Hot rolling method of aluminum alloy composite and aluminum alloy composite
By performing roll forming without roll gaps from half the length of the composite ingot towards both ends during the hot rolling process of aluminum alloy composite materials, the problem of material deviation was solved, resulting in higher production efficiency and yield.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-12-16
- Publication Date
- 2026-04-07
AI Technical Summary
Traditional hot rolling processes for aluminum alloy composite materials are prone to causing the upper and lower materials to deviate during the rolling process, resulting in low production efficiency and yield.
A new hot rolling method is adopted, which involves rolling the composite ingot from half its length toward both ends without a roll gap. By controlling the position and force of the work rolls, it is ensured that the skin and core materials do not deviate during the rolling process, and multiple rolling passes are performed.
It improved the production efficiency and yield of aluminum alloy composite materials, reduced the scrap probability, and increased production efficiency by 35%.
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Figure CN115846407B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of aluminum processing, in particular to a hot rolling method of aluminum alloy composite material and the aluminum alloy composite material. BACKGROUND
[0002] The aluminum alloy composite material is widely used in the fields of automobile, air separation equipment and heat exchanger of air conditioner, and in the hot rolling process, a plurality of skin materials are compounded with core materials to obtain hot rolling blank of the composite material.
[0003] The traditional hot rolling process of the aluminum alloy composite material is to cover the prepared skin materials to the upper surface and the lower surface of the core material, then bind and push into the heating furnace by using steel belt for heating and heat preservation; when the hot rolling and compounding are carried out, after the roll gap contacts the surface of the composite ingot and the rolling force is static to a certain rolling force, the pre-prepared rolling reduction of each compounding pass is started from one end of the composite ingot to the tail of the other end and then thrown out.
[0004] Due to the influence of factors such as temperature, thickness difference and rolling force fluctuation, the above hot rolling process of the aluminum alloy composite material is prone to cause the upper skin material and the lower skin material to deviate during rolling and cannot continue to roll, and finally can only be lifted out of scrap, so that the production efficiency and the yield are relatively low. SUMMARY
[0005] The purpose of the embodiment of the present application is to provide a hot rolling method of aluminum alloy composite material, so as to solve the problem that the existing hot rolling process of the aluminum alloy composite material is prone to cause the upper skin material and the lower skin material to deviate during rolling and cannot continue to roll, and finally can only be lifted out of scrap, so that the production efficiency and the yield are relatively low.
[0006] In order to solve the above technical problem, in a first aspect, the embodiment of the present application provides a hot rolling method of aluminum alloy composite material, which comprises the following steps:
[0007] Step S1, covering the upper skin material and the lower skin material to the upper surface and the lower surface of the core material respectively, and binding the core material, the upper skin material and the lower skin material together by using steel belt to obtain a composite ingot, and then putting the composite ingot into a heating furnace for heating and heat preservation;
[0008] Step S2, conveying the composite ingot after heat preservation into the roll gap formed by the upper work roll and the lower work roll of the rolling mill, and stopping the conveying of the composite ingot when the center position of the roll gap is aligned with the one-half length position of the composite ingot;
[0009] Step S3, firstly control the lower work roll to retract 5mm to increase the roll gap, then control the upper work roll to press down to the direction of the composite ingot to reduce the roll gap, until the upper work roll contacts the upper surface of the composite ingot and the rolling force reaches 50-100 tons, stop adjusting the roll gap;
[0010] Step S4, control the lower work roll to press up 1-1.5mm to the direction of the composite ingot, then control the upper work roll and the lower work roll to perform the first rolling on the composite ingot; wherein the composite ingot is firstly rolled from the half length position to the tail end of the composite ingot in the outlet direction of the rolling mill, then rolled from the tail end of the composite ingot to the head end of the composite ingot in the inlet direction of the rolling mill, then rolled from the head end of the composite ingot to the half length position in the outlet direction of the rolling mill, and the roll gap stays at the half length position of the composite ingot; in the first rolling process, the composite ingot is always located in the roll gap;
[0011] Step S5, control the lower work roll to press up 1.5-2mm to the direction of the composite ingot, then control the upper work roll and the lower work roll to perform the second rolling on the composite ingot; wherein the composite ingot is firstly rolled from the half length position to the tail end of the composite ingot in the outlet direction of the rolling mill, then rolled from the tail end of the composite ingot to the head end of the composite ingot in the inlet direction of the rolling mill; in the second rolling process, the composite ingot is always located in the roll gap;
[0012] Step S6, control the lower work roll to press up 3-3.5mm to the direction of the composite ingot, then control the upper work roll and the lower work roll to perform the third rolling on the composite ingot; wherein the composite ingot is rolled from the head end to the tail end of the composite ingot in the outlet direction of the rolling mill, until the composite ingot leaves the roll gap, thereby completing the hot rolling of the aluminum alloy composite material;
[0013] S7, the aluminum alloy composite material after completing the hot rolling is subjected to secondary rolling according to the secondary given pass reduction.
[0014] Preferably, before the step S1, it further comprises: milling the upper surface and the lower surface of the core material, and polishing the upper skin material and the lower skin material attached to the core material.
[0015] Preferably, in the step S2, after stopping the delivery of the composite ingot, it further comprises the step of: closing the emulsion spraying of the rolling mill.
[0016] Preferably, in the step S4, when the upper work roll and the lower work roll are controlled to roll the composite ingot for the first time, the rolling speed of the upper work roll and the lower work roll is kept at 0.2-0.3 m / s.
[0017] Preferably, in the step S5, when the upper work roll and the lower work roll are controlled to roll the composite ingot for the second time, the rolling speed of the upper work roll and the lower work roll is kept at 0.2-0.3 m / s.
[0018] Preferably, in the step S6, when the upper work roll and the lower work roll are controlled to roll the composite ingot for the third time, the rolling speed of the upper work roll and the lower work roll is kept at 1.5-1.5 m / s.
[0019] Preferably, before the step S7, the emulsion spraying of the rolling mill is started.
[0020] Preferably, the retraction and pressing of the lower work roll are controlled by a hydraulic pressing cylinder, and the pressing of the upper work roll is controlled by a screw rod.
[0021] Preferably, in the step S7, the given pass reduction of the second stage is 20-40 mm.
[0022] In a second aspect, the embodiment of the present application provides an aluminum alloy composite material, which is made by the hot rolling method of the aluminum alloy composite material.
[0023] Compared with the prior art, the hot rolling method of the aluminum alloy composite material in the present application solves the problem that the traditional hot rolling process of the aluminum alloy composite material cannot continue rolling due to the influence of factors such as temperature, thickness difference and rolling force fluctuation, which causes the upper skin material and the lower skin material to deviate during rolling, and improves the production efficiency and yield of the aluminum alloy composite material. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0025] Figure 1 The figure shows the step flow of the hot rolling method of the aluminum alloy composite material provided by the embodiment of the present application. DETAILED DESCRIPTION
[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.
[0027] The embodiments of the present application provide a hot rolling method of an aluminum alloy composite material, which comprises the following steps: Figure 1 The embodiments of the present application provide a hot rolling method of an aluminum alloy composite material, which comprises the following steps:
[0028] Step S1, the upper skin material and the lower skin material are respectively covered on the upper surface and the lower surface of the core material, and the core material, the upper skin material and the lower skin material are bundled together by a steel belt to obtain a composite ingot, and then the composite ingot is placed in a heating furnace for heating and heat preservation.
[0029] The skin material covered on the upper surface of the core material is the upper skin material, and the skin material covered on the lower surface of the core material is the lower skin material,
[0030] Before the skin materials respectively covered on the upper surface and the lower surface of the core material are bundled together by the steel belt, the step of milling the upper surface and the lower surface of the core material and polishing the upper skin material and the lower skin material attached to the core material is further included. In this way, the upper skin material and the lower skin material can be better covered on the upper surface and the lower surface of the core material.
[0031] Step S2, the composite ingot after heat preservation is transported into a roll gap formed by the upper work roll and the lower work roll of a rolling mill, and when the center position of the roll gap is aligned with the half-length position of the composite ingot, the transportation of the composite ingot is stopped.
[0032] After the transportation of the composite ingot is stopped, the step of closing the emulsion spray of the rolling mill is further included. In this way, when the composite ingot is rolled, the emulsion can be prevented from entering between the upper skin material and the core material, and the emulsion can also be prevented from entering between the lower skin material and the core material, so as to affect the hot rolling of the composite ingot.
[0033] Step S3, the lower work roll is first controlled to retract 5mm to increase the roll gap, and then the upper work roll is controlled to press down in the direction of the composite ingot to reduce the roll gap, until the upper work roll contacts the upper surface of the composite ingot, and the rolling force of the upper work roll and the lower work roll reaches 50-100 tons, and then the adjustment of the roll gap is stopped.
[0034] Step S4, the lower work roll is controlled to press up 1-1.5mm in the direction of the composite ingot, and then the upper work roll and the lower work roll are controlled to perform the first rolling on the composite ingot.
[0035] The composite ingot is first rolled from its half-length position towards the exit direction of the rolling mill to the tail end of the composite ingot, then rolled from the tail end of the composite ingot towards the entrance direction of the rolling mill to the head end of the composite ingot, and then rolled from the head end of the composite ingot towards the exit direction of the rolling mill to the half-length position of the composite ingot, and the roll gap is stopped at the half-length position of the composite ingot.
[0036] In the first rolling process, the composite ingot is always located in the roll gap; that is, in the first rolling process, when the composite ingot is rolled to the first end, its first end is kept in the roll gap, and when the composite ingot is rolled to the last end, its last end is kept in the roll gap.
[0037] When controlling the upper and lower work rolls to perform the first rolling of the composite ingot, the rolling speed of the upper and lower work rolls is maintained at 0.2-0.3 m / s.
[0038] Step S5: Control the lower work roll to press the composite ingot 1.5-2mm in the direction of the composite ingot, and then control the upper work roll and the lower work roll to perform a second rolling on the composite ingot.
[0039] The composite ingot is first rolled from half its length toward the exit of the rolling mill to the tail end of the composite ingot, and then rolled from the tail end toward the entrance of the rolling mill to the head end of the composite ingot.
[0040] In the second rolling process, the composite ingot is always located in the roll gap; that is, in the first rolling process, when the composite ingot is rolled to the first end, its first end is kept in the roll gap, and when the composite ingot is rolled to the last end, its last end is kept in the roll gap.
[0041] When controlling the upper and lower work rolls to perform the second rolling of the composite ingot, the rolling speed of the upper and lower work rolls is maintained at 0.2-0.3 m / s.
[0042] Step S6: Control the lower work roll to press the composite ingot 3-3.5mm upwards, and then control the upper and lower work rolls to perform a third rolling process on the composite ingot.
[0043] The composite ingot is rolled from its head end toward the exit direction of the rolling mill to its tail end until the composite ingot leaves the roll gap, thereby completing the hot rolling composite of aluminum alloy composite material.
[0044] When controlling the upper and lower work rolls to perform the third rolling of the composite ingot, the rolling speed of the upper and lower work rolls is maintained at 1.5-1.5 m / s.
[0045] Step S7: The aluminum alloy composite material that has completed hot rolling is subjected to secondary rolling according to the given reduction amount in the second stage.
[0046] That is, after the hot rolling of the aluminum alloy composite material is completed, the composite ingot can be rolled normally according to the secondary given reduction per pass; the secondary given reduction per pass is 20-40mm.
[0047] During the secondary rolling process, the emulsion spraying of the rolling mill is activated first. This provides lubrication for the aluminum alloy composite material, facilitating normal rolling.
[0048] In this embodiment, the upper work roll is controlled by a lead screw (lead screw mechanism) to press down and retract in subsequent steps, while the lower work roll is controlled by a hydraulic pressing cylinder (hydraulic mechanism) to retract and press up. That is, controlling the upper work roll is equivalent to controlling the lead screw to control the upper work roll, and controlling the lower work roll is equivalent to controlling the pressing cylinder of the hydraulic mechanism to control the lower work roll. Because the lead screw mechanism is controlled by a motor, the rolling force of the upper work roll it controls is limited. Therefore, to increase the rolling force, it can only be achieved by using the lower work roll controlled by the hydraulic mechanism. Of course, if equipment cost is not considered, the upper work roll can also be controlled by a hydraulic pressing cylinder to press down and retract in subsequent steps.
[0049] Compared with existing technologies, the hot rolling method for aluminum alloy composite materials in this embodiment solves the problem of misalignment of the upper and lower sheet materials during rolling, which is caused by fluctuations in temperature, thickness difference, and rolling force, leading to the inability to continue rolling in the traditional hot rolling process. This improves the production efficiency and yield of aluminum alloy composite materials. Furthermore, since the upper and lower sheet materials do not misalign during rolling, the probability of scrapping the aluminum alloy composite material is reduced, avoiding additional waste.
[0050] After a year of rigorous on-site production, using the hot rolling method of aluminum alloy composite materials in this embodiment to produce more than 1200 coils of composite materials, no problem of upper and / or lower skin material deviation occurred. Compared with the traditional process, the production efficiency has been improved by 35%.
[0051] The present invention also provides an embodiment of an aluminum alloy composite material, which is made by the hot rolling method of the aluminum alloy composite material in the above embodiment.
[0052] Since the aluminum alloy composite material in this embodiment is made by the hot rolling method of the aluminum alloy composite material in the above embodiment, it can also achieve the technical problems achieved by the hot rolling method of the aluminum alloy composite material in the above embodiment.
[0053] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.
Claims
1. A hot rolling method for aluminum alloy composite materials, characterized in that, The hot rolling method for the aluminum alloy composite material includes the following steps: Step S1: Cover the upper and lower skin materials onto the upper and lower surfaces of the core material respectively, and bind the core material, the upper skin material and the lower skin material together with steel strips to obtain a composite ingot. Then, place the composite ingot into a heating furnace for heating and heat preservation. Step S2: After the heat preservation is completed, the composite ingot is fed into the roll gap formed by the upper and lower work rolls of the rolling mill, and the feeding of the composite ingot is stopped when the center of the roll gap is aligned with half the length of the composite ingot. Step S3: First, control the lower working roll to retract 5mm to increase the roll gap, then control the upper working roll to press down towards the composite ingot to reduce the roll gap until the upper working roll contacts the upper surface of the composite ingot and the rolling force between it and the lower working roll reaches 50-100 tons, then stop adjusting the roll gap. Step S4: Control the lower work roll to press the composite ingot 1-1.5mm towards it, then control the upper and lower work rolls to perform the first rolling pass on the composite ingot; wherein, the composite ingot is first rolled from its half-length position towards the exit direction of the rolling mill to the tail end of the composite ingot, then from the tail end of the composite ingot towards the entrance direction of the rolling mill to the head end of the composite ingot, and then from the head end of the composite ingot towards the exit direction of the rolling mill to the half-length position of the composite ingot, and the roll gap is stopped at the half-length position of the composite ingot; in the first rolling process, the composite ingot is always located in the roll gap; Step S5: Control the lower work roll to press the composite ingot 1.5-2mm towards it, and then control the upper and lower work rolls to perform a second rolling process on the composite ingot; wherein, the composite ingot is first rolled from its half-length position towards the exit of the rolling mill to the tail end of the composite ingot, and then rolled from the tail end of the composite ingot towards the entrance of the rolling mill to the head end of the composite ingot; in the second rolling process, the composite ingot is always located in the roll gap; Step S6: Control the lower work roll to press the composite ingot 3-3.5mm towards it, and then control the upper and lower work rolls to perform a third rolling process on the composite ingot; wherein, the composite ingot is rolled from its head end toward the exit of the mill to the tail end of the composite ingot until the composite ingot leaves the roll gap, thereby completing the hot rolling composite of aluminum alloy composite material. S7. The aluminum alloy composite material that has been hot-rolled is subjected to secondary rolling according to the given reduction amount in the second stage.
2. The hot rolling method for aluminum alloy composite materials as described in claim 1, characterized in that, Before step S1, the method further includes: milling the upper and lower surfaces of the core material, and polishing the upper and lower skin materials attached to the core material.
3. The hot rolling method for aluminum alloy composite materials as described in claim 1, characterized in that, In step S2, after stopping the conveying of the composite ingot, the step further includes: shutting off the emulsion spraying of the rolling mill.
4. The hot rolling method for aluminum alloy composite materials as described in claim 1, characterized in that, In step S4, when the upper work roll and the lower work roll are controlling the first rolling of the composite ingot, the rolling speed of the upper work roll and the lower work roll is maintained at 0.2-0.3 m / s.
5. The hot rolling method for aluminum alloy composite materials as described in claim 4, characterized in that, In step S5, when the upper work roll and the lower work roll are controlling the composite ingot to perform the second rolling, the rolling speed of the upper work roll and the lower work roll is maintained at 0.2-0.3 m / s.
6. The hot rolling method for aluminum alloy composite materials as described in claim 5, characterized in that, In step S6, when the upper work roll and the lower work roll are controlling the composite ingot to perform the third rolling, the rolling speed of the upper work roll and the lower work roll is maintained at 1.5-1.5m / s.
7. The hot rolling method for aluminum alloy composite materials as described in claim 3, characterized in that, Before step S7 is performed, the emulsion spraying of the rolling mill is turned on.
8. The hot rolling method for aluminum alloy composite materials as described in claim 1, characterized in that, The lower working roller is controlled to retract and press up by a hydraulic pressing cylinder, and the upper working roller is controlled to press down by a lead screw.
9. The hot rolling method for aluminum alloy composite materials as described in claim 1, characterized in that, In step S7, the given reduction amount for the secondary pass is 20-40 mm.
10. An aluminum alloy composite material, characterized in that, The aluminum alloy composite material is made by the hot rolling method of the aluminum alloy composite material according to any one of claims 1 to 9.
Citation Information
Patent Citations
Preparation method of aluminum alloy plate strip for anodic oxidation appearance and aluminum alloy plate strip
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