Application of powder metallurgy tap

Release time:

2022-12-22

Application of powder metallurgy taps: The grinding parameters of powder metallurgy taps are not suitable; the workpiece material is too hard; the tap grinding quality is poor, and the cutting fluid is improperly selected; the cutting speed of the tap thread is too fast. The faucet is badly worn. Appropriately increase the tap rake angle, reduce the cutting taper;

　　powder metallurgy tapApplication

粉末冶金丝锥

The grinding parameters of the powder metallurgy tap are not suitable; the basic items of the workpiece are too hard; the grinding quality of the tap is poor, and the cutting fluid is improperly selected; the cutting speed of the tap thread is too fast. The faucet is badly worn. Appropriately increase the tap front angle and reduce the cutting taper; heat treatment should be carried out to appropriately increase the hardness of the workpiece; ensure that the cutting surface of the tap has a low surface roughness value; select the cutting fluid with good lubricity; appropriately reduce the cutting speed; replace the old faucet. When tapping the screw holes of the bonded base article, add lubricating coolant. For steel base items, a higher concentration of oil or emulsion is usually required, and vegetable oil or molybdenum disulfide can be controlled. For stainless steel, control No. 30 oil or vulcanized oil. Powder metallurgy taps are almost always made into small internal threads. 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. The extrusion tap has high strength and is especially suitable for secondary treatment of small screw holes with a diameter of less than 6mm. Jumping tap: alternately grind a tooth along the spiral direction of the cutter tooth to increase the thickness of the crushing, which is conducive to the removal of crushing and crushing, and makes secondary processing of stainless steel and other workpieces. Crushing tap: crushing is discharged from the inner hole of the tap to make a large screw hole for secondary treatment. Automatic shrinkage tap: After tapping, the powder metallurgy tap teeth automatically shrink inward and exit quickly. broach tap: is a kind of spiral tooth broach distributed on the tool, often made of square and trapezoidal thread secondary treatment of strong metal material tap: mainly made of secondary treatment of high cutting efficiency, long tool life of cast iron and non-ferrous metal powder metallurgy tap. Spiral taps made of what basic items are also called taps and are suitable for deep holes and threads. High control strength, long control life, fast cutting speed and stable size.

With the secondary processing of a large number of cast iron and aluminum alloy parts in the automotive industry, strong metal taps are used to extend the life of the tool. When handling these basic items, strong metal taps have a longer handling life than high-speed taps. In the automotive industry, the shorter tool change time is obviously an important factor, and the longer service life of the strong metal push wire will reduce the tool change time. It is very effective to tap aluminum alloy workpieces containing 8% to 12% silicon with small helix angle strong metal coated taps.

Tool steel: mainly made of hand-cut taps, which is not common at present; cobalt-free high-speed steel: currently widely used as tap basic items, cobalt-containing high-speed steel is widely used as tap basic items, and powder metallurgy taps are used as high-performance tap basic items. The performance is significantly improved compared with the above two. Different manufacturers have different naming methods. Strong metal basic items: usually use fine particles with good toughness grade, mainly made of short crushing basic items such as gray cast iron, high silicon aluminum and so on. The metal fibers will not break and a chilled layer will be formed on the surface.

Tap thread work speed develops too fast; tap grinding technology parameter method is improper; cutting fluid selection and control management is improper; workpiece structure foundation item has too high hardness requirement; when the tap is grounded, it will burn through. Appropriate can reduce the cutting processing speed; Reduce the rake angle of the tap and extend the length of the tap; Select a cutting fluid with good lubricity; Treat yourself between the workpieces in the secondary treatment process for an appropriate heat treatment; Correct sharpening utilization rate.powder metallurgy tapThe rake angle is too large; the cutting thickness of each tap tooth is too large; the tap quenching hardness is too high; the faucet wear problem is serious.