A mold and injection molding system

Abstract

The application relates to the technical field of polymer processing, and discloses a mold and an injection molding system, wherein the mold comprises a body, the body comprises a first mold plate and a second mold plate, a mold core is arranged on the first mold plate, the mold core is provided with a cavity and a flow channel communicated with the cavity, a first temperature sensor is arranged on the first mold plate, and a second temperature sensor is arranged on the second mold plate; temperature control assemblies are arranged in the first mold plate and the second mold plate, and the first temperature sensor, the second temperature sensor and the temperature control assemblies are connected with an external temperature control module; the first mold plate and the second mold plate can be kept at the same temperature or different temperatures through the temperature control module; a plurality of samples are prepared under different temperature relationships of the first mold plate and the second mold plate, the relative positions of tiger stripes on upper and lower surfaces of the plurality of samples on a horizontal plane are observed, the influence of the temperature relationship of the first mold plate and the second mold plate on unstable flow of polymers is researched, and the formation mechanism of the tiger stripes is researched.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer processing, in particular to a mold and an injection molding system. Background Art

[0002] During the injection molding process, polymer materials such as polypropylene / ethylene propylene rubber blends and high-impact polystyrene will flow unstably due to thin product walls, long cavities, small gates, and high injection rates, resulting in tiger-skin defects (periodic light and dark stripes) on the surface of the product, which greatly damages the appearance of the product.

[0003] There are many methods in the industry that can solve the tiger stripe defect, such as increasing the mold temperature, reducing the injection rate, increasing the gate, and increasing the wall thickness of the part. However, these methods are all empirical in nature. Therefore, although there are methods to solve the tiger stripe defect, the formation mechanism of tiger stripes is not clear. In addition, there is no mold in the existing technology that can be used to study the factors of unstable flow of polymers, making it impossible to study the formation mechanism of tiger stripes. Summary of the Invention

[0004] The purpose of the present invention is to provide a mold that can be used to study the unstable flow factors of polymers so as to study the formation mechanism of tiger stripes.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a mold, including a main body, the main body including a first template and a second template, the first template is provided with a mold core, the mold core is provided with a cavity and a runner, the runner is connected to the cavity, the first template is provided with a first temperature sensor, and the second template is provided with a second temperature sensor; the first template and the second template are both provided with a temperature control component, and the first temperature sensor, the second temperature sensor, and the temperature control component are used to connect with an external temperature control module.

[0006] In a specific embodiment of the present invention, a pressure sensor for detecting molding pressure is further connected to the cavity.

[0007] In a specific embodiment of the present invention, a gate insert is detachably connected to the mold core, and a gate runner is provided on the gate insert. One end of the gate runner is connected to the runner, and the other end is a gate end, and the gate end is connected to the input end of the cavity.

[0008] In a specific embodiment of the present invention, the cavity is a U-shaped structure, both ends of which are input ends; the gate inserts are two that respectively cooperate with the two input ends of the cavity; the runner includes a main channel and two branch channels connected to the main channel, and the two branch channels are respectively connected to the gate runners of the two gate inserts.

[0009] In a specific embodiment of the present invention, the mold core is further provided with a throttle valve cooperating with the branch channel, and the number of the throttle valves is equal to the number of the branch channels and corresponds one to one.

[0010] In a specific embodiment of the present invention, a flow-disturbing element is detachably connected to the cavity, and the flow-disturbing element includes a flow-disturbing rod for disturbing the flow state of the polymer.

[0011] In a specific embodiment of the present invention, a cover plate for cooperating with the mold core is connected to the second mold plate;

[0012] The detection end of the first temperature sensor is connected to the mold core, and the detection end of the second temperature sensor is connected to the cover plate;

[0013] The temperature control component on the first template extends to the mold core, and the temperature control component on the second template extends to the cover plate.

[0014] In a specific embodiment of the present invention, the mold core is connected to the first template in a detachable manner.

[0015] The present invention also proposes an injection molding system, including an injection molding machine and a temperature control module; and also includes the mold as described above, the mold is arranged on the injection molding machine, and the first temperature sensor, the second temperature sensor, and the temperature control component are connected to the temperature control module.

[0016] In a specific embodiment of the present invention, the temperature control module includes a control host and a rapid cooling and heating mold temperature component, the rapid cooling and heating mold temperature component includes a rapid cooling and heating mold temperature controller, and the rapid cooling and heating mold temperature controller includes a heat medium pipe, a refrigerant pipe and an air recovery pipe; the temperature control component is a temperature control pipe; the temperature control component in the first template and the second template can be selectively connected to the heat medium pipe, the refrigerant pipe and the air recovery pipe; the first temperature sensor, the second temperature sensor, and the rapid cooling and heating mold temperature controller are all electrically connected to the control host.

[0017] Compared with the prior art, the mold and injection molding system of the embodiment of the present invention have the following advantages:

[0018] During the injection molding process, unstable flow of polymer will cause tiger stripes to appear on the sample; the mold described in the present invention is used on an injection molding machine, and the injection molding machine injects polymer melt into the cavity through the flow channel to form a sample; in actual use, based on the signals of the first temperature sensor and the second temperature sensor, the temperature control module controls the operation of the corresponding temperature control component, based on which the first template and the second template can be kept at the same temperature or different temperatures; multiple samples are made under different temperature relationships between the first template and the second template, and the relative positions of the tiger stripes on the upper and lower surfaces of the multiple samples on the horizontal plane are observed to study the influence of the temperature relationship between the first template and the second template on the unstable flow of the polymer, thereby studying the formation mechanism of the tiger stripes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a structural diagram of an embodiment of the present invention;

[0020] Figure 2 This is a structural diagram of the mold core and the first template in accordance with an embodiment of the present invention;

[0021] Figure 3 This is an embodiment of the present invention Figure 2 Enlarged schematic diagram of E;

[0022] Figure 4 This is a structural diagram of the cover plate and the second template in accordance with an embodiment of the present invention;

[0023] Figure 5 It is a schematic diagram of the cooperation between the temperature control module and the temperature control assembly according to an embodiment of the present invention.

[0024] In the figure, 10, main body; 1, first template; 2, second template; 3, mold core; 31, cavity; 32, runner; 321, main channel; 322, branch channel; 33, gate insert; 34, throttle valve; 35, spoiler; 4, cover; 5, first locking assembly; 6, second locking assembly; A, first temperature sensor; B, second temperature sensor; C, temperature control assembly; D, pressure sensor; a, gate runner; 20, temperature control module; 21, control host; 22, rapid cooling and heating mold temperature controller. DETAILED DESCRIPTION

[0025] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0026] like Figures 1 to 4As shown, a mold of a preferred embodiment of an embodiment of the present invention includes a main body 10, and the main body 10 includes a first template 1 and a second template 2. The first template 1 is provided with a mold core 3, and the mold core 3 is provided with a cavity 31 and a runner 32. The runner 32 is connected to the cavity 31. The first template 1 is provided with a first temperature sensor A, and the second template 2 is provided with a second temperature sensor B; the first template 1 and the second template 2 are both provided with a temperature control component C, and the first temperature sensor A, the second temperature sensor B, and the temperature control component C are used to connect with an external temperature control module.

[0027] During the injection molding process, unstable flow of the polymer will cause tiger stripes to appear on the sample; the mold described in the present invention is used on an injection molding machine, and the injection molding machine injects polymer melt into the cavity 31 through the flow channel 32 to form a sample; in actual use, based on the signals of the first temperature sensor A and the second temperature sensor B, the corresponding temperature control component C is controlled by the control module to operate, based on which the first template 1 and the second template 2 can be kept at the same temperature or different temperatures; multiple samples are made under different temperature relationships between the first template 1 and the second template 2, and the relative positions of the tiger stripes on the upper and lower surfaces of the multiple samples on the horizontal plane are observed to study the influence of the temperature relationship between the first template 1 and the second template 2 on the unstable flow of the polymer, thereby studying the formation mechanism of the tiger stripes.

[0028] Furthermore, a pressure sensor D for detecting molding pressure is connected to the mold cavity 31. In practical applications, multiple samples are produced with molding pressure as a single variable. By observing the formation of tiger stripes in multiple samples, the effect of molding pressure on the unstable flow of polymers can be studied. In other words, the effect of vertical force field changes on the unstable flow of polymers can be studied, thereby studying the formation mechanism of tiger stripes.

[0029] In-mold decoration technology refers to the process of feeding the printed film into the mold cavity 31 and positioning it. After injection molding, the pattern on the film is transferred to the injected product. In-mold decoration technology is used to produce samples. Since the film is fixed in the mold cavity 31, it can change the friction and shear stress of the mold cavity 31. Friction and shear stress are forces in the horizontal direction. By fixing different films, the horizontal force field can be changed. Multiple samples are made with the film as a single variable. By observing the formation of tiger stripes on multiple samples, the influence of horizontal force field changes on the unstable flow of polymers can be studied, thereby studying the formation mechanism of tiger stripes.

[0030] Furthermore, a gate insert 33 is detachably connected to the mold core 3. The gate insert 33 is provided with a gate runner a. One end of the gate runner a is connected to the runner 32, and the other end is a gate end, which is connected to the input end of the cavity 31. The gate end is the gate for inputting polymer melt into the cavity 31. Multiple samples were prepared using the shape of the gate as a single variable. By observing the formation of tiger stripes in multiple samples, the effect of the gate shape on the unstable flow of the polymer can be studied, thereby studying the formation mechanism of tiger stripes.

[0031] Alternatively, multiple samples can be made with the gate size as a single variable. By observing the formation of tiger stripes in multiple samples, the effect of gate size on the unstable flow of polymer can be studied, thereby studying the formation mechanism of tiger stripes.

[0032] Furthermore, the mold cavity 31 is a U-shaped structure, both ends of which are input ends; the gate inserts 33 are two respectively matched with the two input ends of the mold cavity 31; the runner 32 includes a main runner 321 and two branch runners 322 connected to the main runner 321, and the two branch runners 322 are respectively connected to the gate runners a of the two gate inserts 33;

[0033] That is, the mold cavity 31 is a double-port glue injection structure. By preparing the sample in the double-port glue injection method, the formation of tiger stripes in the case of double-port glue injection can be studied;

[0034] As a preferred embodiment of the present invention, the mold core 3 is further provided with a throttle valve 34 , and the number of the throttle valves 34 is equal to the number of the branch channels 322 and corresponds one to one;

[0035] Specifically, the throttle valve 34 can be used to adjust the flow rate. In this embodiment, the throttle valve 34 is used as an on-off valve, which can close the corresponding branch channel 322 or make the corresponding branch channel 322 conductive.

[0036] In practical applications, one of the branch channels 322 is closed, so that the cavity 31 has a single-port glue injection structure. Samples are prepared by the single-port glue injection method to study the formation of tiger stripes under the single-port glue injection method. Since there are two ways to inject glue into the cavity 31, taking the side of the mold core 3 with the cavity 31 as an example, the cavity 31 has two ways of injecting glue: left single-port glue injection and right single-port glue injection.

[0037] The samples were prepared with the glue feeding method as a single variable, that is, left single-port glue feeding, right single-port glue feeding, or double-port glue feeding. By observing the formation of tiger stripes on the samples, the influence of the glue feeding method on the unstable flow of polymers can be studied, thereby studying the formation mechanism of tiger stripes.

[0038] As a specific implementation of this embodiment, there are multiple pressure sensors D, and the imaginary connecting line of the multiple pressure sensors D is a U-shape with the same shape as the U-shaped cavity 31. The center lines of the two coincide to ensure the detection accuracy of the pressure sensor D, thereby ensuring the uniformity of the molding pressure and thus ensuring the accuracy of the research.

[0039] Furthermore, a flow-disturbing element 35 may be detachably connected to the cavity 31 , and the flow-disturbing element 35 includes a flow-disturbing rod for disturbing the flow state of the polymer;

[0040] Specifically, the cavity 31 is provided with a mounting groove, the spoiler element 35 includes a mounting portion adapted to the mounting groove, the spoiler rod is provided on the mounting portion, and the spoiler rod is arranged in the cavity 31. When the mounting portion is installed in the mounting groove, the side of the mounting portion provided with the spoiler rod is flush with the mounting side of the cavity 31.

[0041] The provision of the flow-disrupting element 35 can change the flow field of the polymer melt; by preparing multiple samples with the size or shape of the flow-disrupting rod or its position on the mounting portion as a single variable, the formation of tiger stripes on the samples can be used to study the effect of the size, shape, and form of the flow-disrupting portion on the unstable flow of the polymer, thereby studying the formation mechanism of tiger stripes;

[0042] In some embodiments, as Figure 2 As shown, the spoiler rods of the spoiler element 35 are arranged in a plurality at intervals, and the length direction of the spoiler rods is parallel to the straight section of the U-shaped cavity 31 .

[0043] In actual use, when there is no need to study the influence of the flow-disrupting element 35 on the unstable flow of the polymer, the flow-disrupting element 35 can be removed and a covering member flush with the cavity 31 can be installed at the installation groove.

[0044] In this embodiment, a cover plate 4 for cooperating with the mold core 3 is connected to the second mold plate 2;

[0045] The detection end of the first temperature sensor A is connected to the mold core 3, and the detection end of the second temperature sensor B is connected to the cover plate 4; the temperature control component C on the first template 1 extends to the mold core 3, and the temperature control component C on the second template 2 extends to the cover plate 4. This can achieve precise temperature control of the mold core 3 and the cover plate 4, thereby improving research accuracy;

[0046] Specifically, the mold core 3 and the cover plate 4 have the same shape, both are rectangular, and the first temperature sensor A and the second temperature sensor B are staggered; and there are four first temperature sensors A and second temperature sensors B, each of which is arranged close to the corners of the rectangle to ensure the accuracy of temperature detection.

[0047] Furthermore, the mold core 3 is detachably connected to the first template 1;

[0048] Specifically, the first template 1 is provided with a first mounting recess and a first locking assembly 5. The mold core 3 is installed in the first mounting recess and is detachably connected to the first template 1 by the first locking assembly 5. The first locking assembly 5 includes a locking block. The first template 1 is provided with a second mounting recess. The first mounting recess and the second mounting recess are in conductive communication with each other. The locking block is installed in the second mounting recess and is locked by a screw. The locking block is used to press the mold core 3 against the first mounting recess. There are at least two first locking assemblies 5, which are respectively provided on two adjacent sides of the mold core 3.

[0049] The second template 2 has the same structure as the first template 1. The cover plate 4 is detachably connected to the first template 1 through the second locking assembly 6. The second locking assembly 6 has the same structure as the first locking assembly 5, which will not be described in detail in this embodiment.

[0050] The thickness of cavity 31 affects the shear rate of the molten plastic. By changing the thickness of cavity 31 by replacing different mold cores 3, the effect of the thickness of cavity 31 on the unstable flow of the polymer can be studied. Specifically, multiple samples are prepared with the thickness of cavity 31 in mold core 3 as a single variable. By observing the formation of tiger stripes in multiple samples, the effect of the thickness of cavity 31 on the unstable flow of the polymer, that is, the effect of shear rate on the unstable flow of the polymer, can be studied.

[0051] The temperature control component C is a temperature control pipe component, which is provided with an inlet end, an outlet end, an inlet section detachably connected to the inlet end, and an outlet section detachably connected to the outlet end; the first template 1 and the second template 2 are both provided with channels for the inlet section and the outlet section to pass through; in actual application, the mold core 3 is first fixed on the first template 1, and then the inlet section of the temperature control component C is connected to the inlet end through the channel, and the outlet section of the temperature control component C is connected to the outlet end through the channel; similarly, the cover plate 4 is first fixed on the second template 2, and then the inlet section of the temperature control component C is connected to the inlet end through the channel, and the outlet section of the temperature control component C is connected to the outlet end through the channel.

[0052] The temperature control component C realizes temperature control through gaseous or liquid media, which is not limited in this embodiment.

[0053] In this embodiment, the mold body 10 further includes a lower mold base connected to the first mold plate 1 and an upper mold base connected to the second mold plate 2; it also includes an ejector mechanism, a nozzle connected to the runner 32, and other structures. The nozzle passes through the upper mold base and the cover plate 4 and is connected to the runner 32; the ejector of the ejector mechanism is connected to the cavity 31 and is used to eject the sample after the mold is opened;

[0054] A reference ruler is also provided on one side of the cover plate 4 that cooperates with the cavity 31. The reference ruler has the same shape as the cavity 31. The reference ruler is replicated on the manufactured sample to facilitate comparative observation of the tiger stripes of multiple samples.

[0055] In summary, the mold described in this embodiment can be used to study the temperature relationship between the first template 1 and the second template 2, the force field changes in the vertical direction, the force field changes in the horizontal direction, the shape and size of the gate, the glue injection method, the spoiler element 35, and the thickness of the cavity 31 on the unstable flow of the polymer, so as to study the formation mechanism of tiger stripes.

[0056] refer to Figure 5 As shown, this embodiment also provides an injection molding system, including the mold as described above, the mold is set on an injection molding machine, and the first temperature sensor A, the second temperature sensor B, and the temperature control component C are connected to the temperature control module; the injection molding system is used to prepare samples to study the unstable flow factors of polymers;

[0057] The temperature control module 20 includes a control host 21 and a rapid cooling and heating mold temperature component, the rapid cooling and heating mold temperature component includes a rapid cooling and heating mold temperature machine 22, the rapid cooling and heating mold temperature machine 22 includes a heat medium pipe, a refrigerant pipe and an air recovery pipe; the temperature control component C is a temperature control pipe; the temperature control component C in the first template 1 and the second template 2 can be selectively connected to the heat medium pipe, the refrigerant pipe and the air recovery pipe; the first temperature sensor A, the second temperature sensor B, and the rapid cooling and heating mold temperature machine 22 are all electrically connected to the control host 21.

[0058] Specifically, the rapid cooling and heating mold temperature controller 22 is connected to the temperature control component C of the first template 1 or the temperature control component C of the second template 2 at a time. The temperature control components C in the first template 1 and the second template 2 are selectively connected to the heat medium pipeline, the refrigerant pipeline and the air recovery pipeline through a reversing valve. The reversing valve is electrically connected to the control host 21. The rapid cooling and heating mold temperature controller 22 is a prior art. At the same time, achieving selective connection through a reversing valve is also a conventional technical means well known to those skilled in the art, and this embodiment will not go into too much detail on this.

[0059] The rapid cooling and heating mold temperature assembly also includes an air compressor and a water storage tank connected to the rapid cooling and heating mold temperature controller 22. The water storage tank is connected to a water softener and a water chiller, and the water softener is connected to a water tower. The air compressor is used to provide gas, which is input into the temperature control component C via an air blow recovery pipe. The water tower is used to provide water, which is processed by the water softener and then input into the water storage tank. The water chiller is used to prepare the water in the water storage tank into cold water, which is input into the temperature control component C via a refrigerant pipe. The rapid cooling and heating mold temperature controller is equipped with a component for preparing high-temperature steam or high-temperature water, which is input into the temperature control component C via a heat medium pipe. The water storage tank can also be used to recover water remaining inside the temperature control component C in the mold. Among them, the rapid cooling and heating mold temperature controller 22 works by using high-temperature steam or high-temperature water. After the injection molding machine closes the mold, high-temperature steam or high-temperature water is blown into the pipe of the temperature control component C to increase the mold temperature to a set value. Then the injection molding machine starts to inject polymer sol into the cavity 31. After the injection molding machine completes the pressure holding and turns to cooling, it starts to inject cold water into the temperature control component C. After the mold temperature quickly drops to a set value, the mold is opened, and air is blown into the temperature control component C to completely blow away the cold water, completing the entire injection molding process.

[0060] The setting of the rapid cooling and heating mold temperature controller 22 can quickly increase and decrease the temperature of the mold, which is helpful for studying the equilibrium state of the polymer sol during the injection molding process.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A mold, comprising a body (10), wherein the body (10) comprises a first template (1) and a second template (2), wherein the first template (1) is provided with a mold core (3), wherein the mold core (3) is provided with a mold cavity (31) and a flow channel (32), wherein the flow channel (32) is connected to the mold cavity (31), and wherein: The first template (1) is provided with a first temperature sensor (A), and the second template (2) is provided with a second temperature sensor (B); the first template (1) and the second template (2) are both provided with a temperature control component (C), and the first temperature sensor (A), the second temperature sensor (B), and the temperature control component (C) are used to connect to an external temperature control module; the mold core (3) is detachably connected with a gate insert (33), and the gate insert (33) is provided with a gate runner (a), one end of the gate runner (a) is connected to the runner, and the other end is a gate end, and the gate end is connected to the input end of the cavity (31). The mold cavity (31) is a U-shaped structure, and both ends thereof are input ends; the gate inserts (33) are two respectively matched with the two input ends of the mold cavity (31); the runner (32) includes a main channel (321) and two branch channels (322) connected to the main channel (321), and the two branch channels (322) are respectively connected to the gate runners (a) of the two gate inserts (33); the mold core (3) is further provided with a throttle valve (34) matched with the branch channel (322), and the number of the throttle valves (34) is equal to the number of the branch channels (322) and corresponds one to one.

2. The mold according to claim 1, characterized in that A pressure sensor (D) for detecting molding pressure is also connected to the mold cavity (31).

3. The mold according to claim 1, characterized in that A flow-disturbing element (35) is detachably connected to the cavity (31), and the flow-disturbing element (35) comprises a flow-disturbing rod for disturbing the flow state of the polymer.

4. The mold according to claim 1, characterized in that The second template (2) is connected to a cover plate (4) for cooperating with the mold core (3); The detection end of the first temperature sensor (A) is connected to the mold core (3), and the detection end of the second temperature sensor (B) is connected to the cover plate (4); The temperature control component (C) on the first template (1) extends to the mold core (3), and the temperature control component (C) on the second template (2) extends to the cover plate (4).

5. The mold according to claim 4, characterized in that The mold core (3) is connected to the first template (1) in a detachable manner.

6. An injection molding system, characterized in that: It includes an injection molding machine and a temperature control module (20); it also includes a mold as described in any one of claims 1 to 5, the mold is arranged on the injection molding machine, and the first temperature sensor (A), the second temperature sensor (B), and the temperature control component (C) are connected to the temperature control module (20).

7. The injection molding system according to claim 6, characterized in that The temperature control module (20) includes a control host (21) and a rapid cooling and heating mold temperature component, the rapid cooling and heating mold temperature component includes a rapid cooling and heating mold temperature controller (22), and the rapid cooling and heating mold temperature controller (22) includes a heat medium pipeline, a refrigerant pipeline and an air blowing recovery pipeline; the temperature control component (C) is a temperature control pipeline; the temperature control component (C) in the first template (1) and the second template (2) can be selectively connected to the heat medium pipeline, the refrigerant pipeline and the air blowing recovery pipeline; the first temperature sensor (A), the second temperature sensor (B) and the rapid cooling and heating mold temperature controller (22) are all electrically connected to the control host (21).

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