CN113430518A

CN113430518A - Direct melting forming process for glass-coated copper superfine wire

Info

Publication number: CN113430518A
Application number: CN202110701477.2A
Authority: CN
Inventors: 罗奕兵; 谢炜; 仝永刚; 余小峰; 曹太山; 彭伟杰
Original assignee: Changsha University of Science and Technology
Current assignee: Changsha University of Science and Technology
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2021-09-24

Abstract

A glass coated copper ultramicro wire direct fusion forming process, the section structure of the glass coated copper ultramicro wire is composed of a glass coating layer and a core wire copper layer, the outer diameter of the ultramicro wire is 0.005-0.05 mm, and the glass thickness is not less than 0.002mm and not more than 0.01 mm; the transition temperature of the glass is 50-100 ℃ lower than the melting point of the core wire copper layer metal, the heating temperature of the molten glass is 100-150 ℃ higher than the melting point of the core layer metal, the relative pressure of the glass liquid surface is 0-0.05MPa, and the relative pressure of the metal liquid surface in the metal liquid melting pipe is 0-0.07 MPa; the linear speed of the filament collecting device for collecting filaments is 0.2-5m/s, and the cooling mechanism adopts an air cooling or water mist cooling mode.

Description

Direct melting forming process for glass-coated copper superfine wire

Technical Field

The invention relates to a forming process of metal composite micro-wires, in particular to a direct melting forming process of glass-coated copper ultra-micro-wires.

Background

With the development of the electronic and electrical industry, higher and higher requirements are put on the ultra-micro metal guide wire, such as: small diameter, high strength, high corrosion resistance, high temperature resistance, high radiation resistance, high insulating property and the like. It is difficult to prepare metal microfilaments with a diameter of less than twenty microns by conventional plastic forming methods. In recent years, glass-coated metal microfilaments prepared by a melt spinning method can realize preparation of microfilaments with micron-level diameters, but are limited by the suspension force of a magnetic field and poor stability of a molten metal pool, the fluctuation of the external diameter of the microfilament and the diameter of a core wire is large, continuous production cannot be realized in production, and the requirement of the electronic industry on the performance of ultramicro guide wire products is difficult to meet.

Disclosure of Invention

The invention provides a direct melt forming process of glass-coated copper superfine wires, aiming at the defects of the production of the melt spinning glass-coated copper superfine wires.

The technical principle of the direct melting forming process of the glass-coated copper ultramicro wire is that glass core wire copper and coated glass are respectively melted in a metal melting tube and a glass melting crucible, the metal melting tube is a variable cross-section tube with openings at two ends and is arranged in a glass melting pool, a tapered hole is arranged in the glass melting crucible, a template with a micropore is arranged outside the tapered hole of the glass melting crucible, molten glass and metal are led out by a wire drawing device, and the glass and the metal are compounded in the micropore, cooled by a cooling mechanism and wound into a glass-coated copper ultramicro wire reel.

The section structure of the glass-coated copper ultramicro wire consists of a glass coating layer and a core wire copper layer, the outer diameter of the glass-coated copper ultramicro wire is 0.005-0.05 mm, the material of the coating layer is glass, and the thickness of the glass coating layer is not less than 0.002mm and not more than 0.01 mm.

Further, the core wire copper layer is made of industrial pure copper or copper alloy;

the wire drawing device adopts a glass rod, and the diameter of the tip of the glass rod is not more than the outer diameter of the produced glass-coated copper ultramicro wire;

the metal melting tube extending into the tip of the glass melting bath in the figure 1 is in a conical structure, the difference value between the conical vertex angle of the tip of the metal melting tube and the vertex angle of the conical hole of the glass melting crucible is +/-1 degree, the inner diameter of the hole of the tip of the metal melting tube is not more than 1mm, the depth of the tip of the metal melting tube extending into the conical hole of the glass melting crucible is not less than 2mm, and the annular single-side gap between the conical shape of the tip of the metal melting tube and the conical hole of the glass melting crucible is 0.5-1 mm; the height of the ultramicro-filament forming micropore of the template is 0.5-1 mm.

Further, the glass transition temperature of the glass is 50-100 ℃ lower than the melting point of the metal of the core wire copper layer; when the glass is in a stable working state, the heating temperature of the molten glass is higher than the melting point of the core layer metal by 100-200 ℃, the relative pressure of the liquid surface of the molten glass is 0-0.05MPa, the relative pressure of the liquid surface of the metal liquid melting pipe is 0-0.07MPa, and the liquid surface of the metal is protected by protective gas; the linear speed of the filament collecting device for collecting filaments is 0.2-5m/s, and the cooling mechanism adopts an air cooling or water mist cooling mode.

The invention has the advantages that:

1) compared with a melt spinning method, the influence of metal falling caused by suspension force change is not required to be considered, the stability of a molten pool is high, the diameter of the microfilament is controlled by adopting the template micropores, and the diameter is constant;

2) the production efficiency is improved, the quality of the molten metal is strictly limited due to the limitation of the suspension force in the melt spinning method, and continuous production cannot be realized;

3) the middle part of the flexible pipe is connected with a protective origin through a connecting joint, so that the molten metal can be prevented from being oxidized;

4) the side surface is provided with the template, so that the wire drawing operation is more convenient;

5) by additionally arranging the template micropores, the metal melting pipe, the wire collecting device and the cooling mechanism, the simultaneous production of multiple wires can be conveniently realized.

Drawings

FIG. 1 is a schematic representation of the forming process principle of the present invention. In the figure, (1) is a glass melting crucible; (2) the heating system comprises a heating element and an accessory; (3) is molten glass; (4) is molten glass; (5) the metal melting pipe is a variable cross-section bent pipe with openings at two ends; (6) a glass melting crucible; (7) a ball valve or a gate valve is adopted as a stop valve; (8) is a connecting joint 2; (9) the system is a constant pressure system, the working pressure range of the system is 0-0.1MPa relative pressure, and the pressure of the metal liquid level and the pressure of the molten glass liquid level are respectively and independently controlled; (10) is a flexible tube; (11) the micro-holes are used as templates and are processed by laser; (12) glass-coated metal ultramicro-wires; (13) the wire winding mechanism is realized by driving a wire winding reel by a motor, the wire winding device is arranged below the template, the wire winding reel can move repeatedly in one direction, and the moving direction of the wire winding reel is vertical to the axial direction of the template die hole; (14) the cooling mechanism is realized in an air cooling or water mist cooling mode and is arranged below the side of the die hole of the template.

Detailed Description

EXAMPLE 1 glass-coated pure copper ultra-micro wire Forming Process

The outer diameter of the glass coated copper ultramicro wire is 0.005-0.05 mm, the coating layer is made of glass, the thickness of the glass coating layer is 0.002-0.01mm, and the core wire copper layer is made of industrial pure copper;

the difference value between the conical vertex angle of the tip end of the metal melting tube and the vertex angle of the conical hole of the glass melting crucible is +/-0.2 degrees, the inner diameter of the hole of the tip end of the metal melting tube is 0.5 mm, the depth of the tip end of the metal melting tube extending into the conical hole of the glass melting crucible is not less than 3 mm, and the annular single-side gap between the conical shape of the tip end of the metal melting tube and the conical hole of the glass melting crucible is 1 mm. The transition temperature of the glass is 50-80 ℃ lower than the melting point of the metal of the copper layer of the core wire; the heating temperature of the molten glass is higher than the melting point of the core layer metal by 100-150 ℃, the working pressure of the glass liquid surface of the glass melting crucible is 0.04-0.05MPa, the pressure of the metal liquid surface in the metal liquid melting tube is 0.03-0.06 MPa, and the metal liquid surface is protected by nitrogen; the linear speed of the filament collecting device is 0.2-0.8 m/s, and the cooling mechanism adopts an air cooling mode.

Claims

1. A glass coated copper ultramicro wire direct fusion forming process, the section structure of the glass coated copper ultramicro wire is composed of a glass coating layer and a core wire copper layer, the outer diameter of the glass coated copper ultramicro wire is 0.005-0.05 mm, the material of the coating layer is glass, the thickness of the glass coating layer is not less than 0.002mm and not more than 0.01mm, and the material of the core wire copper layer is industrial pure copper or copper alloy;

the method is characterized in that glass and core wire metal are respectively heated into liquid in a glass melting crucible and a metal melting tube, two ends of the metal melting tube are opened, one end of the metal melting tube extends into the lower part of the molten glass, continuous through holes are arranged on the side surface of the glass melting crucible and an external template, molten metal and molten glass are led out from the continuous through holes, and then cooling and composite forming are carried out on the microfilaments;

the forming process parameters are that the heating temperature of the molten glass is higher than the melting point of the core layer metal by 100-200 ℃, the relative pressure of the liquid surface of the molten glass is 0-0.05MPa, the relative pressure of the liquid surface of the metal liquid melting pipe is 0-0.07MPa, and the liquid surface of the metal is protected by protective gas; the linear speed of the filament collecting device for collecting filaments is 0.2-5m/s, and the cooling mechanism adopts an air cooling or water mist cooling mode.

2. The glass according to claim 1, wherein the glass has a transition temperature of 50 to 100 ℃ lower than the melting point of the metal of the core wire copper layer.

3. The metal melting tube as set forth in claim 1, wherein the metal melting tube has a tapered configuration extending into the tip of the glass melting bath, the difference between the apex angle of the taper of the metal melting tube tip and the apex angle of the tapered hole of the glass melting crucible is ± 1 °, the inner diameter of the hole of the metal melting tube tip is not more than 1mm, the depth of the metal melting tube tip extending into the tapered hole of the glass melting crucible is not less than 2mm, and the annular one-sided gap between the taper of the metal melting tube tip and the tapered hole of the glass melting crucible is 0.5 to 1 mm.

4. The template of claim 1, wherein the height of the microwire-forming pores of the template is from 0.5 to 1 mm.