KR20180012719A - skin form mold - Google Patents

Abstract

The present invention relates to a skin foam mold. According to the present invention, the skin foam mold comprises: a fixed block which is spaced apart from a movable block by a guide rod; a fixed mold which is installed on the fixed block; a movable mold which is installed on the movable block; a rotating block which is rotatably installed between the fixed block and the movable block, is combined with the fixed mold to form a first molding member, and in which two rotating molds are formed, wherein the rotating molds are each installed in opposing positions from each other so as to form a surface processing film on the surface of the first molding member by being combined with the movable mold of the movable block, and are combined with the fixed mold and the movable mold; and a mixing head unit which is installed on the movable mold to inject a skin material for forming the surface processing film on the rotating mold combined with the movable mold. More specifically, the mixing head unit comprises: a mixing head main body which is formed to expose a mixing head on the front surface thereof; and a sliding plate which is joined to the mixing head main body, wherein the sliding plate is joined so as to be vertically slidable in a joined part of the movable mold.

Description

Skin form mold < RTI ID = 0.0 >

The present invention relates to a skin foam mold, and more particularly, to a skin foam mold capable of forming a surface treatment film with a skin material on the surface of a primary molded product.

Generally, plastics are used as core materials in most products leading domestic and overseas industries because they are low cost, easy to mass-produce, lightweight, and can realize various physical properties. Among them, the largest number of molded articles are produced by the injection molding method. Especially, in accordance with the trend of high-grade and multi-functionalization of plastic products, it is possible to design products with a high gloss and various colors ranging from automobiles, mobile phones, home appliances to vessels, , And coatings on plastic surfaces are becoming more important in order to realize various functions such as electromagnetic shielding, scratch resistance, chemical resistance and weather resistance.

However, in order to protect the surface of the injection-molded product and improve the appearance quality, gloss, scratch resistance, durability, weather resistance, etc., a separate process is required after the molding of the product as the base material is completed.

Surface treatment techniques such as plating, painting, deposition, printing, and the like are frequently influenced by the surface condition and the manufacturing environment of the injection substrate in the post-process which is commonly used, and also increase the production cost and lead time, Problems such as non-uniformity of coating thickness and the like are still present.

In order to reduce these problems for a relatively long time, in-mold decoration (IMD), in-mold decoration (IMD), in-mold labeling (In- Mold Labeling (IML), and Film Insert Molding (FIM) have been introduced to reduce process steps compared to post-processing. However, this also requires a separate skin material to be processed and the coating thickness can not be reduced.

As a prior art requiring preparation of a skin material as described above, Korean Patent Registration No. 10-0420631 discloses "a method for manufacturing a panel for inserting and molding a film, and a mold used for its manufacture ". The film is inserted into the fitting line formed by the upper mold fixed to the upper mold plate of the injection molding machine and the lower mold fixed to the lower mold plate so that the resin introduced through the nozzle of the injection molding machine and the sprue bushing is injected into the cavity space of the upper and lower core accommodated in the upper and lower plates, After the process, the panel is molded by taking it out. In this case, however, it is difficult to realize injection molding and surface coating at the same time.

In view of this point, Korean Patent Registration No. 10-1597791 discloses an in-mold coated mold for simultaneous injection molding and surface coating.

The posted mold includes a movable side mold having a movable core on which a substrate is molded and a curing-type coating material injection path, and a substrate cavity and a coating cavity on a surface facing the movable side mold, A sliding plate which is slid so as to be selectively formed, and a fixed side mold provided with a thermoplastic resin injection path.

In the mold thus constructed, the thermoplastic resin is injected into the substrate cavity and cooled. After the base material of the thermoplastic resin is solidified, the stationary-side mold is separated from the movable-side mold, the stationary-side mold is slid by using the sliding plate, After the mold and the coating cavity are opposed to each other and the movable mold with the substrate is closed, the coating material is injected into the space between the substrate surface and the coating cavity through the curing-type coating material injection path to cure the coating material in the mold, The structure of the mold is relatively complicated and the molding time is relatively long.

On the other hand, there is also a demand for a structure capable of easily discharging the initial discharge portion, which is deteriorated in homogeneity when the skin material is injected, to the outside.

Korean Patent Registration No. 10-1597791. Korean Patent Registration No. 10-1597791.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a skin foam mold capable of performing a surface treatment by injecting a skin material in a secondary molding space, It has its purpose.

It is still another object of the present invention to provide a skin foam mold that improves molding efficiency by blocking injection of a skin material in accordance with a time when the skin material is completely filled in the molding space.

According to an aspect of the present invention, there is provided a skin foam mold comprising: a movable block; A stationary mold installed in the stationary block; A movable mold installed in the movable block; A first mold member is formed to be rotatable between the fixed block and the movable block and is formed with the fixed mold so as to be cooperated with the movable mold of the movable block to form a surface treatment film on the surface of the first molded member A rotary block having two rotary molds, which are installed at opposite positions to each other and are formed in the stationary mold and the movable mold; And a mixing head unit installed in the movable mold and injecting a skin material for forming the surface treatment film into a rotary mold formed by the movable mold, wherein the mixing head unit comprises a mixing head body Wow; And a sliding plate formed on the front surface of the mixing head body so as to expose the mixing head to a size larger than the front surface of the mixing head and coupled to the mixing head body, The sliding plate is spaced apart from the movable mold so as to be slidable in a vertical direction so that the sliding plate is in a restrained state, 1 and second protruding portions and first and second restricting guide portions extending from the first protruding portion and the second protruding portion to a portion where the first protruding portion and the second protruding portion are closer to each other, And a restraining screw having a head portion having an outer diameter is formed on the outer side of the sliding plate Are respectively coupled to the coupling portion of the group is the movable mold so as to support the sliding plate.

An overflow line extending between the movable mold and the rotary mold and communicating with a secondary molding space corresponding to the surface treatment film forming space along an injection line through which the skin material injected from the mixing head unit is transferred, An auxiliary storage space formed to be deeper than the overflow line so as to receive the skin material flowing through the overflow line at the end of the overflow line is formed and the exhaust hole formed at the side of the auxiliary storage space is slid A slider for opening and closing the slider; A pressure sensor disposed on a branch line branched from the injection line to detect a pressure change due to injection of the skin material; The time counting is started when the pressure value detected from the pressure sensor reaches the set reference pressure, and the counted time is set at a filling reference time corresponding to a time when the skins are filled in the secondary molding space and proceed to the overflow line And stopping the injection of the skin material from the mixing head.

According to the skin foam mold of the present invention, since the primary injection molding for molding the first molded member and the molding of the surface treatment film for the surface treatment of the first molded member are independently performed, continuous production is possible, It is not necessary to perform a separate surface treatment operation on the surface of the substrate, so that the productivity of the product can be improved. In addition, when the initial discharge portion of the surface treatment film-forming skin material is discharged to the outside, the discharge operation is easy, and the injection of the skin material is blocked in accordance with the time when the skin material is completely filled in the secondary molding space, .

1 is a plan view showing an example of a molded product to be molded,
Fig. 2 is a side view of the molded article of Fig. 1,
3 is a side view of a skin foam mold according to the present invention,
FIG. 4 is a partial exploded perspective view showing a state in which the mixing head unit of the skin foam mold according to the present invention is engaged with the movable mold,
FIG. 5 is a front view of the combined state of the mixing head unit of FIG. 4,
FIG. 6 is an exploded perspective view showing a state in which the mixing head unit of FIG. 4 is separated from the movable mold,
FIG. 7 is a partial cross-sectional view illustrating the skin re-injection path of the skin form mold of FIG. 3,
Fig. 8 is a drawing showing the slider entrance portion of Fig. 7,
9 is a view showing a state in which the slider of FIG. 7 is retracted.

Hereinafter, a skin form mold according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, a product molded by a skin foam mold according to the present invention is shown in FIGS. 1 and 2. FIG.

As shown in FIGS. 1 and 2, the skin foam mold according to the present invention has a structure in which a thermosetting resin, which is applied as a skin material to the surface of a first molded member 1, The surface treatment film 2 is produced by secondary liquid phase injection molding under pressure so that the finished molded product 3 can be produced.

3 is a side view of a skin foam mold according to the present invention.

Referring to FIG. 3, the skin foam mold 10 according to the present invention includes a fixing block 20, a movable block 50, and a rotating block 70.

The stationary block 20 is provided with a stationary mold 30.

The movable block 50 is provided so as to be spaced apart by the fixed block 20 and the guide rod 21 and is moved forward and backward along the guide rod 21 with respect to the movable block 50.

The movable block 50 is provided with a movable mold 60.

The rotary block 70 is rotatably installed between the stationary block 20 and the movable block 50.

The rotary block 70 is rotatably supported by the rotary table 80 and is rotated by a rotary drive unit 81 controlled by a control unit described later.

The rotation driving unit 81 may be a stepping motor. The rotation driving unit 81 is not limited to this, and may be a structure capable of rotating the rotation block 70. For example, the rotation driving unit 81 may be an actuator such as a hydraulic motor.

The rotary block 70 is formed with the stationary mold 30 to form the first molded member 1 and the movable block 50 is assembled with the movable mold 60 to form the surface of the first molded member 2 Two rotary molds 71 are provided at positions mutually opposed to each other to form the treatment film 3 and are formed in the stationary mold 30 and the movable mold 60, respectively.

In this structure, between the fixed block 20 and the stationary mold 30, or between the rotary table 80 and the rotary mold 71, a first (not shown) An actuator is installed.

The first actuator may be a hydraulic cylinder, but is not limited thereto.

A separate guide member may be provided for smooth engagement and disengagement between the stationary mold 30 and the rotary mold 71.

The movable mold 60 and the rotary mold 71 are not interposed between the movable block 50 and the movable mold 60 or between the rotary table 80 and the rotary mold 71, And a second actuator for moving the second actuator in a separate direction.

A separate guide member may be provided for smooth engagement and disconnection between the movable mold 60 and the rotary mold 71. [

The molding resin is supplied to the primary molding space (not shown) formed by the stationary mold 30 and the rotary mold 71 for molding the first molded member 1 on one side of the stationary mold 30 Spruce Bush and Runner are available.

A skin material is injected into the secondary molding space where the movable mold 60 and the rotary mold 71 are formed by mutual molding to form a coating film on the surface of the first molded member 1 formed in the stationary mold 30 Is provided in the movable mold (60).

The mixing head unit will be described with reference to Figs.

The mixing head unit 90 is provided in the movable mold 60 so that a skin material for forming the surface treatment film 3 can be injected into a rotary mold which is formed with the movable mold 60.

The mixing head unit 90 includes a mixing head body 91 formed in such a manner that the mixing head 93 is exposed on the front surface of the mixing head body 91, And a sliding plate 95 formed in a rectangular plate shape and coupled to the mixing head body 91.

On the right and left sides of the area of the sliding plate 95 deviating from the mixing head body 91, a long hole 96 is formed so as to extend vertically.

The injection hole 66 of the runner for aligning the mixing head 93 with the mixing head 93 is exposed in the engagement part 65 where the mixing head 93 of the movable mold 60 is engaged.

The engaging portion 65 is provided with first and second projecting portions 67a and 67b spaced apart from each other and projecting forward from the movable mold 60 so that the sliding plate 95 can slide in the vertical state in a restricting state, And a restricting guide portion 69 having first and second restricting guide portions 68a and 68b that are spaced apart from each other by a distance between the first and second protruding portions 67a and 67b, Respectively.

The restraining screw 98 has a head portion 98a having an outer diameter larger than that of the elongated hole 96 so that the engaging portion 65 of the movable mold 60 is inserted through the elongated hole 96 outside the sliding plate 95, Respectively, to support the sliding plate 95.

The sliding plate 95 is formed with left and right auxiliary holes 97 at a position spaced apart from the elongated hole 96 to enhance the supporting force.

The restraining screw 99 described above through the auxiliary hole 97 is engaged with the engaging portion 65 outside the sliding plate 95.

According to such a coupling structure, if it is difficult to provide a desired molding quality in the case of an initially transferred skin material, the sliding plate 95 is raised upward through the slot 96 to completely expose the mixing head 93 to the outside The initial skin material is discharged from the mixing hole 93 and the sliding plate 95 is moved downward so that the mixing head 93 is aligned with the injection hole 66.

Therefore, it is easy to externally discharge the unwanted skin material to the outside of the processing mold 60.

The mixing angle of the mixing head 93 of the mixing head body 91 with the injection hole 66 of the movable block 60 is preferably set to be inclined at about 3 degrees with respect to the movable block 60 Do.

On the other hand, a structure for blocking the discharge hole for guiding the discharge of gas or bubbles in accordance with the time when the skin material is completely filled in the secondary molding space, and for improving the molding efficiency by stopping the injection of the skin material will be described with reference to Figs. do.

First, a secondary molding space (corresponding to the surface treatment film forming space) is formed between the movable mold 60 and the rotary mold 71 along the injection line 66a of the runner to which the skin material injected from the mixing head unit 90 is fed 102 are formed.

Reference numeral 120 denotes a skin material supply unit which is controlled by the control unit 110 and supplies and blocks the skin material through the mixing head unit 90.

An overflow line 66b extending from the secondary molding space 102 and an overflow line 66b communicating with the secondary molding space 102 formed between the movable mold 60 and the rotary mold 71, An auxiliary accommodating space 66c is formed at the terminating end so as to be deeper than the overflow line 66b so as to accommodate the skin material flowing through the overflow line 66b.

Here, an exhaust hole 60b is formed in a side surface of the auxiliary receiver 60a forming the auxiliary receiving space 66c.

The slider 105 is capable of opening and closing the exhaust hole 60b of the auxiliary receiver 60a by sliding.

The slider 105 opens and closes the exhaust hole 60b while advancing and retracting by the cylinder 130 applied as the advancement and retraction driving portion.

The pressure sensor 114 is provided on the branch line 66d branched from the injection line 66a before the skin material reaches the secondary molding space 102 to detect the pressure change due to the injection of the skin material, And provides the pressure to the control unit 110.

The control unit 110 moves the slider 105 to the skin material supply unit 120 in a state in which the slider 105 opens the exhaust hole 60b, So that the skin material is injected through the mixing head unit 90.

In this process, when the pressure value detected from the pressure sensor 114 reaches the set reference pressure, the control unit 110 starts counting time, and the counted time is filled in the secondary molding space 102, The slider 105 controls the cylinder 130 so as to close the exhaust hole 60b and stops the injection of the skin material from the mixing head 93 when the filling reference time corresponding to the time of advancing to the mixing head 93 is reached, And controls the re-supply unit 120.

Here, the filling reference time may be a value obtained by preliminarily calculating the time at which the skin material overflows to the overflow line 66b after the skin material is completely filled in the secondary molding space 102.

The action of the skin foam mold 10 described above will be described below.

First, the first molding member 1 is injection-molded by molding the stationary mold 30 and the rotary mold 71 and injecting the first resin into the primary molding space formed by these. At the same time, the movable block 50 is transferred (transferred by a transfer unit installed in the injection machine), and the movable mold 60 and the rotary mold 71 provided on the rotary table 80 are mated together to form the first molded member 1 The surface treatment film 2 made of the skin material is formed on the surface of the first molded member 1 by injecting the skin material into the secondary molding space using the mixing head 93. [

The resin injection into the primary molding space formed by the stationary mold 30 and the rotary mold 71 is generally performed through a sprue bush and a runner formed in the mold.

First, the stationary mold 30 and the rotary mold 71 are used to separate the stationary mold 30 and the rotary mold 71 from the viewpoint of the product molding process. The first molded member 1 molded in this process is supported in the primary molding space of the rotating die 71.

Next, the rotary table 80 is rotated 180 degrees so that the rotary mold 71, in which the first molded member is molded, is opposed to the movable mold 60 so as to be mutually combined, and the other rotary mold 71 Can be associated with the stationary mold 30 so that they can cooperate with each other.

A gap is formed between the inner surface of the first molded member 1 and the inner surface of the movable mold 60 in a state in which the rotary mold 71 and the movable mold 60 on which the first molded member 1 is held are engaged.

In this state, a skin material is injected into the secondary molding space formed by the rotary mold 71 and the movable mold 60 by the mixing head 93 to form the surface treatment film 2 on the first molded member 1 do.

The movable block 50 is retracted and separated from the rotary mold 71. The movable mold 60 and the rotary mold 71 are separated from each other, And the rotation block 70 is rotated to repeat the above-described injection process.

As described above, since the skin foam mold 10 of the present invention can form the surface treatment film 2 using the skin material on the surface of the first molded member 1 to be primarily molded, It is possible to perform continuous molding and molding of various shapes of products, and it is possible to reduce the cycle time according to molding and to improve the productivity.

In addition, when the initial discharge portion of the surface treatment film-forming skin material is discharged to the outside, the discharge operation is easy, and the injection of the skin material is blocked in accordance with the time when the skin material is completely filled in the secondary molding space, .

10: Skin form mold 20: Fixed block
50: movable block 70: rotating block
90: Mixing head unit

Claims (2)

A fixed block installed to be separated by the movable block and the guide rod;
A stationary mold installed in the stationary block;
A movable mold installed in the movable block;
A first mold member is formed to be rotatable between the fixed block and the movable block and is formed with the fixed mold so as to be cooperated with the movable mold of the movable block to form a surface treatment film on the surface of the first molded member A rotary block having two rotary molds, which are installed at opposite positions to each other and are formed in the stationary mold and the movable mold;
And a mixing head unit installed in the movable mold and injecting a skin material for forming the surface treatment film into a rotary mold formed with the movable mold,
The mixing head unit
A mixing head body having a mixing head exposed on a front surface thereof;
And a sliding plate formed on the front surface of the mixing head body such that the mixing head is exposed to a size larger than the front surface of the mixing head and coupled to the mixing head body,
A slot extending in a vertical direction is formed in an area of the sliding plate which is deviated from the mixing head body,
The engaging portion of the movable mold to which the mixing head is engaged
First and second protruding portions spaced apart from each other and projecting forward from the movable mold so that the sliding plate can slide in a vertical state in a restrained state and portions protruding forward from the first and second protruding portions And a restricting guide portion having extended first and second restricting guide portions,
Wherein a restraining screw having a head portion having an outer diameter larger than the elongated hole is coupled to the engaging portion of the movable mold through the elongated hole from the outside of the sliding plate to support the sliding plate. The method according to claim 1,
An overflow line extending between the movable mold and the rotary mold and communicating with a secondary molding space corresponding to the surface treatment film forming space along an injection line through which the skin material injected from the mixing head unit is transferred, An auxiliary accommodating space formed deeply deeper than the overflow line so as to accommodate the skin material flowing through the overflow line at the end of the line,
A slider configured to open and close an exhaust hole formed in a side surface of the auxiliary accommodation space by sliding;
A pressure sensor disposed on a branch line branched from the injection line to detect a pressure change due to injection of the skin material;
The time counting is started when the pressure value detected from the pressure sensor reaches the set reference pressure, and the counted time is set at a filling reference time corresponding to a time when the skins are filled in the secondary molding space and proceed to the overflow line And a controller for controlling the slider to close the exhaust hole when it reaches the mixing head and stopping the injection of the skin material from the mixing head.

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