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Compression-torsion forging forming method for high-purity and high-density powder metallurgical product

A technology of powder metallurgy and molding method, applied in the field of metal metallurgy, can solve the problems of complex equipment and difficult equipment, and achieve the effects of simple and easy operation, less impurities, and low cost

Inactive Publication Date: 2019-07-16
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the compression-torsion deformation technology is rarely used in industrial applications because of the complexity of the equipment, especially the application of torsional motion is the most difficult point of equipment transformation.

Method used

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  • Compression-torsion forging forming method for high-purity and high-density powder metallurgical product
  • Compression-torsion forging forming method for high-purity and high-density powder metallurgical product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Select pure tungsten with a purity of 99.99% and a weight of 5.0 kg, and a mixed powder of pure titanium with a powder purity of 99.95% and a weight of 1.0 kg as raw materials.

[0043] In the press torsion forging die, the inner diameter of the lower die part is 200 mm, and the inner cavity depth is 30 mm. The diameter of the medium pressure torsion head of the upper mold is 198mm, and the thickness is 35mm. The maximum diameter of the rotating inertial body is 500mm and the thickness is 100mm. The core rod matches the rolling bearing with a diameter of 50 mm. The first thrust bearing adopts model 51318, and its rated dynamic load is 205KN. The second thrust bearing adopts model 51110, and its rated static load is 69.2KN; the whole set of mold is installed in the pressure center of a 315-ton hydraulic press.

[0044] The press torsion forging forming method comprises the following steps:

[0045] First, the mixed powder weighing 6.0 kg is pre-pressed at room temper...

Embodiment 2

[0050] Pure molybdenum powder with a purity of 99.95% and a weight of 5.0 kg is selected as the raw material.

[0051] Compression torsion forging die, in which the inner diameter of the lower die part is 200 mm, and the depth of the inner cavity is 30 mm; the diameter of the upper die part is 198 mm, and the thickness is 35 mm; the maximum diameter of the rotating inertial body is 500 mm, and the thickness is 100 mm; the core The diameter of the rod matching rolling bearing is 50mm; the first thrust bearing is model 51318, and its rated dynamic load is 205KN; the second thrust bearing is model 51110, and its rated static load is 69.2KN; the whole set of mold is installed with the pressure center of a 315-ton hydraulic press.

[0052] The press torsion forging forming method comprises the following steps:

[0053] First, 5.0 kg of pure molybdenum powder is pre-pressed at room temperature using a steel mold with a diameter of 198 mm and a pressure of 180 MPa to obtain a green b...

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Abstract

The invention provides a compression-torsion forging forming method for a high-purity and high-density powder metallurgical product. According to the compression-torsion forging forming method for thehigh-purity and high-density powder metallurgical product, a compression-torsion forging die is utilized for operating; and the compression-torsion forging die comprises an upper die part and a lowerdie part, the upper die part and the lower die part are located by virtue of a guide column and a guide sleeve, the upper die part comprises a rotary inertial body, and an auxiliary mechanism of thecompression-torsion forging die comprises a press machine driving the upper die part to move up and down, and a drive mechanism driving the rotary inertial body to rotate. The compression-torsion forging forming method for the high-purity and high-density powder metallurgical product comprises the following steps: heating and sintering a pre-pressed powder compact at first, turning on the drive mechanism for the rotary inertial body to enable the rotary inertial body to carry out high-speed rotary movement, placing the heated compact in a material forming area, and then cutting off the rotarydrive mechanism and rapidly starting the press machine to enable the upper die part to move close to the lower die part, and applying torsion and forging-pressing loading on the green compact by the rotary inertial body and only through the high-speed inertial rotation; and completing the machining after the movement of the rotary inertial body is stopped. The method is capable of obtaining circular-cake products or bowl-cone products with less or no impurities, high density, and excellent microstructures.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a press-torsion forging forming method for high-purity and high-density powder metallurgy products. Background technique [0002] Powder metallurgy products are usually various types of metal materials and composite materials manufactured by using metal powder as raw material through forming and sintering technology. Among them, the powder sources mainly include tungsten, molybdenum, tantalum, niobium, zirconium, titanium, magnesium, iron and their alloys, etc. Such products prepared by powder metallurgy technology have high melting point, good thermal conductivity, low thermal expansion coefficient, high temperature deformation resistance It has become the material of choice for high temperature, strong radiation and other occasions, and is widely used in electronics, electric power, national defense and military industry, kiln thermal field structure and other fields. [0003] Howeve...

Claims

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Application Information

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IPC IPC(8): B22F3/17
CPCB22F3/003B22F3/172B22F2003/175
Inventor 杨益航陈莹张厚安
Owner XIAMEN UNIV OF TECH