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Powder metallurgy iron-based material suitable for high speed boring and preparation method

A technology of powder metallurgy and iron-based materials, which is applied in the field of powder metallurgy iron-based materials and its preparation, can solve the problems of accelerated wear, poor machinability, prone to chipping, etc., and achieve extended service life, low manufacturing cost, stable and reliable high-speed Effect of Boring Machinability

Active Publication Date: 2013-02-13
湖南屹林材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this processing method has not been widely used in ordinary powder metallurgy iron-based products, mainly because ordinary powder metallurgy iron-based materials have pores with a volume percentage of 10-20%. Due to the high-speed fretting impact, the edge of the grain is prone to chipping and accelerated wear, which leads to the poor machinability of ordinary powder metallurgy iron-based materials. Even if cubic boron nitride is used, the grain life is only 3 -5 pieces

Method used

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  • Powder metallurgy iron-based material suitable for high speed boring and preparation method
  • Powder metallurgy iron-based material suitable for high speed boring and preparation method
  • Powder metallurgy iron-based material suitable for high speed boring and preparation method

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Embodiment 1

[0034] Prepare a powder metallurgy iron-based material suitable for high-speed boring processing, including: iron 96wt%, copper 1wt%, manganese sulfide 1wt%, molybdenum disulfide 0.8wt%, calcium fluoride 0.3wt%, magnesium fluoride 0.3wt% %, graphite 0.6wt%. Its preparation process includes the following steps: put the weighed materials into a V-type mixer for 60 minutes; press the blank in a steel mold with a pressing pressure of 500 MPa and a holding time of 3 seconds; , the heating rate is 8-10°C per minute, and the pressed blank is evenly heated from room temperature to 1050°C for 1 hour, then kept at 800-900°C for 1 hour, and then uniformly cooled to below 200°C to obtain sintered powder metallurgy iron base Material.

[0035] Properties of the sintered powder metallurgy iron-based material prepared in this example: density 6.90g / cm 3 , hardness 70-90HB, tensile strength 280-320MPa; high-speed boring processing performance is good, when using cubic boron nitride cutter g...

Embodiment 2

[0037] Prepare a powder metallurgy iron-based material suitable for high-speed boring processing, including: iron 95wt%, copper 2wt%, manganese sulfide 1wt%, molybdenum disulfide 0.8wt%, calcium fluoride 0.3wt%, magnesium fluoride 0.3wt% %, graphite 0.6wt%. The preparation process includes the following steps: put the weighed materials into a V-shaped mixer for 60 minutes; press the blank in a steel mold with a pressing pressure of 600 MPa and a holding time of 3 seconds; , the heating rate is 8-10°C per minute, and the pressed blank is evenly heated from room temperature to 1100°C for 1 hour, then kept at 800-900°C for 1 hour, and then uniformly cooled to below 200°C to obtain sintered powder metallurgy iron base Material.

[0038] Properties of the sintered powder metallurgy iron-based material prepared in this example: density 6.95g / cm 3 , hardness 80-100HB, tensile strength 320-380MPa; high-speed boring processing performance is good, when using cubic boron nitride cutte...

Embodiment 3

[0040] Prepare a powder metallurgy iron-based material suitable for high-speed boring processing, including: iron 94wt%, copper 2wt%, manganese sulfide 2wt%, molybdenum disulfide 0.6wt%, calcium fluoride 0.3wt%, magnesium fluoride 0.3wt% %, graphite 0.8wt%. The preparation process includes the following steps: put the weighed materials into a V-shaped mixer for 90 minutes; press the blank in a steel mold with a pressing pressure of 700 MPa and a holding time of 3 seconds; , the heating rate is 8-10°C per minute, and the pressed blank is evenly heated from room temperature to 1050°C for 1 hour, then kept at 800-900°C for 1 hour, and then uniformly cooled to below 200°C to obtain sintered powder metallurgy iron base Material.

[0041] Properties of the sintered powder metallurgy iron-based material prepared in this example: density 6.85g / cm 3, hardness 70-90HB, tensile strength 270-310MPa; high-speed boring processing performance is good, when using cubic boron nitride cutter ...

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Abstract

The invention discloses a powder metallurgy iron-based material suitable for high speed boring and a preparation method. The powder metallurgy iron-based material comprises the following raw materials in percentage by weight: 1-2% of copper, 1-2% of manganese sulfide, 0.5-1% of molybdenum disulfide, 0.3% of calcium fluoride, 0.3% of magnesium fluoride, 0.6-0.8% of graphite, and the balance of iron, wherein the iron, the copper and the graphite are added in the form of elemental powder, while the manganese sulfide, the molybdenum disulfide, the calcium fluoride and the magnesium fluoride are added in the form of compounds. The preparation method comprises the following three steps of mixing, molding and sintering heat treatment. According to the invention, the preparation method is simple and feasible, the prepared powder metallurgy iron-based material has good high-speed fine machining properties and mechanical properties and can meet requirements of an existing high-speed boring machine tool on the machining surface quality and the use of a cutter, and the use requirements of related household appliances on sliding bearing part products. Due to the application of the invention, the purpose of replacing grinding with boring can be realized, the production cost can be reduced significantly, and the machining surface quality can be improved. The invention is suitable for industrial popularization and application.

Description

technical field [0001] The invention relates to a powder metallurgy iron-based material suitable for high-speed boring processing and a preparation method. The invention belongs to the technical field of powder metallurgy material preparation. Background technique [0002] With the rapid development of powder metallurgy technology, powder metallurgy iron-based products have been widely used in various fields such as automobiles, motorcycles, and home appliances, and the precision requirements are getting higher and higher. In order to ensure the precision requirements, grinding is often used in the process, but this method has low efficiency and high manufacturing cost. Modern technology often replaces grinding with high-speed (speed 12000-14000r / min) boring to reduce costs. High-speed boring has high efficiency (it only takes 3-5 seconds to process a single piece of φ20×50mm bushing), high precision (roundness 0.002-0.004mm, straightness ≤0.003mm, roughness Rz ≤3.2um), an...

Claims

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Application Information

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IPC IPC(8): C22C38/16C22C33/02B22F1/00B22F3/16B23B27/14
Inventor 彭世超熊翔党胜云刘如铁刘旭
Owner 湖南屹林材料技术有限公司
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