CN116175907A - Back-off structure for forced demolding, injection mold and injection molding method - Google Patents
Back-off structure for forced demolding, injection mold and injection molding method Download PDFInfo
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- CN116175907A CN116175907A CN202211732541.4A CN202211732541A CN116175907A CN 116175907 A CN116175907 A CN 116175907A CN 202211732541 A CN202211732541 A CN 202211732541A CN 116175907 A CN116175907 A CN 116175907A
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- cavity
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- forced demolding
- injection molding
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- 238000002347 injection Methods 0.000 title claims abstract description 20
- 239000007924 injection Substances 0.000 title claims abstract description 20
- 238000001746 injection moulding Methods 0.000 title claims abstract description 19
- 239000000463 material Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 239000012778 molding material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 230000005489 elastic deformation Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
-
- 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
- B29C45/2602—Mould construction elements
-
- 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
- B29C2045/4492—Removing or ejecting moulded articles for undercut articles preventing damage or deformation of undercut articles during ejection
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention provides an inverted structure for forced demolding, an injection mold and an injection molding method, comprising an inverted cavity and an opening of the inverted structure, wherein the inverted cavity is communicated with the opening of the inverted structure, and a concave is formed on the side wall of the inverted cavity adjacent to the opening of the inverted structure; an R angle is connected between the opening of the back-off structure and the outer wall of the back-off cavity, and a clockwise included angle between the central axis of the back-off cavity and the outer wall of the back-off cavity adjacent to the opening of the back-off structure is at least 45 degrees. Through setting up the central axis in back-off chamber and the clockwise contained angle between the outer wall in back-off chamber that back-off structure opening is adjacent at least 45, when making ejecting, the back-off volume of back-off chamber and the deformation space that back-off structure opening adjacent outer wall department formed is greater than the back-off volume of back-off intracavity concave part to synchronous natural formation can tolerate the space of product deformation, thereby accomplish under the condition of tiny or not changing the outward appearance and force the drawing of patterns, and mould simple structure, with low costs, reliable and practical of production.
Description
Technical Field
The invention relates to the technical field of injection molds, in particular to an inverted buckle structure for forced demolding, an injection mold and an injection molding method.
Background
In plastic molds, the material used is ABS or PC. Along with the development of technology, the structural design of injection products is more and more complex, and if the generated demolding direction has back-off, demolding is difficult, and maintenance risk is high during production.
At present, products with back-off in the demolding direction can be ejected by a second time, a deformation space is reserved, and the products are ejected to strongly release the back-off, but the structure is complex. And a deformation space can be reserved after the action is opened, the product is ejected out to be strongly released and inverted, but the action occupies too large mold space, the number of mold cavities is reduced, and the production cost is increased.
The prior Chinese patent application document with the publication number of CN106378912A discloses an injection mold with a forced demolding structure, which comprises that a movable core is gradually separated from a product plastic part between a supporting plate and a movable template in the first mold opening process, so that a space for forced demolding and inward elastic deformation is provided for a second back-off; further, the pushing plate and the fixed template are separated in opposite directions, the pushing plate and the fixed template are opened, and the sliding block performs lateral core pulling on the product plastic part; after the lateral core pulling is finished, the pushing piece bottom plate is pushed to push the pushing plate to leave the movable templates to move in opposite directions, so that the movable templates of the pushing plate are opened at the moment, the movable mold core is separated from the product plastic piece, and the movable mold core is separated from the product plastic piece, so that an inward elastic deformation space is provided for forced demolding of the first back-off; meanwhile, the movable mould insert on the push plate ejects the product plastic part along with the movement of the push plate, so that the forced demoulding of the product plastic part is completed.
The forced demolding structure in the prior art leaves an inward elastic deformation space, then the product is ejected out to be strongly released and reversely buckled, the mold opening is difficult, the inner side of some products is a functional position, the inward elastic deformation space cannot be left, and the space exists to be improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an inverted buckle structure for forced demolding, an injection mold and an injection molding method.
The invention provides an inverted structure for forced demolding, which comprises an inverted cavity and an opening of the inverted structure, wherein the inverted cavity is communicated with the opening of the inverted structure, and a concave is formed on the side wall of the inverted cavity adjacent to the opening of the inverted structure; an R angle is connected between the opening of the back-off structure and the outer wall of the back-off cavity, and a clockwise included angle between the central axis of the back-off cavity and the outer wall of the back-off cavity adjacent to the opening of the back-off structure is at least 45 degrees.
Preferably, the maximum thickness difference between the recess and the opening of the back-off structure is 0.1-0.2mm.
Preferably, the angle of the clockwise included angle between the central axis of the back-off cavity and the inner concave side wall is smaller than or equal to the angle of the clockwise included angle between the central axis of the back-off cavity and the outer wall of the back-off cavity adjacent to the opening of the back-off structure.
Preferably, the R angle is as large as possible under the premise of meeting the concave amount and the clockwise included angle between the central axis of the back-off cavity and the outer wall of the back-off cavity adjacent to the opening of the back-off structure.
Preferably, during ejection, the deformation space formed at the outer wall of the back-off cavity adjacent to the back-off structure opening is larger than the back-off quantity of the concave part in the back-off cavity.
Preferably, the back-off structure comprises an inner back-off or an outer back-off.
The injection mold for forced demolding provided by the invention further comprises a pouring gate and an injection runner, wherein the injection runner is communicated with the pouring gate and an opening of the back-off structure.
According to the injection molding method for forced demolding provided by the invention, the injection molding method comprises the following steps of:
s1, after die assembly, injection molding filling is carried out, so that the material level is fully filled;
s2, carrying out ejection after pressure maintaining and cooling, thereby completing demoulding.
Preferably, the injection molding material comprises ABS or POM.
Preferably, for the S2, when the ejection action is performed, the deformation space formed at the outer wall of the back-off cavity adjacent to the opening of the back-off structure is larger than the back-off amount of the concave part in the back-off cavity.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the clockwise included angle between the central axis of the back-off cavity and the outer wall of the back-off cavity adjacent to the back-off structure opening is at least 45 degrees, so that the deformation space formed at the position of the back-off cavity adjacent to the back-off structure opening is larger than the back-off quantity of the concave part in the back-off cavity during ejection, thereby synchronously and naturally forming a space capable of allowing the deformation of a product, and further, the forced demolding is completed under the condition of slightly or not changing the appearance.
2. According to the invention, through the R angle connected between the opening of the back-off structure and the outer wall of the back-off cavity, the pull injury during forced demolding deformation can be reduced, and the quality of injection molding products can be improved.
3. The invention is beneficial to improving the convenience of demoulding by setting the clockwise included angle between the central axis of the back-off cavity and the inner concave side wall to be smaller than or equal to the clockwise included angle between the central axis of the back-off cavity and the outer wall of the back-off cavity adjacent to the opening of the back-off structure.
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 view of an inner back-off type back-off structure embodying the present invention;
FIG. 2 is a schematic view of an external back-off type back-off structure according to the present invention;
FIG. 3 is a schematic view of an ejection structure of the invention, which mainly shows that a product is ejected by 0.1 mm;
fig. 4 is a schematic diagram of an ejection structure of the invention, which mainly shows that a product is ejected by 0.4 mm.
The figure shows: 1. concave; 2. r angle.
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.
As shown in fig. 1 and 2, the back-off structure for forced demolding according to the present invention includes a back-off cavity and an opening of the back-off structure, wherein the back-off cavity is communicated with the opening of the back-off structure, and a concave 1 is formed on a side wall of the back-off cavity adjacent to the opening of the back-off structure. An R angle 2 is connected between the opening of the back-off structure and the outer wall of the back-off cavity, and the clockwise included angle between the central axis of the back-off cavity and the outer wall of the back-off cavity adjacent to the opening of the back-off structure is at least 45 degrees.
The clockwise included angle between the central axis of the back-off cavity and the outer wall of the back-off cavity adjacent to the back-off structure opening is C, the clockwise included angle between the central axis of the back-off cavity and the side wall of the indent 1 is B, and the angle of B is smaller than or equal to the angle of C. And the larger the angle of C, the more favorable the demolding.
Specifically, the maximum thickness difference between the recess 1 and the opening of the back-off structure is 0.1-0.2mm. The size of the R angle 2 is as large as possible under the premise of meeting the requirement of 1 amount of concave, and the clockwise included angle between the central axis of the back-off cavity and the outer wall of the back-off cavity adjacent to the opening of the back-off structure. Thereby avoiding the strain during the strong detachment and deformation.
During ejection, the deformation space formed at the outer wall of the back-off cavity adjacent to the back-off structure opening is larger than the back-off quantity at the concave 1 position of the back-off cavity. Therefore, a space capable of allowing deformation of the product can be formed synchronously and naturally, and the problem of demolding of the back-off is solved.
Further, the back-off structure includes an inner back-off or an outer back-off. The demolding principle of the inner back-off and the outer back-off are the same, and the inner back-off structure is taken as an example for explanation, and the inner back-off of the application preferably adopts the inner back-off of a C-shaped structure.
The invention further provides an injection mold for forced demolding, which comprises the back-off structure for forced demolding, and further comprises a pouring gate and an injection runner, wherein the injection runner is communicated with the pouring gate and an opening of the back-off structure. After the front mould and the rear mould are assembled, injection filling can be carried out through the pouring gate and the injection runner.
The invention also provides an injection molding method for forced demolding, which adopts the forced demolding reverse buckling structure and the forced demolding injection mold, and comprises the following steps:
s1, after die assembly, injection molding filling is carried out, so that the material level is fully filled;
s2, carrying out ejection after pressure maintaining and cooling, thereby completing demoulding. And (2) when the ejection action is carried out, the deformation space formed at the outer wall of the back-off cavity adjacent to the opening of the back-off structure is larger than the back-off quantity at the concave 1 of the back-off cavity.
The injection molding material comprises ABS or POM.
As shown in FIG. 3, in the ejection process, the product is ejected by 0.1mm, the back-off amount at the concave 1 position of the back-off structure is 0.05mm, and the deformation space formed at the outer wall of the back-off cavity adjacent to the opening of the back-off structure is 0.06mm, so that the product has enough deformation space in the forced ejection process.
As shown in fig. 4, the product is continuously ejected by 0.4mm, the back-off amount at the concave 1 position of the back-off structure is 0.13mm, and the deformation space formed at the outer wall of the back-off cavity adjacent to the opening of the back-off structure is 0.23mm, so that the product has enough deformation space in the forced ejection process. Therefore, forced demolding can be completed under the condition of tiny or unchanged appearance, so that the mold is simple in structure, low in cost and reliable and practical in production.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present application.
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 or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (10)
1. The back-off structure for forced demolding is characterized by comprising a back-off cavity and an opening of the back-off structure, wherein the back-off cavity is communicated with the opening of the back-off structure, and a concave (1) is formed on the side wall of the back-off cavity adjacent to the opening of the back-off structure;
an R angle (2) is connected between the opening of the back-off structure and the outer wall of the back-off cavity, and the clockwise included angle between the central axis of the back-off cavity and the outer wall of the back-off cavity adjacent to the opening of the back-off structure is at least 45 degrees.
2. The back-off structure for forced demolding according to claim 1, characterized in that the maximum thickness difference between the recess (1) and the opening of the back-off structure is 0.1-0.2mm.
3. The back-off structure for forced demolding according to claim 1, wherein an angle of a clockwise included angle between a central axis of the back-off cavity and a side wall of the recess (1) is smaller than or equal to an angle of a clockwise included angle between a central axis of the back-off cavity and an outer wall of the back-off cavity adjacent to the back-off structure opening.
4. The back-off structure for forced demolding according to claim 1, wherein the R angle (2) is as large as possible under the premise of satisfying the amount of the concave (1) and the clockwise included angle between the central axis of the back-off cavity and the outer wall of the back-off cavity adjacent to the opening of the back-off structure.
5. The back-off structure for forced demolding according to claim 1, wherein the deformation space formed at the outer wall of the back-off cavity adjacent to the back-off structure opening is larger in size than the back-off amount at the concave (1) of the back-off cavity during ejection.
6. The back-off structure for forced demolding according to claim 1, wherein the back-off structure comprises an inner back-off or an outer back-off.
7. An injection mold for forced demolding, comprising the back-off structure for forced demolding according to any one of claims 1 to 6, further comprising a gate and an injection runner, the injection runner communicating with the gate and an opening of the back-off structure.
8. An injection molding method for forced demolding, characterized in that the inverted structure for forced demolding according to any one of claims 1 to 6 is employed, the injection molding method comprising the steps of:
s1, after die assembly, injection molding filling is carried out, so that the material level is fully filled;
s2, carrying out ejection after pressure maintaining and cooling, thereby completing demoulding.
9. The injection molding method for forced demolding according to claim 8, wherein the injection molding material comprises ABS or POM.
10. The injection molding method for forced demolding according to claim 8, wherein, for S2, the deformation space formed at the outer wall of the back-off cavity adjacent to the opening of the back-off structure is larger in size than the back-off amount at the recess (1) of the back-off cavity when the ejection action is performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211732541.4A CN116175907A (en) | 2022-12-30 | 2022-12-30 | Back-off structure for forced demolding, injection mold and injection molding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211732541.4A CN116175907A (en) | 2022-12-30 | 2022-12-30 | Back-off structure for forced demolding, injection mold and injection molding method |
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| Publication Number | Publication Date |
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| CN116175907A true CN116175907A (en) | 2023-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211732541.4A Pending CN116175907A (en) | 2022-12-30 | 2022-12-30 | Back-off structure for forced demolding, injection mold and injection molding method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117621374A (en) * | 2024-01-25 | 2024-03-01 | 宁波天龙电子股份有限公司 | Mould for preparing plastic product with concave back-off component |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101954722A (en) * | 2010-09-15 | 2011-01-26 | 宁海瑞元模塑有限公司 | Delay forced de-molding mechanism of injection mold |
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2022
- 2022-12-30 CN CN202211732541.4A patent/CN116175907A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101954722A (en) * | 2010-09-15 | 2011-01-26 | 宁海瑞元模塑有限公司 | Delay forced de-molding mechanism of injection mold |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117621374A (en) * | 2024-01-25 | 2024-03-01 | 宁波天龙电子股份有限公司 | Mould for preparing plastic product with concave back-off component |
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