Mirror Roll

Today we will tell you the steps of the mirror roll processing process.
First, the component welding:

Set the inner plate, shaft head, bushing, blocking plate, inner tube, etc., the inner tube is within 50g of static balance, the inner tube is spiraled to the line, and the flat steel flow path is welded.

Second, with car, equipment, welding:

The inner tube of the vehicle, the size and the outer tube are 0.4mm, the angle of the two plates is 15X30 degrees, the inner tube is polished, the slag is cleaned, the inner tube size is checked, and the outer tube inner diameter is adapted. The hot sleeve is in place and is to be cooled. After shrinking, the overall assembly is welded. (Note: 45# steel before welding, after welding)

Third, annealing, roughing, quenching:

Annealing heat treatment, process quenching and tempering, multiple de-stressing, rough car retention, static balance, greater than 50g, need to calculate the amount of borrowing, borrowing on the lathe.

Quenching: Surface hardness requires HRC 58 ° - 60 °, no cracks on the roll surface.

Fourth, fine car, rough grinding:

Two-axis head trimming pin hole, two-axis head to roll surface beating, <0.05, according to the drawing requirements processing length to size, outer circle margin, 0.5-0.6. The grinding support circle is used as the bracket position, and the roller surface size is required according to the figure. The Ra0.5 two-axis head beats the roller surface <0.02.

5. Dynamic balance, electroplating and fine grinding:

Do the dynamic balance G40 level, block the venting holes, do pressure test without leakage, and do the water pressure unblocking experiment. Electroplated hard chrome, single side 0.15 chrome layer uniform without pinholes, shedding and other defects. Finely grinding the two shaft heads, the two bearing blocks on the roll surface beat <0.01 roughness 0.8. The remaining shaft heads are ground to the tolerance range.

6. Scrub and fine grinding mirror:

Grinding the roll surface with a disc grinder, inspecting the roll surface, waterless ripples, spiral lines, needle eyes, flies and other enamel. Polishing machine tool, throwing roller surface to roughness Ra0.01-0.005 (shininess up to 14) to achieve super-mirror surface. After chrome polishing, the hardness is HRC62°.