KR101593836B1 - Apparatus and method for improving the strength of metallic materials - Google Patents

Apparatus and method for improving the strength of metallic materials Download PDF

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Publication number
KR101593836B1
KR101593836B1 KR1020140151370A KR20140151370A KR101593836B1 KR 101593836 B1 KR101593836 B1 KR 101593836B1 KR 1020140151370 A KR1020140151370 A KR 1020140151370A KR 20140151370 A KR20140151370 A KR 20140151370A KR 101593836 B1 KR101593836 B1 KR 101593836B1
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KR
South Korea
Prior art keywords
strength
metallic material
metal
rotation driving
metallic
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KR1020140151370A
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Korean (ko)
Inventor
이동준
안동현
김형섭
김준원
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포항공과대학교 산학협력단
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
    • C22F3/02—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons by solidifying a melt controlled by supersonic waves or electric or magnetic fields

Abstract

An objective of the present invention is to provide an apparatus and a method for improving strength of a metallic material which can manufacture a metallic material whose strength is improved by applying ultrasonic vibration while compressing and twisting the metallic material. To achieve the objective, the apparatus for improving strength of a metallic material comprises: a pair of material seating units to arrange a metallic material on portions thereof facing each other; an ultrasonic wave generation unit embedded in at least one among the material seating units; a material compression unit to adjust a gap between the material seating units to compress the metallic material; and a rotational drive unit to rotate at least one among the material seating units to rotate the material seating units relative each other. While the metallic material is compressed by the material compression unit and twisted by the rotational drive unit simultaneously, ultrasonic vibration is applied to the metallic material by the ultrasonic wave generation unit to improve the strength of the metallic material.

Description

Technical Field [0001] The present invention relates to an apparatus for increasing the strength of a metal material and a method for increasing the strength of the metal material.

The present invention relates to an apparatus for increasing the strength of a metallic material and a method for increasing the strength of the metallic material. More particularly, the present invention relates to a metallic material for increasing the strength of a metallic material by applying ultrasonic vibration while compressing the metallic material. And to a method for increasing the strength of the device.

As the plastic deformation begins, the formation of the small boundary cell structure begins, and as the amount of plastic deformation increases, the crystal grains gradually become finer as the crystal grain boundaries of the dislocation cell grains increase.

When the crystal grains are changed into ultrafine grained or nanocrystalline grains by applying a large deformation to the material, the mechanical properties (strength, hardness, abrasion resistance, super plasticity, etc.) There is a growing need for a processing method for manufacturing a new ultrafine / nanocrystal material deviating from a material processing method mainly for shape forming.

In order to form such ultrafine / nanocrystalline grains, the amount of plastic deformation applied to the material such as compression, tensile, and shear deformation is important, and the shape of the material before and after the process is substantially It is very important to design the mold in the same way.

Examples of the rigid forming process that satisfies these conditions include Equal Channel Angular Pressing (ECAP), High-Pressure Torsion (HPT), Accumulative Roll Bonding (ARB) , And Equal Channel Angular Rolling (ECAR) have been developed.

For example, in a high pressure torsion (HPT) process, one of the upper and lower dies is rotated in a state of placing a disc-shaped specimen on the upper and lower dies and applying a high pressure to the specimen And the deformation amount '?' Imposed by the high-pressure torsion process is defined by the following Equation 1.

Equation 1:? = R? / (? 3 T)

Where 'r' is the distance from the center of the specimen, 'θ' is the angle of rotation, and 'T' is the thickness of the specimen.

In recent years, however, a metal material of higher strength is required, and development for manufacturing a metal material of higher strength is required.

There is a need to develop a method capable of performing a rigid casting process in accordance with the shape of a conical metal tube by obtaining a metal material having a desired strength even in a high-strength twist process.

WO2013089374 (2013-06-20)

SUMMARY OF THE INVENTION An object of the present invention to solve the above problems is to provide an apparatus for increasing the strength of a metallic material and an apparatus for increasing the strength of the metallic material, which can produce a metallic material with improved strength by applying ultrasonic vibration while compressing the metallic material. Method.

According to an aspect of the present invention, there is provided an apparatus for increasing the strength of a metal material, comprising: a pair of material holding parts configured to arrange a metal material on a part facing each other; An ultrasonic wave generating unit embedded in at least one of the pair of material mouth parts; A material compressing part for adjusting the interval between the pair of material holding parts so that the metal material is compressed; And a rotation driving unit for rotating at least one of the pair of material holding units such that the pair of material placing units are rotated relative to each other, wherein the compression of the metal material by the material compressing unit, And ultrasonic vibration is applied to the metallic material through the ultrasonic wave generator to increase the strength of the metallic material while simultaneously twisting the metallic material by the ultrasonic wave generator.

Preferably, a fixing body having a through-hole passing through one side and the other side and a fixing flange formed on one side; And a head having an insertion protrusion inserted into the through hole at one side thereof and an insertion groove in which the material is placed at the other side and coupled with the fixing body, And may be embedded in the through-hole of the fixed body while being fixed to the projection side.

Preferably, a plurality of coupling holes are formed on the outer circumferential surface of the fixed body, coupling grooves corresponding to the coupling holes are formed in the insertion protrusions of the head, and coupling means penetrating the coupling holes to be coupled to the coupling groove The fixed body and the head may be coupled to each other.

Preferably, the ultrasonic wave generator includes: a vibrator embedded in a through hole of the fixed body; And a power supply line connected to the vibrator through the through-hole.

Preferably, the pair of material confinement portions comprise upper and lower material catches, and the rotation drive portion is provided below the lower material catch to rotate the lower catch, The compression unit may be disposed below the rotation driving unit to move the lower material placing unit up and down.

Preferably, the load cell is fixed to the upper portion of the upper material place portion; An upper panel fixed to an upper portion of the load cell; An intermediate panel having an upper portion provided with the rotation driving portion and a lower portion provided with the material compression portion; And a lower panel to which a lower portion of the material compression section is fixed, wherein the material compression section lifts up the intermediate panel, and at the same time as the rotation drive section rotates the lower material positioning section, And the metal material disposed between the lower material placing portions may be twisted while being compressed.

Preferably, a support bar for connecting the upper panel and the lower panel is provided, and the intermediate panel is configured to pass through the support bar so that the up and down movement can be guided.

Preferably, the space adjusting direction of the material compressing portion and the vibration generating direction of the ultrasonic wave generator coincide with each other.

Preferably, the rotation direction of the rotation driving portion may be configured to be a forward direction or a reverse direction on a plane perpendicular to an interval adjusting direction of the material compressing portion.

Preferably, the metal material may be comprised of a bulk metal, a metal powder, or a mixture thereof.

The method of increasing the strength of a metallic material according to the present invention for solving the above-described problems is configured to increase the strength of the metallic material by applying ultrasonic vibration while compressing and simultaneously twisting the metallic material.

Preferably, the compression direction of the metallic material and the ultrasonic vibration generation direction coincide with each other.

Preferably, the twisting direction of the metallic material may be a direction rotated in a forward direction or a reverse direction on a plane perpendicular to the compression direction of the metallic material.

Preferably, the metal material may be comprised of a bulk metal, a metal powder, or a mixture thereof.

The present invention as described above is advantageous in that a metal material having improved strength can be produced by applying ultrasonic vibration while compressing and simultaneously twisting the metal material.

1 is a schematic view showing an apparatus for increasing the strength of a metal material according to an embodiment of the present invention.
2 is a perspective view showing an upper material holding portion and a lower material holding portion which constitute an apparatus for increasing the strength of a metal material according to an embodiment of the present invention.
3 is an exploded perspective view showing a lower material placing part constituting an apparatus for increasing the strength of a metallic material according to an embodiment of the present invention.
4 is an exploded cross-sectional view showing a lower material placing part constituting an apparatus for increasing the strength of a metal material according to an embodiment of the present invention.
5 to 7 are views for explaining the operation of the apparatus for increasing the strength of a metal material according to an embodiment of the present invention.
8 to 10 are graphs showing the hardness of a metal material produced by an apparatus for increasing the strength of a metal material (high-pressure twisting + ultrasonic vibration) according to an embodiment of the present invention and the hardness of a metal material produced using only a conventional high- .

The present invention may be embodied in many other forms without departing from its spirit or essential characteristics. Accordingly, the embodiments of the present invention are to be considered in all respects as merely illustrative and not restrictive.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms.

The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, components, Steps, operations, elements, components, or combinations of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The method of increasing the strength of the metallic material (A) according to an embodiment of the present invention is a method of increasing the strength of the metallic material (A) as the metallic material (A) is compressed while simultaneously distorting the ultrasonic vibration do.

Here, the direction in which the metallic material (A) is compressed is aligned with the direction in which the ultrasonic vibration is generated, and the twist direction of the metallic material (A) is a plane perpendicular to the compression direction of the metallic material So as to be rotated in the forward direction or the reverse direction.

On the other hand, the metal material (A) may be composed of a bulk metal, a metal powder, or a mixture thereof.

Hereinafter, an apparatus for increasing the strength of a metal material for realizing the above-described method of increasing the strength of the metal material (A) will be described.

1, the apparatus for increasing the strength of a metallic material according to the present embodiment includes a lower material holding portion 110, an upper material holding portion 120, an ultrasonic wave generating portion 130, a material compressing portion 140, And a driving unit 150.

As shown in FIG. 2, the lower material holding portion 110 and the upper material holding portion 120 are configured to face each other, and the metal material A is arranged to face each other.

The lower material holding portion 110 and the upper material holding portion 120 are configured to have the same structure and are disposed so as to be symmetrical with respect to each other. Hereinafter, the lower material holding portion 110 will be described with reference to FIG.

3 and 4, the lower material guide 110 includes a fixed body 111 and a head 113. As shown in FIG.

The fixing body 111 is formed with a through hole 111h passing through one side and the other side and a fixing flange 111a is formed on a lower side of the fixing body 111 to be fixed to the upper portion of the rotation driving part 150. [

The head 113 has an insertion protrusion 113a inserted into the through hole 111h of the fixed body 111 at one side and an insertion groove 113b in which the material is placed on the other side.

More specifically, the insertion protrusion 113a of the head 113 is inserted into the through hole 111h of the fixed body 111, and the fixed body 111 and the head 113 are fixed to each other. Can be coupled to each other by fastening means such as bolts fastened to the coupling groove (h2) of the head (113) through a plurality of coupling holes (h1) formed on the outer peripheral surface of the fixed body (111) .

1 to 4, the ultrasonic generator 130 includes a vibrator 131 built in a through hole 111h of the fixed body 111 and a vibrator 131 that supplies power to the vibrator 131 And a power supply line 133 for power supply.

A through hole 130h is formed in the center of the vibrator 131 and a bolt or the like is inserted into the coupling hole h3 formed in the lower portion of the insertion protrusion 113a of the head 113 through the through hole 130h. The vibrator 131 and the head 113 can be coupled to each other in a fixed state.

3 and 4, the power supply line 133 is configured to be wound around a groove 131a formed on the outer periphery of the vibrator 131. The end of the power supply line 133 is connected to the fixed body 111 Through a through hole 111h of a power supply (not shown) and connected to a power source (not shown).

Accordingly, power is supplied from the power source to the vibrator 131 through the power supply line 133 to generate ultrasonic vibration. At this time, the ultrasonic vibration direction of the vibrator 131 is configured to be the up and down direction.

As the vibrator 131 vibrates in the vertical direction, the head 113 fixedly coupled to the vibrator 131 and the fixed body 111 fixedly coupled to the head 113 are moved The ultrasonic vibration of the vibrator 131 is transmitted, and the entire lower surface of the lower surface of the material holding portion 110 is ultrasonically vibrated.

The ultrasonic wave generating unit 130 may be provided in the lower material holding unit 110 or the upper material holding unit 120 and the lower material holding unit 110 and the upper material holding unit 120, respectively.

As shown in FIG. 1, in order to arrange the lower and upper material grooves 110 and 120 in a vertically symmetrical manner, the upper and lower panels 171, 172 and a lower panel 173.

The upper panel 171 is horizontally fixed to the upper portion of the load cell 160. The upper panel 171 is fixed to the upper portion of the load cell 160. [

Therefore, the degree of compression of the material compression unit can be adjusted based on the pressure value sensed by the load cell 160.

The rotation driving part 150 is provided on the upper part of the middle panel 172 and the material compressing part 140 is provided on the lower part of the middle panel 172.

The lower portion of the material compression portion 140 is fixed to the upper portion of the lower panel 173.

A support bar 174 is fixedly connected to the upper panel 171 and the lower panel 173 and the intermediate panel 172 is configured to be vertically movable through the support bar 174.

The rotation driving part 150 is provided on the upper part of the middle panel 172 and the lower material holding part 110 is provided on the rotation driving part 150.

Therefore, the lower material holding portion 110 can be rotated in the forward direction or the reverse direction by the rotation driving of the rotation driving portion 150.

For example, the rotation driving unit 150 may include a rotating motor, a body portion of the rotating motor is fixed to an upper portion of the middle panel 172, As shown in FIG.

The material compression unit 140 may be provided between the intermediate panel 172 and the lower panel 173 and may include, for example, a driving cylinder. When the driving rod is driven up and down, And to move the panel 172 up and down.

As the middle panel 172 moves up and down, the rotation driving part 150 provided at the upper part of the middle panel 172 moves up and down. As a result, the lower material holding part 110 moves up and down As a result, it is possible to compress the metal material (A) by adjusting the distance between the lower material holding portion 110 and the upper material holding portion 120.

5 to 7 are views for explaining the operation of an apparatus for increasing the strength of a metal material according to an embodiment of the present invention. Hereinafter, the apparatus for increasing the strength of a metal material constructed as described above with reference to Figs. 5 to 7 Will be described.

First, as shown in Fig. 5, the metal material A is placed on the catch groove 113b formed on the upper portion of the lower material holding portion 110. [

6, the material compression unit 140 is driven to move the lower material holding unit 110 upward, so that the metal material A is moved to the lower material holding unit 110 (Not shown) of the upper material holding portion 120 and the lower holding portion 123b of the upper material holding portion 120. [

Next, as shown in FIG. 7, the material compression unit 140 is further driven to move the lower material holding unit 110 upward, so that the metal material A is moved to the lower material holding unit The ultrasonic vibration is generated in the metallic material A by operating the ultrasonic wave generator 130 so that the ultrasonic waves are compressed between the internal grooves 113b of the upper material grooves 110 and the internal grooves 123b of the upper material grooves 120, .

That is, ultrasonic vibration is applied to the metallic material (A) so that the compression direction of the metallic material (A) coincides with the direction of vibration generation of the ultrasonic wave generator (130) The rotation driving unit 150 is driven in the forward or backward direction on the vertical plane with respect to the center of the metal material A so that the metal material A is twisted.

 As described above, the strength of the metallic material (A) can be increased by simultaneously applying the twist and the ultrasonic vibration to the metallic material (A).

It is preferable that the degree of compression of the metal material A is 2 to 500 tons. When the degree of compression of the metal material A is less than 2 tons, the recess 113b of the lower- The metal material (A) can be slipped between the mounting grooves (123b) of the upper material holding portion (120).

On the other hand, it is preferable that the rotation speed for turning the metal material (A) is 0.01 rpm to 10 rpm. If the rotation speed is less than 0.01 rpm, the operation speed is too slow. If the rotation speed is more than 10 rpm, The metal material A can be slipped between the inner groove 113b of the teeth 110 and the inner groove 123b of the upper material inner teeth 120. [

[Example]

Strength of Metal Material Strain was applied to the metal material by fixing a vibrator having a vibration frequency of 200 KHz to the bottom of the lower material of the apparatus.

The oscillator was a 200 KHz oscillator product from KODO CHEMICAL CO., LTD.

The ultrasonic transducer was operated by applying 30 watts of electric power to the attached vibrator. A disk-shaped pure copper specimen with a diameter of 10 mm and a thickness of 1.5 mm was placed in the recess groove of 10 mm in diameter and 0.25 mm in depth , And a load of about 48 tons was applied.

At this time, the pressure applied to the specimen is about 6 GPa by a simple calculation, but the pressure is slightly reduced as the cross-sectional area is enlarged due to deformation of the specimen.

With the 48-ton load applied to the specimen, the lower material placing part of the apparatus for increasing the strength of the metal material was rotated at a speed of 1 rpm.

To measure the change in strength of the material as the deformation was applied, specimens were prepared by dividing the number of revolutions by 1/16, 2/16, 4/16, 8/16, and 1 turn.

Hardness was measured and compared between the case where the oscillator was not operated and the case where the oscillator was operated under the above conditions.

8 to 10 are graphs showing the hardness of a metal material produced by an apparatus for increasing the strength of a metal material (high-pressure twisting + ultrasonic vibration) according to an embodiment of the present invention and the hardness of a metal material produced using only a conventional high- .

As can be seen from the graph, it can be seen that, in the case of vibrating specimens, the hardness value is higher as the number of revolutions increases at r = 0 mm, 0.5 mm, and 1 mm near the center of the specimen.

It can be judged that the dislocation density in the material increases due to the ultrasonic vibration and the strength increases.

Although the present invention has been described with reference to the preferred embodiments thereof with reference to the accompanying drawings, it will be apparent to those skilled in the art that many other obvious modifications can be made therein without departing from the scope of the invention. Accordingly, the scope of the present invention should be interpreted by the appended claims to cover many such variations.

110: Lower material inner surface
111h: through hole
111a: Fixed flange
111: Fixing body
113: Head
113a: Insertion projection
113b, 123b:
120: Upper material inner surface
130: Ultrasonic wave generator
131: Oscillator
133: Power supply line
140: Material compression section
150:
160: Load cell
171: upper panel
172: Middle panel
173: Lower panel
174:

Claims (14)

A pair of material holding portions configured to arrange a metal material at portions facing each other;
An ultrasonic wave generating unit embedded in at least one of the pair of material mouth parts;
A material compressing part for adjusting the interval between the pair of material holding parts so that the metal material is compressed; And
And a rotation driving unit that rotates at least one of the pair of material holding units so that the pair of material placing units rotate relative to each other, wherein a gap adjusting direction of the material compressing unit and a vibration generating direction of the ultrasonic wave generating unit ≪ / RTI >
The ultrasonic vibration is applied to the metallic material through the ultrasonic wave generator while the compression of the metallic material by the material compressing unit and the twisting of the metallic material by the rotation driving unit are performed at the same time, / RTI > The method according to claim 1,
The material confining part comprises:
A fixing body formed with a through hole passing through one side and the other side and having a fixing flange formed on one side thereof; And a head having an insertion protrusion inserted into the through hole at one side thereof and an insertion groove in which the material is placed at the other side thereof and coupled to the fixing body,
Wherein the ultrasonic generator comprises:
Wherein the fixing member is embedded in the through hole of the fixing body while being fixed to the insertion projection side of the head. 3. The method of claim 2,
Wherein a plurality of engaging holes are formed on the outer circumferential surface of the fixed body, and engaging grooves corresponding to the engaging holes are formed in the insertion protrusions of the head, and engaging means engaging with the engaging grooves through the engaging holes, And the body and the head are coupled to each other. 3. The method of claim 2,
Wherein the ultrasonic generator comprises:
A vibrator embedded in the through hole of the fixed body; And a power supply line connected to the vibrator through the through-hole. The method according to claim 1,
Wherein the pair of material compartments is configured to include an upper material catch portion and a lower material catch portion and the rotation driving portion is provided below the lower material catch portion to rotate the lower material catch portion, And a lower portion of the rotation driving portion is provided to raise and lower the lower material placing portion. 6. The method of claim 5,
A load cell fixed to an upper portion of the upper material housing part;
An upper panel fixed to an upper portion of the load cell;
An intermediate panel having an upper portion provided with the rotation driving portion and a lower portion provided with the material compression portion; And
And a lower panel to which a lower portion of the material compression section is fixed,
And the metal material disposed between the upper material holding portion and the lower material holding portion is compressed and twisted as the material pressing portion raises the intermediate panel and the rotation driving portion rotates the lower material holding portion. The strength increasing device of the metal material. The method according to claim 6,
And a support rod connecting the upper panel and the lower panel, wherein the intermediate panel is configured to penetrate through the support rods so as to guide the up and down movement. delete The method according to claim 1,
Wherein the rotation direction of the rotation driving unit is configured to be a forward direction or a reverse direction on a plane perpendicular to an interval adjusting direction of the material compressing unit. The method according to claim 1,
Wherein the metal material is made of a bulk metal, a metal powder, or a mixture thereof. A method of increasing the strength of a metallic material by compressing and simultaneously twisting the metallic material to increase the strength of the metallic material by applying ultrasonic vibration, wherein the direction of compression of the metallic material and the direction of ultrasonic vibration generation coincide. delete 12. The method of claim 11,
Wherein the twist direction of the metal material is a direction rotated in a forward direction or a reverse direction on a plane perpendicular to a compression direction of the metal material. 12. The method of claim 11,
Wherein the metal material comprises a bulk metal, a metal powder, or a mixture thereof.
KR1020140151370A 2014-11-03 2014-11-03 Apparatus and method for improving the strength of metallic materials KR101593836B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009203508A (en) * 2008-02-27 2009-09-10 Aisin Seiki Co Ltd Crystal grain micronizing method and crystal grain micronizing device
WO2013089374A1 (en) 2011-12-16 2013-06-20 포항공과대학교 산학협력단 Torsional extreme-plastic processing method of conic metal pipe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009203508A (en) * 2008-02-27 2009-09-10 Aisin Seiki Co Ltd Crystal grain micronizing method and crystal grain micronizing device
WO2013089374A1 (en) 2011-12-16 2013-06-20 포항공과대학교 산학협력단 Torsional extreme-plastic processing method of conic metal pipe

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