JPH07124629A - Working machine imparting thrust and drawing to metallic rod - Google Patents

Abstract

PURPOSE:To obtain a machine by which a metallic rod or tube is continuously reduced in cross-section and worked into a desired shape. CONSTITUTION:The machine is provided with a mechanism 6, which holds and thrusts a base material 1 in a die 2 by a pair of connecting shoes 7a, 7b, and also a drawing mechanism 14 which, after clamping the base material 1 passed through the die 2, moving for a specified distance and releasing the material 1, returns to its original position and repeats the same operation. In imparting the thrusting and drawing simultaneously to the base material 1, the drawing force is controlled to the preliminarily decided specific value that is 0.2 time to 1.0 time of the yield load of the work-finished material, the drawing mechanism 14 is provided with a through-throat for the base material as well as a chuck for fully holding the working material on the inside circumferential surface, and the drawing force is imparted to the metallic rod 1. Thus, not only a large reduction working is easily performed on a base material, but also the pointing part is made short, and the time for exchanging the material is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for applying a force for pinching and pushing a metal rod or a metal tube, particularly a difficult-to-process metal, a metal having an irregular cross section, or a composite material to the material metal rod and a die front. The present invention relates to a device for reducing the cross-section and processing into a desired shape by combining with a mechanism for applying a force of sandwiching and drawing to a processed metal rod.

[0002]

2. Description of the Related Art Conventionally, in order to continuously thin a metal rod, a drum winding method in which a metal rod is drawn through a die having a predetermined diameter to the front side of the die is generally used. Since it is reduced by each, it is necessary to combine several dies and a winder for drawing in order to process the material more thinly, and if the wire breaks during operation, there will be a marked decrease in productivity. In addition, since the equipment is complicated and large-scale, it requires a great deal of skill to adjust the work, and it has many problems such as having to perform drawing and annealing alternately for a material with low ductility. .

On the other hand, as a simpler means than the above means, for example, Japanese Unexamined Patent Publication No. 59-42115 discloses a drawing machine which can be applied to a steel wire. That is, according to the present invention, a wheel driven to rotate has a V-shaped or trapezoidal-shaped wheel groove having a groove bottom angle of 40 ° to 90 ° into which a machined steel wire fits on the outer peripheral portion thereof. The shoe to be pressed against is divided into multiple segments with a pressing mechanism, and a die is formed adjacent to the end of the shoe, and the winder is installed in front of it to rotate the wheel and press the shoe. The continuous drawing machine for steel wire is characterized in that the steel wire is continuously machined by the pushing force and the drawing force of the winding machine. The difficulty in this case is that when the steel wire is wound as a product on a winder for giving a drawing force after processing, it is necessary to straighten it by leaving the bending habit as it is when it is linearly used later. Come on.

Further, in Japanese Patent Laid-Open No. 2-229615, instead of the above-mentioned winding machine, there is shown one in which two drawing devices for alternately sandwiching the material and moving it by a predetermined distance are installed. However, with this method, in addition to the above-mentioned method, pressing flaws are likely to occur on the material, and there is sliding with the fixed shoe, so there is energy loss,
Problems such as shoe friction due to frictional heat generation cannot be avoided.

On the other hand, in Japanese Patent Laid-Open No. 3-254311, a pair of endless track connecting rotary shoes are used for the pushing mechanism and the pulling mechanism, and the pressure is reduced by utilizing the contact friction on both sides of the material. It also solves the problem of friction between and fixed shoes, and also avoids energy loss due to friction. However, in this method, since the material grasping part of the endless track that gives the forward tension is long, a tip part with a diameter almost equal to the die hole diameter is prepared at the beginning of the material at the start of processing to a highly accurate size beforehand. Since it has to be processed, the preparation work requires a lot of time and labor.

Further, since the contact state of the endless track grasping portion is strongly hit or weakly hit depending on the part, the tension generation is likely to be unstable, so that the whole machine is required to have very high manufacturing accuracy and control accuracy. become. Moreover,
Since the grasping portion becomes very long, replacement of the connecting rotary shoe due to wear becomes a difficult task. In addition to these, the device for applying the forward tension is large, and the cost required for manufacturing and maintaining the equipment cannot be ignored.

Further, Japanese Laid-Open Patent Publication No. 3-254311 discloses a method of pushing in with a rotary wheel and pulling out with an endless track.
Similar to No. 1 publication, the problem of pre-positioning and material defects due to wheels,
There are inherent problems such as shoe friction.

[0008]

DISCLOSURE OF THE INVENTION The present invention not only facilitates the process of continuously reducing the cross section of a metal rod or metal tube and processing it into a desired shape, but also shortens the work time for material replacement. It is intended to provide a processing device.

[0009]

DISCLOSURE OF THE INVENTION According to the present invention, a die is formed by holding a material under pressure by a pair of connecting shoes that are rotationally driven behind a central axis of a die hole type and provided with a portion that moves in parallel with the central axis. While having a mechanism for pinching and pushing, forming a die adjacent to the end of the parallel part of the shoe, pinching the material that has passed through it and moving it for a certain distance, then releasing the material and returning to the original position, It has a drawing mechanism that repeatedly operates the same thing again, and when applying these pushing and drawing simultaneously to the material, the pushing force is predetermined to be 0.2 times to 1.0 times the yield load of the material before material processing. A mechanism for controlling a constant value or a mechanism for controlling a pulling force to a predetermined constant value of 0.2 to 1.0 times the yield load of the material after processing, Add push and pull to a metal rod That the processing unit and, together with the device, which is the main part material pinching portion center of withdrawal mechanism,
The pulling mechanism has a material penetrating throat when it repeatedly moves, and a chuck is provided on the inner peripheral surface of the penetrating throat to sufficiently pinch the material to be processed, and if necessary, the material is pinched to move a certain distance. The present invention provides a processing device that is provided with a device that cuts a material that has been processed by the above method into a required length and that imparts pushing and drawing to a metal rod.

[0010]

FIG. 1 shows an embodiment of the metal rod processing equipment according to the present invention. The material 1 is on the axis 3 of the die 2, and has a pair of connecting shoes 7a provided on the pushing mechanism 6.
7b is pressed and held, and further, by being rotationally driven, the connecting shoe is pushed through the die guide 5 to the die 2 supported by the die block 4 with a predetermined constant load. Further, the material 1 is provided with an additional front tension by the drawing mechanism 14 in front of the die. The pull-out mechanism 14 comprises a pull-out guide table 17 and a pull-out reciprocating body 15. The pull-out reciprocating body 15 is provided with a material penetrating throat 16 at the center of the shaft, and the work material 1 is formed on the inner surface of the penetrating throat.
It has a chuck for fully sandwiching, and after moving a certain distance, the material is released, returned to the original state, and the material is pulled out from the die while repeating the same process.

In the pushing mechanism 6, one connecting shoe 7a is pressed by the hydraulic cylinder 9 via a friction reducing element such as a roller conveyor, and the other connecting shoes 7b are also reacted by the reaction plate 10 via the roller conveyor. It has a structure of being supported, and is a mechanism for applying a force of sandwiching and pushing from the back of the processing die 2 by pressing and holding the material 1. The driving force in this case is given to the material 1 by the energy of the motor 13 rotatingly driving the pair of connecting shoes 7a and 7b via the speed reducer 12 and the sprockets 8a and 8b. Therefore, the frictional force generated between the material 1 and the pair of connecting shoes 7a, 7b gives a pushing force to the material 1 behind the processing die 2. If a mechanism for controlling the pressure by the hydraulic cylinder 9 or the like is provided, it is possible to give a necessary and sufficient frictional force for pushing between the material 1 and the connecting shoes 7a, 7b.

The pushing mechanism 6 can apply a constant pushing force to the material by measuring the current of the drive motor 13 itself or controlling the movement of the motor while measuring the torque required for processing. The reason why the pushing force is 0.2 times or more the yield load of the material before working is that if it is less than that, it is not possible to perform a large surface reduction work or to enhance the mold filling property of the profile die. 1.0 of load
The reason for setting the length less than or equal to twice is to avoid problems such as material buckling behind the die that occurs when the size is larger than this. If the pulling-out mechanism 14 operates at a required speed, of the work required for material processing as described above, when the pushing side always shares a constant work, the remaining almost constant work is shared. As a result, stable operation becomes possible.

On the other hand, if a mechanism for controlling the pulling force to be constant is provided on the contrary, the remaining work will be shared by the pushing side, and almost the same stable operation is possible. To control the drawing side, for example, the drawing reciprocating body 1 of the drawing mechanism 14
When the driving force of 5 is applied by hydraulic pressure, the hydraulic pressure may be controlled. If a method of replacing the rotational force with the horizontal force is adopted,
Various measures may be selected and used, such as controlling the rotational force, or detecting the horizontal force with the load cell and feeding back the rotational force.

At this time, the pulling force is set to 0.2 times or more of the material yield load after processing, because if it is less than that, a large surface reduction cannot be performed in combination with indentation, and 1.0 or less. The reason for this is that if it exceeds this, the risk of wire breakage during processing increases, and it is difficult to obtain the required shape and size due to the phenomenon of thinning. In addition, the pulling-out reciprocating body 15 has a material penetrating throat 16 centered on an axis and has a chuck for sufficiently sandwiching the processing material 1 on the inner surface of the penetrating throat,
An arbitrary chuck shape other than a circular arc, a trapezoid or the like can be selected according to the shape of the V-shaped groove or the material that easily follows the dimensional fluctuation of the processing material.

As described above, by adopting a mechanism in which the pulling force is repeatedly applied to the material on the pulling side, the leading length of the material can be much shorter than that when the material is drawn by the endless track, and the working material Since only a part is sandwiched, compared to an endless track that sandwiches the whole part, it is less affected by the wire diameter variation of the metal rod, and stable pulling force can be applied.
With such a device, it is possible to greatly reduce the surface area by combining the pushing force and the pulling force, so the processed metal bar is almost straight, but when higher precision linearity is required. Is extremely efficient if it is cut through a straightening machine and equipped with a flying shear, etc. to a certain limited length, and during large surface reduction processing, heat is generated due to deformation of the material and friction between the material and the die. The heat generated by the heat cannot be ignored. In such a case, the durability of the die can be significantly improved by providing a water cooling pipe in the die or by cooling the entire die. INDUSTRIAL APPLICABILITY The present invention is an effective means when not only the material can be easily subjected to a large cross-section reduction process but also a complicated cross-sectional shape is required.

[0016]

EXAMPLE A coil of solid S48C rolled wire having a circular cross section with a diameter of 9.8 mm was used as the material, and a phosphate coating was overlaid with metal soap for lubrication. The length of the material grasping part of the connecting shoe of the pushing mechanism was 1012 mm, and the material was sandwiched by the hydraulic cylinder with a load of 10.2 tonf. Therefore, first, when controlling the pushing force, the torque of the sprocket is controlled so that a constant pushing force of 3.0 tonf is applied to the material behind the die. On the other hand, when controlling the withdrawal force, the hydraulic pressure for applying the withdrawal driving force is controlled to 1.1 tonf.
A constant pulling force of.

The peripheral speed of the connecting shoe of the pushing mechanism is 10 m.
/ min. The die is made of carbide and the material is processed to 5.7 mm. As a result, the surface reduction rate of the material is 66.2 under both conditions.
Processing of up to 100% could be performed without problems. On the other hand, in the conventional drawing process, the same processing could not be performed unless it was repeated three times, and a cap rack was generated in the third drawing process to make a product. Moreover, compared with the conventional case where an endless track is used on the drawing side, the equipment cost can be introduced at about two-thirds, and the time required for a new machining setup is one-third that of the conventional one.

[0018]

According to the present invention, the material grasping portion is short and the time for exchanging the material is greatly shortened, and the material through throat is provided, as compared with the conventional winding device in front of the die or the drawing method by the endless track. As a result, continuous machining is possible because it can be repeatedly grasped. While overcoming the drawbacks of continuous processing of straight rod-shaped steel wire, it is possible to continuously perform high surface reduction processing of metal rods, especially difficult-to-machine materials and irregular cross-section materials. , The processing material is not limited to solid material, not to mention hollow material, non-metallic substance inside the pipe, or
It is obvious that even those filled with different metals are applicable and have great industrial value.

[Brief description of drawings]

FIG. 1 is a schematic view of an example of one embodiment showing a configuration of the present invention.

[Explanation of symbols]

 1 Material Metal Rod 2 Machining Die 3 Die Axis 4 Die Block 5 Dice Guide 6 Clamping Mechanism 7a, 7b Connecting Shoes 8a, 8b Sprocket 9 Hydraulic Cylinder 10 Reaction Plate 11 Power Transmission Gear 12 Reducer 13 Drive Motor 14 Extraction Mechanism 15 Pullout reciprocating body 16 Material penetrating throat 17 Extraction guide table

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihisa Obata 12 Nakamachi, Muroran City Shin-Nippon Steel Co., Ltd. Muroran Steel Works (72) Inventor Teruo Kawabata 12 Nakamachi, Muroran City Muroran Shin Nippon Steel Co., Ltd. Inside the steelworks

Claims (2)

[Claims] 1. A mechanism for pressing and holding a raw material by a pair of connecting shoes, which is provided behind the central axis of the die hole type and provided with a portion that partially moves in parallel with the axis, and rotationally driven, and sandwiches and pushes the material into the die. , Forming a die adjacent to the end of the parallel part of the shoe, sandwiching the material passing through it and moving it for a certain distance, then releasing the material and returning to the original position, and repeating the same thing again A mechanism that has a pulling-out mechanism and controls the pushing force to a predetermined value of 0.2 to 1.0 times the yield load of the raw material before the raw material is processed when the pushing and pulling are applied to the raw material at the same time. , Or
0.2 to 1.0 times the yield load of the material after processing
A processing device for pushing and pulling a metal rod, which is provided with a mechanism for controlling to a predetermined constant value of double. 2. A material penetrating throat when the drawing mechanism is repeatedly moved is provided at the center of the material sandwiching portion which is the main part of the drawing mechanism, and the processing material is sufficiently sandwiched on the inner peripheral surface of the penetrating throat. The processing apparatus for imparting indentation and withdrawal to a metal rod according to claim 1, further comprising a chuck.