JPH08281329A - Production of deformed steel wire rod for piston ring and coiling machine therefor - Google Patents

Abstract

PURPOSE: To prevent tangle and intertwinement at uncoiling by executing coiling /uncoiling of wire rod from a reel having flange at both ends to a similar reel and executing uncoiling while the reel is held horizontally and at tightly coiled state. CONSTITUTION: In producing a deformed steel wire rod for piston ring, at the process, in which a wire rod 1 is finally form to deformed cross section, and processes thereafter, the uncoiling and coiling of wire rod 1 use a reel 10 having a flange 12 at both ends. For uncoiling, a horizontal shaft is inserted in a through hole 13 of flange 12, the reel 10 is used as laid horizontally. The coiling loop of wire rod 1 is made in tight contact with a lower layer or coiling barrel 11. In case production process of deformed wire is stopped in emergency, the reel 10 of uncoiling device is braked in time lag and the wire 1 is slackened. In the case of a vertical reel, the slackened wire 1 is fell down by gravity, causing tangle, intertwinement. The horizontal shaft reel 10 is free from such trouble.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing a deformed steel wire rod for producing a piston ring of an internal combustion engine, in particular for a continuous working and treating method and especially for the wire rod suitable for use in a continuous heat treatment furnace. Regarding the unwinder.

[0002]

2. Description of the Related Art A piston ring is a curled wire rod that has a predetermined cross-sectional shape and has undergone quenching and tempering heat treatment. It becomes an article. The above heat-treated cross-section deformed wire rod has a feature of preventing breakage at the time of curling and reducing the finishing allowance during finish polishing, especially for the corners of the cross section.
Surface roughness, cracks, dents, abrasions, etc. are strictly limited. In addition, in the wire having a deformed cross section, the variation of the winding diameter during curling is severely limited, and the variation width exceeds a permissible value, and a coil is often generated.

The main manufacturing steps of the deformed steel wire rod for a piston ring are as follows. The surface layer is removed for flaw removal of the hot rolled material. After forming a circular wire rod having an appropriate diameter corresponding to the cross-sectional area of the product, a cold-working process is mainly repeated by a roll forming method, a hole die drawing method, or the like to a predetermined irregular cross-sectional shape. An intermediate annealing step is inserted at an appropriate stage of this series of cold working. After completing the modified cross-sectional shape, it is quenched to a suitable hardness and tempered. In the case of a two-piece type oil ring, oil holes are punched in the web portion prior to the heat treatment. These processes and treatments are generally continuous, that is, they are often performed while unwinding from one end of the wire to the other end and winding.

In the usual winding of a wire rod, a bundling method (a method of winding a wire rod and then removing it from a winding drum or a winding frame to form a single coil) is employed. It is also used in the manufacture of.
Further, as the unwinding method in the manufacture of the steel wire rod, there is an unwinding method in which the reel is a hard shaft because of the simplicity of the device. Further, the heat treatment method is almost limited to the continuous heat treatment method from the viewpoint of suppressing the winding diameter variation. And
The unwinding in this process has been conventionally performed by using a reel, but this reel uses the above-mentioned rigid shaft type or one in which the flange portion of the reel is supported by two horizontal idle rollers. It was being done.

[0005]

The inventor of the present invention has found that there are various problems to be solved in the conventional method of manufacturing a steel wire rod for a piston ring. That is, in the conventional bundling method, after sharp corners are formed, rubbing marks are generated due to mutual rubbing of loops of wire rods, and entanglement and entanglement cause wire breakage and work interruption. Also, the corners were easily damaged during transportation and storage. Also, when using the reel as a hard axis for unwinding,
It was found that entanglement and entanglement were likely to occur. Furthermore, it was necessary to take measures to suppress the fluctuation of the winding diameter during the curling. The inventor has found that the cause of the variation in the winding diameter during curling is that the quenching temperature in continuous heat treatment depends on the material.
Since the temperature is often 1050 ° C. or higher, the tensile strength of the wire material during quenching is extremely low, and it is a driven type that utilizes the tension of the wire material to be unwound as the unwinding driving force. In the unwinding machine, it was found that the wire rod was stretched and deformed by a very small amount due to the excessive unwinding tension. As the unwinding device, it is possible to rotate the reel while automatically controlling the slack of the unwinding wire rod without depending on the driven type, but it has a great equipment cost. Therefore, it is practically difficult to implement.

Recently, in order to improve the productivity, the unit weight of the coil has increased, and the curling diameter fluctuation failure accident due to this elongation is increasing. The present invention is a method for producing a deformed steel wire rod for a piston ring, which prevents the occurrence of scratches, entanglement, and entanglement during unwinding, transportation, and storage, and minimizes the fluctuation width of the winding diameter during curling, It is an object of the present invention to provide an inexpensive unwinding machine that is optimal for preventing elongation deformation.

[0007]

Means for Solving the Problems After the formation of sharp corners, the inventor of the present invention conducts continuous processing of a wire rod using a particular reel in a particular state, thereby generating scratches. I found that it was possible to eliminate tangling and entanglement. Further, the present inventor uses a driven type unwinding machine composed of a reel having a specific structure and an unwinding table so that even a heavy coil material can maintain the wire rod being heat-treated in a tight state and minimize the tension. It has been found that this makes it possible to prevent elongational deformation during heat treatment and prevent fluctuations in the curling diameter.

That is, according to the present invention, the unwinding and winding of the wire in the processing step of finally forming the wire into an irregular cross section and the subsequent processing are performed from a reel having flanges at both ends to the same reel. Unwinding is performed while the reel is set to the horizontal axis and while maintaining a tight state, and a method for manufacturing a deformed steel wire rod for a piston ring of an internal combustion engine, and one end portion of which is rotatable in a cantilever shape. The reel is composed of an unwinding base having a supported horizontal or substantially horizontal reel supporting shaft, and a reel composed of a winding drum and flanges at both ends thereof, the reel having a cantilever of the reel supporting shaft in a through hole extending along the axis thereof. Of a deformed steel wire rod for a piston ring, characterized in that the rod-shaped portion is inserted into and supported by the reel member, and has an idling prevention means between the reel and the support shaft. It is out machine. In the present invention, it is desirable to wind the wire into a uniform spiral shape, and it is desirable to wind the wire with a gap in the width direction.

[0009]

In the present invention, the tight state means that the winding loop of the wire is in close contact with the loop or the winding drum of the lower layer, but the degree of adhesion is not a problem and the upper and lower layers of the winding loop are not affected. It is the degree to which there is no gap visually. In the present invention, after forming the final cross-section (having sharp corners), the wire is tightly held between the flanges at both ends during and after this step and during transportation and storage between these steps. Because it is caught and cannot move freely, certain loops that cause entanglement or entanglement do not sneak under or rub against other loops. Further, the wire rod is protected from external impacts and the like by both flanges.

In the manufacturing method of the present invention, the reel is used with the reel as the horizontal axis. The wire drawing device and rolling device used for manufacturing the deformed steel wire rod for a piston ring may be stopped urgently for safety reasons. At this time, since the unwinding device is braked with a time delay with respect to these devices, the wire rod being processed is loosened between the unwinding device and the processing device, and the number of upper layers in the reel is increased. Like a mainspring, the loop diameter expands and the tightness of the loop collapses, so when unwinding with a vertical reel, several loops slide down due to gravity, which causes work interruption, entanglement, and entanglement. Therefore, in the present invention, the reel is used as the horizontal axis.

Like the mainspring, the wire rod is tightly wound on the winding drum with a smaller curvature than that shown in the free state, so that a torque is generated in the reel in an attempt to release the tightness. Therefore, in order to maintain the close state, the reel should have a moderate resistance to rotation, and for this purpose, it is effective to mount a brake capable of controlling the rotation torque. Since the driven unwinder of the present invention has the axis centered horizontally, even when slack occurs in the wound wire, the loop of the wire does not slide down to the lower flange side by its own weight as described above, and is entangled, Less risk of scratches. Also, since the reel is supported by the through hole along the axis, even if the outer diameter of the flange is worn or deformed, the reel is supported by two horizontal rollers, so there is little vertical movement of the center of gravity, so it is a driven type. Even if it is, it can rotate smoothly and with low tension. As a result, it is possible to prevent a change in curling diameter due to elongation without giving an excessive tension even to a heavy heat-treated wire.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a winding state of a reel 10 and a wound wire 1 according to the present invention. The reel 10 is composed of a winding cylinder 11 and flanges 12 and 12 fixedly provided on both ends of the winding cylinder 11. A through hole 13 is provided in the flange along the axial center. It consists of a taper part that opens to. The wound wire rod 1 is fixed by inserting a hook-shaped bent tip into a small hole 14 provided in the winding drum, and is wound onto the winding drum 11 by rotation of the reel 10 (the small hole 14 is It may be provided on the flange). At this time, the wire rod 1 is wound into a uniform spiral by traversing the wire rod guide (not shown) and the reel 10 at a relatively appropriate constant speed.

In FIG. 1, each loop of the wire rod has a gap C in the width direction.
Have been involved. This method is excellent in that, for a certain range of the width dimension W of the wire, the above-mentioned constant traverse speed can be achieved regardless of the dimension, and rubbing can be reliably prevented. In this method,
With normal winding tension, the loop does not move and winding can be performed tightly. After the entrainment has reached one end, the traverse movement is a return process with respect to the forward process. As a result, the wire 1 is rolled up in multiple layers.

As a result, the upper layer loop intersects with the lower layer loop at an angle of twice the spiral angle. Therefore, even if the width dimension W changes to a considerably wide range, the upper layer loop falls into the gap C or is distorted. It has been confirmed that there is virtually no occurrence of a sharp bend. FIG. 2 shows a case where the wire rod is wound in close contact with the width direction. This method is excellent in that the winding space of the reel can be efficiently used and the movement of the loop can be prevented more reliably. Using the unwinding machine described later, the processing step that uses the bundling method after the sharp corners are formed and the step that uses the vertical reel as the unwinding method As a result of adopting the reel application method, the wire rod is unwound while maintaining a tight state, which also completely prevents scratches and entanglements due to rubbing, disconnection and work interruption due to entanglement, and prevents the occurrence of scratches and improves work efficiency. I was able to achieve a great effect.

Next, FIG. 3 shows an example of the unwinding machine of the present invention. The unwinding machine comprises the reel 10 and the unwinding table 20 described above. The unwind table 20 has a cantilever-shaped one end and is rotatably supported so that the reel support shaft 21 is horizontally supported.
And the compressed air from the compressed air source 22 to the regulator 23
It is composed of a braking means 24, which is a disc brake, and the like, by which the rotational torque of the reel supporting shaft 21 can be arbitrarily adjusted by decompressing, adjusting and supplying. The reel 10 has tapered portions 2 of the reel support shaft 21 in which the tapered portions of the through holes 13 extending along the axis of the reel 10 are opened toward both ends.
By being supported by the taper portion of 1a and the nut 25, concentricity with the reel support shaft 21 is guaranteed.

The reel 10 is prevented from idling with the reel support shaft 21 by being tightened at both taper portions. Further, the reel 10 is made of an iron plate,
The balance adjusting weight 26 is a magnet base with a lever, and these are for a reel having a large center of gravity deviation (which can be easily perceived by releasing the braking means 24 and observing the swinging movement of the reel 10). The balance can be adjusted to ensure smooth rotation of the reel 10. By adjusting the secondary pressure of the regulator to the lowest pressure at which the wire on the winding cylinder can be unwound while maintaining a tight state,
The tension of the unwound wire can be kept to a minimum. The present embodiment is characterized in that the braking force can be adjusted, the axial center can be held by using a taper, and the center of gravity balance can be adjusted. By adopting the unwinding machine in the heat treatment furnace, compared to the conventional unwinding device,
It was possible to double the coil unit weight, completely prevent the elongation accident during the heat treatment, and prevent the curling diameter fluctuation due to the elongation.

[0017]

As described above, according to the method for manufacturing a deformed steel wire rod for a piston ring of the present invention, the entanglement occurs in the conventional processing process by bundling or unwinding in the process using the vertical reel. It is possible to prevent entanglement, thereby almost completely preventing disconnection, work interruption and rubbing due to this, and the unwinding machine of the present invention makes the coil unit weight twice as large as that of the conventional device. In addition, it was possible to prevent the occurrence of defective curling diameter fluctuation defects due to elongation that frequently occurred in the conventional heat treatment process.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a reel of the present invention and a method of winding a wire on the reel (gap winding).

FIG. 2 is a diagram showing an example of a reel of the present invention and a method for winding a wire rod around the reel (contact winding).

FIG. 3 is a diagram showing an example of the unwinding machine of the present invention.

[Explanation of symbols]

1 wire rod, 10 reel, 11 winding drum, 12 flange, 13 through hole, 14 small hole, 20 unwinding stand, 21
Reel support shaft, 22 compressed air source, 23 regulator, 24 braking means, 21a tapered portion, 25 nut, 26 balance adjustment weight

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B65H 54/08 B65H 54/08 59/04 59/04 75/14 75/14 F C21D 9/40 C21D 9/40 B 9/56 102 9/56 102 9/68 9/68 F02F 5/00 F02F 5/00 N // B21F 37/02 B21F 37/02

Claims (4)

[Claims] 1. The unwinding and winding of the wire in the processing step of finally shaping the wire into a modified cross-section and the subsequent processing is performed from a reel having flanges at both ends to a similar reel, and the unwinding is performed. , The reel as the horizontal axis,
And a method for manufacturing a deformed steel wire rod for a piston ring of an internal combustion engine, which is performed while maintaining a close state. 2. The deformed steel for a piston ring of an internal combustion engine according to claim 1, wherein the deformed steel wire rod is wound into a spiral shape which is substantially uniform except for both ends and is wound so as to intersect with the upper layer and the lower layer. Manufacturing method of wire. 3. The method for manufacturing a deformed steel wire rod for a piston ring of an internal combustion engine according to claim 2, wherein the deformed steel wire rod is wound in one layer with a gap substantially in the width direction. 4. An unwinding stand having a horizontal or substantially horizontal reel supporting shaft rotatably supported in a cantilever shape at one end, and a reel comprising a winding drum and flanges at both ends thereof. Is supported by inserting a cantilevered beam-shaped portion of the reel support shaft into a through hole extending along the axis thereof, and having an anti-idling means between the reel and the support shaft. Unwinder for deformed steel wire rod for piston rings.