JPH0395810A - Manufacture of contact - Google Patents

Abstract

PURPOSE:To eliminate rotation of a dropping contact material in the air to eliminate deformation of the base metal and defective contact calking by forming the tip of the contact material and a planar shape of a matching block in specific shapes respectively to be fitted with each other. CONSTITUTION:A protruding strip 2a and a recessed groove 4a which are engaged with each other are formed on cutter blade faces of a cut die 2 and a punch 4 while a recessed groove 3a and a protruding strip 4b are respectively formed on a surface to be matched with a contact material of a matching block and an opposite face of the punch 4 in contact with the above surface wherein the recessed groove 3a and the protruding strip 2a are aligned with each other. In this constitution, the punch 4 cuts a long contact material 1 which has lowered while the recessed groove 4a and the protruding strip 4b are engaged with the protruding strip 2a and the recessed groove 3a so that the shape of its tip is a protrusion. On the other hand, an matching cut face of a contact material 1a which has been cut and is dropped is a recess. When the cut contact material 1 abuts against a block 3, it is engaged with the recessed groove 3a and when it is cut by the punch 4, the cut contact material 1a is guided by the recessed groove 3a and the protruding strip 2a to be dropped on a base metal 6a without rotating.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for manufacturing contacts used in thermal relays and the like.

[Conventional technology]

FIG. 3 is a schematic side view showing the conventional method, in which 1 is a long contact material with a mushroom-shaped cross section, 2 is a cut die, 3 is an abutment block facing the cut die 2 at a predetermined interval, and 4 is a punch. , 5 is a caulking die, and 6 is a contact base metal placed on the caulking die 6. Although not shown in the drawings, the cut die 2 is divided into upper and lower halves, and a hole having the same outline as the cross-sectional shape of the contact material 2 is formed on the mating surfaces thereof. The contact material 2 is guided through this hole from the left to the right in the figure by a feed mechanism (not shown), and its tip abuts against the abutting block 3. Then, the punch 4 descends along the cut die 2 and cuts off the tip portion 1a of the contact material 1 protruding from the cut die 2. Fourth
The figure shows the contact material 1a that has been cut off.
A) is a front view, and Figure 4 (B) is a side view. As shown in the figure, the cross-sectional shape of the contact material 1a is mushroom-shaped as described above, and the total length shown in FIG. 4(B) is the same as the distance between the cutting die 2 and the abutment block 3. The contact material 1a cut off by the punch 4 falls downward as it is. On the other hand, a contact base metal 6 is placed on the caulking die 5 and has a square hole drilled at the position where the contact material 1a falls. Then, the contact member 1a is received by the base metal 6, and its lower half leg enters into the square hole of the base metal 6. Meanwhile, the punch 4 continues to descend, and when the contact material 1a is received by the base metal 6, it is crushed between it and the caulking die 5 and caulked to the base metal 6.

[Question H that the invention attempts to solve]

In such a conventional method, the contact material 1a that has been cut off by the punch 4 falls and tends to rotate in the air and lose its posture by the time it reaches the base metal 6, and as a result, the legs of the contact material 1a are attached to the corners of the base metal 6. There have been cases where the base metal 6 has been deformed or the contact material 1a has not been sufficiently crimped because the contact material 1a has been crimped without being able to fit into the hole accurately. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a contact that eliminates the phenomenon in which contact material that is cut off by a punch and falls rotates in the air, and that allows the contact material to be reliably caulked to the base metal. be.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention abuts the tip of a long contact material horizontally protruding from a cut die against an abutment block facing the cut die, and a punch that is lowered along the cut die. In the method of manufacturing a contact, the protruding part of the contact material is cut off, the fallen contact material is caught by a base metal on a caulking guid, and the contact material is caulked to the base metal with the punch that continues to descend. The contact material is cut so that the planar shape of the tip thereof is convex or concave, and the planar shape of the abutting block against which the tip of the contact material is abutted is a concave or convex shape that fits into the convex or concave shape. That is.

[For use]

The convex or concave shape of the tip of the contact material cut off by the punch falls while being guided by the concave or convex shape of the abutment block, so that it does not rotate in the air and lose its posture.

【Example】

FIG. 1(A) is a plan view showing an embodiment of the present invention, FIG. 1(B) is a side view thereof, FIG. 2(A) is a plan view of a contact material cut off from a long contact material, FIG. 2(B) is a side view thereof, and FIG. 2(C) is a front view thereof. Note that parts that are the same as or correspond to those in the conventional example are given the same reference numerals. In FIG. 1, the cutting surfaces of the cutting die 2 and the punch 4 are formed with protrusions 2a and grooves 4a that engage with each other, and the contact material abutment surface of the abutment block 3 and the opposing surface of the punch 4 in contact with this are formed. Each has a concave ridge 3a and a convex ridge 4b. Here, the concave groove 3a of the abutment block 3 is aligned with the protrusion 2a of the cut die 3. The other structures are the same as in the case of FIG. In the illustrated structure of the cut die 2, the abutment block 3, and the punch 4, the punch 4 is lowered as the concave groove 4a and the convex line 4b engage with the convex line 2a of the cut die and the concave groove 3a of the abutment block 3, and the elongated contact point is formed. The material 1 is cut so that the planar shape of the tip is convex. On the other hand, the mating cut surface of the contact material 1a that is cut and falls has a concave shape as shown in FIG. 2(A). When the contact material 1 whose tip is cut into a convex shape is abutted against the abutting block 3, it fits into the groove 3a. When the contact material 1 is cut with the punch 4 in this state, the protrusions and recesses at the front and rear ends of the cut-off contact material 1a are guided by the groove 3a of the abutment block 3 and the protrusion 2a of the cutting die 2, respectively. , it falls onto the base metal 6 without rotating. Therefore, the legs of the contact material 1a accurately fit into the square holes (not shown) of the base metal 6, and subsequent caulking is performed correctly. In the illustrated embodiment, the long contact material l has a convex cut surface, but the uneven relationship of the cut die 2, abutment block 3, and punch 4 is reversed to that shown in the figure, and the long contact material l is cut in a convex shape. The cut surface of the contact material l may be made concave.

【Effect of the invention】

According to this invention, since the contact material separated from the long contact material does not rotate and lose its posture before reaching the base metal, the subsequent caulking work is performed stably, and the deformation of the platinum and the contact Eliminates caulking defects.

[Brief explanation of drawings]

FIG. 1(A) is a schematic plan view showing an embodiment of the present invention, FIG. 1(B) is a side view thereof, and FIG. 2(A) is a schematic plan view showing an embodiment of the present invention. 2(B) is a side view thereof, FIG. 2(C) is a front view thereof, FIG. 3 is a side view showing a conventional example, and FIG. 4(A) is a conventional example. FIG. 4(B) is a front view of a contact material cut off from a long contact material, and FIG. 4(B) is a side view thereof.

Claims (1)

[Claims] 1) The tip of a long contact material that protrudes horizontally from a cut die is brought into contact with an abutment block that faces the cut die, and the protruding portion of the contact material is cut off with a punch that is lowered along the cut die, and the contact material is dropped. In the method for manufacturing a contact, the contact material is received by a base metal on a swaging die, and the contact material is crimped onto the base metal by the punch that continues to descend. A method for manufacturing a contact, characterized in that the contact block is cut into a concave shape and the planar shape of the abutting block against which the tip of the contact material is abutted is a concave or convex shape that fits into the convex or concave shape. .