CN116080006A - High-precision injection mold and injection molding method for automobile plastic parts - Google Patents
High-precision injection mold and injection molding method for automobile plastic parts Download PDFInfo
- Publication number
- CN116080006A CN116080006A CN202310204838.1A CN202310204838A CN116080006A CN 116080006 A CN116080006 A CN 116080006A CN 202310204838 A CN202310204838 A CN 202310204838A CN 116080006 A CN116080006 A CN 116080006A
- Authority
- CN
- China
- Prior art keywords
- control
- plate
- mold
- transmission shaft
- die
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- B29C45/2602—Mould construction elements
-
- 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
-
- 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
- B29C45/34—Moulds having venting means
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a high-precision injection mold and an injection molding method for an automobile plastic accessory, wherein the high-precision injection mold comprises a female mold and a male mold, the female mold and the male mold are matched with each other, an installation space is formed in one side, far away from the female mold, of the male mold, an installation plate is arranged on one side of the installation space, the installation plate is fixedly connected with the male mold, a plurality of pressure relief holes are formed in the installation plate, when a control valve is completely closed, an outer ring and a sealing plate of a sealing cover separate an exhaust pipe from the pressure relief holes, namely a mold cavity is separated from the external space, a coil spring is in a winding state, the sealing plate has a continuous closing trend, the mold cavity pressure is sufficient, a dent is not generated on the surface of the plastic accessory, and a sink mark phenomenon is not generated; the control valves are linked, so that the air in the mold cavity is reasonably discharged during injection molding, the phenomenon of air trapping is avoided, and the surface of the plastic fitting is well copied and attractive in appearance.
Description
Technical Field
The invention belongs to the technical field of injection molds, and particularly relates to a high-precision injection mold and an injection molding method for automobile plastic parts.
Background
The plastic part is used in the automobile, so that fuel oil can be saved to a certain extent, and the environment protection and the recycling of resources are promoted. In general, plastic parts in automobiles are injection molded, and various defects often occur in the process, so that the production quality of automobiles is affected. Therefore, it is highly desirable to enhance the analysis of defects in automotive injection molded parts and to provide efficient handling.
The phenomena of poor surface replication, weld marks and sink marks of the plastic parts are common and are not easy to solve;
poor surface replication refers to the inability to accurately replicate the surface of a mold cavity, particularly as uneven surface gloss of the part, during the molding of an injection molded part. In general, the surface of an automobile injection molding part has various patterns, and the degree of fineness of the patterns determines the copying difficulty of injection molding, and the finer the patterns, the harder the copying. In addition, if the shapes of the dermatoglyph are very regular and are not communicated with each other, poor replication of the surface of the injection molding part is easily caused by air trapping of the dermatoglyph. Two reasons for this are that the cavity pressure is insufficient and that the air is trapped.
Weld marks are stripes that are produced by dividing the molten plastic into two or more flows and then converging the flows, and at this time, the leading end portions of the flowing resin are cooled and oxidized, and thus it is difficult to completely fuse the molten plastic. The main reason is that the plastic in the molten state cannot be controlled to flow along a desired path.
Sink mark refers to the condition that the surface of an injection molding product is recessed. The main reason is that the holding pressure is insufficient.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a high-precision injection mold and an injection molding method for automobile plastic parts.
The technical scheme adopted by the invention is as follows:
the utility model provides a high accuracy injection mold of car plastic accessory, includes master model and public mould, the master model with public mould is mutually supported, public mould is kept away from one side of master model is equipped with the installation space, one side of installation space is equipped with the mounting panel, the mounting panel with public mould fixed connection, be equipped with a plurality of pressure release holes on the mounting panel, be equipped with a plurality of blast pipes in the installation space, a plurality of blast pipes with a plurality of pressure release holes one-to-one, the one end of blast pipe with mounting panel fixed connection, the blast pipe keep away from the one end of mounting panel with public mould is connected, the one end of blast pipe runs through public mould, the one end of blast pipe keep away from public mould with pressure release hole connection; and each exhaust pipe is internally provided with a control valve, the control valve is driven by a control motor, and the control motor is detachably arranged on the mounting plate.
Preferably, the control valve comprises a plurality of control plates, wherein each control plate comprises a sealing plate and a side plate, the sealing plates of the plurality of control plates are encircled to form a circle, the side plates of the plurality of control plates are encircled to form a cylinder, one side, far away from the sealing plates, of each control plate is fixedly provided with a connecting rod, one side, far away from the connecting rod, is provided with a sealing cover, the connecting rod is in sliding connection with the sealing cover, and the sealing cover is fixedly arranged at one end, close to the mounting plate, of the exhaust pipe.
As the preferable mode of the invention, a limit disc is fixedly arranged on one side, close to the control panel sealing plate, of the seal cover, a plurality of sliding grooves are formed in the periphery of the limit disc, the sliding grooves are uniformly distributed along the periphery of the limit disc, the sliding grooves correspond to the control panels one by one, and each connecting rod is arranged in one sliding groove in a sliding way.
As the preferable mode of the invention, one side of the mounting plate far away from the mounting space is fixedly provided with a screen plate, and the control motor is fixedly arranged on the screen plate; the screen plate and the mounting plate form a working space, a transmission shaft is rotatably arranged on the inner wall of one side of the working space, which is close to the screen plate, the transmission shaft penetrates through the screen plate, and the transmission shaft is fixedly connected with an output shaft of the control motor.
As the preferable mode of the invention, one side of the transmission shaft, which is close to the control panel, is detachably provided with a control shaft, the control shaft is rotationally connected with the sealing cover, the control shaft penetrates through the sealing cover and the limiting disc, one side of the control shaft, which is close to the control panel, is fixedly provided with a control disc, a plurality of arc-shaped grooves are fixedly arranged on the control disc, the arc-shaped grooves correspond to the control panels one by one, a control pin is slidably arranged in each arc-shaped groove, and each control pin is fixedly arranged on one connecting rod.
Preferably, each transmission shaft is fixedly provided with a small belt pulley and a large belt pulley, the small belt pulleys and the large belt pulleys on two adjacent transmission shafts are distributed in a staggered mode, and the small belt pulley on one transmission shaft and the large belt pulley on the other transmission shaft adjacent to the small belt pulley are driven by a synchronous belt.
As the preferable mode of the invention, one end, close to the inside of the control shaft, of the transmission shaft is provided with a placement cavity, a coil spring is arranged in the placement cavity, the outer side of the coil spring is fixedly connected with the side wall of the placement cavity, the inner side of the coil spring is fixedly arranged on the peripheral side of the control shaft, and the control shaft is rotationally connected with the sealing cover.
As the preferable mode of the invention, the two control motors are respectively arranged at two sides of the screen plate, each control motor respectively drives one row of control valves, the two rows of control valves and the two control motors are rotationally symmetrical along the center of the cross section of the screen plate, and the two rows of control valves are mutually parallel; one side of one of the control motors is provided with an injection molding opening penetrating through the male die.
As the preferable mode of the invention, a bottom plate is fixedly arranged on one side of the female die, which is far away from the male die, an ejection cylinder is arranged on one side of the bottom plate, which is close to the male die, a cylinder barrel of the ejection cylinder is fixedly connected with the bottom plate, an ejection plate is fixedly arranged on a piston rod of the ejection cylinder, an ejection block is fixedly arranged on one side of the ejection plate, which is far away from the bottom plate, the ejection block penetrates through the female die, and the ejection block is in sliding connection with the female die; the female die is fixedly provided with a positioning column, and the male die is provided with a positioning hole matched with the positioning column.
A high-precision injection molding method of automobile plastic parts comprises the following steps:
s1, preparing liquid; adding raw materials into a hopper of an injection machine, and heating and melting the raw materials to form a flowing state;
s2, injection; the screw rod of the injection machine is utilized to control the piston of the injection machine to push, and the piston enters the die cavity through the nozzle and the injection port;
s3, shaping; setting the raw materials in a flowing state in a mold cavity, controlling a motor to start in the process, controlling a plurality of exhaust pipes to be gradually closed, and guiding the raw materials to flow in a flow path of the mold cavity;
s4, cooling; starting a cooling water pump to enable the raw materials to be rapidly hardened in the die cavity;
s5, demolding; after the mold is separated, the ejection cylinder is started to eject the plastic product.
The beneficial effects of the invention are as follows: the invention is used as a high-precision injection mold and an injection molding method for automobile plastic parts, and solves the problems of poor surface replication, weld marks and sink marks existing in the traditional injection molding process aiming at the high-precision requirement of the automobile plastic parts; when the control valve is completely closed, the outer ring of the sealing cover and the sealing plate separate the exhaust pipe from the pressure relief hole, namely the die cavity is separated from the external space, and the coil spring is in a winding state, so that the sealing plate has a continuous closing trend, the die cavity pressure is ensured to be sufficient, the surface of the plastic fitting is not depressed, namely the sink mark phenomenon is not generated; the control valves are linked, so that the air in the mold cavity is reasonably discharged during injection molding, the phenomenon of air trapping is avoided, the surface of the plastic fitting is well copied, and the appearance is exquisite; the control valves guide the flow paths of the plastic liquid at the same time under the change of the pressure in the die cavity, so that the phenomenon of weld marks generated by random flow, backflow and convection of the plastic liquid can not be caused.
Drawings
The invention will be described in further detail with reference to the accompanying drawings and detailed description.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic side elevational view of the FIG. 1 structure of the present invention;
FIG. 3 is a schematic view of the A-A direction structure of FIG. 2 according to the present invention;
FIG. 4 is a schematic elevational view of the present invention of FIG. 1;
FIG. 5 is a schematic view of the B-B direction structure of FIG. 4 according to the present invention;
FIG. 6 is an enlarged schematic view of the structure of FIG. 5 at D in accordance with the present invention;
FIG. 7 is a schematic view of the C-C direction structure of FIG. 4 according to the present invention;
FIG. 8 is a schematic view of the control valve and drive shaft of FIG. 5 according to the present invention;
FIG. 9 is a schematic view of the present invention with portions of the parts of FIG. 8 hidden;
FIG. 10 is a schematic elevational view of the present invention of FIG. 8;
FIG. 11 is a schematic view of the E-E direction structure of FIG. 10 according to the present invention;
FIG. 12 is a schematic view of the F-F direction structure of FIG. 10 in accordance with the present invention;
fig. 13 is a schematic view of the seal cap of fig. 8 according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
The following describes a specific embodiment of the present invention with reference to fig. 1-13, a high-precision injection mold for an automobile plastic part, including a female mold 11 and a male mold 12, where the female mold 11 and the male mold 12 are matched with each other, a mold core and other parts of the mold must be provided in the female mold 11 and the male mold 12, a mounting space 20 is provided on a side of the male mold 12 away from the female mold 11, a mounting plate 23 is provided on a side of the mounting space 20, the mounting plate 23 is fixedly connected with the male mold 12, a plurality of pressure relief holes 24 are provided on the mounting plate 23, a plurality of exhaust pipes 21 are provided in the mounting space 20, the exhaust pipes 21 may be made of soft materials, the number and distribution of the exhaust pipes 21 are affected by the actual situation of the mold, and are generally arranged in a straight line along the length direction of the mold, a plurality of the exhaust pipes 21 are in one-to-one correspondence with the plurality of pressure relief holes 24, one end of the exhaust pipes 21 is fixedly connected with the mounting plate 23, one end of the exhaust pipes 21 away from the mounting plate 23 is connected with the male mold 12, one end of the exhaust pipes 21 penetrates through the male mold 12, and one end of the exhaust pipes 21 is away from the pressure relief holes 24; a control valve is arranged in each exhaust pipe 21, the control valve is driven by a control motor 14, and the control motor 14 is detachably arranged on the mounting plate 23; the control valve can control not only the opening and closing of the exhaust pipe 21, but also the size of the section of the exhaust pipe 21, and because the exhaust pipe 21 is long and narrow, the pressure balance of the spaces at two sides of the exhaust pipe needs a long time, the section of the exhaust pipe 21 is flexibly controlled in the process, and the purpose of changing the pressure at a certain part in the die cavity can be achieved, so that the flow path of plastic liquid is guided during injection, and the generation of weld marks is avoided.
Advantageously, the control valve comprises a plurality of control plates 31, the control plates 31 comprise sealing plates and side plates, the sealing plates of the control plates 31 are encircled to form a circle, the side plates of the control plates 31 are encircled to form a cylinder, one side, far away from the sealing plates, of each control plate 31 is fixedly provided with a connecting rod 37, one side, far away from the connecting rod 37, is provided with a sealing cover 25, the connecting rod 37 is in sliding connection with the sealing cover 25, and the sealing cover 25 is fixedly arranged at one end, close to the mounting plate 23, of the exhaust pipe 21. The sealing cover 25 and the sealing plate have good air tightness when being closed, so that the sufficient pressure for maintaining the shape is ensured, and no sink mark is generated.
Advantageously, a limiting disc 38 is fixedly arranged on one side of the sealing cover 25, close to the sealing plate of the control plate 31, a plurality of sliding grooves 39 are formed in the periphery of the limiting disc 38, the sliding grooves 39 are uniformly distributed along the periphery of the limiting disc 38, the sliding grooves 39 and the control plate 31 are in one-to-one correspondence, and each connecting rod 37 is slidably arranged in one sliding groove 39. The limiting plate 38 limits the moving direction of the control plate 31, the moving direction of the control plate is fixed, and the opening and closing conditions of the corresponding sealing plates can be controlled by controlling the moving distance of the control plate, so that the purpose of controlling the section of the exhaust pipe 21 is achieved.
Advantageously, the side of the mounting plate 23 far from the mounting space 20 is fixedly provided with a screen 13, and the control motor 14 is fixedly arranged on the screen 13; the screen plate 13 and the mounting plate 23 form a working space 22 therebetween, a transmission shaft 27 is rotatably arranged on the inner wall of one side of the working space 22, which is close to the screen plate 13, the transmission shaft 27 penetrates through the screen plate 13, and the transmission shaft 27 is fixedly connected with an output shaft of the control motor 14. The side of the screen 13 is a fine screen structure, the inner side and the outer side of the screen 13 are communicated, and during injection molding, gas in the mold cavity can be discharged to the outside through the screen 13 by the exhaust pipe 21.
Advantageously, a control shaft 30 is detachably mounted on one side of the transmission shaft 27, which is close to the control board 31, the control shaft 30 is rotatably connected with the sealing cover 25, the control shaft 30 penetrates through the sealing cover 25 and the limiting disc 38, a control disc 32 is fixedly arranged on one side of the control shaft 30, which is close to the control board 31, a plurality of arc grooves 35 are fixedly arranged on the control disc 32, the arc grooves 35 are in one-to-one correspondence with the control board 31, a control pin 36 is slidably arranged in each arc groove 35, and each control pin 36 is fixedly arranged on one connecting rod 37. The distance between the two ends of the arc-shaped groove 35 and the center of the control panel 32 is different, the control pin 36 is influenced by the connecting rod 37 to only move the control panel 31 in the radial direction synchronously, and when the control panel 32 rotates, the control pin 36 slides in the arc-shaped groove 35 to drive the control panel to open and close.
Advantageously, each transmission shaft 27 is fixedly provided with a small belt pulley 28 and a large belt pulley 26, the small belt pulleys 28 and the large belt pulleys 26 on two adjacent transmission shafts 27 are distributed in a staggered manner, and the small belt pulley 28 on one transmission shaft 27 and the large belt pulley 26 on the other transmission shaft 27 adjacent to the small belt pulley 28 are driven by a synchronous belt 34. Each transmission shaft 27 is provided with a small belt wheel 28 and a large belt wheel 26, only one belt wheel is connected with a synchronous belt 34, and the transmission shafts can synchronously rotate through the small belt wheel and the synchronous belt 34 in a speed reducing manner, but the rotating angular speed is gradually decreased, so that the opening and closing conditions of a plurality of control valves are controlled to be gradually opened or closed.
Advantageously, one end of the transmission shaft 27, which is close to the inside of the control shaft 30, is provided with a positioning cavity, a coil spring 29 is provided in the positioning cavity, the outside of the coil spring 29 is fixedly connected with the side wall of the positioning cavity, the inside of the coil spring 29 is fixedly provided on the circumferential side of the control shaft 30, and the control shaft 30 is rotatably connected with the sealing cover 25. The coil spring 29 allows the transmission shaft 27 and the control shaft 30 to rotate relatively, but when the coil spring 29 is in a normal state when the control shaft 30 does not have a movement limit position (the control valve is fully opened or fully closed), the rotation shaft 27 preferentially rotates the control shaft 30.
Advantageously, two control motors 14 are respectively disposed at two sides of the screen 13, each control motor 14 drives a row of control valves, the two rows of control valves and the two control motors 14 are rotationally symmetrical along the center of the cross section of the screen 13, and the two rows of control valves are mutually parallel; one side of one of the control motors 14 is provided with an injection port 33 penetrating the male die 12. In general, two rows of control valves only need to work in one row, and under the conventional condition, the die cavities are relatively uniform, and the cross-sectional areas of the two ends in the length direction of the die cavities are not greatly different, so that in general, when injection molding is performed, a small amount of exhaust pipes 21 near one end of the injection molding port 33 are controlled, and a large amount of exhaust pipes 21 far one end of the injection molding port 33 are controlled to exhaust, so that the plastic liquid can quickly flow to one end of the far injection molding port 33; however, in special cases, the space at the end of the far injection port 33 is small, the space at the end of the near injection port is large, and the control valve is used to control the exhaust pipe 21 in the opposite way, so that the problem can be solved just by using another row of control valves.
The female die 11 is fixedly provided with a bottom plate 18 at one side far away from the male die 12, an ejection cylinder 17 is arranged at one side, close to the male die 12, of the bottom plate 18, a cylinder barrel of the ejection cylinder 17 is fixedly connected with the bottom plate 18, an ejection plate 19 is fixedly arranged on a piston rod of the ejection cylinder 17, an ejection block 16 is fixedly arranged at one side, far away from the bottom plate 18, of the ejection plate 19, the ejection block 16 penetrates through the female die 11, and the ejection block 16 is in sliding connection with the female die 11; the female die 11 is fixedly provided with a positioning column 15, and the male die 12 is provided with a positioning hole matched with the positioning column 15.
A high-precision injection molding method of automobile plastic parts comprises the following steps:
s1, preparing liquid; adding raw materials into a hopper of an injection machine, and heating and melting the raw materials to form a flowing state;
s2, injection; the screw rod of the injection machine is utilized to control the piston of the injection machine to push, and the piston enters the die cavity through the nozzle and the injection port 33;
s3, shaping; the raw materials in the flowing state are shaped in the die cavity, in the process, the motor 14 is controlled to be started, the exhaust pipes 21 are controlled to be gradually closed, and the flowing paths of the raw materials in the die cavity are guided;
s4, cooling; starting a cooling water pump to enable the raw materials to be rapidly hardened in the die cavity;
s5, demolding; after the mold is separated, the ejection cylinder 17 is started to eject the plastic product.
The working principle of the invention is as follows:
the female die 11 and the male die 12 of the invention are also internally provided with a die core, a material overflow groove, a cooling plate and the like (not shown), and the specific shape of the die core can be customized according to actual requirements.
After the female die 11 and the male die 12 are closed, a die cavity is formed between the female die 11 and the male die 12;
adding granular or powdery raw materials into a hopper of an injection machine, heating and melting the raw materials to form a flowing state, pushing the raw materials into a mold cavity through a nozzle and a pouring system of the mold under the pushing of a screw rod or a piston of the injection machine, and hardening and shaping in the mold cavity; the pressure, time and temperature of injection in the process can be combined with experience through actual operation to obtain specific parameters;
in the initial state, all the coil springs 29 are in a winding state, and the sealing plates are closed (the winding degrees of the coil springs 29 are different, and the winding degrees of the coil springs 29 on the lower row side are sequentially decreased in an example shown in fig. 7); when the transmission shaft 27 is stationary, the coil spring 29 has a tendency to drive the control shaft 30 to rotate (a tendency to drive the closing plate to close); the coil spring 29 allows the control shaft 30 to rotate without moving the drive shaft 27, and the drive shaft 27 can rotate a minimum of five turns relative to the control shaft 30.
Control valve opening principle: in the injection process, one of the control motors 14 is started to drive one transmission shaft 27 on the most edge to rotate, the transmission shaft 27 drives the control shaft 30 to rotate (after the coil spring 29 is in a natural state, the transmission shaft 27 drives the coil spring 29 to be dispersed firstly, the energy required by the coil spring 29 to be dispersed continuously is far greater than the energy consumed by the direct rotation of the control shaft 30, the energy is changed into the energy required by the transmission shaft 27 to drive the coil spring 29 and the control shaft 30 to rotate simultaneously), the control shaft 30 drives the control plate 32 to rotate, the arc-shaped groove 35 rotates along with the control plate 32, and under the action of the control pin 36, the connecting rod 37 is limited by the chute 39 and only moves radially along the control plate 32, the connecting rod 37 slides along the chute 39, a plurality of control plates 31 are opened, and the sealing plates of the control plates 31 are opened; the die cavity, the exhaust pipe 21, the sealing plate, the pressure relief groove 40, the pressure relief hole 24 and the working space 22 are in a communication state and are communicated with the external space through the screen 13 (the side surface of the screen 13 is of a fine mesh structure, not shown), and the purpose of controlling the air pressure of a certain part of the die cavity is achieved by controlling the air to pass through the section of the exhaust pipe 21 due to the fact that the exhaust pipe 21 is long and narrow and the opening and closing condition of the sealing plate is matched;
control valve closing principle: the same principle as the opening principle of the control motor 14 is that the control motor is reversely rotated, because the energy required by the drive shaft 27 to drive the coil spring 29 to continuously wind is far greater than the energy consumed by the drive shaft 30 to directly rotate, the energy is equivalent to that of the drive shaft 27 to directly drive the control shaft 30 to rotate and then drive the sealing plate to be closed, the outer ring of the sealing cover 25 and the sealing plate separate the exhaust pipe 21 from the pressure relief hole 24, namely, the die cavity is separated from the external space; when the control valve is closed, the control motor 14 continues to rotate, the control shaft 30 cannot continue to rotate, and the transmission shaft 27 drives the coil spring 29 to continue to wind back to the initial state;
multiple control valve linkage principle: when the control motor 14 drives the transmission shaft 27 on the most edge to rotate, the small belt wheel 28, the synchronous belt 34 and the large belt wheel 26 on the other transmission shaft 27 on the transmission shaft 27 drive one transmission shaft 27 adjacent to the small belt wheel to rotate, so that the small belt is large and the angular speed is reduced; then analogize to the example, taking the drawing as an example, when the angular speed ratio is 1:0.7, the first transmission shaft 27 rotates 1 turn, the second rotates about 0.7 turn, the third rotates about 0.49 turn, the fourth rotates about 0.35 turn, and the fifth rotates about 0.24 turn; when the first transmission shaft 27 rotates until the corresponding coil springs 29 become a natural state (influenced by different initial winding degrees, all the coil springs 29 become a natural state at the same time), and when the first transmission shaft continues to rotate for one circle, the corresponding sealing plates are changed from closed to open, at the moment, the sealing plates corresponding to the second transmission shaft 27 are slightly closed, the third transmission shaft is slightly opened and closed, the fourth transmission shaft is slightly opened, and the fifth transmission shaft is slightly opened (the states of gradually opening a plurality of control valves); at the moment, the pressure release of the mould cavity corresponding to the near injection port 33 is slow, the pressure release of the mould cavity corresponding to the far injection port 33 is fast, and the plastic liquid is guided to rapidly flow to one end of the far injection port 33, so that the performance of the formed plastic fitting is well copied, and the generation of weld marks is effectively avoided;
when the injection is completed, it is necessary to close all the control valves (pressure maintaining molding), reversely start the control motor 14, and as in the above principle, the leftmost one of the control valves is already closed after one rotation of the transmission shaft 27, at this time, other control valves are also closed, the control motor 14 continues to rotate, the control shaft 30 cannot continue to rotate, and the transmission shaft 27 drives the coil spring 29 to continue to wind back to the initial state;
before demolding, all control valves are required to be opened (pressure relief demolding), and when the sealing plate corresponding to the first transmission shaft 27 is completely opened, at the moment, the sealing plate corresponding to the second transmission shaft 27 is slightly closed, the third half-opening half-closing is performed, the fourth half-opening is performed, and the fifth half-opening is performed; the control motor 14 continues to rotate until the fifth closure plate is fully opened, at which point the first drive shaft 27 rotates about an additional 4 turns (within the bearing range of the wrap spring 29) relative to its corresponding control shaft 30.
After demolding, the motor 14 is controlled to start, so that the control valves return to the initial state, and the next injection molding is performed.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The foregoing is merely illustrative of the structures of this invention and various modifications, additions and substitutions for those skilled in the art can be made to the described embodiments without departing from the scope of the invention or from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. A high-precision injection mold for automobile plastic parts is characterized in that: the die comprises a female die and a male die, wherein the female die and the male die are matched with each other, an installation space is formed in one side, away from the female die, of the male die, an installation plate is arranged in one side of the installation space, the installation plate is fixedly connected with the male die, a plurality of pressure relief holes are formed in the installation plate, a plurality of exhaust pipes are arranged in the installation space and correspond to the pressure relief holes one by one, one end of each exhaust pipe is fixedly connected with the installation plate, one end, away from the installation plate, of each exhaust pipe is connected with the male die, one end of each exhaust pipe penetrates through the male die, and one end, away from the male die, of each exhaust pipe is connected with the pressure relief holes; and each exhaust pipe is internally provided with a control valve, the control valve is driven by a control motor, and the control motor is detachably arranged on the mounting plate.
2. The high-precision injection mold of an automotive plastic part according to claim 1, wherein: the control valve comprises a plurality of control boards, the control boards comprise sealing boards and side boards, the sealing boards of the control boards are encircled to form a circle, the side boards of the control boards are encircled to form a cylinder, each control board is fixedly provided with a connecting rod on one side away from the sealing boards, a sealing cover is arranged on one side away from the connecting rod, the connecting rod is in sliding connection with the sealing cover, and the sealing cover is fixedly arranged at one end of the exhaust pipe, which is close to the mounting board.
3. The high-precision injection mold of an automotive plastic part according to claim 2, wherein: the sealing cover is close to one side of the control panel sealing plate is fixedly provided with a limiting plate, the periphery of the limiting plate is provided with a plurality of sliding grooves, the sliding grooves are uniformly distributed along the periphery of the limiting plate, the sliding grooves correspond to the control panels one by one, and each connecting rod is arranged in one sliding groove in a sliding mode.
4. A high precision injection mold for automotive plastic parts according to claim 3, characterized in that: the screen plate is fixedly arranged on one side, away from the installation space, of the installation plate, and the control motor is fixedly arranged on the screen plate; the screen plate and the mounting plate form a working space, a transmission shaft is rotatably arranged on the inner wall of one side of the working space, which is close to the screen plate, the transmission shaft penetrates through the screen plate, and the transmission shaft is fixedly connected with an output shaft of the control motor.
5. The high-precision injection mold for automotive plastic parts according to claim 4, wherein: the transmission shaft is close to one side demountable installation of control panel has the control axle, the control axle with sealed lid rotates to be connected, the control axle runs through sealed lid with the limiting disc, the control axle is close to one side of control panel is fixed to be equipped with the control panel, the control panel is last to be fixedly equipped with a plurality of arc grooves, a plurality of arc grooves with a plurality of control panel one-to-one, every all slide in the arc groove and be equipped with a control pin, every the control pin is all fixed to be set up on the connecting rod.
6. The high-precision injection mold for automotive plastic parts according to claim 5, wherein: each transmission shaft is fixedly provided with a small belt wheel and a large belt wheel, the small belt wheels and the large belt wheels on two adjacent transmission shafts are distributed in a staggered mode, and one small belt wheel on one transmission shaft and the large belt wheel on the other adjacent transmission shaft are transmitted through a synchronous belt.
7. The high-precision injection mold for automotive plastic parts according to claim 5, wherein: the transmission shaft is close to one end in the control shaft is equipped with the arrangement chamber, be equipped with the wind spring in the arrangement chamber, the outside of wind spring with the lateral wall fixed connection in arrangement chamber, the inboard of wind spring is fixed to be set up the week side of control shaft, the control shaft with sealed lid rotates to be connected.
8. The high-precision injection mold for automotive plastic parts according to claim 4, wherein: the two control motors are respectively arranged at two sides of the screen plate, each control motor respectively drives one row of control valves, the two rows of control valves and the two control motors are rotationally symmetrical along the center of the cross section of the screen plate, and the two rows of control valves are mutually parallel; one side of one of the control motors is provided with an injection molding opening penetrating through the male die.
9. The high-precision injection mold of an automotive plastic part according to claim 1, wherein: a bottom plate is fixedly arranged on one side, far away from the male die, of the female die, an ejection cylinder is arranged on one side, close to the male die, of the bottom plate, a cylinder barrel of the ejection cylinder is fixedly connected with the bottom plate, an ejection plate is fixedly arranged on a piston rod of the ejection cylinder, an ejection block is fixedly arranged on one side, far away from the bottom plate, of the ejection plate, the ejection block penetrates through the female die, and the ejection block is in sliding connection with the female die; the female die is fixedly provided with a positioning column, and the male die is provided with a positioning hole matched with the positioning column.
10. A high-precision injection molding method of an automobile plastic part, using the high-precision injection mold of an automobile plastic part according to any one of claims 1 to 9, characterized by comprising the steps of:
s1, preparing liquid; adding raw materials into a hopper of an injection machine, and heating and melting the raw materials to form a flowing state;
s2, injection; the screw rod of the injection machine is utilized to control the piston of the injection machine to push, and the piston enters the die cavity through the nozzle and the injection port;
s3, shaping; setting the raw materials in a flowing state in a mold cavity, controlling a motor to start in the process, controlling a plurality of exhaust pipes to be gradually closed, and guiding the raw materials to flow in a flow path of the mold cavity;
s4, cooling; starting a cooling water pump to enable the raw materials to be rapidly hardened in the die cavity;
s5, demolding; after the mold is separated, the ejection cylinder is started to eject the plastic product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310204838.1A CN116080006B (en) | 2023-03-06 | 2023-03-06 | High-precision injection mold and injection molding method for automobile plastic parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310204838.1A CN116080006B (en) | 2023-03-06 | 2023-03-06 | High-precision injection mold and injection molding method for automobile plastic parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116080006A true CN116080006A (en) | 2023-05-09 |
| CN116080006B CN116080006B (en) | 2023-07-04 |
Family
ID=86204622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310204838.1A Active CN116080006B (en) | 2023-03-06 | 2023-03-06 | High-precision injection mold and injection molding method for automobile plastic parts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116080006B (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1112053A (en) * | 1993-11-29 | 1995-11-22 | C·A·格林尔和索恩有限公司 | Shape part produced from foamed plastic, method and apparatus for producing same |
| CN101122346A (en) * | 2007-08-15 | 2008-02-13 | 倚天(南京)金属制品有限公司 | Fluid outlet metering valve |
| CN101181813A (en) * | 2007-12-14 | 2008-05-21 | 广州一道注塑机械有限公司 | Major-minor multi-push injection mold pushing mechanism |
| JP2008137359A (en) * | 2006-12-05 | 2008-06-19 | Nichirin Co Ltd | Plastic-rubber compound bending hose molding die and molding method |
| CN101422952A (en) * | 2008-10-17 | 2009-05-06 | 宁波舜宇模具有限公司 | Composite multifunctional slipper mechanism |
| CN101609738A (en) * | 2009-07-21 | 2009-12-23 | 国网电力科学研究院武汉南瑞有限责任公司 | Be used for forming method and mould thereof that the HV cable accessories insulated part is made |
| CN101634368A (en) * | 2008-07-22 | 2010-01-27 | 徐永吉 | Small-sized vent valve for tire vulcanization mould |
| CN101746028A (en) * | 2008-12-22 | 2010-06-23 | 重庆工商大学 | Needle-valve order hot runner and gas-assisted injection molding device |
| US20110233800A1 (en) * | 2010-03-23 | 2011-09-29 | Canon Kabushiki Kaisha | Plastics molding system and optical element formed by the same |
| US8316820B1 (en) * | 2010-11-05 | 2012-11-27 | Edward Cammarata | Throttle providing unobstructed air flow path when fully open and vortex generating configuration when partly open |
| US20180229411A1 (en) * | 2017-02-15 | 2018-08-16 | Daniel Aquilina | Injection mold for ultra thin wall components |
| CN109093940A (en) * | 2018-08-03 | 2018-12-28 | 昆山弘正电子科技有限公司 | Plastic lock catch injection forming mold and the Shooting Technique for manufacturing plastic lock catch |
| CN112643962A (en) * | 2019-10-10 | 2021-04-13 | 圣创实业(深圳)有限公司 | Injection molding process of mobile phone protective sleeve |
| JP2021088167A (en) * | 2019-12-03 | 2021-06-10 | 呉剛 | Injection molding of pp plastic spring |
| CN217891755U (en) * | 2021-09-24 | 2022-11-25 | 天诺塑胶工业(昆山)有限公司 | Anti-adhesion injection mold for plastic part reel |
-
2023
- 2023-03-06 CN CN202310204838.1A patent/CN116080006B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1112053A (en) * | 1993-11-29 | 1995-11-22 | C·A·格林尔和索恩有限公司 | Shape part produced from foamed plastic, method and apparatus for producing same |
| JP2008137359A (en) * | 2006-12-05 | 2008-06-19 | Nichirin Co Ltd | Plastic-rubber compound bending hose molding die and molding method |
| CN101122346A (en) * | 2007-08-15 | 2008-02-13 | 倚天(南京)金属制品有限公司 | Fluid outlet metering valve |
| CN101181813A (en) * | 2007-12-14 | 2008-05-21 | 广州一道注塑机械有限公司 | Major-minor multi-push injection mold pushing mechanism |
| CN101634368A (en) * | 2008-07-22 | 2010-01-27 | 徐永吉 | Small-sized vent valve for tire vulcanization mould |
| CN101422952A (en) * | 2008-10-17 | 2009-05-06 | 宁波舜宇模具有限公司 | Composite multifunctional slipper mechanism |
| CN101746028A (en) * | 2008-12-22 | 2010-06-23 | 重庆工商大学 | Needle-valve order hot runner and gas-assisted injection molding device |
| CN101609738A (en) * | 2009-07-21 | 2009-12-23 | 国网电力科学研究院武汉南瑞有限责任公司 | Be used for forming method and mould thereof that the HV cable accessories insulated part is made |
| US20110233800A1 (en) * | 2010-03-23 | 2011-09-29 | Canon Kabushiki Kaisha | Plastics molding system and optical element formed by the same |
| US8316820B1 (en) * | 2010-11-05 | 2012-11-27 | Edward Cammarata | Throttle providing unobstructed air flow path when fully open and vortex generating configuration when partly open |
| US20180229411A1 (en) * | 2017-02-15 | 2018-08-16 | Daniel Aquilina | Injection mold for ultra thin wall components |
| CN109093940A (en) * | 2018-08-03 | 2018-12-28 | 昆山弘正电子科技有限公司 | Plastic lock catch injection forming mold and the Shooting Technique for manufacturing plastic lock catch |
| CN112643962A (en) * | 2019-10-10 | 2021-04-13 | 圣创实业(深圳)有限公司 | Injection molding process of mobile phone protective sleeve |
| JP2021088167A (en) * | 2019-12-03 | 2021-06-10 | 呉剛 | Injection molding of pp plastic spring |
| CN217891755U (en) * | 2021-09-24 | 2022-11-25 | 天诺塑胶工业(昆山)有限公司 | Anti-adhesion injection mold for plastic part reel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116080006B (en) | 2023-07-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2149445B1 (en) | In-mold degassing structure, and mold having the structure | |
| CN104608325A (en) | Injection molding machine capable of stirring | |
| US6638047B2 (en) | Molding machine | |
| CN116080006B (en) | High-precision injection mold and injection molding method for automobile plastic parts | |
| CA2508012C (en) | Method of designing and producing a mold | |
| CN207841958U (en) | A kind of Double layer rotating injection mold structure for monochromatic molding machine | |
| CN211415974U (en) | Casting mold for solid tire | |
| CN201128226Y (en) | Mould for refill opening of automobile oil tank | |
| CN202572811U (en) | Water-cooled needle-valve nozzle for cold runner injection molding dies | |
| CN201098978Y (en) | Plastic inspection well launder body die-casting forming die | |
| JP2002172657A (en) | In-mold coating mold and method | |
| CN102416683B (en) | Production method of MC (monomer casting) nylon valve | |
| CN212509650U (en) | Tap body and manufacturing mold thereof | |
| CN207448970U (en) | Rotate the two-colored directed graph of plectane control mold cores turned position | |
| CN113146958A (en) | Injection mold with secondary injection molding function and injection molding method thereof | |
| CN207983855U (en) | A kind of super thick plastic cement products based on injection molding | |
| CN219095744U (en) | Injection molding cooling device | |
| CN108422621B (en) | Three-color mold with stainless steel inserts and three-color triangular window decorative plate | |
| CN111452300A (en) | Rotary core type pressure injection double-color injection mold and injection molding method | |
| CN111687396A (en) | Integrated water-through mold | |
| CN215825824U (en) | A hinge tooth core rotary seal cooling structure for injection mold | |
| CN218139591U (en) | But fast assembly and even injection mold structure of cooling | |
| CN107627550A (en) | Rotate the two-colored directed graph and its method of plectane control mold cores turned position | |
| CN220903949U (en) | Middle glue injection equipment for lifting injection runner inside cavity | |
| CN203973910U (en) | A kind of injection machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |