KR101563313B1 - Injection Molding For Plastics Easy to Assemble And Disassemble - Google Patents

Abstract

The present invention relates to an injection mold, capable of being easily disassembled, for plastic materials. The injection mold includes: a nozzle locator including a resin moving path to which a plastic resin is supplied, a fixation groove, which is formed on an upper portion of the resin moving path and includes a screw thread formed on an inner circumferential side thereof, and a fixation part, which is formed to be extended from a lower end portion of the resin moving path and includes a screw thread formed on an outer circumferential side thereof; a resin supply cap including a resin supply hole, which communicates with the resin moving path, and a cap fixation part, which is formed on an outer circumferential side on a lower portion thereof and is joined to the fixation groove of the nozzle locator; a manifold which comprises an upper manifold, which is formed on an upper portion and includes a locator coupling groove to be coupled with the nozzle locator, and a lower manifold, which is formed on a lower portion and includes nozzle joining grooves to allow multiple nozzle assemblies to be joined thereto, and includes a manifold flow channel which transfers the plastic nozzle, supplied from the nozzle locator, to the nozzle assemblies; the nozzle assemblies which include second joining members, which are formed on an upper portion and are detachably joined to the nozzle joining grooves of the manifold, and discharges the plastic resin supplied from the manifold toward a gate of the mold; and first joining members which have upper portions, which are joined to the fixation part to connect the nozzle locator to the manifold to be able to be separated from each other.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an injection mold for plastic,

The present invention relates to an injection mold for plastic which is easy to disassemble. More particularly, the present invention relates to a nozzle type locator, a manifold, and a nozzle assembly, which are formed in both an open type injection mold and a valve type injection mold, It is possible to disassemble and assemble easily, and clean solid material of remaining plastic material can be removed, and plastic skin layer (plastic skin layer) can be eliminated on the wall surface of resin flow path, so that resin flow channel management and post management efficiency of plastic injection mold To an injection mold for plastic which can be easily decomposed.

Generally, an injection molding machine is provided with a manifold for injecting a raw material into a cylinder provided at one side and injecting the raw material into a mold in a molten state in a cylinder, and an upper mold has a plurality of cavities formed in a lower mold And a plurality of nozzles for injecting the raw material into the cavities of the lower mold are provided on the bottom surface of the manifold to fill the cavities with a high pressure. When the materials filled in the cavities are solidified, the upper mold and the lower mold are separated from each other So that the molded product is taken out

1 shows a valve-type injection molding apparatus according to the prior art.

As shown in the drawing, a valve-type injection molding apparatus according to the prior art has a cavity plate 102 into which a gate 112 to which a resin is supplied is laminated and fixed on the upper side of the cavity plate 102, A spacer plate 106 fixed to both sides of the upper surface of the reinforcing plate 104 and provided with a clamping plate 108 thereon, a reinforcing plate 104, A manifold 130 configured to be spaced apart from the spacer plates 106 with a predetermined space therebetween and having a manifold flow path 132 formed therein, a manifold 130 coupled to the manifolds, a reinforcing plate 104, and a clamping plate 108 And a nozzle locator 150 provided at an upper center of the manifold 130 and connected to the manifold flow path 132. The nozzle locator 150 has an injection port through which resin is injected.

The injection molding apparatus according to the related art has a structure in which a gate is opened and closed by a valve pin that performs an elevating operation by using an oil pressure or a pneumatic pressure as an operating pressure and includes a structure in which a multi- The injection pressure of each nozzle is difficult to maintain uniformly.

That is, the manifold 130 is formed with two or more branched resin flow paths for uniformly distributing and supplying resin to a plurality of nozzles. These resin flow paths are processed by using a tool, And the nozzles 120 coupled to the manifold 130 also require high dimensional accuracy. However, due to difficulty in processing and dimensional dispersion, the quality of the molded products is not uniform, have.

Particularly, when the injection molding is performed using plastic resin in an open type injection mold as well as an injection mold of valve type as described above, gas is generated in the resin flow path, There was a problem of corroding the surface.

In addition, after the plastic injection molding is performed, there is a problem that the quality of the injection molded article is deteriorated by the plastic solidification material remaining in the injection mold or the plastic skin layer remaining on the wall surface of the flow passage.

(Patent Document 1) Korean Published Patent Application No. 2009-0083251 (2009.08.03.)

(Patent Document 2) Utility Model No. 0265690 registered in the Republic of Korea (Feb.

In order to solve such problems, the present invention has been devised by the background art described above, and it is an object of the present invention to provide an open type injection mold and an open type injection mold for quickly removing gas generated during plastic molding, The present invention provides an injection mold for plastics which can be easily disassembled and assembled into a nozzle locator, a manifold, and a nozzle assembly which are configured in all of the valve type injection molds.

In addition, since the respective components of the plastic injection mold can be quickly and easily disassembled and assembled, the present invention can rapidly treat carbonization in the nozzle locator, the manifold and the nozzle assembly, It is possible to remove the plastic skin layer on the wall surface of the resin flow channel by cleaning the solidified material of the material, thereby providing an injection mold for plastic which can improve the resin flow path management and post management efficiency of the plastic injection mold It has its purpose.

It is also an object of the present invention to provide an injection mold for plastic which can prevent corrosion of the flow line by performing hard chrome plating on the surface of the resin flow path formed in the plastic injection mold.

According to an aspect of the present invention, there is provided an injection mold for plastic which is easy to disassemble, comprising: a resin transfer path to which a plastic resin is supplied; A nozzle locator including a fixing groove having an inner circumferential surface formed with a thread, a fixing portion extending from a lower end of the resin moving path and including a fixing portion formed on an outer circumferential surface thereof; A resin supply cap in which a resin supply hole communicating with the resin transfer path is formed and a cap fixing portion formed on a lower outer circumferential surface and coupled to a fixing groove of the nozzle locator; And a lower manifold having a nozzle coupling groove formed therein so as to couple a plurality of nozzle assemblies to the lower manifold, wherein the plastic resin supplied from the nozzle locator is divided into a plurality of nozzles, A manifold having a manifold flow path for moving toward the assembly side and a fastening portion for fastening the fastening means to both sides; Upper and lower fixing plates fastened to upper and lower portions of the manifold, respectively, and fastened to the fastening portions; And a second coupling member detachably coupled to the nozzle coupling groove of the manifold at an upper portion thereof; a nozzle assembly for discharging the plastic resin introduced from the manifold to the gate side of the mold; And a first engaging member coupled to the fixed portion to connect the nozzle locator and the manifold, wherein the first engaging member is detachably coupled to the nozzle locator.

According to an embodiment of the present invention, the manifold, the upper and lower fixing plates are provided with a plurality of fastening holes to which the fastening means is fastened so as to maintain the fastened state, respectively, and upper and lower fastening And a ball is formed.

According to an embodiment of the present invention, the manifold may function as a space block, and the upper and lower manifolds may be coupled to and separated from the upper and lower fixing plates, respectively, And is structured such that it is wetted by the injection mold clamping force, so that the manifold flow path can be easily cleaned.

According to an embodiment of the present invention, the first engagement member may include a locator engagement groove to which the fixing portion of the nozzle locator is coupled, a seat cushion formed at a lower end of the locator engagement groove, And a first fastening part having a first screw thread formed on an outer circumferential surface thereof to be detachably coupled to the manifold.

According to an embodiment of the present invention, the first engagement member is further formed with a hermetic member formed at an upper portion of the locator engagement groove to prevent the plastic resin from leaking out and further improve the engagement force .

According to an embodiment of the present invention, the upper manifold includes an upper manifold flow path forming an upper portion of the manifold flow path, And a locator fastening groove to be fastened.

According to an embodiment of the present invention, the lower manifold includes a lower manifold flow path forming a lower portion of the manifold flow path, and a nozzle coupling groove in which the second coupling member is coupled to both sides of the lower manifold flow path. .

According to an embodiment of the present invention, the surface of the resin channels formed in the nozzle locator, the manifold, and the nozzle assembly may further include a plating layer formed of hard chrome plating.

According to an embodiment of the present invention, the plastic injection mold may be any one of an open type injection mold and a valve type injection mold, or both .

According to the embodiment of the present invention, since the nozzle locator, the manifold and the nozzle assembly of the plastic injection mold can be easily disassembled and assembled, the gas generated during plastic molding can be quickly removed, Corrosion of the surface can be prevented.

In addition, according to the embodiment of the present invention, since each component of the plastic injection mold can be quickly and easily disassembled and assembled, the nozzle locator, the manifold and the nozzle assembly can be quickly treated when carbonization occurs.

Further, according to the embodiment of the present invention, it is possible to clean the remaining solidified material of the plastic material, thereby eliminating the plastic skin layer on the wall surface of the resin flow path, Management efficiency can be improved.

Further, according to the embodiment of the present invention, by performing hard chromium plating on the surface of the resin flow path formed in the plastic injection mold, the corrosion of the flow path can be prevented.

1 shows an injection molding apparatus according to the prior art,
2 and 3 are sectional views schematically showing an open type injection mold for plastic according to a preferred embodiment of the present invention,
4 is a perspective view showing an open type injection mold for plastic according to a preferred embodiment of the present invention,
5A and 5B are views showing a manifold of an open type injection mold for plastic according to a preferred embodiment of the present invention,
6 is a view illustrating a state in which the respective components of the open type plastic injection mold according to the preferred embodiment of the present invention are coupled,
FIGS. 7 and 8 are views showing a valve-type injection mold for plastic according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

2 and 3 are cross-sectional views schematically showing an open-type injection mold for plastic according to a preferred embodiment of the present invention, FIG. 4 is a perspective view of an open-type injection mold for plastic according to a preferred embodiment of the present invention, FIG. 5B is a view illustrating a manifold of an open type injection mold for plastic according to a preferred embodiment of the present invention. FIG. 6 is a cross-sectional view of an open type injection mold for plastic according to a preferred embodiment of the present invention, FIGS. 7 and 8 are views showing a valve-type plastic injection mold according to a preferred embodiment of the present invention.

The injection molding machine for plastic according to the present invention comprises a nozzle locator 210 for supplying the inside of an injection molding apparatus while maintaining the melting temperature of a plastic resin so that molding of a plastic article is performed, A plurality of nozzle assemblies 230 installed in the manifold 220 and discharging the plastic resin supplied to the gates 112 by supplying the plastic resin to the nozzle assemblies 210, A resin supply cap 250 for supplying a plastic resin and a first and a second engagement members 310 and 310 for detachably coupling the nozzle locator 210, the manifold 220, and the nozzle assembly 230, respectively, , 320).

The nozzle locator 210 is formed so as to pass through the inside of the nozzle locator 210 from the upper side to the lower side and a resin transfer path 212 for supplying a plastic resin to the manifold 220 side is formed, A fixing groove 216 having threads formed along the inner circumferential surface thereof is formed so as to be detachably coupled with the fixing groove 250.

On the other hand, the resin supply cap 250 described above is formed by hardening the surface of the resin supply cap 250 through a high frequency heat treatment. A resin supply hole 254 communicating with the resin transfer path 212 is formed through the inner circumference of the resin supply cap 250. 250 is formed with an injection path 212 through which a plastic resin is injected.

The resin supply cap 250 may have a cap fixing portion 256 formed of a predetermined thread along the outer circumferential surface thereof so as to be detachably fastened to the fixing groove 216 formed in the nozzle locator 210.

The nozzle locator 210 further includes a fixing portion 218 formed to extend downward at the lower end of the resin moving path 212 and having a thread formed on the outer circumferential surface thereof so as to be removably fastened to the manifold 220 .

It is a matter of course that the fixing portion 218 has the same diameter as that of the resin transfer path 212 and further has a connection hole for connecting the resin transfer path 212 and the manifold flow path 222.

The fixing portion 218 of the nozzle locator 210 may be detachably coupled to the manifold 220. However, the present invention is not limited thereto and may be connected to the manifold 220 through a first coupling portion 310 Of course it is.

The first engaging member 310 is detachably coupled to the fixing portion 218 formed at the lower end of the nozzle locator 210 and the lower portion is detachably coupled to the manifold 220 to connect the nozzle locator 210 The manifold 220 can be tightly coupled with each other and can be easily separated.

The locator coupling groove 312 is formed in the first coupling member 310 such that the fixing portion 218 of the nozzle locator 210 is coupled by fastening. And a seating jaw on which the tip end of the nozzle locator 218 is seated is further provided, so that the nozzle locator 210 is tightly coupled.

A first fastening portion 314 is detachably coupled to the manifold 220 at the lower portion of the first fastening portion 310. A first thread 314a is provided on the outer circumferential surface of the first fastening portion 314, So that the locator fastening groove 224b of the manifold 220 is detachably fastened.

In order to prevent the plastic resin from leaking out and to further improve the bonding force, the first coupling member 310 is provided with a hermetic member 316 made of a rubber material having a predetermined elasticity, do.

The manifold 220 is detachably coupled to the nozzle locator 210 and a manifold channel 222 is formed to allow the plastic resin supplied from the nozzle locator 210 to move toward the nozzle assembly 230.

The manifold 220 quickly removes the gas generated during the plastic molding and removes the solidified plastic material remaining in the manifold channel 222, Is divided into a lower manifold 226 and has a shape of "H beam"

The upper manifold 224 is formed with an upper manifold flow path 224a forming an upper portion of the manifold flow path 222. The lower portion communicates with the upper manifold flow path 224a at an upper portion at the center, 1 locator fastening groove 224b to which the first fastening portion 314 of the fastening member 310 is detachably fastened is formed.

The lower manifold 226 is formed with a lower manifold flow path 226a forming a lower portion of the manifold flow path 222. A nozzle assembly 230 is detachably coupled to both sides of the lower manifold flow path 226b A nozzle engaging groove 226b is formed in which the second engaging member 320 formed on the nozzle assembly 230 is engaged.

The manifold 220 of the present invention is constituted by a fastening part configured to be fastened to both the upper fastening plate 420 and the lower fastening plate 430 on both sides thereof and the fastening part is fastened to the fastening part by a fastening means such as a bolt 224c, and 226c are formed in the upper manifold 224 and the lower manifold 226, respectively.

The upper fixing plate 420 and the lower fixing plate 430 coupled to the manifold 220 are provided with upper coupling holes 422 and lower coupling holes 422 having the same center as the coupling holes 224c and 226c formed in the manifold 220, A fastening hole 432 is formed.

That is, in the manifold 220 of the present invention, the upper manifold 224 and the lower manifold 226 are coupled to and separated from the upper and lower fixing plates 420 and 430, respectively, The lower manifolds 224 and 226 are formed of a structure that is adapted to be welded by the injector mold clamping force without applying a normal spacer block and are fixed by a clamping force generated by fastening between the upper and lower clamping plates 420 and 430 .

The manifold 220 is configured to facilitate the cleaning of the manifold channel 222 after the completion of the injection molding and releases the engagement of the upper and lower fixing plates 420 and 430 to separate the manifold 220 The separation of the manifold channel 222 can be simplified so that the quick and easy cleaning operation of the manifold channel 222 and the maintenance and repair of the manifold 220 can be facilitated.

When an excessive pressure is transmitted to the upper and lower fixing plates 420 and 430 and the manifold 220 during injection molding, a separate spacer block may be connected to the upper and lower fixing plates 420 and 430, The upper and lower block fixing holes 424 and 434 are formed to be inserted and fixed between the fastening portions of the fold 220.

The manifold 220 of the present invention having the above-described structure forms the resin guide portions R1 and R2 at portions where the horizontal path and the vertical path of the manifold flow path 222 are orthogonal to each other, , The residual rate of the plastic resin in the manifold flow path 222 can be minimized.

That is, the conventional manifold 220 is constructed such that the upper and lower manifolds 224 and 226 are integrally formed, and the portions where the horizontal and vertical directions of the manifold flow path 222 are orthogonal to each other are formed in a right angle Or the resin guide portion R1 is formed only in the upper manifold flow path 224a formed in the upper manifold 224. [

Accordingly, there is a problem that the plastic resin remains in the orthogonal portion of the lower manifold flow path 226a formed on the lower manifold 226 side, and solidified material of plastic material is generated. However, in the present invention, the upper and lower manifolds 224 The resin guide portions R1 and R2 can be formed on the upper and lower manifold passages 224a and 226a to minimize the remaining ratio of the plastic resin and prevent the generation of solidified materials It will be possible.

The nozzle assembly 230 is in communication with the manifold passage 222 and is formed with a second engaging member 320 which is detachably coupled to the nozzle engaging groove 226b of the manifold 220. [

The nozzle assembly 230 is configured to discharge the plastic resin injected from the manifold passage 222 to the gate side of the mold and to prevent heat loss of the plastic resin from being generated.

Meanwhile, the plastic injection mold of the present invention is characterized in that the surface of the resin flow path including the resin discharge path formed in the resin transfer path 212, the manifold path 222, and the nozzle assembly 230 constituting each component is hard chrome plated It is of course possible to prevent corrosion of the flow line.

In addition, since the plastic injection mold of the present invention can quickly and easily separate and combine the components, the plastic injection is completed, and then the decomposition operation is performed to check the state of the hard chromium plating of the resin flow channel in real time. As a matter of course, the cleaning operation can be carried out, so that a high-quality injection-molded product can be provided.

7 and 8, the injection mold of the valve type includes a nozzle locator 210 having a resin supply cap 250 and a manifold 220 The manifold 220 is divided into upper and lower manifolds 224 and 226 and the lower manifold 226 is connected to the lower end of the nozzle assembly 230 2 coupling member 320 may be detachably coupled to the nozzle coupling groove 226b.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. And all terms including technical and scientific terms are to be construed in a manner generally known to one of ordinary skill in the art to which this invention belongs, It has the same meaning as understood.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

210: Nozzle locator 216: Fixing groove
218: Fixing portion 220: Manifold
222: Manifold flow path 224: Upper manifold
226: lower manifold 228: buried groove
230: nozzle assembly 240: landfill heater
242: heating wire member 244: embedding member
250: resin supply cap 252: injection path
254: resin supply hole 256: cap fixing portion
310: first coupling member 312: locator coupling groove
320: second coupling member

Claims (9)

In an injection mold for plastic which is easily disassembled,
A resin transfer path to which a plastic resin is supplied; a fixing groove formed on an upper surface of the resin transfer path and having a thread on an inner circumferential surface; and a fixing portion extending from a lower end of the resin transfer path, Nozzle locator;
A resin supply cap in which a resin supply hole communicating with the resin transfer path is formed and a cap fixing portion formed on a lower outer circumferential surface and coupled to a fixing groove of the nozzle locator;
And a lower manifold having a nozzle coupling groove formed therein so as to couple a plurality of nozzle assemblies to the lower manifold, wherein the plastic resin supplied from the nozzle locator is divided into a plurality of nozzles, A manifold flow path for moving the manifold flow path to the assembly side and a fastening section for fastening the fastening means to both sides of the manifold flow path;
Upper and lower fixing plates fastened to upper and lower portions of the manifold, respectively, and fastened to the fastening portions;
And a second engaging member detachably coupled to the nozzle engaging groove of the manifold in the upper portion thereof; And
A first coupling member coupled to the fixed portion and having an upper portion coupled to the nozzle locator and the manifold, wherein the first coupling member is detachably coupled to the nozzle locator;
And an injection mold for injection molding.
The method according to claim 1,
Wherein the manifold and the upper and lower fixing plates are formed with a plurality of fastening holes for fastening the fastening means to maintain the fastened state and upper and lower fastening holes having the same center as the fastening holes, Injection mold for plastic.
The method according to claim 1,
The manifold is formed to be large and large so that the upper and lower manifolds are coupled to and separated from each other in a state of being fastened to the upper and lower fixing plates so as to function as a space block and support the space, Wherein the manifold flow path is easily cleaned.

The method according to claim 1,
The first engagement member
A locator engagement groove to which the fixing portion of the nozzle locator is coupled,
A seating jaw which is formed at a lower end of the locator coupling groove and on which the tip of the fixing portion is seated,
A first fastening part having a first screw thread formed on an outer circumferential surface thereof to be detachably coupled to the manifold,
And an injection mold for injection molding.
5. The method of claim 4,
Wherein the first engagement member is formed at an upper portion of the locator engagement groove to prevent the plastic resin from flowing out, and furthermore, a hermetic member that further improves the engagement force.
The method according to claim 1,
The upper manifold may include an upper manifold flow path forming an upper portion of the manifold flow path and a locator fastening groove formed at an upper center portion thereof to fasten the first engaging member to be detachably coupled to the nozzle locator Which is easy to disassemble.
The method according to claim 1,
Wherein the lower manifold further includes a lower manifold flow path forming a lower portion of the manifold flow path and a nozzle coupling groove through which the second engagement member is coupled to both sides of the lower manifold flow path, Injection mold.
The method according to claim 1,
Wherein a plated layer made of hard chrome plating is further formed on the surfaces of the resin flow paths formed in the nozzle locator, the manifold, and the nozzle assembly, respectively.
The method according to claim 1,
Wherein the plastic injection mold comprises one of an open type injection mold or a valve type injection mold, or both of the injection mold and the valve type injection mold.

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