JP2532318B2 - Ultra high pressure lubrication wire drawing method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire drawing method and apparatus for drawing ultra-high pressure lubricating liquid under pressure between dies of a plurality of dies type to draw a wire.

[0002]

2. Description of the Related Art Recently, in order to improve the productivity of wire drawing, various wire drawing techniques have been developed by drawing wire using hydraulic pressure. One of them is a forced lubrication drawing device using multiple dies.

In a conventional plural die drawing apparatus, a plurality of, for example, two dies are provided in a die holder at predetermined intervals along the drawing direction of a wire rod, and an intermediate chamber formed between these two dies is provided. High pressure, eg 700kg / c
This is a technique in which a lubricating liquid of m ² or more is supplied under pressure, and the wire rod is drawn out while it is contained in the intermediate chamber.

Further, in the recent wire rod drawing technology, it is intended to improve the drawing efficiency by reducing the drawing force of the wire and die wear by further increasing the pressure of the lubricating liquid. There is.

[0005]

By the way, in the above prior art, by further increasing the pressure of the lubricating liquid,
It is possible to reduce the drawing force of the wire rod and reduce die wear, but on the other hand, the temperature of the lubricating liquid becomes too high in the intermediate chamber of the die holder, and even if the pressure of the lubricating liquid is increased, no increase in viscosity is observed and the liquid quality There is a drawback that it becomes unsuitable for drawing and impairs the lubricating effect of the lubricating liquid.

Further, in the forced lubrication drawing apparatus, scales such as oxide flakes adhering to the surface of the wire rod, metal powder, fine scale, impurities, etc. contained in the lubricating liquid enter the intermediate chamber of the die holder. When accumulated and introduced into the high pressure wire drawing die in the latter stage of the intermediate chamber together with the wire, there are drawbacks such as damage to the die or the wire, and further thinning or disconnection.

Especially when the lubricating liquid is made to have an extremely high pressure, even if a small amount of fine particles remain in the intermediate chamber, the fine particles are easily introduced into the high-pressure wire drawing die in the latter stage of the intermediate chamber and have a great influence on the surface quality of the wire. It causes defects and disconnections.

As a device for solving these drawbacks, for example, Japanese Utility Model Laid-Open No. 55-17653 discloses a device for withdrawing the lubricating liquid from the outflow port without retaining the lubricating liquid in the intermediate chamber. . However, although this technique can circulate the lubricating liquid to suppress the temperature rise of the lubricating liquid in the intermediate chamber, it is not a device having a structure capable of completely removing impurities and the like accumulated in the corners of the intermediate chamber.

The present invention has been made to solve the above-mentioned drawbacks in ultra-high pressure lubrication. By giving a flow velocity to the lubricating liquid that is pressurized and supplied into the intermediate chamber, the lubricating performance of the lubricating liquid is reduced and impurities are contained. Provided is an ultrahigh pressure lubrication wire drawing method and apparatus which prevent accumulation of the like.

[0010]

According to the method of the present invention, a plurality of dies are provided in a die holder at predetermined intervals in the wire drawing direction, and a lubricating liquid is pressurized and supplied into an intermediate chamber formed between the dies. In the ultra-high pressure lubrication wire drawing method for drawing a wire rod, the lubricating liquid is pressurized and supplied from a press-fitting hole provided on the downstream side in the drawing direction of the wire rod in the intermediate chamber, and the wire rod of the lubricating liquid is drawn in the intermediate chamber. Is maintained at a flow rate so that the relative speed to the wire rod is faster than the drawing speed of the wire, and the lubricating liquid that has flowed out is cleaned by a fine particle removing device and then added again. In the ultrahigh-pressure lubrication wire drawing method, the wire material is drawn while being pressed and circulated and supplied to the intermediate chamber.

Further, in the apparatus of the present invention, a plurality of dies are provided in the die holder at predetermined intervals in the drawing direction of the wire rod, and the lubricating liquid is pressurized and supplied into the intermediate chamber formed between these dies to pull out the wire rod. In an ultra-high pressure lubrication wire drawing apparatus that performs processing, a lubricating fluid press-fitting hole is provided on the downstream side in the drawing direction of the wire rod in the intermediate chamber, and an outflow hole is provided on the upstream side in the drawing direction,
A lubricating liquid pressurizing device is connected to the press-fitting hole via a circulation pipe, and an outflow hole is connected to the lubricating liquid pressing device via a fine particle removing device and an adjusting tank attached to the circulating pipe. It is an ultra-high pressure lubrication wire drawing device.

[0012]

According to the present invention, the lubricating liquid pressurized and supplied into the intermediate chamber of the die holder is caused to flow in the intermediate chamber while maintaining a predetermined flow velocity, and this is circulated to prevent the temperature of the lubricating liquid from rising. This is to prevent deterioration of the lubricating performance of the lubricating liquid, and to discharge damage such as dies and wire rods by discharging the scale and impurities in the intermediate chamber to the outside without depositing them.

In order to prevent fine particles from accumulating in the intermediate chamber, the lubricating liquid is forced to flow in the intermediate chamber within the range that does not adversely affect the high pressure lubrication wire drawing of the lubricating liquid, and the fine particles are discharged to the outside of the intermediate chamber. do it. In that case, the relative velocity of the intermediate chamber lubricating liquid with respect to the wire rod may be higher than the drawing speed of the wire rod, and the actual flow velocity is generally 0.1 m / s or more 50
This is achieved by supplying the lubricating liquid so that the m / s becomes less than or equal to m / s.

Here, with the lower limit of 0.1 m / s thick wire, the limit value at which solid fine particles are not deposited in the intermediate chamber in the case of high-pressure wire drawing with the slowest drawing speed is a value with some margin. The upper limit of 50 m / s is the maximum drawing speed of the thin wire, and is a limit that adversely affects the lubrication effect of high-pressure lubrication wire drawing. The volume will increase drastically and it will become necessary to increase the number of ultra high pressure pumps required.

The gap between the die holder, which is the inner cylinder of the intermediate chamber, and the wire drawing material is preferably about 1 to 5 mm, which is a gap that does not become clogged with oil slag, scale, or metal powder so that a critical flow velocity can be easily secured. Further, the distance between the press-fitting hole and the outflow hole is the distance required to stabilize the flow velocity of the lubricating liquid in the circumferential direction of the intermediate chamber, 30
It is preferably about 100 mm.

Due to the positional relationship between the press-fitting hole installed in the intermediate chamber and the outlet, a press-fitting hole for the lubricating liquid is provided on the downstream side in the drawing direction of the wire.
Further, the outflow holes are provided on the upstream side in order to make it difficult for oil slag, scales, metal powder, etc. to be drawn into the high pressure wire drawing die on the downstream side.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of an ultrahigh pressure lubrication wire drawing apparatus of the present invention.

In the drawing, 1 is a cylindrical die holder,
Reference numerals 2 and 3 denote two dies provided at a predetermined interval along the drawing direction of the wire rod 4 in the die holder 1, and the wire rod 4 is drawn from left to right in the drawing. Reference numeral 5 denotes an intermediate chamber which is formed between the dies 2 and 3 and into which a high-pressure lubricating liquid is supplied under pressure. A lubricating liquid press-fitting hole 6 is provided on the downstream side of the intermediate chamber 5 in the wire drawing direction, and an upstream side. The outflow hole 7 is provided in the.

The press-fitting hole 6 is connected to the lubricating-liquid pressurizing device 9 via a circulation pipe 10 for lubricating liquid, and the outflow hole 7 is connected to the intermediate chamber 5 via a circulation pipe 10 communicating with the press-fitting hole 6. Form a circulation circuit. Reference numeral 8 in the drawing denotes a lubricating liquid supply tank.

Further, in the middle of the circulation pipe 10, a throttle mechanism 12 for holding a high pressure, a fine particle removing device 11 used under atmospheric pressure, a lubricating liquid supply tank 8, an adjusting tank 13, and a lubricating liquid pressurizing device. 9 is provided. The lubricating liquid pressurizing device 9 employs a system in which hydraulic pressure, air pressure, and water pressure are used to quasi-statically pressurize water by Pascal's principle to generate high pressure.

The wire drawing device is constructed in this way, and the wire 4
Is introduced from the left to the right in the figure, and light drawing is performed with the die 2 and strong drawing is performed with the die 3. The lubricating liquid pressurized by the lubricating liquid pressurizing device 9 is supplied to the intermediate chamber 5 through the press-fitting hole 6.

The lubricating liquid supplied to the intermediate chamber 5 is controlled by the lubricating liquid pressurizing device 9 so that the relative flow velocity with respect to the wire 4 becomes equal to or higher than the drawing speed.
That is, it flows to the upstream side and flows out from the outflow hole 7.

In this intermediate chamber 5, fine particles such as oil slag, scale, and metal powder that have flowed into the intermediate chamber 5 together with the wire 4 flow upstream without being accumulated in the intermediate chamber 5 due to the flow of the lubricating liquid. And is discharged from the outflow hole 7 together with the lubricating liquid.

Therefore, fresh lubricating liquid is always filled near the inlet of the die 3 on the downstream side and introduced into the die 3, so that the die or the wire is damaged by impurities such as metal powder or fine scale, Further, no line thinning or disconnection occurs.

Next, the lubricating liquid that has flowed out of the outflow hole 7 has the amount of lubricating liquid consumed by the die 3 after being cleaned by removing fine slag, scale, metal powder, etc. in the fine particle removing device 11 under atmospheric pressure. Is supplied from the lubricating liquid supply tank 8 and is again pressurized to a predetermined pressure by the lubricating liquid pressurizing device 9, and is circulated and supplied from the circulation pipe 10 to the intermediate chamber 5 through the press-fitting hole 6.

As described above, the lubricating liquid is cooled and supplied by being circulated as appropriate without circulating in the intermediate chamber 5, so that the temperature in the intermediate chamber rises excessively even if the lubricating liquid is made to have an extremely high pressure. Therefore, the predetermined viscosity and the lubricating effect are maintained, and the effect of reducing the drawing force of the wire rod and the die wear in the ultra-high pressure lubrication wire drawing is exhibited.

In the above-described embodiment of the present invention, the case where the wire rod is pulled out by using the two dies 2 and 3 has been described.
The same applies to the case where the wire rod is pulled out using three or more dies.

[0028]

As described above, according to the present invention, when a wire rod is drawn out by a plurality of dice method, the pressure-supplied lubricating fluid is made to flow into the intermediate chamber formed between the dies while maintaining a predetermined flow velocity, and the lubricating fluid flows in with the wire rod. Fine particles such as slag, scale, and metal powder are discharged together with the lubricating liquid without accumulating in the intermediate chamber. Therefore, fresh lubricant is always introduced into the die on the downstream side, and the die or wire is not damaged by impurities, and the wire is not thinned or broken.

Further, since the lubricating liquid is cooled and supplied by being circulated as appropriate without staying in the intermediate chamber, the temperature is not excessively raised in the intermediate chamber even if the lubricating liquid is made to have an extremely high pressure. Therefore, the predetermined viscosity and the lubricating effect are maintained, and the effect of reducing the drawing force of the wire rod and the die wear in the ultra-high pressure lubrication wire drawing is exhibited.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of an ultrahigh pressure lubrication wire drawing apparatus of the present invention.

[Explanation of symbols]

 1 Die Holder 2, 3 Die 4 Wire Rod 5 Intermediate Chamber 6 Press-in Hole 7 Outflow Hole 8 Lubricant Supply Tank 9 Lubricant Pressurizer 10 Circulation Piping 11 Particle Removal Device 12 Throttling Mechanism 13 Adjustment Tank

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-52-754 (JP, A) JP-A-5-185135 (JP, A) JP-A-62-124021 (JP, A) Actual development Sho-58- 57313 (JP, U)

Claims (2)

(57) [Claims] 1. An ultra-high pressure for drawing a wire rod by providing a plurality of dies in a die holder at predetermined intervals in the drawing direction of the wire rod and supplying a lubricating liquid under pressure to an intermediate chamber formed between the dies. In the lubrication wire drawing method, the lubricating liquid is pressurized and supplied from a press-fitting hole provided on the downstream side in the drawing direction of the wire rod in the intermediate chamber, and the relative speed of the lubricating liquid to the wire rod is higher than the drawing speed of the wire rod in the intermediate chamber. While maintaining the flow velocity so as to increase the flow rate, it is made to flow out from the outflow hole provided on the upstream side in the drawing direction, and then the outflowing lubricating liquid is cleaned by the fine particle removing device and then pressurized again to circulate and supply to the intermediate chamber. An ultra-high pressure lubricated wire drawing method, characterized in that wire drawing is performed. 2. An ultrahigh pressure for drawing a wire rod by providing a plurality of dies in a die holder at predetermined intervals in the drawing direction of the wire rod and supplying a lubricating liquid under pressure to an intermediate chamber formed between the dies. In the lubrication wire drawing apparatus, a lubricating liquid press-fitting hole is provided on the downstream side in the drawing direction of the wire rod in the intermediate chamber, and an outlet hole is provided on the upstream side in the drawing direction, and the lubricating liquid pressurizing device is provided in the press-fitting hole via a circulation pipe. And the outflow hole is connected to the lubricating liquid pressurizing device through a fine particle removing device and an adjusting tank attached to the circulation pipe.