KR101533080B1 - Injection mold with curved fluid streaming line - Google Patents

Abstract

Disclosed is an injection molding die having a fluid flow path through which a fluid such as steam for heating a die, or a coolant flows. The disclosed injection molding die comprises an upper core and a lower core which together form a cavity corresponding to the shape of an injection-molded product, wherein at least one of the upper core and the lower core includes an external block formed with a cavity face for limiting a cavity and an insertion groove on the opposite side surface of the cavity face; and an internal block inserted into the insertion groove. A dead-end face of the insertion groove and the internal block facing the dead-end face are curved faces as facing each other to be closely adhered, and the internal block is formed with at least one curved channel which has an intaglio pattern and extends from the curved face. In addition, a curved fluid flow path in which at least one fluid of steam and coolant flows by at least one of the curved channel and the dead-end face is formed on the injection molding die.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an injection mold with curved fluid flow path,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an injection molding die, and more particularly, to an injection molding die having a fluid channel through which a fluid such as steam or cooling water flows for heating a die.

Injection molding is a method in which a molten resin is injected into a mold and cooled to form a product. Compared with other molding methods such as compression molding and extrusion molding, And the size is limited, and productivity and workability are excellent, and it is widely used for molding of plastic products.

The injection mold has an upper mold and a lower mold which are spaced apart or closely contacted with each other, and a resin injector is connected to one of the upper mold and the lower mold. The resin injector injects molten resin into a mold connected to the resin injector when the upper mold and the lower mold are in a mold-closing state, that is, in close contact with each other. The molten resin injected into the mold is injected into a cavity corresponding to the shape of the injection-molded product via a sprue, a runner, and a gate, and is hardened, and the upper mold and the lower mold When the mold is opened, that is, when the molds are spaced from each other, the resin is hardened and the formed injection-molded product is taken out.

Before the molten resin is injected into the mold, the periphery of the cavity does not rapidly rise to a temperature at which the viscosity of the molten resin can be minimized, or after the molten resin is injected into the mold, the molten resin around the cavity quickly reaches a temperature at which the molten resin can harden If it is not lowered, a weld line may occur in the injection-molded product, and the speed of production of the injection-molded product may be lowered. In the products formed with the weld line, the weld line must be removed through post-injection machining, resulting in lower productivity of the injection-molded product and higher production costs. Therefore, a core around the cavity of the mold is provided with steam for raising the temperature of the mold, and a fluid channel through which cooling water for lowering the mold temperature flows.

Typically, the fluid flow path is formed by drilling a hole in the core of the mold with a tool such as a drill, so that only a linearly extending fluid flow path can be formed. However, in the mold for injection molding a curved product, the cavity is curved so as to correspond to the product so that the interval between the straight fluid channel and the curved cavity is not uniform according to the point of the cavity. Therefore, the temperature is not uniform at various points in the cavity, so that the defective product rate and the production cost are increased and the productivity is lowered.

Korean Registered Patent No. 10-1448037

The present invention provides an injection molding die in which a cavity is curved and a fluid channel through which water vapor or cooling water flows is curved to correspond to the curved cavity.

The present invention also provides an injection molding die having a cavity curved in a curved shape corresponding to a curved product, wherein the temperature uniformly rises and uniformly falls at any point in the cavity.

The present invention provides an injection molding machine comprising an upper core and a lower core in which a cavity corresponding to a shape of an injection molded product is formed in close contact with each other, An outer block formed with a cavity face defining the cavity, an outer block having an insertion groove formed on an opposite side of the cavity surface, and an inner block inserted into the insertion groove, a dead-end face, and a side face of an inner block facing the curled face are curved faces of corresponding shapes to be in close contact with each other, and the inner block is provided with at least an engraved Wherein at least one curved channel and a curved fluid flow path through which at least one of the water vapor and the cooling water flows is limited Molding die.

The outer block may be formed with a linear fluid flow path connected to the curved fluid flow path in a fluid-flowable manner and including at least one straight extending section.

The straight extending section may be at least a part of a linear hole extending straight inward from an outer surface of the outer block.

The injection-molding die of the present invention may further comprise a plug for sealing the opening of the linear hole formed on the outer surface of the outer block.

The linear fluid flow path may include a plurality of straight extending sections intersecting with each other.

The injection molding die of the present invention further comprises an upper circular plate fixedly supporting the upper core and a lower circular plate fixedly supporting the lower core, wherein the core having the linear fluid flow channel formed therein is fixed The supporting disk can be fluidly connected to the linear fluid channel.

The injection mold according to the present invention has a curved fluid flow path extending along a curved surface corresponding to a curved cavity so that the shortest distance from the point to the cavity can be uniformly formed at all points of the curved fluid flow path. Accordingly, when water vapor or cooling water flows through the curved fluid channel, the temperature uniformly rises and uniformly falls without any variation at all points inside the cavity. Therefore, the defective ratio of the injection-molded product is lowered, the production cost is reduced, and the productivity is improved.

1 is a cross-sectional view illustrating an injection molding die according to an embodiment of the present invention.
Fig. 2 and Fig. 3 are exploded perspective views of the upper core of Fig. 1, Fig. 2 is a top view, and Fig. 3 is a bottom view.
Fig. 4 is a cross-sectional view of the present invention cut along the line IV-IV in Fig. 2;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an injection molding die having a curved fluid passage according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The terminology used herein is a term used to properly express the preferred embodiment of the present invention, which may vary depending on the intention of the user or operator or the custom in the field to which the present invention belongs. Therefore, the definitions of these terms should be based on the contents throughout this specification.

FIG. 1 is a sectional view showing an injection molding die according to an embodiment of the present invention, FIGS. 2 and 3 are exploded perspective views of the upper core of FIG. 1, FIG. 2 is a top view, and FIG. 3 is a bottom view . 1 to 3, an injection molding metal mold 10 according to an embodiment of the present invention is a mold for injection molding a curved product such as a radiator grill of a vehicle, And a lower mold 11 and an upper mold 21 which are spaced apart or close to each other. In the illustrated embodiment, the upper mold 21 is a fixed side mold fixed without reciprocating, and the lower mold 11 is movable up and down relative to the upper mold 21 to form a movable side mold. On the other hand, the upper mold 21 may be a movable mold and the lower mold 11 may be a fixed mold.

The upper mold 21 includes an upper core 27, an upper circular plate 22, and an upper mold base (not shown). The lower mold 11 includes a lower core 14, a lower circular plate 12, an eject plate (not shown), an eject pin (not shown), a spacer And a lower mold base (not shown). (Not shown) between the upper core 27 and the lower core 14 when the upper mold 21 and the lower mold 11 are in close contact with each other, that is, when the mold is closed. The cavity CA is formed. The upper core 27 is formed with an upper cavity face 40 defining an upper portion of the cavity CA corresponding to the upper shape of the injection molded product (not shown). The lower core 14 is formed with a lower cavity face 16 defining a lower portion of the cavity CA corresponding to the lower shape of the injection molded product (not shown).

The upper disk 22 fixedly supports the upper core 27, and the upper mold base (not shown) supports the upper disk 22. The lower disk 12 fixedly supports the lower core 14. An eject plate (not shown) and an eject pin (not shown) are formed on the upper mold 21 after the lower mold 11 is separated from the upper mold 21, that is, after the mold opening, (Not shown) from the lower cavity surface 16. A spacer (not shown) provides a space for allowing the eject plate (not shown) to move up and down. The lower mold base (not shown) fixes and supports the spacer (not shown).

The upper core 27 has an outer block 35, an inner block 30, and a cover 28. An upper cavity surface 40 is formed on the lower side of the outer block 35 and an insertion groove 36 is formed on the upper side of the outer block 35. The inner block 30 is inserted into the insertion groove 36. When the inner block 30 is inserted into the insertion groove 36, the dead-end face of the insertion groove 36, that is, the bottom surface 38 of the insertion groove 36 and the bottom of the inner block 30 The sides are in close contact with each other.

The cavity (CA) is also curved so as to be injection-molded into a curved shape. The bottom surface 38 of the insertion groove 36 and the bottom surface of the inner block 30 are curved faces corresponding to each other so as to be in close contact with each other and the curved surfaces correspond to the curved surfaces of the cavities CA It is the curved surface of the shape. The cover 28 closes the insertion groove 36 in which the inner block 30 is inserted and is fastened to the outer block 35 so that the lower side of the inner block 30 is inserted into the bottom surface 38 of the insertion groove 36 Tightly.

A plurality of curved channels 32 are formed on the lower side of the inner block 30 so as to be engraved and extending parallel to each other on the curved surface. A plurality of curved channels 32 and an insertion groove bottom surface 38 define a curved fluid flow path 44 through which fluid such as steam and cooling water flows. Since the curved fluid flow path 44 extends along a curved surface corresponding to the curved surface CA, the shortest distance from the arbitrary point of the curved fluid flow path 44 to the cavity CA is within a tolerance of several mm And becomes uniform. Therefore, when water vapor flows through the curved fluid flow path 44, the temperature uniformly rises at all points inside the cavity CA. When the cooling water flows through the curved fluid flow path 44, all the points inside the cavity CA The temperature is uniformly lowered without any deviation.

Fig. 4 is a cross-sectional view of the present invention cut along the line IV-IV in Fig. 2; Referring to FIGS. 2 to 4 together, the outer block 35 is formed with a linear fluid flow path 45 fluidly connected to the curved fluid flow path 44 (see FIG. 1). The linear fluid flow path 45 includes an inflow linear fluid flow path 45 for guiding the fluid introduced into the outer block 35 to the curved fluid flow path 44 (Not shown) for guiding the fluid introduced into the outer block 35 to the outside of the outer block 35.

The inflow linear fluid flow path 45 has the same number of first straight extending sections 46 as the number of the curved channels 32 and the same number of second straight extending sections 46 as the number of the first straight extending sections 46 48, one third straight extending section 50, and one fourth straight extending section 52, as shown in FIG. The plurality of first straight extending sections 46 are formed by cutting a portion of a straight hole formed by linearly extending in a direction parallel to the Y axis from one side of the outer block 35 using a tool such as a drill to be. The distal end of the first straight extending section 46 is aligned and extended so as to be connected in one-to-one relation with the one end 32a of the plurality of curved channels 32. [ An opening formed on one side of the outer block 35 due to the linear hole pierced to form the first straight extending section 46 is sealed by the first plug 55 so that fluid does not leak .

The plurality of second straight extending sections 48 are formed in a straight line extending from the lower side of the outer block 35 by a tool such as a drill so as to extend in a direction parallel to the positive Z- is a part of a hole. The second straight extending sections 48 are aligned and extended so as to cross the first straight extending sections 46 one on another. An opening formed in the lower side of the outer block 35 due to the linear hole pierced to form the second straight line extension section 48 is sealed by the second plug 57 so that fluid does not leak .

The third straight line extension section 50 is a straight hole formed by linearly extending in the direction parallel to the direction of the X axis negative (-) from the back surface of the outer block 35 by using a tool such as a drill. . The third straight extending section 50 is aligned and extended so as to intersect with all of the plurality of second straight extending sections 48. The opening formed in the back surface of the outer block 35 due to the linear hole pierced to form the third straight line extension section 50 is sealed by the third plug 59 so that the fluid does not leak.

The fourth straight line extension section 52 is formed by a straight hole extending linearly in the direction parallel to the Z axis negative direction from the upper side of the outer block 35 using a tool such as a drill. ). The distal end of the fourth straight line extending section 52 is aligned and extended so as to be connected to the third straight line extending section 50. The opening formed in the upper surface of the outer block 35 due to the linear hole pierced to form the fourth straight line extension section 52 is not sealed and the opening formed in the upper circular plate 22 And the upper disc inner fluid channel (23) is connected to the opening. Similarly to the inlet linear fluid channel 45, the inlet upper diaphragm inner fluid channel 23 is formed by drilling a straight hole in the upper circular plate with a tool such as a drill, And is formed by sealing.

(Not shown) formed in the outer block 35 on the opposite side of the inflow linear fluid channel 45 are similarly formed in the same manner as the method of forming the inflow linear fluid channel 45 . In other words, the outgoing straight fluid flow path has a first straight extending section (not shown) connected one-to-one with the other end 32b of the curved channel 32 and extending parallel to the Y-axis, (Not shown) extending in parallel with the Z axis, and a third straight extending section (not shown) connected to both the second straight extending section and extending parallel to the X axis And a fourth straight extending section (not shown) having a distal end connected to the third straight extending section. Reference numeral 65 denotes a first plug for sealing an opening of a straight hole pierced to form a first straight extension section of the outgoing straight fluid flow path, The second plug sealing the opening of the straight hole that is pierced to form the second straight extending section of the second straight line.

An outflow upper disk internal fluid flow path 25 is formed on the upper side disk 22 (see FIG. 1) opposite to the inflow upper side disk internal fluid flow path 23, and is connected to the outflow linear fluid flow path. 2 to 4, the inflow fluid channel and the outflow fluid channel may be opposite to each other. In other words, the drawing reference numeral '45' is a straight fluid channel for discharging, the reference numeral '23' is a discharging upper disc inner fluid channel, and the reference numeral 25 'may be an inflow upper disc inner fluid channel.

1, the lower core 14 is provided with a lower core rectilinear fluid channel 19 extending straightly so that a fluid such as water vapor or cooling water flows therethrough and a lower core linear fluid channel 19 extending toward the lower core rectilinear fluid channel 19, (Not shown) in the lower disk and a fluid channel (not shown) in the lower disk for discharging are provided. The method of forming the lower core linear fluid flow path 19 and the lower and upper raw material actuation fluid flow paths for the inlet and outlet is similar to the method of forming the linear fluid flow path 45 (see FIG. 4) of the upper mold 21 . In the illustrated embodiment, the lower mold 11, which is the movable mold, can be provided with a complicated structure such as an eject pin, so that it is difficult to easily arrange the curved fluid channel. Therefore, the curved fluid channel The lower core 14 may be provided with a curved fluid passage as in the case of the upper core 27. [

The upper mold 21 is provided with a sprue (not shown) connected to a resin injector (not shown) so that the molten resin is injected into the upper mold 21 and a resin And a lower mold 11 is further provided with a gate 18 connected to the cavity surface 16 of the lower core 14. [ The molten resin discharged from the resin injector at the time of closing the lower mold 11 in close contact with the upper mold 21 is injected into the cavity CA through the sprue (not shown), the runner 42 and the gate 18 And cured.

When steam is injected into the upper mold 21 (refer to FIG. 1) through the inflow upper disk inner fluid channel 23 before the molten resin is injected into the cavity CA, the inflow linear fluid channel 45 into the curved fluid flow path 44. The water vapor passing through the curved fluid flow path 44 flows out of the curved fluid flow path 44 and passes through the outflow linear fluid flow path (not shown) and the outflow upper circular fluid flow path 25 in order, 21). When the molten resin is injected into the cavity CA and then the cooling water is injected into the upper mold 21 (see FIG. 1) through the inflow upper disk internal fluid passage 23, the inflow linear fluid passage 45 To the curved fluid flow path (44). The cooling water that has passed through the curved fluid passage 44 flows out of the curved fluid passage 44 and passes through the outflowing linear fluid passage (not shown) and the outflow upper circular plate inner fluid passage 25 in order, 21).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

10: injection molding die 11: lower mold
12: lower original plate 14: lower core
21: Upper mold 22: Upper disc
27: upper core 28: cover
30: inner block 32: curved channel
35: outer block 45: straight fluid channel

Claims (6)

delete And an upper core and a lower core in which a cavity corresponding to the shape of the injection-molded product is formed when they are in close contact with each other,
At least one of the upper core and the lower core includes an outer block having a cavity face defining the cavity and an insertion groove formed on an opposite side of the cavity face; And an inner block inserted into the insertion groove,
Wherein a dead-end face of the insertion groove and a side face of the inner block facing the curled face are curved faces of a shape corresponding to the cavity face and being in close contact with each other,
Wherein at least one curved channel is formed in the inner block by engraving and extending on the curved surface,
Wherein the curved channel and the curved surface define a curved fluid flow path through which one of the water vapor and the cooling water flows,
Wherein the outer block is formed with a linear fluid flow path connected to the curved fluid flow path so as to be fluidly connected thereto and including at least one straight extending section. 3. The method of claim 2,
Wherein the straight extending section is at least a portion of a linear hole extending linearly inward from an outer surface of the outer block. The method of claim 3,
And a plug for sealing the opening of the linear hole formed on the outer surface of the outer block. 3. The method of claim 2,
Wherein the linear fluid flow path includes a plurality of straight extending sections intersecting with each other. 3. The method of claim 2,
An upper circular plate fixedly supporting the upper core; And a lower circular plate fixedly supporting the lower core,
Wherein an inner disk fluid flow path connected to the linear fluid flow path so as to be fluidly connected is formed in a disk that fixes and supports the core having the linear fluid flow path formed therein, out of the upper disk and the lower disk.

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