JP2864331B2 - Continuous processing equipment for metal wire or metal tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a metal wire or a metal tube,
More particularly, the present invention relates to a technology for continuously reducing the cross-section of wires and pipes such as hard-to-machine metals, deformed cross-section metals, and composite materials.

[0002]

2. Description of the Related Art In order to continuously reduce the cross-sectional area of a metal wire, a drawing method in which the metal wire is wound around a rotary drum through a die having a predetermined diameter is generally used.
It is necessary to arrange a number of combinations of dies and winding machines in order to reduce the surface area by 1% and to make the material thinner, and the equipment is complicated and large-scale. In addition, there are many problems, such as the fact that materials with low ductility must be subjected to drawing and annealing alternately.

On the other hand, as a simpler means than the above means, there is known a conform extrusion method in which a non-ferrous soft metal such as aluminum is continuously extruded by utilizing a frictional force. A material pressing mechanism of this means is called a shoe. The main component is a member using an integral high-strength metal material. However, such an integral shoe requires a large amount of processing and heat treatment, and if a part of the shoe causes local wear, the entire shoe must be replaced and the contact length of the material cannot be changed. Had the disadvantage of becoming longer. Further, the integral shoe has high rigidity, and the pressing force fluctuates according to the fluctuation of the material, which may cause unstable work.

Further, in this method, the material is crushed to fill the gap between the wheel and the shoe, and the frictional force generated by maintaining this under a large hydrostatic pressure is used. It is necessary to apply a large pressing force, and the pressing mechanism becomes large. Therefore, it becomes extremely difficult for a material having a high yield stress such as a steel wire. In addition, in this method, there is a material storage portion in the die, and in this portion, a dead metal, that is, a material that is stagnant in the die and is not extruded, is formed,
The material is softened using the frictional heat generated between the dead metal and the material flowing into the die,
Although such a method is possible for non-ferrous soft metals such as aluminum, the dies and shoes cannot be tolerated if this method is applied to a material such as steel wire which cannot give a sufficient pressing force against the yield stress of the material.

On the other hand, Japanese Patent Application Laid-Open No. Sho 59-42115 discloses a drawing machine which can apply such means to steel wires. That is, according to the invention, the rotationally driven wheel has a base angle of 40 ° to 90 ° at which the processed steel wire fits on the outer peripheral portion.
It has a V-shaped or trapezoidal shaped wheel groove,
The shoe for pressing the steel wire against the wheel groove is divided into a plurality of segments having a pressing mechanism, and a die is formed adjacent to the end of the shoe, and a winder is installed in front of the die to rotate the wheel. A continuous drawing machine for a steel wire, characterized in that a continuous working of the steel wire can be performed by a pushing force generated by pressing of the shoe and a shoe and a drawing force of a winding machine. Further, Japanese Patent Laid-Open No.
No. 229615 discloses an apparatus in which, instead of the above-described winding machine, two pulling-out devices are provided, which alternately sandwich a material and move by a certain distance. However, this method, together with the above-mentioned method, has a large pressing force from the fixed shoe in the wheel rotating part, so that the material is likely to have pressing flaws, and there is energy loss due to sliding with the fixed shoe. However, problems such as wear of the shoe due to frictional heat are inevitable.

On the other hand, Japanese Patent Application Laid-Open No. Hei 3-254431 discloses a method in which a pair of endless orbital connecting rotating shoes are used for a pushing mechanism and a pulling mechanism, and a material flaw or fixing is caused by a reduction in pressure due to the use of contact friction on both sides of the material. The problem of shoe wear was solved, and energy loss due to friction was avoided. However, in this method, since the material grasping part of the endless track that gives forward tension is long, at the start of processing, a pre-applied part with a diameter approximately equal to the diameter of the die hole is added to the tip of the material to a very high precision dimension in advance. Preparatory work requires a great deal of time and effort because it must be processed.

Further, since the contact state of the endless track grasping portion is strongly or weakly hit by a portion and the tension is likely to be unstable, it is required that the entire machine has extremely high manufacturing accuracy and control accuracy. become. Moreover,
Since the gripping portion is very long, replacement due to wear of the connecting rotary shoe becomes a serious task. In addition to this, the device for applying the forward tension is large, and the cost required for maintaining the equipment cannot be ignored. In the case of drawing out in an endless track, when it is necessary to wind the processed product around a coil, a winding machine must be separately provided, and the line becomes long and complicated. Also, Japanese Patent Application Laid-Open No. Hei 3-254431 discloses a method in which a rotary wheel is used to push a rotary wheel and pull it out by an endless track.
Similar to No. 15, there are inherent problems such as pre-installation, wheel flaws, and shoe wear.

[0008]

SUMMARY OF THE INVENTION According to the present invention, in order to produce a product in which the cross-sectional area of a linear or tubular material is greatly reduced continuously, the complicated pre-installation process which is an obstacle to the production, the enlargement of equipment, etc. To solve the above problem.

[0009]

That is, according to the present invention, a material pressurized and held by a pair of connecting shoes which are rotated and driven by providing a cylindrical portion which partially moves parallel to the die axis behind the center axis of the die hole type. While having a mechanism to insert and press into the die,
A die is formed adjacent to the end of the parallel portion of the shoe, and a material that has passed through the die has a mechanism for applying a pulling force at a predetermined speed by a winder, and these pushing and pulling are simultaneously applied to the material. At this time, a mechanism that controls the indentation force to a predetermined constant value of 0.2 to 1.0 times the yield load of the material before processing, or the pulling force is 0.2 times the yield load of the material after processing And a device for continuously processing a metal wire or a metal tube capable of reducing the cross section of a material, comprising a mechanism for controlling the material to a predetermined constant value of 1.0 to 1.0, Accordingly, the present invention provides a metal wire or metal pipe continuous processing device provided with a water cooling pipe in a die or a mechanism for cooling the entire die with water or a water-soluble lubricant.

[0010]

The present invention will be described below in detail. FIG. 1 shows an embodiment of the wire rod processing equipment according to the present invention. Material 1
Is introduced onto the axis 3 of the die 2 and is pressed and held by a pair of connecting shoes 7a and 7b provided in the pushing equipment 6, and the connecting shoe is driven to rotate, so that the die block 5 is passed through the die guide 5. The dies 2 supported by the dies 4 are pushed with a predetermined constant load. Further, the blank 1 is subjected to additional forward tension by the winder 14 in front of the die.

In the pushing equipment 6, one connecting shoe 7a is pressed by a hydraulic cylinder 9 via a friction reducing element such as a roller conveyor, and the other connecting shoe 7b is also driven by a reaction force plate 10 via a roller conveyor or the like. It is structured to be supported by. This is a mechanism for applying a force for pinching and pushing the material 1 from behind by holding the material 1 under pressure. The driving force in this case is such that the energy of the motor 13 is
A pair of connecting shoes 7 via sprockets 8a and 8b
a, 7b is given to the material 1 by rotating and driving. Therefore, the pushing force behind the working die 2 is given to the material 1 by the frictional force generated between the material 1 and the pair of connecting shoes 7a, 7b.

If a mechanism for controlling the pressure by the hydraulic cylinder 9 or the like is provided, the material 1 and the connecting shoes 7a, 7
It is possible to provide a necessary and sufficient frictional force for pushing in between the member b. The pushing equipment 6 can give a constant pushing force by measuring the current of the drive motor 13 itself to the material or controlling the movement of the motor while measuring the torque required for processing. The reason why the indentation force is set to 0.2 times or more of the yield load of the raw material before processing is that if it is less than that, it is impossible to perform a large area reduction process or to enhance the mold filling of the deformed die. The reason for setting the load not more than 1.0 times is to avoid problems such as material buckling behind the die when the load is larger than the load.

If the winding machine 14 is operating at a required speed, if the press-in side always shares a certain amount of the work required for material processing as described above, the winding machine 14 is inevitably left. Almost constant work will be shared, and stable operation will be possible. On the other hand, if a mechanism for controlling the pulling force to a constant value is provided, the remaining work is shared by the pushing side, and substantially the same stable operation is possible. The pulling force can be made constant by, for example, controlling the movement of the motor while measuring the torque of the winder.

At this time, the reason why the drawing force is set to 0.2 times or more of the material yield load after working is that if it is less than that, large surface reduction processing cannot be performed in combination with indentation.
The reason for setting it to 0 times or less is that if it exceeds that, the risk of disconnection during processing increases.

As described above, when the winding machine is used in the drawing portion, the pre-applied length of the material is much shorter than that in the case of drawing in the endless track, and the whole material is sandwiched because only a part of the material is sandwiched. Compared to the case of the endless track, it is possible to apply a stable pull-out force that is less affected by the fluctuation of the wire rod diameter. At the beginning of the work, grab the material with a chuck with claws as if you were working on a draw bench,
A method of working through the dies by a necessary length until it can be set on the winding machine in conjunction with the pushing device is effective for greatly shortening the leading portion.

With such a device, a large reduction in surface area can be achieved by a combination of a pushing force and a pulling force, so that heat generated by deformation of the material and heat generated by friction between the material and the die cannot be ignored. In such a case, the durability of the die can be greatly improved by providing a water cooling pipe in the die or cooling the entire die. If the die guide 5 is set before entering the die 2 in FIG. 1, the material can be easily introduced. According to the present invention, not only a large cross-section reduction process can be performed on a material, but also a complicated cross-section can be easily processed.

[0017]

EXAMPLE The material used was a coil of a solid S48C rolled wire having a circular cross section with a diameter of 9.6 mm, and a metal film soap was added to a phosphate film for lubrication. The length of the material grasping portion of the connecting shoe of the pushing mechanism was 1012 mm, and the material was sandwiched by a hydraulic cylinder with a load of 9.7 tonf. Therefore, first, when controlling the pushing force, the torque of the sprocket is controlled so that a constant pushing force of 2.9 tonf is applied to the material behind the die. On the other hand, when controlling the pulling force, a constant pulling force of 0.95 tonf was applied by controlling the torque of the winder motor.
The peripheral speed of the connecting shoe of the pushing equipment was 12 m / min. The dies were made of carbide and the material was processed to a diameter of 5.7 mm. As a result, the material reduction rate was 6 in both conditions.
Achieved 7.2%. On the other hand, in the conventional drawing process, the same processing could not be performed unless the process was repeated three times, and a cap peak crack was generated in the third drawing, so that a product could not be manufactured. Moreover, compared to the conventional case where the endless track is used on the drawing side, the equipment cost can be reduced to about half, and the time required for setting up a new machining is reduced to about one third of the conventional case.

[0018]

According to the present invention, when the cross-sectional area of a metal wire or a metal tube is significantly reduced, the present invention can control the pushing load behind the material or the pulling load in front of the material, thereby preventing buckling of the material. At the same time, the pull-out force is stable and tensile fracture is prevented, and a large cross-sectional area reduction rate can be stably given by superimposition of the pushing load and the tensile load. In addition, compared to the case of pulling out with an endless track, the material grasping part is short and simple, so the pre-installed length can be shortened, the time for material replacement is significantly shortened, and the productivity and material yield are large. In addition, in the case of coil product processing, there is no need to provide a winding machine separately from the drawing machine, so that a significant reduction in line length and equipment cost can be achieved. Further, unlike the rotating wheel type, there is no fear of scratching the material, and the processed product has excellent mechanical properties such as fatigue.

And, compared with the conventional repeated drawing,
This eliminates the need for repetitive operations such as annealing, scale removal, pre-installation, and die replacement, greatly improving productivity and making the equipment layout extremely compact. In addition, since the stress generated in the material during processing is mainly composed of compressive stress, the material of the finished product is much better than the case of repeated drawing, and in addition, the shape of the complex shaped irregular cross section appears. It is easy to manufacture a product that has been manufactured by repeated drawing, but it can be manufactured with a much smaller number of steps, and thus it is possible to manufacture a product having a complicated shape that has been considered impossible to manufacture. Furthermore, these effects appear more remarkably in the large-area reduction processing enabled by the present invention. When used to reduce the cross-sectional area of a composite material in which the outer layer and the inner portion are made of different materials, a strong pressure acts on the boundary surface during processing and a strong bonding force is obtained due to a high cross-sectional reduction rate. . As described above, according to the present invention, not only the efficiency can be improved but also a product that cannot be processed by the conventional technology can be manufactured.

[Brief description of the drawings]

FIG. 1 illustrates an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Material 2 Dice 3 Dice axis 4 Dice block 5 Dice guide 6 Push-in equipment 7a, 7b Connecting shoe 8a, 8b Sprocket 9 Hydraulic cylinder 10 Reaction plate 11 Power transmission gear 12 Reduction gear 13 Motor 14 Winding machine

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Takanari Miyagi 12 Nakamachi, Muroran-shi, Hokkaido Nippon Steel Corporation Muroran Works (72) Inventor Teruo Kawabata 12 Nakamachi, Muroran-shi, Hokkaido Nippon Steel Corp. (56) References JP-A-3-254311 (JP, A) JP-A-7-124629 (JP, A) JP-A-2-22413 (JP, A) (58) Fields investigated ( Int.Cl. ⁶ , DB name) B21C 1/00 B21C 3/00

Claims (2)

(57) [Claims] A mechanism is provided which is provided behind the central axis of the die hole mold and which partially moves in parallel with the axis, and which has a mechanism for pressing and holding the material pressed and held by a pair of connecting shoes which are driven to rotate into a die. A die is formed adjacent to the end of the parallel part of the shoe, and a mechanism that applies a pulling force at a predetermined speed to the material passing through the die by a winder is used to simultaneously apply these pushing and pulling to the material. ,
A mechanism for controlling the indentation force to a predetermined constant value of 0.2 to 1.0 times the yield load of the material before processing, or the pulling force is 0.2 to 1 times the yield load of the material after processing. A mechanism for controlling the cross section of the material to a predetermined constant value of 0.0 times;
Continuous processing equipment for metal wires or metal tubes. 2. A die is provided with a water cooling pipe in the die or a mechanism for cooling the whole die with water or a water-soluble lubricant.
The apparatus for continuously processing a metal wire or a metal pipe according to claim 1.