JP2004291090A5

JP2004291090A5 -

Info

Publication number: JP2004291090A5
Application number: JP2003406036A
Authority: JP
Filing date: 2003-12-04
Publication date: 2005-06-09
Anticipated expiration: 2023-08-22

Description

本発明に係る異種金属のレーザロール接合装置は、非接触状態で保持された材質の異なる第１金属板と第２金属板とに対し、第１金属板のみをレーザ照射によって加熱するレーザ照射手段と、そのレーザ照射手段によるレーザ光を照射して加熱した第１金属板の加熱部を圧接ローラによって第２金属板に押圧して密着させるローラ押圧手段とを有し、加熱した第１金属板を第２金属板に押圧して塑性変形を与えることによって当該両金属板を接合させるようにしたものであって、前記第１金属板と前記第２金属板との接合部の温度変化が相互拡散係数の高い温度帯を短時間に通過するように冷却するようにした冷却手段を有することを特徴とする。
また、本発明に係る異種金属のレーザロール接合装置は、前記圧接ローラによる接合した接合部の温度を検出する温度センサを有し、その温度センサから得られる温度データに基づいて前記冷却手段をフィードバック制御するようにしたものであることが望ましい。
前記冷却手段は、前記圧接ローラによって前記第１金属板と前記第２金属板とを押圧した位置で、前記第２金属板を非接合面側から冷却するように設けられたものであることが望ましい。
また、前記冷却手段は、前記圧接ローラ及び前記第１金属板を冷却するように設けられたものであることが望ましい。 The laser roll bonding apparatus for dissimilar metals according to the present invention is a laser irradiation means for heating only the first metal plate by laser irradiation with respect to the first metal plate and the second metal plate which are made of different materials and held in a non-contact state. And roller pressing means for pressing the heating portion of the first metal plate heated by irradiating the laser beam by the laser irradiation means with the press roller against the second metal plate, and heating the first metal plate The two metal plates are joined by pressing the second metal plate to apply plastic deformation, and the temperature change of the joint portion between the first metal plate and the second metal plate It is characterized by having a cooling means adapted to cool so as to pass through a temperature zone having a high diffusion coefficient in a short time .
The laser roll bonding apparatus for dissimilar metals according to the present invention further includes a temperature sensor for detecting the temperature of the bonded portion joined by the pressure roller, and the cooling means is fed back based on temperature data obtained from the temperature sensor. It is desirable that it be controlled.
The cooling means is provided so as to cool the second metal plate from the non-joining surface side at a position where the first metal plate and the second metal plate are pressed by the pressure roller. desirable.
Preferably, the cooling means is provided to cool the pressure roller and the first metal plate.

従って、前記レーザロール接合装置により、本発明に係る異種金属のレーザロール接合方法、すなわち、非接触状態で保持された材質の異なる第１金属板と第２金属板とに対し、第１金属板のみをレーザ照射によって加熱した後、その第１金属板の加熱部を圧接ローラによって第２金属板に押圧して密着させ、塑性変形を与えることによって両金属板を接合する過程で、前記第１金属板と前記第２金属板との接合部の冷却を実行する。その際、接合部を冷却するために、前記圧接ローラによって前記第１金属板と前記第２金属板とを押圧した位置で、前記第２金属板を非接合面側から冷却したり、また前記圧接ローラ及び前記第１金属板を冷却する。
よって、本発明によれば、加熱のために金属板に入った熱は効果的に内部拡散して接合部分の温度が緊急に低下することになる。そのため、脆性な化合物が生成される温度を極めて短時間に通過するので、延性のある金属間化合物の生成量を多くして継手の接合強度を向上させることができる。 Therefore, with the laser roll bonding apparatus, the laser roll bonding method of dissimilar metals according to the present invention, that is, the first metal sheet and the second metal sheet which are held in a non-contact state and which are made of different materials. After heating only by laser irradiation, the heating portion of the first metal plate is pressed against the second metal plate by a pressure roller to bring it into close contact, and the first metal plate is joined in a process of joining the two metal plates by applying plastic deformation. Cooling of the joint between the metal plate and the second metal plate is performed. At that time, the second metal plate is cooled from the non-bonding surface side at a position where the first metal plate and the second metal plate are pressed by the pressure roller to cool the bonding portion, or The pressure roller and the first metal plate are cooled.
Therefore, according to the present invention, the heat which has entered the metal plate for heating is effectively diffused internally, and the temperature of the bonding portion is reduced urgently. Therefore, since the temperature at which a brittle compound is formed is passed in a very short time, it is possible to improve the joint strength of the joint by increasing the generation amount of the ductile intermetallic compound.

また、本発明に係る異種金属のレーザロール接合装置は、接合される両金属板の高温酸化を防止するための酸化防止手段を有することが望ましく、不活性ガスを両板の接合部に吹付け、またはアルミニウムのように強固な酸化被膜をもつ材料側にフラックスを塗布するようにする。そうした酸化防止手段としては、フラックス塗布をスプレー、スクリーン印刷またはディスペンサによって行うものであることが望ましい。
更に、本発明に係る異種金属のレーザロール接合装置は、前記第１金属板を鋼板とし、前記第２金属板をアルミ板又はアルミ合金板として接合を行うものであることが望ましい。 The laser roll bonding apparatus for dissimilar metals according to the present invention preferably has an oxidation preventing means for preventing high temperature oxidation of both metal plates to be bonded, and an inert gas is sprayed to the bonding portion of both plates The flux is applied to the side of the material having a strong oxide film such as aluminum. As such an antioxidant means, it is desirable that flux application is performed by spray, screen printing or a dispenser.
Further, in the laser roll bonding apparatus of dissimilar metals according to the present invention, it is preferable that bonding is performed using the first metal plate as a steel plate and the second metal plate as an aluminum plate or an aluminum alloy plate.

従って、接合界面にできる比較的延性のあるFeAlの金属間化合物は、SPCC鋼板３がアルミ合金板４に押し付けられ、鉄中のアルミニウムが拡散する拡散係数が上昇する温度にまで一気に加熱されることにより生成される。しかし、冷却時には、アルミ合金板４が直接
加熱されていないため熱の内部拡散によって急速に冷却されるものの、アルミニウム中の鉄の拡散が起きる４５０〜６００℃を通過して温度が下がる際、その通過時間が１〜２秒程度で接合界面に脆性なアルミリッチの金属化合物が生成されてしまう。つまり、接合界面の冷却スピードが、レーザロール接合において接合強度を左右する重要な要因となるものであった。図１５に示すように脆性の金属間化合物の割合が多くなっているのも、送り速度が遅いため入熱量が多く、その分、冷却スピードも遅いためであると考えられる。 Therefore, the relatively ductile FeAl intermetallic compound that can form a bonding interface is heated to a temperature at which the SPCC steel plate 3 is pressed against the aluminum alloy plate 4 and the diffusion coefficient at which aluminum in iron diffuses increases. Generated by However, during cooling, although aluminum alloy plate 4 is not directly heated, it is rapidly cooled by internal diffusion of heat, but diffusion of iron in aluminum occurs when the temperature falls after passing through 450 to 600 ° C. When passing time is about 1 to 2 seconds, brittle aluminum-rich metal compounds are formed at the bonding interface. That is, the cooling speed of the bonding interface is an important factor that determines the bonding strength in laser roll bonding. The reason why the ratio of brittle intermetallic compounds is high as shown in FIG. 15 is considered to be also because the heat input is large because the feed rate is slow, and the cooling speed is slow accordingly.

よって、以上詳細に説明したように、本実施の形態の異種金属のレーザロール接合方法およびレーザロール接合装置によれば、金属板を積極的に冷却することにより、接合界面の温度は、効果的に熱の内部拡散が生じることによって緊急に低下することになる。そのため、脆性な化合物が生成される温度を極めて短時間に通過させることができ、延性のある金属間化合物の生成量を多くして継手の接合強度を向上させることが可能になった。
また、レーザ光Ｂをパルス照射にしたり、接合面へ直接照射することにより、金属板への入熱量を抑えて冷却効果を高めることで、やはり脆性な化合物が生成される温度を極めて短時間に通過させることができ、延性のある金属間化合物の生成量を多くして継手の接合強度を向上させることが可能になった。
Therefore, as described above in detail, according to the laser roll bonding method and laser roll bonding apparatus for dissimilar metals of the present embodiment, the temperature of the bonding interface is effectively reduced by actively cooling the metal plate. It will be reduced urgently by the internal diffusion of heat. Therefore, it is possible to pass the temperature at which a brittle compound is generated in a very short time, and it is possible to increase the amount of ductile intermetallic compound and improve the joint strength of the joint.
In addition, the heat input to the metal plate is suppressed by pulsing the laser beam B or direct irradiation to the bonding surface to enhance the cooling effect, and the temperature at which the brittle compound is generated is also extremely short. It has become possible to increase the joint strength of the joint by increasing the amount of ductile intermetallic compound that can be passed through.

Claims

For the first metal plate and the second metal plate of different materials held in a non-contact state, only the first metal plate is heated by laser irradiation, and then the heating portion of the first metal plate is heated by the pressure roller In a laser roll bonding method of dissimilar metals, the metal plates are joined by pressing them in close contact with each other and applying plastic deformation to the metal plates,
A laser roll bonding method of dissimilar metals characterized in that the bonding portion between the first metal plate and the second metal plate is cooled so that a temperature change passes through a temperature zone having a high mutual diffusion coefficient in a short time .

In the laser roll bonding method of dissimilar metals according to claim 1,
A laser roll bonding method of dissimilar metals characterized in that a temperature of a bonded portion joined by the pressure roller is detected, and feedback control of cooling capacity is performed based on the temperature data.

In the laser roll bonding method of a dissimilar metal according to claim 1 or 2,
The laser roll bonding method of dissimilar metals characterized in that the second metal plate is cooled from the non-bonding surface side at a position where the first metal plate and the second metal plate are pressed by the pressure roller. .

In the laser roll bonding method of dissimilar metals according to any one of claims 1 to 3,
A laser roll bonding method of dissimilar metals characterized in that the pressure contact roller and the first metal plate are cooled.

The first metal plate and the second metal plate of different materials held in a non-contact state are heated by irradiating the first metal plate with a pulsed laser beam from the non-bonding surface side, (1) In a laser roll bonding method of dissimilar metals, wherein the heating portion of one metal plate is pressed against and brought into close contact with a second metal plate by a pressure roller, and plastic deformation is applied to bond the two metal plates;
The laser roll bonding method of dissimilar metals is characterized in that the irradiation spot of the laser beam output in a pulse form is irradiated so as to overlap the non-bonding surface of the first metal plate in the bonding line direction.

In the laser roll bonding method of dissimilar metals according to claim 5,
The overlap of the irradiation spots is determined so that the heating spots generated on the bonding surface side of the first metal plate by the laser irradiation are continuous, and the pulse-like laser light is irradiated. Laser roll bonding method of dissimilar metals.

In the laser roll bonding method of dissimilar metals according to claim 5 or 6,
A laser roll bonding method of dissimilar metals, wherein pulse irradiation and a feed speed of the first and second metal plates are synchronized so that the heating spots are continuous.

In the laser roll bonding method of dissimilar metals according to any one of claims 1 to 7,
In order to prevent high temperature oxidation of both metal plates to be joined, an inert gas is blown to the junction of both plates, or flux is applied to the material side having a strong oxide film such as aluminum. The laser roll joining method of dissimilar metals characterized by the above.

In the laser roll bonding method of dissimilar metals according to claim 8,
The laser roll bonding method of dissimilar metals, wherein the application amount of the flux is 2 μm or less.

In the laser roll bonding method for dissimilar metals according to any one of claims 1 to 9,
A laser roll joining method of dissimilar metals comprising joining the first metal plate as a steel plate and the second metal plate as an aluminum plate or an aluminum alloy plate.

Laser irradiation means for heating only the first metal plate by laser irradiation and laser light from the laser irradiation means are applied to the first metal plate and the second metal plate of different materials held in a non-contact state Roller heating means for pressing the heated portion of the heated first metal plate against the second metal plate by a pressure roller to bring it into intimate contact with the second metal plate, and press the heated first metal plate against the second metal plate to cause plastic deformation In a laser roll bonding apparatus of dissimilar metals adapted to bond the two metal plates by
The dissimilar metal characterized in that it comprises a cooling means for cooling so that the temperature change of the joint portion between the first metal plate and the second metal plate passes the temperature zone having a high mutual diffusion coefficient in a short time. Laser roll bonding equipment.

In the laser roll bonding method of dissimilar metals according to claim 11,
A dissimilar metal comprising: a temperature sensor for detecting a temperature of a joined portion joined by the pressure roller; and feedback control of the cooling means based on temperature data obtained from the temperature sensor. Laser roll bonding method.

A laser roll bonding apparatus for dissimilar metals according to claim 11 or 12
The cooling means is provided so as to cool the second metal plate from the non-joining surface side at a position where the first metal plate and the second metal plate are pressed by the pressure roller. Laser roll bonding device for dissimilar metals.

A laser roll bonding apparatus for dissimilar metals according to any one of claims 11 to 13.
The laser roll bonding apparatus of dissimilar metals, wherein the cooling means is provided to cool the pressure contact roller and the first metal plate.

A laser irradiation unit configured to heat the first metal plate by irradiating pulsed laser light from the non-bonding surface side to the first metal plate and the second metal plate which are made of different materials and held in a non-contact state; And a roller pressing means for pressing the heating portion of the first metal plate heated by irradiating the laser beam by the laser irradiation means with the press roller against the second metal plate and bringing the heated first metal plate into contact. In a laser roll bonding apparatus of dissimilar metals, the second metal sheet is pressed to apply plastic deformation to bond the two metal sheets.
The laser irradiation unit is connected to the control unit, and the irradiation spot of the laser beam output in a pulse shape is irradiated in a bonding line direction on the non-bonding surface of the first metal plate by driving control by the control unit. What is claimed is: 1. A laser roll bonding apparatus for dissimilar metals characterized in that:

In the laser roll bonding apparatus for dissimilar metals according to claim 15,
The control means is set to control the driving of the laser irradiation means so that the heating spots generated on the bonding surface side of the first metal plate can be continued by overlapping the irradiation spots. Laser roll bonding equipment of different metals.

The laser roll bonding apparatus for dissimilar metals according to claim 15 or 16
The laser roll bonding apparatus of dissimilar metals, wherein the control means synchronizes the pulse irradiation and the feed rates of the first and second metal plates so that the heating spots are continuous.

A laser roll bonding apparatus for dissimilar metals according to any one of claims 11 to 17.
In order to prevent high temperature oxidation of both metal plates to be joined, antioxidizing means is used which sprays inert gas on the joints of both plates or applies flux to the material side with a strong oxide film such as aluminum. A laser roll bonding apparatus for dissimilar metals characterized by comprising:

The laser roll bonding apparatus for dissimilar metals according to claim 18
The laser roll bonding apparatus for dissimilar metals characterized in that the oxidation preventing means performs flux application by spray, screen printing or dispenser.

A laser roll bonding apparatus for dissimilar metals according to any one of claims 11 to 19,
A laser roll bonding apparatus of dissimilar metals, wherein the first metal plate is a steel plate and the second metal plate is an aluminum plate or an aluminum alloy plate.