RU2285589C2 - Cutting tip - Google Patents

Abstract

FIELD: working metals by cutting, built-up cutting tools.

SUBSTANCE: cutting tip includes base and one or more supporting lateral surfaces for mounting it in seat of body. In order to improve reliability of mounting cutting tool with self-clamping fastening mechanism in seat of body, said lateral supporting surfaces are provided with supporting lands. Said lands are inclined relative to base in such a way that apex of their inclination angle is arranged at side of motion of cutting tip to be clamped.

EFFECT: improved reliability of cutting tip mounting.

10 cl, 1 dwg

Description

The invention relates to cutting tools for metalworking.

Known cutting insert on.with. USSR No. 1611585 and 1495008, cl. In 23 In 27/16, containing for its fastening the base and one or more side bearing surfaces.

The disadvantage of this insert is insufficient in some cases, the reliability of its fastening in the housing socket.

The objective of the invention is the elimination of this disadvantage, i.e. improving the reliability of fixing the cutting insert in the socket of the cutting tool body with a self-clamping mounting mechanism.

To achieve this goal, support ribbons are made on the side surface or lateral surfaces of the cutting insert, located at an angle to its base, and the apex of the ribbon inclination angle is located on the side of the direction of movement of the cutting insert when it is clamped;

- it is equipped with one ribbon;

- it is equipped with several ribbons;

- ribbons are made to its full or not to its full height;

- the edge of the ribbon or ribbons is located below its top or tops;

- the width of the tape along the blade is made larger maximum cutting depth;

- an additional ribbon is made along the blade;

- the height of the supporting wall of the housing is made equal to or less than the difference between the height of the cutting plate and the width of the additional ribbon along the blade;

- ribbons of the arc supporting surfaces are made screw;

- the depth of the recesses next to the ribbons is made variable along their length.

This design of the cutting insert provides an increase in the reliability of its fastening in the housing socket due to compression by friction forces to the base of the housing socket, and in the presence of a movable or pivoting element thereto and then to the base of the housing socket.

The invention is illustrated figa-g, which shows several options for a cutting insert of a developed design located in the housing socket on the movable element.

On figa shows a plan view of the insert and parts of the cutting tool, and figb, c, d shows a cross section of this tool, as well as two types of lateral supporting surface of the cutting insert / in contact with the supporting wall of the housing / and part of the movable element.

The cutting insert of figure 1 is made trihedral / with flat side bearing surfaces /. In the General case, the cutting insert can be made both multifaceted and single-sided, with flat and arc side support surfaces / cm. the two mentioned above and others testimonial. and patents.

The base of the cutting insert can be located both on the base of the housing socket and on the movable / FIG. 1a, b / or rotary elements / in FIG. not shown.

The movable tool element is provided with a groove in which the protrusion of the housing is located. The groove of the movable element and the protrusion of the housing are located at an angle φ to the supporting wall of the housing / Fig.1a/.

Supporting ribbons are made on the lateral surfaces of the cutting inserts (Fig. 1c, g), along which contact with the supporting wall of the body occurs, due to the fact that recesses are made next to the ribbons.

Support tapes are located at an angle φ _p to the base of the cutting plate and a width f.

When clamping, a cutting insert with a movable element moves to the right / speed ϑ _s , figv, g /, in the same place, i.e. on the right, there are also the vertices of the angle of inclination of the ribbons.

The cutting insert can be equipped with one / fig.1v / or several ribbons / fig.1g/ on its lateral supporting surfaces.

The height of the cutting insert h _p and the height of the supporting wall h _{c /} Fig.1b/.

Ribbons can be made both on the entire height of the plate / Fig. 1//, and not on the entire height of its plate / Fig. 1//.

The edge of the ribbon can be located below the top by a value of h _{in /} Fig. 1// to improve the geometry of the cutting part.

The width of the tape along the blade / cutting / f _{l is} made greater than the maximum cutting depth t, i.e. f _l > t / Fig. 1a, in /. Along the blades of the cutting insert, an additional ribbon of width f _{d /} FIG. 1 _g / can be made. Both that, and another also for improvement of geometry of the cutting part.

The height of the supporting wall of the housing in the presence of an additional ribbon can be made equal to or less than the difference between the height of the cutting insert and the width of the additional ribbon, i.e. h _c ≤h _p -f _d .

For cutting inserts with arched lateral supporting surfaces / cm. A.S. No. 1495008 and others / ribbons are screw / not shown in figure 1 /.

The depth of understatement of the side surfaces of the plates next to the ribbons can be in the range from a few microns to 0.1 mm or more, and also be variable in their length / ribbons /.

Inclined ribbons on the lateral supporting surfaces of the cutting inserts can be obtained, for example, by spraying wear-resistant coatings or grinding the recesses / between them /.

The clamping of the cutting insert in the socket of the tool body is carried out by applying a force P _{s /} Fig.1a/. In this case, all parts of the tool are jammed in the housing socket.

When clamping, the cutting insert together with the movable element moves to the right in the direction of speed ϑ _s , and opposite friction forces F _s appear on the ribbons, additionally pressing the plate to the base / Fig. 1c, g /.

The expansion of the cutting insert is carried out by applying a force P _p .

The cutting tool moves when working with the feed S / Fig.1a/.

The pressing of the cutting insert to the base of the housing socket is enhanced if, after clamping it, there are not only elastic, but also small plastic deformations of the supporting wall of the housing (the hardness of which is always lower than the hardness of the cutting insert).

Claims (10)

1. A cutting insert having, for fixing it in a housing socket, a base and one or more lateral supporting surfaces, characterized in that said ribbing is provided with supporting ribbons arranged at an angle to the base, the apex of the angle of inclination of the ribbons being located on the side of the direction of movement cutting plate when it is clamped. 2. The cutting insert according to claim 1, characterized in that it has one ribbon on each side of the supporting surface. 3. The cutting insert according to claim 1, characterized in that it has several ribbons on each side of the supporting surface. 4. The cutting insert according to claim 1, characterized in that the ribbons are located along all or not all of its height. 5. The cutting insert according to claim 1, characterized in that the edge of the ribbon or ribbons is located below the top or tops of the cutting insert. 6. The cutting insert according to claim 1, characterized in that the width of the tape along the blade is made greater than the maximum cutting depth. 7. The cutting insert according to claim 1, characterized in that an additional ribbon is made along the blade. 8. The cutting insert according to claim 7, characterized in that it is designed to interact with the supporting wall of the housing having a height equal to or less than the difference between the height of the cutting plate and the width of the additional ribbon along the blade. 9. The cutting insert according to claim 1, characterized in that the lateral supporting surfaces are made of arc, and the ribbons located on them are screw. 10. The cutting insert according to claim 1, characterized in that the depth of the recesses next to the ribbons is made variable along their length.