Powder metal composition for easy machinability
一种组合物、粉末的技术，应用在阀座插件,切削性的粉末金属部件领域
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Embodiment 1
[0073] available through mixing from Pure atomized iron powder ASC100.29 from AB, Sweden, 2% by weight of copper powder Cu165 available from ACuPowder, USA, 0.85% by weight of graphite powder Gr1651 available from Asbury Graphite, USA, and 0.75% by weight of Five iron-based powder compositions were prepared from the lubricant Acrawax C available from Lonza, USA. Mixture No. 1 was used as a reference and did not contain any machinability-improving substances, while mixtures No. 2-5 contained 0.15% by weight of the machinability-improving agent according to the invention.
[0074] These mixtures were pressed into transverse rupture strength (TRS) samples according to SS-ISO 3325 to achieve a green density of 6.8 g / cm 3 , and then sintered at 1120°C for 30 minutes in a 90% nitrogen / 10% hydrogen atmosphere. After cooling to ambient temperature, the samples were tested for transverse rupture strength according to SS-ISO 3325 and hardness (HRB) according to SS-EN ISO 6506. The d...
Embodiment 2
[0084]The following examples show the effect of the particle size of the machinability improver potassium titanate on machinability. An iron-based powder composition similar to that described in Example 1 was prepared except that potassium titanate with a different particle size distribution was used. Sintered samples according to Example 1 were prepared and similar drilling experiments were carried out as described in Example 1 . Table 5 below shows cutting parameters and results.
[0085] Table 5. Cutting parameters and results of machinability experiments
[0086]
[0087] *This experiment was stopped when the cutter was not broken
[0088] For mixture No. 7-9, cutting tool failure did not occur even after cutting 3240 mm; for mixture No. 10, cutting tool failure occurred after a cutting distance of 954 mm, which is different from the mixture No. 6 is also a huge improvement over the results obtained. figure 1 Shows the cutting edge wear of the drill before and after...
Embodiment 3
[0090] The following examples show the comparison in effect of the machinability improver of the present invention with known agents. In the iron-based powder composition for comparison, the following known machinability improvers were used: calcium fluoride powder having a particle size distribution of X95=9 μm in mixture No. 12; and in mixture No. 13 Manganese sulfide powder, MnS, having a particle size distribution of X95 = 10 μm was used. Mixture Nos. 14-16, 16a and 16b contained the same machinability improver of the present invention as described for Mixture No. 7 of Example 2. Iron-based powder compositions and experimental samples were prepared as described in Example 1. Machinability experiments were performed as described in Example 1, except that a TiN-coated high speed steel drill was used, the diameter of the drill was 1 / 8 inch, and the holes were drilled to a depth of 10 mm in dry conditions, i.e. without coolant.
[0091] Table 6 below shows machinability imp...
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Abstract
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