KR20210044994A - Injection mold device - Google Patents

Abstract

An injection mold device according to the present embodiment includes: a fixed core having an injection groove corresponding to a shape of one side of an injection product; a movable core provided to be movably engaged with the fixed core and provided with the injection groove corresponding to the shape of the other side of the injection product; a robot arm installed so as to be able to enter and exit the space between the fixed core and the movable core; and a thermal jig that is provided in the robot arm and presses the protrusion formed on the injection product seated on one of the fixed core and the movable core to a high temperature. The present invention can improve the quality of the injection product even if the continuous injection process is performed.

Description

Injection mold device}

The present invention relates to an injection mold apparatus capable of removing a protrusion of an injection product immediately before taking the injection product out of the mold.

Methods of manufacturing articles using synthetic resins such as plastic as raw materials include injection molding using an injection mold, vacuum molding using air suction, and blow molding formed by air blow.

The injection molding method can be performed by an injection mold apparatus, and the injection mold apparatus is a device for manufacturing an injection product by injecting a molten resin or the like into a cavity in a mold and then cooling the molten resin in the mold in the mold.

The injection mold apparatus includes a mold in which a cavity having the same shape as an injection product to be manufactured is formed, and an injection molding machine for injecting a molten resin into the cavity. The mold may include a fixed mold and a movable mold that is coupled to or separated from the fixed mold, and a cavity may be formed between the fixed mold and the movable mold.

The molten resin injected into the cavity in the injection molding machine can be cooled and solidified in the cavity, and the cooled injection product can be taken out of the mold by an operator or a robot after the movable mold is separated from the fixed mold.

However, since the mold is provided with a gate into which the molten resin is injected into the cavity, the injection-completed injection product may have a protrusion formed at a portion corresponding to the gate. After the injection process is completed, a separate process is in progress to remove the protrusion of the injection product.

Korean Patent No. 11183171 (applied on 2010.110.18) discloses an automatic gate cutting device for an injection mold that automatically cuts and removes the gate after the injection molding is completed and before the product is taken out of the mold.

The automatic gate cutting device of the conventional injection mold is provided on one side of the first and second molds, and the first and second molds, which are molded together to form a cavity for molding the injection product, and a sprue for injecting the molten resin. It is installed on an injection mold provided with a bush, a runner formed to move the molten resin from the sprue bush toward the cavity, and a gate for connecting the runner and the cavity to improve the flow of the molten resin. After being filled and cured, a cutting unit installed in the first mold to be lowered toward the second mold so as to cut the boundary between the gate attached to the injection product and the injection product, and a lowering to drive the cutting unit downward. A driving means and a support unit installed in the second mold, supporting a lower portion of the gate to be cut when the gate is cut by the cutting unit, and installed in the second mold so as to be elevating in the vertical direction. Equipped.

1 is a schematic configuration diagram showing a process of forming a protrusion of an injection product by a conventional injection mold apparatus, FIG. 2 is a perspective view showing an injection product manufactured by a conventional injection mold apparatus, and FIG. 3 is a prior art Is a diagram illustrating a state in which the protrusion of the injection product is removed through a processing process.

In the conventional injection mold apparatus, as shown in FIG. 1, a gate G may be positioned in a direction in which the movable mold 2 is separated from the fixed mold 1, and the molten resin is molded through the gate G. It may be injected into the cavity (C) formed between the fields (1, 2).

Of course, the injection-completed injection product A may have a protrusion a formed in the direction in which the movable mold 2 in which the cavity C is located is separated, as shown in FIG. 2.

According to the prior art, it is possible to cut only the protrusions located on the side of the mold among the injection products due to the structure of the mold and the cutting unit, but the protrusions located in the direction in which the mold is separated among the injection products cannot be arranged.

Therefore, after taking the injection product out of the mold, it is necessary to additionally proceed with a processing process of removing the protrusion of the injection product by using an end mill type tool separately, and even if the protrusion of the injection product is removed through the processing process. As shown in Fig. 3, there is a problem in that the intaglio (c) shape of the machining tool shape remains.

In addition, after the molten resin is sufficiently cured, there is a problem that the process time is lengthened because the protrusion of the injection product must be cut.

In addition, if the protrusion in a soft state that is not sufficiently cured is cut, it is difficult to obtain a uniform cut surface on the surface of the injection product, and there is a problem that the injection product is deformed.

In addition, even if the sufficiently hardened protrusion is cut, burrs generated during cutting remain in the mold, and there is a problem that affects the injection product manufactured by the following injection process.

The present invention has been conceived to solve the problems of the prior art, and an object of the present invention is to provide an injection mold apparatus capable of removing a protrusion of an injection product immediately before taking the injection product out of a mold.

The injection mold apparatus according to the present embodiment includes: a fixed core having an injection groove corresponding to a shape of one side of the injection product; A moving core provided to be movable so as to engage with the fixed core and provided with an injection groove corresponding to the shape of the other side of the injection product; A robot arm installed to be able to enter the space between the fixed core and the moving core; And a thermal jig provided on the robot arm and configured to pressurize a protrusion formed on an injection product seated on one of the fixed core and the moving core at a high temperature.

The present embodiment may further include an adsorption jig provided on the robot arm and adsorbing an injection product seated on one of the fixed core and the moving core.

The thermal jig may be continuously provided on one side of the adsorption jig.

The thermal jig includes a bracket mounted on the robot arm, a heating plate mounted on the bracket, a plurality of heating pins in contact with the heating plate, and a plurality of holes mounted on the heating plate and into which the heating pins are inserted. It may include a base plate provided.

The thermal jig may further include a heat insulating portion provided between the bracket and the heating plate.

The bracket, the heat insulating part, the heating plate, the base plate, and the heating pin may be assembled in a stacked structure.

One of the fixed core or the moving core may include a plurality of gates for supplying an injection melt to the injection groove, and the heating pins may be disposed at positions corresponding to positions of the gates.

The heating fin may have a groove having a diameter corresponding to the diameter of the gate.

The heating fin may have a groove having a depth smaller than the diameter of the gate.

The thermal jig further includes a plurality of location guide pins provided on the bracket and positioned to protrude more than the heating pins, and one of the fixed core or the movable core may have grooves corresponding to the location guide pins. I can.

The thermal jig may further include a heat insulating portion provided between the heating plate and the location guide pins.

The injection mold apparatus according to the present invention is provided with a thermal jig on the robot arm, so that the thermal jig presses the protrusions of the injection at high temperature just before the injection-completed injection is taken out from the mold, so that it can be quickly and neatly arranged.

Since the protrusions of the injection can be removed before the injection is completely cooled, and a separate post-process for cutting the protrusions of the injection can be omitted, the production time can be shortened and the production cost can be reduced. Even if the continuous injection process is performed, the quality of the injection product can be improved.

1 is a schematic diagram illustrating a process of forming a protrusion of an injection product by a conventional injection mold apparatus.
2 is a perspective view showing an injection product manufactured by a conventional injection mold apparatus.
3 is a view showing a state in which a protrusion of an injection product is removed through a processing process according to the prior art.
4 is a view showing an injection mold apparatus of this embodiment.
5 to 7 are a perspective view, a front view, and a side view showing a thermal jig applied to the present embodiment.
8 is a view showing an operating state of the injection mold apparatus of this embodiment.
9 is a view showing an operating state of the thermal jig in this embodiment.

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

Figure 4 is a view showing the injection mold device of this embodiment, Figures 5 to 7 are a perspective view, a front view, and a side view showing a heat jig applied to the embodiment, Figure 8 is an operating state of the injection mold device of this embodiment Is a view, and Figure 9 is a view showing an operating state of the thermal jig of the present embodiment.

The injection mold apparatus of this embodiment is described only for molds that mesh with each other in both directions, but can be applied to both molds that mesh with each other in the vertical direction.

As shown in FIG. 4, a base template 110, a cover template 120, a robot arm 130, an adsorption jig 140, and a thermal jig 150 may be included.

The base template 110 is a part for fixing the fixed core 111, and the fixed core 111 may have a groove corresponding to a shape of one side of the injection product.

The cover template 120 is a part for fixing the moving core 121, and the moving core 121 may be provided with a groove corresponding to the shape of the other side of the injection product.

The base template 110 and the cover template 120 are positioned to face each other, the fixed core 111 and the moving core 121 are also positioned to face each other, and the cover template 120 is moved with respect to the base template 110 It can be installed where possible.

The cover template 120 may be mold-opened or mold-closed on the base template 110, and when the base template 110 and the cover template 120 are mold-closed, the fixed core 111 and the moving core 121 are engaged with each other, A cavity C into which a molten resin can be injected may be formed by the groove of the fixed core 111 and the groove of the moving core 121.

The base template 110 and the cover template 120 may be provided with an injection machine (not shown) capable of supplying the molten resin, and the injection machine has a hopper for supplying the raw material of the molten resin, and a space in which the raw material is changed into molten resin. It may include, but is not limited to, a body providing a body, a heater for heating raw materials inside the body with molten resin, and a plurality of gates connected to the body to supply the molten resin into the cavity. Of course, the gates G on the injection machine side may extend to the groove of the fixed core 111 or the groove of the moving core 121.

The base template 110 may include a separating member 112 for dropping the injection product from the fixed core 111 to be movable, and may include a cooling unit (not shown) for cooling the fixed core 111. Can be, but is not limited.

Likewise, the cover template 120 may include a cooling unit for cooling the moving core 121, but is not limited thereto.

The robot arm 130 is installed to be movable between the base template 110 and the cover template 120, and may be installed to be able to enter the space between the fixed core 111 and the movable core 121. At the end of the robot arm 130, the suction jig 140 and the thermal jig 150 may be mounted side by side.

Of course, the robot arm 130 may be installed to be movable by a separate driving unit 131, but a driving motor may be provided for each joint of the robot arm 130, but is not limited thereto.

The adsorption jig 140 is a form capable of adsorbing an injection object, may be provided on the end effector of the robot arm 130, and may be moved according to the movement of the end effector of the robot arm 130.

The adsorption jig 140 may include a takeout plate 141 and a plurality of adsorption units 142 provided on the takeout plate 141, but is not limited thereto. Since the configuration of the adsorption jig 140 is a known matter, a detailed description will be omitted.

The thermal jig 150 is a type that can pressurize a protrusion formed on an injection product at a high temperature, and may be provided at the end of the robot arm in parallel with the suction jig, and may be provided on the same plane as the suction jig.

The thermal jig 150 includes a bracket 151, heat insulation parts 152a and 152b, a heating plate 153, a base plate 154, and a heating pin as shown in FIGS. 5 to 7 and 9 It may include 155 and location guide pins 156a to 156d.

The bracket 151 is a part that connects the suction jig and other components of the thermal jig to the robot arm, and may be mounted on the end effector of the robot arm 130, and may be variously configured to include a type of frame or plate. I can.

The take-out plate 141 may be connected to one side of the bracket 151, that is, an extended side of the bracket 151.

The heat insulating portions 152a and 152b, the heating plate 153, and the base plate 154 may be sequentially stacked on one surface of the bracket 151, and may be coupled to each other by bolts or the like.

The heat insulation parts 152a and 152b block the heat of the heating plate 153 from being transferred to the bracket 151 and the robot arm 130, and may be mounted between the bracket 151 and the heating plate 153, It is possible to prevent the bracket 151 and the heating plate 153 from directly contacting.

The heat insulating portions 152a and 152b may be made of a material having a low heat transfer rate, and may be configured in various ways, such as a plate shape or a bar shape. Of course, in order to reduce the weight load moved by the robot arm 130, it is preferable that the heat insulating portions 152a and 152b have a size smaller than that of the bracket 151 or the heating plate 153.

The heating plate 153 is a kind of electric heater that can be controlled in temperature, and may be mounted on the bracket 151 with the heat insulation portions 152a and 152b interposed therebetween, and the heating pins 155 may be heated to a high temperature.

The heating plate 153 may be configured in a form in which a heater and a temperature sensor are assembled on a plate made of a metal or non-metal material, but is not limited thereto.

The base plate 154 is a plate made of a metal or non-metal material to which the heating pins 155 may be mounted, and may fix the heating pins 155 to the heating plate 153.

The base plate 154 may be provided with a plurality of holes 154h, and the heating pins 155 may be selectively mounted on some of the holes 154h.

Of course, the holes 154h of the base plate may be provided in various positions. The positions of the protrusions formed on the injection product may be changed by gates located differently for each mold, and the holes 154h of the base plate are It may be provided to correspond to the position of the protrusions.

The heating pins 155 are parts that can press the protrusions of the injection product, and may be configured in the form of a pin made of a metal material that can be heated to a high temperature. One end of the heating pins 155 may be mounted in a form pressed into the holes 154h of the base plate.

The other end of the heating pins 155, that is, at the end of the heating pins 155, may be provided with a groove portion 155h that contacts the protrusions of the injection product. The diameter of the groove portion 155h corresponds to the diameter of the gate, and the groove portion ( The depth of 155h) is preferably configured to be smaller than the diameter of the gate.

Although the protrusion of the injection may be formed by the gate of the mold, the groove 155h of the heating pin 155 presses the protrusion of the injection immediately before the injection is taken out, so that the protrusion of the injection can be neatly arranged.

The position guide pins 156a to 156d are mounted on the bracket 151 and may protrude further than the heating pins 155. At least two or more position guide pins 156a to 156d may be provided, and one may be provided at each corner of the bracket 151.

Before the heating pins 155 press the protrusions of the injection product, grooves (not shown) into which the position guide pins 156a to 156d can be easily inserted may be provided in the fixed core 111 or the moving core 121 . That is, when the position guide pins 156a to 156d are fitted into the grooves of the fixed core 111 or the moving core 121, the heating pins 155 may be accurately opposed to the protrusions of the injection product.

Meanwhile, in order to block heat from the heating plate 153 from being transferred to the position guide pins 156a to 156d, heat insulating portions 152a and 152b may be additionally provided. The position guide pins 156a to 156d may pass through the heat insulating parts 152a and 152b, and the heat insulating parts 152a and 152b may extend between the heating plate 153 and the position guide pins 156a to 156d. .

Looking at the operating state of the injection mold device configured as described above, as follows.

When the base template 110 and the cover template 120 are joined, the moving core 121 is engaged with the fixed core 111, and a molten resin is formed between the fixed core 111 and the moving core 121 through the gates. After filling the cavity, as the molten resin in the cavity is cooled, the injection product A may be injection-molded in the shape of the cavity. Of course, protrusions (a) may be formed on the surface of the injection product (A) at portions corresponding to the positions of the gates.

Next, when the base template 110 and the cover plate 120 are molded open, the moving core 121 is separated from the fixed core 111 as shown in FIG. 8A, and the robot arm 130 is opened with a jig 150 Can be moved adjacent to the injection product (A) seated on the fixed core (111).

Next, when the robot arm 130 moves the thermal jig 150 in the direction of the fixed core 111, the positioning guide pins 156a to 156d are fitted into the grooves of the fixed core 111 and heated to high temperature. It may be positioned to be exactly opposite to the protrusions (a) of the 155 and the injection product (A).

Next, when the robot arm 130 further moves the thermal jig 150 toward the fixed core 111, the high-temperature heating pins 155 are mounted on the fixed core 111 as shown in FIG. 8B ( The protrusions (a) of A) can be pressed, and the protrusions (a) of the injection product (A) can be arranged in the shape of a groove 155h provided at the end of the heating pins 155 as shown in FIG. 9. I can.

Next, when the robot arm 130 separates the thermal jig 150 from the injection product A, and then moves the take-out jig 140 in the direction of the fixed core 111, the adsorption parts 142 as shown in FIG. 8C. ) May adsorb one surface of the injection product A seated on the fixed core 111.

In addition, when the separating member 112 is operated on the side of the base template 110 and the separating member 112 separates the injection product A from the fixed core 111, the robot arm 130 is removed from the take-out jig 140 and Accordingly, the adsorbed injection product A can be completely moved to the outside of the mold.

As the take-out jig 140 and the heat jig 150 are provided side by side on the robot arm 130, the heat jig 150 is placed on the protrusions of the molded object (A) just before the take-out jig 140 takes out the molded product (A). (a) can be quickly cleaned up by hot pressing.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, 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 interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

110: base template 111: fixed core
112: separating member 120: cover template
121: moving core 130: robot arm
140: take-out jig 150: thermal jig
151: bracket 152a, 152b: insulation
153: heating plate 154: base plate
155: heating pin 156a~156b: position guide pin

Claims (11)

A fixed core provided with an injection groove corresponding to the shape of one side of the injection product;
A moving core provided to be movable so as to engage with the fixed core and provided with an injection groove corresponding to the shape of the other side of the injection product;
A robot arm installed to be able to enter the space between the fixed core and the moving core; And
An injection mold apparatus comprising: a thermal jig provided on the robot arm and for pressing a protrusion formed on an injection product seated on one of the fixed core and the moving core to a high temperature. The method of claim 1,
An injection mold apparatus further comprising a suction jig provided on the robot arm and adsorbing an injection product seated on one of the fixed core and the moving core. The method of claim 2,
The heat jig,
An injection mold apparatus continuously provided on one side of the adsorption jig. The method of claim 1,
The heat jig,
A bracket mounted on the robot arm,
A heating plate mounted on the bracket,
A plurality of heating pins in contact with the heating plate,
An injection mold apparatus comprising a base plate mounted on the heating plate and provided with a plurality of holes into which the heating pins are inserted. The method of claim 4,
The heat jig,
Injection mold apparatus further comprising a heat insulating portion provided between the bracket and the heating plate. The method of claim 5,
The bracket, the heat insulating part, the heating plate, the base plate, and the heating pin are assembled in a laminated structure. The method of claim 4,
One of the fixed core or the moving core,
Including a plurality of gates for supplying the injection melt to the injection groove,
The heating pins,
An injection mold apparatus disposed at a position corresponding to the position of the gates. The method of claim 7,
The heating pin,
Injection mold apparatus having a groove having a diameter corresponding to the diameter of the gate. The method of claim 8,
The heating pin,
Injection mold apparatus having a groove having a depth smaller than the diameter of the gate. The method of claim 4,
The heat jig,
Further comprising a plurality of position guide pins provided on the bracket and positioned to protrude more than the heating pins,
One of the fixed core or the moving core,
An injection mold apparatus having grooves corresponding to the position guide pins. The method of claim 10,
The heat jig,
Injection mold apparatus further comprising a heat insulating portion provided between the heating plate and the position guide pins.

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