Method of manufacturing a chromed bumper
View Patent ↗The present invention is a method for preparing and chroming a blank of steel. This method reduces time and cost to the assembly process. The method includes the following steps: heating steel slabs to a pre-determined temperature, hot rolling the steel slabs to a pre-determined width/thickness; spraying the steel strips with water to remove scaling; pickling the steel strips in acid to remove scaling; rinsing and drying the strips; cold rolling the strips with an electron beam textured tandem mill into strips having a pre-determined thickness; cold rolling the strips with an electron beam temper mill; and stamping the steel strips into a bumper.
1. A method for preparing steel for chroming, the method comprising the steps of:
providing a steel strip having a first predetermined thickness;
cold rolling the strip into a blank using an electron beam textured roller to a second predetermined thickness; and
coating the blank with Nickel and then Chromium.
2. The method for preparing steel for chroming as defined in claim 1 wherein the step of cold rolling results in a strip surface finish of approximately 0.7 to 1.2 micrometers with a nominal roughness of 0.9 micrometers.
3. The method for preparing steel for chroming as defined in claim 1 wherein the the step of cold rolling is performed by a tandem mill and a temper mill.
4. The method for preparing steel for chroming as defined in claim 3 wherein the tandem mill is a four-high four stand cold reduction mill.
5. The method for preparing steel for chroming as defined in claim 4 wherein the tandem mill and the temper mill include rolls texturized with an electron beam.
6. A method for preparing steel for chroming, the method comprising the steps of:
heating a strip of steel;
rolling the strip to a first predetermined thickness;
spraying the strip of steel with water;
immersing the strip in a descaling compound;
cleaning the strip; drying the strip;
cold rolling the strip into a blank using an electron beam textured roller to a second predetermined thickness; and
coating the blank with Nickel and Chromium.
7. The method for preparing steel for chroming defined in claim 6 , wherein a tandem mill performs the step of rolling the strip to the first predetermined thickness.
8. The method for preparing steel for chroming as defined in claim 6 , wherein the strips are heated to a temperature of approximately 2275 degrees Fahrenheit.
9. The method for preparing steel for chroming as defined in claim 6 , wherein the strips are rolled to a nominal thickness of about 9.25 inches.
10. The method for preparing steel for chroming as defined in claim 6 wherein the step of immersing the strip includes immersing the strip in one of a sulphuric acid or a hydrochloric acid.
11. The method for preparing steel for chroming as defined in claim 6 wherein the step of cold rolling results in a strip surface finish of approximately 0.7 to 1.2 micrometers with a nominal roughness of 0.9 micrometers.
12. The method for preparing steel for chroming as defined in claim 6 wherein the step of cold rolling the strip into a blank is performed first by a tandem mill and second by a temper mill.
13. The method for preparing steel for chroming as defined in claim 12 wherein the tandem mill is a four-high four stand cold reduction mill.
14. The method for preparing steel for chroming as defined in claim 12 wherein the tandem mill includes the electron beam textured roller.
15. A method of forming a chromed steel bumper comprising the steps of:
heating a strip of steel;
rolling the strip to a first predetermined thickness using an electron beam textured roller;
spraying the strip with water;
immersing the strip in a descaling compound;
cleaning the strip;
drying the strip;
cold rolling the strip using an electron beam textured roller to a second predetermined thickness;
annealing the strip;
forming the strip into a bumper;
coating the bumper with Nickel and Chromium.