CN117704167A - Secondary injection molding composite flange, injection molding device and method - Google Patents

Abstract

The invention relates to the field of injection molding manufacturing, in particular to a secondary injection molding composite flange, an injection molding device and a method. The secondary injection molding composite flange comprises a first molding body, wherein the first molding body comprises a pipe body inner core and a connecting disc, the connecting disc is arranged at one end of the pipe body inner core, and a mounting hole is formed in the connecting disc; the reinforcing spring is sleeved outside the inner core of the pipe body, and the second molded body comprises a pipe body sleeve which is integrally coated outside the reinforcing spring and the inner core of the pipe body; the first molded body has a hardness greater than that of the second molded body. By compounding two injection molding materials and embedding the reinforcing springs, the novel plastic composite material has the advantages of multiple performance advantages and good reliability. In addition, during injection molding, the insert reinforcing spring is firstly placed in the mold, and then injection molding is carried out once and twice, so that a finished product can be directly obtained, and the injection molding device has the advantage of high injection molding efficiency.

Description

Secondary injection molding composite flange, injection molding device and method

Technical Field

The invention relates to the field of injection molding manufacturing, in particular to a secondary injection molding composite flange, an injection molding device and a method.

Background

The injection molded pipeline connecting flange has wide application range, and particularly in the field of automobile manufacture, covers a plurality of fields such as an engine system, a cooling system, a fuel system, an exhaust system and the like. The novel high-performance oil-saving environment-friendly composite material has the advantages of light weight, corrosion resistance, low cost and the like, and meets the requirements of light weight, high performance, oil saving and environment friendliness in the field of automobile manufacturing. When the flange is applied to high vibration working conditions such as automobiles, the flange has higher requirements on the performances such as shock resistance, impact resistance, sealing performance and strength of flange parts in order to ensure the safety. The traditional injection flange part adopts single material injection molding, is limited by the limitation of single material performance, and is difficult to combine the various performances. Therefore, injection molded flanges that enable composite materials with complementary material performance advantages are under development.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the secondary injection molding composite flange, which combines various performance advantages by compounding two injection molding materials and embedding the reinforcing spring, and has the advantage of good reliability.

In order to achieve the above object, the present invention is realized by the following technical scheme: a two shot composite flange comprising:

The first molding body comprises a pipe body inner core and a connecting disc, wherein the connecting disc is arranged at one end of the pipe body inner core, and a mounting hole is formed in the connecting disc; the reinforcing spring is sleeved outside the inner core of the pipe body, and the second molded body comprises a pipe body sleeve which is integrally coated outside the reinforcing spring and the inner core of the pipe body; the first molded body has a hardness greater than that of the second molded body.

Based on the device, the corresponding pipe body inner core and the connecting disc are made of relatively hard materials so as to ensure the strength of the flange, and the pipe body sleeve coated on the outer side of the pipe body inner core is made of relatively elastic materials so as to improve the shock absorption effect and the tightness connected with the sleeve pipe body. Preferably, the material of the first molded body is selected from hard PVC, and the material of the second molded body is selected from thermoplastic fluororubber FKM. In addition, the reinforcing spring is sleeved outside the inner core of the inner pipe body in the pipe body sleeve, so that the radial shock resistance of the flange corresponding to the pipe body can be improved, and the performance of the composite flange is further improved. Therefore, the secondary injection molding composite flange has the advantages of good reliability by compounding two injection molding materials and embedding the reinforcing springs, and considering various performance advantages.

Further, according to the secondary injection molding composite flange, one end of the pipe body sleeve, far away from the annular connecting part, is radially and inwards extended to form a group of first convex parts, one group of first convex parts are circumferentially arranged at intervals, and correspondingly, one end of the pipe body inner core, far away from the connecting disc, is provided with a group of second convex parts which are radially and outwards extended, and one group of second convex parts are embedded at intervals of the group of first convex parts;

the reinforcing spring is disposed between the second boss and the land. As a preferred solution of the present application, after injection molding, the hard connecting disc and the second protrusion are used for axially positioning the reinforcement spring. And moreover, the first convex part and the second convex part are mutually embedded at intervals, so that the tightness of the connection of the inner core of the pipe body and the pipe body sleeve at the end part can be improved. In addition, during injection molding, the mold core piece corresponding to the first convex part can realize axial positioning on the end part of the reinforcing spring.

Further, the application of the secondary injection molding composite flange, the second molding body radially outwards extends at one end of the pipe body sleeve to form an annular connecting portion, and the annular connecting portion is embedded on the end face of one side of the connecting disc, which is close to the inner core of the pipe body. As the preferred scheme of this application, external pipe fitting axial conflict when connecting disc terminal surface, can promote axial leakproofness.

Further, the application of the secondary injection molding composite flange, the outer lateral surface of the annular connecting part is provided with threads. As a preferable mode of the present application, the reliability of the annular connecting portion embedded in the connecting disc can be improved.

An injection molding device: the secondary injection molding composite flange comprises a core assembly, wherein a molding cavity which is suitable for an injection molding piece is arranged in the core assembly;

the core assembly comprises a fixed mold core assembly and a core piece, wherein the core piece is integrally cylindrical, and the outer side wall of the core piece is used for forming the inner core wall of the pipe body; the movable model core assembly comprises a core tube, wherein the core tube is used for forming the inner wall of a tube body sleeve, and the core tube is sleeved on a core piece; the movable model core assembly further comprises an annular forming plate which is sleeved outside the core pipe, and the annular forming plate is matched with the shape of one side of the pipe body, which is sleeved near the connecting disc; the first driving assembly is in driving connection with the core tube and the annular forming plate, and is used for driving the core tube and the annular forming plate to axially move to a first forming position and a second forming position so as to realize the switching of the integral shapes of the second forming body and the first forming body corresponding to the forming cavity; still include fixed die fixed subassembly and movable mould fixed subassembly, fixed die core subassembly installs on fixed die fixed subassembly, movable mould core subassembly and first drive assembly install on movable mould fixed subassembly, movable mould fixed subassembly can horizontal migration in order to realize core subassembly switching.

Based on the above device, it should be noted that the injection molding temperature of the first molding body is lower than that of the second molding body, specifically, the material of the first molding body may be hard PVC, and the material of the second molding body may be thermoplastic fluororubber FKM.

When the core tube and the annular forming plate move to a first forming position, the forming cavity is blocked by the core tube and the annular forming plate into a cavity which is matched with the shape of the second forming body, and the annular forming plate is used for forming one end of the pipe sleeve close to the connecting disc; when the core pipe and the annular forming plate move to the second forming position, the core pipe integrally moves to one end of the core piece, the annular forming plate is used for forming the bottom area of the connecting disc, and the shape of the forming cavity is matched with that of the composite flange integrally. Therefore, the shape of the molding cavity corresponding to the second molding body and the shape of the first molding body can be switched, and the first molding body is molded after the second molding body is molded. After the second molding is finished, the second molding in the molding cavity is not required to be taken out, the first driving assembly drives the core tube and the annular molding plate to be converted into the second molding position, the molded second molding becomes the core, and the shape of the molding cavity is matched with that of the first molding. Therefore, secondary injection molding can be performed to improve injection molding efficiency.

Further, the application an injection molding device, cover die core subassembly is including the cover body core of corresponding shaping piece lateral wall, cover body type core is including the sleeve of corresponding body cover outer wall.

Further, the application an injection molding device, move the shaping board of mould core subassembly bottom including corresponding shaping connection pad, be equipped with on the shaping board and form the slotted hole that the shaping board shape suited with the ring, when the annular shaping board removes to the second shaping position, the annular shaping board is inlayed and is located in the slotted hole. As a preferred embodiment of the present application, in particular, the annular forming plate is moved to the second forming position with its forming surface coplanar with the forming plate. When the annular forming plate moves to the first forming position, the annular forming plate is integrally arranged on the inner side of the forming plate.

Further, the application an injection molding device, fixed subassembly of movable mould is including first mounting panel and the second mounting panel that the interval set up, the shaping board is installed on first mounting panel, first drive assembly is including installing the actuating cylinder on the second mounting panel, actuating cylinder telescopic assembly is connected with the core pipe. As a preferred embodiment of the present application, the axial movement of the mandrel is driven by a driving cylinder to effect switching between the first and second molding positions. Specifically, the telescopic rod of the driving cylinder is coaxial with the core tube and is arranged at the end part of the core tube.

Further, in the injection molding device of the present application, the first driving assembly includes a sliding frame, the sliding frame includes a sliding plate and a set of first guide rods, the sliding plate and the annular molding plate are arranged at intervals, the set of first guide rods is installed on one side of the annular molding plate far away from the molding cavity, and the sliding plate is installed on the set of first guide rods;

a second guide rod is arranged between the first mounting plate and the second mounting plate, and the sliding plate is arranged on the second guide rod in a sliding manner; the outer side wall of the core tube is provided with a driving plate which is arranged on a group of first guide rods in a sliding manner, and the driving plate is arranged between the sliding plate and the annular forming plate; the drive plate is used for pushing the sliding plate or the annular forming plate along with the movement process of the core pipe so that the annular forming plate moves to the first forming position or the second forming position.

As a preferred embodiment of the present application, it is thus possible to switch between the first and second molding positions of the core tube and the annular molding plate in which different strokes are achieved by one drive cylinder. The switching efficiency can be improved and the structure is compact.

An injection molding method of a composite flange, which uses the injection molding device, comprises the following steps of;

Step S1: resetting, wherein in an initial state, the core tube and the annular forming plate move to a first forming position, and the movable die fixing assembly moves to the opening of the core assembly; step S2: the spring is sleeved, and the reinforcing spring is sleeved on the core tube; step S3: the movable mold fixing assembly moves to the mold core assembly to be closed; step S4: performing primary injection molding, performing injection molding on the molding cavity, and cooling to form a second molding body; the second molded body is coated on the reinforcing spring.

Step S5: the first driving assembly drives the core tube and the annular forming plate to move to a second forming position; s6, a step of S6; performing secondary injection molding, namely performing injection molding on the molding cavity, and cooling to form the secondary injection molding composite flange;

step S7: and opening the die to a reset state, and taking out the formed part.

As the preferred scheme of this application, general injection molding method can accomplish the injection molding of first shaping body earlier, and the die sinking is established reinforcing spring cover on the body inner core, and the injection molding of second shaping body is accomplished to the switching die cavity, and is inefficiency. Based on the method, the insert reinforcing spring is firstly placed in the die, and then injection molding is carried out once and twice, so that a finished product can be directly obtained, and the injection molding method has the advantage of high injection molding efficiency.

The technical scheme can be seen that the invention has the following beneficial effects:

1. the invention provides a secondary injection molding composite flange, which combines various performance advantages by compounding two injection molding materials and embedding a reinforcing spring, and has the advantage of good reliability.

2. The invention provides an injection molding device which can realize the switching of the shapes of a second molding body and a first molding body corresponding to a molding cavity and realize the first molding body after the second molding body is molded. After the second molding is finished, the second molding in the molding cavity is not required to be taken out, the first driving assembly drives the core tube and the annular molding plate to be converted into the second molding position, the molded second molding becomes the core, and the shape of the molding cavity is matched with that of the first molding. Therefore, secondary injection molding can be performed to improve injection molding efficiency.

3. The invention provides a composite flange injection molding method, which comprises the steps of firstly placing an insert reinforcing spring into a mold, and then carrying out primary injection molding and secondary injection molding to directly obtain a finished product.

Drawings

FIG. 1 is an exploded view of a two shot molded composite flange according to one embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of a two-shot molded composite flange according to one embodiment of the present application;

FIG. 3 is a schematic view of an injection molding apparatus according to an embodiment of the present disclosure;

FIG. 4 is a cross-sectional view of an injection molding apparatus (first molding position) according to one embodiment of the present application;

FIG. 5 is an enlarged partial view of the area A of FIG. 4;

FIG. 6 is an enlarged partial view of region B of FIG. 4;

FIG. 7 is a cross-sectional view of an injection molding apparatus (second molding station) according to one embodiment of the present application;

FIG. 8 is an exploded view of a portion of an injection molding apparatus according to one embodiment of the present disclosure;

FIG. 9 is a top view of the fourth mounting plate assembly mounted thereto;

FIG. 10 is a schematic illustration of the connection of the male mold part and the annular drive plate;

FIG. 11 is a schematic view of the injection runner assembly;

FIG. 12 is a cross-sectional view of the injection runner assembly;

fig. 13 is a schematic structural view of the hole injection switching core.

In the figure: 1-a first molded body; 11-a tube inner core; 12-connecting discs; 13-a second protrusion; 2-reinforcing springs; 3-a second molded body; 31-a tube sleeve; a 32-ring connection; 321-screw threads; 33-a first protrusion;

4-a fixed mold core assembly; 40-forming cavity; 41-core piece; 42-sleeve; 422-annular baffles; 43-thread forming sleeve; 431-internal thread; 432-gear; 44-connecting the disc core piece; 45-convex forming part; 451-ring body; 452-molding the protrusions; 453-connection plate; 46-an annular drive plate; 461-connecting rod; 462-a return spring;

5-a moving mold core assembly; 51-core tube; 511-a drive plate; 512-flow passage holes; 52-ring forming a template; 53-forming a plate; 531-slots;

6-a first drive assembly; 61-driving a cylinder; 62-a carriage; 621-sliding plate; 622-first guide bar;

7-a fixed die fixing assembly; 71-a third mounting plate; 72-a drive gear; 74-a fourth mounting plate;

8-a movable die fixing assembly; 81-a first mounting plate; 82-a second mounting plate; 83-a second guide bar;

9-an injection runner assembly; 90-mounting cavity; 901-a first inlet; 902-a second inlet; 903-heat exchange chamber; 91-a first pouring inlet pipe; 910-a first shunt lumen; 911-a first housing; 9111-an open housing; 9112-an annular separator; 92-a second pouring inlet pipe; 920-a second shunt chamber; 921-a second cover; 93-an injection head; 931-connecting head; 9310-injecting a cavity; 9311-a first orifice; 9312-a second orifice; 9313-thread segments; 9314-limit steps; 932-capping; 9320-inlet hole; 934-hole injection switching core; 9341-a first switching core; 9342-a second switching core; 935-compression springs.

Detailed Description

Example 1

The injection molded pipeline connecting flange has wide application range, and particularly in the field of automobile manufacture, covers a plurality of fields such as an engine system, a cooling system, a fuel system, an exhaust system and the like. The novel high-performance oil-saving environment-friendly composite material has the advantages of light weight, corrosion resistance, low cost and the like, and meets the requirements of light weight, high performance, oil saving and environment friendliness in the field of automobile manufacturing. When the flange is applied to high vibration working conditions such as automobiles, the flange has higher requirements on the performances such as shock resistance, impact resistance, sealing performance and strength of flange parts in order to ensure the safety. The traditional injection flange part adopts single material injection molding, is limited by the limitation of single material performance, and is difficult to combine the various performances. Therefore, injection molded flanges that enable composite materials with complementary material performance advantages are under development.

In this regard, as shown in fig. 1 and 2, this embodiment proposes a two-shot composite flange, including:

the pipe body comprises a first molding body 1, wherein the first molding body 1 comprises a pipe body inner core 11 and a connecting disc 12, the connecting disc 12 is arranged at one end of the pipe body inner core 11, and a mounting hole is formed in the connecting disc 12;

the reinforcing spring 2 is sleeved outside the inner core 11 of the pipe body,

the second molded body 3 comprises a pipe body sleeve 31, and the pipe body sleeve 31 is integrally coated on the outer sides of the reinforcing spring 2 and the pipe body inner core 11;

the first molded body 1 has a hardness greater than that of the second molded body 3.

Based on the above device, the corresponding pipe inner core 11 and the connecting disc 12 are made of relatively hard materials to ensure the strength of the flange, and the pipe sleeve 31 coated on the outer side of the pipe inner core 11 is made of relatively elastic materials to improve the shock absorption effect and the tightness of the connection with the sleeve pipe body. Preferably, the material of the first molded body 1 is selected from hard PVC, and the material of the second molded body 3 is selected from thermoplastic fluororubber FKM. In addition, the reinforcing spring 2 is sleeved outside the inner pipe core 11 in the pipe body sleeve 31, so that the radial impact resistance of the flange corresponding to the pipe body can be improved, and the performance of the composite flange can be further improved. Therefore, the secondary injection molding composite flange has the advantages of good reliability by compounding two injection molding materials and embedding the reinforcing spring 2, and considering various performance advantages.

Example 2

On the basis of embodiment 1, as shown in fig. 2, in this embodiment, a set of first protrusions 33 extends radially inward from one end of the pipe body sleeve 31 away from the annular connecting portion 32, a set of first protrusions 33 are circumferentially spaced apart, and correspondingly, a set of second protrusions 13 extending radially outward from one end of the pipe body inner core 11 away from the connecting disc 12 are provided, and a set of second protrusions 13 are embedded in spaced positions of a set of first protrusions 33; the reinforcement spring 2 is disposed between the second protrusion 13 and the connection disc 12.

After injection molding, the hard connecting disc 12 and the second protruding part 13 are used for axially positioning the reinforcement spring 2. The first protrusion 33 and the second protrusion 13 are fitted with a gap therebetween, so that the tightness of the connection between the pipe inner core 11 and the pipe sleeve 31 at the end portions can be improved. In addition, during injection molding, the mold core piece corresponding to the first projection 33 can axially position the end of the reinforcing spring 2.

Further, in this embodiment, the second molded body 3 extends radially outward at one end of the tube housing 31 to form an annular connecting portion 32, and the annular connecting portion 32 is embedded in the end face of the connecting disc 12 near the tube core 11. When the external pipe fitting axially abuts against the end face of the connecting disc 12, the axial sealing performance can be improved.

Further, in this embodiment, the outer side surface of the annular connecting portion 32 is provided with a thread 321. The reliability of the annular connection portion 32 fitted to the connection pad 12 can be improved.

Example 3

An injection molding apparatus as shown in connection with fig. 3, 4 and 7: a method for manufacturing the two-shot composite flange of embodiment 1, comprising, a core assembly having a molding cavity 40 therein adapted to an injection molded part;

the core assembly comprises a fixed mold core assembly 4 and a core piece 41, wherein the core piece 41 is in a cylindrical shape as a whole, and the outer side wall of the core piece 41 is used for forming the inner wall of the inner core 11 of the pipe body; the movable mold core assembly 5 comprises a core tube 51, wherein the core tube 51 is used for forming the inner wall of the tube body sleeve 31, and the core tube 51 is sleeved on the core piece 41; the movable mold core assembly 5 further comprises an annular forming plate 52 sleeved outside the mold core pipe 51, and the annular forming plate 52 is matched with the shape of one side of the pipe body sleeve 31, which is close to the connecting disc 12; the device further comprises a first driving assembly 6, wherein the first driving assembly 6 is in driving connection with the core pipe 51 and the annular forming plate 52, and the first driving assembly 6 is used for driving the core pipe 51 and the annular forming plate 52 to axially move to a first forming position shown in fig. 4 and a second forming position shown in fig. 7 so as to realize the switching of the integral shapes of the forming cavity 40 corresponding to the second forming body 3 and the first forming body 1; still include fixed die fixed subassembly 7 and movable mould fixed subassembly 8, fixed die core subassembly 4 is installed on fixed die fixed subassembly 7, movable mould core subassembly 5 and first drive assembly 6 are installed on fixed subassembly 8 of movable mould, fixed subassembly 8 of movable mould can horizontal migration in order to realize core subassembly switching.

The injection molding temperature of the first molding body 1 is lower than the injection molding temperature of the second molding body 3, specifically, the material of the first molding body 1 may be hard PVC, and the material of the second molding body 3 may be thermoplastic fluororubber FKM.

Based on the above device, when the core tube 51 and the annular forming plate 52 move to the first forming position, the forming cavity 40 is blocked by the core tube 51 and the annular forming plate 52 into a cavity corresponding to the shape of the second forming body 3, and at this time, the annular forming plate 52 is used for forming one end of the pipe body sleeve 31 close to the connecting disc 12; when the core tube 51 and the annular forming plate 52 are moved to the second forming position, the core tube 51 is integrally moved to one end of the core piece 41, the annular forming plate 52 is used for forming the bottom area of the connecting disc 12, and the shape of the forming cavity 40 is matched with that of the composite flange integrally. Therefore, the shape of the molding cavity 40 corresponding to the second molding body 3 and the first molding body 1 can be switched, the first molding body 1 is molded after the second molding body 3 is molded, the second molding body 3 in the molding cavity 40 does not need to be taken out after the second molding body 3 is molded, the core pipe 51 and the annular molding plate 52 are driven by the first driving component 6 to be switched to the second molding position, the molded second molding body 3 becomes a core, and the shape of the molding cavity 40 is adapted to the first molding body 1 at the moment, so that the secondary injection molding can be performed to improve the injection molding efficiency.

Further, in this embodiment, the fixed mold core assembly 4 includes a sleeve core corresponding to the outer wall of the molding member, and the sleeve core includes a sleeve 42 corresponding to the outer wall of the pipe sleeve 31.

As shown in fig. 8, in this embodiment, the movable mold core assembly 5 includes a molding plate 53 corresponding to the bottom of the molding connection disc 12, the molding plate 53 is provided with a slot 531 corresponding to the shape of the annular molding plate 52, and when the annular molding plate 52 moves to the second molding position, the annular molding plate 52 is embedded in the slot 531. Specifically, the annular shaped forming plate 52 is moved to the second forming position with its forming surface coplanar with the forming plate 53. When the annular shaping plate 52 is moved to the first shaping position, the annular shaping plate 52 is entirely inside the shaping plate 53.

In this embodiment, the movable mold fixing assembly 8 includes a first mounting plate 81 and a second mounting plate 82 that are disposed at intervals, the forming plate 53 is mounted on the first mounting plate 81, the first driving assembly 6 includes a driving cylinder 61 mounted on the second mounting plate 82, and the telescopic assembly of the driving cylinder 61 is connected with the core tube 51. The core tube 51 is driven to move axially by the drive cylinder 61 to effect switching between the first and second molding positions. Specifically, the telescopic rod of the driving cylinder 61 is coaxial with the core tube 51 and is mounted at the end of the core tube 51.

As further shown in fig. 3, 4, 5 and 7, in this embodiment, the first driving assembly 6 includes a sliding frame 62, where the sliding frame 62 includes a sliding plate 621 and a set of first guide rods 622, the sliding plate 621 and the annular forming plate 52 are spaced apart, the set of first guide rods 622 is mounted on a side of the annular forming plate 52 away from the forming cavity 40, and the sliding plate 621 is mounted on the set of first guide rods 622; a second guide rod 83 is arranged between the first mounting plate 81 and the second mounting plate 82, and the sliding plate 621 is slidably arranged on the second guide rod 83; the outer side wall of the core tube 51 is provided with a driving plate 511, the driving plate 511 is slidably arranged on a group of first guide rods 622, and the driving plate 511 is arranged between the sliding plate 621 and the annular forming plate 52; the driving plate 511 is used to push the slide plate 621 or the annular forming plate 52 during the movement of the core tube 51 so that the annular forming plate 52 moves to the first or second forming position. Thus, switching of the core tube 51 and the annular forming plate 52 in the first and second forming positions of different strokes by one drive cylinder 61 can be achieved. The switching efficiency can be improved and the structure is compact.

Example 4

For the two-shot composite flange according to embodiment 2, as shown in fig. 5 and 9 in combination with the embodiment 3, in this embodiment, a thread forming sleeve 43 is sleeved at one end of the sleeve 42 near the annular forming plate 52, an internal thread 431 is provided at the inner side of the thread forming sleeve 43, the internal thread 431 is in threaded connection with the outer wall of the sleeve 42, when the annular forming plate 52 is in the first forming position, the internal thread 431 can be screwed until the front end exceeds the sleeve 42 and is attached to the end face of the annular forming plate 52, and at this time, the thread forming sleeve 43 moves axially to the first forming position. The portion of the internal thread 431 that extends beyond the sleeve 42 is the core of the corresponding thread 321. After the injection molding of the second molded body 3 is completed, the core tube 51 is axially moved from the first molding position to the second molding position, and in the process, the core tube 51 may be moved together with the second molded body 3 due to friction force, and the second molded body 3 can be pulled by providing the internal thread 431, so that the second molded body 3 is prevented from axially moving along with the core tube 51.

Further, in this embodiment, as shown in fig. 8, a gear 432 is integrally disposed at an end of the thread forming sleeve 43 away from the ring forming plate 52, a driving gear 72 meshed with the gear 432 is disposed on the fixed mold fixing assembly 7, and the driving gear 72 is provided with a preset thickness so as to adapt to a pair of gears to be meshed all the time in the axial moving process of the thread forming sleeve 43. Specifically, the fixed mold fixing assembly 7 is provided with a driving motor, the upper end of the driving gear 72 is integrally provided with a synchronous pulley, and an output shaft of the driving motor is in transmission connection with the synchronous pulley, so as to realize the rotation driving of the thread forming sleeve 43.

Further, as shown in fig. 4, the fixed mold fixing assembly 7 includes a fourth mounting plate 74, the sleeve-shaped core further includes a connecting disc core piece 44, the connecting disc core piece 44 is mounted on the fourth mounting plate 74, the connecting disc core piece 44 is adapted to the shape of the connecting disc 12, when the thread forming sleeve 43 moves to the first forming position, the thread forming sleeve 43 is threaded on the connecting disc core piece 44, the corresponding connecting disc core piece 44 is provided with a limiting step so as to limit the thread forming sleeve 43 to move towards the annular forming plate 52, and a sealing ring is arranged between the thread forming sleeve 43 and the perforated side wall of the corresponding thread forming sleeve 43 of the connecting disc core piece 44. The annular forming plate 52 is pressed onto the end face of the screw forming sleeve 43 by the first driving assembly 6. The outer side wall of the sleeve 42 is provided with a limit step corresponding to the movement of the thread forming sleeve 43 to the second forming position.

Further, as shown in fig. 7, 8 and 10, in this embodiment, the fixed mold core assembly 4 further includes a protrusion forming member 45, the protrusion forming member 45 includes a ring body 451, the ring body 451 is disposed in the sleeve 42, and a forming protrusion 452 corresponding to the second protrusion 13 is disposed on the inner side of the ring body 451. The male part 45 is moved axially in the sleeve 42 by a driving member to effect switching of the forming male part 452 between the first forming position and the second forming position.

Further, in this embodiment, the thickness of the second protruding portion 13 is adapted to the height of the thread 321, and an annular driving plate 46 sleeved outside the sleeve 42 is disposed at the upper end of the thread forming sleeve 43; the ring body 451 is provided with a group of circumferentially spaced connecting plates 453 on the outer side, the connecting plates 453 radially extend out of the sleeve 42, a group of connecting rods 461 are connected between the annular transmission plate 46 and the connecting plates 453, annular baffle 422 is arranged on the outer side wall of the sleeve 42, the connecting rods 461 are arranged on the annular baffle 422 in a penetrating mode, return springs 462 are sleeved on the connecting rods 461, and two ends of each return spring 462 are respectively abutted to the annular transmission plate 46 and the annular baffle 422. With the above configuration, the male mold member 45 can be axially moved in synchronization with the screw mold sleeve 43, and the screw mold sleeve 43 and the male mold member 45 can be switched between the first molding position and the second molding position by the same driving device. After the secondary injection molding is completed and the mold is opened, the screw thread forming sleeve 43 is driven to axially move towards the first forming position, so that a forming part arranged in the cavity can be ejected, in the process, the convex part forming part 45 is pushed to reset towards the first forming position by the reset spring 462, the operation of synchronously carrying out reset and ejection on the forming part is realized, and the working efficiency is improved. The outer end surface of the first protrusion 33 is slightly higher than the second protrusion 13, and when the secondary injection molding is performed, the protrusion molding member 45 is switched to the second molding position, and the front end of the molding protrusion 452 is located inside the outer end of the first protrusion 33, so as to ensure the tightness of the molding cavity corresponding to the second protrusion 13.

Example 5

Injection molds are a widely used tool in the manufacture of plastic articles. In injection molds, the injection runner is a critical component that effects the injection molding process of the plastic article by directing molten plastic material into the mold cavity. In addition, the injection runner needs to cooperate with the heating module to form a hot runner module to ensure that the plastic material flows uniformly into the mold cavity, avoiding defects caused by uneven flow of molten plastic. The traditional secondary injection mold has the main process that after primary injection molding is finished, a semi-finished product piece is taken out and put into the mold for secondary injection molding, so that the design of a corresponding injection molding runner has no special requirement. In this application, an injection molding process of two injection molding is adopted on one mold, so two injection molding runners are needed for two injection molding, and if two injection molding runners are arranged at intervals, a heating cavity is needed for each injection runner to ensure the flowability of the injected material in the runner. This results in poor compactness of the runner as a whole, increases the occupied space of the mold, and also increases the manufacturing cost.

In this regard, as shown in fig. 5, 11 and 12, the present embodiment provides an injection runner structure of a secondary molding die, including an injection runner assembly 9, the injection runner assembly 9 including:

An axially extending mounting cavity 90, wherein a first inlet 901 and a second inlet 902 are arranged in the mounting cavity 90; a first casting pipe 91 and a second casting pipe 92 are arranged in the mounting cavity 90, and the first casting pipe 91 is arranged in the cavity of the second casting pipe 92; an injection head 93, wherein the injection head 93 comprises a connector 931, the connector 931 is in sealing connection with one end opening of a first casting pipe 91 and a second casting pipe 92, and a first injection hole 9311 and a second injection hole 9312 which are respectively communicated with a pipe cavity of the first casting pipe 91 and a pipe cavity between the first casting pipe 91 and the second casting pipe 92 are arranged on the connector 931; the end of the first pouring inlet pipe 91, which is far away from the injection head 93, extends out of the second pouring inlet pipe 92, and is provided with a first diversion cavity 910, and the first diversion cavity 910 is communicated with a first pouring inlet 901; a second diversion cavity 920 is arranged at one end of the second pouring inlet pipe 92 away from the injection head 93, and the second diversion cavity 920 is communicated with the second pouring inlet 902; a heat exchange cavity 903 is arranged between the installation cavity 90 and the outer wall of the second casting pipe 92.

Based on the device, twice injection molding material sequentially passes through a first injection path: first orifice 9311, first runner tube 91 lumen, first shunt lumen 910, first runner 901, and second injection path: a second orifice 9312, a lumen between the first runner tube 91 and the second runner tube 92, a second split-flow lumen 920, a second runner 902, and thus into the cavity. The application adopts a pair of pipe bodies which are sleeved, the pipe cavity of the second pouring inlet pipe 92 is divided into an inner cavity and an outer cavity, and the inner cavity and the outer cavity are simultaneously arranged in the installation cavity 90, so that two injection molding flow channels share the heat exchange cavity 903, and a heating module can be arranged in the heat exchange cavity 903, and a cooling pipeline can be added to meet the temperature control process of the injection molding process. Therefore, the injection runner structure of the secondary molding die has the advantage of compact structure, and the two injection runners share the heat exchange cavity 903, so that the cost for arranging the heat exchange module can be saved. Specifically, the first pouring inlet pipe 91 and the second pouring inlet pipe 92 are concentrically arranged, the first injection hole 9311 corresponds to the center of the inner end of the injection cavity 9310, and the second injection hole 9312 is arranged radially outside the first injection hole 9311.

As shown in fig. 13, in this embodiment, the connecting head 931 is provided with a cavity 9310 with an open outer end, the injection head 93 further includes a hole switching core 934, including a first switching core 9341 and a second switching core 9342 for switching, where the first switching core 9341 and the second switching core 9342 are respectively provided with a perforation corresponding to the first hole 9311 and the second hole 9312, and the hole switching core 934 is disposed in the cavity 9310 and is used for switching to the first hole 9311 or the second hole 9312 to be communicated with the cavity 9310. After the first switching core 9341 is installed in the injection cavity 9310, the second injection hole 9312 is blocked, so that the first injection hole 9311 is communicated with the injection cavity 9310, and at this time, the injection material injected by the injection molding machine enters the cavity from the first injection path; after the second switching core 9342 is installed in the injection cavity 9310, the first injection hole 9311 is blocked, so that the second injection hole 9312 is communicated with the injection cavity 9310, and at this time, the injection material injected from the injection machine enters the cavity through the second injection path. Thereby realizing the switching of the injection flow channel.

Further, in this embodiment, the injection head 93 further includes a cap 932, an injection hole 9320 is formed in the cap 932, and the cap 932 covers the injection cavity 9310; the first injection hole 9311 and the second injection hole 9312 are disposed at one end of the injection cavity 9310 away from the cap 932; the device further comprises a pressure spring 935 arranged in the injection cavity 9310, wherein the pressure spring 935 is pressed on the injection hole switching core 934 until the injection hole switching core 934 is tightly attached to one end of the injection cavity 9310 away from the cap 932. Tightness of fit between the injection hole switching core 934 and the end part of the injection cavity 9310 can be guaranteed, so that the injection material can flow out from the preset injection hole. In addition, in the process of switching the injection materials each time, the injection materials in the injection cavity 9310 need to be removed, the injection materials are difficult to directly take down because the injection materials are molded, the compression spring 935 is clamped in the injection cavity 9310 by using the heated clamp and pulled outwards, and the injection materials in the injection cavity 9310 can be taken out together because the compression spring 935 is buried in the injection materials, so that the injection hole switching core 934 can be conveniently replaced. Specifically, the cap 932 is screwed to the connector 931, and a tapered slot corresponding to the shape of the nozzle of the injection machine is provided at the outer side of the injection hole 9320.

Further, in this embodiment, the end of the injection cavity 9310 away from the cap 932 is tapered, and the injection hole switching core 934 is a housing that is adapted to the shape of the tapered end of the injection cavity 9310.

Further, in this embodiment, the inner ends of the first pouring inlet pipe 91 and the second pouring inlet pipe 92 are provided with a first cover body 911 and a second cover body 921 corresponding to the section of the installation cavity 90, and the first flow dividing cavity 910 and the second flow dividing cavity 920 correspond to the inner cavities of the first cover body 911 and the second cover body 921 respectively; the second cover 921 is disposed at an axially outer end of the first cover 911, and the second cover 921 is open near the end of the first cover 911.

The first and second shunt cavities 910 and 920 are isolated from each other by the first and second covers 911 and 921.

Further, in this embodiment, the first cover 911 includes an open housing 9111 disposed at an inner end of the mounting cavity 90 and an annular partition plate 9112 fixed at an outer side of an inner end of the first pouring inlet 91, where the open housing 9111, the annular partition plate 9112 and the second cover 921 are sequentially connected in an axial sealing manner to form a first flow splitting cavity 910 and a second flow splitting cavity 920, and through holes corresponding to the first pouring inlet 901 and the second pouring inlet 902 are respectively disposed on sidewalls of the first cover 911 and the second cover 921. The whole can be axially disassembled, so that the inner cavities of the first cover body 911 and the second cover body 921 can be cleaned conveniently. It should be noted that, in this structure, the injection head 93 and the first and second pouring pipes 91 and 92 are also detachably connected, so that, in order to improve the positioning accuracy and the sealing performance of the contact surface, the joint surfaces of the injection head 93 and the first and second pouring pipes 91 and 92 are tapered, and a sealing ring may be provided between the contact surfaces. Of course, the above-mentioned components of the axial sealing connection may also be welded together to ensure absolute tightness.

Example 6

As shown in fig. 4 to 6, when the injection runner structure of the secondary molding die of embodiment 5 is applied to the injection molding apparatus of embodiment 3, the installation cavity 90 corresponds to the cavity of the core member 41, and the first inlet 901 and the second inlet 902 penetrate the wall of the core member 41; the core tube 51 is provided with a runner hole 512 corresponding to the first inlet 901; when the core tube 51 moves to the first molding position, the runner hole 512 communicates with the first inlet 901 while the second inlet 902 is blocked by the core tube 51; when the core tube 51 is moved to the second molding position, the second inlet 902 communicates with the molding cavity 40.

When the injection molding is actually performed, the injection molding with higher hot melting temperature is performed firstly, that is, the core tube 51 is first injection molded in the first molding position, the injection molding with higher hot melting temperature is performed, at this time, the injection molding enters the molding cavity 40 from the first injection path, and the residual materials in the second injection path cannot enter the molding cavity 40 due to the second gate 902 being blocked. After the primary molding is completed, the core tube 51 is moved to the second molding position, and at this time, the temperature in the heat exchange cavity 903 is adapted to the secondarily injected injection material, and is lower than the hot melting temperature of the first injection material, and then the remainder in the first injection path cannot be melted into a liquid state, so that the first inlet 901 is naturally blocked, and the injection material enters the molding cavity 40 from the second inlet 902 when the secondary injection is performed. The whole process is to mold the second molded body 3 and then the first molded body 1. With the above arrangement, the injection can be switched from the first inlet 901 or the second inlet 902 to the molding cavity 40.

Further, in this embodiment, as shown in fig. 6, the fixed mold fixing assembly 7 includes a third mounting plate 71, the outer end of the core member 41 is connected with the inner side surface of the third mounting plate 71 by a screw, the outer side wall of the connecting head 931 is provided with a threaded section 931, the outer end of the threaded section 931 is provided with a limiting step 931, the connecting head 931 is connected with the third mounting plate 71 by a threaded section 931 in a threaded manner, the corresponding third mounting plate 71 is provided with an adaptive threaded hole, and the inner end surface of the limiting step 931 is attached to the end surface of the third mounting plate 71 far away from the core member 41. Based on the above structure, the core member 41 and the injection runner assembly 9 are integrally formed, and the third mounting plate 71 is clamped between the end surface of the core member 41 and the limiting step 9314, so that the connecting structure is stable, and the firm installation of the core member 41 and the fixed die fixing assembly 7 can be ensured. The sleeve 42 is mounted on a third mounting plate 71.

Example 7

An injection molding method of a composite flange, using an injection molding apparatus as described in example 3 to injection mold a two-shot composite flange as described in example 1, comprising the steps of;

step S1: resetting, moving the core tube 51 and the annular forming plate 52 to a first forming position in an initial state, and moving the movable mould fixing assembly 8 to open the core assembly;

Step S2: the core tube 51 is sleeved with a spring, and the core tube 51 is sleeved with a reinforcing spring 2;

step S3: closing the mold, wherein the movable mold fixing assembly 8 moves to the mold core assembly for closing;

step S4: injection molding is carried out on the molding cavity 40 for one time, and the second molding body 3 is formed by cooling; the second molded body 3 is then coated on the reinforcement spring 2.

Step S5: a change cavity, the first driving assembly 6 drives the core tube 51 and the annular forming plate 52 to move to a second forming position;

s6, a step of S6; injection molding the mold cavity 40, and cooling to form a two-shot molded composite flange as described in example 1;

step S7: and opening the die to a reset state, and taking out the formed part.

In a general injection molding method, injection molding of the first molded body 1 is finished firstly, then the die is opened, the reinforcing spring 2 is sleeved on the pipe body inner core 11, and then the die cavity is switched to finish injection molding of the second molded body 3, so that the efficiency is low. Based on the method, the insert reinforcing spring 2 is firstly placed in a die, and then injection molding and secondary injection molding are carried out, so that a finished product can be directly obtained, and the injection molding method has the advantage of high injection molding efficiency.

The technical principles of the present invention have been described above in connection with specific embodiments, which are provided for the purpose of explaining the principles of the present invention and are not to be construed as limiting the scope of the present invention in any way. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims (10)

1. A two shot composite flange comprising:

the pipe body comprises a first molding body (1), wherein the first molding body (1) comprises a pipe body inner core (11) and a connecting disc (12), the connecting disc (12) is arranged at one end of the pipe body inner core (11), and a mounting hole is formed in the connecting disc (12);

the reinforcing spring (2) is sleeved outside the inner core (11) of the pipe body,

the second molding body (3), the second molding body (3) comprises a pipe body sleeve (31), and the pipe body sleeve (31) is integrally coated on the outer sides of the reinforcing spring (2) and the pipe body inner core (11);

the first molded body (1) has a hardness greater than that of the second molded body (3).

2. The over-molded composite flange according to claim 1, wherein: the second molding body (3) radially extends outwards at one end of the pipe body sleeve (31) to form an annular connecting part (32), and the annular connecting part (32) is embedded on the end face of the connecting disc (12) near one side of the pipe body inner core (11).

3. The over-molded composite flange according to claim 2, wherein: a group of first convex parts (33) are radially and inwards extended from one end of the pipe body sleeve (31) far away from the annular connecting part (32), a group of first convex parts (33) are circumferentially arranged at intervals, a group of second convex parts (13) radially and outwards extended from one end of the pipe body inner core (11) far away from the connecting disc (12) are correspondingly arranged, and a group of second convex parts (13) are embedded at the interval positions of the group of first convex parts (33);

The reinforcing spring (2) is arranged between the second convex part (13) and the connecting disc (12).

4. The over-molded composite flange according to claim 2, wherein: the outer side surface of the annular connecting part (32) is provided with threads (321).

5. An injection molding device: a method for manufacturing a two shot molded composite flange according to claim 1, wherein: the mold core assembly is internally provided with a molding cavity (40) which is matched with an injection molding piece;

the core assembly comprises a fixed mold core assembly (4) and a core piece (41), wherein the core piece (41) is integrally cylindrical, and the outer side wall of the core piece (41) is used for forming the inner wall of the inner core (11) of the pipe body;

the movable model core assembly (5) comprises a core tube (51), wherein the core tube (51) is used for forming the inner wall of a tube body sleeve (31), and the core tube (51) is sleeved on the core piece (41); the movable model core assembly (5) further comprises an annular forming plate (52) sleeved outside the core tube (51), and the annular forming plate (52) is matched with one side of the tube body sleeve (31) close to the connecting disc (12);

the device further comprises a first driving assembly (6), wherein the first driving assembly (6) is in driving connection with the core pipe (51) and the annular forming plate (52), and the first driving assembly (6) is used for driving the core pipe (51) and the annular forming plate (52) to axially move to a first forming position and a second forming position so as to realize the switching of the integral shapes of the forming cavity (40) corresponding to the second forming body (3) and the first forming body (1);

Still include fixed subassembly (7) of cover half and movable mould fixed subassembly (8), cover half core subassembly (4) are installed on fixed subassembly (7) of cover half, movable mould core subassembly (5) and first drive assembly (6) are installed on fixed subassembly (8) of movable mould, fixed subassembly (8) of movable mould can horizontal migration in order to realize core subassembly switching.

6. An injection molding apparatus as claimed in claim 5, wherein: the fixed die core assembly (4) comprises a sleeve body core corresponding to the outer side wall of the forming part, and the sleeve body core comprises a sleeve (42) corresponding to the outer wall of the pipe body sleeve (31).

7. An injection molding apparatus as claimed in claim 5, wherein: the movable mold core assembly (5) comprises a molding plate (53) corresponding to the bottom of the molding connecting disc (12), a groove hole (531) which is matched with the shape of the annular molding plate (52) is formed in the molding plate (53), and when the annular molding plate (52) moves to a second molding position, the annular molding plate (52) is embedded in the groove hole (531).

8. An injection molding apparatus as claimed in claim 5, wherein: the movable die fixing assembly (8) comprises a first mounting plate (81) and a second mounting plate (82) which are arranged at intervals, the forming plate (53) is mounted on the first mounting plate (81), the first driving assembly (6) comprises a driving cylinder (61) mounted on the second mounting plate (82), and the driving cylinder (61) telescopic assembly is connected with the core tube (51).

9. An injection molding apparatus as claimed in claim 6, wherein: the first driving assembly (6) comprises a sliding frame (62), the sliding frame (62) comprises a sliding plate (621) and a group of first guide rods (622), the sliding plate (621) and the annular forming plate (52) are arranged at intervals, the group of first guide rods (622) are arranged on one side, far away from the forming cavity (40), of the annular forming plate (52), and the sliding plate (621) is arranged on the group of first guide rods (622);

a second guide rod (83) is arranged between the first mounting plate (81) and the second mounting plate (82), and the sliding plate (621) is arranged on the second guide rod (83) in a sliding manner;

the outer side wall of the core tube (51) is provided with a driving plate (511), the driving plate (511) is slidably arranged on a group of first guide rods (622), and the driving plate (511) is arranged between the sliding plate (621) and the annular forming plate (52);

the driving plate (511) is used for pushing the sliding plate (621) or the annular forming plate (52) along with the movement of the core tube (51) so that the annular forming plate (52) moves to the first forming position or the second forming position.

10. The injection molding method of the composite flange is characterized by comprising the following steps of: use of an injection molding apparatus according to claim 5, comprising the steps of;

Step S1: resetting, wherein the core tube (51) and the annular forming plate (52) move to a first forming position in an initial state, and the movable die fixing assembly (8) moves to an opening state of the core assembly;

step S2: a spring is sleeved, and a reinforcing spring (2) is sleeved on the core tube (51);

step S3: closing the mold, wherein the movable mold fixing assembly (8) moves to the mold core assembly for closing;

step S4: performing primary injection molding, performing injection molding on the molding cavity (40), and cooling to form a second molding body (3);

step S5: -a change cavity, the first drive assembly (6) driving the core tube (51) and annular forming plate (52) to a second forming position;

s6, a step of S6; carrying out secondary injection molding, namely carrying out injection molding on the molding cavity (40), and cooling to form the secondary injection molding composite flange as claimed in claim 1;

step S7: and opening the die to a reset state, and taking out the formed part.