KR101174050B1 - Concentration cooling type molding apparatus - Google Patents

Abstract

PURPOSE: A mold device of a concentrated cooling type is provided to maintain same temperature through not only a hot runner valve gate but also entire core because a separate cooling passage is formed around the valve gate to maintain uniform cooling around the valve gate. CONSTITUTION: A mold device of a concentrated cooling type comprises a fixed upper core(10), a fixed core block(11), a movable lower core, and a movable core block. A cooling line(14) is formed in the fixed upper and lower cores. First and second cooling lines(14a,14b) of the cooling line pass through the edge sections of the core block from inlets(15a,15b) arranged in one side of a width direction of the core block to in X and Y axes. The first and second cooling lines are extended to outlets(16a,16b) arranged in the opposite side of the width direction of the core block to be arranged in two-row parallel structure. The upper core comprises a gate cooling passage, a gate inlet port(22), and gate cooling lines(24a,24b). The peripheral portion of a gate valve heated during molding is cooled by using the gate cooling passage and the gate cooling lines.

Description

Concentration cooling type molding apparatus

The present invention relates to a concentrated cooling die apparatus, and more particularly, to a concentrated cooling die apparatus which improves the cooling efficiency by applying a two-row series cooling system to the core portion of the mold base.

In general, molds can be divided into injection molds that produce plastic products, press molds that make products using steel plates, and die casting molds that melt metal and make them together with plastics. Usually, it is divided into a movable type and a fixed type.

In addition, in the injection mold, the plastic product is filled with the material melted at a high temperature between the respective molds by high pressure, so that the product is produced along the inner shape of the mold.

In injection molding or the like, it is very important to cool and keep the temperature of the molding die constant from the viewpoints of securing stable productivity, maintaining the quality of the molded product, such as dimensions and precision.

In the plastic injection process, a cooling process for solidifying the resin is performed after the injection process in which the molten resin is filled in the mold.

Among the cooling methods used in such a cooling process, a method of using a cooling circuit in which cooling water is circulated inside the mold is used to uniformize heat conduction of the mold and improve the shape of the product.

Currently, the cooling system mainly applied to the mold apparatus has a drawback in that the flow is slow because of parallel cooling, and the cooling speed is different for each facility.

In addition, this cooling method causes a temperature non-uniformity of the left and right parts of the core symmetrical shape, and the cooling of the central portion of the core with a high temperature during injection is delayed, resulting in a deformation of the product as well as a non-uniform core temperature with other parts. As a result, the cooling cycle time of the entire mold becomes longer, which leads to a lower productivity.

In addition, the hot runner valve gate portion of the core is raised to the highest temperature. The cooling of the valve gate portion depends on the coolant flowing in the core, causing shrinkage in the shape of the parts around the valve gate, and the cycle. There is a disadvantage that can not shorten the time.

Accordingly, the present invention has been devised in view of such a point, and by applying a cooling method of a two-row series structure arranged in a balanced manner on the left and right portions of the core when cooling the core portion of the mold base, It is an object of the present invention to provide a centralized cooling mold apparatus capable of shortening the overall cycle time according to the improvement of the cooling efficiency by implementing a new type of centralized cooling system that allows uniform cooling to be achieved.

In addition, the present invention by forming a separate cooling flow path around the hot runner valve gate, by implementing a new type of individual cooling method that can be managed in the same manner as the ambient temperature while maintaining a uniform cooling around the valve gate, It is possible to maintain the same temperature throughout the core part of the valve gate as well as to provide a mold device consisting of a combination of individual cooling and intensive cooling, which can reduce the cycle time and ensure product quality. There is a purpose.

In order to achieve the above object, the centralized cooling apparatus provided by the present invention has the following features.

The concentrated cooling type mold apparatus is an injection mold apparatus including a stationary core and a fixed core block and a movable core, a core and a movable core block. Is provided, the cooling line is composed of the first cooling line and the second cooling line which are disposed on the left body portion and the right body portion which is divided into two sides of the whole body of the core block to the left and right symmetrical structure, respectively, The first cooling line and the second cooling line extend from the inlet of one side of the core block in the width direction to the outlet of the opposite side of the core block in the width direction of the core block along the X and Y axis directions (for example, the core block). It consists of a two-row parallel structure each arranged in a "c" form along the edge section).

Accordingly, the intensive cooling mold apparatus uses a cooling line having two rows of parallel cooling structures, that is, two rows and a first cooling line and a second cooling line arranged in parallel on the left and right sides of the core block. By cooling the core, an excellent cooling efficiency can be obtained, which in turn can shorten the cooling cycle time.

Here, it is preferable to have an auxiliary cooling line for cooling the center of the core in Hacoa of the intensive cooling mold apparatus, and the auxiliary cooling line has a left body part and a right body which bisects the entire body part of the core block to the left and right. The first auxiliary cooling line and the second auxiliary cooling line, which are disposed in each portion and form a symmetrical structure with each other, respectively, wherein the first auxiliary cooling line and the second auxiliary cooling line are formed from the auxiliary inlet on one side of the core block in the width direction of the core block. After passing through the bottom and passing through the core block center section along the X- and Y-axis directions, after passing through the bottom of the core block, it extends to the auxiliary outlet on the opposite side of the core block in the width direction (for example, along the core block center section). It may be configured as a single-column parallel structure arranged in each of the "c" form via).

The upper core has a circular gate cooling passage formed along a circumference of the valve gate, and extends from both inlets and outlets of the gate cooling passage to gate inlets and gate outlets formed in the fixed core block. It is preferable to configure the structure including a gate cooling line. Accordingly, the gate cooling flow path and the gate cooling line may be used to separately cool the vicinity of the valve gate that has the highest temperature during injection.

Intensive cooling mold apparatus provided by the present invention has the following advantages.

First, by adopting two rows of parallel cooling methods, which have a symmetrical form along with the outer edge of the core, the entire core can be efficiently and efficiently cooled, thus reducing the overall cooling cycle time (from 22 seconds to 13.5 seconds). There is an advantage in that productivity can be improved.

Second, by maintaining a constant cooling and the surroundings by cooling the valve gate portion that rises the highest temperature with a separate cooling device during the mass production process, it is possible to manage the temperature around the valve gate and its surroundings equally, There is an advantage that can ensure a uniform quality, such as to prevent deformation of the surrounding parts shape.

1A and 1B are perspective views illustrating a mold apparatus of a concentrated cooling method according to an embodiment of the present invention.
Figure 2a to 2d is a perspective view showing the top core and the fixed core block in the centralized cooling apparatus according to an embodiment of the present invention
Figure 3a to 3c is a perspective view showing a hacoa and movable core block in the centralized cooling apparatus according to an embodiment of the present invention
Figure 4a and 4b is a schematic diagram showing the flow of coolant in the mold apparatus of the concentrated cooling method according to an embodiment of the present invention

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1A and 1B are perspective views illustrating a mold apparatus of a concentrated cooling method according to an embodiment of the present invention.

As shown in Figs. 1A and 1B, the mold base 28 of the mold apparatus is composed of a plurality of block assemblies, in which each block is mounted separately from the stationary side and the movable side of the press mold like the conventional mold base. .

For example, the stationary side block includes an upper core 10, a fixed core block 11 for accommodating the upper core 10, and a plurality of fixed side base blocks 29a, 29b, 29c, and the like. The movable side block belongs to the hacoa 12, the movable core block 13 for accommodating the hacoa 12 inward, and the plurality of movable side base blocks 30a and 30b.

In addition, a slide core 31 is interposed between the movable core block 13 and the hacoa 12, and the slide core 31 at this time is disposed along the circumference of the hacoa 12 while the hacoa 12 is disposed. ) And the cavity is formed, and is installed in a structure that slides by an angular pin method, an inclined cam method, or the like.

Therefore, the upper core 10 and the fixed core block 11 belonging to the fixed side, the fixed side base blocks 20a, 29b, and 29c, and the hacoa 12 and the movable core block 11 belonging to the movable side. ), As the movable side base blocks 30a and 30b are combined up and down, one mold base 28 can be completed.

Here, the mold base 28 does not show a big difference in terms of the component construction surface or the operation method with the conventional mold base used in the injection mold.

2A to 2D are perspective views illustrating an upper core and a fixed core block in a concentrated cooling die apparatus according to an embodiment of the present invention.

As shown in FIGS. 2A to 2D, the upper core 10 is a portion forming the cavity of the product shape together with the hacoa 12 and the slide core 31, and is formed at the bottom of the fixed core block 11. It is installed in a structure that is inserted and seated in the core seat surface (groove) formed.

The upper core 10 is provided with a cooling line 14 for cooling the core outer portion, wherein the cooling line 14 is a first cooling line 14a disposed symmetrically with each other on the left and right sides of the core block. And a second cooling line 14b.

Here, the cooling line refers to a hole processed in the core block to allow a cooling medium such as cooling line cooling water to be described below.

In particular, in the present invention by applying the cooling line 14 having a two-row parallel cooling structure to the upper core 10, it provides an advantage that can maximize the cooling efficiency.

To this end, the body portion of the core block of the upper core 10 made of a rectangular shape is divided into left and right body parts by dividing the body part sideways (along the X-axis direction), and thus the left and right body parts are divided. The first cooling line 14a and the second cooling line 14b each having a two-row structure in the portion are provided in parallel arrangement.

Accordingly, in contrast to the existing cooling line of the one-row serial structure that continues in a row on the core block body, two cooling lines are arranged in parallel on the left and right sides in a symmetrical structure, and the cooling lines at this time are configured in two rows. As a result, the cooling efficiency can be greatly increased.

Looking at the shape of the first cooling line 14a and the second cooling line 14b as follows.

The first cooling line 14a and the second cooling line 14b have a cooling line having the same trajectory except for a structure in which the first cooling line 14a and the second cooling line 14b are symmetrically arranged.

For example, the first cooling line 14a and the second cooling line 14b may be formed from the inlets 15a and 15b of one side of the core block in the width direction through the core block edge sections along the X and Y axes. It consists of two rows of lines respectively arranged in a form extending to the outlet openings 16a and 16b on the opposite side of the block width direction.

That is, the first cooling line 14a and the second cooling line 14b extend from the inlets 15a and 15b in the X-axis direction in parallel with the core block sides, and then again rotate the direction by 90 ° to the Y-axis. Direction is extended in a direction, and then continues to be rotated again by 90 ° to form a "c" shaped arrangement structure connected to the outlets 16a and 16b.

In this case, the inlets 15a and 15b and the outlets 16a and 16b of the first cooling line 14a and the second cooling line 14b are formed at positions facing each other, and thus are introduced into one side of the core block. Cooling medium such as cooling water is shown to flow through the opposite side of the core block.

The inlets 15a and 15b and the outlets 16a and 16b of the first cooling line 14a and the second cooling line 14b are inlet passages 32a of two rows each formed in the fixed core block 11. 32b and the outlet passages 33a and 33b are connected to each other, and the outer ends of the inlet passages 32a and 32b and the outlet passages 33a and 33b of the fixed core block 11 at this time are connected via a fitting. It is connected to the external cooling medium supply line (not shown) side.

Accordingly, the cooling medium such as the cooling water enters the inlet flow paths 32a and 32b of the fixed core block 11 and the first cooling of the upper core 10 through the inlets 15a and 15b of the upper core 10. The line 14a, 14b and the second cooling line 15a, 15b are passed through, and subsequently discharged along the path of the outlet openings 16a, 16b of the upper core 10, thereby the core block of the upper core 10. Cooling of the core block can be performed while passing along the edge section.

In particular, in addition to cooling the upper core 10 in a two-row parallel cooling structure, the present invention provides a method of separately cooling the periphery of each valve gate 20 belonging to the upper core 10.

Here, the valve gate 20 is a means for injecting the molten resin into the cavity, it is installed in a structure that vertically penetrates the core block of the upper core (10).

In order to cool the periphery of the valve gate 20, a gate cooling flow path 21 having a substantially circular trajectory around the valve gate 20 is formed at the upper edge of the core block of the upper core 10. Both ends of the gate cooling flow passage 21, that is, the inlet and the outlet of the opposite side, are connected to the gate cooling lines 24a and 24b formed in the fixed core block 11, respectively (substantially, a block to be described later). The outer end of each of the gate cooling lines 24a and 24b is connected to an external cooling medium supply line (not shown) via a fitting. It has a fitting and is connected to each gate inlet 22 and gate outlet 23 formed on the outer surface of the fixed core block 11.

In this case, the gate cooling passage 21 is formed of a passage of a shape that dug the bottom surface of the core block in a semi-circular cross section.

In particular, an O-ring 34 having a shape disposed along the trajectory of the flow passage is mounted on the inside and the outside of the gate cooling flow passage 21 to prevent the cooling water and the like from flowing out to the valve gate 20 side. .

The gate cooling passage 21 is finished by a block body 26 assembled to the upper core 10. For example, the groove 25 is formed in the periphery through which the valve gate 20 passes. The bottom surface of the groove portion 25 is formed with a gate cooling passage 21 formed of a flow path having a semi-circular cross section, and is installed in a structure in which a square block-shaped block body 26 is inserted into and coupled to the groove portion 25. Therefore, the gate cooling passage 21 formed between the passage of the semicircular cross section and the bottom of the block body can be formed.

In addition, two connection passages 26a and 26b are formed in the block body 26 to penetrate the thickness of the block body. The connection passages 26a and 26b are formed at the top of the gate cooling lines 24a and 24b, and It is connected to the inlet and the outlet of the furnace gate cooling channel, respectively.

Therefore, the cooling water separate from the core side around the valve gate 20 by the gate cooling passage 21 in the upper core 10 and the gate cooling lines 24a and 24b in the fixed core block 11. As the back flows, it is possible to effectively cool the vicinity of the valve gate where the temperature rises the highest during injection.

3A to 3C are perspective views illustrating a hacoa and a movable core block in a mold apparatus of a concentrated cooling method according to an embodiment of the present invention.

As shown in FIGS. 3A to 3C, the structure for cooling the hacoa 12 is substantially the same as the structure for cooling the upper core 10 described above.

For example, by dividing the body portion of the core block of the Hacoa 12 made of a rectangular shape into left and right parts along the left and right (along the X axis direction), the left and right parts The first cooling line 14a and the second cooling line 14b each having a two-row structure in the body portion are installed in a parallel arrangement.

In more detail, the first cooling line 14a and the second cooling line 14b are formed from the inlets 15a and 15b of one side of the core block in the width direction through the core block edge section along the X and Y axes. It consists of two rows of lines respectively arranged in a form extending to the outlet openings 16a and 16b on the opposite side of the block width direction.

That is, the first cooling line 14a and the second cooling line 14b extend from the inlets 15a and 15b in the X-axis direction in parallel with the core block sides, and then again rotate the direction by 90 ° to the Y-axis. Direction is extended in a direction, and then continues to be rotated again by 90 ° to form a "c" shaped arrangement structure connected to the outlets 16a and 16b.

In this case, the inlets 15a and 15b and the outlets 16a and 16b of the first cooling line 14a and the second cooling line 14b are formed at positions facing each other, and thus are introduced into one side of the core block. Cooling medium such as cooling water is shown to flow through the opposite side of the core block.

The inlets 15a and 15b and the outlets 16a and 16b of the first cooling line 14a and the second cooling line 14b are inlet flow passages 32a of two rows each formed in the movable core block 13. 32b and the outlet passages 33a and 33b are connected to each other, and the outer end portions of the inlet passages 32a and 32b and the outlet passages 33a and 33b of the movable core block 13 at this time are connected via a fitting. It is connected to the external cooling medium supply line (not shown) side.

Accordingly, the cooling medium such as the cooling water is inlet flow paths 32a and 32b of the movable core block 13 → inlets 15a and 15b of the hacoa 12 and the first cooling lines 14a and 12 of the hacoa 12. 14b) and the second cooling line (15a, 15b) → along the path of the outlet (16a, 16b) of the hakoa 12 along the core block edge section of the core (10) while cooling the core block It can be done.

In particular, in the present invention, a means capable of effectively cooling the center portion of the hacoa 12, for example, the region of the central portion that is more inward than the outer region where the cooling is performed by the first cooling line and the second cooling line. To provide.

To this end, the Hacoa 12 is provided with an auxiliary cooling line 17 for cooling the central portion of the core, wherein the auxiliary cooling line 17 is a left body portion and a right body that is bisected the body of the core block left and right The first auxiliary cooling line 17a and the second auxiliary cooling line 17b each having a symmetrical structure while being disposed over the portions are constituted.

The first sub-cooling line (17a) and the second sub-cooling line (17b) is located in the center of the core block more than the first cooling line (14a) and the second cooling line (14b) in the Hacoa (12) It will be in charge of cooling.

The first sub-cooling line 17a and the second sub-cooling line 17b pass through the bottom of the core block from the auxiliary inlets 18a and 18b on one side of the core block in the width direction, and pass through the core block center section. After extending a certain distance along the direction, it is again extended by a certain length in the Y-axis direction by 90 ° again, and then extended by a certain length in the X-axis direction by again bending the 90 ° direction, and then the auxiliary side of the opposite side of the core block in the width direction. The arrangement structure of the "c" shape is connected to the outlet (19a, 19b).

In this case, the auxiliary inlets 18a and 18b and the auxiliary outlets 19a and 19b are connected to the auxiliary inlet passage 35 and the auxiliary outlet passage 36 formed in parallel in the Y-axis direction on the movable core block 13, respectively. Thus, cooling water and the like can be provided.

The auxiliary inlets 18a and 18b and the auxiliary outlets 19a and 19b of the first auxiliary cooling line 17a and the second auxiliary cooling line 17b are formed at positions facing each other, such as cooling water introduced from one side. Of the cooling medium can pass through to the opposite side after passing through the central region of the lower core (12).

Figure 4 is a schematic diagram showing the flow of cooling water in the mold apparatus of the concentrated cooling method according to an embodiment of the present invention.

As shown in FIG. 4, the cooling medium in the upper core 10, for example, the cooling water flow and the cooling water flow of the hacoa 12 are respectively shown.

First, the coolant flow in the upper core 10 is made of the arrow path as follows.

Cooling water supplied from the outside is the inlet flow paths 32a and 32b of the fixed core block 11 → the inlets 15a and 15b of the upper core 10 and the first cooling lines 14a and 14b of the upper core 10 and The second cooling line (15a, 15b) → flows along the path of the outlet (16a, 16b) of the upper core 10, this cooling water is passed along the core block edge section of the upper core 10 to the core block Cooling will be performed.

Next, the coolant flow in the outer region of the Hacoa 12 is made by the arrow path as follows.

The cooling water supplied from the outside is the inlet flow paths 32a and 32b of the movable core block 13 → the inlets 15a and 15b of the hacoa 12 and the first cooling lines 14a and 14b of the hacoa 10 and The second cooling line (15a, 15b) → flows along the path of the outlet (16a, 16b) of the Hacoa 10, this cooling water is passed along the core block edge section of the core (10) to the core block Cooling will be performed.

And, the coolant flow in the central region of the lower core 12 is made of the arrow path as follows.

Cooling water supplied from the outside is the auxiliary inlet flow path 35 of the movable core block 13 → the auxiliary inlets 18a and 18b of the hacoa 12 → the first auxiliary cooling line 17a and the first auxiliary cooling line of the hacoa 12. 2 Auxiliary cooling line (17b) → flows along the path of the secondary outlet (19a, 19b) of the Hacoa 12, this cooling water is cooled along the core block center area of Hacoa 10 while cooling the core block Will perform the action.

As described above, in the present invention, by constructing a cooling system having a two-row cascade structure that is disposed on the left side and the right side of the core body in a balanced manner, it is possible to perform uniform cooling over the entire core area, thus improving cooling efficiency. The overall cycle time can be shortened.

In the above, certain preferred embodiments according to the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and a person of ordinary skill in the art may vary without departing from the spirit of the technical idea of the present invention described in the claims below. Will be able to carry out the change.

10: upper core 11: fixed core block
12: hacoa 13: movable core block
14 cooling line 14a: first cooling line
14b: second cooling line 15a, 15b: inlet
16a, 16b: outlet 17: auxiliary cooling line
17a: first secondary cooling line 17b: second secondary cooling line
18a, 18b: Auxiliary inlet 19a, 19b: Auxiliary outlet
20: valve gate 21: gate cooling flow path
22: gate inlet 23: gate outlet
24a, 24b: gate cooling line 25: groove
26a, 26b: connection path 27: block body
28: mold base 29a, 29b, 29c: fixed side base block
30a, 30b, 30c: movable side base block 31: slide core
32: entry passage 33: exit passage
34: O-ring 35: Auxiliary entrance passage
36: auxiliary exit passage

Claims (6)

An injection mold apparatus including an upper core 10 and a fixed core block 11 on the fixed side, a hacoa 12 and a movable core block 13 on the movable side,
The top core 10 and the hacoa 12 are provided with a cooling line 14 for cooling the core outer portion, and the cooling line 14 has a left body portion and a right body which are bisected to the left and right sides of the core block. The first cooling line (14a) and the second cooling line (14b), which are disposed in each portion and at the same time symmetrical structure with each other, the first cooling line (14a) and the second cooling line (14b) has a core block width It is a two-row parallel structure arranged in such a way that it extends from the inlets 15a and 15b on one side of the direction to the outlets 16a and 16b on the opposite side of the core block in the width direction along the X and Y axis directions. Done,
The upper core 10 is formed in a fixed gate block 11 from a circular gate cooling passage 21 formed along a circumference of the valve gate 20, and both inlets and outlets of the gate cooling passage 21. And gate cooling lines 24a and 24b extending to the gate inlet 22 and the gate outlet 23, respectively, by using the gate cooling passages 21 and the gate cooling lines 24a and 24b. Intensive cooling mold apparatus, characterized in that to be cooled separately around the valve gate that the temperature rises the highest during injection.
The inlet 15a, 15b and the outlet 16a, 16b of the first cooling line 14a and the second cooling line 14b are formed at positions facing each other, and at the same time the inlet 15a, 15b Cooling line connecting between the outlet and the outlet (16a, 16b) is a concentrated cooling type mold apparatus, characterized in that arranged in the form of "C" passing along the edge of the core block.
The method of claim 1, wherein the Hacoa (12) is provided with an auxiliary cooling line 17 for cooling the central core, the auxiliary cooling line 17 is a left body portion and a right body which is bisected the body of the core block to the left and right The first auxiliary cooling line (17a) and the second auxiliary cooling line (17b) arranged in each of the portions and symmetrical structure with each other, respectively, the first auxiliary cooling line (17a) and the second auxiliary cooling line (17b) After passing through the bottom of the core block from the auxiliary inlets (18a, 18b) on one side of the core block in the width direction and passing through the bottom of the core block along the core block center section along the X and Y axes, Intensive cooling mold apparatus, characterized in that consisting of a single row parallel structure arranged in a form extending to the auxiliary outlet (19a, 19b), respectively.
The auxiliary inlet port 18a, 18b and the auxiliary outlet port 19a, 19b of the first auxiliary cooling line 17a and the second auxiliary cooling line 17b are formed at positions facing each other. Cooling line connecting between the (17a, 17b) and the auxiliary outlet (19a, 19b) is a mold apparatus of the centralized cooling method characterized in that arranged in the form of "C" passing along the core block center section.
delete The method of claim 1, wherein the gate cooling passage 21 is formed in the periphery through which the valve gate 20 penetrates the groove 25, and at the same time a semicircular cross-sectional flow path is formed on the bottom surface of the groove 25 at the time Intensive cooling type mold apparatus, characterized in that the block portion (27) having a connection passage (26a, 26b) in the groove portion 25 is mounted to the top of the passage.

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