Die for non-vacuum up-drawing continuous casting production process of copper-chromium-zirconium alloy rod material

Abstract

The utility model belongs to the technical field of metal material preparation and processing, and particularly provides a die for a non-vacuum up-drawing continuous casting production process of a copper-chromium-zirconium alloy rod material, which specifically comprises a graphite die, an embedded ceramic tube and a graphite baffle, an embedded ceramic tube is arranged in the graphite mold; and a graphite baffle is arranged on the outer side of the lower part of the graphite mold. And an asbestos layer is arranged between the outer part of the graphite mold and the graphite baffle. The graphite baffle is internally provided with threads and is in threaded connection with the outer surface of the graphite mold. The die for the non-vacuum up-drawing continuous casting production process of the copper-chromium-zirconium alloy rod material has the beneficial effects that the embedded ceramic tube material can be selected according to different Cr contents, so that the reaction of Cr and C is prevented, and a graphite die can be prevented from becoming rough due to surface reaction in the pull casting process. And component homogenization is realized in a continuous material supplementing form. In addition, by combining optimized process parameters, the surface quality of the continuous casting rod material is bright, and continuous and stable operation of the upward continuous casting process is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the preparation technology of high-performance copper alloy belongs to metal material preparation processing technical field, especially provide a kind of mould for non-vacuum upper drawing continuous casting production process of copper chromium zirconium alloy rod material. BACKGROUND

[0002] Copper chromium zirconium alloy is the ideal material of super large scale integrated circuit lead frame, high-speed rail transit contact wire, electromagnetic gun guide rail, resistance welding electrode and the like due to its high-strength high-conductivity characteristics. However, the existing copper chromium zirconium alloy adopts vacuum melting to obtain ingot, and then obtains rod material product through extrusion or rolling process. The vacuum melting process is low in efficiency and high in energy consumption, cannot be prepared in large scale and continuously, and the prepared ingot is prone to defects such as composition segregation and loose structure, resulting in uneven material structure. Therefore, how to realize non-vacuum continuous casting of copper chromium zirconium is a common problem in the industry.

[0003] Patent CN113736970A utility model discloses a kind of preparation methods of upper drawing continuous casting Cu-Cr-Zr rod, but it still uses vacuum induction melting to obtain Cu-Cr-Zr alloy melt. Patent CN114438355A utility model discloses a kind of composition control method in non-vacuum upper drawing continuous casting process of copper chromium zirconium alloy, but the surface quality of rod material is not described. As can be seen, the process of non-vacuum upper drawing continuous casting copper chromium zirconium alloy is feasible, but Cr and Zr elements are easy to oxidize, and react with graphite crucible and mould, which can increase the viscosity of melt, cause the surface of rod material to be black, and small cracks and other defects. UTILITY MODEL CONTENTS

[0004] In view of the problems pointed out in the above background art, the utility model provides a kind of mould for non-vacuum upper drawing continuous casting production process of copper chromium zirconium alloy rod material.

[0005] The utility model adopts the following technical scheme: a mould for non-vacuum upper drawing continuous casting production process of copper chromium zirconium alloy rod material, specifically comprising: a graphite mould 1, an embedded ceramic tube 2, and a graphite baffle 3.

[0006] The graphite mould 1 has an embedded ceramic tube 2 inside, and the lower part of the graphite mould 1 has a graphite baffle 3 outside.

[0007] The graphite mould 1 and the graphite baffle 3 are connected by a layer of asbestos.

[0008] The embedded ceramic tube 2 is 50-80 mm long and 1-1.5 mm thick, and the graphite baffle 3 has threads inside and is connected to the outer surface of the graphite mould 1 by threads.

[0009] The graphite baffle 3 is 20-30 mm high and 5 mm thick.

[0010] Compared with the prior art, the utility model has the advantages that:

[0011] The graphite mould used in the up-drawing continuous casting process can select the embedded ceramic tube material according to different Cr content, so that the reaction of Cr and C is prevented, and the surface of the graphite mould can be prevented from becoming rough due to the surface reaction during the drawing and casting process. The continuous feeding form is used to realize the composition homogenization. In addition, the optimized process parameters are combined, so that the surface quality of the continuous casting rod material is bright, and the up-drawing continuous casting process is continuously and stably carried out. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a schematic view of the embedded ceramic tube and the outer baffle of the graphite mould;

[0013] The mark in the drawing is explained as follows: 1-graphite mould; 2-embedded ceramic tube; 3-graphite baffle DETAILED DESCRIPTION

[0014] Embodiment 1

[0015] The utility model adopts the following technical scheme: a mould for non-vacuum up-drawing continuous casting production process of copper-chromium-zirconium alloy rod material, specifically comprising: graphite mould 1, embedded ceramic tube 2, graphite baffle 3;

[0016] The graphite mould 1 is internally provided with the embedded ceramic tube 2, and the lower outer side of the graphite mould 1 is provided with the graphite baffle 3.

[0017] The graphite mould 1 is externally provided with the asbestos layer between the graphite baffle 3.

[0018] The embedded ceramic tube 2 has a length of 50mm and a wall thickness of 1mm, and the graphite baffle 3 is internally provided with threads and is threadedly connected to the outer surface of the graphite mould 1.

[0019] The graphite baffle 3 has a height of 20mm and a thickness of 5mm.

[0020] According to the weight percentage content, Cr: 0.4%, Zr: 0.1% and the balance of electrolytic copper are respectively taken. The electrolytic copper is added into a smelting furnace, the calcined charcoal and graphite phosphorus sheet are added, the nitrogen gas is filled into the surface of the graphite phosphorus sheet as a protective gas, heating is carried out to 1200 DEG C to completely melt, then heating is carried out to 1300 DEG C to add chromium sheet, heat preservation is carried out for 20 min, cooling is carried out to 1250 DEG C, then Cu-40Zr alloy is added;

[0021] Before the up-drawing continuous casting, the improved embedded ceramic tube graphite mould is installed at the bottom of the water-cooled copper jacket, the asbestos and graphite protective sleeve are installed outside the mould, then the mould is installed on the traction machine frame, the head of the stainless steel traction rod is connected with the pure copper head, the head is put into the crystallizer, and the head is exposed outside the graphite mould by 15mm. After the installation is completed, the water cooling system is opened, the water temperature is set to 16 DEG C, and the cooling water pressure is 2.5MPa.

[0022] Upward continuous casting: the crystallizer is lowered to 50mm below the melt surface, the traction device is turned on, and the traction parameters are set as follows: the drawing temperature is 1250℃, the pitch is 6mm, the stop ratio is 55%, and the traction speed is 240mm / min. At the same time, the servo motor automatic wire feeding is turned on, and the wire feeding speed is: Cr: 2.5g / min, Zr: 2g / min.

[0023] Example 2

[0024] The utility model adopts the following technical scheme: a mould for non-vacuum upward continuous casting production process of copper-chromium-zirconium alloy rod material, specifically comprising: graphite mould 1, embedded ceramic pipe 2, graphite baffle 3;

[0025] The graphite mould 1 is internally provided with the embedded ceramic pipe 2, and the lower outer side of the graphite mould 1 is provided with the graphite baffle 3.

[0026] The graphite mould 1 is externally provided with the asbestos layer between the graphite baffle 3.

[0027] The embedded ceramic pipe 2 has a length of 80mm and a wall thickness of 1.5mm, and the graphite baffle 3 is internally provided with threads and is threadedly connected to the outer surface of the graphite mould 1.

[0028] The graphite baffle 3 has a height of 30mm and a thickness of 5mm.

[0029] According to the weight percentage content, Cr: 1.0%, Zr: 0.1% and the balance of electrolytic copper are respectively taken. The electrolytic copper is added into a smelting furnace, the calcined charcoal and graphite phosphorus sheet are added, nitrogen gas is filled on the surface of the graphite phosphorus sheet as a protective gas, heating is performed to 1200℃ to completely melt, then heating is performed to 1350℃ to add chromium sheet, heat preservation is performed for 20min, cooling is performed to 1250℃ to add Cu-40Zr alloy.

[0030] Before upward continuous casting, the improved embedded ceramic pipe graphite mould is installed at the bottom of the water-cooled copper jacket, the ceramic pipe has a length of 70mm and a wall thickness of 1mm, the graphite baffle is additionally arranged at the bottom of the mould, the baffle is internally provided with threads and is threadedly embedded with the outer surface of the graphite mould, the baffle has a height of 30mm and a thickness of 5mm, the asbestos and graphite protective sleeve are installed outside the mould, and then the whole is installed on the traction machine frame from top to bottom, the stainless steel traction rod head is connected with the pure copper head, is placed into the crystallizer, and the head is exposed outside the graphite mould by 15mm. After installation is completed, the water cooling system is turned on, the water temperature is set to 14℃, and the cooling water pressure is 2.5MPa.

[0031] Up-drawing continuous casting: the mold was put down to 50 mm below the liquid surface of the melt, the traction device was started, and the traction parameters were set as follows: the traction temperature was 1260 ℃, the pitch was 6 mm, the stop ratio was 75%, and the traction speed was 105 mm / min. At the same time, the servo motor automatic wire feeding was started, and the wire feeding speed was as follows: Cr: 2.5 g / min, Zr: 2 g / min.

Claims

1. A mould for non-vacuum upward continuous casting production process of copper-chromium-zirconium alloy rod, characterized in that: The mold for the non-vacuum up-drawing continuous casting production process of the copper-chromium-zirconium alloy rod material specifically comprises a graphite mold (1), an embedded ceramic tube (2), and a graphite baffle (3). The graphite mold (1) is internally provided with the embedded ceramic tube (2), and the lower outer side of the graphite mold (1) is provided with the graphite baffle (3).

2. The mold for non-vacuum upward continuous casting production process of copper-chromium-zirconium alloy rod material according to claim 1, characterized in that, The graphite mold (1) is externally provided with an asbestos layer and the graphite baffle (3).

3. The mold for non-vacuum upward continuous casting production process of copper-chromium-zirconium alloy rod material according to claim 1, characterized in that, The embedded ceramic tube (2) has a length of 50-80 mm and a wall thickness of 1-1.5 mm, and the graphite baffle (3) is internally provided with threads and is threadedly connected to the outer surface of the graphite mold (1).

4. The mold for non-vacuum upward continuous casting production process of copper-chromium-zirconium alloy rod material according to claim 1, characterized in that, The graphite baffle (3) has a height of 20-30 mm and a thickness of 5 mm.

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