JPS63303628A - Forming method for s-type flat spiral spring - Google Patents

Abstract

PURPOSE:To enable a spring forming having spring constant close to zero and to improve the performance by fluctuating the relative position of a bending die to a material guide by corresponding to the progress of a spiral winding and executing the spiral winding by adjusting the radius of curvature by a bending die. CONSTITUTION:A bending die 6 is coated on a continuous line 6' and the crossing angle of a guide part 7 and the perpendicular 8' of a winding center 8 is made at theta1 to start the winding of a flat spiral spring 10. The bending die 6 is rotated according to the winding progress of the spiral spring 10 and is located at a dot line 6'' at the winding completion of the spring 10 to make the crossing angle of the perpendicular 8' and guide part 7 to theta2(theta1>theta2).

Description

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

The present invention relates to a method for forming a figure-eight spiral spring of a contact type spiral spring.

``Prior art'' Conventionally, the forming of an S-shaped mainspring spring involves a primary winding step 1 in which the outer end of the spring is turned inside the mainspring and then wound in reverse, as shown in Part 8. The material consists of a secondary winding process 2, with the tension side of the material used in the loading process 1 set to the compression side, the inner end B of the spring being turned inward, and the outer end B of the spring being turned outside to form a normal mainspring shape.夛、That - Entrance process 1 is the 8th
As shown in Figure (C), the spring material 5 is forcibly extruded with a feed flow A/8, and is passed through the material guide 4 and placed on the guide part 7 of the bending die 6 fixed in front of the material guide 4. A forming method is adopted in which the material is brought into contact with the material, bent downward, and wound around a winding center 8 provided midway down between the guide portion 7 and the tip of the material guide 4 in a clockwise manner.

``Problems to be Solved by the Invention'' The S-shaped mainspring spring formed by the above-described conventional method has the following characteristics: - Since the position of the bending die 6 in the entry process 1 is fixed, as shown in FIG. The curvature of each part of the mainspring's entire length after winding has a constant property that it increases from the start of winding to the further it is wound.If the above-mentioned secondary winding process is performed after this next winding, the curvature of the mainspring in its free state as shown in the figure and Nasi,
The torque characteristic based on this curvature is qualitative, showing a clearly positive spring constant, as shown in FIG. 100.

For example, the figure 8 mainspring spring having this quality can be used with a torque T
When a narrow range of torque performance is required, such as the size and quality of the material used to mold the mainspring, it may not be possible to satisfy the spring performance. There is a problem that the spring performance is not satisfactory for reasons based on the following.

It is an object of the present invention to provide a new molding method that overcomes the drawbacks of the conventional means and provides excellent spring performance.

``Means for Solving the Problems'' The present invention, which achieves the above objects, consists of ``a primary winding step in which a spring material extruded from a material guide is brought into contact with a bending die and wound into a spiral winding process; In the method for forming a figure-8 mainspring spring, which includes a secondary winding process in which the spring material is wound in reverse after the process, the relative position of the bending die with respect to the material guide is varied, and the mainspring winding is performed while adjusting the bending radius of the spring material by the bending die. The gist is "a molding method characterized by a primary winding process".

Adjustment of the bending radius by varying the relative positions of the bending dies is achieved by the following means.

・Ni): Refer to FIG. 1 (6), rotate the bending die 6 to change the relative position of the winding center 8 and the material guide 4, and change the bending radius of the spring material 50 by the bending die 6 to 100 windings of the mainspring. Adjust accordingly.

That is, at the beginning of winding the mainspring 10, the bending die 6 is positioned at the solid line DA shown in the figure, and the angle of intersection between the guide part 7 and the perpendicular to the winding center 8 is set to θ, and the winding property of the mainspring 10 is adjusted. At the same time, the bending die 6 is rotated and positioned at the end of the 100th winding of the mainspring, at the dotted line 6' in the figure, so that the intersection angle between the perpendicular line and the guide portion 7 is θz (es>θ).

・(To): Refer to FIG. 1 (To), move the bending die 6 back and forth to adjust the distance between the bending die 6 and the perpendicular line 8' of the winding center 8 to correspond to 100 windings of the mainspring.

That is, at the beginning of winding the mainspring 10, the bending guide 6 is placed as shown in the illustration. 6', the distance from vertical M8' to L1 is set, and as the mainspring 10 winds, it is brought close to vertical line 8', and at the end of winding of mainspring 10, position so that the distance from the perpendicular line 8' is -.

・0: Refer to FIG. 10, move the bending die 6 up and down to adjust the distance between the bending die 6 and the horizontal line r of the winding center 8 in accordance with the spring equinox.

That is, at the beginning of the 100th winding of the mainspring, the bending guide 6 is positioned at the solid line 6' shown in the diagram, and the distance from the horizontal line 8' is set to h, and as the mainspring 100 winds proceed, it is brought close to the horizontal line DA, and At the end of the volume, the distance from the horizontal line 8' is -
Make it.

The specific amount of variation in the bending die 6 due to (a) @0 is as follows: - The curvature to be imparted to each part of the mainspring's entire length is quantitatively determined in advance by the entrance process 1, and the bending die corresponding to the constant ii is The required radius of bending according to No. 6 is determined individually according to the winding property of the mainspring lO.

In addition, since the relative position of the material guide 4 and the winding center 8 is specified in any winding process, the winding center 8 or the perpendicular line 8' of the winding center 8 Alternatively, if the position of the bending die 6 is varied with respect to the horizontal line DA of the winding center 8, the relative position of the bending die 6 with respect to the material guide 4 is varied, and the bending radius of the material by the bending die 6 is varied.

"Operation" According to the above-described forming method of the present invention, - in the entry step 1, the radius of bending of the spring material 5 by the bending guide 6 is adjusted to
Since it can be adjusted to correspond to 0 windings, the curvature of each part of the mainspring's entire length after the next winding can be adjusted intentionally, and the mainspring length can be gradually decreased as shown in Figure 2 (A). It can be shaped to a certain curvature.

When the mainspring 10 having the above primary winding curvature is formed into a predetermined figure-8 mainspring spring through the secondary winding process, the second
The free state curvature shown in Fig. 0 is given, and the torque characteristics based on the free state curvature are qualitatively as shown in Fig. 2 (q). , it is possible to form a high-performance spring that satisfies the narrow range of torques Tl and T2 in the number of tightening and unwinding operations N1 and N2 in the usage range.

``Effects of the Invention'' In addition to the above explanation, the forming method of the present invention has the above-mentioned special effects, and even if a high degree of spring performance is required, with an extremely narrow upper and lower limit range of allowable torsion, In addition to satisfying the required performance, it is possible to form a spring with a spring constant of zero or close to zero even when the barrel housing the mainspring is housed and the material conditions are constant. It has remarkable effects such as improving design flexibility and expanding the range of applications.

[Brief explanation of the drawing]

Figure 1 (A) (B) 0: Front view showing specific means of the molding method of the present invention, 2N: Characteristics of a mainspring spring produced by the molding method of the present invention, (A@ is a curvature diagram, 0 Hatching characteristic diagram, Figure 8 (a) @: Front view showing the conventional molding method, Figure 8 00: Spring spring characteristic line regenerative sign by the conventional molding method, l knee entry Process, 2: Secondary winding process, 8: Feed roller, 4: Material guide, 5: Spring material, 6: Bending die, 7: Guide section, 8: Winding center, 10: Mainspring patent applicant Chuo Spring Co., Ltd. Representative Patent Attorney Kenmi Oka #8' (B) Figure i1 (B) Support eye α2

Claims (4)

[Claims] (1) An S-shaped mainspring consisting of a primary winding process in which the spring material extruded from a material guide is brought into contact with a bending die to be bent into a mainspring winding process, and a secondary winding process in which the spring material is reversely wound after the primary winding process. In forming the spring, the primary winding process is performed by varying the relative position of the bending die with respect to the material guide in accordance with the progress of the spiral winding, and adjusting the radius of bending by the bending die to wind the spring. How to form a letter-shaped mainspring. (2) A method for forming an S-shaped mainspring spring according to claim (1), wherein the bending radius is adjusted by rotating a bending die. (3) A method for forming an S-shaped mainspring spring according to claim (1), wherein the bending radius is adjusted by moving a bending die close to and away from a perpendicular line of the winding center. (4) The method for forming an S-shaped mainspring spring according to claim (1), wherein the bending radius is adjusted by moving a bending die up and down with respect to a horizontal line at the center of the winding.