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A kind of laser cladding powder for 12crni3 camshaft remanufacturing and preparation method thereof

A laser cladding and remanufacturing technology, used in metal processing equipment, transportation and packaging, coating, etc., can solve the problems of high cost, complex process, tiny pores in the camshaft cladding layer, etc., to achieve good performance and simplification. Remanufacturing process, the effect of reducing production costs

Active Publication Date: 2022-06-21
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no laser cladding material for 12CrNi3 on the market. The commercially available low-carbon alloy steel laser cladding powder is used to remanufacture 12CrNi3 camshafts, and the following problems are found:
[0006] 1. There are micro-cracks between the cladding layer and the substrate, which affect the contact fatigue performance of the camshaft;
[0007] 2. There are tiny air hole defects inside the cladding layer of the remanufactured camshaft;
[0008] 3. It is necessary to remove the carburized layer of the failed parts first, the process is complicated and the cost is high

Method used

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  • A kind of laser cladding powder for 12crni3 camshaft remanufacturing and preparation method thereof
  • A kind of laser cladding powder for 12crni3 camshaft remanufacturing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The mass fraction of each element in the 12CrNi3 camshaft remanufactured laser cladding powder provided in this example is: C: 0.35%, Cr: 4.0%; Ni: 7.3%; Al: 4.6%; Mn: 3.4% ; Mo: 0.7%; Si: 0.16%; Nb: 0.3%; Rare earth: 0.015%; S: 0.015%; P: 0.020%; Among them, the rare earth is mixed rare earth, the product brand is 194020A, and the composition should comply with the provisions of "GB / T 4153-2008 Mixed Rare Earth Metals".

[0023] The above-mentioned raw materials, except for Al, are thoroughly mixed and then smelted and atomized. Alloy powder with a particle size range of 60 μm-180 μm after atomization is taken and mechanically mixed with Al powder.

Embodiment 2

[0024] Example 2: The mass fraction of each element in the 12CrNi3 camshaft remanufactured laser cladding powder provided in this example is: C: 0.40%, Cr: 3.8%; Ni: 8.2%; Al: 4.3%; Mn: 3.0% ; Mo: 0.5%; Si: 0.20%; Nb: 0.35%; Rare earth: 0.017%; S: 0.015%; P: 0.020%; Among them, the rare earth is mixed rare earth, the product brand is 194020A, and the composition should comply with the provisions of "GB / T 4153-2008 Mixed Rare Earth Metals".

[0025] The above-mentioned raw materials, except for Al, are thoroughly mixed and then smelted and atomized. Alloy powder with a particle size range of 60 μm-180 μm after atomization is taken and mechanically mixed with Al powder.

Embodiment 3

[0026]Example 3: The mass fraction of each element in the 12CrNi3 camshaft remanufactured laser cladding powder provided in this example is: C: 0.45%, Cr: 4.2%; Ni: 8.5%; Al: 4.8%; Mn: 3.6% ; Mo: 0.8%; Si: 0.25%; Nb: 0.4%; Rare earth: 0.014%; S: 0.015%; P: 0.020%; Among them, the rare earth is mixed rare earth, the product brand is 194020A, and the composition should comply with the provisions of "GB / T 4153-2008 Mixed Rare Earth Metals".

[0027] The above-mentioned raw materials, except for Al, are thoroughly mixed and then smelted and atomized. Alloy powder with a particle size range of 60 μm-180 μm after atomization is taken and mechanically mixed with Al powder.

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Abstract

The invention relates to a laser cladding powder for remanufacturing of 12CrNi3 camshafts and a preparation method thereof, belonging to the technical field of remanufacturing, and in particular to a laser cladding powder for remanufacturing of diesel engine camshafts. The laser cladding powder includes the following elements by mass fraction: C: 0.30%‑0.45%, Cr: 2.8%‑4.20%; Ni: 7.0%‑9.0%; Al: 3.5%‑5.0%; Mn: 2.5%‑3.8 %; Mo: 0.4%‑1.0%; Si: 0.15%‑0.3%; Nb: 0.25%‑0.5%; rare earth: 0.013%‑0.020%; the balance is Fe and unavoidable impurities. The laser cladding alloy powder of the present invention can be directly remanufactured without removing the carburized layer of waste parts, which simplifies the remanufacturing process and reduces the production cost of the enterprise, and the obtained cladding layer has no pores, slag inclusions, cracks, etc. Flaws, good performance.

Description

technical field [0001] The invention belongs to the technical field of remanufacturing, and in particular relates to a laser cladding powder for remanufacturing a camshaft of a diesel engine. Background technique [0002] As a big manufacturing country, my country has a huge amount of mechanical and electrical products, and remanufacturing is one of the best ways to recycle mechanical and electrical products. The camshaft is an important part of the engine power transmission mechanism, which drives the valve through the intake and exhaust valves of the cam-driven cylinder. During the operation of the camshaft, the loads it bears include periodic impact loads, contact friction loads, and sliding friction loads. 12CrNi3 is a typical preparation material for diesel engine camshafts. Its main components are C: 0.10%-0.17%, Cr: 0.60%-0.90%, Ni: 2.75%-3.15%, Si: 0.17%-0.37%, Mn: 0.30 %-0.60%, S: ≤0.035%, P: ≤0.035%, Cu: ≤0.030%, belonging to alloy carburized steel. After carbur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10B22F1/05C22C38/02C22C38/06C22C38/22C22C38/26C22C38/38
CPCB22F1/0003C23C24/103C22C38/06C22C38/38C22C38/22C22C38/26C22C38/02C22C38/005C22C38/002
Inventor 殷子强何建群吴成武温道胜张明远任远张光林王守仁成巍
Owner UNIV OF JINAN
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