JPH01224110A - Method for lubrication in wire drawing - Google Patents

Abstract

PURPOSE:To stabilize a lubricant layer and to obtain high draft by applying and press-adhering a lubricant for hot or warm wire drawing to the surface of a steel wire stock in cold drawing stage, heating the wire up to a limited temp., and continuously perform hot or warm wire drawing. CONSTITUTION:Powdered lubricant 4 is filled into a container 3 joined to the inlet side of a wire drawing die 5. The lubricant 4 is applied to the surface of a steel wire stock 2 as the stock 2 passes through the inside of the container 3 and is strongly press adhered to the wire surface as the lubricant 4 is pulled toward the die 5 and passes through the die 5. The wire stock 2 whose surface is uniformly and strongly covered by a lubricant 4a for hot or warm wire drawing is heated at a temp. of 300-1,200 deg.C by a flying heat treatment furnace and is drawn by a wire drawing die 5. Therefore, hot or warm wire drawing is stably performed because the lubricant layer is stable.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wire drawing lubrication method for hot or warm wire drawing that has a large lubricant adhesion effect and provides a high processing rate. .

[Conventional technology] Conventional wire drawing! The lft1 slipping method can be roughly divided into two types: one in which lubricant is applied before heating the wire, and the other in which lubricant is applied after heating the wire. The former method involves applying a liquid lubricant or a lubricant mixed with a liquid and then heating and baking it, which makes it difficult to apply the lubricant evenly and the adhesion of the lubricant to the wire surface is poor. Because it is not large,
If the wire comes into contact with the furnace wall when inserted into the heating furnace prior to hot or warm wire drawing, the lubricant is likely to peel off.

In the latter method, since the heating temperature of the wire is high, the liquid lubricant or the lubricant mixed in the liquid scatters with a violent evaporation phenomenon and is not uniformly adhered. In addition, oils and fats such as powdered soap, which are lubricants, do not spread evenly over the wire surface.
It is dotted and burned.

[Problems to be Solved by the Invention] The purpose of the present invention is to overcome the conventional drawbacks, to provide stretch lubrication that allows lubricant to uniformly adhere to the surface of the wire and to enable stable and continuous hot or warm wire drawing. The object of the present invention is to provide an improved method of phosphoforming treatment.

[Means for Solving the Problems] In order to achieve the above object, the structure of the present invention is to apply a lubricant for hot or warm expansion and contraction to a cold wire before hot or warm wire drawing of a steel wire rod. In the wire drawing process, a lubricant for cold wire drawing is applied and pressure bonded to the surface of the VA wire rod, and then heated to a temperature of 300~
The A4 wire is heated to 1200°C and continuously drawn.

The present invention is applied to hot or warm wire drawing of high carbon steel wire, alloy steel wire, etc. An intermediate cold wire drawing is performed before hot or warm wire drawing, and at the same time, a lubricant for hot or warm wire drawing is added to the lubricant for cold wire drawing. is firmly crimped onto the surface of the steel wire. Specifically, a container filled with lubricant powder is connected to the inlet side of a die for cold wire drawing, and when the steel wire passes through the container, the lubricant is applied and the steel wire is drawn into the die. Crimp the surface of the wire.

The lubricant filled in the container (dice box) on the inlet side of the expandable die is graphite, boron nitride, or a mixture of these and cold wire drawing lubricants such as sodium stearate and calcium stearate.

All of the above-mentioned lubricants are powders, and as shown in FIG. 1, they are filled into a container 3 connected to the inlet side of a wire drawing die 5. When the steel wire rod passes through the inside of the container 3, the lubricant 4 easily adheres to the surface of the steel wire rod 2, and it is dragged toward the wire drawing die 5, and when it passes through the wire drawing die 5, the steel wire rod 20
Strongly pressed to the surface.

In this way, the W4 wire 2, on which the hot or warm wire drawing lubricant 4a is uniformly pressed, is heated to 300 to 1200°C in a traveling heat treatment furnace. The steel wire rod 2 that has come out of the heat treatment furnace is drawn 117X1 using a wire drawing die or the like.

Since the lubricant is firmly crimped onto the steel wire, it is possible to draw the wire at a processing rate of 25 to 35%, although this varies depending on the material and wire drawing die.

The present invention is also applicable to wires with irregular cross sections other than round wires.

Specific example: A 5UP12 wire rod with a wire diameter of 5 mm is subjected to normal continuous wire drawing to a wire diameter of 41 mm, and then graphite powder, which is a lubricant for hot offshore wires, and WJ lubrication for cold wire drawings are applied. A lubricant prepared by mixing a 7:30 ratio of calcium stearate powder with a lubricant was pressed onto the surface of the steel wire, and intermediate wire drawing was performed from a wire diameter of 4 m to a wire diameter of 3 am. This steel wire rod 2,
After heating to 400℃ in a traveling heat treatment furnace, the inner diameter of
．． Warm wire drawing was performed over 5000 m using a 6-■ die. It was confirmed that the surface of the steel wire rod was smooth over its entire length, and that the lubricant was evenly applied.

[Effects of the Invention] As described above, the present invention, before hot or warm wire drawing of a steel wire rod, applies a lubricant for hot or warm wire drawing to the surface of the lla material in the cold wire drawing process. The lubricant is applied and pressed onto the surface of the steel wire, heated to 300 to 1200℃ in a traveling heat treatment furnace, and then drawn continuously.The lubricant is strongly pressed onto the surface of the steel wire during the cold wire drawing process, so it is not heated. In the heat treatment process before the hot or warm wire drawing process, the lubricant film is very stable, and hot or warm wire drawing can be performed continuously and stably, resulting in a high workability.

Furthermore, graphite coating improves corrosion resistance.

Surface lubricity is improved, and coiling properties for springs and the like are also improved.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of an apparatus for achieving the telescopic lubrication method according to the invention. 2: 11 wire rod 3: Lubricant container 4: Lubricant 5: Wire drawing die Patent applicant Suzuki Metal Industry Co., Ltd.

Claims (3)

[Claims] (1) Before hot or warm wire drawing of a steel wire rod, apply a lubricant for hot or warm wire drawing to the surface of the steel wire rod in the cold wire drawing process. A wire drawing lubrication method characterized by crimping, heating at 300 to 1200° C. in a traveling heat treatment furnace, and continuously drawing the steel wire. (2) The wire drawing lubrication method according to claim (1), wherein the hot or warm lubricant is boron nitride, graphite, or a mixed powder thereof. (3) Connect a container filled with lubricant powder for hot or warm wire drawing to the inlet side of the die for cold wire drawing, and connect the inside of the container and the die for cold wire drawing continuously. The wire drawing lubrication method according to claim (1), wherein the lubricant powder is passed through and pressed onto the surface of the steel wire.