The hottest cutting fluid provides reliable guaran

2022-08-06
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Cutting fluid provides reliable guarantee for efficient machining (II)

2 Maximum force, breaking force, peeling force, tensile strength, shear strength, tearing strength, maximum deformation, yield force, elongation, elastic modulus, ring stiffness, non proportional elongation, minimum force in the section, average force in the section, force at constant elongation The welding strength and peel strength calculated automatically by the computer are selected according to the workpiece material. Generally, these standards have strict provisions on sample preparation and experimental methods. The machinability of workpiece material is of great significance to the selection of cutting fluid. The difficulty of machining is different according to the specific conditions and requirements of machining. During rough machining, it is required that the tool wear is slow and the machining productivity is high; When finishing, the workpiece is required to have high precision and small surface roughness. For difficult to machine materials, cutting fluid with high activity, anti-wear and extreme pressure additives shall be selected; For easy machining materials, the cutting fluid without EP additives is selected. From the point of processing workpiece materials, there are cast iron, aluminum, titanium alloy, aluminum alloy and alloy steel

(1) cutting fluid with strong anti rust function shall be selected for cast iron processing. When cast iron and bronze are brittle materials, chipping chips are often formed during cutting, which is easy to flow around with the cutting fluid and flow into the guide rail of the machine tool to cause component damage. Emulsion with good cooling and cleaning performance can be used

(2) when processing aluminum products, due to the stickiness and tailing of some grades of aluminum, free cutting cannot be used. Some aluminum alloys are very hard and wear-resistant, and need cutting fluid with high lubricating performance

(3) when cutting nonferrous metals and light metals with titanium alloy, aluminum alloy and alloy steel (added), the cutting force and cutting temperature are not high. Mineral oil and high concentration emulsion can be used. When cutting alloy steel, if the cutting amount is low and the surface roughness requirements are small (such as broaching and thread cutting), cutting fluid with excellent lubrication performance is required, extreme pressure cutting oil and high concentration emulsion can be selected

3. According to the selection of machining tool materials

in some precision high-strength machining (such as broaching, tapping, deep hole and drilling), the cutting fluid needs to have excellent lubrication performance. Extreme pressure cutting oil and high concentration emulsion can be selected

(1) the tool steel tool has poor heat resistance at 200 ~ 300 ℃, and it loses its hardness at high temperature. Therefore, it is required to use cutting fluid with good cooling performance and low concentration

(2) when high-speed steel tools are used for high-speed rough cutting, the cutting amount is large and a large amount of cutting heat is generated, so water-based cutting fluid with good cooling property should be used; If high-speed steel tools are used for medium and low-speed finish machining, oil-based cutting fluid or high concentration emulsion is generally used, which can reduce the friction adhesion between the tool and the workpiece, inhibit the formation of cutting tumors, and improve the machining accuracy

(3) cemented carbide tools have high melting point and hardness, good chemical and thermal stability, and much better cutting and wear resistance than high-speed steel tools. Oil based cutting fluid can be used in general machining. In case of heavy cutting, the cutting temperature is very high and it is easy to wear the tool very quickly. At this time, the flow of cutting fluid should be increased to ensure adequate cooling and lubrication

(4) ceramic tools, diamond tools and cubic boron nitride tools all have high hardness and wear resistance. Generally, cutting fluid is not used during cutting, and sometimes water-based cutting fluid can be used

solutions to common problems of cutting fluid in machining

after selecting a suitable cutting fluid, its quality control and management need to be done well to achieve cost reduction and efficiency increase. The quick solutions to prevent possible problems of cutting fluid mainly include:

1 The problem of bacterial odor not only disgusts the operators, but also sometimes causes the cutting fluid to deteriorate and damage the workpiece, making it difficult to maintain the filter equipment and increasing the hidden costs such as tool life. Once it is found, it is necessary to add antibacterial agent immediately for control, and pay attention to adding a small amount of new liquid every day

2. Foam problem, which will lead to excessive consumption of cutting fluid, resulting in poor filtration and hindering the heat dissipation of the cutter head. In the highly agitated system, when the foaming cutting fluid enters the working area of the tool edge, too much foam will cause the problem of cutting fluid storage and make the tool life unstable. For this, non pure water can be added; Or add defoamer, but the long-term addition will affect the performance of cutting fluid

3. (seasonal) corrosion on the workpiece, tool and tool handle will reduce the surface finish and reduce the service life of the machine tool. In coastal areas or wet places, pay attention to the selection of cutting fluid with good anti rust performance, and pay attention to the application of anti rust oil between processes

4. Poor chip sedimentation will worsen the cooling effect and working conditions, resulting in higher costs. It is necessary to frequently start the cutting fluid circulation system, improve the filtration system, and improve the cleanliness of the coolant

5. Skin infection. Safety and environmental protection products that are not harmful or irritating to human body shall be selected as far as possible, and operators shall wear correct labor protection articles

good lubrication management can guarantee the normal operation and life extension of mechanical equipment, which is also one of the main topics of modern chemical plant management. The cost of cutting fluid accounts for about 2% of the production cost of the four key parts of the whole engine, but it can affect more than 70% of the overall processing cost. Therefore, we need to pay more attention to cutting fluid, control and use it harmoniously, save costs and improve benefits

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