JPH0957437A - Heater tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heater tip easy in the manufacture and excellent in the durability. SOLUTION: The metallic material such as molybdenum is prepared, contours of a contact part 1, an intermediate part 2, and a connection part 3 are cut from the material using a lathe, and a center hole 4 is made by a drilling machine. A groove 5 is worked by an electric discharge machine, and a fitting hole 6 is made by the drilling machine. A heater tip is fitted to a joining machine, the current I flows while heating a work by the heater tip, and the contact part 1 is heated by its own Joule heat to allow the work to be melted through the heat transfer to obtain the welding. Only the groove 5 is machined by the electric discharge machining, and the manufacturing manhour is reduced. Because the whole shape is cylindrical, the structure is strong against the load in the vertical direction, and difficult to collapse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater chip for performing reflow soldering, thermocompression bonding, resin caulking, etc. by utilizing its own heat generation, and more particularly to a heater having a ring-shaped contact surface with an object to be joined. It's about chips.

[0002]

2. Description of the Related Art Conventionally, a joining machine (reflow soldering) has been used which locally heats an article to be joined, such as thermocompression bonding of a lead wire to a thin film substrate or the like, and reflow soldering of an IC lead to a printed circuit board. Apparatus), and a pulse heating method is one of the local heating methods used in this joining machine. The pulse heating method applies a large current to the heater chip while pressurizing the object to be bonded by a bonding head called a heater chip, and the Joule heat generated there causes the object to be bonded (solder in the case of reflow soldering).
Is melted to obtain a joint.

The heater chip is manufactured in accordance with the shape of the article to be joined, and it may be necessary that the contact surface which comes into contact with the article to be joined has an annular shape. FIG.
(A), (b), and (c) are a front view, a side view, and a bottom view of such an annular heater chip, 16 is an attachment hole for attaching the heater chip to a joining machine, and 17 is an object to be joined. It is a contact surface that contacts an object. When manufacturing this heater chip, most of the machining is performed by an electric discharge machine using a wire as a machining electrode.

[0004]

As described above, the conventional annular heater chip has a problem that it takes a long time to manufacture because most of the machining depends on the electric discharge machine. Further, although the above-mentioned pulse heating method applies pressure in the vertical direction to the objects to be joined, the conventional annular heater chip has a problem that it is relatively weak against the load in the vertical direction and is easily broken. The present invention has been made to solve the above problems, and an object of the present invention is to provide an annular heater chip that is easy to manufacture and has excellent durability.

[0005]

A heater chip of the present invention has a cylindrical contact portion whose lower end surface is a contact surface and a cylindrical shape which is integrated with the upper end of the contact portion. The groove is formed so as to be cut in the direction, and is divided into left and right up to the contact portion, and a mounting portion for mounting on the joining machine is formed on the side surface. Due to such a shape, only the machining of the groove depends on the electric discharge machining.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 (a), (b), (c),
(D) is a plan view, a front view, a side view, and a bottom view of a heater chip showing one embodiment of the present invention. Reference numeral 1 denotes a contact portion whose lower end surface serves as a contact surface 7 with an object to be joined (hereinafter referred to as a work) not shown, 2 is an intermediate portion between the contact portion 1 and a connection portion described later, and 3 is a heater chip. For connecting to a joining machine (not shown), 4 is a central hole formed so as to vertically penetrate the heater chip, and 5 is a groove formed so as to divide the intermediate part 2 and the connecting part 3 into left and right parts. , 6 are attachment holes for attaching the heater chip to the joining machine.

Next, a method of manufacturing such a heater chip will be described with reference to the process chart of FIG. First, a cylindrical material made of a heat-resistant metal such as molybdenum is prepared, and the outer shapes of the contact portion 1, the intermediate portion 2, and the connection portion 3 are cut out from this material by a lathe (FIG. 2A). In the present embodiment, the contact portion 1
Since the diameter of the contact portion is smaller than the diameter of the connecting portion 3, the intermediate portion 2 having a continuously changing diameter is provided between the contact portion 1 and the connecting portion 3. The diameter of the contact portion 1 is determined by the work. And the diameter of the connection 3 is determined by the splicer.

Therefore, the contact portion 1 and the connecting portion 3 may be made to have the same diameter, and in this case, the intermediate portion 2 does not exist. Further, contrary to the present embodiment, the contact portion 1
In some cases, the diameter of is larger than the connecting portion 3.

Then, the contact portion 1, which is cut out in this way,
A central hole 4 is formed in the intermediate portion 2 and the connecting portion 3 so as to vertically pass therethrough by a drilling machine (FIG. 2B). The center hole 4 serves as a relief for the work. Then, the groove 5 that divides the intermediate portion 2 and the connecting portion 3 into the right and left is formed by an electric discharge machine using a wire (machining electrode) having a wire diameter of 0.2 mm (FIG. 2C).

The reason why the groove 5 is provided is that the contact portion 1 has an electric resistance, and that the contact portion 1 is a main heat generating portion of the heater chip. Finally,
Mounting hole 6 for mounting the heater chip on the joining machine
Is opened by a drilling machine (Fig. 2 (d)). This completes the fabrication of the heater chip.

The heater chip thus manufactured is attached to a bonding machine, and a current I as shown in FIG. 1B is applied to the heater chip while pressurizing the work with the heater chip, so that the contact portion 1 itself. It heats up with the Joule heat of
The work is melted by heat conduction, and a bond is obtained.

According to the heater chip as described above, the groove 5
Since the shapes except for can be processed by a lathe and a drilling machine, the number of manufacturing steps can be shortened as compared with the heater chip of FIG. Further, since the whole is cylindrical, it is stronger against vertical load than the heater chip of FIG. 3 and is less likely to break.

[0013]

According to the present invention, since the contact portion and the connecting portion are formed in the shape based on the cylinder, they are stronger in the vertical load than the conventional heater chip, so that the heater chip is excellent in durability. Can be realized. Further, since the electric discharge machining is only used to form the groove dividing the contact portion, the manufacturing time of the heater chip can be shortened as compared with the conventional case.

[Brief description of drawings]

FIG. 1 is a plan view, a front view, a side view, and a bottom view of a heater chip showing an embodiment of the present invention.

FIG. 2 is a process drawing for explaining a manufacturing method of the heater chip of FIG.

FIG. 3 is a front view, a side view, and a bottom view of a conventional heater chip.

[Explanation of symbols]

1 ... Contact part, 2 ... Intermediate part, 3 ... Connection part, 4 ... Center hole, 5
... Grooves, 6 ... Mounting holes, 7 ... Contact surface.

Claims (1)

[Claims] 1. A heater chip that has a ring-shaped contact surface with an object to be bonded and heats the object to be bonded while applying pressure, and a cylindrical contact portion whose lower end surface is the contact surface and a contact portion of the contact portion. It has a cylindrical shape that is integrated with the upper end, and this cylinder is divided into left and right parts up to the contact part by a groove formed so as to cut out in the vertical direction, and a mounting hole for mounting on the joining machine is formed on the side surface. A heater chip, characterized in that the heater chip comprises a connection part formed by punching.