Introduction to the use of powder metallurgy taps

Release time:

2022-10-24

The extrusion cone at the front end of the powder metallurgy tap is a tapered thread. In order to reduce friction and extrusion pressure, the cross-section of the powder metallurgy tap is made into a polygon. High extrusion tap strength.

　　powder metallurgy tapThe use of tap grinding parameters is not suitable; the workpiece material is too hard; the tap grinding quality is poor, the cutting fluid is improperly selected; the tap thread cutting speed is too fast. The faucet is badly worn. Appropriately increase the tap of the rake angle, reduce the cutting taper; heat treatment, appropriate to improve the hardness of the workpiece; to ensure that the cutting surface of the tap has a lower surface roughness value; choose a good lubricating cutting fluid; appropriately reduce the cutting speed; replace the old faucet. When tapping the screw hole of glue material, lubricate coolant should be added. For iron and steel materials... generally use oil or a large concentration of emulsion with higher requirements, available vegetable oil or molybdenum disulfide. For stainless steel, use No. 30 oil or vulcanized oil. Powder metallurgy taps are almost always used for small internal threads.

　　powder metallurgy tapThe extrusion cone at the front end is a tapered thread. In order to reduce friction and extrusion pressure, the cross-section of the powder metallurgy tap is made into a polygon. The extrusion tap has high strength and is especially suitable for processing small screw holes with a diameter of less than 6mm. Jump tap: alternately grind a tooth along the spiral direction of the tool tooth, thereby increasing the chip thickness, which is conducive to the removal of chips and chips. It is used for processing stainless steel and other workpieces. Content chip tap: The chip is discharged from the inner hole of the tap for processing large-size screw holes. Automatic shrinkage tap: After tapping, the powder metallurgy tap teeth automatically shrink inward and exit quickly. Broaching tap: It is a broach with spiral teeth distributed on the knife. It is commonly used to process hard alloy taps with square threads and trapezoidal threads. It is mainly used to process cast iron and non-ferrous metal powder metallurgy taps with high cutting efficiency and tool life. Spiral pointed taps made of what material are also called pointed taps, suitable for deep holes and threads, with high service strength, long life, fast cutting speed and stable size.

Due to the large number of cast iron and aluminum alloy parts processed by the automotive industry, carbide taps are used to obtain long tool life. When using these materials, carbide taps have a longer life than high-speed steel taps. In the automotive industry, the shortening of the tool change time of the push wire is obviously an important factor, and the extension of the life of the carbide push wire will reduce the tool change time. It is very effective to tap aluminum alloy workpieces with silicon content of 8%-12% by using carbide coated taps with small spiral angle.

Tool steel: mostly used for hand incisor taps, which is not common at present; Cobalt-free high-speed steel: currently widely used as tap material, cobalt-containing high-speed steel: currently widely used as tap material,powder metallurgy tapUsed as a high-performance tap material, the performance is significantly improved than the above two, the naming method of each manufacturer is different, hard alloy material: usually use ultrafine particles, good toughness grade, mainly used in the manufacture of straight flute tap processing short chip materials, such as gray cast iron, high silicon aluminum and so on. Threaded metal fibers do not break and form a chilled layer on the surface.

The thread speed of the tapping tap is too fast; the grinding parameters of the tap are not suitable; the cutting fluid is improperly selected and used; the hardness of the workpiece material is too high; when the tap is ground, it will burn out. Appropriately reduce the cutting speed; reduce the front angle of the tap and lengthen the length of the cutting cone; select the cutting fluid with good lubricity; carry out appropriate heat treatment on the processed workpiece; correct sharpening use. The front angle of the powder metallurgy tap is too large; the cutting thickness of each tap tooth is too large; the quenching hardness of the tap is too high; the faucet is severely worn.