The starting point of powder metallurgical flow warm pressing technology
| In the process of understanding powder metallurgy technology, we were exposed to the metal powder injection molding process. I did not expect that it is completely different from ordinary molding technology. There must be no difficulty in mass-producing parts with complex geometries, high performance, and high precision. In order to promote breakthroughs in the industrialization of powder machining enterprises. |
When powder metallurgy enterprises perform metal powder injection molding, in addition to preparing the corresponding powder required for processing, they also need to add more binders to the powder. Therefore, both powder and binder should meet the requirements, otherwise it will affect the forming of powder metallurgy products.
Among them, the powder needs to use ultra-fine near-spherical powder ≤ 10um, and from mixing to degreasing and sintering, the process is more complicated and the process requirements are strict, especially the longer degreasing and sintering time, which also causes the manufacturing cost of powder metallurgy enterprises to be partial The main reason for the high. The adhesive wolf must be sufficient, otherwise it is difficult to achieve the corresponding performance.
In this regard, a simplified method developed by the powder metallurgy enterprise is the flow warm pressing technology, which is based on the metal powder warm pressing and combines the advantages of the metal powder injection molding process; then by adding an appropriate amount of coarse powder and fine Powder, and increasing the content of thermoplastic lubricants, thereby greatly improving the flowability, filling properties and formability of the mixed powder.
Because the mixed powder becomes a viscous fluid with good fluidity during pressing, it not only has the advantages of a liquid, but also has a high viscosity and reduces friction. Only then can the pressing pressure be evenly distributed in the powder. Got a good pass. Because of this, the powder can flow to all corners without cracks during the pressing process, thereby greatly improving the density.
At present, powder metallurgy companies have promoted this technology for precision forming of workpieces with very complex shapes on traditional tablet presses, which not only overcomes the disadvantages of traditional cold pressing in forming complex geometries, but also avoids the high level of injection molding technology.
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