CN117245865A - An ejection structure dedicated to small undercuts on products - Google Patents
An ejection structure dedicated to small undercuts on products Download PDFInfo
- Publication number
- CN117245865A CN117245865A CN202311007146.4A CN202311007146A CN117245865A CN 117245865 A CN117245865 A CN 117245865A CN 202311007146 A CN202311007146 A CN 202311007146A CN 117245865 A CN117245865 A CN 117245865A
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- China
- Prior art keywords
- sliding
- ejector rod
- sliding block
- ejector
- product
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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
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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 discloses a special ejection structure for small back-off on a product, which comprises an ejector plate, an ejector rod and a limiting slide block, wherein a product molding inner die is arranged on a fixed die of a molding die, and a through upper sliding cavity is arranged in the product molding inner die; the limiting slide block is arranged in the upper sliding cavity after being matched with the ejector rod, one side of the upper part of the limiting slide block is provided with a small back-off forming groove, and the small back-off forming groove, the upper end part of the ejector rod and the product forming inner die jointly enclose a small back-off forming cavity. The ejector rod is provided with the sliding groove towards one side of the limit sliding block, and one side of the limit sliding block towards the ejector rod is provided with the protruding sliding block matched with the sliding groove, and the protruding sliding block is embedded into the sliding groove corresponding to the ejector rod in a sliding manner. The lower end of the ejector rod sequentially passes through the fixed die and the ejector plate from top to bottom and is fixed at the bottom of the ejector plate. The invention has simple structure and does not influence the layout design of the whole die; and the design of this structure has pertinency, is mainly applicable to the condition that the back-off is measured little, ejection stroke is little, can effectively accomplish the back-off drawing of patterns, promotes the quality of product.
Description
Technical Field
The invention relates to the technical field of injection mold forming, in particular to an ejection structure special for small back-off on a product.
Background
With the rapid development of the plastic industry, various tools and products used in daily production and life, such as ships, automobiles, screws, buttons and shells of various household appliances, are not closely related to plastic products. Injection molds are important process equipment for producing various plastic industrial products, and are also tools for endowing plastic products with complete structures and precise dimensions. Injection molding is a processing method used for mass production of parts with complex shapes, and specifically refers to that heated and melted plastic is injected into a mold cavity formed by buckling a movable mold and a fixed mold through an injection molding machine at high pressure, and a formed product is obtained after cooling and solidification. In the production and processing process, the diversity design of the products enables certain products to be provided with a small back-off structure at a certain specific position when being molded, as shown in the products in fig. 1 and 2, the molding of the small back-off structure is often unique, so that the blocking and blocking phenomenon is generated in the demolding process of the products, the whole products are damaged when being demolded, and the quality of the whole products is affected; in addition, in the prior art, aiming at the demolding of the small back-off, the setting composition of the mold is often complex, the demolding process is complex, the molding efficiency of the product is affected, and the cost is increased.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a special ejection structure for small back-off on a product.
In order to solve the technical problems, the invention adopts the following technical scheme: the ejection structure is specially used for small back-off on a product and is arranged on the side of a fixed die of an injection mold, and comprises an ejector plate, an ejector rod and a limiting slide block, wherein a product forming inner die is arranged on the fixed die, and an upper sliding cavity penetrating through the product forming inner die is arranged on the product forming inner die; a small back-off forming groove is formed in one side of the upper part of the limiting slide block, the small back-off forming groove is matched with the ejector rod and then is arranged in the upper sliding cavity, and the upper end part of the ejector rod, the limiting slide block and the product forming inner die jointly enclose a small back-off forming cavity on the product; the fixed die is correspondingly provided with a sliding through hole, the lower end of the limiting sliding block extends into the top of the sliding through hole, and the lower end of the ejector rod sequentially penetrates through the fixed die and the ejector plate from top to bottom and is fixed at the bottom of the ejector plate; the ejector pin plate is connected with a bottom plate positioned below the fixed die through a supporting block.
The ejector rod is provided with two mutually parallel sliding grooves at intervals on one side of the ejector rod facing the limiting sliding block, two protruding sliding blocks matched with the sliding grooves are arranged on the lower part of one side of the limiting sliding block facing the ejector rod, and the two protruding sliding blocks are respectively embedded and installed in the corresponding sliding grooves.
Further, the limit sliding block consists of an upper half part and a lower half part, wherein the longitudinal section of the upper half part is of an inverted trapezoid structure, and the longitudinal section of the lower half part is of a parallelogram structure, and the upper half part and the lower half part are integrally formed; the top surface level of the upper half of spacing slider sets up, and there is the contained angle between the hypotenuse of lower half and the high extension line of the inverted trapezium structure of upper half, and its inclination is 20 ~ 30.
Further, the upper sliding cavity comprises a push rod sliding cavity and a sliding block sliding cavity which are mutually communicated, wherein the push rod sliding cavity is of a straight vertical barrel structure; the sliding cavity of the sliding block is matched with the limiting sliding block, the upper end of the sliding block is of an inverted trapezoid column shape, and the lower end of the sliding block is of an inclined column shape.
Further, the upper sliding through hole of the fixed die is divided into a limit sliding block part and a push rod part which are communicated with each other, and the width of the limit sliding block part is larger than that of the lower end of the limit sliding block; the ejector rod part penetrates through the fixed die.
Further, a thimble is arranged in the ejector rod, and the upper end of the thimble extends out from the top end of the ejector rod to the product forming cavity.
Further, the sliding groove arranged on the ejector rod is parallel to the upper surface of the ejector plate.
Compared with the prior art, the invention has the following beneficial effects: the invention has simple structure, does not influence the layout design of the whole mould, does not occupy space and saves cost; the structure of the invention has pertinence, is mainly suitable for the conditions of small back-off amount and small ejection stroke, can effectively finish back-off demolding, prevent product damage and improve the quality of molded products.
Drawings
FIG. 1 is a schematic structural view of a molded product;
FIG. 2 is an enlarged view of the bottom reverse position of the molded product;
FIG. 3 is a schematic diagram of the overall structure of the present invention;
FIG. 4 is a front side view of the structure of the present invention;
FIG. 5 is a diagram showing the matching relationship between the ejector rod and the limit slider in the present invention;
FIG. 6 is a schematic view of a sliding cavity on an inner mold for molding a product according to the present invention;
FIG. 7 is a schematic view of a push rod according to the present invention;
FIG. 8 is a schematic diagram of a limit slider according to the present invention;
FIG. 9 is a diagram showing the mounting relationship between the limit slider and the fixed mold in the present invention;
in the figure: 1. the molding product comprises a molded product, 11 parts of small back-off, 2 parts of fixed mold, 21 parts of sliding through holes, 3 parts of a product molding inner mold, 31 parts of an upper sliding cavity, 4 parts of ejector rods, 41 parts of sliding grooves, 42 parts of ejector pins, 5 parts of limiting sliding blocks, 51 parts of upper sliding block half parts, 52 parts of lower sliding block half parts, 53 parts of small back-off molding grooves, 54 parts of protruding sliding blocks, 6 parts of ejector pins, 7 parts of bottom plates, 8 parts of supporting blocks and 9 parts of positioning end blocks.
Detailed Description
It should be noted that, in the description of the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and relational terms are merely determined to facilitate description of structural relationships of the components of the present invention, and do not particularly denote that any one of the components of the present invention must have a specific orientation, be configured and operated in a specific orientation, and should not be construed as limiting the present invention.
It should be further noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings:
as shown in fig. 1 and fig. 2, according to the actual production and processing requirements of the product, a small back-off 11 is arranged at the bottom of the molded product 1, the small back-off 11 is arranged on a thin wall, and the demolding stroke of the position where the small back-off 11 is located is smaller, so that an ejection structure special for the small back-off on the product is provided, and the ejection structure is arranged on the side of a fixed die of an injection mold and comprises an ejector plate 6, an ejector rod 4 and a limiting slide block 5, as shown in fig. 3 to fig. 9. The upper surface of a fixed die 2 of the product forming injection mold is inwards recessed to form an inner cavity, a product forming inner die 3 is arranged in the inner cavity, a product forming cavity is arranged on the product forming inner die 3, meanwhile, an upper sliding cavity 31 penetrating through the upper dimension and the lower dimension of the product forming inner die 3 is arranged at a designated position of the product forming inner die 3 according to a forming design, and the upper sliding cavity 31 is divided into two parts, namely a push rod sliding cavity and a sliding block sliding cavity, which are mutually communicated to form a cavity, wherein the push rod sliding cavity is of a straight upper and lower vertical cylindrical structure, the upper end of the sliding block sliding cavity is of an inverted trapezoid column shape, and the lower end of the sliding block sliding cavity is of an inclined column structure; the ejector rod 4 and the limit sliding block 5 are mutually matched and then are arranged in the upper sliding cavity 31, wherein the upper end surface of the limit sliding block 5 is flush with the bottom surface of the product forming inner die 3. Corresponding to the arrangement of the upper sliding cavity 31, a sliding through hole 21 penetrating through the fixed die 2 is arranged on the fixed die 2, and as shown in fig. 9, the lower end of the limit sliding block 5 extends into the sliding through hole 21 and is accommodated at the top of the sliding through hole 21, and the lower end of the ejector rod 4 sequentially penetrates through the fixed die 2, the ejector plate 6 positioned below the fixed die 2 from top to bottom and is fixed at the bottom of the ejector plate 6 through countersunk bolts; and meanwhile, a positioning end block 9 is fixedly arranged at the bottom of the sliding through hole 21, and the positioning end block 9 is sleeved on the ejector rod 4 to limit and fix the ejector rod 4, so that the ejector rod 4 can stably slide up and down along the longitudinal central line of the ejector rod. The thimble plate 6 is connected with the bottom plate positioned below the thimble plate through two supporting blocks 8.
Referring to fig. 7, two parallel sliding grooves 41 are formed at intervals on the upper part of one side of the ejector rod 4 facing the limit slider 5, and the arrangement direction of the sliding grooves 41 is parallel to the upper surface of the ejector plate 6; meanwhile, a thimble 42 is arranged in the ejector rod 4, and the upper end of the thimble 42 extends out from the top end of the ejector rod 4 and extends to the product forming cavity.
Referring to fig. 8, the limit sliding block 5 includes a sliding block upper half 51 and a sliding block lower half 52, wherein the longitudinal section of the sliding block upper half 51 is in an inverted trapezoid structure, the upper part is wide at the top and narrow at the bottom, and a small inverted buckle forming groove 53 is arranged on the side of the sliding block upper half 51 facing the ejector rod 4; the longitudinal section of the lower half part 52 of the sliding block is in a parallelogram structure and is positioned below the upper half part 51 of the sliding block, and the two parts are integrally formed; when the top surface of the upper half 51 of the limiting slide 5 is horizontally arranged, an included angle exists between the inclined edge of the lower half 52 of the slide and the high extension line of the inverted trapezoid structure of the upper half 51 of the slide, and the inclined angle is 20-30 degrees, so that a specific shape is formed. Two protruding sliding blocks 54 are arranged at parallel intervals on one side of the lower end part of the sliding block lower half part 52 facing the ejector rod 4, the two protruding sliding blocks 54 are matched with the two sliding grooves 41 arranged on the ejector rod 4, and are respectively embedded into the corresponding sliding grooves 41 in a sliding manner, so that the limiting sliding blocks 5 and the ejector rod 4 are assembled, and at the moment, the upper end part of the ejector rod 4, the upper sliding block half part 51 of the limiting sliding blocks 5 and the product forming internal mold 3 jointly enclose an injection molding cavity of the small upper inverted buckle 11 of the product.
Further, the upper sliding through hole 21 of the fixed mold 2 is divided into a limit sliding block part and a push rod part, which are mutually communicated, wherein the width of the limit sliding block part is larger than that of the lower end of the limit sliding block 5.
When demoulding is carried out after injection molding is finished, firstly the molded product 1 is synchronously ejected under the action of the corresponding ejector pin and ejector rod in the mould, wherein the ejector rod 4 in the ejection structure is also ejected upwards to drive the matched limit sliding block 5 to be synchronously ejected upwards, the limit sliding block 5 is limited by the position of the inclined column-shaped structure of the sliding block sliding cavity in the upper sliding cavity 31, the limit sliding block 5 slides relatively rightwards along the sliding groove 41 on the ejector rod 4, the small back-off 11 slides out of the small back-off molding groove 53, the back-off demoulding action is finished, the integrity of the product is ensured, and the quality of the product is improved.
The technical scheme described in the above embodiments has related technical features that are not mentioned yet, and the related technical features can be realized by adopting or referring to the prior art.
It should be understood that the above description is not intended to limit the invention to the particular embodiments disclosed, but to limit the invention to the particular embodiments disclosed, and that the invention is not limited to the particular embodiments disclosed, but is intended to cover modifications, adaptations, additions and alternatives falling within the spirit and scope of the invention.
Claims (6)
1. The utility model provides a little flip-flop's ejecting structure on product is exclusively used in, sets up in injection mold's cover half side, its characterized in that: the device comprises an ejector pin plate, an ejector pin and a limiting slide block, wherein a product forming internal mold is arranged on the fixed mold, and an upper sliding cavity penetrating through the product forming internal mold is arranged on the product forming internal mold; a small back-off forming groove is formed in one side of the upper part of the limiting slide block, the small back-off forming groove is matched with the ejector rod and then is arranged in the upper sliding cavity, and the upper end part of the ejector rod, the limiting slide block and the product forming inner die jointly enclose a small back-off forming cavity on the product; the fixed die is correspondingly provided with a sliding through hole, the lower end of the limiting sliding block extends into the top of the sliding through hole, and the lower end of the ejector rod sequentially penetrates through the fixed die and the ejector plate from top to bottom and is fixed at the bottom of the ejector plate; the ejector pin plate is connected with a bottom plate positioned below the fixed die through a supporting block;
the ejector rod is provided with two mutually parallel sliding grooves at intervals on one side of the ejector rod facing the limiting sliding block, two protruding sliding blocks matched with the sliding grooves are arranged on the lower part of one side of the limiting sliding block facing the ejector rod, and the two protruding sliding blocks are respectively embedded and installed in the corresponding sliding grooves.
2. The ejection structure special for small back-off on a product according to claim 1, wherein: the limiting slide block consists of an upper half part and a lower half part, wherein the longitudinal section of the upper half part is of an inverted trapezoid structure, and the longitudinal section of the lower half part is of a parallelogram structure, and the upper half part and the lower half part are integrally formed; the top surface level of the upper half of spacing slider sets up, and there is the contained angle between the hypotenuse of lower half and the high extension line of the inverted trapezium structure of upper half, and its inclination is 20 ~ 30.
3. The ejection structure special for small back-off on products according to claim 2, wherein: the upper sliding cavity comprises a push rod sliding cavity and a sliding block sliding cavity which are mutually communicated, wherein the push rod sliding cavity is of a straight vertical barrel-shaped structure; the sliding cavity of the sliding block is matched with the limiting sliding block, the upper end of the sliding block is of an inverted trapezoid column shape, and the lower end of the sliding block is of an inclined column shape.
4. A special ejection structure for small back-off on products according to claim 3, characterized in that: the upper sliding through hole of the fixed die is divided into a limit sliding block part and a push rod part which are communicated with each other, and the width of the limit sliding block part is larger than that of the lower end of the limit sliding block; the ejector rod part penetrates through the fixed die.
5. The ejection structure special for small back-off on a product according to claim 1, wherein: the ejector rod is internally provided with an ejector pin, and the upper end of the ejector pin extends out from the top end of the ejector rod to the product forming cavity.
6. The ejection structure special for small back-off on a product according to claim 1, wherein: the sliding groove arranged on the ejector rod is parallel to the upper surface of the ejector pin plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311007146.4A CN117245865A (en) | 2023-08-11 | 2023-08-11 | An ejection structure dedicated to small undercuts on products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311007146.4A CN117245865A (en) | 2023-08-11 | 2023-08-11 | An ejection structure dedicated to small undercuts on products |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117245865A true CN117245865A (en) | 2023-12-19 |
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ID=89125489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311007146.4A Pending CN117245865A (en) | 2023-08-11 | 2023-08-11 | An ejection structure dedicated to small undercuts on products |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117245865A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119704474A (en) * | 2025-01-14 | 2025-03-28 | 青岛海泰科模具有限公司 | Demoulding ejector rod of multilayer back-off structure at radar hole |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104985775A (en) * | 2015-07-22 | 2015-10-21 | 台州黄岩艾彼模具有限公司 | Straight-ejecting, oblique-slipping and core-pulling synchronously combined sliding block mechanism of injection mold |
| CN208263344U (en) * | 2018-05-17 | 2018-12-21 | 华域视觉科技(上海)有限公司 | The straight mandril angle ejector rod of injection mold combines demoulding mechanism |
| CN208714399U (en) * | 2018-07-31 | 2019-04-09 | 三威实业（珠海）有限公司 | Injection mold |
| CN211763195U (en) * | 2019-12-26 | 2020-10-27 | 欧唐科技（深圳）有限公司 | A Simple Large Inverted Buckle Inclined Sliding Ejector Mechanism |
| CN114434757A (en) * | 2022-01-27 | 2022-05-06 | 青岛海泰科模具有限公司 | Mold for demolding of large-angle reverse buckle |
-
2023
- 2023-08-11 CN CN202311007146.4A patent/CN117245865A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104985775A (en) * | 2015-07-22 | 2015-10-21 | 台州黄岩艾彼模具有限公司 | Straight-ejecting, oblique-slipping and core-pulling synchronously combined sliding block mechanism of injection mold |
| CN208263344U (en) * | 2018-05-17 | 2018-12-21 | 华域视觉科技(上海)有限公司 | The straight mandril angle ejector rod of injection mold combines demoulding mechanism |
| CN208714399U (en) * | 2018-07-31 | 2019-04-09 | 三威实业（珠海）有限公司 | Injection mold |
| CN211763195U (en) * | 2019-12-26 | 2020-10-27 | 欧唐科技（深圳）有限公司 | A Simple Large Inverted Buckle Inclined Sliding Ejector Mechanism |
| CN114434757A (en) * | 2022-01-27 | 2022-05-06 | 青岛海泰科模具有限公司 | Mold for demolding of large-angle reverse buckle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119704474A (en) * | 2025-01-14 | 2025-03-28 | 青岛海泰科模具有限公司 | Demoulding ejector rod of multilayer back-off structure at radar hole |
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