JPS58102419A - Method of producing small switch opposite contact - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a small switch facing contact section, in which two copper or copper alloy strips coated only on the negative side with a contact material are translated, and their tips are sheared to a required length. The main feature is that the composite material is caulked at opposing positions.

The present inventor is the founder of a contact mass production system using all press processing. In JP-B No. 5B-31534, ``Method for manufacturing electrical contacts by press working,'' and JP-B No. 56-891, ``Method for manufacturing microswitches,'' copper alloy plates used as contact bases are
Punch out a shaped hole, feed a strip of contact material such as silver over the hole, fill the hole with the punched strip of the same shape as the hole, swage it, and pull out the middle part of the swaged contact material. We are proposing a method of shaving the bidirectional cross section to form the opposing contact surface.

The above method was a great leap forward from conventional technology in terms of both quality and efficiency as a manufacturing method for opposing contacts, but compared to the general contacts using clad contact material developed by the present inventor,
The disadvantage was that a large amount of contact materials such as silver were used. but,
Unlike general contacts, opposed contacts are rounded with two contacts facing each other, and cannot be crimped to the composite material by press working. Therefore, it was considered impossible to use clad contact material for opposing contacts.

This invention solved the above difficult problem, and was successful in overturning the conventional wisdom that the direction of pressure was always perpendicular to the contact surface when caulking the clad contact material to the base material. Although it is impossible to introduce a cladding material into the opposing contact according to the above common sense, in this invention it was decided to caulk the contact material into the composite material using a pressing force parallel to the contact surface.

However, there was a problem in that the direction of the pressurizing force was such that the clad contact material, which was simply a bonding of dissimilar gold SITs, was likely to peel off. However, when pressurizing the contact material,
This pressurizing force generates a compressive force that presses the bonded surfaces of the SHIFRAD materials together, thereby eliminating the possibility of peeling.

However, the coating of the copper alloy base material with the contact material is not limited to the cladding method, and plating may also be used. but,
The cladding is superior in terms of durability and reliability.

Next, the configuration and embodiments of the present invention will be described with reference to the drawings. As is well known, the opposed contact has a movable double-sided contact in the middle, and the electric circuit is switched depending on which of the opposed contacts the double-sided contact contacts.

FIG. 17 shows an example of opposing contacts/, l of a snap switch.

FIGS. 1 to 10 are explanatory diagrams showing each step of an embodiment of this invention. Figure 1.2 shows a state in which a copper alloy strip serving as a contact base is sent to a press machine (not shown), and opposing contact mounting holes are punched out at the required positions. Drunken hole,
The opposing contact gap portion B between the contacts A has also fallen off all at once. Gap portion Bt-\opposing contact/, / may be attached without falling off, and finally falling off together with other unnecessary parts of the copper alloy plate. Since the processing process is almost the same in any case, the explanation will be given by referring to an example of the cause of death, which is suitable for a gold-clad contact for weak current use.

Figure 3.4 shows the state in which the holes and the upper and lower edges of the rim, including the gap B, have been removed by pressing the surface and the 9 (side edge) 'fr.

Figure 5.6 shows only one side of the contact material (silver, copper alloy, gold, etc.)/
Copper or copper alloy strip coated with 8 1. Translate the two strips toward the parallel guide section above the strip plate, which regulates the opposing inner covering surfaces to maintain the gap between the opposing contacts, and place the tips of both strips 16 into the mounting holes, and the vertical guide directly above A. At section 4α, the lower blade 3 at the tip of the parallel guide part and the upper blade 6 with a spacing material 6cL for preventing contact gap reduction are sheared to the required length, and the upper blade 6 is used to shear the bifurcated piece /Z. The state is shown in which it has been pressed down into the mounting hole A and temporarily crimped. Temporary caulking means lightly compressing it, expanding it slightly in the lateral direction, and temporarily fixing it to the inner wall of the mounting hole.For this purpose, a pedestal 7 is placed under the copper alloy plate.

Fig. 7.8 shows the state in which the double shot piece / is finally swaged in the next step and its upper and lower edges are pushed out to the chamfered portion. t and 9 are upper and lower molds for main caulking, and the left and right sheaths S are integrated with a pilot spacing member ta for preventing contact gap reduction, similar to the above-mentioned upper blade 6.

Then, the spacing material AcL, t of the upper blade 6 and the upper die S (L stands for polyfluoroethylene resin (for example, trade name Teflon) 1
0 is pasted on both sides to prevent damage to the surface of the contact material lα of the sheared piece/m 2 .

In this embodiment, as shown in Fig. 6, the thickness of the strip 18 is larger than that of the copper alloy plate, and it protrudes upward and downward accordingly, so one caulking is performed as shown in Fig. 7.8. Then, the protruding portion spreads to the chamfered portions 3 on the upper and lower edges of the mounting hole 9, so that it can be fixed without protruding to both sides of the copper alloy plate.

However, as shown in Fig. 3.4, the mounting hole A was not chamfered 3, and when it was swaged, the upper and lower edges of the sheared piece /2 expanded and the mounting hole A
The upper and lower edges of - may be suppressed.

Sheared pieces compressed in the vertical direction during temporary crimping and final crimping 1. tries to spread in all directions, but three sides are surrounded by the hole walls of the mounting hole, and the remaining side is surrounded by spacing members 4a and ta. Therefore, the side surfaces of the sheared pieces /, even in areas where there was initially some play, are brought into perfect contact with the hole wall and the spacing member, and a compressive force is applied to the mating surfaces of the cladding materials to prevent them from peeling off. Also, the gap between opposing contacts can be secured. Further, the upper and lower edges of the mounting hole A, which are not restrained by the hole wall, are free to spread out and, like the rivet head, grip the mounting hole edge 1 to form a crimp contact that cannot be removed.

Figure 9.10 shows the state in which the unnecessary portion of the strip plate is finally removed and finished after the main caulking shown in Figure 7.8. l/ is the upper die for punching, and the part that hits the surface of the contact material IcL is made to escape so as not to damage it. l is the same type as below. This completes the facing contact l as shown in FIG. 17.

FIG. 11 is a perspective view showing the state just before the state shown in FIG. From above, the upper blade 6.6 descends together with the spacer 65 and is about to shear.

Fig. 12 shows the bridge tool actually used, which is partially shown in Fig. 11, and the parallel guide part DA for the strip lII has the guide material shown in Fig. 14 in the cutting gap, and the shearing lower blade combined tool/3t. - Formed by fitting.

Figure 13 shows the entire punch shown in Figures 5.6.11 with the upper blade 6 and the pilot spacer 6α. Contact material 15 is 17-J~0.3cm thick q or mug
The latter is a Cm square strip clad with Mu as a contact material 18, and the coating thickness of the Mu is often about 1 μm.

FIG. 18 is an example in which the present invention is applied to punching and forming a fixed conductor portion of a snap switch, and shows a state in which a copper alloy strip plate is sequentially processed at each processing position. The strip is fed into a high-speed automatic press equipped with a compound slow-release type, and in this case,
The molding and punching process is completed by a human process that includes a play process.

To explain only the parts to which this invention is applied, in the first step, as in FIG. 1, contact mounting holes M and M are punched out together with the gap B. Second
In the process, PT- is performed on the upper and lower edge surfaces of the hole. The fifth step corresponds to the above-mentioned Fig. 5.6.11, in which shearing of the tip of the translated strip 11117 and temporary crimping of the fragment into the attachment hole are performed all at once. In the fourth step, fragment l is permanently caulked. In the fifth step, the unnecessary inner part of the strip plate and the part adjacent to the contact gap part B are also punched out. This completes the opposing contacts /, /.

In the 6th step, there is play, and in the 7th step, all the fixed conductors of the snap switch are fixed by the outer plate /! ! , tip tie material 1
Some of the ones marked 6 were slightly connected and punched out, and the 8th. Use T and @ to remove it from the strip.

Next, we will add an explanation of the case where only the contact mounting holes M and M are punched out in the first step, and the gap part B falls out together with other unnecessary parts at the end. In this case, the copper alloy material in the gap portion B remains until the end and functions as a spacing material for preventing contact gap reduction. Therefore, the spacing material 4a of the upper blade 6 and the spacing material la of the upper die t in the previous embodiment become unnecessary.

As a spacing material used only during shearing by the upper blade 1, it is possible to extend the spacing regulating material of the parallel guide part to the vertical guide part 4La, but this is omitted as the possibility of the cladding material peeling off due to shearing is relatively small. You may.

In this case, the sheared piece that is inserted into both mounting holes along the straight guide part by the shearing upper blades on both sides and temporarily and permanently swaged is surrounded by the mounting hole wall on its entire circumference, so it cannot be machined from above. The pressure also creates a lateral compressive force, which acts to prevent delamination of the cladding material. Generally, the copper alloy base material is stronger than the clad contact material, so even if the contact material is crushed by caulking, the copper alloy side will not deform and will hold the contact material and prevent peeling. To prevent.

Note that the wall surface of the hole, which serves as the spacer material into which the contact hole is pushed, should be smoothed by shaving after punching the hole, so as not to damage the contact surface.

Although the present invention has been described above with reference to a small number of embodiments, it goes without saying that the present invention can be varied and applied in various ways according to techniques well known to art engineers without changing its gist. If the shape of the contact mount is scalene hexagonal as shown in Figure 1, the crimp will be more reliable than if it were a rectangular hole, but this does not mean that rectangular or trapezoidal holes cannot be used.

As shown in Figure 5.6, use a strip with a thickness that takes into account the caulking allowance in advance, as well as a strip with the same thickness as the copper alloy sheet.

A crimping method may be used in which a wedge material or other material is pushed into the upper and lower edges of the sheared piece /I and spread laterally during the main crimping. The upper blade and the side surface of the spacing member of the upper die that touch the coated surfaces of both strips may be polished to prevent resin from sticking.

This invention can be applied even to a contact base material with a complete contact gap from the beginning, as long as a notch is made at the opposite position to serve as a contact mounting hole, and measures are taken to prevent the base material from moving due to crimping pressure. .

This invention overturns the conventional wisdom that it is impossible to manufacture opposing contacts by a pressure bonding method other than the method of manufacturing opposing contacts by pressing, which the present inventor previously developed.

Moreover, the inventive feature is that a strip coated with contact material on one side is divided and crimped to form opposing contacts, which reduces the utilization of the conventional method in which only both ends of pieces punched out from expensive contact material plates serve as contacts. This makes it possible to use 100% more contact material than other materials.

We have developed a new method of crimping the clad contact material to the composite material using pressure parallel to the contact surface, but when applying pressure, we can press the bonding surface by using a spacing material to prevent the gap between the opposing contacts from shrinking. By creating a combined compressive force, the most troublesome phenomenon of peeling of the C-clad material could be avoided.

[Brief explanation of drawings]

Figure 1.2 is a plan view and elevation (cross-sectional) view for explaining the first step of an embodiment of this invention, Figure TS3.4, Figure 15.6, Figure 7.
．． Figures 8 and 9 and 10 are a plan view and an elevation view for explaining the process, Figure 11 is a perspective explanatory view of the process in Figure 5 and 6, and Figure 12 is a bridge tool with parallel and perpendicular guide parts. ,Perspective view,
Figures 13 and 14 are box views of the upper and lower shearing blades;
= Figure 16 is a perspective view of two embodiments of a contact strip, Figure 17 is a perspective view of an example of a completed opposed contact part, and Figure 18 is a case where the present invention is applied to press forming and punching of a fixed conductor part of a snap switch. It is a plan explanatory diagram. /a... Strip, Co... Copper alloy strip, Th... Parallel guide section, Daα... Vertical guide section, 6α, troL...
- Spacing material to prevent contact gap reduction. Figure 1 Figure 2 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] Transfer the copper alloy strip plate to a press machine, punch out opposing contact mounting holes at the required positions, and insert two copper or steel alloy strips whose negative sides are coated with contact material so that the opposing inner coating surfaces cover the gap between the opposing contacts. The tips of both strips are cut to a required length by the vertical guide directly above the mounting hole, and the two-sided strip is inserted into the numbered hole above. A small switch characterized in that the above-mentioned spacing material for preventing contact gap reduction is interposed from beginning to end during the pressing down, temporary crimping, and un-crimping in the next process, and finally, unnecessary portions of the band plate are removed and finished. Manufacturing method of opposing contact part.