This new carbide machine clamp has an adjustable additional coil cutter that allows the chips to be rolled up in a spiral shape. In Fig. 1, the additional chip remover 4 is at the same time the holder of the blade 6, which secures the blade in the tool holder 1. When cutting, the chip hits the working part of the coiler and rolls up. This part is welded with a carbide piece with a thickness of 3 to 5 mm. The front end of the additional chip breaker presses the carbide insert and the rear end presses the retaining iron 3. The lower portion of the armature 3 and the upper portion of the backing plate 2 have serrations, and after the blade is worn, the structure can extend the blade. The backing plate is made of alloy and hardened tool steel to protect the carbide insert from damage. The new type of machine clamping knife adopts a rectangular blade. When the knife is sharpened, the blade is clamped in a special cutter bar, and the angle of the ground tool is checked by the template. The sharpening angle of the cemented carbide insert is: rake angle g=10°, back angle a=8°, main angle kr=55° or 45°, and declination kr1°=15°. In order to make the tool holder reusable, it is forged from 45# steel and has a heat treatment hardness of 45 to 48. The heavy-duty turning experience with this turning tool shows that the chip is spiraled into a spiral shape at high speed cutting (the cutting section is large), and the chips are broken near the cutting edge. If the heavy-duty lathe runs smoothly, the cutting edge of the cemented carbide insert will not be broken, and the production efficiency will be greatly improved. After comparison, the turning tool has the same service life as the turning tool welded with the solid carbide insert. However, compared to other types of carbide turning tools in production, in most cases, this type of heavy-duty turning tool is more durable and has a larger profile for cutting chips. Experience has shown that under any conditions, the chip rolling conditions are good, and the chips are rolled out in a long spiral or a short spiral. When the ratio of the cutting depth to the infeed amount is not more than 3 to 4, the chips will fall into the fine pieces after they hit the arbor. This new type of carbide machine clamp with a chip conveyor is used for cutting steel on lathes and vertical lathes. For turning tools with a profile of 40 mm × 60 mm and 40 mm × 40 mm, the maximum chip profile is 20 mm 2 on a blade with a width of 30 mm and 15 mm 2 on a blade with a width of 25 mm if the cutting allowance is uniform. When the cutting allowance is uneven, the chip profile should be reduced by 30% to 40%. When the impact of the machining process is large, it is not suitable to use the heavy-duty turning tool of this structure. Care should be taken when sharpening such cemented carbide inserts by placing the carbide insert in the shank groove and securing it with the bolts and the pad of the scum. The length of the blade from the inside of the holder should not exceed 1 to 1.5 mm. The pad should be placed in front of the blade, and the chip should be spirally wound out when placed. The distance or amount of protrusion measured from the middle of the blade depends on the size of the chip profile. The size of the amount of protrusion should not be less than the value listed in Table 1, otherwise the chip will hit the chipper violently, which will cause the cutting part of the turning tool to break and even break the tool bar. When cutting, replace the blunt or broken blade in time. The blade must be cleaned from the shank by replacing the blade. The advantage of this type of cutter structure is that when there is an error between the cutter block and the cutter body, the grinding can be performed to ensure the assembly precision; the compression bolt is located on the flank face and is not easily damaged by the chip. The plate holder is more suitable for heavy-duty cutting because it greatly increases the rigidity of the blade in the direction of force. After increasing the amount of cutting, it does not cause large vibration, which is beneficial to the improvement of production efficiency and processing quality. The cutting depth of the heavy turning roughing stage can reach 50mm on one side, the corresponding cutting speed is about 10m/min, and the feed rate is 1.5mm/r. Since the roughing stage is to remove the allowance as the main processing purpose, in accordance with the principle of determining the cutting allowance in machining, in order to improve the cutting efficiency, the cutting depth should be increased. Due to the large cutting depth during heavy cutting, the cutting force is large, and the corresponding cutting speed is generally selected to be 10 to 15 m/min, and the feed amount is 1 to 2 mm/r. With such a cutting amount, the surface roughness of the workpiece is relatively poor, and only Ra12.5 to Ra6.3 can be achieved, and the roughness value can be increased by the rolling method to meet the requirements of the subsequent processing. 5, the conclusion Compared with ordinary turning, heavy-duty turning differs greatly from theoretical calculations. At present, many processes and tool materials for heavy-duty turning are based on ordinary machining. This is not entirely applicable, so it needs to be further explored. Previous page Check Valves,Dual Plates Wafer Check Valve,Dual Plate Non-Return Valve,Water Butterfly Check Valve ZHITONG PIPE VALVE TECHNOLOGY CO.,LTD , https://www.ztongvalve.com
4 choice of cutting amount