Rapid cooling injection mold and injection molding process

Abstract

The present invention belongs to the field of plastic processing, and specifically provides a fast cooling injection mold, comprising: an upper mold and a lower mold; an upper mold core and a lower mold core are arranged between the upper mold and the lower mold; an upper cooling pipe is built in the upper mold core; a lower cooling pipe is built in the lower mold core; a first liquid pipeline is opened at the side wall of the upper mold opposite to the liquid inlet and liquid outlet of the upper cooling pipe; a second liquid pipeline is opened at the side wall of the lower mold opposite to the liquid inlet and liquid outlet of the lower cooling pipe; the upper cooling pipe and the lower cooling pipe form a liquid cooling cycle with an external cooling source through the corresponding first liquid pipeline and the second liquid pipeline. By adding a cooling pipeline in the mold core, the injection molded part is quickly cooled, thereby avoiding fracture and burrs caused by excessive temperature difference during cooling of the injection molded part, and improving the product qualification rate of the injection molded part.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic processing, and specifically relates to an injection mold, and in particular to a fast-cooling injection mold and an injection molding process. Background Art

[0002] During the transportation process, the chips are transported on plastic pallets, which are generally prepared using an injection molding process.

[0003] After the materials in the related technology are injected into the mold, they need to be cooled, which is divided into two stages. The first stage is natural cooling, in which the materials are naturally cooled in the mold. After the tray is formed, the tray is taken out and the second stage is the rapid cooling stage. The tray is placed in cold water to speed up the cooling speed. The above process has the following problems: First, the cooling cannot be formed in one step, and it needs to be transferred, which increases the production time and space occupied; second, the cooling water needs to be replaced frequently, and the water resource utilization rate is low.

[0004] Therefore, how to improve cooling efficiency and increase the utilization rate of cooling water is currently an urgent problem to be solved.

[0005] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention

[0006] The embodiments of the present disclosure at least provide a fast cooling injection mold and injection molding process.

[0007] In a first aspect, an embodiment of the present disclosure provides a rapid cooling injection mold, comprising:

[0008] Upper die and lower die;

[0009] An upper mold core and a lower mold core are arranged between the upper mold and the lower mold;

[0010] The upper mold core is provided with an upper cooling pipe;

[0011] The lower mold core is provided with a lower cooling pipeline;

[0012] A first liquid pipeline is provided on the side wall of the upper mold at a position opposite to the liquid inlet and the liquid outlet of the upper cooling pipe;

[0013] A second liquid pipeline is provided on the side wall of the lower mold at a position opposite to the liquid inlet and the liquid outlet of the lower cooling pipe;

[0014] The upper cooling pipeline and the lower cooling pipeline form a liquid cooling cycle with an external cooling source through the corresponding first liquid pipeline and the second liquid pipeline.

[0015] In an optional embodiment, the upper cooling channel is composed of a plurality of drilled holes along the width and length directions of the upper mold core.

[0016] In an optional embodiment, the lower cooling duct is composed of a plurality of drilled holes along the width and length directions of the lower mold core.

[0017] In an optional embodiment, the drilled holes among the plurality of drilled holes that are not opposite to the first liquid pipeline and the second liquid pipeline are process holes;

[0018] An elastic component is arranged in the process hole;

[0019] The elastic component is suitable for sealing the process hole.

[0020] In an optional embodiment, the elastic component includes a fixing frame, a return spring and a sliding plug;

[0021] The fixing frame and the sliding plug are respectively fixedly arranged at two ends of the return spring;

[0022] The fixing frame is fixedly arranged in the process hole, and the sliding plug extends into the process hole;

[0023] The sliding plug abuts against the inner wall of the process hole.

[0024] In an optional embodiment, when coolant is introduced into the first liquid pipeline and the second liquid pipeline, the sliding plug is adapted to be compressed under the pressure of the coolant, thereby ensuring uniformity of cooling;

[0025] After the coolant in the first liquid pipeline and the second liquid pipeline is extracted, the sliding plug is suitable for rebounding under the resetting action of the resetting spring to push out the coolant in the process hole to avoid coolant residue in the process hole.

[0026] In an optional embodiment, the side wall of the sliding plug is provided with a flexible cleaning layer;

[0027] The sliding plug is suitable for cleaning the inner wall of the process hole when sliding in the process hole.

[0028] In an optional embodiment, a flow equalizing plate is provided on the top surface of the upper mold core;

[0029] The injection pipe in the upper mold is connected to the flow equalizing plate;

[0030] The flow equalizing plate is connected with the upper mold core through the injection head.

[0031] In an optional embodiment, the rapid cooling injection mold further comprises a slide bar;

[0032] The sliding bar is provided with a sliding groove;

[0033] The sliding bar is arranged on the side walls of the upper mold and the lower mold;

[0034] The upper die and the lower die are connected to the sliding bar via sliding bolts.

[0035] In a second aspect, the present disclosure also provides an injection molding process, the process comprising:

[0036] Close the upper mold and the lower mold;

[0037] Inject the hot melted plastic through the injection pipe of the upper mold;

[0038] After the plastic is injected between the upper mold core and the lower mold core, coolant is introduced into the upper mold core and the lower mold core;

[0039] After waiting for a preset time, the upper mold and the lower mold are opened and the cooled injection molded parts are taken out.

[0040] The beneficial effect of the present invention is that the rapid cooling injection mold and injection molding process quickly cools down the injection molded parts by adding cooling pipes in the mold core, thereby avoiding breakage and burrs caused by excessive temperature differences during cooling of the injection molded parts, thereby improving the product qualification rate of the injection molded parts.

[0041] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, this article specifically cites preferred embodiments and provides detailed descriptions as follows in conjunction with the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A schematic structural diagram of a rapid cooling injection mold provided in an embodiment of the present disclosure.

[0045] Figure 2 A cross-sectional view of a rapid cooling injection mold provided for an embodiment of the present disclosure.

[0046] Figure 3 A schematic diagram of the partial structure of the mold core provided in an embodiment of the present disclosure.

[0047] Figure 4 A cross-sectional view of an upper mold core provided in an embodiment of the present disclosure.

[0048] Figure 5 A cross-sectional view of a lower mold core provided in an embodiment of the present disclosure.

[0049] Figure 6 A schematic diagram of the structure of an elastic component provided in an embodiment of the present disclosure.

[0050] In the figure: 100, upper mold; 110, first liquid pipeline; 200, lower mold; 210, second liquid pipeline; 300, upper mold core; 400, lower mold core; 500, drilling; 510, process hole; 520, elastic component; 521, fixing frame; 522, return spring; 523, sliding plug; 600, flow equalizing plate; 610, injection head; 700, injection pipe; 800, sliding bar; 810, sliding groove; 820, sliding bolt. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." modify the entire list of elements when following a list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0053] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limited. As used herein, the singular articles "one", "an" and "the" may also be intended to include plural forms, unless it is clearly indicated above that this is not the case. The terms "comprise", "include" and "have" are inclusive, and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0054] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, so that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. On the contrary, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0055] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0056] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, in the drawings, the thickness of the components may be exaggerated or reduced in order to effectively describe the technical content.

[0057] See also Figure 1 and Figure 2 , Figure 1 and Figure 2The schematic diagram of the structure of the rapid cooling injection mold is shown, which includes: an upper mold 100 and a lower mold 200; an upper mold core 300 and a lower mold core 400 are arranged between the upper mold 100 and the lower mold 200; the upper mold core 300 is built with an upper cooling pipe; the lower mold core 400 is built with a lower cooling pipe; a first liquid pipeline 110 is opened at the side wall of the upper mold 100 opposite to the liquid inlet and liquid outlet of the upper cooling pipe; a second liquid pipeline 210 is opened at the side wall of the lower mold 200 opposite to the liquid inlet and liquid outlet of the lower cooling pipe; the upper cooling pipe and the lower cooling pipe form a liquid cooling cycle with an external cooling source through the corresponding first liquid pipeline 110 and the second liquid pipeline 210. By adding a cooling pipeline in the mold core, the injection molded part is cooled quickly, thereby avoiding fracture and burrs caused by excessive temperature difference during cooling of the injection molded part, and improving the product qualification rate of the injection molded part.

[0058] Since the mold core is usually made of a material with high hardness and good wear resistance, the cooling channel in the mold core cannot be made in an integrated molding manner.

[0059] See also Figure 3-Figure 5 In some embodiments, the upper cooling duct is formed by a plurality of holes 500 drilled along the width and length of the upper mold core 300. The lower cooling duct is formed by a plurality of holes 500 drilled along the width and length of the lower mold core 400.

[0060] In order to ensure the uniformity of cooling, multiple cooling pipes need to be passed through the upper mold core 300 and the lower mold core 400 horizontally and vertically, thereby generating redundant drill holes 500. Among the multiple drill holes 500, the drill holes 500 that are not opposite to the first liquid pipeline 110 and the second liquid pipeline 210 are process holes 510; an elastic component 520 is disposed in the process hole 510; the elastic component 520 is suitable for blocking the process hole 510. The process hole 510 is blocked by the elastic component 520, thereby avoiding the formation of a pipeline that cannot form a passage, thereby avoiding the residue of coolant in the upper mold core 300 and the lower mold core 400.

[0061] See also Figure 6 Specifically, in a preferred embodiment, the elastic component 520 includes a fixing frame 521, a return spring 522 and a sliding plug 523; the fixing frame 521 and the sliding plug 523 are respectively fixedly arranged at two ends of the return spring 522; the fixing frame 521 is fixedly arranged in the process hole 510, and the sliding plug 523 extends into the process hole 510; the sliding plug 523 is abutted against the inner wall of the process hole 510.

[0062] The working process of the elastic component 520 is described below:

[0063] When the coolant is passed into the first liquid pipeline 110 and the second liquid pipeline 210, the sliding plug 523 is adapted to be compressed under the pressure of the coolant, thereby ensuring the uniformity of cooling;

[0064] After the coolant in the first liquid pipeline 110 and the second liquid pipeline 210 is extracted, the sliding plug 523 is suitable for rebounding under the reset action of the reset spring 522 to push the coolant in the process hole 510 out to avoid coolant residue in the process hole 510.

[0065] By adopting the elastic component 520, the coolant in the process hole can be drained without affecting the uniform distribution of the coolant, thereby avoiding coolant residue and avoiding damaging the cooling uniformity.

[0066] In a preferred embodiment, a flexible cleaning layer is provided on the side wall of the sliding plug 523; the sliding plug 523 is suitable for cleaning the inner wall of the process hole 510 when sliding in the process hole 510. By providing a flexible cleaning layer, the process hole 510 is cleaned, and the cleaned impurities flow out with the coolant in the liquid cooling pipe, thereby reducing the accumulation of impurities in the liquid cooling pipe.

[0067] Please continue reading Figure 3 In some embodiments, in order to ensure that the hot-melt plastic can be evenly and quickly distributed between the upper mold core 300 and the lower mold core 400, a flow equalizing plate 600 is provided on the top surface of the upper mold core 300; the injection pipe 700 in the upper mold 100 is connected to the flow equalizing plate 600; the flow equalizing plate 600 is connected to the upper mold core 300 through the injection head 610.

[0068] It should be noted that when the upper cooling channel is opened, the injection port of the upper mold 100 head needs to be avoided.

[0069] Please continue reading Figure 1 In order to facilitate the rapid mold closing and opening of the upper mold 100 and the lower mold 200, in a preferred embodiment, the rapid cooling injection mold also includes a sliding bar 800; a sliding groove 810 is opened on the sliding bar 800; the sliding bar 800 is arranged on the side walls of the upper mold 100 and the lower mold 200; the upper mold 100 and the lower mold 200 are connected to the sliding bar 800 through a sliding bolt 820.

[0070] At least one embodiment further provides an injection molding process, the process comprising: closing an upper mold and a lower mold; injecting hot melted plastic through an injection pipe of the upper mold; after the plastic is injected between the upper mold core and the lower mold core, passing a coolant into the upper mold core and the lower mold core; after waiting for a preset time, opening the upper mold and the lower mold, and taking out the cooled injection molded part. By adding a cooling pipe in the mold core, the injection molded part is quickly cooled, thereby avoiding fracture and burrs caused by excessive temperature difference during cooling of the injection molded part, and improving the product qualification rate of the injection molded part.

[0071] In summary, the present invention provides a fast cooling injection mold, comprising: an upper mold and a lower mold; an upper mold core and a lower mold core are arranged between the upper mold and the lower mold; an upper cooling pipe is built into the upper mold core; a lower cooling pipe is built into the lower mold core; a first liquid pipeline is opened at the side wall of the upper mold opposite to the liquid inlet and liquid outlet of the upper cooling pipe; a second liquid pipeline is opened at the side wall of the lower mold opposite to the liquid inlet and liquid outlet of the lower cooling pipe; the upper cooling pipe and the lower cooling pipe form a liquid cooling cycle with an external cooling source through the corresponding first liquid pipeline and the second liquid pipeline. By adding a cooling pipeline in the mold core, the injection molded part is quickly cooled, thereby avoiding fracture and burrs caused by excessive temperature difference during cooling of the injection molded part, and improving the product qualification rate of the injection molded part.

[0072] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An injection molding process for an injection mold, characterized in that: include: Close the upper mold and the lower mold; Inject the hot melted plastic through the injection pipe of the upper mold; After the plastic is injected between the upper mold core and the lower mold core, coolant is introduced into the upper mold core and the lower mold core; After waiting for a preset time, the upper mold and the lower mold are opened, and the cooled injection molded parts are taken out; The injection mold comprises: an upper mold and a lower mold; An upper mold core and a lower mold core are arranged between the upper mold and the lower mold; The upper mold core is provided with an upper cooling pipe; The lower mold core is provided with a lower cooling pipeline; A first liquid pipeline is provided on the side wall of the upper mold at a position opposite to the liquid inlet and the liquid outlet of the upper cooling pipe; A second liquid pipeline is provided on the side wall of the lower mold at a position opposite to the liquid inlet and the liquid outlet of the lower cooling pipe; The upper cooling pipeline and the lower cooling pipeline form a liquid cooling cycle with an external cooling source through the corresponding first liquid pipeline and the second liquid pipeline; The upper cooling channel is composed of a plurality of holes drilled along the width and length of the upper die core; The lower cooling channel is composed of a plurality of holes drilled along the width and length of the lower mold core; The drilled holes that are not opposite to the first liquid pipeline and the second liquid pipeline among the plurality of drilled holes are process holes; An elastic component is arranged in the process hole; The elastic component is suitable for blocking the process hole; The elastic component includes a fixing frame, a return spring and a sliding plug; The fixing frame and the sliding plug are respectively fixedly arranged at two ends of the return spring; The fixing frame is fixedly arranged in the process hole, and the sliding plug extends into the process hole; The sliding plug abuts against the inner wall of the process hole; When coolant is introduced into the first liquid pipeline and the second liquid pipeline, the sliding plug is adapted to be compressed under the pressure of the coolant; After the coolant in the first liquid pipeline and the second liquid pipeline is extracted, the sliding plug is adapted to rebound under the resetting action of the resetting spring to push out the coolant in the process hole; The side wall of the sliding plug is provided with a flexible cleaning layer; The sliding plug is suitable for cleaning the inner wall of the process hole through the flexible cleaning layer when sliding in the process hole.

2. The injection molding process of the injection mold according to claim 1, characterized in that: The top surface of the upper mold core is provided with a flow equalizing plate; The injection pipe in the upper mold is connected to the flow equalizing plate; The flow equalizing plate is connected with the upper mold core through the injection head.

3. The injection molding process of the injection mold according to claim 1, characterized in that: The injection mold also includes a slide bar; The sliding bar is provided with a sliding groove; The sliding bar is arranged on the side walls of the upper mold and the lower mold; The upper die and the lower die are connected to the sliding bar via sliding bolts.

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