- Before work, you must wear the specified labor protection articles, and drinking is strictly prohibited; In the work, we should concentrate, operate carefully and strictly abide by the safety operation regulations.
- Before starting the machine tool, read the operation manual of the machine tool in detail. Do not move the machine tool at will until you are familiar with the operation of the machine tool. For your safety, please read the operation manual of the machine tool carefully before starting the machine tool, and pay attention to the following matters:
(1) Shift handover record before working every day, the operator shall first look at the shift handover record, then check whether there is any abnormality, observe whether the oil in the automatic lubricating oil tank of the machine tool is sufficient, and then manually add oil for several times.
(2) Power supply: 1) when connecting the power supply, first connect the main power supply of the machine tool, and then connect the CNC power supply; However, when cutting off the power supply, operate in the reverse order. 2) In case of power failure, the main power supply shall be cut off immediately. 3) Before power transmission and pressing the button, pay attention to observe whether someone is repairing the machine tool or electrical equipment around the machine tool to prevent accidental injury to others. 4) After the work, the main power supply shall be cut off.
(3) Check 1) before the Boom-Bucket machine tool is put into operation check whether all control functions are normal according to the operation steps described in the operation manual. If there is any problem, eliminate it before working. 2) Check whether the pressure values indicated by all pressure gauges are normal.
(4) Emergency stop: in case of emergency, press the stop button immediately.
- General safety operating procedures for CNC GRINDING SERVICEand turning centers (1) before operating the machine tool, be sure to wear labor protection articles and do not wear gloves to operate the machine tool. (2) Before operation, you must be familiar with the function of each button and the precautions for operation. (3) Pay attention to the warning signs on each part of the machine tool. (4) The tools around the machine tool shall be placed neatly and easy to handle. (5) The protective door of the machine tool must be closed before processing. (6) After the tool is clamped, the trial cutting shall be carried out manually. (7) During the operation of the machine tool, do not remove the chips and avoid touching the moving parts of the machine tool by hand. (8) When removing chips, use certain tools and be careful not to be scratched by chips. (9) To measure the workpiece, it must be carried out when the machine tool is stopped. (10) After work, pay attention to keep the machine tool and control equipment clean and maintain the machine tool in time.
- Special precautions during operation: (1) when the machine tool is powered on, the operator must not open and contact the parts with lightning symbols and strong current devices on the machine tool to prevent being injured by electricity. (2) When maintaining the electrical device, the power supply must be cut off first. (3) During the operation of the machine tool spindle, be sure to close the protective door of the machine tool, and pay attention to the safety of your hands when closing the door to avoid injury. (4) Don’t turn on the bed during thunder. Because the instantaneous high voltage and large current during lightning strike are easy to impact the machine tool, resulting in burning out the module or loss of change data, resulting in unnecessary losses, the following points should be achieved: 1) do not start the machine tool during lightning strike; 2) Lightning protection network shall be erected on the roof of NC workshop; 3) Each CNC machine tool shall be well grounded and the grounding resistance shall be less than 4 Ω. (5) It is forbidden to make trouble, chat, sleep and leave the post arbitrarily. At the same time, pay attention to concentration and put an end to alcoholism and fatigue operation.
- Civilized production shall be achieved. After the processing operation is completed, the work site must be cleaned, the machine tool must be wiped clean, and the power supply of the system must be cut off before leaving.
How to standardize the operation of CNC milling machine
It’s important to reset to zero the first thing when starting up. Then practice slowly according to the process operation! Look at the operating instructions and understand the performance of the machine tool
What do you need to pay attention to when making a grinder
When operating the grinder, first check whether the grinding wheel is broken. Pay attention to whether the grinding wheel is firmly installed, whether the dynamic balance is well done, whether the magnet is firmly absorbed, and check a series of safety problems. Then check whether the grinding wheel has been corrected and process it after confirmation.
Correct methods and skills of grinding NC cutting tools
General rule of knife sharpening:
- No matter what kind of knife or tool you use (Lansky, spyder., grindstone… Whatever), the first element of knife grinding is to maintain the fixed edge angle of the blade during grinding, which requires practice, but an old hand knows the trick is to use a strange pen to blacken the cutting edge area of the knife before grinding, and then take it for light grinding for a few times, and then check the edge area. If the angle is correct, Black will be completely worn off, if not, after observing the Mark area after adjusting the angle, after catching the angle will feel, remember, follow this feeling grinding knife. This method is applicable to both new and old hands, because different knives have different angles. Even a professional knife grinder may have to adjust the feeling according to different knife angles.
Speaking of this, there is a myth. You can think about whether each knife should maintain the original cutting edge when leaving the factory? No doubt, from this point of view. But from the user’s point of view, I think it’s debatable. I usually change the blade angle according to my habit of using the knife, so that the knife can be used to the greatest extent in my hand, but the premise is “even if you want to change the blade angle, you still have to keep the fixed changed blade angle”.
- When you can fix the edge angle when grinding the knife, you begin to enter the most critical procedure: the degree of grinding. Knife grinding is a process of thinning and grinding the blade material to make a new edge, so the function of the grinding stone is based on this. Rough grinding is to carry out the above process to make a edge. Fine grinding is to remove the burrs produced in the process of rough grinding, and light is to further strengthen the function of fine grinding. It can be seen that the key to good knife grinding is the rough grinding procedure. If you can’t grind well all the time, you must start from here and strengthen it again.
Generally, if there is no missing angle of the blade and the blade angle needs to be trimmed or thinned, we usually rough grind it from a 600 grid grindstone and grind it according to the essentials of 1. To what extent? Key point: grind until the blade is on the other side and all the edges of the blade have burrs (or Flash). Burring represents that you really thin the blade to create a new sharp area, because your grinding surface has reached the edge. At this time, turn over the knife surface and grind it again according to the same method until the other edge is again? {bump burr (some masters only grind one side and remove the burr to complete the sharpening procedure (the same is true for chisel grind’s knife), and then grind it from the other side next time)
- If you are sure of step 2, you have completed 80% of the work of sharpening the knife (at this time, it feels very sharp to touch the blade vertically with your hand), and the rest is the work of deburring.
The rough edge can be removed with a 1000 or 1200 grit grindstone. According to the above, take the lead. Gently grind the edge with rough edge with medium force (compared with part step 2) for about ten times, and then check the edge surface. It should have another rough edge on the other side of the edge, but this rough edge is much smaller than that produced by part step 2. Turn over the same way, grind it ten times and then turn it over. Next, use a small force (almost the weight of the knife itself), slightly raise the angle of the blade (within about 5 degrees), gently grind it three or four times, turn over the blade, and then grind it three or four times according to the same way. Ok, you get it. A sharp blade to remove rough edges.
The above process is only a general rule. Individuals can add or subtract according to their habits, knife types and steel materials, but the procedure is probably like this. If you still have bad grinding (unlikely), start from step 2, and do the next step after the burr is done.
- The next step is the process of light. Light is to use leather (or cloth wheel… Etc.) and abrasive particles to turn the blade into a mirror (I don’t think it has a great impact on the sharpness), but its essentials are different from the above-mentioned essentials of sharpening. It is implemented by slightly increasing the edge angle by moving the blade back forward (because light also has the effect of removing micro burrs). It should be noted that not all knives need light. Generally, it is better to keep some sawtooth shape of the blade in the way of pulling and cutting rope and paper, while the blade used in the way of pushing out, such as peeling apple skin and shaving, has a first-class effect after light. Please make your own decisions as needed. (Note: Tuozhi Jiuqing once proposed in “the wonderful use of survival knife”: the single bevel knife cuts while the double bevel knife cuts. It is similar to the above principles, because usually the knife to be polished has a small blade angle and is cut by pushing or pressing force (such as peeling).
After the above processes, I believe that even novices should be able to grind very sharp knives. The difference is that in step 2, the veteran should be able to maintain the blade angle and complete it in less time. But as long as we have perseverance and patience and do step 2 well, we will be able to grind a beautiful and sharp knife. According to my personal experience, the knife that removes the rough edge after grinding but before polishing can easily shave off leg hair, sweat hair and cut off A4 paper or hanging hair, but I don’t know about shaving, because my knife is not used for shaving, and it’s easy to shave hands and legs, but it’s absolutely not dry to shave your face with a knife in the face of the mirror (except for the safety razor), so as not to lose face in case of a mistake.
- Finally, I would like to discuss the maintenance of blade sharpness. Joe Talmadge in knifecenter put forward in the sharpening FAQs article: due to the progress of steel and heat treatment technology for knives, the blade will not wear quickly after a period of time, but the blade end will bend to the left or right due to the force application method of the user, At this time, the user may feel that it is not as sharp as it has just been polished. At this time, the sharpness of the blade does not need to be reground. Just take an iron sharpening stick (the one commonly used by pork vendors) and brush the left and right sides of the blade several times. Since the hardness of grinding iron is not very different from that of knife steel, the process of this brush is only to restore the edge to the normal angle (re alignment), rather than grinding the material of the knife body in the above-mentioned grinding process. Therefore, special attention should be paid to the iron sharpening rod. Ceramic or diamond sharpening rods are not allowed (these two kinds of sharpening rods are real sharpening rather than rearranging the edge angle). It doesn’t matter whether there are many or no grooves on the iron sharpening rod.
The method of brushing is to use the left hand latte grinding rod to brush the blade at an angle of about 20 degrees from near the handle to the tip of the blade. When brushing, the force is very small, almost using the weight of the blade itself. After each brush, change the side and brush again. In this way, five to ten cycles should guide the blade angle of the blade and the blade can be as sharp as new. When brushing, the blade can be forward or the back can be forward, depending on personal habits.
Joe suggests that this steeling step should be carried out frequently for soft kitchen knives or hard knives such as ats34. In addition to keeping the knife sharp, it can also reduce the service life of the knife because it does not need to be sharpened often. However, if steeling cannot restore the sharpness of the knife, it means that the knife edge is really blunt. The knife can be restored to sharpness only by grinding the knife according to the above steps 1 to 4.
The above steeling’s theory has been verified by practice, and I agree with it very much and it is also very effective. However, it should be noted that steeling is certainly a good way to maintain the blade, but using cloth wheel and abrasive light is also another good method. It does not have the effect of rough grinding, but it can guide the blade angle and obtain the blade of mirror. The disadvantage is that it is much more troublesome than steeling, and everyone can choose to use it according to their preferences. In short, don’t use sharpening for edge maintenance, which will shorten the service life of your knife (especially the high-priced folding knife such as sebenza) and finally turn into toothpick shape. Moreover, the area of the cutting edge angle becomes larger and more difficult to grind.
6. Summary:
Some of the above articles are paraphrased from Joe Talmadge’s article in the sharpening FAQs in knifecenter, plus the simple general rules sorted out by my younger brother after collecting all kinds of knife sharpening information in the past. The detailed process may require you to explore and establish your own set of unique knife techniques. But what’s interesting is that these theories are also the common points I mentioned when discussing with some knife makers in the past. Therefore, if the eastern and Western cultures think that they are useful, I believe they should also be useful to you. Briefly describe the skill of sharpening a knife with a few phrases. I hope it will be helpful to you: “making burr, removing burr and polishing”. Ok, there you go..
In addition, I forgot to tell you that if you are a novice, in addition to the key points in the above article, please pay special attention to the step of reducing strength in the process of fine grinding and polishing. For me, this step is taken for granted due to the previous training of grinding metallography, but it may also be a key procedure for unfamiliar people. In short, the more grinding strength, the lighter it should be, Gradually make the burr smaller and disappear (if the force reduction action is skilled and feeling comes out, everything can be done even when grinding a medium rough knife). If you just want to grind a knife for ordinary daily life (without razor sharp), you can increase the blade angle in the last few strokes of fine grinding. If you want to shave, don’t change the edge angle. The force is lighter and lighter until you use the last few stroping of leather light to increase the edge angle, which will have an amazing effect. CNC is not a tool holder? There is no grinding. No matter how high an expert is, it is impossible to grind a knife for three days, unless it is rarely used.
