Patent Grant
8974269
1. Field of the Invention
The present invention relates to a method for surface-treating a mirror-finish stainless steel workpiece, particularly to a method using a series of grinding steps to polish and mirror-finish the surface of a stainless steel workpiece.
2. Description of the Related Art
Some mirror-finish stainless steel workpieces, such as an electric elevator, are unlikely to be fabricated in form of an integral one-piece body but are usually assembled piece by piece with welding. The irregularities caused by welding degrade appearance esthetics and thus need to be finished with grinding, coarse polishing, fine polishing, etc. In the conventional grind-polish technology, tool marks, such as grinding marks and polishing marks, still remain on the fine-polished surface. Further, over-grinding may cause over-heating and distortion on the surface of the mirror-finish stainless steel workpiece. Besides, the conventional grind-polish technology cannot indeed achieve a mirrorlike surface.
On the other side, the stainless steel workpieces, which have been installed in a building, usually have scribed marks, abrasion, corrosion, pollution, etc., on the surface thereof. However, the conventional grind-polish technology is hard to maintain or repair the surface of an electric elevator in situ.
“Buffing Kit Instructions: Part #50341” disclosed a buff and compound to polish and grind a surface by using a leaf buff, a wool buff, sisal buff, a muslin, etc. to grind. But, it left polishing traces. Furthermore, it did not disclose to use a sponge having a density from 35 kg/m3 to 45 kg/m3 to polish or grind a mirror-finish stainless steel workpiece.
Accordingly, the present invention proposes an innovative method for surface-treating a mirror-finish stainless steel workpiece, which can overcome the conventional problems, and which can promote the esthetics of the polished surface and facilitate in-situ polishing.
Based on many years' experience in the related field and with persistent research and experiment, the Inventor has been devoted to improving the surface treatment technology and thus proposes a method for surface-treating a mirror-finish stainless steel workpiece of the present invention.
The primary objective of the present invention is to provide a method for surface-treating a mirror-finish stainless steel workpiece, which uses both mechanical and chemical methods to promote the appearance esthetics of a workpiece and achieve a mirrorlike surface.
Another objective of the present invention is to provide a method for surface-treating a mirror-finish stainless steel workpiece, which uses both mechanical and chemical methods to prevent from distortions or recessions caused by over grinding.
A further objective of the present invention is to provide a method for surface-treating a mirror-finish stainless steel workpiece, which can perform surface polishing in situ without dismounting the workpiece.
It is an further objective of the present invention to provide a method for surface-treating a mirror-finish stainless steel workpiece, comprising steps:
To achieve the abovementioned objectives, the present invention proposes a method for surface-treating a mirror-finish stainless steel workpiece, which comprises at least the following steps: (1) dividing the surface of a mirror-finish stainless steel workpiece into different grinding areas according to the depths of the scratches; (2) selecting a sand paper having an appropriate grit size for one grinding area, and using a grinder and the sand paper to grind the grinding area; (3) examining whether all the scratches on the grinding area have been eliminated; undertaking Step (5) if the answer is yes; undertaking Step (4) if the answer is no; (4) selecting a sand paper having a greater grit size, and using a grinder and the sand paper to grind the grinding area again, and then undertaking Step (3); (5) examining whether the scratches of all the grinding areas have been eliminated; undertaking Step (6) if the answer is yes; undertaking Step (2) if the answer is no; (6) applying a first polishing agent to all the grinding areas; (7) using a grinder and a first grinding material to eliminate the sand abrasions from all the grinding areas; (8) applying a second polishing agent to all the grinding areas; (9) using a grinder and a second grinding material to eliminate all the marks scribed by the first grinding material from all the grinding areas; (10) applying a third polishing agent to all the grinding areas; (11) using a grinder and a third grinding material to perform a final grinding on all the grinding areas; (12) applying an abrasive paste to all the grinding areas, and letting the abrasive paste stay still on all the grinding areas for a given period of time; (13) using a fourth grinding material to perform mirror-finishing on all the grinding areas,
wherein the fourth grinding material is a sponge having a density from 35 kg/m3 to 45 kg/m3.
According to the method of the present invention, preferably said first polishing agent used in said step (6) is a polishing agent comprising of aluminum oxide particles suspended in stearine, waxes and fats that can fast cut various metals and generates medium brightness.
According to the method of the present invention, preferably said first grinding material used in said step (7) is a sisal buff.
According to the method of the present invention, preferably said second polishing agent used in said step (8) is a polishing agent comprising aluminum oxide particles suspended in stearine, waxes and fats that has high grinding efficiency, can fast remove scratches on a surface of a metal, and generates lower brightness.
According to the method of the present invention, preferably said second grinding material used in said step (9) is a cotton buff.
According to the method of the present invention, preferably said third polishing agent used in said step (10) is a polishing agent comprising aluminum oxide particles suspended in stearine, waxes and fats that can fast cut various metals, contains less wax having a wax content less than that of the second polishing agent, and generates a very clean surface having medium brightness.
According to the method of the present invention, preferably said third grinding material used in said step (11) is a wool buff.
According to the method of the present invention, preferably said abrasive paste used in said step (12) contains at least diluted nitric acid, alumina powder, xanthan gum, water, bentonite, and fragrance.
According to the method of the present invention, preferably said given period of time in said step (12) is 30-60 minutes.
According to the method of the present invention, preferably said fourth grinding material used in said step (13) is a high-density and tough sponge.
To achieve the abovementioned objectives and efficacies, the Inventor has persistently improved the conventional technologies and thus proposes a method for surface-treating a mirror-finish stainless steel workpiece, which uses a plurality of polishing agents, grinding materials, and abrasive pastes to enhance the polishing effect. Below, two embodiments are used to demonstrate the technical principles and process of the present invention.
Refer to
In the first embodiment, the first polishing agent adopted in Step 106 is of a BRIGHT-CUT grade (Red bars, consisting of aluminum oxide particles suspended in stearine, waxes and fats), which can fast cut various metals and generates medium brightness. The first grinding material used in Step 107 is a sisal buff, which cooperates with the BRIGHT CUT agent (Red bars, consisting of aluminum oxide particles suspended in stearine, waxes and fats) to smooth all the sand abrasions on all the grinding areas. The second polishing agent adopted in Step 108 is of a FASTCUT grade (Grey bars, consisting of aluminum oxide particles suspended in stearine, waxes and fats), which has high grinding efficiency and can fast remove the scratches on the surface of a metal, generating lower brightness. The second grinding material used in Step 109 is a cotton buff, which cooperates with the FASTCUT agent (Grey bars, consisting of aluminum oxide particles suspended in stearine, waxes and fats) to remove the marks scribed on all the grinding areas by the first grinding material. The third polishing agent adopted in Step 110 is of a WHITE CUTTER P2 grade (white bars, consisting of aluminum oxide particles suspended in stearine, waxes and fats), which can fast cut various metals, contains less wax, and generates a very clean surface having medium brightness. The third grinding material used in Step 111 is a wool buff, which cooperates with the WHITE CUTTER P2 agent (white bars, consisting of aluminum oxide particles suspended in stearine, waxes and fats) to perform a final grinding on all the grinding areas.
In the first embodiment, the abrasive paste used in Step 112 contains at least diluted nitric acid, alumina powder, xanthan gum, water, bentonite, and essence. After applied to all the grinding areas, the abrasive paste stays still on the surface of the workpiece for 30-60 minutes. Then, the process proceeds to Step 113. The fourth grinding material used in Step 113 is a high-density and tough sponge, which cooperates with the abrasive paste to perform mirror-finishing on all the grinding areas. Thus is achieved a highly reflective mirrorlike surface on a stainless steel workpiece.
Refer to
Refer to
In the second embodiment, the first polishing agent adopted in Step 308 is of a BRIGHT-CUT grade, which can fast cut various metals and generates medium brightness. The first grinding material used in Step 309 is a sisal buff, which cooperates with the BRIGHT CUT agent (Red bars, consisting of aluminum oxide particles suspended in stearine, waxes and fats) to smooth all the sand abrasions on all the grinding areas. The second polishing agent adopted in Step 310 is of a FASTCUT grade (Grey bars, consisting of aluminum oxide particles suspended in stearine, waxes and fats), which has high grinding efficiency and can fast remove the scratches on the surface of a metal, generating lower brightness. The second grinding material used in Step 311 is a cotton buff, which cooperates with the FASTCUT agent to remove the marks scribed on all the grinding areas by the first grinding material. The third polishing agent adopted in Step 312 is of a WHITE CUTTER P2 grade (white bars, consisting of aluminum oxide particles suspended in stearine, waxes and fats), which can fast cut various metals, contains less wax, and generates a very clean surface having medium brightness. The third grinding material used in Step 313 is a wool buff, which cooperates with the WHITE CUTTER P2 agent to perform a final grinding on all the grinding areas.
In the second embodiment, the abrasive paste used in Step 314 contains at least diluted nitric acid, alumina powder, xanthan gum, water, bentonite, and essence. After applied to all the grinding areas, the abrasive paste stays still on the surface of the workpiece for 30-60 minutes. Then, the process proceeds to Step 315. The fourth grinding material used in Step 315 is a high-density and tough sponge, which cooperates with the abrasive paste to perform mirror-finishing on all the grinding areas. Thus is achieved a highly reflective mirrorlike surface on a stainless steel workpiece.
From the above description, it is known that the present invention has the following advantages:
In order to erase scratches and to recover and to be buffed to a mirror shine, a manual polishing machine needs two kinds of polishing methods of the present invention. One is vertical-type polishing (1000-2500 rpm) and the other is rotary-type polishing (800-1000 rpm). To collectively use the above two kinds of polishing methods, a real mirror shine without scratches can be obtained.
A method of processing mirror-finish stainless steel having scratches of the present invention is to use chemical polishing method comprising steps of reacting a diluted nitric acid with a surface of the stainless steel to coat and to form special chemical oxidation reaction and mirror-finish grinding the surface with a H-T40 sponge (preferably dry after wetting) in combination with mechanical polishing method (to erase scratches and to grind the scratches into smooth surface). A compound slurry, in combination with a slightly wetting H-T40 sponge having a middle or low density is used to grind at 800-1000 rpm in order to decrease a surface grinding temperature greatly and to avoid generating recess due to high temperature on the stainless steel surface. After repeating the above steps 2-3 times, a real mirror-finish shine is obtained.
The sponge used as fourth grinding material in step 13 has a density from 35 kg/m3 to 45 kg/m3. The sponge is commercially available from Homing Spomge Inc located at New Taipei City, Taiwan. The composition of the sponge comprises Poiypropy Lene Gljycol (tradename), Tdluene Diisocyanate (tradename), Silicone (tradename), Amine (tradename), and Catavct (tradename). The objective of usage of the sponge is to grinds and polishes the white mist surface of a stainless steel workpiece by means of a polishing agent to recover the mirror-like surface to chromium color polish. The sponge is a medium used in polishing and grinding and to clean the dirty matter and to coat and apply. The sponge can be used for a long time having a certain density and strength, and not easily degrade or to generate a new scratches. The sponge can obtain a excellent surface-treating processing on a large surface without generating a color difference. The sponge can absorb vibration of the hand-grinding machine to transfer heat easily on the working surface. The workpiece can not be easily distorted.
The polishing effects of this invention are listed as follows: Brightness of an inside stainless steel of an elevator was measured after polishing processing.
From the above Table 1, the polishing effect (brightness, 1364 gu) of this invention is much better than that (413 gu) of prior arts.
The embodiments described above are only to demonstrate the technical contents and characteristics of the present invention to enable the persons skilled in the art to understand, make, and use the present invention. However, these embodiments are not intended to limit the scope of the present invention. Therefore, any equivalent modification or variation according to the spirit of the present invention is to be also included within the scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 99115728 A | May 2010 | TW | national |
This application is a Continuation-in-Part application of the pending U.S. patent application Ser. No. 12/829,211 filed on Jul. 1, 2010, all of which is hereby incorporated by reference in its entirety. Although incorporated by reference in its entirety, no arguments or disclaimers made in the parent application apply to this divisional application. Any disclaimer that may have occurred during the prosecution of the above-referenced application(s) is hereby expressly rescinded. Consequently, the Patent Office is asked to review the new set of claims in view of the entire prior art of record and any search that the Office deems appropriate.
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| Number | Date | Country | |
|---|---|---|---|
| 20130059504 A1 | Mar 2013 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 12829211 | Jul 2010 | US |
| Child | 13668910 | US |
