JP5804343B2 - Molding device for deformed wire rod for piston ring - Google Patents

Description

  The present invention relates to a deformed wire forming apparatus suitable for forming a deformed cross-section wire used for, for example, an engine piston ring.

In order to meet the recent demands for higher engine speed and higher output, high-load piston rings have been changed from conventional cast iron to steel, and special steels such as high alloy stainless steel are now being used. .
The piston ring includes an oil ring having a pseudo H-shaped cross section, a side rail, a spacer, and a pressure ring having different cross-sectional shapes on the left and right sides, each having a deformed cross section. Among these piston rings, oil rings having a complicated H-shaped cross section are used, and strict dimensional accuracy is required for the piston ring wire material.

Currently, such a deformed cross section piston ring wire is formed, for example, as disclosed in Patent Document 1, after forming a round wire into a rectangular wire, a non-driven front four-way roll turks head, and a power drive It has been proposed to form a molding unit that is combined with the latter four-way roll turks head by a molding apparatus in which a single unit or a plurality of units are arranged in tandem.
This proposal can be greatly improved by forming the process separately from 3-5 times and performing the stress relief annealing in the middle, omitting or reducing the intermediate stress relief annealing once or twice. It is excellent in that the efficiency can be improved and the cost can be reduced.
However, if a material with bending or twist remaining in the wire rod is formed into a deformed wire rod in the state of being formed into a rectangular wire in the previous process, the filling state of the roll hole mold is in the state of being bitten into the four-way roll stand or during rolling. There was a problem that it became non-uniform and was not molded into a predetermined shape.
The inventor proposes that the bending generated in the wire before and after the forming of the deformed wire can be solved by forming with a deformed wire forming apparatus having levelers at the front and back of the forming unit composed of a four-way roll stand. (Patent Document 2).

JP 2003-39103 A JP 2010-2014492 A

The forming apparatus disclosed in Patent Document 2 described above is advantageous in that it can solve the bending that occurs in the wire before and after forming the deformed wire.
However, for example, the surface of the wire formed into a rectangular wire in the previous process, the wire after peeling, the wire after annealing, and the material surface of the wire after drawing, cause contamination such as drawing lubricant, furnace deposits, etc. If a material having foreign matter adhered thereto is formed into a deformed wire by rolling, the foreign material may be caught on the surface of the deformed wire and wrinkles may be generated on the surface of the deformed wire. Further, when the material bites into the four-way roll stand, foreign matter may adhere to the roll surface. If rolling is performed with foreign matter attached to the roll surface, the filling state of the wire rod into the roll hole mold becomes non-uniform, and there is also a problem that it is not formed into a predetermined shape with high accuracy.
In addition, when a wire with discontinuous foreign matter attached to the surface of the raw material wire is caught in a power-driven 4-way roll stand, the friction state between the roll and the wire changes locally due to the foreign matter. May occur. Due to this roll slip, there is a problem that seizure flaws of the roll occur on the surface of the wire after forming the deformed wire. These problems greatly affect the formability of the deformed wire and the quality of the wire after forming.

  An object of the present invention is to provide a molding apparatus that can solve the problem of foreign matter adhesion due to contamination on the surface of a material and obtain a deformed wire with high dimensional accuracy that is excellent in moldability and surface cleaning.

  The present inventor examines the problem of dimensional accuracy of deformed wire and adopts a cleaning device that cleans the surface of the material before forming, thereby greatly improving the surface cleaning and dimensional accuracy problems that occur after forming the deformed wire. And reached the present invention.

That is, the present invention is a deformed wire forming apparatus having a four-way roll stand as a forming unit, and a deformed wire forming apparatus in which a cleaning device for cleaning the surface of the wire is disposed in the foremost stage of the forming unit. .
The cleaning device preferably cleans the surface of the wire with a solvent, and more preferably cleans the solvent by applying ultrasonic vibration.
In the molding unit, a non-driven four-way roll stand and a power-driven four-way roll stand are preferably arranged in tandem.
In the molding unit, it is preferable that a plurality of non-driven four-way roll stands and a power-driven four-way roll stand are arranged in tandem.
Moreover, it is preferable that a finishing unit composed of one or a plurality of non-driven four-way roll stands is disposed at the last stage of the forming unit.

  According to the present invention, by arranging the cleaning device in the forefront of the molding unit composed of a four-way roll stand, problems of surface cleaning and dimensional accuracy that occur after molding of the irregular shaped wire can be greatly improved, such as a piston ring. The production of the deformed wire used in the process can be dramatically improved.

It is a figure which shows an example of the shaping | molding apparatus of the unusual shaped wire of this invention. It is a figure which shows the cross section of the deformed wire shape | molded in the Example. It is a figure which shows an example of the washing | cleaning apparatus with which the shaping | molding apparatus of the unusual shaped wire of this invention is equipped. It is a figure which shows another example of the shaping | molding apparatus of the unusual shaped wire of this invention. It is a figure which shows another example of the shaping | molding apparatus of the unusual shaped wire of this invention.

The most important feature of the present invention resides in that a cleaning device for cleaning the surface of the wire material is disposed in the forefront of the molding unit composed of a four-way roll stand.
As described above, dirt such as drawn lubricant and furnace deposits may adhere to the surface of the wire before being formed into a deformed wire. If the cross-sectionally shaped wire rod is formed with foreign matter such as dirt adhered to the surface of the material wire rod, problems such as a problem of dimensional accuracy and induction of wrinkles on the surface of the deformed wire rod arise. This is a particularly serious problem when forming a deformed wire rod that is used for, for example, a piston ring or the like and requires a very high dimensional accuracy by a four-way roll stand.
In order to obtain a predetermined irregular cross-sectional shape and surface cleaning, it is important that the surface of the material is always uniformly cleaned. Therefore, in the deformed wire molding apparatus of the present invention, a cleaning device for cleaning the surface of the wire is disposed in the forefront of the molding unit composed of a four-way roll stand.

  The cleaning apparatus for cleaning the surface of the wire that can be applied with the deformed wire forming apparatus of the present invention includes a mechanical system using a brush or the like, a physical system using a laser or the like, and a chemical system using a solvent such as a cleaning liquid. These cleaning methods can be appropriately selected according to the shape and dimension of the deformed wire to be manufactured, and may be performed in combination, for example, using a mechanical method and a chemical method in succession.

In the deformed wire molding apparatus of the present invention, the cleaning apparatus installed in the forefront of the molding unit preferably uses a chemical method using a solvent such as a cleaning liquid. As a solvent used in the chemical method, water and warm water (typically 30 ° C. or more) can be used in addition to the solvent. Among them, warm water has little influence on the human body and is easy to handle such as supply and disposal. In addition, foreign matters such as dirt adhering to the surface of the wire are often extraction lubricants mainly composed of metal soap attached in the previous process, and this extraction lubricant is easily dissolved in hot water. It is most preferable to use warm water as the solvent.
In addition, the cleaning apparatus applied in the present invention is preferably provided with an ultrasonic vibrator in the cleaning tank as an auxiliary mechanism for promoting the cleaning effect, and applying ultrasonic vibration to the solvent. The cleaning effect can be further enhanced.

FIG. 3 shows an example of a cleaning apparatus that can be applied to the deformed wire molding apparatus of the present invention. As the cleaning device, for example, a device that removes foreign matters such as dirt on the surface of the wire by immersing the solvent in a cleaning tank surrounded by an overflow tank and allowing the wire to pass through the solvent as shown in FIG. 3 is suitable. .
The cleaning device shown in FIG. 3 has a valve-equipped water distribution pipe 38 attached to the bottom surface of the overflow tank 31 in order to facilitate discharge when the solvent is exchanged. The overflow tank 31 and the cleaning tank 30 are provided with slits for allowing the wire to pass through part of the front and back surfaces. The solvent that has flowed out from the gap between the slits of the cleaning tank 30 accumulates in the overflow tank 30 and returns to the cleaning tank 30 again by a pump 37 provided in the overflow tank 30. Further, an ultrasonic vibrator 32 is installed on the bottom surface in the cleaning tank 30 so that ultrasonic vibration can be applied to the solvent. The adjustment of the ultrasonic vibration can be adjusted by the output of the ultrasonic oscillator 33.
Further, it is preferable that a wipe or a cloth 34 is installed at the slit outlet of each of the washing tank 30 and the overflow tank 31 to wipe off dirt and solvent adhering to the wire. Moreover, it is preferable to install an air wiper 35 for removing the solvent adhering to the wire on the outlet side of the overflow tank 31.
In order to pass the wire at a predetermined level of the solvent in the cleaning tank 30, it is preferable to provide a lift 39 that can adjust the height of the cleaning tank 30.

An example of the apparatus for forming a deformed wire of the present invention is shown in FIG. As shown in FIG. 1, in the example of the deformed wire molding apparatus of the present invention, an accumulator dancer roll 7 and a cleaning device 2 are arranged immediately after the unwinding machine 1, and a non-driven 4 is formed as a molding unit in the subsequent stage. Two units are arranged in tandem with a one-way roll stand 3 and a power-driven four-way roll stand 4, and a finishing unit 5 consisting of a non-driven four-way roll turk stand, a double capstan 9, and a winder 6 are arranged at the subsequent stage. The configuration is as follows.
The accumulator dancer roll 7 arranged between the unwinder 1 and the cleaning device 2 and the dancer roll 8 arranged between the power-driven four-way roll stand 4 and the finishing unit 5 keep the tension between them constant. In addition, the number of revolutions of the unwinding machine 1 and the power-driven four-way roll stand 4 arranged immediately before is controlled.

In the example of the deformed wire rod forming apparatus shown in FIG. 1, only one stage of the non-driven four-way roll stand 3 is arranged as a former unit, but two or more non-driven four-way roll stands are arranged. can do. In addition, the power-driven four-way roll stand 4 at the rear stage is arranged in only one stage, but two or more power-driven four-way roll stands can be arranged.
In addition, the molding unit can be arranged in a tandem with a plurality of non-driven four-way roll stands 3 and power-driven four-way roll stands 4. Moreover, although the finishing unit 5 which consists of a non-driving four-way roll stand is arrange | positioned only 1 step | paragraph, two or more non-driving four-way roll stands can be arrange | positioned.
Further, in the example of the deformed wire forming apparatus shown in FIG. 1, only a four-way roll stand is arranged. However, the deformed wire forming apparatus of the present invention includes a pair of upper and lower or left and right two-way roll stands as a forming unit. You may arrange | position between.

  FIG. 4 shows another example of the apparatus for forming a deformed wire according to the present invention. As shown in FIG. 4, in the deformed wire forming apparatus of the present invention, an accumulator dancer roll 7 and a cleaning device 2 are arranged at the subsequent stage of the unwinder 1, and a non-driven four-way roll stand 3 is arranged at the subsequent stage. Three units of tandem molding units that are arranged in tandem with a power-driven four-way roll stand 4 are arranged in tandem, and a non-driven four-way roll stand 3 is arranged after each molding unit. Two units of finishing units 5 may be arranged in tandem at the subsequent stage, and a double capstan 9 and a winder 9 may be disposed at the subsequent stage. By arranging the molding unit in this way, oil ring wire, side rail wire, spacer wire and pressure ring wire can be formed with high dimensional accuracy, and it is most suitable for forming oil ring wire. is there.

  Moreover, another example of the shaping | molding apparatus of the unusual shaped wire of this invention is shown in FIG. As shown in FIG. 5, in the deformed wire rod forming apparatus of the present invention, the accumulator dancer roll 7 and the cleaning device 2 are disposed at the subsequent stage of the unwinder 1, and the non-driven four-way roll stand 3 and the power are disposed at the subsequent stage. Three units of tandem molding units are arranged in tandem with the four-way roll stand 4 for driving, and five units of finishing units 5 are arranged in tandem at the subsequent stage, and the double capstan 9 is wound on the subsequent stage. A configuration in which the machine 6 is arranged may be adopted. By arranging the molding unit in this way, oil ring wire, side rail wire, spacer wire and pressure ring wire can be formed with high dimensional accuracy, and is most suitable for forming pressure ring wire. is there.

It is preferable that the non-driven four-way roll stand 3 and the power-driven four-way roll stand 4 are arranged in tandem in the forming unit in the deformed wire forming apparatus of the present invention.
By using the non-driven four-way roll stand 3 for the forming unit, the rolling reduction can be reduced, and as a result, the rolling load is also reduced. Thereby, since the reaction force with respect to the four-way roll stand from a wire becomes small, it can roll in the area | region where there is little deformation amount of a four-way roll stand. By rolling in a region where the deformation amount of the four-way roll stand is small, it is possible to suppress dimensional variations due to roll runout, and thus it is possible to form a deformed wire with high dimensional accuracy.
Further, by using the power-driven four-way roll stand 4 for the forming unit, it is possible to reduce the front tension applied to the deformed wire from the winder side. As a result, the forward tension does not increase even if the rolling reduction is increased as compared with the non-driven four-way roll stand 3, so that the dimensional fluctuation (reduction) and breakage due to the elongation of the wire can be suppressed, and the roll hole type can be achieved. A high filling rate can be secured.

The forming unit in the deformed wire forming apparatus of the present invention preferably has a plurality of non-driven four-way roll stands 3 and power-driven four-way roll stands 4 arranged in tandem. Thereby, it is possible to reduce the rolling reduction per one of the four-way roll stands, and to reduce wear and breakage of the rolls.
In addition, by arranging a plurality of forming units in tandem, the wire rod can be formed with a pass schedule that gradually brings the hole shape of the roll closer to the product shape, and the wire flow can be reduced without hindering the metal flow of the wire. Molding can be done. Thereby, a deformed wire with high dimensional accuracy can be formed, and the number of rolling operations and intermediate annealing can be omitted.

In the deformed wire rod forming apparatus of the present invention, it is preferable that a finishing unit 5 including a single or a plurality of non-driven four-way roll stands is disposed at the last stage of the forming unit arranged in a plurality of units in the tandem. In order to obtain a deformed wire with high dimensional accuracy, it is necessary to lightly reduce the final stage. When a power-driven four-way roll stand is placed at the final stage and formed with a reduced rolling reduction, roll slip may occur due to the driving force of the power-driven four-way roll stand, which may cause wrinkles in the deformed wire. There is. For this reason, by using the finishing unit 5 composed of a non-driven four-way roll stand that is not affected by the driving force, roll slip can be suppressed even if the rolling reduction is kept low, and a deformed wire with high dimensional accuracy without wrinkles can be formed. can do.
Further, by using a non-driven four-way roll stand for the finishing unit 5, the rolling reduction can be reduced and the rolling load is also reduced. Thereby, since the reaction force with respect to the four-way roll stand from a wire becomes small, it can roll in the area | region where the rigidity of a four-way roll stand is low. By rolling in a region where the rigidity of the four-way roll stand is low, dimensional fluctuation due to roll run-out can be suppressed, so that a deformed wire with higher dimensional accuracy can be formed.

  As shown in FIG. 1, an accumulator roll 7 and a cleaning device 2 are arranged in the subsequent stage of the unwinder 1, and a non-driven four-way roll stand 3 and a power-driven four-way roll stand 4 are arranged in tandem in the subsequent stage. Two units were arranged in tandem, and the subsequent stage was rolled by using a deformed wire rod forming apparatus in which a finishing unit 5 consisting of a non-driven four-way roll stand, a double capstan 9 and a winder 6 were arranged. . As the material, 0.8% C-17% Cr steel (mass%) having a diameter of 5.0 mm was used, and a deformed wire having a thickness of 3.07 mm and a width of 4.07 mm as shown in FIG. 2 was formed. . At this time, the passing speed of the cleaning device 2 was set to 30 m / min.

As shown in FIG. 3, the cleaning device 2 has a length 450 mm, a width 350 mm, and a depth surrounded by an overflow tank 31 having a length of 800 mm, a width of 600 mm, and a depth of 200 mm on an elevator 39 that can adjust the height. A 300 mm cleaning tank 30 was disposed, and an ultrasonic transducer 32 was installed on the bottom surface of the cleaning tank 30. The washing tank 30 was filled with hot water of 40 to 45 ° C. as a solvent. At this time, a slit for allowing the wire to pass through was provided in part of the front and back surfaces of the overflow tank 31 and the cleaning tank 30. The hot water flowing out from the gap between the slits of the cleaning tank 30 is accumulated in the overflow tank 30 and returned to the cleaning tank 30 again by the submersible pump 37 provided in the overflow tank 30. A water distribution pipe 38 with a valve was attached to the bottom surface of the overflow tank 31.
Further, a wiping paper 34 was installed at each of the slit outlets of the cleaning tank 30 and the overflow tank 31 to wipe off dirt and cleaning liquid adhering to the wire. An air wiper 35 was installed on the outlet side of the overflow tank 31 to remove hot water adhering to the wire.

If a deformed wire is formed without using the cleaning device 2 at all in the deformed wire forming apparatus of FIG. 1, the surface of the deformed wire is thought to be due to indentation of foreign matters such as dirt, 2 mm wide, 20 mm long, deep. Several bites of about 5 μm were confirmed.
On the other hand, the surface of the deformed wire formed using the cleaning device 2 of the present invention was free of biting flaws due to the pressing of foreign matters such as dirt, and the effectiveness of the present invention was confirmed.

1. Unwinder, 2. 2. cleaning device; Non-driven 4-way roll stand, 4. 4. Power-driven 4-way roll stand, Finishing unit, 6. 6. Winding machine, Accumulator dancer roll, 8. Dancer roll, 9 Double capstan, 30. Washing tank, 31. Overflow tank, 32. Ultrasonic transducer, 33. Ultrasonic oscillator, 34. Wipe paper, 35. Air wiper, 37. Submersible pump, 38. Water distribution pipe with valve, 39. Lifting cart

Claims (1)

In the device for forming a deformed wire for a piston ring, which is formed by deforming the wire unwound from the unwinder and winding it with a winder,
  An accumulative dancer roll arranged in a subsequent stage of the unwinding machine;
  A cleaning device disposed downstream of the accumulator dancer roll;
  A molding part having a different shape with respect to the wire disposed in a subsequent stage of the cleaning device;
  A finishing unit disposed at a subsequent stage of the molded part;
  A double capstan disposed downstream of the finishing unit;
  The winder disposed behind the double capstan; and
  The molding part is configured by arranging a plurality of tandem molding units in which a non-driven four-way roll stand and a power-driven four-way roll stand are arranged in tandem,
  The cleaning device includes a cleaning unit that applies ultrasonic vibration to a solvent to clean the surface of the wire, and a wipe or a wipe that wipes off dirt and solvent adhering to the cleaned wire. An apparatus for forming a deformed wire rod for a piston ring.