TWI244955B - Method for joining a rigid alloy to a steel material - Google Patents

Abstract

Disclosed is a method for joining a rigid alloy to steel material, capable of overcoming the shortcomings of being unable to join a large area or having insufficient joining strength due to the significant difference in their rigidities and linear expansion coefficients. In this invention, an amorphous material is first placed in the interface between the rigid alloy and the steel material. The sub-assembly is then placed in a vacuum furnace to heat and join the materials. The joined sub-assembly is then subject to heat treatment so as to enhance mechanical strength of the material.

Description

1244955 A7 B7 V. Description of the invention () (Please read the precautions on the back before filling out this page) The present invention is the only joining method, especially a joining method of a large area of hard metal and steel. Most of the tools of the machine tool are welded with a high hardness alloy to one end of the steel, so that the high hardness alloy can process the workpiece. Such a tool must have high bonding strength, otherwise the high hardness alloy will fall off after a long time machining of the tool. Generally, the steel and the high-hardness alloy are joined by forming the steel and the high-hardness alloy in a predetermined shape in advance, and then brazing them together. The procedure for brazing is: firstly apply 10 wipes of solder (usually silver-based solder or copper-based solder) between the joint surfaces of the two, and then use a jig to initially fix the two and send them to a vacuum furnace. heating. After the vacuum furnace is heated to a predetermined temperature and time to melt the solder, the heating is stopped and the workpiece is cooled at this time. After cooling, the high-hardness alloy will be firmly bonded to the steel. The aforementioned brazing method can only be applied to the joining of small-area joining materials, and the 15 high-hardness alloy can only select alloys with a hardness lower than HRA 87. The reasons are as follows: Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and the Industrial Cooperative Cooperative, in general, high-hardness alloys have a lower coefficient of linear expansion (generally about 5 to 6xl (r6 m / ° c), The coefficient of linear expansion is relatively large (generally about 10.5 ~ 11 \ 10_6111 / ° 〇. During the cooling process of brazing, due to the different shrinkage of the two workpieces, a shear force will be generated in the hard material, making the two Therefore, in order to reduce the influence of the joint strength caused by the shear force generated in the solder due to the different expansion coefficients of the two joint materials, the joint strength can only be applied to small-area joints, or a lower hardness is selected. Alloy to reduce the difference in linear expansion coefficient between steel and cemented carbide to reduce the aforementioned effects. However, -3- This paper size applies the Chinese National Standard (CNS) Λ4 specification (210 × 297 mm)

Claims (1)

1244955 S D8 々 Application scope 1. A method for joining cemented carbide and steel, including the following steps: 1. Cleaning a cemented carbide and a steel joint surface with a solvent; 2. An amorphous material The sheet is placed between the cemented carbide and the 5 joint surface of the steel, and the cemented carbide and the steel are fixed in advance; 3. heating to melt the amorphous material sheet; 4. cooling the cemented carbide, the steel, and The amorphous material solidifies the amorphous material to combine the steel material and the amorphous material, and heat-treats the cemented carbide, the steel material, and the amorphous material. 10 2. The method for joining cemented carbide and steel according to item 1 of the scope of the patent application, wherein the second step further includes cutting the amorphous material sheet into a joining surface with the cemented carbide and the steel About the same shape and area. 3. According to a method for joining cemented carbide and steel 15 according to item 1 of the scope of the patent application, the second step (2) further includes installing a copper foil on each side of the amorphous material sheet body. Printed by the Consumers' Cooperative of the Ministry of Intellectual Property Bureau 4. According to a method of joining cemented carbide and steel described in item 1 of the scope of patent application, the thickness of the amorphous material sheet is 0.02 legs to 0.05 mm ° 20 5. A method for joining cemented carbide and steel according to item 3 of the scope of the patent application, wherein the thickness of the copper foil is 0.02 legs to 0.05 legs. 6. A method for joining a cemented carbide and a steel material according to item 1 of the scope of the patent application, wherein in the first step, the cemented carbide and the steel material are further drilled or tapped. -10- This paper size applies to Chinese national standards (CNS > A4 is now available (210X297 cm)