Method for fabricating super mirror finish stainless steel decorative sheet

Abstract

The present invention provides a method for fabricating a super mirror finish stainless steel sheet uses the following steps: 1) rough machining, wherein a 400-450 grit sandpaper or scouring pad is used to remove an oxide layer on a surface of a stainless steel decorative sheet; 2) finish machining, wherein a 240-1,000 grit graphite grinding wheel is used to perform finish grinding; and 3) polishing processing, wherein an abrasive material is used to perform polishing. For the finish grinding and the polishing that are performed by using the grinding wheel and the abrasive material respectively, a multi-shaft polishing system is used to drive a grinding wheel, and a cylinder is controlled to adjust a force of each polishing shaft, which enables a stainless steel decorative sheet to have a surface finish under 0.01 μm and a reflectivity above 69%.

Claims

1. A method for fabricating a super mirror finish stainless steel sheet, comprising the following steps: 1) performing rough machining on a 2B or BA stainless stell sheet, by using a 400-450 grit sandpaper or scouring pad to remove an oxide layer on a surface of the stainless steel sheet; 2) performing finish machining on the stainless steel sheet from step 1), by using a 240-1,000 grit graphite grinding wheel to perform finish grinding; 3) performing polishing processing on the stainless steel sheet from step 2), by using an abrasive material slurry together with polishing wheels, wherein the stainless steel sheet from step 2) is subject to a multi-shaft polishing system, and each polishing shaft drives a polishing wheel, and a cylinder is used to adjust pressure for each polishing shaft in the multi-shaft polishing system, so that all shafts are driven under a same pressure and have equal polishing force 4) obtaining a super mirror finish stainless steel sheet, having a surface finish under 0.01 μm and a reflectivity about 69%.

2. The method according to claim 1, further comprising transferring the stainless steel sheet in steps 1)-3) between rollers, and using a soft and elastic sponge roller as a top roller.

3. The method according to claim 1 wherein the abrasive material slury is made by the following method steps: adding 5-8 kg of aluminum oxide into 1,000 kg water, and then adding 20 kg oxydol to the aluminum oxide mixture; wherein the grain size of the aluminum oxide is selected from 2,000 grits, 4,000 grits, and 6,000 grits.

Description

DETAILED DESCRIPTION OF THE EMBODIMENT

(1) Steps of the present invention are as follows: 1) rough machining, where a 400-450 grit sandpaper, for example, a 400 grit scouring pad, is used to remove an oxide layer on a surface of a stainless steel sheet; 2) finish machining, where a 240-1,000 grit graphite grinding wheel, particularly, an 800-1,000 graphite grinding wheel, is used to perform processing, so that “hills” on the surface are smoothed; and then polishing is performed by using an abrasive material.

(2) Polishing is performed by using a multi-shaft system, and a cylinder is used to adjust a force of each polishing shaft, so that each polishing shaft of the multi-shaft system has the same force, and each grinding wheel driven by each polishing shaft has the same abrasive force. This enables surface quality of a mirror finish sheet that is made by abrasion to achieve an ideal state. Polishing equipment is modified, where a digital force sensor (Toledo) is installed between a polishing drive shaft and a polishing wheel. A multi-shaft automatic force numerical control apparatus (“Toledo” 8424B force numerical-controlled instrument) is used, and a force meter is used for display purpose. Then, adjustment is made so that the abrasive force of each grinding wheel is the same (forces displayed by the force numerical-controlled instrument are the same). The force of the polishing shaft is manually adjusted because a difference between polishing forces directly affects surface polishing quality of the decorative sheet.

(3) A recipe of the abrasive material that is used for the polishing processing is: adding 5-8 kg aluminum oxide into 1,000 kg water, and then adding 20 kg oxydol. The aluminum oxide is classified according to grain sizes into those of 2,000 grits, 4,000 grits, 6,000 grits, and the like. The aluminum oxide of these grits may all be used, while a larger grain size produces a larger abrasive force. Certainly, a smaller grain size produces a better condition, and an abrasive duration is more than 10 minutes.

(4) In a transferring process, a soft and elastic sponge roller is used as a top roller to prevent sheet surfaces from being damaged by pressing, where a damage of the sheet surface affects surface quality.

(5) A Siemens direct current scheduling apparatus, a Mitsubishi PLC controller, and a “Toledo” 8424B force numerical-controlled instrument are converted into a high-precision grinding and polishing automatic control device. Product quality is greatly improved by using the above improvements.