JP4888422B2 - Heat transfer plate manufacturing method and heat transfer plate - Google Patents

Description

  The present invention relates to a method for manufacturing a heat transfer plate used in, for example, a heat exchanger, a heating device, a cooling device, or the like.

A heat transfer plate arranged in contact with or close to an object to be heat exchanged, heated or cooled is provided with a heat medium pipe for circulating a heat medium such as high-temperature liquid or cooling water through a base member as a main body. It is formed by insertion.
As a method for manufacturing such a heat transfer plate, for example, a method described in Patent Document 1 is known. FIG. 10 is a view showing a heat transfer plate according to Patent Document 1, in which (a) is a perspective view and (b) is a cross-sectional view. A heat transfer plate 100 according to Patent Document 1 includes a base groove 102 having a lid groove 106 having a rectangular cross-sectional view opening on the surface, a concave groove 108 opening on the bottom surface of the lid groove 106, and heat inserted into the concave groove 108. A medium pipe 116 and a lid plate 110 fitted in the lid groove 106, and along the abutting surfaces of the side walls 105, 105 and the side surfaces 113, 114 of the lid plate 110 in the lid groove 106. By performing the friction stir welding, the plasticized regions W ₁ and W ₂ are formed.

JP 2004-314115 A

As shown in FIG. 10B, the heat transfer plate 100 has a gap 120 formed by the concave groove 108, the outer surface of the heat medium pipe 116 and the lower surface of the lid plate 110. If the gap portion 120 exists inside the plate 100, the heat radiated from the heat medium pipe 116 becomes difficult to be transmitted to the cover plate 110, and the heat exchange efficiency of the heat transfer plate 100 is reduced. It was.
From such a viewpoint, an object of the present invention is to provide a heat transfer plate manufacturing method with high heat exchange efficiency and a heat transfer plate with high heat exchange efficiency in a heat transfer plate manufactured by friction stir welding. .

  The manufacturing method of the heat transfer plate according to the present invention that solves such a problem includes an insertion step of inserting a heat medium pipe into a concave groove formed on the bottom surface of the lid groove that opens on the surface side of the base member, A lid groove closing step of disposing a lid plate in the lid groove, and a joining step of performing a friction stir welding by moving a rotary tool along a butting portion between a side wall of the lid groove and a side surface of the lid plate. In the joining step, a plastic fluidized material fluidized by frictional heat is caused to flow into a gap formed around the heat medium pipe.

  According to this manufacturing method, since the gap can be filled by injecting the plastic fluid material into the gap, heat is efficiently transferred between the heat medium pipe and the surrounding base member and the cover plate. can do. Thereby, a heat transfer plate with high heat exchange efficiency can be manufactured. For example, heat radiated from the heat medium pipe can be efficiently transmitted to the surrounding base member and the cover plate.

In the joining method according to the present invention, it is preferable that the tip of the rotary tool is inserted deeper than the bottom surface of the lid groove. Moreover, in the joining method, it is preferable that the closest distance between the tip of the rotary tool and the virtual vertical plane in contact with the heat medium pipe is 1 to 3 mm.
According to such a manufacturing method, the plastic fluidized material can be reliably introduced into the gap.

  According to this manufacturing method, the plastic fluidized material can be more surely flowed into the gap.

  The present invention also includes an upper lid groove closing step in which an upper lid plate is disposed in an upper lid groove formed wider than the lid groove on the surface side of the lid groove after the joining step, and a side wall of the upper lid groove And an upper lid joining step of performing friction stir welding by moving the rotary tool along the upper abutting portion between the upper lid plate and the side surface of the upper lid plate.

  According to this manufacturing method, on the surface side of the cover plate of the heat transfer plate according to claim 1, since the friction stir welding is further performed using the upper cover plate wider than the cover plate, the heat medium is used at a deeper position. Tubes can be placed.

  Further, the present invention provides a base member having a lid groove that opens to the front surface side, a concave groove that opens to the bottom surface of the lid groove, a heat medium pipe inserted in the concave groove, and the lid groove. A gap plate formed around the heat medium pipe by performing friction stir welding along the abutting portion between the side wall of the lid groove and the side surface of the lid plate. The plastic fluidized material fluidized by frictional heat is introduced.

  According to such a configuration, the plastic fluidized material is caused to flow into the gap and the gap is filled, so that the heat exchange efficiency of the heat transfer plate can be increased.

  In addition, the present invention has a base member provided with an upper lid groove formed wider than the lid groove on the surface side of the lid groove, and an upper lid plate disposed in the upper lid groove, It is preferable that friction stir welding is performed by moving the rotary tool along the upper abutting portion between the side wall of the upper lid groove and the side surface of the upper lid plate.

  According to this configuration, on the surface side of the heat transfer plate according to claim 5, the friction stir welding is further performed using the upper lid plate wider than the lid plate, so that the heat medium pipe is disposed at a deeper position. be able to.

  According to the heat transfer plate manufacturing method of the present invention, a heat transfer plate with high heat exchange efficiency can be manufactured. Moreover, according to the heat exchanger plate which concerns on this invention, heat exchange efficiency can be improved.

[First embodiment]
The best embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a heat transfer plate according to the first embodiment. FIG. 2 is an exploded cross-sectional view showing the heat transfer plate according to the first embodiment. FIG. 3 is a cross-sectional view showing the heat transfer plate according to the first embodiment.

As shown in FIGS. 1 to 3, the heat transfer plate 1 according to the first embodiment includes a thick plate-shaped base member 2 having a front surface 3 and a back surface 4, and a lid groove 6 opened on the front surface 3 of the base member 2. And the plasticizing regions W ₁ and W ₂ formed by friction stir welding, mainly including a cover plate 10 disposed on the bottom surface of the cover groove 6 and a heat medium pipe 16 inserted into the concave groove 8 opened in the bottom surface of the cover groove 6. Are integrally formed. Further, as shown in FIGS. 2 and 3, the heat transfer plate 1 has a plastic fluidized material in a gap P formed by the concave groove 8, the outer surface of the heat medium pipe 16 and the lower surface 12 of the lid plate 10. Q is flowing in.

  As shown in FIG. 2, the base member 2 has a role of transmitting heat of the heat medium flowing through the heat medium pipe 16 to the outside, or a role of transferring external heat to the heat medium flowing through the heat medium pipe 16. To fulfill. A cover groove 6 is formed in the surface 3 of the base member 2, and a groove 8 narrower than the cover groove 6 is formed in the center of the bottom surface of the cover groove 6. The lid groove 6 is a portion where the lid plate 10 is disposed, and is continuously formed in the longitudinal direction. The lid groove 6 has a rectangular shape in cross section, and includes side walls 5 a and 5 b that rise vertically from the bottom surface of the lid groove 6. The concave groove 8 is a portion into which the heat medium pipe 16 is inserted, and is continuously formed in the longitudinal direction. The concave groove 8 is a U-shaped groove with an upper opening, and a semicircular curved surface 7 is formed at the lower end. As shown in FIG. 3, the width of the opening portion of the concave groove 8 is formed with a width A substantially equal to the diameter of the curved surface 7. Further, it is assumed that the lid groove 6 is formed with a groove width E and the groove 8 is formed with a depth C. The base member 2 is made of, for example, an aluminum alloy (JIS: A6061).

2 and 3, the lid plate 10 is made of the same aluminum alloy as described above, and has an upper surface 11, a lower surface 12, a side surface 13a, and a side surface that form a rectangular section substantially the same as the section of the lid groove 6 of the base member 2. 13b. The lid plate 10 is formed with a lid thickness F.
The lid plate 10 is disposed in the lid groove 6 as shown in FIG. The side surfaces 13a and 13b of the lid plate 10 are in surface contact with the side walls 5a and 5b of the lid groove 6 or face each other with a fine gap. Here, below the abutting faces of the side surface 13a and the side walls 5a, and butt portion _{V 1.} Moreover, following the abutting faces of the side face 13b and the sidewall 5b, the butt portion _{V 2.}

As shown in FIG. 2, the heat medium pipe 16 is a cylindrical pipe having a hollow portion 18 having a circular cross section. Here, it is assumed that the heat medium pipe 16 is formed with an outer diameter B and a tube thickness D.
The outer diameter B of the heat medium pipe 16 is formed substantially equal to the width A of the concave groove 8, and as shown in FIG. 3, the lower half of the heat medium pipe 16 and the curved surface 7 of the concave groove 8 Makes surface contact. The upper end of the heat medium pipe 16 is in line contact with the lower surface 12 of the cover plate 10 at the contact portion 16a. The heat medium pipe 16 is a member that circulates a heat medium such as a high-temperature liquid or a high-temperature gas in the hollow portion 18 to transmit heat to the base member 2 and the cover plate 10, or a cooling water or a cooling member in the hollow portion 18. This is a member that circulates a heat medium such as gas and transfers heat from the base member 2 and the cover plate 10. Moreover, you may utilize as a member which transmits the heat which generate | occur | produces from a heater to the base member 2 and the cover board 10, for example through a hollow part 18 of the pipe | tube 16 for heat-medium.

  In the first embodiment, for example, the heat medium pipe 16 has an outer diameter B of 12.0 mm and a pipe thickness D of 1.0 mm. In the first embodiment, the heat medium pipe 16 is circular in cross section, but may be square in cross section. Moreover, although the copper pipe was used for the heat medium pipe 16 in the first embodiment, a pipe made of another material may be used.

  In the first embodiment, the concave groove 8 and the lower half of the heat medium pipe 16 are brought into surface contact, and the upper end of the heat medium pipe 16 and the lower surface 12 of the cover plate 10 are brought into line contact. However, the present invention is not limited to this. For example, the depth C and the outer diameter B of the concave groove 8 may be formed in a range of B <C <1.2B. Further, the width A of the concave groove 8 and the outer diameter B of the heat medium pipe 16 may be formed in a range of B <A <1.1B.

As shown in FIGS. 2 and 3, the gap P is a space surrounded by the heat medium pipe 16, the groove 8, and the lower surface 12 of the lid plate 10. In the first embodiment, since the upper end of the heat medium pipe 16 and the lower surface 12 of the cover plate 10 are in contact with each other at the contact portion 16a, the two gap portions P ₁ and P ₂ are separated by the contact portion 16a. Is formed.
In addition, the space | gap part P is suitably determined based on the shape of the ditch | groove 8, the heat medium pipe | tube 16, etc., and is not limited to an above described form.

As shown in FIGS. 2 and 3, the plasticized regions W ₁ and W ₂ are formed such that a part of the base member 2 and the cover plate 10 is plastically flowed when friction stir welding is performed on the butted portions V ₁ and V _2. It is an integrated area. Note that the plasticizing region includes both a state in which the rotating tool is heated by frictional heat and is actually plasticized, and a state in which the rotating tool passes and returns to room temperature. The plasticized regions W ₁ and W ₂ are indicated by hatched portions in FIG.
That is, along the butt portion V _1, V _2, when subjected to friction stir welding using a rotary tool to be described later, the metallic material of the base member 2 and the cover plate 10 according to the periphery of the butted portion V _1, V ₂ are, Fluidized by frictional heat of rotating tool. At this time, the fluidized metal material (plastic fluid Q) flows into the gaps P ₁ and P ₂ to fill the gaps and hardens to join the base member 2 and the lid plate 10.

  When performing friction stir welding, the plastic fluidized material Q is preferably allowed to flow into the gap P by setting the pushing amount and insertion position of the rotary tool based on the shape and size of the gap P. be able to. That is, it is preferable that the plastic fluid material Q flows into the gap portion P without gaps by bringing the rotary tool close to the heat medium pipe 16 so as not to collapse. The pushing amount of the rotary tool will be described later.

According to the heat transfer plate 1 as described above, the base member 2 and the cover plate 10 are plasticized and fluidized by friction stir welding in the plasticizing regions W ₁ and W ₂ . The plastic fluidized material Q is introduced into the gap P. Thereby, while joining the base member 2 and the cover board 10, the space | gap part P can be filled up. Further, during the friction stir welding, the heat medium tube 16 is pressed by the bottom surface of the tool body (shoulder) of the rotary tool described later, and therefore can be brought into surface contact with the curved surface 7 of the groove 8. Thereby, the heat from the heat medium circulating through the heat medium pipe 16 can be efficiently transmitted to the base member 2 and the cover plate 10, or the heat of the base member 2 and the cover plate 10 can be efficiently transmitted to the heat medium.

  Next, the manufacturing method of the heat exchanger plate 1 is demonstrated using FIG. FIG. 4 is a cross-sectional view showing a method of manufacturing a heat transfer plate according to the first embodiment, wherein (a) is a view showing an end mill process and a cutting process, and (b) is a pipe insertion process. (C) is a figure showing a lid groove closing process, (d) is a figure showing a joining process, and (e) is a completed figure.

The heat transfer plate manufacturing method according to the first embodiment includes an end mill process and a cutting process for forming the base member 2, an insertion process for inserting the heat medium pipe 16 into the concave groove 8 formed in the base member 2, and This includes a lid groove closing step of disposing the lid plate 10 in the lid groove 6 and a joining step of moving the rotary tool 20 along the butted portions V ₁ and V ₂ to perform friction stir welding.

(End mill process and cutting process)
First, as shown in FIG. 4A, the lid groove 6 is formed in the thick plate member by a known end mill process. Then, a concave groove 8 having a semicircular cross section is formed on the bottom surface of the lid groove 6 by cutting or the like. Thereby, the base member 2 provided with the cover groove 6 and the concave groove 8 opened in the bottom face of the cover groove 6 is formed. The concave groove 8 is provided with a curved surface 7 having a semicircular cross section in the lower half, and is opened upward with a certain width from the upper end of the curved surface 7.
Although the base member 2 is formed by end milling and cutting in the first embodiment, an extruded shape of an aluminum alloy may be used.

(Insertion process)
Next, as shown in FIG. 4B, the heat medium pipe 16 is inserted into the groove 8. The lower half of the heat medium pipe 16 is in surface contact with the curved surface 7 that forms the lower half of the groove 8.

(Cover groove closing process)
Next, as shown in FIG. 4C, a lid plate 10 made of an aluminum alloy is disposed in the lid groove 6 of the base member 2. At this time, the lower surface 12 of the cover plate 10 and the upper end of the heat medium pipe 16 are in line contact, and the upper surface 11 of the cover plate 10 is flush with the surface 3 of the base member 2. Moreover, butted portions V ₁ and V ₂ are formed by the side walls 5 a and 5 b (see FIG. 4A) of the lid groove 6 and the side surfaces 13 a and 13 b of the lid plate 10.

(Joining process)
Next, as shown in FIG. 4D, friction stir welding is performed along the butted portions V ₁ and V ₂ . Friction stir welding is performed using a known rotary tool 20.
The rotary tool 20 is made of, for example, tool steel and includes a cylindrical tool body 22 and a pin 26 that hangs down from the center of the bottom surface 24 on a concentric axis. The pin 26 is formed in a tapered shape that becomes narrower toward the tip. A plurality of small grooves (not shown) and screw grooves along the radial direction may be formed on the peripheral surface of the pin 26 along the axial direction.

  Here, FIG. 5 is a schematic cross-sectional view showing the positional relationship between the heat transfer plate and the rotary tool according to the first embodiment. For example, the rotary tool 20 has a tool body 22 with a diameter of 6 to 22 mm, a pin 26 with a length of 3 to 10 mm, and a pin 26 with a tip with a diameter of 2 to 8 mm. The rotational speed of the rotary tool 20 is 50 to 1500 rpm, the feed rate is 0.05 to 2 m / min, and the pushing force applied in the axial direction of the rotary tool 20 is 1 kN to 20 kN. Here, as shown in FIG. 5, the length of the pin 26 is the pin length G, and when the rotary tool 20 is pushed in, the distance from the surface 3 of the base member 2 to the bottom surface 24 of the rotary tool 20 ( The push amount) is defined as a push amount H. The closest distance between the virtual vertical plane of the heat medium pipe 16 and the tip of the pin 26 is defined as an offset amount I. Note that the shape and the like of the rotary tool 20 described above are merely examples, and are not limited.

In the bonding step, in a state of being constrained by a jig not shown the base member 2 and the cover plate 10, pushing the rotating tool 20 rotating at a high speed to the respective butt portions V _1, V _2, along the butt portion V _1, V ₂ moves Let By the pin 26 rotating at high speed, the surrounding base member 2 and the aluminum alloy material of the cover plate 10 are heated and fluidized by frictional heat. Then, the fluidized material (plastic fluid material Q) flows into the gap P. That is, the fluidized plastic fluid material Q is pushed out and flows into the gap P by the pushing force of the bottom surface 24 of the tool body 22 of the rotary tool 20.

Here, the pushing amount H (pushing length) of the rotary tool 20 is such that the metal volume of the cover plate 10 from which the tool main body 22 is pushed away is the volume of one void portion P around the heat medium pipe 16 and the plasticizing region. It is preferable to set so as to be equivalent to the sum of the burrs generated on both sides of W ₁ and W _{2 in} the width direction.
Note that, after the joining step, the burrs generated on both sides in the width direction of the plasticized regions W ₁ and W ₂ may be removed by cutting or face-cutting to form a smooth surface.

According to the heat transfer plate manufacturing method described above, the plasticized regions W ₁ and W ₂ are formed along the butted portions V ₁ and V ₂ , and the heat medium pipe 16 is formed by the base member 2 and the cover plate 10. Is sealed. Furthermore, since the plastic fluidized material Q flows into the gap P and fills the gap P, a heat transfer plate with high heat exchange efficiency can be formed. The thickness of the cover plate 10 and the amount of pressing of the rotary tool 20 will be described in detail in the embodiments.

FIG. 6 is a plan view showing a heat transfer unit using the heat transfer plate according to the first embodiment.
As shown in FIG. 6, for example, the heat transfer plate 1 is used by connecting a plurality of heat transfer plates 1 to form a heat transfer unit 90. The heat transfer unit 90 includes a plurality of heat transfer plates 1 arranged in parallel in the short direction of the base member 2, and the heat medium pipes 16 protruding from both ends in the longitudinal direction of the base members 2 are connected in a U shape in plan view. It is formed by connecting with a pipe 91. According to such a heat transfer unit 90, since one heat medium pipe 96 is formed, the heat medium is circulated through the heat medium pipe 96, so that the base member 2 and the cover plate 10 can be connected. An object (not shown) in contact with or in close proximity can be quickly cooled or heated.

  In addition, the connection method of the heat exchanger plate 1 is an illustration to the last, and you may form a heat transfer unit with another connection method. Further, in the heat transfer unit 90, the connection pipe 91 is exposed to the outside of the heat transfer plate 1, but the heat medium pipe 16 is formed in an S shape so that the heat medium pipe 16 is the heat transfer plate 1. You may form so that it may fit inside.

[Second Embodiment]
Next, the heat transfer plate according to the second embodiment will be described. FIG. 7 is an exploded sectional view showing a heat transfer plate according to the second embodiment. FIG. 8 is a cross-sectional view showing a heat transfer plate according to the second embodiment.
A heat transfer plate 31 according to the second embodiment shown in FIG. 8 includes a structure substantially equivalent to the above-described heat transfer plate 1, and an upper lid plate 40 is further arranged on the surface side of the lid plate 10 to friction stir. It differs from 1st embodiment by the point which gave and joined.
In addition, the structure equivalent to the above-described heat transfer plate 1 is also referred to as a lower lid portion M below. Moreover, about the member which overlaps with the heat exchanger plate 1 which concerns on 1st embodiment, an equivalent code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

The heat transfer plate 31 includes a base member 32, a heat medium pipe 16 inserted into the concave groove 8, a lid plate 10, and an upper lid plate 40 disposed on the surface side of the lid plate 10, and is plastic. The integrated regions W _{1 to} W ₄ are integrated by friction stir welding.
As shown in FIGS. 7 and 8, the base member 32 is made of, for example, an aluminum alloy, and has a top cover groove 36 formed in the longitudinal direction on the surface 33 of the base member 32 and a bottom surface 35 c of the top cover groove 36. It has the cover groove | channel 6 formed continuously over the direction, and the ditch | groove 8 formed in the bottom face of the cover groove | channel 6 over the longitudinal direction. The upper lid groove 36 has a rectangular shape in a sectional view and includes side walls 35a and 35b that rise vertically from the bottom surface 35c. The width of the upper lid groove 36 is formed larger than the width of the lid groove 6.

As shown in FIG. 7, the heat medium pipe 16 is inserted into the groove 8 formed in the lower part of the base member 32, is closed by the cover plate 10, and is plasticized region W ₁ , by friction stir welding. Joined with W ₂ . That is, the lower lid portion M formed inside the base member 32 is formed substantially equivalent to the heat transfer plate 1 according to the first embodiment.

Note that a step (groove) or a burr may be generated on the bottom surface 35c of the upper lid groove 36 due to the friction stir welding. Therefore, for example, it is preferable that the bottom surface 35c of the upper cover groove 36 is chamfered and formed smoothly with reference to the surfaces of the plasticized regions W ₁ and W ₂ . Thereby, the lower surface 42 of the upper cover board 40 and the bottom face of the upper cover groove | channel 36 after chamfering can be arrange | positioned without gap.

As shown in FIGS. 7 and 8, the upper lid plate 40 is made of, for example, an aluminum alloy, has a rectangular cross section substantially the same as the cross section of the upper lid groove 36, and has side surfaces 43 a and side surfaces 43 b formed vertically from the lower surface 42. And have. The upper lid plate 40 is fitted in the upper lid groove 36. That is, the side surfaces 43 a and 43 b of the upper lid plate 40 are in surface contact with the side walls 35 a and 35 b of the upper lid groove 36 or are arranged with a fine gap. Here, below the abutting faces of the side surface 43a and the side wall 35a, and the upper butt portions _{V 3.} Moreover, following the abutting faces of the side face 43b and the sidewall 35b, and upper butt portion _{V 4.} The upper butt portions V ₃ and V ₄ are integrated in the plasticized regions W ₃ and W ₄ by friction stir welding.

The manufacturing method of the heat transfer plate 31 includes a chamfering step of chamfering the bottom surface 35c of the upper cover groove 36 after forming the lower lid portion M on the lower portion of the base member 32 by a manufacturing method equivalent to the heat transfer plate 1. It includes an upper lid groove closing step in which the upper lid plate 40 is disposed and an upper lid joining step in which friction stir welding is performed along the upper butt portions V ₃ and V ₄ .

  The chamfering step is a step of smoothing the bottom surface 35c by cutting and removing steps (grooves) and burrs formed on the bottom surface 35c of the upper lid groove 36.

  In the upper lid groove closing step, the upper lid plate 40 is disposed on the bottom surface of the upper lid groove 36 after the chamfering step. By performing the chamfering step, the lower surface 42 of the upper lid plate 40 and the bottom surface of the upper lid groove 36 can be arranged without a gap.

In the upper lid joining step, the rotary tool 20 is moved along the upper butting portions V ₃ and V ₄ to perform friction stir welding. What is necessary is just to set suitably the embedding depth of the rotary tool 20 in an upper cover joining process in consideration of the length G of the pin 26 (refer FIG. 5) and the thickness F of the upper cover board 40. FIG.

  According to the heat transfer plate 31 according to the embodiment, the upper cover plate 40 is further disposed above the lower cover portion M, and the heat medium pipe 16 is disposed at a deeper position by performing friction stir welding. Can do.

  The embodiment according to the present invention has been described above. However, the present invention is not limited to this, and can be appropriately changed without departing from the spirit of the present invention. For example, in the above-described embodiment, the cover plate 10 and the upper cover plate 40 are disposed on the upper surface side of the base members 2 and 32, but may be disposed on the lower surface side.

  Here, Example 1 and Example 2 of the heat transfer plate of the present invention will be described. 2 and 4 are appropriately referred to for the dimensions of the elements constituting the heat transfer plate. In Example 1 and Example 2, as shown in Table 1, the outer diameter B of the heat medium pipe (also referred to as a copper pipe), the thickness D of the copper pipe, the groove width E of the lid plate, and the lid thickness of the lid plate Regarding F, after setting two kinds of preconditions, a test was performed using the pin length G, the push-in amount H, and the offset amount I of the rotary tool as parameters, and the joining state of each condition was visually determined. The number of rotations of the pin during friction stir welding was 700 rpm, and the joining speed (feeding speed) was 300 mm / min.

  In Example 1, as shown in Table 1, the preconditions are the outer diameter B of the copper tube: 12.7 mm, the thickness D of the copper tube: 1.0 mm, the groove width E of the cover plate: 13.0 mm, the cover plate The lid thickness F was 6.0 mm, and the test was conducted using the pin length G, the push-in amount H, and the offset amount I as parameters, as shown in Table 2. Each test condition was classified as condition 1 to condition 5 according to the pin length G and push-in amount H, and further classified as condition a to condition d according to the offset amount I.

  The “joining state” of the items shown in Table 2 is a state in which the heat transfer plate is viewed in cross section, and visually observes and observes the clearance around the heat medium pipe (gap part P) and the collapse state of the heat medium pipe, A state where the gap is very small and the pipe is not crushed is indicated as “◎”, a state where there is a slight gap but the pipe is not crushed is indicated as “◯”, and a state where there is no gap but the pipe is crushed is indicated as “△”. Was marked “x”.

As is clear from Table 2, in conditions 3a to 3c, condition 4c, condition 4d, condition 5c and condition 5d, the plastic fluid material Q suitably flows into the gap P, and a heat transfer plate with high heat exchange efficiency is obtained. It was confirmed that it was formed.
On the other hand, in conditions 1 and 2, it was confirmed that the bonding state was poor. That is, since the distance from the heat medium pipe 16 to the tip of the pin 26 is long, the plastic fluid material Q does not flow into the gap P, or the plastic fluid material Q has a small inflow amount, so that there are many gaps. Oops.
On the other hand, in conditions 4a, 4b, 5a and 5b, it was confirmed that the tube was crushed because the distance between the heat medium tube and the pin was too short.

  In Example 2, as shown in Table 1, the preconditions are the outer diameter B of the copper tube: 10.0 mm, the thickness D of the copper tube: 1.0 mm, the groove width E of the lid plate: 10.3 mm, the lid plate The lid thickness F was 6.0 mm, and the test was conducted using the pin length G, the pushing amount H, and the offset amount I as parameters, as shown in Table 3. Each condition of the test was set as condition 6 and condition 7 according to the pin length G and the pushing amount H, and further as condition a to condition h according to the offset amount I.

  As is clear from Table 3, it was confirmed that the bonding state was good in the conditions 6b and 7b to 7f. Further, when the condition 6 is compared with the condition 7, the condition 6 has a good offset state with an offset amount H of 1.0 mm, whereas the condition 7 has a wide offset amount H of 0.5 to 2.5 mm. It was confirmed that the joining state was good in the range. That is, under the preconditions of Example 2, it was confirmed that the pin length G and the push-in amount H in Condition 7 can be applied in a wider range.

Here, FIG. 9 is a graph showing the correlation between the tip position of the pin, the lid thickness, and the length of the copper tube outer diameter. In the graph, the horizontal axis indicates the depth position of the tip of the pin (hereinafter referred to as depth Y), and the vertical axis indicates the lid thickness + the outer diameter of the copper tube / 4 (hereinafter referred to as length Z). Is shown.
That is, depth Y = pin length G (mm) + indentation amount H (mm), and length Z = lid thickness F (mm) + copper tube outer diameter B / 4 (mm). . Plot point _{X 1} is a point showing the condition 3 of Example 1 (see Table 2, the pin length G = 8.0 mm, the pressing amount H = 1.0mm). Also, the plot point _{X 2} is a point showing the condition 7 of Example 2 (see Table 3, length of the pin G = 8.0, pushing amount H = 1.0mm). Further, the outer diameter B and the lid thickness F of the copper tube at other plot points are as shown in the legend of FIG.

That is, considering that Condition 3 of Example 1 and Condition 7 of Example 2 were good, the correlation between depth Y and length Z is a bonded state when 0.8Y <Z <1.1Y. Was confirmed to be good.
That is, as shown in the plot point X ₃ and plotted point X _4, by setting the depth Y for example shallow, when the Y = 7 mm, the thin cover thickness along therewith and (FutaAtsu F = 4 mm It can be inferred that the bonding state is suitable.

It is the perspective view which showed the heat exchanger plate which concerns on 1st embodiment. It is an exploded sectional view showing the heat exchanger plate concerning a first embodiment. It is sectional drawing which showed the heat exchanger plate which concerns on 1st embodiment. It is sectional drawing which showed the manufacturing method of the heat exchanger plate which concerns on 1st embodiment, (a) is the figure which showed the end mill process and the cutting process, (b) is the insertion process which inserted the pipe. (C) is the figure which showed the obstruction | occlusion process, (d) is the figure which showed the joining process, (e) is the completion figure. It is the schematic cross section which showed the positional relationship of the heat exchanger plate and rotary tool which concern on 1st embodiment. It is the top view which showed the heat-transfer unit using the heat-transfer board which concerns on 1st embodiment. It is the exploded sectional view showing the heat exchanger plate concerning a second embodiment. It is sectional drawing which showed the heat exchanger plate which concerns on 2nd embodiment. It is the graph which showed the correlation with the front-end | tip position of a pin, the cover thickness, and the outer diameter of a copper tube. It is the figure which showed the conventional heat exchanger plate, (a) is a perspective view, (b) is sectional drawing.

DESCRIPTION OF SYMBOLS 1 Heat transfer plate 2 Base member 5a Side surface 5b Side surface 6 Lid groove 8 Recessed groove 10 Lid plate 13a Side wall 13b Side wall 20 Rotating tool 31 Heat transfer plate 36 Lid groove 35a Side wall 35b Side wall 40 Upper lid plate 43a Side surface 43b Side surface P Cavity Q Plastic flow material V Butt part W Plasticization region

Claims (6)

An insertion step of inserting the heat medium pipe into the concave groove formed on the bottom surface of the lid groove opening on the surface side of the base member;
A lid groove closing step of disposing a lid plate in the lid groove;
A joining step of performing friction stir welding by moving the rotary tool along the abutting portion between the side wall of the lid groove and the side surface of the lid plate,
In the joining step, a plastic fluidized material fluidized by frictional heat is caused to flow into a gap formed around the heat medium pipe.   2. The method for manufacturing a heat transfer plate according to claim 1, wherein in the joining step, a tip of the rotary tool is inserted deeper than a bottom surface of the lid groove.   3. The transmission according to claim 1, wherein, in the joining step, a closest distance between a tip of the rotating tool and a virtual vertical surface that contacts the heat medium pipe is 1 to 3 mm. Manufacturing method of hot plate. After the joining step,
An upper lid groove closing step of disposing an upper lid plate on the upper lid groove formed wider than the lid groove on the surface side of the lid groove;
An upper lid joining step of performing friction stir welding by moving a rotary tool along an upper abutting portion between a side wall of the upper lid groove and a side surface of the upper lid plate;
The manufacturing method of the heat exchanger plate as described in any one of Claims 1 thru | or 3 characterized by the above-mentioned. A base member having a lid groove opening on the front surface side and a concave groove opening on the bottom surface of the lid groove;
A heat medium pipe inserted into the concave groove;
A lid plate disposed in the lid groove,
By applying friction stir welding along the abutting portion between the side wall of the lid groove and the side surface of the lid plate, the plastic flow fluidized by frictional heat is formed in the gap formed around the heat medium pipe A heat transfer plate in which material is introduced. A base member provided with an upper lid groove formed wider than the lid groove on the surface side of the lid groove, and an upper lid plate disposed in the upper lid groove;
The heat transfer plate according to claim 5, wherein friction stir welding is performed by moving a rotary tool along an upper abutting portion between a side wall of the upper lid groove and a side surface of the upper lid plate.

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