1. Poor quality
Material, tool design, heat treatment, machining accuracy, paint quality, etc. are not up to standard, which may easily lead to tapping breakage. For example, when tapping, the moving dimension difference is too large, the transition fillet is not designed, the stress is concentrated, and it is easy to break. The cross-sectional transfer of the joint between the handle and the tool is too close to the welding crater, resulting in complex overlapping of welding stress and stress concentration in the cross-sectional transfer, resulting in a large stress concentration and damage to the tap in use.
2. Unreasonable choice
In order to tap parts with high hardness, high-quality taps must be selected, such as high-speed steel taps, carbide taps, coated taps, etc.
3. Tapping tools are not suitable for processing materials
In recent years, this issue has received more and more attention. In the past, domestic manufacturers have always considered imported tapping tools to be good and expensive. But in fact, many domestic tapping tools are very suitable. With the continuous increase of new materials and the difficulty of processing, the materials of various tools are also increasing to meet this demand.
4. The hole diameter of the bottom hole is too small
For example, when using a 0.5 mm cutting plug, drill the bottom hole with the selected 4.5 mm diameter drill bit by machining the iron base M5X. If a 4.2 mm diameter drill hole is used, the cut portion of the tap should increase during the tapping process and the tap will break. Depending on the type of tapping and the material of the tapped part, it is best to choose the correct drilled hole diameter. If a fully qualified drill is not available, a larger drill can be selected.
5. Location issues
The tapped part is made of dirty material and has a solid place or hole in place. And the immediate end hits off balance and destruction.
6. The machine tool does not meet the requirements of tapping accuracy
Mechanical tools and clamping bodies are also very important, especially for high-quality faucets. Only machine tools and clamping bodies with a certain precision can act as a tap. Insufficient concentricity is common. At the beginning of the tapping, the starting and positioning of the tapping are wrong, that is, the main shaft is not concentric with the centerline of the bottom hole, but the torque between the taps is too large, which is the main reason for the breaking of the tapping.
7. Poor quality of cutting oil and lubricating oil
Many domestic companies are starting to pay attention to this. Many companies that buy cutting tools and machine tools abroad have very deep experience. There are problems with the quality of cutting oil and lubricating oil, and the quality of processed products is prone to burrs and other adverse conditions. At the same time, the service life is greatly shortened.
8. Unreasonable cutting speed and feed rate
When there is a problem in processing, because most domestic users reduce the cutting speed and feed speed, the driving force of the tap is reduced, and the precision of the thread produced is greatly reduced. As a result, the roughness of the yarn surface increases, and the threaded opening and yarn precision cannot be controlled. Of course, problems like Boltz's are more unavoidable. However, feeding too fast can cause faucet damage and excessive torque. The cutting speed in mechanical tapping is generally 6~15m/min for steel, 5~10m/min for quenched and tempered steel and hard steel, 2~7m/min for stainless steel, and 8~10m/min for cast iron. In the same material, use higher values for smaller tap diameters and lower values for larger tap diameters.
9. The operator's technology and skills do not meet the requirements
The above issues require operator judgment or feedback from technicians, but most domestic operators do not currently pay sufficient attention to these issues. For example, when dealing with blind hole threads, when the faucet is in contact with the bottom of the hole, the operator is not feeding at the tapping speed before reaching the bottom of the hole or is forced to feed when the chip removal is uneven, causing the tap to break. Operators need to increase their sense of responsibility.
From the above, it can be seen that there are many reasons for the damage to machine tools, fixtures, workpieces, processes, chucks, and tapping (such as tools).
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