CN201824041U

CN201824041U - Crack repaired wheel

Info

Publication number: CN201824041U
Application number: CN2010205048150U
Authority: CN
Inventors: 谭宇海; 关世武; 冯福庆
Original assignee: Railway Transport Equipment Manufacturing Co of Anshan Iron and Steel Group
Current assignee: Railway Transport Equipment Manufacturing Co of Anshan Iron and Steel Group
Priority date: 2010-08-26
Filing date: 2010-08-26
Publication date: 2011-05-11
Anticipated expiration: 2020-08-26

Abstract

The utility model relates to the field of large-sized metallurgical vehicles, in particular to a crack repaired wheel, which comprises a wheel base. The crack repaired wheel is characterized in that wedged fillings are arranged at cracks on a tread of the wheel base, and each wedged filling is in a multilayer composite structure. Each wedged filling includes a bottom reinforcing layer and a surface hard layer, the reinforcing layer is a nickel-based welded layer, the hard layer is a wear-resistant alloy welded layer having an HRC (hardness of Rockwell scale C), and the wear-resistant alloy welded layer is a low hydrogen-sodium coated tungsten carbide surfaced layer using carbon steel as weld wires. Compared with the prior art, the crack repaired wheel has the advantages that use of the composite-layer filling structure guarantees firm bonding with the wheel base and no crack, also enables hardness and wear resistance of the wheel tread to meet the operational performance requirements of the large-sized metallurgical vehicles, solves crack problems of wheels after heat treatment, and overcomes the shortage of low production qualification rate of the large-sized metallurgical vehicle wheels, and product cost can be reduced as the crack repaired wheel can be produced on a large scale.

Description

The wheel that a kind of crackle is repaired

Technical field

The utility model large-scale metallurgical vehicular field relates in particular to the wheel that a kind of crackle is repaired.

Background technology

Wheel is one of main and vitals of large-scale metallurgical vehicle, when wheel face walking in orbit, bear the pressure and the frictional force of light weight and whole Baogang water generates, act on about about 100 tons of pressure on the wheel tread, so wheel must have good comprehensive mechanical properties and enough hardened layers.

Heat treatment step is arranged twice in the production process of wheel, be that bulk heat treatmet makes the hardness of matrix reach HB=220～280 for the first time, for the second time be that the processing of wheel tread surface heat is carried out in fine finishining later on, case hardness reaches HRC=48～53, quench-hardened case thickness 5mm.Because the phosphorus content of wheel material, is subjected to the influence of many-sided factors such as the shape of workpiece and heat treatment temperature simultaneously again than higher, wheel in heat treatment process particularly in the hard-faced process of last procedure the wheel tread place very easily crack.The wheel that occurs crackle on tread can not use in accordance with regulations, by scrapping processing.Because large-scale metallurgical wheel of vehicle production cost height, complex procedures, process-cycle are long, scrap to enterprise and bring very big economic loss and the delay of duration.

The material of the wheel that we use always is high-carbon steel such as ZG50Si2Mn and ZG340-640, this class steel is because carbon content higher (0.45%～0.65%), the sclerosis of postwelding, crackle sensitivity are inclined to very big, so weldability is relatively poor, belong to welding-resistant metal, if adopt the welding material of plasticity and good toughness, the hardness of postwelding wheel tread does not reach requirement, wears no resistance; If adopt the good welding material of intensity high rigidity, then when welding, be easy to generate crackle, weld metal comes off easily, so multiple wear wheel has no small difficulty.

Summary of the invention

The purpose of this utility model provides the wheel that a kind of crackle is repaired, and satisfies the requirement of the intensity and the hardness of wheel, reduces production costs.

For achieving the above object, the utility model is achieved through the following technical solutions:

The wheel that a kind of crackle is repaired comprises the wheel matrix, it is characterized in that wheel matrix tread cracks is provided with the wedge obturator, and described wedge obturator is a multi-layer compound structure.

Described wedge obturator comprises the enhancement layer of bottom and the rigidity layer on surface, and enhancement layer is Ni-based layer, and rigidity layer is the antifriction alloy layer of HRC 〉=60.

It is the low hydorgew sodium type coating tungsten carbide built-up welding layer of core wire that described antifriction alloy layer adopts carbon steel.

Compared with prior art, the beneficial effects of the utility model are: by the composite bed filling structure, can guarantee and wheel matrix strong bonded, do not crack, can make the hardness of wheel tread and the requirement that anti-wear performance satisfies large-scale metallurgical vehicle serviceability again, solve the problem that occurs crackle after wheel heat is handled, overcome the low weakness of large-scale metallurgical wheel of vehicle production qualification rate, can produce in enormous quantities, reduce production cost, improve economic benefit of enterprises.

Description of drawings

Fig. 1 is the utility model wedge obturator partial schematic diagram;

Fig. 2 is the crack position schematic diagram.

Among the figure: 1-wheel matrix 2-tread 3-wedge obturator 4-enhancement layer 5-rigidity layer

The specific embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present utility model is described further:

See Fig. 1, the wheel that a kind of crackle is repaired comprises wheel matrix 1, and wheel matrix tread 2 cracks are provided with wedge obturator 3, and described wedge obturator 3 is a multi-layer compound structure.Described wedge obturator 3 comprises the enhancement layer 4 of bottom and the rigidity layer 5 on surface, and enhancement layer is Ni-based layer, and rigidity layer is the antifriction alloy layer of HRC 〉=60.It is the low hydorgew sodium type coating tungsten carbide built-up welding layer of core wire that described antifriction alloy layer adopts carbon steel.See Fig. 2, crackle generally occurs in the included angle A place of wheel matrix 1 and tread 2.

As follows in the REPAIR WELDING process of the wheel that a kind of crackle is repaired:

1, weldering front vehicle wheel matrix 1 preheating, preheat temperature is 250 ℃～280 ℃, preheat temperature reaches and is incubated 2 hours right and lefts again after the requirement and can welds;

2, select suitable welding condition according to enhancement layer 4 and rigidity layer 5 welding materials;

3, welding adopts thin layer, segmentation, room for manoeuvre solder technology, forces down arc length as far as possible, avoids adopting weave bead welding, and before welding finished blow-out, backfill 5mm was to fill arc crater;

To thoroughly remove welding slag with the steel wire brush when 4, welding second road;

5, in the welding process except that bottom and superficial layer every layer adopt hammering method to eliminate stress;

6, postwelding is placed in the heating furnace and is incubated 2 hours with about 250 ℃, then slowly cooling.

Enhancement layer metal employing good mechanical property, the nickel-base welding rod welding that crack resistance is strong, plasticity is big have good fusion performance to guarantee obturator metal and wheel parent metal, improve the plasticity and toughness of weld metal, increase crack resistance.The rigidity layer surface hardness can reach HRC 〉=60, can guarantee weld metal and wheel matrix strong bonded like this, do not crack, can make the hardness of wheel tread of postwelding and the requirement that anti-wear performance satisfies large-scale metallurgical vehicle serviceability again, in actual use respond well of wheel after the REPAIR WELDING, wheel after REPAIR WELDING finishes need not to heat-treat once more, can use after process defect detecting test is qualified.

Claims

1. the wheel that crackle is repaired comprises the wheel matrix, it is characterized in that wheel matrix tread cracks is provided with the wedge obturator, and described wedge obturator is a multi-layer compound structure.

2. the wheel that a kind of crackle according to claim 1 is repaired is characterized in that, described wedge obturator comprises the enhancement layer of bottom and the rigidity layer on surface, and enhancement layer is Ni-based layer, and rigidity layer is the antifriction alloy layer of HRC 〉=60.

3. the wheel that a kind of crackle according to claim 2 is repaired is characterized in that it is the low hydorgew sodium type coating tungsten carbide built-up welding layer of core wire that described antifriction alloy layer adopts carbon steel.