What is the difference between rigid tapping and flexible tapping?

Rigid tapping means that the shank of tapping is rigid and has no automatic adjustment clearance, while flexible tapping means that the shank of tapping is flexible and has adjustment clearance.

In the case of CNC machines: Flexible tapping means without encoders.

C-axis encoder) is: the pitch is controlled by the through-encoded calculation.

Tapping such as G81, Cycle840 column: Cycle840.

Rigid tapping means that the feed of the tap is fixed (rigid) when tapping, and the feed of the tap is adjusted when tapping is flexible, which is generally achieved by the elastic shrinkage function of the spring extension axis.

Tapping is to use a certain torque to screw the tap into the bottom hole to be drilled to process the internal thread.

Turn left|Turn right.

From the tapping process, it can be seen that it is somewhat similar to the screwing in the thread fit, that is, there is a process of rotation and screwing between the tap and the workpiece. In this process, there is a fixed relationship between mutual rotation and feeding.

If the fixed relationship between the mutual rotation and the feed is determined by the machinery when tapping in machinery (such as a lathe), it is called rigid tapping. There is a certain gap between the mutual rotation and feed given by the machinery during rigid tapping, and the thread of the tap, so the rigid tapping cannot be perfect;

If an elastic shrinkage link is added between the mutual rotation and feed given by the machine when tapping a machine (such as a lathe), it is flexible tapping. The difference between the mutual rotation and feed given by the machine during tapping and the thread of the tap can be eliminated by the elastic shrinkage link. This improves the quality of tapping.

Rigidity means that the shank of tapping is rigid and does not automatically adjust the clearance, while the flexible one has an adjustment clearance, and the general one has the elastic shrinkage function of the spring extension axis. Flexible tapping, also known as floating tapping, is that the spindle speed is not strictly synchronized proportional to the feed. Rigid tapping is the opposite.

For CNC machines, flexible tapping refers to tapping without encoder (C-axis encoder): tapping with a thread length control through knitting calculation, such as G81 CYCLE840; Rigid tapping refers to tapping with encoder (C-axis encoder) is: C-axis takes one pitch per revolution.

Fix the instruction CYCL84 G331 with it.

The difference between tapping and threading lies in the object of their action and the way they are used.

Tapping is the process of cutting threads in existing holes. It uses a tapping cutter to rotate and advance to cut threads inside the hole that match the screws or nuts. Tapping is usually applied to metal materials such as steel, aluminum, etc.

It can add threads to existing holes, allowing it to be connected with external threads.

Threading, on the other hand, is a tool for cutting threads, usually used for machining external threads. A thread is a nut-like cutting tool that is used to cut an external thread that matches the inner thread. Threading is often used to process products such as bolts, studs, etc., so that they can be connected to other threaded parts.

Tapping wires are used to cut threads in existing holes, while threads are used to cut external threads. While making a threaded connection, tapping is used to make the internal thread in the hole, while sleeve wire is used to cut the outer thread to match the inner thread. These two methods are often used together for the purpose of a threaded connection.

The role of tapping and threading:

First, the role of tapping.

1. Tapping is used to cut out the internal thread in the material, so that it can be connected with the external threaded parts (such as screws, nuts, etc.).

2. Sometimes the hole may have problems such as unevenness or rubbing, tapping can trim the surface of the hole and cut the thread at the same time.

3. When the thread is damaged or worn, the thread can be repaired and restored to its original function by tapping.

Second, the role of threading.

1. The thread is used to cut the external thread so that it can be connected with the internal threaded parts, such as bolts, studs, etc.

2. The thread can repair the damage or wear of the external thread and restore the original connection capacity.

3. By using the threading tool, you can check whether the threaded parts are closely matched with the threading tool to judge its quality and accuracy.

Tapping refers to using a certain torque to screw the tap into the bottom hole to be drilled to process the internal thread.

Threading is to use plate teeth to process external threads on the round rod.

The orifice of the threaded bottom hole on the workpiece should be chamfered, and both ends of the through-hole thread should be chamfered. The position of the workpiece clamp should be correct, and the center line of the threaded hole should be placed in a horizontal or vertical position as much as possible, so that the tapping is easy to judge the tap shaft. It is important to choose the right lubricant for tapping, and in the case of not cleaning the leather stool, it is necessary to use a self-cleaning tapping lubricant, and for difficult workpieces, it is necessary to use pure oily tapping oil.

Rigid tapping:

It is also known as "synchronous feed tapping". The rigid tapping cycle synchronizes spindle rotation with feed to match specific thread pitch needs. Since the feed into the hole is synchronized, it is theoretically not possible to use a solid tap clamp with any tension compression.

Extended] "Rigid tapping", also known as "synchronous tapping", is to synchronize the spindle rotation with the Z-axis feed to match a specific thread pitch. Theoretically, when tapping threads, when the spindle rotates, the total feed of the Z-axis should be equal to the pitch of the tap.

"Flexible tapping" is also known as "floating tapping", that is, there is no strict synchronous proportional relationship between the spindle speed and the feed, and the spindle speed and the Z-axis feed are independently controlled. The flexible tapping tool holder has the function of adjusting the clearance, and it is generally a spring chuck with elastic shrinkage function along the axis.

Rigid tapping is proposed for the shortcomings of the above mode, it is equipped with a position encoder on the spindle, the angular position of the spindle rotation is fed back to the technical control system to form a position closed loop, and at the same time the synchronous relationship with the Z-axis feed is established, so that the linear proportional relationship between the spindle rotation angle and the Z-axis feed size is strictly guaranteed. Because of this synchronous relationship, even if the angle of rotation of the spindle or the position of the Z-axis movement caused by the difference in inertia, acceleration and deceleration time constants, and load fluctuations do not affect the machining accuracy, because the spindle rotation angle is synchronized with the Z-axis feed, and no matter if any one side is disturbed and changes in the tapping, the other side will also change accordingly, and the linear proportional relationship will always be maintained. If we use rigid tapping to machine the threaded hole, we can clearly see that when the z-axis tapping reaches the position, the spindle rotation and the z-axis feed are decelerated and stopped at the same time, and the spindle reversal is the same as the z-axis reverse feed.

It is precisely because of the synchronization relationship that the tap chuck can be used with an ordinary drill chuck or a simpler special chuck, and when rigidly tapping, as long as the strength of the tool (tap) allows, the spindle speed can be increased a lot, and the spindle speed of 4 000r min is no longer a problem. The machining efficiency is increased by more than 5 times, and the thread accuracy is also guaranteed, which has become an indispensable main function of the machining center.

Rigid tapping plus M29 plus G84. Only G84 is used for flexible tapping, but there is a flexible tapping head. There is a quasi-stop on the machining center. There is no need to use flexible tapping.