JP2007167950A - Brazing method and brazing fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for brazing a metallic component by using a fixture which is easily produced, has small heat capacity, and can securely hold an assembly to be brazed, and to provide the fixture for use in the method. <P>SOLUTION: The method for brazing the metallic component by using the fixture comprises a step of combining and fixing a plurality of component members to be brazed on the brazing fixture with plurality of projections 3, 4, 5 formed by cutting parts of the body of a metallic sheet 1 and raising to one side of the sheet, a step of applying brazing material to them, and a step of putting them into a brazing furnace together with the fixture to braze them. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a brazing method and a jig used therefor, and more particularly to an improvement of a brazing method for metal parts.

  When manufacturing a metal part with a complicated shape that is difficult to be integrally formed, a method is generally used in which the part is divided into several components and processed, and then joined by brazing. . In such brazing, a method is known in which a brazing material is applied in advance to the parts to be brazed, and is then introduced into a heating furnace such as a hydrogen atmosphere furnace or a high-frequency furnace to be melt-bonded. However, in the case of small metal parts having a plurality of brazing points, the position of the brazing point is shifted or the angle is changed due to the vibration of the conveying device such as a belt conveyor and the high temperature atmosphere in the furnace. was there.

  Many proposals have been made for improving the brazing method.

  For example, in Patent Document 1 (Japanese Patent No. 2546548), a block having excellent thermal conductivity is in contact with a bottom side that moves a firing furnace of a jig that covers at least a substrate to be brazed. A method of brazing by moving the inside is disclosed.

  This document shows a brazing method in which parts to be brazed are placed on a jig and conveyed to a muffle furnace by a belt conveyor. However, this technique is intended for ceramic substrates, and aims to reduce the difference in temperature rise between the top and bottom of the ceramic substrate to be brazed. The substrate to be brazed is surrounded by jigs at the top and bottom, and the jigs are placed on a tray and conveyed into the furnace. In the case of a small metal part to which the present invention is applied, if the entire part is covered with a jig, heat is taken by the jig and brazing does not work well or the temperature must be increased. In addition, the jig itself is complicated, and it takes time and effort to place the jig on the tray, resulting in poor workability and an increase in cost.

  In Patent Document 2 (Japanese Patent No. 3330987), in a brazing method for a metal product, a base material and a part to be brazed in a box-shaped heat insulating container that surrounds a work lower surface and a side surface and is opened upward. A method is disclosed in which a workpiece made of is placed in a predetermined positional relationship and fixed by a holding jig and then brazed.

  This technology uses a gas burner flame and pulse heating to braze, and therefore requires a heat insulating container. However, since the heat insulating container is a heat insulating material, it has a large heat capacity and cannot be used by brazing using a heating furnace as intended by the present invention.

  Further, in Patent Document 3 (Japanese Patent Application Laid-Open No. 2003-334652), a tray that supports a work is provided with a support means that supports the work by point contact or line contact, and this support means is used when the work is heated or cooled. A method of brazing a workpiece having flexibility in the axial direction so as to absorb a difference in expansion and contraction caused by a difference in thermal expansion coefficient between the workpiece and a support member is disclosed.

  The object of this document is a heat exchanger such as a vehicle radiator or a hot water heater, which is placed on a tray and put into a furnace. Therefore, it is completely different from the small metal part intended by the present invention. In addition, this document proposes a three-dimensional and complicated tray, and when such a tray is used for brazing small parts, the heat is taken away by the tray and brazing is not successful, Or there exists a problem that the temperature of a furnace must be set high.

Japanese Patent No. 2546548 Japanese Patent No. 3330987 Japanese Patent Laid-Open No. 2003-334652

  The present invention solves the above-described problems, and is a method for brazing metal parts using a jig that is easy to manufacture, has a small heat capacity, and can securely hold brazed parts, and a jig for the same. The purpose is to provide ingredients.

  In order to solve the above-described problems, in the brazing method according to the present invention, a plurality of component constituent members are brazed onto a brazing jig in which a part of a metal sheet body is cut and raised on one side of the sheet to form a plurality of protrusions. These are fixed in combination, and after the brazing material is applied, the jig together with the jig is brazed and brazed.

  It is desirable that the plurality of protrusions include at least a bottom surface holding portion that holds the bottom surface of the brazed component and a side surface holding portion that biases and holds the side surface of the brazed component.

  It is preferable that a large number of notches are provided on the metal sheet main body including the protrusion forming portion.

  The brazing jig according to the present invention is characterized in that a part of the metal sheet body is cut and raised on one side of the sheet to form a plurality of protrusions so as to be compatible with the brazed part.

  It is desirable that the plurality of protrusions include at least a bottom surface holding portion that holds the bottom surface of the brazed component and a side surface holding portion that biases and holds the side surface of the brazed component.

  More preferably, a U-shaped recess is formed at the tip of a part of the plurality of protrusions.

  A through hole may be provided in a part of the plurality of protrusions corresponding to the end portion of the brazing component to be placed.

  It is preferable that a large number of notches are provided on the metal sheet main body including the protrusion forming portion.

  In the brazing method according to the present invention, the heat capacity can be reduced by using a jig formed from a metal sheet, and the influence on the temperature rise of the components in the brazing furnace is extremely small and economical. In particular, the total heat capacity difference can be reduced with respect to changes in the number of jigs charged in the furnace, the followability of the furnace temperature is improved, and highly reliable brazing is possible. In addition, it makes it easier to set the furnace temperature. In addition, since the jig forms a holding portion that holds the component by cutting and raising a part from the metal sheet main body, it is possible to prevent the risk of positional deviation and angular deviation in the brazing furnace where the component is securely held. In the case of a jig using a clamp having a sliding part, the clamp may be fixed due to deformation due to heat or a product due to heat, and the work may be interrupted. However, the clamp using the deflection according to the present invention operates reliably. . Furthermore, since this holding part is a tip part cut and raised from the metal sheet, the part that comes into contact with the part is basically a line corresponding to the thickness of the metal sheet, minimizing the effect on the temperature rise of the part. Can do. In addition, this jig is basically formed so as to support only the lower surface and the side surface of the component to be brazed, so that it can be attached and detached with one touch, and the operation can be performed very efficiently.

  About the side surface holding part that supports the component side surface, the component side surface can be urged by the repulsive force of the spring when the component is mounted by slightly tilting the angle toward the component side.

  About the protrusion part holding a component, the holding force with respect to a component can be improved by devising shapes, such as forming a U shape or a through-hole according to a component shape.

  Further, by forming a large number of notches in the metal sheet body, the jig can be made lighter and the heat capacity can be reduced.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIGS. 3 and 4 show the shapes of parts to be brazed as an example. The component main body 12 is hollow and has an inlet opening 11 and two outlet openings. The inlet opening 11 and the outlet opening communicate with each other inside the main body 12. A curved pipe 13 is connected to each outlet opening, and a connecting member 14 having a male thread portion is provided at the pipe outlet.

  In the case of such a part, the main body 12, the pipe 13 and the connecting member 14 are individually processed and then joined by brazing. Therefore, even in such a small part, it is necessary to braze a total of four places including two joint portions between the main body 12 and the pipe 13 and two joint portions between each pipe and the connecting member.

  In the conventional case, the components are assembled and placed on the tray, and the brazing material is applied and then put into the brazing furnace. However, the angle between the main body 12 and the pipe 13 or the pipe due to the vibration of the belt conveyor or the like. The positional relationship between 13 and the connecting member 14 may be shifted, and the yield is low.

  FIG. 1 shows a perspective view of a brazing jig according to the present invention. A number of cutout holes 2 are formed on the metal sheet main body 1, and a part of the cutout holes 2 are cut and raised to serve as component holding projections. The protrusion has a tip shape changed according to the part shape. The circular part of the component body and the part that holds the pipe are the bottom surface holding part (1) 3 in which a concave part is formed in a U shape corresponding to the curvature, and the part with a flat bottom part has a flat projection tip. This is the shape of the bottom surface holding part (2) 4. The component main body 11 has a circular shape at both ends and a swelled central portion. The component main body 11 is securely fixed by being fitted to a portion surrounded by the bottom surface holding portion 3 and the bottom surface holding portion 4 of the jig main body 1. can do. Further, by fitting the connecting member 14 between another bottom surface holding portion 3 and the side surface holding portion 5, the pipe bottom surface is supported by the bottom surface holding portion 3, and the end portion of the connecting member 14 is supported by the side surface holding portion 5. Since it is biased and held on the main body side, the entire part is held securely in position. In order to apply a spring-like urging force to the side surface holding portion 5, the metal sheet is made of stainless steel, and when the side surface holding portion protrusion 5 is cut and raised, the angle is slightly tilted toward the bottom surface holding portion 3 side. By doing so, when the connection member 14 of the part is fitted, the pipe side end portion of the connection member is locked by the bottom surface holding portion 3 and the other end portion is urged by the side surface holding portion 5. The connecting member 14 itself is also fixed and held on the spot.

  FIG. 2 is a plan view of a jig according to the present invention. A number of cutout holes are provided on the metal sheet 1, but the portion where the above-described component holding projection is formed is a rectangular cutout hole, and the other portions are punched into a circle. The reason why many such cutout holes are formed is to make the jig itself lighter and at the same time reduce the heat capacity as much as possible to increase the efficiency of brazing.

  Next, the brazing method according to the present invention will be described. After the component main body 11, the pipe 13 and the connection member 14 are individually processed, they are assembled and placed on the jig 1 described above. In this case, the parts were made of stainless steel. Subsequently, silver brazing (mainly silver and copper) is applied to each part to be brazed. This part is mounted on a belt conveyor of a hydrogen atmosphere furnace (for example, manufactured by Tokyo Blaze) together with a jig. The brazing conditions were 1000 to 1100 degrees and 50 to 60 minutes. The parts coming out of the furnace are brazed neatly and can be easily detached by pulling the jig apart.

  According to the present invention, not only small parts can be brazed reliably and easily, but also the installation / removal setup becomes extremely simple, so that the convenience of brazing parts can be greatly improved. In the furnace brazing, many jigs are required, but the jig according to the present invention is inexpensive and can be easily mass-produced.

The perspective view of the Example of the jig for brazing by this invention is shown. FIG. 2 shows a plan view of the embodiment of FIG. It is a perspective photograph of the components used for the brazing method of the present invention. It is the photograph seen from the upper part of the components shown in FIG.

Explanation of symbols

1 Metal sheet body 2 Notch hole 3 Bottom surface holding part projection (1)
4 Bottom support projection (2)
5 Side support projection 11 Entrance opening 12 Component body 13 Pipe 14 Connection member

Claims (8)

A part of a metal sheet main body is cut and raised on one side of the sheet, and a plurality of component component members to be brazed are combined and fixed on a brazing jig formed with a plurality of protrusions, and then a brazing material is applied. A method of brazing a part, characterized by being brazed in a brazing furnace. 2. The method of brazing a component according to claim 1, wherein the plurality of protrusions include a bottom surface holding portion that holds at least a bottom surface of the brazing component and a side surface holding portion that biases and holds the side surface of the brazing component. . 3. The component brazing method according to claim 1, wherein a plurality of notch holes including the protruding portion forming portion are provided on the metal sheet main body. A brazing jig, wherein a part of a metal sheet body is cut and raised on one side of the sheet to form a plurality of protrusions so as to be compatible with a brazed part. The brazing jig according to claim 4, wherein the plurality of protrusions include at least a bottom surface holding portion that holds the bottom surface of the brazing component and a side surface holding portion that biases and holds the side surface of the brazing component. . The brazing jig according to claim 4 or 5, wherein a U-shaped recess is formed at a tip of a part of the plurality of protrusions. The brazing jig according to any one of claims 4 to 6, wherein a through hole is provided in a part of the plurality of protrusions corresponding to the end portion of the brazing component to be placed. The brazing jig according to any one of claims 4 to 7, wherein a number of notches including the protruding portion forming portion are provided on the metal sheet main body.

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