CN113059757B

CN113059757B - Internal thread cover forming die

Info

Publication number: CN113059757B
Application number: CN202110301164.8A
Authority: CN
Inventors: 肖国华
Original assignee: Shenzhen Jiayushun Technology Co ltd
Current assignee: Shenzhen Jiayushun Technology Co ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2022-10-25
Anticipated expiration: 2041-03-22
Also published as: CN113059757A

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 a reinforcing rib with the radius of 11mmx9 mm. The inner wall below the top end is provided with pipe thread with the thread pitch of 4mm and the total length of 10mm.

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 covering part, the inner core is used for forming the inner wall of the top of the internal thread plastic covering part, and the thread core is used for forming the internal thread and the inner wall cylindrical surface of the internal thread plastic covering part; and the movable die mechanism is also provided with a driving device.

Preferably, four molding cavities are arranged between the fixed mold mechanism and the movable mold 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 post 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 mounting the threaded core;

the fixed die guide post 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 pillar is further arranged on the die body and sequentially penetrates through the stripper plate, the fixed die plate, the movable die push plate, the movable die plate, the ring fixing plate, the lower backing 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 is in round corner 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:

(1) the die carrier is opened in 5-time parting by using a novel three-plate die carrier with a non-ejection multi-plate structure;

(2) the die cavity layout uses a movable layout;

(3) the transmission precision of the thread type core mechanism and the driving mechanism thereof is 6 grades;

(4) the pneumatic pushing mechanism of the stripper plate is used for preventing the waste material of the runner from sticking the die;

(6) the top end of the die cavity guide post is provided with a vent groove for preventing burning, and an eccentric guide post is arranged for preventing mistake;

(7) ejecting the plastic part by using a pneumatic ejection mechanism to ensure that the plastic part is ejected without damage;

(8) the lubricating system is additionally arranged to ensure the service life of the thread removing 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-a drive mechanism; m2 — an intermediate gear mechanism; r1 and R2-flow passages; IN1, IN2, IN3, IN4, IN5, IN 6-number of water inflow; out1, out2, out3, out4, out5, out 6-water outlet number; A1-A4-number of die cavity; 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; a 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; 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 the internal thread cap molding part is PC-modified ABS plastic, the shrinkage 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 pouring gate G0 and a vertical runner thereof; is also provided with1 internal straight pipe water channel and 1 outer wall annular water channel are arranged; 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 moving 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 the embodiment, the top end of the threaded core is arranged in a conical opening 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 outer thread which has the same diameter as the inner thread of the inner thread cover plastic part, the matching of the outer thread and the inner 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 template (movable template) at the 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 die cavity layout of the internal thread cover molding part is 1 die 4 cavities, the 4 cavities are respectively A1, A2, A3 and A4 cavities, and the basic structure of the fixed die mechanism is different from that of a common three-plate die 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 pouring gate runner is required to be 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 are all trapezoidal sections, the upper side of the R1 runner is 8mm, the height is 6mm, the inclination is 20 degrees, the upper side of the R2 runner is 7mm, the height is 5mm, and the inclination is 20 degrees.

4. IN order to ensure the quick solidification of the runner waste, a water channel is also arranged on the runner plate for enhancing cooling, and the serial 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 moving die mechanism arrangement, in addition to the 4 screw cores, a screw core driving mechanism M1, an intermediate 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 member need to be provided.

In this embodiment, the driving mechanism M1 is a precision type oil cylinder rack driving mechanism, and mainly includes an oil cylinder 1, a push plate guide pillar 2, an oil 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 an abrasion-resistant plate 11, the oil cylinder 1 drives the push plate 6 to push the square rod rack 7 to move, the square rod rack 7 drives the intermediate gear mechanism M2 to rotate, and the intermediate gear mechanism M2 is used for driving a core gear to rotate synchronously.

In the present embodiment, the intermediate gear mechanism M2 is constituted by upper and lower coaxial gears.

In the embodiment, the outer ring core pneumatic push-out mechanisms N1 to 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 inner thread cover molding piece is demoulded from 4 inner 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 cavities A1 and A2 share the IN1-Out1 pipe for cooling, and the inner cores of the cavities A3 and A4 share the IN2-Out2 pipe 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 drive mechanism M1.

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

In this embodiment, the outer ring core pneumatic pushing mechanisms N1 to N4 have the same structure, and the components of the outer ring core pneumatic pushing mechanism N1 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, which 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 by 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, taking 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 scrap and the internal thread cover molding are broken at the position of the gate, then the P3 side is opened, the stripper plate 13 pushes the runner scrap out of the lower end of the pulling rod 34 and the main runner of the gate flange 35, but at this time, the horizontal runner scrap is often adhered to the 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 scrap away from the 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 high-pressure gas and the spring 31 together by injecting the high-pressure gas into the air charging channel 4.

In this embodiment, the mold opening and closing control mechanism is as shown in fig. 6, the opening of the surfaces P1 to P5 is controlled by the following mechanism parts, and the stripper plate pull rod 37, the fixed die plate pull rod 38, the resin sleeve 39 and the sleeve column 40 are 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 made of Cr40 with a manufacturing accuracy of 6 steps, and the center shaft 62 is provided with oil holes for 3 bearings and one oil hole for the lower end gear.

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

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

(2) The movable die of the injection molding machine is pulled to move downwards by opening the P1 surface, the die is firstly opened at the P1 surface under the opening of the opening spring 57, and when the position is opened, the die core positioning rod shown in figure 5 leaves the lower end of the threaded die core 48 to make room for the axial downward movement of the threaded die core 48, so that the axial limiting action for removing the threaded die 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.

(3) When the movable mold of the P2 opening mold descends, the mold is opened at the P2 surface under 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 sprue breaking action is completed. The P2 plane is opened by 45mm.

(4) The moving die is opened on the P3 surface and continues to move downwards, when the P3 surface is opened, the stripper plate 13 scrapes the runner waste from the material pulling rod 34, and meanwhile, the pneumatic push-out mechanism (T1-T4) acts to ensure that the runner waste is stripped from the stripper plate 13, so that the stripping of the runner waste is realized. The P3 plane is open by 15mm.

(5) When the movable mold with the P4 surface opened continues to descend, the mold is opened at the P4 surface due to the closing of the N1-N4 outer ring core pneumatic push-out mechanisms, so that the mold cavity is opened, the plastic part is left on the movable mold, and the opening action of the mold cavity is completed. Thereafter, the drive mechanism M1 operates to drive the screw core 48 to move down while rotating the core back under the guidance of the screw ring 52, thereby completing the screw core back operation. The P2 plane is opened by 55mm.

(6) And opening the N1-N4 outer ring core pneumatic push-out mechanism on the P5 surface to act, pushing the movable die push plate and the outer ring core 41 on the movable die push plate to push the plastic part out of the inner core 43 for demolding, and realizing the complete demolding of the plastic part. And (5) the plastic part is pushed out and demoulded to finish the action. The P2 plane is open by 15mm.

(7) 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, corresponds 5 action needs of moulding a piece and runner drawing of patterns, 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: (1) the die carrier is opened in 5-time parting by using a novel three-plate die carrier with a non-ejection multi-plate structure; (2) the die cavity layout uses a movable layout; (3) the transmission precision of the thread type core mechanism and the driving mechanism thereof is 6 grades; (4) a pneumatic push-out mechanism is used for preventing the runner waste from sticking the die; (6) the top end of the die cavity guide post is provided with a vent groove for preventing burning, and an eccentric guide post is arranged for preventing mistake; (7) ejecting the plastic part by using a pneumatic ejection mechanism to ensure that the plastic part is ejected without damage; (8) the lubricating system is additionally arranged to ensure the service life of the thread removing 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 molding die cavity is arranged between the fixed die mechanism and the movable die mechanism, a molded part is installed in the molding die cavity, and the molded part is used for molding an internal thread cover molding 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; the movable die mechanism is also provided with a driving device;

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;

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 body is also provided with a die cavity guide pillar, and the die cavity guide pillar 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;

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;

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 internally threaded cap forming die according to claim 1, 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 is in round corner transition.

4. The mold for forming an internally threaded cap according to claim 1, wherein: the stripper plate is provided with a stripper plate pneumatic pushing mechanism;

5. The internally threaded cap forming die 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;

the driving mechanism comprises an oil cylinder, a push plate and a square rod rack, the output end of the oil cylinder is connected with the push plate, the square rod rack is fixedly connected with the push plate, and one end, far away from the push plate, of the square rod rack is connected with the intermediate 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 respectively and coaxially arranged at the upper end and the lower end of the central shaft, 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;

6. The mold for forming an internally threaded cap according to claim 1, wherein: the movable die mechanism is also provided with a die opening and closing control device, and the die opening and closing control device 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.

7. The mold for forming an internally threaded cap according to claim 5, wherein: and the threaded core and the intermediate transmission gear mechanism are also provided with a lubricating oil inlet.

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