Everyone has deeply understood the benefits of using 3D Milling Machine Cnc V850, and there is still a layer of mystery regarding the operation and programming of CNC machining centers. Share the thread processing method with you. There are three methods for CNC machining: thread milling, tap machining, and picking machining:
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 difficult-to-machine materials. It has the following characteristics:
1. The tool is generally made of hard alloy material, which has high speed, high precision of milling thread and high processing efficiency;
2. With the same pitch, one tool can be used whether it is a left-handed thread or a right-handed thread, which reduces the cost of the tool;
3. The thread milling method is especially suitable for thread processing of stainless steel, copper and other difficult-to-process materials, which is easy to remove chips and cool, and can ensure the quality and safety of processing;
4. There is no tool front guide, it is more convenient to process blind holes with short threaded bottom holes or holes without undercuts.
Thread milling tools are divided into two types: machine-clamped cemented carbide blade milling cutters and integral cemented carbide milling cutters. Machine-clamped tools can process holes with a thread depth less than the length of the blade, and can also process holes with a thread depth greater than the length of the blade. Hole; and the integral carbide milling cutter is used to process holes whose thread depth is less than the length of the tool;
Note for thread milling CNC programming: so as not to cause damage to the tool or processing errors.
1. After processing the threaded bottom hole, use a drill to machine a small diameter hole, and use boring to machine a larger hole to ensure the accuracy of the threaded bottom hole;
2. The tool generally uses a 1/2 circle arc path to cut in and out to ensure the thread shape, and the tool radius compensation value should be brought in at this time.
2. Tap processing method of CNC machining center
Suitable for threaded holes with small diameters or low hole position accuracy requirements. Generally, the diameter of the threaded bottom hole drill is close to the upper limit of the threaded bottom hole diameter tolerance, which can reduce the machining allowance of the tap and reduce the load of the tap. Improve the service life of the tap.
Everyone should choose the appropriate tap according to the material to be processed. The tap is relative to the milling cutter and boring cutter;
Very sensitive to the material to be processed; taps are divided into through-hole taps and blind-hole taps. The leading end of the through-hole tap is long, which is the front chip removal. When processing blind holes, the processing depth of the thread cannot be guaranteed, and the leading end of the blind hole is shorter. , Is the rear chip removal, so pay attention to the difference between the two; when using flexible tapping chucks, pay attention to the diameter of the tap shank and the width of the square should be the same as that of the tapping chuck; for rigid tapping, the shank diameter of the tap should be the same as that of the spring The jacket diameter is the same.
The programming of tap processing method is relatively simple, all are in fixed mode, just add parameter value, it should be noted that the format of the subroutine is different for different CNC systems, and the representative meaning of the parameter value is different.
Three, pick and button processing method
The picking method is suitable for the processing of large threaded holes on box 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 to perform thread boring. There are several precautions for implementing the pick-and-loop processing method:
1. There must be a delay time for starting the spindle to ensure that the spindle reaches the rated speed;
2. The sharpening of hand-grinding thread tools cannot be symmetrical, and the reverse retraction cannot be used. The spindle should be used to orient the cutter to move radially, and then retreat;
3. The tool holder must be precise and consistent with the position of the tool slot, otherwise multiple tool holders cannot be used for processing, which will cause random snapping;
4. When picking the buckle, be careful not to pick it with one knife, even a very thin buckle, otherwise it will cause tooth loss and poor surface roughness, so you should divide it into multiple knives for picking;
5. The buckle processing method is only suitable for single pieces, small batches, special pitch threads and no corresponding tools, and the processing efficiency is low.
The buckle machining method of the CNC machining center is only a temporary emergency method. It is recommended that you use the thread machining method to process the tool to effectively improve the efficiency and quality of thread machining, reduce the processing cost and improve the efficiency of the machining center.
