Everyone has a deep understanding of the benefits of using CNC machining centers to process workpieces. There is still a veil of mystery about the operation and programming of CNC machining centers. Today Chenghui Xiaobian will share with you the thread processing method. There are three methods of CNC machining: thread milling method, tap processing, and buckle processing method:
1. Thread milling method
Thread milling is the use of thread milling tools for the processing of large-hole threads, as well as the processing of threaded holes of relatively difficult-to-machine materials. It has the following characteristics:
1. The cutting tool is generally made of hard alloy material, with fast speed, high precision of thread milling and high processing efficiency;
2. The same pitch, whether it is a left-handed thread or a right-handed thread, can use a tool to reduce the cost of the tool;
3. The thread milling method is especially suitable for thread processing of difficult-to-machine materials such as stainless steel and copper. It is easy to remove chips and cool, and can ensure the quality and safety of processing;
4. Without the guidance of the front end of the tool, it is more convenient to process blind holes with short threaded bottom holes or holes without tool relief. the
Thread milling tools are divided into machine clip type carbide insert milling cutter and integral carbide milling cutter. Holes; while solid carbide milling cutters are used to process holes whose thread depth is less than the length of the tool;
Attention points for thread milling NC programming: so as not to cause damage to the tool or processing errors. the
1. After the threaded bottom hole is processed first, use a drill to process a small diameter hole, and use boring to process a larger hole to ensure the accuracy of the threaded bottom hole;
2. The tool generally uses a 1/2 circle arc track to cut in and out to ensure the thread shape, and the tool radius compensation value should be brought in at this time. the
Second, CNC machining center tap processing method
It is suitable for threaded holes with small diameter or low requirement for hole position accuracy. In general, the diameter of the threaded bottom hole drill is selected close to the upper limit of the diameter tolerance of the threaded bottom hole, which can reduce the machining allowance of the tap and reduce the load of the tap. The service life of the tap is improved. the
Everyone should choose the appropriate tap according to the material to be processed. The tap is compared to the milling cutter and boring cutter;
It is very sensitive to the processed material; taps are divided into through-hole taps and blind-hole taps. The front-end guide of through-hole taps is long for front chip removal. When processing blind holes, the processing depth of threads cannot be guaranteed, while the front-end guide of blind holes is short. , for rear chip removal, so pay attention to the difference between the two; when using a flexible tapping chuck, pay attention to the diameter of the shank of the tap and the width of the square should be the same as that of the tapping chuck; the diameter of the shank of the tap for rigid tapping should be the same as that of the spring The jacket diameters are the same. the
The programming of the tap processing method is relatively simple. They are all fixed modes, and it is enough to add parameter values. It should be noted that the format of the subroutine is different for different CNC systems, and the representative meanings of the parameter values are different. the
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Three, pick button processing method
The buckle processing method is suitable for processing large threaded holes on box-type parts, or when there is no tap and thread milling cutter, this method is used to install a thread turning tool on the boring bar for boring threads. There are several points for attention in the implementation of the buckle processing method:
1. There must be a delay time to start the spindle to ensure that the spindle reaches the rated speed;
2. The sharpening of the hand-grinding thread tool cannot be symmetrical, and the tool cannot be reversed and retracted. It is necessary to use the spindle to orient the tool to move radially, and then retract the tool;
3. The knife rod must be accurate and consistent with the position of the knife groove, otherwise it cannot be processed with multiple knife rods, resulting in chaotic buckling;
4. When picking the buckle, be careful not to pick it with one knife, even if it is a very thin buckle, otherwise it will cause tooth loss and poor surface roughness. You should use multiple knives to pick the buckle;
5. The pick button processing method is only suitable for single piece, small batch, special pitch thread and no corresponding tool, and the processing efficiency is low. the
The buckle processing method of the CNC machining center is only a temporary emergency method. It is recommended that everyone use the thread processing method to process the tool, so as to effectively improve the efficiency and quality of thread processing, reduce the processing cost and improve the efficiency of the machining center.
Post time: Aug-24-2023
