CN114986817B - Plastic part cantilever forming anti-sticking front mold method and structure thereof - Google Patents
Plastic part cantilever forming anti-sticking front mold method and structure thereof Download PDFInfo
- Publication number
- CN114986817B CN114986817B CN202210614449.1A CN202210614449A CN114986817B CN 114986817 B CN114986817 B CN 114986817B CN 202210614449 A CN202210614449 A CN 202210614449A CN 114986817 B CN114986817 B CN 114986817B
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- China
- Prior art keywords
- sliding block
- cantilever
- core pulling
- mold
- buckle
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- 238000000034 method Methods 0.000 title abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 15
- 230000000903 blocking effect Effects 0.000 claims description 6
- 230000004888 barrier function Effects 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 abstract description 7
- 230000001070 adhesive effect Effects 0.000 abstract description 7
- 239000003292 glue Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007493 shaping process Methods 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
- B29C45/26—Moulds
- B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
-
- 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
- B29C45/44—Removing or ejecting moulded articles for undercut articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a cantilever molding anti-sticking front mold method and a structure thereof for plastic parts, wherein the plastic parts are molded by a front mold and a rear mold in a mold closing way, and the structure comprises a sliding block embedded in the rear mold, a core drawing plate arranged along the sliding block in a sliding way, and a cantilever insert which is arranged in the front mold and corresponds to the core drawing plate in a mold closing way; the plastic part comprises at least one pair of buckle structures, an inner opening of each buckle structure is matched with the cantilever insert in a clamping manner when the buckle structures are formed, and the limiting pulling force of the sliding block is opposite to the demolding force of the cantilever insert when the buckle structures are demolded. The invention realizes the positioning of the adhesive force of the rear mold, avoids the demolding adhesion of the buckle structure to the front mold, and improves the molding precision of the plastic part.
Description
Technical Field
The invention belongs to the technical field of dies, and particularly relates to an anti-sticking front die structure for cantilever molding of plastic parts.
Background
The plastic part molding buckle structure mold aims at the buckle structure with suspended tiny ribs, as the surface of the buckle structure needs to be provided with a molding inclined plane, a cantilever insert is usually arranged on a front mold for molding the buckle structure, the surface glue of the buckle structure is positioned on the front mold, and according to the characteristics of the buckle structure of a product, the product is adhered to the front mold in the demolding process, or the buckle structure is deformed or broken; meanwhile, the rib positions of the buckle structure are small, the buckle structure is not suitable for increasing the back-off ejection structure, and ejection deformation or fracture risks are easy to cause. Therefore, there is a need for a mold structure that increases the adhesion of the rear mold to avoid sticking of the product to the front mold.
Disclosure of Invention
The invention aims to solve the technical problems, and provides a cantilever forming anti-sticking front mould method and a structure thereof for plastic parts, so that the positioning of the adhesive force of a rear mould is increased, the front mould is prevented from being adhered by a clamping structure in a demoulding manner, and the forming precision of the plastic parts is improved. In order to achieve the above purpose, the technical scheme of the invention is as follows:
the cantilever forming and anti-sticking front mold method for the plastic part comprises the following steps:
a sliding block is horizontally arranged in the rear die in a sliding way, a core drawing plate is horizontally arranged in the sliding block in a sliding way, and a cantilever insert is arranged in the front die; the core pulling plate and the cantilever insert are clamped and injection molded to form a cavity of the buckle structure, the depth of the inner opening of the cantilever insert extending into the buckle structure is consistent with the longitudinal height of the inner opening, and the core pulling plate is attached to the bottom surface of the buckle structure;
connecting pieces which are integrally connected with the buckle structure and are spaced are injection-molded between the core pulling plate and the sliding block, and limiting grooves for forming limiting pieces on the connecting pieces are formed in the sliding block;
when the die is opened, the core pulling plate is separated from the bottom surface of the clamping structure in advance, the cantilever insert is separated from the surface of the clamping structure and the inner opening again, and the position of the sliding block opposite to the limiting piece is provided with limiting pulling force opposite to the demolding force of the cantilever insert;
the sliding block slides along the guiding direction of the limiting piece on the connecting piece to be separated.
The anti-sticking front mold structure for cantilever molding of the plastic part is formed by mold closing of a front mold and a rear mold, and comprises a sliding block embedded in the rear mold, a core drawing plate arranged along the sliding block in a sliding manner, and a cantilever insert which is arranged in the front mold and corresponds to the mold closing of the core drawing plate; the plastic part comprises at least one pair of buckle structures, an inner opening of the buckle structures is matched with the cantilever insert in a clamping manner during molding, the core pulling plate is attached to the bottom surface of the buckle structures, and the limiting pulling force of the sliding block and the demolding force of the cantilever insert are opposite when the buckle structures are demolded.
Specifically, the plastic part further comprises a main body integrally connected with the buckle structure, a connecting sheet arranged below the buckle structure and a blocking strip arranged at intervals on the side edge of the buckle structure; a core pulling groove is formed between the connecting sheet and the buckle structure, the core pulling plate is correspondingly clamped with the core pulling groove, and an outer opening is formed between the barrier strip and the buckle structure.
Specifically, be equipped with the spout that is used for holding the slider in the back mould, the slider sets up along the horizontal slip of spout.
Specifically, an inner cavity for accommodating the core drawing plate is arranged in the sliding block, and a connecting sheet is formed between the bottom surface of the core drawing plate and the inner cavity of the sliding block.
Specifically, the bottom surface of connection piece is equipped with a set of locating part of symmetrical arrangement, be equipped with the slope on the locating part and lean on the face, the inner chamber of slider is equipped with the spacing groove that corresponds with the locating part profile modeling, spacing groove and locating part slip joint cooperation.
Specifically, a step groove is formed in the core pulling plate, a buckling structure is formed between the bottom of the step groove and the side wall of the sliding block, and the core pulling plate horizontally penetrates through the sliding block and is correspondingly clamped with the outer opening.
Specifically, the bottom surface of the cantilever insert is matched and abutted with the bottom of the step groove.
Specifically, a lower ejector column for ejecting the main body for demolding is arranged in the rear mold.
Specifically, the both sides of slider are equipped with respectively and extend to buckle structure outside shaping and the fashioned sliding edge in blend stop outside.
Compared with the prior art, the plastic part cantilever forming anti-sticking front mold structure has the beneficial effects that:
the core pulling plate is arranged in the inner cavity of the sliding block, so that a cavity for forming the connecting sheet is formed, a limiting groove corresponding to the profile modeling of the limiting piece is formed in the inner cavity of the sliding block, the sliding block has limiting pulling force on the limiting piece, and when the cantilever insert is separated from the clamping structure, the limiting piece can be kept on the rear die, so that the clamping structure is effectively prevented from following the blocking movement of the cantilever insert; meanwhile, the bottom surface and the end parts of the buckling structure are formed on the side walls of the core drawing plate and the sliding block, the adhesive force of the rear mold is increased, and the forming precision of the integral plastic part is improved.
Drawings
FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention;
FIG. 2 is a schematic view showing the surface structure of a rear mold according to the present embodiment;
FIG. 3 is a schematic view of a partial structure of a core back plate according to the present embodiment;
FIG. 4 is a second schematic view of a partial structure of the core back plate according to the present embodiment;
FIG. 5 is a schematic view of a plastic part according to the embodiment;
FIG. 6 is a schematic view of a cantilever insert in this embodiment;
the figures represent the numbers:
1 plastic part, 11 front mould, 12 back mould, 13 buckle structure, 14 inner opening, 15 main body, 16 connecting piece, 17 blend, 18 core pulling groove, 19 outer opening, 2 slider, 21 spout, 22 inner cavity, 23 sliding edge, 3 core drawing board, 31 step groove, 4 cantilever mold insert, 5 glue inlet, 51 lower top column, 6 limiting piece, 61 inclined leaning surface, 62 limiting groove.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, but is apparent to those skilled in the art in view of the present invention.
Example 1:
referring to fig. 1-6, the cantilever forming anti-sticking front mold method for the plastic part comprises the following steps:
a sliding block 2 is arranged in the rear die 12 in a horizontal sliding manner, a core drawing plate 3 is arranged in the sliding block 2 in a horizontal sliding manner, and a cantilever insert 4 is arranged in the front die 11;
the core pulling plate 3 and the cantilever insert 4 are clamped and injection molded to form a cavity of the buckling structure 13, the depth of the cantilever insert 4 extending into the inner opening 14 of the buckling structure 13 is consistent with the longitudinal height of the inner opening 14, the core pulling plate 3 is attached to the bottom surface of the buckling structure 13, the adhesive force of the bottom surface of the buckling structure 13 is increased, the surface appearance molding of the buckling structure 13 is not affected, the end face of the buckling structure 13 is molded at the side wall switching position of the core pulling plate 3 and the sliding block 2, and the molding structure of the inner opening 14 is not affected when the core pulling plate 3 and the sliding block 2 are subsequently demoulded; the core pulling plate 3 is arranged to move in the horizontal direction, and the demolding force of the core pulling plate 3 is vertically arranged relative to the demolding force of the cantilever insert 4. The fastening structure 13 can increase the adhesive force of the fastening structure 13 attached to the surface of the core pulling plate 3 in the surface forming process of the core pulling plate 3, and after the core pulling plate 3 is demoulded, the internal stress of the fastening structure 13 changes, so that the adhesive force between the cantilever insert 4 and the inner opening 14 is reduced.
Connecting pieces 16 which are integrally connected with the buckling structures 13 and spaced are formed between the core drawing plate 3 and the sliding blocks 2 in an injection molding mode, and limiting grooves 62 for forming limiting pieces 6 on the connecting pieces 16 are formed in the sliding blocks 2;
when the die is opened, the core pulling plate 3 is separated from the bottom surface of the buckling structure 13 in advance, the cantilever insert 4 is separated from the surface of the buckling structure 13 and the inner opening 14 again, and the position of the sliding block 2 opposite to the position of the limiting piece 6 has a limiting pulling force opposite to the demolding force of the cantilever insert 4;
the slide 2 is slidingly disengaged along the guiding direction of the stop 6 on the tab 16.
The cantilever forming and anti-sticking front mold method for the plastic part further comprises the following steps: the buckle structure 13 is connected to the side of the main body 15, the main body 15 is formed by clamping the front die 11 and the rear die 12, after the die is opened, the main body 15 is reserved on the surface of the rear die 12, the lower ejector rod 51 in the rear die 12 ejects the main body 15, and meanwhile, the main body 15 drives the buckle structure 13 to be demolded together.
Example 2:
referring to fig. 1-6, the embodiment is a cantilever-shaped anti-sticking front mold structure for plastic parts, wherein a plastic part 1 is molded by clamping a front mold 11 and a rear mold 12, and comprises a sliding block 2 embedded in the rear mold 12, a core pulling plate 3 arranged along the sliding block 2 in a sliding manner, and a cantilever insert 4 arranged in the front mold 11 and corresponding to the clamping of the core pulling plate 3; the plastic part 1 comprises at least one pair of buckling structures 13, an inner opening 14 of the buckling structures 13 is matched with the cantilever insert 4 in a clamping manner when the buckling structures 13 are formed, the core drawing plate 3 is attached to the bottom surface of the buckling structures 13, and the limiting pulling force of the sliding block 2 and the demolding force of the cantilever insert 4 are opposite to each other when the buckling structures 13 are demolded.
The plastic part 1 further comprises a main body 15 integrally connected with the buckling structure 13, a connecting sheet 16 arranged below the buckling structure 13 and a blocking strip 17 arranged at intervals on the side edge of the buckling structure 13; a loose core groove 18 is formed between the connecting sheet 16 and the buckling structure 13, and an outer opening 19 is formed between the baffle strip 17 and the buckling structure 13. A sliding groove 21 for accommodating the sliding block 2 is arranged in the rear die 12, and a cavity for forming the main body 15 of the plastic part 1 is arranged on the surface of the rear die 12 at the side edge of the sliding groove 21. The main body 15 is formed in a surface cavity of the rear mould 11, and a glue inlet 5 is formed at the end part of the main body 15, which is away from the buckling structure 13. The glue inlet 5 is formed by starting glue feeding from the thicker end face of the plastic part 1 to the buckle structure 13 with the thinner tail end, and the plastic part 1 is stable and quick in forming.
The slider 2 is internally provided with an inner cavity 22 for accommodating the core pulling plate 3, a connecting sheet 16 is formed between the bottom surface of the core pulling plate 3 and the inner cavity 22 of the slider 2, and the core pulling plate 3 is correspondingly clamped with the core pulling groove 18. The bottom surface of connection piece 16 is equipped with a set of locating part 6 of symmetrical arrangement, is equipped with the slope on the locating part 6 and leans on face 61, and slider 2 is along spout 21 horizontal slip setting, and the inner chamber 22 of slider 2 is equipped with the spacing groove 62 that corresponds with locating part 6 profile modeling, and spacing groove 62 and locating part 6 slip joint cooperation. When the mold is opened, the slide block 2 has a limiting pulling force relative to the inclined leaning surface 61 of the limiting piece 6, so that the cantilever insert 4 positioned in the front mold 11 in the inner opening 14 of the buckle structure 13 can be smoothly demolded, and the plastic piece 1 can not adhere to the front mold 11 to cause a strain problem.
The core pulling plate 3 is provided with a step groove 31, the end part of the buckling structure 13 is formed between the bottom of the step groove 31 and the side wall of the sliding block 2, and the core pulling plate 3 horizontally penetrates through the sliding block 2 and is correspondingly clamped with the outer opening 19. The bottom of the cantilever insert 4 is clamped with the inner opening 14 of the clamping structure 13, and meanwhile, the bottom surface of the cantilever insert 4 is clamped and abutted with the bottom of the step groove 31.
A lower post 51 for releasing the ejector body 15 is provided in the rear mold 12. The sliding edges 23 extending to the outer side of the buckling structure 13 and the outer side of the blocking strip 17 are respectively arranged on two sides of the sliding block 2.
When the embodiment is applied, the inner slide block 2, the core pulling plate 3 and the cantilever insert 4 in the mold are moved in place, injection molding is performed in the cavity, during mold opening, the core pulling plate 3 horizontally slides to release the core pulling groove 18 so as to separate from the bottom surface of the buckle structure 13 and the position of the connecting sheet 16, the cantilever insert 4 is released from the core pulling plate 3 and ascends so as to separate from the position of the inner opening 14 of the buckle structure 13, the inner cavity 22 of the slide block 2 horizontally slides to separate from the limiting piece 6, meanwhile, the sliding edge 23 follows the slide block 2 to separate from the outer side of the buckle structure 13 and the position of the outer side of the barrier strip 17, and the lower ejector post 51 ejects the main body 15 so as to separate from the cavity, thus completing the integral demolding of the plastic part 1.
In the embodiment, the core pulling plate 3 is arranged in the inner cavity 22 of the sliding block 2, so that a cavity for forming the connecting sheet 16 is formed, a limiting groove 62 corresponding to the profile modeling of the limiting piece 6 is formed in the inner cavity 22 of the sliding block 2, the sliding block 2 has limiting tension on the limiting piece 6, and when the cantilever insert 4 is separated from the clamping structure 13, the limiting tension of the sliding block 2 on the limiting piece 6 can be kept on the rear die 12, so that the clamping structure 13 is effectively prevented from following the blocking movement of the cantilever insert 4; meanwhile, the bottom surface and the end parts of the buckling structure 13 are formed on the side walls of the core pulling plate 3 and the sliding block 2, the adhesive force of the rear mold 12 is increased, and the forming precision of the integral plastic part 1 is improved.
In the description of the present invention, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention are described above, the embodiments are only used for facilitating understanding of the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is to be determined by the appended claims.
Claims (5)
1. The anti-sticking front mold structure for cantilever molding of plastic parts is characterized in that the plastic parts are molded by clamping a front mold and a rear mold: the mold comprises a sliding block embedded in a rear mold, a core pulling plate arranged along the sliding block, and a cantilever insert which is arranged in a front mold and corresponds to the mold closing of the core pulling plate; the plastic part comprises at least one pair of buckle structures, wherein an inner opening of the buckle structures is matched with the cantilever insert in a clamping way when the buckle structures are formed, the core pulling plate is attached to the bottom surface of the buckle structures, the lower side of the buckle structures is subjected to limiting pulling force of the sliding blocks when the buckle structures are released from the die and is opposite to the releasing force of the cantilever insert, and the plastic part further comprises a main body integrally connected with the buckle structures, a connecting sheet arranged below the buckle structures and a blocking strip arranged at intervals on the side edges of the buckle structures; the core pulling device is characterized in that a core pulling groove is formed between the connecting sheet and the buckle structure, the core pulling plate is correspondingly clamped with the core pulling groove, an outer opening is formed between the baffle bar and the buckle structure, a sliding groove for accommodating a sliding block is formed in the rear die, the sliding block is horizontally arranged along the sliding groove in a sliding mode, an inner cavity for accommodating the core pulling plate is formed in the sliding block, a connecting sheet is formed between the bottom surface of the core pulling plate and the inner cavity of the sliding block, a set of limiting pieces which are symmetrically arranged are arranged on the bottom surface of the connecting sheet, an inclined leaning surface is arranged on each limiting piece, and a limiting groove corresponding to the profile modeling of each limiting piece is formed in the inner cavity of the sliding block and matched with each limiting piece in a sliding clamping mode.
2. The plastic part cantilever molding anti-sticking front mold structure according to claim 1, wherein: the core pulling plate is horizontally arranged through the sliding block and is correspondingly clamped with the outer opening.
3. The plastic part cantilever molding anti-sticking front mold structure according to claim 2, wherein: and the bottom surface of the cantilever insert is matched with the bottom of the step groove in a mold and is propped against the bottom surface of the step groove.
4. The plastic part cantilever molding anti-sticking front mold structure according to claim 1, wherein: and a lower ejector column for ejecting the main body for demolding is arranged in the rear mold.
5. The plastic part cantilever molding anti-sticking front mold structure according to claim 1, wherein: the sliding edges extending to the outer side forming of the buckle structure and the outer side forming of the barrier strip are respectively arranged on two sides of the sliding block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210614449.1A CN114986817B (en) | 2022-05-31 | 2022-05-31 | Plastic part cantilever forming anti-sticking front mold method and structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210614449.1A CN114986817B (en) | 2022-05-31 | 2022-05-31 | Plastic part cantilever forming anti-sticking front mold method and structure thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114986817A CN114986817A (en) | 2022-09-02 |
| CN114986817B true CN114986817B (en) | 2023-12-05 |
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| CN202210614449.1A Active CN114986817B (en) | 2022-05-31 | 2022-05-31 | Plastic part cantilever forming anti-sticking front mold method and structure thereof |
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| Publication number | Publication date |
|---|---|
| CN114986817A (en) | 2022-09-02 |
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