WO2007129781A1

WO2007129781A1 - Processing method for link of automobile door-lock

Info

Publication number: WO2007129781A1
Application number: PCT/KR2006/002031
Authority: WO
Inventors: Kyu-Tae Kim
Original assignee: Shinhwatech. Co., Ltd.
Priority date: 2006-05-08
Filing date: 2006-05-27
Publication date: 2007-11-15
Also published as: KR100653459B1

Abstract

The present invention relates to a forming method of a link formed integrally with a locking portion at the front end of a wire, and it comprises a swaging step (FFSW, FDSW) of com- pressively forming the wire in such a manner that its diameter is small by applying pressure ont the outer peripheral surface of the remaining wire except an one end of the wire formed with a locking portion, a bending step (FFB, PBD) of bending the compressively forming wire, an expanding step (PFEP) of forming the locking portion in a plate shape, and a piercing and trimming step of forming a locking hole at the locking portion formed in the plate shape by means of piercing (FFP, FDP, PPPC), and formularizing the outer peripheral surface of the locking portion concurrently by means of trimming (FDT, PPT), so that it is possible to remove the loss of raw materials, remove the necessity of inefficient work such as a welding process by performing the plastic work of the wire made of single material to form the link. Also, it is possible to improve the productivity by simplifying the process of plastic work, and to provide structurally stronger link than before.

Description

PROCESSING METHOD FOR LINK OF AUTOMOBILE DOOR- LOCK

Technical Field

[1] The present invention relates to a forming method of a link for an automobile door- lock, more particularly, to a forming method of a link for an automobile door- lock, which can improve the productivity and provide the link of improved quality by simplifying the manufacturing process in the integral formation of a locking portion at the front end of the link used in the automobile door-lock.

[2]

Background Art

[3] In general, several types of power transmission devices have been used in several machines and devices including the automobiles, and a link work (hereinafter, it is called "a link") among them is usually used as power transmission means for transferring the rotation movement or reciprocal movement of relatively small torque. Hereinafter, a link used in the automobile door- lock will be described in detail below with reference to FIG. 1.

[4] The automobile door-lock shown in FIG. 1 is constructed that a door- lock and a key box are separately arranged differently from the general locking device, because it is mounted to the inside of a door for the automobile, that is, it is mounted to a predetermined position in the limited space, and the door-lock is opened and closed after receiving the rotation force produced in the key box by means of the link.

[5] Also, in case of the link for the automobile door-lock, the link is formed by bending a wire of desired thickness to conform to the limited space inside of the automobile door-lock. In this regard, one side of the link is jointed to the key box to be transferred of the rotation force, and the other side thereof is formed with a locking portion having a locking hole to engage with an operation portion of the door- lock. Accordingly, with regard to the link, the thickness and size of the joint hole together with the thickness of the wire are strictly standardized according to the specification of the door-lock loaded to the respective automobile.

[6] Meanwhile, according to a conventional method for forming the link for the standardized door-lock, the link was formed through a curling step (PFCL), an expanding step (PFEP), a bending step (FFB, PBD) and a piercing step (FFP, FDP, PPPC) according to one embodiment, or it was processed through a blanking step (PP, PPF), an embossing step (PFEM), a bending step (FFB, PBD) and a welding step according to another embodiment. Hereinafter, the conventional forming method of the link for the door-lock will be described in detail.

[7] At first, according to one embodiment of the conventional forming method of the link for the door-lock as shown in FIGs. 2 and 3, the link 110 for the door-lock was formed by performing a curling step (PFCL) for bending wire 115 several times so that a locking portion 120 with a locking hole 125 is formed at one end of the wire 115 having a predetermined thickness, an expanding step (PFEP) for forming the locking portion 120 of the wire 115 produced through the curling step into a plate shape of a predetermined thickness, a bending step (FFB, PBD) for bending the other end of the wire 115 formed with the locking portion 120 based on the standard, a piercing step (FFP, FDP, PPPC) for enlarging the size of the locking hole 125 formed at the locking portion 120 to conform to the standard.

[8] However, according to the formation method of the link for the door-lock of the conventional embodiment as described above, the work process is complex and difficult because the wire 115 should be bent several times in the initial curling step, and the labor loss was great to thereby reduce the productivity. Meanwhile, there occurred a structural defect that one side of the locking portion 120 formed with the locking hole 125 was sheared. It was a serious problem in consideration of the situation that most of the recent automobile door-lock employs an automatic (motor driving type) door- lock producing bigger torque in comparison with the manual type door-lock.

[9] Furthermore, according to another embodiment of the conventional forming method of the link for the door-lock with reference to FIGs. 4 through 6, the link for the door- lock was formed through a blanking step (PPB, PPF) of forming a separate locking portion 220 formed with a locking hole 225 by press punching a steel sheet, an embossing step (PFEM) of forming a welding projection 227 on the locking portion 220 to facilitate the welding by concentrating the resistance in the electric resistance welding of the wire to be described below on the locking portion 220, a bending step (FFB, PBD) of bending the wire 215 of a predetermined thickness into a predetermined shape, and a welding step of performing the electric resistance welding of the bent wire 215 on the welding projection 227 formed on the locking portion 220.

[10] However, according to another formation method of the link for the automobile door-lock of the conventional embodiment as described above, a lot of scraps were produced in addition to the formation of the locking portion 220 because the steel sheet was subjected to the blanking step to thereby produce substantial loss of the raw material, although it didn't require the curling step. Also, the electric resistance welding performed in the method was low in productivity in comparison with a plastic process by means of a press machine, the welding badness could be frequently produced between the wire 215 and the locking portion 220, and inspection work for preventing the bad products from being taken of the warehouse was difficult. [H]

Disclosure of Invention Technical Problem

[12] Therefore, the present invention has been made to solve the problems occurring in the conventional arts, and it is an object of the present invention to provide a forming method of a link for an automobile door-lock, which can reduce the loss of raw materials, remove the necessity of inefficient work such as a welding process by performing the plastic work of the wire made of single material to form the link, improve the productivity by simplifying the process of plastic work, and provide structurally stronger link than before. In this regard, the link forming method comprises a swaging step (or upsetting step), a bending step, an expanding step, and a piercing and trimming step.

[13]

Technical Solution

[14] To solve the above object, according to the present invention, there is provided a forming method of a link for an automobile door- lock, comprising a swaging step (FFSW, FDSW) of compressively forming the wire in such a manner that its diameter is small by applying pressure onto the outer peripheral surface of the remaining wire except an one end of the wire formed with a locking portion, a bending step (FFB, PBD) of bending the compressively forming wire, an expanding step (PFEP) of forming the locking portion in a plate shape, and a piercing and trimming step of forming a locking hole at the locking portion formed in the plate shape by means of piercing (FFP, FDP, PPPC), and formularizing the outer peripheral surface of the locking portion concurrently by means of trimming (FDT, PPT).

[15]

Advantageous Effects

[16] Therefore, according to the forming method of a link for an automobile door-lock of the present invention, it is possible to remove the loss of raw materials, remove the necessity of inefficient work such as a welding process by performing the plastic work of the wire made of single material to form the link. Also, it is possible to improve the productivity by simplifying the process of plastic work, and to provide structurally stronger link than before.

[17]

Brief Description of the Drawings

[18] FIG. 1 is a perspective view showing a general automobile door- lock;

[19] FIGs. 2 and 3 are process diagrams showing one embodiment of a conventional forming method of a link for an automobile door- lock;

[20] FIGs. 4 through 6 are process diagrams showing another embodiment of the conventional forming method of a link for an automobile door-lock; and

[21] FIGs. 7 and 8 are process diagrams showing a forming method of a link for an automobile door-lock according to the present invention.

[22]

Mode for the Invention

[23] Hereinafter, the forming method of a link for the automobile door- lock according to the present invention will be explained in detail with reference to the appended FIGs. 7 and 8 below.

[24] In the formation method of a link for an automobile door- lock according to the present invention, a swaging step, which is the first step, is a process of compressively forming a wire 15 in such a manner that its diameter is small by applying pressure onto the remaining outer peripheral surface of the wire except the one end formed with a locking portion 20 in the step of applying the pressure onto the outer peripheral surface of the wire of predetermined thickness, and a bending step following the swaging step is to bend the remaining portion, which has been compressively formed, except the locking portion formed on the wire 115, into a predetermined shape.

[25] Also, an expanding step following the bending step is to form the locking portion

20 of the wire 15 into a plate shape of a desired thickness conforming to the required standard, and a following piercing and trimming step is to form a locking hole 25 of a size conforming to the standard at the locking portion 20, and to accomplish the link 10 by formularizing the outer peripheral surface of the locking portion 20 to conform to the standard concurrently.

[26] Meanwhile, it is preferable that the initial step in the present invention as described above is constructed of the swaging step (FFSW, FDSW), an upsetting step can be performed in place of the swaging step in another embodiment of the present invention to thereby obtain the object of the present invention. In this regard, the upsetting step (FFU, FDU, FCU) is to extend the diameter of the one side of the locking portion by pressurizing the wire in the axial direction so that the locking portion can be formed at one end of the wire of the thickness conforming to the standard, although not shown in the drawing. Also, the bending step in the present invention can be performed after the expanding step or the piercing and trimming step.

[27]

Industrial Applicability

[28] As described above, with regard to the effect and action of the forming method of the link for an automobile door-lock as described above, it is possible to simplify the process in comparison with the conventional curling step of the wire by forming the locking portion 20 on one end of the wire 15 by means of the swaging step, and to remove the loss of raw materials differently from a blanking process forming the locking portion separately. Furthermore, it is possible to produce stronger link structurally in comparison with the link formed with separate locking portion by welding, or the link extinct of the locking portion, because the locking portion 20 of the link 10 can be integrally formed at the wire 15 without the extinct of the locking portion 20 of the link 10. [29]

Claims

[1] A forming method of a link for an automobile door-lock, comprising: a swaging step of compressively forming the wire in such a manner that its diameter is small by applying pressure onto the outer peripheral surface of the remaining wire except an one end of the wire formed with a locking portion; a bending step of bending the compressively formed wire; an expanding step of forming the locking portion in a plate shape; and a piercing and trimming step of forming a locking hole at the locking portion formed in the plate shape, and formularizing the outer peripheral surface of the locking portion concurrently.

[2] A forming method of a link for an automobile door-lock, comprising: an upsetting step of extending one side diameter of a wire formed with a locking portion by pressurizing the wire in the axial direction; a bending step of bending the pressurized wire; an expanding step of forming the locking portion in a plate shape; and a piercing and trimming step of forming a locking hole at the locking portion formed in the plate shape, and formularizing the outer peripheral surface of the locking portion concurrently.