CN113997526B - Ejector block for preventing ejection looseness of injection molding part and application method - Google Patents
Ejector block for preventing ejection looseness of injection molding part and application method Download PDFInfo
- Publication number
- CN113997526B CN113997526B CN202111482887.9A CN202111482887A CN113997526B CN 113997526 B CN113997526 B CN 113997526B CN 202111482887 A CN202111482887 A CN 202111482887A CN 113997526 B CN113997526 B CN 113997526B
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- China
- Prior art keywords
- injection molding
- ejector block
- step surface
- rib
- molding piece
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 230000001154 acute effect Effects 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 3
- 101100334009 Caenorhabditis elegans rib-2 gene Proteins 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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
Abstract
The invention provides a jacking block for preventing ejection looseness of an injection molding part and a use method thereof, wherein the jacking block comprises a jacking block body; a first step surface and a second step surface are formed on one side surface of the top block body; the second step surface is positioned on the upper side of the first step surface, and an injection molding piece 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 piece connecting surface is provided with a raised back-off rib, and the back-off rib is used for back-off on the injection molding piece so as to prevent the injection molding piece from being ejected out to scratch and drop the piece. After the injection molding is finished by the mold, the injection molding piece can be ejected together with the ejector block, the injection molding piece is sucked on the ejector block through the back-off rib matched with the fixed mold core, the injection molding piece is prevented from being ejected to scratch and drop, and the thicker core wire (namely the inner core pulling wire) of the fixed mold of the product during ejection is avoided.
Description
Technical Field
The invention relates to a die, in particular to a jacking block for preventing ejection loosening of an injection molding part and a use method thereof.
Background
In an injection mold using a PC as a material, if the packing force of a mold core to the PC injection mold is insufficient in the ejection process of the injection mold by an ejector block, looseness is very easy to generate, two defects are formed, firstly, the plastic part is easy to be ejected and scratched, and a mold core line of a fixed mold is thicker. And secondly, in the extreme case, the plastic part directly falls off before being adsorbed by the mechanical arm, so that the ejection process cannot be completed.
After the injection molding process is finished, the distance between the injection molding piece and the fixed mold core is gradually increased from 0 when the injection molding piece is ejected, as shown in the right enlarged view of fig. 3, and the triangular shading part is a schematic diagram of the relative movement distance between the injection molding piece and the mold core.
Since the relative movement between the stationary mold core and the injection molding is in the vertical direction, the stationary mold core is moved in the ejection direction relative to the injection molding assuming the injection molding is in a stationary state. Because the contour difference of the left side and the right side of the car light lens is larger, when the fixed mold core is arranged and ejected, the sizes and the densities of the ejection blocks on the left side and the right side of the fixed mold core cannot be completely consistent, so that the ejection forces on the left side and the right side are slightly unbalanced. At the moment of ejection, the injection molding part can be slightly folded due to unbalanced ejection at the left side and the right side, a fixed mold core wire (namely an inner core pulling wire) can be thick, and when the distance between an ejection track and a black part is not large enough, the injection molding part can be scratched due to unbalanced ejection at the left side and the right side, so that appearance defects are formed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a jacking block for preventing ejection loosening of an injection molding part and a use method thereof.
The ejector block for preventing ejection looseness of the injection molding part comprises an ejector block body;
a first step surface and a second step surface are formed on one side surface of the top block body; the second step surface is positioned on the upper side of the first step surface, and an injection molding piece 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 piece connecting surface is provided with a raised back-off rib, and the back-off rib is used for back-off on the injection molding piece so as to prevent the injection molding piece from being ejected out to scratch and drop the piece.
Preferably, the height of the back-off rib is 0.6mm, and the width is 25mm.
Preferably, the ejector block forms a force balance between an ejection force F1 and a back-off rib acting force F2 of the injection molding part and a component force F3 of a packing force of the fixed mold core for injection molding in a horizontal direction.
Preferably, the height of the back-off 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 connecting surface.
Preferably, the top side surface of the top block body and the second step surface are parallel to each other.
Preferably, the acute angle structure is matched with the angle end of the injection molding piece.
According to the application method of the ejector block for preventing ejection looseness of the injection molding part, provided by the invention, the method comprises the following steps:
after the injection molding of the mold is completed, the injection molding part is ejected out along with the ejector block;
the back-off rib is matched with the fixed mold core to suck the injection molding piece on the ejector block, so that the injection molding piece is prevented from being ejected out to scratch and falling off;
after the ejection process is finished, the injection molding piece is hard demoulded through the acting force of the mechanical arm, and the piece taking action is finished.
Compared with the prior art, the invention has the following beneficial effects:
after the injection molding is finished by the mold, the injection molding piece can be ejected together with the ejector block, the injection molding piece is sucked on the ejector block through the back-off rib matched with the fixed mold core, the injection molding piece is prevented from being ejected to scratch and drop, and the thicker core wire (namely the inner core pulling wire) of the fixed mold of the product during ejection is avoided.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a top block according to the prior art;
FIG. 2 is a schematic diagram of a ejector block for preventing ejection loosening of an injection molding in an embodiment of the invention;
FIG. 3 is a schematic diagram of a relative motion trace of a stationary mold core and an injection molding member in an embodiment of the present invention;
FIG. 4 is an enlarged partial schematic view of FIG. 3 in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of a jack block for preventing ejection loosening of an injection molding according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a force analysis of an injection molding in a horizontal direction according to an embodiment of the present invention.
In the figure:
1 is a top block; 2 is a back-off 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 present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Fig. 2 is a schematic diagram of a block structure for preventing ejection loosening of an injection molding in an embodiment of the present invention, and as shown in fig. 2, the block 1 for preventing ejection loosening of an injection molding provided by the present invention includes a block body;
a first step surface and a second step surface are formed on one side surface of the top block body; the second step surface is positioned on the upper side of the first step surface, and an injection molding piece 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 connecting surface is provided with a raised back-off rib 2, and the back-off rib 2 is used for back-off the injection molding 3 so as to prevent the injection molding 3 from being ejected out to scratch and drop.
In the embodiment of the invention, the height of the back-off rib 2 is 0.2 mm-0.6 mm, and the width is 10 mm-40 mm. Preferably, the height of the back-off rib 2 is 0.6mm, and the width is 25mm.
In the embodiment of the present invention, the ejector block 1 forms a force balance between the force F2 applied to the ejection force F1 of the injection molding member 3 and the back-off rib 2, and the component force F3 of the tightening force of the fixed mold core 4 formed by the injection molding member 3 in the horizontal direction.
In the 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 3.
In the embodiment of the invention, the top side surface of the top block body and the second step surface are parallel to each other.
Fig. 5 is a schematic diagram of a use principle of an ejector block for preventing ejection loosening of an injection molding piece in an embodiment of the present invention, and as shown in fig. 5, the use method of the ejector block for preventing ejection loosening of an injection molding piece 3 provided by the present invention includes the following steps:
after the injection molding of the mold is completed, the injection molding part 3 is ejected out along with the ejector block 1;
the back-off rib 2 is matched with the fixed mold core 4 to suck the injection molding part 3 on the ejector block 1, so that the injection molding part 3 is prevented from being ejected out to scratch and drop;
after the ejection process is finished, the injection molding part 3 is hard demoulded through the acting force of the mechanical arm, and the part taking action is finished.
In fig. 5, the back-off rib 2 is embedded in the product, and after the injection molding is completed, the injection molding part 3 is ejected rightward along with the ejector block 1. As shown in fig. 6, the force analysis is performed on the PC injection molding part 3 in the horizontal direction, and the force balance is formed by the ejector 1 acting force F1 on the product, the acting force F2 on the back-off rib 2, and the component force F3 of the tightening force in the horizontal direction, that is, f1=f2+f3, so that the product is firmly sucked on the ejector 1, the injection molding part 3 is prevented from being ejected and scratched and falling, and thicker core wires (that is, inner core-pulling wires) of the product during ejection are avoided. After the ejection process is finished, the back-off depth is only 0.6mm, and the actual back-off depth is shallower due to the shrinkage size of the product, so that the acting force of the manipulator is enough to enable the injection molding part 3 to be hard demoulded, and finally the part taking action is finished.
According to the embodiment of the invention, after the injection molding of the mold is finished, the injection molding part can be ejected together with the ejector block, the injection molding part is sucked on the ejector block through the matching of the inverted buckle rib and the fixed mold core, the injection molding part is prevented from being ejected to scratch and drop, and the thicker core wire (namely the inner core-pulling wire) of the fixed mold of the product during ejection is avoided.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention.
Claims (6)
1. The ejector block for preventing ejection loosening of the injection molding piece is characterized by comprising an ejector block body;
a first step surface and a second step surface are formed on one side surface of the top block body; the second step surface is positioned on the upper side of the first step surface, and an injection molding piece 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 connecting surface of the injection molding piece is provided with a raised back-off rib, and the back-off rib is used for back-off on the injection molding piece so as to prevent the injection molding piece from being ejected out to scratch and drop;
the ejection force F1 of the injection molding part and the acting force F2 of the back-off rib of the ejector block form force balance on the component force F3 of the packing force of the fixed mold core formed by the injection molding part in the horizontal direction;
the height of the back-off rib is 0.2 mm-0.6 mm, and the width is 10 mm-40 mm.
2. The ejector block for preventing ejection loosening of an injection molded part as claimed in claim 1, wherein the height of the back-off rib is 0.6mm and the width is 25mm.
3. The ejector block of claim 1, wherein the second step is inclined toward a bottom side of the ejector block body to form an acute angle structure with the injection-molded part connecting surface.
4. The ejector block of claim 1, wherein the top side of the ejector block body and the second step face are parallel to each other.
5. A shoe for preventing ejection loosening of an injection molded part as claimed in claim 3, wherein the acute angle structure is matched with the corner end of the injection molded part.
6. A method of using the ejector block of any one of claims 1 to 5 to prevent ejection loosening of injection molded parts, comprising the steps of:
after the injection molding of the mold is completed, the injection molding part is ejected out along with the ejector block;
the back-off rib is matched with the fixed mold core to suck the injection molding piece on the ejector block, so that the injection molding piece is prevented from being ejected out to scratch and falling off;
after the ejection process is finished, the injection molding piece is hard demoulded through the acting force of the mechanical arm, and the piece 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 CN113997526A (en) | 2022-02-01 |
| CN113997526B true 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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2021
- 2021-12-07 CN CN202111482887.9A patent/CN113997526B/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113997526A (en) | 2022-02-01 |
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