KR100963191B1 - Baffle pipe and core cooling apparatus of injection mold - Google Patents

Abstract

PURPOSE: A core chiller of an injection mold and a baffle pipe is provided to increase a cooling efficiency with the lower flow resistance of cooling water. CONSTITUTION: A baffle pipe(210) is installed within a core cooling water pipe(200). The core cooling water pipe is formed in the inner side of a bottom core(30). The baffle pipe is made with a plastic material. The baffle pipe is comprised of the body which is divided a left and a right part. The movement of the baffle pipe is prevented by positioning closely to the inner circumference of the core cooling water pipe.

Description

Baffle pipe and core cooling apparatus of injection mold}

The present invention relates to a core cooling apparatus of an injection mold for molding a plastic injection molding, and more particularly, to a baffle tube and an injection mold that allow the core to be uniformly and rapidly cooled by an efficient supply of cooling water circulating in the cooling water passage of the core. It relates to a core cooling device of.

In general, molds can be divided into injection molds for producing plastic products, press molds for making products using iron plates, and die casting molds for melting metals to make them together with plastics.

Among them, the injection mold is a plastic product produced along the internal shape of the mold by filling the molten material at high temperature between the molds by high pressure, and is mainly a raw material input process, a drying process, an injection machine raw material input process, and injection molding. Process, product take-out process, and post-processing and packaging process.

In addition, the injection molding process essentially passes a cooling process for solidifying the resin after an injection process for filling molten resin in the mold.

The cooling process of the injection mold is carried out in such a way that the cooling water pipes are piped into the core of the mold for injecting the product, and the injection molding is cooled and hardened by the cooling water passing through the cooling water pipes sequentially. In order to improve the shape of the product and to improve the shape of the product, a core cooling device of an injection mold having a baffle plate 61, which is a component that facilitates the circulation of cooling water, is provided inside the cooling water pipe.

As shown in Figure 1 and Figure 2, looks at the core cooling apparatus of the injection mold installed in the conventional baffle plate.

First, the mold for injection molding is the upper disk 10 and the lower disk 20 formed to form the mold of the mold, the lower core installed between the upper disk 10 and the lower disk 20 for processing the shape of the mold 30, the mold is composed of a cavity 40 formed between the upper disk 10 and the lower core 30 for injection.

In addition, a cooling water pipe is piped inside the lower core 30 to cool the casting in the cavity 40. The coolant pipe is formed in the lower disc 20 and formed with a coolant inlet 51 and a coolant outlet 52. The coolant pipe communicates with the inlet 51 and the outlet 52 of the basic coolant pipe. It consists of a core cooling water pipe (60) circulating the inside of the 30 and the baffle plate (61) is formed in the center.

Therefore, the cooling water supplied to the inlet 51 of the basic cooling water pipe during injection molding is circulated up and down the lower core 30 in a manner guided by the baffle plate 61 installed inside the core cooling water pipe 60, and thus the lower core. Cooling 30 is then discharged to the outside through the cooling water outlet 52.

However, the core cooling apparatus of the conventional injection mold as described above has the following problems.

First, the core cooling apparatus of the conventional injection mold has a long flow distance of the cooling water. Therefore, the temperature is greatly increased in the course of circulating the cooling water and the flow resistance of the cooling water is increased, the cooling water is not circulated at a constant speed, the cooling efficiency is greatly reduced.

Second, since the cooling efficiency is lowered in the course of circulating the cooling water, there is a problem that the temperature at one side and the other side of the lower core 30 becomes uneven. As such, if the cooling temperature of the lower core 30 becomes uneven, it causes deformation of the product and delays the cooling time of the entire mold due to the cooling delay, which leads to a serious problem that the productivity of the injection molded product is lowered as the ejection cycle time becomes longer.

Third, since the baffle plate 61 inside the core coolant pipe 60 is assembled such that both sides are simply supported on the inner circumferential surface of the core coolant pipe 60, in the process of circulating the coolant in the core coolant pipe 60. It is easy to flow, and the coolant leaks between the close contact surfaces with the core coolant pipe 60, greatly increasing the flow resistance of the coolant.

In addition, when the lower core 30 and the lower disk 20 for maintenance, all the baffle plate 61 is dropped, so much care is required during maintenance.

In order to prevent this phenomenon, it is possible to consider a method of assembling the baffle plate 61 in a press fit manner so as to be in close contact with the inner circumferential surface of the core coolant pipe 60, but in the assembling process, the baffle plate 61 is a core coolant pipe. (60) Not only is not easily inserted into the inside, but also the accident that the baffle plate 61 is bent during the insertion process, and during the maintenance, such as the baffle plate 61 is not separated, such as to expose a great problem in assembly and maintenance. Therefore, the situation is not adopted in a preferred way.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a cooling device for an injection mold core in which the core is uniformly cooled and the cooling is made quickly and efficiently.

In addition, an object of the present invention is to provide an apparatus for cooling an injection mold core which is easy to assemble a baffle plate and does not disturb the flow of cooling water.

In order to achieve the above object, the core cooling apparatus of the injection mold of the present invention is formed on the lower disc and formed with a cooling water inlet and a cooling water outlet, and a coolant pipe communicating with the inlet and outlet of the basic cooling water pipe to circulate the core inside. In the core cooling apparatus of the injection mold having a core cooling water pipe, the baffle pipe divided into left and right are coupled to the core cooling water pipe, and the cooling water inlet of the basic cooling water pipe is connected to the lower end of each baffle pipe. Cooling water flows into each core cooling water pipe at the same time, and the cooling water outlet of the basic cooling water pipe is connected to the lower portion of the core cooling water pipe on one side and flows into the bottom of the baffle pipe and is ejected from the upper portion of the core cooling water pipe. Cooling water that cools the lower core is discharged to the outside while falling to the bottom of the pipe. Characterized in that a lock.

Meanwhile, a plurality of heat dissipation protrusions may be formed on the outer circumferential surface of the baffle tube, and a plurality of heat dissipation wing pieces formed along the outer circumferential surface of the baffle tube may be formed in plural at regular intervals, and a heat dissipation spiral piece is formed along the outer circumferential surface of the baffle tube. May be

In addition, the outward flange is formed along the lower end of the baffle tube, the lower end of the cooling water pipe is preferably formed with a first supporting jaw for supporting the outward flange of the baffle tube. In this case, an O-ring cap is further inserted into a lower end of the outward flange to be in close contact with a lower end of the cooling water pipe, and a second support jaw supporting the O-ring cap is formed at the lower end of the cooling water pipe, between the O-ring cap and the cooling water pipe. O-rings may be installed between the O-ring cap and the lower disc, respectively.

The present invention configured as described above has the following effects.

First, since the present invention has a flow structure in which cooling water is simultaneously supplied to each cooling water pipe, all parts of the lower core can be cooled evenly.

Secondly, the present invention does not significantly increase the temperature of the coolant during the circulation of the coolant because the flow distance of the coolant is much shorter than in the prior art, the flow resistance of the coolant is also small, the cooling efficiency is greatly improved, and thus the take-out cycle is short As a result, productivity can be greatly improved.

Third, since the present invention follows a method that flows between the baffle tube and the inner circumferential surface of the coolant tube after the coolant is ejected to the upper end of the baffle tube, unlike the prior art, the baffle tube does not have to be closely adhered to the inner circumferential surface of the coolant tube; Has an effect of greatly improving the assemblability.

Fourthly, the present invention maximizes the heat exchange rate of the cooling water by forming turbulent flow in the cooling water when the heat radiation protrusions formed on the outer circumferential surface of the cooling water pipe are irregular, and induces rapid flow to the cooling water when formed in the vertical direction. The cycle is further shortened, and the cooling water pipe and the baffle pipe are prevented from flowing so that the baffle pipe can be centered inside the cooling water pipe.

Fifth, the present invention has an effect that the baffle tube does not flow during cooling because when the outward flange is formed in the lower baffle tube and the O-ring cap is installed, the baffle tube can be firmly fixed in the cooling water tube.

Sixth, the present invention because the perfect watertight is maintained through the O-ring cap and the O-ring installed in the O-ring cap has the effect that the cooling water in the supply or discharge process of the cooling water does not leak to the outside.

Seventh, the present invention has the effect that the O-ring cap is in close contact with the lower part of the cooling water pipe through the O-ring, even if the lower core and the lower disk for maintenance, the dropping tube is not dropped, the maintenance is improved.

The features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are defined in the technical spirit of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way. It must be interpreted to mean meanings and concepts.

As shown in Figures 3 to 6, the present invention is formed in the lower disk 20, the cooling water inlet 110 and the cooling water discharge port 120, the inlet 110 of the basic cooling water pipe and In communication with the outlet 120 is applied to the core cooling device of the injection mold having a core coolant pipe 200 piped to circulate inside the lower core (30).

According to the present invention, the baffle pipe 210 is coupled to the core cooling water pipe 200, and the cooling water inlet 110 of the basic cooling water pipe is connected to the lower end of each baffle pipe 210. The coolant outlet 120 of the basic coolant pipe is connected to the lower portion of the core coolant pipe 200 on one side.

The baffle tube 210 may be manufactured by machining a stainless steel plate, a copper plate, or an aluminum plate. However, the baffle tube 210 may be manufactured by injection into plastic because the manufacturing process is complicated and the unit price is high. For example, polycarbonate (PC) and glass fiber (GF) having excellent durability, heat resistance and corrosion resistance are contained, and the glass fiber is preferably made of 10 to 30 parts by weight based on 100 parts by weight of polycarbonate. . The GF means glass fiber in a resin state.

And the baffle pipe 210 is composed of the body (210a, 210b) divided into left and right, and the divided body (210a, 210b) is installed in a state of matching. When the baffle tube 210 is divided into left and right, it is easy to manufacture the baffle tube 210 as well as the left and right baffle tubes 210a and 210b when the cooling water flows inside the baffle tube 210. Since the heat dissipation protrusion 211 formed on the outer circumferential surface of the baffle tube 210 is closely contacted with the inner circumferential surface of the core cooling water pipe 200, the baffle tube 210 may be prevented from flowing. As a result, the baffle pipe 210 can be stably centered in the core coolant pipe 200.

The heat dissipation protrusion 211 is formed on the outer circumferential surface of the baffle tube 210. The heat radiating protrusions 211 may be formed in various directions to generate turbulence in the cooling water flowing through the core cooling water pipe 200. In this embodiment, the heat dissipation protrusion 211 is formed on the outer circumferential surface of the baffle tube 210 at uniform intervals and formed at regular intervals from the top to the bottom of the baffle tube 210. As such, when the coolant flows in turbulent flow, cooling efficiency may be improved because the coolant evenly flows inside the core coolant pipe 200.

On the other hand, as shown in Figure 7, the outer circumferential surface of the baffle tube 210 may be formed in a plurality of heat dissipation wings 218 formed along the outer circumferential surface of the baffle tube 210 at a predetermined interval.

Alternatively, as illustrated in FIG. 8, a heat radiation spiral piece 219 may be formed on the outer circumferential surface of the baffle tube 210 along the outer circumferential surface of the baffle tube 210.

As such, when the heat dissipation blade piece 218 or the heat dissipation spiral piece 219 is formed, the coolant has a constant directivity from the upper side to the lower side, thereby ensuring rapid fluidity.

The cooling water inlet 110 of the basic cooling water pipe has distribution pipes 111 connected to the bottom of each baffle pipe 210 so as to be connected to the bottom of each baffle pipe 210. Therefore, the cooling water supplied to the cooling water inlet 110 is simultaneously introduced into the lower end of the baffle pipe 210 installed in each of the core cooling water pipes 200 through the distribution pipes 111. The coolant introduced into the lower end of the baffle tube 210 is ejected to the upper end of the baffle tube 210 and then flows down to the lower portion of the core cooling water tube 200 by the heat radiating protrusion 211 of the baffle tube 210. The coolant flowing down the core coolant pipe 200 is discharged to the outside through the coolant outlet 120 connected to the core coolant pipe 200 on one side.

Meanwhile, an outward flange 212 is formed at a lower end of the baffle tube 210, and a first support jaw 213 supporting an outward flange 212 of the baffle tube 210 at a lower end of the core coolant pipe 200. ) May be formed. The outward flange 212 allows the baffle pipe 210 to be stably installed in the cooling water pipe.

In this case, an O-ring cap 214 that is in close contact with the bottom of the core coolant pipe 200 is further inserted into the lower end of the outward flange 212, and the O-ring cap 214 is supported on the bottom of the core coolant pipe 200. The second support jaw 215 is formed, and the O-rings 216 and 217 are preferably installed between the O-ring cap 214 and the coolant pipe and between the O-ring cap 214 and the lower disc 20, respectively.

In this way, the baffle pipe 210 may be firmly installed without being separated from the core coolant pipe 200 by the O-ring cap 214. In addition, the cooling water in the core coolant pipe 200 moves to the coolant discharge pipe 120 through the O-ring 216 installed between the O-ring cap 214 and the core coolant pipe 200, and flows out to the lower core 30. The cooling water is introduced into the lower end of the baffle pipe 210 through the distribution pipe 111 of the coolant inflow pipe 110 through an O-ring 217 installed between the O-ring cap 214 and the lower disc 20. The cooling water is prevented from flowing out between the O-ring cap 214 and the lower disc 20 in the process.

According to the core cooling apparatus of the injection mold configured as described above, the cooling water is simultaneously introduced into the bottom of the baffle pipe 210 of each core cooling water pipe 200 through each distribution pipe 111 of the cooling water inlet 110, and the baffle pipe ( Ascending along the 210 and is ejected into each of the core coolant pipe 200 through the top of the baffle pipe 210, and after the heat exchange with the lower core 30 while falling down the core coolant pipe 200, the cooling water outlet 120 It has a flow structure that quickly exits through).

Therefore, since each of the core coolant pipes 200 has a flow structure in which the coolant is simultaneously supplied, all parts of the lower core 30 are uniformly cooled, and since the flow distance of the coolant is very short than in the related art, cooling is performed quickly. The take-out cycle is very short.

Further, unlike the prior art, the assembly of the baffle tube 210 is greatly improved since the baffle tube 210 does not have to be assembled in a state in which the baffle tube 210 is in close contact with the inner circumferential surface of the core cooling water pipe 200. When the outward flange 212 and the O-ring cap 214 are installed, the baffle pipe 210 can be firmly fixed in the core coolant pipe 200 so that the baffle pipe 210 does not flow during cooling and is also maintained. Even though the lower core 30 and the lower disc 20 are spaced apart, the O-ring cap 214 is in close contact with the lower portion of the core coolant pipe 200 so that the baffle pipe 210 does not fall and maintainability is maintained. Is improved.

As described above, preferred embodiments of the present invention are described above with reference to the drawings, but the present invention is not limited to the above-described embodiments, and those skilled in the art to which the present invention pertains can make modifications without departing from the spirit of the present invention. Possible, such modifications will fall within the scope of the invention.

1 is a cross-sectional view of an injection mold for showing a core cooling device of a conventional injection mold.

2 is a detailed view of the main portion of FIG.

Figure 3 is an injection mold cross-sectional view showing a core cooling device of the injection mold according to the present invention.

4 is a detailed view of the main portion of FIG.

5 is a perspective view of a baffle tube constituting the present invention;

Figure 6 is an exploded perspective view of the baffle tube of the present invention.

7 is a perspective view showing another embodiment of the baffle tube of the present invention.

8 is a perspective view showing still another embodiment of the baffle tube of the present invention.

<Explanation of symbols for the main parts of the drawings>

20 Bottom plate 30 Core

110 Coolant inlet 111 Distribution pipe

120 ... Coolant outlet 200 ... Core coolant pipe

210 Baffle tube 211 Radiation protrusion

212 Outward flange 213 First support jaw

214 ... O-ring cap 215 ... second support jaw

216,217 O-ring 218 ...

219 Heat dissipation spiral

Claims (9)

As the baffle pipe 210 is formed to be installed in the core coolant pipe 200 formed inside the lower core 30, The baffle pipe 210 is made of plastic, and is composed of the body (210a, 210b) divided into the left and right, finely spaced from side to side when the coolant flows into the baffle pipe (210) on the inner peripheral surface of the core coolant pipe (200) The baffle tube 210 is characterized in that the more close to the baffle tube 210 to prevent the flow of the baffle tube 210. The method of claim 1, The baffle pipe 210 is a baffle pipe, characterized in that the heat dissipation projection 211 is formed in close contact with the inner circumferential surface of the core cooling water pipe 200 to increase the assembly. The method according to claim 1 or 2, The outward flange 212 is formed along the lower end of the baffle tube 210, the lower ring of the outward flange 212 is further fitted with an o-ring cap 214 to be in close contact with the lower end of the core cooling water pipe 200, O-ring (216) between the O-ring cap (214) and the core coolant pipe is further characterized in that the baffle pipe. A base coolant pipe formed on the lower disc 20 and configured to have a coolant inlet 110 and a coolant outlet 120, and communicating with an inlet 110 and an outlet 120 of the base coolant pipe to form an inner side of the lower core 30. In the core cooling apparatus of the injection mold having a core coolant pipe 200 piped to circulate the The core coolant pipe 200 is coupled to the baffle tube 210 made of plastic, and is divided into left and right so as to be finely spaced left and right when the coolant flows into the baffle tube 210. The cooling water inlet 110 of the basic cooling water pipe allows the cooling water to be simultaneously introduced into each of the core cooling water pipes 200 through the distribution pipes 111 connected to the lower ends of the respective baffle pipes 210. The cooling water outlet 120 of the basic cooling water pipe is connected to the lower portion of the core cooling water pipe 200 on one side and flows into the lower end of the baffle pipe 210 to be ejected from the upper portion of the core cooling water pipe 200 and then the core cooling water pipe ( Core cooling apparatus of the injection mold, characterized in that the cooling water cooling the lower core 30 to be discharged to the outside while falling to the bottom of the 200. The method of claim 4, wherein Core cooling device of the injection mold, characterized in that the outer circumferential surface of the baffle tube 210 is formed with a plurality of heat dissipation projections (211) for increasing the assembly. The method of claim 4, wherein Core cooling apparatus of the injection mold, characterized in that formed on the outer circumferential surface of the baffle tube 210 a plurality of heat dissipation blade pieces 218 formed along the outer circumferential surface of the baffle tube 210 at a predetermined interval. The method of claim 4, wherein Core cooling apparatus of the injection mold, characterized in that the heat radiation spiral piece 219 is formed along the outer circumferential surface of the baffle tube 210 on the outer circumferential surface of the baffle tube 210. The method of claim 4, wherein An outward flange 212 is formed along the lower end of the baffle tube 210, The core cooling apparatus of the injection mold, characterized in that the first support jaw (213) for supporting the outward flange (212) of the baffle pipe (210) is formed at the lower end of the core coolant pipe (200). The method of claim 8, O-ring cap 214 is further fitted to the lower end of the outward flange 212 to be in close contact with the lower end of the core coolant pipe 200, A second support jaw 215 supporting the O-ring cap 214 is formed at a lower end of the core coolant pipe 200. O-ring cap (214) and the core cooling water pipe 200, and between the O-ring cap (214) and the lower disk 20 O-rings (216, 217), respectively, characterized in that the core cooling device of the injection mold.

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