JPS61196136A - Forecast of deterioration in lubricant - Google Patents

Abstract

PURPOSE:To forecast deterioration in a lubricant, by pressing a rotor rotating with a electrically rotary drive source on a test piece for evaluation of the lubricant to make it rotate in the lubricant. CONSTITUTION:A rotor 8 is pressed on a test piece 1 for evaluation of a lubricant and a part thereof 8 is immersed into a lubricant 10 and under such a condition, the rotor 8 is rotated by a motor 9. When the lubricant 10 is mixed with a fine metal powder or the like, the friction resistance between the rotor 8 and the test piece 1 rises so sharply as to change the load current of the motor 9. Thus, deterioration in the lubricant 10 can be forecast positively depending on the changes in the load current value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for predicting deterioration of a lubricant used in wire drawing, cutting, or the like.

[Prior art] Lubricating fluids are widely used in various processes such as wire drawing and cutting, but especially when drawing steel cord, continuous wire drawing is performed at a fairly high speed of about 1000 m/min. It is.

Therefore, in such high-speed wire drawing, llI! Management of the r41I liquid, that is, early detection of deterioration of the r41I liquid, has become an extremely important issue. This is because if a lubricant that has deteriorated beyond its limit is used by mistake, problems such as a rapid shortening of the life of the die, a rapid decrease in the smoothness of the surface of the steel cord strand, and wire breakage during wire drawing will occur.

Therefore, as a conventional method to predict lubricant deterioration,
I) Management by H value or llI! The temperature of the lW4 liquid is controlled.

[Problems to be solved by the invention] However, the above l) H value or rlJ
WIw! Predicting temperature-induced deterioration has not been able to reliably prevent the rapid decrease in die life and the decrease in steel cord surface smoothness that tend to occur due to high-speed expansion and contraction.

In other words, even when the pH value or temperature does not change much, when such m synovial fluid is used, the life of the die suddenly decreases. This is because fine metal powder generated during the wire drawing process, or fine metal soap powder generated by the reaction between the main component of the lubricant and the metal, gradually mix into the rIJW4 liquid as the Shinichi process progresses, and as a result, these particles appear on the die surface. This is thought to be due to the fact that the fine powder eats away, destroying the boundary lubrication state between the die surface and the wire surface, resulting in a so-called seizure phenomenon.

Although it is conceivable that the above-mentioned fine particles can be removed by filtering the lubricating liquid using a filter or the like, it is actually extremely difficult to remove fine particles with a diameter of approximately μ-.

Therefore, an object of the present invention is to provide a lubricant deterioration prediction method that can accurately and reliably predict the deterioration of a machining lubricant.

[Means for Solving the Problems] This invention has been made as a result of intensive studies in view of the above problems, and its gist is that at least a portion of the invention is immersed in the lubricating liquid to be evaluated. A rotor rotated by an electric rotational drive source is rotated in a state in which it is in pressure contact with a test piece for evaluating IIWI liquid, and deterioration of the lubricating liquid is detected from changes in the rotation of the rotor. i1! This is a method for predicting deterioration of synovial fluid.

[Function] In this invention, a specific test piece for evaluating 1ffl FR liquid is used, a rotor that is at least partially immersed in the lubricating liquid to be evaluated is brought into pressure contact with the test piece, and the rotor is driven to rotate. , l! The influence of fine metal powder etc. mixed into the IWI liquid can be reliably detected by the test piece and rotor.

[Explanation of Examples] Examples of the present invention will be described below.

FIG. 1 is a diagram schematically showing an apparatus for carrying out an embodiment of the present invention. In FIG. 1, a lubricant evaluation test piece 1 is fixed to a first load transmission plate 2. As shown in FIG. 1st
A shaft 3 is inserted through the load transmission plate 2 , so that the first load transmission plate 2 can rotate around the shaft 3 . Further, a load transmission adjustment bolt 4 is fixedly attached near one end of the first load transmission plate 2. The other end of the load transmission adjustment bolt 4 is fixed to one end of the second load transmission plate 5. Further, the second load transfer plate 5 is configured such that the shaft 6 is rotatable around the shaft 6.
is inserted into. Further, a weight 7 for applying a load is suspended from the other end of the second load transmission plate 5.

Therefore, the load due to the weight 7 is transferred to the second load transmission plate 5.
, is transmitted to the lubricating fluid evaluation test piece 1 via the load transmission adjustment bolt 4 and the first load transmission plate 2, and a downward force is applied to the aIWI liquid evaluation test piece 1 in the drawing.

On the other hand, a rotor 8 is provided directly below the lubricant evaluation test piece 1. Therefore, the lubricant evaluation test piece 1 is subjected to a downward force due to the load from the weight 7 described above.
is pressed against the rotor 8.

The rotor 8 is connected to a motor 9 as an electric rotation drive source, and is configured to be rotationally driven by the similar motor 9. Moreover, the lower part of D-18 is immersed in the lubricating liquid 10 to be evaluated.

Therefore, the surface of the rotor 8 rotated by the motor 9 is coated with the lubricating liquid 10, and the lubricating liquid 10 causes
It is rotated while being in contact with the lubricant evaluation test piece 1 while being subjected to the following effects.

In the device shown in FIG. 1, a recorder 12 is connected to the motor 9 via an ammeter 11, and the recorder 12 is configured to record changes in the current value of the motor 9. has been done. Similarly, a thermocouple 13 is immersed in the lubricant 10, and the thermocouple 13 is also connected to the recorder 12 so that the recorder 12 records the temperature change of the lubricant 10. It is configured.

In one embodiment of the present invention, in the apparatus shown in FIG. 1, the test piece 1 and the rotor 8 are brought into pressure contact as shown in the figure, and at least a portion of the rotor 8 is soaked in the lubricant 10 to be evaluated for corrosion. The rotor 8 is rotated by a motor 9 in the immersed state. At this time, I! I If fine metal powder or the like is mixed in the synovial fluid 10, the frictional resistance between the rotor 8 and the lubricant evaluation test piece 1 will rapidly increase, and the load current of the motor 9 will therefore change rapidly. It turns out. Therefore, deterioration of the rAWI liquid 10 is predicted by this change in current value. Note that deterioration of the lubricant 10 can be similarly detected by measuring changes in the torque of the motor 9 instead of changes in the current value of the motor 9.

Furthermore, in this example, r! ! A thermocouple 13 is also used as a method for predicting deterioration of the JWI liquid 10. That is, by also detecting the temperature of the rIIfl liquid 10, the lubricating fluid deterioration detection accuracy can be further improved. Therefore, when both the change in the current value of the motor 9 and the temperature change of the lubricant 10 are significant, it is possible to judge that the deterioration of the lubricant 10 is also severe, and 'l11
21! If a change in value occurs but the temperature change is not significant, it can be determined that the lubricating fluid 1° has deteriorated, but the degree of deterioration is relatively small.

Next, specific experimental results of this invention will be explained.

When drawing a steel cord with a diameter of 0.3211, the lubricating liquid after drawing 0.3t, 6t, 18t and 9t, and the lubricating liquid after drawing 9 were filtered through filter paper. Post-rIJ synovial fluid was collected and evaluated in the apparatus shown in Figure 1, respectively.

As the rIJWI liquid, a commercially available one was used, and as the rotor 8, one made of a carbide ring was used, and the rotation speed was 360.
0 rpm, and 6-4 brass was used as the test piece for evaluation. In either case, the load amount is 250! ;
It was set as l.

As an objective reference value for the amount of wear on the evaluation test piece, the wear area on each test piece was measured, and the p
The i-1 value was also measured. The wear area and llH value are shown in FIG. As is clear from FIG. 2, as the elongation am increases, the wear area increases, and therefore the amount of floating metal powder increases. however,
It can be seen that the pH value increases only slowly, and therefore it is difficult to predict lubricant deterioration from the DH value.

On the other hand, the results obtained with the apparatus shown in FIG. 1, ie, changes in current value and changes in lubricating oil temperature, are shown in FIG. '3. In addition, in Fig. 3, (a) is the lubricant after expansion/contraction amount 3, (b) is the lubricant after expansion/contraction Ijlf118, <c> is the lubricant after expansion/contraction 51m9, and (
d) is r after expansion/contraction JlQt! The results are shown for the bale lubricating fluid obtained by filtering J synovial fluid through filter paper.

As is clear from Fig. 3, the change in current value corresponds well to the change in the wear area shown in Fig. 2, and the results for the lubricating fluid of 9. (
In FIG. 3(C)), it can be seen that the current value changes significantly and that a temperature increase, which is considered to be caused by heat generation, is also observed.

On the other hand, as is clear from FIG. 3(a), it is recognized that the current value and temperature are both stable in the lubricating fluid after drawing wire No. 3, which has a relatively small amount of wear.

Furthermore, rR after drawing 9? As is clear from FIG. 3(d), the lubricating fluid after the lf fluid has been filtered shows that the current value and temperature do not change much and are relatively stable. This result is also supported by the amount of wear area shown in FIG.

In addition, FIGS. 4(a) and 4(b) show metal llAm'4rM microscopic photographs of the surface of each test piece when an evaluation test was carried out using the rlJWI liquid containing 1m110.9.

From the above specific experimental results, it can be seen that the deterioration of the lubricating fluid can be detected accurately and reliably by changing the m flow value of the motor 9 in the apparatus shown in FIG.

In addition, in the embodiment described above, the motor 9 is used as the rotational drive source.
However, as long as it is a rotational drive source capable of rotating the rotor 8, any rotational drive source other than the motor can be used.

Further, as the material constituting the rotor 8, various hard materials such as cemented carbide, ceramics, high speed steel, or carbon tool steel can be used. Similarly, for the evaluation test piece 1, a workpiece material for which the mFR liquid is used, such as a metal material or ceramics, can be used.

[Effects of the Invention] As described above, according to the present invention, at least a portion of the I! l? l! The rotor, which is immersed in the liquid and rotated by an electric rotational drive source, is rotated while being in pressure contact with the AM liquid evaluation test piece, and the deterioration of the lubricating liquid is determined by the rotational change of the rotor. Therefore, it is possible to reliably and accurately detect the deterioration of liquor containing metal powder, which is difficult to remove with filters, using an extremely simple method and inexpensive equipment. Become. Furthermore, since this method is relatively simple to implement, it can be applied directly to the wire drawing line, for example, and therefore it is also possible to carry out automatic measurements in the wire drawing line.

This invention is applicable not only to the wire drawing of steel cords, but also to the general prediction of deterioration of synovial fluid used in the wire drawing work of various metal materials such as Cu or Qu gold alloys, Ai or Al1 alloys. Let me point this out. Also,
This can be used to predict the deterioration of Ifl liquid for processing that has been filtered through a filter or the like.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an apparatus for carrying out an embodiment of the present invention. Figure 2 shows the wear area of the evaluation test piece and the IIIWJ liquid pHi! ! It is a figure which shows the relationship between and the amount of wire drawing. FIG. 3 is a diagram showing specific experimental results in one embodiment of the present invention, and shows the IIM! Ti
FIG. 3 is a diagram showing changes in temperature and current value of l*. Figure 4<
a > and (b) are extended I! It is an electron micrograph which shows the metal structure of the surface of each test piece for evaluation when the lubricating liquid in the case of the amount O and the lubricating liquid in the case of the wire drawing amount 9 were used. In the figure, 1 is a test piece for RA synovial fluid evaluation, 8 is a rotor,
Reference numeral 9 indicates a motor as an electric rotational drive source, and 10 indicates a lubricant. Figure 1 1: Test piece for lubricating fluid evaluation 8: Rotor 9: Motor 10: Leaping palm assembly

Claims (6)

[Claims] (1) A rotor, which is at least partially immersed in the lubricating liquid to be evaluated and is rotated by an electric rotational drive source, is rotated while being in pressure contact with the lubricating liquid evaluation test piece. A lubricant deterioration prediction method characterized by detecting lubricant deterioration based on changes in rotor rotation. (2) The lubricating fluid deterioration prediction method according to claim 1, wherein a change in rotation of the rotor is detected by a change in a load current value of the electric rotational drive source. (3) The lubricating fluid deterioration prediction method according to claim 1, wherein a change in rotation of the rotor is detected by a change in torque of the electric rotational drive source. (4) Measure the temperature change of the lubricating fluid, and use the temperature information in conjunction with prediction of deterioration of the lubricating fluid.
The method for predicting lubricating fluid deterioration according to any one of items 1 to 3. (5) The lubrication according to any one of claims 1 to 4, wherein a hard material is used as the rotor, and a workpiece on which a lubricant is used is used as the test piece for evaluating the lubricant. Method for predicting liquid deterioration. (6) As the hard material, cemented carbide, ceramics,
The lubricating fluid deterioration prediction method according to claim 5, which uses a material selected from the group consisting of high speed steel and carbon tool steel.