Ti-6A1-4V Metal Injection Molding MIM Parts

The Ti6Al4V alloy injection molding method can directly prepare titanium alloy parts with final shape and high dimensional accuracy at low cost, making this material widely used.

The present invention uses powder injection molding technology to prepare titanium alloy preforms, and then prepares titanium alloy through degreasing and sintering.

The Specific Process Is:

1. Mix the selected Ti6Al4V powder and the prepared binder in proportion on the SK-160 open rubber mixing machine for 1.5 to 2 hours, and then granulate on the PSJ32 mixing extruder to make the feed For further uniformity, the powder loading is 68 to 72 vol%.

2. After granulation, injection molding is performed at an injection temperature of 120°C to 140°C and an injection pressure of 70MPa to 90MPa to obtain a titanium alloy preform of the required shape.

3. Then perform solvent degreasing in a mixed solvent of absolute ethanol and trichlorethylene with a volume ratio of =1.5~2:7.5~8 at 50℃~80℃ for 1~3 hours, and dry at a temperature of 40℃~60℃ for 30 ~60 minutes, vacuum thermal degreasing is carried out between room temperature and 600°C, and the time is 6 to 8 hours.

4. Place the degreased billet in a vacuum sintering furnace of 10-3Pa at 1230°C to 1260°C for vacuum sintering for 2 to 4 hours to obtain a denser Ti6Al4V alloy. Heat the sintered billet at 920°C to 950°C and 100 to 140MPa. After static pressure treatment for 2 to 4 hours, followed by annealing at a temperature of 720°C to 760°C for 1 to 2 hours, Ti6Al4V parts with good comprehensive mechanical properties and an accuracy of up to ±0.2% can be obtained.

The Ti6Al4V powder selected by Zhongwei Precision and University Research Laboratory is a powder with a ratio of hydrogenated-dehydrogenated Ti6Al4V: gas atomized Ti6Al4V of 1:9 in weight percentage.

The particle size of Ti6Al4V powder is 25~80μm.

The binder prepared by Zhongwei Precision and University Research Laboratory is composed of 60 to 65% modified paraffin (PW), 12 to 16% low density polyethylene (LDPE), and 8 to 12% polypropylene (PP) by weight. , a multi-polymer component adhesive composed of 10-15% polyethylene glycol 20000 (PEG20000) and 0-5% stearic acid (SA), among which the modified paraffin (PW)-based adhesive system, Low density polyethylene (LDPE), polypropylene (PP), polyethylene glycol 20000 (PEG20000) are used as plasticizers, and stearic acid (SA) is used as surfactant.

The advantage of Zhongwei Precision and University Research Laboratory is that the mechanical properties of Ti6Al4V parts have reached the level of traditional powder metallurgy (tensile strength 1020MPa-1060MPa, yield strength 880MPa-970MPa, elongation 8.0%-9.5%, and area shrinkage 9.0%-12.0 %). Parts have high dimensional accuracy.

Qinhuangdao Zhongwei Precision Mechanical Parts Co., Ltd. mainly produces various titanium alloy, copper-based, iron-based, stainless steel-based pressed powder metallurgy products and various injection molded powder metallurgy products. The company has more than 60 sets of main production equipment and more than 20 fully automatic powder metallurgy rolling mills ranging from 6 tons to 630 tons. Two sets of powder metallurgy injection molding production lines are equipped with advanced sintering and degreasing integrated vacuum furnaces. The company has a supporting heat treatment workshop to ensure the heat treatment quality of the factory's powder metallurgy parts. It has fully automatic vacuum furnaces, mesh belt furnaces, carburizing furnaces, high-frequency furnaces and other equipment to ensure that it can provide customers with various high-strength powder metallurgy structural parts.

The company's products are widely used in textile machinery, power tools, engine parts, automobile and motorcycle parts, household appliances, hardware tools, woodworking machinery, printing machinery and other industries. The products are exported to Japan, the United States, Germany, the United Kingdom and other countries