JP3435888B2 - Manufacturing method of deformed steel wire rod for piston ring - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a deformed steel wire for manufacturing a piston ring of an internal combustion engine, particularly to a method of continuous processing and processing, and particularly to a continuous heat treatment furnace. The present invention relates to a method for manufacturing the same wire material suitable for use in a wire. 2. Description of the Related Art A piston ring has a predetermined irregular cross-sectional shape, and a quenched and tempered wire rod is curled in a close contact spiral shape in a cold state, and after individual cutting, surface treatment and finish polishing are performed. It will be a finished product. The above-mentioned heat-treated cross-section deformed wire material is particularly suitable for the corner (corner) portion of the cross-section from the viewpoint of preventing breakage at the time of curling and reducing the finishing allowance in finish polishing.
Surface roughness, cracks, dents, abrasions, etc. are severely restricted. In addition, the variation in the winding diameter of the cross-sectionally shaped wire during curling is severely restricted, and a coil in which the variation exceeds an allowable value and becomes defective frequently occurs. [0003] The main manufacturing steps of the deformed steel wire for the piston ring are as follows. The surface layer is removed to remove the hot rolled material. After a round wire having an appropriate diameter corresponding to the cross-sectional area of the product is formed, cold working 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 in this series of cold working. After completing the irregular cross-sectional shape, it is quenched to an appropriate hardness and tempered. In the case of a two-piece oil ring, an oil hole is punched in the web portion prior to the heat treatment. These processes and processes are generally performed continuously, that is, while the wire is unwound from one end to the other end and wound up. [0004] In the ordinary winding of a wire, a winding method (a method of winding the wire, removing it from a winding drum or a winding frame to form a single coil) is adopted, and the steel wire for a piston ring is used. It is also used in the manufacture of
Further, as an unwinding method in the production of the steel wire rod, there is an unwinding method using a reel as a rigid shaft because of the simplicity of the apparatus. In addition, from the viewpoint of suppressing the fluctuation of the winding diameter, the heat treatment method is substantially limited to the continuous heat treatment method. And
Unwinding in this process has conventionally been carried out using a reel, but the reel used is the above-mentioned rigid shaft type or a type that supports the flange portion of the reel on two horizontal idle rollers. Had been. [0005] The present inventor has found that there are various problems to be solved in the conventional method of manufacturing a steel wire for a piston ring. In other words, in the conventional method of binding, after a sharp corner portion is formed, abrasion due to mutual rubbing of the loops of the wire, entanglement, disconnection due to entanglement, or interruption of work occurs. The corners were easily damaged during transportation and storage. Also, when using the reel as a solid shaft for unwinding,
It was found that entanglement and entanglement easily occurred. Further, a measure for suppressing the fluctuation of the winding diameter during the curling was required. The present inventor believes that the cause of the fluctuation of the winding diameter during the curling is that the quenching temperature in the continuous heat treatment depends on the material.
Since the temperature is often high at 1050 ° C. or higher, the wire during the quenching treatment has a very low tensile strength, and is driven by using the tension of the unwound wire as the unwinding driving force. In the unwinding machine, it was found that the wire was elongated and deformed by a very small amount due to excessive unwinding tension. As an unwinding device, it is possible to rotate the reel while automatically controlling the slack of the unwinding wire rod without using the driven type, but it has a large facility cost. This is practically difficult to implement. [0006] Recently, particularly for improving the productivity, the unit weight of the coil has been increased, and the number of accidents in which the curling diameter varies poorly due to the elongation is increasing. The present invention prevents the occurrence of abrasions, entanglement and entanglement during unwinding, transportation and storage, minimizes the fluctuation width of the winding diameter during curling , and elongation deformation during heat treatment.
And to provide a manufacturing <br/> how optimal piston ring for deformed steel wire to prevent. After the sharp corners are formed, the inventor of the present invention rubs the wire by performing continuous processing of the wire using a specific reel in a specific state. It has been found that generation of flaws, entanglement, and entanglement can be eliminated. In addition, the present inventor can use a reel and an unwinding method having a specific structure to minimize the tension while keeping the wire being heat-treated tight even with a heavy-weight coil material. It has been found that the deformation of the curling diameter can be prevented by preventing elongation deformation during the heat treatment. That is, according to the present invention, the unwinding and winding of the wire in the processing step of final shaping the wire into a deformed cross section and the subsequent processing are performed from a reel having flanges at both ends to a similar reel. unwinding the said reel on the horizontal axis, and rows that have while maintaining a tight state, before
The winding is a substantially uniform spiral except at both ends.
And the upper and lower layers intersect, and there is substantially no gap in one layer in the width direction.
A method for producing a deformed steel wire rod for a piston ring of an internal combustion engine, characterized by being wound around with a gap. In the present invention, the tight state means that the winding loop of the wire rod is in close contact with the lower layer or the winding drum. Means that there is no gap between the upper and lower layers visually. In the present invention, the wire is tightly held between the flanges at both ends after the final cross section (sharp corners are formed), during this step and thereafter, and during transportation and storage between these steps. Because they are entangled and cannot move freely, certain loops that cause entanglement or entanglement do not slip under other loops nor rub. The wire is protected from external impacts and the like by the two flanges. In the manufacturing method of the present invention, unwinding is performed using a reel as a horizontal axis. A wire drawing device or a rolling device used for manufacturing a deformed steel wire rod for a piston ring may be emergency stopped for safety. At this time, the unwinding device is braked on these devices with a time delay, so that the wire being processed loosens between the unwinding device and the processing device, and the number of upper layers in the reel is reduced. The loop is enlarged in diameter like a mainspring, and the tightness is broken. Therefore, in unwinding with a vertical reel, several loops slip down due to gravity, which causes work interruption, entanglement, and entanglement. For this reason, the present invention uses the reel as the horizontal axis. Since the wire is tightly wound on the winding drum with a smaller curvature than when the wire is shown in a free state as in the case of a mainspring, torque is generated on the reel in an attempt to release the tightness from the tight state. Therefore, in order to maintain the tight state, the reel should have an appropriate resistance to rotation, and for this purpose, it is effective to install a brake capable of controlling the rotation torque. Driven type unwinding machine that can be applied to the production method of the present invention by the axis horizontal, even when slack occurs in the winding wire, slipping into the flange side of the lower loop is self-weight of the wire as described above No risk of entanglement and scratches. In addition, the reel is supported by a through hole along the axis, so even when the outer diameter of the flange is worn or deformed, there is little vertical movement of the center of gravity as in the conventional case supported by two horizontal rollers. However, it is possible to rotate smoothly and with low tension. Thereby, even if a heavy wire to be heat-treated is not applied with an excessive tension, a change in the curling diameter due to elongation can be prevented. 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 comprises a winding drum 11 and flanges 12, 12 fixedly provided at both ends thereof. The flange has a through hole 13 extending along the axis, and the through hole 13 is formed in a direction opposite to a cylindrical portion at both ends. And a tapered portion that opens to the front. The wound wire 1 is fixed by inserting a hook-shaped tip into a small hole 14 provided in the winding drum, and is wound on the winding drum 11 by rotation of the reel 10 (the small hole 14 is May be provided on the flange). At this time, by traversing the wire guide (not shown) and the reel 10 relatively at an appropriate constant speed, the wire 1 is wound in a uniform spiral shape. In FIG. 1, each loop of the wire is formed with a gap C in the width direction.
Is involved. This method is excellent in that a certain traverse speed can be set for a certain range of the width W of the wire regardless of the size, and that rubbing can be reliably prevented. In this method,
With normal winding tension, the loop does not move and can be wound tightly. After the wrapping reaches one end, the traverse movement is a return step to the above-described forward step. As a result, the wire 1 is wound in a multilayer shape. As a result, the upper layer loop intersects the lower layer loop at a helical angle × 2 times the angle of the lower layer loop. 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 practically no curving. For reference , FIG. 2 shows a case where the wire is wound almost in close contact in 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 more reliably prevented. For the processing step that employed the bundling method after the sharp corners were formed and the step using a vertical reel as the unwinding method, for example , using an unwinder described below, As a result of adopting the above-described reel application method, the wire is unwound while maintaining a tight state, thereby completely preventing scratches and entanglement due to rubbing, disconnection due to entanglement and interruption of work, preventing occurrence of scratches and work efficiency. A great effect could be obtained for the improvement. Next, FIG. 3 shows that the present invention can be applied to the manufacturing method.
Shows an example of that unwinding machine. The unwinding machine includes the above-described reel 10 and unwinding stand 20. The unwinding stand 20
The reel support shaft 21 is rotatably supported horizontally with one end in a cantilever shape, and the compressed air from a compressed air source 22 is depressurized and adjusted by a regulator 23 to be supplied. 21 comprises a braking means 24 which is a disk brake capable of arbitrarily adjusting the rotational torque. The reel 10 has a through hole 13 along its axis.
Are supported by the tapered portion 21a of the reel support shaft 21 and the tapered portion of the nut 25, thereby ensuring concentricity with the reel support shaft 21. The reel 10 is fastened at both tapered portions, thereby preventing idle rotation between the reel 10 and the reel support shaft 21. 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 deviation of the center of gravity (can be easily perceived by releasing the braking means 24 and observing the swinging motion 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 minimum pressure at which the wire on the winding drum can be unwound while maintaining the tight state,
The tension of the unwound wire can be kept to a minimum. This embodiment is characterized in that the braking force can be adjusted, the axis center is maintained by using a taper, and the center of gravity balance can be adjusted. By adopting the unwinding machine in the heat treatment furnace, the unwinding machine is 2
It was possible to double the coil weight, completely prevent the occurrence of elongation during the heat treatment, and prevent the curling diameter from fluctuating due to the elongation. As described above, according to the method of manufacturing a deformed steel wire rod for a piston ring according to the present invention, the winding process in the conventional processing process by bundling or the process in which a vertical reel is used is used. Unwinding prevents entanglement and entanglement, thereby almost completely preventing disconnection, interruption of work, and rubbing, and the unwinding machine applicable to the manufacturing method of the present invention allows the coil unit weight to be reduced to a conventional device. And the curling diameter variation failure due to the elongation that occurred frequently in the conventional heat treatment process could be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an example of a reel of the present invention and a method of winding a wire around the reel (gap winding). FIG. 2 is a diagram showing an example of a method of winding a reel and a wire around the reel as a reference of the present invention (close-contact winding). FIG. 3 is a diagram showing an example of an unwinder applicable to the manufacturing method of the present invention. [Description of Signs] 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 part, 25 Nut, 26 Balance adjustment weight

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI 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 (58) Field surveyed (Int. Cl. ⁷ , DB name) B21C 45 / 00-49/00 B23P 15/06 B65H 54/08 B65H 59/04 B65H 75/14 C21D 9/40 C21D 9/56 102 C21D 9/68 F02F 5/00 B21F 37/02

Claims (1)

(57) [Claims 1] The unwinding and winding of the wire in the processing step of finally forming the wire into a deformed cross-section and the subsequent processing are the same from the reel having flanges at both ends. To the reel, the unwinding, the reel with the horizontal axis,
And rows that have while maintaining a tight state, the winding is, both ends
It is a substantially uniform spiral except for the upper part,
Intersect and roll in with a gap in the width direction substantially in one layer
A method for producing a deformed steel wire rod for a piston ring of an internal combustion engine, comprising: