KR20190025109A - Ultrasonic Transmitter for Micronization of Lightweight Metal Structure - Google Patents

Abstract

The present invention relates to an ultrasonic transmitter to micronize a lightweight metal structure. According to the present invention, the ultrasonic transmitter to micronize a lightweight metal structure comprises: an ultrasonic generator (10) including an oscillator (11) and a transducer (12) to generate ultrasonic vibration; a booster (20) with a predetermined length to couple a top to the bottom of the transducer (12) to transfer the vibration; a horn (30) with a predetermined length inserted into molten metal while being detachably coupled to the bottom of the booster (20); a chamber (40) receiving the transducer (12) and the booster (20) therein, and fixing the booster (20) therein while allowing the booster (20) to protrude to a lower side through a bottom surface; and a cooling member performing cooling to prevent heat of the molten metal from being transferred to the transducer (12) through the horn (30) and the booster (20). The booster (20) comprises: a contact part (21) formed in a circular shape with a predetermined length and coupled to the transducer (12) by an assembly bolt (21A); a fixing part (22) disposed on the lower part of the contact part (21) and formed in a disk shape with a relatively larger diameter than that of the contact part (21); and a vibration transfer unit (23) disposed on the lower part of the fixing part and formed in a rod shape with a relatively smaller diameter than that of the contact part (21). Accordingly, heat of the molten metal is cooled without being easily transferred to the transducer through the horn and the booster, such that magnetic property of the transducer is prevented from being lost due to high temperature heat and thus a service life of the ultrasonic transmitter is largely increased.

Description

TECHNICAL FIELD [0001] The present invention relates to an ultrasonic transmitter for micronization of a lightweight metal structure,

More particularly, the present invention relates to an ultrasonic wave transmission device for micronizing a lightweight metal structure, and more particularly, to an ultrasonic wave transmission device for microwaving a lightweight metal structure by transferring ultrasonic waves to a molten metal such as aluminum to remove gas remaining in the molten metal, Thereby improving the quality of the ultrasonic wave.

Generally, the molten metal in a mold (hereinafter referred to as "molten metal") is cooled while being in contact with the mold, where the molten metal grows from the surface contacting with the mold to the reverse direction of the heat transfer, .

At this time, if the molten metal in the mold is not uniformly cooled as a whole, the solidified structure forms a nonuniform structure depending on the position.

Therefore, conventionally, a method of transferring ultrasonic waves to a molten metal is used in order to make the structure of the metal finer and form a uniform structure.

As an apparatus for delivering ultrasonic waves to the molten metal as described above, an ultrasonic wave transmitting apparatus in a molten bath of JP-A-1235633 is exemplified. In the ultrasonic wave transmitting apparatus disclosed in this patent document, the ultrasonic wave is inserted into the molten bath, An ultrasonic wave generator for generating ultrasonic waves in the wave guide rod; and a supply part for continuously supplying the molten metal into the molten metal by moving the wave guide rod. The supply part includes a moving roller which is closely attached to the outer circumferential surface of the wave guide rod, And a driving motor for rotating the moving roller at a predetermined rotation speed. The ultrasonic generator includes a moving roller having an empty cylindrical shape inside and spaced apart along the inner circumferential surface of the moving roller A generator disposed in the radial direction for generating ultrasonic waves and transmitting the generated ultrasonic waves to the outer surface of the moving roller, And a structure for applying ultrasonic waves to the waveguide rod through the moving roller, including an ultrasonic wave power supply that is electrically connected to the generator to supply electric power.

When the ultrasonic wave transmission device as described above is used, the gas in the molten metal is removed, bubbles in the solidified structure are removed, and the structure is refined to improve the quality.

However, in the conventional ultrasonic wave transmission device as described above, ultrasonic waves are generated by an electromagnetic method using an oscillator and a transducer (piezoelectric element). When the high-temperature heat of the molten metal is transferred to the transducer through the horn and the booster, There is a problem in that the function of the ultrasonic wave transmission device is lost due to the loss of magnetism as the ducer is heated to a temperature higher than the curie point by the high temperature heat.

Accordingly, development of a structure-improved ultrasonic wave transmission device capable of extending the service life of the ultrasonic wave transmission device by preventing the magnetism of the transducer (piezoelectric element) from being lost by the heat of the molten metal in the ultrasonic wave transmission device for transmitting the ultrasonic wave to the molten metal Is required.

KR 10-1235633 B1 KR 10-1595744 B1 KR 10-2008-0001786 A KR 10-1506553 B1

Accordingly, it is an object of the present invention to solve the problems of the conventional ultrasonic transducer as described above, and it is an object of the present invention to effectively cool the booster and / or the transducer so that the hot heat of the molten metal is not transferred to the transducer through the horn and the booster And to provide an ultrasonic transmission device for micronizing a lightweight metal structure.

According to an aspect of the present invention, there is provided an ultrasonic transmission apparatus including: an ultrasonic generator including an oscillator and a transducer for generating ultrasonic vibration; A booster having a predetermined length coupled to a lower end of the transducer to transmit vibration; A horn having a predetermined length inserted into the molten metal while being detachably connected to the lower end of the booster; A chamber in which a transducer and a booster are housed and a booster is installed to be fixed to the inside while protruding downward through the bottom; A cooling member for cooling the molten metal to prevent heat from being transferred to the transducer through the horn and the booster; Wherein the booster has a cylindrical shape having a predetermined length and is engaged by the transducer and the assembly bolt; A fixing part positioned at a lower part of the contact part and formed in a disk shape having a relatively larger diameter than the contact part; A vibration transmitting portion positioned at a lower portion of the fixing portion and formed in a bar shape having a diameter smaller than that of the contact portion; As shown in Fig.

The present invention is characterized in that the cooling member includes a constant length air cooling guide which is positioned on the bottom surface of the chamber so as to surround the outer peripheral surface of the booster at a predetermined interval and a compressed air supply unit for supplying compressed air into the air cooling guide .

The present invention is further characterized in that the chamber further includes an inlet and an outlet, and the cooling member includes a refrigerant supply unit for supplying the refrigerant to circulate through the inlet and the outlet.

Further, the present invention provides a method of manufacturing a vacuum cleaner, comprising: a lower flange in which a chamber is located inside a lower portion of a chamber, A sealing member interposed between the lower flange and the fixed portion; A fixing member fixed to the lower flange while covering an upper surface of the fixing unit; As a further feature.

In addition, the present invention is characterized in that a cooling groove for cooling the sealing member due to the refrigerant is further formed in the side surface of the lower flange.

) 대비, 진동전달부의 길이가

이상이 되는 것을 또 다른 특징으로 한다.The present invention also relates to a booster having an overall length (

), The length of the vibration transmitting portion

Or more.

Further, the present invention is characterized in that the fixing portion of the booster is formed at an inflection point where the displacement due to vibration becomes zero.

According to the present invention, the booster and / or the transducer is effectively cooled by compressed air or refrigerant so that the high-temperature heat of the molten metal is not transferred to the transducer through the horn and the booster, so that the transducer reaches a Curie point of about 135 캜 And as a result, the life of the ultrasonic transmission device is prolonged.

Further, the present invention has an advantage that the quality of the solidified metal is improved by effectively transferring the ultrasonic wave to the molten metal through the booster and the horn, thereby removing the gas remaining in the molten metal and making the structure finer.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an example of an ultrasonic wave transmission device for micronizing a light metal structure according to the present invention,
2 is a perspective view showing an example of an ultrasonic wave transmission device for micronization of a light metal structure according to the present invention,
FIG. 3 is a perspective view showing a cross section of FIG. 2,
4 is an exploded perspective view showing an example of a transducer and a booster according to the present invention,
5 is a front view showing a transducer and a booster according to the present invention,
6 is a graph showing the inflection points of the displacement of the booster according to the present invention,
7 is a use state diagram showing an example of cooling the booster and the transducer according to the present invention,
FIG. 8 is a state diagram showing an example in which an ultrasonic transmission device for micronizing a lightweight metal structure according to the present invention is used in a mold injected with a melt.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings which illustrate preferred embodiments of the present invention.

An object of the present invention is to provide an ultrasonic transducer for micronizing a lightweight metal structure capable of effectively cooling a booster and / or a transducer so that the high-temperature heat of the molten metal is not transmitted to the transducer through the horn and the booster. The ultrasonic transmission apparatus includes an ultrasonic generator 10, a booster 20, a horn 30, a chamber 40, and a cooling member as shown in Figs.

The ultrasonic generator 10 electromagnetically generates an ultrasonic wave by a magnetostrictive effect and a Lorentz force law and applies the generated ultrasonic waves to a booster 20 and a horn 30 inserted in the melt The structure of the lightweight metal is miniaturized by the ultrasonic generator 10 to form a uniform structure, and the gas in the molten metal is removed, thereby improving the quality of the metal.

The ultrasonic generator 10 includes the oscillator 11 and the transducer 12 as shown in FIG.

Here, the oscillator 11 is a structure for continuously generating high frequency AC electricity within 20 to 28 kHz, and a transducer 12 is a structure for converting the alternating current generated by the oscillator 11 into mechanical vibration to generate vibration .

At this time, when the frequency of the high frequency is low, the strength of the vibration is large, while the metal particles are large. On the contrary, when the frequency is high, the strength of the vibration is weakened.

A booster 20 is coupled to the transducer 12 of the ultrasonic generator 10 and the vibration generated by the ultrasonic generator 10 is transmitted to the horn 30 coupled to the lower end of the ultrasonic generator 10 by the booster 20.

4 and 5, the booster 20 has a cylindrical shape having a predetermined length and includes a contact portion 21 coupled to a bottom surface of the transducer 12 by an assembly bolt 21A, And is positioned at the lower portion of the fixing portion 22 and the fixing portion 22 which are located at the lower portion of the contact portion 21 and are formed in a disc shape having a relatively large diameter as compared with the contact portion 21, And a vibration transmitting portion 23 formed in a small bar shape.

At this time, the fixing portion 22 is formed in a trumpet shape whose diameter is enlarged such that the diameter of the upper end gradually increases as the diameter of the lower end is gradually increased.

An assembly bolt 23A for mounting and dismounting the horn 30 described later is installed on the bottom surface of the vibration transmission portion 23. [

The total length L of the booster 20 is equal to 1 / 2λ, 2 / 2λ and 3 / 2λ ... of 1/2 wavelength which is half the wavelength of the ultrasonic vibration, 22 is formed at an inflection point (a point of 1/4? From the starting point of the booster 20) at which the displacement due to vibration becomes zero. 2/2 ?, 3/2? ... at the point of 1/4? At the starting point of the booster 20 so that the displacement of the vibration becomes the maximum) at the tip of the vibration transmitting portion 23 .

6, the displacement of the vibration generated at the A-inflection point at which the displacement starts to come into contact with the transducer 12 is maximized at the tip end portion of the vibration transmitting portion 23 of the booster 20 C inflection point. At this time, the fixing portion 22 is located at the B inflection point where the displacement due to vibration becomes zero (zero).

With the above arrangement, the vibration transmitted from the transducer 12 is transmitted to the tip of the booster 20 without being reduced by the structures for fixing and supporting the booster 20.

The booster 20 is made of a titanium (Ti) alloy which is light in weight and excellent in heat resistance and corrosion resistance so as not to be easily deformed and damaged (hereinafter referred to as "molten loss") by high temperature heat of the molten metal reaching 650 to 700 ° C. .

The horn 30 is coupled to the lower end of the booster 20 in a long and detachable manner by an assembly bolt 23A and the vibration transmitted from the booster 20 to the horn 20 is amplified and / .

 4 and 5, the horn 30 is formed in a cylindrical or rectangular shape having a predetermined diameter and a length in the up and down direction. On the upper surface, a thread is formed on the inner circumferential surface to be assembled with the booster 20 A formed fastening hole (not shown) is formed.

And is made of a titanium alloy so as not to be easily frayed by high-temperature heat of a molten metal reaching 650 to 700 ° C like the booster 20.

The horn 30 having the above-described structure can be easily replaced even if the horn 30 is assembled by the booster 20 and the assembly bolt 23A in a detachable manner so that the horn 30 is molten by the heat of the molten metal.

The chamber 40 is provided so that the transducer 12 and the booster 20 are accommodated therein so that the transducer 12 and the booster 20 are prevented from being damaged by an external force The refrigerant is supplied to the inside of the chamber 40 by the refrigerant supply unit 70 so that the transducer 12 and the booster 20 are cooled so that the heat generated by the heat transmitted through the horn 30 and the booster 20, The ducer 12 is prevented from being damaged.

1 and 3, the chamber 40 includes a cylindrical housing 41 penetrating vertically and having a receiving space formed on the inside thereof, and a circular plate-like shape covering the open upper portion of the housing 41 And includes a lid 42.

At this time, an upper flange 41A and a lower flange 41B are formed at the upper and lower ends of the housing 41, and the lid 42 is seated on the upper flange 41A and fixed by a plurality of bolts.

An inlet port 41C through which the refrigerant flows and a discharge port 41D through which the refrigerant in the housing 41 is discharged are formed at one side of the housing 41 so as to communicate with the inside of the housing 41, respectively.

The fixed part 44 of the booster 20 is fixed to the lower flange 41B and then a disk-shaped fixing member 44 having a through hole (not shown) formed in the center thereof is assembled with a plurality of bolts. At this time, a sealing member (not shown) is interposed between the upper flange 41A and the lid 42 to prevent the refrigerant in the chamber 40 from leaking to the outside. The lower flange 41B includes an inner vertical wall 41B-1 protruding upward from the bottom of the chamber 40 and a side wall portion 41B-1 extending radially from the outer peripheral edge of the inner vertical wall 41B- And an outer vertical wall 41B-3 that is erected upward from the outer peripheral edge of the side wall portion 41B-2. The refrigerant flows into the outer side surface of the inner vertical wall 41B-1 and the lower surface of the side wall portion 41B-2 so as to be spaced apart from the sealing member 43 so that the sealing member 43 is cooled The cooling groove 41B 'is formed.

The sealing member 43 is interposed between the lower flange 41B and the fixing portion 22 so that the refrigerant in the chamber 40 does not leak into the gap between the lower flange 41B and the fixing portion 22 do.

At this time, if the sealing member 43 is melted by the high-temperature heat, the airtightness is not maintained, and the refrigerant supplied into the chamber 40 falls into the molten metal. In this process, a great accident such as fire or explosion may occur.

Accordingly, the present invention is characterized in that a cooling groove 41B 'is formed along a side surface of the lower flange 41B so as to allow the refrigerant to flow close to the sealing member 43, and the sealing member 43 is heat resistant A sealing member made of a superior material (e.g., Teflon (PTFE) or vital) is used.

As the coolant flows in close proximity to the cooling groove 41B 'and the sealing member 43, the sealing member 43 is more effectively cooled and the sealing member 43 is not easily melted or deformed even at high temperature.

The refrigerant supply unit 70 is provided with a circulation pump (not shown) so that the liquid refrigerant can be circulated and supplied, and the refrigerant is an insulating oil used in a transformer or the like.

7, the refrigerant is introduced into the housing 41 through the inlet 41C and the interior of the housing 41 is filled with the refrigerant. In this state, The refrigerant is circulated through the chamber 40 along the flow path by the circulation pump of the refrigerant supply unit 70 to cool the contact portion 21 of the booster 20 and the transducer 12.

The booster 20 and the transducer 12 are cooled by the circulation of the refrigerant to the inside of the chamber 40 in the above description. However, as another cooling member, an air cooling type cooling member for cooling the booster 20 by air is included .

1 and 3, the air cooling type cooling member is disposed at the bottom of the chamber 40, that is, the bottom surface of the housing 41, (50), and a compressed air supply unit (60) for supplying compressed air to the inside of the air cooling guide (50).

At this time, a flange 51 is formed at an upper end of the air cooling guide 50 and is fixed to the bottom surface of the housing 41 by a plurality of bolts. An air inlet 52 communicating with the inside is formed at an upper portion of the air cooling guide 50, (Not shown). Here, the compressed air supply unit 60 may be a compressor (compressor), a compressed air storage tank, or the like.

The compressed air is rapidly flowed downward along the outer surface of the booster 20 by the air cooling guide 50 as described above to cool the surface of the booster 2 so that the high temperature heat is directed toward the upper side of the booster 20 It is prevented from being transmitted as it is.

8, the horn 30 of the ultrasonic transducer 1 is inserted into the mold 30 to form the inside of the mold 2, The ultrasonic vibration is generated through the ultrasonic wave generator 10 by supplying power to the oscillator 11 in this state.

The vibration generated in the ultrasonic generator 10 is transmitted to the lower horn 30 through the booster 20 coupled to the lower end of the transducer 12 to be transmitted to the molten metal.

The compressed air is supplied to the inside of the air cooling guide 50 through the compressed air supply unit 60 so that the high-temperature heat of the molten metal is not transmitted to the transducer 12 through the horn 30 and the booster 20. Thus, The circulation pump of the refrigerant supply unit 70 is operated to circulate the refrigerant through the chamber 40 so that the contact portion 21 of the booster 20 and the transducer (12).

In the above description, the horn 30 of the ultrasonic transmitter 1 according to the present invention is inserted into the inside of the mold 2. Alternatively, the horn 30 may be inserted into the conduit through which the molten metal flows.

In the above description, the insulating oil is supplied as the refrigerant to the inside of the chamber 40, but water may be supplied as the water-cooled cooling member.

Instead of supplying the refrigerant to the inside of the chamber 40, the booster 20 may be cooled by using only the air cooling type cooling means using the air cooling guide 50.

As described above, the present invention prevents the transducer from reaching a Curie point of about 135 DEG C while being cooled using compressed air and refrigerant so that the high-temperature heat of the molten metal is not transmitted to the transducer through the horn and the booster, The service life of the ultrasonic transmission device is prolonged.

The present invention has the advantage that the ultrasonic wave is effectively transmitted to the molten metal through the booster and the horn, whereby the gas remaining in the molten metal is removed, and the quality of the solidified metal is improved by miniaturizing the structure.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. It is to be understood that the scope of the present invention should not be interpreted as being limited only by the scope of the present invention and that the scope of the present invention should not be construed to be interpreted to limit the scope of the present invention. .

1: ultrasonic transmitter 2: mold
10: ultrasonic generator 11: oscillator
12: Transducer 20: Booster
21: contact portion 21A: assembly bolt
22: fixing part 23: vibration transmitting part
23A: Assembly bolt 30: Horn
40: chamber 41: housing
41A: upper flange 41B: lower flange
41B ': cooling groove 41C: inlet
41D: Outlet 42: Lid
43: sealing member 44: fixing member
50: air cooling guide 51: flange portion
52: air inlet 60: compressed air supply
70: Refrigerant supply section

Claims (6)

An ultrasonic generator (10) including an oscillator (11) and a transducer (12) to generate ultrasonic vibration;
A booster 20 having a predetermined length connected to an upper end of the transducer 12 to transmit vibration;
A horn 30 having a predetermined length inserted into the molten metal while being detachably connected to the lower end of the booster 20;
A chamber 40 in which the transducer 12 and the booster 20 are accommodated and the booster 20 is installed to be fixed to the inside while protruding downward through the bottom surface;
A cooling member for cooling the molten metal to prevent the heat of the molten metal from being transferred to the transducer (12) through the horn (30) and the booster (20); Lt; / RTI >

The booster 20 has a cylindrical portion 21 having a predetermined length and is connected to the transducer 12 by the assembly bolt 21A.
A fixing part (22) located at a lower portion of the contact part (21) and formed in a disc shape having a diameter larger than that of the contact part (21);
A vibration transmitting portion 23 located at a lower portion of the fixing portion 22 and formed in a bar shape having a diameter smaller than that of the contact portion 21; Wherein the ultrasonic wave propagating device comprises:
The method according to claim 1,
The cooling member includes an air cooling guide 50 positioned at a bottom surface of the chamber 40 to surround the outer circumferential surface of the booster 20 at a predetermined interval, And a compressed air supply unit (60) for supplying compressed air to the inside of the ultrasonic transducer.
The method according to claim 1 or 2,
The chamber (40) is further provided with an inlet (41C) and an outlet (41D)
Wherein the cooling member includes a refrigerant supply unit (70) for circulating the refrigerant through the inlet (41C) and the outlet (41D).
The method of claim 3,
The chamber 40 includes a lower flange 41B that is located inside the lower portion of the chamber 40 and on which the fixing portion 22 of the booster 20 is seated; A sealing member 43 interposed between the lower flange 41B and the fixing portion 22; A fixing member 44 which covers the upper surface of the fixing portion 22 and is fixed to the lower flange 41B; Wherein the ultrasonic wave propagating device comprises:
The method of claim 4,
The lower flange 41B
An inner vertical wall 41B-1 protruding upward from the bottom of the chamber 40,
A side wall portion 41B-2 extending horizontally in the radial direction at the outer peripheral edge of the inner vertical wall 41B-1,
An outer vertical wall 41B-3 that is erected upward from the outer peripheral edge of the side wall portion 41B-2,
Lt; / RTI >
The refrigerant flows into the outer side surface of the inner vertical wall 41B-1 and the lower surface of the side wall 41B-2 so as to be close to and away from the sealing member 43 so that the sealing member 43 is cooled And a cooling groove (41B ') is formed on the surface of the ultrasonic transducer.
The method according to claim 1,
The total length L of the booster 20 is a predetermined number (1/2 lambda, 2/2 lambda, 3/2 lambda) of 1/2 wavelength, which is half the wavelength of ultrasonic vibration,
The fixing portion 22 of the booster 20 is formed at a nodal point at which the displacement due to vibration becomes zero at a point of 1/4 of the starting point of the booster 20,
2/2 ?, 3/2? ... at the point of 1/4? At the starting point of the booster 20 so that the displacement of the vibration is maximized) at the tip of the vibration transmitting portion 23 Wherein the ultrasonic wave propagating device is a microwave oven.

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