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Method for manufacturing powder metallurgy support

A manufacturing method, powder metallurgy technology, applied to other manufacturing equipment/tools, turbines, engine components, etc., can solve the problems of increased cost and no competitive advantage, and achieve reduction of solder, elimination of excessive laser welding parts, and high precision of parts Effect

Active Publication Date: 2016-03-30
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase in density is subject to the function, chemical composition, properties of iron powder, forming process, sintering process and post-processing process (powder hot forging, etc.) of the product. Therefore, compared with parts made of cast iron, the cost of the product increases, and the powder Fundamental metallurgical process, no competitive advantage

Method used

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  • Method for manufacturing powder metallurgy support
  • Method for manufacturing powder metallurgy support
  • Method for manufacturing powder metallurgy support

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment one: (support with vent hole)

[0030] ①. Prepare the raw materials, that is, the mixed powder of iron, chromium, molybdenum and carbon. The ratio is: iron alloy (3.0% for chromium, 0.5% for molybdenum, other unavoidable substances, less than 1%, iron as the balance) is 99.0 %; carbon is 0.40%, and then add lubricant with a content of 0.60%;

[0031] Among them, chromium and molybdenum are added in the form of iron alloy or master alloy or element powder, carbon is added in the form of graphite, and then lubricant is added; lubricant and graphite are added by bonding;

[0032] ②. Press the above mixed powder under a pressure of 600MPa to a density of 6.65g / cm 3 The support blank;

[0033] ③, sintering, the support part is sintered at a temperature of 1200 ° C, the sintering time is 20 minutes, and the sintering is carried out in a vacuum sintering furnace;

[0034] ④ Annealing: the annealing temperature is 850°C; the atmosphere is nitrogen, the annealing h...

Embodiment 2

[0040] Embodiment two: (without vent support)

[0041] ① Prepare the raw materials, that is, the mixed powder of iron, chromium, molybdenum and carbon. The ratio is: iron alloy powder (chromium is 3.0%, molybdenum is 0.5%, other unavoidable substances, less than 1%, iron is the balance) is 50 %, pure iron powder is 49.3%; carbon is 0.3%, and then add a lubricant with a content of 0.4%;

[0042] Among them, chromium and molybdenum are added in the form of iron alloy or master alloy or element powder, carbon is added in the form of graphite, and then lubricant is added; lubricant and graphite are added by bonding;

[0043] ②Compress the above mixed powder under a pressure of 600MPa to a density of 6.8g / cm 3 The support blank;

[0044] ③Sintering, the support part is sintered at a temperature of 1120°C, the sintering time is 20 minutes, and the sintering is carried out in a sintering furnace based on nitrogen and the proportion of hydrogen is 10vol%;

[0045]④ Extrusion (finis...

Embodiment 3

[0049] ① Prepare the raw material, that is, the mixed powder of iron and carbon: iron powder (unavoidable other substances are less than 1%, iron is the balance) is 99.0%; carbon is 0.5%, and then add a lubricant with a content of 0.5%;

[0050] Carbon is added in the form of graphite, and then lubricant is added; lubricant and graphite are added by bonding;

[0051] ② Warm press the above mixed powder under a pressure of 600MPa to a density of 7.10g / cm 3 The support is green; the pressing is formed by warm pressing;

[0052] ③Sintering, sintering the support part at a temperature of 1120°C, and the holding time for sintering is 30 minutes;

[0053] ④ Extrusion (finishing): Extrusion is performed on a press modified by an extrusion molding machine or a finishing press, and the extrusion deformation is greater than 4% in the diameter direction, that is (Φ1 挤压件 -Φ1 烧结件 ) / Φ1 烧结件 ×100%≥4%, Φ1 烧结件 is the outer diameter of the sintered state, Φ1 挤压件 is the outer diameter of th...

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Abstract

A method for manufacturing a powder metallurgy support comprises the steps that iron, chrome, molybdenum, manganese, nickel, carbon and copper are mixed into mixed powder according to the mass percent; the mixed powder is compressed into a support green body with the density being 6.2-7.2 g / cm<3> by a press; the support green body is sintered under the temperature of 1000-1350 DEG C, the sintering time is 5-180 minutes, and annealing is conducted in a non-oxidizing atmosphere; extrusion is conducted by the press formed by modifying an extrusion moulding machine or a finishing press, and the extrusion deformation degree is larger than or equal to 2% in the diameter direction; selective processing is conducted according to dimension requirements, and steam treatment is conducted. The method for manufacturing the powder metallurgy support has the advantages that the manufacturing process is simple, the precision is high, the surface smoothness is good, and the problem that a mould is likely to fracture due to the fact that the forging process is conducted under high temperatures is effectively solved, so that the production cost is lowered and the production efficiency is improved. Compared with a traditional powder metallurgy process, the density of products is higher, and surface densification is basically achieved.

Description

technical field [0001] The invention relates to a manufacturing method of a powder metallurgy bearing, in particular to a manufacturing method of a compressor bearing. Background technique [0002] At present, in the compressor industry, high-power compressors are machined from casting blanks. The method of machining is slow, the utilization rate of materials is low, and the product consistency is poor. The support is matched with the support, and the general compressor is assembled by welding the support or the support to the compressor shell. The processed products are assembled by welding during assembly. For the welding of cast iron, because it is a conventional material, there are no major process problems in general compressor factories, and the welding quality and welding strength can be better guaranteed. However, for powder metallurgy parts, due to the existence of pores, the number, shape and distribution of pores affect the physical properties of the material s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F3/24B22F5/00
Inventor 包崇玺詹学救周国燕毛增光
Owner NBTM NEW MATERIALS GRP
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