GB2035179A - Method and device for reinforcing metal item - Google Patents
Method and device for reinforcing metal item Download PDFInfo
- Publication number
- GB2035179A GB2035179A GB7939274A GB7939274A GB2035179A GB 2035179 A GB2035179 A GB 2035179A GB 7939274 A GB7939274 A GB 7939274A GB 7939274 A GB7939274 A GB 7939274A GB 2035179 A GB2035179 A GB 2035179A
- Authority
- GB
- United Kingdom
- Prior art keywords
- item
- reinforcing
- electromagnetic field
- wall
- pulse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P9/00—Treating or finishing surfaces mechanically, with or without calibrating, primarily to resist wear or impact, e.g. smoothing or roughening turbine blades or bearings; Features of such surfaces not otherwise provided for, their treatment being unspecified
- B23P9/04—Treating or finishing by hammering or applying repeated pressure
-
- 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
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Generation Of Surge Voltage And Current (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
A method of reinforcing a metal item (20) by affecting the surface of the item (20) with pressure pulses produced by single pulses from an electromagnetic field, said single pulses being appropriately spaced so as to allow the energy of the next single pulse from said electromagnetic field to be stored. A device for executing the proposed method comprising at least one inductance coil (1) contained within a dielectric enclosure (14), and coupled through a switch (4) controlled by a programming commutator (3), to a pulse generator (5) provided with a discharge energy accumulator (6). Two or more coils 1 may be provided on one or both sides of the work 20. <IMAGE>
Description
SPECIFICATION
Method and device for reinforcing metal item
The present invention relates to metal-working techniques and in particularto a method and device for reinforcing a metal item.
The invention may find application in machinebuilding to increase the strength of various items during a production process.
It is also suitable for reinforcing weld seams and their adjacent zones on items.
The invention resides in that in a method of reinforcing a metal item by affecting its surface with pressure pulses originated underthe action of an electromagnetic field, according to the invention, the pressure pulses are produced by single pulses from the electromagnetic field affecting the item, the single pulses from the electromagnetic field being appropriately spaced so as to allow the energy of the present single pulse from the electromagnetic field to be stored.
Preferably each single pulse from an electromagnetic field lasts for 10-5 to 1 0-2s and the ratio of the spacing between single pulses from an electromagnetic field to the duration of a single pulse from this field is 10to 10,000.
Advantageously the effect of single pulses from an electromagnetic field is coherent at least at two adjacent points on one wall of the item.
Advisably the effect of single pulses from an electromagneticfield is synchronous at opposite points on opposite sides of the item wall.
The invention also resides in that in a device for executing the proposed method of reinforcing a metal item, comprising at least one inductance coil connected to a current source, according to the invention, each inductance coil contained within a dielectric enclosure is located in the immediate vicinity of the item surface and connected to the current source through a switch controlled by a programming commutator and a pulse generator provided with a discharge-type energy accumulator.
The switch controlled by the programming commutator may represent a thyristor whose control electrode is connected to the programming commutator.
It is of advantage to provide a plate fabricated from a highly conductive material between the inductance coil contained within a dielectric enclosure and the item surface.
Desirably each inductance coil contained within a dielectric enclosure is located on one side of the item wall and series-connected with the inductance coil contained within a dielectric enclosure and located at the opposite point on the other side of said item wall, said inductance coils being connected to the pulse generator through the switch controlled by the programming commutaton Preferably at least two inductance coils contained within individual dielectric enclosures are located on one side of an item wall, placed in series with one another and connected to the pulse generator through the switch controlled by the programming commutator.
It is of advantage that at least two inductance coils contained within individual dielectric enclosures are located on one side of an item wall, placed in series with one another and connected in series with the same number of inductance coils contained within individual dielectric enclosures, located at opposite points on the other side of said item wall and seriesconnected with one another, all the inductance coils being connected to the pulse generator through the switch controlled by the programming commutator.
The present invention permits substantially reducing mean power consumption from an external energy source due to energy accumulation in the spacing between pulses from an electromagnetic field.
The energy, N,, of a single pulse from an electromagnetic field is determined from the formula N,=N2. t + T where N2 = energy source power;
71 = device efficiency;
t = duration of a single pulse from an elec
tromagnetic field; and
T = spacing between single pulses from an electromagnetic field, 10 ffi t S 10,000.
If, for example, the duration of a single pulse from an electromagnetic field is 1.10-4s,the spacing between single pulses from an electromagnetic field is 1 s and the device efficiency is 90%, then the mean power consumption from an external energy source will be 9000 times lower than the obtained power of a single pulse from an electromagnetic field.
The invention will now be described in greater detail with reference to a specific embodiment thereof, taken in conjunction with the accompanying drawings, wherein:
Figure 1 is a circuit diagram of a device for executing the proposed method of reinforcing a metal item, which provides independent connection of inductance coils, according to the invention;
Figure 2 shows one embodiment of the device for executing the proposed method of reinforcing a metal item, according to the invention; and
Figure 3 is a circuit diagram of a device for executing the proposed method of reinforcing a metal item, which provides series connection of inductance coils according to the invention.
The hereinproposed method of reinforcing a metal item resides in that the item surface is affected by pressure pulses produced by single pulses from an electromagnetic field affecting said metal item. The single pulses from an electromagnetic field are appropriately spaced so as to allow the energy of the present single pulse from said field to be stored. The accumulation of energy to be spent at a later time on the next single pulse from the electromagnetic field permits substantially reducing power consumption from an external energy source.
A single pulse from the electromagnetic field affecting the item produces a pressure pulse distributed throughout the wall of the processed item, said pressure pulse being used to reinforce said
item.
The pressure on the item surface affected by single pulses from the electromagnetic field is zero.
It increases as the item wall is being penetrated by the field. The pressure is maximum on the opposite side of said item wall.
In thin-walled items the maximum pressure decreases with thickness. In thick-walled items the maximum pressure is not dependent upon the thickness.
In order that pressure distribution throughout an item wall is more uniform, it is affected in a synchronous manner by single pulses from an electromagnetic field on opposite sides of the wall at opposite points.
In this case, the pressure pulses originated under the action of oppositely directed single pulses from the electromagnetic field are added up whereby the pressure throughout the wall becomes essentially equal. Stated differently, the item is reinforced throughout its wall in even manner.
The maximum pressure in an item wall and, thus, the degree of reinforcement depend both on its thickness and on the energy of a single pulse from an electromagnetic field, which, in its turn, is determined by the spacing between single pulses from the electromagnetic field during which it is stored and by the duration of a single pulse from said field during whose duration time it is spent.
Experimental data show that metals items are reinforced most efficiently if a single pulse from an electromagnetic field lasts for 10-5 to 1 O-2S. If the duration of a single pulse from an electromagnetic field exceeds 10-2s, the reinforcement efficiency is sharply reduced. The amplitude of a single pulse from an electromagnetic field drastically increases if its duration is less than 10-5s. Th,,,,,ltant The resultantcom- pressive stresses in the item may exceed the elastic limit of the material from which it is fabricated whereby residual strain will appear. Besides, production and utilization difficulties will be encountered if the duration of a single pulse from an elec tromagneticfield is less than 10-5s.
An optimum ratio of the spacing between single pulses from an electromagnetic field and the duration of a single pulse from said field is within 10-10,000, a feature providing high efficiency in reinforcing metal items and reducing power consumption from an external energy source. The reinforcing time will be too iong if the above ratio exceeds 10,000. If, on the other hand, it is less than 10, the power consumption will be increased since the nominal energy has to be obtained within a short period of time.
To ensure a uniform pressure distribution through
an item wall and to reinforce large metal items,
single pulses from an electromagnetic field may be
applied in a coherent manner at least at two points
on one side of the item wall.
In this case, the energy accumulated during the
spacing is spent simultaneously on several single
pulses from an electromagnetic field, i.e., the energy
of each single pulse from said field is reduced.
However, the effect of several coherent pulses
from such a field, accompanied by the superimposition of pressure pulses within the material, makes the reinforcing process more uniform and expands the area within which the processed item is simultaneously affected by several pulses whereby the reinforcing time will be appreciably reduced.
Preferably the distance between points on the surface of an item wall wherein coherent single pulses from an electromagnetic field are applied is 250 to 600 mm.
Turning nowto Figure 1 the device for executing the proposed method of reinforcing a metal item comprises inductance coils 1 (four coils in the preferred embodiment of the invention) connected to a current source 2 through switches 4 controlled by a programming commutator 3 and a pulse generator 5. The pulse generator 5 includes a discharge-type energy accumulator 6 and a charging unit7 thereof comprising a step-up transformer8 and a rectifier 8.
The switch 4 controlled by the programming commutator 3 may represent a thyristor whose control electrode 10 is connected to the programming commutator3 includes such series-connected components as a voltage-pulse generator 11, a shift register 12, and a voltage-pulse amplifier 13.
Each inductance coil 1 (Fig. 2) is contained within a dielectric enclosure 14 composed of a framework 15 and a casing 16 and is provided with elements 17 supplying current to the inductance coil 1, said elements being used together with nuts 18 as fastening means to secure the dielectric enclosure 14 of the inductance coil 1 to a bracket 19. The bracket 19 is preferably fabricated from a dielectric material.
Energy losses of a single pulse from an electromagnetic field are reduced due to the fact that the inductance coil 1 is contained within the dielectric enclosure 14 and the bracket 19 is fabricated from a dielectric material.
The inductance coil 1 contained within the dielectric enclosure 14 is located in the immediate vicinity of the surface of a metal item 20 to be reinforced, said item being placed on a bearing plate 21. An elastic element 22 precluding residual strain of the item 20 is attacked to the surface of the bearing plate 21 facing the item 20 in any suitable manner (say, by cementing). The bearing plate 21 is provided with a pair comprising a screw 23 and a nut 24, which is used to provide its vertical displacement as a knob 25 secured to the screw 23 is rotated. The lower end of the screw 23 rests against a radial bearing 26 of a base 27. The base 27 is provided with, say, four uprights 28 carrying the bracket 19 and serving as guidesforthe bearing plate 21.
If the metal item 20 is fabricated from a lowconductivity material, a plate 29 may be placed between the item 20 and the inductance coil 1 contained within the dielectric enclosure 14, said plate being fabricated from a material whose conductivity exceeds that of the material from which the item 20 is fabricated. The plate 19 may be fixed in place, say, on the bracket 19. The reinforcing effect increases with the conductivity of the material from which the plate 29 is fabricated. The plate 29 is preferably fabricated from copper or aluminium.
Turning now to Figure 3 which illustrates a circuit diagram of the device for executing the hereinprop
osed method, the four inductance coils 1 are con
nected in series and coupled to the pulse generator 5
through the switch 4 controlled by the programming
commutator 3. In the preferred embodiment of the
invention all the series-connected inductance coils 1
may be located on one side of a wall of the item 20 (Fig. 2), whereby pressure pulses will be uniformly
distributed throughout its surface. In this case, the
coils should be spaced 250 to 600 mm aparts. Also,
one half of the series-connected inductance coils 1
may be located on one side of a wall of the item 20, while the other half of said inductance coils 1 is found at opposite points on the other side of said wall of the item 20.Therefore, pressure distribution throughout the wall of the wall of the item 20 will be uniform and the reinforcing effect will be enhanced.
The device of the invention operates in the following manner.
The pair comprising the screw 23 and the nut 24 is used to move the bearing plate 21 with the elastic element 22 and the metal item 20 to the inductance coil 1 contained within the dielectric enclosure 14 and secured to the bracket 19 so that the surface of the item 20 is in contact with the surface of the dielectric enclosure 14 of the inductance coil 1 or with surface of the plate 29 if the device incorporates such a plate.
Connecting the current source 2 (Figure 1) charges the discharge energy accumulator 6 through the step-up transformer 8 and the rectifier 9. As a signal is applied from the programming commutator 3 to the control electrode 10 of one of the thyristors, the latter is made conductive and the discharge type energy accumulator 6 is discharged into the inductance coil 1 connected to said thyristor. A current pulse passing through the turns of the inductance coil 1 produces around it a high-power electromagnetic field pulse which affects the material of the item 20 (Fig. 2) producing a secondary current pulse and an electromagnetic field pulse therein.
The interaction of the two electromagnetic fields causes the item 20 to be abruptly repelled from the inductance coil 1 whereby a pressure pulse distributed throughout the wall of the item 20 will be produced.
The more conductive the material from which the item 20 is fabricated, the higher is the power of the pulse from the induced electromagnetic field and the stronger is the repulsion of the item 20 from the inductance coil 1. The pressure pulse applied to the item and, thus, the reinforcing effect will be increased.
To increase the reinforcing of the items 20 fabricated from low-conductivity materials, the plate 29 is placed between the item 20 and the inductance coil 1, said plate being fabricated from a highconductivity material such, for example, as copper or aluminium.
In this case, the electromagnetic field pulse originated under the action of the current pulse passed through the turns of the inductance coil 1 produces a secondary current pulse and a electromagnetic field pulse within the plate 29. As a results, a pressure pulse is applied to the item 20 through the plate 29 which is strongly repelled from the inductance coil 1 due to the interaction of the induced electromagnetic fields.
The device operates under pulse conditions.
The discharging of the discharge-type energy accumulator 6 (Fig. 1) into the inductance coil 1 is followed by a time interval during which the discharge-type energy accumulator 6 is charged, i.e., the energy to be spent on the next single pulse from the electromagnetic field is stored.
The duration of a single pulse from the electromagnetic field is determined by the time during which the inductance coil 1 is energized and may be adjusted by varying the discharge time of the energy accumulator 6. The amplitude of a single pulse from the electromagnetic field depends on its duration. An optimum duration of pulses from the electromagnetic field is from 10-5 to 10-2s, the spacing between single pulses from the electromagnetic field being 10 to 10,000 times the duration of a single pulse from said field, which permits reducing mean power consumption in reinforcing items and pre ciudes an unnecessary increase in the reinforcing time. A desired reinforcing effect may be obtained by adjusting the frequency and power of single pulses from the electromagnetic field.
The inductance coils 1 are connected to the pulse generator 5 in the order determined by the programming commutator 3.
The voltage-pulse generator 11 furnishes a continuous sequence of voltage pulses to the ring shift register 12. Thereafter said pulses are amplified by the voltage-pulse amplifier 13.
Before operation a logic 1 is written on bit 1 of the ring shift register 12 and the logic Os are written on all the other bits thereof. The applicatión of a first pulse from the voltage-pulse generator 11 turns on thethyristorwhose control electrode 10 is connected to bit 1 of the shift register 12 and a logic 1 is transferred to bit 2, i.e., the application of a second pulse from the voltage-puise generator 11 turns on the thyristor coupled to bit 2 of the shift register 12 and a logic 1 is transferred to the next bit.
To expand the area within which the processed item is simultaneously affected by several pulses, several inductance coils 1 (Fig. 3) contained within individual dielectric enclosures 14 (Fig. 12) are placed in series and coupled to the pulse generator 5 (Fig. 3) through the switch 4.
The series-connected inductance coils 1 may be located on one side of a wall of the item 20 (Fig. 2). In this case, when the energy accumulator 6 (Fig. 3) is discharged, pressure pulses appear simultaneously at several points on the surface of said wall due to coherent action of single pulses from the electromagnetic field, the number of the points being equal to the number of the series-connected inductance coils 1. Due to interference the pressure pulse field is equalized on the surface of the wall of the item 20 (Fig. 2) and the surface of the item 20 is reinforced in a more uniform manner. Furthermore, the item 20 is reinforced over an appreciably shorter period of time, an advantage associated with the fact that a larger surface of the item 20 is subject to
reinforcement.
In this case, when one half of the series-connected
inductance coils 1 is located on one side of a wall of
the item 20 and the other half of the inductance coils
1 is located on the opposite side of said wall so that
the pairs of the inductance coils 1 face one another,
pressure pulses originated due to the action of single
pulses from the electromagnetic field upon the item
20 (Fig. 2) are oppositely directed and add up as the
energy accumulator 6 (Fig. 3) is discharged. The
pressure inside the wall is essentially equal and the
reinforcing process occurs throughout said wall of
the item 20.
The present invention permits increasing the
degree of reinforcing the item 20 due to the fact that
the pressure created by affecting the item 20 with
single pulses from the electromagnetic field is distri
buted throughout the wall of the item 20. The rein
forcing effect is increased further by affecting the
item 20 with single pulses from the electromagnetic
field in a synchronous manner on both sides of a
wall of the item 20. This precludes plastic deforma
tion of a surface layer and does not increase the sur
face roughness of the item 20.
This invention permits reducing mean power con
sumption from an external energy source due to the
accumulation of energy during the spacing between
single pulses from the electromagnetic field and
enhancing the degree of reinforcing the item without
increasing its surface roughness.
Claims (12)
1. A method of reinforcing a metal item by affect
ing its surface with pressure pulses produced by
single pulses from an electromagnetic field affecting
the item, the single pulses from the electromagnetic
field being appropriately spaced so as to allow the
energy of the next single pulse from the elec
tromagnetic field to be stored.
2. A method of reinforcing a metal item as
claimed in Claim 1, wherein each single pulse lasts
for 10-5 to 10-2s and the ratio of the spacing between
single pulses from the electromagnetic field to the
duration of a single pulse from said electromagnetic
field is lotto 10,000.
3. A method of reinforcing a metal item as
claimed in any of the preceding claims 1 and 2,
wherein at least two points on one wall of the item
are affected in a coherent manner by single pulses
from the electromagnetic field.
4. A method of reinforcing a metal item as
claimed in any of the preceding claims from 1 to 3,
wherein opposite points on opposite sides of an item
wall are affected in a synchronous manner by single
pulses from the electromagnetic field.
5. A device for executing the method of reinforc
ing a metal item according to Claims 1 through 4,
comprising at least one inductance coil contained
within a suitable dielectric enclosure, located in the
immediate vicinity of the item surface and connected
to a current source through a switch controlled by a
programming commutator, and a pulse generator provided with a discharge energy accumulator.
6. A device for executing the herein proposed
method for reinforcing a metal item according to
Claim 5, wherein the switch controlled by the prog
ramming commutator represents a thyristor whose
control electrode is connected to the programming commutator.
7. A device for executing the hereinproposed method of reinforcing a metal item according to any of the claims 5 and 6, wherein a plate fabricated from a high-conductivity material is placed between the inductance coil contained within the dielectric enclosure and the item surface.
8. A device for exciting the above method of reinforcing a metal item according to any of the claims from 5 to 7, wherein each inductance coil contained within the dielectric enclosure is located on one side of an item wall, and connected in series with the inductance coil contained within its dielectric enclosure and located at the opposite point on the other side of said item wall, said inductance coils being connected to the pulse generator through the switch controlled by the programming commutator.
9. A device for executing the above method of reinforcing a metal item according to any of the preceding claims from 5 to 7, wherein at least two inductance coils contained within individual dielectric enclosures are located on one wall of the item, series-connected and coupled to the pulse generator through the switch controlled by the programming commutator.
10. A device for executing the above method of reinforcing a metal item according to Claim 9, wherein at least two inductance coils contained within individual dielectric enclosures are located on one side of an item wall and series-connected with the same number of inductance coils contained within individual dielectric enclosures and located at opposite points on the other side of said item wall, said inductance coils being connected to the pulse generator through the switch controlled by the programming commutator.
11. A method of reinforcing a metal item substantially as hereinabove described with reference to, and as shown in the accompanying drawings.
12. A device for executing the proposed method of reinforcing a metal item substantially as hereinabove described with reference to, and shown in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU2684101 | 1978-11-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2035179A true GB2035179A (en) | 1980-06-18 |
| GB2035179B GB2035179B (en) | 1982-09-02 |
Family
ID=20793387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7939274A Expired GB2035179B (en) | 1978-11-23 | 1979-11-13 | Method and device for reinforcing metalitem |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2947144A1 (en) |
| FR (1) | FR2442103A1 (en) |
| GB (1) | GB2035179B (en) |
| SE (1) | SE451301B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0094912A1 (en) * | 1982-05-17 | 1983-11-23 | Battelle Development Corporation | Improved laser shock processing |
| EP0295263A1 (en) * | 1986-03-03 | 1988-12-21 | Innovex Inc. | Magnetic treatment of ferromagnetic materials |
| EP0922532A1 (en) * | 1997-12-12 | 1999-06-16 | General Electric Company | Balanced electromagnetic peening |
| CN100465304C (en) * | 2007-03-21 | 2009-03-04 | 武汉晶泰科技有限公司 | Application of coupled ultrasonic field and electromagnetic field in increasing service life of metal material |
| CN100465305C (en) * | 2007-03-21 | 2009-03-04 | 武汉晶泰科技有限公司 | Method of raising abrasive resistance of metal material |
| WO2017216587A1 (en) * | 2016-06-13 | 2017-12-21 | Mores Stylianos | Electromagnetic hammer device for the mechanical treatment of materials and method of use thereof |
| CN112410532A (en) * | 2020-10-29 | 2021-02-26 | 武汉晶泰科技股份有限公司 | Electromagnetic pulse processing method for ring-shaped piece |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3442089C1 (en) * | 1984-11-17 | 1985-11-14 | Messerschmitt-Bölkow-Blohm GmbH, 8012 Ottobrunn | Device for generating mechanical surface tensions |
| DE102006022702B3 (en) * | 2006-05-12 | 2007-09-27 | Eads Deutschland Gmbh | Device for cold-working of holes, especially in aircraft construction, uses coil and sleeve arrangement for insertion into holes |
| DE102007031185B4 (en) * | 2007-07-04 | 2015-05-13 | Airbus Defence and Space GmbH | Process for the pretreatment of metallic workpieces for drilling |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1122188B (en) * | 1958-08-28 | 1962-01-18 | Gen Dynamics Corp | Process for deforming conductive, in particular metallic, workpieces in solid form |
| FR1289813A (en) * | 1961-05-10 | 1962-04-06 | Du Pont | Metal hardening process |
| US3360972A (en) * | 1965-05-04 | 1968-01-02 | Nasa Usa | Magnetomotive metal working device |
-
1979
- 1979-11-13 GB GB7939274A patent/GB2035179B/en not_active Expired
- 1979-11-15 SE SE7909447A patent/SE451301B/en not_active IP Right Cessation
- 1979-11-22 DE DE19792947144 patent/DE2947144A1/en not_active Withdrawn
- 1979-11-22 FR FR7928787A patent/FR2442103A1/en active Granted
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0094912A1 (en) * | 1982-05-17 | 1983-11-23 | Battelle Development Corporation | Improved laser shock processing |
| EP0295263A1 (en) * | 1986-03-03 | 1988-12-21 | Innovex Inc. | Magnetic treatment of ferromagnetic materials |
| EP0295263A4 (en) * | 1986-03-03 | 1989-06-13 | Innovex Inc | Magnetic treatment of ferromagnetic materials. |
| EP0922532A1 (en) * | 1997-12-12 | 1999-06-16 | General Electric Company | Balanced electromagnetic peening |
| CN100465304C (en) * | 2007-03-21 | 2009-03-04 | 武汉晶泰科技有限公司 | Application of coupled ultrasonic field and electromagnetic field in increasing service life of metal material |
| CN100465305C (en) * | 2007-03-21 | 2009-03-04 | 武汉晶泰科技有限公司 | Method of raising abrasive resistance of metal material |
| WO2017216587A1 (en) * | 2016-06-13 | 2017-12-21 | Mores Stylianos | Electromagnetic hammer device for the mechanical treatment of materials and method of use thereof |
| CN112410532A (en) * | 2020-10-29 | 2021-02-26 | 武汉晶泰科技股份有限公司 | Electromagnetic pulse processing method for ring-shaped piece |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2442103A1 (en) | 1980-06-20 |
| DE2947144A1 (en) | 1980-06-04 |
| SE7909447L (en) | 1980-05-24 |
| GB2035179B (en) | 1982-09-02 |
| FR2442103B1 (en) | 1983-09-02 |
| SE451301B (en) | 1987-09-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |