Combined powder metallurgy hollow camshaft cam material and preparation method

A technology of powder metallurgy and camshaft, which is applied in the field of combined powder metallurgy hollow camshaft cam material and its preparation, can solve the problems of prolonging the production cycle, increasing energy consumption and cost, and achieving the reduction of cutting processing, material saving, durability good grinding effect

Active Publication Date: 2014-07-02
GRIPM ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology also realizes the metallurgical combination of the steel pipe and the cam through liquid phase sintering, the cam piece needs to be pre-fired after pressing, which increases energy consumption and cost, and prolongs the production cycle

Method used

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  • Combined powder metallurgy hollow camshaft cam material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A combined powder metallurgy hollow camshaft cam material, the cam material alloy composition is C 1.5%, Cr 5%, Mo 1%, P 0.6%, Cu 2%, Si 1.5%, Mn 1%, Ti 1.5%, The balance is Fe.

[0025] The preparation method of the above combined powder metallurgy hollow camshaft cam material:

[0026] (1) Weigh the raw material powder according to the alloy composition of the combined powder metallurgy hollow camshaft cam material, wherein: C is added in the form of graphite, Cu is added in the form of electrolytic copper powder, Cr is added in pure Cr powder, Mo is added in the form of ferromolybdenum, and P is added in the form of Ferrophosphorus is added, Si is added as ferrosilicon, Mn is added as ferromanganese, Ti is added as ferrotitanium, Fe is atomized iron powder. The particle size characteristics of various powders used are: graphite particle size is -200 mesh or finer, electrolytic copper powder particle size is -200 mesh or finer, molybdenum iron powder is ≤25μm ultrafi...

Embodiment 2

[0031] Through the torsion test, check the connection strength between the steel pipe and the cam, compare the torque value of the sample without Ti addition (other alloy composition points are listed in Example 1) and the sample with Ti addition, and the cam made with 1.5% Ti added, its The torque value can reach 1023 N·m, and the torque value of the sample without Ti addition is 912 N·m. The addition of titanium reduces the diffusion activation energy of elements in the matrix, increases the diffusion speed of elements in the matrix, effectively promotes better and faster diffusion of elements at the interface between the steel pipe and the cam, and makes the performance of the interface joint better.

Embodiment 3

[0033] A combined powder metallurgy hollow camshaft cam material, the cam material alloy composition is C 2.5%, Cr 4.5%, Mo 1%, P 0.6%, Cu 2%, Si 1%, Mn 0.3%, Ti 1.0%, The balance is Fe.

[0034] The preparation method of the above combined powder metallurgy hollow camshaft cam material:

[0035] (1) Weigh the raw material powder according to the above combined powder metallurgy hollow camshaft cam material alloy composition, wherein: C is added in the form of graphite, Cu is added in the form of FeCu alloy, Cr is added in the form of high-carbon ferrochrome with a content of 70%, Mo is added as ferromolybdenum, P is added as ferrophosphorus, Si is added as ferrosilicon, Mn is added as ferromanganese, Ti is added as pure titanium powder, and Fe is added as atomized iron powder. The particle size characteristics of the various powders used are: the graphite particle size is -200 mesh or finer, the high-carbon ferrochrome powder, molybdenum powder, etc. , other raw material po...

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Abstract

The invention discloses a combined powder metallurgy hollow camshaft cam material and a preparation method, belonging to the technical field of camshafts for internal combustion engines like automobile engines. The alloy components of the camshaft material comprise 1.5-3% of C, 3-7% of Cr, 0.5-1.5% of Mo, 0.3-0.6% of P, 1-3% of Cu, 0.05-1.5% of Si, 0.05-1.5% of Mn, 0.01-1.5% of Ti, and the balance of Fe. The powder is pressed into a cam sheet, the mandrel adopts a seamless steel tube, the cam sheet and the seamless steel tube are in clearance fit, and the cam sheet and the steel tube are assembled and then are sintered. The green body of the cam is directly assembled with the steel tube and then is sintered. In sintering, the powdery material shrinks and is densified and also forms metallurgical bonding with the steel tube, so that the bonding strength is high, the performance is reliable, the prepared cam has advantages of high torque, small stress, light weight and good abrasion resistance.

Description

technical field [0001] The invention belongs to the technical field of new production technology of camshafts for internal combustion engines such as automobile engines, and in particular relates to a combined powder metallurgy hollow camshaft cam material and a preparation method thereof. Background technique [0002] In recent years, in order to save energy and reduce pollution, the weight reduction of automobiles has become more and more important. Every 10% reduction in vehicle weight can reduce fuel consumption by 8%, which not only saves fuel but also reduces exhaust emissions. In order to solve the problems of traditional camshafts such as heavy weight, low material utilization rate, and high processing cost, the design concept of the new camshaft must be less machining, less mass, and compact structure. At the same time the various parts of the shaft must meet different performance requirements. The cam plate should have high wear resistance, glue resistance and pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C38/36C22C33/02B22F5/00
Inventor 陈鹏王林山梁雪冰董小江穆艳茹汪礼敏王磊
Owner GRIPM ADVANCED MATERIALS CO LTD
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