KR101736891B1 - Apparatus and method for forming bellows - Google Patents

Apparatus and method for forming bellows Download PDF

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Publication number
KR101736891B1
KR101736891B1 KR1020160015258A KR20160015258A KR101736891B1 KR 101736891 B1 KR101736891 B1 KR 101736891B1 KR 1020160015258 A KR1020160015258 A KR 1020160015258A KR 20160015258 A KR20160015258 A KR 20160015258A KR 101736891 B1 KR101736891 B1 KR 101736891B1
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KR
South Korea
Prior art keywords
parison
pin
bellows
fin
molding
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KR1020160015258A
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Korean (ko)
Inventor
김성술
안강노
김형진
김형준
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주식회사 디엠씨
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/0015—Making articles of indefinite length, e.g. corrugated tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • B29C49/421—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4242—Means for deforming the parison prior to the blowing operation
    • B29C49/4247—Means for deforming the parison prior to the blowing operation using spreading or extending means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D16/00—Producing articles with corrugations

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

The present invention relates to an apparatus and a method for molding bellows. Especially, a large diameter part of the bellows is located at a lower end of a molding mold, and a small diameter part is located at an upper end. After an upper pin and a lower pin are arranged on upper and lower ends of the molding mold, a parison is expanded to a certain amount by air before the lower pin goes upward inside the parison, and prevents contact with the lower pin, so as to prevent defects of bellows products, and the upper pin, on which the narrow part is formed, is connected to the upper pin, while going upwards, so as to mold the shape of an inside edge of a neck part of the narrow part.

Description

[0001] APPARATUS AND METHOD FOR FORMING BELLOWS [0002]

More particularly, the present invention relates to an apparatus and a method for forming a bellows, and more particularly, to a bellows for molding a bellows, in which a bellows large diameter portion is positioned at a lower end of a molding die, a small diameter portion is located at an upper end, upper and lower fins are disposed at upper and lower ends of a molding die, The lower pin is lifted up by the upper pin to prevent the lower pin from contacting with the parison so that the bellows product is not defective and the lower pin is upwardly engaged with the upper pin where the small diameter portion is formed, The shape of the inner edge portion of the neck portion of the neck can be molded as desired.

In general, to form a bellows, a parison having a hollow pipe shape is hollowed in a molding die, and then the parison is heated and expanded by injecting an internal body of the parison, that is, heated air at a predetermined pressure, After the mold is cooled, the mold is opened to take out the finished product.

Such a molding apparatus will be described with reference to Figs. 1 and 2. Fig.

As shown in the figure, the molten thermoplastic synthetic resin is extruded through a parison feeder 11 into a hollow parison (PR) having a hollow pipe shape and descended.

When the parisons PR are formed, the pair of left and right vertical forming dies DI are slid in a horizontal direction facing each other to be opened, so that the parison PR, which is extruded and descended, As shown in FIG.

The blow pin 5 is simultaneously lifted by the hydraulic cylinder when the parison PR is put into the mold DI so that the upper end of the blow pin 5 is pressed against the mold DI, The mold is inserted to the inner upper end of the parison PR and stopped at a desired position, and then the molding die DI is closed at the time when the parison PR is completely lowered. At this time, the small diameter portion of the blow pin 5 is located at the center in the small diameter d of the bellows molded body B, the thickness in the circumferential direction of the small diameter portion d of the bellows molded body B is made constant, Are formed at equal intervals in the circumferential direction.

The upper end of the blow pin 5 is inserted to the inner upper end of the parison PR and heated air is supplied to the parison PR so that the parison PR is inflated into the finished product of the bellows provided in the molding space of the forming die DI (B) having hollows.

However, such conventional techniques have the following problems.

Firstly, according to the prior art, since the small diameter portion of the bellows is positioned at the upper end of the molding die and the blow pin moves from the lower portion to the upper portion, the bell pin is moved upwardly into contact with the non- Thereby causing defects.

Secondly, there is a problem that it is difficult to realize the shape of the inner edge portion of the bellows small-diameter portion as desired.

On the other hand, the above-described bellows-forming apparatus itself is widely known and is described in detail in the following prior art documents, and a description thereof will be omitted.

Japanese Laid-Open Patent Application No. 1994-000867 Japanese Laid Open Patent Application No. 1994-034930 Korean Patent Publication No. 10-1992-0006093 Korean Patent No. 10-1240914 Korean Patent No. 10-1421101

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a bellows type bellows with a bellows large diameter portion disposed at a lower end of a molding die, The bellows product is prevented from being defective by preventing the lower pin and the parison from contacting each other by expanding the parison to a certain extent by the whole air, while the lower pin is upwardly engaged with the upper pin formed with the small diameter portion, And it is an object of the present invention to provide a bellows molding apparatus and method capable of molding an edge shape as desired.

However, the object of the present invention is not limited to the above-mentioned object, and another object which is not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, the present invention provides a molding apparatus including a pair of molding dies DI separated from each other and provided with a parison feeder 110 at an upper portion thereof, An upper pin 120 installed on a bottom surface of the molding die DI to move upward and downward in the molding die DI and to move up and down the upper pin 120, Wherein the small diameter portion of the forming die DI is located at the upper portion and the large diameter portion is located at the lower portion, and the molding die DI (D) of the bellows is formed around the upper pin (120) when the upper pin (120) and the upper pin (120) are coupled to each other.

The upper pin 120 includes a cylindrical upper pin body 121 and a protrusion 122 protruding from the outer surface of the upper pin body 121 and having a ring shape and formed in a plurality It is also possible to do.

Further, the present invention is a method of forming a bellows using the molding apparatus, wherein the upper pin 120 performs preliminary blowing to blow air into the parison PR, There is another feature in the bellows molding method in which the bellows is advanced into the cavity PR to perform the molding blow.

According to another aspect of the present invention, there is provided a method of molding a bellows using the molding apparatus, wherein a pair of the molding dies DI are separated from each other and the upper fin 120 is lowered a certain distance, A second step S120 in which the parison PR descends to the lower fin 130, a third step S130 in which the separated forming die D1 is closed, (S140) in which air is introduced into the parison (PR) from the upper fin (120) to preliminarily blow the parison, and a fourth step (S140) of moving the lower fin (130) A sixth step S160 of blowing air into the parison PR through the lower fin 130 to form a parison; A seventh step S170 of raising the upper pin 130 by a predetermined distance after a certain distance is opened and a seventh step S170 of opening the pair of forming dies DI and opening the bellows B First, there is another characteristic and in step 8 (S180), the bellows-forming method comprising a ninth step of raising the upper pin 120 is lowered to the lower pin (130) (S190) to.

At this time, it is also possible that the eighth step (S180) grasps and extracts the bellows (B) formed by the robot.

The bottom surface 120L of the upper fin 120 and the upper surface 130L of the lower fin 130 are in contact with or separated from each other to form a parting line while a gap between the upper fin 120 and the mold DI The parison PR is filled to fill the gap between the upper surface 130L of the lower pin 130 and the mold DI, It is also possible to form the inner edge portion E of the small diameter portion (d) of the bellows (B).

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

According to the present invention described above, the parison is inflated to a certain degree by the air before the lower pin is lifted into the parison so as to prevent the lower pin from contacting the parison, thereby preventing defects of the bellows product, There is an effect that the shape of the inner edge portion of the neck portion of the small-diameter portion can be formed as desired by making the lower pin upwardly engage with the upper pin.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a principal part schematically showing a supply state of parison in a conventional blow molding apparatus;
Fig. 2 is a longitudinal sectional view of the main part schematically showing the blow molding state of the bellows in the conventional blow molding apparatus,
3 to 11 are a schematic view and a sectional view showing a blow molding apparatus and a molding procedure according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following embodiments are not intended to limit the scope of the present invention, but merely as exemplifications of the constituent elements set forth in the claims of the present invention, and are included in technical ideas throughout the specification of the present invention, Embodiments that include components replaceable as equivalents in the elements may be included within the scope of the present invention.

3 to 11 are schematic and sectional views showing a blow molding apparatus and a molding procedure according to an embodiment of the present invention.

Example

The bellows-forming apparatus 100 of the present invention comprises a pair of forming dies DI, which are separated and combined with each other as shown in Fig. 3 and on which a parison feeder 110 is installed.

At this time, the pair of forming die DI and parison feeder 110 can be applied in the same manner as in the prior art, so that redundant description and illustration thereof will be omitted.

The parison feeder 110 is installed in the upper portion of the forming die DI and is inserted into the parison feeder 110 to move up and down within the forming die DI, And an upper pin 120 for blowing air to the upper surface of the housing.

A lower pin 130 is mounted on the lower side of the forming die DI so that the lower pin 130 can move up and down.

The small diameter portion of the forming die DI is located at the upper portion and the large diameter portion is located at the lower portion and the small diameter portion d of the bellows is formed around the upper fin 120 when the molding dies DI are mutually coupled (See Fig. 11)

That is, the molding apparatus 100 of the present invention includes an upper fin 120 and a lower fin 130 which are lifted and lowered in a forming die DI, and the bottom of the upper fin 120 is connected to the lower fin 130, Lt; / RTI >

For this purpose, the upper pin 120 and the lower pin 130 may be mutually male and female.

3, the upper pin 120 includes a cylindrical upper pin body 121 and a plurality of protrusions 130 protruding from the outer surface of the upper pin body 121 and having a ring shape, (122).

A parison may be formed around the protrusion 122 to form a concave shape inside the small diameter portion of the bellows, which will be described later.

The upper fin 120 and the lower fin 130 blow air into the parison. For this purpose, a passageway through which air can flow can be formed as shown in the figure, and air (Not shown).

The molding die DI can be separated and combined as a pair as in the prior art, and a widely known hydraulic or pneumatic cylinder can be used. For molding the upper and lower pins 120 and 130, A hydraulic or pneumatic cylinder can be used as shown in FIG.

Hereinafter, a method of forming the bellows using the bellows molding apparatus 100 of the present invention described above with reference to Figs. 3 to 11 will be described.

The forming method of the present invention is such that after the upper fin 120 performs preliminary blowing to blow air into the parison PR, the lower fin 130 enters the inside of the parison PR, To perform the blowing process with the air coming out of the fin 130.

That is, conventionally, when the blow pin is moved upwardly into the parison, the parison is brought into contact with the parison that has not yet inflated, resulting in a defect.

The present invention solves this problem, and performs a preliminary blowing process in which air is blown into the parison through the upper fin (120) before the lower pin (130) rises to inflate the parison (PR).

By this method, the lower pin 130 does not come into contact with the inside of the parison, and the product defect can be prevented.

This will be described in more detail below.

3, a first step S110 in which the upper fin 120 is lowered by a certain distance and the lower fin 130 is elevated by a predetermined distance in a state in which the pair of forming dies DI are separated from each other, .

In the first step S110, the upper fin 120 and the lower fin 130 can be lowered or raised at a distance of, for example, 30 mm. Also, the upper pin 120 and the lower pin 130 may move simultaneously or separately.

Then, as shown in FIG. 4, the second step S120 in which the parison PR descends to the lower pin 130 is performed. The parison PR can be inputted through the parison feeder 110 and descend to the lower pin 130, which can be applied in the same way as in the prior art, and thus detailed description and illustration are omitted.

After the second step S120, a third step S130 is performed in which the separated forming die D1 is closed as shown in FIG.

At this time, the closing speed of the forming die DI can be changed from high speed to low speed. This is to prevent the mold DI from being damaged by allowing the mold to close at a certain distance.

5, after the third step S130 is performed, air is introduced into the parison PR from the upper fin 120 to pre-blow the parison PR, (S140).

That is, the parison PR is expanded before the lower pin 130 is raised by the fourth step S140 so that the lower pin 130 is not brought into contact with the inner surface of the parison PR, It is possible to prevent the defective molding of the mold.

Meanwhile, air flows into the upper fin 120 to allow the air to flow into the parison PR from the upper fin 120. At the same time, air is supplied to the upper fin 120, (Not shown), which is a well-known technology, and thus detailed description and illustration are omitted.

6, after the fourth step S140 of preliminarily blowing the parison PR, the lower pin 130 is moved upward to be coupled with the lower surface of the upper pin 120, Step 5 (S150) is performed.

At this time, the parison PR is filled between the upper fin 120 and the forming die DI to form the small diameter portion d of the bellows.

Since the parison PR is filled between the forming die DI and the lower fin 130, it is formed according to the shape of the forming die DI and the lower fin 130. Therefore, the shape of the inner edge portion E of the neck portion of the small diameter portion d can be formed as desired.

6 and 11, the lower pin 130 is upwardly engaged with the upper pin 120 on which the small diameter portion d of the bellows is formed, so that the shape of the inner edge portion E of the neck portion of the small diameter portion It can be molded as desired.

That is, the bottom surface 120L of the upper fin 120 and the upper surface 130L of the lower fin 130 are in contact with or separated from each other to form a parting line.

In other words, the second step S120 in which the parison PR descends to the lower fin 130, the third step S130 in which the separated forming die D1 is closed, A fifth step S140 in which air is introduced into the parison PR and preliminary blowing of the parison is performed and then the lower pin 130 is raised to be coupled with the bottom surface of the upper pin 120 The bottom surface 120L of the upper fin 120 and the upper surface 130L of the lower fin 130 are brought into contact with each other to form a parting line.

The space between the upper pin 120 and the mold DI is filled with a parison PR so that the small diameter portion d of the bellows B is formed, .

The parison PR is filled between the upper surface 130L of the lower pin 130 and the mold DI to form the inner edge E of the small diameter portion d of the bellows B.

In other words, the inner edge E of the small diameter portion d can be formed according to the shape of the bottom surface 120L of the top pin 120 forming the parting line and the top surface 130L of the bottom pin 130, The inner edge portion E can be formed in a desired shape or size.

The shape of the inner edge portion E is formed in the shape of the small diameter portion D of the bellows B after the blow pin 5 has been lifted up and inserted into the upper side of the mold DI as shown in FIG. It is difficult to form a desired shape as desired.

That is, in order to increase the inner diameter of the inner edge portion E, the diameter of the bellows B itself must be increased and the angle of the inner edge portion E is also difficult to adjust easily.

The upper pin 120 and the lower pin 130 are coupled to each other to form a parting line therebetween, so that the bottom surface 120L of the upper pin 120 and the lower surface The shape of the small diameter portion d and the inner edge portion E is formed along the parting line formed by the upper surface 130L of the pin 130 so that the shape of the inner edge portion E can be freely formed.

According to the present invention, since the lower pin 130 is in contact with the upper pin 120 along the parting line, the lower pin 130 is disposed more accurately and stably so that a higher quality bellows B is manufactured can do.

In addition, as shown in FIG. 2, in the prior art, when the bellows is taken out, in the prior art, the lowering distance of the blow pin 5 located at the small diameter portion d is long and damage to the small diameter portion However, according to the present invention, the lowering distance of the upper pin 120 located at the small diameter portion d is short, and there is little possibility that the small diameter portion d is damaged.

Then, as shown in FIG. 7, air is injected into the parison PR from the lower fin 130, and a sixth step (S160) of blow molding the parison is performed.

At this time, a path for air to flow into the lower fin 130 and an air supply unit (not shown) may be provided to supply the air into the parison PR, which is applicable to the prior art Therefore, redundant description and illustration are omitted.

After the parison is blown by the sixth step S160, the molding die DI is opened at a predetermined distance as shown in FIG. 8, and then the upper fin 130 is elevated by a predetermined distance S170).

In the seventh step S170, the forming die DI can be opened, for example, 1 mm to 2 mm, and the upper fin 130 has a length of 2 mm to 5 mm from the upper portion of the small diameter portion to the lower end portion of the upper fin 120 It can be increased by the distance left.

Thereafter, as shown in Fig. 9, an eighth step (S180) of opening the pair of forming dies DI and taking out the bellows B is performed.

At this time, the eighth step S180 may be performed by grasping and taking out the formed bellows B using the robot.

After the bellows B is taken out in the eighth step S180, a ninth step S190 is performed in which the upper fin 120 is lowered and the lower fin 130 is lowered as shown in FIG. 10 .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification or improvement is possible.

It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

110: parcel feeder 120: upper pin
121: upper pin body 122:
130: Lower pin

Claims (6)

A pair of forming dies DI which are mutually separated and combined and provided with a parison feeder 110,
An upper fin 120 inserted into the parison feeder 110 to move up and down inside the forming die DI to introduce air into the parison PR,
A lower pin 130 installed on the bottom surface of the forming die DI and moving up and down inside the forming die DI to engage with the bottom surface of the upper fin 120 and inject air into the parison PR; Including,
Wherein the small diameter portion of the molding die DI is located at the upper portion and the large diameter portion is located at the lower portion so that the small diameter portion d of the bellows is formed around the upper fin 120 when the molding dies DI are mutually coupled. . The apparatus of claim 1, wherein the upper pin (120)
And a protrusion (122) protruding from an outer surface of the upper pin body (121) and having a ring shape and formed in a plurality of the holes in the height direction. A method for molding a bellows using the molding apparatus according to claim 1 or 2,
Wherein the upper pin (120) performs preliminary blowing to blow air into the parison (PR), and then the lower pin (130) enters the inside of the parison (PR) to perform the forming blow. A method for molding a bellows using the molding apparatus according to claim 1 or 2,
A first step S110 in which the upper fin 120 is lowered by a certain distance and the lower fin 130 is elevated by a predetermined distance in a state where a pair of the molding dies DI are separated from each other,
A second step S120 in which the parison PR descends to the lower pin 130,
A third step S130 in which the separated forming die D1 is closed,
A fourth step (S140) in which air is introduced into the parison (PR) from the upper fin (120) to preliminarily blow the parison,
A fifth step S150 in which the lower pin 130 is lifted and engaged with the lower surface of the upper pin 120,
A sixth step (S160) of blowing air into the parison (PR) by blowing air from the lower pin (130)
A seventh step S170 of opening the pair of forming dies DI a predetermined distance and then raising the upper fin 130 a predetermined distance,
An eighth step (S180) of opening the pair of forming dies DI and taking out the bellows B,
And a ninth step (S190) of raising the upper fin (120) and lowering the lower fin (130). 5. The method of claim 4,
In the eighth step (S180), the robot grips and takes out the bellows (B) that has been formed. The method according to claim 1,
The bottom surface 120L of the upper fin 120 and the upper surface 130L of the lower fin 130 are in contact with or separated from each other to form parting lines,
A parison PR is filled in a space between the upper fin 120 and the mold DI to form a small diameter portion d of the bellows B,
Wherein a parison PR is filled between an upper surface 130L of the lower pin 130 and the mold DI to form an inner edge E of the small diameter portion d of the bellows B.
KR1020160015258A 2016-02-05 2016-02-05 Apparatus and method for forming bellows KR101736891B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180039434A (en) * 2016-10-10 2018-04-18 주식회사 디엠씨 Apparatus for forming bellows
KR20200125056A (en) * 2019-04-25 2020-11-04 배민준 Blow-molding machine for forming an incision on both necks of a molding product and a mold for said machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101421101B1 (en) 2013-05-22 2014-07-18 김광식 Blow molding machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101421101B1 (en) 2013-05-22 2014-07-18 김광식 Blow molding machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180039434A (en) * 2016-10-10 2018-04-18 주식회사 디엠씨 Apparatus for forming bellows
KR20200125056A (en) * 2019-04-25 2020-11-04 배민준 Blow-molding machine for forming an incision on both necks of a molding product and a mold for said machine
KR102227992B1 (en) * 2019-04-25 2021-03-15 배민준 Blow-molding machine for forming an incision on both necks of a molding product and a mold for said machine

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