CNC Machining and CNC Machine Tools

29 CNC machining knowledge! Predecessors are finishing so clear

1. The effect of cutting temperature: cutting speed, feed rate, back to eat knife amount;
The impact on the cutting force: back to eat knife, feed rate, cutting speed;
Impact on tool durability: cutting speed, feed rate, back to eat knife amount.

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2. When the amount of back to eat knife doubled, the cutting force doubled;
When the feed rate is doubled, the cutting force increases by about 70%;
When the cutting speed is doubled, the cutting force is gradually reduced;
In other words, if the use of G99, cutting speed becomes larger, cutting force will not have much change.

3. According to the situation of iron scrap to determine the cutting force, cutting temperature is within the normal range.

4. When the actual value of the amount of X and the diameter of the drawing is greater than 0.8 when the car concave arc, the sub-angle of 52 degrees of the knife (that is, we commonly used blade is 35 degrees of the main angle of 93 degrees of turning ) R out of the car where the starting position may wipe the knife.

5. The color represented by the color of the iron:
White is less than 200 degrees
Yellow 220-240 degrees
Dark blue 290 degrees
Blue 320-350 degrees
Purple black is greater than 500 degrees
Red is greater than 800 degrees

6.FUNAC OI mtc general default G command:
G69: Not very clear
G21: Metric size input
G25: Spindle speed fluctuation detection is off
G80: Fixed cycle canceled
G54: coordinate system default
G18: ZX plane selection
G96 (G97): constant linear speed control
G99: feed per revolution
G40: Tool nose compensation cancel (G41 G42)
G22: Storage stroke detection ON
G67: Macro Program Moderation Call Cancel
G64: Not clear
G13.1: Polar coordinate interpolation mode is canceled

7. External thread is generally 1.3P, the internal thread is 1.08P.

8. Thread speed S1200 / pitch * Safety factor (usually 0.8).

(1-tan (a / 2)) X = R (1-tan (a / 2)) * tan (a) from the bottom of the car chamfer: Z = R * Go down to the car chamfer will be reduced to plus can be.

10. Feed for each increase of 0.05, the speed reduced 50-80 turn This is because the lower speed means that the tool wear and tear decreased, the cutting force to increase the slower, so as to make up for the increase in feed to increase the cutting force, the temperature increases Bring the impact.

11. Cutting speed and cutting force on the impact of the tool is essential, cutting force over the main reason for the collapse of the tool. Cutting speed and cutting force of the relationship: the faster cutting speed when the feed is not changed, the cutting force is slowly reduced, while cutting the faster the tool will make the faster wear, so that cutting force is getting bigger and higher temperature will be more The higher the cutting force and the internal stress to the blade can not bear, it will fall craters (of course, which also has the temperature changes caused by the stress and hardness of the decline and other reasons).

12. In the processing of CNC cars, the following points should pay special attention to:
(1) for the current economic CNC lathes in China is generally used in ordinary three-phase asynchronous motor through the inverter to achieve stepless speed change, if there is no mechanical slowdown, often at low speed when the spindle output torque is insufficient, if the cutting load is too large, easy to boring Car, but some of the machine with a gear on the gear to solve this problem;
(2) as far as possible to make the tool to complete a part or a work shift processing, large pieces of finishing, especially in the middle to avoid midway change tool to ensure that the tool can be processed once completed;
(3) with CNC car turning thread as much as possible through the use of high speed to achieve high quality and efficient production;
(4) use G96 as much as possible;
(5) The basic concept of high-speed machining is to make the feed more than the heat conduction speed, which will cut the heat with the iron discharge to cut the heat and the workpiece isolation to ensure that the workpiece does not raise or heat up, so high-speed processing is selected Cutting speed and high feed match at the same time select a smaller amount of back to eat knife;
(6) Note the compensation of the tip R.

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13. In the car slot often produce vibration and collapse knife, which all the root causes of the cutting force is greater and the tool rigidity is not enough, the shorter the length of the tool, the smaller the rear angle, the greater the area of the blade the better rigidity, The greater the cutting force of the slot knife, Its cutting force is also small.

14. Causes of vibration when the trough is generated:
(1) the tool extension length is too long, the reduction of the rigidity is reduced;
(2) the feed rate is too slow, pour the unit cutting force becomes large and thus cause significant vibration, the formula is: P = F / back knife amount * f P for the unit cutting force F for the cutting force, Will also knife;
(3) machine rigidity is not enough, that is, cutting tools can bear cutting force, and the machine can not bear, that white is the machine car does not move, the general new bed will not appear such problems, the emergence of such problems bed or age, Either often encounter machine tool killer.

15. In the car a cargo, the beginning of the size was found to be good, but after a few hours to find the size of the change and the size of the reasons may be unstable because the beginning of the knife are new, so the cutting force are Not very large, but the car after a period of time after the tool wear, cutting force becomes larger, resulting in the workpiece on the chuck shift, so the size of the old run and unstable.

16. When using G71, the values of P and Q can not exceed the sequence number of the entire program. Otherwise, the alarm will appear: G71-G73 is not formatted correctly, at least in FUANC.

17. The subroutine in the FANUC system has two formats:
(1) P000 0000 the first three refers to the number of cycles, the last four for the program number;
(2) P0000L000 the first four for the program number, L after the three for the number of cycles.

18. The arc starting point does not change, the end point Z direction offset a mm, the arc diameter position offset a / 2.

19. In the deep hole when the drill bit is not grinding cutting groove to facilitate the drill bit chip.

20. If it is used to do the tooling with a knife, you can turn the drill, you can change the aperture of the shot.

21. In the center of stainless steel center, or hit the stainless steel eye when the drill bit or the center of the drill center must be small, or not fixed, in the use of cobalt drilling when drilling is not grinding groove in order to avoid drilling during the drill bit annealing.

22. According to the process of cutting materials generally divided into three kinds: a material about, two goods about the whole bar about.

23. In the car when the oval may appear when the material is loose, with a tooth knife more than a few knives on the line.

24. In some of the system can enter the macro program can be used to replace the subroutine macro cycle, so you can save the program number, you can avoid a lot of trouble.

25. If you drill with a drill bit, but the hole is very high, then you can use the flat bottom drill to reamer, but twist drill must be short to increase the steel.

26. If you drill directly with a drill bit, the aperture can be biased, but if the drill hole in the hole size generally do not run, such as with 10MM drill bit in the drilling machine for reaming, then the expansion of the aperture are generally In the 3 wire tolerance around.

27. in the car hole (through the hole) as much as possible when the continuous scraping of scraps and then from the tail discharge, crumbs points: First, the knife position to properly higher, two, the appropriate blade angle, As well as the amount of feed, remember that the knife can not be too low or easy to break the chip, if the knife side of the large angle, then even if the chip will not card knife, if the sub-angle is too small, the chip will clip the knife Rods are prone to danger.

28. Arbor in the hole in the larger cross-section is not easy to vibration knife, there can be tied on the pole can be a strong rubber band, because the strong rubber band can play a role in the adsorption of vibration.

29. In the car copper hole, the knife tip R can be appropriate large (R0.4-R0.8), especially in the car under the taper, iron pieces may be nothing, the copper pieces will be card dust.

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