High temperature brazing method between multiple hard alloy slices and strip stainless steel tool body
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A technology of cemented carbide and brazing method, applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve the problems of welding strength, welding bending deformation and correction, and achieve good quality and efficiency of brazing High, high-strength effects
Inactive Publication Date: 2015-07-29
HENAN POLYTECHNIC UNIV
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[0003] The purpose of the present invention is to provide a high-temperature brazing method between a multi-piece hard alloy and a long stainless steel cutter body ai
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Embodiment 1
[0032] Brazing of three pieces of hard alloy and stainless steel tool holder: using figure 1 The fixture shown is fixed, and brazed with SX2-12-11G box-type protective atmosphere furnace as a whole. The specific steps are as follows:
[0033] a. The model of tool holder is 1Cr18Ni9Ti austenitic stainless steel, the shape is 6×30×135 rectangle, and the hard alloy is YG8 hard alloy for testing, and the size of each hard alloy is 3×12×45;
[0034] b. The weight percentage of sheet solder is: Ag 45%, Cu 30%, and the balance is Zn; the transition layer metal is 1J50 alloy foil with a thickness of 0.05mm, and the type of solder is QJ-308. Check the appearance quality of the raw materials ;
[0035] c. Use sandpaper to grind off the oxide film on the surface of 1Cr18Ni9Ti stainless steel and hard alloy to improve the quality of welding;
[0036] d. Clean and dry the surface of each material, solder and transition layer with alcohol after grinding. Apply the flux evenly on the tool...
Embodiment 2
[0042] Brazing of eight pieces of hard alloy and stainless steel tool holder: the hard alloy is YG8 hard alloy, of which the size of 4 pieces of large hard alloy is 3×22×45, and the size of 4 pieces of small hard alloy is 3× 10×45, weldments such as figure 2 As shown, use the SX2-12-11G box-type protective atmosphere furnace to heat and braze as a whole. The specific steps are as follows:
[0043] a. The tool holder is made of 304 austenitic stainless steel, and the hard alloy is made of YG8 hard alloy for the test;
[0044] b. The weight percentage of sheet solder is: Ag 45%, Cu 30%, and the balance is Zn; the transition layer metal is 1J50 alloy foil with a thickness of 0.05mm, and the type of solder is QJ-308. Check the appearance quality of the raw materials ;
[0045] c. Use sandpaper to grind off the oxide film on the surface of 304 stainless steel and hard alloy to improve the quality of welding.
[0046] d. Clean and dry the surface of each material, solder and tra...
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Abstract
The invention relates to a high temperature brazing method between multiple hard alloy slices and a strip stainless steel tool body. 304 stainless steel, hard alloy and sheet-shaped brazing filler metal are prepared, wherein transition layer metal is clamped in the middle of the sheet-shaped brazing filler metal; oxide layers on the surfaces of a stainless steel tool rest, the hard ally and the brazing filler metal are removed by abrasive paper; a brazed surface, the brazing filler metal and the transition layer alloy are cleaned by acetone; then brazing flux is coated on faces to be connected of the tool rest and the hard alloy slices; the brazing filler metal is placed between the steel tool rest and the hard alloy; each slice of hard alloy is respectively fixed on the tool rest by a fixture and then is placed into a closed box-type furnace filled with industrial argon to be heated and subjected to heat preservation; then the hard alloy is cooled to the room temperature with the furnace; workpieces are taken out; the fixtures are disassembled. A great number of alloy slices exist, the strip tool body is bent and deformed due to different coefficients of thermal expansion after welding and cold-pressed rectification on deformation can crush the hard alloy slices, and thus, a welded tool is heated to 450 DEG C, is subjected to heat preservation for 5 minutes, is directly taken out and is hot-pressed to eliminate welding deformation so as to obtain the product with a regular shape and high connection intensity.
Description
technical field [0001] The invention relates to a high-temperature brazing method between a plurality of hard alloys and a long stainless steel cutter body. Background technique [0002] Cemented carbide has high hardness, strength, wear resistance and corrosion resistance. It is often used in the manufacture of cutting tools, knives, cobalt tools and wear-resistant parts. However, cemented carbide is brittle and cannot be cut, so it is difficult to make The integral tool with complex shape is often made into blades of different shapes, which are installed on the tool body or mold body by welding, bonding, mechanical clamping and other methods. The cutter body is usually made of medium carbon steel, high-strength steel and stainless steel. Stainless steel tool holders are suitable for use in environments requiring corrosion resistance, such as tools used in mines and in the field. Brazing uses solder with a lower melting point. After heating, the solder melts but the workp...
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