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CNC rough machining and semi finishing machining

Rough machining, semi finishing, finishing of all parts of the processing process, so we must carry out a thorough process analysis, arrange a reasonable processing sequence, select the appropriate cutting tools and cutting parameters, in order to ensure the machining accuracy of parts and improve production efficiency.

Arrange tool position number reasonably. The machining center needs to use a variety of tools, sometimes the shape of the tool is very different, so it is necessary to leave enough space for tool change to avoid tool collision.

In order to improve the work efficiency of high-speed Gong machining, the tool is usually pre adjusted outside the machine tool after it is installed on the tool holder, and the tool parameters are input into the corresponding address of the tool table.

For the convenience of debugging program and adjusting work steps, different working steps can be programmed into subprograms, and the main program mainly carries out tool changing and subroutine calling.

Because there are many steps in high-speed Gong machining, and tool change is required many times, so the error rate of manual programming is high. Therefore, it is necessary to check the program carefully and verify it by trial operation. During calibration, it is better to check the tool path at each plane position. If the main plane is XY plane, elastic pen or water pen can be clamped on the main shaft to draw the running track in trial operation mode. The programming features of the program are that the shape of the workpiece processed by small machining center is complex, and there are many kinds of cutting tools used. The whole process from rough machining, semi finishing to finishing must be completed after one clamping. Therefore, the program is more complex. The following problems should be considered in programming.

  1. Analyze the drawings carefully to determine the reasonable process route.
  2. The size and specification of the tool should be selected, and the actual size measured should be filled into the tool card.
  3. Determine the reasonable cutting parameters. It mainly includes spindle speed, back feed rate and so on.
  4. Sufficient space for automatic tool change shall be reserved to avoid collision with workpiece or fixture. It is suggested that the tool change position should be set at the origin of the machine tool.
  5. In order to check and debug the program, the processing contents of each step can be arranged into different subprograms, and the main program mainly completes tool change and subroutine call. This procedure is simple and clear.
  6. Check and test run the compiled program, and pay attention to whether there is interference between the tool, fixture or workpiece. When checking the m, s and t functions, it can be carried out in the z-axis locking state. Processing programming need to pay attention to the first, do not modify the setting of machine parameters. 2、 Do not change the file format of the computer. 3、 Note that micro connections are added and checked before each incoming. 4、 Remove stamping after the body, if you need to add stamping should focus on inspection, and stamping. 5、 Program file cannot exceed 2, program cannot run. 6、 Stamping sequence from inside to outside, if there is an accurate stamping part will be preferred. 7、 Each width is less than 140 mm or stamping position is less than 40 mm. The length less than 300 mm cannot be punched. (Note: for composite die, except the influence of position, the cutting angle is less than 30 mm, and the clamp should be moved to a reasonable position. When the cutting angle is less than 30 mm or in effect, the distance of clamping position, the reasonable position of 150 mm to 250 mm and the cutting angle clamp on the computer must be the same as the actual position). The digital control system can control the machine tool to automatically select and change the cutting tool according to different working procedures, and automatically change the spindle speed, feed rate, the motion track of the cutter relative to the workpiece and other auxiliary functions. The machining center can complete the processing of multiple processes on several surfaces of the workpiece in turn. In addition, it has a variety of tool changing or selecting functions, which greatly improves the production efficiency. Due to the centralization of working procedure and automatic tool change, the time of clamping, measuring and adjusting of machine tool is reduced, so that the cutting time of machine tool reaches about 80% of the starting time of machine tool (only 15-20% for ordinary machine tools); meanwhile, the time of turnover, handling and storage of workpieces between working procedures is reduced, and the production cycle is shortened, which has obvious economic effect

The importance of CNC motorized spindle

The importance of CNC motorized spindle 1. High speed CNC must first verify the parameters of the input tool starting point. It is strictly forbidden to knock or impact the rotor end of the spindle motor during operation. The operator is required to pay attention to the starting point of z-axis during tool setting to prevent misoperation. It is necessary to avoid the damage to the bearing of spindle motor caused by collision and knife binding during operation. Once there is knife binding phenomenon, stop the machine immediately, so as to prevent the bearing from being damaged by high-speed operation. Then, start running in from low speed, the time is slightly longer than normal running in time, until the motor runs smoothly and normally.

  1. The high-speed CNC should ensure that the cooling circulation system of the engraving and milling machine motor works normally before starting up and using. Then turn on the spindle motor. It is forbidden to use the spindle motor without cooling. The working environment temperature should not be higher than 30 ℃. When the ambient temperature is higher than 30 ℃, air conditioner or refrigerator should be used for forced cooling of spindle motor.
  2. According to the principle of running from low speed to high speed, the spindle motor should be preheated step by step. When the motor reaches the required speed, the no-load operation is stable, and the temperature is cooled, then the processing can be carried out. Only in this way can the better machining accuracy be ensured.
  3. When planning the tool path, it is necessary to ensure that the force of the spindle motor is reasonable, and the engraving process should be carried out according to the knife principle provided by the technical service personnel. It is necessary to prevent the vertical cutting tool and prohibit the spindle motor from overload operation, so as to ensure the normal service life of the spindle motor.
  4. Generally, the spindle motor should be disassembled, cleaned and reassembled for use after running for about one year, so as to ensure the bearing accuracy and prolong the service life. In order to ensure the normal and good work of the spindle motor, its assembly must be carried out by experienced professional operators in a clean and clean environment, as well as using appropriate tools. Do not knock at random. For the temporarily unused motorized spindle, the residual water in the water chamber shall be blown out with compressed air, and the sleeve and shaft head shaft hole shall be oiled for rust prevention and placed in a cool and dry place.

Control system of CNC machine tool

Generally, the control system of CNC machine tool can control the machine tool according to the digital program instruction to realize the automatic start stop, reversing and speed change of the spindle. It can automatically control the feed speed, direction and processing route for processing. It can select the tool and adjust the cutting amount and travel track according to the size of the tool. It can complete all kinds of auxiliary actions needed in the processing. When we use machine tools to process parts, we usually need to control the various actions of the machine tool, one is to control the sequence of actions, the other is to control the displacement of each moving part of the machine tool. When machining with ordinary machine tools, such operations as start-up, stop, feed, change direction, change speed of spindle and switch cutting fluid are all controlled by manual. When automatic machine tool and copying machine tool are used for machining, the above operation and motion parameters are controlled in the form of analog quantity through the designed cam, profiling and blocking device. Although they can process more complex parts, and have certain flexibility and versatility, the machining accuracy of parts is affected by the manufacturing accuracy of cams and profiling machines, and the preparation time of working procedure is also very long 。

When machining parts with large CNC machine tools, it is only necessary to compile program codes in the form of digital information, such as part graphics, process parameters and processing steps, and input them into the control system of machine tools, and then convert them into the command signals of driving servo mechanism after calculation and processing, so as to control the coordinated action of various parts of the machine tool and automatically process the parts. When the processing object is changed, it is only necessary to re write the program code and input it to the machine tool, and then the NC device can replace most of the functions of human brain and hands, control the whole process of processing, and produce any complex parts.

After a speed command is given in MDI mode, the spindle does not move a little bit. At first, it is suspected that the shift signal is incorrect. When the z-axis gearbox is disassembled, it is found that the shift of the spindle gear is normal and in place signal is correct. But the spindle doesn’t rotate. In principle, if the spindle encoder or the spindle is not powered on, it will cause an alarm. Therefore, I have ruled out the above two doubts. Do you want to know what good solutions are available for such problems?

The solution can refer to 1: first of all, we should know whether we can see the parameters after 9000, and if we can see them, whether the parameters are needed. I have encountered such a situation, it is 0i-MC system, all axes are normal, that is, the main shaft does not rotate. Later, we changed the parameters after 9000. I don’t know if 21i is like this

The solution can be referred to 2: there was an oi-m in the company before, and it was found that it was caused by the clamping of the pneumatic valve of the tool arm. After the tool change, the tool arm should be ready for the next knife, but the knife arm did not put down, and there was no alarm. After the valve was replaced, it was ready. And whether there is a hydraulic fixture, the fixture is not tightened, or the clamping signal is disconnected.

Solution can refer to 3: first look at the spindle monitoring, turn the spindle by hand to see if there is a value? Is the value correct? In the past, there is no alarm and the spindle does not rotate. No monitoring value. Adjust the distance. Or replace it with a new one.

CNC machining clamping workpiece

  1. Before the workpiece is clamped, the surface should be cleaned, and there should be no oil stain, iron filings and dust, and the burr on the surface of the workpiece should be removed with a file (or oilstone).
  2. The equal high-speed rail used for clamping must be grinded flat by grinding machine to make it smooth and flat. The weight iron and nut must be firm, which can reliably clamp the workpiece. For some small workpieces that are difficult to be clamped, they can be directly clamped on the vise.
  3. The worktable of the machine tool shall be clean and free of iron filings, dust and oil stains.
  4. The pad iron is generally placed at the four corners of the workpiece, and the equal height pad iron should be placed in the middle of the workpiece with too large span.

Check whether the width and height of the workpiece are qualified according to the drawing.

  1. When clamping the workpiece, according to the clamping and placing mode of the programming operation instruction, it is necessary to consider avoiding the processing position and the situation that the cutter head may encounter the fixture during the processing.
  2. After the workpiece is placed on the pad iron, pull the table according to the drawing requirements. The length direction error is less than 0.02mm, and the horizontal error of the top surface X and Y direction is less than 0.05mm. The perpendicularity of the workpiece which has been ground on six sides shall be checked to see if it is qualified.
  3. After pulling the watch, the nut must be tightened to prevent the workpiece from shifting during processing due to the loose clamping.
  4. Pull the meter again to make sure that the error does not exceed the tolerance after clamping.
  5. Workpiece collision number: for the clamped workpiece, the collision number head can be used to determine the processing reference zero position. There are two kinds of collision head: photoelectric type and mechanical type. The collision selection method can be divided into middle collision number and single side collision number, and the steps are as follows:
  6. Collision counting method: photoelectric static, mechanical speed 450 ~ 600 rpm.
  7. Manually move the x-axis of the worktable to make the colliding head touch one side of the workpiece. When the colliding head just touches the workpiece and the red light is on, set the relative coordinate value of this point as zero; then manually move the x-axis of the workbench to make the collision head collide with the other side of the workpiece, and record the relative coordinates when the collision head just touches the work piece.
  8. According to the relative value minus the diameter of the bumping head (i.e. the length of the workpiece), check whether the length of the workpiece meets the requirements of the drawing.
  9. Divide the relative coordinate number by 2, and the value is the middle value of the x-axis of the workpiece. Then move the worktable to the middle value on the x-axis, and set the relative coordinate value of the x-axis at this point to zero, which is the zero position on the x-axis of the workpiece.
  10. Carefully record the mechanical coordinate value of the zero position on the x-axis of the workpiece in one of g54 ~ G59, and let the machine tool determine the zero position on the x-axis of the workpiece. Once again, check the correctness of the data carefully.
  11. The procedure of setting the zero position of workpiece Y axis is the same as that of X axis.
  12. Prepare all tools according to the programming instruction.
  13. According to the tool data in the programming operation instruction, replace the tool to be processed and let the tool touch the height measuring device placed on the datum plane. When the red light of the measuring instrument is on, set the relative coordinate value of this point to zero.
  14. Move the tool to a safe place, manually move the tool down by 50mm, and set the relative coordinate value of this point to zero, which is the zero position of Z axis.
  15. Record the mechanical coordinate Z value of this point in one of g54 ~ G59. This completes the zero setting of the X, y, z axes of the workpiece. Once again, check the correctness of the data carefully.
  16. The one-sided collision is also to touch one side of x-axis and Y-axis of the workpiece according to the above method. Offset the relative coordinate value of x-axis and y-axis at this point. The radius of collision head is the zero position of x-axis and y-axis. Finally, the mechanical coordinates of x-axis and y-axis are recorded in one of G54-G59. Once again, check the correctness of the data carefully.
  17. Check the correctness of the zero point, move the X and Y axes to the side suspension of the workpiece, and visually inspect the correctness of the zero point according to the size of the workpiece. Two 报错 笔记

Operation steps of CNC machine tool

Confirm the model, size and allowance of processing blank according to the program sheet before operation, and sand and grind the blank

After operation, confirm the position of the workpiece and the processing sequence, and complete the table comparison

In the process of centring, if it is necessary to “split the rod”, the rotating speed is 501r / m. if the tool is used to divide the center, the speed depends on the tool. In this process, it should be noted that the data must be taken at the same height to ensure the accuracy of the split. After the separation, the “g0g54 x0y0” can be used for inspection

Before the formal processing, check and confirm whether the position of the workpiece is placed and whether the fetching is correct

C. Precautions in CNC machining

  1. Before machining in each program, it is necessary to strictly confirm whether the tool is consistent with the program
  2. When installing the tool, confirm whether the length of the tool and the selected tool holder are suitable
  3. In the same workpiece, each tool setting should be kept in the same area to ensure the accuracy of tool connection
  4. Try to blow with air in the roughening procedure and spray oil in the light knife program
  5. Clean the aluminum slag in the machine tool before the smooth knife oil injection to prevent the aluminum slag from absorbing oil
  6. During the operation of the machine tool, the operator shall not leave the machine tool or regularly check the operation status of the machine tool. If it is necessary to leave midway, relevant personnel must be designated to check
  7. If too much machining allowance is found in the process of machining, you must use “single section” or “pause” to clear x, y, Z values, and then manually mill them off, and then swing back to “zero” to let them run by themselves
  8. In case of tool collision during CNC processing, the operator must stop the machine immediately, such as pressing the “emergency stop” button or “reset key” button or setting the “feed rate” to zero
  9. It is forbidden to open the door when the machine tool is running to avoid flying knife or workpiece
  10. After the workpiece is off the machine, the burr must be removed in time
  11. When off duty, operators must make timely and accurate handover to ensure the normal follow-up processing
  12. Before shutdown, make sure that the tool magazine is in the original position and the XYZ axis is in the middle position. Turn off the power supply and the general power supply on the operation panel of the machine tool in turn
  13. In case of severe thunderstorm, the power supply must be cut off immediately to stop working

How to maintain CNC machine tools?

The key of preventive maintenance of CNC machine tool is to strengthen daily maintenance. The main maintenance work includes the following contents: daily inspection, weekly inspection, monthly inspection, quarterly inspection and half year inspection. The preventive maintenance of CNC machine tools is as follows:

  1. Daily inspection of CNC machining machine tools

Its main items include hydraulic system, spindle lubrication system, guide rail lubrication system, cooling system and air pressure system. Daily inspection is based on the normal situation of each system to detect. For example, when the process detection of the spindle lubrication system is carried out, the power light should be on, and the oil pressure pump should run normally. If the power light is not on, the spindle should be stopped and contact the mechanical engineer. Carry out maintenance.

  1. Weekly inspection of CNC machine tools

Its main items include machine parts and spindle lubrication system, which should be checked correctly every week, especially for machine parts, iron filings should be removed and external sundries should be cleaned.

  1. Monthly inspection of CNC machining machine tools

It is mainly to check the power supply and air in the dryer. Under normal conditions, the rated power supply voltage is 180v-220v, and the frequency is 50 Hz. If there is any abnormality, it should be measured and adjusted. The air dryer should be removed once a month, and then cleaned and assembled.

  1. Quarterly inspection of CNC machine tools

The quarterly inspection should be mainly carried out from the machine bed, hydraulic system and spindle lubrication system. For example, when checking the machine tool bed, it mainly depends on whether the accuracy and level of the machine tool meet the requirements in the manual. If there is any problem, contact the mechanical engineer immediately. When checking the hydraulic system and spindle lubrication system, if there is any problem, the oil should be replaced by 6ol and 20L respectively and cleaned.

  1. Semi annual inspection of CNC machine tools

After half a year, the hydraulic system, spindle lubrication system and x-axis of the machine tool should be inspected. If there is any problem, the new oil should be replaced, and then the cleaning work should be carried out. After being familiar with and mastering the knowledge of preventive maintenance, it is necessary to have a deeper understanding and necessary mastery of the causes and treatment of abnormal phenomena in the oil pressure system. For example, when the oil pump does not inject oil, the pressure is abnormal, there is noise and other phenomena, we should know what the main reasons are and what are the corresponding solutions.

The causes and treatment of abnormal phenomena in oil pressure system should be understood from three aspects

(1) The main reasons for the oil pump not injecting oil may be low liquid level in the oil tank, oil pump reverse, low speed, high oil viscosity, low oil temperature, filter blockage, excessive volume of oil suction pipe, air suction at the oil inlet, damage of shaft and rotor, etc. corresponding solutions are proposed for the main reasons, such as filling full oil, confirming the label, changing when the oil pump is reversed, etc.

(2) The pressure is abnormal, that is, the pressure is too high or too low. The main reasons are various, such as improper pressure setting, poor action of pressure regulating valve coil, abnormal pressure gauge, leakage of oil pressure system, etc. The corresponding solutions include dismantling and cleaning according to the specified pressure setting, changing a normal pressure gauge, and checking according to the system in turn.

(3) Noise is mainly produced by oil pump and valve. When the valve has noise, the reason is that the flow exceeds the rated standard, so the flow should be adjusted appropriately; when the oil pump has noise, the causes and corresponding solutions are also various, such as high oil viscosity and low oil temperature, and the solution is to raise the oil temperature; when there are bubbles in the oil, the air in the system should be discharged, etc.

Division of NC lathe working procedure

In NC lathe machining parts, the process should be divided according to the principle of process concentration, and most or all surface processing should be completed as much as possible under one clamping. According to the different structure and shape of parts, the outer circle, end face or inner hole are usually selected for clamping, and the unity of design basis, process reference and programming origin shall be ensured as far as possible. In batch production, the following two methods are commonly used to divide processes.

(1) According to the machining surface of parts. The surface with high position accuracy is arranged under one clamping to avoid the installation error caused by multiple clamping affecting the position accuracy.

(2) According to rough and finish machining. For parts with large blank allowance and high machining accuracy requirements, rough turning and finishing turning should be separated and divided into two or more processes. The rough turning is arranged on the CNC lathe with lower precision and higher power, and the fine turning is arranged on the CNC lathe with higher precision.

The division of machining process of CNC lathe mainly considers the production program, the structure and technical requirements of the equipment and parts themselves. In mass production, if the efficient machining center with multi axes and multi cutters is used, the production can be organized according to the principle of process centralization; if it is processed on the automatic line composed of modular machine tools, the process is generally divided according to the principle of decentralization

Fracture analysis of CNC machining tap

  1. Poor tap quality:

Main materials, CNC tool design, heat treatment, machining accuracy, coating quality and so on. For example, the size difference of tap section transition is too big or the transition fillet is not designed, which leads to stress concentration, which is easy to fracture at the stress concentration. The distance between the transition part of the cross-section at the junction of the handle and the edge is too close to the weld joint, which results in the superposition of the complex welding stress and the stress concentration of the cross-section transition, resulting in a large stress concentration, which leads to the fracture of the tap in use. Wechat of metal processing has good content and deserves attention. For example, improper heat treatment process. During the heat treatment of taps, cracks may occur if the taps are not preheated before quenching, overheated or overheated after quenching, not tempered in time and cleaned too early. To a large extent, this is also an important reason why the overall performance of domestic taps is inferior to that of imported taps.

  1. Improper tap selection:

High quality taps, such as cobalt containing high speed wire taps, cemented carbide taps and coated taps, should be selected for the parts with too high hardness. In addition, different tap designs are used in different work situations. For example, the number, size and angle of the chip removal slot of the tap have an impact on the chip removal performance

  1. The tap does not match with the processed material

In recent years, more and more attention has been paid to this problem. In the past, domestic manufacturers always thought that imported goods were good and expensive ones were suitable. With the increasing of new materials and the difficulty of machining, in order to meet this need, the variety of tool materials is also increasing. This requires that before tapping, select the right tap products.

  1. The diameter of bottom hole is too small

For example, when machining the M5 × 0.5 thread of ferrous metal material, the drill bit with 4.5mm diameter should be used to drill the bottom hole. If the 4.2mm drill bit is used to drill the bottom hole, the cutting part of the tap must be increased during tapping, and the tap will be broken. It is suggested to select the correct bottom hole diameter according to the types of taps and the different materials of the taps. If there is no suitable drill bit, the larger one can be selected.

  1. Material problems of the tapping parts:

The material of the tapping part is not pure, and there are some hard spots or pores in some parts, which causes the tap to lose balance and break instantly.

  1. The machine tool does not meet the accuracy requirements of taps:

Machine tool and clamping body are also very important, especially for high-quality taps, as long as a certain precision of the machine tool and clamping body can play the tap performance. It is common that the concentricity is not enough. At the beginning of tapping, the starting and positioning of the tap is not correct, that is, the spindle axis is not concentric with the center line of the bottom hole, and the torque is too large in the tapping process, which is the main reason for the tap breaking.

  1. Poor quality of cutting fluid and lubricating oil:

Many domestic enterprises have begun to pay attention to this point. Many companies that have purchased foreign cutting tools and machine tools have a very profound experience. The quality of cutting fluid and lubricating oil has problems. The quality of processed products is easy to appear burr and other adverse conditions, and the service life will be greatly reduced.

  1. Unreasonable cutting speed and feed rate:

When machining problems occur, most of the domestic users reduce the cutting speed and feed rate, so that the driving force of the tap is reduced, and the thread accuracy is greatly reduced, which increases the surface roughness of the thread, and the thread diameter and thread accuracy can not be controlled. Of course, burr and other problems are inevitable. However, if the feeding speed is too fast, the torque caused by it is too large, and it is easy to break the tap. The cutting speed of machine tapping is generally 6-15m / min for steel, 5-10m / min for Quenched and tempered steel or hard steel, 2-7m / min for stainless steel and 8-10m / min for cast iron. In the same material, the smaller the tap diameter is, the higher the tap diameter is, the lower the larger tap diameter is.

  1. The operator’s technology and skills did not meet the requirements:

The above problems need operators to make judgment or feedback to technical personnel, but at present, most operators in China do not pay enough attention to them. When the operator is not aware of the tapping speed, for example, when the tap is not forced to enter the hole, or the tap is still not in contact with the bottom of the hole, the tapping speed is not realized. It is suggested that operators should strengthen their sense of responsibility.

Improper CNC process arrangement

Using CNC processing equipment to process, high efficiency, good quality, but if the process design is not properly arranged, it can not reflect its advantages. From the experience of some CNC processing plants, there are some problems as follows:

  1. CNC machining process is too scattered

The reason for this problem lies in the fear of complexity (refers to the preparation time), simple programming, simple operation and processing, easy adjustment of tool setting by using a knife, and being used to ordinary processing. As a result, the product quality (position tolerance) is not easy to guarantee and the production efficiency can not be brought into full play. Therefore, CNC processing personnel and operators should be fully familiar with the knowledge of CNC machining, try more to master the relevant knowledge, as far as possible to use the method of process concentration for processing, more use, will naturally reflect its advantages. After adopting the centralized process, the unit processing time increases. We arrange two equipment face-to-face to realize the operation of two equipment by one person, which greatly improves the efficiency and ensures the quality.

  1. CNC machining sequence is unreasonable

Some CNC processing operators consider some problems in preparation, and often arrange the processing sequence irrationally. NC machining is usually carried out according to the requirements of general machining process planning, such as first coarse and then fine (tool change), first inside and then outside, reasonable selection of cutting parameters, so that the quality and efficiency can be improved.

Be careful to use G00 (g26, G27, g29) fast positioning instructions. G00 instructions bring great convenience to programming and use. However, if it is not set and used properly, it will often lead to over impact when returning to zero due to too large speed setting, the precision will be reduced, and the equipment guide rail surface will be strained. If you don’t pay attention to the return to zero route, it is easy to cause safety accidents of collision between workpiece and equipment. Therefore, when considering the use of G00 instruction, we should consider carefully, not at will.

In the process of NC machining, it is especially important to strengthen the retrieval and trial operation of the program. After the program is input into the control system, the operator should use Sch key and ↑, ↓, ←, → mobile keys for uncertain and definite retrieval, and modify the program if necessary to ensure the accuracy of the program. At the same time, before the formal implementation of the program processing, must go through the program trial run (open power amplifier), to confirm whether the processing route is consistent with the design route.

The above are some common problems and solutions when using CNC processing equipment. There may be some other problems in the actual work, but as long as the CNC processing engineers and operators gather their wisdom and master the relevant knowledge and skills of numerical control, the CNC equipment will be able to play the greatest benefit for the enterprise.

Correct use of cutting fluid in CNC machining

There are two kinds of cutting fluids used in CNC machining: one is oil-based cutting fluid, the other is water-based cutting fluid;

There are four kinds of cutting fluids used in CNC machining: cutting oil, emulsion, semi synthetic fluid and synthetic fluid,

Cutting oil, emulsion (sometimes called soapy water in some places) and synthetic fluid (called environmental protection fluid by many people) are commonly used, but they may know less about semi synthetic night;

How do you choose cutting fluid in the machining process? Let’s look at the advantages and disadvantages of each cutting fluid

  1. Cutting oil for CNC machining:

advantage:

a. Very high physical lubrication

b. Suitable for low speed, less cutting allowance

c. Provides a very good surface finish

Disadvantages:

a. Poor heat transfer

b. Fire hazard

c. High cost of use

d. Smoke / fog

  1. The emulsion used in CNC processing:

advantage:

Better lubrication

a. For polymetallic safety

b. It has better cooling than cutting oil

c. Good erosion ability of scrap iron

d. Lower cost than cutting oil

e. Good rust prevention

f. Easy sewage treatment

Disadvantages:

a. Increased dosage

b. It also emulsifies dirty oil

c. Poor odor control

d. Dirty equipment

e. Poor hydraulic stability

f. Poor filtration

g. Poor mixing

  1. Semi synthetic liquid used in CNC processing:

advantage;

a. Better cooling than emulsion

b. Good rust protection

c. Cleaner than emulsion

d. Good filtration

e. It is more suitable for hard water and dirty oil

f. It is more suitable for hard water and dirty oil

g. It has better antibacterial property than emulsion

Disadvantages:

a. There is a tendency to blister in soft water

b. Oil repellency is worse than synthetic liquid

c. When used in high concentration, may have skin allergy tendency

  1. Synthetic solution for CNC processing:

advantage:

a. Very good cleanliness

b. It doesn’t stink

c. High acceptance of operators

d. Low consumption turnover (12-20 weeks)

e. Very good cooling performance

f. Completely oil repellent

g. Hypovacuole

h. Long service life

i. Very good filtration / fast settling performance

Disadvantages:

a. Low physical lubrication

b. Difficulty in sewage treatment

c. Sticky residue, especially in hard water

d. Compatibility with emulsions

e. It reacts with some polycarbonate

f. May damage the paint of the machine tool

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