Application of lubrication technology in metal processing technology

There are tribological problems everywhere in the process lubrication of metal processing equipment. It is an important field in which tribology technology is fully utilized and applied. As long as this work is emphasized, production costs can be reduced; energy consumption is reduced; pollution is reduced; Simplification; increased scientific and technological content. However, this important means is often overlooked in the actual production process. Some application examples are now organized as follows.

1. Processing stainless steel parts on lathe: processing stainless steel parts on C602-1 lathe (material Cr18Ni9V, outer diameter Φ44.8mm, hole Φ15mmX131mm) Originally used ordinary N32 full loss mechanical oil for cutting oil, tool life is short, especially hole machining tool average Processing 1 or 2 parts should be ground once. After the metal processing WeChat self-changing with special stainless steel metal processing oil, the tool life is extended by 10 times under the same working conditions, and the surface roughness of the machined workpiece is also obviously improved.

2. How to do long-term communication between multi-axis automatic lathe cutting oil and lubricating oil? Domestic multi-axis automatic (for example, C2150-6D six-axis automatic lathe), because the machine's own lubricating oil tank is small (only 40kg), and it is difficult to return to the crude oil tank after the lubrication system oil pumping out, so that the 40kg small fuel tank is not long after driving. Being sucked dry. A lot of oil runs into the large fuel tank of cutting oil. In order to maintain balance, many machine tool users will cut and lubricate the two large-sized fuel tanks, causing the oil tank to be seriously polluted by cutting oil, resulting in serious machine wear and reduced precision. fast. The improvement measures are as follows: (1) promote the use of cutting and lubricating dual-purpose oil (for example, RQ dual-purpose lubricating oil); 2 add a fine filter after the original lubrication system oil pump to ensure the cleaning of the machine lubrication system; 3 cancel the cutting oil tank, adopt two Molybdenum sulfide crayon lubrication tool or gas phase lubrication dry cutting device.

3. Is it necessary to use chlorinated paraffins for high-speed cutting worms? The production efficiency of cutting oil plus chlorinated paraffin can be increased by more than 10 times, but chlorinated paraffin is a toxic and harmful substance and cannot be used for a long time. The same effect can be achieved by using MoS2 oil as the cutting fluid.

4. Lubrication of deep hole machining of camshaft: When a factory processes a deep hole of Φ8mmX800mm camshaft, due to improper selection of cutting fluid, it is necessary to repair the deep hole drill three times for each machining. Since the addition of 5% to 7% "ER" metal conditioning agent to the original cutting fluid, the lubrication performance between the tool and the workpiece is greatly improved. Under the same conditions, the deep hole of the three camshafts is machined once. The deep hole drill life is extended by 9 times.

5. What should I do if there is uneven sparking when grinding a large grinding machine? When dressing the grinding wheel, the problem of uneven grinding spark often occurs, especially when the micro feed (ap=0.015mm) is more serious. For the cooperation of the mechanics, the author is in the headstock of the grinding head (the original liquid) The oil additive is added to improve the oil film strength of the bearing, so that when the radial thrust from the diamond pen is transmitted to the bearing when the grinding wheel is repaired, the boundary lubrication is no longer generated, and the grinding spark is even.

6. The top lubrication of the grinding machine: When grinding the slender shaft (including turning), the lubrication problem between the dead tip and the center hole of the workpiece is often neglected as a trivial matter, often adding some butter (calcium grease) at the top. Lubricated, but sometimes for some large workpieces (slim shaft) due to heavy load, plus the grease at the top is easy to be diluted by the emulsion lubrication, resulting in the center hole being bitten, dead top burn, directly affecting the workpiece machining accuracy More serious, sometimes a top break occurs, and the workpiece flies out of the injured. Metal processing WeChat analysis, due to the small contact area between the center of the workpiece and the tip of the pair of friction pairs, large load per unit area, harsh lubrication conditions, and later changed to use water and grinding MoS2 lithium grease, the above problems will be solved.

7. The relationship between band saw blade and lubricant: G4020 band sawing machine has high production efficiency, but the saw band often breaks and is analyzed by tribological theory. The original band sawing machine has poor lubricity with ordinary emulsion, and the workpiece acts on the saw band with frictional resistance. Too large, causing the ring saw band to break. To this end, we added 3% MB-202 white solid lubricant to the emulsion, and the life of the saw band was extended by 5 times under the same working conditions, and the surface roughness of the sawing cut was greatly improved.

8. Why does the wire rolling machine often leak oil? When a mill has a M10 stainless steel stud in a factory, the oil is trapped due to the “fluff” in the cutting fluid, which causes the machine to leak oil due to poor oil return and then add 5 to the original cutting fluid. The %JQ-1 anti-wear agent (developed by Kokusai Institute) no longer found new "fleece" in the cutting fluid. The reason is that the rolling die and the stainless steel workpiece generate a large amount of frictional heat and plastic deformation in the production of the wire to generate high temperature, which causes the original cutting oil to undergo chemical changes to form a "coke"-like "fluff".

9. Lubrication problem in extrusion tap processing: If the inner hole of steel is machined into a thread by extrusion tap, it is a non-cutting process, but this process is often affected by the lubrication technology, which affects the promotion of this advanced process. During the pressing process, there are two kinds of heat sources (ie, plastic deformation heat and friction heat). For the friction pair, the parts and the tool are melted together like the friction welding (so-called seizure), and it is a typical pole from the perspective of lubrication technology. Pressure lubrication phenomenon. To this end, we have applied MoS2 extreme pressure lubricant to the extrusion tap to solve this problem.

summary

(1) It can be seen from the above many examples that the tribological lubrication technology can play a huge role in metal processing processes such as metal cutting equipment and pressure processing equipment. Metal processing WeChat used to have similar problems in gold processing in terms of tool angle, hardness, cutting speed, machine tool category selection, etc., and it is not enough to analyze and improve the problems from the lubrication point.

(2) Under the current situation of vigorously promoting environmental protection and energy conservation, how to promote advanced lubricants and gas-phase lubrication dry cutting devices in the gold cutting process, no pollution, less pollution processing is more significant.

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