A powder metallurgy bevel gear and its preparation method
A powder metallurgy and bevel gear technology, applied in the field of powder metallurgy bevel gears and its preparation, can solve the problems of uneven overall density of parts, uneven green density, poor mechanical properties, etc., to improve material utilization and Productivity, uniform density, increased self-lubricating properties
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, antimony powder 0.6, cobalt powder 0.2, chromium powder 1.0, graphite powder 0.7, modified tree ash 0.2, rare earth ferrosilicon alloy 0.5, paraffin wax 0.2, ethylene bismuth Stearic acid amide 0.15, tricalcium phosphate 0.2, yttrium powder 0.3, boron nitride 0.3, zinc oxide 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, antimony powder, cobalt powder, chromium powder, graphite powder, modified tree ash powder, paraffin wax, ethylene bis stearic acid amide and the rest of the iron powder in turn, and heat while mixing at high speed. When the temperature rises to...
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Abstract
The invention provides a powder metallurgy bevel gear which is formed by compressing the following power stocks in part by weight: 100 parts of iron powder, 1.8 to 2.0 part of copper powder, 0.5 to 0.8 part of antimony powder, 0.1 to 0.3 part of cobalt powder, 0.8 to 1.2 part of chromium powder, 0.5 to 0.8 part of graphite powder, 0.1 to 0.3 part of modified wood ash, 0.2 to 0.6 part of rare earth ferrosilicon alloy, 0.1 to 0.3 part of paraffin, 0.1 to 0.2 part of ethylene bis stearamide, 0.1 to 0.3 part of tertiary calcium phosphate, 0.2 to 0.4 part of yttrium podwer, 0.2 to 0.4 part of boron nitride, and 0.4 to 0.5 part of zinc oxide. When in preparation, mixing the powder stocks stepwise firstly, and obtaining the finished product bevel gear through compressing and manufacturing, sintering, heat treatment and surface treatment. The produced powder metallurgy bevel gear has the advantages that the bevel gear is good in abrasion resistance, high in strength and rigidity, good in machinability, is corrosion resistant and less susceptible to breakage, and has a long service life.
Description
technical field [0001] The invention relates to the field of powder metallurgy, in particular to a powder metallurgy bevel 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] Generally speaking, after mixing powders for alloys such as graphite powder and lubricant powders such as stearic acid and paraffin into iron-based powders to form iron-based powder mixed powders, the iron-based powder mixed powders are filled in metal molds, and 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. accord...
Claims
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IPC IPC(8): B22F1/00B22F5/08
Inventor 丁邦顺
Owner ANHUI HENGJUN POWDER METALLURGY TECH