CN102899530A - Production method for novel aluminum alloy heat dissipater flat tube - Google Patents

Abstract

The present invention discloses a production method for a novel aluminum alloy heat dissipater flat tube. The production method comprises the following steps: raw material preparing, alloy smelting, casting, an annealing treatment, extrusion, flattening and straightening, an electrostatic liquid phase spray coating treatment, curing and the like. According to the present invention, a ratio of related components in an aluminum material formula is adjusted, and the formula is further optimized so as to improve comprehensive performances of aluminum alloy profiles; and the steps of the annealing treatment, the quenching treatment, the straightening treatment and the like are adopted so as to increase aluminum material internal structure uniformity and grain refinement, and substantially improve quality and processing performances of aluminum alloy profiles.

Description

A kind of production method of aluminium alloy radiator flat tube

Technical field

The present invention relates to a kind of production method of aluminium alloy radiator flat tube, belong to the aluminium alloy extrusions processing technique field.

Background technology

In recent years, aluminium alloy heat radiator is used on the heat abstractor of various electrical equipments, because existing aluminium alloy heat radiator structure, is difficult to processing because little, thin, and processes yieldingly, and impact becomes to be seen.

Summary of the invention

The objective of the invention is provides a kind of aluminium alloy radiator flat tube for the deficiencies in the prior art, improves its processing characteristics, not yielding, and adds copper, and thermal diffusivity is good.

The technical solution used in the present invention is as follows:

A kind of production method of aluminium alloy radiator flat tube is characterized in that, comprises the steps such as feed proportioning, alloy melting, casting, anneal, extruding, pressing and aligning, and concrete steps are as follows:

(1) feed proportioning

Get following raw materials in part by weight: aluminium bar 60-70, aluminium scrap 30-40, copper powder 3-4, nano alumina powder 10-20;

(2) alloy melting

First aluminium ingot, aluminium scrap, copper powder are dropped into smelting furnace and carry out melting, when treating that it becomes molten state, add nano alumina powder, then drop into an amount of AlTiB grain-refining agent and carry out refining, at last by degasification, skim assorted slag, gas in the melt effectively removed;

(3) casting

Before the casting melted aluminium liquid was left standstill 20-30 minute, the relief hole of aluminium liquid by smelting furnace entered crystallizer through the aluminium groove, cast out needed aluminium billet and get model, be cooled to normal temperature, then as required the sawing of aluminium billet is become certain length;

(4) anneal

Carrying out homogenizing annealing after the sawing of aluminium billet processes, detailed process is as follows: be warming up to first under 300-320 ℃, be incubated 2-3 hour, per hour 70-90 ℃ of intensification is heated to 520-550 ℃ of lower insulation 6-8 hour, then air cooling, per hour 60-80 ℃ of intensification is heated to 360-380 ℃ again, and insulation degree 5-6 hour; Be cooled to again 150-180 ℃ of lower insulation 3-4 hour;

(5) extruding

Billet is heated to 420-460 ℃, is incubated 2-3 hour, then utilize extrusion machine that the billet that heats is extruded as the flat tube shape from flat tube mould, die temperature 350-370 ℃, extrusion speed 10-15 m/min, squeeze pressure 180-220 kg/N; Air-cooled flat tube surface temperature is put into 0-3 ℃ of water and was carried out quench treatment 2-3 minute after 100-120 ℃, the backward wherein maintenance water temperature on the rocks of water temperature rising;

(6) flatten and aligning

The aluminum alloy flat tube of extrusion molding is put into oodle maker to be flattened, again the aluminum alloy flat tube that flattens is aligned, the aluminium alloy extrusions that requires aligning without wave, bending, turn round to twist and exist, avoid again by the caused closing in of aligning simultaneously, dehisce, tangerine peel, morpheme dimension overproof and roughness occur.

The fineness of described nano alumina powder is 1-3 nm.

The present invention adjusts the usage ratio of relevant composition in the aluminium prescription, further optimizes filling a prescription, and has added nano alumina powder, copper powder, is conducive to improve the over-all properties of aluminium alloy extrusions; The steps such as anneal, quench treatment, alignment processing have increased the homogeneity of interior tissue of aluminum and the refinement of crystal grain, have greatly improved aluminum alloy flat tube quality and processing characteristics.

Embodiment

The invention will be further described below in conjunction with executing example, but be not limited to the following example.

Embodiment 1

(1) feed proportioning

Get following raw materials in part by weight: aluminium bar 60, aluminium scrap 40, copper powder 3, nano alumina powder 10;

(2) alloy melting

First aluminium ingot, aluminium scrap, copper powder are dropped into smelting furnace and carry out melting, when treating that it becomes molten state, add nano alumina powder, make it uniformly dispersing, then drop into an amount of AlTiB grain-refining agent and carry out refining, at last by degasification, skim assorted slag, gas in the melt effectively removed;

(3) casting

Before the casting melted aluminium liquid was left standstill 20 minutes, the relief hole of aluminium liquid by smelting furnace entered crystallizer through the aluminium groove, cast out needed aluminium billet and get model, be cooled to normal temperature, then as required the sawing of aluminium billet is become certain length;

(4) anneal

Carry out homogenizing annealing after the sawing of aluminium billet and process, detailed process is as follows: be warming up to first under 300 ℃, be incubated 2 hours, per hour 70 ℃ of intensifications are heated to 520 ℃ of lower insulations 6 hours, then air cooling, per hour 60 ℃ of intensifications are heated to 360 ℃ again, and insulation degree 5 hours; Be cooled to again 150 ℃ of lower insulations 3 hours;

(5) extruding

Billet is heated to 420 ℃, is incubated 2 hours, the circle casting extrusion molding from flat tube mould that then utilizes extrusion machine to heat, 450 ℃ of die temperatures, extrusion speed 10 m/min, squeeze pressure 180 kg/N; After the air-cooled section bar surface temperature to 100 ℃, put into 2 ℃ of water and carried out quench treatment 2 minutes, the water temperature backward wherein maintenance water temperature on the rocks that raises;

(6) flatten and aligning

The aluminum alloy flat tube of extrusion molding is put into oodle maker to be flattened, again the aluminum alloy flat tube that flattens is aligned, the aluminium alloy extrusions that requires aligning without wave, bending, turn round to twist and exist, avoid again by the caused closing in of aligning simultaneously, dehisce, tangerine peel, morpheme dimension overproof and roughness occur;

After testing, mechanical property is: tensile strength is 232MPa, and yield strength is 244MPa.

Embodiment 2

(1) feed proportioning

Get following raw materials in part by weight: aluminium bar 70, aluminium scrap 30, nano alumina powder 20, silicon carbide 10, modified Nano ceramic powder 10; Described modified Nano ceramic powder is made by following method: the raw material that takes off the row weight part: after 5 quartz sands, 5 sepiolite powders, 5 celestite powders, 5 olive stone flours, 5 ground dolomites mix 700 ℃ of lower scaling loss 5 hours, then grind to form nanometer powder, it is even to admix the Di(dioctylpyrophosphato) ethylene titanate agitating that is equivalent to powder weight 5% again, oven dry is ground into powder;

(2) alloy melting

First aluminium ingot, aluminium scrap are dropped into smelting furnace and carry out melting, temperature is controlled at 740 ℃, when treating that it becomes molten state, add nano alumina powder and ceramic powder, make it uniformly dispersing, then drop into an amount of AlTiB grain-refining agent and carry out refining, at last by degasification, skim assorted slag, gas in the melt effectively removed;

(3) casting

Before the casting melted aluminium liquid was left standstill 30 minutes, the relief hole of aluminium liquid by smelting furnace entered crystallizer through the aluminium groove, cast out needed aluminium billet and get model, be cooled to normal temperature, then as required the sawing of aluminium billet is become certain length;

(4) anneal

Carry out homogenizing annealing after the sawing of aluminium billet and process, detailed process is as follows: be warming up to first under 320 ℃, be incubated 3 hours, per hour 90 ℃ of intensifications are heated to 550 ℃ of lower insulations 8 hours, then air cooling, per hour 80 ℃ of intensifications are heated to 380 ℃ again, and insulation degree 6 hours; Be cooled to again 180 ℃ of lower insulations 3 hours;

(5) extruding

Billet is heated to 460 ℃, is incubated 3 hours, the circle casting extrusion molding from flat tube mould that then utilizes extrusion machine to heat, 500 ℃ of die temperatures, extrusion speed 15 m/min, squeeze pressure 220 kg/N; After the air-cooled section bar surface temperature to 120 ℃, put into 0 ℃ of water and carried out quench treatment 3 minutes, the water temperature backward wherein maintenance water temperature on the rocks that raises;

(6) flatten and aligning

The aluminum alloy flat tube of extrusion molding is put into oodle maker to be flattened, again the aluminum alloy flat tube that flattens is aligned, the aluminium alloy extrusions that requires aligning without wave, bending, turn round to twist and exist, avoid again by the caused closing in of aligning simultaneously, dehisce, tangerine peel, morpheme dimension overproof and roughness occur;

Mechanical property is after testing: tensile strength is 238MPa, and yield strength is 251MPa.

Claims (2)

1. the production method of an aluminium alloy radiator flat tube is characterized in that, comprises the steps such as feed proportioning, alloy melting, casting, anneal, extruding, pressing and aligning, and concrete steps are as follows:

(1) feed proportioning

Get following raw materials in part by weight: aluminium bar 60-70, aluminium scrap 30-40, copper powder 3-4, nano alumina powder 10-20;

(2) alloy melting

First aluminium ingot, aluminium scrap, copper powder are dropped into smelting furnace and carry out melting, when treating that it becomes molten state, add nano alumina powder, then drop into an amount of AlTiB grain-refining agent and carry out refining, at last by degasification, skim assorted slag, gas in the melt effectively removed;

(3) casting

Before the casting melted aluminium liquid was left standstill 20-30 minute, the relief hole of aluminium liquid by smelting furnace entered crystallizer through the aluminium groove, cast out needed aluminium billet and get model, be cooled to normal temperature, then as required the sawing of aluminium billet is become certain length;

(4) anneal

Carrying out homogenizing annealing after the sawing of aluminium billet processes, detailed process is as follows: be warming up to first under 300-320 ℃, be incubated 2-3 hour, per hour 70-90 ℃ of intensification is heated to 520-550 ℃ of lower insulation 6-8 hour, then air cooling, per hour 60-80 ℃ of intensification is heated to 360-380 ℃ again, and insulation degree 5-6 hour; Be cooled to again 150-180 ℃ of lower insulation 3-4 hour;

(5) extruding

Billet is heated to 420-460 ℃, is incubated 2-3 hour, then utilize extrusion machine that the billet that heats is extruded as the flat tube shape from flat tube mould, die temperature 350-370 ℃, extrusion speed 10-15 m/min, squeeze pressure 180-220 kg/N; Air-cooled flat tube surface temperature is put into 0-3 ℃ of water and was carried out quench treatment 2-3 minute after 100-120 ℃, the backward wherein maintenance water temperature on the rocks of water temperature rising;

(6) flatten and aligning

The aluminum alloy flat tube of extrusion molding is put into oodle maker to be flattened, again the aluminum alloy flat tube that flattens is aligned, the aluminium alloy extrusions that requires aligning without wave, bending, turn round to twist and exist, avoid again by the caused closing in of aligning simultaneously, dehisce, tangerine peel, morpheme dimension overproof and roughness occur.

2. the production method of a kind of novel aluminum alloy aluminium alloy heat radiator flat tube according to claim 1 is characterized in that, the fineness of described nano alumina powder is 1-3 nm.