CN-121972633-A - Production method of copper-aluminum composite material

CN121972633ACN 121972633 ACN121972633 ACN 121972633ACN-121972633-A

Abstract

The invention discloses a copper-aluminum composite material production method, which comprises the following steps of placing a pretreated copper plate into a preheating furnace for preheating, lifting and transferring the preheated copper plate to a supporting platform in a crystallizer by using a lifting appliance, pouring aluminum liquid after injecting argon gas and discharging air, starting a dummy ingot system for continuous pouring after an initial solidified shell reaches a preset thickness, gradually reducing the flow of the aluminum liquid when the length of an ingot is close to a target value, and properly reducing the downward moving speed of the supporting platform.

Inventors

FAN YANFU
FU LIQIANG
WANG HUI
XIA YUNXIAO
DING YONGBIN
GUO HAOJIE

Assignees

洛阳铜一金属材料发展有限公司

Dates

Publication Date: 20260505
Application Date: 20260403

Claims (5)

1. The production method of the copper-aluminum composite material is characterized by comprising the following steps of: s1, placing a pretreated copper plate into a preheating furnace, and heating to 300-450 ℃ to reduce the temperature difference with aluminum liquid and prevent the aluminum liquid from forming a cold interlayer when meeting cold flash set; S2, vertically lifting the preheated copper plate by using a lifting appliance, moving the copper plate to a proper position right above the crystallizer, and keeping the copper plate in a clamping and stabilizing device; S3, starting a clamping device to enable the fixed clamping roller (6) of the upper group and the floating clamping roller (71) of the lower group to lightly touch the surface of the copper plate, and applying constant pretightening force; S4, slowly lowering the copper plate until the bottom of the copper plate stably falls on a supporting platform in the crystallizer, wherein at the moment, the dead weight of the copper plate is borne by the supporting platform, both the fixed clamping roller (6) and the floating clamping roller (71) play a role in righting and guiding, and then initial readings of the corresponding pressure sensors (72) of the two floating clamping rollers (71) at the moment and zero positions of the angular speed sensors (61) on the fixed clamping roller (6) are recorded and used as reference data for subsequent monitoring; S5, spraying argon to a liquid level area in the crystallizer, and exhausting air to reduce the generation of aluminum liquid oxidized skin; S6, injecting aluminum liquid into the crystallizer at a low flow rate through a launder, wherein the aluminum liquid contacts the preheated copper plate and a supporting platform at the bottom of the crystallizer, and is quickly solidified under the action of cooling water around the crystallizer to form a closed bottom support, so that the bottom of the copper plate is firmly wrapped and fixed; s7, starting a dummy ingot system after an initial solidified shell reaches a preset thickness, starting to slowly move downwards at a set speed by a supporting platform to perform continuous casting, controlling a floating clamping roller (71) to perform periodic up-down reciprocating motion in the casting process, simultaneously detecting pressure change in real time by a pressure sensor (72), if a copper plate slightly inclines under the impact of aluminum liquid, pressing the floating clamping roller (71) on one side by the copper plate to cause the reading of the side pressure sensor (72) to rise and the reading on the opposite side to be reduced, and sending an alarm to prompt the reduction of the casting speed once the pressure difference on two sides exceeds a set threshold value by the control system, and automatically correcting the copper plate by utilizing the static pressure difference of the aluminum liquid; S8, when the length of the cast ingot is close to a target value, gradually reducing the flow of the aluminum liquid, and properly reducing the downward moving speed of the supporting platform, after stopping downward moving, continuously maintaining the small flow to pour for a short period of time, and utilizing the static pressure of the aluminum liquid at the upper part to carry out liquid feeding on a micro gap generated by solidification shrinkage at the lower part so as to ensure the compactness of the aluminum layer at the top area of the copper plate; S9, closing the launder, stopping the injection of the aluminum liquid, and thus completing the production of the copper-aluminum composite ingot.
2. The method for producing the copper-aluminum composite material according to claim 1, wherein in S2, the clamping device comprises a base (1), a track groove is formed in the base (1), a mounting frame (3) is arranged in the track groove in a sliding mode, a sliding groove (31) is formed in the side face of the mounting frame (3), a top plate (4) and a bottom plate (42) are arranged in the sliding groove (31) in a sliding mode, the middle of the top plate (4) is connected with the middle of the bottom plate (42) through a vertical electrohydraulic push rod (41), an upper sliding block (5) is arranged in the horizontal sliding groove in the side face of the top plate (4) in a sliding mode, a fixed clamping roller (6) is arranged on the side face of the upper sliding block (5) in a rotating mode, an angular speed sensor (61) for detecting the rotation angle or the rotation speed of the fixed clamping roller (6) is arranged in the upper sliding block (5), a lower sliding block (7) is arranged in the horizontal sliding groove in the side face of the bottom plate (42), a floating clamping roller (71) is arranged in the side face of the electrohydraulic sliding groove in a sliding mode, the side face of the electrohydraulic sliding mechanism (7) is arranged on the side face of the lower sliding groove, the side face of the electrohydraulic sliding roller (4) and the side face of the bottom plate (42) is provided with a horizontal push rod (8) respectively, the upper sliding roller (8) and the lower sliding roller (7) are respectively connected with the horizontal sliding roller (8) and the horizontal sliding roller (7), for detecting in real time the lateral pressure exerted by the floating nip roller (71).
3. The method for producing the copper-aluminum composite material according to claim 2, wherein one end of the base (1) is provided with a horizontal servo motor (2), an output shaft of the horizontal servo motor (2) is provided with a horizontal screw rod (21) through a coupler, the horizontal screw rod (21) is in threaded connection with a threaded hole at the bottom of the mounting frame (3) and is used for driving the mounting frame (3) to horizontally move along a track groove of the base (1), the top of the mounting frame (3) is provided with a longitudinal servo motor (32), an output shaft of the longitudinal servo motor (32) is provided with a longitudinal screw rod (33) through the coupler, and the longitudinal screw rod (33) is in threaded connection with a threaded hole in the middle of the top plate (4) and is used for driving the top plate (4) to longitudinally lift along a sliding groove (31) of the mounting frame (3).
4. The method for producing copper-aluminum composite material according to claim 3, wherein in S7, after the dummy ingot system works, an angular velocity sensor (61) detects the rotation angle of the fixed clamping roller (6) in real time, and converts the angle change in unit time into a linear velocity to detect whether the downward moving velocity of the copper plate is consistent with the downward moving velocity of the supporting platform.
5. The method of producing copper-aluminum composite material according to claim 4, wherein in S7, after the dummy ingot system is operated, the floating clamping roller (71) is controlled to periodically reciprocate up and down by the vertical electro-hydraulic push rod (41).

Description

Production method of copper-aluminum composite material Technical Field The invention relates to the technical field of copper-aluminum composite material casting, in particular to a copper-aluminum composite material production method. Background The copper-aluminum composite material has wide application prospect in the fields of power electronics, new energy automobile battery connectors, rail transit, communication equipment and the like because the copper-aluminum composite material has the advantages of high electric conductivity and thermal conductivity of copper and light weight and low cost of aluminum. The aluminum-copper-aluminum three-layer structure composite material is in a typical copper-aluminum composite product form, and aluminum layers are arranged on two sides and copper layers are arranged in the middle of the aluminum-copper-aluminum three-layer structure composite material, so that the conductivity can be ensured, and the material cost can be effectively reduced. At present, one of the common methods for preparing the aluminum-copper-aluminum three-layer composite material is a solid-liquid composite method, namely, a solid copper plate is placed in a crystallizer, then liquid aluminum is poured, so that metallurgical bonding is formed between the aluminum liquid and the copper plate in the solidification process, and the method has the advantages of short process flow, relatively low equipment investment, high interface bonding strength and the like, and is particularly suitable for producing composite ingots, and then the composite ingots and the composite strips are processed into composite plate strips with required specifications through subsequent rolling. The technical problems that 1, when a copper plate is subjected to offset in the casting process, the thickness of a composite layer is uneven are still solved, namely, the copper plate is offset to one side, after the copper plate is vertically placed in a crystallizer, the copper plate is impacted when aluminum liquid is injected, meanwhile, uneven force is applied to the copper plate due to flowing and solidification shrinkage of the aluminum liquid in the crystallizer, the copper plate is not effectively and dynamically restrained in the crystallizer, particularly in the downward movement process of the ingot, the rear section of the copper plate is in an unconstrained state, inclination or offset is very easy to occur, once the copper plate is offset, the thickness of the aluminum layers on two sides of the ingot is inconsistent, even a core offset phenomenon occurs in severe cases, namely, the copper plate is offset to one side, so that the aluminum layer on the side is too thin, the aluminum layer on the opposite side is too thick, the stability of a subsequent rolling process is affected, the conductivity and the mechanical property of a composite material are reduced, and the position and the posture of the copper plate are mainly fixed by a mechanical clamp or a clamping groove in the initial positioning process, after the casting is started, the clamp is usually required to be loosened or moved upwards so that the interference of the copper plate is difficult to be sensed, and the quality of a product cannot be adjusted in real time according to the real-time cannot be judged, and the quality of the copper plate cannot be easily adjusted. In view of the above problems, there is a need in the art to develop a method for producing a copper-aluminum composite material, which can dynamically clamp and monitor a copper plate in real time, ensure stable posture of the copper plate, and improve interface bonding quality. Disclosure of Invention The invention aims to overcome the existing defects, provides a copper-aluminum composite material production method, and aims to detect the posture of a copper plate in real time by arranging a double-layer clamping structure of a fixed clamping roller and a floating clamping roller with a detection function, and can automatically correct the inclined copper plate by utilizing the difference of hydrostatic pressure of aluminum, so that the problems of core deviation and uneven thickness of an aluminum layer caused by easy deviation of the copper plate in the traditional process are effectively solved, the dependence on manual operation experience is greatly reduced, the semi-continuous casting process is more stable and reliable, high-quality blanks are provided for the subsequent rolling process, and the problems in the background art can be effectively solved. In order to achieve the purpose, the invention provides the following technical scheme that the copper-aluminum composite material production method comprises the following steps: s1, placing a pretreated copper plate into a preheating furnace, and heating to 300-450 ℃ to reduce the temperature difference with aluminum liquid and prevent the aluminum liquid from forming a cold interlayer when meeting cold flash set; S2, ve