KR200417872Y1 - Injection Molding Machine - Google Patents

Abstract

The present invention relates to an injection mold in which the lifting structure of the mill pin is improved, and more specifically, the lifting structure of the mill pin so that the mill pin installed to take out the injection molded product formed as a result of the injection molding can be quickly returned after the product is taken out. Relates to an improved injection mold.

The injection mold of the present invention is a housing having upper and lower molds, which are molded to form a predetermined cavity, and a hollow part which is installed in a mill pin and a lower mold for taking out a product, and has a hollow part formed with a seating jaw, a mill pin guide part, and a collet guide part. And, while having an accommodating groove in which the mil pin can be retracted, the inner diameter of the accommodating groove is elastically shrunk when it rises along the collet guide part, and is formed to have a plurality of divided pieces divided to hold the body of the mil pin, and along the collet guide part. The collet member and the collet member are installed to raise and lower the mil pin when the lift, the descending is provided with a mill plate for raising and lowering the collet member.

The injection mold according to the present invention uses the housing and the simple collet member to adjust the rising and falling speed of the mill pin to take out the mill pin to take out the finished product, and then the mill pin is quickly returned to produce the next product. The preparation time of the mold is shortened and the device for taking out the product is simplified, thereby reducing the risk of failure or breakage.

Description

Injection mold with improved lifting structure of Milpin {Injection Molding Machine}

1 is a cross-sectional view of an injection mold according to the present invention

Figure 2 is an enlarged cross-sectional view of the extraction unit of the injection mold of Figure 1

Figure 3 is a partially cutaway perspective view of the ejection unit of the injection mold of Figure 1

<Explanation of symbols for the main parts of the drawings>

10; Injection mold 11; First upper fixation plate 12; Second Approved Edition

13; Upper mold 14; Bottom mold 15; Space block

16; Fixation plate 17; Milpin support plate 18; Milpin Moving Plate

21; Inlet 22; Soup

23; Runner 24; Gate 25; Cavity

30; Take-out unit 31; housing

32; Milpin guide portion 33; Collet guide part

34; Milphin 34a; Head 34b; Torso

35; Collet member 35a; Receiving groove 35b; Division

36; Seating part

The present invention relates to an injection mold in which the lifting structure of the mill pin is improved, and more particularly, an ejection unit configured to quickly return a mill pin installed to take out an injection molded product formed as a result of the injection molding. It relates to an injection mold provided.

In general, injection molding is performed through a series of processes in which a molten resin is filled in a cavity corresponding to a product formed by a combination of upper and lower molds, solidified and taken out.

Referring to the operation of the conventional injection mold as follows.

Filling the molten resin into the cavity formed through the molding of the upper and lower molds, and when the filled molten resin is solidified and the molding of the product is completed, the safety pin and the mold pin of the injection mold separate the upper mold and the lower mold, and the ejection rod pushes the plate. Serve At this time, the core installed to form the undercut portion is pushed out by the slide pin, and the mill pin pushes the product upwards. At this time, the spring inserted into the safety pin is compressed due to the rise of the mill plate.

When the ejection rod of the injection mold is retracted after the ejection of the product is finished, the mill plate is retracted by a restoring force of the spring inserted into the compressed safety pin, and then the bottom of the mill pin is a mill pin retracting device installed on one side of the injection mold. Pushing the upper end of the plate causes the mill to retract to its original position.

In the related art, as described above, a spring is installed on the upper side of the mill plate to retreat the mill plate to its original position, and a mill pin and a mill pin bush are additionally installed as a mill plate retractor for assisting the spring. However, when using such a method, the number of parts for the retraction of the mill plate, such as the mill pin and the mill pin bush increases the risk of failure and breakage, and the structure of the injection mold is complicated to make the injection mold difficult. In addition, the conventional injection mold has to wait until the injection mold is separated when lifting the plate for the operation of the pin, and then lift the pin. After the extraction of the product is completed, it takes a long time for the return of the pin to produce the next product. The waiting time was long.

In consideration of such a problem, Korean Utility Model Publication No. 20-0172310 discloses an early mold retracting device for an injection mold.

The early mold retracting device of the injection mold is supported on the upper surface of the groove formed in the lower mold and the inner side of the lower mold and the lower end penetrates the upper surface of the mill and is fixed by bolts. It is configured by installing a gas spring on the mill plate is tabbed using a fixing bolt.

However, the injection mold of the prior art also has to provide a space for installing the gas spring separately in the injection mold, it takes a long time to set the mill pin to its original position after taking out the product.

In order to solve the above problems, the present invention has an object of providing an injection mold with improved lifting structure of the mil pin which is quickly returned to the mil pin for the next molding after taking out the finished product from the injection mold.

The injection mold with improved lifting structure of the milpin of the present invention for achieving the above object is the upper and lower molds are formed to form a predetermined cavity, and extends downward from the head and the head, but the outer diameter is smaller than the head Milpin having a body portion formed, and is provided in the lower mold has a hollow portion, the hollow portion is a seating jaw corresponding to the outer diameter of the head of the mill pin, and extends downward from the seating jaw and the body of the pin can rise and fall The collet guide has a housing having a mil pin guide portion having an inner diameter, extending downward from the mil pin guide portion, and a collet guide portion tapered so that the inner diameter thereof widens downward, and a receiving groove into which the body portion of the mil pin can be drawn. As the inner diameter of the accommodating groove is elastically contracted when raised along the portion, a plurality of partitions are formed to grip the body of the milpin. And it is formed to have a halpyeon and the collet member so as to elevating the milpin when W, fall along the guide collet, the collet member is provided that includes a milpan W, lowering the collet member.

Hereinafter, with reference to the drawings illustrating the configuration and operation of the injection mold according to the present invention through one embodiment of the present invention.

1 is a cross-sectional view of the injection mold according to the present invention, Figure 2, Figure 3 is a cross-sectional view and perspective view of the ejection unit of the injection mold according to the present invention.

The injection mold 10 according to the present invention has a sprue bush 22 at a lower side of the first upper fixing plate 11 having the injection hole 21 and the sprue bush 22 in which molten resin is injected as shown in the drawing. ) Is coupled to the second upper fixing plate 12, the runner 23 is installed in communication with. The upper mold 13 is coupled to the lower side of the second upper fixing plate 12. The upper mold 13 has a gate 24 communicating with the runner 23 and filling the cavity 25 with the molten resin. . Although not shown, the gate 24 may be provided with an interruption device for interrupting the injection of the molten resin, and a heater for preventing solidification of the molten resin may be installed.

The lower mold 14 is combined with the upper mold 13 to form a cavity 25 at the lower side of the upper mold 13. The lower mold 14 is also provided with a takeout unit 30 for taking out the product after the molding of the product is completed.

2 and 3 show the take-out unit 30 in more detail.

The milk pin 34 of the take-out unit 30 has a body portion whose upper surface extends downward from the head portion 34a and the head portion 34a in contact with the product when the product is taken out, and whose outer diameter is smaller than the head portion 34a ( 34b). The mil pin 34 is lowered when the molten resin is filled in the cavity 25 and the product is being molded, and the upper surface of the head 34a of the mil pin 34 forms part of the cavity 25.

The lower mold 14 is provided with a housing 31.

The housing 31 has a hollow portion, and the hollow portion is provided with a seating jaw 36 to which the head 34a of the mill pin 34 can be seated when the mill pin 34 descends. Extending downward, the milpin guide portion 32 and the collet guide portion 33 are formed in this order.

The milpin guide portion 32 has an inner diameter that can support the milpin 34 can be pulled out and withdrawn mil pin 34 is installed to enable the lifting, lowering. In addition, the collet guide portion 33 formed to extend from the mill pin guide portion 32 is tapered so that the inner diameter becomes wider as it proceeds downward.

The lower mold 14 has a space block 15 below, and a fixing plate 16 is coupled to the bottom surface of the space block 15 to support the injection mold 10.

A milpin movable plate 18 is installed between the top surface of the fixed plate 16 and both space blocks 15, and a milpin support plate 17 is coupled to the top surface of the milffin movable plate 18 to form a mill plate.

The Milpin movable plate 18 is configured to be lifted and lowered by a cylinder (not shown) as a lift drive source.

On the upper surface of the milpin support plate 17 is provided a collet member 35 configured to hold the mil pin 34 when the mil pin 34 is elevated.

The collet member 35 has an accommodating groove 35a through which the body portion 34b of the mill pin 34 can be retracted, but the inner diameter of the accommodating groove 35a is burnt when the collet guide portion 33 is raised along the collet guide portion 33. It is formed so as to have a plurality of divided pieces 35b which are sexually contracted to be divided so as to grip the trunk portion 34b of the mil pin 34.

As shown in FIG. 3, in the embodiment of the present invention, the fixing jaw 37 is formed at the lower side of the housing 31 to fix the housing 31 installed in the lower mold 14 to the lower mold, and the fixing jaw ( 37) but fastening with bolts by installing the fastening auxiliary member 38 below, the fastening method may be applied to a variety of methods other than those shown.

Hereinafter, the operation process through the drawings showing an embodiment of the injection mold 10 according to the present invention.

First, the upper mold 13 and the lower mold 14 are combined to form a cavity 25 corresponding to the shape of the product to make a space for filling the molten resin.

When the mold is made, the molten molten resin is injected into the injection mold 10 through the injection hole 21. The injected molten resin is filled into the cavity 25 through the sprue of the sprue bush 22, the runner 23, and the gate 24. When the cavity 25 is filled with molten resin, cooling is started to solidify the product.

After the molten resin is solidified and the molding of the product is finished, the molded product is taken out, and the upper mold 13 and the lower mold 14 are separated so that the molded product can be taken out. (34) Take out this product.

The operation process of the take-out unit 30 is as follows.

When the mold separation of the injection mold 10 is made, the milpin movable plate 18 installed on the top of the fixed plate 16 is lifted. As the milpin movable plate 18 moves up and down, the milfin support plate 17 and the collet member 35 installed thereon are also lifted together, and the collet member 35 moves up and down along the collet guide portion 33 of the housing 31.

At this time, since the initial inner diameter of the receiving groove 35a of the collet member 35 is larger than the outer diameter of the trunk portion 34b of the mill pin 34, the collet member 35 is raised and lowered in accordance with the lifting and lowering of the movable pin plate 18. Milpin 34 does not operate at the beginning of the elevation. However, since the collet guide portion 33 is tapered, the inner diameter of the receiving groove 35a of the collet member 35 is narrowed by the collet guide portion 33 as the push pin moving plate 18 is continuously elevated. At the mill pin 34 is gripped by the collet member 33. When the collet member 35 grasps the mill pin 34, the mill pin 34 also moves up and down along the elevation of the mill pin movable plate 18 to take out the molded product.

When the extraction of the product is completed, the milpin movable plate 18 is lowered again and the collet member 33 is also lowered together. At this time, the mill pin 34 is lowered together with the collet member 35, and the collet member 35 is wider than the outer diameter of the body portion 34b of the mill pin 34 at a predetermined height of the receiving groove (35a). When the coupling between the collet member 35 and the mil pin 34 is released, the mil pin 34 is lowered by its own weight, and the head 34a is seated on the seating jaw 36 formed on the housing 31, thereby mil pin 34. Return is made.

As described above, the injection mold according to the present invention prepares the molding of the next product by quickly retracting the mill pin after drawing the mill pin to take out the finished product by adjusting the rising and falling speed of the mill pin by using the housing and a simple collet member. The time is shortened.

In addition, because the device for taking out the product is simplified, the risk of failure or damage is reduced.

Claims (1)

Upper mold; A lower mold joined with the upper mold to form a predetermined cavity; A milpin having a head and a body portion extending downward from the head and having a smaller outer diameter than the head; It is installed in the lower mold and has a hollow portion, the hollow portion has a seating jaw corresponding to the outer diameter of the head of the milpin, and a milfin guide having an inner diameter that extends downward from the seating jaw, the body portion of the milpin can rise and fall A housing having a collet guide portion which extends downward from the mil-pin guide portion and which extends downward as the inner diameter thereof widens; The body of the milpin has a receiving groove which can be drawn in, but when it is raised along the collet guide portion, the inner diameter of the receiving groove is elastically contracted so as to have a plurality of divided pieces divided to hold the body of the milpin A collet member configured to raise and lower the mill pin when the collet guide unit is lifted and lowered; The collet member is installed is an injection mold with improved lifting structure of the mill pin, characterized in that it provided;

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