An overview of tapping on stainless steel "target=_blank> stainless steel is much more difficult than tapping on common steel. It is often the case that due to the large torque, the tap is "killed" in the screw hole, chipping or breaking, the thread surface is not only , groove pattern, oversize, chaotic buckle and serious wear of the tap. Therefore, the technical measures should be taken to solve the stainless steel "target=_blank> stainless steel thread.
1. When attacking stainless steel "target=_blank> stainless steel thread, the phenomenon of "dwelling" is more serious, and the tap is easy to "bite" in the hole, so the bottom hole of the thread should be appropriately enlarged. Under normal circumstances, the pitch is less than 1mm. The diameter of the bottom hole of the thread is equal to the nominal diameter minus the pitch; when the pitch is greater than 1 mm, the diameter of the bottom hole of the thread is equal to the nominal diameter minus 1.1 times the pitch.
2. Choosing the right tap and reasonable cutting amount is the key to the quality of tapping. Tap material, should be selected from cobalt or aluminum super-hard high-speed steel; the main declination and pitch, tap number, head cone κr = 5 ° ~ 7 °, two cones, three cones κr = 10 ° ~ 20 °; calibration The part generally takes 3 to 4 thread lengths and has an inverted cone of 0.05 to 0.1 mm/100 mm; the direction of the chip pocket is generally β=8° to 15°, which can control the flow direction of the chip. For straight groove taps, The front end of the tap is modified into a spiral shape; the front angle of the tap is generally γp=15°-20°, and the back angle is 8°～12°.
3, can use stainless steel "target=_blank> stainless steel tapping without slotted tap.
4, stainless steel "target=_blank> stainless steel tapping, should ensure that there is enough cooling lubricant. Usually stainless steel "target=_blank> stainless steel special tapping oil.
5. In the process of tapping, if the tap is broken, the workpiece can be placed in a nitric acid solution for corrosion, and the high-speed steel wire cone can be quickly corroded without scrapping the workpiece.
The two-purpose professional is suitable for the lubrication of stainless steel "target=_blank> stainless steel metal products such as tapping and tapping.
Three characteristics 1, can effectively reduce the friction between the workpiece and the wire attack, reduce wear, has a strong oil film, lubrication and anti-wear extreme pressure performance is the industry's leading level.
2, to prevent surface scratches and wrinkles, can effectively improve work quality and work efficiency.
3, inhibit the temperature rise, reduce the occurrence of sintering and card biting, extend the life of the mold, protect the tool.
4, inhibit the production of black sludge, does not corrode the workpiece; the cooling effect is outstanding.
Four physical and chemical indicators Appearance: light red oily liquid
Specific gravity: greater than 0.95
Smell: near tasteless
Kinematic viscosity (40 ° C, CST): greater than 60
Flash point (opening, °C): greater than 150
Gold processing lubrication anti-wear value (25 ° C, N: greater than 10000
Five methods of use 1, according to the requirements of metal cutting process, a variety of different forms of oiling methods can be used;
2. It is not recommended to use it for dilution. If it is necessary to dilute it, it can be diluted with low viscosity oil such as “odorless kerosene, vegetable oil and low viscosity mineral oilâ€.
Six matters needing attention 1, oil should be even, and ensure a thick enough lubrication film to increase lubrication performance;
2. It is forbidden to mix metal debris, wire hair and other debris; it should be sealed and stored away from open flames;
3. This oil is strictly prohibited from coming into contact with water. Otherwise it will reduce oil performance;
4. It is strictly forbidden to eat.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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