KR20110139351A - Injection mold die of air cooling system and method for the same - Google Patents

Injection mold die of air cooling system and method for the same Download PDF

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Publication number
KR20110139351A
KR20110139351A KR1020100059374A KR20100059374A KR20110139351A KR 20110139351 A KR20110139351 A KR 20110139351A KR 1020100059374 A KR1020100059374 A KR 1020100059374A KR 20100059374 A KR20100059374 A KR 20100059374A KR 20110139351 A KR20110139351 A KR 20110139351A
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KR
South Korea
Prior art keywords
mold
cooling
injection
air
supply
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KR1020100059374A
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Korean (ko)
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KR101264893B1 (en
Inventor
유영희
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주식회사 유도
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Priority to KR1020100059374A priority Critical patent/KR101264893B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C45/7337—Heating or cooling of the mould using gas or steam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C2045/7387—Heating or cooling of the mould jetting a cooling fluid onto the moulded article while still in the mould

Abstract

PURPOSE: An air cooling system of an injection mold and a method thereof are provided to reduce the cooling time of an injecting mold and save the heat energy by directly providing the cooling air to the cavity surface of an injecting mold and an extrudate. CONSTITUTION: An air cooling system of an injection mold comprises a mold opening unit(130), a cooling air feeding unit(140) and a controller(150). When entering the cooling process after an extrusion process, the mold opening unit divides an upper mold(110) from a lower mold(120) at a constant interval. The cooling air feeding unit injects the cooling air to a gap between the opened upper and lower molds through the mold opening unit. When entering the cooling process, the controller supplies the cooling water in the lower mold and supplies the cooling air by controlling the mold opening unit and the cooling air feeding unit.

Description

Injection Mold Die of Air Cooling System And Method for The Same

The present invention relates to an air cooling system of an injection mold and a method thereof. More specifically, by directly supplying cooling air to the surface of the cavity of the injection mold and the surface of the injection molded product, the direct cooling method using the thermal conductivity of the injection mold increases the cooling efficiency of the injection mold, thereby saving thermal energy and cooling the injection mold. The present invention relates to an air cooling system of an injection mold and a method for improving the productivity of a product by reducing the time.

In general, injection molding is a technique for manufacturing a material such as a thermosetting resin or a thermoplastic resin into a molded article of various forms, a metering process for measuring the molten resin in the mold, an injection process for filling the molten resin in the mold, and The cooling step of solidifying the resin after filling is completed, the mold opening step of opening the cooled mold, and the ejection step of taking out the injection molding formed in the mold.

In the injection molding made of such a process, an upper mold and a lower mold forming a mold of a mold are formed, and a cavity is formed between the upper mold and the lower mold for the shape of the product, and an injection molding is molded, or between the upper mold and the lower mold. The core is installed in the injection molding at the cavity between the core and the upper mold.

On the other hand, the cooling process, which is a process for solidifying the resin after the injection process during injection molding, forms a cooling water hole through which cooling water circulates inside the mold in order to make the thermal conductivity of the mold uniform and to improve the shape of the product, that is, the injection molding. Through a medium cooling method, and a natural cooling method to naturally cool.

In particular, in order to satisfy the physical properties of the injection molding during injection molding, the temperature of the mold must be maintained at a predetermined temperature (about 100 ° C), so that the injection proceeds by heating the mold for a predetermined time during the injection process. If it is not cooled enough, the quality of the product will be deteriorated, and during the cooling process, the temperature of the mold heated to high temperature should be cooled to at least 60 ° C or lower.

However, there has been a problem in that the productivity of the injection molding is lowered as the cooling time for cooling the high temperature mold is increased in order to secure the fluidity of the molten resin during injection molding.

In addition, in the case of molding a product having a thick thickness of an injection product or a product having a severe cross-sectional change, defects occur in the product due to uneven cooling during the cooling process.

In particular, it is difficult to maintain a constant circulation speed of the cooling water, which causes a problem of generating a sink mark or the like in the injection molded product.

In order to solve the above problems, the present invention directly supplies cooling air to the cavity surface of the injection mold and the surface of the injection molded product, thereby increasing the cooling efficiency of the injection mold by using a direct cooling method using the thermal conductivity of the injection mold, thereby saving thermal energy. The purpose is to improve the productivity of the product by reducing the cooling time of the injection mold.

In order to achieve the above object, the present invention provides an air cooling system of an injection mold, comprising: a mold opening spaced apart from a lower mold by a predetermined distance when the upper mold enters a cooling process after an injection process is made during injection molding; A cooling air supply unit for rapidly cooling the surface of the cavity of the upper mold and the surface of the injection molded product by injecting cooling air into a gap between the upper mold and the lower mold opened by the mold opening part; And a control unit for supplying cooling water to the lower mold when entering a cooling process during injection molding, and controlling the mold opening and the supply unit to supply cooling air to provide an air cooling system of the injection mold. do.

In addition, in the present invention, the cooling air supply unit air cooling unit for producing external hot air as cooling air; An air injection unit connected to the air cooling unit to supply cooling air to a gap between the upper mold and the lower mold generated by the mold opening unit; And a controller for operating an air cooling unit and an air injection unit in cooperation with the control unit.

In addition, in the present invention, the control unit controls the amount of cooling water supplied to the lower mold, the cooling water supply speed, and the like, and the amount of cooling air supplied from the cooling air supply, the supply time of the cooling air and the degree of metal content Provided is an air cooling system for an injection mold.

In addition, in the present invention, the air cooling method of the injection mold, (a) a mold closing step of preparing the injection molding proceeds by closing the upper mold and the lower mold; (b) after completion of the mold closing step, the injection mold heating step of supplying and circulating a heating medium to the injection mold to satisfy the physical properties of the injection molding to maintain the temperature of the injection mold at a high temperature of 100 ℃ ~ 130 ℃; (c) an injection step of maintaining a constant pressure until the gate of the injection mold is solidified after completion of the injection mold heating step, and filling the molten resin into the cavity of the upper mold through an injection machine; (d) After completion of the injection step, supply the cooling water to the cooling water hole formed in the lower mold, spaced apart the upper mold and the lower mold by a predetermined interval for cooling the molten resin, and supply the cooling air through the gap generated at the top A cooling step of cooling the cavity surface of the mold and the surface of the injection molded product; (e) a secondary mold opening step of opening the injection mold for taking out the injection-molded injection product after completion of the cooling step; And (f) after the secondary mold opening step, the take-out step of taking out the injection; provides an air cooling method of the injection mold comprising a.

In addition, in the present invention, the step (d) is (d1) the primary mold opening step of separating the upper mold from the lower mold by a predetermined interval; (d2) a cooling water supplying step of supplying cooling water to the cooling water hole formed in the lower mold; And (d3) simultaneously with the cooling water supplying step, operating the cooling air supply unit under the control of the controller to supply cooling air cooled to a predetermined temperature to rapidly cool the surface of the cavity and the injection molding of the upper mold. It provides an air cooling method of the injection mold comprising a.

Further, in the present invention, after the injection step, plasticizing the molten resin for further injection, the generation of bubbles in the injection mold, the metering and back pressure step to increase the density of the molten resin is carried out simultaneously with the cooling step. An air cooling method of an injection mold is provided.

In addition, in the present invention, the metering and back pressure step is provided immediately after the injection step is completed, starting at the same time as the cooling step, and provides an air cooling method of the injection mold, characterized in that completed before the cooling step.

According to the present invention, by directly supplying the cooling air to the cavity surface of the injection mold and the surface of the injection molded product, through the direct cooling method using the thermal conductivity of the injection mold to increase the cooling efficiency of the injection mold to save thermal energy, injection mold It is possible to reduce the cooling time of the product has the effect of improving the productivity of the product.

1 is a configuration block diagram schematically showing an air cooling system and a method of an injection mold according to an embodiment of the present invention,
Figure 2 is a flow chart showing an air cooling system and method of the injection mold according to an embodiment of the present invention,
3 is a process diagram schematically showing a process of cooling the injection mold through cooling air according to a preferred embodiment of the present invention;
4 and 5 are media flow diagrams for heating and cooling an injection mold according to a preferred embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used to refer to the same components, even if displayed on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a block diagram schematically showing the air cooling method of the injection mold according to a preferred embodiment of the present invention, Figure 2 is a flow chart showing an air cooling method of the injection mold according to a preferred embodiment of the present invention, Figure 3 Process diagram schematically showing a process of cooling the injection mold through the cooling air according to a preferred embodiment of the invention, Figures 4 and 5 are a flow chart of the medium for heating and cooling the injection mold according to a preferred embodiment of the present invention.

As shown, the air cooling method of the injection mold of the present invention, after the injection process, when the cooling process is in progress, the air in a state of being cooled while maintaining the molding pressure of the upper mold 110 and the lower mold 120 By directly supplying cooling air between the upper mold 110 and the lower mold 120, the cooling air is rapidly cooled not only to the surface of the injection molding but also to the surface of the cavity 112 of the mold. By switching to maximize the efficiency of the cooling process to shorten the time of the cooling process, it is an invention that can significantly improve the productivity of the injection molding.

As shown in FIG. 1, the present invention provides a mold opening part 130 spaced apart from the upper mold 110 and the lower mold 120 by a predetermined interval at the same time as the cooling water is supplied to rapidly cool the mold. It comprises a cooling air supply unit 140 for supplying cooling air between the gap between the 110 and the lower mold 120, and a control unit 150 for controlling the mold opening 130 and the cooling air supply unit 140.

The mold opening part 130 separates the upper mold 110 from the lower mold 120 at a predetermined interval within a range in which the internal pressure of the mold is maintained, and is connected to the upper mold 110 and under the control of the controller 150. It works.

The mold opening part 130 is operated under the control of the control unit 150 when entering the cooling process after the injection process is made by the injection molding machine during the injection molding, the upper mold 110 from the lower mold 120 1 While spaced apart by ~ 5mm, the cooling air supplied from the cooling air supply unit 140 to directly cool the surface of the cavity 112 and the surface of the injection molding of the upper mold (110).

The cooling air supply unit 140 cools the outside air to a predetermined temperature under the control of the controller 150 and cools the air between the gap between the upper mold 110 and the lower mold 120 generated by the mold opening 130. By supplying the component to cool the surface of the cavity 112 and the surface of the injection molding of the upper mold (110).

The cooling air supply unit 140 includes an air cooling unit 142 that sucks external hot air to produce cooling air having a cold property from the hot air, and the cooling air generated by the air cooling unit 142. Air cooling unit 142 and air injection in accordance with the signal of the control unit 150 in conjunction with the air injection unit 144 and the control unit 150 for supplying cooling air between the gap between the mold 110 and the lower mold 120. The controller 146 operates the unit 144.

Here, the air cooling unit 142 is preferably configured by supplying compressed air having a predetermined pressure to the outside air of hot nature, consisting of cold air, that is, an air cooler that separates only the cooling air, but is not limited thereto. An air cooler that produces cooling air by means of a separate electrical device or refrigerant may be used.

The cooling air supply unit 140 directly supplies the cooling air to the surface of the injection molding, so that the injection of the plastic can be solidified rapidly, and by supplying the cooling water through the cooling water hole to the lower mold 120 of the injection molding. The injection-molded plastic injection molding is in close contact with the lower mold 120 so as to be solidified.

That is, the present invention cools the heat inside the mold by a cooling method of cooling the lower mold 120 using cooling water, and directly cools the surface of the injection molding and the surface of the cavity 112 of the upper mold 110. By supplying air to cool the surface of the mold, it is possible to significantly shorten the time of the cooling process in the injection process.

The controller 150 controls the injection process as a whole, and in particular, controls the cooling process, and measures the temperature of the mold to control the operation of the mold opening 130 and the cooling air supply 140.

The control unit 150 controls the amount of cooling water supplied to the lower mold 120, the cooling water supply speed, etc. according to the measured mold temperature, and at the same time the amount of cooling air supplied from the cooling air supply unit 140 and the It is preferable to control the supply time, supply speed and the like to supply the cooling air.

In addition, the controller 150 controls the operation of the injection molding machine configured during injection molding. This controls the nozzle temperature, injection position, and injection pressure of the injection molding machine, and various molding conditions such as injection time, weighing time, process time, weighing RPM, cooling time, and the like.

As shown in FIG. 2, the present invention configured as described above is configured to mold the upper mold 110 and the lower mold 120 of the injection mold to prepare the injection molding in order to perform injection molding of the plastic injection molded product through the plastic molten resin. The mold closing step S310 is performed.

In addition, as shown in Figure 4, before injecting the molten resin, in order to satisfy the physical properties of the injection molding along with the dimensional deformation of the injection mold, preventing the solidification of the resin, steam, heater, By supplying and circulating a heating medium such as a heat medium oil, an injection mold heating step S320 is performed to maintain a high temperature state of the mold at a temperature of 100 ° C. to 130 ° C.

When the heating of the injection mold is completed, maintaining a constant pressure until the gate of the injection mold is solidified, the injection step (S330) for filling the molten resin into the cavity 112 of the upper mold 110 through the injection machine is in progress. .

In addition, when the filling of the molten resin is completed into the injection mold, the pressure inside the injection mold is measured to determine the reflow and shrinkage of the resin and to refill the resin, but the resin in the cavity 112 of the upper mold 110 flows back. Filling until not maintained pressure holding step (S340) to maintain the internal pressure of the injection mold is in progress.

Immediately after completion of the injection process (S330), plasticize the resin for further injection, prevent backflow of the resin during plasticization, and allow the resin in the nozzle portion supplied with the molten resin to be packed to generate bubbles in the molten resin in the injection mold. As well as preventing, the metering and back pressure step (S340) to increase the density of the molten resin is in progress.

This metering and back pressure step (S340) is a cooling step is performed for the solidification of the resin when the injection step (S330) is completed, the metering and back pressure step (S340) is to be completed within the cooling time for the solidification of the resin desirable. That is, the metering and back pressure and the cooling are started at the same time immediately after the injection step S330 is completed, and the scheme and the back pressure are completed before the cooling.

On the other hand, after the injection step (S330), a cooling step for cooling the molten resin is performed.

Here, in the cooling step of the present invention, while the mold opening part 130 is operated by the control unit 150, at least 1 m to 5 that there is no variation in the internal pressure of the injection mold between the upper mold 110 and the lower mold 120. The primary mold opening step S350 is performed to form a gap of ˜m.

Thereafter, as shown in FIG. 5, a cooling water supply step (S360) of cooling the inside of the injection mold to 60 ° C. is performed by supplying cooling water to the cooling water hole formed in the lower mold 120 of the injection mold.

In addition, at the same time as the cooling water supplying step (S360), the control unit 150 operates the cooling air supply unit 140 to supply the cooling air cooled to a predetermined temperature to the cavity 112 and the surface of the injection molding of the upper mold 110. As a result, a cooling air supply step S370 for rapidly cooling the surface of the cavity 112 and the injection molded product of the upper mold 110 is performed.

Then, the cooling step, that is, when the primary mold opening step (S350), the cooling water supply step (S360), the cooling air supply step (S370) and the like is completed, the secondary mold opening step (S380) of the injection mold for taking out the product is It proceeds, and the extraction step (S390) for taking out the injection is in progress.

Such an air cooling system and method of the injection mold of the present invention directly supply cooling air to the cavity surface of the injection mold, thereby increasing the cooling efficiency of the injection mold through a direct cooling method using the thermal conductivity of the injection mold to save thermal energy. And, it is a very innovative invention that can reduce the cooling time of the injection mold to improve the productivity of the product.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

110: upper mold 120: lower mold
130: mold opening 140: cooling air supply
150: control unit

Claims (7)

In the air cooling system of the injection mold,
After the injection process is made during the injection molding, the mold opening portion spaced apart from the lower mold by a predetermined interval when entering the cooling process;
A cooling air supply unit for rapidly cooling the surface of the cavity of the upper mold and the surface of the injection molded product by injecting cooling air into a gap between the upper mold and the lower mold opened by the mold opening part; And
When entering the cooling process during the injection molding, the control unit to supply the cooling water to the lower mold, and to control the mold opening and the supply to supply the cooling air
Air cooling system of the injection mold comprising a.
The method of claim 1,
The cooling air supply unit
An air cooling unit that produces external hot air as cooling air;
An air injection unit connected to the air cooling unit to supply cooling air to a gap between the upper mold and the lower mold generated by the mold opening unit; And
A controller for operating an air cooling unit and an air injection unit in conjunction with the control unit;
Air cooling system of the injection mold comprising a.
The method of claim 1,
The control unit controls the amount of cooling water supplied to the lower mold, the cooling water supply speed, and the like, and controls the amount of cooling air supplied from the cooling air supply unit, the supply time of the cooling air, and the degree of metal content. Cooling system.
In the air cooling method of the injection mold,
(A) a mold closing step of preparing the injection molding to proceed by mold closing the upper mold and the lower mold;
(b) after completion of the mold closing step, the injection mold heating step of supplying and circulating a heating medium to the injection mold to satisfy the physical properties of the injection molding to maintain the temperature of the injection mold at a high temperature of 100 ℃ ~ 130 ℃;
(c) an injection step of maintaining a constant pressure until the gate of the injection mold is solidified after completion of the injection mold heating step, and filling the molten resin into the cavity of the upper mold through an injection machine;
(d) After completion of the injection step, supply the cooling water to the cooling water hole formed in the lower mold, spaced apart the upper mold and the lower mold by a predetermined interval for cooling the molten resin, and supply the cooling air through the gap generated at the top A cooling step of cooling the cavity surface of the mold and the surface of the injection molded product;
(e) a secondary mold opening step of opening the injection mold for taking out the injection-molded injection product after completion of the cooling step;
(f) taking out the injection-molded product after the secondary mold opening step
Air cooling method of the injection mold comprising a.
The method of claim 4, wherein
The step (d)
(d1) a primary mold opening step of separating the upper mold from the lower mold by a predetermined distance;
(d2) a cooling water supplying step of supplying cooling water to the cooling water hole formed in the lower mold; And
(d3) a cooling air supplying step which proceeds simultaneously with the cooling water supplying step and supplies cooling air cooled to a predetermined temperature by operating the cooling air supply unit under the control of the control unit to rapidly cool the surface of the cavity and the injection molding of the upper mold;
Air cooling method of the injection mold comprising a.
The method of claim 4, wherein
After the injection step, plasticizing the molten resin for further injection, air generation of the injection mold, characterized in that the bubble generation in the injection mold, the metering and back pressure step to increase the density of the molten resin is carried out simultaneously with the cooling step. Way.
The method according to claim 6,
The metering and back pressure step is started immediately after the injection step is completed, at the same time as the cooling step, air cooling method of the injection mold, characterized in that completed before the cooling step.



KR1020100059374A 2010-06-23 2010-06-23 Injection Mold Die of Air Cooling System And Method for The Same KR101264893B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101495623B1 (en) * 2011-07-04 2015-02-25 캐논 가부시끼가이샤 Method of manufacturing a resin molded gear by injection molding
WO2019098427A1 (en) * 2017-11-20 2019-05-23 동국실업 주식회사 Method for manufacturing cowl cross member and cowl cross member manufactured thereby
KR101977326B1 (en) * 2019-03-04 2019-08-28 아진산업(주) Mold cooling method

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KR20180082834A (en) 2017-01-11 2018-07-19 서용석 Manifold for distribution cooling water and method for manufacturing the same
KR102177891B1 (en) * 2019-07-04 2020-11-13 양칠남 Apparatus with innjection mold for air intake hose
KR20220040937A (en) 2020-09-24 2022-03-31 엘지전자 주식회사 Injection molding machine and manufacturing method of injection molded part using the same
KR20230060277A (en) 2021-10-27 2023-05-04 엘지전자 주식회사 Mold for injection molding, injection molding machine having the same and manufacturing method of injection molded part using the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101495623B1 (en) * 2011-07-04 2015-02-25 캐논 가부시끼가이샤 Method of manufacturing a resin molded gear by injection molding
WO2019098427A1 (en) * 2017-11-20 2019-05-23 동국실업 주식회사 Method for manufacturing cowl cross member and cowl cross member manufactured thereby
KR101977326B1 (en) * 2019-03-04 2019-08-28 아진산업(주) Mold cooling method

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