HLJH - a professional manufacturer and supplier of cutting oil in Taiwan.

Blog

Guide of Metal Working Fluid

Metalworking is the process of working with metals to create individual parts, assemblies, etc. To prevent burning and smoking, metalworking fluid (MWF) is the most important role which is the name given to a range of oils and other liquids. During machining, MWF is used to reduce heat and friction, and to remove metal particles, to cool and lubricate metal work-piece.

The oils, coolants and lubricants used in metalworking shops are often overlooked as an opportunity to improve process efficiencies. However, the standard machining or grinding shop sees the lubricant and coolant as the least important factor in the total cost of machining and the last place to look for process improvements. Metalworking fluids work well, until they don’t. And when they go wrong, it can be a show stopper.

We are going to sharing more articles about metal working for your reference as below. For sure, if you have any unclear or MWFs questions, you can click contact us or email to our service directly.

Result 1 - 9 of 9
During conventional machining or metal cutting, it will cause a significant amount of stress, heat, and metal chips. There are two types cutting oil for metal working, water soluble cutting fluid and neat cutting oil which can prevent over heating thus they elongate the life of the machinery and tools, and achieve cooling and lubricating properties in the process of machining. Read More
During metal machining, the heat can damage both the cutting tool and the work piece if the right kind of cooling doesn’t take place at the cutting edge. In order to select the best oil, you need to gather some basic information relevant to the selection criteria. For purposes of simplicity, you need to know the metals in use, and consider the predominant machining operations at first. New machines, changing environmental concerns, machine types, tooling specifics all combine to limit the effectiveness or applicability of the cutting oil Read More
The most common cutting fluid problems encountered by manufacturers (users) typically fall into the following five areas: foam, corrosion, residues, odor and dermal irritation. Most metal cutting fluids, in addition to cooling and lubricating which also have good cleaning properties to help keep machines clean. However, they also foam when agitated. As a result, foam in oil is an issue which is typically considered to be an undesirable property in a metalworking fluid. The basic cause is entrained air within the fluid caused by mechanical or chemical processes; include the quality of the water used for mixing, and the degree of agitation in the system. You can get rid of foam in a coolant tank temporarily by adding defoamers, but some defoamers helps to emulsify leak oil, which is food for bacteria. Therefore, you should always try to find what causes the foam. Read More
Metalworking fluids(MWFs), mainly used as 2–10% emulsions in water which are among the commonest chemical exposures. Most MWFs are mixtures of base oil and auxiliary substances such as emulsifiers, antimicrobial agents, corrosion inhibitors, extreme pressure additives, etc. which are strongly alkaline, and contact with skin can remove natural oils and damage the proteins in the skin's protective outer layer so that skin's water content is diminished, and the result is dry, scaly, inflamed skin. Aggressive pH, this is not the only cause, though. Metal fines, particularly those containing chromium, zinc, cobalt and nickel are often the culprits in machine shop dermatitis, along with improper fluid concentration, and additives that are out of balance. Contrary to popular belief, bacteria do not cause irritant contact dermatitis, although bacteria can aggravate the condition and cause secondary infections. These skin diseases as well as several minor ones associated with exposure to lubricating coolants can be prevented by measures designed to minimize contact and to improve personal hygiene. Here are a few tips which can prevent this issue before happening. Read More
If you’ve worked in a machine shop or metalworking facility for any length of time, you have no doubt encountered a variety of unpleasant odors. Perhaps you’ve noticed that “rotten egg” or “Monday morning” smell (bacteria) when metalworking coolants are allowed to “rest” over the weekend, usually under a blanket of surface tramp oil. Regardless of any situations, your nose is alerting you to the serious problem of microbiological growth in your water-based metalworking fluids. Bacteria grow in coolant sumps, producing a nasty smell and biomass that can clog filters and screens. In other cases, sulfur odors from unchecked bacterial growth have gotten so bad that plant and office personnel have refused to work. Obviously, when things get to this point, there will be considerable expense and inconvenience to remedy the situation. Change to a different brand and the problem will be solve, is that correct? Perhaps, not is. Even the best coolants will eventually succumb to microbiological attack if they are not properly maintained. Good coolant maintenance begins with consistent concentration control. Most coolants are formulated to produce an alkaline, high-pH environment that inhibits microbiological growth. Some contain biocides designed to kill micro-organisms. Neither of these fluid defenses will function effectively if the additive ingredients are not present in the proper proportions. Failure to check and adjust coolant concentration at least daily is one sure way to start growing “bugs.” Check the fluid pH with test strips on a weekly basis. For most coolants, pH values below 8.5 indicate developing microbiological issues. The next step is to use a good sump cleaner to flush the reservoir during change outs. This will ensure that any remaining bacteria, biomass, and tramp oil are properly dealt with before the new coolant is installed. During service outages, inspect the reservoir and conveyor channels for the presence of biomass. In the worst cases, these may have to be physically removed. Read More
Cutting fluids serve a number of key lubrication functions, cooling to preserve tool life, remove chips, and surface protection to preserve the machined part from corrosion. The usage and environment of metal cutting fluids cause them to change over time. Therefore, fluid maintenance is crucial for a better application of the fluid. Read More
Decreased grinding fluid performance? Excessive corrosion?Maybe it’s time your water quality was evaluated. Coolants contain ~90% water, with the remainder containing additives to prevent from corrosion, foaming, and bacterial growth. However, while the quality of these additives is precisely controlled by the coolant manufacturers, the water quality varies depending on its source. Therefore, your water quality should be monitored before diluting the concentrated coolant. Factors that affect water quality are water hardness, pH, and the presence of chlorides, sulfates, and lead. Monitoring the pH level can identify bacterial growth. Generally speaking, hard water is the amount of calcium and magnesium salts, expressed in milligrams of calcium carbonate per liter of water (ppm). A pH of 7 is defined as natural. Water below pH 7 is acidic, above pH 7 is basic. Most commercially available coolants are basic in their concentrated form with pH levels between 9 and 12. For example, the ideal hardness levels for glass working coolant are between 80 to 110 ppm. Water with hardness value below 70 ppm is considered soft and may result in foaming whereas hardness value that exceeds 200 ppm is consider hard and may result in separate oil from water. Hard water contains sodium and potassium salts, which can cause machine and work-piece corrosion. It can also cause significant discoloration on the surface of steel and aluminum parts. Besides, hard water is difficult mixed with coolant, so it easily separate oil and water, and part of the concentrated liquid is consumed to soften the water, and cannot function as a cutting fluid. In order to ensure the performance of cutting fluids, adding more concentrated fluids increased the cost. 【TOTAL HARDNESS (ppm) EVALUATION】 ■ Very soft:0 - 49 ■ Soft:50 - 124 ■ Medium:125-249 ■ Hard:250-369 ■ Very hard:370 and above ▼ Recommended standards for water hardness of cutting fluid Recommended water hardness is between 50ppm. And it resulting in poor cleaning performance. It is recommended to consult relevant professionals for on-site inspection and analysis. Read More
The rust preventive oil protects metal surfaces and machine parts before, during and after machining as well as during storage at factory. This way, semi-finished products and finished parts are protected until further processing and assembly, or during transport. Read More
Hydraulic oil is used to transfer power within hydraulic machinery and equipment. On the other hand, hydraulic oil and hydraulic fluid are terms that are sometimes used interchangeably. Read More
Result 1 - 9 of 9

Press Release