1. The quality of the tap is poor:
Main materials, tool design, heat treatment conditions, 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. 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 TAP:
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 bottom hole hole is relatively 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. Attack material problems:
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 the cutting of liquid and lubrication oil is poor:
Many national companies have started to pay attention to this point. And the lifespan is also possible.
8. The cutting speed and the power capacity are unreasonable:
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 operator’s skills and skills did not meet 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.
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.
