Advancements in Single-Pass Bore Finishing - Systems Approach (pag. 2 of 10)
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Advancements
Manufacturers are continually pushing the envelope in regards to what can be accomplished with the singlepass Processo. Improved tool, fixture, and machine designs
have allowed for increased production rates as well as improved bore precision. The following are some of the latest advancements that have been made.Bore precision:
With upgraded CNC motion capability, combined with advanced fixture design, the singlepass Processo can now achieve higher bore precision than ever before. Bore
roundness and straightness to better than 0.2um (.000008”) is possible. In fact, total bore cyclindricity to better than 0.4um (.000016”) has been achieved.
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 Typical fuel pump with single-pass tool |
Case History #1 (Fuel Pump)
| Diameter: | 12mm | Length: | 39mm |
| Material: | 52100 | Hardness: | 6064 HRC |
| Bore Type: | Thru | Stock Removal: | 0.070mm |
| Tool Pass #1: | 11.952mm | Diamond Size: | 40/50 |
| Tool Pass #2: | 11.972mm | Diamond Size: | 40/50 |
| Tool Pass #3: | 11.992mm | Diamond Size: | 40/50 |
| Tool Pass #4: | 11.998mm | Diamond Size: | 100/12 |
| Tool Pass #5: | 12.000mm | Diamond Size: | 200/230 |
| Tool Pass #6: | 12.0010mm | Diamond Size: | 325/400 |
| Tool Pass #7: | 12.0013mm | Diamond Size: | 600 |
| Tool Pass #8: | 12.0015mm | Diamond Size: | 1200 |
| Bore Quality | Required | Achieved |
| Size: | ±0.0015mm | 0.001mm |
| Roundness: | 0.3µm | 0.15µm |
| Straightness: | 0.3µm | 0.15µm |
| Cylindricity: | 0.4um | 0.4um |
| Surface Finish: | 0.6Rz | 0.3Rz |
| Machine Type: | Engis Model # 0318-18 (8 Spindle Machine) |
| Coolant: | Engis SP2240 Levigatura Oil |
| Production: | 60 Parts Per Hour |