JPH02251366A - Manufacture using constraining jig - Google Patents

Abstract

PURPOSE:To prevent the member from being deformed by placing a spacer between the member and a constraining jig at the time of brazing plural members by using the constraining jig, and absorbing a difference of coefficients of thermal expansion of the constraining jig and the member at the time of brazing. CONSTITUTION:A holding plate 22 and 23 are placed in the upper part and the lower part of a member 14, a metallic spacer 18 made of a material which is half melted or melted at a melting temperature of a brazing filler metal is interposed between the member 14 and a constraining jig 16, and the member 14 is tightened with a nut 24 and a bolt 16 of the constraining jig 16. When the member 14 is heated in a state that it remains tightened by the constraining jig 16, the member 14 is brought to thermal expansion but since the spacer 18 is half melted or melted, the tightening pressure is not varied so much. In such a way, deformation and damage of the member can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of manufacturing various types of equipment by joining each member using a restraint jig.

[Prior Art] Conventionally, for example, when manufacturing an aluminum alloy heat exchanger by brazing (as shown in Table 5), first, an aluminum alloy heat exchange tube P1 is bent into a meandering shape,
Next 1: A corrugated fin P2 clad with brazing material is placed in the gap between the bent and multistage heat exchange tubes P1 to temporarily assemble the heat exchanger. Then, the heat exchanger is pressed and fixed from above and below using a restraining jig P3 made of heat-resistant stainless steel or the like. Next, in this fixed state, heat the heat exchanger to a predetermined temperature to melt the brazing material, and heat exchange tube P1
[Problems to be Solved by the Invention] However, with such a manufacturing method, the heat exchanger could not necessarily be suitably manufactured for the following reasons. When heated to braze P1 and corrugated fins P2, the aluminum alloy heat exchanger thermally expands. On the other hand, the heat-resistant restraining jig P3 also thermally expands due to its heating, but since the heat exchanger and the restraining jig P3 have different coefficients of thermal expansion, the restraining jig P3 is heated during the heating process.
3, the force for tightening the heat exchanger is different, i.e.
Normally, the coefficient of thermal expansion of the heat exchanger is larger than that of the restraint jig P3, so when temporarily assembled during the heating process, a load greater than the force is applied to the heat exchanger. As a result, the corrugated fins P2 buckled or yielded and deformed, making it impossible to manufacture a heat exchanger with good heat transfer performance. If the attachment force is kept weak, a problem will arise in which the corrugated fins P2 will come off from the heat exchange tubes P1 when the temporarily assembled heat exchanger is withdrawn from the heating process. Furthermore, if the material of the restraint jig P3 is changed to, for example, an aluminum alloy that has the same coefficient of thermal expansion as the material of the heat exchanger, deformation of the corrugated fin P2 during heating can be prevented, but this time the durability at high temperatures will be affected. A problem arises in that it cannot be used over and over again because it lacks functionality. Therefore, none of these measures can solve the above-mentioned problems, and the manufacturing method using the restraining jig of the present invention (preventing deformation and damage of members caused by differences in thermal expansion coefficients during brazing) The purpose is to

[Means for Solving the Problems] That is, a manufacturing method using the restraint jig of the present invention to solve the above problems (a plurality of members are press-fixed using a restraint jig, and a plurality of members are fixed in the vicinity of the members). In a manufacturing method in which the members are joined by placing a brazing material and heating and melting the brazing material, when fixing the plurality of members (Table 1: Between the member and the restraining jig, at least The gist is to arrange a spacer that semi-melts or melts at a temperature that heats and melts the pre-distributed brazing filler metal.

[Function] In the manufacturing method using the restraint jig of the present invention, a plurality of member color restraint jigs are used to temporarily assemble the members by pressing and fixing them, and a brazing material is placed near the members. When fixing the spacer, a spacer that is semi-molten or molten at least at a temperature at which the brazing material melts is placed between the temporarily assembled member and the restraint jig.

Then, when the members are fixed using a restraining jig through this spacer and the brazing material is heated and melted to perform brazing between the members, the spacer becomes semi-molten or melted, and the restraining jig and the member Prevents deformation of parts by absorbing differences in thermal expansion.

Here, the present invention is applicable to Table 1: Various devices manufactured by brazing, such as heat exchangers, etc. The plurality of members are members of various devices, such as heat exchange tubes and corrugated fins of a heat exchanger.

Also, placing a brazing filler metal near a component does not only mean arranging a brazing filler metal separate from each component, but also refers to a component whose surface is clad with brazing filler metal in advance, such as a plating sheet. ing.

Various materials that can be brazed, such as aluminum or aluminum alloy, can be used as the material for the member. In addition, as a material for the restraint jig, for example, stainless steel, which has high heat resistance, can be used.

Further 1: When heating and melting the brazing filler metal, various materials that are semi-molten or molten can be used as spacers, such as pure gold alloys such as Pb, Zn, Cd, and Sn, or Pb-S. n gold color Pb-Zn combination 1s
n-Zn 1cd-20 1AQ-20 1AQ-Sn
Metal spacers made of various alloys such as alloys can be used. Furthermore, in addition to metals, Blaztic and the like can also be used.

[Example] Next, an example of the present invention will be described based on FIGS. 1 to 4.

(Heat exchange tube bending process)...I As shown in Fig. 2, as the heat exchange tube 1, JIS-30
Width 22 mm and height 5 mm made of 03 aluminum alloy
Using a nine-hole extruded porous tube, the heat exchange tube 1 is meandered to form multiple stages. Then, the refrigerant inlet pipe 2 and the refrigerant outlet pipe 4 are joined to both ends of the heat exchange pipe 1 by argon welding or the like.

(Fin installation process)...11 Next, as shown in FIG. A corrugated fin 8 is placed. On the surface of the core material made of aluminum alloy of this corrugated fin 81 size JIS-3003, J I 5-BA
J I 5-BA12 clad with 4343 brazing metal
It is formed from PC brazing sheets.

Further 1: When the full gate fin 8 and the top plate 10 are arranged at the top of the meandering heat exchange tube 1, 1:.

Similarly, a corrugated fin 8 and a bottom plate 12 are arranged at the lowest part of the heat exchange tube 1 to constitute a heat exchanger core 14.

(Temporary assembly process)...111 Then, as shown in FIG. 4, a pair of heat-resistant stainless steel restraining jigs 16 formed into a substantially U-shape are used to secure metal spacers 18. The heat exchanger core 14 is temporarily assembled by tightening the tray 20 and the holding plates 22, 23 with a pressure of several tens of gf/cm2.

That is, as shown in FIG. 1, a bolt 26 is screwed into a nut 24 that is connected to a 1mm restraint jig 16, and a metal spacer 18° is placed on a tray 20 in which the metal spacer 18 is placed. and arrange the upper presser plate 22,
On the other hand, a lower presser plate 23 is placed below the restraint jig 16 with a lower spacer 28 interposed therebetween. Then, by tightening the bolts 22, the tightening force is transmitted to the upper and lower holding plates 22, 23 via the upper metal spacer 18° tray 20 and the lower spacer 28, and the heat exchanger core 14
Press from above and below. Note that the holding plates 22, 23 . The lower spacer 28 is made of heat-resistant stainless steel.

In addition, as a material for the metal spacer 18 (above, below 1st
As shown in the table 1: Various alloys, pure metals, etc. can be used depending on the brazing temperature. In this first table (Friend
The type and melting temperature of the metal spacer 18 used will be described.

Table 1 (Heat brazing is a process) - 1v Next, heat exchanger core 1 through metal spacer 18 etc.
4, the heat exchanger core 14 is heated in a heating chamber at a temperature of about 600° C. for about 3 minutes to melt the brazing material of the collegated fins 8 and perform brazing. This brazing is performed as vacuum brazing at 10-'Torr.
Brazing may be performed in an inert gas atmosphere such as N2 gas.

By brazing the heat exchanger core 14 through the steps described above, the following effects are achieved.

That is, when the heat exchanger core 14 is heated while being tightened by the restraining jig 16, the brazing material of the corrugated fins 8 is melted. Along with this, the heat exchanger core 14 thermally expands due to this heating.

At this time, since the metal spacer 18 is semi-molten or melted by heating, the pressure that tightens the heat exchanger core 14 does not change much despite the thermal expansion of the heat exchanger core 14. In other words, although the heat exchanger core 14 thermally expands,
The tightening force due to the expansion increases with the metal spacer]8
The pressure that presses the heat exchanger core 14 does not increase or decrease much before and after heating. Therefore, even when brazing is performed using the restraint jig 16, However, excessive tightening will not cause deformation due to force, so it is possible to manufacture a heat exchanger with excellent heat transfer performance. Really molten metal spacer 18
m) - Since it accumulates in the ray 20, it can be prevented from adhering to the heat exchanger core 14.

Next 1: An experimental example conducted to confirm the effect of the manufacturing method of this example will be explained.

In this experiment, the heat exchanger core 14 was temporarily assembled by tightening it with a pressure of several tens of gf/cm'' using the restraining jig 16 described above.

Example using metal spacer 18 and metal spacer 1
Compared to the comparative example that does not use Experiment 8, vacuum brazing at 10-' Torr or inert gas atmosphere brazing using N2 gas is performed. Among these, Experimental Example 1. Experimental Example 2 and Comparative Example 1 are examples in which vacuum brazing was performed, and Experiments 3 to 6 and Comparative Example 2 are examples in which inert gas atmosphere brazing was performed. Then, brazing is performed by observing the state and melting state of the metal spacer 18. As is clear from the experimental examples in Table 2 and above,
Table 1 shows Experimental Examples 1 to 6 in which the corrugated fins 8 were brazed.Whether the brazing atmosphere is a vacuum or an inert gas, brazing can be performed suitably without deforming the corrugated fins 8. Therefore, a heat exchanger with excellent heat transfer performance can be manufactured. On the other hand, metal spacer 1
1 in Comparative Example 1 and Comparative Example 2 without using 8. t. Since the corrugated fins 8 are deformed, it is essential to manufacture a heat exchanger with good heat transfer performance.

Although the embodiments have been described above, the present invention is not limited to the above-mentioned embodiments and can of course be implemented within the scope of the invention.

For example, instead of the plating sheet of the material of the corrugated fin 8 used in the above embodiment, a plating sheet clad with a brazing material having a melting temperature different from that of the above embodiment may be used. Various metal spacers 18 can be used depending on the melting temperature of the brazing material.In addition to the metal spacer 18, a member that melts at the heating temperature, such as plastic, can be used.

Furthermore, the present invention is not limited to the heat exchanger of the above-mentioned embodiments, but also includes heat exchangers of various shapes such as heat sinks, and furthermore, the present invention can be applied to the manufacture of various types of equipment that are joined by brazing using the binding jig 16. Can be used repeatedly.

[Effects of the Invention] In the manufacturing method using the restraint jig of the present invention, when a plurality of members are brazed using the restraint jig, spacers are placed between the members and the restraint jig, so During heating, the spacer becomes semi-molten or molten and can absorb the difference in thermal expansion coefficient between the restraint jig and the member. Therefore, the force pressing each member does not change much during the heating process, It is possible to prevent the members from being deformed due to excessive force during attachment.Furthermore, since the members can be temporarily assembled by pressing them with appropriate pressure, they will not shift during withdrawal.

[Brief explanation of drawings]

Figure 1 (above) An enlarged view of the heat exchanger core fixed with a restraint jig Figure 2 is a perspective view showing the heat exchange tube bent Figure 3 is a corrugated tube attached to the heat exchange tube Figure 4 is a perspective view showing the state in which the fins are arranged, and Figure 5 is a partially broken perspective view showing the state in which the heat exchanger core is fixed with a restraint jig.Figure 5 is a perspective view showing the state in which the heat exchanger core is fixed with a restraint jig. 1... Heat exchange tube 8... Corrugated fin 14... Heat exchanger core 16... Restraint jig 18... Metal spacer

Claims (1)

[Claims] 1. A manufacturing method in which a plurality of members are press-fixed using a restraint jig, a brazing material is placed near the members, and the members are joined by heating and melting the brazing material. When fixing the plurality of members, a spacer that is semi-molten or melted at least at a temperature that heats and melts the brazing material is disposed between the member and the restraint jig. Manufacturing method using a jig.