Classification and characteristics of powder metallurgy taps

Release time:

2022-11-02

there are so many kinds of powder metallurgy tap, how to choose?powder metallurgy tapAs a common tool for processing internal threads, it can be divided into spiral groove taps, side taps, straight groove taps and pipe thread taps according to its shape. According to the use environment, it can be divided into manual powder metallurgy taps and motorized powder metallurgy taps. According to specifications, it can be divided into metric taps, N-type taps and powder metallurgy taps. Tap is also the main tool used in tapping through machining technology. So how to choose a powder metallurgy tap? Today I share with you a powder metallurgy tap selection guide to help you choose the right powder metallurgy tap.

Cutting powder metallurgy tap straight groove tap: used for through hole, blind hole processing, tap groove in the use of iron filings, the processing of the thread work quality level is not high, mostly used for processing short chips, such as gray cast iron. Thread tip tap: usually we can only use it through the through hole, the length-diameter ratio can reach 3D ~ 3.5D, the iron filings are discharged next, the torque in the cutting process is small, the thread processing surface work quality is high, also known as edge dip tap or sharp tap. When cutting, ensure that all cutting parts are penetrated, otherwise there will be tooth collapse.

Extruded powder metallurgy taps can be used to process through holes and blind holes, and teeth are formed by plastically deforming materials, which can only be used to process plastic materials. The main characteristics of powder metallurgy tap are as follows: the plastic deformation of the workpiece is used to process the thread; The tap has large cross-sectional area, high strength, is not easy to break, the cutting speed is higher than that of the cutting tap, and the productivity is correspondingly improved. Due to cold extrusion, the mechanical system performance of the processed thread surface can be effectively improved, with high surface roughness, thread working strength, wear resistance, corrosion resistance and improvement. Chip-free processing.

There are two structural forms: oil-free groove extrusion taps are only used for blind hole vertical addition; extrusion taps with oil grooves are suitable for all different working conditions of enterprises, but usually small diameter taps do not design oil grooves due to technical difficulties in Chinese manufacturing. Powder metallurgy tap structure parameters Appearance size, total length: should pay attention to some working conditions that require special lengthening. Groove length, thread part accuracy: selected according to specific thread standards, metric thread ISO1/3 grade is equivalent to national standard H1/2/3 Grade, but need to pay attention to the manufacturer's internal control standards. Cutting cone: The cutting part of the tap can already form a local fixed asset mode. Usually, the longer the cutting cone, the better the life of the tap.

Trough type: affect the use of iron forming and discharge, usually for the manufacturers of internal corporate secrets. Front angle and rear angle: When the tap becomes sharp, the cutting resistance can be significantly reduced, but the tooth tip strength and stability are reduced. The back angle is the back angle of shovel grinding. Number of grooves: The increase in the number of grooves and the increase in the number of cutting edges can effectively improve the life of the tap, but it will compress the chip removal space and be at a disadvantage in chip removal.powder metallurgy tapMaterial tool steel: mostly used for hand incisor taps, which is not very common to us at present. Cobalt-free high-speed steel: currently widely used as tap material.