The main purpose of profiling is to ensure that the outer contour shape of the piston ring is consistent with the designed pressure curve.

1. Rough grinding end surface: blank height dimension = front ring height of cutting disc + rough grinding allowance (0.7-0.8 double discs)
Cutting disc: the height of the front ring of the cutting disc = the width of the cutter + 2× (the height of the ring after the middle grinding + the middle grinding allowance);   The width of the cutting knife is generally 1.8~2.2, and the middle grinding allowance is generally 0.18 (double-sided)
2. Middle grinding end face: semi-finishing height + semi-finishing allowance; semi-finishing allowance is generally 0.16~0.20 (double-sided)
Semi-finish grinding end face: fine grinding height + fine grinding allowance; alloy ring fine grinding allowance generally takes 0.03~0.035 (double-sided); ductile iron ring generally takes 0.05 (double-sided)
3. Finish grinding end face: decide whether to wear and re-grind according to the processing technology
4. Copying car: long diameter size
5. Milling cut: length of cut
6. Rough boring inner circle: determination of radial thickness; fine boring inner circle radial thickness + fine boring inner circle allowance + fine turning outer circle allowance. The machining allowance of fine boring inner circle and fine turning outer circle is generally 0.2mm
7. Rough repair of the opening: the closed gap is generally 0.15-0.35, and the inner diameter of the ring gauge is generally φd1 (the basic size of the piston ring) + 0.65
8. Finish turning outer circle: the radial thickness of the finished substrate + fine boring inner circle allowance + outer honing allowance; fine boring inner circle allowance is generally
0.2mm, the honing allowance is generally 0.03~0.05mm. Determination of the closed gap: on the basis of the rough trim size, put 0.05 on the upper and lower sides
9. Fine boring inner circle: the radial thickness of the finished product-the thickness of the chromium layer + the honing allowance before plating; the thickness of the chromium layer is determined by the process, and can not only refer to the product drawing. The honing allowance before plating is generally taken as 0.05
10. Chamfering outer angle: generally 0.2X45°, the purpose is to prevent chrome plating from falling off chrome
11. Finishing the mouth before plating: Confirm according to the closed gap after the middle grinding, the margin on one side of the opening is 0.10
12. Inspection before plating
13. Honing before plating: the allowance of one side is 0.05
14. Check the appearance before plating
15. Chrome plating: finished chrome plating thickness + honing allowance after plating
16. Demagnetization
17. Middle grinding opening: It is determined according to the size of the finished product, and the prerequisite is to ensure that there is a margin for the fine grinding opening, but not too large. Generally, the unilateral margin is 0.05~0.10m
18. Honing after plating: Unilateral margin 0.05
19.Inspect the appearance after plating
20. Fine grinding opening: determine the ring height according to the product drawing requirements
21. Re-grinding: Determine the ring height according to the requirements of the product drawings
22. Wedge surface of car: 1.5 from the outer circle, base circle height 1.061±0.01, wedge angle 7°15′±15′
23. Grinding positioning groove: according to product drawing requirements
24. Oil honing outer circle: Oil honing for 10 seconds to ensure closed gap and unilateral margin
25. Phosphating
26. Laser marking