07 Selection of fine materials for molding
1 . Selection principle
It is important to meet the functional requirements of finely finished parts while also considering cost-benefit. This involves considering factors such as material type and availability, dimensional tolerances, surface quality and the level of difficulty in obtaining an accurate cut.
two . Variety of materials
Ferrous metals include: mild steel (C≤0.13%); non-alloy steel (0.12-1.0%C); alloy steel (0.15-0.20%C); stainless steel (C≤0.15%); fine grain steel (0.10-0.22%C).
Non-ferrous metals include: copper and copper alloys; aluminum and aluminum alloy.
Related Reading: Ferrous vs Non-Ferrous Metals
3. Offer status
For steel requirements:
- Supply types: hot-rolled strip, cold-rolled strip, flat bar, but in different states, it has annealed, soften annealed, spheroidal annealed, etc.
- Size: is determined by the die design.
- Thickness tolerance: Must be consistent with the parts.
- Surface quality: Different lamination methods allow you to obtain different surface qualities, such as pickling, sandblasting, pickling, cold lamination, etc.
- Metallographic organization: according to the requirements of the product parts, it is divided into three levels:
FSG I: Maximum tensile strength, without requirement from the metallurgical organization.
FSG II: after annealing treatment, material C>0.15%, containing about 80-90% spherical carburizing bodies.
FSGIII: Softened and annealed, material C>0.15%, containing approximately 100% spherical carburizing body.
For non-ferrous metals, copper, aluminum and their alloys have requirements for chemical composition and rolling state.
4 . Fine Suppression Assessment
The evaluation of fine cutting materials and their selection is shown in Table 5.
| Steel Grade | Maximum suppression thickness | Fine blanking performance evaluation | ||||
| China (YB) | USA (AISI) | Germany (DIN) | Japan (JIS) | Soviet Union (rOCT) | ||
| 08 | 1008 | 15 | 1 | |||
| 10 | 1010 | C10 | S10C | #10 | 15 | 1 |
| 15 | 1015 | C15 | S15C | #15 | 12 | 1 |
| 20 | 1020 | C22 | S20C | #20 | 10 | 1 |
| 25 | 1025 | S25C | #25 | 10 | 1 | |
| 30 | 1030 | S30C | #30 | 10 | 1 | |
| 35 | 1035 | C35 | S35C | #35 | 8 | two |
| 40 | 1040 | S40C | #40 | 7 | two | |
| 45 | 1045 | C45 | S45C | #45 | 7 | two |
| 50 | 1050 | CK53 | S50C | #50 | 6 | two |
| 55 | 1055 | Cf56 | S55C | #55 | 6 | two |
| 60 | 1060 | C60 | SWRH4B | #60 | 5 | two |
| 1064 | CK60 | S58C | 6 | |||
| 65 | 1065 | CK67 | SUP2 | #65 | 3 | |
| 70 | 1070 | 3 | two | |||
| 1074 | C75 | 3 | ||||
| T8A | C85W2 | SKU3 | Y8A | 3 | ||
| T10A | W1-0.8C | 3 | 3 | |||
| 15Mn/16Mn | 8 | 3 | ||||
| 15CrMn | 16MnCr5 | 15XI | 5 | two | ||
| 14Ni6 | 8 | two | ||||
| 14NiCr10 | SNC21H | 7 | ||||
| E3316 | 14NiCr14 | SNC22H | 7 | |||
| 14NiCr18 | 7 | |||||
| 15CrNi6 | 6 | |||||
| 18CrNi8 | 5 | |||||
| 4317 | 17CrNiMo6 | 5 | ||||
| 15 cr | 15Cr3 | SCr21 | 15X | 5 | two | |
| 15CrMo5 | 4 | |||||
| 20CrMo | 4118 | 20CrMo5 | SCM22 | 20XM | 4 | two |
| 20CrMo | 20MnCr5 | 4.5 | two | |||
| 20MnMo | 8 | two | ||||
| 42Mn2V | 42MnV7 | 6 | two | |||
| GCr15 | E52100 | 100Cr6 | SUJZ | IIIX15 | 6 | 3 |
| 0Cr13 | 410 | X7Cr13 | ||||
| 1Ch13 | 403 | X10Cr13 | SUS21 | 1X13 | ||
| 4Ch13 | X40Cr13 | 4X13 | ||||
| Cr17 | 430 | X8Cr17 | SUS24 | X17 | ||
| 0Cr18Ni9 | 304L | X5CrNi189 | SUS27 | 0X18H9 | ||
| 1Cr18Ni9 | 302 | X12CrNi188 | SUS40 | 1X18H9 | ||
| 1Cr18Ni9Ti | 321 | X10CrNiTi189 | SUS29 | 1X18H9T | ||
| 304L | X2Crni189 | SUS28CP | ||||
| X8CrNi1212 | ||||||
| 301 | X12CrNi177 | SUS39CP | ||||
| X2NiCr1816 | ||||||
Grades:
- Very good, ideal fine cutting material with high cutting surface fineness and long die life.
- Suitable fine cutting material, with cutting surface smoothness and normal die life.
- Quite good cutting material – not very thin, when used for complicated shaped parts, the cutting surface is torn and the die life is short.
