JPH0215819A - Wet forced lubricating wire drawing method for aluminum coated steel wire - Google Patents

Abstract

PURPOSE:To prevent die seizing and to prevent breaking of wire on the wire drawing by setting the relation between the lubricant viscosity and one side clearance between the wire rod and inlet tube to satisfy a specified conditions. CONSTITUTION:On the wet forced lubricating wire drawing apparatus for aluminum coated steel wire arranged with the inlet tube 2 just before a diameter reducing die 1, the relation between the viscosity mu(P) of the lubricant and the one side clearance (h) between the wire rod and inlet tube 2 is set to satisfy the inequality 2X10<3mu/h<23X10<5>. When the wet wire drawing of the aluminum coated steel wire is performed, the pressure generated in the diameter reducing die 1 is made suitable to maintain the lubricating effect of the lubricating oil 5 in the optimal conditions. By this method, the seizing of the die based on the faulty lubrication and the generating of the breaking of wire during the wire drawing are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wire drawing method with forced wet lubrication for aluminum-coated wires, and particularly to a wire drawing method that prevents defects such as wire breakage due to poor lubrication.

[Conventional technology and its problems]

Conventional aluminum-coated steel wire has a large difference in deformation resistance between the core material and the sheathing material, so it may not be possible to perform normal wire drawing processing.
Or even if it was possible, it would be extremely short. For this reason, application of the forced lubrication wire drawing method is being considered. There are basically two types of this method: the two-die method and the one-die method, and there are wet (oil) and dry (powder) methods depending on the type of lubricant used.The two-die method uses lubricant between two dies. This method increases the lubrication effect and draws the wire by supplying it at high pressure, but it has drawbacks such as the large and complicated equipment and poor workability. On the other hand, the l-die method is a method in which an inlet tube (lubricant introduction tube) is installed just before the diameter-reducing die, and the wire is drawn at high speed through the inside to generate high pressure and increase lubricity for wire drawing. It is widely used because it is easy to use and has good workability. Generally, in the above-mentioned wet l-die method, a lubricant such as Volipden (trade name, manufactured by Nippon Oil Co., Ltd.) or Mustardraw (trade name, manufactured by Showa Shell Co., Ltd.) is used as a lubricant. However, when drawing aluminum-coated steel wire using this lubricating oil, there is a risk of poor lubrication, resulting in die seizure, and accidents such as wire surface defects and wire breakage. There was a problem that coated steel wire could not be obtained.

[Problem that the invention seeks to solve]

As a result of studying the method of drawing aluminum-coated steel wire using the above lubricating oil, the present invention found that the viscosity of the lubricating oil and the clearance of the inlet tube are related to lubricity, and by adjusting this, We have developed a wire drawing method that does not cause die seizure.

[Means and effects for solving the problems] The present invention has the following features:
In a method of wet forced lubrication drawing of aluminum-coated steel wire using a die holder consisting of a diameter-reducing die and an inlet tube installed just before it, the viscosity of the lubricant μ(P
) and one side clearance h between wire rod and inlet tube
This is a wet forced lubrication wire drawing method for aluminum-coated steel wire, which is characterized in that the wire drawing is performed with the relationship (Ω) set to 2×105<μ/h work<3×105.

That is, in the one die method shown in FIG. 1, for example, the present invention provides an inleft tube (2
) and a guide die (3) are arranged in series and housed in a die holder (4). This die holder is immersed in lubricating oil (5), and the composite wire (6) passes through a guide die, an inleft tube, and is reduced in diameter by a diameter reduction die. At this time, since the wire passes through the inlet tube at high speed, the lubricating oil at the rear is drawn into the clearance (h) between the inner diameter of the inlet tube and the wire and lubricates the diameter reducing die. Note that the area around the dice is cooled with a coolant (7) such as water to prevent the area from becoming high temperature.

In the present invention, the relationship between the viscosity of the lubricating oil (μ: unit poise P) and the clearance between the wire rod and the inlet tube (h: unit cm) is expressed as 2×105<μ/hl<3X10S
It is used for wire drawing. Note that μ is a value at normal temperature and normal pressure, and h is a value of one-sided clearance. Under the above conditions, if /h2 is less than 2 x 103, the pressure generated within the diameter reducing die will be low and the lubricity will be reduced.
If the diameter exceeds ×105, the lubricating oil will be drawn into the inlet tube and diameter reducing die, making it difficult and reducing the lubricating effect.6For example, using the die holder for the one-die method shown in Fig. P25
) is used as a lubricant, the clearance h is 0.
Good wire drawing can be achieved by setting the wire to 09-1 and 12 mm.

In the present invention, in addition to the above-mentioned mustard draw and polybutene, the lubricating oil includes Super Draw (Farbest Kasei,
(product name), metal foam (Esso, product name), etc. can be applied. Moreover, it is applicable not only to the one-die method but also to a two-die method and a wire drawing method using this type of diameter-reducing die and a die holder having an inlet tube.

〔Example〕

An embodiment of the present invention will be described below.　　.

With the equipment shown in Figure 1, an outer diameter of 4.5 mm and a coverage rate of 62 mm were obtained.
% aluminum coated steel wire, inlet tube length 60■
, diameter reduction die hole diameter 4. Ommφ (tIi surface ratio approximately 20%)
Wire drawing experiments were conducted at a wire drawing speed of 130 m/win, using polybutene and mustard draw (viscosity 2 to 123 P) as lubricating oils, and varying the clearance between the wire rod and the inlet tube. The results are shown in FIG. In the figure, the O mark indicates that the wire could be drawn over a length of 5,000 meters or more, and the X mark indicates that the wire was broken after drawing for 200 to 300 m. As is clear from this figure, the range in which wire can be drawn is μ/h, where the viscosity of the lubricating oil is μ (P) and one side of the clearance between the wire rod and the inlet tube is h (cm).
It can be organized by l 2 XIO"<, /h"<3 XIO'
(7) It can be seen that wire drawing under these conditions is possible. In addition, when the wire was drawn under other conditions, die seizure occurred and wire breakage occurred.

〔effect〕

As explained above, according to the present invention, there is no occurrence of die seizure due to poor lubrication, and it is possible to draw high-quality long aluminum-coated steel wire without wire breakage, which has an industrially significant effect. There will be something to play.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between lubricating oil viscosity and clearance. DESCRIPTION OF SYMBOLS 1... Diameter reduction die, 2... Inlet tube, 3... Guide die, 4... Holder 5... Lubricant, 6... Composite wire, 7... Coolant.

Claims (1)

[Claims] In a method of wet forced lubrication drawing of aluminum-coated steel wire using a die holder consisting of a wire diameter die and an inlet tube installed just before it, the viscosity of the lubricant μ(P
) and the one-sided clearance h (cm) between the wire and the inlet tube as 2×10^3<μ/h^2<3×
A method for drawing an aluminum-coated steel wire with wet forced lubrication, characterized by drawing the wire as 10^5.