The main uses of threaded milling cutters and common problems

A thread milling cutter is one of the thread processing tools. The method of machining threads with a thread milling cutter is called thread milling. Thread milling cutters are used in various sectors such as automotive, aerospace, medical, and machining, and as they are used in a wide range of applications, the requirements for their use are increasing. Here we summarize and answer the common questions about the use of thread milling cutters.

1, How to distinguish between thread milling cutters and chip taps?

If it is a single tooth thread milling cutter, it is easy to distinguish; if it is a multi-tooth one, it is also easier. The most direct way is to look at the top teeth. The tap is a spiral tooth, and the thread milling cutter is a circle tooth.

2, Does the tooth depth of the thread milling cutter have any effect on the thread accuracy?

In fact, the thread accuracy is usually checked with a through stop gauge, and the main influence on the through stop gauge is the tooth pitch and the opening width of the root. Generally speaking, the depth of the teeth does not affect the inspection of the through gauge. When actually milling threads, adjusting the radius of the milling tool seems to affect only the through gauge but not the stop gauge. In other words, the slight change of the large diameter and small diameter only affects the through gauge, not the stop gauge.

3, Is the thread milling cutter made of carbide steel?

Yes, at present, the manufacturing material of thread milling cutter is carbide, and the processing line speed can reach 80~200m/min, while the processing line speed of HSS tap is only 10~30m/min, so the thread milling cutter is suitable for high speed cutting, and the surface finish of processing thread is also greatly improved.

4, What is the difference between straight groove thread milling cutter and spiral thread milling cutter?

It is generally believed that the straight groove and the spiral groove have different chip removal methods, the former is downward chip removal and the latter is upward. The spiral groove also has an anti-vibration function. It should always be in contact with the cutting surface with the same number of teeth. The straight groove will have a clearance section. The straight groove is not as deep as the spiral groove, so the strength of the tool is stronger than the spiral groove.

5, Why do thread milling tools always break?

This problem can be caused by many factors: the runout of the machine spindle. The stability of the clamping, the size and depth of the bottom hole, the material of the tool and the design itself, the collision tool, and the unreasonable parameters.

6, How to grind 60 degrees for internal threads in CNC turning?

The threaded tool is divided into internal and external threads, but the sharpening principle is the same. The sample has a concave tip angle of 90 degrees and is evenly aligned. When sharpening. Use the tool against the sample while sharpening. Until the seam is closed and perpendicular to the sample. Then the lower part can be sharpened more. In order not to collide with the turning workpiece. The general principle is that the top is wide and the bottom is narrow. The top is long and the bottom is short.

7, What is the difference between thread milling cutter, wave edge milling cutter and tap?

Thread milling cutters are mainly used for internal and external threads, and are more efficient than taps. Wave edge milling cutters can be classified as general milling cutters, mainly used for rough machining of products. The tap is used for tapping with higher precision. These three types of tools from the appearance of a little bit to the direction.

8, Can the milling cutter for internal thread milling be used for external thread milling?

Basically no, although I have never milled threads, but generally speaking, the thread milling cutter moves against the inner diameter of the bore according to the trajectory, and the tool does not take too much force. However, the size of the external thread cannot be guaranteed, unless the tolerance is not too high. You can check the instructions of the CNC equipment, and consult with the technical staff of the equipment manufacturer to communicate. Generally speaking, the external threads are handled by turning or sheet metal taps.

9, What is the difference between tap and thread milling cutter?

If it is a single tooth thread milling cutter, it is easy to distinguish; if it is a multi-tooth cutter, it is also easier. The most direct way is to look at the upper teeth. Tap is a spiral tooth, thread milling cutter is a circle tooth