JPS6068183A - Solid-phase joining method - Google Patents

Abstract

PURPOSE:To minimize deformation of a pair of objects to be joined and to join surely said objects by heating the objects then pressurizing axially the objects and pressurizing the joint part in the direction perpendicular to the axial direction thereby joining the objects. CONSTITUTION:A pair of objects 5, 5 to be joined are grasped respectively by chucks 2, 3 and a joint part 5a is set between an upper jig 10a and a lower jig 10b of a restraining jig 4 for deformation. After the entire part of the device is maintained in a vacuum inert gaseous atmosphere, the jig 4 is heated to heat the objects 5, 5. When the objects 5, 5 attain a specified temp., the objects 5, 5 are axially pressurized by axially pressurizing cylinders 9, 9 and at the same time a pushing means 14 is lifted by the lower cylinder 13 of the jig 4. The joint parts 5, 5 are held for specified time while the joint part 5a is pressurized in the direction perpendicular to the axial direction. The deformation is thus suppressed and the press contact force to the end face of the part 5a is increased. The solid- phase joining with high strength is thus accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid phase welding method for joining a pair of objects made of metal materials by applying mechanical pressure and heating.

Solid phase bonding is known as a means for bonding a pair of objects to be bonded. This solid-phase bonding is performed by abutting the end surfaces of a pair of objects to be bonded, and heating and pressurizing the bonded portion to a bonding temperature. According to such solid phase bonding,
It has the advantage of not causing a decrease in mechanical strength due to changes in the metal structure, unlike joining by welding.

Conventionally, when solid phase welding of long objects to be welded, the objects to be welded are clamped near their ends with chucks, and pressure is applied to the objects along their axial direction via the chucks. I was trying to add it. However, this method has the disadvantage that when the object is pressurized, the portion of the object located between the pair of chucks is inevitably deformed.

Therefore, as shown in Japanese Unexamined Patent Publication No. 53-34657, one end of the thin plates is brought into contact with each other, and while applying pressure to the abutting surfaces, the thin plates are kept at an arbitrary temperature within the range of 6 + ioo degrees Celsius from the transformation point. There is one in which pressing force is applied to the abutting surface in a direction perpendicular to the pressure direction (by means of a water-cooled die).

However, the above method does not utilize the dynamic superplastic phenomenon and instead joins in a solid state, and the objects to be joined are limited to plate-shaped objects, and cannot join superconducting wires made of composite materials. It's impossible.

This invention was made in view of the above circumstances, and its purpose is to provide a solid-phase joining method that can minimize deformation of objects to be joined and reliably join them. It is.

The present invention will be described below based on an embodiment shown in the drawings. In the figure, reference numeral 1 denotes a base, and a first chuck 2 and a second chuck 3 are installed at both ends of the pace 1 in the longitudinal direction, and between these, the first chuck 2 and the second chuck 3 are installed. A deformation restraint jig 4 is provided apart from the second chuck 2°3.

Above 1. Since the second chucks 2 and 3 have the same structure, only one of them will be explained. It consists of an upper chuck 6 and a lower chuck 7 that clamp the workpiece 5, and these are opened and closed by a chuck pressure cylinder 8. It has become so. Further, the upper and lower chucks 6.7 are connected to an axial pressure cylinder 9 that presses the welded portion 5 in the axial direction, and the welded object held by the upper and lower chucks 6.7 by the axial pressure cylinder 9. 5 in the axial direction. The deformation restraint jig 4 is divided into an upper jig 10m and a lower jig 10b, and the joint portion 5a of the pair of objects 5, 5 to be welded is accommodated between them. The upper jig 10a is provided with an upper cylinder 11 that presses toward the lower jig 10b.

Further, a through hole 12 is formed in the lower jig 10b, and a pusher 14 that is moved up and down by a lower cylinder 13 is inserted into this through hole 12.

Next, the solid phase bonding method will be explained. First, a pair of objects 5, 5 are placed between the first chuck 2 and the second chuck 3.
The upper jig 10h and the lower jig 1 of the deformation restraining jig 4 hold the joint portion 5a close to each other at the end faces thereof.
Set between 0b and 0b. Next, after the entire apparatus is placed in a vacuum inert gas or reducing gas atmosphere, the deformation restraint jig 4 is heated to heat the object 5.5 to be welded. When the workpiece 5.5 reaches a certain temperature in this state, the workpiece 5.5 is pressurized in the axial direction by the axial pressure cylinders 9, 9, and the lower cylinder 13Vc of the deformation restraint jig 4 is pressed. Therefore, the pushing tool 14 is pushed up, and the objects to be welded 5, 5 are pushed up.
The joint portion 51L is pressurized in a direction perpendicular to the axial direction and held for a certain period of time. In this way, when the objects 5, 5 to be welded are pressurized in the axial direction, the joint portion 5a tends to deform in the direction perpendicular to the axial direction, but the joint portion 5a is contained by the deformation restraint jig 4, and is not pressed. Since it is pressed by the tool 14, deformation is suppressed, and the pressing tool 14 increases the pressure welding force on the end faces of the joint portion 5&, resulting in high-strength solid phase welding.

Moreover, when taking out the objects 5, 5 to be welded after welding, the first. The second chucks 2 and 3 are opened, and the upper cylinder II of the deformation restraint jig 4 is also opened. Then, after opening the upper jig 10a and the lower jig 10bf, the lower cylinder 13 is operated and the pushing tool 14 is pushed upward, and the objects 5, 5 to be welded are taken out from the deformation restraint jig 4.

Note that if the bonding atmosphere is in the air υ, and the objects to be bonded 5 are oxidized even in an inert gas atmosphere, the deformation restraint jig 4 is pressurized, the first and second chucks 2, 3 and then heated, and when the joining temperature is reached, the presser 14 is pressed by the lower cylinder 13 and held for a certain period of time to form multiple joints U.

As explained above, this invention heats a pair of objects to be welded and then pressurizes them in the axial direction, or pressurizes them in the axial direction and then pressurizes them. Since the joint is applied by applying pressure perpendicular to the direction, a large pressure is applied to the joint by the pressure in the axial direction and the pressure from the direction perpendicular to the axis, resulting in a high-strength solid phase weld. Ru. According to the inventor's experiments, copper was conventionally used at 550%
When bonded at .degree. C., the deformation rate in the thickness direction is 9 to 18%, but according to the present invention, it can be suppressed to 6% or less, which is particularly effective for solid phase bonding of superconducting wires.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a front view of the entire device, FIG. 2 is a vertical side view of the deformation restraint jig, and FIG. 3 is a vertical front view of the same. 5... object to be joined, 5IL... joint part. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] After heating a pair of objects to be joined, pressure is applied in the axial direction, or after applying pressure in the axial direction, heating is performed, and then the joint portion of the pair of objects to be joined is aligned in the axial direction of the objects to be joined. A solid phase bonding method characterized by applying pressure in a right angle direction and maintaining this pressurized state for a certain period of time to solid phase bond objects to be bonded.