CN110064658B

CN110064658B - Method for preparing titanium-magnesium composite board through self-riveting prefabricated hole configuration rolling riveting

Info

Publication number: CN110064658B
Application number: CN201910471120.2A
Authority: CN
Inventors: 宗影影; 唐伟; 邵斌; 徐振海; 单德彬; 郭斌
Original assignee: Harbin Institute of Technology Shenzhen
Current assignee: Harbin Institute of Technology Shenzhen
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2021-02-09
Anticipated expiration: 2039-05-31
Also published as: CN110064658A

Abstract

A method for preparing a titanium-magnesium composite plate by self-riveting prefabricated hole configuration rolling and riveting. The invention relates to a method for preparing a layered heterogeneous metal composite plate by rolling and riveting with a self-riveting prefabricated hole configuration. The invention aims to solve the problems of single prefabricated hole pattern, poor metal flow, low filling rate and large stress concentration in the rolling riveting composite method used for large-area connection of layered dissimilar metal plates. Method: By processing prefabricated holes with optimized configuration on the metal plate, including the optimization of fillets at the sharp corners of simple holes, the design of diversion structures, and the design of special-shaped holes, and then through single-pass synchronous hot rolling with large reductions The method enables the metallurgical bonding of dissimilar metals during hot rolling, and the metal fully fills the prefabricated holes to form high-quality mechanical riveting, thereby realizing high-performance double connection of mechanical riveting and metallurgical bonding. Thereby, the uniform and high-strength connection of the large-area layered heterogeneous metal composite plate is realized, and the service performance of the composite plate is improved.

Description

Method for preparing titanium-magnesium composite board through self-riveting prefabricated hole configuration rolling riveting

Technical Field

The invention relates to a method for preparing a layered heterogeneous metal composite plate by self-riveting prefabricated hole configuration rolling riveting.

Background

With the rapid development of the industries such as aerospace, ocean, war industry, traffic and the like, the requirements on the performance of metal structure materials are increasingly improved. In a complex and harsh service environment, a single metal is difficult to meet the comprehensive performance requirements of high strength, high rigidity, light weight, corrosion resistance, high temperature resistance and the like. Therefore, the layered heterogeneous metal composite sheet has become an important approach to solve the problem. The rolling riveting preparation process of the layered heterogeneous metal composite plate realizes the double combination of machinery and metallurgy through the prefabricated holes on the metal substrate so as to achieve the large-area high-performance connection of the substrate and the clad plate. However, the prefabricated hole of the existing method is single in hole type, so that metal flow is not smooth in the rolling process, the filling rate is low, stress concentration is large, and finally the problems of poor fatigue resistance of a connection interface of the heterogeneous metal composite plate, low hole type filling rate, small bonding area, low bonding strength and the like are caused.

Disclosure of Invention

The invention provides a method for preparing a laminated heterogeneous metal composite plate by rolling riveting in a self-riveting prefabricated hole configuration, which aims to solve the problems of single prefabricated hole pattern, unsmooth metal flow, low filling rate and large stress concentration in a rolling riveting composite method adopted by large-area connection of the existing laminated heterogeneous metal plate.

The invention relates to a method for preparing a layered heterogeneous metal composite plate by adopting self-riveting prefabricated hole configuration rolling riveting, which comprises the following steps:

firstly, processing a plate material: uniformly processing a plurality of prefabricated holes with specific shapes on a substrate;

secondly, plate surface treatment: the contact surface of the base plate and the cladding plate is polished mechanically or manually and then cleaned by an ultrasonic cleaner to remove an oxide layer and oil stains on the contact surface;

thirdly, compounding the plates: performing single-pass synchronous large-reduction rolling forming to obtain a hot rolled plate;

fourthly, annealing treatment: and annealing the hot rolled plate to eliminate residual stress and obtain the heterogeneous layered metal composite plate.

The invention has the beneficial effects that:

according to the invention, the self-riveting prefabricated hole configuration in the process of preparing the layered heterogeneous metal composite plate by rolling and riveting is optimally designed so as to improve the metal filling property and reduce the stress concentration. The traditional self-riveting hole type mainly takes a round shape and a rectangular shape and a small number of special-shaped hole types. The single hole pattern has poor functional characteristics, and can not simultaneously give consideration to good metal filling property and small stress concentration. Therefore, optimization of the self-clinching configuration is mainly focused on three aspects:

1. and the round angle at the sharp corner of the simple hole type is optimized. Use the rectangular hole as the example, traditional rectangular hole edge is the right angle or minimum acute angle, easily becomes to fill the dead angle and stress concentration at the metal filling in-process to the cutting metal causes the composite board performance low, consequently adopts the design of circular angle to effectively reduce the metal flow resistance, improves the metal filling effect, reduces stress concentration.

2. And designing a flow guide structure. In the traditional simple hole pattern, when the prefabricated holes of the base plate are filled with the metal of the clad plate, the metal of the clad plate is influenced by rolling pressure and shearing stress, one side of the prefabricated holes is small in positive pressure and cannot be well filled, and the other side of the prefabricated holes cuts the plate due to large shearing stress, so that the clad plate is sheared, and the quality of the plate is seriously influenced. Therefore, the design of the flow guide mechanism is introduced, the shearing angle is reduced, the metal of the shroud plate enters the prefabricated hole at a larger inflow angle, the shearing force is reduced, and the filling property of the metal hole pattern is improved.

3. And (5) optimally designing the special-shaped hole. Traditional dysmorphism hole pass is complicated, is unfavorable for downthehole metal flow on the one hand, and on the other hand rolling in-process pass takes place to warp, leads to partial region to appear the phenomenon of seam, and the apron metal can't flow in, forms the hole type cavity, seriously influences plate quality. The optimized design of the special-shaped hole increases the volume of a cavity in the hole on one hand and reduces the complexity of the hole type on the other hand. Taking the H-shaped hole as an example, metal flows in from the side groove, and meanwhile, mutual material supplement is carried out through the transverse groove, so that the metal filling rate of the hole-shaped inner cavity is improved.

Drawings

FIG. 1 is a schematic view showing the configuration of a circular hole machined in the first embodiment;

FIG. 2 is an enlarged view of a circular hole machined in the first embodiment;

FIG. 3 is a schematic view showing the configuration of the oval hole formed in the second embodiment;

FIG. 4 is an enlarged view of the oval hole machined in the second embodiment;

FIG. 5 is a schematic view showing the configuration of a rounded rectangular hole machined in the third embodiment;

FIG. 6 is an enlarged view of a rounded rectangular hole machined in the third embodiment;

FIG. 7 is a schematic view of the configuration of a racetrack shaped hole machined in the fourth embodiment;

FIG. 8 is an enlarged view of the racetrack shaped hole machined in the fourth embodiment;

FIG. 9 is a schematic view of the configuration of the V-shaped hole machined in the fifth embodiment;

FIG. 10 is an enlarged view of the V-shaped hole machined in example V;

FIG. 11 is a schematic configuration of the H-shaped hole machined in the sixth embodiment;

FIG. 12 is an enlarged view of the H-shaped hole machined in the sixth embodiment;

FIG. 13 is a photograph of a V-shaped hole roll-riveted composite board processed in example seven;

fig. 14 is a photograph of the H-shaped hole roll-riveted composite plate processed in example eight.

Detailed Description

The first embodiment is as follows: the method for preparing the layered heterogeneous metal composite plate by adopting self-riveting prefabricated hole configuration rolling riveting comprises the following steps:

This embodiment has carried out optimal design to the pass of original simple circular prefabricated hole, has introduced the guiding gutter of multiple size and shape to and special-shaped prefabricated hole, improve the flow of shroud plate metal in the prefabricated hole, improve the filling rate of shroud plate metal in the prefabricated hole, increase mechanical connection intensity, reduce local area's stress concentration. The prefabricated holes of the invention have the shapes of circle, ellipse, round rectangle, runway, V-shaped and H-shaped. In order to reduce the shearing force of the metal of the shroud plate at the edges of a circular hole, an elliptical hole and a round-corner rectangular hole and improve the filling property of the metal of the shroud plate in the hole, a metal flow guide structure is processed at the edge of a prefabricated hole, and the flow guide structure is groove-shaped and is in a flow guide hole shape. And for a complex hole type, the diversion trench is not machined in consideration of the stress concentration problem and the machinability caused by the complexity of the shape.

The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: step one, the prefabricated holes with the specific shapes are circular holes, elliptical holes, round-angle rectangular holes, runway-shaped holes, V-shaped holes or H-shaped holes. Other steps and parameters are the same as those in the first embodiment.

The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: when the thickness of the substrate is 2-5 mm, processing the prefabricated hole into a through hole; when the thickness of the substrate is 5-50 mm, the substrate is processed into a blind hole. Other steps and parameters are the same as those in the first or second embodiment.

The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: when the prefabricated holes with specific shapes are circular holes, elliptical holes, round rectangular holes or runway-shaped holes, the diversion trenches are machined inwards at the end openings of the prefabricated holes. Other steps and parameters are the same as those in one of the first to third embodiments.

The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the inclination angle of the diversion trench is 30-60 degrees. Other steps and parameters are the same as those in one of the first to fourth embodiments.

The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: the machining depth of the diversion trench is more than half of the hole depth. Other steps and parameters are the same as those in one of the first to fifth embodiments.

The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the heterogeneous layered metal composite plate obtained in the fourth step is an Al alloy/Mg alloy composite plate, a Ti alloy/Al alloy composite plate, a Ti alloy/Mg alloy composite plate, an Al alloy/Al alloy composite plate or a Mg alloy/Mg alloy composite plate. Other steps and parameters are the same as those in one of the first to sixth embodiments.

The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: the thickness of the heterogeneous layered metal composite board obtained in the fourth step is 2-100 mm, wherein the thickness ratio of the covering board to the substrate is 1 (1-5). Other steps and parameters are the same as those in one of the first to seventh embodiments.

The following examples are used to demonstrate the beneficial effects of the present invention:

the first embodiment is as follows:

selecting aluminum alloy (6061) and magnesium alloy (AZ 31B) plates with the thicknesses of 3mm and 3mm respectively, wherein the size specification is 100mm multiplied by 50 mm.

And machining a circular prefabricated through hole with the diameter of 4mm on the aluminum alloy plate by utilizing a machining mode. A diversion hole with the diameter of 5mm is processed on the basis of the round prefabricated hole, and the depth is 1 mm.

And (3) carrying out annealing pretreatment on the aluminum alloy plate and the magnesium alloy plate (annealing the two plates in a heating furnace at 300 ℃ for 30 min), and air-cooling the two plates to room temperature.

And removing an oxide layer on the contact surface of the two plates by adopting a mechanical polishing mode, cleaning the two plates for 20min by using an ultrasonic cleaner to remove oil stains on the surface, and drying the two plates by using a blower.

And (3) placing an aluminum alloy plate at the bottom, superposing the magnesium alloy plate on the upper part, fixing, wherein the thickness of the composite plate blank is about 6mm, and pushing the blank into a roller to perform single-pass large-reduction synchronous rolling.

The rolling reduction was 50% and the rolling rate was 1 m/s.

And after rolling, placing the composite board in an annealing furnace at 300 ℃ for heating for 10min, and taking out the composite board for air cooling to room temperature. Finally obtaining the aluminum magnesium composite plate product with the thickness of about 3 mm.

Example two:

And machining an oval through hole with a long axis of 4mm and a short axis of 3mm on the aluminum alloy plate by utilizing a machining mode. The long axis of the elliptical hole is perpendicular to the rolling direction. The holes are evenly distributed over the plate. And a long strip-shaped slope guide groove which is parallel to the rolling direction, is 3mm long, 2mm wide and 45-degree oblique angle is machined at the edge of the hole. Other steps and parameters are the same as those in the first embodiment.

Example three:

The mold or the hard alloy plate is utilized to process rectangular blind holes with the length of 4mm and the width of 4mm uniformly distributed on the surface of the magnesium alloy plate, and round corners with the R =0.5mm are processed at four right angles. The long side of the rectangle is parallel to the rolling direction. Other steps and parameters are the same as those in the first embodiment.

Example four:

A runway-shaped through hole consisting of two semicircular arcs with the radius of 3mm and two straight lines with the length of 3mm is processed on the aluminum alloy plate by utilizing a laser processing mode. The straight edge of the runway-shaped hole is vertical to the rolling direction. Other steps and parameters are the same as those in the first embodiment.

Example five:

Heating the aluminum alloy to 300 ℃, and processing uniformly distributed V-shaped blind holes on the surface of the magnesium alloy by utilizing a die or a hard alloy plate. The hole depth is 3 mm. The width of the V-shaped hole is 2mm, the V-shaped angle is 120 degrees, and the side length of the V-shaped hole is 10 mm. The axis of the V-shaped hole is parallel to the rolling direction. Other steps and parameters are the same as those in the first embodiment.

Example six:

And machining the H-shaped through hole by using a machining mode. The H-shaped hole consists of two rectangular grooves which are parallel to the rolling direction, are 10mm long and 2mm wide and one rectangular groove which is perpendicular to the rolling direction, is 3mm long and 2mm wide. And machining to form round corners with R =0.5mm at all the right angles. Other steps and parameters are the same as those in the first embodiment.

Example seven:

the design implementation of the self-riveting prefabricated hole configuration for preparing the layered heterogeneous metal composite plate by rolling and riveting is as follows:

in the first step of preparing the layered heterogeneous metal composite plate by rolling riveting, the V-shaped holes are adopted to obtain the rolling riveting composite plate shown in figure 13, the prefabricated hole pattern is well filled, and the mechanical riveting strength of the composite plate is high.

Example eight:

the design implementation of the self-riveting prefabricated hole configuration for preparing the layered heterogeneous metal composite plate by rolling and riveting is as follows: in the first step of preparing the layered heterogeneous metal composite plate by rolling riveting, H-shaped holes are adopted to obtain the rolling riveting composite plate shown in figure 14, the prefabricated hole pattern is well filled, and the mechanical riveting strength of the composite plate is high.

Claims

1. a method that adopts self-riveting prefabricated hole configuration rolling and riveting to prepare titanium-magnesium composite plate, it is characterized in that adopting self-riveting prefabricated hole configuration rolling and riveting to prepare titanium-magnesium composite plate method is carried out according to the following steps:

1. Pre-processing of the plate: several prefabricated holes are uniformly processed on the substrate; the prefabricated holes are oval holes, rounded rectangular holes or racetrack holes, and the diversion grooves are machined inwardly at the ports of the prefabricated holes; The thickness of the substrate is 50mm; the prefabricated hole is processed as a blind hole; the inclination angle of the guide groove is 30-60°;

2. Plate surface treatment: After mechanically or manually grinding the contact surface of the substrate and the cladding plate, use an ultrasonic cleaner to clean it to remove the oxide layer and oil stains on the contact surface;

3. Sheet compounding: hot-rolled sheet is obtained by single-pass synchronous high-reduction rolling to form;

Fourth, annealing treatment: the hot-rolled sheet is annealed to eliminate residual stress to obtain a heterogeneous layered metal composite plate; the heterogeneous layered metal composite plate is a Ti alloy/Mg alloy composite plate.

2 . The method for preparing a titanium-magnesium composite plate by rolling and riveting with self-riveting prefabricated hole configuration according to claim 1 , wherein the processing depth of the diversion groove is more than half of the hole depth. 3 .

3. a kind of method that adopts self-riveting prefabricated hole configuration rolling riveting to prepare titanium-magnesium clad plate according to claim 1, it is characterized in that the thickness of the heterogeneous layered metal clad plate obtained in step 4 is 2～100mm, The thickness ratio of the cladding plate to the substrate is 1:(1~5).