Key Chip Control in Drilling When the chip shape is not appropriate, the following problems will arise: ① Fine chips block the cutting edge groove, affecting the drilling accuracy, reducing the life of the drill bit, and even breaking the drill bit (such as powdery chips, fan-shaped chips,dth drill bits, etc.); ② Long chips entangle the drill bit, which hinders the operation, causing the drill bit to break or preventing the cutting fluid from entering the hole (such as spiral chips, ribbon chips, etc.). How to solve the problem of improper chip shape: ① The chip breaking and chip removal effects can be improved by increasing the feed rate, intermittent feed, grinding the chisel edge, installing the chip breaker and other methods respectively or in combination, so as to eliminate the problems caused by chips. ② Professional chip-breaking drill can be used for drilling. For example, the addition of a designed chip breaker in the groove of the drill breaks the chips into more easily removed chips. The debris is smoothly discharged along the groove, and the phenomenon of blockage in the groove does not occur. Therefore, the new chip-breaking drill obtains a much smoother cutting effect than the traditional drill. At the same time, the short scrap iron makes the coolant flow to the drill tip more easily,Tapered Rock Bit, which further improves the heat dissipation effect and cutting performance in the processing process. Moreover, because the new chip-breaking edge penetrates the whole groove of the drill bit, it can still maintain its shape and function after many times of grinding. In addition to the above functional improvements, it is worth mentioning that the design strengthens the rigidity of the drill body and significantly increases the number of holes drilled before a single grinding. III. Drilling accuracy The accuracy of the hole is mainly composed of the hole size, position accuracy, coaxiality, roundness, surface roughness and hole burr. Factors affecting the accuracy of the hole to be machined during drilling: Expand the full text ① Bit clamping accuracy and cutting conditions, such as tool holder, cutting speed, feed rate, cutting fluid, etc.; ② Drill size and shape, such as drill length, blade shape, drill core shape, etc.; ③ Workpiece shape, such as orifice side shape, orifice shape, thickness, clamping state, etc. Reaming Reaming is caused by the oscillation of the drill during machining. The swing of the tool holder has a great influence on the hole diameter and the positioning accuracy of the hole, so when the tool holder is worn seriously, it should be replaced with a new one in time. When drilling a small hole, dhd drill bit ,dth drilling hammer, it is difficult to measure and adjust the swing, so it is better to use a drill with a thick shank and a small edge diameter with a good coaxiality between the blade and the shank.1. Cutting edge Wear loss of chisel edge and edge land; 2. Dimensional accuracy and surface roughness of the hole to be machined ； 3. The color of the swarf , shape; 4. Cutting resistance (Indirect values of spindle current, noise, vibration, etc.); 5. Processing quantity, etc 。 In actual use, accurate and convenient criteria should be determined from the above indicators according to the specific situation. When the wear loss is used as the criterion, the best regrinding period with the best economy should be found out. Because the main grinding parts are the back of the head and the chisel edge, if the wear of the drill bit is too large, the grinding time is too long, the grinding amount is too large, and the number of times of regrinding is reduced (the total service life of the tool = the service life of the tool after regrinding × the number of times of regrinding), which will shorten the total service life; When the dimensional accuracy of the hole to be machined is used as the criterion, the column gauge or limit gauge shall be used to check the cutting expansion and non-straightness of the hole. Once the control value is exceeded, it shall be re-sharpened immediately. When the cutting resistance is used as the criterion, it can be stopped automatically immediately when the set limit value (such as spindle current) is exceeded; When the limit management of processing quantity is adopted, the above discrimination contents shall be integrated and the discrimination criteria shall be set. Method for sharpening drill bit When re-sharpening the drill, it is better to use a special machine tool for drill sharpening or a universal tool grinder, which is very important to ensure the service life and machining accuracy of the drill. If the original drill type is in good processing condition, it can be reground according to the original drill type; if the original drill is defective,fastest dth hammer, the rear shape can be properly improved and the chisel edge can be grinded according to the use purpose. Attention shall be paid to the following points during sharpening: 1. Prevent overheating ? Avoid reducing the hardness of the drill bit; 2. Damages on the drill bit shall be (Especially the damage on the edge surface of the blade) is completely removed; 3. The drill pattern shall be symmetrical ； 4. Be careful not to damage the cutting edge during sharpening. , and remove the burrs after sharpening; 5. For cemented carbide drill bits ? The sharpening shape has a great influence on the performance of the drill. The drill shape when leaving the factory is the best drill shape obtained through scientific design and repeated tests. Therefore, the original edge shape should be maintained when re-sharpening. This article is from Momo's WeChat public account [UG NC Programming]. You can get the tutorial after paying attention to it. Return to Sohu to see more Responsible Editor:. wt-dthtools.com