Silicon bronze bar and preparation method thereof

Abstract

The invention discloses a silicon bronze bar. The silicon bronze bar is characterized in that silicon bronze is prepared from, by mass, 2.0 wt% to 3.5 wt% of Si, 1.0 wt% to 1.5 wt% of Mn, 0.2 wt% to 0.8 wt% of Zn, 0.1 wt% to 0.5 wt% of Ni, 0.1 wt% to 0.3 wt% of Cr, 0.1 wt% to 0.5 wt% of Co and the balance Cu and inevitable impurities. According to the silicon bronze bar, QSi3-1 is subjected to component design, trace elements are added, physical properties of materials are changed, the comprehensive properties that the tensile strength is 470MPa or above, the elongation is 19% or above, the hardness is 180HB or above and the friction coefficient is 0.013 or below when the bar specification is phi 12mm or above are met, and the use of parts such as worms, worm wheels, shaft sleeves, brake pins and rods is met.

Description

technical field [0001] The invention belongs to the technical field of copper alloys, and in particular relates to a silicon bronze rod and a preparation method thereof. Background technique [0002] Silicon bronze QSi3-1 has high strength, elasticity and wear resistance, good corrosion resistance, good plasticity, and is not brittle at low temperature. In view of its special physical properties, it is suitable for production in corrosive media Various springs and spring parts for work, as well as wear-resistant parts such as worms, worm gears, bushings, brake pins and rods, can also be used to make parts in welded structures, which can replace important tin bronze, and even replace low beryllium Beryllium bronze. [0003] For components such as worms, worm gears, bushings, brake pins, and rods, the operating environment is relatively harsh, generally in oily environments and high-temperature environments. While meeting a certain strength, because they need to be used for t...

AI Technical Summary

Problems solved by technology

[0004] For traditional copper alloy rods, as the diameter of the rod decreases, the strength of the rod is greatly improved due to the strengthening effect of work hardening during the drawing process, but the shape is seriously deteriorated, and it is difficult to achieve strength and shape The same is true for silicon bronze QSi3-1 rods

For parts such as worms, worm gears, bushings, brake pins, and rods, the use specifications of the rods are generally above Φ12mm. For silicon bronze QSi3-1 above Φ12mm, because of the small work hardening, Therefore, the plasticity of the bar is relatively high, above 19%, but the tensile strength is below 470MPa, the hardness is below 180HB, and the friction performance is poor. use of class parts

[0005] At present, the production of QSi3-1 has extrusion process and continuous casting process, but the mainstream is produced by horizontal continuous casting process. The production process is casting billet, after multi-channel drawing and intermediate annealing, and finally straightening to get the product, horizontal continuous casting The existing bar blanks within Φ12mm can meet the mechanical properties used in the production process, but for the bar blanks with specifications above Φ12mm, which are used to make worms and pins, the tensile strength should be above 470MPa and the elongation should be above 19% ( The national standard GB / T 4423-2007) cannot meet the requirements of mechanical properties. Therefore, in view of this problem, an improvement to the silicon bronze rod and its preparation method is proposed.

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