KR101861565B1

KR101861565B1 - Injection molding apparatus

Info

Publication number: KR101861565B1
Application number: KR1020160000408A
Authority: KR
Inventors: 조윤장; 유수근; 이경인
Original assignee: 주식회사 삼우금형
Priority date: 2016-01-04
Filing date: 2016-01-04
Publication date: 2018-05-29
Also published as: KR20170081412A

Abstract

In the injection molding apparatus for injection molding a molded article such as an automobile part, not only the end portion of the core fin for forming the threaded portion of the molded product and the contact portion of the mold surface of the threaded portion can be precisely matched, The present invention relates to an injection molding apparatus having an improved structure so as to reduce the manufacturing cost of a mold.
Further, the injection molding apparatus of the present invention comprises: a stationary mold having an angular pin arranged diagonally with respect to a fixed side mold; A movable mold provided with a movable side mold plate corresponding to the fixed side mold plate and movable to the fixed mold side and having an ejector for separating a molded product; A slide core having a coupling hole for receiving the angular pin at one side of the movable side mold plate and being operated to move back toward the molded product when the angular pin is inserted into the engaging hole when assembled with the fixed mold; A core pin coupled to the slide core so as to penetrate therethrough in the axial direction and having a support step formed on an outer circumferential surface thereof and having one end formed with a thread pitch on the outer circumferential surface thereof, And a drawing means for drawing the other end of the core pin toward the outer side of the movable mold and separating one end of the core pin from the threaded portion of the molded product, A driven sprocket rotatably provided outside the support block; a drive sprocket connected to the driven sprocket by a chain; and a control unit for controlling the hydraulic pressure A key member recessed on an outer circumferential surface of the other end of the core pin, a key member coupled to the key groove and key-engaged with the driven sprocket, and a spring accommodated in the slide core, And a member.

Description

[0001] INJECTION MOLDING APPARATUS [0002]

The present invention relates to an injection molding apparatus and, more particularly, to an injection molding apparatus for injection molding a molded article such as an automobile part and the like, in which not only the end portion of the core fin for molding the threaded portion of the molded product, The present invention relates to an injection molding apparatus having an improved structure for preventing mold errors such as burrs and the like, which can reduce the manufacturing cost of a mold by performing a mold mating operation with a simple structure.

Typically, an injection molding apparatus is an apparatus for molding synthetic resins such as polyethylene, polypropylene, polystyrene, etc. into various forms. In a state where the mold is closed, the molten resin is injected at a high pressure to fill the space in the mold, The mold is opened and the molded product is taken out.

BACKGROUND ART Conventionally, an injection molding apparatus comprises an injection unit for injecting and melting a synthetic resin material, a molding unit for molding the molten synthetic resin material injected from the injection unit in a mold, and a take-out unit for taking out the article formed by the molding unit have.

In detail, the injection section is a section for infusing the synthetic resin raw material, which is the raw material of the article, into the molding section side, and a hopper for injecting the synthetic resin raw material is provided at the upper section. A screw provided with a driving motor and a nozzle capable of rotating forward and backward by a hydraulic motor so as to melt the raw material of the synthetic resin and to melt the raw material of the synthetic resin while injecting the molten raw material into the molding part side, and a heat transfer part for melting the raw material by wrapping the screw. The lower end of the screw is provided with a control section for controlling the amount of the raw material corresponding to the operation of the operating section provided in the forming section, which will be described later.

The molding part is a molding part for molding the molten synthetic resin raw material injected from the injection part into a specimen. The inside part is provided with a mold composed of a fixing body and a moving body for molding a specimen, and a manipulating part is provided on one side of the front face, Is provided with a cooling water supply portion for cooling the mold of the injection product through the mold.

The take-out part is a place to take out the injection molded product by injection molding with the mold of the above-mentioned molding part, and on the inner side, a moving member which is connected with the moving body of the mold and is capable of being moved forward and backward by hydraulic oil so as to be separated from the fixed body is provided.

For example, when the upper case for an air cleaner of an automobile is injection-molded through a conventional injection molding apparatus, a power source is first applied to drive the injection molding apparatus, and a synthetic resin raw material is supplied to the hopper The operator inputs the condition of the body portion constituting the upper case by operating the operation portion provided at one side of the front side of the forming portion.

Prior art relating to a conventional injection molding apparatus is disclosed in Korean Patent Publication No. 10-1247182, entitled " Device for preventing core movement of an injection molding die " (Registered on Mar. 31, 2013), filed by the same applicant, 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 provided with an inclined guide surface, a closed inclined guide surface guided by the outer guide roller when the mold is closed, and an interference preventing groove for preventing interference with the inner guide roller when the mold is opened.

Another prior art related to the conventional injection molding apparatus is disclosed in Korean Patent Registration No. 10-0441411 entitled " Upper Case Injection Molding Apparatus for Automobile Air Purifier " (Published Date: 2003.03.10) The injection molding apparatus according to any one of claims 1 to 3, wherein the injection molding apparatus comprises: an injection molding device having a cross-sectional shape corresponding to an upper surface of the mold; The thermoplastic polyester elastomer resin material melted so as to maintain the airtightness with the surface is injected to the inside of the mold and the sealing member is injection-molded integrally into the body portion. An injection unit having a primary injection screw for injecting a synthetic resin raw material; A molding part having a mold for molding a synthetic resin raw material injected from an injection part and having a secondary injection screw for injecting a thermoplastic polyester elastomer raw material into the mold; And a take-out portion for taking out the upper case integrally molded with the sealing member by the mold of the forming portion.

The conventional injection molding apparatus is provided with a plurality of driven gears driven by a hydraulic motor and provided with a core pin having a thread pitch formed on the outer peripheral surface thereof for forming a threaded portion of the molded product. The position of the plurality of driven gears can be adjusted by moving the rack gear forward and backward so that the driven gear meshed with the core pin imparts forward and backward movement force to the core pin side .

However, in the case of adjusting the forward and backward displacement of the core pin using a conventional rack gear and a plurality of driven gears, if the end face of the core face and the mold face can not be brought into contact with each other due to variable factors such as gear backlash, If the core pin can not be formed properly or if the core pin is moved forward from the correct position, burrs may occur in the molded product.

Therefore, in the past, it has been troublesome to adjust the position of the core pin by moving the rack gear forward and backward from time to time in order to align the die between the core pin and the screw portion. In the operation of the hydraulic motor, There is a fear that an error may occur in the molding operation of the mold.

Korean Registered Patent No. 10-1247182 entitled " Device for preventing core movement of injection molding die " (registered on March 19, 2013) Korean Patent Registration No. 10-0441411 entitled " Upper Case Injection Molding Apparatus for Automobile Air Purifier " (Published on Mar. 3, 2003)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an injection molding machine for injection molding a molded article, which is capable of accurately matching an end portion of a core pin and a mold surface contact portion of a screw portion, The present invention also provides an injection molding apparatus with improved structure so as to reduce the manufacturing cost of the mold by performing the mold surface matching operation with a simple structure.

According to an aspect of the present invention, there is provided an angular pin assembly including: a stationary mold having an angular pin arranged diagonally with respect to a stationary-side mold; A movable mold provided with a movable side mold plate corresponding to the fixed side mold plate and movable to the fixed mold side and having an ejector for separating a molded product; A slide core having a coupling hole for receiving the angular pin at one side of the movable side mold plate and being operated to move back toward the molded product when the angular pin is inserted into the engaging hole when assembled with the fixed mold; A core pin coupled to the slide core so as to penetrate therethrough in the axial direction and having a support step formed on an outer circumferential surface thereof and having one end formed with a thread pitch on the outer circumferential surface thereof, And a drawing means for drawing the other end of the core pin toward the outer side of the movable mold and separating one end of the core pin from the threaded portion of the molded product, A driven sprocket rotatably provided outside the support block; a drive sprocket connected to the driven sprocket by a chain; and a control unit for controlling the hydraulic pressure A key member recessed on an outer circumferential surface of the other end of the core pin, a key member coupled to the key groove and key-engaged with the driven sprocket, and a spring accommodated in the slide core, And a member.

Wherein the slide core has a receiving space portion in which the core pin portion having the supporting jaw is accommodated, and a first slide that is operated to be retracted such that the inner side surface of the accommodation space portion is in surface contact with the supporting jaw when the movable die and the stationary die are assembled, And a second slide core coupled to the front side of the first slide core and coupled to the core pin so as to be inserted therethrough.

The engaging holes are formed in an oblique shape corresponding to the angular positions of the angular pins.

And the support block is bolted to the front surface of the movable mold to support the driven sprocket and the other end of the core pin.

The spring member has one end supported by the second slide core and the other end supported by the support jaw in contact with the slide core. The spring member is contracted when the slide core is advanced, and is restored when the slide core is moved backward.

The present invention can simplify the structure of the pull-out means for pulling out the other end of the core pin, while keeping the correct position of the core pin by moving the slide core backward or forward in the process of assembling and releasing the movable and stationary dies It has a useful effect of reducing the molding error compared to the conventional gear engagement method and preventing the occurrence of burrs.

1 is a configuration diagram of an injection molding apparatus according to the present invention;
2 is a plan view of Fig.
3 is a perspective view showing the slide core of the present invention.
4 is a schematic view showing a state in which a movable mold and a stationary mold of the present invention are combined.
5 is a schematic view showing a release state of the movable mold and the stationary mold according to the present invention.
6 is a perspective view showing a state in which the other end of the core pin is pulled outward outward by the pull-out means of the present invention.
7 is a view showing a molded article molded by the injection molding apparatus of the present invention.

The injection molding apparatus according to the present invention will be described with reference to Figs. 1 to 7, wherein a round mold-shaped angular pin 150 is fixedly provided on a stationary mold 110 by a fixed mold 100, A movable mold 200 provided with a movable side mold plate 210 corresponding to the fixed side mold plate 110 and movable toward the stationary mold 100 and having an ejector 250 for separating the molded product 10, The engaging hole 315 into which the angular pin 150 is inserted is formed on one side of the movable side mold plate 210 and the angular pin 150 is inserted into the engaging hole 315 when assembled with the stationary mold 100. [ The slide core 300 is coupled to the slide core 300 so as to penetrate the slide core 300 in the axial direction and has a support protrusion 420 formed on the outer circumferential surface thereof and a screw pitch 410 is formed on the outer circumferential surface thereof. A core pin 400 having one end formed therein inserted into the threaded portion 15 of the molded article 10, And a drawing means 500 for pulling the other end of the pin 400 toward the outer side of the movable mold 200 and separating one end of the core pin 400 from the threaded portion 15 of the molded product 10 .

1 and 2, the fixed mold 100 includes a stationary side mold 110 disposed on a side opposite to the movable mold 200 and an angular pin 150 disposed on the fixed side mold 110, Are arranged in the diagonal direction of the photograph.

The movable mold 200 is provided with a movable side mold plate 210 corresponding to the fixed side mold plate 110 on one side and a molded product 10 on the side where the movable side mold plate 210 and the fixed side mold plate 110 are in contact with each other. ) Is provided.

The movable mold 200 is provided with an ejector 250 for separating the molded product 10 that has been molded from the movable side mold plate 210 from the movable side mold plate 210.

3 and 4, the slide core 300 has a receiving space 312 in which a portion of the core pin 400 having the support tabs 420 therein is received, and the movable mold 200 A first slide core 310 which is operated to be retracted so that the inner side surface 312a of the accommodation space 312 is in surface contact with the support step 420 when the stationary mold 100 is assembled, And a second slide core 320 coupled to the front side of the first slide core 310 through a bolt and coupled to the core pin 400 so as to be inserted therethrough.

The engagement hole 315 is formed in the first slide core 310 and has a structure formed in a slanting line corresponding to the angle of the angular pin 150.

One side of the receiving space 312 of the first slide core 310 is brought into surface contact with the supporting jaw 420 to move the core pin 400 in the backward direction.

The drawing unit 500 includes a support block 510 fixed to the front surface of the movable mold 200 and coupled to the other end of the core pin 400 so as to penetrate therethrough, A drive sprocket 530 connected to the driven sprocket 520 by a chain 535 and a hydraulic motor 540 for providing a rotational force to the drive sprocket 530; A key groove 555 recessed at the outer circumferential surface of the other end of the core pin 400 and a key member 550 coupled to the key groove 555 and keyed to the driven sprocket 520.

The support block 510 is bolted to the front surface of the movable mold 200 to support the follower sprocket 520 and the other end of the core pin 400.

The key member 550 has a structure in which the key groove 555 is coupled to receive the lower portion and the upper portion is key-engaged to the driven sprocket 520 coupled to the support block 510.

The drawing means 500 further includes a spring member 560 accommodated in the slide core 300 and applying an elastic supporting force to the supporting jaw 420 side.

The spring member 560 is contracted at the time of forward movement of the slide core 300 as one end is supported by the second slide core 320 and the other end is held in contact with the support step 420, And a compression spring for imparting an elastic force to advance the core pin 400 is adopted.

4, when the movable mold 200 and the stationary mold 100 are combined, the angular pin 150 is inserted into the engagement hole 315 of the first slide core 310, The inner side surface 312a of the accommodating space 312 of the first slide core 310 is in surface contact with the support jaw 420 so that the core The end of the pin 400 and the mold surface of the threaded portion 15 of the molded product 10 are positioned on the same plane coinciding with each other and one end of the core pin 400 is inserted into the threaded portion 15 of the molded product 10 .

One end of the spring member 560 is supported by the second slide core 320 and the other end of the spring member 560 is supported by the support jaw 420 in a state of being accommodated in the accommodation space 312 of the first slide core 310 .

The ends of the second slide core 320 are held in contact with the surface of the molded article 10 as the first slide core 310 and the second slide core 320 are moved backward toward the molded article 10.

5, when the movable mold 200 is separated from the stationary mold 100 and separated from the stationary mold 100, the angular pin 150 is separated from the engagement hole 315 of the first slide core 310 The spring member 560 accommodated in the receiving space 312 of the first slide core 310 is compressed in accordance with the advancing operation of the second slide core 320, do.

At this time, one end of the core pin 400 is inserted into the threaded portion 15 of the molded product 10.

Thereafter, one end of the core pin 400 can be separated from the threaded portion 15 of the molded product 10 by using the drawing means 500.

When the hydraulic motor 540 is driven to rotate and the rotational force of the drive sprocket 530 is transmitted to the driven sprocket 520 through the chain 535, The other end of the core pin 400 is rotated forward and is pulled out by the rotation of the follower sprocket 520 as shown in Fig. 6 because the key member 550 is keyed to the driven sprocket 520 .

After the other end portion of the core pin 400 is pulled out to the front side and the threaded portion 15 of the molded product 10 is released from the one end portion of the core pin 400, 560 is restored to its original state and an elastic force is applied to the support tab 420 of the core pin 400 to increase the force for pulling the other end of the core pin 400 forward, After being drawn out, the molded product 10 is demolded from the mold by using the ejector 250.

It is preferable that the tension of the chain 535 is loosely maintained so as to have an allowance in a normal range and it is possible to adjust the position due to the allowance of the chain 535 even when the driven sprocket 520 is moved.

When the movable mold 200 and the stationary mold 100 are assembled together, the slide core 300 is retracted toward the molded product 10, so that the inner side surface 312a of the accommodating space 312 of the first slide core 310, The core pin 400 is moved back to the side of the molded product 10 so that the end of the core pin 400 is pressed against the surface of the threaded portion 15 of the molded product 10, So as to be brought into contact with each other.

Thus, the molding process of the screw part 15 of the molded product 10 is repeatedly performed in the same manner as described above while repeating the process of combining and releasing the movable mold 200 and the stationary mold 100.

Fig. 7 shows a molded product 10 manufactured by the injection molding apparatus according to the present invention, and it is possible to prevent the occurrence of burrs during molding of the threaded portion 15 having the threaded portion formed on the inner peripheral surface thereof.

Accordingly, in the process of assembling and releasing the movable mold 200 and the stationary mold 100, the slide core 300 can be moved backward or forward to fix the core pin 400, It is possible to simplify the structure of the drawing means 500 for drawing out the other end of the pin 400 and to have a useful effect of reducing the molding error as compared with the conventional gear engagement method.

10: Molded part 15: Screw part
100: stationary mold 110: fixed-side mold plate
150: Angular pin 200: movable mold
210: movable side mold plate 250: ejector
300: slide core 310: first slide core
312: accommodation space part 312a: inner side (of the accommodation space part)
315: engaging hole 320: second slide core
400: Core pin 410: Screw pitch
420: Support jaw 500: Extraction means
510: support block 520: driven sprocket
530: Driving sprocket 535: Chain
540: Hydraulic motor 550: Key member
555: keyway 560: spring member

Claims

A stationary mold 100 having an angular pin 150 arranged diagonally with respect to the stationary side mold 110;
A movable mold 200 having a movable side mold plate 210 corresponding to the fixed side mold plate 110 and movable toward the stationary mold 100 and having an ejector 250 for separating the molded product 10;
The engaging hole 315 for receiving the angular pin 150 is formed on one side of the movable side mold plate 210 and the angular pin 150 is engaged with the engaging hole 315 A slide core 300 which is operated to move back toward the molded article 10 as it is inserted;
One end portion of the slide core 300 which is coupled to the slide core 300 so as to penetrate in the axial direction and has a support step 420 formed on the outer circumferential surface thereof and a screw pitch 410 formed on the outer circumferential surface thereof is inserted into the threaded portion 15 of the molded product 10, 400); And
A drawing means 500 for pulling the other end of the core pin 400 toward the outer side of the movable mold 200 to separate one end of the core pin 400 from the threaded portion 15 of the molded product 10; / RTI >
The drawing unit 500 includes a support block 510 fixed to the front surface of the movable mold 200 and coupled to the other end of the core pin 400 so as to penetrate therethrough, A drive sprocket 530 connected to the driven sprocket 520 by a chain 535 and a hydraulic motor 540 for providing a rotational force to the drive sprocket 530; A key member 550 which is concavely formed on the outer circumferential surface of the other end of the core pin 400 and a key member 550 which is coupled to the key groove 555 and which is keyed to the driven sprocket 520, And a spring member (560) accommodated in the support jaw (420) and applying an elastic support force to the support jaw (420).

The method according to claim 1,
The slide core 300 has a housing space 312 in which the core pin 400 having the support tabs 420 is received. When the movable mold 200 and the stationary mold 100 are assembled together, A first slide core 310 which is operated to be retracted such that the inner side 312a of the accommodation space 312 is in surface contact with the support step 420,
And a second slide core (320) coupled to the front side of the first slide core (310) and interlocked with the core pin (400) so as to be inserted therethrough.

The method according to claim 1,
Wherein the engagement hole (315) is formed in an oblique shape corresponding to an arrangement angle of the angular pin (150).

The method according to claim 1,
Wherein the support block (510) is bolted to the front surface of the movable mold (200) to support the follower sprocket (520) and the other end of the core pin (400).

The method according to claim 1,
The spring member 560 has one end supported by the second slide core 320 and the other end supported in contact with the support step 420. The spring member 560 is contracted when the slide core 300 is advanced, Is restored to its original state during a backward movement of the injection molding machine.