JPS63137535A - Manufacture of grooved metal bar - Google Patents

Abstract

PURPOSE:To obtain at low cost a grooved metal bar of high accuracy without any strain by forming the range performing a grooving in a thin part and rolling the thin part by using a roll having a projecting bar thereafter. CONSTITUTION:A thinner part 1B is formed by rolling or cutting the range performing a grooving in the longitudinal direction of a metal bar 1 and an annealing and buffing are executed on the metal bar 1 provided with the thinner part 1B thereafter. In succession a rolling is performed once or several times by arranging between the roll 2 with projecting bar having plural projection bars in a rolling stage and a flat roll 3 the thinner part 1B of said metal bar 1 so as to conform to the projection bar part 2A of the roll 2 with projecting bar. At this rolling time the groove lower part 1C performing a grooving by the projection bar of the roll 2 with projecting bar is extruded by the projecting bar, coming into the recessed part between the projecting bar of the roll 2 with projecting bar 2 and the projecting bar. A straightening by a leveler is thereafter performed as the final stage.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a grooved metal strip used for a crimp terminal for connecting coated electric wires such as enamelled wires.

(Prior Art) As shown in FIGS. 5 and 6, currently, as a method for connecting a covered electric wire 5 such as an enameled wire to a crimp terminal 4 or a crimp connector, a narrow groove 4B is provided inside the crimp portion 4A. By providing this groove 4B, the groove 4B digs into the covered electric wire 5 such as an enamelled wire during crimping, and at the same time the covered electric wire 5 and the crimped part 4 are held, the covering such as enamel is broken, and the covered electric wire 5 and the crimped part 4 are held together. The technology of making conduction is known.

Incidentally, FIGS. 5 and 6 are a perspective view and a sectional view of a main part showing the connection state of the conventional crimp terminal 4.

Conventionally, processes for forming the narrow groove portion 1A in the longitudinal direction of the metal strip 1 used in the crimp terminal 4 include a method of plastic deformation using a press, a cutting process using a cutter, a rolling process using a protruding roll, etc. It was done.

(Problems to be Solved by the Invention) When forming grooves as described above, the corners of the grooves are damaged by pressing during press forming, and it is difficult to break the coating such as enamel at the crimped portion during crimping. However, in cutting processing, the groove width is small (1 mm or less), so it is difficult to sharpen the blade, and the processing speed is slow. In the case of
It is not possible to absorb the escape of the material, causing internal distortion in the material, and excessive force is applied to the rolls, making it difficult to process metal strips with high precision.

The object of the present invention is to solve the various problems in processing metal strips as described above, and to manufacture grooved metal strips at low cost and with high precision.

(Means for Solving the Problem) This invention involves a step of cutting or rolling a region in which multiple grooves are to be formed into a thinner part in the longitudinal direction of a metal strip, and then using a roll with convex grooves. The method is characterized by comprising a step of rolling the thin portion.

(Function) That is, in the longitudinal direction of the metal strip, the range in which a plurality of grooves are to be processed is made into a thin wall section in advance, and the convex strips of the plurality of strip rolls are aligned with this thin wall section, thereby forming a metal strip. It absorbs run-off of strips and performs highly accurate groove machining.

(Example) An embodiment of this invention will be described based on the drawings.

FIG. 4 is a diagram showing a state in which a thin wall portion 1B is provided in the longitudinal direction of the metal strip 1. First, as shown in the fourth diagram, the metal strip 1
The range in which grooves are to be processed in the longitudinal direction is made into a thin wall part 1B by rolling or cutting, and
The metal strip 1 on which the metal strip 1 is provided is sintered and covered with cloth. Subsequently, as shown in the first diagram, in the rolling process, a plurality of protrusions are provided in the thin part 1B of the metal strip 1 between the roll 2 with protrusions having a plurality of protrusions and the weekday roll 3. Said convex striped roll 2
2A, and rolling is performed once or several times.

During this rolling, the groove lower part 1G to be grooved by the ridges of the roll 2 with ridges in FIG. 1 is pushed out by the ridges as shown in FIG. Enter the four parts between.

That is, the thin portion of the metal strip is formed in advance by considering the volume of the groove portion 1A in FIG. 4.

Then, as a final step, correction is performed using a leveler.

Note that the groove portion 1A in FIG. 3 indicates a grooved portion of the metal strip 1, and the groove 4B in FIG. 6 is a groove portion when the grooved metal strip 1 is roughly processed and used as a crimp terminal. can be,
The groove lower part 1C in FIG. 1 refers to the part of the metal strip 1 provided with the thin portion 1B that is pushed out by the protrusions of the protrusion roll 2.

(Effects of the Invention) As described above, according to the present invention, by making the range in which the grooves are processed in the longitudinal direction of the metal strip material into a thin wall part, the grooved metal with no distortion and high precision can be produced in the next rolling process. The strips can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are diagrams showing the rolling process in this invention,
FIG. 3 is a perspective view showing the shape of a grooved metal strip, FIG. 4 is a perspective view showing a state in which a thin wall portion is provided in the metal strip material, and FIGS. 5 and 6 are grooved metal made according to the present invention. FIG. 2 is a perspective view and a cross-sectional view of a main part showing a wire connection state of a crimp terminal using a strip. 1...Metal strip, 1A...groove portion, 1B...thin section, ゛1C...groove lower part, 2... ...Roll with protrusions, 2A...Protrusions, 3...Flat roll, 4...Crimp terminal, 4A...・・・Crimp part, 4B・・・Groove, 5・・・・・・Coated electric wire.

Claims (1)

[Claims] A method for processing a metal strip in which a plurality of narrow grooves are provided in the longitudinal direction, comprising the steps of: forming a thin wall portion in advance in the range where the grooves are to be processed in the longitudinal direction of the metal strip; 1. A method for producing a grooved metal strip, comprising the step of rolling within a range with a plurality of convex strip rolls.