In addition to the reasonable use of oil, what should be paid attention to in tapping process?

Time：

2021-08-06 11:28

Tap, also known as tap, is a widely used tool for thread hole processing. The problems often occur in tapping process of tap include: fracture, chipping, wear, etc. It has seriously affected its normal service life and added cost pressure to the factory. Why does the tap break, break and wear? It can be analyzed from the following aspects:
1. Effective cooling and lubrication: because the working process of the tap is to cut in a very narrow space and discharge the chips, and this process will generate a lot of heat, so the tapping oil selected should have cooling and permeability. If it is a soft material, it should have better chip removal performance, otherwise it will be easy to get chips, and it will also speed up the wear of the tap. For tapping of some materials with high hardness, it is necessary to strengthen the lubricity and extreme pressure performance of tapping oil. Therefore, in order to extend the service life of the tap, Javier recommends that customers use professional tapping oil reasonably, which can reduce the cost of replacing the tap through effective lubrication and cooling.
2. Machine tool problems: check whether the machine tool operates normally, whether the spindle runout is too large, whether the machine tool spindle is coaxial with the bottom hole, and whether the processing procedure is correct.
3. Thread bottom hole diameter and hole depth: check whether the diameter of the thread bottom hole is correct. If the diameter of the bottom hole is too small, the root of the tap will contact the workpiece during cutting, which is easy to cause the tap to break. The diameter of the thread bottom hole is marked in the tap sample, or the bottom hole diameter can be obtained by using the formula (bottom hole diameter=thread diameter - pitch). For extrusion taps, the diameter of the thread bottom hole is different from that of the cutting tap, and the approximate bottom hole diameter can also be calculated according to the formula (bottom hole diameter=thread diameter - pitch/2). For blind holes, the depth of the bottom hole also needs to be considered. Because there are several cutting teeth at the front end of the tap, and the diameter of these cutting teeth is relatively small, which cannot be considered as effective threads. Therefore, the depth of the cutting teeth and the size of the sharp corner at the front end of the tap should also be considered for the depth of the bottom hole. In production, there have also been cases where the bottom hole is not deep enough and the front end of the tap touches the hole bottom, causing the tap to break.
4. Workpiece material: check whether the material strength of the workpiece is too high, whether the material quality is stable, and whether there are pores, residues, etc
5. Whether the correct tap type is selected: for different processing conditions and different processing materials, the type of tap selected is also different. First of all, for the two different processing conditions of through-hole and blind hole, the material of long chip, such as steel, in the case of through-hole, select the straight slot tap, and the chip is discharged downward; In the case of blind hole, select the screw tap, and the chips are discharged upwards.
For short chip materials, such as cast iron, iron chips are chips and can be contained in the chip removal groove. Therefore, through holes and blind holes can be processed with straight groove taps. In another case, the downward chips formed by the * * tap are separated. This tap is applicable to the situation that the workpiece is close to the tooling and the chip removal space is not enough. On the other hand, for cutting taps and processing different materials, we should choose taps with different grooves. There are various angles on the tap, such as front angle, rear angle, guide angle, edge inclination angle, etc. These angles are designed according to the characteristics of different materials. For example, for steel parts and cast iron, due to the long chip of steel parts, the front angle of the tap is designed to be larger, while the iron chip of cast iron is generally debris, and the front angle is relatively small, even 0 ° front angle. The tool company will give different recommended taps for different workpiece materials. For taps made of steel, aluminum alloy, cast iron, stainless steel and other common materials, they may also be distinguished by different color rings on the handle.
6. Cutting parameters: cutting parameters are very important. Different types of taps, different processing conditions and different workpiece materials should choose different parameters. For example, under the same conditions, the linear speed of high-speed wire tap and carbide wire tap is very different. This speed has a certain range. The linear speed of high-speed wire tap is generally within 20 m/min (the feed of the wire tap is fixed, that is, the pitch). Too fast or too slow will lead to the failure of the wire tap. Selecting appropriate cutting parameters can ensure the production efficiency and achieve a relatively high service life.

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