KR20170141079A - Injection mold with spiral lift core - Google Patents

Abstract

The present invention relates to an injection mold having a spirally operated lift core. Specifically, the injection mold comprises: first and second molds which form a cavity for molding an injection molded product by injection of resin; a lift core which is installed on one side of the first and second molds, and forms a part of the cavity to mold an undercut portion of the injection molded product; and a lift rod which is joined to one end of the lift core, and is installed on a pushing plate. More specifically, the lift core is installed on the lift rod, and comprises a first clearance, a second clearance, and a third clearance, wherein the first clearance is formed between the lift core and the lift rod in a first direction in which the injection molded product departs to be taken out; the second clearance is formed between the lift core and the lift rod in a second direction that is orthogonal to the first direction on a plane of the injection molded product; and the third clearance is formed in a third direction which is a length direction of the lift rod. According to the present invention, when taking out injection molded products such as highly functional multi-blade fan, having an undercut with a complicated structure, the lift core is allowed to rotate 3-dimensionally so as to avoid interfering with the undercut, thereby enabling a convenient molding and manufacturing of injection molded products such as highly functional multi-blade fans capable of being slimmed and having excellent durability and heat resistance.

Description

Injection mold with spiral lift core < RTI ID = 0.0 >

[0001] The present invention relates to an injection mold having a spiral-action operating bevel core and, more particularly, to a spiral-action operating bevel core having a structure favorable for forming and taking out of an injection-molded article having an undercut portion of a complicated structure such as a high- The branch relates to an injection mold.

Generally, when an undercut portion is formed in an injection molded article such as a main body or a component of an electric appliance, the injection mold is provided with an undercut processing device for forming an undercut portion of such injection molded article.

The injection mold is composed of an upper mold and a lower mold for forming a cavity, and a core for forming an undercut portion of the injection molded article is provided on one side of the upper mold and the lower mold. A support member for supporting the core and guiding the core to rotate when lifting and lowering the core and a core are integrally formed. When the upper mold is opened after the product is molded, the support member provided on the lower mold side moves up and down along the inclined surface of the lower mold to be taken out from the undercut portion of the injection molded article.

As an example of a technique for forming or removing a conventional undercut portion, there is disclosed an "apparatus for taking out an undercutter of an injection mold" disclosed in Korean Utility Model Publication No. 20-1988-0011852, which includes inserting an undercutter between the upper mold and the lower mold And an elevating groove made up of an inclined portion of a predetermined angle of inclination having a vertical moving width that has a predetermined vertical moving height at a predetermined position on the outer circumferential wall of the undercutter And guided by the guide pins provided on both sides so as to protrude inward from the fixing pieces of the lower mold.

Another prior art related to this is disclosed in Korean Patent Laid-Open No. 10-2007-0073518 entitled "Injection mold ", which comprises an upper and a lower mold for forming a cavity for molding a product, Wherein the core unit includes a core piece exposed to a cavity and a core piece coupled to the core piece by a coupling means, the core unit being coupled to the lower mold or one of the upper and lower molds And a support member for guiding the core piece from the cavity when the upper and lower molds are separated from each other.

As an injection mold having an inclined core for taking out a product having an undercut portion, Korean Patent Laid-Open No. 10-2011-0059115, entitled " Inclined Core Combination Structure for Injection Mold, " An operation chamber which is recessed from the lower surface of the upper plate coupled to the upper surface of the lower plate and connected to the track-shaped operation hole on the upper surface; A liner which moves left and right in the operation chamber and forms a connection groove so that the upper surface and the front and rear surfaces are connected to each other to form a connection groove; And an inclined core through which the engaging means is formed at the lower end so as to be restricted by the engaging means of the connecting groove through the operating hole.

However, such conventional techniques have a problem in that injection molding is difficult due to interference with the injection molded article, or ejection of the injection molded article becomes impossible during the molding of the multi-purpose fan, which requires high performance, and the productivity is lowered. Therefore, most of the high-performance fans are imported from overseas.

In addition, notebooks, refrigerators, computers, and the like are becoming slimmer, the size of the used fan also becomes smaller and demands high performance. Such a fan is used when sucking or discharging gas or fluid. The wing rotation angle is large, and the number of wings is increased. In addition, the more various kinds of injection resin are used, the more thermosetting resin is used. Therefore, the heat treatment of the mold is also an essential condition.

FIG. 1 and FIG. 2 are a perspective view and a plan view showing a polycarbonate pan as an example of an injection molded product to be produced through the development of an injection mold for solving the above problems.

Referring to FIGS. 1 and 2, a multi-blade fan 10 includes a plurality of blades 11 formed on a disk 12 so as to have a curvature, and a curvature of the blades 11 is curved The inclined core can not be operated because the undercut 13 is formed so as to intersect the operation direction a of the inclined core in the injection molding process so that the product takeout implementation of the multi- And had a problem that was inevitable.

In order to solve the problems of the prior art as described above, the present invention prevents interference with an undercut portion when an injection molded product having an undercut of a complex structure is taken out, such as a high-performance multi- It is an object of the present invention to enable molding and production of an injection molded article such as a high-performance dichroic fan having excellent heat resistance and the like.

Other objects of the present invention will become readily apparent from the following description of the embodiments.

According to an aspect of the present invention, there is provided a mold comprising: a first mold and a second mold for forming a cavity for molding an injection-molded article by injection of resin; An inclined core provided on one side of the first and second molds and forming a part of the cavity so as to form an undercut portion of the injection molded article; And an inclined rod having the inclined core coupled to one end of the inclined core, the inclined core having a first clearance between the inclined core and the inclined rod in a first direction in which the injection molded product is separated for taking out And a second clearance between the inclined rod and the inclined rod in a second direction orthogonal to the first direction on the plane of the injection molded article and having a third clearance in a third direction which is the longitudinal direction of the inclined rod, There is provided an injection mold having a spiral-acting tilting core, which is installed in a rod.

Wherein the inclined core forms an insertion hole for inserting the inclined rod so as to have the first and second clearances, and an engagement hole is formed on the inner side surface of the insertion hole so as to be caught by the stepped portion formed on the outer surface of the inclined rod And is provided so as to be separated from the inclined rod by a support ring provided with a fixing bolt at an end of the inclined rod so as to be movable by the third clearance between the step portion and the support ring .

The first clearance, the first clearance, or the third clearance may be 0.01 to 5 mm.

The first direction may be a longitudinal direction of the inclined core, and the second direction may be a width direction of the inclined core.

The first and second molds, the inclined core, and the ramp are installed in the main body in a large number, so that the injection molded articles can be formed in a plurality of molds.

According to the injection mold having the spiral-action operating bevel core according to the present invention, when the injection-molded product having an undercut portion having a complicated structure such as a high-performance multi-blade pan is taken out, the bevel core is prevented from interfering with the undercut by allowing 3D rotation, It is easy to mold and manufacture an injection-molded article such as a high-performance multi-blade fan having excellent slimness, durability and heat resistance.

1 is a perspective view showing an example of a multi-purpose fan to be manufactured through the development of an injection mold.
2 is a plan view of Fig.
3 is a cross-sectional view of an injection mold having a spiral-actuated tilting core in accordance with one embodiment of the present invention.
4 is a perspective view showing an inclined core and an inclined rod of an injection mold having a spiral-acting inclined core according to an embodiment of the present invention.
5 is a cross-sectional view for explaining the operation of an injection mold having a spiral-action operating bevel core according to an embodiment of the present invention.
6 is a plan view for explaining an operation of an inclined core of an injection mold having a spiral-directionally operating inclined core according to an embodiment of the present invention.
FIGS. 7 to 11 are views for explaining an injection mold having a spiral-action operating inclined core according to an embodiment of the present invention.
FIG. 12 is a plan view for explaining first and second clearances of an injection mold having a spiral-direction-operating inclined core according to an embodiment of the present invention. FIG.
13 is a side cross-sectional view for explaining a third clearance of an injection mold having a spiral-directionally operating warp core according to an embodiment of the present invention.
FIG. 14 is a perspective view for explaining the 3D spiral motion of an injection-molded article by an injection mold having a spiral-direction-operating inclined core according to an embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in detail in the drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention, And the scope of the present invention is not limited to the following examples.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant explanations thereof will be omitted.

Figure 3 is a cross-sectional view of an injection mold having a spiral-actuated tilting core in accordance with one embodiment of the present invention, Figure 4 is a perspective view of a tilted core of an injection mold having a spirally- Fig.

Referring to FIGS. 3 and 4, an injection mold 100 having a spiral-acting operation inclined core according to an embodiment of the present invention forms a cavity 101 for molding an injection-molded article by injecting resin An inclined core 130 provided on one side of the first and second molds 110 and 120 and forming a part of the cavity 101 so as to form an undercut portion of the injection molded article; The slope core 130 may include a slope rod 140 coupled to the plate 150 and may include first to third clearances between the slope core 130 and the slope rod 140. [ .

The first and second molds 110 and 120 may be installed in the main body 160 so as to be vertically disposed or disposed to the left and right, and either or all of the first and second molds 110 and 120 may be separated from each other by an actuator. The cavities 101 can be joined to each other to be hermetically closed.

At least one inclined core 130 may be provided on at least one side of the first and second molds 110 and 120 so as to form an undercut portion of the injection-molded article. The inclined core 130 may have a shape corresponding to the undercut portion forming part of the injection molded article on one side and the structure and the number thereof may be determined according to the structure and the number of the undercut portion in the injection molded article. As the injection-molded part is made of a multi-purpose fan, it can be arranged in a circular shape. Further, when the oblique core 130 is composed of a plurality of oblique cores 130, the oblique cores 130 are engaged with the other oblique cores 130 without any clearance before operation of the plate 150, do.

The inclined rod 140 may be rotatably installed on the plate 150 by an engaging portion 141 hinged by the engaging pin 141a. The inclined rod 140 is installed to pass through the through hole 121 formed in the second mold 120, for example. Here, the plate 150 moves so as to take out the injection-molded product molded by the cavity 101. When the first and second molds 110 and 120 are separated from each other, the inclined core 130 is guided by the guiding member (not shown), which is guided by the inclined rod 140 in the through hole 121 or separately, And can be rotated together with the inclined rod 140. Here, the guide member can be coupled to the second mold 120, for example, and can form an elevating groove inclined at a predetermined angle so that the inclined rod 140 can be raised and lowered.

12 and 13, the inclined core 130 has a first clearance C1 between itself and the inclined rod 140 in the first direction in which the injection-molded article 10 is released for removal, And a second clearance C2 between the inclined rod 140 and the inclined rod 140 in a second direction orthogonal to the first direction on the plane of the inclined rod 140. The third clearance C3 The inclined rod 140 is provided on the inclined rod 140 side. Here, the first direction may be the longitudinal direction of the tapered core 130, and may be, for example, the direction of operation of the tapered core 130 with respect to the tilt rod 140 (the "D" The second direction may be the width direction of the tapered core 130, and may be, for example, perpendicular to the first direction and perpendicular to the tapered rod 140.

The inclined core 130 can form an insertion hole 131 to be fitted so that the inclined rod 140 has the first and second clearances C1 and C2 and is formed on the outer surface of the inclined rod 140 And a support ring 143 provided at the end of the inclined rod 140 with a fixing bolt 144. The support ring 143 is formed of a synthetic resin, It is possible to provide the third clearance C3 between the step portion 142 and the support ring 143 so as to be separated from the inclined rod 140 by the inclined core 130 Can easily be assembled with the first to third clearances (C1, C2, C3) in the inclined rod 140. [

The first clearance C1, the second clearance C2 or the third clearance C3 may be 0.01 to 5 mm. If the slope distance is less than 0.01 mm, It is difficult to expect a rotation operation for interference avoidance with respect to the undercut portion of the injection molded article with respect to the inclined core 130. When the inclination core 130 is more than 5 mm in diameter, Which makes it difficult to engage or perform intrinsic motions between the inclined cores 130 for the sake of convenience. The size of the first clearance (C1), the second clearance (C2), or the third clearance (C3) may vary depending on the size and structure of the injection-molded article. To 5 mm.

The first and second molds 110 and 120, the inclined core 130 and the inclined rod 140 are installed in the main body 160 to form a plurality of injection molded parts. The first and second molds 110 and 120, the warp core 130 and the warp rods 140 are formed in the body 160 so that a plurality of injection molded parts can be molded simultaneously or temporally And may be arranged so as to correspond to each of the injection-molded parts of the main body 160. In the case of a plurality of the injection molding parts, for example, they may be arranged in a row in the main body 160 or may be arranged to be arranged two-

Hereinafter, the operation of the injection mold having the spiral-direction-operating inclined core according to the present invention will be described.

The first and second molds 110 and 120 and the inclined core 130 are coupled to each other and the cavity 101 is closed by the first and second molds 110 and 120 and the inclined core 130, (Not shown) in the closed state, resin is injected into the cavity 101 to form an injection-molded article having a certain shape to form an undercut portion. When the first and second molds 110 and 120 are coupled to each other, the inclined core 130 is brought into close contact with the undercut portion forming a part of the injection-molded product.

5, when the molding of the injection-molded product is completed, the injection-molded product is separated by a pin (not shown) while the first mold 110 is separated from the first mold 110 by the movement in the direction A, The oblique rod 140 is guided while moving in the C direction by the second mold 120 or the separate guide member (not shown) while moving in the direction C, and the oblique core 130 Is separated from the injection-molded article 10 by being retracted in the direction D, as shown in Fig.

7, the inclined surface 132 of the inclined core 130 interferes with the undercut portion 13 of the injection-molded article 10, so that the injection-molded article 10 has a center For example, in the Z-axis direction, about the rotation slope 132 of the oblique core 130 by about 3 degrees. 9 and 10, when the injection molded article 10 is rotated, the inclined core 130 causes the back contact 133 to interfere with the back surface of the injection molded article 10, and as shown in FIG. 11, The side contact portions 134 cause interference with the side surfaces of the injection molded article 10. [ In this interference, as shown in Figs. 12 and 13, the inclined core 130 has the first through third clearances C1, C2 and C3, respectively, with respect to the inclined rod 140, 3D rotation of the inclined core 130 is allowed and the rotation of the inclined core 130 caused by the 3D rotation of the inclined core 130 causes the injection molded product 10 to interfere with the undercut portion 13 132 so that the injection molded article 10 performs a 3D helical motion in the direction of the spiral curvature direction E formed by the vanes 11 as shown in Fig. 14, so that the injection molded article 10 can be easily taken out .

According to the injection mold of the present invention, when the injection-molded product having the complicated undercut portion such as the high-performance multi-blade fan is taken out, the inclined core can avoid interference with the undercut by allowing the 3D rotation Thereby facilitating the molding and production of an injection molded article such as a high-performance multi-blade fan having excellent slimness, durability and heat resistance.

Although the present invention has been described with reference to the accompanying drawings, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

10: injection-molded article 13:
101: cavity 110: first mold
120: second mold 121: through hole
130: Inclined core 131: Insertion hole
131a: latching jaw 132: rotation slope surface
133: back contact portion 134: side contact portion
140: inclined rod 141:
141a: coupling pin 142:
143: Support ring 144: Fixing bolt
150: Plate 160: Body
C1: first clearance C2: second clearance
C3: 3rd clearance

Claims (7)

First and second molds for forming a cavity for molding an injection-molded article by injection of resin;
An inclined core provided on one side of the first and second molds and forming a part of the cavity so as to form an undercut portion of the injection molded article; And
And a tilting rod coupled to the one end of the tilted core and installed on the tilting plate,
Wherein the warp core comprises:
The injection molded article having a first clearance between the inclined rod and the first inclined rod in a first direction in which the injection molded product is taken out for extraction and a second clearance between the inclined rod and the inclined rod in a second direction orthogonal to the first direction Wherein the inclined rod has a second clearance and is provided on the inclined rod so as to have a third clearance in a third direction that is the longitudinal direction of the inclined rod. The method according to claim 1,
Wherein the warp core comprises:
Wherein an inclined rod is formed on the inner side surface of the insertion hole so that the inclined rod has a first clearance and a second clearance so that the inclined rod is engaged with the stepped portion formed on the outer surface of the inclined rod, And a support ring provided at the end of the inclined rod to be separated from the inclined rod by the support ring and thereby to be movable by the third clearance between the step portion and the support ring, Injection mold with core. The method according to claim 1 or 2,
The first clearance
An injection mold having a helically oriented tilted core of 0.01 to 5 mm. The method according to claim 1 or 2,
The second clearance
An injection mold having a helically oriented tilted core of 0.01 to 5 mm. The method according to claim 1 or 2,
The third clearance
An injection mold having a helically oriented tilted core of 0.01 to 5 mm. The method according to claim 1 or 2,
The first direction is a direction
The longitudinal direction of the inclined core,
The second direction is a direction
And a spiral-actuated tilting core in the width direction of the tilted core. The method according to claim 1 or 2,
The first and second molds, the inclined core, and the ramp rods,
An injection mold having a plurality of spiral-actuated inclined cores, the plurality of injection molded articles being formed in the body.

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