KR101112620B1 - seperable mold fin - Google Patents

Abstract

PURPOSE: A detachable molding pin is provided to enable convenient replacement of a molding pin because the thickness or diameter of the molding pin head is smaller than that of the molding pin body. CONSTITUTION: A detachable molding pin comprises a body and a head(521a). The body is inserted into the cavity of a molding device so that the outer circumference of the body corresponds to a through hole formed in a molding core forming the edge of the cavity. The head is extended from an end of the body and inserted in a receiving groove(531). The head has a stepped groove(521b) which is selectively restricted by a fixing element of a clamping unit of a molding pin clamping device. The thickness of the head is less than the thickness of the body so that the molding pin can be selectively separated toward the inside of the cavity through the through hole.

Description

[0001] The present invention relates to a separable mold fin,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold pin for detachable molding, and more particularly to a mold pin for detachable molding that provides an efficient maintenance and repair structure.

In general, a die casting or injection molding apparatus includes a core mold corresponding to a shape of a product to be molded by die casting or injection molding, and a plurality of peripheral devices including a mold pin inside the core mold for driving the core mold .

1 is a cross-sectional view showing a conventional mold apparatus.

As shown in FIG. 1, the mold apparatus 1 is provided with a molding portion core 5 on the inner side between the upper mold 3 and the lower mold 4, A cavity corresponding to the shape of the product to be molded by injection molding is formed. At this time, either one of the upper mold 3 and the lower mold 4 is provided as a movable mold, and when the movable mold is advanced and the mold is closed, the nozzle 7 and the sleeve are advanced and the molten high- Lt; / RTI >

At this time, when the shape of the hole or groove to be used as a fastener or the like is formed in the product, the molten material is injected at a high temperature while the molding metal pin 8 is inserted into the cavity. Holes or grooves corresponding to the shape of the molding die pin 8 can be formed in a product formed through die casting or injection molding, and the head portion provided at the lower end of the molding die pin 8 can be formed into a molded part core The lower side of the mold 5 and the frame of the mold apparatus by bolt fastening or the like.

On the other hand, since the molding metal fins 8 are exposed to a high temperature molten material which is melted and injected, fatigue is accumulated in the process of hardening the material, or breakage is frequently caused by the injection pressure in a high temperature environment. For example, in the case of aluminum die casting, it is exposed to a molten material at a high temperature of 600 ° C or higher.

However, in the conventional mold apparatus, in order to replace the broken molding die pin 8, the molding core and the peripheral mold parts constituting the mold apparatus must be disassembled one by one to release the bolts and the like, There was a time delay for the repair. In addition, there has been a problem that productivity and economical efficiency of the product deteriorate.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a mold pin for a detachable molding which provides an efficient maintenance and repair structure.

In order to solve the above-described problems, the present invention provides a molding die detachment mounting method comprising a mounting unit for performing a mounting operation in a receiving groove formed in a front end portion of the main body case, A mold for detachable molding to be attached to an apparatus, comprising: a body having an outer circumference corresponding to a through hole formed in a molding core forming an edge of the cavity, the insert being inserted and disposed inside a cavity of a mold apparatus; And a head portion extending from an end of the body and formed to be inserted into the receiving groove and having a stepped groove selectively constrained by a fixture of the attaching unit in accordance with a mounting operation of the forming die attaching device Wherein the thickness of the head portion is less than or equal to the thickness of the body so as to selectively separate the separate mold pin in the cavity inside the mold apparatus through the through hole in accordance with the mounting operation. .

Here, a cooling groove through which the cooling fluid flows may be formed inside the molding metal fin, and the cooling groove may be communicated with a flow path of the cooling fluid provided inside the molding metal pin separation type attachment device.

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The present invention provides the following effects through the above solution.

First, even when the detachable molding die pin is broken and replaced, the molding die is simply disassembled and replaced by a simple operation of the mounting unit without having to disassemble the molded core and the peripheral die parts. The time for maintenance is shortened, which can significantly improve the productivity and economy of the product.

Secondly, since the thickness and the diameter of the head of the separate mold pin are smaller than the thickness and the diameter of the body, the operator grips and removes the end of the replaceable mold releasing mold pin protruding inward from the mold apparatus .

Third, by providing a structure in which the separate-type molding die pin exposed to the molten material at high temperature is effectively cooled by the cooling fluid, the service life of the separate-type molding die pin can be remarkably increased.

1 is a sectional view showing a conventional mold apparatus;
2 is a cross-sectional view of a mold apparatus to which a mold releasing attachment apparatus for molding according to an embodiment of the present invention is applied.
3 is an external perspective view of a mold releasing device for forming pins according to an embodiment of the present invention;
4A and 4B are cross-sectional views of a mold releasing attachment device for molding according to an embodiment of the present invention.
5 is a cross-sectional view of a mold releasing attachment device for molding according to an embodiment of the present invention;
6 is a partial projected perspective view of a mold releasing attachment device for molding according to another embodiment of the present invention;

Hereinafter, a separate mold pin according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, descriptions of components similar or identical to those described in the background art will be omitted.

FIG. 2 is a cross-sectional view of a mold apparatus to which a mold releasing apparatus for molding according to an embodiment of the present invention is applied, and FIG. 3 is an external perspective view of a mold releasing apparatus for a mold according to an embodiment of the present invention.

As shown in FIGS. 2 and 3, the mold releasing attachment device 20 is fixed to the molding core 15 of the mold apparatus 10 through the peripheral frame by bolting or the like. Since the removable mold pin 521 is detachably attached to the mold pin detachment mounting device 520, the removable mold pin 521 can be easily replaced when the detachable molding pin 521 is broken. Here, a mold device fastening part 528 is provided on one side of the outer periphery of the main body case of the molding die pin detachment type attachment device 520 to be fastened to the outside of the molding part core of the mold device or peripheral device with bolts or the like.

4A and 4B are cross-sectional views illustrating the operation state of the mold release pin attaching device according to the embodiment of the present invention, as viewed from the direction C-C 'of FIG.

As shown in FIGS. 4A and 4B, the mold release mechanism 520 includes a main body case 525, a mounting unit 530, a fixture 590, and a back-and-forth moving means 540.

Here, the main body case 525 is formed in a hollow shape, and a slide surface 526 is formed on the inner circumference of the one end side to be rounded toward the end. That is, the inner circumferential surface on one end side of the main body case 525 is formed of a slide surface 526 formed to be inclined at a predetermined gradient, and the end portion may be rounded.

The attaching unit 530 is disposed to be movable in the front and rear direction along the inner circumference of the main body case 525. The attaching unit 530 is formed at the front end thereof with a receiving groove 531 for receiving the head portion 521a of the removable mold pin And a fixture restraining hole 533 is formed in the rim portion 532 of the receiving groove 531. At this time, it is preferable that the inner circumferential surface of the receiving groove 531 is formed to be linearly extended so as to be in close contact with the outer circumferential surface of the separate mold pin 521 and maintain the upright state.

In addition, a fixture is interposed in the fixture fixation hole 533, and the front end surface of the fixture fixation hole 533 is formed to have a structure that partially coalesces the fixture 590 so as not to be detached, The cross section is preferably formed such that the fixture 590 is openable for retraction. To this end, the cross section of the fixture may be formed in a spherical shape, but is not limited thereto, and may be a square shape or a polygonal shape.

The head end stepped groove 521b of the separable molding die pin 521 is inserted into the fixture restraining hole 533 while the rear end of the fixture 590 is constrained to the inner wall surface of the main body case 525, Lt; RTI ID = 0.0 > 590 < / RTI > On the other hand, when the mounting unit 530 is advanced to move the fixture restraining hole 533 to a position corresponding to the slide surface 526, the fixture 590 is moved toward the expanded inner wall surface side of the slide surface 526 The recessed state of the head end stepped groove 521b of the separate mold pin 521 is released and the separated mold pin 521 can be easily separated.

4A, the fixture 590 is inserted so that one side of the fixture 590 is exposed inside the fixture fixation hole 533, and the exposed end of the fixture 590 is exposed to the head end of the detachable molding die pin 521 The tongue groove 521b is constrained and selectively detachably fixed.

4B, when the mounting unit 530 is moved forward and the rear surface of the fixture fixing hole 533 abuts on the slide surface 526, the fixture 590 is inserted into the slide surface 526, The recessed state of the head end stepped groove 521b of the separate mold pin 521 is released. Accordingly, when the molding die pin 521 is broken, it can be easily separated and replaced.

On the other hand, a molding die detachment-type attachment device (not shown) including a mounting unit for performing a mounting operation in a receiving groove 531 formed at a front end portion of the body case 525, The structure of the separate mold pin 521 to be attached to the mold 520 will be described in detail. Here, the mounting operation refers to a process of restraining and fixing the head portion 521a of the mold-releasing mold pin 521, or releasing the restraining state and operating it in a detachable state, as described above.

Referring to FIGS. 2 and 4A, the separate mold pin 521 includes a body and a head portion 521a extending from an end of the body.

Here, the body may be formed to extend in a long direction so as to be inserted and disposed inside the cavity of the mold apparatus 10, and may be formed in a cylindrical shape or a polygonal shape as shown in FIG.

The head portion 521a extends integrally from the body and is inserted into the receiving groove 531. A portion of the head portion 521a connected to the body is selectively inserted into the fixing hole 590, A stepped groove 521b is formed in which the end portion of the second end portion 530 is constrained. Here, the step groove 521b may be rounded or bent.

At this time, the thickness of the head portion 521a is preferably equal to or less than the thickness of the body so that the separate mold-forming mold pin 521 can be selectively separated inward of the mold apparatus 10 in accordance with the mounting operation Do.

Of course, when the body and the head portion 521a are cylindrical, the diameter of the head portion 521a is preferably less than the diameter of the body.

2, 4A, and 4B, the attaching unit 530 and the fastener 590 of the mold releasing attachment device 520 for forming a mold are engaged with the restraint 590 of the removable mold pin 521 The operator opens the upper mold and the lower mold of the mold apparatus 10 and grasps the replacement target detachable mold pin protruding in the inward direction thereof and pulls out the mold in the inward direction, A simple replacement operation can be completed by inserting a mold pin and performing a mounting operation so that a state of restraint by the mold releasing device 520 for forming metal is performed.

At this time, since the thickness or diameter of the head portion 521a is smaller than the thickness or diameter of the body, the end portion of the replacement-purpose removable mold pin protruding inwardly of the mold apparatus 10 can be easily pulled out.

That is, a through hole corresponding to the outer periphery of the body of the separable molding die pin 521 is formed in the forming part core 15 forming the rim of the cavity, and the thickness or diameter of the head part 521a is larger than the thickness The head portion 521a can easily pass through the rim of the through hole without being interfered with or constrained, even if the operator grips the end portion of the body and easily pulls the end portion of the body inward of the mold apparatus.

Alternatively, if the thickness or diameter of the head portion is larger than the thickness or diameter of the body, even if the head portion is pulled toward the inside of the mold apparatus, the head portion can not be pulled out of the mold apparatus frame. In this case, since the mold releasing apparatus 520 itself is disassembled from the mold apparatus, the releasing mold pin must be removed, so that the replacing operation is very inconvenient and time consuming.

FIG. 5 is a cross-sectional view illustrating the structure of the fixture viewed from the D-D 'cross section of FIG. 4A.

5, the fixtures 590 are provided in a plurality of arcuate shapes and inserted into the fixture constraint holes 533 formed in the fixture unit 530 to be interposed therebetween. Preferably, they are spaced apart from one another by an angle interval of 120 to 180 degrees with respect to the center of each fixture. The fixing member 590 is inserted into the fixture fixing hole 533 and the mounting unit 530 is coupled to the inside of the main body case 525 so that the partial assembly can be completed. Of course, the fixtures 590 may be formed of two or more and spaced apart from each other at various angular intervals rather than 120 ° angular intervals.

4A to 4B, the attaching unit 530 is connected to the back and forth moving means 540 so as to be moved back and forth by an external force. In detail, the back-and-forth moving means 540 is connected to the rear end of the attaching unit 530, and is configured to selectively move the attaching unit 530 back and forth by an external force.

At the rear end of the mounting unit 530, a nut thread groove 527 is formed. The back and forth moving means 540 is screwed to the thread groove 527 so as to be moved in the forward and backward directions as it is rotated and is screwed into the threaded groove 527 of the main body case 525 by a screw coupling structure 544 to a slide bearing 549, And a driving shaft 541 rotatably supported on the inner periphery of the rear end of the driving shaft 541. An engaging hole 543 is formed at an end of the driving shaft 541, That is, by the screw-type screw-engaged structure 544 between the first screw thread formed on the inner periphery of the nut thread groove 527 and the second screw thread formed on the outer periphery of the front end of the drive shaft 541, The attachment unit is selectively advanced or retracted. Here, the thread may be formed of a double layer thread or a triple thread thread, and the cross-sectional shape of the thread may be formed in various shapes such as a trapezoid or a triangle.

Of course, the threaded engagement configuration 544 may be replaced by a ball screw device or the like.

At this time, the external force applying device may be an electric drill tool or the like, and the engaging hole 543 may be formed with a wrench or the like which can be rotated together with a wrench or other work tool inserted in the insertion manner.

FIG. 6 is a partial projected perspective view of a mold releasing device for molding according to an embodiment of the present invention. FIG.

6, the mold releasing device 520 for forming a mold according to the present embodiment is provided with a bevel gear 545 at the rear end of a drive shaft 541, and a worm gear 545 coupled to the bevel gear 545, An external force application device such as an electric drill device in which an AC to DC deceleration motor is applied to the engagement hole 543 may be combined with an engagement hole 543 at an end of the engagement hole 546. [ The rotation axis direction of the drive shaft 541 and the rotation axis direction of the coupling hole 543 may be spaced apart from each other by a predetermined angle.

That is, the portion where the forming die separating type attaching device 520 is disposed due to the outer structure of the complicated mold device is narrow without a space for connecting and disposing the external force applying device. As described above, when the external force application device such as the electric drill device can not be arranged in one direction, the direction of engagement between the engagement hole 543 and the external force application device is changed to the engagement structure of the bevel gear 545 and the worm gear 546 So that an efficient operation can be performed.

Of course, the bevel gear-worm gear coupling structure may be replaced with a universal joint or any other structure if the rotational force transmitted to the coupling hole 543 can be transmitted by changing the angle.

Meanwhile, the cooling structure of the mold releasing attachment device for molding according to an embodiment of the present invention will be described as follows.

Referring to FIGS. 3, 4A and 4B, a long hole 529 is formed on the side of the main body case 525, and the outer periphery of the attachment unit 530 is constrained to both ends of the long hole 529, And the inflow stopper pipe 555a and the outflow stopper pipe 555b, which function as a flow path of the cooling fluid, are connected. That is, the moving distance of the attaching unit 530 in the forward and backward directions is preferably limited by the clearance between the inflow stopper pipe 555a and the outflow stopper pipe 555b and the slot 529. [

The inflow stopper pipe 555a communicates with the inflow pipe 561 inserted into the cooling groove 521c formed inside the molding metal fins 521 and the inflow stopper pipe 555b communicates with the inlet And an outlet pipe 562 which is formed in a double pipe shape surrounding the outer periphery of the rear end of the pipe 561 and whose outer circumference is sealed and joined to the inner circumference of the cooling groove 521c.

Here, the cooling fluid flowing through the inflow stopper pipe 555a is preferably air, but the cooling water may be supplied for the water-cooled structure. The cooling fluid introduced through the inflow stopper pipe 555a is circulated inside the separate mold pin 521 via the inflow pipe 561 to be cooled and discharged through the outflow pipe 562 and the outflow stopper pipe 555b . Accordingly, it is possible to minimize the transfer of the heat of the material that is melted in the die casting or injection process and injected into the cavity into the rear end portion of the mounting unit 530, thereby ensuring stable operation, Effective cooling can also be performed.

As described above, the present invention is not limited to the above-described embodiments, and variations and modifications may be made by those skilled in the art without departing from the scope of the present invention. And such modifications are within the scope of the present invention.

521: separate mold-forming mold pin 525:
530: mounting unit 531: receiving groove
533: fixing fixture hole 590: fixture
540: forward / backward moving means 551:
552: Outflow channel

Claims (5)

And a mounting unit for performing a mounting operation in a receiving groove formed in a front end portion as it is moved back and forth along the inner periphery of the hollow main body case. The mold pin for detachable molding,
A body having an outer periphery corresponding to a through hole formed in a molding core forming an edge of the cavity, the body being inserted and arranged in a cavity of the mold apparatus; And
And a head portion extending from an end of the body and formed to be inserted into the receiving groove and having a step groove selectively restrained by a fixture of the attaching unit in accordance with a mounting operation of the forming die attach device,
Wherein the thickness of the head portion is less than or equal to the thickness of the body so as to selectively separate the separate mold pin from the through hole in the cavity inner side of the cavity in accordance with the mounting operation. delete delete The method according to claim 1,
Wherein a cooling groove is formed in the inside of the molding die pin to allow a cooling fluid to flow therethrough and the cooling groove is communicated with a flow path of a cooling fluid provided inside the molding die for pin separation type attachment device, . delete

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