KR101959058B1 - Discharging devices of mold core - Google Patents

Abstract

The present invention relates to a mold core discharging device, and more specifically, a mold core discharging device with an improved structure, in which a cutting piece of a jig body and a lower body of a pin body are inserted into a combining hole formed in a mold core in a process of drawing the mold core of an injection mold, and when the pin body is lifted in an inserted state, the outside of the cutting piece of the jig body is extended to adhere to an inner circumference surface of the combining hole, thereby being coupled to the mold core such that a crane is connected to a handle and accordingly, the mold core is lifted and drawn to the outside. The mold core discharging device comprises a pin body, a jig body, a nut member, and the handle. The pin body comprises: an upper body including a small diameter unit which is inserted to be coupled to an assembly hole of the handle, provided in a lower part of the small diameter unit, and formed with a male screw thread on an outer circumferential surface thereof to be inserted into a hollow of the jig body; and a lower body provided in a lower part of the upper body, inserted into the combining hole formed in the mold core of the injection mold, and having an outer diameter becoming increased from an upper part toward a lower part. The jig body comprises: a coupling unit provided with a female screw thread on an inner circumferential surface of an upper hollow having a smaller inner diameter than that of a lower hollow in order to be coupled to the male screw thread formed in the upper body of the pin body; and the cutting piece formed in a lower part thereof, spread and press-fitted to be in contact with an inner circumferential surface of the combining hole when the lower body is upwardly moved, and including a plurality of slot grooves which are returned by self-elasticity. The nut member is integrally combined with an outer circumferential surface of the jig body. The handle includes the assembly hole into which the small diameter unit of the pin body is inserted to be integrally combined.

Description

{DISCHARGING DEVICES OF MOLD CORE}

[0001] The present invention relates to a mold core drawing apparatus, and more particularly, to a mold core drawing apparatus in which, during a drawing operation for drawing a mold core of an injection mold, a jig body and a lower body of a pin body are inserted into a coupling hole formed in a mold core, The outer side of the jig body of the jig body is extended so as to be closely contacted with the inner circumferential surface of the jig when the pin body rises and is coupled to the mold core so that a crane is connected to the knob to draw out the mold core, To a mold core drawing apparatus.

In general, an injection-molding mold is composed of a stationary mold and a movable mold in which a cavity is formed in a closed state. In a state in which the mold is closed, a molten resin is injected into the cavity to mold the molded article, The mold is opened to take out the molded product.

Conventionally, injection molding molds have a core and an angular pin for forming an undercut portion in a molded product between a stationary mold and a movable mold. When the movable mold is advanced and the stationary mold and the movable mold are closed, And the movable die is retracted so that the core is released from the undercut portion of the molded product by the action of the angular pin in the process of opening the stationary mold and the movable mold.

However, in the conventional injection molding die, the core is coupled to the end of the angular pin, and the fixed die is provided with a guide hole for guiding the angular pin. The angular pin is operated so that the core at the tip thereof is pulled out from the undercut portion The angular pin and the core are shaken in the process of coming out, so that interference occurs between the core and the undercut portion of the molded product, thereby damaging the undercut portion of the molded product, resulting in defective molding.

As disclosed in Korean Patent No. 10-1247182 entitled " Device for preventing core movement of an injection molding die "(registered on March 31, 2013), the applicant of the present invention has proposed a technique And a stationary mold fixing plate; A movable mold having a movable mold plate and a movable mold stationary plate; A core for molding the protrusion and the undercut portion of the molded product; And core operating and supporting means for supporting the core to operate and not to flow, wherein the core actuating and supporting means comprises a slide block mounted on the front and rear sides between the stationary mold plate and the stationary mold stationary plate, and; A linear actuator for driving the slide block to move left and right; A core operating plate movably installed between the slide blocks to support the core pin so as to be slidable up and down, and to interlock with the slide block when the mold is closed without interlocking with the slide block when the mold is opened; An outer guide roller supported on upper and lower sides of the core actuating plate so as to be rotatable by a pair of back and forth; An inner guide roller rotatably supported on the slide block by a pair of back and forth; The movable mold plate being horizontally symmetrically arranged on the front and rear sides of the movable mold plate so as to be rotatable in the up and down direction, And a guide lever having an inclined guide surface, a sloped guide surface guided by the outer guide roller when the mold is closed, and an interference prevention groove for preventing interference with the inner guide roller when the mold is opened.

Another prior art related to the conventional mold core is disclosed in Korean Patent Registration No. 10-0348101 entitled " Core-compatible mold structure "(registered on July 26, 2002) A take-out means including a base frame formed in the order of a top plate, a bottom plate, a bottom plate, a foot plate, a leg plate, a top plate and an insulating plate, a plate provided on the side of the lower plate, a return pin and a takeout pin, And a core coupled to the support plate and the lower plate, wherein the upper and lower cores are formed to be compatible with and detachable from the coupling portions of the base frame, And the core unit of the basic frame is also formed in correspondence to the core bundle, and the takeout unit is formed of a core bundle that is formed to be easily compatible with and detachable from the core bundle, will be.

However, in the prior arts, when a take-out operation is to be performed due to maintenance or replacement of a mold core, a tab is formed on a mold core, and an eye bolt is fastened to the processed tab to pull the eye bolt to take out the mold core There is a disadvantage in that it is difficult to apply an eye bolt to a mold core in which tapping is not allowed, or when a mold lifting mechanism is brought into contact with a mold core to take out the mold core by magnetic force, There is no disadvantage.

Korean Patent No. 10-1247182 entitled " Device for preventing core flow in injection molding mold "(registered on March 19, 2013) Korean Registered Patent No. 10-0348101 entitled "Core-compatible mold structure" (registered on July 26, 2002)

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a method of manufacturing an injection mold, The upper body of the jig body is extended so as to be in close contact with the inner circumferential surface of the engaging hole to be coupled to the mold core so that a crane is connected to the handle so that the mold core is pulled out to the outside And to provide a mold core take-out apparatus in which the structure is improved.

In order to achieve the above object, according to the present invention, there is provided an upper body including a small diameter portion inserted into an assembly hole of a handle, an upper body provided at a lower portion of the small diameter portion and having a male thread formed on an outer peripheral surface thereof, And a lower body which is provided at a lower portion of the injection mold and is formed to be fitted into a coupling hole formed in the mold core of the injection mold and formed to have an outer diameter larger from the upper side to the lower side; A fastening part having an inner circumferential surface of an upper hollow having an inner diameter smaller than the lower hollow inner diameter so as to be engaged with a male thread formed on the upper body of the pin body, A jig body including a plurality of slotted grooves which are press-fit and returnable by self-elasticity; A nut member integrally coupled to an outer circumferential surface of the jig body; And a handle having a small diameter portion of the pin body and an assembling hole integrally coupled to the handle.

And a circumferential groove is formed between the upper body and the lower body of the pin body, the circumferential groove being concave around the outer circumferential surface.

The handle, the small-diameter portion of the upper body, and the jig body and the nut member are welded together.

The handle is configured to be connected to the wire rope.

The present invention relates to a method for manufacturing a metal mold, in which a mold cavity is formed in a mold core in the process of drawing a mold core from the injection mold to the outside, and a lower body of the jig body and a lower body of the jig body enter the joint hole, Since the incision member is widened along the outer circumferential surface of the body and is brought into close contact with the inner circumferential surface of the engaging hole to be engaged in the press-fit state, even if the tapping is not allowed or the mold core is difficult to be withdrawn with magnetism, .

In the present invention, since the hollow portion of the jig body is provided with a fastening portion having an inner diameter smaller than the upper and lower hollow inner diameters and having an inner peripheral surface formed with a female screw, the male thread formed on the outer peripheral surface of the upper body of the pin body is fastened to the female thread of the fastening portion. So that the lifting and lowering operation of the pin body can be performed smoothly.

Further, since the nut member is integrally welded to the outer peripheral surface of the jig body, the present invention has an advantage that the jig body can be easily fixed using a tool such as a spanner or a wrench from the outside.

Since the small diameter portion having a diameter smaller than the diameter of the lower portion is formed in the upper end portion of the upper body so as to be integrated into the assembly hole of the handle and integrated by welding, the small diameter portion can be easily welded in a state of being coupled to the assembly hole of the handle.

1 is an exploded perspective view of a mold core drawing apparatus according to the present invention;
2 is an assembled state diagram of Fig.
3 is a front view of the pin body of the present invention.
4 is an enlarged cross-sectional view showing a screw joint portion between the pin body and the jig body of the present invention.
FIG. 5 is a use state showing a state in which the pin body of the present invention and the lower end of the jig body enter the engaging hole of the mold core.
FIG. 6 is a state of use in which a lower end of the jig body of the present invention is moved downward, and a cutter is expanded into an outer side so that the inner cutter is in close contact with the inner side of the joint hole.

1 to 6, a mold core take-out apparatus according to the present invention includes a small diameter portion 140 inserted into an assembly hole 310 of a handle 300 and a small diameter portion 140 formed in a lower portion of the small diameter portion 140 An upper body 120 formed with a male thread on the outer circumferential surface and inserted into the hollow 205 of the jig body 200 and a coupling body 120 provided on the lower portion of the upper body 120 and formed on the mold core 10 of the injection mold. And a lower body (130) which is fitted to the lower body (15) and formed so as to have a larger outer diameter from the upper side to the lower side; A coupling part 220 having an inner circumferential surface of an upper hollow 205A having an inner diameter smaller than an inner diameter of the lower hollow 205B to be engaged with a male thread formed on the upper body 120 of the pin body 100, (210) provided with a plurality of slot grooves (215) that are opened by being pushed in contact with the inner circumferential surface of the engaging hole (15) when the lower body (130) A jig body 200; A nut member 250 integrally coupled to an outer circumferential surface of the jig body 200; And a handle 300 integrally connected to an upper end of the upper body 120 and connected to a wire rope for connection with a crane (not shown).

1 and 2, the pin body 100 includes a lower body 130 to be inserted into the fitting hole 15 of the mold core 10 of the injection mold, and a lower body 130 to be inserted into the hollow 205 of the jig body 200. And the upper body 120 and the lower body 130 are divided by a peripheral groove 110 formed concavely around the outer peripheral surface.

As shown in FIGS. 1 and 3, the lower body 130 of the pin body 100 is formed to have a larger outer diameter so as to have a larger thickness t1 from the upper side to the lower side.

The upper body 120 is inserted into an assembly hole 310 of the handle 300 and formed with a small diameter portion 140 having a diameter smaller than that of the lower portion so as to be integrated by welding.

The handle 300 has a structure in which the upper end of the small body part 140 of the upper body 120 is inserted into an assembly hole 310 formed at the center and welded and connected to a crane while being connected to a wire rope .

The jig body 200 has a hollow 205 through which the upper portion and the lower portion communicate with each other. The upper portion of the hollow portion 205A of the hollow portion 205A has a female threaded portion formed on the upper portion of the inner circumferential surface thereof.

The jig body 200 is integrally joined to the outer circumferential surface by welding or the like and is provided with a fixing force so as not to be rotated when the knob 300 and the pin body 100 are rotated in a state of being gripped by a tool such as a spanner or a wrench. The nut member 250 is provided.

Referring to FIG. 4, the jig body 200 has a female thread corresponding to a male thread of the upper body 120 on an inner circumferential surface of the hollow 205 and has an inner diameter smaller than an inner diameter of the lower hollow 205B. A fastening portion 220 having a hollow female thread is formed in the hollow 205A.

The upper hollow portion 205A of the coupling portion 220 is formed to have an inner diameter smaller than that of the lower hollow portion 205B of the hollow 205 of the jig body 200, Thereby allowing the pin body 100 to move up and down with respect to the fixed jig body 200 when the pin body 100 rotates.

The jig body 200 has a plurality of slot grooves 215 formed at its lower portion in the longitudinal direction to form an incision 210 in the form of an incision.

The incisal piece 210 slides downward along the lower body 130 of the pin body 100 during a lowering operation of the jig body 200 and has a structural property of a lower body 130 having a larger diameter from the upper side to the lower side Through the slotted groove 215. As shown in Fig.

As shown in FIG. 2, the assembly of the handle 300, the pin body 100, and the jig body 200 will be described first. The male thread of the pin body 100 is fastened to the female thread of the fastening part 220 and the small diameter part 140 of the pin body 100 is fastened to the fastening part 220 of the jig body 200. [ After the protruded portion of the hollow body 205 is advanced into the assembly hole 310 of the handle 300 and then the inner circumferential surface of the assembly hole 310 and the small diameter portion 140 which is the upper end of the pin body 100 are welded together Assembly is completed.

At this time, the lower body 130 of the pin body 100 is coupled to be accommodated in the discrete piece 210 having the plurality of slot grooves 215 formed therein.

5 and 6, when the mold core 10 is separated from the injection mold, the lower body (not shown) of the pin body 100 is inserted into the coupling hole 15 formed in the mold core 10 130 and the jig body 200 are inserted and the knob 300 and the pin body 100 are rotated with the nut member 250 fixed with a tool such as a wrench or a spanner, The male thread of the body 100 spirals along the female thread of the fastening part 220 to move the pin body 100 upward.

Referring to FIG. 6 again, when the pin body 100 is lifted up, due to the characteristics of the lower body 130 whose diameter increases from the upper side to the lower side, the separable piece 210 spreads outward, And are joined in a press-fitting manner.

The mold core 10 can be separated from the injection mold by lifting the grip 300 connected to the wire rope by lifting the gripping piece 210 into the inner circumferential surface of the coupling hole 15 and lifting the grip 300 with the crane.

When the handle 300 and the pin body 100 are rotated in the other direction while the nut member 250 is gripped after separating the mold core 10 from the injection mold, the fastening portion 220 of the jig body 200, The male thread of the pin body 100 is rotated and the pin body 100 is lowered along the female threads formed on the inner circumferential surface of the engaging hole 15 while the plurality of discrete pieces 210 are returned to their original positions, The separated piece 210 of the jig body 200 and the lower body 130 of the pin body 100 can be separated from the engaging hole 15. [

When the jig body 200 and the lower end of the pin body 100 are inserted into the engaging holes 15 of the mold core 10 as described above even when the new mold core 10 is transferred to the crane for assembling, It is possible to move the pin body 100 to the crane in a state in which the split piece 210 is pressed into the inner peripheral surface of the engagement hole 15 by raising the pin body 100.

Therefore, the present invention is characterized in that the engaging hole 15 is formed in the mold core 10 in the process of pulling the mold core 10 out of the injection mold and the engaging hole 15 is formed in the engaging hole 15 of the jig body 200 210 and the lower body 130 of the pin body 100 are moved in the upward direction of the lower body 130 when the pin body 100 is lifted up, 15 so that the mold core 10 can be easily drawn out from the injection mold even when the tapping is not allowed or the mold core 10 is difficult to draw out by magnetism .

4, the inner upper hollow 205A of the jig body 200 hollow 205 has an inner diameter smaller than the inner diameter of the lower hollow 205B and a fastening part 220 The male thread formed on the outer circumferential surface of the upper body 120 of the pin body 100 is fastened to the female thread of the fastening part 220 so that the pin body 100 can be smoothly moved up and down.

Since the nut member 250 is integrally welded to the outer peripheral surface of the jig body 200, the present invention has an advantage that the jig body 200 can be easily fixed using a tool such as a spanner or a wrench from the outside .

Since the small diameter portion 140 having a diameter smaller than the diameter of the lower portion is formed at the upper end of the upper body 120 so as to be inserted into the assembly hole 310 of the handle 300 and welded together, And can be welded while being coupled to the assembly hole 310 of the handle 300.

Although the present invention has been described in detail with reference to specific embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by the appended claims, as well as the appended claims.

That is, the present invention described above is not limited to the above-described specific preferred embodiments, and any person skilled in the art will be allowed to use the present invention without departing from the gist of the present invention. It will be understood that various modifications can be made without departing from the spirit and scope of the invention as defined in the appended claims.

10: mold core 15: engaging hole
100: pin body 110: peripheral groove
120: upper body 130: lower body
140: Small diameter part 200: Jig body
205: hollow 210:
215: slot groove 220: fastening portion
250: nut member 300: handle
310: Assembly

Claims (4)

A small diameter part 140 inserted into the assembly hole 310 of the handle 300 and a small thread part 140 formed on the outer circumferential surface of the small diameter part 140 and inserted into the hollow 205 of the jig body 200, A lower body formed to be fitted in an engaging hole 15 formed in the mold core 10 of the injection mold and provided at an upper portion of the upper body 120 and having an outer diameter larger from the upper side toward the lower side, A pin body 100 made of a body 130;
A coupling part 220 having an inner circumferential surface of an upper hollow 205A having an inner diameter smaller than an inner diameter of the lower hollow 205B to be engaged with a male thread formed on the upper body 120 of the pin body 100, (210) provided with a plurality of slot grooves (215) that are opened by being pushed in contact with the inner circumferential surface of the engaging hole (15) when the lower body (130) A jig body 200;
A nut member 250 integrally coupled to an outer circumferential surface of the jig body 200; And
And a handle (300) having an assembly hole (310) into which the small diameter part (140) of the pin body (100) is inserted and integrally joined. The method according to claim 1,
Further comprising a circumferential groove (110) formed between the upper body (120) and the lower body (130) of the pin body (100) and recessed around an outer circumferential surface thereof. The method according to claim 1,
Wherein the handle 300 and the small body 140 of the upper body 120 and the body 200 and the nut member 250 are welded together. The method according to claim 1,
Wherein the handle (300) is configured to be connected to a wire rope.

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