JPH11283722A - Crimp terminal rod and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten an yield rate without cracking and breaking at the time of crimping. SOLUTION: This crimp terminal rod is, from a single material A, integrally composed of a rod-shaped inserting part to electric equipment, and a tubular connecting part electrically and mechanically connecting with an electric wire by crimping from the outside with a core wire portion of the electric wire being inserted into it. Here, the single material A is punched out from a metal band material so as to have proper volume, and the tubular connecting part is formed into the tubular shape by axially boring a hole B10 into a solid columnar part B1 formed out of the prescribed portion of the single material A in a forging process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical connection for electrically and mechanically connecting a rod-shaped insertion part to an electric device and an electric wire by crimping from outside with a core portion of the electric wire inserted. The present invention relates to a bar-type crimp terminal that is integrally formed from a single material.

[0002]

2. Description of the Related Art 0.75 mm ^{2 is used for} various types of electric equipment, such as an IV electric wire or a VVF cable, which is supposed to connect a single core wire of 1.6φ or 2.0φ as a power supply line.
When connecting a multi-core electric wire generally called a cord such as 1.25 mm ² or 1.25 mm ² , the connection may be difficult because the core wire is too soft. In such a case, the connection is performed via the rod-type crimp terminal 1 in which the rod-shaped insertion portion 10 and the cylindrical connection portion 11 are integrally formed as shown in FIG.

That is, the core wire portion 21 of the multi-core electric wire 2 called a cord, which is peeled off and exposed, is inserted into the cylindrical connection portion 11 of the bar-type crimp terminal 1 and crimped from the outside. After performing the electrical and mechanical connection between the multi-core electric wire 2 and the rod-type crimp terminal 1 to obtain the state shown in FIG.
The rod-shaped insertion portion 10 is connected to, for example, a power supply line connection portion of an electric device that is supposed to be connected to a single core wire.

Japanese Utility Model Application Laid-Open No. 61-60474 discloses a bar-type crimp terminal as described above. According to Japanese Utility Model Application Laid-Open No. 61-60474, the initial rod-type crimping terminal 1 is made of a strip-shaped metal material made of copper or a copper alloy, and a rod-shaped insertion portion 10 and a cylindrical connection portion 1.
1 and cut out into two-step widths corresponding to the required circumference, then both the width portions are simultaneously or separately curled, and finally the abutting or extremely close edges 11a of the cylindrical connecting portions 11 are separated. It was brazed and joined as shown in FIG.

However, in the case of the bar-type crimp terminal 1 manufactured through the above-described steps, the number of manufacturing steps is large, and in particular, the time and labor required for brazing work are low and the production cost is high. As a result, there is a disadvantage that the brazing portion is torn or cracked at the time of press bonding, the occurrence rate of defective products is high, and the yield is poor.

Therefore, the inventor of the invention described in Japanese Utility Model Application Laid-Open No. 61-60474 discloses the following rod-shaped crimping apparatus that can drastically change the material used and the processing means to reduce the cost and improve the yield. Terminal 1 is proposed. In other words, a process of cutting a solid rod-shaped material of a required length from a wire rod and a cold forging process, which is an easy-to-automate cold forging process, which is a hetting process, are performed on the solid rod-shaped material to obtain a material having a predetermined shape. In addition to eliminating the need for brazing, production efficiency can be significantly increased, and there is no material loss in the manufacturing process, and a uniform cylindrical connection that receives a large force during crimping. The rod-type crimp terminal 1 shown in FIG. 4 can be formed without any risk of tearing or breaking at the time of crimping and significantly improving the product yield.

[0007]

However, in the above-mentioned bar-type crimp terminal, a step of cutting into a two-step width corresponding to a required circumference or a step of cutting into a solid rod-shaped material of a required length, that is, In the first process, a single material for one bar-type crimp terminal is converted into individual parts that are separated separately, so a special transfer device is required to sequentially transfer the single material to the next process. However, there is a problem that the cost increases.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to prevent the cylindrical connecting portion from being cracked or broken at the time of crimping of the cylindrical connecting portion, to provide a good product yield, It is an object of the present invention to provide an inexpensive and excellent rod-type crimp terminal capable of sequentially transferring a single material for one mold crimp terminal to the next step without using a special transfer device, and a method of manufacturing the same.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to the first aspect of the present invention, in which a rod-shaped insertion portion into an electric device and a core portion of an electric wire are inserted. And a cylindrical connection portion for electrically and mechanically connecting the electric wire and the wire by external crimping, and a rod-shaped crimp terminal integrally formed from a single material, wherein the single material is a band-shaped crimp terminal. The cylindrical connecting portion is punched out from a metal material so as to have an appropriate volume, and the cylindrical connecting portion has a hole formed along a shaft thereof in a solid cylindrical portion formed by forging a predetermined portion of the single material. Is formed into a cylindrical shape by drilling.

According to the second aspect of the present invention, the rod-shaped insertion portion into the electric device and the core portion of the electric wire are inserted, and the electric wire is electrically and mechanically connected to the electric wire by crimping from the outside. A method for manufacturing a rod-type crimp terminal, comprising a tubular connecting portion and a single material integrally formed, and a punching step of punching an appropriate volume of a single material from a band-shaped metal material, and a stamping step. A forging process in which a predetermined portion of a single material is plastically deformed into a solid cylindrical portion to form an intermediate processed material, and a solid cylindrical portion of the intermediate processed material obtained through the forging process is attached along its axis. And a drilling step of forming a cylindrical connection portion by drilling a hole.

According to the third aspect of the present invention, the electric wire is electrically and mechanically connected to the electric device by crimping from outside with the rod-shaped insertion portion and the core portion of the electric wire inserted. A method for manufacturing a rod-type crimp terminal in which a cylindrical connecting portion and a single material are integrally formed, and a punching step of continuously punching a single material having an appropriate volume with a root margin from a band-shaped metal material. And a twisting process of twisting the continuous single material obtained through the punching process in a direction suitable for the forging process at the base margin, and a solid portion of the continuous single material obtained through the twisting process as a solid Forging process of forming an intermediate processed material by plastically deforming into a cylindrical portion, and drilling a hole along the axis in a solid cylindrical portion of a continuous intermediate processed material obtained through the forging process. Bend the intermediate work material at the base for the drilling process A bending process, and a drilling process of forming a cylindrical connecting portion by drilling a hole along a shaft thereof in a solid cylindrical portion of the intermediate processed material obtained through the bending process. It is a manufacturing method characterized by comprising:

According to a fourth aspect of the present invention, in the manufacturing method, the twisting angle in the twisting step is 90 degrees, and the bending angle in the bending step is 90 degrees.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a crimp terminal according to the present invention; FIG. FIG. 1 is a perspective view illustrating a method for manufacturing a rod-type crimp terminal, and FIG. 2 is a perspective view illustrating the rod-type crimp terminal.

The bar-type crimp terminal according to the present invention is manufactured by the procedure shown in FIG. In other words, while continuously feeding the copper or copper alloy strip metal material sequentially and continuously
First, an extra portion is cut off by continuous press punching, and one longitudinal side of the strip-shaped metal material is left as a joint margin P, and is connected to the joint margin P with a root margin Q as shown in FIG. Processing is performed so as to leave a single material A. Single material A comprises a prism portion A ₁ and the wide portion A _2.
Prism portion A ₁ is finally part to be molded into a rod shape insertion portion 10 of the cylinder, one side is a substantially square sectional bar with a plate thickness of the substantially strip-shaped metal material. Wide portion A ₂ is finally part to be molded to the tubular connection portion 11, which can be finished in solid cylindrical shape portion in the same outer diameter as just cylindrical connecting portion 11 in the forging process of the post-process volume Has been.

[0015] cut as shown in FIGS. 1 (a) processed single material A, as shown in FIG. 1 (b), in a state of being moved as parallel, the prism portion A ₁ in the cylindrical portion A ₃ And the tip is tapered and plastically processed. The single material A plastically processed as shown in FIG. 1B is twisted clockwise by 90 degrees at the root margin Q as shown in FIG. 1C. This 90
Every twisting process, as capable of crushing the wide portion A ₂ in the width direction by pressing the forging die in such a state that the front and rear of the processing course material out of the way, with respect to the feed direction of the connecting margin P is a process performed in order to direct the width direction of the wide portion a ₂ in a direction perpendicular Te.

As shown in FIG. 1C, 90
Wide portion A ₂ of degrees twisted single material A is forging die is molded in is crushed by (not shown) in the solid columnar shape portion B _1, the state as shown in FIG. 1 (d) It is formed into an intermediate work material B. In the forging process is molded to the state shown in FIG. 1 (d) an intermediate workpiece B is downwardly bent at a right angle at the root margin Q, is in the state shown in FIG. 1 (e), of the cylindrical portion A ₃ The tip points downward. The folding process is, in the state as articulated margin P out of the way, as in available drilled in such real cylindrical portion punched or drilled holes along the axis of the B _1,
Is a process performed in order to direct the medium axis of the real cylindrical portion B ₁ in the direction perpendicular to the plane formed of the connecting margin P.

[0017] solid columnar shape portion B ₁ in bent at a right angle downwardly at the base allowance Q as shown in FIG. 1 (e) 1
(F), the are within bore B ₁₀ is bored penetrating along the axis of the real cylindrical portion B _1, but is connected to a connecting margin P in root margin Q, bar lug The final shape will be completed. 1 (f) through the series of steps (a) to (f) shown in FIG. 1 is sent to the continuous annealing step together with the joint allowance P at, for example, 400 ° C. After annealing for about 2 hours,
After that, it is sent to a continuous plating process together with the joint allowance P, for example, is subjected to tin plating, and then the root allowance Q is finally cut off and separated from the joint allowance P to complete the bar-type crimp terminal 1 as shown in FIG. . It should be noted that the hole P _1, which is formed in the articulated bill P is,
This is a feed pitch hole for sequentially transferring. Further, in the annealing or plating, the root margin Q may be cut and separated from the joint margin P, and may be performed after being separated.

According to the above-described manufacturing method, the intermediate work material B is connected to the belt-shaped joint allowance P with the root allowance Q. Therefore, the intermediate work material B is transferred to each step by transferring the joint allowance P. It is possible to easily transfer them sequentially and sequentially,
A special transporting device for transporting small loose parts is not required, and in the plating process and the like, it is possible to pass the plating solution through the plating solution continuously while being energized, thereby greatly improving the production efficiency.

Further, in the bar-type crimp terminal 1 manufactured by the above-described manufacturing method, the cylindrical connecting portion 11 does not have a joining portion by brazing or the like, and is processed by forging. There is no danger that the core wire such as a cord is inserted into the cylindrical connecting portion 11 and crimped even when the core wire is crimped. The product yield is good and the rod-shaped crimp terminal 1 is inexpensive.
Can be manufactured.

It should be noted that the present invention is not limited to the bar-type crimp terminal of the above-described embodiment, and the twist angle, bending angle, shape of the bar-shaped insertion portion 10 and the like according to the root allowance Q can be appropriately changed. While possible, various modifications are possible within the scope of the claims, and the present invention includes all of these.

[0021]

According to the first aspect of the present invention, the cylindrical connecting portion does not have a portion joined by brazing, and since it is processed by forging, it has stickiness. It is possible to provide an inexpensive rod-type crimp terminal that has good product yield, is inexpensive, and has no risk of tearing or cracking even when it is inserted and crimped into the shape-like connecting portion.

According to the second aspect of the present invention, the cylindrical connecting portion has no portion joined by brazing, and since it is processed by forging, it is sticky, and a core wire such as a cord is connected to the cylindrical connecting portion. There is no danger of tearing or cracking even when inserted and crimped into the part, and an advantageous effect is obtained that it is possible to provide an excellent method of manufacturing a bar-type crimp terminal that has a good product yield and is inexpensive.

According to the third aspect of the present invention, the cylindrical connecting portion has no portion joined by brazing, and since it is processed by forging, it is sticky, and the core wire such as a cord is connected to the cylindrical connecting portion. There is no danger of tearing or cracking even when inserted and crimped, and the product yield is good.Also, by transferring the joint allowance, the intermediate work material can be sequentially transferred to each process, and small There is no need for a special transport device for transporting parts, and in the plating process, etc., it is possible to continuously pass through the plating solution while energizing, making it possible to significantly improve the production efficiency. Since it can be twisted and bent, it is possible to increase the degree of freedom in the arrangement of the processing machine in the forging and drilling processes, and even if the pitch between the front and rear intermediate processed materials is narrow, the front and rear intermediate processed materials can be added. Can so as not to interfere with, inexpensive, an effect that it provides a method for producing superior bar lug.

According to the fourth aspect of the present invention, the twist angle in the twisting step is set to 90 degrees and the bending angle in the bending step is set to 90 degrees. There is an effect that an excellent method of manufacturing a rod-type crimp terminal that can provide a simple and compact arrangement of a processing machine in a forging step or a drilling step can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a method for manufacturing a rod-type crimp terminal according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a rod-type crimp terminal manufactured by the above manufacturing method.

FIG. 3 is a perspective view showing a conventional rod-type crimp terminal.

FIG. 4 is a cross-sectional view showing a state in which a core wire of a cord is inserted into a cylindrical connecting portion of a conventional rod-type crimp terminal and then crimped.

FIG. 5 is a perspective view showing another conventional rod-type crimp terminal.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rod-type crimp terminal 10 Bar-shaped insertion part 11 Cylindrical connection part A Single material A ₂ Predetermined part B Intermediate processing material B ₁ Solid cylindrical part B ₁₀ hole Q Root

Claims (4)

[Claims] 1. A rod-shaped insertion portion for an electric device and a cylindrical connection portion for electrically and mechanically connecting to the electric wire by crimping from the outside with a core portion of the electric wire inserted therein, A bar-type crimp terminal integrally formed from a material, wherein the single material is punched out of a band-shaped metal material so as to have an appropriate volume, and the cylindrical connecting portion is formed of the single material. A rod-shaped crimp terminal characterized in that a predetermined portion is formed into a cylindrical shape by forming a hole along a shaft in a solid cylindrical portion formed by a forging process. 2. A single rod-shaped insertion part to an electric device and a cylindrical connection part electrically and mechanically connected to the electric wire by crimping from outside with a core part of the electric wire being inserted. A method of manufacturing a rod-type crimp terminal integrally formed from a material, comprising: a punching step of punching a single material of an appropriate volume from a band-shaped metal material; and a solid part obtained by the punching step. A forging process in which an intermediate processed material is formed by plastic deformation into a cylindrical portion, and a cylindrical shape is formed by drilling a hole along the axis in a solid cylindrical portion obtained through the forging process. A method for manufacturing a rod-type crimp terminal, comprising: a perforating step of forming a connection portion. 3. A rod-shaped insertion portion to an electric device, and a cylindrical connection portion electrically and mechanically connected to the electric wire by crimping from the outside with a core portion of the electric wire inserted, A method of manufacturing a rod-type crimp terminal integrally formed from a material, comprising: a punching step of continuously punching a single material of an appropriate volume with a base margin from a band-shaped metal material; and a chain obtained through a punching process. By twisting the single material in the bent state in a direction suitable for the forging process at the base margin, and plastically deforming a predetermined part of the continuous single material obtained through the twisting process into a solid cylindrical part A forging process to form an intermediate material,
A bending process in which the intermediate processed material is bent at a root margin in a direction suitable for a drilling process of drilling a hole along a shaft in a solid cylindrical portion in a continuous state obtained through a forging process; And a drilling step of forming a cylindrical connection portion by drilling a hole along the axis of a solid columnar portion of the continuous processed material obtained through the bending process. Manufacturing method of a rod-type crimp terminal. 4. The twist angle in the twisting step is 90 degrees, and the bending angle in the bending step is 90 degrees.
The method for manufacturing a rod-type crimp terminal according to claim 3, wherein: