A method for enhancing the surface of metal rolls by electrospark deposition combined with plasma cladding

A plasma cladding and electric spark deposition technology, applied in the field of metal rolls, can solve the problems of poor heat resistance of the quenching hardened layer, poor bonding between the coating and the substrate, and high maintenance costs, and achieve good heat resistance and wear resistance. Excellent wear and heat resistance, good anti-wear and anti-corrosion properties

CN103805934BInactive Publication Date: 2016-01-06NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-01-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for strengthening a surface of a metal roller by adopting an electro-spark deposition method and a plasma fusion covering method. The metal roller is processed in an electro-spark deposition way and a plasma fusion covering way, so that the problems for improving the hardness, abrasion resistance and impact resistance of the surface of the roller and prolonging the service life of the metal roller can be effectively solved. The method comprises the following steps: performing fusion covering of alloy powder onto the surface of the roller by utilizing non-oxidized plasma beam to form a molten alloy coating, depositing WC ceramic hard alloy by utilizing the electro-spark deposition way on the basis of the plasma fusion covering coating to form a composite coating integrating the electro-spark deposition and plasma fusion covering. The method is simple and practical, the electro-spark deposition and the plasma fusion covering composite coating is firmly combined with a substrate, the thickness of the coating is large, so that the surface hardness, compactness, heat resistance and abrasion resistance of the roller are good, and the service life is long; by adopting the composite coating, the price of the iron-nickel alloy powder is low, the thickness of the coating is large, the abrasion resistance and corrosion resistance are good, the hardness and strength are high, and the abrasion and heat resistance is excellent.
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Description

technical field

[0001] The present invention relates to a metal roll, in particular to a method for enhancing the surface of a metal roll by electric spark deposition combined with plasma cladding. Background technique

[0002] In the metallurgical steel industry, as my country has become the largest manufacturing country in the world, and steel rolling is an important field in steel production, rolls are an important tool for steel mills to roll steel plates (steel strips) or steel bars, and they are also an important tool for rolling steel. One of the main consumable spare parts in production. The working conditions of the roll are generally very harsh. It has to withstand very complex alternating loads and impacts, as well as the working conditions of rapid cooling and rapid heating. In addition to sufficient strength and toughness, it is also required to have high wear resistance and resistance. Thermal and impact resistance. Therefore, improving the hardness of the rol...

Examples

Embodiment 1

[0015] In the specific implementation of the present invention, it is realized by the following steps:

[0016] (1) Preparation of iron-nickel alloy powder, the alloy powder is calculated by weight percentage: Ni31%, Cr28%, C1.5%, Mo4%, B2.8%, Si4%, W3% and the balance is Fe The powder is mixed together, and the particle size is 106-180mm;

[0017] (2) Use plasma cladding wear-resistant equipment to clad iron-nickel alloy powder layer on the surface of the roll, input power supply voltage: 380V±10%, rated input capacity: 30KVA, output voltage: 75V, working voltage: 10 ~ 30V, output Power 12-15KW, output current: 300~600A, scanning speed: 300~600mm / min, powder feeder airflow: 0.65~0.75m 3 / h, powder feeding rate is 250-300g / min, ion gas flow rate: 0.6~0.9m 3 / h, protective gas flow: 0.65 ~ 0.75m 3 / h, the diameter of the nozzle is 5mm, and the distance between the nozzle and the workpiece is 28-32mm;

[0018] (3) The method of cladding the iron-nickel alloy powder layer 2 i...

Embodiment 2

[0021] In the specific implementation of the present invention, the iron-nickel alloy powder can also be calculated by weight percentage: Ni32%, Cr26%, C2%, Mo3%, B3%, Si3.5%, W4.5% and the remainder It is Fe powder, which is mixed together to form, and the others are the same as in Example 1.

Embodiment 3

[0023] In the specific implementation of the present invention, the iron-nickel alloy powder can also be calculated by weight percentage: Ni31%, Cr30%, C1%, Mo4.5%, B2.5%, Si5%, W2% and the balance It is Fe powder, which is mixed together to form, and the others are the same as in Example 1.

[0024] After experiments and tests of the present invention, a large number of nano-amorphous microcrystalline particles appear in the coating, and the coating density is high; the high temperature of 16000 ℃ in plasma cladding and 25000 ℃ in electric spark deposition causes the composite coating and the substrate to produce coating incompatibility. The metallurgical bond that will fall off; the surface hardness of the coating can reach 1707.6HV ~ 2084.1HV, while the hardness of the substrate is 352.1HV, the hardness of the coating can be increased by 4-6 times than that of the substrate; the wear resistance of the composite coating is higher than The wear resistance of the matrix can be...