CH239996A - Aluminum alloy, suitable for bar turning and stamping. - Google Patents

Description

  

  Aluminum alloy, suitable for bar turning and stamping. An aluminum alloy suitable for peeling must have, as is known, the following properties: Easy machining with or without lubricant, Formation: fine chips easily removed from the nose of the tool, Possibility: of working on an automatic lathe and in particular at high working speeds, Smooth and shiny machining surface of the parts, Possibility of chemical or electrolytic oxidation: of this surface, and of galvanic coating.



  In certain cases, it is also advantageous that such an alloy lends itself very easily to forging, stamping, -estam page operations, normally used for the manufacture: of a very large number of parts.



  The present invention relates to an aluminum alloy containing, besides aluminum, in addition to the usual impurities of this metal, from 0.10 to <B> 570 </B>: of silicon and from 0.05 to 3% magnesium, and bringing together all the properties. listed above.



       This alloy may also contain from 0.3 to 4%. Of one of the following metals: lead, tin, bismuth, cadmium, thallium, to -increase the fineness of the machining chips:



  It may even possibly contain several of these metals at the same time, with a total content of between the same limits of 0.3 to 4%.



  Properties; General information of the alloy can be improved by the known additions to refine the grain, these additions, the total rate of which must "be less than 2%, can comprise one or more of the following metals Ti, V, Mo, Mn, Cr, Zr, W.

      To increase the mechanical characteristics, while retaining the other properties mentioned, it is also possible to add metals known to produce, within the metal, compounds: hardeners,: that is to say which improve the mechanical characteristics . especially after heat treatment.

      These metals can be: Cu up to, <B> 6%, </B> Ni 4 Zn 1 ()%. The additions of Pb, Bi, Sn, Cd. T1 can be made by any known methods: direct addition of these metals, either pure or alloyed together, addition by parent alloy containing aluminum and one or more of the metals. addition metals, addition by chemical reaction, the salts of the metals to be added being; paid to the. bath surface of molten aluminum or alloys.



  The other additions (refining, hardening) are made by one or the other of the known processes and in particular by those enu merited above.



  The alloy can be used depending on the case, either as a foundry alloy, that is to say in the cast state, or as a forging alloy, that is to say after mechanical transformation such as: forging, stamping , lamination, etc. The bonding in the transformed state can be used cold or annealed. Whether it is in, the cast state or the transformed state, it can undergo a heat treatment of homogenization (heating between 450 and 50 from 30 'to 1 () h.). Followed either by a simple aging at room temperature.

    or a higher temperature tempering which can range up to 300 and of a variable duration depending on the temperature used e1, the desired characteristics.



  By way of nonlimiting example illustrating the. present invention. and for the simple purpose of making it understandable, we can cite the following composition: Fe = I), 20, ô Si = 1.45% <B> Mg- </B> = 1.04 Pb = 2 , 56 Al = the remainder.



  Such an alloy gives on extruded bars .; when it has undergone a quenching treatment with water after heating to 550, followed by a come to 175: Yield strength: L. E. = 21 kg / mm2; Tensile strength: R = 30.5 kg / mm '.



  Elongation at break: A = 19%. Under normal machining conditions, this. alloy gives shavings identical to ce1 (x free-cutting brass.

 

Claims (1)

CLAIM: Aluminum alloy containing, in addition to the usual aluminum impurities, from 0.1 to. 5% silicon and 0.05 to, 3% magnesium and having the following properties: Easy machining, with or without lubricant, Formation of fine chips easily removed from the nose of the tool, which allows it to be worked on a. automatic lathe, Possibility of working by forging, stamping and stamping, Possibility of working on an automatic lathe: (high working speeds, machining surface of the parts smooth and shiny, Possibility of chemical or electrical oxidation of this surface and of galvanic coating. SUB-CLAIMS: 1. Alloy according to claim, nothing - additionally closing from 0.3 to 4% & lead 2. Alloy according to claim, additionally containing 0.3 to 4% tin. 3. An alloy according to claim, further containing from 0.3 to 4% bismuth. 4. Alloy according to claim, including; additionally 0.3 to 4% cadmium. 5. The alloy of claim, further containing 0.3 to 4% thallium. .