JPS60206518A - Method of controlling cold rolling oil - Google Patents

Abstract

PURPOSE:To improve cleanness of cold rolling oil and efficiency of rolling by detecting concentration of mixed solution in a mixing tank and concentration of reclaimed oil in a clean tank and controlling concentration of mixed solution and reclaimed oil automatically. CONSTITUTION:The waste oil used for rolling work of a rolling mill 1 is recovered and collected in a dirty tank 2. After filtering the oil by a magnet filter 21 and a Hoffman filters, the oil is led to a clean tank 4. The crude oil and pure water to be replenished to the tank 4 are mixed in a mixing tank 5, and the mixed solution of specified high concentration for replenishment is prepared beforehand. Supply tubes 51, 6 that lead the mixed solution and warmed pure water to the tank 4 are provided separately. The concentration of reclaimed oil in the tank 4 and the concentration of mixed solution in the tank 5 are detected, and the concentration of reclaimed oil in the tank 4 is controlled automatically to specified set value.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for managing cold rolling oil when the cold rolling oil in copper strip rolling is recycled and recycled.

(b) Prior Art In the cold rolling of copper strips, a large amount of rolling oil is used for the purpose of lubrication and cooling. Therefore, the used oil is usually collected and cleaned, and then reused. In other words, the recovered oil is first
Collect it in a tank and remove iron with a magnetic filter.
This is passed through a Hoffman filter and collected in a clean tank, which is then appropriately replenished with undiluted solution and pure water to obtain recycled oil.

In the conventional method, since the cleaning process using a Hoffman filter is not performed on the entire amount, impurities such as iron scum remain in the recycled oil, resulting in decreased rolling properties and contamination of the product. was causing the occurrence of In addition, oil stored in clean tanks must be kept at a predetermined concentration and a constant supply amount, so it is always necessary to replenish new oil, but in the past, crude oil and pure water were separated. However, as the rolling stock was not always properly managed, there was a problem in that the concentration and temperature varied, resulting in a decrease in rollability and unit consumption.

(/U) Purpose of the Invention The purpose of the present invention is to provide a rolling oil management method that eliminates the various drawbacks of such conventional management methods, has high cleanliness, and can improve rolling efficiency. be.

2) Structure of the Invention In the present invention, as shown in FIG. The basic configuration is a conventional circulation system in which the cleaned and stored fluid is stored in the clean tank 4 and then circulated back to the rolling mill 1 via the circulation supply pipe 44. It is characterized by the addition of some improvements and the provision of automatic control means for crude oil replenishment.

In the tank configuration, the skimming tank 3, the dirty tank 2, and the clean tank 4 are placed adjacent to each other, and the dirty tank 2 has a primary side tank 2α, which has a higher degree of contamination, and a secondary side tank, which has a lower degree of contamination. It is formed separately from 2b. The waste oil collected by the collection pit 11 is collected in the dirty tank 2, but all the collected oil collected in the secondary tank 2h is passed through a magnetic filter 21 to remove impurities and iron content from the oil. Dirty tank 2 is also equipped with a gap 22, which captures the upper layer of oil in which impurities tend to float, transfers it to skimming tank 3, and separates it from sludge so that it can be treated as waste oil.Dirty tank 2 The recovered oil stored on the secondary side 2h of
It is designed so that it can be transferred to the clean tank 4 via the circulation pipe 23. All recovered oil sent via this pipe 23 passes through a Hoffman filter 41, so that only completely filtered oil is stored in the clean tank 4. In addition, dirty
The tank is provided with a communication pipe 25 for communicating the primary side 2α and the secondary side 2h as necessary.

In addition to the above-mentioned circulation pipe 23, the clean tank 4 includes a pipe 51 that supplies the mixed liquid from the mixing tank 5.
Two replenishment pipes are provided: a pipe 6 and a pipe 6 for supplying pure water. The mixing tank 5 is one of the important parts constituting the method of the present invention, and the crude oil for replenishment and pure water are sent into the same tank and mixed in advance, and the concentration of the mixed liquid in the tank is kept relatively high. The concentration (for example, 20% concentration) is maintained. On the other hand, the temperature of the mixed liquid in the mixing tank 5 can also be controlled at the same time.

Therefore, in the present invention, a concentration meter 42 is installed in the clean tank 4, a concentration meter 52 is also installed in the mixing tank 5 to continuously measure each concentration, and a level meter is installed in the dirty tank 2. 24 is provided to detect the upper and lower limits of recovered oil, and input these to the control device 7 to control the oil in the clean tank 4 so that it can be maintained at a relatively low concentration (for example, 3-chi concentration). The device 7 is set to command the solenoid valve 51'' of the mixed liquid supply pipe 51 to open and close, or the solenoid valve 61 of the pure water supply pipe 6 to open and close. In step 4, the level is maintained so that the recycled oil always overflows to the dirty tank side.

Furthermore, in the present invention, the pure water supplied to the mixing tank 5 and the pure water directly supplied to the clean tank 4 are heated to a predetermined temperature by a heat exchanger 62. Thermometers 43 and 53 are provided in each of the clean tank 4 and the mixing tank 5, and the temperature of the recycled oil in the clean tank 4 can be controlled by inputting the detected values to the control device 7.

(E) Example In carrying out the method of the present invention, the mixing tank 5
The concentration of the mixed liquid was set to 20%, and based on the detected values from the level meter 24 and the automatic concentration meter 42, automatic replenishment was performed by a command from the control device 70 to maintain the clean tank concentration at Section 3. However, the concentration variation during replenishment is ±01% compared to the conventional ±05%, and the variation in temperature change is 1° compared to the conventional 5 to 10°C.
It was within C.

(c) Effects According to the method of the present invention, the cleanliness of recovered oil is extremely high.
Since the concentration and temperature are automatically controlled to an appropriate level, it can fully function as a rolling oil, and there is no risk of deteriorating the quality of the rolled product (i.e., preventing heat scratches from eaves). Comparing the occurrence status, it is 0.1 compared to the conventional
Reduced from 3% to 0.05%, resulting in 0.03% dirt on finished products
Roll flaws decreased from 0.4% to 0.01%.
It decreased to 3%. In addition, the basic unit of rolling oil is 0.5-&/
The production efficiency improved significantly from T to 0.413/T.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram schematically showing the overall configuration of the present invention. 1: Rolling mill 2: Dirty tank 3: Skimming tank 4: Clean tank 5: Mixing tank 6; Pure water supply pipeline 7-Control device Patent applicant: Sumitomo Metal Industries, Ltd.

Claims (1)

[Claims] Collect waste rolling oil from the rolling mill after it has been used in rolling operations,
In a rolling oil management method, the rolling oil is first collected in a dirty tank, filtered by a magnetic filter and a Hoffman filter, and then led to a clean tank, and the clean tank is replenished with crude oil and pure water to regenerate circulating rolling oil. A mixing tank is provided to mix the crude oil and pure water to be replenished, and a predetermined high concentration replenishment mixture is obtained in advance. A supply pipe system for converting hot water to a clean tank is provided separately, and the concentration of the recycled oil in the clean tank and the concentration of the mixed liquid in the mixing tank are continuously detected, and the mixed liquid and pure water are continuously detected. A method of managing cold rolling oil that includes automatically controlling the concentration of recycled oil in a clean tank to a predetermined set value by automatic replenishment of oil.