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Three methods of machining threads in CNC machining centers

Everyone has an in-depth understanding of the benefits of using CNC machining centers to process workpieces. There is still a layer of mystery about the operation and programming of CNC machining centers.Today I will share with you the thread processing method.There are three methods of CNC machining: thread milling method, tap machining, and buckle machining 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 more difficult-to-process materials, which have the following characteristics:

1.The tool is generally made of cemented carbide material, with fast speed, high thread milling accuracy 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.Thread milling method is particularly suitable for thread processing of more difficult materials such as stainless steel and copper. It is easy to remove chips and cool down, and can ensure the quality and safety of processing.;

4.There is no guide at the front end of the tool, which is more convenient to process blind holes with short threaded bottom holes or holes without tool retreat grooves.

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 thread depth less than the length of the blade, as well as holes with thread depth greater than the length of the blade; and integral cemented carbide milling cutters are used to process holes with thread depth less than the length of the tool.;

Precautions for thread milling CNC programming: So as not to cause tool damage or machining errors.

1.After the threaded bottom hole is processed first, the small diameter hole is processed with a drill bit, and the larger hole is processed with boring to ensure the accuracy of the threaded bottom hole.;

2.The tool generally adopts an arc trajectory of 1/2 circle to cut in and out to ensure the shape of the thread. The tool radius compensation value should be brought in at this time.

2. The tap processing method of CNC machining centers is suitable for threaded holes with small diameters or low hole position accuracy requirements. Under normal circumstances, the diameter of the threaded bottom hole drill bit is selected close to the upper limit of the diameter tolerance of the threaded bottom hole, which can reduce the processing margin of the tap, reduce the load on the tap, and at the same time improve the service life of the tap.

Everyone should choose the appropriate tap according to the material being processed. The tap is relative to the milling cutter and boring cutter.;

It is very sensitive to the material to be processed; taps are divided into through-hole taps and blind-hole taps. The front end of the through-hole tap is guided long, which is the front chip removal. The processing depth of the thread cannot be guaranteed when processing the blind hole, and the front end of the blind hole is guided short, which is the rear chip removal, so pay attention to the difference between the two; the use of flexible tapping chucks should pay attention to the diameter of the tap shank and the width of the square should be the same as the tapping chuck; the diameter of the tap shank for rigid tapping should be the same as the diameter of the spring jacket.

The programming of the tap processing method is relatively simple. It is all in a fixed mode. Just add the parameter values. It should be noted that the CNC system is different and the format of the subroutine is different, so the representative meaning of the parameter values is different.

Third, the buckle processing method

The buckle processing method is suitable for the processing of large threaded holes on box parts, or this method is used without taps and thread milling cutters, and thread turning tools are installed on the boring tool bar for boring threads.There are the following precautions for 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 hand-ground threaded tools cannot be symmetrical, and reverse tool retreat cannot be used. The spindle must be used to orient the tool 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, resulting in random buckles.;

4.When picking the buckle, be careful not to pick it with one knife, even if it is a very fine buckle, otherwise it will cause tooth loss and poor surface roughness. Multiple knives should be used to pick the buckle.;

5.The buckle processing method is only applicable to single-piece, small batches, special pitch threads and situations where there is no corresponding tool, and the processing efficiency is low.

The buckle processing method of CNC machining centers is only a temporary emergency method. It is recommended that everyone process tools by thread processing methods in order to effectively improve the thread processing efficiency and quality, reduce processing costs and improve the efficiency of machining centers. Efficiency.

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