CN113119407B - Injection mold suitable for machining internal thread plastic part - Google Patents
Injection mold suitable for machining internal thread plastic part Download PDFInfo
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- CN113119407B CN113119407B CN202110452930.0A CN202110452930A CN113119407B CN 113119407 B CN113119407 B CN 113119407B CN 202110452930 A CN202110452930 A CN 202110452930A CN 113119407 B CN113119407 B CN 113119407B
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- insert
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2001/00—Articles provided with screw threads
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- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention provides an injection mold suitable for processing an internal thread plastic part, which comprises a female mold and a male mold which are matched with each other, wherein the female mold comprises a female mold insert and a female mold core insert, and the male mold comprises a male mold insert, a thread insert and a connecting rod fixedly connected with the thread insert through an inner hexagon screw; the thread insert is coaxially provided with a through hole, the diameter value of the through hole is between the diameter value of the female die core insert and the diameter value of the circumscribed circle of the hexagon socket counter bore at the end part of the hexagon socket screw, and when the female die and the male die are closed, the female die core insert completely covers the through hole to form a sealing glue position; and the end part of the thread insert far away from one end of the thread is dug with a limit sink groove for accommodating the inner hexagon screw, and the screw wrench penetrates through the through hole to tightly abut against the inner hexagon sink hole at the end part of the inner hexagon screw, so that the thread insert is fixedly connected with the connecting rod. According to the invention, the mounting position of the socket head cap screw is changed by optimizing the thread insert structure, and the problem of glue leakage in the processing of the internal thread plastic part is effectively solved on the basis of meeting the requirements of convenient and fast die filling and die repairing operations.
Description
Technical Field
The invention belongs to the technical field of injection molds, and particularly relates to an injection mold suitable for machining an internal thread plastic part.
Background
As is well known, the internal screw mold 30, which is constructed as shown in fig. 1, is produced by an injection mold comprising the screw insert 22. The existing screw insert 22 has the following assembling mode: as shown in fig. 2, one end of the screw thread insert 22 is inserted into the core insert 21 for assembly, and the other end thereof is directly and fixedly connected with the connecting rod 23 through the socket head cap screw 24; the screw thread insert 22 can be assembled from top to bottom during mold assembling, and only the screw thread insert 22 needs to be disassembled during mold repairing, so that the mold assembling and repairing operations are convenient and quick.
However, in the case that the diameter of the opening of the cavity insert 12 is smaller than Φ 6.5, as shown in fig. 3, if the above-mentioned assembly method of the thread insert 22 is still adopted, the surface of the cavity insert 12 touched through is smaller, and the cavity insert 11 will not have a glue sealing position, which may cause glue leakage during injection molding, because:
1. because the connecting rod 23 is longer after being connected with the thread insert 22, in order to ensure that the thread is not blocked and damages the male mold insert 21 and the thread insert 22 in the process of withdrawing the thread, the thread insert 22 and the connecting rod 23 need to be connected by adopting the hexagon socket head cap screw 24, and the movable gap of about 0.1mm is ensured.
2. Because the diameter phi 6.5 of the screw head of the minimum socket head cap screw 24 and the clearance are added, a clearance groove with the diameter larger than phi 6.5 needs to be processed on the top surface of the screw tooth insert 22, and under the condition that the diameter of the opening part of the female die core insert 12 is smaller than phi 6.5, the male die core insert and the female die core insert cannot form a glue sealing position on a collision penetrating surface, so that the glue leakage phenomenon is generated during injection molding.
Therefore, it is necessary to optimize the screw thread insert structure so as to avoid glue leakage on the basis that the fixing structure of the screw thread insert structure and the connecting rod is convenient and fast in die filling and die repairing operation.
Disclosure of Invention
In order to solve the technical problem, the invention provides the injection mold suitable for processing the internal thread plastic part, the installation position of the internal hexagon screw is changed by optimizing the thread insert structure, and the glue leakage phenomenon in the processing process of the internal thread plastic part is effectively solved on the basis of meeting the requirements of convenient and fast die filling and die repairing operations.
The invention provides the following technical scheme that the injection mold suitable for processing the internal thread plastic part comprises a female mold and a male mold which are matched with each other, wherein the female mold comprises a female mold insert and a female mold insert assembled in the female mold insert, and the end part of the female mold insert protrudes out of the molding concave surface of the female mold insert; the male die comprises a male die insert matched with the female die insert, a thread insert matched with the female die insert and a connecting rod fixedly connected with the thread insert through a hexagon socket head cap screw, and the thread insert is assembled in the male die insert; preferably, the thread insert is coaxially provided with a through hole, the diameter value of the through hole is between the diameter value of the cavity insert and the diameter value of the circumscribed circle of the hexagon socket counter bore at the end of the hexagon socket screw, and when the female die and the male die are closed, the cavity insert completely covers the through hole to form a sealing position; and the end part of the thread insert, which is far away from one end of the thread, is dug to be provided with a limit sink groove for accommodating the hexagon socket head cap screw, the hexagon socket head cap screw is limited to move in the limit sink groove, a screw wrench penetrates through the through hole to abut against the hexagon socket head cap counter bore at the end part of the hexagon socket head cap screw, and the hexagon socket head cap screw is screwed to be in threaded fit with the connecting rod, so that the thread insert is fixedly connected with the connecting rod.
Compared with the prior art, the invention has the beneficial effects that: through optimizing the sub-structure is gone into to the screw tooth, changes hexagon socket head cap screw's mounted position only needs processing on the screw tooth goes into the son the through-hole, the through-hole diameter value is in the sub-diameter value of cavity benevolence income reaches between the hexagon socket outside diameter value of hexagon socket head cap screw tip, need not the processing of screw tooth income son terminal surface holds the groove of dodging of hexagon socket head cap screw tip realizes the screw tooth go into son with on connecting rod fixed connection's the basis, can effectively solve the phenomenon of leaking glue.
Preferably, the limit sinking groove comprises a first square groove and a second square groove which are communicated with each other, the width of the first square groove is smaller than that of the second sinking groove, and the diameter of the socket head cap screw is between the width of the first square groove and that of the second sinking groove. The technical characteristic design aims to form a step structure, so that the inner hexagonal screw can move in the second sunken groove in a limiting manner.
Preferably, a thread connecting piece is arranged in the second square groove, the width of the thread connecting piece is between the width of the second square groove and the width of the first square groove, and the hexagon socket screw penetrates through the thread connecting piece and is in threaded connection with the connecting rod. The structural characteristic design aims at strengthening the connection strength of the screw tooth insert and the connecting rod.
Preferably, the second square groove is communicated with the outer circular surface of the screw tooth insert. The technical feature is that the screw connection piece is easy to install.
Preferably, a limiting part is convexly arranged at the end part of the connecting rod, and the limiting part is inserted into the first square groove to limit the rotation of the connecting rod. The structural characteristic design aims to quickly realize the connection of the screw tooth insert and the connecting rod.
Preferably, the height value of the limiting part is greater than the depth value of the first square groove. The aim of the technical characteristic design is to realize the butt joint of the limiting part and the thread connecting piece, and improve the anti-shearing capacity of the socket head cap screw.
Preferably, the first square groove is communicated with the outer circular surface of the screw tooth insert. The technical characteristic design aims to facilitate the insertion of the limiting part into the first square groove.
Preferably, the end part of the connecting rod far away from one end of the limiting part is provided with a straight sunk groove in an excavating mode. The technical characteristic design aims to prevent the connecting rod from rotating in the process of connecting the socket head cap screw and the connecting rod through threads.
Preferably, the screw thread insert and the male die insert are assembled in a transition fit mode.
Preferably, the cavity insert and the cavity insert are assembled in an interference fit manner.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a cross-sectional view of an injection molded internal thread molding of the present invention;
FIG. 2 is a cross-sectional view of a prior art male mold assembly of an injection mold;
FIG. 3 is a cross-sectional view of a prior art injection mold during closed mold forming;
FIG. 4 is an assembly view of an injection mold suitable for machining an internal thread molding according to the present invention;
FIG. 5 is a schematic view of a portion of the label A of FIG. 4;
FIG. 6 is a schematic enlarged partial view of the mark B in FIG. 4;
FIG. 7 is an assembly view of the screw insert and the screw connecting piece for engaging with the socket head cap screw according to the present invention;
FIG. 8 is an exploded view of the screw insert of the present invention and the screw connecting piece for engaging with the socket head cap screw;
FIG. 9 is an enlarged partial view of section C of FIG. 4;
description of reference numerals:
10-a female die, 11-a female die insert and 12-a female die core insert;
20-male die, 21-male die insert, 22-screw thread insert, 221-through hole, 222-limit sink groove, 2221-first square groove, 2222-second square groove, 23-connecting rod, 231-limit part, 24-inner hexagon screw and 25-screw thread connecting piece;
30-internal thread plastic piece.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the embodiments of the present invention, and should not be construed as limiting the invention.
In the description of the embodiments of the present invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings only for the convenience of describing the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention may be understood by those of ordinary skill in the art according to specific situations.
In one embodiment of the present invention, as shown in fig. 4, an injection mold for machining an internal screw molding includes a female mold half 10 and a male mold half 20 that are matched with each other. In this embodiment, the female mold 10 includes a female mold insert 11 and a female mold insert 12 assembled in the female mold insert 11, and an end of the female mold insert 12 protrudes out of a molding concave surface of the female mold insert 11. In specific practice, during the injection molding process of the injection mold, the female mold 10 is in a static state, and due to the formation of a hole site above the internal thread molding element 30, the end of the female mold core insert 12 needs to protrude out of the molding concave surface of the female mold insert 11; in order to prevent the glue solution in the injection mold from leaking from the assembly gap between the cavity insert 12 and the cavity insert 11, preferably, the cavity insert 12 and the cavity insert 11 are assembled in an interference fit manner.
Further, the male mold 20 comprises a male mold insert 21 matched with the female mold insert 11, a thread insert 22 matched with the female mold insert 12, and a connecting rod 23 fixedly connected with the thread insert 22 through a socket head cap screw 24, wherein the thread insert 22 is assembled in the male mold insert 21. In a specific practice, since the molded internal thread plastic part 30 is sleeved at the thread end of the thread insert 22, in order to facilitate the taking out of the internal thread plastic part 30, the protrusion of the thread insert 22 relative to the male mold insert 21 is realized under the ejection of the connecting rod 23; therefore, the screw thread insert 22 needs to move relative to the male mold insert 21, and glue in the injection mold is prevented from leaking from a gap between the screw thread insert 22 and the male mold insert 21; preferably, the thread insert 22 and the male die insert 21 are assembled in a transition fit manner.
Further, the principle of injection molding of the internal thread plastic part 30 is as follows: when the female die 10 and the male die 20 are in a closed state, the female die insert 11 and the male die insert 21 are closed to form a closed cavity, the end surface of the female die insert 12 abuts against the end of the screw thread insert 22 to form a hole site of the internal screw thread plastic part 30, the end of the screw thread insert 22 can form an internal screw thread of the internal screw thread plastic part 30, and glue is injected into the closed cavity on the parting surface to realize injection molding of the internal screw thread plastic part 30.
As shown in fig. 4 and 5, the screw insert 22 is coaxially provided with a through hole 221, a diameter value of the through hole 221 is between a diameter value of the cavity insert 12 and a diameter value of a circumscribed circle of the hexagon socket head cap screw 24, and when the female mold 10 and the male mold 20 are closed, the cavity insert 12 completely covers the through hole 221 to form a sealing position. In this embodiment, the through hole 221 is provided for allowing a screw wrench to pass through the screw thread insert 22, and the socket head cap screw 24 is screwed to connect the screw thread insert 22 and the connecting rod 23; specifically, compared with the existing injection mold shown in fig. 3, only the through hole 221 capable of passing through a screw wrench needs to be processed on the screw insert 22, and a clearance groove for accommodating the socket head cap screw 24 does not need to be processed at the end of the screw insert 22, so that the cavity insert 12 can completely cover the through hole 221 to form a sealing position, thereby avoiding the occurrence of a glue leakage phenomenon and ensuring the molding quality of the internal screw plastic part 30.
As shown in fig. 4 and fig. 6, a limiting sunk groove 222 for accommodating the socket head cap screw 24 is dug in the end portion of the screw thread insert 22 far away from one end of the screw thread, and the socket head cap screw 24 moves in the limiting sunk groove 222 in a limiting manner. In this embodiment, the mounting position of the socket head cap screw 24 is changed by optimizing the structure of the thread insert 22. Specifically, a screw wrench penetrates through the through hole 221 and abuts against the inner hexagonal counter bore at the end of the inner hexagonal screw 24, and the inner hexagonal screw 24 is screwed to be in threaded fit with the connecting rod 23, so that the screw thread insert 22 is fixedly connected with the connecting rod 23; compared with the existing injection mold in fig. 3, a screw wrench penetrates through the through hole 221 and is arranged in the thread insert 22, the hexagon socket counter bore at the end of the hexagon socket screw 24 is tightly abutted, the thread insert 22 and the connecting rod 23 can be fixedly connected by rotating the screw wrench, and the technical effects that the thread insert 22 can be assembled from top to bottom when the existing injection mold in fig. 3 is assembled and the thread insert 22 only needs to be disassembled when the mold is repaired are achieved.
Therefore, compared with the prior art, the installation position of the socket cap screw 24 is changed by optimizing the structure of the thread insert 22, only the through hole 221 needs to be processed on the thread insert 22, an avoiding groove for accommodating the end part of the socket cap screw 24 does not need to be processed on the end face of the thread insert 22, and the phenomenon of glue leakage can be effectively solved on the basis of fixedly connecting the thread insert 22 and the connecting rod 23.
As shown in fig. 7 and 8, the limiting sinking groove 222 includes a first square groove 2221 and a second square groove 2222 that are communicated with each other, the width of the first square groove 2221 is smaller than the width of the second sinking groove 2222, and the diameter of the socket head cap screw 24 is between the width of the first square groove 2221 and the width of the second square groove 2222. In this embodiment, the first square groove 2221 and the second square groove 2222 are arranged to form a step structure, so that the socket head cap screw 24 can move in the second square groove 2222 in a limited manner. Further, in order to strengthen the connecting strength between the screw thread insert 22 and the connecting rod 23; specifically, a thread connecting piece 25 is disposed in the second square groove 2222, and the width of the thread connecting piece 25 is between the width of the second square groove 2222 and the width of the first square groove 2221. Preferably, for the convenient installation of the thread connecting piece 25 in the second square groove 2222, the second square groove 2222 is communicated with the outer circumferential surface of the thread insert 22.
As shown in fig. 9, a limiting portion 231 is convexly disposed at an end portion of the connecting rod 23, and a straight sinking groove is dug at an end portion of the connecting rod 23 away from one end of the limiting portion 231. In this embodiment, the limiting portion 231 is inserted into the first square groove 2221, and a tool can limit the rotation of the connecting rod 23 through the straight-line sunken groove on the connecting rod 23, so that when the socket head cap screw 24 is screwed, the limiting portion 231 is embedded into the screw insert 22 through the first square groove 2221, so that the screw insert 22 does not rotate, and the connection between the screw insert 22 and the connecting rod 23 is rapidly achieved. Preferably, in order to facilitate the insertion of the stopper 231 into the first square groove 2221, the first square groove 2221 is communicated with an outer circumferential surface of the screw insert 22.
Further, the height of the limiting portion 231 is greater than the depth of the first square groove 2221, so that the limiting portion 231 abuts against the thread connecting piece 25, the shearing resistance of the socket head cap screw 24 is improved, and the connection firmness of the thread insert 22 and the connecting rod 23 is ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An injection mold suitable for machining an internal thread plastic part comprises a female mold and a male mold which are matched with each other, wherein the female mold comprises a female mold insert and a female mold core insert assembled in the female mold insert, and the end part of the female mold core insert protrudes out of a molding concave surface of the female mold insert; the male die comprises a male die insert matched with the female die insert, a thread insert matched with the female die insert and a connecting rod fixedly connected with the thread insert through a hexagon socket head cap screw, and the thread insert is assembled in the male die insert; the method is characterized in that: the female die insert is provided with a through hole in a coaxial line, the diameter value of the through hole is between the diameter value of the female die insert and the diameter value of the circumcircle of the hexagon socket countersink at the end part of the hexagon socket screw, when the female die and the male die are closed, the internal thread of the internal thread molding piece can be molded at the thread end of the female die insert, the hole position of the internal thread molding piece can be molded by abutting the end surface of the female die insert and the thread end part of the thread insert, and the female die insert completely covers the through hole to form a sealing position; and the end part of the thread insert, which is far away from one end of the thread, is dug to be provided with a limit sink groove for accommodating the hexagon socket head cap screw, the hexagon socket head cap screw is limited to move in the limit sink groove, a screw wrench penetrates through the through hole to abut against the hexagon socket head cap counter bore at the end part of the hexagon socket head cap screw, and the hexagon socket head cap screw is screwed to be in threaded fit with the connecting rod, so that the thread insert is fixedly connected with the connecting rod.
2. The injection mold suitable for processing the internal thread plastic part as claimed in claim 1, wherein the limit sinking groove comprises a first square groove and a second square groove which are communicated with each other, the width of the first square groove is smaller than that of the second square groove, and the diameter of the socket head cap screw is between the width of the first square groove and that of the second square groove.
3. The injection mold suitable for machining the internal thread plastic part according to claim 2, wherein a thread connecting piece is arranged in the second square groove, the width of the thread connecting piece is between the width of the second square groove and the width of the first square groove, and the internal hexagonal screw penetrates through the thread connecting piece and is in threaded connection with the connecting rod.
4. An injection mold suitable for machining of an internal thread plastic part according to claim 3, wherein the second square groove is communicated with an outer circular surface of the thread insert.
5. The injection mold suitable for processing the internal thread plastic part as claimed in claim 2, wherein a limiting part is convexly arranged at the end part of the connecting rod, and the limiting part is inserted into the first square groove to limit the rotation of the connecting rod.
6. An injection mold suitable for machining of an internal thread plastic part according to claim 5, wherein the height value of the limiting part is larger than the depth value of the first square groove.
7. The injection mold suitable for machining the internal thread plastic part according to claim 5, wherein the first square groove is communicated with an outer circular surface of the thread insert.
8. An injection mold suitable for machining of internal thread plastic parts according to claim 5, wherein a straight-line sunk groove is dug in the end portion of the connecting rod far away from one end of the limiting portion.
9. The injection mold suitable for machining the internal thread plastic part according to any one of claims 1 to 8, wherein the thread insert and the male mold insert are assembled in a transition fit manner.
10. The injection mold suitable for machining an internal thread plastic part according to any one of claims 1 to 8, wherein the female mold core insert and the female mold insert are assembled in an interference fit manner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110452930.0A CN113119407B (en) | 2021-04-26 | 2021-04-26 | Injection mold suitable for machining internal thread plastic part |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110452930.0A CN113119407B (en) | 2021-04-26 | 2021-04-26 | Injection mold suitable for machining internal thread plastic part |
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| CN113119407A CN113119407A (en) | 2021-07-16 |
| CN113119407B true CN113119407B (en) | 2022-12-16 |
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| CN114872279B (en) * | 2022-04-27 | 2023-10-27 | 欧唐科技（深圳）有限公司 | Inner tooth and outer tooth demoulding device for plastic mould product |
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| CN101811340A (en) * | 2009-02-25 | 2010-08-25 | 鸿富锦精密工业（深圳）有限公司 | mould |
| CN205363747U (en) * | 2016-03-09 | 2016-07-06 | 重庆市璧山区密友精工有限公司 | Go into submodule core and dismantle frock fast |
| CN206134518U (en) * | 2016-10-20 | 2017-04-26 | 浙江正泰电器股份有限公司 | Connect line knot structure and use this circuit breaker that connects line knot to construct |
| CN208133532U (en) * | 2018-03-30 | 2018-11-23 | 铭成精密工业（大连）有限公司 | Injection Mould With Automatic Thread Demoulding tool |
| CN209794312U (en) * | 2019-03-27 | 2019-12-17 | 江西联益光学有限公司 | Die set |
| CN210651717U (en) * | 2019-09-11 | 2020-06-02 | 厦门技师学院(厦门市高级技工学校、厦门市高技能人才公共实训服务中心、厦门市劳动保护宣传教育中心) | Sectional type screw thread pitched roof lateral parting core-pulling mechanism |
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