SU422553A1 - TAP - Google Patents

Description

one

The invention relates to metal working.

Known taps, thread-forming elements on the intake cone are made in the form of feathers.

The proposed tap differs from the known one in that the number of thread-forming elements on the calibrating part exceeds their number on the intake cone.

The thread-forming elements on the calibrating part are made in the form of feathers and the number of feathers in the area of the intake cone adjacent to the calibrating part corresponds to the number of feathers on it.

The cross section of the gage part has the shape of a polyhedron whose vertices are thread-forming elements.

Such a tapping ensures the formation of precise threads in the holes with a discontinuous surface and uneven exit.

Pa figs. 1 shows a tap with an increased number of 1 feathers on the calibrating part; in fig. 2 is a section along A-A in FIG. one; in fig. 3-section along BB in FIG. one; in fig. 4- tap, the number of feathers in the area of the intake cone, which is adjacent to the calibrating part, corresponds to the number of feathers on it; in fig. 5 - tap, the calibrating part of which has the shape of a polyhedron in cross section; in fig. 6 is a section along BB in FIG. five.

The intake cone on the length Is of the tap is, for example, performed with three pens, and at the calibrating part, with a brush of 1-6 pins. The tap can also be made with three feathers only in the initial part of the intake cone, and in the area adjacent to the calibrating part, with the same number of feathers as on it, where S is the thread of the thread. The number of feathers on the calibrating part is selected depending on the angle of inclination of the oblique (non-uniform) output of the hole being machined.

When cutting threads in the holes with an oblique exit at a time when a reduced number of teeth (feathers) of the intake cone begins to exit from the hole on them in the radial direction, a force acts that through the increased number of cutting, their edges (feathers) on the calibrating part are transferred to cut thread profile. If the specific force, coming from 1 mm of the length of the side cutting edges of the calibrating teeth, is less than the specific force for cutting, there will be no cutting of the finished thread profile. This provides the design of taps with an increased number of feathers on the calibrating part. Palichi on the plot cone / 1 intake cone increases its dimensional stability, so

how much wear at the taps is observed in the transition zone from the intake cone to the gage part.

To form a thread by the method of plastic deformation, the cross section of the -calibration part has the shape of a polyhedron, the vertices of which are thread-forming elements. When machining a thread with such a tap, the onoric edges do not cut off the strill, no matter how radial force would act on the tap, therefore, when threading in holes with an oblique exit, the thread will be accurate, without shape errors, as the exact kinematic law of the movement of the tap is ensured.

Subject invention

Claims (4)

1. Tap, thread-forming elements on the intake cone which is made in the form Feathers, characterized in that, in order to form accurate threads in the holes with a discontinuous surface and uneven output, the number of thread-forming elements on the calibrating part exceeds their number on the intake cone. 2.Metchik on n. 1, that is, with the fact that the thread-forming elements on the calibrating part are made in the form of nerves. 3.Metchik but np. 1 and 2, characterized in that, in order to improve the dimensional stability of the tool, the number of feathers in the area of the intake cone adjacent to the gage part corresponds to the number of feathers on it. 4. The meter according to claim 1, characterized in that, in order to calibrate the thread by the method of plastic deformation, the cross section of the calibrating part has the shape of a polyhedron whose vertices are thread-forming elements. tfttoJ Fig 1 jjitw w w rig .5