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Powder metallurgical method

A powder metallurgy and powder technology, applied in metal processing equipment, petroleum industry, base materials, etc., can solve the problems of low demoulding energy and increased manufacturing cost

Inactive Publication Date: 2016-06-08
HYUNDAI MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it has the advantages of ensuring uniformity and low demolding energy, but has the disadvantage of increasing the manufacturing cost too much due to its complicated process

Method used

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  • Powder metallurgical method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: According to the composition ratio of ethylene bisstearamide and erucamide to identify the change of mold release force

[0047] Each lubricant was prepared by changing the composition ratio of ethylene bisstearamide and erucamide as lubricant components to 50:50, 55:45, 60:40, 70:30 wt%. That is, the liquid lubricant was obtained by stirring the lubricant ingredients at a high temperature of 160° C. for 60 minutes. And, the liquid lubricant was cooled to obtain a lump lubricant when stored at room temperature, and then pulverized to obtain a solid lubricant of 10˜40 μm.

[0048] As the iron-based powder, HSPP (Hyundai Steel, pure iron powder) was used. 0.75 parts by weight of the lubricant prepared above was mixed into 100 parts by weight of the iron-based powder to prepare a powder metallurgy composition. Put the powder metallurgy composition into the mold, and then apply a molding pressure of 500MPa to it to obtain a 3 Density shaped body.

[0049] I...

Embodiment 2

[0051] Example 2: Identification of the change in the density of the molded body according to the amount of lubricant added

[0052] According to the metallurgical method of Example 1, a molded body was prepared by using a solid lubricant with a composition ratio of ethylene bisstearamide and erucamide of 70:30 wt%, and based on 100 parts by weight of iron-based powder, along with the solid The added amount of the lubricant was changed to 0.75 parts by weight or 0.40 parts by weight, respectively, and the density change of the molded body was measured.

[0053] exist figure 2 In , 0.75 parts by weight of lubricant was added based on 100 parts by weight of iron-based powder, and three independent times (marked as first, second and third) of the mold release force were measured. A comparison of the results is shown in the figure. according to figure 2 , the demoulding force is as low as 1100kgf, and it is produced with 7.11g / cm by applying a molding pressure of 500MPa 3 ...

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Abstract

A powder metallurgical method includes preparing a liquid lubricant by mixing ethylene bis stearamide 60 to 70 wt % and erucamide 30 to 40 wt % at 150 to 170 DEG C. in a high temperature stirring process. A pulverized solid lubricant is prepared by cooling the liquid lubricant to form a solid and pulverizing the solid. A powder metallurgy composition is prepared by mixing the pulverized solid lubricant 0.4 to 0.75 part by weight to metal-based powder 100 parts by weight, and a molded body is prepared by compression molding of the powder metallurgy composition.

Description

technical field [0001] The invention relates to a powder metallurgy method. More specifically, it relates to a powder metallurgy method capable of reducing the addition of lubricants to metal-based powders to a minimum amount while maintaining forming energy and demolding energy at equal or improved levels. Background technique [0002] Due to the high power obtained by the engine, the components of the vehicle engine and transmission should ensure higher mechanical performance. As a method of improving these mechanical properties, many molding techniques have been developed, but their application is often limited due to increased production costs of parts, damage to molds, and the like when molding under high pressure. In many high-density molding techniques, there are methods for reducing the amount of lubricant added as a means of securing high density at a pressure similar to conventional general molding pressure (400 to 700 MPa). [0003] In the field of powder metall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F1/10B22F1/103
CPCB22F3/02B22F2003/023B22F1/103B22F1/10C10M105/68
Inventor 赵英喆金钟文郭滢锡
Owner HYUNDAI MOTOR CO LTD