A kind of powder metallurgy special-shaped gear and preparation method thereof
A special-shaped gear and powder metallurgy technology, which is applied in the field of powder metallurgy, can solve problems such as poor mechanical properties, uneven overall density of parts, and uneven density of green bodies, so as to improve material utilization and productivity, and increase self-lubrication Uniform performance and density
Active Publication Date: 2015-11-25
ANHUI HENGJUN POWDER METALLURGY TECH
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Problems solved by technology
However, in the existing powder metallurgy parts, due to the different proportions of various raw materials in the formula, it is difficult to ensure uniform mixing during mixing, resulting in uneven density of the pressed green body. After heat treatment, the overall density of the obtained parts is uneven. lead to poor mechanical properties
Method used
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Embodiment
[0020] Examples Weigh the following raw materials (kg): iron powder 100, copper powder 1.9, molybdenum powder 0.6, vanadium powder 0.2, nickel powder 1.0, graphite powder 0.7, modified tree ash 0.2, rare earth ferrosilicon alloy 0.5, Cr powder 0.2, ethylene Bis stearic acid amide 0.15, silicon powder 0.2, yttrium powder 0.3, boron nitride 0.3, molybdenum sulfide 0.45, the grade of the rare earth ferrosilicon alloy is FeSiRE23, particle size 5-20mm,
[0021] The preparation method comprises the following steps:
[0022] (1) First put 40-50% of the base iron powder into the high-speed mixer, add silane coupling agent KH-550 with a mass of 0.3-0.6% of the base iron powder, stir at high speed for 5-6 minutes, and then Add copper powder, molybdenum powder, vanadium powder, nickel powder, graphite powder, modified tree ash powder, Cr powder, ethylene bis stearic acid amide and the rest of the iron powder in turn, and heat while mixing at high speed. When it reaches 125-130°C, add a...
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Abstract
The invention provides a powder metallurgy special-shaped gear which is prepared by pressing the following raw powder materials in parts by weight: 100 parts of ferrous powder, 1.8-2.0 parts of copper powder, 0.5-0.8 parts of molybdenum powder, 0.1-0.3 parts of vanadium powder, 0.8-1.2 parts of nickel powder, 0.5-0.8 parts of graphite powder, 0.1-0.3 parts of modified wood ash, 0.2-0.6 parts of rare earth ferrosilicon alloy, 0.1-0.3 parts of Cr powder, 0.1-0.2 parts of ethylene bis stearamide, 0.1-0.3 parts of silicon powder, 0.2-0.4 parts of yttrium powder, 0.2-0.4 parts of boron nitride and 0.4-0.5 parts of molybdenum sulfide. During preparation, the raw powder materials are mixed step by step, then pressed, sintered, and subjected to heat treatment and surface treatment to form a finished special-shaped gear. The produced powder metallurgy special-shaped gear has the characteristics that the powder metallurgy duplicate gear is good in abrasive resistance, high in strength, high in hardness, good in machinability, long in service life, corrosion-resistant, and not easy to break.
Description
technical field [0001] The invention relates to the field of powder metallurgy, in particular to a powder metallurgy special-shaped gear and a preparation method thereof. Background technique [0002] Powder metallurgy technology can produce parts requiring high dimensional accuracy and complex shapes in a shape very similar to the shape of the product, which can greatly reduce cutting costs. Therefore, powder metallurgy products are used in various fields as parts of various machines and devices. [0003] In general, iron-based powder mixed powder is formed by mixing alloy powder such as graphite powder and lubricant powder such as stearic acid and Cr powder with iron-based powder, and then the iron-based powder mixed powder is filled into a metal mold, Press molding to manufacture iron-based powder compacts (compact powders) for powder metallurgy. Among them, the iron-based powder can be divided into iron powder (pure iron powder, etc.), alloy steel powder, etc. accordin...
Claims
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IPC IPC(8): B22F1/00B22F5/08
Inventor 丁邦顺
Owner ANHUI HENGJUN POWDER METALLURGY TECH