CN110900966A - Multicolor injection mold of PP (polypropylene) box and injection molding process thereof - Google Patents
Multicolor injection mold of PP (polypropylene) box and injection molding process thereof Download PDFInfo
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- CN110900966A CN110900966A CN201911150795.3A CN201911150795A CN110900966A CN 110900966 A CN110900966 A CN 110900966A CN 201911150795 A CN201911150795 A CN 201911150795A CN 110900966 A CN110900966 A CN 110900966A
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- 239000007924 injection Substances 0.000 title claims abstract description 49
- 238000001746 injection moulding Methods 0.000 title claims abstract description 34
- 239000004743 Polypropylene Substances 0.000 title description 18
- -1 polypropylene Polymers 0.000 title description 2
- 229920001155 polypropylene Polymers 0.000 title description 2
- 239000003292 glue Substances 0.000 claims description 53
- 230000007246 mechanism Effects 0.000 claims description 53
- 238000001514 detection method Methods 0.000 claims description 14
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- 238000004519 manufacturing process Methods 0.000 description 10
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- 235000017166 Bambusa arundinacea Nutrition 0.000 description 5
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- 235000015334 Phyllostachys viridis Nutrition 0.000 description 5
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/03—Injection moulding apparatus
- B29C45/04—Injection moulding apparatus using movable moulds or mould halves
- B29C45/06—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/76083—Position
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76177—Location of measurement
- B29C2945/76254—Mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76551—Time
- B29C2945/76561—Time duration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76822—Phase or stage of control
- B29C2945/76862—Holding, dwelling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7162—Boxes, cartons, cases
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of molds, in particular to a multicolor injection mold of a PP box and an injection molding process thereof.
Description
Technical Field
The invention relates to the technical field of molds, in particular to a multicolor injection mold of a PP box and an injection molding process thereof.
Background
With the steep increase of automobile consumption in recent years, the appearance change is more frequent than before, the appearance requirement of corresponding injection molding parts is higher and higher, and the color superposition is more and more common. Under the requirement, new injection molding processes and technologies are developed and applied successively, and compared with the traditional rubber-coating mold technology, the advantages of the double-color and three-color injection molding technologies in the aspects of appearance quality, appearance combination stability and production efficiency of products are more prominent, so that the double-color and three-color injection molding technologies are more widely popularized and applied than the traditional technology. However, the existing three-color injection molding often needs demolding after the first color molding and then subsequent pouring, so that the method is more complicated, the production cost investment is large, the yield of parts is low, and the market competition advantage is not achieved.
Disclosure of Invention
One of the objectives of the present invention is to provide a multi-color injection mold for PP boxes with high production efficiency, which overcomes the disadvantages of the prior art.
The purpose of the invention is realized by the following technical scheme:
the mould comprises two identical first rear moulds and second rear moulds, two different first front moulds and second front moulds, the first rear moulds and the second rear moulds are arranged on the turntable in a central symmetry manner, the first front moulds are matched with the first rear moulds, the second front moulds are matched with the second rear moulds, the first front moulds and the second front moulds can be respectively and simultaneously separated from the first rear moulds and the second rear moulds, a first glue injection port is arranged at the top of the first front mould, at least two glue injection ports are arranged on the second front mould, and the two glue injection ports are respectively a second glue injection port and a third glue injection port which are arranged at the top and the side edge of the second front mould, the injection molding machine is provided with gates for pouring color glue corresponding to the first glue injection port, the second glue injection port and the third glue injection port respectively;
the locking mechanism comprises an installation block, a driving assembly and a limiting block, the installation block is fixed on the base, the limiting block and the driving assembly are respectively installed on the limiting block, the limiting block is connected with a transmission shaft of the driving assembly, the driving assembly can drive the limiting block to move in a telescopic mode towards the direction of the turntable, and the turntable is provided with a limiting clamping groove which can be clamped with the limiting block;
still including being used for detecting carousel turned angle's angle detection mechanism and with locking mechanism with the equal electric control mechanism who connects of angle detection mechanism, angle detection mechanism includes fixed connection the response piece of carousel with fix inductor on the base, the inductor is used for detecting the turned angle of response piece.
The device comprises a forming die and is characterized by further comprising an ejector rod mechanism, wherein the ejector rod mechanism comprises an ejector rod and an ejection assembly capable of driving the ejector rod to eject the forming die out of a die cavity, a push block matched with the forming die is arranged at the top of the ejector rod, and the push block is arc-shaped or long-strip-shaped.
Wherein, ejecting subassembly includes rolling disc and locating piece, the locating piece includes fixed plate and fixed connection the spacing section of thick bamboo of fixed plate bottom, the bottom of a spacing section of thick bamboo with the last sliding surface connection of rolling disc, spacing section of thick bamboo, rolling disc and the equal coaxial setting of fixed plate, just be equipped with on the fixed plate with the jack that the hole of a spacing section of thick bamboo is linked together, the middle part of rolling disc is equipped with the through-hole, the lateral wall of through-hole is equipped with the internal thread, the ejector pin periphery be equipped with internal thread threaded connection's external screw thread, the ejector pin warp the jack inserts in the hole of a spacing section of thick bamboo and with internal thread threaded connection.
The bottom of the push block is provided with a notch, the notch is provided with an elastic piece, one end of the elastic piece is elastically connected with the top of the ejector rod, and the other end of the elastic piece is elastically connected with the inner wall of the notch.
The bottom of the first front die is provided with a groove, and the top of the first rear die is provided with a lug which can be inserted into the groove.
The bottom of the second front die is provided with a groove, and the top of the second rear die is provided with a lug which can be inserted into the groove.
The second purpose of the present invention is to provide an injection molding process of a multi-color injection mold for a PP box with high production efficiency, which overcomes the shortcomings of the prior art.
The purpose of the invention is realized by the following technical scheme:
the injection molding process of the multicolor injection mold of the PP box comprises the following steps:
s1: installing a mould on an injection molding machine;
s2: the first front die and the second front die move downwards to be respectively matched with the first rear die and the second rear die;
s3: the injection molding machine leads the first color glue into the mold cavities of the first front mold and the first rear mold through the sprue to form a first color forming body;
s3-1: raising the temperature of the first color glue to 400 ℃;
s3-2: injecting the first color adhesive into the die cavities of the first front die and the first rear die, wherein the filling time is 3 seconds;
s3-3: maintaining the pressure, wherein the pressure between the first front die and the first rear die is 70MPa by using a press, the maintaining time is 4.3 seconds, and the pressure is gradually reduced to 0MPa after 4.18 seconds;
s4: the press controls the first front die and the second front die to move upwards simultaneously, the turntable rotates to enable the first rear die with the formed first color forming body to move to the position below the second front die, the first front die and the second front die move downwards simultaneously to enable the second front die and the first rear die to be matched correspondingly, and the first front die and the second rear die are matched correspondingly;
s4-1: after the turntable rotates in place, a driving motor connected with the turntable stops to stop the rotation of the turntable, and meanwhile, after an inductor fixed on the base detects that an induction sheet on the turntable rotates in place, the signal is sent to the control mechanism, and after the control mechanism receives the signal, the control mechanism controls a driving assembly in the locking mechanism to start and drives a limiting block to protrude towards the direction of the turntable, so that the limiting block is clamped with the limiting clamping groove to limit the rotation of the turntable;
s5: the injection molding machine simultaneously and respectively adopts different pouring channels to flow second color glue and third color glue into a space between the second front mold and the first rear mold through the pouring gate, and the first color forming body is used as a base plate to complete the fusion of the second color and the third color to form a three-color PP box;
s5-1: at the moment, controlling the mold temperature of the second front mold to 150 ℃;
s5-2: respectively raising the material temperature of the second color glue and the third color glue to 350 ℃;
s5-3: pouring the second color glue and the third color glue simultaneously, and respectively adopting different pouring channels to flow between the second front mold and the first rear mold, and gradually fusing, wherein the filling time is 2.13 seconds;
s5-4: maintaining the pressure, wherein the pressure between the second front die and the first rear die is 87MPa by using a press, the filling time is 6.0 seconds, and the pressure is gradually reduced to 0MPa after 3.8 seconds;
s6: the finished multicolored PP box is removed from the mold.
The invention has the beneficial effects that: the product quality is ensured through the multiple set procedures, the first color, the second color and the third color can be better fused, the overall fusion effect is better through various parameters of a three-color injection molding machine, such as the control of temperature and filling time, and the control pressure value of a press, the problems of color mixing, bright printing and bulging cannot occur, the waterproof and dustproof effects are better, and the produced mold is more attractive and durable; the turntable is arranged and rotates to drive the first rear die and the second rear die to rotate, so that the production speed is increased; the die has the advantages of simple structure, relatively low manufacturing precision and process requirements and low cost; the injection molding machine can be molded at one time, thereby greatly saving the injection molding production cost and having high injection molding qualification rate; the risk of unstable assembly quality (water leakage and appearance defects) of the subsequent process is avoided, and the quality of finished products is improved; be provided with driving motor, and angle detection mechanism and locking mechanism mutually support, prevent to rotate the back of targetting in place when the carousel, driving motor has inertia to drive the carousel and continues to rotate, make first back mould, second back mould and first front mould second front mould can not the compound die completely, angle detection mechanism's inductor detects after the angle that the response piece arrived (the carousel rotates the back of targetting in place promptly), the signal is started towards control mechanism to the inductor, control mechanism receives behind this signal, control locking mechanism's drive assembly drive stopper removes in the spacing draw-in groove of carousel, stopper and spacing draw-in groove joint, position fix the position of carousel.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic structural view of a multicolor injection mold of a PP box of the invention.
Fig. 2 is a schematic structural view of a first mold of the multi-color injection mold of the PP box of the present invention.
FIG. 3 is a schematic structural diagram of a pin ejecting mechanism of the multi-color injection mold of the PP box of the invention.
FIG. 4 is a schematic view of a connecting structure of a push rod mechanism and a push block of the multi-color injection mold of the PP box of the invention.
Fig. 1 to 4 include:
the die comprises a base 1, a turntable 2, a limiting clamping groove 21, a first die 3, a first front die 31, a first rear die 32, a second die 4, a second front die 41, a second rear die 42, a locking mechanism 5, an installation block 51, a limiting block 53, an angle detection mechanism 6, an induction sheet 61, an inductor 62, an ejector rod mechanism 7, an ejector rod 72, a push block 73, a rotating disc 74, a fixing plate 75, a limiting cylinder 76, a notch 77 and an elastic piece 78.
Detailed Description
The invention is further described with reference to the following examples.
The invention relates to a multi-color injection mold of a PP box, as shown in figure 1, comprising a base 1, wherein the base 1 is fixed on the ground, a turntable 2 is arranged on the base 1, the turntable 2 is connected with the center of the base 1 and rotates relative to the base 1, two molds, namely a first mold 3 and a second mold 4, are arranged on the turntable 2, the first mold 3 and the second mold 4 are arranged on the turntable 2 in a central symmetry manner, the first mold 3 comprises a first front mold 31 and a first rear mold 32 connected with the bottom of the first front mold 31, the second mold 4 comprises a second front mold 41 and a second rear mold 42 connected with the bottom of the second front mold 41, the first front mold 31 and the second front mold 41 have different structures, the second rear mold 42 and the second rear mold 42 have the same structure, the first rear mold 32 and the second rear mold 42 are both fixedly connected to the turntable 2, the first front mold 31 and the second front mold 41 can move up and down relative to the first rear mold 32 and the second rear mold 42, the top of the first front mold 31 is provided with a first glue injection port (not shown), the second front mold 41 is provided with at least two glue injection ports, in this embodiment, the number of the glue injection ports of the second front mold 41 is two, the two glue injection ports are respectively arranged at the top of the second front mold 41 and the side edge of the second front mold 41, the two glue injection ports are respectively a second glue injection port (not shown) and a third glue injection port (not shown), the injection molding machine (not shown) is respectively provided with a first gate corresponding to the first glue injection port, a second gate corresponding to the second glue injection port, and a third gate corresponding to the third glue injection port.
The injection molding process of the multicolor injection mold of the PP box with the structure comprises the following steps:
s1: installing a mould on an injection molding machine;
s2: the first front die 31 and the second front die 41 move downwards to be matched with the first rear die 32 and the second rear die 42 respectively;
s3: the injection molding machine leads the first color paste into the mold cavities of the first front mold 31 and the first rear mold 32 through the gates to form a first color forming body;
s3-1: raising the temperature of the first color glue to 400 ℃;
s3-2: injecting the first color paste into the cavities of the first front mold 31 and the first rear mold 32, wherein the filling time is 3 seconds;
s3-3: maintaining the pressure, wherein the pressure between the first front die 31 and the first rear die 32 is 70MPa by using the press, the maintaining time is 4.3 seconds, and the pressure is gradually reduced to 0MPa after 4.18 seconds;
s4: the press controls the first front die 31 and the second front die 41 to move upwards simultaneously, the turntable 2 rotates, so that the first rear die 32 with the formed first color forming body moves to the position below the second front die 41, the first front die 31 and the second front die 41 move downwards simultaneously, so that the second front die 41 and the first rear die 32 are correspondingly matched, and the first front die 31 and the second rear die 42 are correspondingly matched;
s5: the injection molding machine simultaneously and respectively adopts different pouring channels to flow the second color glue and the third color glue between the second front mold 41 and the first rear mold 32 through the pouring gates, and the first color forming body is used as a base plate to complete the fusion of the second color and the third color to form a three-color PP box;
s5-1: at this time, the mold temperature of the second front mold 41 is controlled to 150 degrees celsius;
s5-2: respectively raising the material temperature of the second color glue and the third color glue to 350 ℃;
s5-3: pouring the second color glue and the third color glue simultaneously, and respectively adopting different pouring channels to flow between the second front mold 41 and the first rear mold 32, and gradually fusing, wherein the filling time is 2.13 seconds;
s5-4: maintaining the pressure, wherein the pressure between the second front die 41 and the first rear die 32 is 87MPa by the press, the filling time is 6.0 seconds, and the pressure is gradually reduced to 0MPa after 3.8 seconds;
s6: the finished multicolored PP box is removed from the mold.
In the embodiment, the product quality is ensured through a plurality of set processes, the first color, the second color and the third color can be better fused, the overall fusion effect is better through various parameters of a three-color injection molding machine, such as the control of temperature and filling time, and the control of a press machine on pressure values, the problems of color mixing, bright printing and bulging cannot occur, the waterproof and dustproof effects are better, and the produced mold is more attractive and durable; the turntable 2 is arranged, and the turntable 2 rotates to drive the first rear die 32 and the second rear die 42 to rotate, so that the production speed is increased; the die has the advantages of simple structure, relatively low manufacturing precision and process requirements and low cost; the injection molding machine can be molded at one time, thereby greatly saving the injection molding production cost and having high injection molding qualification rate; the risk of unstable assembly quality (water leakage and appearance defects) of the subsequent process is avoided, and the quality of finished products is improved.
As shown in fig. 2-4, injection mold still includes locking mechanism 5, angle detection mechanism 6 and control mechanism (not shown in the figure), control mechanism is connected with locking mechanism 5 and angle detection mechanism 6 electricity all, this locking mechanism 5 is including installation piece 51, drive assembly and stopper 53, installation piece 51 is fixed on base 1, stopper 53 and drive assembly install respectively on installation piece 51, stopper 53 is connected with drive assembly's transmission shaft and drive assembly can drive stopper 53 and carry out concertina movement towards the direction of carousel 2, carousel 2 is equipped with the spacing draw-in groove 21 that can with stopper 53 joint. The angle detection mechanism 6 comprises a sensing piece 61 fixedly connected with the turntable 2 and a sensor 62 fixed on the base 1, the sensor 62 is used for detecting the rotation angle of the sensing piece 61, the sensor 62 can send the detected signal of the rotation angle of the sensing piece 61 (namely the rotation angle of the turntable 2) to the control mechanism, and the control mechanism controls the positioning of the turntable 2. The bottom of the rotary table 2 is connected with a driving motor which rotates and drives the rotary table 2 to rotate. In this embodiment, be provided with driving motor (not shown), and angle detection mechanism 6 and locking mechanism 5 mutually support, prevent to rotate when carousel 2 and target in place the back, driving motor has inertia to drive carousel 2 and continue to rotate, make first back mould 32, second back mould 42 and first front mould 31 second front mould 41 can not complete the compound die, after inductor 62 of angle detection mechanism 6 detected the angle that response piece 61 rotated (namely carousel 2 rotated the back of target in place), inductor 62 started the signal towards control mechanism, after control mechanism received this signal, control locking mechanism 5's drive assembly drive stopper 53 removed towards the spacing draw-in groove 21 of carousel 2, stopper 53 and spacing draw-in groove 21 joint, with the position location of carousel 2.
The bottom of the first front mold 31 is provided with a groove (not shown), the top of the first rear mold 32 is provided with a lug (not shown) which can be inserted into the groove, the bottom of the second front mold 41 is provided with a groove, the top of the second rear mold 42 is provided with a lug which can be inserted into the groove, and by utilizing the clamping of the lug and the groove, the positions of the matched molds between the first front mold 31 and the first rear mold 32 as well as between the second front mold 41 and the second rear mold 42 can be further limited, so that the front mold and the rear mold are prevented from being dislocated in the matched mold process, and the color cement is prevented from flowing out.
Injection mold still includes ejector pin mechanism 7, ejector pin mechanism 7 includes ejector pin 72 and can drive ejector pin 72 with the ejecting subassembly of the ejecting die cavity of forming die, the top of ejector pin 72 be equipped with forming die complex ejector pad 73, the shape of ejector pad 73 is arc or rectangular shape, the shape of the ejecting face of laminating forming die, make the binding face grow between ejector pad 73 and the forming die, make the area of contact grow, when taking out the mould, forming die's atress is more even, break away from forming die from the mould more easily. The number of the push blocks 73 is multiple, the push blocks 37 are distributed around the forming die, the arc-shaped push blocks 73 are located on the bending edges of the forming die, and the strip-shaped push blocks are located on the straight edges of the forming die.
The ejection assembly comprises a rotating disc 74 and a positioning block, the positioning block comprises a fixing plate 75 and a limiting cylinder 76 fixedly connected with the bottom of the fixing plate 75, the bottom of the limiting cylinder 76 is in sliding connection with the upper surface of the rotating disc 74, the limiting cylinder 76, the rotating disc 74 and the fixing plate 75 are coaxially arranged, a jack communicated with an inner hole of the limiting cylinder 76 is formed in the fixing plate 75, a through hole is formed in the middle of the rotating disc 74, an inner thread is formed in the side wall of the through hole, an outer thread connected with the inner thread is formed in the periphery of the ejector rod 72, and the ejector rod 72 is inserted into the inner hole of the limiting cylinder 76 through. When the mold is molded and needs to be demolded, the rotating disc 74 is rotated at the moment, the limiting cylinder 76 is provided with the annular slide rail, the top of the rotating disc 74 is in sliding connection with the limiting cylinder 76, the rotating disc 74 rotates on the limiting cylinder 76, and the top end of the limiting cylinder 76 is fixedly connected with the fixing plate 75, so that when the rotating disc 74 rotates, the internal thread of the rotating disc 74 is in threaded connection with the external thread of the ejector rod 72, the ejector rod 72 can be driven to ascend, the limiting cylinder 76 and the fixing plate 75 are arranged, and the ejector rod 72 cannot deviate when ascending.
The bottom of the push block 73 is provided with a notch 77, the notch 77 is provided with an elastic member 78, one end of the elastic member 78 is elastically connected with the top of the push rod 72, and the other end of the elastic member 78 is elastically connected with the inner wall of the notch 77. When the turntable 2 rotates the ejector rod 72 until the top of the ejector rod 72 pushes the elastic part 78 to compress and abut against the inner wall, at this time, the elastic part 78 can play a role in buffering the ejector rod 72, so that the ejector rod 72 cannot be damaged, the ejector rod 72 rises to push the push block 73 upwards and contact with a forming mold, thereby driving the forming mold to rise until the forming mold is pushed out of a mold cavity, then the turntable 74 is reversed, so that the ejector rod 72 descends, demolding is completed, and the problem that the ejector rod 72 is rigidly abutted against the push block 73 and can damage the ejector rod 72 is solved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. The utility model provides a polychrome injection mold of PP case which characterized in that: the injection molding machine comprises a base, a rotary table capable of rotating on the base, a mold installed on the rotary table, a locking mechanism used for positioning the rotary table and a press used for providing pressure for the mold, wherein the mold comprises two identical first rear molds, two identical second rear molds, two different first front molds and two different second front molds, the first rear molds and the second rear molds are symmetrically arranged on the rotary table in the center, the first front molds are matched with the first rear molds, the second front molds are matched with the second rear molds, the first front molds and the second front molds can be respectively and simultaneously separated from the first rear molds and the second rear molds, a first glue injection port is formed in the top of the first front molds, at least two glue injection ports are formed in the second front molds, the two glue injection ports are respectively a second glue injection port and a third glue injection port which are formed in the top and the side of the second front molds, and the injection molding machine respectively corresponds to the first glue injection port, the second glue injection port and the third glue port, The second glue injection port and the third glue injection port are provided with gates for pouring color glue;
the locking mechanism comprises an installation block, a driving assembly and a limiting block, the installation block is fixed on the base, the limiting block and the driving assembly are respectively installed on the limiting block, the limiting block is connected with a transmission shaft of the driving assembly, the driving assembly can drive the limiting block to move in a telescopic mode towards the direction of the turntable, and the turntable is provided with a limiting clamping groove which can be clamped with the limiting block;
still including being used for detecting carousel turned angle's angle detection mechanism and with locking mechanism with the equal electric control mechanism who connects of angle detection mechanism, angle detection mechanism includes fixed connection the response piece of carousel with fix inductor on the base, the inductor is used for detecting the turned angle of response piece.
2. A multicolour injection mould for PP boxes according to claim 1, characterized in that: the ejection mechanism comprises an ejection rod and an ejection assembly capable of driving the ejection rod to eject the forming die out of the die cavity, the top of the ejection rod is provided with a push block matched with the forming die, and the push block is arc-shaped or long-strip-shaped.
3. A multicolour injection mould for PP boxes according to claim 2, characterized in that: the ejecting assembly comprises a rotating disc and a positioning block, the positioning block comprises a fixing plate and a fixed connection limiting cylinder arranged at the bottom of the fixing plate, the bottom of the limiting cylinder is connected with the upper surface of the rotating disc in a sliding mode, the limiting cylinder, the rotating disc and the fixing plate are all coaxially arranged, a jack communicated with an inner hole of the limiting cylinder is formed in the fixing plate, a through hole is formed in the middle of the rotating disc, an inner thread is formed in the side wall of the through hole, an outer thread connected with the inner thread is formed in the periphery of the ejector rod, and the ejector rod is inserted into the inner hole of the limiting cylinder and connected with the inner thread through the jack.
4. A multicolour injection mould for PP boxes according to claim 2, characterized in that: the bottom of the push block is provided with a notch, the notch is provided with an elastic piece, one end of the elastic piece is elastically connected with the top of the ejector rod, and the other end of the elastic piece is elastically connected with the inner wall of the notch.
5. A multicolour injection mould for PP boxes according to claim 1, characterized in that: the bottom of the first front die is provided with a groove, and the top of the first rear die is provided with a lug which can be inserted into the groove.
6. A multicolour injection mould for PP boxes according to claim 1, characterized in that: the bottom of the second front die is provided with a groove, and the top of the second rear die is provided with a lug which can be inserted into the groove.
7. An injection molding process using the multi-color injection mold of the PP box according to claim 1, wherein: the method comprises the following steps:
s1: installing a mould on an injection molding machine;
s2: the first front die and the second front die move downwards to be respectively matched with the first rear die and the second rear die;
s3: the injection molding machine leads the first color glue into the mold cavities of the first front mold and the first rear mold through the sprue to form a first color forming body;
s3-1: raising the temperature of the first color glue to 400 ℃;
s3-2: injecting the first color adhesive into the die cavities of the first front die and the first rear die, wherein the filling time is 3 seconds;
s3-3: maintaining the pressure, wherein the pressure between the first front die and the first rear die is 70MPa by using a press, the maintaining time is 4.3 seconds, and the pressure is gradually reduced to 0MPa after 4.18 seconds;
s4: the press controls the first front die and the second front die to move upwards simultaneously, the turntable rotates to enable the first rear die with the formed first color forming body to move to the position below the second front die, the first front die and the second front die move downwards simultaneously to enable the second front die and the first rear die to be matched correspondingly, and the first front die and the second rear die are matched correspondingly;
s4-1: after the turntable rotates in place, a driving motor connected with the turntable stops to stop the rotation of the turntable, and meanwhile, after an inductor fixed on the base detects that an induction sheet on the turntable rotates in place, the signal is sent to the control mechanism, and after the control mechanism receives the signal, the control mechanism controls a driving assembly in the locking mechanism to start and drives a limiting block to protrude towards the direction of the turntable, so that the limiting block is clamped with the limiting clamping groove to limit the rotation of the turntable;
s5: the injection molding machine simultaneously and respectively adopts different pouring channels to flow second color glue and third color glue into a space between the second front mold and the first rear mold through the pouring gate, and the first color forming body is used as a base plate to complete the fusion of the second color and the third color to form a three-color PP box;
s5-1: at the moment, controlling the mold temperature of the second front mold to 150 ℃;
s5-2: respectively raising the material temperature of the second color glue and the third color glue to 350 ℃;
s5-3: pouring the second color glue and the third color glue simultaneously, and respectively adopting different pouring channels to flow between the second front mold and the first rear mold, and gradually fusing, wherein the filling time is 2.13 seconds;
s5-4: maintaining the pressure, wherein the pressure between the second front die and the first rear die is 87MPa by using a press, the filling time is 6.0 seconds, and the pressure is gradually reduced to 0MPa after 3.8 seconds;
s6: the finished multicolored PP box is removed from the mold.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911150795.3A CN110900966A (en) | 2019-11-21 | 2019-11-21 | Multicolor injection mold of PP (polypropylene) box and injection molding process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911150795.3A CN110900966A (en) | 2019-11-21 | 2019-11-21 | Multicolor injection mold of PP (polypropylene) box and injection molding process thereof |
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| CN112157866A (en) * | 2020-09-18 | 2021-01-01 | 东莞捷盈精密硅胶科技有限公司 | Production device and process for directly discharging multi-cavity silica gel |
| CN115107220A (en) * | 2022-07-19 | 2022-09-27 | 东莞市谷麦光学科技有限公司 | Double-color injection mold |
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| CN104742341A (en) * | 2014-12-31 | 2015-07-01 | 东华机械有限公司 | Servo-power four-station rotary plate mechanism |
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