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Which factors should we consider when choosing water-soluble cutting fluid?
(1)The type of water-soluble cutting fluid.
(2) Processing methods.
(3) Material of workpiece.
(4) Biological stability.
(5) Without skin irritation.
(6) Resistance to oil.
(7) Safety, healthy and environment protection. |
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How to extend the life of water-soluble cutting fluid?
The key point to extend the life of water-soluble cutting fluid is proper daily maintenance to prevent bacteria multiply in the fluid.The main maintenance includes:
(1) Control the spilling oil of machine strictly,and exclude the oil from the oil tank regularly.
(2) Avoid rags, tools, food residue and other rubbish into the oil tank of machine.
(3) Turn on the pump to increase the oxygen content of fluid when long time shutdown. |
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What problem will low concentration of water-soluble cutting fluid cause?
(1) Poor surface finish.
(2) Rust the iron workpiece and machine.
(3) Increase the wear of tools and grinding wheels,and decrease using life.
(4) The fluid becomes metamorphism and smelly easily. |
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What will cause by different water when using water-soluble cutting fluid?
(1) If the water is too soft,may cause foam problem and affect the processing.
(2) If the water is too hard,may cause the dissolve out of oil and soap and affect the anti-rust performance of cutting fluid. |
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What will cause the breeding of bacteria in water-soluble cutting fluid?
(1) There is bacteria in the configuration,such as the bacteria in the water.
(2) Bacteria in air get into the cutting fluid.
(3) Be infected by the transfer of workpieces between the process.
(4) Bad habits of the operators,such as threw rubbish into the tank.
(5) Bad cleanliness of machines and workshops.
(6) Cutting fluid contains the necessary nutrients for bacterial breeding. |
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Why do some countries have explicitly banned the use of diethanolamine (DEA) in water-soluble cutting fluid?
Because the smost or mist of diethanolamine (DEA) will irritate eyes, nose, throat and lung severely,even may cause liver and kidney damage. |
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Why do some neat cutting oils induce colour change on non-ferrous metals?
Certain neat cutting oils contain active lubricant additives which cause colour change in machining non-ferrous metals. Therefore, it is advisable to use straight oils without active lubricant additives to cut non-ferrous metals. |
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Why should we consider the viscosity index as same as viscosity when choosing hydraulic oil?
The viscosity index of hydraulic oil means the change of viscosity affected by temperature. The viscosity index of indoor mid- and high- pressure hydraulic machines¡¦ hydraulic oil should be above of 95, to ensure the viscosity is not too high to help the pump suction at low temperature,or too low to cause pressure decrease, temperature rising and wear increase at high temperature. |
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When the pressure in the mechanical system is not high enough, shall we use another hydraulic oil with higher viscosity to solve the problem?
No. Increasing the viscosity can increase the pressure in a short time. However, it will induce detrimental effect to the machinery. Almost all new equipment has specified the requirements of hydraulic oil for its operating system. If do so, it will cause damage to the pumps and shorten the working life of entire system. |
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Under what circumstances shall hydraulic oil be changed?
It depends on whether
(a) the pressure of the system becomes lower (without leakage)
(b) the viscosity of hydraulic oil changes significantly
(c) the oil emits rancidity
(d) the oil has been emulsified. |
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Which factors should we consider when choosing punching oil?
(1) Punching process.
(2) Material of workpiece.
(3) The thickness of workpiece.
(4) Requirement of volatile residue.
(5) Anti-rust requirement.
(6) The smear way of oil.
(7) The shape of workpiece.
(8) The cleaning requirement of follow-up processing. |
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Why do most customers choose volatile punching oil for sheet punching?
Because after punching with volatile punching oil, the solvent will evaporate from the surface and won¡¦t pollute the workpieces, benefit the follow-up processing and cleaning. |
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Why most drawing oils choose chlorine extreme pressure additive?
Because chlorine extreme pressure additive supplies strong adhesion and benefits the form of film on the surface. At the same time,the temperature of drawing is lower than cutting,and chlorine extreme pressure additive performs even better at this temperature. |
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Why should we consider the NLGI level when choosing grease?
According to the work penetration,grease is devided into nine levels in NLGI,including 000¡B00¡B0¡B1¡B2¡B3¡B4¡B5¡B6.It means the hardness, consistency and mobility of the grease.The higher of NLGI level,the more sticky and hard to fill the friction gap,as same as the larger friction; the lower of NLGI level,the better of mobility,but easy to lose. |
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Why do most steelworks, rolling mills and other steel companies choose calcium sulphonate complex grease as a lubricant?
Because calcium sulphonate complex grease supplies excellent water resistance and thermal stability, especially for the harsh conditions such as water rinsing, high temperature or high loading.It is perfect for the steel industry. |
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What is the difference between H1 and H2 level in NSF certification?
NSF means National Sanitation Foundation. NSF H1 level indicates that the lubricant is non-toxic and can be applied to the machines which have the opportunity to contact with food. NSF H2 level indicates that the lubricant is non-toxic,but not recommended for the machines which have the opportunity to contact with food. |
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Shall we use kerosene instead of EDM oil for electro-discharge machining?
No. The flash point of kerosene is extremely low and it is very easy to burn. The flash point of typical EDM oil must be above 100¢J. |
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What is the difference between silicone and non-silicone mould release agents?
Silicone based mould release agent is not suitable for processes involving secondary treatment work such as galvanizing, painting or silk-screening, etc. In these cases, non-silicone mould release agent shall be applied. |
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Even though the work piece has been coated with rust inhibitor, the material still rust. Why?
It may be due to wrong use of rust inhibitor. If the surface of work piece is not clean enough and completely dry, coating of rust inhibitor will just trap the contaminants and moisture which in turn promote rusting. |
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Why can¡¦t we spray the anti-rust spray too close to the workpiece?
Closing spray will make the active ingredient accumulation in the center and proliferation to around.It seems like watermark and can¡¦t form a dense protective film to affect anti-rust performance.The proper spraying way is to put the can vertical and keep 15 to 30 cm distance with the mold,then spray with ¡§Z¡¨ style evenly.You can repeat the action above if you need. |
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