CN115071072A - Injection mold with curved track mechanism of loosing core - Google Patents

Injection mold with curved track mechanism of loosing core Download PDF

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Publication number
CN115071072A
CN115071072A CN202210955125.4A CN202210955125A CN115071072A CN 115071072 A CN115071072 A CN 115071072A CN 202210955125 A CN202210955125 A CN 202210955125A CN 115071072 A CN115071072 A CN 115071072A
Authority
CN
China
Prior art keywords
ejector
core
movable
ejector pin
track
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.)
Pending
Application number
CN202210955125.4A
Other languages
Chinese (zh)
Inventor
黄腊娥
储为才
储善斌
徐永剑
蒋建平
陈曜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Jianlin Mould Co ltd
Original Assignee
Ningbo Jianlin Mould Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ningbo Jianlin Mould Co ltd filed Critical Ningbo Jianlin Mould Co ltd
Priority to CN202210955125.4A priority Critical patent/CN115071072A/en
Publication of CN115071072A publication Critical patent/CN115071072A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/33Moulds having transversely, e.g. radially, movable mould parts
    • B29C45/332Mountings or guides therefor; Drives therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/40Removing or ejecting moulded articles
    • B29C45/44Removing or ejecting moulded articles for undercut articles
    • B29C45/4435Removing or ejecting moulded articles for undercut articles using inclined, tiltable or flexible undercut forming elements driven by the ejector means

Abstract

The invention relates to an injection mold with a curved track core pulling mechanism, which comprises a fixed mold cavity, a movable mold core, a large straight top, a large inclined top, a track changing pulling block, a movable mold plate, an ejector pin bottom plate and an ejector pin plate, wherein the large inclined top is matched with the movable mold core through an inclined guide mechanism; the ejector pin plate is used for secondary ejection, the plastic part is completely separated from the large straight top and the movable die core, the forced demoulding structure and the secondary ejection mechanism are firstly used for realizing the separation of the plastic part, and the ejector pin plate has a simple structure and good action stability. Belongs to the technical field of dies.

Description

Injection mold with curved track mechanism of loosing core
Technical Field
The invention belongs to the technical field of molds, and particularly relates to an injection mold with a curved track core pulling mechanism.
Background
The plastic injection mold is one common plastic forming mold, and the plastic injection mold has the corresponding processing apparatus of plastic injection molding machine, which includes heating material cylinder in the bottom of the injection machine for melting plastic, screw or plunger of the injection machine for driving the plastic to enter the mold cavity via the nozzle and the mold casting system, cooling, hardening and forming plastic, and demolding. The structure of the device is generally composed of a forming component, a pouring system, a guide component, a pushing mechanism, a temperature adjusting system, an exhaust system, a supporting component and the like. The manufacturing material usually adopts plastic mould steel module, and the commonly used material mainly comprises carbon structural steel, carbon tool steel, alloy tool steel, high-speed steel and the like. The injection molding processing mode is usually only suitable for the production of products of hot plastic products, the plastic products produced by the injection molding process are very wide, and the plastic products from daily necessities to various complex machinery, electric appliances, vehicle parts and the like are molded by injection molds, which is a processing method with the widest application in the production of the plastic products.
As shown in figure 1, two inversed buckles are needed to be overcome during demoulding of a plastic part, the first inversed buckle is the inverse buckle at the position where the plastic part is separated from a cavity of a fixed die, the second inversed buckle is the inverse buckle at the position where the plastic part is separated from an inclined top (sliding block), the two inversed buckles are separated, the structures designed by different die companies are completely different, and the existing defects are that the structure is too complicated or the running stability of the die is insufficient, so that the design of the die with reasonable structure and stable running is required at present.
Disclosure of Invention
The invention aims to: the injection mold with the curved track core pulling mechanism is provided, the forced demoulding between a plastic part and a fixed mold cavity is realized through the curved track, and the demoulding is realized through the secondary ejection mechanism.
The technical scheme adopted by the invention is as follows: an injection mold with a curved track core pulling mechanism comprises a fixed mold cavity and a movable mold, wherein the fixed mold cavity is provided with a fixed mold cavity, the movable mold comprises a movable mold core, a large straight top, a large inclined top, a track changing pulling block, a movable mold plate, an ejector pin base plate and an ejector pin plate, the fixed mold cavity, the movable mold core, the large straight top, the large inclined top and the track changing pulling block are combined to form a forming area for forming a plastic part, the large straight top and the large inclined top are combined to form an arc-shaped outline of the inner wall of the plastic part, the track changing pulling block is provided with an upright post core of a vertical through hole for forming the plastic part, the large straight top is arranged above the side of the movable mold core, the large inclined top is arranged below the large straight top and is abutted against the lower surface of the large straight top, the lower end of the large inclined top is in sliding fit with the ejector pin base plate, the large inclined top is matched with the movable mold core through hole through a inclined guide mechanism, the track changing pulling block is movably matched with the through hole, and the inner end of the track pulling block is connected with a guide rod, the guide rod slides along the through hole, a guide groove is formed in the side face of the inner end of the guide rod, a vertically-arranged curve rail is in sliding fit with the guide groove, the curve rail is installed on the movable die core and is located on the inner side of the large inclined top, the guide rod and the curve rail are arranged in a crossed mode, two ends of the curve rail are arranged in a straight line mode, the middle portion of the curve rail is arranged in a protruding mode, and the guide groove of the guide rod moves transversely along the curve track of the curve rail;
the ejector pin comprises a movable die core, an ejector pin plate, a large oil cylinder, a nitrogen spring, a small oil cylinder, a primary ejector rod, a secondary ejector rod and a secondary ejector rod, wherein the large oil cylinder and the nitrogen spring are arranged between the movable die plate and the ejector pin base plate, the small oil cylinder is arranged between the ejector pin base plate and the ejector pin plate, the primary ejector rod is vertically arranged on the ejector pin base plate, the upper end of the primary ejector rod penetrates through the movable die core from bottom to top and then is connected with the large straight ejector bottom, the secondary ejector rod is vertically arranged on the ejector pin plate, and the upper end of the secondary ejector rod penetrates through the movable die core from bottom to top and then extends to a forming area.
Preferably, the large pitched roof is matched with the movable die core through the pitched guide mechanism, namely, the dovetail groove is arranged on the large pitched roof, and the dovetail groove matched with the dovetail groove is arranged on the movable die core. The structure belongs to a common structure in the mold industry, is relatively mature in processing and low in cost.
The invention has the technical effects that: the invention is used as an injection mold with a curved track core pulling mechanism, and realizes the forced release between a plastic part and a fixed mold cavity through the ingenious design of a guide rod on a curved track and a track changing pulling block, after the forced release and the reset of the plastic part are finished, the ejector pin bottom plate is used for the first ejection, the back-off separation between a large inclined top and the plastic part is realized, and the ejector pin plate is used for the second ejection, so that the complete separation of the plastic part, the large straight top and a movable mold core is realized.
Drawings
Fig. 1 is a schematic cross-sectional view of a plastic part.
Fig. 2 is a partial sectional view showing a clamped state of the present invention.
FIG. 3 is a schematic view of the plastic part separated from the stationary mold cavity.
Fig. 4 is an enlarged view of a in fig. 3.
FIG. 5 is a schematic view after the stationary mold is completely detached.
Fig. 6 is a schematic view of the large lifter after being separated from the plastic part.
Fig. 7 is a schematic representation after full demolding.
Fig. 8 is a schematic diagram of a track change block and a curved track.
In the figure: a fixed die cavity 1; a movable mould core 2; a large straight top 3; a large pitched roof 4; a track changing drawing block 5; a column core 5.1, a guide rod 5.2; a guide groove 5.2.1; a movable template 6; a thimble base plate 7; an ejector plate 8; a plastic part 9; a curved track 10; a large oil cylinder 11; a nitrogen spring 12; a small oil cylinder 13, a primary ejection rod 14; the secondary ejection rod 15.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
Fig. 1 to 8 show that the injection mold with the curved track core-pulling mechanism of the present invention includes a fixed mold and a movable mold, and further includes conventional mold mechanisms such as a cooling system, which are not illustrated in this embodiment, and the technology is obvious to those skilled in the art, and will not be described herein again. The directions of the upper part, the lower part, the left part, the right part and the like mentioned in the embodiment are all described according to the position shown in fig. 2, the fixed die is provided with a fixed die cavity 1, and the fixed die cavity 1 is shaped for molding the outer contour of the plastic part 9. As shown in figure 1, the left lower corner of the plastic part 9 is separated from the fixed mold cavity 1, and the left lower corner of the large inclined top 4 is separated from the plastic part 9; in order to smoothly separate the two back-off parts, the movable mould comprises a movable mould core 2, a large straight top 3, a large inclined top 4, a track-changing drawing block 5, a movable mould plate 6, an ejector pin base plate 7 and an ejector pin plate 8, wherein the fixed mould cavity 1, the movable mould core 2, the large straight top 3, the large inclined top 4 and the track-changing drawing block 5 are combined to form a forming area for forming a plastic part 9, the large straight top 3 and the large inclined top 4 are combined to form an arc-shaped outline of the inner wall of the plastic part 9, the track-changing drawing block 5 is provided with a vertical column core 5.1 of a vertical through hole of the plastic part 9, the large straight top 3 is arranged above the side of the movable mould core 2, the large inclined top 4 is arranged below the large straight top 3 and is abutted against the lower surface of the large straight top 3, the lower end of the large inclined top 4 is in sliding fit on the ejector pin base plate 7, and the large inclined top 4 is matched with the movable mould core 2 through an inclined guide mechanism; because the molded plastic part 9 is involved in a plurality of inversed buckles, the plastic part 9 needs to be forced to be pulled forcibly to separate the plastic part 9 from the fixed mold cavity 1, and because the plastic part 9 has certain elasticity and the inversed buckle angle between the plastic part 9 and the fixed mold cavity 1 is very small, the forced pulling does not have too great influence on the plastic part 9; in order to successfully and forcibly pull the plastic part 9, the existing track transfer core pulling 5 is utilized for forcibly pulling, so that the inner end of the track transfer pulling block 5 is connected with a guide rod 5.2, and in order to ensure the smooth horizontal movement of the guide rod 5.2, the large inclined top 4 is horizontally provided with a through hole, the track transfer pulling block 5 is movably matched in the through hole, and the guide rod 5.2 slides along the through hole; in order to enable the guide rod 5.2 to slide, a power source needs to be arranged, so that a guide groove 5.2.1 is formed in the side face of the inner end of the guide rod 5.2, a vertically-arranged curved rail 10 is in sliding fit in the guide groove 5.2.1, and the guide rod 5.2 and the rail-changing core-pulling 5 move horizontally through the relative movement between the guide groove 5.2.1 and the curved rail 10, so that the guide rod 5.2 and the curved rail 10 are arranged in a crossed manner, two ends of the curved rail 10 are arranged in a straight line, and the middle part of the curved rail 10 is arranged in a protruding manner; when the guide rod 5.2 and the curved rail 10 generate relative motion, the guide groove 5.2.1 of the guide rod 5.2 realizes transverse motion along the track of the curved rail 10, and the middle part of the curved rail 10 is convexly arranged to drive the guide rod 5.2 to generate transverse motion; in addition, two ends of the curve rail 10 are arranged linearly, so that the plastic part 9 is convenient to reset to a non-deformation state after the rail-changing core-pulling 5 drives the plastic part 9 to complete forced demoulding. The invention installs the curve track 10 on the movable mould core 2, the curve track 10 is located at the inner side of the large inclined top 4.
In the embodiment, in order to successfully finish the forced demoulding of the plastic part 9, the rail-changing drawing block 5 transversely moves to drive the plastic part 9 to be forcibly separated from the fixed mold cavity 1, so that the guide rod 5.2 and the curved rail 10 need to move relatively, the curved rail 10 is vertically fixed on the movable mold core 2, a large oil cylinder 11 and a nitrogen spring 12 are arranged between the movable mold plate 6 and the ejector pin bottom plate 7, a large inclined ejector 4 is arranged on the ejector pin bottom plate 7, a primary ejector rod 14 is vertically arranged on the ejector pin bottom plate 7, the upper end of the primary ejector rod 14 penetrates through the movable mold core 2 from bottom to top and then is connected with the bottom of the large straight ejector 3, the fixed mold cavity 1 moves upwards when the mold is opened, the large oil cylinder 11 drives the ejector pin bottom plate 7 and the primary ejector rod 14 to move upwards, and at the time, the large straight ejector 3, the large inclined ejector 4, the plastic part 9, the rail-changing drawing block 5 and the guide rod 5.2 uniformly move upwards and are fixed by the curved rail 10, therefore, the guide rod 5.2 and the curved rail 10 move relatively, the guide rod 5.2 moves along the track of the curved rail 10 under the action of the guide groove 5.2.1, and the guide rod 5.2 moves transversely due to the protruding arrangement of the middle part of the curved rail 10, so that the rail-changing drawing block 5 drives the plastic part 9 to move through the upright post core 5.1, and is forcedly separated from the fixed die cavity 1 to finish forced separation.
The design of the structure of the invention realizes the forced detachment and also realizes the detachment of the large lifter 4 from the back-off at the lower left corner of the plastic part 9, because the large lifter 4 between the large lifter 4 and the movable die core 2 is matched with the movable die core 2 through the inclined guide mechanism; the matching between the large inclined top 4 and the movable mould core 2 through the inclined guide mechanism means that a dovetail groove is arranged on the large inclined top 4, and a dovetail matched with the dovetail groove is arranged on the movable mould core 2. The large inclined top 4 moves upwards and also moves transversely along the thimble base plate 7 towards the right side at the same time, and is separated from the plastic part 9.
After the plastic part 9 is forcibly detached from the fixed mold cavity 1 and the large inclined fixed mold 4 is separated from the plastic part 9, the plastic part 9 is completely ejected in the last step, so that a small oil cylinder 13 is arranged between the ejector base plate 7 and the ejector plate 8, a secondary ejection rod 15 is vertically arranged on the ejector plate 8, and the upper end of the secondary ejection rod 15 penetrates through the movable mold core 2 from bottom to top and then extends to a molding area. The small oil cylinder 13 drives the ejector plate 8 and the secondary ejector rod 15 to move, and the plastic part 9 is completely separated from the movable die core 2.
The working principle of the invention is as follows: and (3) mounting the fixed die and the movable die on an injection molding machine, injecting the material into the region by the injection molding machine in a die closing state as shown in figure 2, and demolding after cooling. Firstly, the whole fixed die and the fixed die cavity 1 move upwards, simultaneously, the large oil cylinder 11 and the nitrogen spring 12 drive the thimble bottom plate 7 and the primary ejector rod 14 to move upwards together, the primary ejector rod 14 is connected with the large straight top 3, at the moment, the large straight top 3, the large inclined top 4, the plastic part 9, the track-changing core-pulling 5 and the guide rod 5.2 are uniform and move upwards along with the upward movement and are fixed by the curved track 10, therefore, the guide rod 5.2 and the curved track 10 generate relative motion, the guide rod 5.2 moves along the track of the curved track 10 under the action of the guide groove 5.2.1, because the middle part of the curved rail 10 is convexly arranged, when the guide groove 5.2.1 is convexly contacted with the middle part of the curved rail 10, therefore, the guide rod 5.2 and the track-changing drawing block 5 move transversely, the track-changing drawing block 5 drives the plastic part 9 to move through the upright post core 5.1 and is forcedly separated from the fixed die cavity 1 to complete forced releasing (first reverse buckling), and the state after forced releasing is as shown in fig. 3; after the forced disengagement, the fixed die is accelerated to move, as shown in fig. 5. The large pitched roof 4 and the guide rod 5.2 continue to move upwards, and because the upper end and the lower end of the curved track 10 are straight lines, when the guide groove 5.2.1 is contacted with the lower end of the curved track 10, the influence of the middle bulge of the curved track 10 is avoided, which means that the guide rod 5.2 is reset to the initial position, namely the plastic part 9 is reset to the pre-stripping state, as shown in fig. 6.
The large inclined ejector 4 between the large inclined ejector 4 and the movable die core 2 is matched with the movable die core 2 through an inclined guide mechanism; under the combined action of the ejector pin base plate 7 and the primary ejector rod 14, the large lifter 4 moves upwards and also moves transversely along the ejector pin base plate 7 to the right side, and is gradually separated from the plastic part 9 until the large lifter 4 is separated from the plastic part 9 in a reversed manner at the lower left corner, as shown in fig. 6. After the large inclined fixture 4 is separated from the plastic part 9, the small oil cylinder 13 drives the ejector plate 8 and the secondary ejector rod 15 to move, so that the plastic part 9 is completely separated from the movable die core 2, and the demoulding is completed, as shown in fig. 7.
The foregoing has described the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed.

Claims (2)

1. The utility model provides an injection mold with mechanism of loosing core of curve track, includes cover half and movable mould, the cover half is provided with cover half die cavity (1), its characterized in that: the movable mould comprises a movable mould core (2), a large straight ejector (3), a large inclined ejector (4), a track-changing drawing block (5), a movable mould plate (6), an ejector pin base plate (7) and an ejector pin plate (8), wherein the fixed mould cavity (1), the movable mould core (2), the large straight ejector (3), the large inclined ejector (4) and the track-changing drawing block (5) are combined to form a forming area for forming a plastic part (9), the large straight ejector (3) and the large inclined ejector (4) are combined to form an arc-shaped profile of the inner wall of the plastic part (9), a column core (5.1) for forming a vertical through hole of the plastic part (9) is arranged on the track-changing drawing block (5), the large straight ejector (3) is arranged above the side of the movable mould core (2), the large inclined ejector (4) is positioned below the large straight ejector (3) and is abutted against the lower surface of the large straight ejector (3), the lower end of the large inclined ejector (4) is in sliding fit on the ejector pin base plate (7), and the large inclined ejector (4) is matched with the movable mould core (2) through an inclined guide mechanism, the large inclined top (4) is horizontally provided with a through hole, the rail-changing drawing block (5) is movably matched in the through hole, the inner end of the rail-changing drawing block (5) is connected with a guide rod (5.2), the guide rod (5.2) slides along the through hole, the side surface of the inner end of the guide rod (5.2) is provided with a guide groove (5.2.1), a vertically-arranged curve rail (10) is slidably matched in the guide groove (5.2.1), the curve rail (10) is installed on the movable die core (2), the curve rail (10) is positioned on the inner side of the large inclined top (4), the guide rod (5.2) and the curve rail (10) are arranged in a crossed manner, two ends of the curve rail (10) are arranged in a straight line, the middle part of the curve rail (10) is arranged in a protruding manner, and the guide groove (5.2.1) of the guide rod (5.2) realizes transverse movement along the curve rail (10) of the curve rail (10);
a large oil cylinder (11) and a nitrogen spring (12) are arranged between the movable template (6) and the ejector pin base plate (7), a small oil cylinder (13) is arranged between the ejector pin base plate (7) and the ejector pin plate (8), a primary ejector rod (14) is vertically arranged on the ejector pin base plate (7), the upper end of the primary ejector rod (14) penetrates through the movable mold core (2) from bottom to top and then is connected with the bottom of the large straight ejector (3), a secondary ejector rod (15) is vertically arranged on the ejector pin plate (8), and the upper end of the secondary ejector rod (15) penetrates through the movable mold core (2) from bottom to top and then extends to a forming area.
2. An injection mold having a curved track core pulling mechanism as claimed in claim 1, wherein: the large pitched roof (4) is matched with the movable mould core (2) through the pitched guide mechanism, namely, a dovetail groove is arranged on the large pitched roof (4), and a dovetail matched with the dovetail groove is arranged on the movable mould core (2).
CN202210955125.4A 2022-08-10 2022-08-10 Injection mold with curved track mechanism of loosing core Pending CN115071072A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210955125.4A CN115071072A (en) 2022-08-10 2022-08-10 Injection mold with curved track mechanism of loosing core

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210955125.4A CN115071072A (en) 2022-08-10 2022-08-10 Injection mold with curved track mechanism of loosing core

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Publication Number Publication Date
CN115071072A true CN115071072A (en) 2022-09-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116901373A (en) * 2023-09-08 2023-10-20 常州华威模具有限公司 Automobile auxiliary instrument board preparation device and preparation method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203460404U (en) * 2013-06-27 2014-03-05 长城汽车股份有限公司 Inner parting mould protection mechanism of car bumper
CN110181761A (en) * 2019-05-14 2019-08-30 浙江零跑科技有限公司 The mould structure that can prevent bumper from being pulled in manufacturing process demoulding

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203460404U (en) * 2013-06-27 2014-03-05 长城汽车股份有限公司 Inner parting mould protection mechanism of car bumper
CN110181761A (en) * 2019-05-14 2019-08-30 浙江零跑科技有限公司 The mould structure that can prevent bumper from being pulled in manufacturing process demoulding

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116901373A (en) * 2023-09-08 2023-10-20 常州华威模具有限公司 Automobile auxiliary instrument board preparation device and preparation method thereof
CN116901373B (en) * 2023-09-08 2023-11-17 常州华威模具有限公司 Automobile auxiliary instrument board preparation device and preparation method thereof

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Application publication date: 20220920