JPS6023912B2 - Manufacturing method of aluminum brazing sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an aluminum plating sheet, and in particular improves the adhesion of the cladding between an AI or mountain alloy core material and an AI alloy brazing skin material, thereby eliminating defects such as blowholes and peeling. This prevents the occurrence.

Generally, aluminum plating sheet is made of pure N(10
50), AI-Mn alloy (3003, 3203), N
-Mn-Mg alloy (3005, 3105), AI-M
Using g-Si alloy (6951, 6063) etc. as the core material,
N-Si alloy (4343, 404) on one or both sides.
5), AI alloy brazing material such as Yamaichi Si-Mg alloy (4004, 4104) is joined at a coverage rate of 3 to 40% per side, and after cladding by hot rolling, it is rolled to a predetermined thickness. It is made by cold rolling, and the coverage ratio when cladding is done by hot rolling does not change with subsequent rolling.

For the cladding of the core village and the skin village, after hot-rolling the river alloy wax block into a plate with a thickness of 10 to 6 ribs, the surface is the same as that of the rust block for the core village using a planer etc. Cut to size to form a skin material, degrease the surface of this skin material and the core material zentama with a solvent, and then join the skin material to one or both sides of the core material sengo,
After fixing with an iron band or the like, it is heated to a temperature of about 500 qo to perform hot rolling.

However, when heated for hot rolling, the skin material and core material naturally oxidize, and the skin material in particular becomes S
Because it contains a large amount of i and Mg, it undergoes significant oxidation and its surface becomes black and powdery. Even if this is hot-rolled, a good cladding cannot be obtained, and partial adhesion failure occurs, which causes a high rate of defects such as blowholes and peeling during annealing after rolling. In view of this, as a result of various studies, the present invention has been developed to improve the adhesion between the core material and the skin material in the cladding by coating the joint surface of the cladding AI alloy brazing material in advance with an N alloy that is thinner and softer than the skin material. As a result of further investigation, we developed a method for producing aluminum plating sheets with fewer defects such as blowholes and peeling after cold rolling. A method in which the N-alloy solder skin material for the sheet is bonded to one or both sides of the core material at a coverage rate of 3 to 40% per side, which is clad by hot rolling, and then cold rolled to a predetermined thickness. In this step, AI or AI alloy of higher quality than the skin material is bonded to both sides of the nail alloy brazing material at a coverage rate of 1 to 20% per side and clad by hot rolling, and the cladding material is used as the core material. It is characterized in that it is bonded to one or both sides of and clad by hot rolling.

That is, in the present invention, a brazing filler metal for aluminum plating sheets having the composition shown in Table 1 is hot-rolled to a predetermined thickness to form a skin material, and a skin material is coated on both sides of the brazing material with a soft material from the skin material. AI or A] Alloy plates are joined and clad by hot rolling. Next, this cladding material is bonded to one or both sides of an AI or AI alloy core material for an aluminum plating sheet having the composition shown in Table 2, and cladding is performed by hot rolling. AI or AI alloy plate with a higher quality than skin material is produced by hot rolling a grand ingot of pure N or N-Mn alloy (30033203) to a specified plate thickness, and produces an AI alloy solder for aluminum plating sheet. AI or AI cut to the same size as the surface of the block, and after degreasing this and the surface of the N alloy wax Zentama with a solvent, cut into both sides of the said Sentama.
The alloy plates are joined and fixed with iron bands, etc., and approximately 5000
The product is heated to a temperature of 0 and clad by hot rolling.

The purpose of coating both sides of the AI alloy brazing material with AI or AI alloy, which is more sensitive than the skin material, is to prevent surface oxidation of the skin material due to heating when the core material and the brazing material are rolled together. be. This coverage is 1 to 20% per side, preferably 1 to 10%
Even if the coverage is less than 1% or more than 20%, cladding by hot rolling becomes difficult. Especially for double-sided cladding, pure N is placed on top of the AI alloy solder as a plating sheet.
Otherwise, the N alloy will be coated, and if this thickness exceeds 3 mm, the brazing properties will deteriorate, so it is necessary to desirably reduce the thickness to 1 mm or less, and the thickness of the sheet used should be 0.16 to 3 mm. Assuming a proboscis, the coverage needs to be 20% or less, preferably 10% or less. In addition, the coverage rate of the N alloy brazing material clad on one side of the mountain or AI alloy core material is 3 to 3 per side.
It may be set to 40%.

Table 1 Table 2 The present invention will be described in detail below with reference to Examples.

Using a coin block made of AI alloy brazing material with the composition shown in Table 3 (thickness: 30 mm, medium: 90 mm, length: 150 mm), both sides of it were faceted to a thickness of 280 mm. After degreasing with a solvent, a board with a diameter of 85 m and a length of 140 m, cut out from pure AI board (1050) of various thicknesses, was degreased with a solvent and then stacked together to form a 500 qo sheet. It was hot rolled at a temperature of 36 mm to a thickness of 36 mm, and pure aluminum was clad on both sides of the brazed mountain alloy plate. A board measuring 100 m in length and 300 m in length was cut out from this to form a skin material for a plating sheet, and both sides of the board were degreased with a solvent. On the other hand, AI with the composition shown in Table 3
After soaking the alloy key block, it is face-milled to form a core material with a thickness of 287 pieces, a middle of 112 ribs, and a length of 330 ribs, the surface is degreased with a solvent, and the skin material is applied to one or both sides of the core material. Superposition, 5
A clad plate was obtained by hot rolling at a temperature of 00qC to a thickness of IQ, and this was cold rolled to produce a plating sheet having a thickness of 1.2 ribs. For comparison, a skin material was formed on both sides of an AI alloy brazing plate without cladding with pure AI, and this was superimposed on both sides of the core material and cladding was performed by hot rolling. 1.2 praising seats were manufactured.

10 medium-sized, 2-h long test pieces were randomly taken from these plating sheets, and after being slowed at a temperature of 360 pm for 2 hours, they were visually inspected to see if there were any blowholes or peeling. The defective rate was evaluated from

In addition, a test piece of 25 medium diameter and 6 length was cut out from the praising sheet, and it was vertically contacted with a 3003 sheet (thickness 1 side, medium 4 length, length 6 ribs) held horizontally. A so-called inverted T-shaped joint was made, and after prescribed treatment, brazing properties were evaluated from the condition of the fillet when brazed under the following conditions. These results are also listed in Table 3. In the evaluation of the defective rate in the table, if even one blowhole or peeling occurred, it was judged as defective.

For evaluation of brazing properties, those with good solder flow and fillet formation were marked with ◯, those with slight unevenness were marked with △, and those with non-uniformity were marked with x. The brazing conditions are N-
For those using Si-based alloy brazing, flux brazing was performed at a temperature of 60,500° C. for 3 minutes using a 60% aqueous solution as the flux. Further, those using an N-Si-Mg based alloy solder were vacuum brazed, and the brazing was carried out in a vacuum of 5 x 10-5 Torr at a temperature of 59yo for 3 minutes. Further mountain-S
For those using i-Bi-Be alloy brazing, inert gas brazing was carried out in N2 gas of 75 orr at a temperature of 600 o'clock for 3 minutes. Table 3 (Note) All values for brazing filler metal and core material indicate wt*.

Claims (1)

[Claims] 1. An Al alloy solder skin material for the sheet is bonded to one or both sides of an Al or Al alloy core material for an aluminum brazing sheet at a coverage rate of 8 to 40% per side, and after cladding by hot rolling, a predetermined shape is formed. In the method of cold rolling to a thickness of . A method for producing an aluminum brazing sheet, which comprises joining the cladding material to one or both sides of a core material and cladding by hot rolling.