JP3818151B2 - Forming roll for sheet material with fins - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a finned sheet material forming roll for forming a finned sheet material used when an electric heating tube of a heat exchanger such as an air conditioner is manufactured by electric sewing.
[0002]
[Prior art]
In general, a copper pipe is widely used as an electric heat pipe of a heat exchanger such as an air conditioner. However, in such an electric heating tube, in order to increase the electric heating area, a large number of fins are formed on the inner peripheral portion of the tube. Conventionally, in order to manufacture such an electric heating tube with fins, A method of forming a fin on the inner periphery of the pipe by passing a plug having a groove formed on the outer periphery through the copper pipe has been adopted. Then, fins are formed in advance on the surface of the long strip material by a forming roll in which concave grooves are formed on the outer periphery of the roll body rotated around the axis, and this fin-equipped strip material is arranged in the width direction. A method of forming a tubular shape by joining the butted portions by electro-sewing after being formed into a c-shaped cross section so as to be rounded is employed. In addition, in order to further increase the electric heating area of the electric heating tube and reduce the processing cost of the forming roll, in the forming roll, a plurality of ring-shaped roll members having grooves formed on the outer peripheral surface are arranged in the direction of the rotation axis of the roll There are some which are configured by being inserted into the shaft in a layered manner.
[0003]
[Problems to be solved by the invention]
By the way, in the forming roll composed of a plurality of ring-shaped roll members, when the fin is formed, the workpiece enters between the overlapping surfaces, that is, the side surfaces of the roll members, which may impair the forming accuracy of the workpiece. Of course, there is a possibility that the crossed ridge line portion between the outer peripheral surface and the side surface of the roll member may be chipped due to the work entering between the roll members. Such a problem becomes more conspicuous when fins are formed on a copper strip that is easy to enter between roll members because the work is soft and rich in ductility.
[0004]
In addition, in the finned sheet material formed by the forming roll, when it is formed into a c-shaped cross section so as to be rounded in the width direction, a recess is formed on the surface of the tube, particularly at a stress concentration occurrence point depending on the fin shape. May occur, and further, the tube may be broken. And because these problems are also soft and rich in ductility, with the copper fins that tend to cause dents and tears on the tube surface due to the tensile force of the tube surface that occurs when forming a c-shaped cross section This becomes even more prominent when the sheet material is formed into a c-shaped cross section.
[0005]
The present invention has been made in consideration of such circumstances, and as described above, when the finned sheet material is formed by a forming roll composed of a plurality of roll members, the workpiece is soft and rich in ductility. Even if it is a copper strip or the like, it does not enter between the roll members, can prevent chipping that occurs at the intersection ridge line portion between the outer peripheral surface and the side surface of the roll member, and the cross-section c of the fin strip An object of the present invention is to provide a finned sheet material forming roll capable of suppressing the above-described dents and breakage of the finned sheet material due to stress concentration depending on the fin shape when forming into a letter shape.
[0006]
[Means for Solving the Problems]
In order to solve the above problems and achieve such an object, the present invention proposes the following means.
In the invention according to claim 1, fin forming grooves are formed on the outer peripheral surface of the roll body rotated about the axis, and the roll main body has a plurality of ring-shaped roll members in which the grooves are formed on the outer peripheral surface. Is a forming roll of a sheet material with fins that is configured by being inserted in a shaft while being overlapped in the axial direction, and at an intersecting ridge line portion between the outer peripheral surface of the roll body and the overlapping surface of the roll members. In the cross section orthogonal to the intersecting ridge line portion, a concave groove starting from one point on the outer peripheral surface of the roll and ending at one point on the overlapping surface is formed between the roll members constituting the roll body. It is characterized by being formed in an annular shape along the overlapping surface.
According to the finned sheet material forming roll according to the present invention, when the fin is formed on the sheet material, since the workpiece is positively entered into the groove portion formed on the overlapping surface, the roll member It is possible to prevent the workpiece from entering between the overlapping surfaces, that is, the side surfaces of each other, and it is possible to prevent the chipping generated at the intersecting ridge line portion between the outer peripheral surface and the side surface of the roll member.
[0007]
According to a second aspect of the present invention, in the forming roll of the finned sheet material according to the first aspect, the angle formed between the chamfered surface forming the concave groove and the overlapping surface is determined from the outer peripheral surface of the roll to the concave groove. It is formed so that it may become small as it goes to the bottom part.
According to the forming roll of the finned sheet material according to the present invention, the wall surface body extending in the longitudinal direction of the inverted V shape having a relatively small cross-sectional shape is formed in the longitudinal direction of the sheet material. Therefore, the attachment bottom part of the wall surface body can be formed wide in the width direction of the strip material over the entire length of the strip material. Accordingly, when the sheet material is formed into a c-shaped cross section, the bottom of the wall body functions as a reinforcing material against the tensile force generated on the surface of the sheet material, and the surface of the sheet material has a dent. It becomes possible to suppress tearing.
[0008]
According to a third aspect of the present invention, in the forming roll of the finned sheet material according to the first or second aspect, the depth of the groove is 100% to 100% of the depth of the groove for forming the fin in the sheet material. %.
According to the forming roll of the finned sheet material according to the present invention, the wall surface body having a height of 80% to 100% of the height of the fin is formed in the longitudinal direction of the sheet material. By this wall surface body, it functions as a dent of the strip material when the finned strip material is formed into a c-shaped cross section, and a reinforcing material against the tear, and this dent and tear can be suppressed. . Here, when the height of the wall surface body is less than 80% of the height of the fin, it is insufficient as a reinforcement for the dents and tears of the strip material, and when it exceeds 100%, the area in the pipe is reduced. By doing so, the allowable flow rate is reduced and the heat exchange efficiency is lowered, so the depth of the groove is set in the above range. And by implementing this invention and the invention which concerns on Claim 2 simultaneously, while being able to set appropriately the volume of the strip material required in order to form the said wall surface body, a strip material is formed in cross-section c-shape. It becomes possible to form a wall surface body that effectively functions as a reinforcing material when performing.
[0009]
According to a fourth aspect of the present invention, in the forming roll for the finned sheet material according to any one of the first to third aspects, the roll member is formed of a cemented carbide containing Cr as a binder. And
According to the forming roll of the sheet material with fins according to the present invention, the content of Co contained as a binder in the cemented carbide which constitutes the roll member can be reduced, and thereby the copper of the roll member with respect to copper It becomes possible to improve the welding resistance, and the durability can be improved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. The forming roll of the present embodiment includes a plurality of (five in the present embodiment) ring-shaped roll members 3... In which the roll body 1 is fitted and inserted into the central portion of the shaft 2 centering on the axis O. A plurality of grooves 3B as shown in a cross section in FIG. 3 are formed on the outer peripheral surface 3A of each roll member 3. Therefore, the forming roll having such a configuration has a predetermined interval between the outer peripheral surface 3A of the roll member 3 ... and the outer peripheral surface of another roll (not shown) having an axis parallel to the axis O. Both ends of the shaft 2 are supported by a molding device so as to face each other, and the molding device rotates the shaft 2 together with the roll members, and the other rolls rotate in the opposite direction to the molding roll. As a result, a long copper sheet material sandwiched between the outer peripheral surface 3A and the outer peripheral surface of another roll is fed in the longitudinal direction, and the groove 3B is formed on the surface of the sheet material. ... to form fins.
[0011]
Here, a roll member attachment portion 2A to which the roll members 3... Are attached and a flange portion 2C having a maximum outer diameter in the shaft 2 are formed in the center portion of the shaft 2 with respect to the axis O direction. A key groove 2B is formed in parallel to the axis O on the outer peripheral surface of the roll member mounting portion 2A, and the key 4 is fitted therein. An annular mounting member 5 having an L-shaped cross section is fitted on the outer periphery of the roll member mounting portion 2A so that a key groove 5A formed on the inner periphery thereof is fitted to the key 4 and is in the shape of an annular flat plate. The plurality of ring-shaped roll members 3 are fitted to the outer peripheral portion on one end side of the flange 5B of the mounting member 5 with the flange portion 5B forming a close contact with the flange portion 2C of the shaft 2. It is inserted so as to be overlapped in the direction of the axis O, and is attached so as to be sandwiched between the ring-shaped side plate 6 fitted on the outer periphery of the attachment member 5 on one end side and the flange portion 5B.
[0012]
The roll member 3 is formed in a ring shape of an annular flat plate having a rectangular shape whose cross section is flattened in the direction of the axis O by a material such as cemented carbide, and the outer diameter thereof is the flange 2C of the shaft 2 or the like. The outer diameter of the flange 5B of the mounting member 5 and the outer diameter of the side plate 6 is slightly larger, that is, the largest outer diameter of the forming roll, and the outer diameters of the roll members 3. Yes. Further, from the side plate 6 to the flange portion 5B of the mounting member 5, the bolt 7 is inserted in parallel to the axis O so as to pass through the roll members 3 ... and screwed into the flange portion 5B. The roll members 3... Are positioned at a predetermined rotational position around the axis O and are attached to the outer periphery of the attachment member 5, and the attachment member 5 can be rotated integrally with the shaft 2 via the key 4. The roll members 3... Can be integrally rotated with the shaft 2 while being positioned through the bolts 7 as described above.
[0013]
Further, the groove 3B formed on the outer peripheral surface 3A of the roll member 3 has a relatively small V-shaped cross section perpendicular to the groove 3B as shown in FIG. The bottom of the groove is formed in a concave arc shape with a small radius, and the intersecting ridge line portion with the outer peripheral surface 3A is formed in a convex arc shape with a small radius. Furthermore, a large number of grooves 3B for each roll member 3 are formed in a spiral shape that is twisted at an equal angle around the axis O at regular intervals in the circumferential direction, and adjacent to the direction of the axis O. In the roll members 3, 3, the circumferential intervals and twist angles of the grooves 3 </ b> B... Are equal to each other, but the twist directions are opposite to each other. In this state, the overlapping surface 3C of the adjacent roll members 3, 3 is set so that the position of the end of the groove 3B ... on the side surface of the roll members 3, 3 coincides with the circumferential direction. Has been. Here, in the fin formed by the roll member 3 configured as described above, a portion formed on the overlapping surface of the roll members 3 is a stress concentration portion.
[0014]
Then, in the overlapping surface 3C between the roll members 3 of the forming roll configured as described above, one point on the outer peripheral surface of the roll is a starting end 3D as shown in FIG. 4, and one point on the overlapping surface 3C. A groove 3F that is symmetrical with respect to the overlapping surface 3C and is formed in an annular shape along the overlapping surface 3C of the roll members 3 is defined as a terminal 3E. Further, the angle formed between the chamfered surface 3G forming the groove 3F and the overlapping surface 3C is smaller than the angle β formed on the bottom side of the groove 3F than the angle α on the roll outer peripheral surface side. A plurality of stepped grooves are formed so as to become smaller from the outer peripheral surface of the roll toward the bottom of the groove.
[0015]
When the fin is formed in the strip material by the concave groove 3F formed in this way, the workpiece is actively packed into the concave groove 3F by positively entering the concave groove 3F. Therefore, it becomes possible to prevent the workpiece from entering between the overlapping surfaces 3C of the roll members 3. Thereby, it becomes possible to suppress damage, such as a chip | tip which generate | occur | produces in the intersection ridgeline part of 3 A of outer peripheral surfaces of the roll member 3, and the overlapping surface 3C.
Here, the concave groove 3F is formed between the overlapping surfaces 3C of the roll members 3 by actively allowing the workpiece to enter the concave groove portion 3F when the fin is formed on the strip as described above. Therefore, even if the chamfered surface 3G has a stepped shape instead of a stepped shape, its function remains unchanged.
[0016]
Further, the concave groove 3F forms a relatively small inverted V-shaped wall surface having a narrow cross-sectional shape in the longitudinal direction of the strip material. Since the wall surface body is formed at the stress concentration portion, it is possible to suppress surface dents and tears that may occur when the strip material is formed in a c-shaped cross section. Moreover, by making the chamfered surface 3G into a convex curved surface shape as described above, it becomes possible to alleviate the stress concentration at the base of the wall surface and the strip material to be formed, and the function as a reinforcing material is more stable. It may be possible to achieve this. Here, the depth of the concave groove portion 3F is formed in the range of 80% to 100% of the depth of the groove 3B forming the fin. Accordingly, the height of the fin formed by the groove 3B is 80% to 100%. By setting the height of the wall body within this range, it is possible to give the necessary and sufficient strength against the dents and breaks of the strip material without reducing the heat exchange efficiency of the tube.
[0017]
In the present embodiment, the roll member 3 uses a cemented carbide containing Cr as a binder. Thereby, since it becomes possible to reduce content of Co contained as a binder in the cemented carbide which comprises the roll member 3, the welding resistance with respect to the copper of the roll member 3 can be improved, and it is durable. Improvements can be realized.
[0018]
【The invention's effect】
As described above, according to the first aspect of the present invention, the fin forming groove is formed on the outer peripheral surface of the roll body rotated about the axis, and the groove has the groove formed on the outer peripheral surface. A plurality of ring-shaped roll members that are formed by overlapping and inserting into the shaft in the axial direction, a finned sheet material forming roll, the outer peripheral surface of the roll body and between the roll members Since a concave groove for positively entering the workpiece is formed in the intersecting ridge line portion with the overlapping surface, it is possible to suppress the workpiece from entering the overlapping surface. Thereby, it becomes possible to suppress damage, such as a chip | tip which generate | occur | produces in the intersection ridgeline part of the outer peripheral surface of a roll member, and an overlapping surface.
[0019]
According to the invention according to claim 2, in the forming roll of the finned sheet material according to claim 1, the angle formed between the chamfered surface forming the concave groove and the overlapping surface is from the outer peripheral surface of the roll. Since it is formed so as to become smaller as it goes to the bottom of the concave groove, the wall surface body extending in the longitudinal direction of a relatively small inverted V shape with a narrow angle is formed in the longitudinal direction of the strip material when forming the fin. Will be formed. Thereby, the attachment bottom part of a wall surface body can be formed wide with respect to the width direction of a strip material over the full length of a plate-shaped material, and when this strip material is shape | molded in cross-section c-shape, this wall surface Since the bottom of the body functions as a reinforcing material against the tensile force generated on the surface of the strip material, it becomes possible to suppress dents and tears on the surface of the strip material.
[0020]
According to a third aspect of the present invention, in the forming roll for a finned sheet material according to the first or second aspect, the depth of the groove is 80 of the groove depth for forming the fin in the sheet material. Therefore, a wall body having a height of 80% to 100% of the fin height is formed in the longitudinal direction of the strip material. By this wall surface body, it functions as a dent of the strip material when the finned strip material is formed into a c-shaped cross section, and a reinforcing material against the tear, and this dent and tear can be suppressed. . Further, by simultaneously carrying out the present invention and the invention according to claim 2, it is possible to appropriately set the volume of the strip material required to form the wall surface body and to form the strip material in a c-shaped cross section. It is possible to form a wall body that effectively functions as a reinforcing material.
[0021]
According to the invention which concerns on Claim 4, in the shaping | molding roll of the sheet material with a fin in any one of Claim 1 to 3, the roll member uses the cemented carbide containing Cr as a binder. As a result, it becomes possible to reduce the content of Co contained as a binder in the cemented carbide, which constitutes the roll member, so that the welding resistance of the roll member to copper can be improved, and the durability can be improved. realizable.
[Brief description of the drawings]
FIG. 1 is a partially broken side view showing an embodiment of a forming roll of a finned sheet material of the present invention.
FIG. 2 is a plan view of the embodiment shown in FIG.
3 is a cross-sectional view of a concave groove 3B according to the embodiment shown in FIG.
4 is an enlarged side view of a groove 3F of the embodiment shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Roll main body 2 Shaft 3 Roll member 3A Roll member outer peripheral surface 3B Fin formation groove | channel 3C Overlapping surface 3F of roll members 3 Groove 3G Chamfering surface which forms the groove 3F The roll outer peripheral surface side which forms the groove 3F The angle β of the groove forming the concave groove 3F The angle of the bottom of this groove O The central axis of the roll body 1

Claims (4)

A groove for forming fins is formed on the outer peripheral surface of the roll body rotated around the axis, and the roll main body is formed by stacking a plurality of ring-shaped roll members having the grooves formed on the outer peripheral surface in the axial direction. It is a forming roll of a finned strip material that is configured by being inserted into a shaft, and the cross ridge line portion of the roll body outer peripheral surface and the overlapping surface of the roll members is in this cross ridge line portion. In the cross section orthogonal, a concave groove starting from one point on the outer peripheral surface of the roll and ending at one point on the overlapping surface is annular along the overlapping surface of the roll members constituting the roll body. A forming roll of a sheet material with fins, characterized in that it is formed. The forming roll of the finned sheet material according to claim 1, wherein an angle formed between the chamfered surface forming the concave groove and the overlapping surface becomes smaller from the outer peripheral surface of the roll toward the bottom of the concave groove. The forming roll of the sheet material with fin characterized by being formed like this. 3. The forming roll of a finned sheet material according to claim 1 or 2, wherein the depth of the groove is 80% to 100% of the depth of the groove for forming the fin in the sheet material. A forming roll of finned sheet material. The finned sheet material forming roll according to any one of claims 1 to 3, wherein the roll member is formed of a cemented carbide containing Cr. .

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