CN112873710A - Injection mold - Google Patents
Injection mold Download PDFInfo
- Publication number
- CN112873710A CN112873710A CN202110038303.2A CN202110038303A CN112873710A CN 112873710 A CN112873710 A CN 112873710A CN 202110038303 A CN202110038303 A CN 202110038303A CN 112873710 A CN112873710 A CN 112873710A
- Authority
- CN
- China
- Prior art keywords
- needle
- fixing plate
- limiting
- plate
- limiting needle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- B29C45/14—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
Abstract
The invention relates to an injection mold, which comprises an upper mold base 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 base 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 greater 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 membrane kernel and extend into a containing cavity formed by matching the upper membrane kernel and the lower membrane kernel; a 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 cavity, and moves upwards when the injection molding reaches a preset degree and is positioned at the upper edge of a finished product. The invention has the advantages that the large-scale plate insert can not float or shift due to the impact force generated when the molten material is injected in the injection molding process, the production stability is finally increased, and the production qualified rate of products 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 created, wherein the insert injection molding process is a molding process for fixing a special-material insert at a proper position in an injection mold in advance, then injecting molten plastic for molding, and after the mold is opened, the insert is tightly wrapped and embedded in the plastic by the cooled and solidified plastic to obtain an integrated product with inserts such as threads, electrodes and the like.
The insert must be well fixed in the mold or it is easily displaced or deformed by the impact of the melt. In actual use, the insert is necessarily 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 is finally taken out of the mold together with a plastic finished product, the demolding of the final product is not easy if the combining force of the insert and the supporting piece is too large, and the insert is easy to shift under the impact force of dissolved materials if the combining force of the insert and the supporting piece is too small, so most of the existing inserts are small inserts such as bolts and binding posts, the contact area of the small inserts and the dissolved materials is small, and further the impact force of the dissolved materials is small, and the insert is not easy to shift.
However, when the insert is placed in a variety of or large area hardware, it is difficult to say that this is primarily dependent on the specific configuration of the final plastic insert product. If the finished plastic insert product contains the large-scale plate insert mainly used for enhancing the strength of the plastic part, and the small-scale inserts which are matched and fixed with the large-scale plate insert and are exposed outside are fewer, namely, the supporting points of the large-scale plate insert are fewer, the large-scale plate insert is suspended and does not reach the supporting points during injection molding, the large-scale plate insert is easy to float, shift and even expose under the impact force of a dissolved material, the final result is that defective products of insert shifting are easy to generate, and the production qualified rate is low. Although the impact force of the melt can be reduced by reducing the amount of the melt fed per unit time, this approach significantly increases the injection molding cycle, thereby increasing the cost, which is not preferable.
Disclosure of Invention
In order to avoid the defects of the background art, the invention provides the injection mold, which can fix the large plate insert when the injection molding part comprises the large plate insert, so that the injection molding part cannot deform, float and the like during injection molding.
The invention provides an injection mold which comprises an upper mold base 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 base plate is provided with a first mold core and a second mold core; the upper die fixing plate is fixedly connected with the upper die base 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 greater than the height of the limiting needle fixing plate; the limiting needle 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 die core are respectively provided with a plurality of first needle holes, second needle holes and third needle holes which are coaxial up and down; the limiting needle comprises a fixed end, a needle body and a tail end, 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 penetrates 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 matching 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 props against the metal piece in the accommodating cavity; when the plastic part is molded 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.
Furthermore, 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.
Furthermore, 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.
Furthermore, the needle fixing device further comprises a limiting needle cover plate, a groove used for placing the limiting needle cover plate is formed in the upper end face of the limiting needle fixing plate, a positioning groove used for placing the limiting needle fixing end is formed in the bottom face of the groove, and the limiting needle cover plate is fixedly connected with the limiting needle fixing plate while covering the limiting needle fixing end to enable the limiting needle fixing end to be fixed in the limiting needle fixing plate.
Furthermore, the bottom surface 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 part with the large plate insert can be injected, and the large plate insert is fixed through the limit pin capable of moving up and down, so that the large plate insert cannot float or shift due to impact force generated when a dissolved material is injected in the injection molding process, the production stability is finally improved, and the production qualified rate of products is improved.
Drawings
FIG. 1 is an exploded perspective view of an injection mold according to an embodiment.
FIG. 2 is a schematic sectional view of an injection mold according to an embodiment.
FIG. 3 is an enlarged partial cross-sectional view of the injection mold according to the embodiment at the injection molding early stage.
FIG. 4 is a schematic diagram of a second enlarged partial cross-section of the injection mold according to the embodiment at the early stage of injection molding.
FIG. 5 is an enlarged partial cross-sectional view of the injection mold according to the embodiment at the late stage of injection molding.
FIG. 6 is a schematic sectional view of the injection mold according to the embodiment, partially enlarged twice in the latter stage of injection molding.
The reference numbers are as follows: 10-upper die bottom plate; 20-a spacing needle fixing plate; 21-positioning holes; 30-an upper die fixing plate; 31-plate groove; 32-a locating post; 40-hydraulic cylinder; 50-membrane kernel; 60-lower membrane kernel; 70-a limit needle; 80-an adjusting block; 90-limit needle cover plate.
Detailed Description
The invention is further described below with reference to the accompanying drawings and specific examples.
In an embodiment, referring to fig. 1 to 6, an injection mold includes an upper mold base plate 10, an upper mold fixing plate 30, an upper mold core 50, a lower mold core 60, a hydraulic cylinder 40, a limit pin fixing plate 20, a limit pin 70, and a limit pin cover plate 90; the upper die fixing plate 30 is fixedly connected with the upper die base 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 which penetrates through two ends and can be used for placing the limiting pin fixing plate 20, and the depth of the plate groove 31 is greater than the height of the limiting pin fixing plate 20; the limiting needle fixing plate 20 is arranged in the plate groove 31, the bottom surface of the plate groove 31 is provided with a plurality of positioning columns 32, the limiting needle fixing plate 20 is provided with a plurality of positioning holes 21 matched with the positioning columns 32, and the limiting needle fixing plate 20 can only move up and down in the plate groove 31 after being arranged; the upper end face of the limit needle fixing plate 20 is provided with a plurality of grooves for placing the limit needle cover plate 90, the bottom surfaces of the grooves are provided with positioning grooves, and first needle holes are formed in the positioning grooves; the upper die fixing plate 30 and the upper membrane core 50 are respectively provided with a second needle hole and a third needle hole which are coaxial with the first needle hole up and down; the limiting needle 70 comprises a fixed end, a needle body and a tail end, the fixed end of the limiting needle 70 is placed in the positioning groove of the limiting needle fixing plate 20, and the needle body of the limiting needle 70 sequentially penetrates through the first needle hole of the limiting needle fixing plate 20, the second needle hole of the upper die fixing plate 30 and the third needle hole of the upper membrane core 50; finally, the tail end of the limiting needle 70 extends into a cavity formed by matching the upper membrane core 50 and the lower membrane core 60; the spacing needle cover plate 90 is fixed in the groove of the spacing needle fixing plate 20 through screws, and simultaneously the spacing needle 70 is covered to fix the spacing needle 70 and the spacing needle fixing plate 20 together; the two ends of the limit needle fixing plate 20 along the length direction extend out of the plate groove 31 and are respectively fixedly connected with a piston rod of the hydraulic cylinder 40; the piston rod of the hydraulic cylinder 40 moves up and down and can drive the limit needle fixing plate 20 and the limit 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 cavity; when the plastic injection molding reaches 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 mold closing, as shown in fig. 3-4, the hydraulic cylinder starts to work, and a piston rod of the hydraulic cylinder moves downwards and simultaneously 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 supports and fixes the metal piece in the cavity, and the metal piece is prevented from shifting or floating due to impact force during injection of a dissolved material in the injection molding process. After injection molding is started, the dissolved material gradually enters the cavity, and when the dissolved material is close to filling the whole cavity, as shown in fig. 5-6, the piston rod of the hydraulic cylinder 40 moves upward and simultaneously drives the limit needle fixing plate 20 and the limit needle 70 to move upward, so that the tail end of the limit needle 70 is just at the upper edge position of the finished plastic part. At this time, under the action of the pack pressure, the dissolved material is quickly filled in the cavity after the limiting needle 70 moves upwards, and finally the whole cavity is filled with the dissolved material, so that a qualified product is obtained. After the stopper pin 70 is moved upward, since the metal member is substantially surrounded by the molten material, the molten material injected subsequently does not substantially generate a large impact force on the metal member, in other words, the metal member is not substantially displaced or floated after the stopper pin 70 is moved upward. The subsequent demolding process is the same as that of the prior art, and is not described in detail here. However, in the demolding process, the stopper pin 70 in this embodiment may be moved downward to assist demolding, and the stopper pin 70 has a small stroke but has a certain demolding effect.
The hydraulic cylinder 40 of the embodiment is preferably an oil cylinder, and a hydraulic cylinder, an air cylinder, an electric cylinder or other driving cylinders with other media can be used instead of the oil cylinder.
In this embodiment, after the injection mold is manufactured and molded, the extreme position of the up-and-down movement of the tail end is fixed, but due to the existence of the common knowledge in the manufacturing field, namely the machining error, the position of the tail end of the position limiting needle 70 in the error is basically impossible to achieve the effect that the lower extreme position just supports against the metal piece in the cavity and the upper extreme position is at the upper edge position of the finished plastic piece, and at this time, the size of the relevant part needs to be repeatedly modified. The upper limit position and the lower limit position of the tail end of the limit pin 70 depend on a plurality of factors, including the length of the limit pin 70, the depth of the plate groove 31 and the height of the limit pin fixing plate 20, and the preset effects can be achieved by adjusting the sizes, but obviously, in the manufacturing field, there is also a common knowledge that the larger the size of the object is, the larger the processing error of the object is, that is, the difficulty in adjusting the sizes is very large, and in order to reduce the adjustment difficulty, the implementation method is as follows: when in design, the length of the limiting needle 70 is lengthened, then a plurality of adjusting grooves are processed on the upper end surface and the lower end surface of the limiting needle fixing plate 20, adjusting blocks 80 are fixed in the adjusting grooves, and the height of each adjusting block 80 is larger than the depth of each adjusting groove; obviously, after the length of the spacing pin 70, the depth of the plate groove 31 and the height of the spacing pin fixing plate 20 are all fixed, the upper limit position of the tail end of the spacing pin 70 can be adjusted by increasing or decreasing the height of the adjusting block 80 on the upper end surface of the spacing pin fixing plate 20; similarly, the lower limit position of the tail end of the spacing pin 70 can be adjusted by increasing or decreasing the height of the adjusting block 80 on the lower end surface of the spacing pin fixing plate 20.
The injection molding piece with the large-scale plate insert can be injected by the injection mold, the large-scale plate insert is fixed through the limiting needle 70 which can move up and down, so that the injection molding process can not float or shift due to the impact force when a dissolved material is injected, the production stability is finally increased, and the production qualified rate of products is improved.
Although the present invention has been described with reference to preferred embodiments, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and various changes in form and details may be made within the scope of the appended claims.
Claims (6)
1. An injection mold, its 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 base 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 greater than the height of the limiting needle fixing plate; the limiting needle 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 die core are respectively provided with a plurality of first needle holes, second needle holes and third needle holes which are coaxial up and down; the limiting needle comprises a fixed end, a needle body and a tail end, 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 penetrates 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 matching 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 props against the metal piece in the accommodating cavity; when the plastic part is molded 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.
2. An injection mold according to claim 1, wherein: 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.
3. An injection mold according to claim 1, wherein: 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.
4. An injection mold according to claim 1, wherein: still include spacing needle apron, the up end of spacing needle fixed plate has and is used for placing the recess of spacing needle apron, the grooved underside has places the constant head tank of spacing needle stiff end, spacing needle apron with spacing needle fixed plate fixed connection is simultaneously spacing needle apron covers spacing needle stiff end makes it fix in the spacing needle fixed plate.
5. An injection mold according to claim 1, wherein: the bottom surface 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.
6. 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 true CN112873710A (en) | 2021-06-01 |
| CN112873710B 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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| Country | Link |
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| CN (1) | CN112873710B (en) |
Cited By (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 |
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| WO2014000886A1 (en) * | 2012-06-28 | 2014-01-03 | Arslandogdu Ismail | Auxiliary injection mould for the injection-moulding of hollow plastics bodies |
| 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 |
| 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 |
| US20190001539A1 (en) * | 2015-08-27 | 2019-01-03 | Illinois Tool Works Inc. | Injection-moulded component, joint, injection-moulding device, and method for producing an injection-moulded component |
| 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 |
-
2021
- 2021-01-12 CN CN202110038303.2A patent/CN112873710B/en active Active
Patent Citations (7)
| 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 |
| 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 |
| US20190001539A1 (en) * | 2015-08-27 | 2019-01-03 | Illinois Tool Works Inc. | Injection-moulded component, joint, injection-moulding device, and method for producing an injection-moulded component |
| 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 |
Cited By (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112873710B (en) | 2023-05-09 |
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