JPS59208075A - Metal product metallizing process and device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the manufacturing of metal articles such as bars and tubes for making components such as bars and rods of chrome-plated steel and chrome-plated tubes with end uses such as shafts and bottles. Regarding rising.

Metallizing articles such as ordinary steel bars, rods, and tubes creates properties in the part using expensive surface layers, treatments, or coatings that are fused to the metal, but do not provide the desired properties only on the surface of the article. There are many manufacturing fields in which it is cheaper to make the whole article of the same quality (+1i and 1-1).In this way, there are rods that transmit force, piston rods, shafts of absorbers, shafts of bearings, pivot hinges, etc. It is often necessary to apply an outer layer of chrome over components such as pipes, pipes, and the like.

Ordinary copper in the form of rods or pins, other than leaded steel or sulfurized steel, coated with chromium by plating or other similar methods, and particularly adapted to the strength properties required of the part and the environment in which it is to be used. It has been known for a long time that both surface properties can be satisfied.

However, chromium is a relatively expensive substance, and its use in the various chemical bath procedures in which chromium plating can be performed is environmentally undesirable and its control difficult and expensive.

Metallizing the bar or lot surface substantially avoids the undesirable environmental effects of chemically plating these articles, but the mechanical metallizing techniques currently in use typically employ open flame torches. Although,
This torch burns acetylene, pro-2, or similar fuel gas in the presence of oxygen, preheats the surface of the article to a high temperature, and melts the powdery material into the article material. It is heated to a temperature that fuses it.

These prior art metallizing techniques have not been completely successful in metallizing tubes where the heat of the torch often burns through the tube walls.

A problem with the prior art is that it is not possible to precisely control the thickness of the layer of surface application material applied to the green article, and that the thickness of the layer heated with the torch is non-uniform. Furthermore, when metallizing powdered metal with an oven flame torch, the minimum thickness of the layer of material typically obtained is approximately 0.008 inch;
The maximum thickness of the layer is approximately 0.015 inches, both of which are much greater than the thickness of the construction material layer required to achieve the desired performance of the metallized part, which is substantially This increases manufacturing costs. Also,
Another problem is that when a fine layer of metallizing material is used to create a fused surface on a green article, the intensity of the heat from the torch is often too great and can vaporize or burn off a significant amount of the fine particles of metallizing material. It causes material and economic loss.

One object of the present invention is to provide an improved method for metallizing the surfaces of metal bars, rods and tubes by precisely controlling the thickness of the metallized surface applied to a green article. .

Another object of the present invention is to provide an improved apparatus and method for metallizing the surface of an article with a metallizing powder in a manner that substantially reduces combustion losses of the metallizing material.

A further object of the invention is an apparatus for metallizing the surface of an article with chrome powder in such a way that the thickness of the applied metal line knob layer is precisely controlled and at the same time economical losses of the metallizing powder due to evaporation or combustion are avoided. and to provide a method.

Further objects and advantages will become apparent to those skilled in the art as this specification continues to describe the disclosed invention.

In the present invention, as part of the first stage, a first induction coil is used to heat an article, such as an axially moving rod or tube, to a selected preheat temperature and to heat the metallizing material. Pour the powder onto the preheated article, rotate the article while fixing the layer of metallizing material, and then heat the article with the metallizing material by induction at the fusing temperature and in the presence of an inert gas. The metallizing material powder is fused to the article, while the metallizing powder that is not adhered is collected for reuse.

FIG. 1 is a vertical sectional view showing one embodiment of an apparatus for carrying out the method of the present invention, and shows a method and apparatus for carrying out the method of the present invention on elongated cylindrical articles. A preferred combination is illustrated.

Referring to the drawing, a vertical cross-sectional view of an apparatus for carrying out the invention is shown, including an elongated cylindrical bar 10 of steel or similar material to be metallized.
Although shown as endless, the bar 10 typically has some finite length that is greater than the length of the processing device shown. The bar is adapted to be advanced through the heating device by means of moving it in the axial or longitudinal direction of the bar 10 and simultaneously rotating the bar 10. Such devices are well known in the art of moving long articles. Typically, such devices (not shown) include a combination of paired roller discs located both forward and rearward. The bar is moved with a roller center configured therein, and the bar is maintained at least at the height shown as the area being moved.

In these above-mentioned structures, two sets of roller discs are arranged in an overlapping manner to provide a holding area on the overlapping area, and this holding area serves as a straddle for supporting the cylindrical article. The disks also serve to prevent their rotation from moving the cylindrical article axially, while the cylindrical article also rotates about its longitudinal axis. FIG. 1 shows one type of transmission means in the form of a set of inclined, drive rollers 12 and 14.

These drive rollers are oriented at symmetrical angles as shown, and are driven by a rotating source such as a power drain or motors 13 and 15, respectively, to cause the rollers to exert a lever or gripping action to move the bar. The bar is moved in the axial direction, that is, in the longitudinal direction shown by arrow 16, and at the same time, the bar is rotated in the direction of arrow ]8.

The metal bar 10 includes an enclosure or window structure means (generally 20
It is shown moving from left to right through the The window construction means constitutes a substantially enclosed and independent treatment chamber 32 . The processing chamber setting means 20 comprises a pair of space end walls consisting of a separate inlet wall 24 and an outlet wall 26, a ceiling wall 28, and a contrasting sloped portion 30 continuous to a central joint.
a and 30h, and includes rear and front walls not visible in FIG. 1. As can be understood from these illustrative drawings, the rear wall is located at the back of the drawing, and the front wall is located at the front of the drawing. The inlet wall 24 has a first or inlet opening 25 . exit wall 2
6 has a second or outlet aperture 27. The leading end of the bar 10 moves from left to right through the inlet aperture 25 into the walls 24, 26, 28 and 30 and into the substantially circumferential process chamber 32 with the rear and front walls joining together. and exit the processing chamber 32 through the exit aperture 27.

A first heating means 34 in the form of a first helical electric induction heating coil is installed in the process chamber 32, located close to the inlet aperture 25 and taking part of the metal bar 10.

Heating coil means 34 is of the type well known in the art for providing effective induction heating in gold ash articles such as bar 10. A second helical electric induction heating coil means 36 is spaced apart from the heating coil means 34 and positioned proximate the exit aperture 27 and is positioned at a point during movement of the bar 10 before the bar leaves the process chamber. surrounding it.

The first heating coil means 3 is used for a bar 10 having a diameter of 1 inch.
A typical configuration of coil means 34 is a 1-inch inside diameter four-turn coil designed to preheat a portion of the coil to approximately 900 DEG F. initially. The second heating coil means 36 is adapted to inductively heat a portion of the 1-inch diameter bar surrounded by the coil means, using a 6-turn coil having a 1-inch inner diameter to approximately 800°2 if necessary. Induction heating is performed to the chrome melting temperature above.

The power consumed by the heating coil means 36 is 10kh
The frequency of z is about 1100k. The temperature produced by an induction heater is a function of the number of turns of the coil heater and its proximity to the article being heated.

The coils 34 and 36 are axially spaced apart with respect to the bar 10 and its direction of movement, so that the preheating portion 10m of the bar 10 is located between its longitudinal coils 34 and 36. Portion 104 of the bar is subjected to an additional step of the method in the area located between said coils 34 and 36.

The preheated and exposed portions of the bar 10 are connected to the coils 34 and 3.
6 is within the process chamber 32 and is effectively located directly within the vertically projecting channel extending between the discharge nozzle or spout 40 and the lift or return pipe 42. More specifically, above the top wall 28 of the process chamber setting means 20 there is a sump or supply pipe 44 from which the metallizing powder, p, is supplied.

The lower end of sump 44 connects to the upstream end of nozzle 40, the interior of which defines a tapered metering funnel 45 as shown, the lower end of which is configured and terminates in a discharge aperture 46. . When the reservoir 44 is taken in, a fixed amount of metallizing powder is supplied at the beginning of the month (not shown), and the metallizing powder is fed downward from the reservoir 44 by gravity.

The upstream portion of the reservoir 44 has a laterally extending coupling tube 48 by means of which pressurized gas is supplied from a source (not shown). Pressurized gas can also be supplied through the reservoir 44 from the intake. The gas used to aid the flow of metallizing powder from the funnel discharge opening 46 down across the bar portion 10a may be nitrogen or ion.
A non-oxidizing gas such as a noble gas selected from the group including argon and argon. Preferably, the gas is nitrogen at a pressure of 5 psi excess above atmospheric pressure and at a preheat temperature of at least 900°F. The entire interior of the processing chamber 32 is supplied with nitrogen gas by an inlet pipe 49 through the top wall at least 9 times.
Serve at a high temperature of 00°F.

The metallizing powder 46 and the propelling and entraining nitrogen gas are discharged through the aperture 46, entraining the metallizing powder 46 at the next 0.degree. Flowing as a fluid stream, the heat in the preheating bar portion 102 causes the metallizing portion 46 in the fluid stream to become fixed on the preheating surface of the bar. As the bar 10 is continuously rotated, a continuous coating of powder is applied to the portion IQa-.

Passing above bar 10 and below bar 1 (EZ), the nitrogen and metallizing first-of-the-month wash stream is recaptured in a sump or recovery pipe. These carry the recaptured stream to a recapture device, Recycle the gas and powder together into intake tube 48 or sump 44, or recapture the fluid for selective recovery of powder and gas together or separately, as desired. is located on the intake side of a diaphragm-type pump (not shown) so that it can be usefully used in a fluid gas-particle recovery system.

Attach the bar part 105 to this bar part (move it in the axial direction when coating it with metallizing), move the bar part 105 into the open core heating coil 36, Therefore, the induction temperature was increased to about 1800° F. or above, and adhesive powder 46 was fused to portion 10d of bar 1.
The effect is to form a continuous metallized surface 1 on top of 0.

This fusion and metallizing bar part is designed to be 10A.

As an example of the metallizing process used, Michi
Colmonoy Coyp in Detroit, Gan.
, adopted metallizing of the pipes. Especially Co 1monyAlloy 16.62 and 63
had a specific gravity of 7.8 (Rockwell hardness C scale of 58-'63) and a melting point of 1875°F.

Alloys with other numbers have large specific gravity values and a maximum of about 2250°
It had a high melting point of up to F.

Part 1 of the bar with metallized and fused surface
After exiting the processing chamber 32 through the exit aperture 27, the metallized bar portion was passed through water quenching in the form of a ring or ring. One or more streams of cooling water penetrated the interior and were opposed to the metallized surface of the ivy-treated bar portion 10h.

Through use of the present invention, metallized surfaces with thicknesses ranging from 0.002 to 0.015 inches can be obtained.

The minimum thickness of the metallizing surface or layer is, in the practice of the present invention, less than about a percent of the minimum thickness obtained by the use of the prior art, torch, and previously discussed techniques. This leads to the practical economics of using metallizing powders. Its cost is currently about $6-8/lb. Additionally, using torch techniques, only up to about 70% of the metalized material adheres to the surface of the metallized component, whereas with the present invention disclosed herein, at least 90% of the metallized material adheres to the surface of the component. It adhered to the surface and showed an efficiency of 90% for the use of metallizing powder.

After quenching and cooling the metallized bar part, the metallized bar is cut to the required shaft length, and then further finishing treatment is performed using a lathe or other operations.
You can also get pieces of the bar.

Pressurized gas is applied inside the heating chamber 32, and due to the size of the inlet opening 25 and outlet opening 27, it is observed that some gas and accompanying metallizing powder escape; Measures such as systems are used, and again /
It has been recognized that the loss of fluid and entrained metallizing powder through such apertures can be reduced or limited by the provision of apertures. However, it is believed that the losses are so unrealistic that expensive loss prevention measures and cost-linked methods are not acceptable.

Although the inventors disclose a method and apparatus for metallizing common metal articles, it is understood that the invention could be used with other or specialized materials; It will be understood by those skilled in the art that it is intended to cover all aspects of the invention, limited only by the scope of the claims.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the invention. 10: Bar 12: Roller 13: Motor 14: Roller 15: Motor
20: Enclosure 24: Entrance wall 25: Inlet opening 26: Outlet wall 27: Exit opening 28: Top wall
30: Bottom wall 32: Processing chamber 34: Induction coil 36: Induction coil 40: Nozzle 42: Recovery pipe 44: Reservoir 45: Funnel 46: Opening part 48: Combined circulation
Metallizing Powder 49: Gas Inlet Pipe Patent Applicant Induct Alloy Corporation Procedures Amendment (Method) July 3, 1932, Showa Year & 6 Patent Application No. 7'1g7r 6, with the case of the person making the amendment Related Application Person's address Z f,'[,i>gutsdoor0i,tsuichi:f,'b
＞・N4, Date of agent 58 amendment order Showa Onnaza year? 80th of the month (shipment date) 7. Contents of amendment

Claims (1)

[Claims] (11) A method for metallizing a metal article comprising the following steps; A part of the metal article is preheated to such a temperature that the metallizing powder adheres to the surface of the preheated metal article. Step: The preheated article is then exposed to a flow of preheated metallizing powder carried in a fluid carrier consisting of a preheated and pressurized non-oxidizing gas to preheat the particles of metallizing powder. impinging on and adhering to the surface of the metal article; then applying the adhered metallizing powder to the metal article at a fusing temperature higher than the preheating temperature of either the metal article or the metallizing powder; A step of fusing. (2) The preheating step is performed by electrically induction heating a part of the metal article, and the step of fusing the fixed metallizing powder is performed at a temperature higher than the preheating temperature of the metal article. , and is carried out by electrically induction heating the metal article to a temperature at which the fixed metallizing powder fuses to the metal article. 3) exposing a preheated metal article to a stream of metallizing powder carried in a fluid carrier, or exposing a preheated metal article to a stream of metallizing powder carried in a fluid carrier comprising a non-oxidizing gas; part of the metal article and at the same time rotate the metal article so that all preheated surfaces of the metal article part are exposed to impingement (C) by the powder-containing stream; The method according to claim 1, characterized in that the metallizing powder is adhered to the entire surface of the preheated metal article part. Apparatus for metallizing a long article consisting of a combination of components: A processing chamber with external pressure applied to the periphery; One end of the long article is introduced into the chamber while moving in the axial direction of the article, so that σ A first aperture provided in the processing chamber for entry, and a second aperture provided in the processing chamber through which the leading end and main body of the elongated article are discharged while moving in the axial direction. Section: ``Moving the long article through the first opening section to a processing chamber, and then passing through the processing chamber,
means for moving the article to the outside of the processing chamber through the second opening; first heating means provided within the processing chamber for locally heating the article to an initial high temperature; A second high temperature which is heated at a higher temperature than the first temperature is provided in the processing chamber at a certain distance from the heating means.
second heating means for locally heating the article to an elevated temperature of; discharging a stream of metallizing powder into the processing chamber;
reaching a state where the powder stream covers and washes the entire surface of the heated part of the article being heated to the first high temperature;
A metallizing powder supply means is arranged to cause a deposited layer of metallizing powder to form on the heated portion of the article, and this takes place before the article is heated at a second high temperature. (The second high temperature is selected at such a temperature that the deposited metallizing powder layer fuses to the article); means for rapidly cooling the heat of a metallized article. (5) A device for metallizing long articles consisting of a combination of the following components: A first opening for introducing the long articles into the room and discharging the metalized long articles to the outside. means for providing an enclosed metallizing processing chamber having a second aperture for axially advancing the elongated article relative to the processing chamber, while simultaneously moving the article along its longitudinal axis; Interlocking means functionally interlocking with the elongate article for rotation about the elongate article; after the elongate article has entered the processing chamber, 'as the article progresses through the chamber, a portion of the article is moved to a first selected object; Preheat! Heating means provided in the processing chamber for localized heating to the crystallinity; A wash stream is generated and applied to the rotating preheated part while advancing axially, so that a portion of the metallizing powder in the wash stream is directed onto the preheated part. and means for locally heating the coated article portion to cause the coated article portion to undergo a methane treatment before the coated article portion is ejected from the processing chamber. Localized heating means provided within the processing chamber to cause a coating of metallizing powder to fuse to the article part. (6) A wash stream consisting of metallizing powder and non-oxidizing gas is applied to the metallizing powder. Claim 5, characterized in that the mixture is a mixture of powder and nitrogen, and is heated to at least the same heating degree as the preheated part of the article. (7) The processing chamber passes a cleaning flow consisting of fine metallizing powder particles and gas through a flow path that crosses the direction of movement along the axis of the elongated article, and fuses the cleaning flow with the preheating means. 4. means for introducing the powder-containing air stream at intervals for determining the direction of the growth motion along a flow path that traverses a position through which the elongate article moves axially intermediate the means;
6. The apparatus according to claim 5, further comprising J1 output means. (8) The air flow introducing means includes a reservoir provided with a supply of heated metallizing powder, a constricted nozzle-shaped outlet provided in the reservoir, and a constricted nozzle-shaped outlet provided to the reservoir, and processes the heated powder from the nozzle. Claim 7, characterized in that it has a supply source that supplies pressurized heated gas to a portion of the reservoir upstream of a constricted nozzle for moving the device across the room. equipment. (9) Metallized items are acceptable. Claims characterized in that a rapid cooling means is provided adjacent to the processing chamber, such as outside the processing chamber, for rapidly cooling the article by removing heat from the article when leaving the creasing processing chamber. Apparatus according to paragraph 4. (10) An apparatus for metallizing an elongated article consisting of a combination of the following components; providing a passageway extending laterally for longitudinal movement of the elongated article to be metallized; means for forcing an encircling heating chamber constructed and arranged to: a vertically disposed transversely extending passage and a path in which the article to be metallized travels longitudinally; means for providing a path for the flow of the elongated article; means for effecting the movement of the flow that showers the metallizing powder carried in the gas along said flow path; a portion of the article to be metallized before passing through said flow path, which is located along said flow path and is bombarded with a flow of metallizing powder to such an extent that the metallizing powder adheres to the surface of the preheated article. a first heating means constructed and arranged for preheating the elongated article; and wherein the first heating means and the preheated portion of the article are bathed by a flow of metallizing powder; The part of the article that is positioned a certain distance from the area to be coated with the metallizing powder and is coated with the metallizing powder is heated to fuse the adhered metallizing powder to a desired thickness. a second heating means for forming the article with a continuous metallizing coating; and simultaneously rotating the elongate article while moving the elongate article to be metallized through the longitudinally and laterally extending passages; means for longitudinally moving the resultant article into the processing chamber, passing through a first heating means, being exposed to the stream of metallizing, passing through a second heating means and outwardly from said processing chamber; (11) A first heating means for preheating is located around the laterally moving elongated article and includes a preheating means for locally heating the surface of the article to a temperature of about 900°F by induction. [Claim 12I] The apparatus according to claim 10, characterized in that the second heating means includes an electric induction heating coil means having an output of is located around a laterally moving elongated article to which it is attached, and which guides the article at least once
having the length and power of a vessel heated to a fusing temperature of 800° F. at which temperature the metallizing powder adheres to the article to provide a continuous metallized surface to the article; Claim 11 characterized by
The equipment described in section. A patent characterized in that the first heating means for preheating removes from the heating chamber all gases other than non-oxidizing gases maintained at a temperature approximately equal to the temperature generated in the article. The apparatus according to claim 10. (1.D. A patent characterized in that the non-oxidizing gas is nitrogen which is forced at a pressure higher than the pressure of the gas surrounding the outside of the heating chamber. Apparatus according to claim 13.