JPS58154473A - Cold press welding method - Google Patents

Abstract

PURPOSE:To perform cold press welding thoroughly even if materials to be welded have a large difference in thickness or deformation resistance, by forming a projecting part in the intended welding part of the material having the larger thickness or smaller deformation resistance and crushing the same. CONSTITUTION:Covering layers of, for example, Ni or Cr, harder than base materials are deposited on at least the press welding surfaces of a base body 5 and a cover 6. Thereafter, the collar part 7 of the body 5 is placed on the lower tooth part 15 of a lower press molding die 12. The cover 6 is placed on the body 5 in such a way that a projecting part 9 contacts the intended press welding part of the collar part 10 of the body 6. When an upper press molding die 13 is brought down and is grasped under pressure by an upper tooth part 17 and the part 15, the projecting part 9 is crushed and the fresh surface not deposited with the oxidized film appears on both of the body 5 and the cover 6 in the press-welded part, whereby the body 5 and the cover 6 are cold press- welded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cold welding method, and particularly to a cold welding method suitable for cases where the thickness of objects to be welded is significantly different or for cold welding between hard and soft materials. . .

[Technical backlash of the invention and its problems 1 Conventionally, when the plate thicknesses of the pressurized objects are different or the hardness of the pressurized objects is different from each other, one of the pressurized objects with a thinner plate thickness or hardness is used. Since only the soft object to be pressed is deformed, and the other object to be pressed is not deformed, the new surfaces of both base materials that are subject to the plastic flow at the joint are no longer joined to each other. In addition, if the processing rate is large, the workpiece to be pressed with a thin plate or
There is a risk that the object to be welded with soft nails may break apart. Therefore, in the past, as shown in Fig. 1, a pressure welding type (1
) (2) face width L+, L2 and protrusion angle θ1. Adjust θ2 appropriately depending on the thickness and hardness of the objects (3) and (4) to be pressed. By setting this, the pressure welding property was improved. However, even with this method, the pressure contact objects (31, (4
) If the difference in hardness is significantly large, the deformation resistance is significantly different, or if the difference in plate thickness is significantly large, the pressure weldability will not improve. Therefore, when the pressurized object is a sealed container, the sealing performance is incomplete, which is a factor contributing to the low reliability of equipment housed in this container.

[Objective of the Invention 1 It is an object of the invention to provide a cold welding method that can obtain good pressure welding properties even if the difference in plate thickness or the difference in deformation resistance of the objects to be welded is extremely large.

[Summary of the Invention g] Among a pair of press-welded objects having a significant difference in plate thickness or deformation resistance, the pressure-welded portion of one of the press-welded objects, which has a larger plate thickness or a smaller deformation resistance, is applied to this pressure-welded portion. In this method, cold pressure welding is performed by forming a wet protrusion.

Embodiments of the Invention The present invention will now be described in detail based on embodiments with reference to the drawings.

As shown in FIG. 2, the pressurized kiss in this embodiment consists of a base (5) made of, for example, brass and formed into a cylinder with a bottom.
A circular body (made of steel, etc.) with approximately the same inner diameter as the base body (5) described above, which seals the circular opening of this viscous body (5) to form a hermetically sealed container for storing precision measuring instruments, electric elements, etc.
6). At the open end of the base body (5), a row part (force) is protruded, and as shown in Figure 3, this collar part (force contact surface (8)) The annular protrusion (9) is formed by pressing, cutting, casting, etc. in advance.
The flange part (flange part 01 that opposes the force) of the F base body (5) is press-molded, and this flange part (11) has a tongue part 0υ inside the planned pressure welding area to improve the pressure welding property. 7. The thickness of the upper ml lid body (6) is much thinner than the thickness of the base body (5), for example, if the thickness of the base body (5) is 20 to 30 mm. In contrast, the lid body (
6)'s 19 is ()5'' as much as C, f. Shita, 3rd
1 profit of the protrusion (9) shown in the figure! :h is formed to be approximately the same thickness as the lid (6). In short, the size of the protrusion (9) needs to be large enough to be crushed by cold welding for reasons described later. Furthermore, as shown in FIG. 2, the press-contact mold used in this embodiment consists of an upper press-contact mold 021 and an upper press-contact mold (13), both of which accommodate the base body (5) and the lid body (6). It is formed into a cylinder with a bottom. Then, one part pressure welding type [12
1 has a rectangular cross section in the radial direction on the upper end surface Oa,
The lower toothed part f15 whose upper surface is in contact with the seventh flange (base body Q5 in contact with F1#i of 1 (2)) and is supported in part of the pressure contact type (12)
1 is provided protrudingly in an annular shape. 1. The lower pressure welding mold (1) is a part of the cold pressure welding equipment, and is held and fixed on the 11 board.

A constant tooth width and protrusion angle as shown in Fig. 1 is formed on the lower end surface (16) of the upper press mold (13) corresponding to the area where the lid body (6) is to be press-fitted. The toothed part (
lυ is provided protrudingly in an annular shape. The above upper pressure welding type (13
Although not shown, 1 is attached to a pressurizing mechanism using hydraulic pressure or the like of a cold pressure welding device. 5) and the lid (6), first, at least the press-contact surfaces of the base (5) and the lid (6) are coated with sushi or C', etc., by, for example, non-drying plating. The coating layer, which is harder than the base material, is ruptured.Then, the flange (7) of the base (5) is placed on the lower teeth (151) of the upper press mold (121). body(
G) is placed on the base (5) l so that the protrusion (9) comes into contact with the area where the flange of the lid (6) is to be pressed. Then, lower the upper pressure contact mold (131 in the direction of the arrow 181 in Figure 2) and press it with the lower teeth (17) and the lower teeth (1), and the protrusion (9) will be crushed. As a result of this crushing, a new surface not covered with an oxide film appears on both the base body (5) and the lid body (6) at the pressure welding site, and the base body (5) and the lid body (6) Furthermore, during cold welding, a hard coating layer with lower ductility than the welded material is interposed between the welding surfaces, so the coating layer becomes wet as the cold welding progresses. The joint is fractured, and a new surface expands from this fractured part.Therefore, the protrusion (9) is provided and a fragile coating layer with lower ductility than the welded material is interposed at the joint. Together, the lid body (6
) As the cold welding progresses, a new, unoxidized surface appears on the pressure welding surface of the substrate (5), which is much thicker, on the container as the cold welding progresses, so that the cold welding can be carried out completely.

Furthermore, in this example, the formation of a round part of the tongue also contributes to the improvement of the pressure contact property. −.

Furthermore, even without intervening the coating layer of NI or C in the above embodiments, the formation of the protrusions alone is sufficient in terms of cold weldability. Even if there is no layer, it is within the scope of the present invention.Example F is an example of a case in which one of a pair of objects to be pressed is significantly thicker than the other. However, the present invention is limited to this; 'c < , even if the i is almost the same, but the hardness is significantly different (the difference in deformation resistance is large), as in the case of iron-based metals and aluminum-based complete sets, It is possible to improve the pressure welding rate by forming a protrusion on the object to be pressed which has a large hardness (low deformation resistance).Furthermore, in the above embodiment, the projection is formed only on one side of the object to be pressed. However, the same or better effect can be obtained by providing protrusions facing each other on the objects to be pressed in both 7i.In this case, one protrusion is concave and the other is convex. An even better effect can be obtained if the joints are formed so that they fit together during pressure welding.Furthermore, in the embodiment F, the heel pressure contact type (the first floor is a flat flat type without teeth) is used. 1) [Advantageous Effects] The present invention makes it possible to perform cold welding perfectly even when there is a significant difference in plate thickness or deformation resistance between wave welded objects. In other words, the + invention is suitable for manufacturing sealed containers, and contributes to improving the reliability of precision measuring instruments, d-crystals, etc. that are housed in sealed containers.

[Brief explanation of the drawing]

Fig. 1 shows a conventional cold welding method, and Fig. 2 shows a cold welding method according to an embodiment of the present invention.
The plan view, FIGS. 3 and 3 are cross-sectional views of essential parts showing the protrusion in FIG. 2. (5): Base (object to be pressed), (61: Lid (object to be pressed), (9): Projection. Agent: Patent attorney Noriyuki Chika (and one other person)

Claims (1)

[Claims] In a cold welding method for a pair of welded objects having a difference in plate thickness or deformation resistance, at least one of the objects to be welded under pressure or one welded object having a smaller deformation resistance is The method includes a step of forming a protrusion at a portion to be welded by pressure, and a step of overlapping the pair of objects to be welded and performing cold welding. A cold pressure welding method that is characterized by joining objects.