RU27905U1 - TAP - Google Patents

Description

2002118410

20021T8410

IMSHSV2365 / Ob

The utility model relates to the processing of metals by cutting, namely, tools for thread cutting, primarily with a 1 step.

A known tap design containing an intake and gauge parts, on which the teeth and chip grooves are located, a tail part, while the intake part, consisting of, starting and completing the formation of a thread profile, is made with a slope according to their diameter and profile. (Encyclopedic alphabet book “Map construction, section 3,“ Production technology of maps, volume 7, M: “State scientific and technical publishing house of map construction literature, 1949, p. 353, Fig. 4).

This design of the tap provides a good direction to the tap at the beginning of the cutting process, but the teeth of the intake part forming the thread profile produce cutting with their entire profile. As a result, a thick box-shaped chip is formed, which does not fit well in the tapered grooves of the tap. This complicates the process of cutting the tap and reduces its durability.

Closest to the proposed solution in terms of the set of features and the achieved result is the design of the fittings, containing the intake and gauge parts, on which are located:

Tap

the teeth and chip grooves, and the tail part, while the intake part, consisting of teeth starting and completing the formation of the thread profile, is made with a slope along their unnecessary diameter. (Frumin Yu.L., "High-performance thread-forming tool 5 ent, M:" State Scientific and Technical Publishing House of Map-Building Literature, 1963, p. 54, Fig. 51).

In the process of threading with such a tap design, the cut chip is easily placed in the chip grooves, which facilitates the process of cutting the tap and increases its durability. However, when threading a large fillet, the required accuracy of the thread is not ensured in one pass of the tap, since at the initial moment of cutting the teeth forming the thread profile into the metal, the sides of the thread profile are trimmed and its first threads are broken. Therefore, to ensure the necessary accuracy of the thread, it is necessary to use taps with an increased length of the intake part and to perform multi-pass cutting of the thread profile. This significantly reduces labor productivity when the thread of the large flank is not.

The objective of the proposed solution is to eliminate these disadvantages.

In order to solve the problem, a tap contains oblique and calibrating parts, on which the teeth and chip grooves are located, the tail part, and the intake part, consisting of a zipper, on which the teeth begin to form the thread profile, and the section.

on which the teeth are located, completing the formation of the thread profile, made with a slope along the outer diameter of the teeth, the authors propose at the intake part at the location of the teeth completing the formation of the thread profile, having a length of O, 3 - O, 5 of the entire length of the intake parts, additionally carry out a slope of the tooth profile, the angle of which is less than the slope angle along the outer diameter of the teeth, and cf & np / n. the diameter of the teeth starting the formation of the thread profile is less than the average diameter of the teeth of the calibrating part.

In this case, the average diameter of the teeth of the intake part, starting the formation of the thread profile, to change the average diameter of the teeth of the calibrating part by 0.2 - 0.8 mm.

With this embodiment, the tap intake part at the initial moment of forming the thread profile with 1 foot pitch produces chips that easily fit into the chip grooves, which facilitates the cutting process of the tap and increases its durability. And the completion of the formation of the thread profile occurs without cutting its sides and breaking the first thread of the thread. As a result, a thread with a round step of the required accuracy is cut in one pass of the tap, i.e. provides increased productivity.

Making the difference in the average diameters of the teeth of the intake part, beginning to form a thread profile, and the teeth of the calibrating part less than 0.2 mm can lead to breaking of the first thread of the thread, and more than about 8 mm will increase the thickness of the chip qpeaaeMofi and increase the load acting on the tap , which will negatively affect his work.

When conducting a search in the patent and scientific and technical literature, no solutions were found containing the combination of the proposed features, which allows us to conclude that the proposed technical solution meets the criterion of “novelty.

Industrial applicability of the proposed solution is visible from the description of the design of the tap

An example of a specific implementation of the proposed design is illustrated by drawings.

In FIG. 1 shows a general view of the tap; FIG. 2 is a profile of teeth forming a thread located on an intake part and a calibrating part; FIG. 3 is a diagram of the operation of the intake part of the tap.

The tap contains an intake 1 and a calibrated 2 parts, on which the teeth 3 and chip grooves 4, the tail part 5 are located, and the intake part 1, consisting of sections 6 and 7 with teeth 3, respectively starting and completing the formation of the thread profile, BbmojmeHa with an angle (p) a slope along the plow diameter of the teeth 3. Section 7 of the intake part 1, on which the teeth 3 are located, completing the formation of the thread profile, has a length (Li), which is O, 3 - O, 5 of the entire length (L) of the intake part 1. In this section 7 is additionally made a slope of the profile of the teeth 3, the angle (f1) which is less than the slope angle (f) in

n the diameter of the teeth. The average diameter (di) of the teeth 3 of the intake part 1 on the portion 6 of the location of the teeth 3, starting the formation of the thread profile, is made 0.2-0.8 mm smaller than the Fed diameter (d2) of the teeth of the calibrating part 2.

The operation diagram of the tap intake part 1 (FIG. 3) shows metal layers 8 that are formed during cutting by teeth 3, which begin to form a thread profile and cut metal layers 9 that are formed during cutting by teeth 3, which complete the formation of a thread profile.

The tap works as follows.

The tail portion 5 is fixed in the machine chuck (not shown in FIG.). The intake part 1 is sent to the hole prepared for threading. The teeth 3, starting the formation of the thread profile, located in section 6, begin the cutting process and cut off the main part of the metal, including the layers to be cut 8. The difference in the size of the average diameter of the teeth in section 6 of the intake part 1 and the calibrating part 2 on OD - O, 8 mm guarantees the absence of breaking of the thread and obtaining the thread of the required accuracy. In addition, the sheared layers 8 are well placed in the chip grooves 4. Then the teeth 3 enter the cutting process 3 in the section 7 of the intake part 1 and the remaining metal is removed in the form of very thin shear layers 9, which are well placed in the chip grooves 4. Then in operation, the teeth 3 of the calibrating part 2, ensuring the desired thread size.

Thus, the use of a tap of the proposed design can significantly increase labor productivity when threading with 1 FUNCTION pitch, since in one pass of such a tap a thread of the required size and accuracy is obtained.

Claims (2)

1. A tap containing the intake and gauge parts, on which the teeth and chip grooves are located, the tail part, while the intake part, consisting of a section on which the teeth are located, starting to form a thread profile, and from a section on which the teeth are located, ending the formation of the thread profile is made with a bias along the outer diameter of the teeth, characterized in that the intake part at the location of the teeth completing the formation of the thread profile having a length of 0.3-0.5 of the entire length of the intake part additionally made a slope of the thread profile, the angle of which is less than the slope of the outer diameter of the teeth, and the average diameter of the teeth starting to form the thread profile is made smaller than the average diameter of the teeth of the calibrating part. 2. The tap according to claim 1, characterized in that the average diameter of the teeth of the intake part, starting the formation of the thread profile, is made smaller than the average diameter of the teeth of the calibrating part by 0.2-0.8 mm.