CN101347893A - Technique for processing albronze hollow roll - Google Patents

Abstract

The invention discloses a processing technique of an aluminum bronze hollow roller. The technique includes the following steps: lathe machining of the excircle of a roller body; preheating the roller body to 350 DEG C; adopting argonaut welding for overlaying welding of the circumferential surface of the roller body, the height of the welding layer being 4-5mm, the welding position being flat welding and a filler wire being single wire; after welding, heating the roller body to 500 DEG C, and taking heat preservation measures so that the roller body can be slowly cooled to room temperature after 12 hours; lathe machining of the roller body to allow the effective thickness of the welding layer to be 3 mm which can meet the requirements of a design paper. The processing technique provided by the invention can improve the utilization rate of materials; meanwhile, in the welding process, metallurgical reaction can happen between aluminum bronze and steel, and aluminum bronze can permeate in steel, so that the bonding strength between a coating and a base material can be enhanced and the service life can be prolonged.

Description

The processing technology of albronze hollow roll

Technical field

The present invention relates to a kind of rollgang technology, especially relate to a kind of processing technology of albronze hollow roll.

Background technology

In the rollgang that the bringing-up section of numerous at home cold rolled annealed pickling lines, soaking zone, cooling section use, the aluminium bronze roller is to be used by a lot of producers for a long time as unique roller, mainly be because being heated in the cooling procedure at cold rolled annealed pickling line, require rollgang both to have good heat-resisting, anti-wear performance, also should have lower hardness, otherwise can scratch the surface of steel plate.Common method is that in the coating of roll body surface spraying 3～4mm, the effective coating after fine finishining can guarantee at 3mm at high-tensile structural steel (Q345D) roll body surface spraying aluminium bronze at present.Because the limitation of spraying technology, spraying is with after the sprayed on material high temperature melting, with compressed air spraying by sprayed surface, because what use in spraying process is that compressed air sprays, the metal that the spraying process hollow band of gas is walked reaches about 30%, add the allowance that needs to carry out fine finishining after the spraying and stay, stock utilization only is about 50%, and its combination mainly is the physical bond process.Coating in use because long term wear is inhomogeneous, also needs regularly roll body to be carried out peripheral milling processing, after grinding machine processing, its effective thickness is less than 1mm, because there are the low characteristics of bonding strength in physical bond, can produce defectives such as peeling, influence service life.

Summary of the invention

At the deficiencies in the prior art, the invention provides a kind of processing technology of albronze hollow roll, adopt full-automatic argon arc welding solder technology to replace spraying technology, improve the adhesion of hollow roll roll surface aluminum bronze coating and base material.

Processing step of the present invention is as follows: (1) with roll body Vehicle Processing cylindrical, requiring roughness is 25; (2) roll body is preheating to 350 ℃; (3) the roll body periphery is adopted the argonaut welding built-up welding, the high 4-5mm of layer, welding wire is the real core of φ 1.6mm, welding current is 170～180A, and weldingvoltage is 24～26V, and speed of welding is 15～17cm/min, protective gas is 99.9% argon gas, shield gas flow rate is 14～15L/min, and the welding position is downhand welding, and filler wire is a monofilament; (4) postwelding is heated to 500 ℃ with roll body, adopts the insulation measure to make roll body slowly cool to room temperature through 12 hours; (5) with the roll body Vehicle Processing, make the layer effective thickness to 3mm, reach the drawing requirement.

The above-mentioned processing technology that the present invention adopts owing to can not take away metal in the welding process, has improved the utilization rate (can reach about 70%) of material; Simultaneously in welding process, the metallurgical reaction of aluminium bronze and iron and steel generation is penetrated in the iron and steel aluminium bronze, has increased the bond strength of coating and base material, and defective such as avoided original peeling, come off has prolonged service life.

The specific embodiment

Embodiment: the processing step of albronze hollow roll is as follows:

(1) be the high-tensile structural steel roll body Vehicle Processing cylindrical of Q345D with material, requiring roughness is 25;

(2) roll body is preheating to 350 ℃;

(3) the roll body periphery is adopted the argonaut welding built-up welding, the high 4-5mm of layer, welding wire is the real core of φ 1.6mm, welding current is 170～180A, and weldingvoltage is 24～26V, and speed of welding is 15～17cm/min, protective gas is 99.9% argon gas, shield gas flow rate is 14～15L/min, and the welding position is downhand welding, and filler wire is a monofilament; The main chemical compositions of layer be aluminium 7.5-9.5%, silicon≤0.2%, zinc≤0.2%, manganese 1.0-2.5%, lead≤0.02%, nickel 1.8-3.0%, iron 1.5-2.5%, copper surplus, other≤0.4%;

(4) postwelding is heated to 500 ℃ with roll body, adopts the insulation measure to make roll body slowly cool to room temperature through 12 hours;

(5) with the roll body Vehicle Processing, make the layer effective thickness to 3mm, reach the drawing requirement.

Claims (1)

1, a kind of processing technology of albronze hollow roll is characterized in that, processing step is as follows:

(1) with roll body Vehicle Processing cylindrical, requiring roughness is 25;

(2) roll body is preheating to 350 ℃;

(3) the roll body periphery is adopted the argonaut welding built-up welding, the high 4-5mm of layer, welding wire is the real core of φ 1.6mm, welding current is 170～180A, and weldingvoltage is 24～26V, and speed of welding is 15～17cm/min, protective gas is 99.9% argon gas, shield gas flow rate is 14～15L/min, and the welding position is downhand welding, and filler wire is a monofilament;

(4) postwelding is heated to 500 ℃ with roll body, adopts the insulation measure to make roll body slowly cool to room temperature through 12 hours;

(5) with the roll body Vehicle Processing, make the layer effective thickness to 3mm, reach the drawing requirement.