JP2008025863A - Rolling raw sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolled raw sheet capable of preventing the shortage of the height of a projection for a side wall at forming a sheet-like body for manufacturing a flat tube by rolling. <P>SOLUTION: This rolling raw sheet is used for forming the sheet-like body 20 for manufacturing the flat tube. The sheet body 20 for manufacturing the flat tube comprises upper and lower wall forming portions 21, 22, a connecting portion 23 connecting the upper and lower wall forming portions 21, 22 and forming one of side walls, and the projections 9, 11 integrally molded on a side edge on a side opposite to the connecting portion 23 of the flat wall forming portions 21, 22 and made to abut on each other when the sheet body 20 is bent into a hairpin shape by the connecting portion 23. The rolling raw sheet is composed of an aluminum brazing sheet having aluminum brazing filler metal layers on both surfaces of a core material formed of an Al-Mn alloy. The difference between the Vickers hardness of the core material at a part within 2 mm range from both ends in the width direction and the Vickers hardness of the core material of a part outside the range is 5 or smaller. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolled base plate, and more specifically, for manufacturing a flat tube for manufacturing a flat tube used as a heat exchange tube of a heat exchanger such as a condenser and an evaporator of a car air conditioner, a radiator for an automobile, and an oil cooler for an automobile. The present invention relates to a rolling base plate for forming a plate-like body by rolling.

  In this specification and claims, the term “aluminum” includes aluminum alloys in addition to pure aluminum. As a matter of course, the metal represented by the element symbol does not include the alloy.

  Recently, as a car air conditioner capacitor using, for example, a fluorocarbon refrigerant, as shown in FIG. 7, a pair of headers (40) and (41) arranged parallel to each other at an interval and both headers at both ends, respectively. (40) It is disposed in the ventilation gap between the parallel aluminum flat heat exchange pipe (42) connected to (41) and the adjacent heat exchange pipe (42), and both heat exchange pipes (42 ) Brazed aluminum corrugated fin (43), inlet pipe (44) connected to the upper end of the peripheral wall of the first header (40), and connected to the lower end of the peripheral wall of the second header (41) An outlet pipe (45), a first partition plate (46) provided in the upper position from the middle of the first header (40), and a lower position in the middle of the second header (41) The second partition plate (47), the number of heat exchange tubes (42) disposed above the first partition plate (46), the first partition plate (46) and the second partition plate (47) The number of heat exchange pipes (42) and the number of heat exchange pipes (42) arranged below the second partition plate (47) are sequentially reduced from above to constitute a passage group, and the inlet pipe The so-called multi-flow type in which the gas-phase refrigerant flowing in from (44) flows in a meandering manner in each passage group until the liquid phase flows out from the outlet pipe (45) to the liquid phase. The so-called capacitor is widely used as one that can realize high performance, low pressure loss, and super compactness in place of the conventional serpentine capacitor.

  The heat exchanging pipe (42) of the condenser is required not only to have excellent heat exchanging efficiency but also to have pressure resistance because a high-pressure gas refrigerant is introduced into the inside. Moreover, in order to reduce the size of the condenser, the heat exchange pipe (42) is required to have a thin wall and a low pipe height.

  As a flat tube used for the heat exchange tube (42) described above, one described in Patent Document 1 is known. The flat tube described in Patent Document 1 includes a pair of flat walls facing each other, both side walls straddling both side edges of both flat walls, and straddling both flat walls between both side walls and extending in the longitudinal direction. And a plurality of reinforcing walls provided at a predetermined interval, and a plurality of parallel fluid passages therein. Here, each reinforcing wall has a reinforcing wall ridge integrally formed in an inwardly protruding shape from one flat wall, and a reinforcing wall ridge integrally formed in an inwardly protruding shape from the other flat wall. It is formed by being brought into contact with each other and brazed.

  As described in Patent Document 1, such a flat tube is composed of a single metal plate as a whole, and includes two flat wall forming portions having the same width that form both flat walls. A connecting portion that connects and forms one side wall, a protruding portion for a side wall that is integrally formed in a raised shape on the side edge opposite to the connecting portion in each flat wall forming portion and forms the other side wall, and each flat A flat tube manufacturing plate-like body having reinforcing wall projections integrally formed in a protruding shape on the wall forming portion is bent into a hairpin shape at the connecting portion, and the both side wall projections are butted together and brazed to each other. At the same time, the reinforcing wall protrusions formed on one flat wall forming portion and the reinforcing wall protrusions formed on the other flat wall forming portion are brought into contact with each other and brazed to each other.

  The flat tube manufacturing plate-like body described above has, for example, a rolled base plate made of an aluminum brazing sheet provided with a brazing filler metal layer on both sides, and annular grooves for forming side wall ridges and reinforcing wall ridges. It is manufactured by rolling with a rolling device provided with a first work roll formed over the entire circumference and a second work roll having a cylindrical surface.

  However, in the flat tube manufacturing plate-like body manufactured by the above method, the height of the side ribs may be insufficient. If the height of the side wall ridges is insufficient, the butt of the side wall ridges when the flat tube manufacturing plate-like body is bent into a hairpin shape at the connecting portion is not stable, and as a result, the cross-sectional shape of the manufactured flat tube May not have a predetermined shape. Moreover, in order to eliminate the above-described height deficiency of the side ridges, it is necessary to increase the rolling reduction during rolling. In this case, however, there is a problem that a large burden is imposed on the rolling mill and the work roll.

Therefore, as a result of intensive research on the cause of insufficient height of the side wall protrusions in the flat tube manufacturing plate body manufactured by the above method, the present inventors have found that the mechanical properties of the rolling base plate are in the width direction. It has been found that the height of the ridges for the side wall described above is insufficient due to the difference between the two. That is, the rolling base plate described above is manufactured by rolling a wide raw metal plate made of an aluminum brazing sheet having an aluminum brazing material layer provided on both sides of an aluminum core, and then slit the raw metal plate to a predetermined width. It is made by doing. In this slitting, both sides of the portion to be slit are pressed from above and below, so the pressed portion is work-hardened, and the Vickers hardness of the core material at both ends in the width direction of the obtained rolled base plate However, it becomes too hard compared with other parts, and as a result, the filling of the material into the annular groove for forming the side ribs of the first work roll becomes insufficient at the time of rolling. I found that the height of the. Such insufficient height of the side wall ridges is likely to occur when the height of the side wall ridges is 1.5 times or more the thickness of the flat wall forming portion.
JP 2006-78163 A

  The object of the present invention is to provide a rolling base plate that solves the above-mentioned problems and can prevent the height of the protruding ribs for the side walls from being insufficient when the plate-like body for manufacturing a flat tube described above is formed by rolling. It is in.

  This invention is completed based on the knowledge mentioned above, and consists of the following aspects.

1) The whole is made of a single metal plate and is opposite to the connecting portions in the two flat wall forming portions, the connecting portions connecting the flat wall forming portions and forming one side wall, and the connecting portions in each flat wall forming portion. A flat tube manufacturing plate shape that is integrally formed so as to protrude in the same direction at the side edge of each side and that has protruding ribs for side walls that abut against each other when the metal plate is bent into a hairpin shape at the connecting portion A rolling base plate for forming a body by rolling,
It consists of an aluminum brazing sheet in which an aluminum brazing material layer is provided on at least one side of a core material made of an Al-Mn alloy, and the brazing material layer surface is a side ridge forming surface on which side wall ridges are integrally formed. The rolling base plate in which the difference between the Vickers hardness of the core material at both end portions in the width direction and the Vickers hardness of the core material in other portions excluding both end portions in the width direction is 5 or less.

  2) A rolling base plate for forming a flat tube manufacturing plate, in which the ridges for both side walls are integrally formed within a range of 2 mm from both ends in the width direction, and within a range of 2 mm from both ends in the width direction The rolling base plate according to 1), wherein the difference between the Vickers hardness of the core material in the portion and the Vickers hardness of the core material in the portion outside this range is within 5 or less.

  3) The rolling base plate according to 1) or 2), comprising an aluminum brazing sheet made of an Al—Mn alloy and having an aluminum brazing material layer on both sides.

  4) The above 1) or 2) comprising an aluminum brazing sheet provided with an aluminum brazing filler metal layer on one side of an Al-Mn alloy core and a sacrificial corrosion layer made of an Al-Zn alloy on the other side. Rolling base plate.

  5) The rolled base plate according to any one of 1) to 4) above, wherein at least the core of the aluminum brazing sheet has a recrystallized structure.

  6) The rolling base plate according to any one of 1) to 5) above, wherein annealing is performed after the wide raw metal plate made of the aluminum brazing sheet is slit to a predetermined width.

  7) A method for producing a rolled base plate as described in 1) above, wherein a wide raw metal plate comprising an aluminum brazing sheet provided with an aluminum brazing material layer on at least one surface of an Al-Mn alloy core material is provided. A method of manufacturing a rolled base plate, characterized by performing annealing treatment by slitting to a predetermined width and heating at 350 to 430 ° C. for 1 to 4 hours.

  In the manufacturing method of the rolled base plate of the above 7), the heating temperature at the time of annealing treatment is limited to 350 to 430 ° C. The reason why the core material of the aluminum brazing sheet forming the raw metal plate is less than 350 ° C. When the crystallization is insufficient and the temperature exceeds 430 ° C., the aluminum brazing material forming the brazing material layer is easily diffused into the core material, and the flat tube is formed from the flat tube manufacturing plate made of the rolling base plate. This is because the brazability during production is reduced. Moreover, the reason for limiting the heating time at the time of annealing treatment to 1 to 4 hours is that the core material is insufficiently softened at both ends in the width direction when it is less than 1 hour, and even if it exceeds 4 hours, This is because the effect remains the same and becomes uneconomical.

  8) The manufacturing method of the rolling base plate according to 7) above, wherein the annealing treatment is performed by heating at 150 to 250 ° C. for 1 to 4 hours before slitting the raw metal plate to a predetermined width.

  In the manufacturing method of the rolling base plate of the above 8), the heating temperature at the time of the annealing treatment is limited to 150 to 250 ° C. If the temperature is less than 150 ° C., the core material is insufficiently softened, and 250 ° C. If it exceeds, it will be too soft and subsequent slitting will be difficult. Moreover, the heating time during the annealing treatment was limited to 1 to 4 hours, and the softening of the core material was insufficient when it was less than 1 hour, and the effect of annealing did not change even after exceeding 4 hours, Because it becomes uneconomical.

  9) Plates for producing flat tubes formed by rolling the rolling material described in any one of 1) to 6) above are bent into hairpins at the connecting portions, and the side wall ridges are And the protruding ribs for the side walls are brazed to each other, a pair of flat walls facing each other is formed by both flat wall forming portions, and one side wall is formed by the connecting portion and brazed to each other A flat tube in which the other side wall is formed by the side ribs.

  10) Reinforcing wall ridges projecting to the other flat wall are formed on one flat wall, and reinforcing wall ridges projecting to the other flat wall are formed on the other flat wall. The flat tube as described in 9) above, wherein a reinforcing wall for partitioning the interior into a plurality of fluid passages is formed by a protruding wall for reinforcing wall of the wall.

  11) The flat tube as described in 10) above, wherein the ridges for reinforcing walls of both flat walls are abutted and brazed to each other.

  12) A plurality of heats composed of a pair of headers arranged parallel to each other at a distance from each other and the flat tubes described in any one of the above 9) to 11) and having both ends connected to both headers. A heat exchanger comprising an exchange pipe and fins that are arranged in a ventilation gap between adjacent heat exchange pipes and brazed to the heat exchange pipe.

  13) A refrigeration cycle comprising a compressor, a condenser, an evaporator, and a decompressor, and using a chlorofluorocarbon refrigerant, wherein the condenser comprises the heat exchanger described in 12) above.

  14) A supercritical refrigeration cycle equipped with a compressor, gas cooler, evaporator, decompressor, and intermediate heat exchanger that exchanges heat between the refrigerant coming out of the gas cooler and the refrigerant coming out of the evaporator, and using a supercritical refrigerant. A supercritical refrigeration cycle, wherein the gas cooler comprises the heat exchanger described in 12) above.

  15) A vehicle in which the refrigeration cycle described in 13) or 14) above is mounted as a car air conditioner.

  According to the rolled base plate of 1) above, it is composed of an aluminum brazing sheet in which an aluminum brazing material layer is provided on at least one side of a core material made of an Al-Mn alloy, and the brazing material layer surface is integrally formed with side wall protrusions. This is the side wall ridge forming surface to be molded, and the difference between the Vickers hardness of the core material at both end portions in the width direction and the Vickers hardness of the core material in other portions excluding both end portions in the width direction is within 5 Therefore, when this rolling base plate is rolled by the rolling device provided with the first work roll and the second work roll described above to form a flat body for producing a flat tube, the side wall of the first work roll The filling rate of the material into the annular groove for forming the ridges for use can be improved, and the height deficiency of the ridges for the side walls in the obtained plate for flat tube production can be solved. Therefore, when the flat tube manufacturing plate-like body is bent into a hairpin shape at the connecting portion, the butt of the ribs for the side wall is stabilized, and as a result, the cross-sectional shape of the manufactured flat tube is made a predetermined shape. Thus, the pressure resistance of the flat tube and the pressure resistance of the heat exchanger using the flat tube are improved. In addition, it is not necessary to increase the rolling reduction during rolling, and the burden on the rolling mill and the work roll can be reduced.

  According to the rolling base plate of 2), it is possible to effectively eliminate the insufficient height of the side wall in the flat tube manufacturing plate-like body obtained by rolling the rolling base plate.

  According to the rolled base plate of the above 5), since at least the core material of the brazing sheet has a recrystallized structure, the side wall of the flat tube manufacturing plate obtained by rolling the rolled base plate Insufficient height can be effectively eliminated.

  According to the rolling base plate of the above 6), even when the hardness of both ends in the width direction of the rolling base plate is increased by causing work hardening when slitting the wide base plate of the aluminum brazing sheet, It softens by annealing after slitting, and as a result, the difference between the Vickers hardness of the core material at both end portions in the width direction and the Vickers hardness of the core material in other portions excluding both end portions in the width direction becomes small.

  According to the manufacturing method of the rolling base plate of the above 7), a wide raw metal plate made of a brazing sheet having an aluminum brazing material layer provided on at least one side of a core material made of an Al-Mn alloy is set to a predetermined width. The portion that has undergone work hardening when slitting is recrystallized by annealing at 350 to 430 ° C. for 1 to 4 hours, and the core material has a recrystallized structure. Therefore, the difference between the Vickers hardness of the core material at both end portions in the width direction and the Vickers hardness of the core material at other portions excluding both end portions in the width direction can be reduced to 5 or less.

  According to the method for producing a rolled base plate of 8) above, since the raw metal plate is subjected to an annealing treatment by heating at 150 to 250 ° C. for 1 to 4 hours before slitting to a predetermined width, the raw metal plate Softens and can be easily slit.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show a flat tube manufactured using a flat tube manufacturing plate formed from a rolled base plate according to the present invention, and FIG. 3 shows a flat tube manufactured from a rolled base plate according to the present invention. 4 shows an apparatus for forming a flat tube manufacturing plate from a rolled base plate by rolling, and FIG. 5 shows a part of a process for manufacturing a flat tube from a flat tube manufacturing plate. Indicates.

  In the following description, the upper and lower sides and the left and right sides in FIGS.

  1 and 2, the flat tube (1) is made of aluminum, and the flat upper and lower walls (2) and (3) (a pair of flat walls) facing each other and the left and right of the upper and lower walls (2) and (3) Left and right side walls (4) (5) straddling both side edges, and a covering wall (6) integrally formed on the left side edge of the upper wall (2) and covering the entire outer surface of the left side wall (4), and both left and right sides It consists of a plurality of reinforcing walls (7) that span the upper and lower walls (2), (3) and are spaced apart from each other at the intervals between the walls (4), (5), and extend in the length direction. Having a plurality of fluid passages (8). Although not shown in the figure, all the reinforcing walls (7) are provided with a plurality of communication holes through which the adjacent fluid passages (8) pass so as to form a staggered arrangement as viewed from above. Yes.

  The left side wall (4) is integrally molded in a raised shape upward from the left side edge of the lower wall (3) and the side wall protrusion (9) integrally formed in a raised shape from the left side edge of the upper wall (2). The side wall ridges (11) are formed by brazing the tips with each other being butted together. The end portions of the ridges (9) and (11) for both side walls are abutted in a phase-out manner. That is, the tip of the side wall ridge (9) of the upper wall (2) is shaped such that the left half is cut off, and the side wall ridge (11) of the lower wall (3) The tip is shaped like the right half is cut off, and the protruding portion (9a) of the side wall ridge (9) of the upper wall (2) is the side wall ridge ( 11) is fitted into the notch (11b), and the protrusion (11a) of the side wall ridge (11) of the lower wall (3) is the notch of the side wall ridge (9) of the upper wall (2). It fits inside (9b). The right side wall (5) is formed integrally with the upper and lower walls (2) and (3).

  The covering wall (6) is formed by bending the covering wall forming portion formed by extending the left side edge of the upper wall (2) to the left and along the outer surface of the left wall (4). With the front end engaged with the inclined surface (3a) of the left edge of the lower wall (3), the left side wall (4), that is, the entire outer surface of the ridges for both side walls (9) (11) and The lower wall (3) is brazed to the inclined surface (3a).

  The reinforcing wall (7) includes a reinforcing wall projection (12) (13) integrally formed in a raised shape below the upper wall (2), and a reinforcing wall integrally formed in a raised shape above the lower wall (3). The projecting ridges (14) and (15) are formed by brazing the tips with each other being abutted against each other. On the upper wall (2) and lower wall (3), two types of reinforcing wall ridges (12) (13) and (14) (15) with different thicknesses are formed alternately in the left-right direction. The thick reinforcing wall ridges (12) on the upper wall (2) and the thin reinforcing wall ridges (15) on the lower wall (3) are brazed, and the upper wall (2) The thin reinforcing wall ridge (13) and the thick reinforcing wall ridge (14) on the lower wall (3) are brazed. Hereinafter, the thick reinforcing wall projections (12) and (14) on both the upper and lower walls (2) and (3) are referred to as first reinforcement wall projections, respectively, and the thin reinforcement wall projections (13) ( 15) shall be called the second reinforcing wall projections. The first reinforcing wall projections (12) and (14) of the upper and lower walls (2) and (3) are respectively extended in the length direction thereof and the second reinforcing wall of the other wall (3) and (2). Concave grooves (16) and (17) into which the tips of the projecting ridges (15) and (13) fit are formed over the entire length. And the front-end | tip part of the 2nd reinforcement wall protruding item | line (15) of the lower wall (3) is in the recessed wall (16) of the protruding item | line (12) for the 1st reinforcement wall of the upper wall (2), and the lower wall ( In the state where the tip of the second reinforcing wall projection (13) of the upper wall (2) is press-fitted into the concave groove (17) of the first reinforcing wall projection (14) of 3), both reinforcements Wall ridges (12) (15) and (13) (14) are brazed.

  The flat tube (1) is manufactured using the flat tube manufacturing plate (20) shown in FIG.

  The flat tube manufacturing plate-like body (20) is formed by rolling a rolling base plate made of an aluminum brazing sheet having a brazing filler metal layer on both sides, and has upper and lower walls (2) (3). Flat upper wall forming part (21) (flat wall forming part) and lower wall forming part (22) (flat wall forming part) having the same width and the same thickness as each other, and upper and lower wall forming parts (21) ( 22) The connecting portion (23) that connects the two together and forms the right side wall (5), and the opposite side of the connecting portion (23) in the upper wall forming portion (21) and the lower wall forming portion (22) Side wall ridges (9) and (11) which are integrally formed in a raised shape above the side edge and form the left side wall (4), and the side opposite to the connecting portion (23) in the upper wall forming portion (21) Left and right on the covering wall forming part (24), the upper wall forming part (21), and the lower wall forming part (22) formed by extending the edge (right edge) outward in the left-right direction (right) At a predetermined interval above A plurality of first and second reinforcing wall projections (12), (13), (14), and (15) integrally formed in an upright shape, for the first reinforcing wall of the upper wall forming portion (21) The ridge (12) and the second reinforcing wall ridge (15) of the lower wall forming portion (22), and the first reinforcing wall ridge (14) and the upper wall forming portion (22) of the lower wall forming portion (22) The second reinforcing wall ridges (13) of 21) are in positions that are symmetrical with respect to the center line in the left-right direction of the connecting portion (23).

  Here, the side wall protrusion (9) of the upper wall forming portion (21) is the right end of the flat tube manufacturing plate (20) in the width direction, that is, the right side of the flat tube manufacturing plate (20). It is formed within a range of 2 mm from the edge. Further, as a matter of course, the side wall protrusion (11) of the lower wall forming portion (22) is formed within a range of 2 mm from the left edge of the flat tube manufacturing plate (20).

  An inclined surface (3a) inclined upward toward the left is formed on the left edge of the lower surface of the lower wall forming portion (22). The ridges (9) and (11) for the side walls of the upper and lower wall forming portions (21) have protrusions (9a) and (11a) and cutout portions (9b) and (11b), respectively, at the tip portions. The protruding portion (9a) of the side wall ridge (9) of the forming portion (21), the notched portion (11b) of the side wall ridge (11) of the lower wall forming portion (22), and the upper wall forming portion (21 ) And the protruding portion (11a) of the side wall ridge (11) of the lower wall forming portion (22), respectively, in the horizontal direction of the connecting portion (23). Is symmetrical with respect to the center line. In addition, the dimensions of the ridges (9) and (11) for both side walls, that is, the height, the overall thickness, and the thicknesses of the protrusions (9a) and (11a) are the same. A concave groove (16) into which the second reinforcing wall protrusion (15) of the lower wall forming part (22) is press-fitted into the front end surface of the first reinforcing wall protrusion (12) of the upper wall forming part (21). A ditch groove that is formed and the second reinforcing wall protrusion (13) of the upper wall forming portion (21) is press-fitted into the tip surface of the first reinforcing wall protrusion (14) of the lower wall forming portion (22). 17) is formed. The dimensions of the first reinforcing wall ridges (12) of the upper wall forming portion (21) and the first reinforcing wall ridges (14) of the lower wall forming portion (22), that is, the height, thickness, and groove ( The widths 16 and 17 are the same as the depths of the grooves 16 and 17. In addition, the second reinforcing wall projection (13) of the upper wall forming portion (21) and the second reinforcing wall projection (15) of the lower wall forming portion (22) have the same dimensions, that is, height and thickness. It is. The thickness of the covering wall forming portion (24) is equal to the thickness of the upper and lower wall forming portions (21) and (22).

  In addition, by rolling a rolling base plate made of an aluminum brazing sheet provided with a brazing filler metal layer on both sides, an upper wall forming part (21), a lower wall forming part (22), a connecting part (23), a convex for a side wall By forming the strip (9) (11), the covering wall forming portion (24), and the reinforcing wall convex strip (12) (13) (14) (15) integrally, the lower wall forming portion (22) The entire surface except for the outer side surface (left side surface) of the side wall projection (11) and the front end surface (right end surface) of the covering wall forming portion (24) is covered with a brazing material layer. In other words, the upper and lower surfaces of the upper wall forming portion (21) and the lower wall forming portion (22), the upper and lower surfaces of the connecting portion (23), and the upper and lower wall forming portions (21) and (22) of the connecting portion (23). Left and right side surfaces of the protruding part, side wall ridges (9) and reinforcing wall ridges (12), (13), (14) and (15) front and left and right side surfaces, first reinforcing wall ridges Brazing material layers on the inner peripheral surfaces of the grooves (16) and (17) of the strips (12) and (14), the front end surface and the right side surface of the side wall protruding strips (11), and the upper and lower surfaces of the covering wall forming portion (24) (19) is formed, and no brazing filler metal layer is formed on the left side surface of the side wall protrusion (11) of the lower wall forming portion (22) and the front end surface of the covering wall forming portion (24).

  Further, in the above, the rolling base plate is composed of an aluminum brazing sheet provided with a brazing material layer on both sides, but is not limited thereto, and the brazing material is formed on one side of a core material made of an Al-Mn alloy. It may be made of an aluminum brazing sheet provided with a layer and provided with a sacrificial corrosion layer made of an Al—Zn alloy on the other surface. In this case, the brazing filler metal layer surface is the side wall ridge forming surface, on this surface the connecting portion (23), the side wall ridge (9) (11), and the reinforcing wall ridge (12) (13) (14) (15) is integrally molded.

  The plate-like body (20) for producing a flat tube is produced by the method described below.

  First, a wide raw metal plate made of an aluminum brazing sheet in which an aluminum brazing material layer is provided on both sides of an Al—Mn alloy core material is prepared. Here, the core material of the aluminum brazing sheet is formed of an alloy including, for example, Mn 0.4 to 1.5 mass%, Cu 0.01 to 0.6 mass%, and the balance Al and inevitable impurities.

  Next, after slitting the raw metal plate to a predetermined width, rolling is performed for rolling the plate (20) for flat tube production by heating at 350 to 430 ° C. for 1 to 4 hours and annealing. Manufacture base plate.

  The difference between the Vickers hardness of the core material of the aluminum brazing sheet and the Vickers hardness of the core material of the aluminum brazing sheet outside this range in a portion within a range of 2 mm from both ends in the width direction of the rolled base plate is within 5. Moreover, it is preferable that at least the core material of the aluminum brazing sheet forming the rolled base plate has a recrystallized structure. When the core material has a recrystallized structure, the Vickers hardness of the core material of the aluminum brazing sheet in a portion within a range of 2 mm from both ends in the width direction of the rolled base plate, and the core of the aluminum brazing sheet outside this range The difference from the Vickers hardness of the material tends to be within 5. The difference between the Vickers hardness of the core material of the aluminum brazing sheet and the Vickers hardness of the core material of the aluminum brazing sheet outside this range within a range of 2 mm from both ends in the width direction of the rolled base plate should be within 5 or less. For example, the core material does not necessarily have a recrystallized structure, and may be, for example, a fibrous structure. In this case, the heating temperature and the heating time in the annealing process may be outside the above-described range.

  Moreover, it is preferable to heat-treat at 150-250 degreeC for 1-4 hours, and to anneal, before slitting the raw metal plate mentioned above to the defined width.

  And the rolling base plate mentioned above is rolled using the rolling apparatus provided with the 1st and 2nd work roll (25) (26), as shown in FIG. 4, and the flat body (20) for flat tube manufacture Make.

  The first work roll (25) includes a roll body (27) and a flange (28) fixed to both ends of the roll body (27) and having a larger diameter than the roll body (27). First annular grooves (29) for forming the side wall ridges (9) and (10) are formed on both ends of the peripheral surface of the roll body (27) in the axial direction, and the peripheral surface of the roll body (27). A second annular groove (31) for forming the connecting portion (23) is formed in the central portion in the left-right direction between the first annular grooves (29) in the first and second annular grooves on the peripheral surface of the roll body (27). The first reinforcing wall ridges (12) and (14) are formed in the portion between the groove (29) and the second annular groove (31) at intervals in the axial direction of the roll body (27). A third annular groove (32) and a fourth annular groove (33) for forming the second reinforcing wall ridges (13) and (15) are formed. The cross-sectional shape of each annular groove (29), (31), (32) and (33) is as follows: ridges for side walls (9) and (11), connecting portions (23), ridges for first reinforcing walls (12) and (14) ) And the second reinforcing wall projections (13) and (15) are in conformity with the cross-sectional shape. In addition, the part on the left side of the 1st annular groove (29) which forms the protrusion (9) for side walls in the surrounding surface of the roll main body (27) of a 1st work roll (25) is a covering wall formation part (24). It has a cylindrical surface for molding.

  The small diameter part (34) is provided in the both ends of the 2nd work roll (26), and the large diameter part (35) except the small diameter part (34) in the 2nd work roll (26) is the 1st work roll. It is fitted between both flanges (28) of (25), and its peripheral surface is a processed surface (35a). An inclined surface forming portion (35b) is formed at the right end of the processed surface (35a) of the second work roll (26) so as to gradually increase in diameter toward the outside in the axial direction. A portion of the processing surface (35a) of the second work roll (26) excluding the inclined surface forming portion (35b) is a cylindrical surface.

  Then, the rolling base plate is passed between the first and second work rolls (25) and (26) of the rolling device, and the first to fourth annular grooves formed in the first work roll (25) are formed in the rolling base plate. (29) (31) (32) (33) and the inclined surface forming portion (35b) formed on the second work roll (26) are transferred, so that the plate-like body (20) for producing a flat tube is Manufactured.

  Next, a method for manufacturing the flat tube (1) using the flat tube manufacturing plate (20) will be described with reference to FIG.

  That is, the flat tube manufacturing plate (20) is sequentially folded on the left and right sides of the connecting portion (23) by roll forming (see FIG. 5 (a)), and finally folded into a hairpin shape for both side walls. The protrusions (9a) (11a) of the ridges (9) (11) and the notches (11b) (9b) are fitted together, and the tips of the second reinforcement wall ridges (13) (15) are The first reinforcing wall ridges (12) and (14) are press-fitted into the grooves (17) and (16).

  Next, the covering wall forming portion (24) is bent so that it extends along the outer surface of the ridges for both side walls (9) and (11), and the tip thereof is formed on the inclined surface (3a) of the lower wall forming portion (22). The folded body (20A) is obtained by engaging (see FIG. 5 (b)).

  Thereafter, the bent body (20A) is heated to a predetermined temperature, and the ends of the ridges for both side walls (9) (11) and the ridges for both reinforcing walls (12) (15) and (13) (14) The left side wall (4) and the reinforcing wall (7) are formed by brazing the tip portions to each other using the brazing material layer, and the right side wall (5) is formed by the connecting portion (23). The upper wall forming part (21) forms the upper wall (2), and the lower wall forming part (22) forms the lower wall (3). Further, the covering wall (6) is formed by brazing the covering wall forming portion (24) to the left side wall (4) and the inclined surface (3a) of the lower wall (3) using the brazing material layer. Thus, the flat tube (1) is manufactured.

  When the flat tube (1) is used as, for example, a heat exchange tube (42) of a condenser shown in FIG. 7, the flat tube (1) may be manufactured simultaneously with the manufacture of the capacitor. That is, the capacitor is manufactured as follows. First, a plurality of bent bodies (20A) are prepared, and a pair of aluminum headers (40) (41) having a plurality of bent body insertion holes and a plurality of aluminum corrugated fins (43) are prepared. Next, a pair of headers (40) and (41) are arranged at intervals, and the folding bodies (20A) and fins (43) of the same number as the folding body insertion holes are alternately arranged, and the folding body (20A). Are inserted into the bent body insertion holes of the headers (40) and (41). Thereafter, these are heated to a predetermined temperature, and at the same time the flat tube (1) is manufactured as described above, the flat tube (1) and the header (40) (41), and the flat tube (1) and the corrugated fin (43) are simultaneously brazed using the brazing material layer of the flat tube manufacturing plate-like body (20). In this way, a capacitor is manufactured.

  A heat exchanger provided with the above-described flat tube (1) uses a refrigeration cycle and uses a refrigeration cycle having a compressor, a condenser, and an evaporator as a car air conditioner. Used as a cycle capacitor. Moreover, it is used as an evaporator of the refrigeration cycle. Furthermore, it may be mounted on an automobile as an oil cooler or radiator having the above-described flat tube (1).

The above-described flat tube (1) uses a supercritical refrigerant such as a CO ₂ refrigerant, and combines the refrigerant that has come out of the compressor, the gas cooler, the evaporator, the decompressor, and the gas cooler, and the refrigerant that has come out of the evaporator. A supercritical refrigeration cycle having an intermediate heat exchanger for heat exchange may be used for a gas cooler or an evaporator in a vehicle mounted as a car air conditioner, for example, an automobile.

  Hereinafter, specific examples of the present invention will be described together with comparative examples.

Examples 1-5 and Comparative Examples 1-2
A raw metal plate made of an aluminum brazing sheet in which a brazing filler metal layer made of JIS A4045 alloy is clad on both surfaces of a core material made of an alloy containing Mn 0.8 mass% and Cu 0.4 mass% and the balance Al and inevitable impurities. Prepared. In addition, the clad rate of each brazing material layer is 6%.

  Next, a raw metal plate made of an aluminum brazing sheet was slit to a predetermined width, and before or after the slit, the raw metal plate was annealed to produce a rolled base plate. The thickness of the rolled base plate is 1.4 mm. Table 1 shows the annealing time and annealing conditions.

Then, while examining the crystal structure of the core material of these rolled base plates, the Vickers hardness of the core material of the aluminum brazing sheet in a portion within a range of 2 mm from both ends in the width direction of these rolled materials, and out of this range The difference from the Vickers hardness of the core material was determined. The results are also shown in Table 1.

  Thereafter, these rolled base plates were rolled at a reduction rate of 80% by a rolling device having the first and second work rolls (25) and (26) shown in FIG. 4, and the plate for flat tube production shown in FIG. I made (20).

  Then, it was examined whether or not the side wall ridges (11) of the lower wall forming part (22) were formed according to the design dimensions. As shown in FIG. 6, the design dimensions of each part of the flat tube manufacturing plate-like body (20) are the thickness (T1) of the upper and lower wall forming parts (21) and (22): 0.28 mm, 11) Height (H1): 0.45 mm, Overall thickness (T2): 0.4 mm, and Thickness (T3) of the projecting portion (11a): 0.2 mm, First reinforcing wall projection (14 ) Height (H2): 0.43 mm, wall thickness (T4): 0.27 mm, groove (17) width (W1): 0.15 mm and groove (17) depth (D): 0 15 mm, and the height (H3) of the second reinforcing wall projection (15): 0.43 mm and the wall thickness (T5): 0.17 mm. The judgment as to whether or not the side wall ridges (11) of the lower wall forming portion (21) are formed according to the design dimensions is based on the ratio of the height of the actually formed side wall ridges (11) to the design dimensions. This was done by determining (height ratio). The results are also shown in Table 1.

  As is apparent from the results shown in Table 1, the Vickers hardness of the core material of the aluminum brazing sheet in a portion within a range of 2 mm from both ends in the width direction of the rolled material, and the core material of the aluminum brazing sheet outside this range The height ratio of the ridges (11) for the side walls of the flat tube manufacturing plate (20) manufactured using the rolled base plate of Examples 1 to 5 having a difference from the Vickers hardness of 5 or less is 100%. And it was shape | molded according to the design dimension, For the side wall of the flat tube manufacturing plate-shaped body (20) manufactured using the rolling base plate of the comparative examples 1-2 whose said Vickers hardness exceeds five The height ratio of the ridges is as shown in Table 1, and it can be seen that the ridges for the side walls are not formed as designed.

It is a cross-sectional view which shows the flat tube manufactured using the plate-shaped object for flat tube manufacture formed from the rolling base plate by this invention. It is the elements on larger scale of FIG. It is a front view which shows the flat body for flat tube manufacture formed from the rolling base plate by this invention. It is a vertical sectional view which shows the rolling apparatus which rolls the rolling base plate by this invention, and forms the flat body for flat tube manufacture. It is a figure which shows a part of process of manufacturing a flat tube from the plate-shaped object for flat tube manufacture shown in FIG. It is the elements on larger scale of FIG. 3 explaining the design dimension of the plate-shaped object for flat tube manufacture. It is a perspective view which shows the capacitor | condenser for car air conditioners.

Explanation of symbols

(1): Flat tube
(2): Upper wall (flat wall)
(3): Lower wall (flat wall)
(4) (5): Side wall
(7): Reinforcement wall
(8): Fluid passage
(9) (11): Convex for side wall
(12) (13) (14) (15): Convex ridge for reinforcing wall
(20): Plate for flat tube manufacturing
(21): Upper wall forming part (flat wall forming part)
(22): Lower wall forming part (flat wall forming part)
(23): Connection part

Claims (15)

The whole is composed of a single metal plate, and two flat wall forming portions, a connecting portion connecting the flat wall forming portions and forming one side wall, and a connecting portion in each flat wall forming portion opposite to the connecting portion. A flat tube manufacturing plate-like body which is integrally formed so as to protrude in the same direction on the side edges, and which has ribs for side walls which are abutted against each other when the metal plate is bent into a hairpin shape at the connecting portion. A rolling base plate for forming by rolling,
It consists of an aluminum brazing sheet in which an aluminum brazing material layer is provided on at least one side of a core material made of an Al-Mn alloy, and the brazing material layer surface is a side ridge forming surface on which side wall ridges are integrally formed. The rolling base plate in which the difference between the Vickers hardness of the core material at both end portions in the width direction and the Vickers hardness of the core material in other portions excluding both end portions in the width direction is 5 or less. A rolling base plate for forming a flat tube manufacturing plate body in which both side wall ridges are integrally formed within a range of 2 mm from both ends in the width direction, in a portion within a range of 2 mm from both ends in the width direction The rolling base plate according to claim 1, wherein the difference between the Vickers hardness of the core material and the Vickers hardness of the core material in a portion outside this range is 5 or less. The rolling base plate according to claim 1 or 2, comprising an aluminum brazing sheet having aluminum brazing material layers provided on both sides made of an Al-Mn alloy. The rolling element according to claim 1 or 2, comprising an aluminum brazing sheet in which an aluminum brazing material layer is provided on one side of a core material made of an Al-Mn alloy and a sacrificial corrosion layer made of an Al-Zn alloy is provided on the other side. Board. The rolling base plate according to any one of claims 1 to 4, wherein at least a core material of the aluminum brazing sheet has a recrystallized structure. The rolling base plate according to any one of claims 1 to 5, wherein annealing is performed after the wide raw metal plate made of the aluminum brazing sheet is slit to a predetermined width. A method for producing a rolled base plate according to claim 1, wherein a wide raw metal plate made of an aluminum brazing sheet having an aluminum brazing material layer provided on at least one side of a core material made of an Al-Mn alloy is defined. A method of manufacturing a rolled base plate, characterized by performing annealing treatment by heating at 350 to 430 ° C. for 1 to 4 hours after slitting. The manufacturing method of the rolling base plate of Claim 7 which heats at 150-250 degreeC for 1-4 hours, and performs an annealing process before slitting the said original metal plate to the defined width | variety. The flat tube manufacturing plate-like body formed by rolling the rolling material described in any one of claims 1 to 6 is bent into a hairpin shape at the connecting portion, and the protruding ridges for the side walls are abutted against each other. In addition, the side wall protrusions are brazed, a pair of flat walls facing each other is formed by both flat wall forming portions, and one side wall is formed by the connecting portion, and the side wall protrusions are brazed to each other. A flat tube in which the other side wall is formed by a strip. One flat wall is formed with a reinforcing wall ridge protruding toward the other flat wall, and the other flat wall is formed with a reinforcing wall ridge protruding toward one flat wall. The flat tube according to claim 9, wherein a reinforcing wall that partitions the interior into a plurality of fluid passages is formed by the reinforcing wall protrusions. The flat tube according to claim 10, wherein the ridges for reinforcing walls of both flat walls are brazed so as to face each other. A pair of headers arranged parallel to each other at intervals, and a plurality of heat exchange tubes comprising the flat tubes according to any one of claims 9 to 11 and having both ends connected to both headers, respectively. A heat exchanger comprising fins that are disposed in a ventilation gap between adjacent heat exchange tubes and brazed to the heat exchange tubes. 13. A refrigeration cycle comprising a compressor, a condenser, an evaporator, and a decompressor, and using a chlorofluorocarbon refrigerant, wherein the condenser comprises the heat exchanger according to claim 12. A supercritical refrigeration cycle comprising a compressor, a gas cooler, an evaporator, a decompressor and an intermediate heat exchanger for exchanging heat between the refrigerant coming out of the gas cooler and the refrigerant coming out of the evaporator, and using a supercritical refrigerant A supercritical refrigeration cycle, wherein the gas cooler comprises the heat exchanger according to claim 12. A vehicle in which the refrigeration cycle according to claim 13 or 14 is mounted as a car air conditioner.

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