KR101958669B1 - A nozzle for injection molding apparatus - Google Patents

Abstract

The present invention relates to a nozzle for an injection molding machine, comprising: a nozzle body extending in one direction and having an injection hole at a free end; A nozzle liner which is coupled to the nozzle body along a longitudinal direction of the nozzle body and forms a resin flow path that is a path of movement of the molten resin through an interior opened in the longitudinal direction; An out tip coupled to a longitudinal end of the nozzle liner so that the resin flow path extends to the injection hole; A valve pin which ascends and descends within the nozzle liner and the out tip to open and close the injection hole to interrupt the valve pin; And a pin coupling hole having a size corresponding to the outer diameter of the valve pin is formed in the longitudinal direction so as to be seated in the inside of the out tip, thereby guiding the up / down movement of the valve pin by supporting the out tip, The in tip which suppresses the rolling and pitching flow with respect to the axis center of the valve pin and forms a through hole in the out tip direction so as to provide an outflow path of the molten resin between the resin flow path and the injection hole; Thereby to reduce the residence time and the injection pressure of the molten resin when restricting the end of the valve pin and guiding the upward and downward movement of the valve pin, thereby providing a nozzle of an injection molding machine.
According to the present invention, it is possible to reduce the breakage of the valve pin and the injection hole and to open and close the nozzle more reliably by guiding the upward and downward movement of the end of the valve pin, So that the angle of refraction of the bathtub formed by the in tip and the out tip does not deviate largely from the direction of injection and the width of the bathtub can be kept constant and the melted It is possible to reduce the residence time of the resin and the injection pressure accordingly.

Description

[0001] The present invention relates to a nozzle for an injection molding apparatus,

The present invention relates to a nozzle for an injection molding machine.

In general, injection molding is one of the plastic molding methods, and is a method of molding a thermoplastic resin (thermoplastic resin) and a thermosetting resin (thermosetting resin). For such injection molding, a molding material is heated and melted in an injection cylinder of a molding machine, fluidized, and pressed into a tightly closed mold by an extrusion plunger or screw, and solidified or cured to obtain a molded article. It is suitable for mass production of complex shape products, and is the main method of forming with extrusion molding.

Thermoplastic resin is the most common molding material, but most of all molding materials such as thermosetting resin, rubber, and foam molding materials have been used in recent years. In addition, development of various processing machines considering the kind thereof, .

In recent years, an injection molding system using a gate valve has been applied. In the injection molding system to which a gate valve is applied, a gate valve is provided in a top shape corresponding to a cavity between a top mold and a bottom mold.

In Korean Patent Laid-Open Publication No. 10-2009-0094597, (Publication Date: September 08, 2009, Hyundai Motor Company), entitled "Gate Valve for Injection Molding", an injection molding system .

1, the above-described gate valve 1 is provided with a manifold 3 for forming a resin inlet port 5 so that the molten resin supplied from the resin injector flows, and the manifold 3 Is provided with a nozzle 7 in which a connecting passage 9 is formed so that molten resin flowing through the resin inlet 5 is filled.

A valve tip 11 having an injection orifice 13 connected to the connection passage 9 for injecting molten resin is mounted in a lower portion of the connection passage 9 of the nozzle 7, A valve pin 15 for selectively opening and closing the injection orifice 13 according to the operation of the piston is mounted.

At this time, the end of the valve pin 15 constituted by the free ends is guided by a guider (not shown) having a plurality of resin passages (not shown) as a communication path of the molten resin in order to reduce the flow in the direction transverse to the longitudinal direction The opening and closing of the injection nozzle 13 is facilitated to improve the quality of the product, and the end of the valve pin 15 is guided by the injection / Thereby preventing the nozzle 13 from abrading due to contact with the nozzle 13.

However, in the above-described conventional technique, since the guider 20 is seated in the valve tip 11, the path is interrupted by the refracting surface into which the resin passage is led to the inside of the valve tip 11, There is a problem that the residence time of the resin in the nozzle is increased and the quality of the molten resin to be injected is uneven due to the narrow space in which the molten resin which is divided and moved by the plurality of resin passages can be gathered again .

Korean Patent Publication No. 10-2009-0094597, (Publication Date: September 08, 2009, Hyundai Motor Co., Ltd.), title of invention: Gate valve for injection molding

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a nozzle of an injection molding machine for reducing the residence time and the injection pressure of molten resin when restricting the end of the valve pin and guiding the up- It has its purpose.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus and method for controlling the same.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a nozzle for an injection molding machine, comprising: a nozzle body extending in one direction; A nozzle liner which is coupled to the nozzle body along a longitudinal direction of the nozzle body and forms a resin flow path that is a path of movement of the molten resin through an interior opened in the longitudinal direction; An out tip coupled to a longitudinal end of the nozzle liner so that the resin flow path extends to the injection hole; A valve pin which ascends and descends within the nozzle liner and the out tip to open and close the injection hole to interrupt the valve pin; And a resin inflow path formed in a hollow shape for extending the resin flow path, the resin inflow path having a size corresponding to the outer diameter of the valve pin, the resin inflow path communicating with the injection hole, A binding hole is formed in the longitudinal direction to support the out tip to guide the upward and downward movement of the valve pin to suppress rolling and pitching flow with respect to the axial center of the valve pin, Wherein the inlets are formed with through holes to provide an outflow path of the molten resin between the resin flow paths and the injection holes and the lower ends of the inlets are spaced apart from the injection holes by a predetermined distance, And an end of the hole is formed to be in contact with the inner circumferential surface of the outtip when the through hole is formed to penetrate the outtip direction.

The out tip is made of a material having a low thermal conductivity and extends from the end of the nozzle liner to the vicinity of the injection hole so that the melted resin around the injection hole can be kept warm.

In addition, when the in-hole penetrating hole is formed so as to penetrate in the out-tip direction, the end of the hole may be formed to be adjacent to the inner circumferential surface of the out-tip.

The in-tip may be formed in such a shape that the outer radius gradually decreases from the in-through hole to the injection hole direction.

Also, the in-hop may have a ditch-shaped through-flow groove formed in the injection hole direction from the end of the in-through hole, so that the molten resin flowing through the in-through hole may be guided in the injection hole direction.

The solution of the above-mentioned problems is merely illustrative and should not be construed as limiting the present invention. In addition to the exemplary embodiments described above, there may be additional embodiments described in the drawings and the detailed description of the invention.

As described above, the present invention has the following effects.

First, guiding the upward and downward movement of the end of the valve pin by binding the end of the valve pin can reduce the breakage of the valve pin and the injection hole, and also make it possible to open and close the nozzle more reliably.

Second, the in-tip is placed on the top of the out-tip so that the in-tip is spaced from the injection hole by a predetermined distance, and the refraction angle of the path formed by the in tip and the out tip does not deviate greatly from the injection direction. It is possible to reduce the residence time of the molten resin and the injection pressure accordingly.

Thirdly, since the in tip is spaced apart from the injection hole by a predetermined distance, the molten resin divided between the in-tip and the injection hole provides a space for the molten resin to be gathered together, so that the injection amount of the molten resin injected through the injection hole can be maintained , It is possible to reduce the residual stress of the molten resin injected by lowering the injection pressure and to provide injection molded articles of higher quality.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a view showing a configuration of a conventional injection molding machine assembly.
2 is a side cross-sectional view illustrating an internal configuration of an injection molding machine nozzle according to an embodiment of the present invention.
3 is an exploded perspective view showing an internal configuration of an injection molding machine nozzle according to one embodiment of the present invention.
4 is a use state diagram for explaining a constitution principle of an injection molding machine nozzle according to an embodiment of the present invention.
5 is a partially enlarged view showing a configuration of various types of in-through holes according to another embodiment of the present invention.
6 is a partial enlarged view showing a structure of a through-flow outlet groove according to another embodiment of the present invention.

The preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, in which the technical parts already known will be omitted or compressed for simplicity of explanation.

FIG. 2 is a side sectional view showing an internal configuration of an injection molding machine nozzle according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view showing an internal configuration of an injection molding machine nozzle according to an embodiment of the present invention.

2 and 3, the injection molding machine nozzle 100 of the present invention binds the end of the valve pin 150 to guide the upward and downward movement of the valve pin 150, The nozzle liner 120, the out tip 130, the in tip 140, and the valve pin (not shown) by reducing the stagnation and injection pressure of the molten resin to be injected, 150).

The nozzle body 110 is provided in a hollow shape in its longitudinal direction and has one end as a fixed end coupled with the manifold to receive molten resin from a manifold (not shown) And is provided with a free end formed with an injection hole 111 so that the resin can be injected.

The nozzle liner 120 is coupled along the inner surface of the nozzle body 110 and has a hollow shape along the longitudinal direction similar to the structure of the nozzle body 110 so as to be a moving path of the molten resin supplied from the manifold So that the resin flow path 121 is formed.

The nozzle liner 120 is also provided with a fixed end at one end coupled with the manifold and an open end at the other end. The liner thread 122 for coupling with the out tip 130, which will be described later, .

The out tip 130 is coupled to the free end of the nozzle liner 120 in a hollow form so that the resin flow path 121 formed by the hollow interior of the nozzle liner 120 extends to the injection hole 111 So that the inner radius of the injection hole 111 becomes narrower toward the injection hole 111, so that the molten resin is directed to the injection hole 111.

At this time, an out tip thread 131 corresponding to the liner thread 122 described above is formed on the outer circumference of the upper part of the out tip 130 so that the out tip 130 and the nozzle liner 120 are screwed together, 130 are formed to be narrower than the radius of the resin flow path 121 of the nozzle liner 120 so as to be coupled to the nozzle liner 120 so that the out tip 130 contacts the resin flow path 121 of the nozzle liner 120 To form a protruding structure.

Here, the protruding portion serves as a seating jaw 132 for allowing the holding jaw 141 of the in-tip 140, which will be described later, to be seated.

The in tip 140 is a guider which is seated on the inner periphery of the out tip 130 and guides the upward and downward movement of the valve pin 150 for interrupting the opening and closing of the injection hole 111 to be described later. ).

The upper end A of the in tip 140 is formed with a locking protrusion 141 whose outer circumferential surface protrudes in a direction transverse to the longitudinal direction of the in tip 140, And a hollow resin inflow path 142 is formed at the inner center of the nozzle liner 120 to extend the resin flow path 121 in the longitudinal direction. That is, the radius of the resin inflow passage 142 is formed to be larger than the outer radius of the valve pin 150.

The lower portion B is provided with a pin which communicates the resin inflow passage 142 with the injection hole 111 with a radius smaller than the radius of the resin inflow passage 142, that is, A binding hole 143 is formed along the longitudinal direction to bind the valve pin 150 to guide the upward and downward movement of the valve pin 150.

The upper portion A of the in tip 140 is provided to have an outer radius equal to the inner radius of the out tip 130 so as to be brought into close contact with the inner circumferential surface of the out tip 130 and the lower portion B of the in tip 140 Hole which is formed to have a radius larger than the radius of the pin binding hole 143 but smaller than the outer radius of the upper portion A and which communicates with the space formed by the resin inflow passage 142 and the inner periphery of the out tip 130 144 are formed in a slanting line in the direction of the outt tip 130 so that the melted resin supplied through the resin inflow path 142 is directed to the injection hole 111 through the inside of the outt tip 130. [

In this case, the in-hole penetration hole 144 is formed not in the vertical direction from the upper portion A to the lower portion B of the in-tip 140, but in a diagonal line direction from the resin passage 121 to the out tip 130 So that the movement path of the molten resin can be prevented from being greatly refracted. That is, if the inhift through hole 144 is formed in the vertical direction, the lower portion of the inhift through hole 144 may not be formed with a refracted portion, but a large refraction occurs at the upper portion of the inhift through hole 144, And the residence time in the nozzle 100 of the molten resin is increased. Therefore, in order that the refracted portions are slightly refracted to form a streamlined structure, (144) is provided in an oblique direction in the direction of the out tip (130).

4 is a use state diagram for explaining a constitution principle of an injection molding machine nozzle according to an embodiment of the present invention.

4, the constitution principle of the injection molding machine nozzle 100 of the present invention will be described. In order to provide the structure of the in-tip 140 in the resin flow path 121, the resin flow path 121 Is formed through screwing of the nozzle liner 120 and the out tip 130.

At this time, the out tip 130 is drawn into and screwed into the nozzle liner 120 so that the injection pressure applied to the end of the nozzle 100 is transmitted and absorbed along the longitudinal direction of the nozzle liner 120, It is possible to prevent the out tip 130 from being separated from the nozzle liner 120 by using the structure of the seating jaw 132 of the out tip 130 protruding from the inner periphery of the nozzle liner 120, 132 to be received and installed.

Herein, the in tip 140 is configured to be seated on the top tip 130 rather than being coupled to the out tip 130 or the nozzle liner 120, so that the downward movement of the valve pin 150 causes the valve pin 150 The influence of the load of the valve pin 150 is compensated for by the moving pressure of the molten resin injected at a high pressure The in tip 140 of the present invention can be installed only on the top of the out tip 130 without a separate coupling structure so that the in tip 140 can be easily manufactured and assembled .

In addition, by guiding the operation of the valve pin 150 through the pin binding hole 143 of the in-tip 140, it is possible to perform an opening / closing operation of the injection molding machine with higher reliability, It is possible to reduce the wear and breakage of the peripheral portion of the base 111.

However, since the movement path of the molten resin is inevitably interfered with through the structure of the in-tip 140 formed in the direction opposing the resin path 121 in order to bind the valve pin 150, 121 may be formed at the tip of the out tip 130 so that the resin flow path 121 and the resin flow path 121 of the out tip 130 can communicate with each other.

At this time, the in-hole through-holes 144 are formed in a slanting line in the direction of the out-tip 130 from the end of the resin inflow path 142, so that the respective bent portions can be streamlined, So that a dead zone due to the seating structure of the out tip 130 and the in tip 140 is prevented from occurring.

The lower portion B of the in tip 140 is formed to have a narrower width from the end of the in tip through hole 144 toward the injection hole 111. The narrowing ratio is a radius of the out tip 130 So that it is formed to correspond to the narrowing ratio of the size.

The width of the resin inflow passage 142 and the through hole 144 around the valve pin 150 and the width of the outer circumferential surface of the lower portion B of the in tip 140 and the inner circumferential surface of the out tip 130 The width of the resin flow paths 121 may be the same or similar, and may be realized in a streamlined manner so that the moving molten resin is guided to the injection holes 111 without interference or irregularity, It is possible to reduce the staying time and to reduce the residual stress due to the injection pressure.

In addition, as described above, the upper portion A of the in tip 140 is seated on the upper portion of the out tip 130 to support the upper portion of the out tip 130, And may be spaced apart from the hole 111 at a predetermined interval. The molten resin which is divided and moved by the intelthrough hole 144 joins again in the confluence space JS of the periphery of the injection hole 111 and is injected into the injection hole 111 by the same pressure, It is possible to inject different pressures of the resin to be injected at one and the same pressure by the constitution of the in tip 140 performing the binding and guiding function of the resin 150 by dividing and moving the molten resin.

In addition, it is needless to say that the out tip 130 may be made of a material having a low thermal conductivity so as to heat the periphery of the injection hole 111, in which it is difficult to install the heater or the heating coil, .

FIG. 5 is a partially enlarged view showing a structure of various types of in-through holes according to another embodiment of the present invention, and FIG. 6 is a partially enlarged view showing a structure of a through-flow outlet groove according to another embodiment of the present invention .

As shown in FIG. 5A, the in-hole through-hole 144 in the other embodiment of the present invention is formed in a plurality of two or more than two in-hole through holes 144 shown in FIGS. .

At this time, a plurality of in-hole through holes 144 may be formed in a symmetrical structure, or an even number of in-hole through holes 144 may be formed to have a predetermined spacing even if they are not symmetrical Of course it is.

In addition, as shown in FIG. 5B, a plurality of in-via holes 144 may be formed in an elliptical shape along the outer peripheral surface of the in-tip 140. When formed in an elliptical shape, it is also preferable that they are formed at regular intervals. In this way, a large-capacity injection can be achieved as compared with the circular in-hole through-hole 144.

Although the in-tip 140 of the present invention is formed in a cylindrical shape, it is preferable that a plurality of circular or elliptical in-hole through holes 144 are formed along the circumference, but it is difficult to manufacture, But may be suitably formed according to the purpose.

Further, as shown in FIG. 6, a ditch-shaped through-flow outlet groove 145 formed in the injection direction may be formed at the end of the in-through hole 144.

In order to secure the rigidity according to the supporting force required when manufacturing the in-tip 140, it is preferable that the in-tip 140 is formed to have a certain thickness or more. Accordingly, the in-hole through hole 144 must be formed to have a certain length, and the amount of the molten resin moved along the radius of the in-through hole 144 must be limited.

Therefore, if the through-flow outflow groove 145 formed in an oblique shape is formed in the direction of injection, that is, in the direction of the injection hole 111, at the end or end of the in-through hole 144, And the width of the outlet portion of the intelthrough hole 144 may be formed to be as long as it is.

This also reduces the residence time of the molten resin moving in the nozzle 100 and improves the quality of the molded product by removing the residual stress of the molten resin generated by the injection pressure.

In addition, considering the fact that the vicinity of the bottom of the through hole 144 is a blind spot formed inside the movement path of the molten resin, the effect of reducing the blind spot described above through the structure of the through- .

It is needless to say that the structure of the through-flow outflow groove 145 may be applied to the elliptic through-hole 144 illustrated in FIG.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. And the scope of the present invention should be understood as the scope of the following claims and their equivalents.

100: Nozzle for injection molding machine
110: nozzle body
111: Injection hole
120: nozzle liner
121: resin flow path
122: Liner thread
130: Out tips
131: Out Tip Threaded
132: seating chin
140: InTip
141:
142: resin inflow path
143: pin binding hole
144: In-through hole
145: Through-flow outlet groove
150: Valve pin
A: In-tip top B: In-bottom bottom
JS: Joining space

Claims (5)

A nozzle body extending in one direction and having an injection hole at a free end;
A nozzle liner which is coupled to the nozzle body along a longitudinal direction of the nozzle body and forms a resin flow path that is a path of movement of the molten resin through an interior opened in the longitudinal direction;
An out tip coupled to a longitudinal end of the nozzle liner so that the resin flow path extends to the injection hole;
A valve pin which ascends and descends within the nozzle liner and the out tip to open and close the injection hole to interrupt the valve pin; And
A resin inflow path formed in a hollow shape for extending the resin flow path, the resin inflow path having a size corresponding to the outer diameter of the valve pin, the resin inflow path communicating with the injection hole, Holes are formed in the longitudinal direction to support the out tip to guide the upward and downward movement of the valve pin to suppress rolling and pitching flow with respect to the axial center of the valve pin, And a in tip provided with a hole to provide a flow path of molten resin between the resin flow path and the injection hole and having a lower end spaced apart from the injection hole by a predetermined distance,
The in-
And an end of the hole is formed to be in contact with the inner circumferential surface of the outtip when the through hole is formed to penetrate the outtip direction.
Nozzle for injection molding machine. The method according to claim 1,
The out-
And the molten resin in the periphery of the injection hole is kept warm by being extended from the end of the nozzle liner to the vicinity of the injection hole.
Nozzle for injection molding machine. delete The method according to claim 1,
The in-
And the outer radius gradually decreases from the in-through hole to the injection hole.
Nozzle for injection molding machine. The method according to claim 1,
The in-
Wherein a through-flow outlet groove is formed in the injection hole direction from an end of the in-hole through hole so that the molten resin flowing through the in-through hole is guided in the injection hole direction
Nozzle for injection molding machine.

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