I believe that all the people engaged in machining encountered a break from TAP.
1. The tap is of poor quality
Main materials, design of CNC tools, heat treatment situation, treatment accuracy, coating quality, etc. For example, the difference in size between the transitions of the transverse section of the TAP or the transition net is not designed to cause a concentration of stress, which is subject to the fracture at the constraint concentration when used . The transition from the transverse section to the junction of the handle and the blade is too close to the welding wearing, resulting in the complex welding stress superimposed on the concentration of constraint to the transition of the transverse section, resulting in a large concentration of constraint , resulting in the breakdown of the rupture of the rupture Press the use. For example, the heat treatment process is inappropriate. During the heat treatment of the taps, if the tap is not preheated before the caliber and heating, overheated or overlorded, imperative or cleaned too early, it can cause cracks in the tap. To a large extent, this is also an important reason why the overall performance of interior taps is not as good as that of imported taps.
2. Selection of inappropriate valves
High quality taps must be used for attack parts with too high hardness, such as high -speed steel taps containing cobalt, cemented carbide taps, coated taps, etc. In addition, different TAP conceptions are used in different workplaces. For example, the number, the size, the angle of the discharge heads of the tap chip have an impact on the discharge performance of the chip.
3. The tap does not correspond to the treated material
This problem has received more and more attention in recent years. With continuous increase and the difficulty in treating new materials, in order to meet this need, the variety of tool materials also increases. This requires choosing the right product before typing.
4. The diameter of the hole in the lower hole is small
For example, when processing M5 × 0.5 ferrous metal threads, the basic hole should be used to use a forest with a drill with a diameter of 4.5 mm. Must be cut during tapping will inevitably increase. It is recommended to choose the diameter of the correct lower hole depending on the type of tap and the tap material.
5. Problems of attack equipment
The material of the attack part is impure, with hard points or pores in the region, which means that the tap loses balance instantly and breaks.
6. The tool machine does not meet the precision requirements of the TAP
Machine-tools and tightening bodies are also very important, especially for high quality taps. The common thing is that the degree of concentricity is insufficient. When the tapping begins, the tap begins incorrectly, that is to say that the axis of the spindle is different from the midline of the bottom hole, and the torque is too high during the tapping, which is The main reason for breaking the tap.
7. The quality of cutting the liquid and lubrication oil is not good
Many national companies have started to pay attention to this point. And the lifespan is also possible.
8. Unreasonable speed and cutting power
When treatment problems occur, most domestic users reduce cutting speed and reduce the power rate. . However, if the power speed is too fast, the too big torque stroke can easily cause the tap. The cutting speed during the machine is generally 6 to 15 m / min; In the same material, the diameter of the tap is smaller and the diameter of the tap is lower.
9. The skills and skills of operators have not satisfied the requirements
The above problems force operators to make judgments or comments to technical staff, but most national operators do not pay attention. For example, when treating the blind hole threads, when the tap is about to touch the bottom of the hole, the operator does not realize that it always feeds at the speed of the tap before reaching the bottom of the hole, or to power it by force when the chips are not smooth, which brings the tap if the tap is broken. It is recommended that operators strengthen their sense of responsibility.
From the above, there are many reasons for the breakdown of the tap, including machine tools, lighting, pieces, crafts, mandrels and tools, etc., and the real reason can Never be found by speaking on paper. As an application for applying qualified and responsible tools, the most important thing is to go deep into the site, not only on the basis of the imagination.
Daguang focuses on providing solutions such as precision CNC machining services (3-axis, 4-axis, 5-axis machining), CNC milling, 3D printing and rapid prototyping services.
