JPS6226364A - Manufacture of automobile surge tank - Google Patents

Abstract

PURPOSE:To reduce manufacturing cost and improve joining surface accuracy of a surge tank by removing oxide layer from upper and lower joining surfaces in eutectic solder liquid by using ultrasonic waves and then soldering the joining surfaces. CONSTITUTION:A surge tank C is manufactured from two aluminum diecast parts, a box part 1 and a covering part 2, separated at a line of soldering part 5. A joining surface of the box part 1 is immersed into eutectic solder liquid 9 to remove oxide layer completely by the vibration of an ultrasonic vibration plate 7 vibrated by an ultrasonic wave generator 6 and to produce temporally soldered condition. The covering part 2 is similarly processed to produce the temporally soldered condition. When both parts are brought to the temporally soldered condition, they are pulled out of a furnace 8, two joining surfaces are put together and immediately soldered. As a result, a hollow diecast product of small thickness without any pinhole and the like is formed. An intake manifold is similarly formed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing a surge tank or intake manifold that supplies atomized gasoline to an internal combustion engine. This method is widely used as a manufacturing method for shaped products.

(Prior art) As the prior art related to the present invention, (1) the surge tank or intake manifold is made of aluminum casting with a core arranged in one piece because of its hollow shape; It is shown in Figure 11. A is a hollow surge tank, and B is an automobile engine. In addition, there is a publication of (2) Utility Model Application No. 58-94824 r Surge Tank for Internal Combustion Engines, in which the surge tank for internal combustion engines is made of aluminum die-cast and divided into upper and lower parts, and the joint surface of the flange is It is disclosed that uneven portions are provided and the uneven portions are fitted together to form an integral structure.

(Problems to be solved by the invention) However, the method of casting with aluminum casting shown in (1) above,
Since it is a cast product, it tends to leave defects such as holes in the aluminum material, has poor dimensional accuracy, and has poor productivity, resulting in high costs. In tanks, there is a problem in that the accuracy of the uneven grooves on the joint surface is uneven, resulting in high costs.

The object of the present invention is to provide a method for joining hollow-shaped products that can be reliably and easily joined together in a surge tank or intake manifold made of aluminum die-cast and divided into upper and lower halves. be.

[Structure of the invention]

(Means for solving the problem) A means for solving the above technical problem is to use brazing in the surge tank or intake manifold, which is divided into upper and lower parts and is made of die-cast aluminum, used in automobile engines. It is intended to be integrated by

(Operation) The technical means operates as follows. In other words, after removing the strong oxide film that has formed on the surface of the joint surface of the surge tank or intake manifold, which is divided into two parts, the lid part and the whistle part, using ultrasonic waves, temporary brazing is performed, and the joint surfaces of the two parts are brought together and brazed. This is what we do.

Once the surge tank or intake manifold has been temporarily brazed, it is taken out of the furnace, the mutual joint surfaces are brought together, and brazing is immediately performed at a temperature of 420 to 450°C.

The ultrasonic waves are vibrations of an ultrasonic diaphragm (17 to 20 KHz)
The oxide film can be completely removed by this method.

(Example) Specific examples will be described below.

1 to 5, C is a surge tank, 1 is a sheath, 2 is a lid, 3 is a hole for introducing air into the surge tank, and 4 is a lid. 5 indicates the position of the brazing part.

la, lb, ... are the partition walls of the sheath part, 2a.

2b, . . . are partition walls of the lid portion.

6 is an ultrasonic transmitter, 7 is an ultrasonic diaphragm, 8 is a furnace, 9
is the liquid of eutectic brazing filler metal. 10 indicates a heating device.

To describe its function in the above configuration, the surge tank is divided into two parts, a sheath part and a lid part, along the line of the brazed part 5, and each part is manufactured by die-casting, and the joint surface of the sheath part is made of eutectic metal. Brazing filler metal liquid 9 (for example, Chubu Almit Kogyo A)
M-350) and the ultrasonic diaphragm is vibrated (approximately 17 KHz to 20 KHz) using an ultrasonic vibration device to completely remove the oxide film. The lid part is also temporarily brazed in the same manner. In this case, the width of the filler metal is approximately 2C11
By dipping to a depth of
Next, once the sheath and lid have been temporarily brazed, they are pulled out of the furnace, their joint surfaces are aligned, and brazed immediately, as shown in Figure 5, at a brazing temperature of 420 to 450°C.
It is.

In this way, the surge tank shown in C is manufactured.

This is a thin-walled two-part Guicast hollow product with no holes etc., which are integrally formed by brazing.

Figures 6 to 10 show other embodiments, D is an intake manifold made of Guicast, and the upper part 11 and lower part 12 are 13.
It is divided into two parts at the position shown in .

The two divided intake manifolds are immersed in the crystal brazing filler metal liquid 9 and the ultrasonic diaphragm is vibrated by an ultrasonic vibrator to remove the oxide film and then joined by brazing. The intake manifold is made of cast material and has a hollow shape with no holes.

〔Effect of the invention〕

The present invention has the following unique effects. That is, it is lightweight and robust as a guicast product for a surge tank or intake manifold of an automobile internal combustion engine.

However, there is a hollow, lightweight surge tank made of resin (Japanese Patent Application Laid-Open No. 58-162724), but the surge tank is divided into upper and lower parts, each of which is a resin molded product, and metal is inserted into the connection part such as a pipe. However, the Gwicast product of the present invention is a serge resin that is completely bonded by brazing. This tank or intake manifold is a die-cast hollow product that is extremely lightweight, can withstand high temperatures in the engine room, and is reliable.

[Brief explanation of drawings]

Figure 1 is a partially cutaway plan view of the surge tank.
Figure 2 is a side view of Figure 1, Figures 3 to 5 are the joining process diagrams of the surge tongue divided into two parts, Figure 3 is the upper temporary brazing process diagram, and Figure 4 is the lower part. 5 is a cross-sectional view showing the process immediately before brazing, FIG. 6 is a side view of the intake manifold, FIG. 7 is a plan view of FIG. 6, and FIG. Figure 8 is a process diagram for temporarily brazing the upper part of the intake manifold, and Figure 9 is a process diagram for temporarily brazing the lower part of the intake manifold.
FIG. 0 is a sectional view taken along line EE in FIG. 7 just before brazing. FIG. 11 is a side view, partially in section, of the surge tank attached to the engine. B... Internal combustion engine, C... Surge tank, D... Intake manifold, 1... Upper part of surge tank,
2... Lower part of the surge tank, 5°13... Brazing position, 6... Ultrasonic generator. 8... Furnace, 9... Eutectic brazing filler metal liquid, 11... Upper part of intake manifold, 12... Lower part of intake manifold

Claims (1)

[Claims] In an automobile surge tank or intake manifold made of die-cast aluminum divided into two halves, upper and lower, the joint surface of the two halves is immersed in a eutectic brazing filler metal liquid in a furnace and the oxide film is removed by ultrasonic waves. A method for manufacturing a surge tank or an intake manifold, in which the joining surfaces are plated in a temporarily brazed state, and then the joining surfaces are joined by brazing.