JP3266375B2 - Coiling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coiling apparatus for forming a wire into a ring shape, and more particularly to a technique which is effective when used for manufacturing a piston ring.

[0002]

2. Description of the Related Art Generally, a wire forming a steel piston ring is bent by a coiling device 10A shown in FIG. The coiling device 10A will be described below.

In FIG. 4, a deformed wire 1 is supplied from a wire supply section (not shown) to a bending section comprising three bending rollers 2, 3, 4 and a stretch 5. In this bending section, first, three bending rollers 2, 3 and 4 apply a forming force to the wire 1. That is, the wire rod 1 inserted between the first bending roller 2 and the second bending roller 3 is then inserted between the second bending roller 3 and the third bending roller 4, It is bent to a predetermined radius of curvature R1. At this time, the curvature is formed at the position P ₃ of the second bending roller 3.

The wire rod 1 that has been subjected to the primary bending passes through a stretch 5 next, and the second bending roller 3, the third bending roller 4 and the stretch 5 cause the wire 1 to have a direction opposite to that of the primary bending, that is, a diameter. It undergoes secondary bending in the direction to increase, and a stable radius of curvature R2 is obtained. At this time, the curvature is formed at the position P ₄ of the third bending roller 4. The P ₄ position after, the radius of curvature does not change, is coiled in a circle.

It is empirically known that a stable ring diameter can be obtained by performing secondary bending in the direction opposite to primary bending as described above. It is considered that this is because the ring after the primary bending has an imbalance in springback and stress balance.

In the conventional coiling apparatus 10A, the first bending roller 2 and the second bending roller 3 on the side of the wire supply section are mounted on a fixed surface plate 7. The third bending roller 4 and the stretch 5 are attached to respective moving bodies 40A and 50A movably provided on the fixed surface plate 7. Each moving body 4
Each of 0A and 50A is movable in two orthogonal directions, and by adjusting the positions of the third bending roller 4 and the stretch 5, rings of various sizes and shapes can be formed.

[0007]

The coiling apparatus 10A described above has a disadvantage that the geometrical positional relationship between the formed ring and the third bending roller 4 and the stretch 5 is not uniquely determined. In other words, when the third bending roller 4 or the stretch 5 is moved, the angle between the ring and these contact points on the ring changes. Alternatively, to keep the angle of contact on the ring constant,
Of the bending roller 4 and the stretching 5 must be moved at a constant ratio. Further, the relationship between the ring diameter and the amount of movement of the third bending roller 4 or the stretch 5 is extremely complicated. For this reason, there is a drawback that the setup for coiling to a desired ring diameter and the calculation of the amount of movement of the third bending roller 4 and the stretch 5 for coiling to a non-circular ring are complicated.

An object of the present invention is to provide a coiling apparatus which can easily set a bending roller or a stretch for obtaining a desired ring diameter and can easily perform coiling to a desired non-circular ring. Is to do.

[0009]

SUMMARY OF THE INVENTION The present invention is directed to a coiling apparatus having a wire feeding section and a bending section formed of three bending rollers and a stretch. A bending roller is disposed on a fixed table, and the remaining one bending roller and a stretch are disposed on a movable movable table. The bending roller and the stretch disposed on the movable table move back and forth on respective moving axes. To the moving platform
It is configured to be movable Te, the bending point of intersection of the axis of movement of the moving axis and the stretch rollers is constant with respect to the moving base
It is characterized by being fixed in position .

[0010] The supply section of the wire is configured to supply the wire to the bending section by a feed roller,
By moving the stretch back and forth in synchronization with the rotation angle of the feed roller, coiling into a desired non-circular ring can be easily performed.

[0011]

The coiling device according to the present invention includes a fixed base provided with two bending rollers and a movable base provided with one remaining bending roller and a stretch. The bending roller and the stretch arranged on the moving table are configured to be movable back and forth on the moving axis with respect to the moving table ,
It is bending axis of movement of the moving axis and the stretch rollers name a predetermined angle, (hereinafter referred to as virtual center) point of intersection between the axis of movement of the axis of movement and stretching of the bending roller, the bending rollers and stretching movement axis Even when moving back and forth, it is always at a fixed position with respect to the mobile platform. The virtual center can be made to coincide with the center of the ring to be formed by moving the movable table.

As shown in FIG. 2, when the center O ₁ of the bent ring 15 coincides with the virtual center O ₃ , the ring diameter and the geometric position of the movable bending roller 4 and the stretch 5 can be adjusted. The relation is represented by a simple relation as follows. A is the moving axis of the bending roller 4 and B is the moving axis of the stretch 5.

[0013] ring 15 during molding in diameter D center: O ₁ diameter D in the radial thickness of the ring 15 during molding: T bend radius of the roller 4: d bending roller 4 of the center O ₂ and the ring 15 distance between the center O _1: the contact point of l _C stretch 5 of the tip pin 6 and the ring 15 of the distance between the center O ₁ of the-ring 15: if _{l S, l C = D /} 2 + d / 2 · .. And l _s = D / 2−T.

The wire supply section is configured to supply the wire to the bending section by a feed roller,
By moving the stretch back and forth in synchronization with the rotation angle of the feed roller, the curvature of each part of the ring formed according to the feed amount of the wire changes, so that the coil can be easily coiled into a desired non-circular shape. Can be molded.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, a wire feeding unit (not shown) sandwiches the wire 1 between two feed rollers and turns the wire 1 at a predetermined speed into three bending rollers 2, 3, 4 and a stretch 5.
Is supplied to the bending section.

The wire rod 1 of the three bending rollers 2, 3, 4
The first bending roller 2 and the second bending roller 3 on the supply unit side are mounted on a fixed platen 7.

The remaining one bending roller, that is, the third bending roller 4 and the stretch 5 are attached to each of the movable bodies 40 and 50 movably provided on the movable base 8. The moving platen 8 is movable in two orthogonal directions. Each of the moving bodies 40 and 50 can move back and forth on the respective moving axes A and B. Therefore, the third bending roller 4 can move back and forth on the movement axis A, and the stretch 5 can move back and forth on the movement axis B. Since the angle of the axis of movement B of the third bend axis of movement A and the stretch 5 of the roller 4 is fixed to 60 degrees, the two axis of movement A, the intersection i.e. virtual center O ₃ of B, mobile constant Board 8
Is determined as a fixed point fixed at a fixed position .
Reference numeral 6 denotes a pin at the tip of the stretch 5.

The setting of the bending roller and the stretch for obtaining the desired ring diameter in the coiling device 10 will be described.

[0019] FIG. 3 (a) shows a case that is coiling molded in diameter D _1. In this case, it matches the virtual center O ₃ and the center O ₁₀ of the ring 15A. From this state, when changing the coiling diameter to obtain the ring diameter D ₂ is performed as follows.

(1) First, l _C and l _S for the case where the ring diameter is D ₂ are calculated by the above-described equations. In accordance with the calculated l _C and l _S , the third bending roller 4 and the stretch 5 are moved on the moving axes A and B and fixed at predetermined positions (see FIG. 3B). (2) Next, the ring 15B is formed in this state (FIG. 3).
(B)). (3) Next, the center O ₁₁ of the shaped ring 15B determined on the fixed base 7 (see FIG. 3 (b)), to move the moving platen 8, around a virtual center O ₃ of the ring 15B O ₁₁ (see FIG. 3C). (4) In this state, the ring 15C is formed again (see FIG. 3C). O ₁₂ is the center of the formed ring 15C.

Thereafter, by repeating the above steps (3) and (4) a plurality of times, the displacement between the center of the ring and the virtual center gradually decreases, and eventually coincides. When the center of the ring coincides with the virtual center, the desired ring diameter D
_Two rings are coil formed.

The coiling molding will be described.
, The wire 1 is supplied from a wire supply section to a bending section formed by three bending rollers 2, 3, 4 and a stretch 5. In this bending section, first, three bending rollers 2, 3 and 4 apply a forming force to the wire 1. That is, the first
The wire rod 1 inserted between the second bending roller 2 and the second bending roller 3 is then inserted between the second bending roller 3 and the third bending roller 4 to have a predetermined radius of curvature. It is bent. At this time, the curvature is formed at the position P ₃ of the second bending roller 3.

The wire rod 1 that has undergone the primary bending passes through the inside of the pin 6 of the stretch 5 while being in contact therewith, so that the second bending roller 3, the third bending roller 4 and the stretch 5 next bending the opposite direction i.e. receiving direction to the secondary bending to increase the diameter to obtain a stable ring diameter D _2. At this time, the curvature is formed by the third bending roller 4.
It is a P ₄ position of. The P ₄ position after, the radius of curvature does not change, is coiled in a circle.

The stretch 5 is moved back and forth by numerical control in synchronization with the rotation angle of the feed roller of the supply section of the wire 1 to change the curvature of each part of the ring formed in accordance with the feed amount of the wire 1. Accordingly, it is possible to easily coil-mold a desired non-circular ring, for example, a non-circular ring capable of applying a uniform surface pressure when the abutment is closed.

[0025]

As described above, according to the coiling device of the present invention, setting of a bending roller and a stretch for obtaining a desired ring diameter can be easily performed. In addition, coiling can be easily performed into a desired non-circular ring.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a coiling device according to an embodiment of the present invention.

FIG. 2 is a view showing a geometrical relationship between a ring diameter and a bending roller and a stretch in the coiling device of the present invention.

FIG. 3 is a diagram for explaining setting of a bending roller and a stretch in the coiling device of the present invention.

FIG. 4 is a plan view showing a main part of a conventional coiling device.

[Explanation of symbols]

1 wire material 2,3,4 bending roller 5 stretch 6-pin 7 fixed plate 8 moving plate 10 coiling device 15, 15A, 15B, 15C forming rings 40 and 50 mobile A, B movement axes O _1, O _10, O ₁₁ , O ₁₂ Center of forming ring O ₂ Center of bending roller O ₃ Virtual center

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21F 1/00 B21D 11/10 F02F 5/00 F16J 9/00

Claims (2)

(57) [Claims] 1. A coiling device comprising a wire feeding section and a bending section comprising three bending rollers and a stretch, wherein two bending rollers on the wire feeding section side are arranged on a fixed base. The remaining one bending roller and the stretch are disposed on a movable movable table, and the bending roller and the stretch disposed on the movable table are configured to be movable back and forth on the respective moving axes with respect to the movable table. The intersection of the moving axis of the bending roller and the moving axis of the stretch
Is fixed at a fixed position with respect to the moving table . 2. A wire feeding section configured to feed a wire to a bending section by a feed roller, wherein the stretch is moved back and forth in synchronization with a rotation angle of the feed roller. The coiling device according to claim 1.