JPS6024158B2 - Water-soluble lubricant for tapping process - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-soluble lubricant for tapping that has excellent tool life and finishing accuracy, and allows for continuous, concentrated lubrication.

As is well known, high viscosity water-insoluble lubricants based on tapping base or mineral oil are used in the tapping of nuts or mechanical parts by machines such as upright drilling machines, radial drilling machines, drill tapping machines and the like.

However, for example, mechanical parts are manufactured through multiple processes such as turning, IJ-machining, counterbore, drilling taps, boring, and broaching, but these processes are performed using machining centers, transfer machines, automatic lathes, and specialized Unmanned continuous machining using machines and composite machining using several types of cutting tools have become mainstream.

The lubricant used in this process is generally a water-soluble cutting oil or a relatively low-viscosity water-insoluble cutting oil, and the lubricant is continuously supplied from one tank to the cutting part in each process by a supply device. However, even in this case, tapping requires severe cutting conditions caused by the tap structure, such as cutting with sharp cutting edges,
This is done using a large frictional force acting on the threaded part, and high finishing accuracy is required. Therefore, the tapping base used in the industry or a high viscosity water-insoluble tapping lubricant is applied with a brush, brush, or by hand. The cutting part must be supplied with oil or by another automatic oil supply device. Furthermore, since machining centers, which have recently been widely adopted in machine shops, process various workpieces, even if automatic lubrication devices are installed, defects are often compensated for manually, resulting in a significant drop in work efficiency.

Moreover, the tapping base or the highly viscous water-insoluble tapping lubricant will be mixed into the cutting fluid used for purposes other than tapping, reducing the performance of the cutting fluid.
For example, during tapping, tapping base or non-water-soluble tapping lubricant adheres to the surface of the workpiece, but when the workpiece comes into contact with water-soluble cutting fluid in the subsequent process, tapping base or non-water-soluble tapping lubricant adheres to the surface of the workpiece. Contamination with water-soluble tapping lubricant not only leads to early rotting, but also causes deterioration of the working environment and a significant drop in work efficiency. Furthermore, tapping base or highly viscous water-insoluble tapping lubricant that adheres to the workpiece cannot be sufficiently cleaned during the cleaning process unless a cleaning agent heated to 70°C or higher is used. There were various problems such as not only requiring cleaning of the parts but also causing coating defects in the subsequent painting process.

In addition, in machine factories, from the viewpoint of fire prevention, energy saving, and improvement of the working environment, there is a demand for oils that are water-resistant and that are resistant to spoilage even when mixed with other oils. In view of the above circumstances, the present inventors focused on the possibility that the above problems could be eliminated by developing a lubricant for tapping that is water-repellent and can withstand the harsh cutting conditions of tapping, and as a result of intensive study. The present invention has been completed, and the configuration of the present invention will be explained below.

The water-repellent lubricant for tapping of the present invention contains at least one kind of aliphatic alcohol, aliphatic amide, or an ethylene oxide propylene oxide adduct of glycerin, polyethylene glycol, and a rust preventive agent as main components. Therefore, we found that a mixture of these main components has a lower frictional coefficient in the high temperature range than conventional water-insoluble cutting oils, and from this fact, even water-soluble oils can be used in tapping processing, which has severe cutting conditions. I put it out.

However, rather than simply mixing the above main components appropriately, at least one kind of ethylene oxide propylene oxide adduct of aliphatic alcohol, aliphatic amide or glycerin is added in an amount of 2 to 55% by weight, polyethylene glycol 5
~6% by weight, characterized in that the rust inhibitor contains 2-4% by weight. The above mixture must have a low viscosity when it is automatically refueled using an integrated supply device, so it is diluted with water by 5 to 4 times. It can also be used in a state in which polyoxyethylene polypropylene glycol is added.In the main components of the present invention described above, the aliphatic alcohol is an aliphatic alcohol having 12 to 18 carbon atoms, such as lauryl alcohol, oleyl alcohol, etc. Alcohol, stearyl alcohol, oxo alcohol, trimethylolpropane, etc. can be used.

Further, the aliphatic amide is an aliphatic amide having 12 to 18 carbon atoms, and for example, laurylamide, oleylamide, stearylamide, oxoalcoholamide, etc. can be used.

The reason why aliphatic alcohols and aliphatic amides having 12 to 18 carbon atoms are used is to improve the lubricity and fluidity of the lubricant. However, if it is more than 1 sand thick, the fluidity will be insufficient.

Further, the molecular weight of the ethylene oxide propylene oxide adduct is in the range of 1000 to 10000, and the molecular weight is 1
If it is less than 000, the lubricity is insufficient, and if it is more than 10,000, the solubility decreases and it cannot be used.

And the ratio of ethylene oxide and propylene oxide is 30 to 9% by weight of ethylene oxide, preferably 4% by weight.
0 to 6% by weight and 3% by weight of ethylene oxide
If it is less than 9% by weight, the solubility will decrease, and if it is more than 9% by weight, the lubricity will be insufficient. If the molecular weight of polyethylene glycol is less than 1000, the lubricating activity will be insufficient, so polyethylene glycol should have a molecular weight of 1000 or more, preferably 1000 to 1000.
Use one in the range of 25,000.

As the rust preventive agent in the present invention, already known ones can be used as appropriate, such as monocarboxylic acids, dicarboxylic acids, hydroxy fatty acids, sarcosine derivatives, aromatic carboxylic acids, alkalis of paraffin oxides, alkali metals, etc. Also suitable are amine salts, sulfonates, carboxylic acid partial esters of polyhydric alcohols, amines, phosphoric acid and phosphates.

As described above, the present invention is characterized by containing at least one kind of aliphatic alcohol, aliphatic Z aliphatic amide, or an ethylene oxide propylene oxide adduct of glycerin, polyethylene glycol, and a rust inhibitor in a specific range. If one or more types of ethylene Z oxide propylene oxide adducts of aliphatic alcohol, aliphatic amide, or glycerin are present in an amount of 55% by weight or more, the solubility decreases;
If it is 5% by weight or more and 2% by weight or less, a sufficient effect of the combination with polyethylene glycol (ability to lower the coefficient of friction) cannot be expected.

Similarly, if the content of polyethylene glyco2ol is 6% by weight or more and 5% by weight or less, a sufficient effect cannot be expected when used in combination with the ethylene oxide propylene oxide adduct.
Furthermore, if the rust preventive agent is within 4% by weight, the rust preventive power is sufficient.
It is not necessary to add more than 4% by weight, and if it is less than 2% by weight, the antirust ability will be insufficient. By containing each of these components within the above ranges, a lubricant for tapping that is water-repellent and can withstand severe cutting conditions is provided.

By diluting this water-repellent lubricant with water, it can be continuously supplied with oil using a lubricating device, and the tapping operation can be significantly improved. Furthermore, since the lubricant according to the present invention is water-soluble, even if it is mixed into a water-soluble cutting fluid used for purposes other than tapping, it will not cause the fluid to rot prematurely.
Does not cause deterioration of the working environment. That is, it is said that a water-soluble cutting fluid becomes putrid if one living bacteria per lcc is present.

Therefore, in the water-dropping cutting fluid used for purposes other than tapping, tapping base used in tapping, approximately 5% by weight of a non-water-resistant lubricant based on sun oil, and 1% by weight of sludge.
When mixed with about 6% by weight, the water-repellent cutting fluid becomes about 25% by weight.
After a day passes, the number of viable bacteria decreases to about 107, which causes the product to rot and its lifespan to decrease significantly. However, even if the water-soluble lubricant of the present invention is mixed into the above-mentioned water-soluble cutting fluid, it will not cause spoilage because it does not contain grease or mineral oil, and it will not spoil even after 70 to 80 days. The lifespan will be doubled. When the water-soluble cutting fluid rots, it produces a foul odor, so aeration is performed, but if aeration is stopped to save energy, the working environment will become significantly solubilized and cutting performance will also deteriorate. However, if the water-soluble cutting fluid does not spoil over a long period of time, this will not occur. Examples of the present invention will be described below, and the following four types of water-soluble lubricants of the present invention were used in each example.

Inventive product 1 Inventive product 3 Inventive product 4 Example 1 {1} Inventive product 1 ■ Mixture of polyethylene glycol and rust inhibitor (3}
Mixture of ethylene oxide propylene oxide adduct and rust inhibitor '4' Anhydrous cutting oil (water-insoluble cutting oil) A Bauden type adhesion slip test was conducted on the above '1} to (4) under the following conditions.

Conditions Sliding speed 0.66 side/sec Load vehicle
lk9 Measurement temperature: 100-25,000 Side test piece: 2475 The results of the test are shown in FIG.

For '1}, the coefficient of friction hardly changed due to temperature changes, but for ■, it changed somewhat due to temperature changes, and for '3' and ■, it changed significantly.

Example 2 Regarding products 1, 2, 3, and 4 of the present invention, tapping base (tapping paste CIOI manufactured by Nippon Craft Oil Co., Ltd.), and commercially available water-soluble cutting fluid (manufactured by Daido Chemical Co., Ltd.), 1
Tapping was carried out under the following conditions using a straight tap with -8 taps and 3 taps with a bevel.

The results are shown in the table below. Conditions Village to be cut S4$ Lower hole Pine. 20 reamer machine radial drilling machine tap 1-8-GH1 3 grooves - 3 threads As is clear from the table above, each of the products of the present invention and the tapping base can be used at a cutting speed of 13.3/min, but commercially available water-soluble When the cutting oil is used at a cutting speed of 13.3 skin/min, the machine stops and cutting becomes impossible.

Therefore, the product of the present invention can be used for high-speed cutting and can greatly contribute to productivity. Example 3 Regarding products 1, 2, and 3 of the present invention, commercially available water-soluble cutting fluid 1 (Simiron M Kai-0, manufactured by Daido Chemical Co., Ltd.), and commercially available water-soluble cutting fluid 2 (Cincinnati Milacron FS-40, USA) The frame assembly was tapped under the following conditions.

The results are shown in the table below. Conditions Part name Frame assembly IJ material SAP day 45 bottom hole 13
．． 50 reamer tap 1-3-GH1 3-groove-3-gear machine radial drilling machine As is clear from the above table, the product of Tanimoto's invention has a one-pitch sound in water.
Even after dilution and triple dilution, no settling occurred in the tap, and no hole plucking or poor accuracy occurred.

On the other hand, with commercially available water-soluble cutting fluids, tap processing is possible when used as an undiluted solution, but when diluted with water, deposits occur on the taps after 2 to 3 holes, making them unusable due to hole peeling and poor accuracy. From the above results, it is clear that the water-soluble lubricant of the present invention has excellent performance.

Example 4 The table below shows the percentage of machine operation loss time (the time the machine is stopped to apply paste to the taps) when a conventional tapping base is used to tap various parts in a large machining center. .

As is clear from the table above, when coating with a evening base, there is an operational loss of 5 to 22.5% regardless of the type of workpiece, which significantly impedes productivity, but when the product of the present invention is used The operating loss rate is 0%.

[Brief explanation of drawings]

The drawing is a graph showing the results of Example 1 of the present invention.

Claims (1)

[Claims] 1. Aliphatic alcohol having 12 to 18 carbon atoms, 12 carbon atoms
-18 aliphatic amides or glycerin ethylene oxide propylene oxide adducts, at least one ethylene oxide propylene oxide adduct having a molecular weight in the range of 1000 to 10000 is 2
-55% by weight, 5-60% by weight of polyethylene glycol whose molecular weight is 1000 or more, and 2-55% by weight of a rust inhibitor.
40% by weight, with the remainder being water. 2 C12-18 aliphatic alcohol, carbon number 12
-18 aliphatic amides or glycerin ethylene oxide propylene oxide adducts, at least one ethylene oxide propylene oxide adduct having a molecular weight in the range of 1,000 to 10,000 in an amount of at least 2 to 55% by weight. A water-soluble lubricant for tapping processing, characterized in that it contains 5 to 60% by weight of polyethylene glycol having a molecular weight of 1000 or more, 2 to 40% by weight of a rust preventive agent, and a paste agent, with the balance being water. agent.