CN113059757A

CN113059757A - Internal thread cover forming die

Info

Publication number: CN113059757A
Application number: CN202110301164.8A
Authority: CN
Inventors: 肖国华
Original assignee: Zhejiang Business Technology Institute
Current assignee: Shenzhen Jiayushun Technology Co ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-07-02
Anticipated expiration: 2041-03-22
Also published as: CN113059757B

Abstract

The invention discloses an internal thread cover forming die, which relates to the technical field of internal thread cover forming and comprises a die body, wherein the die body comprises a fixed die mechanism and a movable die mechanism, a forming die cavity is arranged between the fixed die mechanism and the movable die mechanism, a formed part is arranged in the forming die cavity, and the formed part is used for forming an internal thread cover plastic part; the forming part comprises a cavity insert, an outer ring core, an inner core and a thread core, wherein the cavity insert and the outer ring core are used for forming the outer wall of the internal thread plastic-covered part, the inner core is used for forming the inner wall of the top of the internal thread plastic-covered part, and the thread core is used for forming the internal thread and the inner wall cylindrical surface of the internal thread plastic-covered part; and the movable die mechanism is also provided with a driving device. The invention has simple and practical structure and reliable mechanism action, and realizes the molding of the internal thread cover plastic part.

Description

Internal thread cover forming die

Technical Field

The invention relates to the technical field of internal thread cover forming, in particular to an internal thread cover forming die.

Background

A pagoda-shaped internal thread cover is provided, as shown in figure 1, the top surface of a plastic part is provided with 1 oval groove and 1 oval groove

Straight holes. The top end of the inner wall is provided with 2 fan-shaped grooves with the radius of R16mm, and the side surface of the top end is provided with 11mmx9mm reinforcing ribs. The inner wall below the top end is provided with pipe thread with the thread pitch of 4mm and the total length of 10 mm.

At present, the prior art has no forming die for the plastic part.

Therefore, there is a need for a mold for forming an internally threaded cap to solve the above-mentioned problems of the prior art.

Disclosure of Invention

The invention aims to provide an internal thread cover forming die, which is used for solving the problems in the prior art, has a simple and practical structure and reliable mechanism action, and realizes the forming of an internal thread cover.

In order to achieve the purpose, the invention provides the following scheme: the invention provides an internal thread cover forming die, which comprises a die body, wherein the die body comprises a fixed die mechanism and a movable die mechanism, a forming die cavity is arranged between the fixed die mechanism and the movable die mechanism, a formed part is arranged in the forming die cavity, and the formed part is used for forming an internal thread cover plastic part; the forming part comprises a cavity insert, an outer ring core, an inner core and a thread core, wherein the cavity insert and the outer ring core are used for forming the outer wall of the internal thread plastic-covered part, the inner core is used for forming the inner wall of the top of the internal thread plastic-covered part, and the thread core is used for forming the internal thread and the inner wall cylindrical surface of the internal thread plastic-covered part; and the movable die mechanism is also provided with a driving device.

Preferably, four molding cavities are arranged between the fixed die mechanism and the movable die mechanism, one molding part is installed in each molding cavity, and the four molding cavities are arranged in a translation mode.

Preferably, the fixed die mechanism comprises an upper seat plate, a stripper plate and a fixed die plate which are arranged from top to bottom, guide sleeves are arranged on the stripper plate and the fixed die plate, and a fixed die guide column is arranged in each guide sleeve for guiding;

the movable die mechanism comprises a movable die push plate, a movable die plate, a ring fixing plate, a lower base plate and a bottom plate which are sequentially arranged from top to bottom, and the movable die plate, the ring fixing plate and the lower base plate are fixedly combined together through screws and used for installing the threaded core;

the fixed die guide column sequentially penetrates through the upper seat plate, the stripper plate, the fixed die plate, the movable die push plate, the movable die plate, the ring fixing plate, the lower base plate and the bottom plate from top to bottom; the die comprises a die body and is characterized in that a die cavity guide post is further arranged on the die body, and the die cavity guide post sequentially penetrates through the stripper plate, the fixed die plate, the movable die push plate, the movable die plate, the ring-shaped fixing plate, the lower base plate and the bottom plate from top to bottom.

Preferably, the number of the fixed die guide posts and the number of the die cavity guide posts are four, and one fixed die guide post and one die cavity guide post are eccentrically arranged; the top end of the die cavity guide pillar is provided with a vent groove, the depth of the vent groove is 0.5mm, the width of the vent groove is 10mm, and the starting end of the vent groove adopts fillet transition.

Preferably, the cavity insert is a circular ring insert, a forming needle is arranged on the cavity insert, a spot gate is arranged on the cavity insert, and the spot gate is connected with a vertical flow passage; the cavity insert is also provided with an inner straight pipe water channel and an outer wall annular water channel, and cavity sealing rubber rings are arranged above and below the outer wall annular water channel for sealing; the top end of the outer wall of the cavity insert is provided with a circular shoulder, and the cavity insert is tightly pressed and installed in the fixed die plate through an upper pressing plate;

the outer ring mold core is a circular ring-shaped insert, is arranged below the cavity insert, and is fixedly arranged on the movable mold push plate through a lower pressing plate; the outer ring mold core is sleeved on the outer wall of the threaded mold core, and an inner circular hole of the outer ring mold core is in a conical hole shape and is matched with the conical surface of the outer wall of the threaded mold core;

the thread core is sleeved on the outer wall of the inner core through the central inner hole, the top of the inner core is provided with a conical surface, and the top end of the thread core is provided with a conical opening which is used for being matched with the lower end surface of the conical surface; the lower end of the threaded core is provided with an external thread, the external thread and the internal thread of the internal thread cover plastic part have the same thread diameter, the annular fixing plate is provided with a threaded ring, the external thread and the internal thread of the threaded ring are in thread pair matching, and the transmission precision of the thread pair matching is 6 grades;

the inner wall of the threaded mold core is provided with a lower bearing used for being assembled with the inner mold core, the outer wall of the threaded mold core is provided with an upper bearing used for being assembled with an inner hole of the movable mold plate, and the upper bearing and the lower bearing are both provided with oil injection holes; and a mold core positioning rod is connected to the bottom of the threaded mold core.

Preferably, the stripper plate is provided with a stripper plate pneumatic pushing mechanism;

a runner plate is arranged in the middle of the upper seat plate, a runner flange is mounted on the runner plate, a point sprue runner is arranged on the runner flange, and the point sprue runner is communicated with the point sprue; an exhaust groove is formed in the tail end of the point gate runner, the groove depth of the exhaust groove is 0.02mm, and the width of the exhaust groove is the same as that of the point gate runner; the point gate runner comprises a main runner and a branch runner, and the runner sections of the main runner and the branch runner are both trapezoidal sections; and a cooling water channel is arranged on the runner plate.

Preferably, the driving device comprises a driving mechanism, an intermediate transmission gear mechanism and an outer ring core pneumatic pushing mechanism;

the driving mechanism comprises an oil cylinder, a push plate and a square bar rack, the output end of the oil cylinder is connected with the push plate, the square bar rack is fixedly connected with the push plate, and one end of the square bar rack, which is far away from the push plate, is connected with the middle transmission gear mechanism;

the middle transmission gear mechanism comprises a central shaft, an upper gear and a lower gear, the upper gear and the lower gear are coaxially arranged at the upper end and the lower end of the central shaft respectively, the lower gear is in transmission connection with the square rod rack, a core gear is arranged on the outer wall of the threaded core, and the upper gear is in meshing connection with the core gear;

the outer ring core pneumatic pushing mechanism adopts an air cylinder mechanism, the top end of a cylinder rod of the air cylinder mechanism is fastened and assembled with the movable mold push plate through screws, and a cylinder body of the air cylinder mechanism is installed in the movable mold plate and the ring fixing plate.

Preferably, the movable die mechanism is further provided with a die opening and closing control mechanism, and the die opening and closing control mechanism comprises a stripper plate pull rod, a fixed die plate pull rod, a resin sleeve, a sleeve column hook block, an elastic rubber pad and a spreading spring for sequential control.

Preferably, the threaded core and the intermediate transmission gear mechanism are further provided with a lubricating oil inlet.

Preferably, a cooling water path is connected to the inner core.

Compared with the prior art, the invention has the following technical effects:

firstly, the die carrier is opened in5 times by parting by using a novel three-plate die carrier with a multi-plate structure without ejection;

secondly, the die cavity layout uses a movable layout;

the transmission precision of the thread core mechanism and the driving mechanism thereof is 6 grade;

fourthly, preventing the waste material of the flow channel from sticking the die by using a stripper plate pneumatic pushing mechanism;

sixthly, arranging a vent groove at the top end of the guide post of the die cavity to prevent burning, and arranging an eccentric guide post to prevent mistake;

seventhly, ejecting the plastic part by using a pneumatic ejection mechanism to ensure that the plastic part is ejected without damage;

and adding a lubricating system to ensure the service life of the thread-off mechanism.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments 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 without creative efforts.

FIG. 1 is a schematic structural view of an internally threaded cap molding;

FIG. 2 is a schematic structural view of a molding member according to the present invention;

FIG. 3 is a schematic structural diagram of a fixed die mechanism of the invention;

FIG. 4 is a schematic structural diagram of a moving die mechanism of the present invention;

FIG. 5 is a schematic structural view of an internally threaded cap forming die according to the present invention;

FIG. 6 is a schematic diagram of the operation of the female screw cap forming mold according to the present invention;

wherein, 1-oil cylinder; 2-push plate guide post; 3-oil cylinder seat board; 4-a support plate; 5-sleeving a pressure plate on the rod; 6-pushing the plate; 7-square bar rack; 8-side seat plate; 9-position switch; 10-square rod sleeve; 11-a wear plate; m1-drive mechanism; m2-intermediate gear mechanism; r1, R2-flow channel; IN1, IN2, IN3, IN4, IN5, IN 6-Water entry number; out1, Out2, Out3, Out4, Out5, Out 6-water Out number; A1-A4-die cavity number; 12-an upper seat board; 13-stripping plate; 14-guide sleeve; 15-fixing a template; 16-fixing the die guide post; 17-moving die push plate; 18-moving the template; 19-type ring fixing plate; 20-lower backing plate; 21-a bottom plate; 22-a gland; 23-a lower sealing ring; 24 cylinders; 25-an upper sealing ring; 26 cylinder gland bush; 27-cylinder rod sealing ring; 28-cylinder rod; 29-standing; 30-a push block; 31-a pusher spring; 32-pulling the material rod sleeve; 33-card; 34-a material pulling rod; 35-runner flange; P1-P5-die opening surface; 36-cavity insert; 37-stripper plate pull rod; 38-fixed template pull rod; 39-resin jacket; 40-column sleeving; 41-outer ring core; 42-a blocking rubber ring; 43-inner core; 44-an upper bearing; 45-upper snap ring; 46-core gear; 47-gear key; 48-a threaded core; 49-lower bearing; 50-lower snap ring; 51-template screws; 52-a threaded ring; 53-beryllium copper tubes; 54-copper tube sealing ring; 55-hook block; 56-elastic rubber cushion; 57-a spreader spring; 58-upper gear; 59-lower stem; 60-wear resistant rings; 61-rack wearpad; 62-central axis; 63-rack guide bearings; 64-mold cavity guide posts; 65. 68, 73, 74, 76-guide sleeves; 66-central shaft bearing; 67-central shaft lower press plate; a 69-bond; 70-shaft end sealing ring; 71-end face bearing press plate; 72-end face bearing; 75-locking the mold piece.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example one

As shown in fig. 1 to 6, in the present embodiment, a material of an internal thread cap molding part is PC-modified ABS plastic, a shrinkage ratio is 0.56 to 0.59%, the internal thread cap molding part is molded by injection molding, a parting surface of an outer wall of the internal thread cap molding part is parted by a PL surface, and a mold cavity of the internal thread cap molding part is cast by a single-point gate G0. The total output of the internal thread cover plastic part is 100 ten thousand, and the requirements on the die are high output, long service life and convenient operation.

Because the inner wall of the internal thread cover plastic part is provided with the oval groove, the fan-shaped groove and the reinforcing rib, the demoulding of the internal thread can not adopt the conventional mode of 'thread core axial immobility, circumferential rotation and push plate auxiliary push-out' to remove threads, but only adopts the mode of 'thread core axial movement and circumferential rotation' to remove threads.

Thus, in the present embodiment, the molding cavities of the single internally threaded cap molding are designed such that the molding cavities are combined in insert-splicing fashion, as shown in fig. 2. Under PL surface parting, the formed part of the forming die cavity mainly comprises 4 main formed parts such as a cavity insert, an outer ring core, an inner core, a thread core and the like. The mold cavity insert, the outer wall of the outer ring mold core molding plastic part, the inner wall of the top of the inner mold core molding plastic part, and the internal thread and the inner wall cylindrical surface of the threaded mold core molding plastic part; the cavity insert and the outer ring core are made of H13 steel, and the inner core and the threaded core are made of S136 steel.

In this embodiment, the cavity insert is a circular ring insert on which the mold cavity insert is arranged

A small-sized forming needle of the hole is also provided with a single-point gate G0 and a vertical runner thereof; also provided with 1 inner straight pipe water channel and 1 outer wall annular water channel; the outer wall annular water channel is sealed by an upper cavity sealing rubber ring and a lower cavity sealing rubber ring, and the cavity insert is installed in the fixed die plate in a mode of pressing by an upper pressing plate through a circular ring shoulder on the outer wall of the cavity insert.

In this embodiment, the outer ring core is also a circular ring-shaped insert, and is fixedly mounted on the movable die push plate by using the lower pressing plate, and the inner circular hole of the outer ring core is set to be in a conical hole shape and is in conical surface fit with the outer wall of the threaded core.

In this embodiment, the top end of the threaded core is set in a conical mouth form and is matched with the conical surface at the lower end of the top of the inner core, the threaded core is sleeved on the outer wall of the inner core through a central inner hole of the threaded core, the lower end of the threaded core is provided with an external thread which has the same diameter as the internal thread of the internal thread cover plastic part, the matching of the external thread and the internal thread of the threaded ring is thread pair matching, and the transmission precision is grade 6.

In this embodiment, the threaded core is provided with 1 lower bearing on the inner wall to be assembled with the inner core, and 1 upper bearing on the outer wall to be assembled with the inner hole of the die plate (movable die plate) at this position, and the threaded core is driven by the core gear.

In this embodiment, when the mold cavity is closed, the closing precision of the upper end conical surface of the threaded mold core and the lower end conical surface of the top of the inner mold core in the axial direction is ensured by the mold core positioning rod of the axial positioning piece, so as to prevent the threaded mold core from being pushed downwards by the injection pressure of the molten material in the mold cavity to cause an excessively large gap to occur in the conical matching surface, thereby causing glue leakage, and the parts below the PL surface form the threaded core mechanism of the mold cavity.

In the embodiment, the injection molding of the internal thread cover plastic part is combined with the thread core pulling requirement of the thread core, and a novel ejector-free movable mould multi-plate structure three-plate mould base is used for bearing a functional machine component, so that the automatic production of the plastic part is realized.

As shown in FIG. 3, the molding cavity layout of the internal thread cover molding piece is 1 mold and 4 cavities, wherein the 4 cavities are respectively A1, A2, A3 and A4 cavities, and the basic structure of the fixed mold mechanism is different from that of a common three-plate mold in that:

1. the plastic parts formed by the four forming die cavities need to have consistency, and the same internal thread starting points need to be ensured, so that the placing positions of the internal thread cover plastic parts in the forming die cavities need to be consistent, the arrangement of the four cavities needs to adopt a translation mode, and cannot adopt an axial symmetry or mirror image mode.

2. In order to prevent the runner waste from sticking to the mold, the runner waste is subjected to auxiliary demolding by using a pneumatic pushing mechanism in addition to pushing out the demolding by using a stripper plate, so that 1 stripper plate pneumatic pushing mechanism (stripper plate pneumatic pushing mechanisms T1-T4) is arranged on the stripper plate corresponding to the position of a material pulling rod of a single molding mold cavity.

3. The tail end of the point gate runner is provided with an exhaust groove, the groove depth is 0.02mm, the width is the same as the runner width, the runner sections of the main runner R1 and the branch runner R2 both use trapezoidal sections, the upper edge of the R1 runner is 8mm, the height is 6mm, the inclination is 20 degrees, the upper edge of the R2 runner is 7mm, the height is 5mm, and the inclination is 20 degrees.

4. IN order to ensure the rapid solidification of the runner waste, the runner plate is also provided with a water channel for enhancing cooling, and the numbers of the pipelines are IN5-Out5 and IN6-Out6 respectively.

5. When the mould is closed, in order to prevent the die cavity guide pillar from burning, the vent groove is required to be formed at the position of the guide pillar on the lower bottom surface of the panel corresponding to the top end position of the die cavity guide pillar, the depth of the vent groove is 0.5mm, the width of the vent groove is 10mm, and the starting end uses a fillet for transition, so that the processing is convenient.

6. When the fixed template and the movable template are closed, 4 waist-shaped fine positioning blocks are required to be arranged to enhance the positioning precision during closing, and the grooves of the waist-shaped fine positioning blocks are arranged in the horizontal direction and the vertical direction.

7. In order to prevent the misassembly of the die during the assembly, 1 guide pillar is arranged in4 fixed die plate guide pillars and 4 die cavity guide pillars respectively and eccentrically.

In this embodiment, the movable mold mechanism layout is set based on the functional operation requirements of the outer ring core, the inner core, the threaded core, and the threaded core drive mechanism for 4-cavity molding. In the arrangement of the movable mold mechanism, in addition to the 4 screw cores, a screw core driving mechanism M1, a middle transmission gear mechanism M2, 4 outer ring core pneumatic pushing mechanisms (N1 to N4 mechanisms), a lubricating system, an inner core cooling mechanism, and a mold opening/closing control means need to be provided.

In this embodiment, the driving mechanism M1 is a precision cylinder rack driving mechanism, and mainly includes a cylinder 1, a push plate guide pillar 2, a cylinder seat plate 3, a support plate 4, a rod sleeve pressing plate 5, a push plate 6, a square rod rack 7, a side seat plate 8, a position switch 9, a square rod sleeve 10, and a wear plate 11, the cylinder 1 drives the push plate 6 to push the square rod rack 7 to move, the square rod rack 7 drives the middle gear mechanism M2 to rotate, and the middle transmission gear mechanism M2 is used for driving a core gear to rotate synchronously.

In the present embodiment, the intermediate transmission gear mechanism M2 is composed of two upper and lower coaxial gears.

In the embodiment, the outer ring core pneumatic push-out mechanisms N1-N4 are used for driving the movable die push plate and 4 outer ring cores on the movable die push plate to eject and reset, so that the internal thread cover molding piece is demoulded from 4 inner ring cores; the ejection force of the movable die push plate can be adjusted, and the plastic part is prevented from being ejected to be damaged by overlarge ejection force.

In this embodiment, in order to prevent the reduction of the transmission accuracy due to the wear of the 4 threaded cores and the intermediate transmission gear mechanism M2, the rotating parts of the 5 mechanisms are lubricated by using lubricating oil, and the corresponding 5 lubricating oil inlets are the oil filler holes 1# to 5 #.

IN this embodiment, the inner cores of the A1 and A2 cavities share an IN1-Out1 pipeline for cooling, and the inner cores of the A3 and A4 cavities share an IN2-Out2 pipeline for cooling.

In the present embodiment, the mold opening mechanism of the mold opening and closing control device performs sequential control using mechanical members such as tie rods, resin shutters, rubber pads, and springs.

The whole assembly of the die body in this embodiment is as follows:

the fixed die mechanism and the movable die mechanism are assembled together, as shown in fig. 5, the fixed die mechanism of the die set is composed of an upper seat plate 12, a stripper plate 13 and a fixed die plate 15, the stripper plate 13 and the fixed die plate 15 are respectively provided with guide sleeves, and the guide sleeves are guided by a fixed die guide post 16. The movable mould mechanism of the mould frame is composed of a movable mould push plate 17, a movable mould plate 18, a ring fixing plate 19, a lower backing plate 20 and a bottom plate 21, and is different from the movable mould frame of a common three-plate mould. In the movable die mechanism, an ejector pin push plate mechanism is not arranged, and in the movable die mechanism, a die plate 18, a ring fixing plate 19 and a lower backing plate 20 are fixedly combined together through screws and used for installing 4 threaded cores. The base plate 21 is used for mounting the driving mechanism M1.

In the embodiment, the mold frame is opened for 5 times, the mold frame is opened at the surfaces P1-P5 respectively, and the positioning rod of the mold core is removed at the surface P1 for the first time to position and lock the threaded mold core; second separation of the pin-point gate from the female cap molding at the P2 plane; thirdly, the stripper plate 13 is used for pushing the internal thread plastic cover piece out of the material pulling rod 34 at the surface P3; fourth opening of the molding cavity at plane P4 (PL land); and the fifth time, the push plate 17 of the movable mould is used for ejecting the internal thread cover molding piece from the internal core at the surface P5.

In this embodiment, the outer ring core pneumatic pushing mechanisms N1 to N4 have the same structure, and take the structure of the outer ring core pneumatic pushing mechanism N1 as an example, the components thereof include a gland 22, a lower seal ring 23, a cylinder 24, an upper seal ring 25, a cylinder gland 26, a cylinder rod seal ring 27 and a cylinder rod 28, and are assembled to form a cylinder mechanism, and the top end of the cylinder rod 28 is fastened and assembled with the movable mold push plate 17 through screws; the cylinder body is arranged in a cavity groove formed in the combination plate of the plate 18 and the plate 19.

In this embodiment, the stripper plate pneumatic pushing mechanisms T1 to T4 take the stripper plate pneumatic pushing mechanism T4 of the a4 cavity as an example, when the mold body is opened on the P2 side, the runner scraps and the female screw cap molding pieces are broken at the position of the gate, then the P3 side is opened, and the stripper plate 13 pushes the runner scraps out from the lower end of the pulling rod 34 and the main runner of the gate flange 35, but at this time, the horizontal runner scraps are often adhered to the lower bottom surface of the stripper plate 17 and sometimes cannot be completely separated, so the pneumatic pushing mechanism T4 is provided to push the horizontal runner scraps away from the lower bottom surface of the stripper plate 17. The components of the pneumatic pushing mechanism T4 mainly comprise a pushing block 30, a pushing block spring 31, a material pulling rod sleeve 32 and a clamping piece 33, and the pushing block 30 is pushed out by the high-pressure gas and the spring 31 together by injecting the high-pressure gas into the air charging duct 4.

In this embodiment, the mold opening and closing control mechanism is, as shown in fig. 6, controlled by the following mechanism members, the opening of the surfaces P1 to P5 being controlled by the stripper plate pull rod 37, the fixed die plate pull rod 38, the resin sleeve 39 and the sleeve column 40 being used for controlling the surfaces P2, P3 and P4 of the fixed die mechanism; the hook block 55, the elastic rubber pad 56 and the expanding spring 57 are used for controlling the surface P1, and the outer ring core pneumatic push-out mechanisms N1-N4 are used for controlling the surface P5.

In the embodiment, the threaded core comprises a piece 42 to a piece 54, and the upper bearing 44 and the lower bearing 49 are provided with corresponding oil filling holes for filling oil to the threaded core to prevent abrasion; the intermediate transmission gear mechanism M2 includes pieces 58 to 63, pieces 66, pieces 67, and pieces 69 to 72.

In this embodiment, the core gear 46, the upper gear 58, and the center shaft 62 are all manufactured with Cr40 to a manufacturing accuracy of 6 steps, and 3 bearing oil holes and one lower end gear oil hole are provided in the center shaft 62.

As shown in fig. 5 and 6, the working principle of the die body in this embodiment is as follows:

firstly, closing the closed injection mold, and waiting for opening the mold after the injection molding machine completes injection molding of the mold cavity.

And secondly, opening the movable die of the injection molding machine by the P1 surface, pulling the movable die of the die to move downwards, opening the die at the P1 surface under the support of the spreading spring 57, and leaving the core positioning rod shown in the figure 5 away from the lower end of the threaded core 48 to make room for the axial downward movement of the threaded core 48 when the core positioning rod is opened, so that the axial limiting action of removing the threaded core is completed. After the opening distance of the P1 surface is 30mm, the hook block 55 pulls the lower backing plate 20, and the bottom plate 21 pulls the template above the P1 surface to continue descending.

And thirdly, when the moving die of the die is opened on the surface P2 and moves downwards, the die is opened on the surface P2 due to the action of the resin sleeve 39 and the sleeve column 40, so that the plastic part is separated from the waste material, and the breaking action of the pouring gate is completed. The P2 face is open a distance of 45 mm.

And fourthly, opening the movable die on the surface P3 to continue descending, scraping the runner waste from the material pulling rod 34 by the stripper plate 13 when the surface P3 is opened, and simultaneously, actuating a pneumatic push-out mechanism (T1-T4) to ensure that the runner waste is stripped from the stripper plate 13 so as to realize the demolding of the runner waste. The P3 face is open a distance of 15 mm.

And (6) when the movable die with the P4 surface is opened and continues to descend, the die is opened at the P4 surface due to the closing of the N1-N4 outer ring core pneumatic push-out mechanism, so that the die cavity is opened, the plastic part is left on the movable die, and the opening action of the die cavity is finished. Thereafter, the drive mechanism M1 operates to drive the screw core 48 to move downward while rotating the core back under the guide of the screw ring 52, thereby completing the screw core back operation. The P2 faces were open a distance of 55 mm.

And sixthly, opening the pneumatic push-out mechanism of the outer ring core from N1 to N4 on the P5 surface to push the movable mould push plate and the outer ring core 41 on the movable mould push plate to push the plastic part out of the inner ring core 43 for demoulding, so that the plastic part is completely demoulded. And (5) the plastic part is pushed out and demoulded to finish the action. The P2 face is open a distance of 15 mm.

And resetting according to the reverse sequence of the die opening process in the resetting and resetting process, closing the die and waiting for the next injection molding cycle.

The internal thread cover plastic part is molded by adopting the improved three-plate mold so as to meet the production requirements of high yield, long service life, convenient operation and the like of the internal thread plastic part, and the layout of the mold cavity is 1 mold and 4 cavities.

The movable die mechanism is not provided with an ejection mechanism, is improved into a 5-die-plate combined structure, and is convenient for installation of the threaded core mechanism, the driving mechanism, the intermediate gear mechanism and the outer ring core pneumatic ejection mechanism. The mould body divides 5 times the somatotype to open, and the 5 action needs of moulding piece and runner drawing of patterns are moulded to the correspondence, and 5 actions are respectively: removing the axial limit of the threaded core, breaking the pouring gate, demolding the runner waste, opening the mold cavity, and pushing out the plastic part for demolding.

In order to meet the requirements of high yield and long service life of the die, the invention has the following improvement points that: firstly, the die carrier is opened in5 times by parting by using a novel three-plate die carrier with a multi-plate structure without ejection; secondly, the die cavity layout uses a movable layout; the transmission precision of the thread core mechanism and the driving mechanism thereof is 6 grade; fourthly, preventing the waste material of the runner from sticking the die by using a pneumatic push-out mechanism; sixthly, arranging a vent groove at the top end of the guide post of the die cavity to prevent burning, and arranging an eccentric guide post to prevent mistake; seventhly, ejecting the plastic part by using a pneumatic ejection mechanism to ensure that the plastic part is ejected without damage; and adding a lubricating system to ensure the service life of the thread-off mechanism.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. The utility model provides an internal thread lid forming die which characterized in that: the die comprises a die body, wherein the die body comprises a fixed die mechanism and a movable die mechanism, a forming die cavity is arranged between the fixed die mechanism and the movable die mechanism, a formed part is arranged in the forming die cavity, and the formed part is used for forming an internal thread cover plastic part; the forming part comprises a cavity insert, an outer ring core, an inner core and a thread core, wherein the cavity insert and the outer ring core are used for forming the outer wall of the internal thread plastic-covered part, the inner core is used for forming the inner wall of the top of the internal thread plastic-covered part, and the thread core is used for forming the internal thread and the inner wall cylindrical surface of the internal thread plastic-covered part; and the movable die mechanism is also provided with a driving device.

2. The mold for forming an internally threaded cap according to claim 1, wherein: four molding cavities are arranged between the fixed die mechanism and the movable die mechanism, one molding part is installed in each molding cavity, and the four molding cavities are arranged in a translation mode.

3. The mold for forming an internally threaded cap according to claim 1, wherein: the fixed die mechanism comprises an upper seat plate, a stripper plate and a fixed die plate which are arranged from top to bottom, guide sleeves are arranged on the stripper plate and the fixed die plate, and fixed die guide pillars are arranged in the guide sleeves for guiding;

4. The mold for forming an internally threaded cap according to claim 3, wherein: the number of the fixed die guide columns and the number of the die cavity guide columns are four, and one fixed die guide column and one die cavity guide column are arranged eccentrically; the top end of the die cavity guide pillar is provided with a vent groove, the depth of the vent groove is 0.5mm, the width of the vent groove is 10mm, and the starting end of the vent groove adopts fillet transition.

5. The mold for forming an internally threaded cap according to claim 3, wherein: the cavity insert is a circular ring-shaped insert, a forming needle is arranged on the cavity insert, a spot gate is arranged on the cavity insert, and the spot gate is connected with a vertical flow passage; the cavity insert is also provided with an inner straight pipe water channel and an outer wall annular water channel, and cavity sealing rubber rings are arranged above and below the outer wall annular water channel for sealing; the top end of the outer wall of the cavity insert is provided with a circular shoulder, and the cavity insert is tightly pressed and installed in the fixed die plate through an upper pressing plate;

6. The mold for forming an internally threaded cap according to claim 5, wherein: the stripper plate is provided with a stripper plate pneumatic pushing mechanism;

7. The mold for forming an internally threaded cap according to claim 1, wherein: the driving device comprises a driving mechanism, an intermediate transmission gear mechanism and an outer ring core pneumatic pushing mechanism;

8. The mold for forming an internally threaded cap according to claim 1, wherein: the movable mould mechanism is also provided with a mould opening and closing control mechanism, and the mould opening and closing control mechanism comprises a stripper plate pull rod, a fixed mould plate pull rod, a resin sleeve, a sleeve column hook block, an elastic rubber pad and a spreading spring for sequential control.

9. The mold for forming an internally threaded cap according to claim 1, wherein: and the threaded core and the intermediate transmission gear mechanism are also provided with a lubricating oil inlet.

10. The mold for forming an internally threaded cap according to claim 1, wherein: and the inner core is connected with a cooling water path.