Technology And Process Of Temperature Molding For Metal Powder
When there is no lubricant in the metal powder
, flow of the powder is 26.5s/50g. If the metal powder lubricant is increased to 0.3%, the powders flowability reaches to a minimums value of 25.3s/50g. At this time, powder has best flow properties. Lubricant content in the powder has a greater impact on bulk density. The bulk density is 2.99g/cm3 in lubricant which does not contain the powder. As the lubricant is increased to 0.3%, the bulk density is significantly increased, and reached the maximum to 3.38g/cm3 at 0.3%. If continue to improve the lubrication agent content to 0.7% in the metal powder, bulk density decreases slowly to 3.31g/cm3.
Lubricants in the metal powder on the fluidity and bulk density from the following two aspects to understand: First, the right amount of lubricant to make a number of powder single-particle bonding and the formation of multi-particle complex, thereby increasing the powder flow and bulk density; Second, too much lubricant / binder content of the bonding between the powder particles was evident in the formation of a large number of loose powder system arch structure. The above two factors make the powder in the lubricant content of 0.3% shows the best fluidity and bulk density. Overall, 00.7% lubricant content within the powder flowability and bulk density were able to meet the use requirements in the production of industrial automation.
It is noteworthy that, in the range of 0.1% to 0.3% lubricant content, changes in its content to suppress the effect of no significant effect, which enhances the practical application of industrial production, part design flexibility, the production of high-diameter ratio of large parts the right amount can improve the content of the powder in the lubricant in order to improve the density distribution in the direction of parts under pressure, but also from the lower mold release the pressure; more of powder metallurgy parts for the density appropriate to reduce the content of the powder in the lubricant. improve the density of the compacts without holes, and at a higher pressure, higher green density.
Add lubricant, the use of commercial atomized iron powder mixture prepared in the conventional repression and mold heating suppress mode, basically can reach the normal temperature and pressure the density of the process indicators. The conventional suppress process suitable for preparing density iron base powder metallurgy materials 7.207.30g/cm3; temperature mold is suitable for the high-density iron-based powder metallurgy materials in the preparation of density for 7.357.45g/cm3.
Overall, the temperature of the mold is mold release pressure slightly greater than the conventional suppress the stripping pressure, which is due to heating the molding process, mold under the same pressure the green density than conventional repression process, compacts in the ejection flexibility, the aftereffect is large. Powder lubricant, mold release pressure of the two kinds of processes is 60MPa and 63MPa. When powder lubricant content increased to 0.1%, mold release, the pressure reduced to 39MPa and 42MPa respectively; and lubricant levels increased 0.5% to 0.7%, the lower mold release pressure, and its size is 1623MPa. lubricant content increases the demoulding pressure to reduce the phenomenon to understand the following two aspects: First, the lubricant content increases, compacts the hole density reduced, the actual pressure the green density will be reduced, the corresponding elastic aftereffect; Second, the increase in lubricant content, is more conducive to the formation of lubricant film, reducing the sliding frictional resistance between the powder and the mold in molding wall.
When there are no lubricants in boron powder, mold release pressure of the two kinds of processes are respectively 54MPa and 56MPa. If the lubricant content is 0.1%, mold release pressure is 34MPa and 35MPa. But if the lubricant content reaches to 0.5% to 0.7%, mold release pressure is reduced to 1826MPa. In the same repression conditions, mold release pressure by powder annealed is lower than the unannealed powder, which is due to the annealing of powder plastic deformation ability. The powder without annealing is more difficult to suppress. The powder stored high energy by the suppression. It makes the springback for pressure blank and the demoulding pressure increases.Source:http://www.mhcmp.com
by: anelwew
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