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The finishing of magnesium alloy forgings

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Update time : 2023-02-28 16:29:37

After forming, solution treatment and quenching, magnesium alloy castings and forgings have more or less residual stress and deformation, the size and shape accuracy may not meet the standard requirements, and there will be residual lubricants, ash, oxide skin, sprue, flying edge, rough edge, etc., so it should be finished.

The finishing of castings

There are always excess metals remaining on magnesium alloy die-casting parts and castings, such as process residual blocks, flying edges, leaky passage caking, spills, exhaust holes and non-metallic slag, etc., which are generally cleaned by dressing molds. Dressing is often combined with drilling, trimming and other processes, and has a certain corrective effect. Usually, the precision of finishing die determines the quality and size of finished product. If the workpiece is deformed during the heat treatment of T4 and T6, it also needs straightening or machining correction.

machining

Some die castings are net formed and require no further work after finishing, while others require mechanical finishes such as vibration, ultrasonic, or shot peening to improve the surface quality. For some castings with strict deviation and good repeatability, high precision secondary machining is needed.

Surface treatment

The corrosion resistance of magnesium alloys is poor, so surface treatment, such as anodic oxidation, passivation, spraying or shot peening, should be applied to castings and die castings. Grinding, polishing and other finishing processes can also be performed to improve surface quality and condition and improve corrosion resistance.

The finishing of the forging.

Trimming and shaping

Cutting and shaping is an indispensable process in the production of magnesium alloy forging. Cracks should be carefully controlled during cutting. Magnesium alloy has low plasticity when it is lower than 220C, is very sensitive to tensile stress, weak at high temperature, large viscosity, easy to pull, so it is easy to crack during edge cutting. The rough edges are usually cut cold with a band saw, but can also be cold milled or heated with a cutting die.

Cutting edge with band saw or cold milling is suitable for producing small batch, simple shape or large size forgings, will not produce split edge, can eliminate cutting die.

When cutting burrs hot with press, occlusal mold can be used to reduce the gap or no gap between the convex and concave dies as far as possible, so as to avoid cutting edge cracks. The cutting temperature is 200℃~300℃. Mold edge cutting advantages: low labor intensity, safer work, high cutting quality, high production efficiency, but the price of the mold is high, the use of more than specific, a mold a forging, but also easy to produce rough edge cracks.

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