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Extrusion rod for compacting inner surface of powder metallurgy part and manufacturing method of part

A technology of powder metallurgy and manufacturing method, which is applied in the field of powder metallurgy, can solve problems such as unsatisfactory cost and large mold loss, and achieve the effects of long mold life, performance improvement, and expanded application fields

Pending Publication Date: 2021-05-14
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cold extrusion method has a large die loss, and the cost is still difficult to meet the requirements of industries such as automobiles and motorcycles.

Method used

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  • Extrusion rod for compacting inner surface of powder metallurgy part and manufacturing method of part
  • Extrusion rod for compacting inner surface of powder metallurgy part and manufacturing method of part
  • Extrusion rod for compacting inner surface of powder metallurgy part and manufacturing method of part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Such as Figure 1 to Figure 12 Shown is the first preferred embodiment of the present invention.

[0044] Such as image 3 As shown, the extrusion system of this embodiment includes a female mold 2 and an extrusion rod 1 used to compact the inner surface of powder metallurgy parts. The center of the female mold 2 is provided with a central hole 31 for the parts to be extruded In the opening 21 therein, a step 211 for placing parts 3 to be extruded is formed in the opening 21, such as Figure 7 As shown, the longitudinal section of the opening 21 of the female mold 2 is T-shaped. Such as figure 1 As shown, the center of the part 3 to be extruded has a central hole 31 .

[0045] Such as image 3 As shown, the extruded rod 1 of this embodiment includes a core rod 11 , an extruded part 12 , a support ring 13 , a guide part 14 and a nut 15 . The mandrel 11 is arranged vertically, and the longitudinal section of the mandrel 11 is substantially T-shaped. The mandrel 1 in...

Embodiment 2

[0055] The difference between this embodiment and the above-mentioned embodiment 1 is that: in step 5), the extrusion amounts of each gear are different, specifically, the total extrusion deformation design amount Δd is 5%, the extrusion amount of the first gear is 2.5%, and the extrusion amount of the second gear is 2.5%. 1.5% extrusion amount, 1% extrusion amount in the third gear, wherein the extrusion amount of the first gear is the extrusion amount after extrusion of the extrusion part 12 located at the bottom, and the extrusion amount of the second gear is the extrusion amount of the middle one. The extrusion amount of the extruded piece 12 after extrusion, and the extrusion amount of the third gear is the extrusion amount of the uppermost extrusion piece 12 after extrusion.

Embodiment 3

[0057] The difference between this embodiment and the above-mentioned embodiment 1 is that the composition design and parameter selection in the preparation method are different, as follows:

[0058] This embodiment uses the above-mentioned extruder to prepare the manufacturing method of powder metallurgy parts, which includes the following steps in turn:

[0059] 1) Material composition design: sintered steel is used, such as iron-chromium-molybdenum pre-alloyed powder and carbon-copper mixed powder. The composition is calculated according to mass percentage: atomized iron powder is 95.6%; carbon is 0.80% and copper powder is 3%. , and then add a lubricant with a content of 0.6%;

[0060] 2) Pressing: the mixed powder in step 1) is pressed on a press with a pressing pressure of 550 MPa and pressed to a density of 7.0 g / cm 3 green parts;

[0061] 3) Sintering: the green part of step 2) is sintered at a temperature of 1300° C., and the sintering time is 30 minutes;

[0062] ...

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Abstract

The invention relates to an extrusion rod for compacting the inner surface of a powder metallurgy part and a manufacturing method of the part. The extrusion rod for compacting the inner surface of the powder metallurgy part comprises a core rod and extrusion parts, the longitudinal section of the core rod is basically T-shaped, and the core rod comprises a vertically arranged rod body and a connector arranged at the top of the rod body; the extrusion parts are annular, are arranged on the periphery of the rod body in a sleeving manner and are positioned below the connector; and the extrusion rod for compacting the inner surface of the powder metallurgy part is characterized in that the number of the extrusion parts is at least two, the extrusion parts are arranged in the length direction of the rod body at intervals, an annular supporting ring arranged on the periphery of the rod body in a sleeving mode is arranged between every two adjacent extrusion parts, and the size of the outer contour of each extrusion part is gradually increased from bottom to top. The extrusion rod can intermittently and slidably extrude the inner surface of a central hole of a subsequent to-be-extruded part, so that the density of the inner surface of the to-be-extruded part is improved, surface pores are reduced, and the density of the inner surface of the central hole of the to-be-extruded part is improved.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and in particular relates to an extrusion rod used for dense inner surfaces of powder metallurgy parts and a manufacturing method for using the extrusion rod to prepare powder metallurgy parts. Background technique [0002] Powder metallurgy is the technical discipline of manufacturing metal powder and using metal powder (including mixed non-metal powder) as raw material to manufacture materials or products by the basic method of forming and sintering. In a broad sense, it also includes the technology of manufacturing materials or products by forming-sintering methods using non-metallic compound powders such as oxides, nitrides, and carbides as raw materials. The powder metallurgy process is a technical process in which raw material powder is added into a certain mold cavity, pressurized and formed, and then sintered under certain conditions, or sintered in a specific mold to obtain a product. W...

Claims

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Application Information

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IPC IPC(8): B22F3/20B22F3/02B22F3/24B22F5/10C21D1/18C21D1/26C21D1/74C21D6/00C21D9/00C22C38/42C22C38/44
CPCB22F3/003B22F3/02B22F3/20B22F3/24B22F5/10B22F2003/248C21D1/18C21D1/26C21D1/74C21D6/004C21D9/0068C22C38/42C22C38/44
Inventor 冯伟立毛增光王佳峰钱飞达朱志荣
Owner NBTM NEW MATERIALS GRP
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