KR101119344B1 - The core insert-method cooling-equipment of plastic injection molding - Google Patents

Abstract

PURPOSE: A core insertion-type cooling device of a plastic injection mold is provided to supply even cooling effect in forming parts and elements by inserting a template and core. CONSTITUTION: A core insertion-type cooling device of a plastic injection mold comprises multiple tank cooling holes, a circulating pipe buried groove(120), a fixed holder(200), and a free curve-form cooling water circulating connection pipe(300). Multiple tank cooling holes is perpendicularly formed in the bottom surface or the side of a core(20) assembled in the template of the injection mold. The circulating pipe buried groove is engraved on the bottom or lateral side of the core. The fixed holder is formed inside each tank cooling hole. The fixed holder injects the cooling water inside the tank cooling hole. The fixed holder is within a range of an inner diameter of the tank cooling hole. The cooling-water circulation connection pipe guides the connection and circulation of the cooling water according to the free curve.

Description

The core insert-method cooling-equipment of plastic injection molding}

According to the present invention, various parts (inserts, mill pins, undercut treatment devices, fastening bolts, etc.) in the actual product forming part, the template, and the core are complicated to be installed quickly and easily to the point where it is difficult to form a waterway (cooling). The present invention relates to a new core insert chiller having a uniform and effective cooling efficiency.

Usually, the upper core and the lower core embedded in the upper plate and the lower core embedded in the lower plate are matched with the parting line (the point where the mold is opened) based on the parting line (including the die casting mold for molding the resin and the alloy). Subsequently, a substantial product molding part (cavity into which molten high-temperature liquid resin is injected) is formed on the contact surface of the upper and lower cores, and various parts necessary for mold operation and product molding are inserted in the upper and lower cores. , Mill pins, undercut treatment devices, fastening bolts, etc.).

On the other hand, the cooling of the injection mold is based on the fact that timely cooling of the hot molten material injected into the molding part allows easy removal of the molded product, but the degree of fixation or shrinkage of the molded product depends on the efficiency and uniformity of the cooling. And various defects (agglomeration, wrinkles, cracks, etc.), and the efficiency of product removal, are important factors influencing the overall injection molding process and quality.

Conventional structure for the cooling means of the mold, the cooling water circulation passage upper plate and the lower plate or the upper core, the lower core to form a plurality of vertically long cooling circulation holes from one end to the other end in the inside of the lower core, and then input / circulate the cooling water there Was cooling. (Aka: Joule cooling)

However, in the case of the above-mentioned conventional cooling means, since the cooling water holes are formed vertically in the horizontal direction in the upper plate and the lower plate or the upper core and the lower core,

If you avoid all kinds of complicated parts installed in the template or core, it is not only limited to the space to form the cooling holes,

Cooling down to a point in close proximity to the upper, lower core, or lower side, which is a substantial requirement for substantial cooling, is virtually difficult, with high efficiency cooling in place and uniform and effective cooling for a variety of moldings.

In order to compensate for this, a method of improving the cooling efficiency by further drilling additional tank cooling holes in a vertical direction at a plurality of points within the path range through which the horizontal linear cooling circulation holes pass, has also been proposed.

In addition, compared to forming only the cooling circulation holes of the straight form as before, the more advantageous cooling effect can be obtained by the addition of tank cooling.

Since the tank cooling can also be configured only in the path of the linear cooling water circulation hole, which must be formed in a state where all the complicated parts installed in the template or core are avoided, the limitation of installation still exists.

In particular, since the tank cooling hole is vertically drilled from the mold to the middle point or more in the core, an O-ring (other rubber packing, etc.) for preventing leakage of coolant larger than the tank cooling hole should be interposed at the boundary between the template and the core. By that,

Accordingly, since the required space must be substantially larger than the diameter of the tank cooling hole required for cooling, this also causes a considerable problem such as being another cause of limitation in the installation of the cooling means between the complicated parts.

Therefore, the above-mentioned conventional cooling structures have unnecessarily long cooling cycles when cooling the molded part of the product, and it is practically difficult to impart uniform cooling property according to the shape, structure and other characteristics of the product, and thus, to a good degree of injection molding. There is a difficult problem.

Furthermore, due to the cooling non-uniformity in the mold, not only have different cooling rates for each part of the molding part, but also the shrinkage size and shape of each part are different, so deformations and accompanying defects such as wrinkles, cracks, and distortions ( There is a serious problem of increasing the defective rate, which is urgently needed.

Patent, and recently, Rapid Heat Cycle Molding (RHCM), Momentary mold Surface Heating (MMSH), Rapid heating using pressurized hot water for the purpose of improving the quality and productivity of injection products according to the operation of more precise high-tech products. Considering the trend of introducing new injection molding methods such as E-Molde, high frequency heating method, RT-Cooling, etc., the need for high-efficiency cooling method that can actively cope with the new method is more important.

Therefore, in the present invention, the tank cooling of the water-cooled cooling system required for the injection mold is configured as a type that is directly inserted / buried on the core, the cooling water circulation connected between the tank cooling adopts a free curved connection between the core and the template contact. The technical problem of the present invention is to provide a novel core-insertable cooling device that can provide coolness in place in a quick and simple way among various complicated components (insert, mill pin, undercut processing device, fastening bolt, etc.). It is completed as.

The present invention for achieving the above technical problem to form a plurality of tank cooling holes 110 vertically on the bottom or side in contact with the template 10 of the core 20 of the injection mold, the plurality of tank cooling holes Between the (110) is formed in the engraved circulation pipe groove 120; Each of the tank cooling holes 110 is provided with a fixing holder 200 in a cooling hole, while the tank cooling holes different from the cooling holes in the fixed holder 200 inserted into and fixed to the plurality of tank cooling holes 100, respectively. Between the fixed holder 200 in the other cooling hole inserted into and fixed in the (100) between the free flowing coolant circulation connection pipe to induce the cooling water connection and circulation in a free curve in the state embedded in the circulation pipe embedded groove 120 ) Was made by buying.

As described above, the core injection type cooling apparatus of the plastic injection mold according to the present invention is installed on the bottom surface or the side surface of the core in contact with the mold of the injection mold, and various parts and molding parts installed on the template or the core. It can be freely configured regardless of any position, size, depth, and shape by avoiding interference, and it is possible to give more effective and uniform cooling property, and by installing watertight O-rings larger than the inner diameter of tank cooling hole between the template and core. Unlike the conventional one, which required a large installation space, the water-tight O-ring of the cooling means of the present invention is inserted into the tank cooling hole, so that installation in a smaller space is possible, which is more advantageous in terms of space utilization. As well as the location of the tank cooling holes, the size and depth of the tank cooling hole is more easily expanded and cope with the need for cooling. Cooling on the core surface (molded part) can be more directly and aggressively responded to the present invention, which is very useful for constructing a rapid or instant cooling system that has recently been in high demand.

1 is a view illustrating a preferred embodiment of the present invention
Figure 2 is an exemplary embodiment of the side cross-sectional fixed holder operating state of the present invention
Figure 3 is an exemplary embodiment of the connection state of the bottom fixing holder and the circulation pipe of the present invention
4 is a perspective view of the fixing holder of the present invention
5 is an exploded view illustrating the fixing holder assembly of the present invention.
Figure 6 is an exemplary cross-sectional view of the fixed holder of the present invention
Figure 7 is an exemplary embodiment of the core bottom fixing holder insertion state of the present invention
8 is an exemplary view showing a fixing holder and another embodiment of the present invention.
9 is an exemplary view showing an embodiment of the diaphragm for baffle of the present invention
10 is an exemplary view showing another embodiment of the diaphragm for baffle of the present invention

Core injection type cooling apparatus of the plastic injection mold of the present invention will be described in more detail based on the accompanying drawings.

That is, the present invention is inserted / assembled in the mold (upper, lower plate, 10) of the injection mold, a plurality of tank cooling holes 110 on the bottom or side of the core 20 having a core upper product shape 21 on the upper surface ) Is formed in a vertical depth up to a predetermined depth, the bottom surface or the side of the core 20 side contacting the template 10 and the core 20 between the plurality of tank cooling holes 110, the circulation pipe embedded groove 120 Engraved with;

Cooling capable of preventing leakage and fixing of the coolant within the inner diameter range of the tank cooling hole 110 while allowing the inlet and outlet of the coolant into the tank cooling hole 110 inside each of the tank cooling holes 110. While installing the hole holding holder 200,

Between the cooling hole in the fixed holder 200 inserted into and fixed to the plurality of tank cooling holes 100 and the other cooling hole in the fixed holder 200 inserted into another tank cooling hole 100, the circulation pipe embedded groove ( In the embedded state 120, a free curved cooling water circulation connection pipe 300 for inducing free curve cooling water connection and circulation is embedded.

The fixing holder in the cooling hole 200 is installed after being inserted into the tank cooling hole in the above configuration,

The hook ring projection 211 is formed on the upper side, and the lower part constitutes a holder body 210 including a watertight means assembly unit 212 formed integrally,

One side and the other side of the inside of the holder body 210 is configured to pass through the coolant inlet 213 and the outlet 214, respectively,

The lower end of each of the inlet 213 and the outlet 214 protrudes the pipe connector 215 for binding the cooling water circulation connection pipe,

At least one watertight O-ring 221 and a close contact ring 222 contacting the O-ring 221 are alternately assembled to the watertight means assembly 212 at the bottom of the holder body 210, respectively.

A lower O-ring 221 is applied to the bottom of the contact ring 222 at the bottom thereof by applying a pressing force and a pressing force to the contact ring 222 and the water tight O-ring 221 assembled in order to the watertight means assembly unit 212, respectively. ) Can be manufactured in a structure that further comprises the O-ring pressing means 230 to have a water tightness and a fixed force in a constant tank cooling hole 110 by expansion of the volume and outer diameter according to the compression.

At this time, in the case of the O-ring pressing means 230 of the components of the fixed holder 200 in the cooling hole,

As shown in FIG. 7, one or more bolt engagement grooves 241 are formed on the bottom surface of the watertight means assembly unit 212, and the lower side of the contact ring 222 assembled to the watertight means assembly unit 212. A lower cap 242 having a bolt hole 242a is formed, and then the pressure adjusting bolt 243 is coupled to press the contact ring 222 and the O-ring 221 using the pressure adjusting bolt 243. To make it work,

Alternatively, the plurality of jaws 251 are formed at regular equal intervals around the outer side of the lower end of the watertight means assembly 212, and then the jaws collectively with the entire jaws 251 at the rear side thereof. Push the binding ring (252) to be bound by force to form a locking bond, or

Alternatively, the binding plate having a jaw groove 263a corresponding to the jaw hole 261 and the jaw hole 261 and protrudes from the bottom surface of the bottom of the water-sealing means assembly 212, the protrusion (261) 263) of the configuration to push by force

Application of any one selected structure enables easy pressurization of the contact ring 222 and the watertight O-ring 221.

Of course, as the structure of the O-ring pressing means 230 may be proposed in addition to the above-described structure, it is natural that not only the above configuration but also all other components of the same similar category belong to the rights of the present invention.

On the other hand, when the cooling holder in the fixing hole 200 is inserted into the tank cooling hole 110 and installed,

As shown in FIGS. 2, 9, and 10, the cooling water introduced into the cooling tank cooling hole 110 is formed on the upper side of the holder body 210 through which the inlet 213 and the outlet 214 pass. Install a baffle diaphragm 271 that separates the inlet and the outlet so that circulation is possible within the space,

Alternatively, if the inlet 213 of the holder body 210 is installed at the end of the inlet 213 to selectively apply the induction pipe 272 for the bubble to set the coolant inflow position to a higher position, effective cooling is possible.

However, in some cases, when the fixing holder 200 in the cooling hole is inserted into the tank cooling hole 110 by a higher height to be installed very close to the core upper product shape 21,

By installing a very short baffle diaphragm 271 or a bubble induction pipe 272 or eliminating the installation of the baffle diaphragm 271 or a bubble induction pipe 272, the cooling cycle is further shortened. In this case it may be rather effective.

And the tank cooling hole 110, as described above can be processed to a constant depth from the bottom or side of the core 20 that can be easily separated from the template 10,

If only the complicated shape of the various parts and the molded part provided on the template 10 or the core 20 is avoided without interference,

Regardless of any other conditions such as a template, it can be formed into a desired free position, and its depth and inner diameter can be processed in various ways as needed.

In addition, the circulation pipe embedded groove 120 connected between the tank cooling hole 110 and another tank cooling hole 110 is also provided.

Intaglio is formed on the bottom or side surface of the core 20 that can be easily separated from the template 10,

Not only is it easy and easy to process, but the shape may be formed in a general straight line, but if it is necessary to avoid it without interference on various parts installed in the template 10 or the core 20, it may be formed in a curve. Free engraving is possible regardless of form.

Next, the free-form coolant circulation pipe 300 is installed in the engraved circulation pipe embedded groove 120,

An inlet provided in the lower portion of the fixed holder 200 in the cooling hole which is inserted into the tank cooling hole 110 and the other tank cooling hole 110 in the state of being embedded (inserted) in the engraved circulation tube embedding groove 120. As a member for connecting the (213) side pipe connector 215 and the outlet port 214 side pipe connector 215 with each other,

Although it is preferable to be made of a heat resistant rubber hose having free bending property and excellent heat resistance,

If necessary, copper (copper alloy, such as copper or new copper) pipes having excellent conductivity and having a certain degree of warpage may be applied.

10: upper, lower 20: core
21: core upper product shape 100: tank cooling hole
110: tank cooling hole 120: circulation pipe embedded groove
200: fixed holder `210: holder body
211: engaging projection 212: assembly
213: inlet 214: outlet
215: connector 221: O-ring
222: contact ring 230: O-ring pressure means
242a: bolt hole 242: lower cap
243: pressure adjustment bolt 251: jaw grip
252: binding ring 261: jaw grip
263: binding plate 263a: jaw locking groove
271: baffle plate 272: induction pipe for baffle
300: circulation tube

Claims (8)

A plurality of tank cooling holes 110 are inserted into the template (upper, lower plate, 10) of the injection mold, and a plurality of tank cooling holes 110 are formed at a predetermined depth on the bottom or side of the core 20 having the core upper product shape 21 on the upper surface. It is formed in the vertical direction, the bottom surface or the side of the core 20 side contacting the template 10 and the core 20 between the plurality of tank cooling holes 110 and the negatively formed circulation pipe embedded groove 120 ;
Cooling capable of preventing leakage and fixing of the coolant within the inner diameter range of the tank cooling hole 110 while allowing the inlet and outlet of the coolant into the tank cooling hole 110 inside each of the tank cooling holes 110. While installing the hole holding holder 200, the cooling holder in the other cooling hole 100 inserted into and fixed in the tank cooling hole 100 and the other cooling hole fixing holder 200 respectively inserted and fixed in the plurality of tank cooling holes 100. Between 200, the embedded configuration of the free-cooling coolant circulation connection pipe 300 for inducing the cooling water connection and circulation to the free curve in the state embedded in the circulation pipe embedded groove 120;
The fixing holder in the cooling hole 200 is installed after being inserted into the tank cooling hole in the above configuration,
The hook ring projection 211 is formed on the upper side, and a lower portion of the holder body 210 including the integrally formed watertight means assembly portion 212 is formed integrally, then one side and the inside of the holder body 210 The other side is configured to penetrate the cooling water inlet 213 and the outlet 214, respectively, the lower end of each of the inlet 213 and the outlet 214 protruding configuration of the pipe connector 215 for binding the cooling water circulation connection pipe,
At least one watertight O-ring 221 and an adhesion ring 222 contacting the O-ring 221 are alternately assembled to the watertight means assembly unit 212 below the holder body 210, and the bottom Under the contact ring 222, a soft O-ring 221 is applied to the contact ring 222 and the water-tight O-ring 221, which are assembled in order to the watertight means assembly unit 212, respectively. According to the expansion of the volume and outer diameter according to the core injection type cooling apparatus of the plastic injection mold, characterized in that the O-ring pressing means 230 further configured to have a water tightness and a fixed force in a constant tank cooling hole (110).
The method of claim 1,
The O-ring pressing means 230, at least one bolt binding groove 241 on the bottom surface of the watertight means assembly unit 212, the lower side of the contact ring 222 assembled to the watertight means assembly unit 212 Core injection type cooling apparatus of a plastic injection mold, characterized in that the lower cap 242 having a bolt hole (242a) in the configuration and then bind the pressure control bolt (243).
The method of claim 1,
The O-ring pressing means 230, a plurality of jaw locking holes 251 are formed at regular equal intervals on the outer circumference of the lower end of the watertight means assembly unit 212, and then the plurality of jawl locking devices 251 on the rear side thereof. ) The core injection type cooling apparatus of the plastic injection mold, characterized in that the binding ring 252 is fastened by pressing the binding ring (252) to be combined with the whole.
The method of claim 1,
The O-ring pressing means 230, protruding one or more jaws 261 on the bottom surface of the bottom of the water-sealing means assembly 212 and then jaws corresponding to the jaw 261 and the lower jaw corresponding to the lower side Core-insertable cooling apparatus of a plastic injection mold, characterized in that the binding plate (263) having a groove (263a).
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