PRIDE OF QUALITY PARKWON STEEL BALL
Nó là vật liệu có độ cứng và khả năng chống mài mòn cao được sử dụng cho vòng bi ô tô.
Nó là một sản phẩm có độ bền đồng đều từ bề mặt đến lõi thông qua quá trình xử lý nhiệt làm cứng trước và là vật liệu được sử dụng rộng rãi bởi tất cả các công ty vòng bi.
| Hàn Quốc KS | Trung Quốc GB | Nhật Bản JIS | Mỹ ASTM | Đức DIN |
|---|---|---|---|---|
| STB2 | Gcr15 | SUJ2 | S2100 | 100Cr6 |
| Weight% | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ký hiệu nguyên tố | C | Si | Mn | P | S | Cr | Ni | Mo | Cu | AI | Mo | Pb | Sb | Sn | As | O2 | Ti | Ca | H2 |
| Tối thiểu | 0.95 | 0.15 | 0.25 | 1.35 | |||||||||||||||
| Ký hiệu nguyên tố | 0.98 | 0.35 | 0.45 | 0.025 | 0.015 | 1.60 | 0.25 | 0.10 | 0.25 | 0.05 | 0.1 | 0.002 | 0.005 | 0.03 | 0.04 | 0.0012 | 0.003 | 0.001 | 0.0002 |
| Quy trình kéo liệu | độ cứng | , tốc độ giảm mặt cắt ngang | tốc độ hình cầu, | A.G.S | khử cacbon | độ giãn dài | khuyết tật bề mặt | |
|---|---|---|---|---|---|---|---|---|
| HRB | RA | % | DM-F(mm) | DM-T(mm) | EL(%) | |||
| SAPC | Max 95 | Max 40% | Min 90% | Min 8 | Max 0.03 | Max 0.05 | Min. 5% | 전 Size 0.05mm max |
| (A)SIP | Max 100 | |||||||
| PASAIP | Max 93 | |||||||
| Term | Definition |
|---|---|
| Nominal ball diameter (Dw) | The diameter used to identify a ball size. Note: When purchasing balls from the inch system, the diameter values can deviate (see Appendix B). |
| Single diameter of a ball (Dws) | The distance between two parallel planes that contact the surfaces of the ball. |
| Mean diameter of a ball (Dwm) | The arithmetical mean of the largest and the smallest single diameters Dws of a ball. |
| Grade (G) | A specific combination of dimensional, form and surface roughness tolerances and of the diameter variation. A ball grade is designated by a number preceded by the letter symbol G. |
| Ball gauge interval (Ig) | One of the intervals into which the limit deviation for the nominal diameter of a ball is divided. |
| Surface roughness (Ra) | To DIN EN ISO 4287 and DIN EN ISO 4288. The arithmetical average value of the departure of the profile of a surface from the mean line throughout a specified sampling length, with deviations of form and waviness being ignored. |
| Deviation from spherical form (RSW) | The greatest radial distance, in any equatorial plane, between the smallest circumscribed sphere and the greatest inscribed sphere with a common center calculated using the least squares center (LSC) method described in DIN 5401. |
| Variation of ball diameter (VDws) | The difference between the largest and the smallest single diameters Dws of a ball. |
| Lot | A definite quantity of balls manufactured under conditions which are presumed to be uniform and which have comparable properties according to Table 5 (e. g. same ball gauge). |
| Mean diameter of ball lot (DwmL) | The arithmetical mean of the mean diameter of the largest ball and that of the smallest ball in a lot. |
| Variation of ball lot diameter (VdwL) | The difference between the mean diameter of the largest ball and that of the smallest ball in a lot. |
| Ball gauge tolerance (ST) | Range within which DwmL may vary for a particular ball gauge. The amount of ST is equal to the ball gauge interval IG. |
| Distance between the mean ball diameter DwmL of a lot (Ball guage) | Distance between the mean ball diameter DwmL of a lot and the nominal diameter Dw of the ball, rounded to a whole multiple of the ball gauge interval lo (in grade G3 up to G200). |
| Ball Size | Nominal ball diameter |
Ball Size | Nominal ball diameter |
Ball Size | Nominal ball diameter |
|||
|---|---|---|---|---|---|---|---|---|
| Dw | Dw | Dw | ||||||
| mm | inch | (mm) | mm | inch | (mm) | mm | inch | (mm) |
| 5/32” | 12.5mm | 12.5 | 30mm | 30 | ||||
| 4mm | 4 | 1/2" | 12.7 | 1-3/16" | 30.1625 | |||
| 11/64" | 4.36562 | 13mm | 13 | 1-1/4" | 31.75 | |||
| 4.5mm | 4.5mm | 17/32" | 13.49375 | 32mm | 32 | |||
| 3/16" | 4.7625 | 14mm | 14 | 33mm | 33 | |||
| 5mm | 5 | 9/16" | 14.2875 | 1-5/16" | 33.3375 | |||
| 13/64" | 5.15938 | 15mm | 15 | 34mm | 34 | |||
| 5.5mm | 5.5 | 19/32" | 15.08125 | 1-3/8" | 34.925 | |||
| 7/32" | 5.55625 | 5/8" | 15.875 | 35mm | 35 | |||
| 15/64" | 5.95312 | 16mm | 16 | 36mm | 36 | |||
| 6mm | 6 | 21/32" | 16.66875 | 1-7/16" | 36.5125 | |||
| 1/4" | 6.35 | 17mm | 17 | 38mm | 38 | |||
| 6.5mm | 6.5 | 11/16" | 17.4625 | 1-1/2" | 38.1 | |||
| 17/64" | 6.74688 | 18mm | 18 | 1-9/16" | 39.6875 | |||
| 7mm | 7 | 23/32" | 18.25625 | 40mm | 40 | |||
| 9/32" | 7.14375 | 19mm | 19 | 1-5/8" | 41.275 | |||
| 7.5mm | 7.5 | 3/4" | 19.05 | 1-11/16" | 42.8625 | |||
| 19/64" | 7.54062 | 25/32" | 19.84375 | 1-3/4" | 44.45 | |||
| 5/16" | 7.9375 | 20mm | 20 | 45mm | 45 | |||
| 8mm | 8 | 20.5mm | 20.5 | 45mm | 1-13/16" | 46.0375 | ||
| 21/64" | 8.33438 | 13/16" | 20.6375 | 1-7/8" | 47.625 | |||
| 8.5mm | 8.5 | 21mm | 21 | 1-15/16" | 49.2125 | |||
| 11/32" | 8.73125 | 27/32" | 21.43125 | 50mm | 50 | |||
| 9mm | 9 | 22mm | 22 | 2 | 50.8 | |||
| 23/64" | 9.12812 | 7/8" | 22.225 | 2-1/8" | 53.975 | |||
| 9.5mm | 9.5 | 22.5mm | 22.5 | 55mm | 55 | |||
| 3/8" | 9.525 | 23mm | 23 | 2-1/4" | 57.15 | |||
| 25/64" | 9.92188 | 29/32" | 23.01875 | 60mm | 60 | |||
| 10mm | 10 | 15/16" | 23.8125 | 2-3/8" | 60.325 | |||
| 13/32" | 10.31875 | 24mm | 24 | 2-1/2" | 63.5 | |||
| 10.5mm | 10.5 | 31/32" | 24.60625 | 65mm | 65 | |||
| 11mm | 11 | 25mm | 25 | 2-5/8" | 66.675 | |||
| 7/16" | 11.1125 | 11.1125 | 25.4 | 2-3/4" | 69.85 | |||
| 11.5mm | 11.5 | 26mm | 26 | 70mm | 70 | |||
| 29/64" | 11.50938 | 1-1/32" | 26.19375 | 2-7/8" | 73.025 | |||
| 29/64" | 11.90625 | 1-1/16" | 26.9875 | 75mm | 75 | |||
| 12mm | 12 | 28mm | 28 | 3 | 76.2 | |||
| 31/64" | 12.30312 | 1-1/8" | 28.575 | |||||
| Grade | Variation of ball diameter VDWS (Max) | Deviation from spherical form (Max) | Deviation from spherical form (Max) | Variation of ball diameter VDWL (Max) |
|---|---|---|---|---|
| G3 | 0.08 | 0.08 | 0.01 | 0.13 |
| G5 | 0.13 | 0.13 | 0.014 | 0.25 |
| G10 | 0.25 | 0.25 | 0.02 | 0.5 |
| G16 | 0.4 | 0.4 | 0.025 | 0.025 |
| G20 | 0.5 | 0.5 | 0.032 | 1 |
| G24 | 0.6 | 0.6 | 0.04 | 1.2 |
| G28 | 0.7 | 0.7 | 0.05 | 1.4 |
| G40 | 1 | 1 | 0.06 | 2 |
| G60 | 1.5 | 1.5 | 0.08 | 3 |
| G100 | 2.5 | 2.5 | 2.5 | 5 |
| G200 | 5 | 5 | 0.15 | 10 |