Injection Mold Facilitating Demolding and Its Working Method

Abstract

The present invention belongs to the technical field of plastic molding, specifically relates to an injection mold, and particularly relates to an injection mold facilitating demolding and its working method. Among them, the injection mold facilitating demolding installs a switching component between the water outlet pipe and the water inlet pipe of the liquid cooling pipeline, dividing the cooling of the external cooling source and the injection molded part into two stages. During the filling stage, an internal circulation is carried out to preliminarily cool the mold body with the remaining coolant. After the filling is completed, an external circulation is carried out to secondarily cool the mold body through the external cooling source. The mold body is preliminarily cooled with the relatively high-temperature remaining coolant, reducing the temperature difference between the injection molded part and the coolant, thereby reducing the risk of scale formation and effectively reducing the temperature of the injection molded part. Then, secondary cooling is carried out through the external cooling source, thereby reducing the temperature difference between the external coolant and the injection molded part to be cooled, and further avoiding the problem of increased scale caused by too large a temperature difference between the coolant and the injection molded part.

Description

Technical Field

[0001] The present invention belongs to the technical field of plastic molding, specifically relates to an injection mold, and particularly relates to an injection mold facilitating demolding and its working method. Background Art

[0002] Injection molding is a manufacturing process in which thermoplastic or thermosetting plastics are heated to a flowing state and then injected into a mold cavity under high pressure for molding.

[0003] In the related art, when using an injection mold, in order to accelerate the cooling of the injection molded part, a liquid cooling pipeline is generally arranged in the injection mold for cooling. However, a large amount of water scale will be deposited in the liquid cooling pipeline during long-term use, resulting in a significant reduction in the thermal conductivity of the liquid cooling pipeline, and further affecting the cooling efficiency of the injection molded part.

[0004] Therefore, how to reduce the deposition of water scale in the injection mold is a technical problem to be solved urgently at present.

[0005] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of this application. Therefore, the above description is not considered as information of the prior art. Summary of the Invention

[0006] The embodiments of the present disclosure at least provide an injection mold facilitating demolding and its working method.

[0007] In a first aspect, the embodiments of the present disclosure provide an injection mold facilitating demolding, including:

[0008] A mold body;

[0009] A liquid cooling pipeline, which is embedded in the mold body;

[0010] Wherein, a switching component is arranged between the water inlet pipe and the water outlet pipe of the liquid cooling pipeline;

[0011] During filling, the switching component connects the water inlet pipe and the water outlet pipe of the liquid cooling pipeline to form an internal circulation; after the filling is completed, the switching component connects the water inlet pipe and the water outlet pipe of the liquid cooling pipeline to an external cooling source to form an external circulation.

[0012] In an optional implementation manner, the switching component includes:

[0013] A communicating pipe, with a first connector and a second connector respectively arranged at both ends thereof;

[0014] The first connector is connected to the water inlet pipe;

[0015] The second connector is connected to the water outlet pipe;

[0016] During filling, the first connector connects the connecting pipe with the water inlet pipe, and the second connector connects the connecting pipe with the water outlet pipe; after filling is completed, the first connector connects the water inlet pipe with an external cooling source, and the second connector connects the water outlet pipe with an external cooling source.

[0017] In an optional embodiment, the first connector includes:

[0018] A first sleeve, one end of which is sleeved on the water inlet of the water inlet pipe, and the other end of which extends outward to form a connecting portion for communicating with an external cooling source;

[0019] A first through hole is formed on a side wall of the first sleeve close to the connecting pipe;

[0020] The wall of the water inlet pipe is provided with a second through hole;

[0021] When the first sleeve is pushed by external force, the first through hole and the second through hole are overlapped or staggered. When the first through hole and the second through hole overlap, the water inlet pipe is connected with the water flow channel of the connecting pipe through the first sleeve. When the first through hole and the second through hole are staggered, the water flow channel between the water inlet pipe and the connecting pipe is closed.

[0022] In an optional embodiment, a first filter plate is disposed in the first connector;

[0023] A second filter plate is provided at the water inlet of the water inlet pipe;

[0024] The filter holes of the first filter plate and the second filter plate are arranged in a staggered manner;

[0025] When the first sleeve is pushed by external force, the first filter plate and the second filter plate are overlapped or opened, and when the first filter plate and the second filter plate are overlapped, the water flow channel between the water inlet pipe and the external cooling source is closed, and when the first filter plate and the second filter plate are opened, the water inlet pipe and the water flow channel of the external cooling source are connected.

[0026] In an optional embodiment, the first sleeve extends axially inwardly toward one end of the water inlet pipe to form a first plug end;

[0027] The first plug-in end is inserted into the water inlet pipe, and the first plug-in end is sleeved with a first sealing ring;

[0028] A limiting ring is extended radially inward from the water outlet of the water inlet pipe and is used to limit the first sealing ring sleeved on the first plug-in end inserted into the water inlet pipe.

[0029] In an alternative embodiment, during filling, the coolant remaining in the inner loop is the coolant that remained in the liquid cooling pipeline after the previous injection molding, and its temperature is T1, which preliminarily cools the mold body;

[0030] After the filling is completed, the coolant in the outer loop is provided by an external cooling source, and its temperature is T2, which performs secondary cooling on the mold body;

[0031] Wherein, T1 > T2, and the units of T1 and T2 are °C.

[0032] In a second aspect, an injection mold facilitating demolding provided by an embodiment of the present disclosure includes:

[0033] A mold body;

[0034] A liquid cooling pipeline, which is embedded in the mold body;

[0035] Wherein, a switching component is arranged between the water inlet pipe and the water outlet pipe of the liquid cooling pipeline;

[0036] The liquid cooling pipeline includes an inner loop for cooling at a temperature of T1 and an outer loop for cooling at a temperature of T2;

[0037] Wherein, T1 > T2, and the units of T1 and T2 are °C.

[0038] In an alternative embodiment, the switching component includes:

[0039] A connecting pipe, with a first connector and a second connector respectively arranged at both ends;

[0040] The first connector is connected to the water inlet pipe;

[0041] The second connector is connected to the water outlet pipe;

[0042] During filling, the first connector connects the connecting pipe with the water inlet pipe, and the second connector connects the connecting pipe with the water outlet pipe, so that the liquid cooling pipeline enters the inner loop;

[0043] After the filling is completed, the first connector connects the water inlet pipe with the external cooling source, and the second connector connects the water outlet pipe with the external cooling source, so that the liquid cooling pipeline enters the outer loop.

[0044] In a third aspect, an embodiment of the present disclosure also provides a working method applied to the injection mold facilitating demolding as described above, and the working method includes:

[0045] Before filling, control the switching component to connect the water inlet pipe and the water outlet pipe, and at this time, the temperature of the coolant is T1;

[0046] Cool the mold body initially at temperature T1;

[0047] After filling, control the switching component to connect the water inlet pipe and the water outlet pipe to an external cooling source. At this time, the temperature of the coolant is T2;

[0048] Cool the mold body secondly at temperature T2, and T2 is less than T1.

[0049] In an alternative embodiment, the switching component includes:

[0050] A connecting pipe, with a first connector and a second connector respectively arranged at both ends;

[0051] The first connector is connected to the water inlet pipe;

[0052] The second connector is connected to the water outlet pipe;

[0053] During filling, the first connector connects the connecting pipe to the water inlet pipe, and the second connector connects the connecting pipe to the water outlet pipe; after filling, the first connector connects the water inlet pipe to the external cooling source, and the second connector connects the water outlet pipe to the external cooling source.

[0054] The beneficial effect of the present invention is that this injection mold facilitating demolding and its working method install a switching component between the water outlet pipe and the water inlet pipe of the liquid cooling pipeline, dividing the cooling of the external cooling source and the injection molded part into two stages. During the filling stage, an internal circulation is carried out to initially cool the mold body with the remaining coolant. After filling, an external circulation is carried out to secondly cool the mold body through the external cooling source. Initially cooling with the remaining coolant at a relatively high temperature reduces the temperature difference between the injection molded part and the coolant, thereby reducing the formation of scale and simultaneously reducing the temperature of the injection molded part. Then, secondly cooling is carried out through the external cooling source, thereby reducing the temperature difference between the external coolant and the injection molded part to be cooled, and further avoiding the problem of increased scale caused by too large a temperature difference between the coolant and the injection molded part.

[0055] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification or will be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structures specifically pointed out in the specification and the drawings.

[0056] To make the above objectives, features, and advantages of the present invention more obvious and understandable, specific preferred embodiments are hereby given and, in conjunction with the accompanying drawings, are described in detail as follows. Description of the Drawings

[0057] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0058] Figure 1 A perspective view of the injection mold provided by the embodiment of the present disclosure, which is easy to demold;

[0059] Figure 2 A schematic structural view of the injection mold provided by the embodiment of the present disclosure, which is easy to demold, with the upper mold hidden;

[0060] Figure 3 A schematic structural view of the injection mold provided by the embodiment of the present disclosure, which is easy to demold, with the upper mold and the upper mold core hidden;

[0061] Figure 4 A cross-sectional view of the injection mold provided by the embodiment of the present disclosure, which is easy to demold;

[0062] Figure 5 A schematic view of the switching component provided by the embodiment of the present disclosure when connecting the water inlet pipe and the water outlet pipe of the liquid cooling pipeline to an external cooling source;

[0063] Figure 6 A schematic view of the switching component provided by the embodiment of the present disclosure when connecting the water inlet pipe and the water outlet pipe of the liquid cooling pipeline;

[0064] Figure 7 A flowchart of the working method of the injection mold provided by the embodiment of the present disclosure, which is easy to demold.

[0065] In the figure: 100, mold body; 110, upper mold core; 120, lower mold core; 130, injection port; 200, liquid cooling pipeline; 210, water inlet pipe; 211, second through hole; 212, limiting ring; 220, water outlet pipe; 300, switching component; 310, connecting pipe; 320, first connector; 321, first sleeve; 3211, connecting part; 3212, first insertion end; 3213, first sealing ring; 322, first through hole; 323, first filter plate; 324, second filter plate; 330, second connector; 400, injection molded part. Specific Embodiments

[0066] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0067] It has been found through research that in the related art, the coolant in the liquid cooling pipeline is drained when the mold is opened, so as to avoid the situation that when injecting plastic next time, the overcooled coolant will affect the quality of the injection molded part during filling. However, after the injection mold is filled with material, the coolant is directly introduced into the liquid cooling pipeline for cooling. At this time, the temperature difference between the injection molded part and the coolant is too large, resulting in an increase in scale in the coolant.

[0068] Based on the above research, the embodiments of the present disclosure provide an injection mold that is convenient for demolding and its working method. By setting a switching component to switch the liquid cooling pipeline between internal circulation and external circulation, the temperature difference between the injection molded part and the coolant is reduced, and thus the scale content in the coolant is reduced.

[0069] Regarding the defects existing in the above solutions, they are all the results obtained by the inventor through practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present disclosure in this article for the above problems should all be the contributions made by the inventor to the present disclosure during the process of the present disclosure.

[0070] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0071] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0072] Please refer to Figure 1 , at least one embodiment provides an injection mold that is convenient for demolding, including the following structures:

[0073] A mold body 100, in which an upper mold core 110 and a lower mold core 120 are arranged. As Figure 2 shown, among them, the materials of the upper mold core 110 and the lower mold core 120 are usually made of materials with high hardness and good wear resistance.

[0074] A liquid cooling pipeline 200, which is embedded in the mold body 100, as Figure 3 shown.

[0075] In an alternative embodiment, the liquid cooling pipeline 200 is provided in the upper mold core 110 and / or the lower mold core 120.

[0076] Wherein, a switching component 300 is provided between the water inlet pipe 210 and the water outlet pipe 220 of the liquid cooling pipeline 200. By installing the switching component 300 between the water outlet pipe 220 and the water inlet pipe 210 of the liquid cooling pipeline 200, the cooling of the external cooling source and the injection molded part 400 is divided into two stages. During the filling stage, an internal circulation is carried out to preliminarily cool the mold body 100 with the remaining coolant. After the filling is completed, an external circulation is carried out to perform secondary cooling of the mold body 100 through the external cooling source.

[0077] During filling, the switching component 300 connects the water inlet pipe 210 and the water outlet pipe 220 of the liquid cooling pipeline 200 to form an internal circulation; after the filling is completed, the switching component 300 connects the water inlet pipe 210 and the water outlet pipe 220 of the liquid cooling pipeline 200 to the external cooling source to form an external circulation.

[0078] Preliminary cooling is carried out with the remaining coolant at a higher temperature to reduce the temperature difference between the injection molded part 400 and the coolant, thereby reducing the formation of scale. At the same time, the temperature of the injection molded part 400 is reduced, and then secondary cooling is carried out through the external cooling source, thereby reducing the temperature difference between the external coolant and the injection molded part 400 to be cooled, and further avoiding the problem of increased scale caused by too large a temperature difference between the coolant and the injection molded part 400.

[0079] Please refer to Figure 4 , the switching component 300 includes: a connecting pipe 310, with a first connector 320 and a second connector 330 respectively provided at both ends.

[0080] Wherein, the first connector 320 is connected to the water inlet pipe 210, and the second connector 330 is connected to the water outlet pipe 220.

[0081] During filling, the first connector 320 connects the connecting pipe 310 to the water inlet pipe 210, and the second connector 330 connects the connecting pipe 310 to the water outlet pipe 220. As Figure 6 shown, at this time, the temperature of the coolant in the liquid cooling pipeline 200 near the injection port 130 is relatively high, and the temperature of the coolant in the liquid cooling pipeline 200 near the water outlet pipe 220 and the water inlet pipe 210 is relatively low. At this time, the coolant forms convection under the action of the temperature difference, and the flow direction of the coolant in the liquid cooling pipeline 200 is as Figure 6 shown by F3 and F4 in.

[0082] After filling, the first connector 320 connects the water inlet pipe 210 to an external cooling source, and the second connector 330 connects the water outlet pipe 220 to an external cooling source. As Figure 5 shown, the flow direction of the coolant in the liquid cooling pipeline 200 at this time is as shown by F1 and F2 in Figure 5 .

[0083] It should be noted that during filling, the coolant in the internal circulation is the coolant remaining in the liquid cooling pipeline 200 after the previous injection molding, and its temperature is T1, which preliminarily cools the mold body 100; after filling, the coolant in the external circulation is an external cooling source, and its temperature is T2, which performs secondary cooling on the mold body 100; where T1 > T2, and the units of T1 and T2 are °C.

[0084] Among them, the ranges of T1 and T2 are set according to the temperature of the injection molding material. For example, in a certain injection molding process, the range of T1 is 70 - 85 °C, and the range of T2 is 40 - 60 °C. Specifically, during the production of a certain injection molded part, T1 is 70 °C, T2 is 40 °C, the preliminary cooling time is 5 seconds, and the secondary cooling time is 60 seconds. Or, during the production of a certain injection molded part, T1 is 85 °C, T2 is 60 °C, the preliminary cooling time is 15 seconds, and the secondary cooling time is 120 seconds.

[0085] Among them, during the internal circulation, the temperature T1 of the coolant gradually increases with the injection of the raw material during filling, further reducing the temperature difference between the coolant and the raw material, thereby reducing the generation of scale.

[0086] It should be noted that the structure of the second connector 330 is similar to that of the first connector 320. In this embodiment, only the structure of the first connector 320 will be described in detail, and the structure of the second connector 330 will not be elaborated.

[0087] Please refer to Figure 5 and Figure 6 , the first connector 320 includes: a first sleeve 321, one end of which is sleeved at the water inlet of the water inlet pipe 210, and the other end extends outward to form a connection portion 3211 for communicating with an external cooling source.

[0088] Among them, a first through hole 322 is opened on the side wall of the first sleeve 321 close to the communication pipe 310; a second through hole 211 is opened on the pipe wall of the water inlet pipe 210.

[0089] When the first sleeve is pushed by an external force, the first through hole 322 coincides with or is offset from the second through hole 211. When the first through hole 322 coincides with the second through hole 211, the water inlet pipe 210 is communicated with the water flow channel of the communication pipe 310 through the first sleeve 321. When the first through hole 322 is offset from the second through hole 211, the water flow channel between the water inlet pipe 210 and the communication pipe 310 is closed.

[0090] Specifically, during filling, the communication pipe is pushed to make the first through hole 322 of the first sleeve 321 coincide with the second through hole 211, so that the liquid cooling pipeline 200 enters the internal circulation. After the filling is completed, the communication pipe 310 is pulled to offset the first through hole 322 of the first sleeve 321 from the second through hole 211.

[0091] Among them, the communication pipe can be manually pulled by hand. In other embodiments, it can be controlled by an electric drive method such as a servo motor.

[0092] Please continue to refer to Figure 5 and Figure 6 At the same time, in order to ensure that when the communication pipe connects the water inlet pipe 210 and the water outlet pipe 220, the water inlet pipe 210 and the water outlet pipe 220 are not connected to the external cooling source.

[0093] In a preferred embodiment, a first filter plate 323 is provided inside the first connector 320; a second filter plate 324 is provided at the water inlet of the water inlet pipe 210.

[0094] Among them, the filter holes of the first filter plate 323 and the second filter plate 324 are staggered. By providing the first filter plate 323 and the second filter plate 324 to filter the sediment generated in the liquid cooling pipeline 200, it is avoided that the sediment enters the external cooling source. After the switching component 300 is disassembled regularly, the first filter plate 323 and the second filter plate 324 can be cleaned.

[0095] When the first sleeve is pushed by an external force, the first filter plate 323 coincides with or opens with the second filter plate 324. And when the first filter plate 323 coincides with the second filter plate 324, the water flow channel between the water inlet pipe 210 and the external cooling source is closed. When the first filter plate 323 and the second filter plate 324 are opened, the water flow channel between the water inlet pipe 210 and the external cooling source is communicated.

[0096] When the communication pipe is pushed to make the first through hole 322 of the first sleeve 321 coincide with the second through hole 211, the first filter plate 323 coincides with the second filter plate 324 synchronously, so as to ensure that while the water inlet pipe 210 and the water outlet pipe 220 are connected through the communication pipe 310, the water inlet pipe 210 and the water outlet pipe 220 are disconnected from the external cooling source.

[0097] It should be noted that even if there is a gap between the first filter plate 323 and the second filter plate 324, only a small amount of coolant will flow from the external cooling source, which will not cause too much interference to the temperature of the coolant in the liquid cooling pipeline 200. At the same time, it will increase the fluidity of the cooling source in the liquid cooling pipeline 200 at this time.

[0098] Please refer to Figure 5 and Figure 6 , in order to ensure the sealing performance between the first sleeve 321 and the water inlet pipe 210.

[0099] In a preferred embodiment, one end of the first sleeve 321 facing the water inlet pipe 210 extends axially inward to form a first insertion end 3212; the first insertion end 3212 is inserted into the water inlet pipe 210, and a first sealing ring 3213 is sleeved on the first insertion end 3212; a limiting ring 212 extends radially inward from the water outlet of the water inlet pipe 210, and is used to limit the first sealing ring 3213 sleeved on the first insertion end 3212 inserted into the water inlet pipe 210.

[0100] At the same time, in order to prevent the first sealing ring 3213 from being in a compressed state for a long time, each time the communication pipe is pushed, it will drive the first sealing ring 3213 to move synchronously, thereby relieving the pressure on the first sealing ring 3213.

[0101] Please refer to Figure 1 , Figure 2 and Figure 3 , at least one embodiment also provides an injection mold that is easy to demold, including the following structures:

[0102] A mold body 100, in which an upper mold core 110 and a lower mold core 120 are arranged. Among them, the materials of the upper mold core 110 and the lower mold core 120 are usually made of materials with high hardness and good wear resistance.

[0103] A liquid cooling pipeline 200, which is embedded in the mold body 100.

[0104] In an alternative embodiment, the liquid cooling pipeline 200 is arranged in the upper mold core 110 and / or the lower mold core 120.

[0105] Among them, a switching component 300 is arranged between the water inlet pipe 210 and the water outlet pipe 220 of the liquid cooling pipeline 200; the liquid cooling pipeline 200 includes an internal circulation cooled at a temperature of T1 and an external circulation cooled at a temperature of T2; where T1 > T2, and the units of T1 and T2 are °C.

[0106] Among them, the internal circulation means that the coolant circulates in the liquid cooling pipeline 200 without heat exchange with an external cooling source. The external circulation means that the coolant circulates between the liquid cooling pipeline 200 and the cooling source.

[0107] Please refer to Figure 4 and Figure 5 , the switching component 300 includes: a connecting pipe 310, with a first connector 320 and a second connector 330 respectively arranged at both ends thereof.

[0108] Among them, the first connector 320 is connected to the water inlet pipe 210, and the second connector 330 is connected to the water outlet pipe 220.

[0109] During filling, the first connector 320 connects the connecting pipe 310 with the water inlet pipe 210, and the second connector 330 connects the connecting pipe 310 with the water outlet pipe 220, enabling the liquid cooling pipeline 200 to enter the internal circulation. As Figure 6 shown, at this time, the temperature of the coolant near the injection port 130 of the liquid cooling pipeline 200 is relatively high, and the temperature of the coolant near the water outlet pipe 220 and the water inlet pipe 210 of the liquid cooling pipeline 200 is relatively low. At this time, the coolant forms convection under the action of the temperature difference, and the flow direction of the coolant in the liquid cooling pipeline 200 is as Figure 6 shown by F3 and F4 in

[0110] After the filling is completed, the first connector 320 connects the water inlet pipe 210 with the external cooling source, and the second connector 330 connects the water outlet pipe 220 with the external cooling source, enabling the liquid cooling pipeline 200 to enter the external circulation. As Figure 4 shown, at this time, the flow direction of the coolant in the liquid cooling pipeline 200 is as Figure 5 shown by F1 and F2 in

[0111] It should be noted that during filling, the coolant in the internal circulation is the coolant remaining in the liquid cooling pipeline 200 after the previous injection molding, and its temperature is T1, which preliminarily cools the mold body 100; after the filling is completed, the coolant in the external circulation is the external cooling source, and its temperature is T2, which secondarily cools the mold body 100; among them, T1 > T2, and the units of T1 and T2 are °C.

[0112] Among them, during the internal circulation, the temperature T1 of the coolant will gradually increase with the injection of the raw material during filling, further reducing the temperature difference between the coolant and the raw material, thereby reducing the generation of scale.

[0113] Please refer to Figure 7 , at least one embodiment further provides a working method applied to the injection mold for facilitating demolding as described above. The working method includes:

[0114] Step S1, before filling, control the switching component 300 to connect the water inlet pipe 210 and the water outlet pipe 220. At this time, the temperature of the coolant is T1.

[0115] Step S2, preliminarily cool the mold body 100 at the temperature of T1.

[0116] Step S3, after filling is completed, control the switching component 300 to connect the water inlet pipe 210 and the water outlet pipe 220 to an external cooling source. At this time, the temperature of the coolant is T2.

[0117] Step S4, perform secondary cooling on the mold body 100 at the temperature of T2, and T2 is less than T1.

[0118] Please refer to Figure 5 and Figure 6 , the switching component 300 includes: a connecting pipe 310, with a first connector 320 and a second connector 330 respectively arranged at both ends thereof; the first connector 320 is connected to the water inlet pipe 210; the second connector 330 is connected to the water outlet pipe 220.

[0119] During filling, the first connector 320 connects the connecting pipe 310 and the water inlet pipe 210, and the second connector 330 connects the connecting pipe 310 and the water outlet pipe 220; after filling is completed, the first connector 320 connects the water inlet pipe 210 to an external cooling source, and the second connector 330 connects the water outlet pipe 220 to an external cooling source.

[0120] Example 1, injection-mold the injection-molded part according to the working method of the injection mold for facilitating demolding provided by the present application. T1 is 70 °C, T2 is 40 °C, the preliminary cooling time is 5 seconds, and the secondary cooling time is 60 seconds. After 500 injections, the total precipitation amount is measured to be 0.51 mg / cm 2 , and the cooling efficiency decay percentage is 4.8%.

[0121] Comparative Example 1, injection-mold the injection-molded part according to the conventional process. The filling time is 5 seconds, the cooling time is 60 seconds, the coolant temperature is 40 °C, and after each injection is completed, the liquid in the injection mold is emptied. After 500 injections, the total precipitation amount is measured to be 2.15 mg / cm 2 , and the cooling efficiency decay percentage is 22.7%.

[0122] It can be seen from Example 1 and Comparative Example 1 that through two-stage temperature control, the present invention reduces the scale deposition amount after 500 uses to 23.7% of the traditional scheme, and the cooling efficiency decay is much lower than the conventional process.

[0123] In summary, the present invention provides an injection mold that facilitates demolding and its working method. Among them, the injection mold that facilitates demolding installs a switching component 300 between the water outlet pipe 220 and the water inlet pipe 210 of the liquid cooling pipeline 200, dividing the cooling of the external cooling source and the injection molded part 400 into two stages. During the filling stage, an internal circulation is carried out to preliminarily cool the mold body 100 with the remaining coolant. After the filling is completed, an external circulation is carried out to secondarily cool the mold body 100 through the external cooling source. The remaining coolant with a higher temperature is used for preliminary cooling to reduce the temperature difference between the injection molded part 400 and the coolant, thereby reducing the formation of scale and at the same time lowering the temperature of the injection molded part 400. Then, secondary cooling is carried out through the external cooling source, thereby reducing the temperature difference between the external coolant and the injection molded part 400 to be cooled, and further avoiding the problem of increased scale caused by too large a temperature difference between the coolant and the injection molded part 400.

[0124] Inspired by the above ideal embodiments according to the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An injection mold facilitating demolding, characterized in that, include: Mold body (100); A liquid cooling pipeline (200) embedded in the mold body (100); Wherein, a switching component (300) is provided between the water inlet pipe (210) and the water outlet pipe (220) of the liquid cooling pipeline (200); During filling, the switching component (300) connects the water inlet pipe (210) and the water outlet pipe (220) of the liquid cooling pipeline (200) to form an internal circulation; after the filling is completed, the switching component (300) connects the water inlet pipe (210) and the water outlet pipe (220) of the liquid cooling pipeline (200) to an external cooling source to form an external circulation; During filling, the coolant remaining in the internal circulation is the coolant retained in the liquid cooling pipeline (200) after the last injection molding, and its temperature is T1, which performs preliminary cooling on the mold body (100); After the filling is completed, the coolant in the external circulation is provided by an external cooling source, and its temperature is T2, so as to perform secondary cooling on the mold body (100); Wherein, T1>T2, and the unit of T1 and T2 is ℃; The switching component (300) comprises: A connecting pipe (310), with a first connector (320) and a second connector (330) respectively provided at both ends thereof; The first connector (320) is connected to the water inlet pipe (210); The second connector (330) is connected to the water outlet pipe (220); During filling, the first connector (320) connects the connecting pipe (310) with the water inlet pipe (210), and the second connector (330) connects the connecting pipe (310) with the water outlet pipe (220); after filling is completed, the first connector (320) connects the water inlet pipe (210) with an external cooling source, and the second connector (330) connects the water outlet pipe (220) with an external cooling source; The first connector (320) comprises: A first sleeve (321), one end of which is sleeved on the water inlet of the water inlet pipe (210), and the other end of which extends outward to form a connecting portion (3211) for communicating with an external cooling source; A first through hole (322) is formed on a side wall of the first sleeve (321) close to the connecting pipe (310); The wall of the water inlet pipe (210) is provided with a second through hole (211); When the first sleeve (321) is pushed by an external force, the first through hole (322) and the second through hole (211) are overlapped or staggered; Furthermore, when the first through hole (322) and the second through hole (211) overlap, the water inlet pipe (210) is connected to the water flow channel of the connecting pipe (310) through the first sleeve (321); When the first through hole (322) and the second through hole (211) are offset, the water flow channel between the water inlet pipe (210) and the connecting pipe (310) is closed; A first filter plate (323) is arranged in the first connector (320); A second filter plate (324) is provided at the water inlet of the water inlet pipe (210); The filter holes of the first filter plate (323) and the second filter plate (324) are arranged in a staggered manner; When the first sleeve (321) is pushed by an external force, the first filter plate (323) is overlapped with or opened from the second filter plate (324). When the first filter plate (323) is overlapped with the second filter plate (324), the water flow channel between the water inlet pipe (210) and the external cooling source is closed. When the first filter plate (323) is opened from the second filter plate (324), the water flow channel between the water inlet pipe (210) and the external cooling source is communicated; One end of the first sleeve (321) facing the water inlet pipe (210) axially extends inwards to form a first insertion end (3212); The first insertion end (3212) is inserted into the water inlet pipe (210), and a first sealing ring (3213) is sleeved on the first insertion end (3212); A limiting ring (212) extends inwards radially from the water outlet of the water inlet pipe (210), and is used for limiting the first sealing ring (3213) sleeved on the first insertion end (3212) inserted into the water inlet pipe (210).

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