1. First, carefully clean the locked area and install the tool on the turret. Then use the indicator to measure the length, as follows
100 mm stroke tool deviation should not exceed 1 mm.
2. Usually, one way to check whether the tool is vertical is to check the generated chips. If the chips produced by the workpiece flow to one side in a long filament shape, it may be that the tool is not installed correctly. Another phenomenon is the early wear of the corner of the cutting blade, which shows that one side of the blade bears more pressure than the other.
3. If the tool performance or the quality of the produced parts changes during machining, please follow the above installation steps. Sometimes slight collision of tools will cause deviation. Therefore, it is a good idea to check the cutting condition of the tool as soon as possible after installation, which is helpful to identify and prevent serious tool failures.
4. Another main consideration when installing a tool is the position of the cutting edge relative to the axis of the workpiece. Incorrect installation of blades will cause a series of problems, among which the most common ones are early wear and sudden failure of tools, poor chip shape, poor side roughness and vibration. These problems will be further aggravated because it is sometimes difficult to find out the actual position of the blade. In the old manual and automatic machine tools, these phenomena are more frequent. Most cemented carbide blades designed by manufacturers need to be installed slightly higher than the central axis of the workpiece. This position is beneficial to the use of welding chip breaker and ensures that the blade is reliably clamped on the tool holder.
5. When the blade is installed slightly above the center, the tangential force can act on a larger blade area. This will increase the strength of the tool and make the blade firmly positioned in the groove. Valve import pump industrial washing machine
6. When the angle between the cutting edge and the workpiece is determined, the cemented carbide cutting insert is usually designed to maximize its strength and robustness. If the blade is higher than the center line, the blade clearance angle will be reduced. The upper half of the flank will rub against the workpiece, so the cutting area will generate a lot of heat. On the other hand, this will lead to the early wear of the blade and the cold work hardening of the workpiece. The most common sign of this situation is excessive side wear of the blade after short-term cutting. Blades below the center line will cause more problems. When the blade is below the center line, the clearance angle will increase. This makes the small tip bear all the cutting force, thus shortening the tool life and increasing the possibility of sudden failure of the tool. Another problem brought by the blades below the center line is the irregular deviation of the blades. Because most of the cutting force acts on the tip, it often vibrates and rebounds. This irregular movement has an impact on the tool life, which is usually manifested as chip breaking in the front of the cutting edge. It will produce vibration marks and poor surface roughness at the bottom and side of the part groove.
7. One of the most serious consequences of using the blade below the centerline is that the blade is pulled out. When the blade contacts the whole rod, the rotation of this part actually pulls the blade out of the groove; The burr left in the center of the part accumulates on the cutting edge, and when the part continues to rotate, the blade will be pulled out of the groove. If this situation is not judged in time, the tool rest will be damaged when machining the next part, and the machine tool and the machined part may be damaged. This means wasting time. Even if the blade is not pulled out of the tool holder, the burr rotating through the top of the cutting edge may cause tool damage.
8. For these reasons, it is necessary to prevent the cutting depth of the tool from exceeding the central part of the workpiece. After the center point, the actual rotation direction is opposite, and the cutting force may pull the blade out of the tool holder. At the same time, this rotation will rub the side of the blade, leading to the early wear of the blade.
In order to overcome the problem of blade pull-out, many tool manufacturers have adopted the method of
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The concept of automatic clamping was put forward in the early 1970s. This method does not need screws and levers to position and clamp the blade, but relies on rotation and tool pressure to position the blade in the wedge-shaped groove. In this way, the cutting depth of the tool can be almost unlimited without a pressing device, and the types of the tool holder and the blade are another factor to keep the tool at a higher position in the center during installation.
The three most commonly used cutter types are cutter body and cutter head system. It comprises a locking cutter body installed in a chuck of a machine tool and a replaceable double-sided cutter head for installing alloy blades, and the cutter head is provided with a self-locking cutter groove.
9. The broken knife is a combination of two kinds of blades and cutterhead, which is locked by a simple wedge. At the top and bottom of the blade, there are inclined planes matching with the cutter head. The blade is wedged and held in the cutter groove by the elastic force generated by the cutter head. In some cases, the blade may be further pressed into the groove, thus changing the position of the cutting edge to be lower than the center height. AG rate cutting, intermittent cutting and worn grooves may all lead to this phenomenon. exist
In the F-type cutter, the blade and cutter head are as follows
Fix the locating slot. A positioning block is welded on the blade, and the positioning block is in contact with the top surface of the supporting knife plate. Once the blade is installed in the pocket, it will remain in a fixed position.
10, the combination of blade and cutterhead should enable the chips to be discharged from the cutting area smoothly. If the chips accumulate and invade the groove before cutting the part, the blade is likely to cut these chips again and will suddenly fail. If the chip rubs the cutter head violently, it will generate a lot of heat, which will also cause fatigue and accelerate the failure. All carbide tool manufacturers provide the center height of their products. Therefore, the manufacturer's recommended values should be strictly observed.
The geometric size of the blade and the type of the tool holder have an influence on the center height. Usually wider than width
0.5mm blade, the following formula is very useful for determining its maximum center height: center height =0.8mm× width+0.025 mm.
1 1. When cutting, remember to install the cutting edge at or slightly above the center height. Operators and installers who use high-speed steel tools or similar tools usually think that these tools work better below the center height. However, for modern cemented carbide blades, it is more difficult to cut when working below the center height.