JPS60144392A - Lubricant for cold rolling of titanium sheet - Google Patents

Abstract

PURPOSE:To provide the titled lubricating oil having an excellent seizure preventing effect in the cold rolling of titanium sheet, consisting of a mineral lubricating oil, a beef tallow lubricating oil or palm oil and graphite powder having a specified particle size. CONSTITUTION:1-60wt% graphite powder composed of particles having a particle size of 100mum or below and contg. at least 50% particles having a particle size of 10mum or below, is added to a mineral lubricating oil, a beef tallow lubricating oil or palm oil to obtain a lubricating oil for the cold rolling of titanium sheet. The lubricating oil is applied to the titanium sheet in a coating weight of 0.2-1.0g/m<2>.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lubricant for cold rolling of pure titanium, titanium alloy, titanium clad steel, etc. (hereinafter simply referred to as "titanium plate etc.").

(Prior Art) Titanium is an active metal and tends to seize during processing. Seizure on the rolling rolls also occurs during cold rolling of titanium plates, etc., so the rolling reduction per arm is kept small and the rolling speed is low. For this reason, the reality is that rolling is carried out in a very inefficient manner.

As a method for preventing seizure during cold rolling of titanium plates, etc., (1) a method of using highly saponified oil with a saponification value of 170 or more as a rolling lubricant (Japanese Patent Application Laid-Open No. 54-145349)
(2) A method of applying an oxide film to the surface of a cold-rolled titanium blank and cold rolling it (Japanese Unexamined Patent Publication No. 54-88858)
Publication No.) etc.

Method (1) does not have a sufficient anti-seizure effect in areas where the rolling reduction is high, and method (2) does not have a sufficient anti-seizure effect in areas where the rolling reduction is high, and method (2) results in an uneven sheet surface after cold rolling due to the oxide film. Considering this, it is not satisfactory.

(Purpose of the invention) If seizure during cold rolling of titanium plates, etc. can be prevented or reduced, rolling can be performed at high speed and under high pressure compared to the current situation, and productivity can be improved and products with good surface quality can be obtained. can. Furthermore, roll grinding due to titanium seizure is reduced, leading to improved workability and cost reduction.

An object of the present invention is to provide a 4-gate lubricant for cold rolling that is highly effective in preventing seizure during cold rolling of titanium.

(Structure and function of yori-kiri) The present inventors investigated a lubricant for preventing seizure during cold rolling of titanium plates, and found that if rolling is performed with a lubricant in which graphite powder is dispersed, It was found that it is effective in preventing burn-in.

The lubricant of the present invention is composed of rolling lubricating oil, which is currently widely used for rolling steel, and graphite powder having a particle size of 100 μm or less. The rolling lubricant is mineral oil based.

These include tallow-based lubricating oils alone or to which synthetic esters, synthetic alcohols, various fatty acid compounds, etc. have been added, and gum oils.

The lubricant of the present invention is one in which the above lubricating oil contains 1 to 601% by weight of graphite powder with a particle size of 100 μm or less.

When the particle size of the graphite powder exceeds 100 μm, it is difficult to uniformly disperse it in oil, and the particles tend to settle, resulting in poor lubricant stability. The particle size distribution of the graphite powder is suitably such that the number of particles of 10t1m or less is 50cm or more.

If the content of graphite powder is less than 1 inch, the lubricant has a small anti-seizure effect, and if it exceeds 60%, the viscosity of the lubricant becomes high, resulting in poor workability. Practical blending range is 2-40%
is appropriate.

The amount of lubricant applied to the rolled plate according to the present invention is 0.2 to 1.
Managed by 0 and 2. If it is less than 0.2117 m2, the anti-seize effect will be insufficient, and if it exceeds 197 m2, it will be economically disadvantageous.

The lubricant of the present invention requires exactly the same equipment as conventional lubricants.

It can be used in any way.

(Example) Examples of the present invention will be described below. Table 1 shows the conditions of the example and the anti-seizure effect at that time.

The titanium plate used for cold rolling was a JIS2filt hot-rolled annealed pickled plate with a size of 2.5 t x 50 w x 2001 (ke). For rolling, a rolling mill with a roll diameter of 150 +++ m (7) was used, and the rolling reduction per arm was 20 inches and 3-J? The rolling process was carried out.

Two types of graphite powder with different particle size distributions were investigated, but as shown in Example 3, the dispersibility in oil was uneven in those containing particles of 100 μm or more. In terms of the amount, some burn-in to the roll was observed. On the other hand, in Examples 2, 4, and 5.6, in which 5 to 40% by weight of graphite powder with 60% of small particle diameters of 10 μm or less was blended, seizure occurred in both mineral oil-based and beef tallow-based lubricants. There wasn't. However, when the blending amount of graphite powder was 1% by weight, the anti-seizure effect was insufficient as shown in Example 1. In Example 7, seizure occurred on the roll over the entire width of the titanium plate in the lubricating oil that did not contain graphite powder.

(Effects of the Invention) When a titanium plate is cold-rolled using the lubricant of the present invention, seizure of titanium to the roll does not occur, so that high-speed, high-reduction rolling becomes possible and productivity improves. The reduction in roll grinding results in excellent effects such as cost reduction and stable surface quality.

Claims (2)

[Claims] (1) A lubricant for cold rolling titanium sheets containing 1 to 60% by weight of graphite powder with a particle size of 100 μm or less. (2) The remainder is mineral oil-based lubricating oil or tallow-based lubricating oil or No. 9-
The lubricant according to the claims, characterized in that the lubricant is a rubber oil.