Analysis of the Breaking Problem of CNC Machining Tap

1. The quality of the tap is not good:

Main materials, CNC tool design, heat treatment conditions, machining accuracy, coating quality, etc. For example, the size difference at the transition of the tap section is too large or the transition fillet is not designed to cause stress concentration, and it is easy to break at the stress concentration during use. The section transition at the junction of the shank and the blade is too close to the welding port, which leads to the superposition of complex welding stress and the stress concentration at the section transition, resulting in a large stress concentration, which causes the tap to break during use. Metal processing WeChat, the content of the website is good, worthy of attention. For example, improper heat treatment process. During the heat treatment of the tap, if the tap is not preheated before the quenching is heated, the quenching is overheated or burned, the tempering is not in time, and the cleaning is too early, it may cause the tap to crack. To a large extent, this is also an important reason why the overall performance of domestic taps is not as good as imported taps. 2. Improper selection of taps:

High-quality taps should be selected for tapping parts with too large Hardness, such as cobalt (gǔ) high-speed steel wire taps, hard alloy (belonging to the 3D term of Welfare Lottery) gold taps, coated taps, etc. In addition, different tap designs are used in different workplaces. For example, the number, size, angle, etc. of the chip flute of the tap have an impact on the chip removal performance.

3. The tap does not match the processed material:

This issue has received more and more attention in recent years. In the past, domestic manufacturers always felt that imported goods were good, but expensive goods were good. In fact, they were suitable. Dongguan CNC machining has higher production efficiency in the case of multiple varieties and small batch production, which can reduce the time of production preparation, machine tool adjustment and process inspection, and reduce the cutting time due to the use of the best cutting amount. With the continuous increase of new materials and difficulty in processing, in order to meet this need, the variety of tool materials is also constantly increasing. This requires that before tapping (tool: tap or tap), choose (xuanze) a suitable tap product.

4. The aperture of the bottom hole is too small:

For example, when machining M5×0.5 threads of ferrous metal materials, a 4.5mm diameter drill should be used to make the bottom hole with a cutting tap. If a 4.2mm drill bit is used to make the bottom hole by mistake, the cutting part of the tap will inevitably increase when tapping. , And then break the tap. Huizhou CNC machining has great advantages over manual machining. For example, the parts produced by CNC machining are very accurate and repeatable; CNC machining can produce parts with complex shapes that cannot be completed by manual machining. Numerical control machining technology is now widely promoted. Most machining workshops have CNC machining capabilities. The most common CNC machining methods in typical machining workshops are CNC milling, CNC lathe, and CNC EDM wire cutting (electric discharge wire cutting). It is recommended to choose the correct bottom hole diameter according to the type of tap and the material of the tap.