JPH01186291A - Method and device for manufacturing composite metal material - Google Patents

Abstract

PURPOSE:To eliminate the need for placing a whole device in a non-oxidizing atm. and to press-fit without being constrained by the thickness of a joining material by passing continuously the current having the voltage polarity selected so that a short circuit current is passed between materials under press-fitting roll, especially via a contact position. CONSTITUTION:A current I is passed in concentration via the respective abutting side surface layer part of materials A, B at a contact position T, the local contact of a projection part is generated at the alloy initial time on the respective surface of both members A, B having a micro-ruggedness, the contact resistance becomes large with the current I being passed concentrically to the position T and a local discharging phenomenon is also caused some times. Consequently, the pressure fitting by the rolling reduction force of a press-fitting roll 1 can be effectively performed by making the joining surface layer only at the necessary high temp. instantaneously, even if the heating temp. of the respective material in all is restricted to a comparatively low temp. such as to disregard oxidation.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for forming a composite metal material by compressing a plurality of continuous-feedable full-pressure materials such as strips, wires, and rods having different components, and Regarding equipment.

(Prior Art) As a conventional method for manufacturing this type of composite metal material, for example, the apparatus disclosed in Japanese Patent Application Laid-open No. 177973/1983 is
Shown in Figure (a). The device is a material feeding device 11.12
Materials A and B fed from each are sent between a pair of rolls consisting of a presser roll 13 and a power supply roll 14 in a non-oxidizing atmosphere chamber CH, and then a pair of rolls consisting of a pressure roll 15 and a power supply/pressure roll 16. The above-mentioned power supply roll 1 is connected to the heating mold -a17 so as to pass between the
4. Materials A and B located between the power supply and pressure bonding rolls 16
Electric heating is applied to raise the temperature to a temperature close to the melting point, and both are fused and rolled by a pressure roll 15 and a power supply/press roll 16 to form a composite metal material CM, which is then cooled by a cooling device 18 directly connected to the outside of the atmosphere chamber CH. After that, it is wound up on a winding device 19.

Further, an apparatus disclosed in Japanese Patent Application Laid-Open No. 59-218287 is shown in FIG. 5(b). The device is material feeding device 2
Material A fed from 1 is passed through a pair of power feeding rolls 23, and material B fed from a material feeding device 22 is coated with flux F on its surface and then passed through a pair of power feeding rolls 24. Pair of power supply/crimping rolls 25a/2
5b, the material A is fed by the power supply current from the heating power supply 26a connected to the power supply roll 23 and the power supply/crimping roll 25a, and the material B is fed by the heating power supply 26b connected to the power supply roll 24 and the power supply/crimping roll 25b. The materials A and B, which are being electrically heated, are passed through a pipe 27 into which an inert or reducing gas is introduced. The structure is such that the two are overlapped and rolled between the power feeding and pressure bonding rolls 25a and 25b to be plastically deformed and bonded by pressure.

As a conventional method, there is also an apparatus disclosed in Japanese Patent Laid-Open No. 147979/1983. The same device shown in Fig. 5(c) is used for base material A.
and a pair of pressure bonding rolls 35 with composite material B stacked on top of each other.
36, the contacts 371 and 372 are brought into contact with both side surfaces of the base material A, and the non-conductive material 38 that forms the surface layer of the pressure roll 35 that contacts the composite material B is placed along the circumferential surface. One end 391 of the inductor 39 protruding from the end surface of the pressure roll 35 is brought into contact with the contact 371 in the same direction, and the other end 392 is connected to the contact 372 via the contact 373 to receive high frequency signals. Connect to power supply ports Ra and Rb. Thereby, the base material A is electrically heated by a high-frequency current, and is also induction heated by the inductor 39, so that the contact surface of the composite material B of the base material A is locally molten or semi-molten and crimped.

(Problems with conventional equipment) In the conventional method shown in Figure 5(a), as shown in the detailed explanation, the heating temperature is set to a temperature slightly lower than the melting point of one of the materials, so energy consumption is reduced. It's large.

Additionally, if there is a fairly large difference in melting point between two materials to be joined, the heating temperature is set to a temperature close to the melting point of the one material with the lower melting point, so the Young's modulus of the one material is lower than the other. It is extremely small compared to that of the material, and a small reduction blade by the pressure rolls 15, 16 will cause a large deformation.

Therefore, if the mass flows on the inlet and outlet sides of the crimping roll are constant, one material must be inserted into the crimping roll at a slower speed than the other material. As a result, slipping always occurs between the two in the energized section, and the presser roll 13. It is not possible to increase the pressing force by the power supply roll 14, which causes spark generation, and there is a risk that product quality may be degraded due to spark defects.

Furthermore, since the heating temperature is close to the melting point, it is essential to place the entire device in a non-oxidizing atmosphere chamber CH, and cooling with a cooling device is essential before sending the product outdoors to the atmosphere. be done.

Furthermore, since this joining method is established on the premise that large plastic deformation is involved, it also has the disadvantage that it is impossible to join the materials in a form close to the material dimensions before joining.

In the conventional method shown in Figure 5(b), each of materials A and B is heated to a temperature below the melting point over the entire cross section.
Like the conventional method described above, the energy consumption is large, and the heating temperature requires non-oxidizing atmosphere equipment.

Furthermore, since materials A and B are each rolled under heated conditions to be plastically deformed and then crimped and joined, materials A,
It is impossible to press-bond each of B with its original dimensions.

In the conventional method shown in Fig. 5(c), heating is performed by two means: direct energization using high-frequency current and induction heating, so if composite material B is not sufficiently thinner than base material A, both No synergistic heating effect can be expected. In other words, this method has a restriction that requires the thickness of the composite material B to be sufficiently thin.

Also, it is true that only the surface layer of base material A on the side of composite material B rises in temperature, but the entire cross section of thin composite material B is heated to a high temperature, so
There is a risk that the oxidation of composite material B will progress, and countermeasure equipment will be required.

(Objective of the Invention) The present invention solves the above-mentioned problems that exist in the conventional method of press-bonding a plurality of continuous-feedable metal materials, such as strips, wires, rods, etc. each having different components, to form a composite metal material. This technology was developed to solve the problem, consumes less energy, does not require the entire device to be placed in a non-oxidizing atmosphere, can be carried out without being restricted by the thickness of the bonding material, and can produce high-quality products. It is an object of the present invention to provide a method and apparatus for manufacturing a composite metal material that can be manufactured reliably.

SUMMARY OF THE INVENTION The present invention provides that each of a plurality of materials being fed to a crimp roll is provided with a selected voltage polarity such that a short circuit current flows between the materials under the crimp roll, particularly through the contact location. The method is characterized in that crimping is performed while continuously passing a current.

If this is explained in detail according to FIG. 1(a), the pressure roll 1
When joining and crimping materials A and B made of metal materials for bonding fed into the space between a and lb (hereinafter simply referred to as the crimping roll 1) with the crimping roll 1, the present invention provides the crimping roll 1.
For example, if the current I flowing through the material A flows in the direction of the crimping roll 1 as shown by the arrow, the flow of the current I is shown as a black dot T below the crimping roll 1.

A selected voltage polarity is applied to each material A, B such that it flows into material B through the meeting/contact location of B and material B flows in the feed direction. The above can be achieved by using single-phase alternating current or direct current,
Furthermore, if materials A, B, and C are to be joined, this can be achieved by using three-phase alternating current.

(Function of the Invention) In the present invention, the current ■ flows concentratedly through the contact side surface layer of each material at the contact position as shown in FIG. 1(a), and FIG. As seen in b), the surfaces of both members A and B, which have microscopic irregularities, come into local contact at the convex portions at the beginning of their meeting, and the current ■ flows intensively at that location, increasing the contact resistance. , and sometimes local discharge phenomena also occur. Therefore, even if the heating temperature characteristic curves due to energization of the two members A and B are set to be solid line A as shown in FIG. 1(c), only the contact resistance of the contact resistance Due to the discharge phenomenon, the temperature rises to a high temperature close to the melting point TM, as indicated by the broken line, and the material softens.

Therefore, in the present invention, (a) Even if the heating temperature of the entire material is kept at a relatively low temperature where oxidation can be ignored, only the bonding surface layer is instantly brought to the desired high temperature, and the pressure bonding by the reduction blade of the pressure roll is performed. Actions that can be performed effectively (b) Actions that can be performed on the welding target without being restricted by the thickness dimensions of the materials because the current is reliably concentrated on the joining surface layer, (C)
Only the bonded surface layer of each material is instantly heated to a high temperature,
Since it only softens, it is possible to maintain the original size of each material while making sure that the pressure roller has a large reduction blade.
It has the ability to form a strong bond.

(Example: 1) An example of an apparatus implementing the present invention is shown in FIGS. 2(a) and 2(b).

In FIG. 2(a), 1 is a pressure roll composed of rolls a and b, 2a and 2b are pressure backup rolls that respectively secure the rolling blades of the pressure roll 1, and 3a and 3b are metal materials for joining, respectively. A and B are wound material feeding devices, and 4 is a winding device for the composite metal material CM.

Along the feeding path Ll of the material A that is rewound from the material feeding device 3a and fed into the pressure bonding roll 1, the material A is
An energized roll 5a consisting of paired rolls c and d sandwiching the
However, along the feeding path L2 for the material B that is rewound from the material feeding device 3b and sent to the pressure bonding roll 1, energized rolls 5b consisting of paired rolls e and f are arranged, respectively, so as to sandwich the material B. .

Between the energizing roll 5a and the pressure bonding roll 1 in the feeding path Ll,
Annular transformers 6a and 6b each having a predetermined length are disposed between the energizing roll 5b and the pressure roll 1 in the feed path L2. The transformer 6a
, 6b are shown in Fig. 2 (if the material is, for example, a strip material).
As shown in b), it is composed of an iron core 61 made of magnetic materials such as silicon steel plates in a rectangular shape and laminated to a predetermined length, and a primary winding 62 wound around the inner and outer peripheral surfaces of the iron core 61. It is used as a passage for materials.

When power is supplied to the primary windings 62 of each of the transformers 6a and 6b from two predetermined heating power sources (not shown), for example, if the heating power source is a single-phase AC, for example, the power to the transformer 6a will be instantaneously increased. The power supply induces a current {circle around (2)} in the material A passing through the ring of the transformer 6a from the direction of the current-carrying roll 5a toward the pressure roll 1 as shown by the arrow, and the power supply to the transformer 6b passes through the ring of the transformer 6b. The connection structure is such that a current I is induced in the material B from the pressure roll 1 direction to the power supply roll 5b direction as shown by the arrow.

In the figure, 7a and 7b are on the outer periphery of the transformer 6a, and 7c and 7d are on the outer periphery of the transformer 6b, respectively.
These are electrically conductive members made of, for example, copper material, which are arranged in parallel and close to each other so as to maintain a substantially symmetrical relationship with respect to the center. One end of the conductive members 7a and 7b on the current-carrying roll 5a side is connected to the current-carrying roll 5a via a transducer S, and one end of the conductive members 7c and 7d on the current-carrying roll 5b side is connected via a transducer S to the current-carrying roll 5a. It is connected to the current supply roll 5b. The other end of the conductive member 7a is connected to the other end of the conductive member 7d, and the other end of the conductive member 7b is connected to the other end of the conductive member 7C.

The connection configuration of the conductive members 7a to 7d is as follows:
Coupled with the above-described power supply circuit configuration to each of transformers 6a and 5b, it is possible to cancel the ampere turns on the primary side of each of transformers 6a and 6b.

Furthermore, by setting the cross-sectional area and other specifications to predetermined values for the conductive members 7a and 7b in relation to the material A, and for the conductive members 7c and 7d in relation to the material B, the resistance of the material to the current I is determined. R1 and the resistance R of the conductive member 7
2 is set so that R1>>R2.

If we look at the above configuration as an electric circuit, the instantaneous power supply from the power source to the transformers 6a and 6b induces a current I in the direction of the arrow in each of materials A and B, so the electric current flowing through material A is down, in particular through the contact position to the material B, and then to the roll e of the current-carrying roll 5b.
, f, and then branched to the conductive members 7c and 7d via the conductor S, and the current () flowing to the conductive member 7c flows from the conductive member 7b connected thereto through the conductor S to the roll of the current-carrying roll 6a. The current I flowing to the conductive member 7d flows from the conductive member 7a connected thereto to the roll C of the current-carrying roll 6a via the conductor S, and from the current-carrying roll 6a to the material A.
The secondary circuit is closed.

In this way, there is one pressure roll between materials A and B.

In particular, a short-circuiting current flows through the contact position, and according to the above-mentioned action, only the bonding surface layer involved in bonding is heated to the required high temperature and softened, and the materials A and B are bonded to the crimping backup roll 2.
Only the bonding surface layer is plastically deformed by the large rolling blade of the pressure bonding roll 1 equipped with a crimping roll 1, and the bonding is firmly bonded, resulting in a composite metal material. Moreover, since the softened part is added only to the surface layer on the joint side,
Even if a large reduction blade is applied, a composite metal material CM that substantially maintains the original dimensions of each of materials A and B can be obtained.

Further, the heating temperatures of the materials A and B themselves are low, and the bonding surface layer is heated to a high temperature only for a very short period of time and is immediately bonded, so there is almost no time for oxidation. Therefore, it is not necessary to place the entire device in a non-oxidizing atmosphere.

If complete oxidation prevention is intended, it is sufficient to use a nozzle 8 to blow an inert gas such as argon gas toward the contact position of materials A and B.

Furthermore, in addition to the above operations and effects, the device of this embodiment also has the following features:
Since a secondary circuit is configured with the conductive member 7 having low electrical resistance as the current return line, it is possible to effectively heat materials A and B with high electrical resistance, and the supply voltage is applied to each material as a load current. Since the no-load voltage disappears and no leakage occurs to the outside, there is no need for insulation measures for the equipment.Furthermore, the impedance of the secondary side with respect to the negative side is low, and the voltage is reduced. The effect of reducing fluctuations,
Effects etc. will be erased.

A specific example of manufacturing a composite metal material CM using the apparatus will be disclosed below.

☆ Manufacturing conditions * Metal material for joining Material A: Thin steel plate Material B Stainless steel plate Both materials 0.6 tm thick, 1000 wm width * Distance between energizing roll and crimping roll (center distance) Material A side, B side both 1m *Material feed speed: both g1m/min *Power supply current: 6
0000A *Heating temperature on the inlet side of the pressure roll Material A: 600”C Material B near 00°C Main pressure roll configuration pressure roll: 100nφ However, ceramic coating (spraying) Roll pressure bonding backup roll: 350nφ However, metal roll *Reducing force: 60ton ☆Obtained composite metal material *Joining shear strength: 35±5kg/1II2 Comparative example: JI
S standard SUS cladding is stipulated to be 20 dazzles/Tsuru 2 or higher *90° bending test: No peeling at all * Composite material thickness: 1.12m (M plate 1ito, 56 Tsuru, stainless steel layer 0.56m) (Example: 2) Another embodiment of the present invention is shown in FIG.

In the figure, 1 is a pressure roll consisting of rolls a and b;
la, 2b are crimping backup rolls, 3a, 3b
4 is a material feeding device around which metal materials A and B for bonding are wound, and 4 is a winding device.

Along the feeding path Ll of the material A that is rewound from the material feeding device 3a and fed into the pressure bonding roll 1, there is an energized roll 5a consisting of a pair of rolls c and d that holds the material A therebetween. This embodiment is similar to Embodiment 1 in that along the feeding path L2 of the material B returned and sent to the pressure bonding roll 1, an energized roll 5b consisting of a pair of rolls e and f is arranged so as to sandwich the material B therebetween.

However, in this embodiment, the above-mentioned energizing rolls 5a and 5b
is directly supplied with power from the energizing heating power source E via the device S.

Therefore, the instantaneous current 9, for example, flowing from the power supply E to the current-carrying roll 5a via the driver S, flows through the material A in the direction of the arrow, between the materials A and B under the crimping roll 1, especially at the contact position. The bonded surface layer of each material is short-circuited, and the material B flows into the material B, and the material B moves in the direction of the arrow to reach the energizing roll 5b, and returns to the power source E via the distributor S from the energizing roll 5b.

In this case as well, when the current I flows through the joint surface layers of materials A and B at the contact position, it softens only the surface layer of each material by heating it to an extremely high temperature compared to the temperature of the materials themselves. Only the surface layer is plastically deformed by the large rolling blade of the roll 1 to complete the joining.

Similarly to Example 1 above, it is preferable to blow an inert gas toward the joint to prevent oxidation of the joint.

In the case of the apparatus of this embodiment, the material feeding devices 3a and 3b, the pressure roll 1. In order to prevent leakage current from flowing from each of the @removal devices 4 through the mechanical equipment of the drive device 1 to the ground, it is essential to insulate all equipment electrically connected to materials A and B from the ground. In this respect, it is inevitable that the equipment will be more complicated than in the case of Example 1.

A specific example of manufacturing a composite metal material CM using the apparatus of this embodiment will be shown below.

☆ Manufacturing conditions * Metal material for joining Material A: Copper plate 0.6 x * thickness, 500 m width Material B: Steel plate 2.41 thickness, 500 n width * Distance between energizing roll and pressure roll (center distance) Material A side - --------・-・2.9
m Material B (UIJ---3,4m * Current: 30000A * Material feeding speed: 30m/min for both Heating temperature at the entrance side of the water pressure roll Material A: 500°C Material B: 650° C Hydraulic roll configuration Crimping roll = 100 dragon φ However, ceramic coating ('/g injection) roll crimping backup roll: 350 mm φ However, metal roll hydraulic lower blade: 20 tons ☆ Obtained composite metal material * Bonding shear strength: 18 ± 3 kg/w 2*90°
Bending test: No peeling at all * Composite material thickness: 2.911 (copper plate layer 0.521 m, steel plate layer 2.381 m) (Example: 3) As an example of the present invention, an example of an apparatus for joining three materials was further described. Shown in FIGS. 4(a) and (b).

In FIG. 4(a), 1 is a pressure roll consisting of rolls a and b, 2a and 2b are pressure back-up rolls, 3a,
3b and 3c are material feeding devices around which metal materials A, B, and C for joining are wound, 4 is a winding device, and 5a to 5c are arranged along feeding paths L1 to L3 for materials A to C, respectively. vs. rolls C and d, e
The energizing rolls 6a to 6c consisting of , f, g, and h are the energizing rolls 5a to 5c, respectively, as in Example 1.
An annular transformer disposed between the pressure rolls 1 and 7a
7f are the same conductive members disposed around the outer periphery of each of the transformers 6a to 6C as in Embodiment 1, and S is a diode.

In this embodiment, as shown in FIG. 4(b), power is supplied from the three-phase AC power source E3 to each of the transformers 6a to 6C, and the conductive members 7a to 7f are connected to one of each of the transformers 6a to 6C as shown in the figure. Connect so as to cancel the ampere turn on the next side.

Therefore, the current induced in each material A-C by power feeding from the three-phase AC power supply E3 to each of the transformers 6a to 6C constitutes the neutral point of the three-phase Y connection under the crimping roll 1, and the Meeting of materials.

Only the surface layer of the contact surface instantaneously heats up to a significantly higher temperature than the others and softens according to the above-mentioned action, so Example: 1
Similar to 2 and 2, reliable and strong bonding can be achieved with the large rolling blade of the pressure roll 1.

Of course, it goes without saying that oxidation can be completely prevented by injecting inert gas from the nozzle 8 toward each joining position.

(Other Embodiments) In Embodiment 3, instead of using the three-phase AC power source E3, for example, the transformers 6a and 6C are supplied with power from the single-phase AC power source, and the transformer 6b is abolished and another heating source, ie, the material The material may be heated to a predetermined temperature (in this case, the heating temperature may be low) by a radiation heater, induction heating, direct current heating, etc., or it may be configured to be fed to the pressure roll 1 without heating at all, and the present invention included in the range.

In addition, although the above Examples 1 to 3 have been described with reference to the case where the circumferential surface of the pressure roll 1 has the same diameter in the longitudinal direction, the scope of the present invention also includes a case where the circumferential surface is uneven in the longitudinal direction and locally bonded. Of course, it is included in

Furthermore, the present invention is of course applicable to materials having different sizes such as thickness and width, and is also applicable to elongated shapes as long as at least the surfaces on the joining side can come into contact with each other.

(Effects of the Invention) The present invention greatly reduces energy consumption during manufacturing due to the above-mentioned effect f3), does not require the entire device to be in a non-oxidizing atmosphere, and also eliminates the need for cooling equipment, which reduces equipment costs. The effect of reducing running costs is maximized.

Furthermore, the present invention has seven effects that can be implemented regardless of the thickness of the bonding material.

Furthermore, the present invention has the effect of making it possible to manufacture products of approximately the original size of each material from the above-mentioned effect (C).

As described above, the effects of the present invention are numerous and remarkable, and are highly prized.

[Brief explanation of the drawing]

FIG. 1(a) is a front view of the pressure roll portion for explaining the principle of the composite metal material manufacturing method of the present invention, and FIGS. 1(b) and (c)
2(a) is a front view of the apparatus of Example 1 of the present invention, and FIG. b) is a sectional view taken along the line X-X in FIG. 2(a), FIG. 3 is a front view of the device of Example 2, and FIG. 4(a) is a front view of the device of Example 3 of the present invention. , FIG. 4(b) is a power supply circuit diagram of FIG. 4(a), and FIGS. 5(a) to 5(C) are front views of the conventional composite metal material manufacturing apparatus. 1−−1−・−−−−1−・−1−−−−−−−−−
---------1----Crimping rolls 3a, 3b, 3c
---Material feeding devices 5a, 5b,
5 c----One energizing roll 6 a, 6 b
, 6 c--------) Lances 7a to 7f---1------ Conductive members A, B, C----
−−−−−−−−−−・−Material CM・−1−−−−−−
---
-········Contact position Ll, L2. L3-・-Feed passage s---------1・----1-----・-m--~
~-------・-Eisho E, E3・--1--・----
1. - Power supply patent applicant: Nippon Steel Corporation Patent applicant: Koshuha Netoren Co., Ltd.

Claims (1)

[Scope of Claims] 1) In the process of feeding a plurality of continuously fed metal materials to a pressure roll and crimping them to form a composite metal material, crimping is applied to each of the plurality of metal materials fed to the pressure roll. 1. A method for producing composite metal materials, characterized in that crimping is carried out under the rolls, in particular through the contact points, while continuously passing a current with a selected voltage polarity such that a short-circuit current flows between the materials. 2) A device that feeds a plurality of continuously fed metal materials to a crimping roll and crimps them to form a composite metal material is capable of sandwiching the materials between the feeding device for each of the plurality of materials and the crimping roll. In addition to arranging an energizing roll, an annular transformer of a predetermined length is arranged between the energizing roll and the crimping roll, the inside of the ring is used as a material feeding path, and the material feeding path is centered around the outer periphery of the transformer. One or more conductive members that maintain almost symmetry are arranged close to each other in parallel, one end of the conductive member facing the current-carrying roll is connected to the current-carrying roll via a transducer, and the other end is connected to the outer periphery of another transformer. The other end of the arranged conductive member and each transformer are connected so as to cancel out the ampere turns on the primary side of the transformer, and the relationship between the resistance R1 of the material and the resistance R2 of the conductive member with respect to the current flowing in each transformer. was set so that R1 >> R2, and the current was set to flow in the direction in which a short circuit current flows between the materials under the crimping roll, particularly between the materials at the contact position, for each material on the feeding side to the crimping roll. A manufacturing device for composite metal materials characterized by: 3) A device that feeds a plurality of continuously fed metal materials to a pressure roll and presses them to form a composite metal material is capable of sandwiching the materials between the feed devices for each of the plurality of materials and the pressure roll. The energizing rolls are arranged, and each of the energizing rolls and the energizing heating power source are connected so that the direction of the current flowing through each material is short-circuited between the materials under the crimping roll, especially between the materials at the contact position. Features: Composite metal material manufacturing equipment.