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short process of powder metallurgy technology

by:Deyuan      2020-09-14
The powder metallurgy parts technology of near net shape powder metallurgy workers has always been one of the key points of the research topic.
In the past ten years, the research of new technology and new technology has emerged one after another.
The emergence of these new technologies has solved the shortcomings of new technologies. flow low-
The cost of powder metallurgy materials has greatly promoted the rapid development of powder metallurgy parts.
At present, the development of powder metallurgy parts manufacturing technology is to improve the density, reduce the cost,
Precision near the net shape part mouth.
In 2000, the fraunhove Institute in Germany developed a type called low-cost near-
Network technology.
Temperature and Pressure Technology-
Advantages of metal injection molding technology.
By improving the fluidity, filling capacity and shaping of the mixed powder, can 8O ~ 130, precision forming of parts with complex geometry on traditional press, such as vertical direction of grooves with parts such as suppression holes and threaded holes.
No subsequent processing is required.
Flow temperature pressure forming technology not only overcomes the gap of complex geometry in traditional Powder Metallurgy forming, but also avoids the high cost of metal injection molding technology, which is a new technology with great potential, it has a very broad application prospect.
The flow temperature pressure forming is a new type of powder metallurgy part. as a near Net forming technology, its main features can be summarized as: 1)
Using temperature and pressure to form a flow part with complex geometry, you can directly form the groove, hole and screw hole perpendicular to the pressing direction, although it is very difficult or even impossible to use the cold manufacturing shape of this part, the subsequent processing of manganese powder generally needs to be completed, and the CNC press needs to realize complex and accurate movement, only relatively simple type parts can be produced.
Researchers at fraunhove used a special mold. hole, hole, L-
A t-mold hole was studied and successfully prepared. shaped parts.
The results show that well-
Mixed powder flows enough to avoid cracks at corners.
Researchers at frauenhoff also used a slightly tapered shape to successfully guide the punch head to form deep blind hole parts, blind holes and wall thickness up to 3 to 7 times, with a wall thickness of 1 ~ Changes within the 3mm range.
The flow temperature and pressure can also form a threaded hole precisely.
With the outer thread of the bolt with the core mold after compaction, the bolt is removed from half
The finished product, then the wire can be obtained by sintering.
According to the shrinkage, select the appropriate bolt thread core diameter, which can suppress the shrinkage without 2 machining. 2)
The density, temperature and pressure are higher than the powder loading density of uniform flow, so in
The finished product can reach a very high density value through temperature and pressure.
In addition to the density, the powder fluidity is also very good, and the density of the molded parts is more uniform.
Or use a simple red model (
No auxiliary floating redaxis model)can be multi-
Step by step forming of powder metallurgy parts. 3)
The researchers of fraunhove conducted a variety of temperature and pressure studies on the adaptability of the materials, and achieved remarkable results, including low-alloy steel powder (Distolay AE)
Stainless steel, pure Ti powder, WC-
Hard metal powder.
The flow temperature and pressure process apply in principle to all powder systems, and the only requirement is that the powder sintering must be good enough to finally achieve the required density and performance. 4)
In order to simplify the process and reduce the cost, the parts are pressed in the direction perpendicular to the groove, cross hole and other shapes using the traditional powder metallurgy method, need to design a very complex mold or 2 times after the completion of sintering processing.
Although the injection molding technology has almost no restrictions on the shape of the molded complex parts.
However, due to the heavy addition of the adhesive, the nickel powder is partially deformed during heating due to the influence of gravity.
Therefore, it often requires an additional more complex and expensive adhesive removal process, making injection molding more costly than traditional powder metallurgy technology, and therefore, the injection molding of parts may not meet its design features and can not replace the traditional Powder Metallurgy parts, thus limiting the application of injection molding technology.
Flow temperature and pressure formation techniques do not require complex geometry or subsequent processing;
On the other hand, in the process of flow temperature and pressure formation, the use of special adhesive and lubricant content is moderate, the configuration of the mixed powder has high viscosity and critical shear strength, no heating process occurs during deformation, can be removed directly during the sintering adhesive process.
Therefore, the traditional powder forming process and injection forming process not only simplify the production process, but also significantly reduce the manufacturing cost compared with the current warm pressure forming process of complex geometry parts.
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