CN116638720A - Plastic mold and injection molding method thereof - Google Patents
Plastic mold and injection molding method thereof Download PDFInfo
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- CN116638720A CN116638720A CN202310405960.5A CN202310405960A CN116638720A CN 116638720 A CN116638720 A CN 116638720A CN 202310405960 A CN202310405960 A CN 202310405960A CN 116638720 A CN116638720 A CN 116638720A
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- 239000004033 plastic Substances 0.000 title claims abstract description 30
- 229920003023 plastic Polymers 0.000 title claims abstract description 30
- 238000001746 injection moulding Methods 0.000 title claims abstract description 29
- 238000002347 injection Methods 0.000 claims abstract description 27
- 239000007924 injection Substances 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims 2
- 239000000155 melt Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- B29C45/76—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
- B29C45/1753—Cleaning or purging, e.g. of the injection unit
-
- 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
- B29C45/72—Heating or cooling
- B29C45/7207—Heating or cooling of the moulded 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
- 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
- B29C2945/76006—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
- B29C2945/76177—Location of measurement
- B29C2945/76254—Mould
- B29C2945/76257—Mould cavity
-
- 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
Abstract
The invention discloses a plastic mold and an injection molding method thereof, the plastic mold comprises a fixed plate and a movable plate, a first template is arranged at the bottom of the fixed plate, a supporting plate is arranged above the movable plate, a receiving plate is arranged above the supporting plate, a second template is arranged above the receiving plate, a first mold core is arranged in the first template, a second mold core is correspondingly arranged on the second template, a cavity is formed between the first mold core and the second mold core, a mounting hole is formed in the top of the second mold core, a pressure sensor is arranged in the mounting hole, the pressure sensor is flush with the top of the second mold core, and an air injection device is arranged on the side edge of the second mold core. The invention can detect and calculate the pressure in the plastic mould and quicken the demoulding time.
Description
Technical Field
The invention belongs to the technical field of molds, and particularly relates to a plastic mold and an injection molding method thereof.
Background
At present, the injection molding process of plastic products is developed towards shortening injection molding cycle and improving production efficiency, and in order to improve production efficiency, plasticizing capacity is increased, injection time is shortened, template moving speed is accelerated and the like in the injection molding process of an injection mold.
The Chinese patent with application number 2022109723710 discloses an injection molding production process of an industrial injection molding part, which comprises the following steps: s1, pretreatment of a die: cleaning, brushing a release agent and preheating an injection mold of the injection molding part; s2, selecting and processing raw materials: selecting raw materials of an injection molding piece, mixing and stirring, and extruding for standby through a screw extruder; s3, raw material injection: injecting the raw material after S2 treatment into a mould after S1 pretreatment through a nozzle, wherein the injection pressure is 60-150Mpa, and the injection pressure is maintained for 20-30S; s4, pressure maintaining: continuously feeding the injection molding machine nozzle into the cavity, continuously applying pressure, compacting the melt, wherein the pressure in the pressure maintaining stage is 75-95% of the filling maximum pressure, the pressure is kept at 40-80kg/cm < 3 >, and the pressure maintaining time is 30-60min; s5, demolding; s6, cleaning the injection molding piece and the mold; s7, spraying the injection molding piece. This scheme is through carrying out preliminary treatment to the mould, not only can increase the cleanliness of mould, reduces the influence of dust impurity to the injection molding, simultaneously after raw materials injection molding, is convenient for carry out the drawing of patterns to the injection molding and handles, is favorable to increasing work efficiency.
The above-mentioned patent can realize increasing the drawing of patterns rate effect, but when drawing of patterns, need wait for a certain time, this period of time is waiting for the interior cavity temperature of mould to cool to appointed temperature and interior cavity pressure of mould to tend to stabilize, only can carry out the drawing of patterns after the temperature cools down and interior cavity pressure of mould tends to stabilize, otherwise can cause the drawing of patterns difficulty, wherein temperature factor can detect through temperature sensor, and pressure stabilization then need wait for longer time, wait for inside pressure to be close with outside pressure and can regard as stabilizing, this can increase the drawing of patterns time.
Disclosure of Invention
In order to solve the problems, the invention provides a plastic die, which comprises a fixed plate and a movable plate, wherein a first template is arranged at the bottom of the fixed plate, a supporting plate is arranged above the movable plate, a receiving plate is arranged above the supporting plate, a second template is arranged above the receiving plate, a first core is arranged in the first template, a second core is correspondingly arranged on the second template, a cavity is formed between the first core and the second core, a mounting hole is formed in the top of the second core, a pressure sensor is arranged in the mounting hole and is flush with the top of the second core, and an air injection device is arranged on the side edge of the second template.
Preferably, a first cavity is formed in the first template, a first core plate is arranged in the first cavity, a plurality of first cores are arranged on the first core plate, a second cavity is formed in the second template, a second core plate is arranged in the second cavity, and a plurality of second cores corresponding to the first cores are arranged on the second core plate.
Preferably, the movable plate is provided with an ejection mechanism, the ejection mechanism comprises an ejection cylinder, a top plate and a thimble, the output end of the ejection cylinder is connected with the top plate, the thimble is connected with the top of the top plate, and the thimble passes through the bearing plate and the first template to prop against the second template.
Preferably, the air injection device comprises an air source and an air nozzle, the air nozzle protrudes out of the surface of the second template, the first template is provided with a guide hole in cooperation with the air nozzle, the air nozzle is provided with an air injection hole, the air injection hole faces the second core, and the air source is connected with the air nozzle.
Preferably, a circulation channel is arranged in the bearing plate, one end of the circulation channel is connected with the air nozzle, the other end of the circulation channel is connected with the air source, and a sealing ring is arranged at one end of the circulation channel, which is close to the spray nozzle.
An injection molding method of a plastic mold comprises the following steps;
s1, injecting and filling a mold, namely injecting a plastic raw material into a cavity of the mold until the interior of the mold cavity is injected to 90% -95%, and stopping injection;
s2, maintaining pressure, and continuously applying pressure to the die until the pouring gate is cooled and closed;
s3, cooling and shaping, namely opening a cooling water pipe, and injecting water into the circulating cooling water pipes on the first template and the second template for cooling until the temperature of the die is reduced to a specified temperature;
s4, calculating the cavity pressure, and waiting for the stability of the cavity pressure;
s5, demolding the plastic, and separating the mold through a thimble mechanism.
Preferably, the measuring method for stabilizing the pressure of each cavity in the step S4 comprises the following steps of;
A. collecting the internal pressure value of each cavity;
B. calculating the average value of each pressure value;
C. the internal pressure value of each cavity is differed from the average value to obtain a difference value; if all the differences are smaller than the specified threshold, the pressure of each cavity is considered to be stable, and if a certain difference is larger than the specified threshold, the step A is executed again.
Preferably, the specified threshold in the step C is 2.0.
Preferably, the method further comprises a step S6, wherein the step S6 is to blow the demoulded die by using a blowing device and cool the demoulded die waste heat.
Preferably, the temperature of the die in the step S3 is reduced to 50-65 degrees.
The invention has the advantages that:
1. through detecting the inside pressure of die cavity in this scheme, can be convenient for operating personnel learn the inside pressure information of die cavity, after the inside pressure of die cavity is stable, can in time carry out the drawing of patterns, reduce drawing of patterns latency, promote product shaping efficiency.
2. The air injection device is arranged in the scheme, air injection can be carried out on the demoulded product, preheating of the product can be reduced rapidly, the die is cleaned, and injection molding of the next batch of products can be carried out rapidly.
2. According to the scheme, the moment that the pressure in the cavity is stable can be calculated through a specific method, and the demolding time is shortened.
Drawings
FIG. 1 is a block diagram of a mold according to the present invention;
FIG. 2 is a drawing of a demolding state of the present invention;
FIG. 3 is a diagram of a second template structure of the present invention;
fig. 4 is a flow chart of the method of the present invention.
In the figure: the device comprises a fixed plate 1, a movable plate 2, a first template 3, a support plate 4, a bearing plate 5, a second template 6, a first core 7, a second core 8, a mounting hole 9, a pressure sensor 10, a first cavity 11, a first core plate 12, a second cavity 13, a second core plate 14, an ejection cylinder 15, a top plate 16, an ejector pin 17, an air source 18, an air nozzle 19, a guide hole 20, an air nozzle 21, a circulation channel 22 and a sealing ring 23.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. Meanwhile, when an element is referred to as being "fixed" or "disposed" on another element, it may be directly on the other element or intervening elements may be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "fixedly connected to" another element, it can be conventionally connected by welding or bolting or gluing. In summary, it will be understood by those of ordinary skill in the art that the specific meaning of the terms described above in this disclosure is to be understood in a specific sense.
Example 1
1-3, including fixed plate 1 and movable plate 2, the bottom of fixed plate 1 is equipped with first template 3, is equipped with first cavity 11 on the first template 3, is equipped with first core 12 in the first cavity 11, is equipped with a plurality of first cores 7 on the first core 12, and there is the locating plate above fixed plate 1 through bolted connection, is equipped with the feed inlet on the locating plate that is the runner, and the feed inlet runs through locating plate, fixed plate 1 and movable plate 2.
The top of movable plate 2 is equipped with backup pad 4, and the top of backup pad 4 is equipped with accepts board 5, accepts the top of board 5 and is equipped with second template 6, is equipped with second cavity 13 on the second template 6, is equipped with second core 14 in the second cavity 13, be equipped with a plurality of second cores 8 that correspond with first core 7 on the second core, be formed with the die cavity between first core 7 and the second core 8, the plastics raw materials gets into the cooling shaping behind the die cavity by the feed inlet. The movable plate 2 is provided with an ejection mechanism, the ejection mechanism comprises an ejection cylinder 15, a top plate 16 and ejector pins 17, the output end of the ejection cylinder 15 is connected with the top plate 16, a plurality of ejector pins 17 are connected above the top plate 16, the ejector pins 17 penetrate through the bearing plate 5 and the first template 3 to be propped against the second template 6, when demoulding is carried out, the ejection cylinder 15 drives the top plate 16 to move upwards, the top plate 16 drives the ejector pins 17 to jack up, the first template 3 and the second template 6 are separated, and demoulding work is completed.
The top at second core 8 is equipped with mounting hole 9, is equipped with pressure sensor 10 in the mounting hole 9, and pressure sensor 10 flushes with second core 8 top, and pressure sensor 10 is arranged in the internal pressure of response die cavity, can detect out the pressure through the pressure data of inside and tend to steady time, can demold the mould faster, promotes product injection moulding's efficiency.
The side of the second template 6 is provided with an air injection device, and in combination with fig. 3, the air injection device comprises an air nozzle 19, the air nozzle 19 is of a protruding cylindrical structure, the first template 3 is provided with a guide hole 20 corresponding to the air nozzle 19, and the air nozzle 19 and the guide hole 20 can play a role in guiding on one hand. On the other hand, two air injection holes 21 are provided in the air nozzle 19, the two air injection holes 21 being oriented respectively towards different second cores 8. In this embodiment, at least two air nozzles 19 are provided, and are respectively located at two sides of the second template 6. The air injection device further comprises an external air source 18, a circulation channel 22 is arranged in the bearing plate 5, one end of the circulation channel 22 is connected with the air nozzle 19, the other end of the circulation channel 22 is connected with the air source 18, and the air source 18 sprays high-speed air flow to the second mold core 8 after demolding through the air injection hole 21 through the circulation channel 22. The end of the circulation channel 22, which is close to the spray nozzle, is provided with a sealing ring 23, so that the sealing effect can be improved.
In this embodiment, before demolding, the mold is cooled first, circulating water channels are arranged on the first core plate 12 and the second core plate 14, cooling water is injected to cool the mold, meanwhile, the internal pressure of the cavity is detected, and when the injection molding is stopped, the gate is cooled and sealed, the internal pressure of the cavity is gradually reduced until the internal air pressure is the same as the external air pressure. In order to increase the demolding efficiency, the pressure sensor 10 is used for detecting the pressure in the cavity, and when the pressure tends to be stable, demolding can be performed. After demolding, with reference to fig. 2, the product after demolding can be sprayed through the air spraying device, so that the preheating of the product and the cleaning of the die can be quickly reduced, and the injection molding of the next batch of products can be quickly performed.
Example 2
An injection molding method of a plastic mold comprises the following steps;
s1, injecting and filling a mold, namely injecting a plastic raw material into a cavity of the mold until the interior of the mold cavity is injected to 95%, and stopping injection;
s2, maintaining pressure, and continuously applying pressure to the die until the pouring gate is cooled and closed;
s3, cooling and shaping, namely opening cooling water pipes, and injecting water into the circulating cooling water pipes on the first template 3 and the second template 6 for cooling until the temperature of the die is reduced to 50 DEG;
s4, calculating the cavity pressure, and waiting for the stability of the cavity pressure; eight cavities are arranged in the embodiment, and the measuring method for the pressure of each cavity to be stable comprises the following steps of;
A. collecting the internal pressure value of each cavity;
B. calculating the average value of each pressure value;
C. the internal pressure value of each cavity is differed from the average value to obtain a difference value; if all the differences are smaller than the specified threshold, the pressure of each cavity is considered to be stable, and if a certain difference is larger than the specified threshold, the step A is executed again.
In the embodiment, the cavity pressure is monitored at different time periods after the pressure maintaining is completed, and the data table is shown in Table 1 and shows the unit Mpa
In this example, T1 is recorded from the completion of the dwell phase, the flow front of the plastic melt reaching the pressure sensor 10, and the pressure curve is obtained. The filling stage pressure increases linearly with time. And (5) ending the filling stage, and finishing the filling of the die. After filling the mold, the melt is compressed to ensure the profile of the injection molded part. The compression stage is followed by a dwell stage. Since the plastic is significantly cooled by thermal shrinkage and then the volume is reduced, the plastic is greatly shrunk by cooling, and thus pressure maintenance is necessary. In the dwell phase, up to 10% of the injection molding volume is pressed into the mold cavity in order to compensate for thermal shrinkage. After cooling, the holding pressure is transmitted, and as the melt hardens, the flow path narrows, and the difficulty of the melt flowing from the screw antechamber into the mold cavity increases. The continuous heat shrinkage is accompanied by a continuous decrease in melt flow, resulting in a decrease in pressure within the mold cavity, ultimately reaching normal atmospheric pressure levels.
As shown in table 1, in the T1 stage, the average value of each pressure was about 38.8Mpa, the difference between the average value and each cavity pressure value was found to be 5.8, and the difference between the first cavity pressure value and the average value was found to be greater than the prescribed threshold value 2.0, in the T2 stage, the average value of each pressure was about 29.8Mpa, the difference between the average value and each cavity pressure value was found to be 2.2, and in the T3 stage, the average value of each pressure was found to be about 15.3Mpa, and the difference between the average value and each cavity pressure value was found to be less than the prescribed threshold value, so that it was determined that the pressure inside each cavity tended to be stable, and demolding was possible. Stage T4 is a conventional demolding stage in which the pressure within the mold cavity drops to a level near normal atmospheric pressure. The embodiment can judge that the internal pressure tends to be stable in the T3 stage through calculation, and the demolding pressure condition is met for carrying out
And finally, step S5, demolding the plastic, and separating the mold through a thimble 17 mechanism. In contrast to the conventional demolding process,
saving demoulding time. After demolding, the air injection device is used for blowing air to the demolding mold, the residual heat of the demolding mold is cooled, and meanwhile, the mold can be cleaned to a certain extent.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A plastic mold, characterized in that: including fixed plate (1) and movable plate (2), the bottom of fixed plate (1) is equipped with first template (3), the top of movable plate (2) is equipped with backup pad (4), the top of backup pad (4) is equipped with and accepts board (5), the top of accepting board (5) is equipped with second template (6), be equipped with first core (7) in first template (3), correspond on second template (6) to be equipped with second core (8), be formed with the die cavity between first core (7) and second core (8), the top of second core (8) is equipped with mounting hole (9), be equipped with pressure sensor (10) in mounting hole (9), pressure sensor (10) flush with second core (8) top, the side of second template (6) is equipped with jet equipment.
2. A plastic mould according to claim 1, characterized in that: the novel mold is characterized in that a first cavity (11) is formed in the first mold plate (3), a first core plate (12) is arranged in the first cavity (11), a plurality of first cores (7) are arranged on the first core plate (12), a second cavity (13) is formed in the second mold plate (6), a second core plate (14) is arranged in the second cavity (13), and a plurality of second cores (8) corresponding to the first cores (7) are arranged on the second core plate.
3. A plastic mould according to claim 2, characterized in that: the movable plate (2) is provided with an ejection mechanism, the ejection mechanism comprises an ejection cylinder (15), a top plate (16) and an ejector pin (17), the output end of the ejection cylinder (15) is connected with the top plate (16), the ejector pin (17) is connected above the top plate (16), and the ejector pin (17) passes through the bearing plate (5) and the first template (3) to be abutted against the second template (6).
4. A plastic mould according to claim 3, characterized in that: the air injection device comprises an air source (18) and an air nozzle (19), wherein the air nozzle (19) protrudes out of the surface of the second template (6), a guide hole (20) is formed in the first template (3) in cooperation with the air nozzle (19), an air injection hole (21) is formed in the air nozzle (19), the air injection hole (21) faces towards the second mold core (8), and the air source (18) is connected with the air nozzle (19).
5. The plastic mold of claim 4, wherein: the paint spraying device is characterized in that a circulating channel (22) is arranged in the bearing plate (5), one end of the circulating channel (22) is connected with the air nozzle (19), the other end of the circulating channel (22) is connected with the air source (18), and a sealing ring (23) is arranged at one end, close to the paint spraying nozzle, of the circulating channel (22).
6. An injection molding method of a plastic mold is characterized in that: comprises the following steps of;
s1, injecting and filling a mold, namely injecting a plastic raw material into a cavity of the mold until the interior of the mold cavity is injected to 90% -95%, and stopping injection;
s2, maintaining pressure, and continuously applying pressure to the die until the pouring gate is cooled and closed;
s3, cooling and shaping, namely opening a cooling water pipe, and injecting water into the circulating cooling water pipes on the first template (3) and the second template (6) for cooling until the temperature of the die is reduced to a specified temperature;
s4, calculating the cavity pressure, and waiting for the stability of the cavity pressure;
s5, demolding the plastic, and separating the mold through a thimble (17) mechanism.
7. The injection molding method of a plastic mold according to claim 6, wherein: the measuring method for the pressure of each cavity in the step S4 is that the pressure tends to be stable;
A. collecting the internal pressure value of each cavity;
B. calculating the average value of each pressure value;
C. the internal pressure value of each cavity is differed from the average value to obtain a difference value; if all the differences are smaller than the specified threshold, the pressure of each cavity is considered to be stable, and if a certain difference is larger than the specified threshold, the step A is executed again.
8. The injection molding method of a plastic mold according to claim 7, wherein: the specified threshold in step C is 2.0.
9. The injection molding method of a plastic mold according to claim 8, wherein: the method further comprises a step S6, wherein the step S6 is to blow the demoulded die by using a blowing device and cool the demoulded die waste heat.
10. The injection molding method of a plastic mold according to claim 8, wherein: and in the step S3, the temperature of the die is reduced to 50-65 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310405960.5A CN116638720A (en) | 2023-04-17 | 2023-04-17 | Plastic mold and injection molding method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310405960.5A CN116638720A (en) | 2023-04-17 | 2023-04-17 | Plastic mold and injection molding method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN116638720A true CN116638720A (en) | 2023-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310405960.5A Pending CN116638720A (en) | 2023-04-17 | 2023-04-17 | Plastic mold and injection molding method thereof |
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| CN (1) | CN116638720A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117086284A (en) * | 2023-10-19 | 2023-11-21 | 江苏华兴特钢铸造有限公司 | Pump body casting die capable of being cooled rapidly |
-
2023
- 2023-04-17 CN CN202310405960.5A patent/CN116638720A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117086284A (en) * | 2023-10-19 | 2023-11-21 | 江苏华兴特钢铸造有限公司 | Pump body casting die capable of being cooled rapidly |
| CN117086284B (en) * | 2023-10-19 | 2023-12-26 | 江苏华兴特钢铸造有限公司 | Pump body casting die capable of being cooled rapidly |
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