JP2008188647A - Method of manufacturing dimpled tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a method of manufacturing a dimpled tube by which slip between a roller and a belt-like material is suppressed and the state of wear of the roller is easily determined only by the visual observation of the appearance of the manufactured tube. <P>SOLUTION: By forming knurled part 10 having a prescribed width on the whole circumference of the middle part in the axial direction of a projection roller 4A which is used in a dimple forming stage P1 and carving a knurled pattern 11 in the length direction of the surface 3f of the belt-like material 3 with the knurled part 10, the slip between the projection roller 4A and the belt-like material 3 is suppressed with the knurled part 10 and dimples 5 formed on the belt-like material 3 can be stably provided at pitches according to the original setting. Because the worn state of the projection roller 4A can be judged by the state of wear of the knurled pattern 11, the wear of the projection roller 4A can be checked without stopping a manufacturing equipment 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a tube with dimples having concave dimples formed on the surface thereof.

  A heat exchanger such as a radiator or an evaporator communicates with a pair of tanks arranged opposite each other at a predetermined interval with a plurality of parallel tubes, and fills between adjacent tubes with corrugated fins, thereby interposing the tubes. As the heat exchange fluid passes from one tank to the other tank, the heat exchange fluid exchanges heat with the air passing through the corrugated fins.

  At this time, heat exchange is performed between the tube itself and the air, and the surface of the tube is generally formed as a smooth flat surface. The heat exchange rate by the tube can be increased. For this reason, conventionally, there is a tube with dimples in which a large number of dimples (concave portions) are formed on the surface of the tube, and Patent Document 1 proposes an apparatus and method for manufacturing the tube with dimples.

  That is, in the manufacturing apparatus disclosed in Patent Document 1, after forming dimples into a strip-shaped material, continuously forming a tube while winding it, and cutting the continuous tube into a predetermined length. A dimpled tube is manufactured. Therefore, the manufacturing apparatus includes a dimple forming unit, a tube forming unit, a moving amount measuring unit for the strip-shaped material, and a tube cutting unit.

At this time, the dimple forming part includes a convex forming roller (convex roller) disposed on the front surface side of the belt-like material and a concave forming roller (concave roller) disposed on the back surface side. The dimples are formed by sandwiching the belt-like material and engaging the convex and concave rollers.
JP 2004-205111 A

  However, in the conventional method for manufacturing a tube with dimples, the belt-like material is sequentially fed in a state of being sandwiched between the convex roller and the concave roller, so that the convex roller and the concave roller have a friction between the belt-like material. Rotational force is input through the force and the meshing part of both rollers, but in the section deviating from the meshing part, the rotational force is input to both rollers only by the frictional force due to the pressure contact with the belt-like material.

  For this reason, in the section where the roller is rotated only by the frictional force with the belt-like material, there is a risk of slippage between the belt-like material and the roller, and in this case, the preset dimple pitch changes. Become.

  In addition, the dimple molding of the belt-like material is performed at the meshing portion of the convex roller and the concave roller. However, these rollers, particularly the convex roller, wear the convex portion when used for a long time, and the concave portion such as the depth and inner diameter of the dimple. The shape will change (decrease).

  However, it is impossible to accurately determine the change (wear) in the concave shape of the dimple just by visually observing the tube with the dimple that has been commercialized. As a result, the manufactured tube is cut and the dimple is cut. The shape of the lens is optically measured, or the roller is removed from the apparatus and the convex portions and concave portions thereof are measured. The measurement work takes a long time and the manufacturing apparatus is stopped during that time. Therefore, work efficiency will deteriorate.

  Then, this invention aims at obtaining the manufacturing method of the tube with a dimple which can suppress the slip with a roller and a strip | belt-shaped material, and can confirm the abrasion condition of a roller more easily. .

  In the invention according to claim 1, the belt-like material (3) is sandwiched between the convex roller (4A) arranged on the front surface side and the concave roller (4B) arranged on the back surface side, and these convex rollers (4A) and the concave roller (4B) meshing with each other, a dimple forming step (P1) for forming dimples (5) on the surface (3f) of the strip (3), and a strip (3) formed with dimples (5). ) Is wound into a tube shape, and the measuring roller (6) is brought into contact with the surface of the strip-shaped material (3) wound in the tube shape to move the strip-shaped material (3). A workpiece moving amount measuring step (P3) for measuring the amount, and a tube cutting step for cutting the strip (3) wound in a tube shape into a predetermined length based on the measurement value of the measuring roller (6) ( P4), and a tube with dimples In the manufacturing method, a knurl (10) having a predetermined width is formed on the entire circumference of a part of the axial direction of the convex roller (4A), and a strip-like material (3) is formed by the knurl (10) in the dimple forming step (P1). ) Is provided with a belt-like knurled pattern (11).

  The invention described in claim 2 is characterized in that the maximum depth (d) of the knurled pattern (11) is not less than 3 percent and not more than 20 percent of the plate thickness (t) of the strip-like material (3).

  According to the first aspect of the present invention, when the dimple is formed on the surface of the belt-like material by the engagement of the convex roller and the concave roller in the dimple forming step, the convex roller is formed on the entire circumference of a part in the axial direction. A knurled pattern can be engraved on the surface of the belt-like material by the knurling. At this time, the convex roller and the belt-like material are surely brought into contact with each other via the knurling. For this reason, it is possible to more reliably suppress slippage between the roller and the belt-like material, and to form the dimples at a pitch as originally set for the belt-like material.

  In addition, from the state of the knurled pattern, it is possible to easily confirm the wear state of the knurled and hence the convex roller.

  Furthermore, in the workpiece movement measurement process, a high frictional force can be obtained by keeping the measurement roller in contact with the knurled pattern, so that the measurement roller movement can be reduced and the workpiece movement can be measured more accurately. can do.

  According to invention of Claim 2, durability of a product and visibility of a knurled pattern can be made compatible.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is an explanatory view showing a manufacturing process of a dimpled tube according to the present embodiment, FIG. 2 is a perspective view of the dimpled tube, FIG. 3 is an enlarged perspective view showing a dimple forming process, and FIG. 4 is a dimple forming process. 5 is an enlarged perspective view of a convex roller and a concave roller used in the process, FIG. 5 is a plan view of the main part of the belt-like material that has passed through the dimple forming process, and FIG. 6 is an enlarged cross-sectional view taken along line AA in FIG.

  The method for manufacturing a tube with dimples according to the present embodiment is described with reference to an example of a tube communicating with a pair of tanks of a heat exchanger, as shown in the description of the background art. The dimpled tube 2 shown in FIG. 2 is manufactured by the manufacturing apparatus 1 shown.

  That is, as shown in FIG. 1, the dimpled tube 2 is manufactured using a strip-shaped material 3 wound in a roll shape as a raw material, and is finally formed into a cylindrical shape having a flat cross section.

  The manufacturing apparatus 1 sandwiches the belt-shaped material 3 with a convex roller 4A disposed on the front surface side (lower surface in the drawing) and a concave roller 4B disposed on the back surface side, and as shown in FIG. A dimple forming step P1 for forming the dimple 5 on the surface 3f of the strip 3 by meshing the roller 4A and the concave roller 4B, and a tube forming step P2 for winding the strip 3 having the dimple 5 formed into a flat tube shape; A workpiece movement amount measuring step P3 for measuring the amount of movement of the belt-shaped material 3 by bringing the measuring roller 6 into contact with the surface 3f of the belt-shaped material 3 wound in a tube shape, and the belt-shaped material 3 wound in a tube shape. A tube cutting step P4 for cutting to a predetermined length based on the measured value of the measuring roller 6.

  As shown in FIG. 3, the convex roller 4A is formed in a drum shape and has a convex portion 4p that is a male shape of the dimple 5 aligned on the outer peripheral surface thereof, while the concave roller 4B is convex. Formed in the shape of a drum having the same diameter as the mold roller 4A, a concave portion 4d serving as a female mold of the dimple 5 is provided on the outer peripheral surface thereof corresponding to the convex portion 4p of the convex roller 4A.

  In the dimple forming step P1, the convex roller 4A disposed in the lower part of FIG. 1 can be moved up and down by a lifting mechanism (not shown), and the belt-like material 3 is formed into a convex shape while the convex roller 4A is lowered. By passing between the concave rollers 4A and 4B, and then raising the convex roller 4A and sandwiching the belt-like material 3 between the rollers 4A and 4B, and feeding the belt-like material 3 in this state, the convex roller 4A and The concave roller 4B forms the dimple 5 on the belt-shaped material 3 while rotating with the convex portion 4p and the concave portion 4d meshing with each other with the belt-shaped material 3 interposed therebetween.

  In the tube forming process P2, a large number of winding rollers 7, 7,... That gradually increase the amount of winding of the belt-shaped material 3 are provided, and the belt-shaped material 3 is gradually moved by the winding rollers 7, 7.. 2 to form the flat cross section shown in FIG.

  In the workpiece movement measuring step P3, the measuring roller 6 that comes into contact with the surface 3f of the strip-shaped material 3 wound in a tube shape rotates with the movement of the strip-shaped material 3, and the rotational speed is read by the rotational speed sensor 6a. Thus, the amount of movement of the belt-like material 3 can be detected.

  In the tube cutting step P4, the upper and lower cutting blades 8 and 8a for cutting the strip-shaped material 3 wound in a flat tube shape are provided, and the above-mentioned upper portion is based on the movement amount of the strip-shaped material 3 measured in the workpiece movement measuring step P3. The tube 2 with dimples shown in FIG. 2 can be manufactured by operating the lower cutting blades 8 and 8a to cut the strip 3 into a predetermined length.

  Here, in the present invention, as shown in FIG. 4, a knurl 10 is formed with a predetermined width on the entire circumference of the central portion in the axial direction of the convex roller 4A, and as shown in FIG. A knurled pattern 11 is engraved in the length direction of the surface 3f.

  That is, by forming the knurl 10 on the convex roller 4A disposed on the surface 3f side of the belt-like material 3, the knurl 10 is pressed against the surface 3f of the belt-like material 3 when the convex roller 4A is pressed against the belt-like material 3. The knurled pattern 11 can be engraved, and the knurled pattern 11 moves in the center of the band-shaped material 3 in the width direction by moving the band-shaped material 3 while the knurled 10 is pressed against the band-shaped material 3. The band is applied to the part.

  At this time, the maximum depth d of the knurled pattern 11 shown in FIG. 6 is set to be within about 3% to 20% of the plate thickness t of the strip 3 from the durability of the product and the visibility of the knurled pattern. Yes.

  With the above configuration, according to the method for manufacturing a tube with dimples of the present embodiment, when the dimple 5 is formed on the surface 3f of the belt-like material 3 by the engagement between the convex roller 4A and the concave roller 4B in the dimple forming step P1. The knurled pattern 11 can be engraved in the center portion in the width direction of the surface 3f of the belt-like material 3 by the knurl 10 formed on the entire circumference of the center portion in the axial direction of the convex roller 4A.

  At this time, the convex roller 4A and the belt-like material 3 can be more reliably brought into contact with each other via the knurl 10 formed on the entire circumference of the convex roller 4A. And the strip 3 can be more reliably suppressed. For this reason, it is possible to suppress the occurrence of a speed difference between the convex roller 4A and the belt-like material 3, and the dimples 5 formed on the belt-like material 3 can be stably provided as a pitch as initially set. .

  In addition, since the slip between the convex roller 4A and the belt-like material 3 can be suppressed in this way, the convex roller 4A and the concave roller 4B can be more reliably rotated with the movement of the belt-like material 3. In some cases, the roller 4A and the concave roller 4B do not have to be provided with a dedicated driving means. In this case, it is advantageous in terms of cost because equipment investment can be suppressed and energy consumption and maintenance time can be reduced during manufacturing. It becomes.

  Further, in the convex roller 4A that forms the knurling 10, the convex portion 4p that forms the dimple 5 and the knurling 10 are worn almost evenly. Therefore, the dimple manufactured from the knurling pattern 11 carved by the knurling 10 is used. Since the wear state can be easily determined on the appearance of the attached tube 2, and the wear state of the convex roller 4A can be determined from the wear state of the knurled pattern 11, the manufacturing apparatus 1 is stopped. It is possible to check the wear state of the convex roller 4A.

  Furthermore, in the workpiece movement amount measuring step P3, a high frictional force can be obtained by keeping the measurement roller 6 in contact with the knurled pattern 11, so that the sliding of the measurement roller 6 is further reduced and the workpiece movement amount is reduced. That is, the amount of movement of the strip 3 can be measured with higher accuracy. For this reason, in the tube cutting process P4 which cut | disconnects the strip | belt-shaped material 3 wound by the tube shape using the measured value of the said roller 6 for a measurement, the precision of the cutting length of the tube 2 can be improved more.

  Further, in the present embodiment, the maximum depth d of the knurled pattern 11, the maximum depth d of the knurled pattern 11, and the plate thickness t of the strip-shaped material 3 from the durability of the product and the visibility of the knurled pattern. Since the engraving is performed so as to be within approximately 3% or more and 20% or less, the knurled pattern 11 can be engraved more clearly while minimizing damage to the belt-like material 3.

  By the way, even in the present embodiment, during the manufacture of the tube 2 with dimples, the convex roller 4A that can be moved up and down is lowered, and the contact between the convex roller 4A and the belt-like material 3 is released. As shown by a two-dot chain line in FIG. 7, the strip-like material 3 can be provided with a dimple non-setting section 9 in which the dimple 5 is not formed over a predetermined length L.

  Then, by disposing the dimple non-setting section 9 at the end portion in the longitudinal direction of the tube 2 with dimples, the fitting and joining to a tank not shown can be performed more reliably.

  At this time, the dimple non-setting section 9 is, of course, a section in which the knurled pattern 11 is not engraved, but the length L of the dimple non-setting section 9 can be easily confirmed by the presence or absence of the knurled pattern 11, Using the position at which the knurled pattern 11 is interrupted as a cutting marker, an intermediate position C indicated by a one-dot chain line in the figure of the dimple non-setting section 9 as shown in FIG. 7 can be accurately set as a cutting position.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made. For example, the manufacturing method according to the present invention is applicable to the manufacture of tubes other than the tubes of the heat exchanger, and the cross section is not limited to a flat shape or a circle, but may be a polygonal shape, Furthermore, the knurling position is not limited to the axial center of the convex roller.

  Of course, the dimple forming step, the tube forming step, the workpiece movement amount measuring step, and the tube cutting step are not limited to those by the manufacturing apparatus 1 in FIG.

It is explanatory drawing which shows the manufacturing process of the tube with a dimple concerning one Embodiment of this invention. It is a perspective view of the tube with a dimple concerning one embodiment of the present invention. It is an expansion perspective view which shows the dimple shaping | molding process concerning one Embodiment of this invention. It is an expansion perspective view of the convex roller and concave roller used for the dimple shaping | molding process concerning one Embodiment of this invention. It is a principal part top view of the strip | belt shaped material which passed the dimple shaping | molding process concerning one Embodiment of this invention. It is an expanded sectional view along the AA line in FIG. It is a principal part top view of the strip | belt-shaped material which provided the dimple non-setting area concerning other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2 Tube with dimple 3 Strip material 3f Surface of strip material 4A Convex roller 4B Concave roller 5 Dimple 6 Measuring roller 10 Knurl 11 Knurl pattern P1 Dimple molding process P2 Tube molding process P3 Work movement amount measurement process P4 Tube cutting Process

Claims (2)

The belt-shaped material (3) is sandwiched between the convex roller (4A) disposed on the front surface side and the concave roller (4B) disposed on the back surface side, and the convex roller (4A) and the concave roller (4B). A dimple forming step (P1) for forming a dimple (5) on the surface (3f) of the strip (3) by meshing with
A tube forming step (P2) for winding the strip (3) formed with the dimple (5) into a tube shape;
A workpiece movement amount measuring step (P3) for measuring the movement amount of the strip-shaped material (3) by bringing the measuring roller (6) into contact with the surface of the strip-shaped material (3) wound in a tube shape;
In the manufacturing method of the tube with a dimple provided with the tube cutting process (P4) which cut | disconnects the said strip | belt-shaped material (3) wound by the tube shape to predetermined length based on the measured value of the said roller for a measurement (6). ,
A knurl (10) is formed with a predetermined width on the entire circumference of a part of the axial direction of the convex roller (4A), and the surface of the strip (3) is formed by the knurl (10) in the dimple forming step (P1) ( A method for manufacturing a tube with dimples, wherein a strip-shaped knurled pattern (11) is applied to 3f).   2. The dimpled tube according to claim 1, wherein the maximum depth (d) of the knurled pattern (11) is not less than 3 percent and not more than 20 percent of the thickness (t) of the strip (3). Production method.

Images