A method of manufacturing hollow parts of magnesium alloys

 

(57) Abstract:

The invention relates to the processing of metals by pressure and can be used in the manufacture of parts made of magnesium alloys by hot deformation. A method of manufacturing hollow parts of magnesium alloys involves the extrusion of a tubular preform and forming it thickened part by hot crimping when the temperature of the container 300 to 400^oC and strain rate of 0.5-5.0 s^-1. The technical result of the invention is to increase productivity.

The present invention relates to the field of metal forming and can be used in the manufacture of parts made of magnesium alloys by hot deformation.

A known method of manufacturing hollow parts with thickened ends of magnesium alloys, including extrusion billets and turning it on the external side, leaving the ending (Abebaw A. L. et al. M: mechanical engineering, 1970, S. 182).

The disadvantages of this method are the inability to obtain a smooth outer surface, low labour productivity and low utilization of metal (KIM).

Features SPO who use it thickened part by hot crimping when the temperature of the container 300 to 400^oC and strain rate of 0.5-5.0 s^-1.

The proposed method differs from the prototype in that the formation of the thickened part carried out by hot crimping when the temperature of the container 300 to 400^oC and strain rate of 0.5 - 5.0 s^-1.

The technical result is to increase the productivity and KIM.

The proposed method provides receiving hollow parts with a tip by hot crimping with the exception of machining, which increases productivity and KIM.

The process for modes below leads to the loss of stability of a tubular piece swaging, which allows to obtain a product of the desired geometry.

The process according to the above modes offer leads to the loss of stability of billets that do not allow to obtain details from tubular blanks.

Examples of the method

For the manufacture of stretch marks received billet magnesium alloy MA-1. The ingot 90 mm was heated at 380^oC for 20 min and then extruded tubular workpiece 30 x 2 mm Billet crimp in the container at a temperature of 280, 300, 350, 400 and 420^oC IMM. For the manufacture of each part took 0.16 hours (part time and KIM was equal to 0,95).

Hollow parts - stretch - failed to get the regimes below and above offer, because the tubular workpiece loses its stability and getting the details of the required geometry is not possible.

The same marks were made by a known method prototype. To do this, the ingot of magnesium alloy MA-1 with a diameter of 90 mm was heated for 20 min and then extruded tubular workpiece 30 x 7.5 mm Billet was rustichelli on a lathe to the inner diameter of 26 mm and education zaranzowany part with an inner diameter of 15 mm, For the manufacture of each part took 0.30 hours/part time and KIM was $ 0,30.

The proposed method allows to increase productivity more than doubled and KIM more than three times.

A method of manufacturing hollow parts with a tip of magnesium alloys, including the extrusion of a tubular preform and forming it thickened portion, wherein forming the thickened parts are by hot crimping when the temperature of the container 300 - 400^oC and strain rate of 0.5 - 5.0 s^-1.