The choice of the threading tool and the residual choice of the turning process
A kind of cutting tool, a kind of cutting tool used to cut the thread on the lathe. Threading tool divided into two major categories of threading tool within and outside the threading tool, from the early stages of mechanical manufacturing use requires manual grinding welding head of threading tool grinding, high speed steel material into the threading tool, thread turning tool of high speed steel comb blade and machine clip-on threading tool, such as machine clip-on threading tool is currently widely used machine clip-on threading tool, machine clip-on threading tool divided into two parts, tool holder and the blade, blade mounted on the cutter bar mat, compaction with bolt, blade mounted on the mat, the blade is divided into carbide not coating blade, blade used for processing non-ferrous metal, such as: aluminum, aluminum alloy, copper, copper alloys and other materials), carbide blade coating (used for machining steel, cast iron, stainless steel, alloy, etc.).
Choices include: M10 thread cutting, screw car to 9.8 then thread M12 first car to 11.8 and then, the same requirements when turning Wire thread with large diameter ratio is small 20. Principle: 3 Angle of thread fast molding Due to the extrusion of thread cutting tools and thread the top part is very thin due to cutting So consider these reasons must be small 20 silk Otherwise because now basic machine clamp tool is pitch limit dead is 2 mm to 2 mm thread
Metric common thread with 60 ° Angle of knife mold, national standard trapezoidal thread with 30 ° Angle of knife mold. Residual quantity of thread: after the thread of the car, the grinding thread should be left with 0.6 to 0.8 mm in the diameter of the diameter. Keep 0.3 to 0.5 mm spare from coarse thread to fine car. The total depth of the vehicle thread is 0.65 P.
Commonly used 60 ° thread is metric thread that gb, 55 ° is inch thread and pipe thread (another 60 ° pipe thread is not commonly used), 30 ° is trapezoidal thread, 40 ° is the worm. And the serrated thread. The diameter of a triangle thread is usually 0.2 to 0.3 mm smaller than the standard metric. The compression of thread cutting tool will make the diameter of the workpiece be coarser because of the tip of the triangle thread. The same is true for car peing and thread. In the case of the trapezoidal thread and worm, the small 0.2 mm is due to the measurement of the diameter to meet the standard.
The 20 points that I'm here for you Ha ha 60 degrees is metric thread that is China's first standard 55 degrees is 30 degrees inch thread is trapezoidal thread The other pipe thread serrated vortex rod and so on many kinds The following M10 thread turning the question which the allowance Screw car to 9.8 then thread M12 first car to 11.8 then the same request when turning Wire thread with large diameter ratio is small 20 principle: 3 Angle of thread fast molding Due to the extrusion of thread cutting tools and thread the top part is very thin due to cutting So consider these reasons must be small 20 silk Otherwise because now basic machine clamp tool is pitch limit dead is 2 mm to 2 mm thread Don't small car Thread is very ugly
