JPH0626745B2 - Wire processing method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a large curved portion on a wire, and particularly, a curved portion of a required product shape is curved from a shape having a large curvature as shown in FIG. The present invention relates to a wire rod processing method which is effective when the shape changes to a small shape or when a shape having a small curvature changes to a shape having a large curvature.

BACKGROUND ART There is a coil spring forming device as a technique for forming a curved portion on a wire. In this case, as shown in FIG. 2, the wire W sandwiched by the pair of feed rollers 11 and 12 which are rotated in opposite directions to each other is strongly discharged forward through the hole 14 of the wire guide quill 13. Then, the wire rod W is generally formed into a curved shape by pressing the wire rod W into the groove 17 of the forming surface 16 of the forming tool 15 that moves in front of the line guide quill 13 at appropriate times.

In addition, a fixed cored bar 18 which can be adjusted in position but cannot be continuously moved in order to stabilize the curved forming of the wire W may be provided beside the front surface of the hole 14 of the wire guide quill 13, so that the fixed cored bar 18 and the molding can be performed. The processing position of the wire W was fixed by the tool 15 to obtain a stable curved molded product.

In order to continuously change the curved shape, the forming tool 15 is continuously moved in response to the feeding amount of the wire rod, and the contact position with the groove 17 of the forming surface 16 of the forming tool 15 (line guide quill). This is performed by changing the distance from 13 to the contact position of the wire W).

Problems to be Solved by the Invention For example, as shown in FIG. 5, in the case where the required shape is a product having a large diameter to be bent and the bending diameter is partially different in one winding, a wire rod is used in the conventional device. When processed, the wire rod springs back, which makes it difficult to stably form the wire into a desired shape. Specifically, when the curve diameter / wire material diameter = 40 or more, stable molding was difficult.

In the case where there is a large difference between the respective bending diameters during one winding, there is a problem that the desired bending diameter cannot be formed by moving only the forming tool in a timely manner.

Means for Solving the Problem A core bar that collides with a wire rod fed from the wire guide quill between the wire guide quill and the forming tool is attached to the wire rod about the axial center of the wire feed hole of the wire guide quill. It is provided in a structure that can move back and forth continuously or intermittently in response to the feeding amount of the wire rod, and the core metal moves continuously while the molding tool is fixed according to the feeding amount of the wire rod being fed by the pair of feed rollers. Alternatively, by intermittently moving or by continuously moving or intermittently moving both the molding tool and the core metal, the molding tool and the core metal are made to cooperate with each other to continuously adjust the curvature of the desired bending diameter to form the wire rod. It is formed into a curved shape.

Embodiment An embodiment of the present invention will be described with reference to FIG. In this figure, the same parts as in the prior art are indicated by the same numbers.

The cam 21 attached to the pivot 20 rotated by a drive source (not shown) according to a command from the NC device is a fulcrum shaft 2.
A pin 24 is attached to one end of an L-shaped swinging rod 23 that swings around 2
The roller 25 is rotatably attached to the roller 25 so that it can come into contact with the roller 25. The roller contact surface 21a of the cam 21 has a gentle slope. Further, a contact plate 26 is provided on the other end of the L-shaped swing rod 23.
Is attached. The contact plate 26 is provided so as to be able to come into contact with a roller 30 rotatably attached by a pin 29 to a slide 28 which is slidably guided back and forth only in the direction of the line guide quill 13 by a guide guide 27. Then, the roller 30 is constantly pressed against the contact plate 26 by the force of the tension spring 31 provided between the slide 28 and the fixed portion (not shown). Further, a cored bar 32 is fixed to the tip of the slide 28.
A groove 33 for guiding the wire W at a position facing the hole 14 of the wire guide quill 13 is formed at the tip of the. Therefore, the cored bar 32 fixed to the tip of the slide 28 moves back and forth continuously or intermittently with respect to the substantial axis of the line guide quill 13 depending on the contact position between the roller 25 and the contact surface 21a of the cam 21. It is positioned at a predetermined position by the command from.

The present invention has the above-described structure, and the wire W delivered by the pair of feed rollers is delivered to the front surface through the hole 14 of the wire guide quill 13. At that time, the forming tool 15 is moved to the front surface of the wire guide quill 13 by means of a cam or the like (not shown) whose timing is appropriately adjusted by a command from the NC device, and the wire W is formed into a curved shape. At this time, the cam 21 is rotated in synchronization with the movement of the molding tool 15 by a command from the NC device. By the rotation of the cam 21, the L-shaped swing rod 2 is passed through the roller 25 contacting the contact surface 21a.
3 is swung about the fulcrum shaft 22, and the contact plate 26 pushes the roller 30 against the force of the tension spring 31. Therefore, the slide 28 to which the roller 30 is attached is guided by the guide guide 27 and moved back and forth in the direction of the line guide quill 13. Therefore, the mandrel 32 fixed to the tip of the slide 28 is inserted into the groove 33 at the tip of the wire guide quill 13.
The front surface of the wire guide quill 13 can be moved back and forth with respect to the substantial axis of the hole 14 while sandwiching the wire W that is extruded from the molding tool 15 and is in contact with the groove 17 of the molding surface 16 at the intermediate position. Become.

A state in which the wire W is curved is shown in FIGS. 3 and 4. FIG. 3A shows a case where the bending diameter is relatively small, and the wire rod W extruded from the wire guide quill 13 is formed into the forming tool 1.
5 shows a molding state in which 5 and the mandrel 32 are bent. FIG. 3 (B) shows a case where the bending diameter is large, and the cored bar 32 is moved downward (fixing the forming tool 15 at the same position) from the processing state of FIG. 3 (A) to form the wire W into the forming tool. It shows a molding state in which 15 and the cored bar 32 are bent. In this way, by moving the cored bar 32 back and forth with respect to the substantial axis of the hole 14 of the wire guide quill 13, the curved diameter of the wire rod W can be made large or small.

Further, FIG. 4 shows a case where the bending diameter is larger, and not only the cored bar 32 is moved downward from the processing state of FIG. 3 (a), but also the forming tool 15 is moved upward to form the wire W into the forming tool. It shows a molding state in which 15 and the cored bar 32 are bent. In this case, the wire W having a large curved diameter can be processed.

Effect With the conventional method of adjusting the bending diameter of a molded product in which only the molding tool is moved and the core is fixed, the bending diameter can be changed continuously due to the effect of springback when the bending diameter becomes large. It was difficult.

By adopting the method of operating the core metal of the present application to change the bending diameter, it becomes possible to reduce the springback even when the bending diameter is large and obtain the required amount of change in the bending diameter. Even when the core metal 32 is slightly moved, the adjustment of the change can be easily performed even when the difference between the curved diameters that change sequentially during one winding is large.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, FIG. 2 is a structural explanatory view of a conventional technique, and FIG. 3 is an explanatory view of a molding state. (A) is a case where the bending diameter is small (b) is a case where the bending diameter is large Shows the fourth
The figure is an explanatory view of the forming state when the curve diameter is further large, and FIG. 5 is a plan view showing an example of the work after the curve forming process. 13-wire quill 15-molding tool 21-cam 28-slide 32-core bar

 ─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-55-165246 (JP, A) JP-A-59-92136 (JP, A) JP-A-60-130437 (JP, A) JP-A 62- 89540 (JP, A) Japanese Patent Sho 53-39014 (JP, B2) Actual Public 42-21728 (JP, Y1) Actual Public Sho 53-38682 (JP, Y2)

Claims (1)

[Claims] 1. A wire rod fed by a pair of feed rollers through a quill for a wire guide is abutted against a molding surface of a molding tool that advances to the front surface of the quill for a wire guide to change the flow direction of the wire rod. In a wire rod processing method in which a wire rod is plastically deformed to have a large bending diameter and the bending diameter is sequentially changed during one winding, the wire rod and the forming tool face each other between the wire guide quill and the forming tool. A core bar provided at a position for holding the wire rod so as to sandwich the wire rod in the direction of pressing the forming surface of the forming tool in such a positional relationship as described above, in response to the feed amount of the wire rod, The core bar cooperates with a molding tool that can move back and forth while making a forward or backward continuous movement or an intermittent movement at a substantially right angle to the axis and applying a pressure suitable for the curvature of the desired bending diameter. Wire processing method for causing the bending processed into a desired shape.