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Iron based powder for powder metallurgy

A technology of powder metallurgy and mixed powder, which is applied in the field of iron-based powder mixed powder for powder metallurgy, and can solve the problems of increased manufacturing costs and other issues

Active Publication Date: 2005-07-27
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this technology, since a special device is required, the manufacturing cost increases

Method used

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  • Iron based powder for powder metallurgy
  • Iron based powder for powder metallurgy
  • Iron based powder for powder metallurgy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0159] To No.1-No.4 powdered iron powders shown in Table 1, iron powders (a) to (g) with different types and particle sizes shown in Table 1 were added in the mixing amounts shown in Table 1. , stirring and mixing to make a mixed powder. Then, in this mixed powder, a heat treatment is carried out to make the copper powder partially alloyed and adhered, and then pulverized and classified, and then, powdered iron powder (powdered iron powder with copper partially alloyed and adhered) No. 1 to No. 7 , which has the particle size distribution and apparent density shown in Table 2, and the copper powder is partially alloyed and adhered to the surface. In addition, the particle size distribution adopted the sieve distribution method prescribed|regulated by Japan Powder Metallurgy Industry Association standard JPMA P02-1992. The apparent density was measured in accordance with JPMA P06-1992, Japan Powder Metallurgy Association standard.

[0160] Partial alloying and adhesion heat t...

Embodiment 2

[0210] 990 g of iron-based powder shown in Table 4, 10 g of graphite powder (average particle diameter: 23 μm), and binders of the type and amount shown in Table 9 were charged into the heating mixer, stirred and mixed thoroughly, and then continued to stir. , heated to the primary mixing heating temperature shown in Table 8, and primary mixing was performed.

[0211] Next, the primary mixture was cooled to below 85°C while stirring. After cooling to 40° C., lubricants of the type and amount shown in Table 9 that form free lubricants were added, and secondary mixing was performed to make them uniform, and then discharged from the heating mixer to obtain iron-based mixed powder.

[0212] In addition, in the iron-based mixed powder No.2-16 (conventional example), as the iron-based mixed powder, the iron-based powder No.N (only powdered pure iron powder) is used, and the iron-based powder No.N is not used Powdered iron powder to which copper powder was partially alloyed was adde...

Embodiment 3

[0226] 1 ton of iron-based mixed powder Nos. 1, 16, and 19 of Example 1 and iron-based mixed powder Nos. 2-1 and 2-16 of Example 2 were produced, respectively. By powder metallurgy using each mixed powder, with Figure 3A and Figure 3B 1000 spur gears (dimension unit: mm) are manufactured continuously in the metal casting mold of the metal casting hole shape shown. Figure 3A The tooth part of is shown in abbreviated form, which is a tooth with a reference pitch circle diameter (the reference pitch circle diameter indicated by a single dotted line) of 38 mm, a tooth tip diameter of 40 mm, and a number of teeth of 38 (module = 1). In addition, the tooth shape is made into an involute tooth shape.

[0227] Fill the gear shape with powder mix using the following Figure 3A A metal mold for the flat shape of the metal casting hole, and figure 1 A similar filling device is used for filling. After the powder box reaches the top of the metal casting hole at a moving speed of 25...

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Abstract

An iron-based mixed powder for powder metallurgy, the powder is composed of pulverized iron powder adhered to the surface by partially alloying copper powder and preferably pulverized pure iron powder, at least graphite powder and free A lubricant for fixing graphite powder and machinability-improving powder on the surface of an iron-based powder with a binder, the iron-based powder having a particle size distribution of 18.5% by mass of particles having a particle diameter of less than 45 μm relative to the total amount of the iron-based powder Less than 46% by mass of particles with a particle size of 75 μm or more and less than 150 μm; less than 10% by mass of particles with a particle size of 150 μm or more and less than 180 μm; 0.5% by mass of particles with a particle size of 180 μm or more. By making such a powder, it is possible to obtain an iron-based powder mixed powder for powder metallurgy with good compressibility and good filling properties.

Description

technical field [0001] The invention relates to an iron-based powder mixed powder for powder metallurgy, in particular to improving the filling property of the iron-based powder mixed powder to a metal mold. Background technique [0002] Generally, the iron-based powder mixed powder for powder metallurgy (hereinafter also referred to as iron-based mixed powder) is mixed with copper powder, graphite powder, iron phosphide powder and other alloy powders in the iron-based powder as the matrix; stearic acid Lubricants such as zinc; and machinability improvement powder added as needed. However, the iron-based mixed powder contains various powders that differ in size, shape and density. For this reason, when conveying after mixing, loading or unloading into a hopper, filling into a metal mold, and press molding, etc., the particles in the mixed powder are unevenly distributed, and segregation is likely to occur in particle size, shape, and chemical composition. [0003] For exam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/00
Inventor 上之园聪峰岸俊幸
Owner JFE STEEL CORP
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