to avoid the injection molding by ejecting scotch and fall the piece. After the injection molding of the mold is completed, the injection molding piece can be ejected out along with the ejector block, the injection molding piece is absorbed on the ejector block through the cooperation of the back-off ribs and the fixed mold core, the injection molding piece is prevented from being ejected out and scratched and falling, and the phenomenon that the line of a fixed mold core wire (namely an internal drawing core wire) of a product is thick during ejection is avoided.
Description
Technical Field
The invention relates to a mold, in particular to an ejector block for preventing ejection looseness of an injection molding part and a using method.
Background
In the injection mould using the PC as the material, the injection molding is being by the ejecting in-process of kicking block, if the core is not enough to the packing power of PC injection molding, very easily produces not hard up, can form two drawbacks, and firstly the easy ejection scotch of working of plastics, and cover half core line is thicker. And secondly, the plastic part directly falls off before being adsorbed by the mechanical arm under extreme conditions, so that the ejection process cannot be completed.
After the injection molding process of the vehicle lamp lens is finished, when an injection molding part is ejected, the distance between the injection molding part and a fixed mold core is gradually increased from 0, as shown in an enlarged right side view of fig. 3, and the shaded part of a triangle is a schematic diagram of the relative movement distance between the injection molding part and the core.
Since the relative movement between the stationary mold core and the injection molded part is in the vertical direction, the stationary mold core moves relative to the injection molded part in the ejection direction, assuming the injection molded part is in a stationary state. Because the outline difference of the left side and the right side of the car light lens is large, when the fixed die core is arranged to eject, the sizes and the densities of the ejector blocks on the left side and the right side of the fixed die core cannot be completely consistent, so that the ejecting forces on the left side and the right side are slightly unbalanced. In the moment of being ejected, the injection molding piece is slightly turned over due to the fact that the injection molding piece is ejected in an unbalanced mode on the left side and the right side, the fixed model core wire (namely the inner drawing core wire) is thick, and when the distance between the ejection track and the black piece is not large enough, the injection molding piece is scratched due to the fact that the ejection in the left side and the right side is unbalanced, and the appearance defect is formed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an ejector block for preventing an injection molding part from being ejected and loosened and a using method thereof.
The ejector block for preventing the injection molding piece from being ejected and loosened comprises an ejector block body;
a first step surface and a second step surface are arranged on one side surface of the ejector block body; the second step surface is positioned on the upper side of the first step surface, and an injection molding part connecting surface for connecting the first step surface and the second step surface is arranged between the first step surface and the second step surface;
the injection molding is connected the face and is provided with bellied back-off muscle, the back-off muscle for the back-off is on the injection molding, in order to avoid the injection molding by ejecting scotch and fall the piece.
Preferably, the height of the inverted rib is 0.6mm, and the width of the inverted rib is 25 mm.
Preferably, the ejection force F1 of the ejection block on the injection molding piece is balanced with the inverted buckle rib force F2 and the component force F3 of the packing force of the fixed mold core for molding the injection molding piece in the horizontal direction.
Preferably, the height of the inverted rib is 0.2 mm-0.6 mm, and the width is 10 mm-40 mm.
Preferably, the second step is inclined towards the bottom side surface of the top block body so as to form an acute angle structure with the injection molding part connecting surface.
Preferably, the top side surface of the top block body is parallel to the second step surface.
Preferably, the acute angle structure matches the angular end of the injection molded part.
The use method of the ejector block for preventing the ejection looseness of the injection molding part, provided by the invention, comprises the following steps:
after the injection molding of the mold is finished, the injection molding piece is ejected out along with the ejector block;
the inverted buckle rib is matched with the fixed die core to suck the injection molding piece on the ejector block, so that the injection molding piece is prevented from being ejected out and scratched and falling;
after the ejection process is finished, the injection molding part is subjected to hard demolding through the acting force of the manipulator, and the part taking action is finished.
Compared with the prior art, the invention has the following beneficial effects:
after the injection molding of the mold is completed, the injection molding piece can be ejected out along with the ejector block, the injection molding piece is absorbed on the ejector block through the cooperation of the back-off ribs and the fixed mold core, the injection molding piece is prevented from being ejected out and scratched and falling, and the phenomenon that the line of a fixed mold core wire (namely an internal drawing core wire) of a product is thick during ejection is avoided.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of a top block in the prior art;
FIG. 2 is a schematic structural diagram of an ejector block for preventing ejection looseness of an injection molding part in the embodiment of the invention;
FIG. 3 is a schematic view of the relative motion trajectory of a stationary mold core and an injection molded part in an embodiment of the present invention;
FIG. 4 is an enlarged partial view of FIG. 3 in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the principle of use of an ejector block for preventing ejection looseness of an injection molded part according to an embodiment of the invention;
FIG. 6 is a schematic view of the horizontal force analysis of the injection-molded part according to the embodiment of the invention.
In the figure:
1 is a top block; 2 is an inverted rib; 3 is an injection molding piece; and 4, a fixed mold core.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Fig. 2 is a schematic structural diagram of an ejector block for preventing ejection looseness of an injection molding part in an embodiment of the invention, and as shown in fig. 2, the ejector block 1 for preventing ejection looseness of the injection molding part provided by the invention comprises an ejector block body;
a first step surface and a second step surface are arranged on one side surface of the ejector block body; the second step surface is positioned on the upper side of the first step surface, and an injection molding part connecting surface for connecting the first step surface and the second step surface is arranged between the first step surface and the second step surface;
the injection molding is connected the face and is provided with bellied back-off muscle 2, back-off muscle 2 for 3 on the injection molding of back-off to avoid injection molding 3 by ejecting scotch and fall the piece.
In the embodiment of the invention, the height of the inverted rib 2 is 0.2-0.6 mm, and the width is 10-40 mm. Preferably, the height of the inverted rib 2 is 0.6mm, and the width is 25 mm.
In the embodiment of the invention, the ejection force F1 of the ejector block 1 on the injection molded part 3, the acting force F2 of the inverted buckle rib 2 and the component force F3 of the packing force of the fixed mold core 4 for molding the injection molded part 3 in the horizontal direction form stress balance.
In an embodiment of the invention, the second step is inclined towards the bottom side surface of the top block body so as to form an acute angle structure with the connecting surface of the injection molding piece. The acute angle structure is matched with the angle end of the injection molding part 3.
In the embodiment of the invention, the top side surface of the top block body is parallel to the second step surface.
Fig. 5 is a schematic view of a use principle of an ejector block for preventing ejection looseness of an injection molding part in an embodiment of the invention, and as shown in fig. 5, the use method of the ejector block for preventing ejection looseness of the injection molding part 3 provided by the invention comprises the following steps:
after the injection molding of the mold is finished, the injection molding piece 3 is ejected out along with the ejector block 1;
the inverted buckle rib 2 is matched with the fixed die core 4 to suck the injection molding piece 3 on the ejector block 1, so that the injection molding piece 3 is prevented from being ejected out and scratched and falling;
after the ejection process is finished, the injection molding part 3 is subjected to hard demolding through the acting force of the manipulator, and the part taking action is finished.
In fig. 5, the inverted rib 2 is embedded in the product, and after the injection molding of the mold is completed, the injection molded part 3 is ejected to the right together with the top block 1. As shown in fig. 6, when the PC injection molded part 3 is subjected to stress analysis in the horizontal direction, the ejection force F1 of the top block 1 on the product, the acting force F2 of the inverted buckle rib 2 and the component force F3 of the tightening force in the horizontal direction form stress balance, that is, F1 is F2+ F3, so that the product is firmly absorbed on the top block 1, the injection molded part 3 is prevented from being ejected and scratched and falling off, and the product fixed model core wire (i.e., the inner drawing core wire) is prevented from being thick during ejection. After the ejection process is finished, the actual back-off depth is shallower due to the back-off depth of only 0.6mm and the shrinkage size of the product, the acting force of the manipulator is enough to enable the injection molding part 3 to be subjected to hard demolding, and finally the part taking action is finished.
In the embodiment of the invention, after the injection molding of the mold is finished, the injection molding piece can be ejected out along with the ejector block, the injection molding piece is absorbed on the ejector block through the matching of the back-off ribs and the fixed mold core, the injection molding piece is prevented from being ejected out and scratched and falling, and the thicker line of the fixed mold core (namely the inner drawing core) of the product during ejection is avoided.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (8)
1. The ejector block for preventing injection molding pieces from being ejected and loosened is characterized by comprising an ejector block body;
a first step surface and a second step surface are arranged on one side surface of the ejector block body; the second step surface is positioned on the upper side of the first step surface, and an injection molding part connecting surface for connecting the first step surface and the second step surface is arranged between the first step surface and the second step surface;
the injection molding is connected the face and is provided with bellied back-off muscle, the back-off muscle for the back-off is on the injection molding, in order to avoid the injection molding by ejecting scotch and fall the piece.
2. The top block of claim 1, wherein the undercut rib has a height of 0.6mm and a width of 25 mm.
3. The top block for preventing ejection loosening of an injection molded part according to claim 1, wherein the top block is balanced in force between an ejection force F1 on the injection molded part and a force F2 of a reversed buckling rib and a component F3 of a wrapping force of a fixed mold core for molding the injection molded part in a horizontal direction.
4. The top block for preventing ejection looseness of an injection molding piece according to claim 1, wherein the height of the inverted buckle rib is 0.2mm to 0.6mm, and the width of the inverted buckle rib is 10mm to 40 mm.
5. The top block for preventing ejection loosening of an injection molded part according to claim 1, wherein the second step is inclined toward the bottom side surface of the top block body to form an acute angle configuration with the injection molded part connection surface.
6. The top block for preventing ejection looseness of an injection molded part according to claim 1, wherein a top side surface of the top block body and the second step surface are parallel to each other.
7. The top piece of claim 5, wherein the acute angle configuration matches an angular end of the injection molded part.
8. The use of the top block for preventing ejection loosening of injection molded parts according to any one of claims 1 to 7, comprising the steps of:
after the injection molding of the mold is finished, the injection molding piece is ejected out along with the ejector block;
the inverted buckle rib is matched with the fixed die core to suck the injection molding piece on the ejector block, so that the injection molding piece is prevented from being ejected out and scratched and falling;
after the ejection process is finished, the injection molding part is subjected to hard demolding through the acting force of the manipulator, and the part taking action is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111482887.9A CN113997526B (en) | 2021-12-07 | 2021-12-07 | Ejector block for preventing ejection looseness of injection molding part and application method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111482887.9A CN113997526B (en) | 2021-12-07 | 2021-12-07 | Ejector block for preventing ejection looseness of injection molding part and application method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113997526A true CN113997526A (en) | 2022-02-01 |
| CN113997526B CN113997526B (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111482887.9A Active CN113997526B (en) | 2021-12-07 | 2021-12-07 | Ejector block for preventing ejection looseness of injection molding part and application method |
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| CN113334712A (en) * | 2021-06-07 | 2021-09-03 | 常州市科尚模塑有限公司 | Injection molding device for mold |
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2021
- 2021-12-07 CN CN202111482887.9A patent/CN113997526B/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113997526B (en) | 2024-04-09 |
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