KR100663269B1 - A upper metallic mold for molding of a molding goods with undercut - Google Patents

Abstract

The present invention is to provide an undercut molding apparatus of an upper mold for improving productivity and obtaining a high-quality injection molding by imparting durability and stability of a deformation mill pin for molding an injection molded article having an undercut. An undercut molding apparatus having a deformation mill pin configured to be formed in an upper mold and lifting in a diagonal direction so that an injection-molded product having an undercut is molded and discharged between a lower mold plate and a corresponding upper mold plate, wherein the upper mold die corresponds to an upper side of the upper mold plate. Holder installation holes 310 formed at left and right sides of the central axis of the holder; A holder 320 installed on each holder installation hole and having an operating piece moving hole inclined toward a central axis therein; An operating piece 330 inserted and installed on the inner working piece moving hole of the holder and being elevated, and having a connection groove to which the deformation mill pin is connected to an inner side of the holder; An elastic member 360 inserted and installed in an insertion groove of the working piece to apply downward pressing force to the working piece; A holder cover member 370 which is fastened to seal the operating piece moving hole at an upper side of the holder and has a groove portion into which an upper portion of the elastic member is inserted on an inner surface corresponding to the insertion groove of the operating piece; When the upper end is connected to the bottom of the working piece and is elevated and the upper and lower molds are in close contact, the lower end is in contact with the upper surface of the lower plate while raising the working piece and retracting the deformation mill pin 340 to place the undercut molded part in the correct position. Milpin adjusting pin 350 to be configured.

Description

Undercut molding apparatus of upper mold {A UPPER METALLIC MOLD FOR MOLDING OF A MOLDING GOODS WITH UNDERCUT}

1 is a schematic cross-sectional view showing a main part of an undercut molding apparatus of a conventional upper mold;

Figure 2 is a schematic cross-sectional view showing the main part of the mold undercut molding apparatus according to a preferred embodiment of the present invention,

3 is an enlarged exploded perspective view of portion A of FIG.

4 is a view for explaining the action of the undercut molding apparatus of the upper mold according to a preferred embodiment of the present invention.

* Explanation of symbols for main parts of drawings *

100: mold, 110: fixing plate,

120: Auxiliary fixing plate, 130: Senate plate,

140: upper mold plate, 200: lower mold,

230: lower plate, 240: lower plate,

300: undercut molding apparatus, 310: holder mounting hole,

320: holder, 330: operation piece,

340: deformation pin, 350: pin adjustment pin,

360: elastic member, 370: holder cover member.

The present invention relates to an undercut molding apparatus of an upper mold, and more particularly, to an undercut molding apparatus of an upper mold, which can be easily discharged by molding an injection molded article having an undercut.

In general, an injection molding having an undercut formed downward in a bent end may be impossible to separate a molded injection due to interference of the undercut portion when the upper and lower molds are opened in a state where molding is completed, as shown in FIG. 1. Likewise, the undercut molding apparatus is configured on the upper mold to enable the ejection of the injection molding.

Such an undercut molding apparatus 20, as shown in the accompanying drawings, as shown in Fig. 1, the injection molded product 10 having the undercut 14 protruded downward on the inner surface in contact with the upper bent end 12 to form the undercut 14 And a deformable mill pin 22 having an undercut molded part having a protruding portion, and an elastic member 24 for applying a pressing force at an upper end of the deformable mill pin so as to move in a diagonal direction when the deformable mill pin 22 is elevated. The installation hole 26 etc. which the member 24 is accommodated are comprised.

Meanwhile, the upper mold 100 having the undercut molding apparatus 20 as described above is coupled to one side of the injection machine (not shown) as shown in FIG. 1 and the raw material injection unit (not shown) is coupled to the central portion. The upper fixing plate 110 to be, the auxiliary fixing plate 120 coupled to the lower portion of the upper fixing plate 110, and the upper plate to be coupled to the lower portion of the auxiliary fixing plate 120 and to form the upper surface of the injection molding in the center thereof ( 140 is composed of the upper plate 130 is coupled, the upper plate 130 and the upper plate (140) to move the deformation pins 22 to move the movable holes 132, 142 are formed in a diagonal direction; An elastic member 24 for applying a pressing force to the deformation mill pin 22 and an installation hole 26 in which the elastic member 24 is received are formed on the auxiliary fixing plate 120.

And the undercut molding apparatus 20 configured as described above, as shown in Figure 1, the upper and lower molds 100, 200 are in close contact with each other after the injection molding the upper mold 100 from the lower mold 200 When spaced apart by the elastic force of the elastic member 24, the lower end portions of both the deformation pins 22 are moved downward in the form of gathering with each other toward the central axis, so that they are separated from the undercut 14 portion of the injection molding 10, and thus the injection molding has a restraining force It is released and can be released.

However, the conventional undercut molding apparatus 20 as described above, since the external force applied from the elastic member 24 and the lower die plate 240 is directly transmitted to the deformation mill pin 22, the deformation mill pin is easily broken during the operation. In addition, if the deformation mill pin 22 is not accurately processed or a work error occurs, it is easily broken in the process of moving through the moving holes 132 and 142, so that frequent replacement and repair are required, thereby reducing productivity, and the relative length is reduced. Since the long deformation strain pin must be processed accurately, there was a problem that its maintenance time and cost is greatly increased.

And the lower end of the deformation mill pin 22 is in direct contact with the lower mold plate 240 of the lower mold 22, the bar is placed in a predetermined molding portion, the mechanical load is generated at the lower end of the deformation mill pin 22 and the undercut 14 There was a problem that the quality of the injection molding is lowered because the molding position is not maintained accurately.

The present invention is to solve the above problems, the object is to give the durability and stability of the operation of the deformation mill pin for molding the injection molding formed undercut (Undercut) to improve the productivity and to obtain a high-quality injection molding It is to provide an undercut molding apparatus.

In order to achieve the above object, the present invention is an undercut molding provided with a deformation mill pin which is configured on an upper mold and is elevated in a diagonal direction so that an injection molded product having an undercut is molded and discharged between the lower mold of the lower mold and the corresponding upper plate. An apparatus comprising: holder installation holes formed on left and right sides of a central axis of an upper mold corresponding to an upper side of the upper mold plate; A holder installed on each holder installation hole and having a perforated working piece moving hole inclined toward a central axis therein; An operating piece which is inserted into the inner working piece moving hole of the holder and is lifted up and formed with a connection groove to which the deformation mill pin is connected at the lower end thereof, and an insertion groove being inclined to a predetermined depth at an upper side thereof; An elastic member inserted into and installed in the insertion groove of the working piece to apply downward pressing force to the working piece; A holder cover member which is fastened to seal the operating piece moving hole on the upper side of the holder and has a groove portion into which an upper portion of the elastic member is inserted on an inner surface corresponding to the insertion groove of the operating piece; It is formed in the shape of a round bar, and the upper end is connected to the lower surface of the operation piece, and the upper and lower molds are in close contact with the lower end of the lower plate. It is characterized in that it consists of a mill pin adjusting pin for positioning.

Preferably, the holder cover member is a perforated hole through the groove portion so that the air flows during operation of the elastic member in a state coupled to the holder.

Then, a locking groove is formed on the upper surface of the upper plate to correspond to the insertion of the head in the state in which the pin adjustment pin is lowered.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 is a schematic cross-sectional view illustrating an undercut molding apparatus of an upper mold according to a preferred embodiment of the present invention, FIG. 3 is an enlarged exploded perspective view of the portion A of FIG. 2, and FIG. 4 is a view of the preferred embodiment of the present invention. As a figure for explaining the action of the undercut molding apparatus of the upper mold, some components are omitted or briefly illustrated to help understand the general parts of the mold apparatus and the description of the present invention.

The undercut molding apparatus of the upper mold according to the preferred embodiment of the present invention is configured on the upper mold so that the injection molding having the undercut is molded and discharged between the lower mold of the lower mold and the corresponding upper plate as shown in FIG. 2. do.

And the upper mold 100 is coupled to one side of the injection molding machine (not shown) and the top fixing plate 110 is coupled to the raw material injection unit (not shown) in the center, and the auxiliary fixing plate coupled to the bottom of the top fixing plate 110 120 and the upper plate 130 to which the upper plate 140 is coupled to the lower portion of the auxiliary fixing plate 120, the undercut forming apparatus 300 is an image corresponding to the upper side of the upper plate 140 Holder 320 which is installed on the holder mounting hole 310 formed on the left and right sides with respect to the center plate on the fixed plate 110, the auxiliary fixing plate 120 and the upper plate 130, and is installed on the holder 320 It consists of a working piece 330, the deformation mill pin 340, the mill pin adjustment pin 350, the elastic member 360 and the holder cover member 370 is installed on the working piece 330.

The holder 320 is installed on each holder installation hole 310 and has a substantially rectangular pillar shape in which the operating piece moving hole 322 is inclined toward the central axis therein.

The operation piece 330 is inserted into the inner operation piece moving hole 322 of the holder 320 and is elevated, and the connection groove 332 to which the deformation mill pin 340 is connected is formed at the lower end and is inserted into the upper side. The groove 334 is recessed to be inclined to a constant depth.

The elastic member 360 is inserted and installed in the insertion groove 334 of the operating piece 330 to apply a downward pressure to the operating piece 330 and the installation angle is the same as the installation angle of the deformation mill pin 340. Is installed.

The holder cover member 370 is fastened by a fastening bolt to seal the operating piece moving hole 322 on the upper side of the holder 320 and an elastic member on an inner surface corresponding to the insertion groove 334 of the operating piece 330. The groove 372 into which the upper portion of 360 is inserted is formed.

In addition, the holder cover member 370 is perforated to form a hole 374 through the groove 372 so that air flows during the operation of the elastic member 360 in a state coupled to the holder 320.

The push pin adjustment pin 350 is formed in a round bar shape, the upper end is connected to the bottom surface of the operation piece 330 is raised and lowered, the upper and lower mold upper and lower die plates (140,240) in close contact with the lower die plate While contacting the upper surface of the 240 to raise the operating piece 330 and at the same time to retract the deformation mill pin 340 to place the undercut molded part 342 in place.

In addition, the locking groove 142 is formed on the upper surface of the upper plate 140 to correspond to the insertion of the head in the state in which the pin adjustment pin 340 is lowered.

On the other hand, the deformation mill pin 340 connected to the operation piece 330 is processed and connected to have a certain assembly tolerance with the connection groove 332, as shown in the enlarged portion B of Figure 2 enables smooth operation even if there is a work error. The tolerance interval is preferably about 0.2 ~ 0.5mm.

The lower mold 200 configured to correspond to the upper mold 100 has a lower mold 240 corresponding to the upper mold 140 and a lower plate 230 to which the lower mold is coupled. It comprises a ejection device including a fixed plate, a top, and a bottom plate, including, but the general description in the mold apparatus, and its detailed description and illustration are omitted.

On the other hand, the configuration of the present invention is not limited to the above-described configuration can be applied to various modifications within the technical scope of the present invention.

The operation of the present invention as described above is as follows.

2 shows the upper mold 100 and the lower mold 200 installed on one side and the other side of the injection molding machine in close contact with each other by the operation of the injection molding machine. In this state, when the raw material is pressed into the raw material injection part, the gate connected thereto is connected. The raw material is supplied and the molding of the injection molding 10 is completed, that is, the body part of the injection molding 10 is formed between the upper and lower die plates 140 and 240, and the undercut molding part 342 of the deformation mill pin 340 is formed. The undercut portion of the injection molding is completed between the lower mold plates 240.

In this state, as shown in FIG. 4, when the upper mold 100 including the upper mold plate 140 is spaced apart from the lower mold 200 by the operation of the injection machine, the elastic force of the elastic member 360 is the working piece 330. While acting on the working piece moving hole 322 to move the working piece is inclined downward. At the same time, the deformation mill pin 340 is moved in a diagonal direction toward the central axis while the undercut molding portion 342 of the deformation mill pin 340 is completely removed from the undercut portion of the injection molding, so that the restraining force is released, the injection molding is removed.

Meanwhile, when the ejection of the injection molding is completed as described above and the injection molding machine is operated to mold another injection molding, the upper and lower mold plates 140 and 240 of the upper and lower molds 100 and 200 are operated to be in close contact with each other. At this time, the lower end of the mill pin adjustment pin 350, which protrudes downward by the elastic force of the elastic member 360, is first gradually raised while contacting the lower plate 240, and at the same time, the deformation mill pin 340 is also raised. The return operation is performed until the upper and lower mold plates 140 and 240 are in close contact with each other.

When the upper and lower mold plates 140 and 240 are in close contact with each other, the upward movement of the mill pin adjustment pin 350 is also stopped while the undercut part 342 of the deformation mill pin 340 is positioned and the undercut portion 14 of the injection molding 10 is positioned. This is molded accurately.

On the other hand, even if a working error occurs during the lifting operation of the deformation mill pin 340 as described above, the deformation mill pin 340 is separately coupled to the working piece 330 and has a small tolerance so that the deformation mill pin is not damaged and is smooth. The operation is performed.

In addition, since the deformation force pin 340 is directly transferred to the operating piece 330 having a large rigidity, the deformation mill pin 340 is not easily broken.

According to the undercut molding apparatus of the upper mold according to the present invention as described above, since the operating force is not directly transmitted to the deformation mill pin, smooth operation is performed even if a working error occurs without being easily damaged, thereby improving productivity according to the improvement of durability. And it can reduce the maintenance cost.

And since the height of the strain mill pin is precisely adjusted by a separate mill pin adjusting pin, it is possible to prevent the mechanical load acting on the bottom of the strain mill pin and to maintain the molding position of the undercut accurately, thereby improving the quality of the injection molding. It is a very useful invention.

Claims (3)

In the undercut molding apparatus provided with a deformation mill pin which is formed on the upper mold and lifts in a diagonal direction so that an injection-molded product having an undercut is molded and discharged between the lower mold plate of the lower mold and the corresponding upper plate. Holder installation holes formed on left and right sides of a central axis of the upper mold corresponding to the upper side of the upper mold plate; A holder installed on each holder installation hole and having a perforated working piece moving hole inclined toward a central axis therein; An operating piece which is inserted into the inner working piece moving hole of the holder and is lifted up and formed with a connection groove to which the deformation mill pin is connected at the lower end thereof, and an insertion groove being inclined to a predetermined depth at an upper side thereof; An elastic member inserted into and installed in the insertion groove of the working piece to apply downward pressing force to the working piece; A holder cover member which is fastened to seal the operating piece moving hole on the upper side of the holder and has a groove portion into which an upper portion of the elastic member is inserted on an inner surface corresponding to the insertion groove of the operating piece; It is formed in the shape of a round bar, and the upper end is connected to the lower surface of the operation piece, and the upper and lower molds are in close contact with the lower end of the lower plate. Undercut molding apparatus of the upper mold, characterized in that it comprises a pin pin adjustment pin for positioning. The method of claim 1, The holder cover member is an undercut molding apparatus of the upper mold, characterized in that the through hole through the groove portion is perforated so that the air flows during operation of the elastic member in the state coupled to the holder. The method of claim 1, Undercut molding apparatus of the upper mold, characterized in that the locking groove is formed on the upper surface of the upper plate to correspond to the insertion of the head in the state in which the pin adjustment pin is lowered.

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