JP2801533B2 - Dieless wire drawing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal wire drawing apparatus, and more particularly to a difficult-to-work metal wire drawing apparatus.

[0002]

2. Description of the Related Art As one of the methods for drawing hard-to-work metal wires, for example, NT (nickel titanium) alloy wires, there is a dieless drawing method shown in FIG. 2 for drawing without using a die. The dieless wire drawing method shown in FIG. 2 uses a metal roller A, for example, an NT (nickel titanium) alloy bus, and feed rollers 2 of a wire feeder 1.
To the high-frequency heating furnace 3 at a constant supply speed Vi. The high-frequency heating furnace 3 heats the supplied metal bus A to several hundred degrees Celsius. The heated metal bus A is taken up by the take-up roller 5 of the take-up section 4 at a take-up speed Vo. At the time of this take-up, if the take-up speed Vo is set higher than the supply speed Vi, the outer diameter of the metal bus bar A becomes thin and the metal bus A is drawn.

[0005] The drawn metal wire B is cooled by a cooling unit 6, for example, a water-cooled pool, a shower or the like, measured for its outer diameter, and wound around a winding coil of a winding unit 7. When drawing this wire,
If the supply speed Vi is constant, the supply speed Vi and the take-up speed V
If the difference in o is increased, the diameter of the drawn metal wire B is large and the wire diameter is reduced. If the difference between the supply speed Vi and the take-off speed Vo is reduced, the diameter of the drawn metal wire B is reduced. Become.
Therefore, in a general dieless wire drawing, a method of controlling the outer diameter of the wire drawing by controlling the rotation speed of the take-up roller 5 of the take-up section 4 is a general wire drawing method.

[0004]

However, in order to keep the outer diameter of the wire drawn in the above-described general dieless drawing method constant, the following conditions are required. Keep the outer diameter of the supplied metal bus constant. Keep the feed rate of the metal bus constant. The heating temperature of the supplied metal bus is kept constant. Keep the take-off speed constant. By satisfying the above conditions, the drawn wire (metal wire) does not fluctuate in outer diameter and has a substantially constant outer diameter. However, if a disturbance occurs in the atmosphere of the wire drawing system during wire drawing under the above conditions, the outer diameter of the wire to be drawn may fluctuate. Once the outer diameter of the drawn wire fluctuates, the fluctuation becomes large and constriction or the like occurs in a part of the wire, sometimes leading to disconnection.

[0005] In order to suppress this fluctuation, the wire diameter during wire drawing is measured and the fluctuation of the wire drawing is monitored on-line. Methods for controlling fluctuations by controlling the combination of seeds with a computer have been developed. Although this on-line computer control method can sufficiently cope with the above-mentioned variation in outer diameter, there are problems that the wire drawing device becomes complicated and the device becomes expensive.

An object of the present invention is to solve the above-mentioned problems and to provide a die-less wire drawing apparatus capable of sufficiently suppressing variation in the outer diameter of a wire to be drawn by simple means. .

[0007]

The present invention has the following means to solve the above problems. The dieless wire drawing apparatus according to the first aspect of the present invention includes a means for supplying a drawing base material, a means for heating the supplied drawing base material, a means for drawing the heated drawing base material, Means for cooling the drawn wire, and means for drawing the cooled wire, wherein the means for drawing the heated drawn base material draws the cooled wire at a supply speed of the means for supplying the drawn wire. The take-up speed of the means is increased to reduce the diameter of the heated drawn base material and drawn, and at least the drawn wire is cooled from the outlet of the means for drawing the heated drawn base material. It is characterized in that it has a partition wall which is isolated from the outside up to the entrance of the means for performing the operation.

According to a second aspect of the present invention, there is provided a dieless wire drawing apparatus.
A heat insulating heater is provided on a partition wall isolated from the outside.

[0009]

According to the dieless wire drawing apparatus of the present invention, means for supplying a wire drawing base material, means for heating the supplied wire drawing base material, and wire drawing of the heated wire drawing base material. Means for cooling the drawn wire and means for drawing the cooled wire, wherein the means for drawing the heated wire is cooled by a supply speed of the means for supplying the wire. The drawing speed of the means for drawing the drawn wire is increased to reduce the diameter of the heated wire drawing base material, and the wire is drawn from at least the outlet of the means for drawing the heated wire drawing base material. Since there is a partition wall which is isolated from the outside up to the entrance of the means for cooling the drawn wire rod, it is not affected by disturbance during the drawing and the fluctuation of the outer diameter dimension can be made sufficiently smaller than before.

[0010] The dieless wire drawing apparatus according to claim 2 of the present invention comprises:
Since the heat retaining heater is provided on the partition wall that is isolated from the outside, the influence of the temperature change from the outside can be suppressed small, the shape of the meniscus portion C can be kept stable, and more stable drawing can be performed.

[0011]

The present invention will be described below in detail with reference to examples. Note that the same parts as those in the related art are denoted by the same reference numerals as those in the related art, and detailed description is omitted.

The dieless wire drawing apparatus of the present invention will be described with reference to FIG. In FIG. 1, A is a metal bus, for example, NT
This is a (nickel titanium) alloy bus. The NT alloy bus is supplied to the high-frequency heating furnace 3 by the supply roller 2 of the wire drawing supply unit 1 at a constant supply speed Vi. The supply roller 2 is driven by a supply roller drive motor 2A. The high-frequency heating furnace 3 heats the supplied metal bus A to several hundred degrees Celsius. 3A is a heating coil. 750-850 for NT alloy bus
Heat to about ° C.

The heated metal bus A is taken up by the take-up roller 5 of the take-up section 4 at a take-up speed Vo. At the time of this take-up, if the take-up speed Vo is set higher than the supply speed Vi, the outer diameter of the metal bus bar A becomes thin and the metal bus A is drawn. 5A is a drive motor for the take-up roller 5.

In the drawing state, in the case of the high-frequency heating furnace 3, the temperature of the metal bus A reaches the maximum temperature at the outlet side of the high-frequency heating furnace 3. At this time, the meniscus portion C from the original thick portion of the metal bus bar A to the thin drawn portion becomes almost half with the end on the outlet side of the high-frequency heating furnace 3 at the center. It straddles the inside and outside.

The metal bus A that is being drawn from the outlet side of the high-frequency heating furnace 3 passes through an outside air isolating cylinder 8 having a partition wall that is isolated from the outside, and is cooled by a cooling unit 6, for example, a water-cooled pool, a shower, or the like, and is wound up by a winding unit 7. Is wound up by the winding coil. The outside air isolating tube 8 is provided from the outlet 3B of the high-frequency heating furnace 3 to the inlet 6A of the cooling unit 6, so that the metal bus A in the middle of drawing is not in contact with the outside atmosphere. The outside air isolating tube 8 may be extended from the furnace tube 3C of the high-frequency heating furnace 3 and connected to the inlet 6A of the cooling unit 6, or may be formed using a tube different from the furnace tube 3C. Outlet 3B of high frequency heating furnace 3
Is provided from the outside to the inlet 6A of the cooling unit 6 so that the meniscus portion C of the metal bus bar A having the final drawn outside diameter is formed in an atmosphere isolated from the outside air. It can be drawn.

Further, an electric heater may be wound around the outer periphery of the outside air isolating cylinder 8 to heat it to keep the temperature. In this way, the influence of the temperature change from the outside can be suppressed to a small level, the stable shape of the meniscus portion C is maintained, and more stable drawing can be performed. Furthermore, an inert gas such as nitrogen gas, carbon dioxide gas, or argon may flow into the furnace core tube 3C of the high-frequency heating furnace 3 and the outside air isolation cylinder 8. By flowing an inert gas such as a nitrogen gas, a carbon dioxide gas, or an argon gas, the surface of the metal bus A (metal wire B) can be prevented from being oxidized.

[0017]

As described above, according to the dieless wire drawing apparatus of the first aspect of the present invention, means for supplying a wire drawing base material,
Means for heating the supplied wire drawing base material, means for drawing the heated wire drawing base material, means for cooling the drawn wire material, and means for drawing off the cooled wire material. The means for drawing the wire preform is increased in diameter by drawing the heated wire preform by increasing the take-up speed of the means for drawing the cooled wire from the supply speed of the means for supplying the wire preform. Since there is a partition that separates from the outside from at least the outlet of the means for drawing the heated drawn base material to the inlet of the means for cooling the drawn wire, at the same time, a disturbance occurs during the drawing. And the variation of the outer diameter can be made sufficiently smaller than before.

According to the dieless wire drawing apparatus of the second aspect of the present invention, since the heat insulating heater is provided on the partition wall which is isolated from the outside,
The influence of a temperature change from the outside can be suppressed to a small level, the shape of the stable meniscus portion is maintained, and more stable drawing can be performed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a dieless wire drawing apparatus of the present invention.

FIG. 2 is an explanatory diagram showing an example of a conventional dieless wire drawing method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wire drawing supply section 2 supply roller 3 high-frequency heating furnace 3B high-frequency heating furnace outlet 4 take-up section 5 take-up roller 5A take-up roller drive motor 6 cooling section 6A cooling section entrance 7 take-up section 8 outside air isolation cylinder A metal bus B wire drawing Metal wire C meniscus part

Claims (2)

(57) [Claims] 1. A means for supplying a drawn wire base, a means for heating a supplied drawn wire, a means for drawing a heated drawn wire, a means for cooling a drawn wire, and cooling. Means for drawing the heated wire rod, wherein the means for drawing the heated wire drawing base material increases the drawing speed of the means for drawing the cooled wire rod from the supply speed of the means for supplying the wire drawing base material. At least from the outlet of the means for drawing the heated wire drawing base material to the inlet of the means for cooling the drawn wire material while reducing the diameter of the heated wire drawing base material and drawing. A dieless wire drawing apparatus having a partition for isolation. 2. The dieless wire drawing apparatus according to claim 1, wherein a heat retaining heater is provided on a partition wall isolated from the outside.