EP0094759A2 - Apparatus for and method of metalizing metal bodies - Google Patents
Apparatus for and method of metalizing metal bodies Download PDFInfo
- Publication number
- EP0094759A2 EP0094759A2 EP83302487A EP83302487A EP0094759A2 EP 0094759 A2 EP0094759 A2 EP 0094759A2 EP 83302487 A EP83302487 A EP 83302487A EP 83302487 A EP83302487 A EP 83302487A EP 0094759 A2 EP0094759 A2 EP 0094759A2
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- EP
- European Patent Office
- Prior art keywords
- metalizing
- chamber
- powder
- heated
- heat
- 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.)
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 11
- 239000002184 metal Substances 0.000 title claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 58
- 238000010438 heat treatment Methods 0.000 claims abstract description 41
- 239000007789 gas Substances 0.000 claims abstract description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 15
- 230000006698 induction Effects 0.000 claims abstract description 15
- 230000001590 oxidative effect Effects 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 238000010791 quenching Methods 0.000 claims abstract description 5
- 230000000171 quenching effect Effects 0.000 claims abstract 3
- 239000012530 fluid Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 239000010419 fine particle Substances 0.000 claims description 2
- 230000001464 adherent effect Effects 0.000 claims 2
- 238000003287 bathing Methods 0.000 claims 2
- 239000000203 mixture Substances 0.000 claims 2
- 239000007788 liquid Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 19
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 9
- 239000010410 layer Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000012255 powdered metal Substances 0.000 description 1
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- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
- C23C24/106—Coating with metal alloys or metal elements only
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
Definitions
- This invention relates to the metalizing of metal bodies, such as bars and rods and tubes, so as to produce articles, such as chrome plated steel bars and rods, for such ultimate uses as shafts or pins, and chrome plated tubes.
- chromium is a relatively expensive material, and chromium's use in various chemical baths means, by which chrome plating may be effected, is environmentally undesirable and/or difficult and expensive to control.
- the problems with said prior technique are that there is both lack of accurate control of the thickness of the layer of the surface application material to the underlying body, and resultant lack of uniformity of the thickness of the layer that is applied by the torch heat. Furthermore, the minimum thickness of the layer of applied material usually obtained by metalizing with an open flame torch, working with powdered metal, is about .008 inches, and maximum thickness of layer of applied metal is about .015 inches, both of which thickness values are frequently much greater than the thickness of the applied material layer required to be supplied to meet the performance specifications for the metalized part, and this substantially increases the cost of manufacture.
- a further problem is that when using fine particles of metalizing materials to form a fused surface on an underlying body, the torch heat intensity is frequently so great that it vaporizes, or burns away, a substantial quantity of the finest particles of the metalizing material, resulting in loss of material and economic waste.
- One object of this invention is to provide an improved method for surface metalizing metal bars, rods and tubes in a manner to accurately control the thickness of metalizing surface applied to the underlying body.
- Another object of this invention is to provide an improved apparatus for, and method of, surface metalizing bodies with a metalizing powder in a manner that substantially reduces the burn-up loss of the metalizing material.
- a further object of this invention is to provide an apparatus and method for surface metalizing of bodies with chrome powder in a manner to provide an accurate control of the thickness of the metalizing layer applied, while simultaneously avoiding economic loss of metalizing powder through vaporization or burning.
- a first induction coil is used to provide, as part of a first step, the heating of an axially moving body, such as a bar or rod or tube, to a selected pre-heat temperature; rotating the body while a powdered metalizing material is flooded. onto, or over, the pre-heated body to adheringly deposit a layer of metalizing material onto the body; and then fusing the powdered metalizing material to the body by induction heating the body with metalizing material adhering thereto, at a fusing temperature and in the presence of an inert gas, while recapturing, for later re-use, the non-deposited metalizing powder.
- an axially moving body such as a bar or rod or tube
- Figure 1 is a vertical, cross-sectional, view of one form of apparatus for practicing the process of this invention, and illustrating diagrammatically a preferred combination of means and apparatus, for effecting the practice of the process of this invention upon an elongated cylindrical body.
- an elongated cylindrical bar 10 of steel, or the like, that is to be metalized is illustrated as being endless, the bar 10 usually will be of some finite length that is greater than the length of the treating apparatus illustrated.
- the bar is to be advanced through the heating apparatus by means that moves the bar 10 axially, or longitudinally, while simultaneously rotating the bar 10.
- Such an apparatus is well known in the art of movement of elongated bodies.
- such an apparatus would include sets of opposed roller discs located both upstream (ahead of) and downstream (after) a station at which the bar is to be acted upon, with the sets of rollers constructed and arranged to at least support the bar at the elevation shown, relative to the region at which the bar is to be acted upon.
- the two sets of roller discs would be arranged in an overlapping fashion so as to define a support region above the region of overlap, which would serve as a crotch to cradle the cylindrical body, and the discs would also be arranged so that their rotation would operate to move the cylindrical body axially while the cylindrical body also would be rotated about its longitudinal axis.
- FIG. 1 illustrates, diagrammatically, a type of motion imparting means in the form of a set of inclined drive rollers 12 and 14, which are angled oppositely as shown, and each driven from a source of rotation, such as a power train, or by drive motors 13 and 15, to cause the rollers to purchase, or grip, the bar to cause it to move axially, or longitudinally in the direction of arrow 16, while simultaneously rotating the bar in the direction of arrow 18.
- a source of rotation such as a power train
- drive motors 13 and 15 to cause the rollers to purchase, or grip, the bar to cause it to move axially, or longitudinally in the direction of arrow 16, while simultaneously rotating the bar in the direction of arrow 18.
- the metal bar 10 is shown moving from left to right through an enclosure, or chamber means, generally 20, which defines, and substantially encloses, an isolated treating chamber 22.
- the chamber-defining means 20 includes a pair of spaced end walls, respectively entry wall 24 and exit wall 26, a top wall 28, a bottom wall 30 with oppositely sloping sections 30a and 30b, which pitch toward a central junction, and back and front walls, not seen in Fig. 1.
- the back wall is spaced behind the drawing sheet and the front wall is spaced forwardly of the drawing sheet, as is understood in such illustrative drawings.
- the entry wall 24 has a first, or entry, opening 25 therein.
- the exit wall 26 has a second, or exit, opening 27 therein.
- the leading end of the bar 10 moving from left to right enters the substantially enclosed treating chamber 32, that, is bounded by walls 24, 26, 28, and 30 and the back and front walls, through entry opening 25 and exits from chamber 32 through exit opening 27.
- first heating means in the form of a first electrical induction helical heating coil located adjacent the entry opening 25 and surrounding a portion of metal bar 10.
- the heating coil means 34 is of any type well known in the art for effecting induction heating in a metal body, such as a bar 10.
- a second electrical induction, helical, heating coil means 36 is spaced from heating coil means 34, and is located adjacent the exit opening 27, and it surrounds the bar 10 at a point along that bar's travel that is before the bar leaves the treating chamber.
- a typical counstruction for the first heating coil means 34, for use with a bar 10 of one inch (1") diameter is a 4-turn coil with an internal diameter (I.D.) of 1 and 3/16 inches, designed to provide a pre-heating, of the bar portion surrounded by coil means 34, to an initial temperature of about 900 degrees F.
- the second heating coil means 36 is designed to provide an induction heating of the bar portion of one inch (1") diameter surrounded by coil means 36 to a chrome-fusing temperature of approximately 1800 degrees or more, as required, using a 6-turn coil with a 1 and 1/4 inch I.D.
- the power consumed by heating coil means 36 is about 100 kilowatts at a frequency of 10 Khz.
- the temperature 'developed by an induction heater is a function of the number of turns of the coil heater and its closeness to the body being heated.
- the coils 34 and 36 are axially spaced and aligned relative to the bar 10 and its direction of movement, so that a pre-heated portion 10a of bar 10 passes through the surrounded core region of coil 36.
- the pre-heated portion 10a of bar 10 is shown positioned between coils 34 and 36, in the course of its longitudinal movement.
- the bar portion 10a is subject to an additional step of the process herein in the said region located between coils 34 and 36.
- the region in which the exposed, pre-heated, bar portion 10a is located between coils 34 and 36 is positioned directly in the path of an upright, projected, flow passageway that is located within chamber 32, and which extends, in effect, between a discharge nozzle, or spout, 40 and a sump, or return, pipe 42. More specifically, there is provided upon the top wall 28 of chamber defining means 20, a reservoir, or supply tube, 44 from which flows a supply of a metalizing powder, P. The lower end of a reservoir 44 feeds into the upstream end of nozzle 40 whose interior is shaped, as shown, to form a tapered metering funnel 45 which terminates at its lower end in a constructed discharge opening 46.
- the intake end of reservoir 44 is provided with a constant supply (not shown) of metalizing powder that feeds downwardly from reservoir 44 by gravity, aided by movement of a supply of gas under pressure toward discharge opening 46.
- An upstream portion of reservoir tube 44 is provided with a laterally extending connection tube 48 through which is supplied pressurized gas from a source (not shown). Pressurizing gas may also be supplied through reservoir 44 from its inlet end.
- the gas used for aiding flow of the metalizing powder from funnel discharge opening 46 downwardly across the bar portion 10a is a non-oxidizing gas, such as nitrogen, or a rare gas selected from the group that includes neon and argon.
- the gas is nitrogen under 5 p.s.i. pressure in excess of atmospheric pressure, and pre-heated to a temperature of at least 900 degrees F.
- the entire interior of treating chamber 32 is also supplied by nitrogen at elevated temperature of at least 900 degrees E., supplied through an inlet tube 49 through the top chamber wall 28.
- the metalizing powder 46, and the impelling and entraining nitrogen gas that discharges through opening 46 then flows, as a stream of fluid which entrains metalizing powder 46 and which washes over, or bathes, the pre-heated bar portion 10a with metalizing powder.
- the heat of the pre-heated bar portion 10a operates to cause the metalizing powder 46 in the stream of fluid to adhere, or cling, to the pre-heated surface of the bar, and since the bar 10 is being continuously rotated, a continuous coating of clinging powder is provided on bar portion 10a.
- the sump, or return, pipe 42 is positioned on the intake side of a diaphragm-type pump (not shown), as is available for use in a flowing gas-particle recovery system.
- the axially moving bar 10 operates to move bar portion 10a into and through the open core of heating coil 36, where an increased induced temperature, in excess of approximately 1800 degrees F., effected in bar portion 10a operates to fuse the clinging powder 46 to the bar ' position 10a to form a continuous metalized surface on bar 10.
- the fused, metalized, bar portion is designated at 10b.
- alloys sold by Colmbnoy Corporation of Detroit, Michigan have been employed in metalizing bars and tubes.
- Colmonoy Alloy Nos. 62 and 63 having a Rockwell Hardness (C Scale) of 58-63 and a specific gravity of 7.8, have a melting point of 1875 degrees F.
- Other alloy numbers have greater specific gravity values and higher melting point temperatures to a maximum of about 2250 degrees F.
- metalized bar portion 10b with fused surface exits the chamber 32 through exit opening 27, said metalized bar portion is caused to pass through a water quench station 50 in the form of a ring, or annulus, from which one or more streams of cooling water are projected inwardly and directed against the metalized surface of metalized bar portion 10b.
- the use of this invention has the capability of providing a metalized surface of a thickness between .002 - .015 inches. It will be observed that the minimum thickness of the metalized surface, or layer, provided by practice of this invention is as small as about 1/4 of the minimum thickness that could be achieved through use of the prior art, torch, technique discussed above, and this leads to a substantial economy in use * of metalizing powder, the cost of which is presently about $6. - $8. per pound.
- the metalized bar portion After the metalized bar portion has been quenched and cooled, the metalized bar may be cut into axial lengths as desired to provide bar segments for further finishing operations by subsequent machining or other operations.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating Apparatus (AREA)
- General Induction Heating (AREA)
Abstract
An apparatus and method for metalizing the surface of metal bodies, such as bars, rods and tubes is providing using a substantially enclosed chamber in which the metalizing is caused to occur. An elongated body to be metalized is moved axially into the chamber through an entrance opening while the body is simultaneously rotated, and then passes through a first induction heating coil to pre-heat a portion of the body surface to a selected pre-heat temperature. The pre-heated portion is then advanced past the pre-heating coil to a point where it is subjected to, and bathed by, a flowing stream of metalizing powder entrained within a heated non-oxidizing gas, such as nitrogen, with the flowing stream directed against the pre-heated body portion so that the entrained metalizing powder impinges against and clings to and covers the entire surface of the pre-heated portion. The pre-heated body portion with metalizing powder clinging thereto then moves through a second induction heating coil which heats the body and metalizing powder to a fusing temperature greater than the pre-heat temperature, so as to fuse the metalizing powder to the body. The interior of the chamber is filled with the non-oxidizing gas to prevent entry of air. The moving body with fused metalized surface thereon then exits from the chamber and is arranged to pass through a water quenching station which quenches and cools the metalized body.
Description
- This invention relates to the metalizing of metal bodies, such as bars and rods and tubes, so as to produce articles, such as chrome plated steel bars and rods, for such ultimate uses as shafts or pins, and chrome plated tubes.
- There are many fields of manufacture in which metalizing is used to provide bodies, such as bars and rods and tubes of ordinary steel, with an expensive surface layer, treatment, or coating that is fused to the metal, to provide a part that will respond to manufacturing specifications but is less expensive than making the entire body of the same material that the specifications require be only at the surface of the body. Thus, parts such as force transmitting rods, piston rods, shock absorber shafts, bearing shafts, pivot pins, tubes, and the like, are frequently required to provide thereon an exterior surface of chromium, or chrome.
- It has been long known that ordinary steels, except for leaded steels or resulphurized steels, provided in bar or pin form, may be chrome surfaced, by plating or the like, to both meet the specifications for desired strength of the part and with the surface character being specially adapted for the environment in which the part is to be used.
- However, chromium is a relatively expensive material, and chromium's use in various chemical baths means, by which chrome plating may be effected, is environmentally undesirable and/or difficult and expensive to control.
- While metalizing the surface of bars and rods avoids, to substantial extent, the undesirable environmental effects of chemical plating such bodies, the mechanical metalizing techniques presently employed have usually used an open flame torch that burns fuel gases, such as acetylene, propane, or the like in the presence of oxygen, to both preheat the body surface to an elevated temperature and to heat the surface application material, which is initially in powder form, to a temperature at which the molten powder material will fuse with the material of the body. These prior art metalizing techniques have not been wholly successful in metalizing tubes, as the heat of a torch will frequently burn through the wall of-the tube.
- The problems with said prior technique are that there is both lack of accurate control of the thickness of the layer of the surface application material to the underlying body, and resultant lack of uniformity of the thickness of the layer that is applied by the torch heat. Furthermore, the minimum thickness of the layer of applied material usually obtained by metalizing with an open flame torch, working with powdered metal, is about .008 inches, and maximum thickness of layer of applied metal is about .015 inches, both of which thickness values are frequently much greater than the thickness of the applied material layer required to be supplied to meet the performance specifications for the metalized part, and this substantially increases the cost of manufacture. A further problem is that when using fine particles of metalizing materials to form a fused surface on an underlying body, the torch heat intensity is frequently so great that it vaporizes, or burns away, a substantial quantity of the finest particles of the metalizing material, resulting in loss of material and economic waste.
- One object of this invention is to provide an improved method for surface metalizing metal bars, rods and tubes in a manner to accurately control the thickness of metalizing surface applied to the underlying body.
- Another object of this invention is to provide an improved apparatus for, and method of, surface metalizing bodies with a metalizing powder in a manner that substantially reduces the burn-up loss of the metalizing material.
- A further object of this invention is to provide an apparatus and method for surface metalizing of bodies with chrome powder in a manner to provide an accurate control of the thickness of the metalizing layer applied, while simultaneously avoiding economic loss of metalizing powder through vaporization or burning.
- Further objects and advantages will become known to one skilled in the art, as these specifications proceed to describe the invention disclosed herein.
- In the instant invention, a first induction coil is used to provide, as part of a first step, the heating of an axially moving body, such as a bar or rod or tube, to a selected pre-heat temperature; rotating the body while a powdered metalizing material is flooded. onto, or over, the pre-heated body to adheringly deposit a layer of metalizing material onto the body; and then fusing the powdered metalizing material to the body by induction heating the body with metalizing material adhering thereto, at a fusing temperature and in the presence of an inert gas, while recapturing, for later re-use, the non-deposited metalizing powder.
- Figure 1 is a vertical, cross-sectional, view of one form of apparatus for practicing the process of this invention, and illustrating diagrammatically a preferred combination of means and apparatus, for effecting the practice of the process of this invention upon an elongated cylindrical body.
- Referring now to the drawing, there is shown, in the vertical, cross-sectional, view of the apparatus for practice of the invention an elongated
cylindrical bar 10 of steel, or the like, that is to be metalized. Although thebar 10 is illustrated as being endless, thebar 10 usually will be of some finite length that is greater than the length of the treating apparatus illustrated. The bar is to be advanced through the heating apparatus by means that moves thebar 10 axially, or longitudinally, while simultaneously rotating thebar 10. Such an apparatus, is well known in the art of movement of elongated bodies. Typically, such an apparatus (not shown) would include sets of opposed roller discs located both upstream (ahead of) and downstream (after) a station at which the bar is to be acted upon, with the sets of rollers constructed and arranged to at least support the bar at the elevation shown, relative to the region at which the bar is to be acted upon. - In such prior constructions, the two sets of roller discs would be arranged in an overlapping fashion so as to define a support region above the region of overlap, which would serve as a crotch to cradle the cylindrical body, and the discs would also be arranged so that their rotation would operate to move the cylindrical body axially while the cylindrical body also would be rotated about its longitudinal axis. The drawing, Fig. 1, illustrates, diagrammatically, a type of motion imparting means in the form of a set of
inclined drive rollers 12 and 14, which are angled oppositely as shown, and each driven from a source of rotation, such as a power train, or by drivemotors arrow 16, while simultaneously rotating the bar in the direction ofarrow 18. - The
metal bar 10 is shown moving from left to right through an enclosure, or chamber means, generally 20, which defines, and substantially encloses, an isolated treating chamber 22. The chamber-defining means 20 includes a pair of spaced end walls, respectivelyentry wall 24 andexit wall 26, atop wall 28, abottom wall 30 with oppositely slopingsections 30a and 30b, which pitch toward a central junction, and back and front walls, not seen in Fig. 1. The back wall is spaced behind the drawing sheet and the front wall is spaced forwardly of the drawing sheet, as is understood in such illustrative drawings. Theentry wall 24 has a first, or entry, opening 25 therein. Theexit wall 26 has a second, or exit, opening 27 therein. The leading end of thebar 10, moving from left to right, enters the substantially enclosed treatingchamber 32, that, is bounded bywalls chamber 32 through exit opening 27. - Mounted within the treating
chamber 32 is a first heating means, 34, in the form of a first electrical induction helical heating coil located adjacent the entry opening 25 and surrounding a portion ofmetal bar 10. The heating coil means 34 is of any type well known in the art for effecting induction heating in a metal body, such as abar 10. A second electrical induction, helical, heating coil means 36 is spaced from heating coil means 34, and is located adjacent the exit opening 27, and it surrounds thebar 10 at a point along that bar's travel that is before the bar leaves the treating chamber. - A typical counstruction for the first heating coil means 34, for use with a
bar 10 of one inch (1") diameter is a 4-turn coil with an internal diameter (I.D.) of 1 and 3/16 inches, designed to provide a pre-heating, of the bar portion surrounded by coil means 34, to an initial temperature of about 900 degrees F. The second heating coil means 36 is designed to provide an induction heating of the bar portion of one inch (1") diameter surrounded by coil means 36 to a chrome-fusing temperature of approximately 1800 degrees or more, as required, using a 6-turn coil with a 1 and 1/4 inch I.D. The power consumed by heating coil means 36 is about 100 kilowatts at a frequency of 10 Khz. The temperature 'developed by an induction heater is a function of the number of turns of the coil heater and its closeness to the body being heated. - The
coils bar 10 and its direction of movement, so that a pre-heated portion 10a ofbar 10 passes through the surrounded core region ofcoil 36. The pre-heated portion 10a ofbar 10 is shown positioned betweencoils coils - The region in which the exposed, pre-heated, bar portion 10a is located between
coils chamber 32, and which extends, in effect, between a discharge nozzle, or spout, 40 and a sump, or return,pipe 42. More specifically, there is provided upon thetop wall 28 of chamber defining means 20, a reservoir, or supply tube, 44 from which flows a supply of a metalizing powder, P. The lower end of areservoir 44 feeds into the upstream end of nozzle 40 whose interior is shaped, as shown, to form atapered metering funnel 45 which terminates at its lower end in a constructeddischarge opening 46. The intake end ofreservoir 44 is provided with a constant supply (not shown) of metalizing powder that feeds downwardly fromreservoir 44 by gravity, aided by movement of a supply of gas under pressure towarddischarge opening 46. - An upstream portion of
reservoir tube 44 is provided with a laterally extendingconnection tube 48 through which is supplied pressurized gas from a source (not shown). Pressurizing gas may also be supplied throughreservoir 44 from its inlet end. The gas used for aiding flow of the metalizing powder from funnel discharge opening 46 downwardly across the bar portion 10a, is a non-oxidizing gas, such as nitrogen, or a rare gas selected from the group that includes neon and argon. Preferably, the gas is nitrogen under 5 p.s.i. pressure in excess of atmospheric pressure, and pre-heated to a temperature of at least 900 degrees F. The entire interior of treatingchamber 32 is also supplied by nitrogen at elevated temperature of at least 900 degrees E., supplied through aninlet tube 49 through thetop chamber wall 28. - The metalizing
powder 46, and the impelling and entraining nitrogen gas that discharges throughopening 46 then flows, as a stream of fluid which entrains metalizingpowder 46 and which washes over, or bathes, the pre-heated bar portion 10a with metalizing powder. The heat of the pre-heated bar portion 10a operates to cause the metalizingpowder 46 in the stream of fluid to adhere, or cling, to the pre-heated surface of the bar, and since thebar 10 is being continuously rotated, a continuous coating of clinging powder is provided on bar portion 10a. - The washing stream of nitrogen and metalizing powder which passes over
bar 10 and moves downwardly below bar portion 10a, is recaptured by a sump, orreturn pipe 42, which conveys the recaptured stream to a recapture apparatus for either recycling both the gas and powder to and throughinlet tube 48 orreservoir 44, or recapturing the stream through some other alternate recovery of the powder and gas, together or separately, as desired. The sump, or return,pipe 42 is positioned on the intake side of a diaphragm-type pump (not shown), as is available for use in a flowing gas-particle recovery system. - As the bar portion 10a is being coated with the metalizing
powder 46 which clings to said bar portion, the axially movingbar 10 operates to move bar portion 10a into and through the open core ofheating coil 36, where an increased induced temperature, in excess of approximately 1800 degrees F., effected in bar portion 10a operates to fuse the clingingpowder 46 to the bar 'position 10a to form a continuous metalized surface onbar 10. The fused, metalized, bar portion is designated at 10b. - As an example of metalizing material used, alloys sold by Colmbnoy Corporation of Detroit, Michigan have been employed in metalizing bars and tubes. Specifically, Colmonoy Alloy Nos. 62 and 63 having a Rockwell Hardness (C Scale) of 58-63 and a specific gravity of 7.8, have a melting point of 1875 degrees F. Other alloy numbers have greater specific gravity values and higher melting point temperatures to a maximum of about 2250 degrees F.
- After the metalized bar portion 10b with fused surface exits the
chamber 32 through exit opening 27, said metalized bar portion is caused to pass through awater quench station 50 in the form of a ring, or annulus, from which one or more streams of cooling water are projected inwardly and directed against the metalized surface of metalized bar portion 10b. - The use of this invention has the capability of providing a metalized surface of a thickness between .002 - .015 inches. It will be observed that the minimum thickness of the metalized surface, or layer, provided by practice of this invention is as small as about 1/4 of the minimum thickness that could be achieved through use of the prior art, torch, technique discussed above, and this leads to a substantial economy in use *of metalizing powder, the cost of which is presently about $6. - $8. per pound. Furthermore, when using the torch technique only about a maximum of 70% of the metalizing material would be deposited on the surface of the articles being metalized, while with the practice of the invention disclosed herein, at least 90% of the metalizing material is deposited on the surface of the articles, providing a 90% efficiency factor for usage of 'the metalizing powder.
- After the metalized bar portion has been quenched and cooled, the metalized bar may be cut into axial lengths as desired to provide bar segments for further finishing operations by subsequent machining or other operations.
- While the interior of the heating chamber 22 is pressurized by gas under pressure, and the size of entry opening 25 and
exit opening 27 could permit escape of some gas and entrained metalizing powder therethrough, it will be recognized that means such as gaskets and recovery systems, could be employed to seal against, or limit, loss of fluid and entrained metalizing powder through such openings. However, it is believed that the losses will be, or could be made, so insubstantial as to not demand use of expensive loss prevention measures and costs associated therewith. - While I have disclosed herein an apparatus and method for metalizing certain regular metal bodies, persons skilled in that art will appreciate that the invention herein may be used for metalizing of other or irregular bodies, and it is intended to cover all aspects of my invention herein, as limited solely in the claims appended hereto.
Claims (14)
1. An apparatus for metalizing an elongated body comprising, in combination:
a substantially enclosed treating chamber;
a first opening in said chamber through which one end of an elongated body is adapted to enter moving axially of the body, a second opening in said chamber through which the said one end of the elongated body and the body is adapted to leave the chamber, moving axially;
means for moving said elongated body axially through said first opening into the chamber, then through the chamber, and then from said chamber outwardly through said second opening;
a first heating means in the chamber for locally heating the body to a first elevated temperature;
a second heating means in the chamber spaced for said first heating means and for locally heating the body to a second elevated temperature greater in degree of heat than said first elevated temperature;
metalizing powder supply means arranged to discharge therefrom, and into said treating chamber, a metalizing powder stream that washes over the entire _ surface of the portion of the body that has been heated to said first elevated temperature, leaving on said heated body portion an adherent layer of metalizing powder before the body is subjected to said second elevated temperature; and
the temperature of the second elevated temperature being selected to be that at which the adherent metalizing powder layer fuses to the body.
and means outside the chamber for quenching the heat of the metalized body as it leaves the metalizing chamber.
2. An apparatus for metalizing an elongated body comprising in combination:
means defining an enclosing metalizing chamber having a first opening through which the elongated body is to enter the chamber, and a second opening through which the metalized elongated body is to exit from the chamber;
means operatively associated with the elongated body for axially advancing the elongated body relative to said chamber while simultaneously rotating it about its longitudinal axis;
means within said chamber for locally heating a portion of the elongated body, after it enters the chamber, to a first selected pre-heat temperature as -the body advances through the chamber;
means providing, within the chamber, a washing stream, composed of a mixture of finely dispersed metalizing powder and a pressurized non-oxidizing gas, that is directed to flow over the axially advancing and rotating pre-heated body portion, whereby a portion of the metalizing powder in said washing stream is caused to cling to and coat, to a substantially uniform thickness, said pre- heated body portion;
and means within said chamber for locally heating said coated body portion to fuse the coating of metalizing powder to the body portion, at a fusing temperature which is greater in degree of heat than said pre-heat temperature, before said coated body portion exits from the chamber.
3. An apparatus as in Claim 2 wherein the washing stream of metalizing powder and non-oxidizing gas is a mixture of metalizing powder and nitrogen that is heated to a temperature of at least approximately the same degree of heat as the pre-heated body portion.
4. An apparatus as in Claim 2 wherein the chamber includes spaced inlet and outlet stream means, for effecting and directing movement of the washing stream of fine particles of a metalizing powder and gas, over a flowpath transverse to the direction of axial movement of the elongated body, and along a transverse path that is located axially of the elongated body between the pre-heat means and the fusing-heat means.
5. An apparatus as in Claim 4 wherein the inlet stream means includes a reservoir provided with a supply of heated metalizing powder therein; a constricted nozzle shaped outlet from the reservoir, and a source of heated gas under pressure directed into the reservoir upstream of the constricted nozzle for moving the heated powder through said nozzle into the chamber.
6. An apparatus as in Claim 1 including liquid quench means located outside and adacent the chamber for quenching the heat of the metalized body as it leaves the metalizing chamber.
7. An apparatus for metalizing an elongated body comprising, in combination:
means defining an enclosing heating chamber which is constructed and arranged to provide therein a laterally elongated passageway through which an elongated body to be metalized is adapted to be moved longitudinally;
means defining an upright disposed flow passageway which is arranged to intersect said laterally elongated passageway and the path of the body to be metalized moving longitudinally therethrough;
means for effecting movement of a metalizing wash stream, of metalizing powder entrained in gas, along said flow passageway;
a first heating means positioned along the path of movement of the elongated body, and being constructed and arranged to pre-heat a portion of the body to be metalized before said pre-heated body portion passes through said flow passageway in which it is washed by the stream of metalizing powder to the extent that metalizing powder clings to the surface of the pre-heated body;
a second heating means positioned along the path of movement of the elongated body and spaced from the first heating means and from the region in which the pre-heated body portion is washed by the stream of metalizing powder, and being constructed and arranged to heat the body portion which is coated with metalizing powder clinging thereto, to fuse the clinging metalizing powder to the body in a continuous metalizing skin of a desired thickness;
and means for moving an elongated body to be metalized longitudinally through the laterally elongated passageway while simultaneously rotating the elongated body, as the body moves longitudinally sequentially into the chamber, past the first pre-heating means, through the metalizing wash stream, past the second fusing-heat means, and outwardly from said chamber.
8. An apparatus as in Claim 7 wherein the first, pre-heat, heating means includes an electrical induction heating coil means positioned to surround the laterally moving elongated body, and being of a length and power output to locally heat, by induction, the surface of the body to a temperature of about 900 degrees F.
9. An apparatus as in Claim 8 wherein the second, fusing-heat, heating means includes an electrical induction heating coil means positioned to surround the laterally moving elongated body that has metalizing powder clinging thereto, and being of a length and power output to locally heat, by induction, the body to a fusing temperature of at least 1800 degrees F. at which the metalizing powder, that clings to the body, fuses to the body to provide a continuous metalized surface for the body.
10. An apparatus as in Claim 7 wherein the heating chamber is purged of all gases other than a non-oxidizing gas maintained therein at a temperature approximately equal to the temperature developed in the body by the first, pre- heat, heating means.
11. An apparatus as in Claim 10 wherein the non-oxidizing gas is nitrogen that is provided under a pressure that is above the pressure of gas surrounding the exterior of the chamber.
12. A method of metalizing a body of metal comprising the steps of pre-heating a portion of the body to a temperature at which metalizing powder will cling to the pre-heated body's surface; then bathing the preheated body in a flowing stream of a pre-heated metalizing powder entrained in a fluid carrier of a pre-heated, pressurized, non-oxidizing gas, so that particles of the metalizing -powder will impinge upon and cling to the surface of the pre-heated body; and then fusing the clinging, metalizing, powder to the body at a fusing temperature that is higher than the pre-heat temperature of both the body and the metalizing powder.
13. A method as in Claim 12 wherein the step of pre-heating is effected by electric induction heating of a portion of the body; and wherein the step of fusing of the clingling metalizing powder to the body is effected by electric induction heating of the body to a temperature greater than the pre-heat temperature of the body, and at a temperature at which the clinging metalizing powder fuses to the body portion.
14. A method as in Claim 12 wherein the bathing of the pre-heated body in a flowing stream of metalizing powder entrained in a fluid carrier is effected by directing a flowing stream, of a metalizing powder provided in a fluid carrier of a non-oxidizing gas, to move against the pre-heated body portion, while simultaneously rotating the body to expose all of the pre-heated surface of said body portion to impingement thereagainst by the directed flowing stream, to effect a clinging of the metalizing powder to the entire surface of the pre- heated body portion.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US37428282A | 1982-05-03 | 1982-05-03 | |
US374282 | 1982-05-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0094759A2 true EP0094759A2 (en) | 1983-11-23 |
EP0094759A3 EP0094759A3 (en) | 1984-03-28 |
Family
ID=23476086
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83302487A Withdrawn EP0094759A3 (en) | 1982-05-03 | 1983-05-03 | Apparatus for and method of metalizing metal bodies |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0094759A3 (en) |
AU (1) | AU1416783A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0119095A2 (en) * | 1983-03-14 | 1984-09-19 | Inductalloy Corporation | Apparatus for and method of metalizing internal surfaces of metal bodies such as tubes and pipes |
EP0247582A1 (en) * | 1986-05-28 | 1987-12-02 | Gec Alsthom Sa | Process for depositing a protective cobalt-chromium-tungsten coating on a vane composed of a titanium alloy containing vanadium, and vane thus coated |
WO1999000534A1 (en) * | 1997-06-27 | 1999-01-07 | Firma Hermann Heye | Method for producing a hard layer on tools, device for inductive sintering or sealing in hard layers on plungers and plugs, and plungers and plugs for producing hollow glassware |
WO2001034875A1 (en) * | 1999-11-09 | 2001-05-17 | Koncentra Verkstads Ab | Method and device for providing a layer to a piston ring |
FR2822727A1 (en) * | 2001-04-03 | 2002-10-04 | Gesal Ind | METHOD FOR APPLYING A COATING RESISTANT TO HIGH TEMPERATURES, DEVICE FOR CARRYING OUT THIS METHOD AND OBJECT PROVIDED WITH SAID COATING |
DE10102991C2 (en) * | 2000-02-19 | 2003-11-20 | Ald Vacuum Techn Ag | Device for heating a metal workpiece |
CN104911521A (en) * | 2013-12-05 | 2015-09-16 | 绵阳快典科技有限公司 | Inner bore avoidance steel pipe coating galvanization device |
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GB1177729A (en) * | 1967-04-10 | 1970-01-14 | Fritz Maak | Method and Apparatus for the production of Zinc Coatings |
DE1929153A1 (en) * | 1969-06-09 | 1970-12-17 | Friedrich Heck | Hot-dip tin, tin-lead and solder-alloy plat- - ing of metal parts, strips, wires and rods |
GB1499978A (en) * | 1973-10-31 | 1978-02-01 | Glacier Metal Co Ltd | Method of making multi-layer bearing strip |
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US2803559A (en) * | 1954-03-25 | 1957-08-20 | Coast Metals Inc | Method and apparatus for applying powdered hard surfacing alloy with induction heating |
US3436244A (en) * | 1965-06-29 | 1969-04-01 | Gen Motors Corp | Fusion coating of metal articles |
GB1177729A (en) * | 1967-04-10 | 1970-01-14 | Fritz Maak | Method and Apparatus for the production of Zinc Coatings |
DE1929153A1 (en) * | 1969-06-09 | 1970-12-17 | Friedrich Heck | Hot-dip tin, tin-lead and solder-alloy plat- - ing of metal parts, strips, wires and rods |
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Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0119095A2 (en) * | 1983-03-14 | 1984-09-19 | Inductalloy Corporation | Apparatus for and method of metalizing internal surfaces of metal bodies such as tubes and pipes |
EP0119095A3 (en) * | 1983-03-14 | 1985-01-23 | Inductalloy Corporation | Apparatus for and method of metalizing internal surfaces of metal bodies such as tubes and pipes |
EP0247582A1 (en) * | 1986-05-28 | 1987-12-02 | Gec Alsthom Sa | Process for depositing a protective cobalt-chromium-tungsten coating on a vane composed of a titanium alloy containing vanadium, and vane thus coated |
FR2599384A1 (en) * | 1986-05-28 | 1987-12-04 | Alsthom | METHOD FOR THE INSTALLATION OF A COBALT-CHROME-TUNGSTEN PROTECTIVE COATING ON A TITANIUM ALLOY DAWN COMPRISING VANADIUM AND DAWN SO COATED |
US4839237A (en) * | 1986-05-28 | 1989-06-13 | Alsthom | Method of laying a cobalt-chromium-tungsten protective coating on a blade made of a tungsten alloy including vanadium, and a blade coated thereby |
WO1999000534A1 (en) * | 1997-06-27 | 1999-01-07 | Firma Hermann Heye | Method for producing a hard layer on tools, device for inductive sintering or sealing in hard layers on plungers and plugs, and plungers and plugs for producing hollow glassware |
WO2001034875A1 (en) * | 1999-11-09 | 2001-05-17 | Koncentra Verkstads Ab | Method and device for providing a layer to a piston ring |
US6600130B1 (en) | 1999-11-09 | 2003-07-29 | Koncentra Verkstads Ab | Method and device for providing a layer to a piston ring |
DE10102991C2 (en) * | 2000-02-19 | 2003-11-20 | Ald Vacuum Techn Ag | Device for heating a metal workpiece |
US6677560B2 (en) | 2000-02-19 | 2004-01-13 | Ald Vacuum Technologies Ag | Apparatus for inductively heating a workpiece |
US6689995B2 (en) | 2000-02-19 | 2004-02-10 | Ald Vacuum Technologies Ag | Apparatus and method for healing a workpiece of metal |
FR2822727A1 (en) * | 2001-04-03 | 2002-10-04 | Gesal Ind | METHOD FOR APPLYING A COATING RESISTANT TO HIGH TEMPERATURES, DEVICE FOR CARRYING OUT THIS METHOD AND OBJECT PROVIDED WITH SAID COATING |
WO2002081773A1 (en) * | 2001-04-03 | 2002-10-17 | Gesal Industrie S.A. | Method for applying a high temperature resistant coating, device therefor and object provided with said coating |
CN104911521A (en) * | 2013-12-05 | 2015-09-16 | 绵阳快典科技有限公司 | Inner bore avoidance steel pipe coating galvanization device |
CN104911521B (en) * | 2013-12-05 | 2017-06-20 | 甘肃天和力德管道制造有限公司 | A kind of endoporus keeps away the steel pipe coating galvanizing rig of position |
Also Published As
Publication number | Publication date |
---|---|
EP0094759A3 (en) | 1984-03-28 |
AU1416783A (en) | 1983-12-01 |
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