CN112873710B - Injection mold - Google Patents
Injection mold Download PDFInfo
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- CN112873710B CN112873710B CN202110038303.2A CN202110038303A CN112873710B CN 112873710 B CN112873710 B CN 112873710B CN 202110038303 A CN202110038303 A CN 202110038303A CN 112873710 B CN112873710 B CN 112873710B
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- Prior art keywords
- fixing plate
- limiting needle
- limiting
- needle
- plate
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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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
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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
- B29C45/26—Moulds
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- 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 relates to an injection mold, which comprises an upper mold bottom plate, an upper mold fixing plate, an upper mold core, a lower mold core, a driving cylinder, a limiting needle fixing plate and a limiting needle, wherein the upper mold bottom plate, the upper mold fixing plate, the upper mold core and the lower mold core are fixedly connected; the limiting pin fixing plate is fixed in a plate groove of the upper die fixing plate, and the depth of the plate groove is larger than the height of the limiting pin fixing plate; one end of the limiting needle is fixedly connected with the limiting needle fixing plate, and the other end of the limiting needle can penetrate through the limiting needle fixing plate, the upper die fixing plate and the upper film core to extend into a cavity formed by matching the upper film core with the lower film core; the piston rod of the driving cylinder moves up and down and can drive the limiting needle fixing plate and the limiting needle to move up and down; the tail end of the limiting needle moves downwards before injection molding and abuts against the metal piece in the containing cavity, and moves upwards and is positioned at the upper edge of the finished product when injection molding is performed to a preset degree. The invention has the advantages that the large-scale insert can not float or shift due to the impact force of the injection of the solvent in the injection molding process, the production stability is finally increased, and the production qualification rate of the product is improved.
Description
Technical Field
The invention relates to the field of injection molding equipment, in particular to an injection mold.
Background
The traditional injection molding finished products are single plastic parts, and along with the development of technology and the change of requirements, an insert injection molding process is produced, wherein the insert injection molding is a molding process for fixing a special material insert in a proper position in an injection mold in advance, then injecting molten plastic for molding, and embedding the cooled and solidified plastic into the plastic after mold opening to obtain an integrated product with the insert such as a thread, an electrode and the like.
The insert must be well secured in the mold or it is easily displaced or deformed under the impact of the solvent. In practical use, the insert is fixed by arranging the supporting piece in the upper film core or the lower film core, but it is foreseeable that the insert is finally integrally formed with plastic and finally taken out together with a plastic finished product, if the bonding force between the insert and the supporting piece is too large, the demoulding of the final product is not easy, if the bonding force between the insert and the supporting piece is too small, the insert is easy to shift under the impact force of the solvent, so that most of the current inserts are small for small inserts such as bolts and binding posts, the contact area of the small inserts and the solvent is small, and the impact force of the received solvent is small, and the displacement is not easy.
However, when the insert is placed for multiple or large area hardware, it is difficult to say that this is largely dependent on the specific configuration of the final plastic insert product. If the finished plastic insert product contains a large-sized plate insert which is mainly used for enhancing the strength of the plastic insert, and the small-sized insert which is matched and fixed with the large-sized plate insert and exposed outside is relatively few, namely, the support points of the large-sized plate insert are relatively few, the large-sized plate insert is easy to float, shift and even expose under the impact force of the solvent without suspending the support points during injection molding, and the finished product is a defective product which is easy to shift the insert and has low production qualification rate. While the impact force of the solvent can be reduced by reducing the amount of solvent fed per unit time, this approach can significantly increase the injection cycle, thereby increasing costs.
Disclosure of Invention
In order to avoid the defects of the background technology, the invention provides the injection mold, which can fix the large-scale plate insert when the injection molding piece comprises the large-scale plate insert, so that the large-scale plate insert cannot deform, float and the like during injection molding.
The invention provides an injection mold, which comprises an upper mold bottom plate, an upper mold fixing plate, an upper mold core, a lower mold core, a driving mechanism, a limiting needle fixing plate and a limiting needle, wherein the upper mold core is arranged on the upper mold bottom plate; the upper die fixing plate is fixedly connected with the upper die bottom plate and the upper die core respectively; the top surface of the upper die fixing plate is provided with a plate groove for placing the limiting needle fixing plate, and the depth of the plate groove is larger than the height of the limiting needle fixing plate; the limiting pin fixing plate is arranged in the plate groove and can only move up and down; the limiting needle fixing plate, the upper die fixing plate and the upper film core are respectively provided with a plurality of first pinholes, second pinholes and third pinholes which are coaxial up and down; the limiting needle comprises a fixed end, a needle body and a tail end, wherein the fixed end of the limiting needle is fixedly connected with the limiting needle fixing plate, and the needle body of the limiting needle sequentially passes through the first needle hole, the second needle hole and the third needle hole; the tail end of the limiting needle can extend into a cavity formed by the cooperation of the upper membrane core and the lower membrane core; the driving mechanism is fixedly connected with the limiting needle fixing plate and can drive the limiting needle fixing plate and the limiting needle to move up and down; before injection molding, the tail end of the limiting needle moves downwards and abuts against a metal piece in the containing cavity; when the injection molding is performed to a preset degree, the tail end of the limiting needle moves upwards and is positioned at the upper edge of the finished plastic part.
Further, the upper end face of the limiting needle fixing plate is provided with a plurality of first adjusting grooves, first adjusting blocks are fixed in the first adjusting grooves, and the height of each first adjusting block is larger than the depth of each first adjusting groove.
Further, the lower end face of the limiting needle fixing plate is provided with a plurality of second adjusting grooves, second adjusting blocks are fixed in the second adjusting grooves, and the height of each second adjusting block is larger than the depth of each second adjusting groove.
Further, still include the spacer pin apron, the up end of spacer pin fixed plate has the recess that is used for placing the spacer pin apron, and the recess bottom surface has the constant head tank of placing the spacer pin stiff end, and spacer pin apron and spacer pin fixed plate fixed connection simultaneously the spacer pin apron covers the spacer pin stiff end and makes it fix in the spacer pin fixed plate.
Further, the bottom of the plate groove is provided with a plurality of positioning columns, and the limiting needle fixing plate is provided with a plurality of positioning holes matched with the positioning columns.
Preferably, the driving mechanism is a hydraulic cylinder or an electric cylinder or an air cylinder.
The injection molding device has the beneficial effects that the injection molding piece with the large-scale plate insert can be molded, and the large-scale plate insert is fixed through the limiting needle which can move up and down, so that the injection molding piece can not float or shift due to the impact force generated when the solution is injected in the injection molding process, the production stability is finally improved, and the production qualification rate of products is improved.
Drawings
Fig. 1 is an exploded perspective view of an embodiment injection mold.
Fig. 2 is a schematic cross-sectional view of an example injection mold.
Fig. 3 is a partially enlarged schematic cross-sectional view of an injection mold of an embodiment at an injection early stage.
Fig. 4 is a partially enlarged schematic cross-sectional view of an injection mold of an embodiment at an early stage of injection.
Fig. 5 is a partially enlarged schematic cross-sectional view of an injection mold of an embodiment at a later stage of injection.
Fig. 6 is a partially enlarged schematic cross-sectional view of an injection mold of an embodiment in a second shot at a later stage of injection.
The reference numerals are as follows: 10-an upper die bottom plate; 20-limiting needle fixing plates; 21-positioning holes; 30-an upper die fixing plate; 31-plate grooves; 32-positioning columns; 40-a hydraulic cylinder; 50-coating the membrane kernel; 60-falling film kernel; 70-limiting needle; 80-adjusting the block; 90-limit needle cover plate.
Detailed Description
The invention is further described below with reference to the drawings and specific examples.
1-6, an injection mold comprises an upper mold bottom plate 10, an upper mold fixing plate 30, an upper mold core 50, a lower mold core 60, a hydraulic cylinder 40, a limiting needle fixing plate 20, a limiting needle 70 and a limiting needle cover plate 90; the upper die fixing plate 30 is fixedly connected with the upper die bottom plate 10 and the upper die core 50 respectively; the top surface of the upper die fixing plate 30 is provided with a plate groove 31 penetrating through two ends and capable of placing the limiting needle fixing plate 20, and the depth of the plate groove 31 is larger than the height of the limiting needle fixing plate 20; the limiting needle fixing plate 20 is arranged in the plate groove 31, a plurality of positioning columns 32 are arranged on the bottom surface of the plate groove 31, a plurality of positioning holes 21 matched with the positioning columns 32 are formed in the limiting needle fixing plate 20, and the limiting needle fixing plate 20 can only move up and down in the plate groove 31 after being arranged; the upper end surface of the limiting needle fixing plate 20 is provided with a plurality of grooves for placing the limiting needle cover plate 90, the bottom surface of the grooves is provided with a positioning groove, and the positioning groove is internally provided with a first needle hole; the upper die fixing plate 30 and the upper die core 50 are respectively provided with a second pinhole and a third pinhole which are coaxial with the first pinhole up and down; the limiting needle 70 comprises a fixed end, a needle body and a tail end, wherein the fixed end of the limiting needle 70 is placed in a positioning groove of the limiting needle fixing plate 20, and the needle body of the limiting needle 70 sequentially passes through a first needle hole of the limiting needle fixing plate 20, a second needle hole of the upper die fixing plate 30 and a third needle hole of the upper film core 50; the tail end of the final limiting needle 70 extends into a cavity formed by the cooperation of the upper membrane core 50 and the lower membrane core 60; the limiting needle cover plate 90 is fixed in the groove of the limiting needle fixing plate 20 through a screw, and simultaneously the limiting needle 70 is covered to fix the limiting needle 70 and the limiting needle fixing plate 20 together; the two ends of the limiting needle fixing plate 20 along the length direction extend out of the plate groove 31 and are respectively fixedly connected with the piston rod of the hydraulic cylinder 40; the piston rod of the hydraulic cylinder 40 moves up and down and can drive the limiting needle fixing plate 20 and the limiting needle 70 to move up and down; when injection molding is started, the tail end of the limiting needle 70 moves downwards and abuts against the metal piece in the accommodating cavity; when the injection molding is performed to a preset degree, the tail end of the limiting needle 70 moves upwards and is positioned at the upper edge of the finished plastic part.
The concrete working principle of the injection mold of the embodiment is as follows:
before injection molding is started after die assembly, as shown in fig. 3-4, the hydraulic cylinder starts to work, and the piston rod of the hydraulic cylinder moves downwards and drives the limiting needle fixing plate 20 and the limiting needle 70 to move downwards, so that the tail end of the limiting needle 70 just abuts against and fixes the metal piece in the containing cavity, and displacement or floating of the metal piece due to impact force during injection of the solvent in the injection molding process is prevented. After injection molding is started, the solution gradually enters the cavity, and when the solution nearly fills the whole cavity, as shown in fig. 5-6, the piston rod of the hydraulic cylinder 40 moves upwards and drives the limiting needle fixing plate 20 and the limiting needle 70 to move upwards, so that the tail end of the limiting needle 70 is just positioned at the upper edge of the finished plastic part. At this time, under the action of the packing pressure, the solution quickly fills the hollow space after the limit needle 70 moves upwards, and finally the whole containing cavity is filled with the solution, so that a qualified product is achieved. After the stopper pin 70 is moved up, since the metal piece is substantially already enclosed by the solvent, the solvent to be injected later does not substantially exert a large impact force on the metal piece, in other words, the metal piece is not moved or floated substantially after the stopper pin 70 is moved up. The subsequent demolding process is the same as the prior art, and is not described here again. However, in the demolding process, the stopper pin 70 in the present embodiment may be moved downward to assist demolding, and the stopper pin 70 has a small stroke but a certain demolding effect.
The hydraulic cylinder 40 of the present embodiment is preferably an oil cylinder, and a driving cylinder such as a hydraulic cylinder, an air cylinder or an electric cylinder of other mediums may be used instead of the oil cylinder.
In this embodiment, after the injection mold is manufactured and formed, the limit position of the tail end of the injection mold is fixed, but due to the common knowledge in the manufacturing field, that is, the existence of machining errors, the position of the tail end of the limiting pin 70 in the error can not reach the effect that the lower limit position just abuts against the metal part in the cavity while the upper limit position is at the upper edge position of the finished plastic part, and the size of the related parts needs to be repeatedly modified. The upper and lower limit positions of the tail end of the limiting pin 70 depend on a plurality of factors including the length of the limiting pin 70, the depth of the plate slot 31 and the height of the limiting pin fixing plate 20, and the adjustment of these dimensions can indeed achieve the predetermined effect, but it is obvious that in the manufacturing field, there is a common sense that the larger the dimension is, the larger the machining error of the object is, that is, the difficulty of adjusting these dimensions is great, so that in order to reduce the adjustment difficulty, the implementation is as follows: lengthening the length of the limiting needle 70 during design, and machining a plurality of adjusting grooves on the upper end surface and the lower end surface of the limiting needle fixing plate 20, wherein an adjusting block 80 is fixed in each adjusting groove, and the height of the adjusting block 80 is larger than the depth of each adjusting groove; obviously, after the length of the limiting needle 70, the depth of the plate groove 31 and the height of the limiting needle fixing plate 20 are all fixed, the height of the adjusting block 80 on the upper end surface of the limiting needle fixing plate 20 is increased or reduced, so that the upper limit position of the tail end of the limiting needle 70 can be adjusted; similarly, the lower limit position of the trailing end of the stopper pin 70 can be adjusted by increasing or decreasing the height of the adjusting block 80 of the lower end surface of the stopper pin fixing plate 20.
The injection mold of the embodiment can be used for injection molding of injection molding pieces with large-scale plate inserts, and the large-scale plate inserts are fixed through the limiting pins 70 which can move up and down, so that floating or shifting can not occur due to impact force when solution is injected in the injection molding process, the production stability is finally improved, and the production qualification rate of products is improved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (4)
1. An injection mold, characterized in that: comprises an upper die bottom plate, an upper die fixing plate, an upper die core, a lower die core, a driving mechanism, a limiting needle fixing plate and a limiting needle;
the upper die fixing plate is fixedly connected with the upper die bottom plate and the upper die core respectively;
the top surface of the upper die fixing plate is provided with a plate groove for placing the limiting needle fixing plate, and the depth of the plate groove is larger than the height of the limiting needle fixing plate; the limiting pin fixing plate is arranged in the plate groove and can only move up and down;
the limiting needle fixing plate, the upper die fixing plate and the upper film core are respectively provided with a plurality of first pinholes, second pinholes and third pinholes which are coaxial up and down; the limiting needle comprises a fixed end, a needle body and a tail end, wherein the fixed end of the limiting needle is fixedly connected with the limiting needle fixing plate, and the needle body of the limiting needle sequentially passes through the first needle hole, the second needle hole and the third needle hole; the tail end of the limiting needle can extend into a cavity formed by the cooperation of the upper membrane core and the lower membrane core;
the driving mechanism is fixedly connected with the limiting needle fixing plate and can drive the limiting needle fixing plate and the limiting needle to move up and down; before injection molding, the tail end of the limiting needle moves downwards and abuts against a metal piece in the containing cavity; when the injection molding is performed to a preset degree, the tail end of the limiting needle moves upwards and is positioned at the upper edge of the finished plastic part;
the upper end face of the limiting needle fixing plate is provided with a plurality of first adjusting grooves, first adjusting blocks are fixed in the first adjusting grooves, and the height of each first adjusting block is larger than the depth of each first adjusting groove;
the lower end face of the limiting needle fixing plate is provided with a plurality of second adjusting grooves, second adjusting blocks are fixed in the second adjusting grooves, and the height of each second adjusting block is larger than the depth of each second adjusting groove.
2. An injection mold according to claim 1, wherein: still include the spacer pin apron, the up end of spacer pin fixed plate has the recess that is used for placing the spacer pin apron, the recess bottom surface has the constant head tank of placing the spacer pin stiff end, the spacer pin apron with spacer pin fixed plate fixed connection simultaneously the spacer pin apron covers the spacer pin stiff end makes it fix in the spacer pin fixed plate.
3. An injection mold according to claim 1, wherein: the bottom of the plate groove is provided with a plurality of positioning columns, and the limiting needle fixing plate is provided with a plurality of positioning holes matched with the positioning columns.
4. An injection mold according to claim 1, wherein: the driving mechanism is a hydraulic cylinder or an electric cylinder or an air cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110038303.2A CN112873710B (en) | 2021-01-12 | 2021-01-12 | Injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110038303.2A CN112873710B (en) | 2021-01-12 | 2021-01-12 | Injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112873710A CN112873710A (en) | 2021-06-01 |
| CN112873710B true CN112873710B (en) | 2023-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110038303.2A Active CN112873710B (en) | 2021-01-12 | 2021-01-12 | Injection mold |
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| CN (1) | CN112873710B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114193704A (en) * | 2021-12-20 | 2022-03-18 | 江苏骏伟精密部件科技股份有限公司 | Different-stroke core-pulling needle control device for injection mold |
| CN114589876A (en) * | 2022-02-25 | 2022-06-07 | 歌尔股份有限公司 | Thermoplastic body injection mold and injection molding method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014000886A1 (en) * | 2012-06-28 | 2014-01-03 | Arslandogdu Ismail | Auxiliary injection mould for the injection-moulding of hollow plastics bodies |
| CN105711040A (en) * | 2016-02-24 | 2016-06-29 | 南京华顺精密模具有限公司 | Injection mold for filter screen |
| CN208714332U (en) * | 2018-08-09 | 2019-04-09 | 三威实业（珠海）有限公司 | Injection mold |
| CN111231243A (en) * | 2020-02-12 | 2020-06-05 | 东莞力浦精密电子有限公司 | Injection mold |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203141788U (en) * | 2013-02-28 | 2013-08-21 | 长城汽车股份有限公司 | Adjustable ejector rod structure for injection mold |
| CN204354398U (en) * | 2014-12-18 | 2015-05-27 | 英瑟泰科精密注塑（苏州）有限公司 | A kind of metal insert injection mold with floating pilot pin |
| DE102015114270A1 (en) * | 2015-08-27 | 2017-03-02 | Illinois Tool Works Inc. | Injection molding component, joint, injection molding apparatus and method for producing an injection-molded component |
-
2021
- 2021-01-12 CN CN202110038303.2A patent/CN112873710B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014000886A1 (en) * | 2012-06-28 | 2014-01-03 | Arslandogdu Ismail | Auxiliary injection mould for the injection-moulding of hollow plastics bodies |
| CN105711040A (en) * | 2016-02-24 | 2016-06-29 | 南京华顺精密模具有限公司 | Injection mold for filter screen |
| CN208714332U (en) * | 2018-08-09 | 2019-04-09 | 三威实业（珠海）有限公司 | Injection mold |
| CN111231243A (en) * | 2020-02-12 | 2020-06-05 | 东莞力浦精密电子有限公司 | Injection mold |
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| CN112873710A (en) | 2021-06-01 |
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