RU2511152C1 - Replaceable double-sided cutting plate and cutting tool - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: replaceable double-sided cutting plate in the form of a polyhedron or a circle and is designed for installation and fixation of a cutting tool in the seat, is limited by upper and lower surfaces and a side surface arranged between them, and has support surfaces accordingly facing upwards and downwards, side support surfaces, cutting edges, arranged on the crossing of the upper and lower surfaces with the side surface, and a through hole, limited by the side surface with an axis that matches the axis of the rotary symmetry. The through hole is made with a cross section in the form of a polyhedron. At the same time on the side surface of the through hole symmetrically relative to the middle plane perpendicular to the axis of rotary symmetry there is a rib. At the same time the specified side support surfaces are arranged on the side surface of the through hole, and support surfaces facing upwards and downwards - on side surfaces of the specified rib.

EFFECT: increased strength of a cutting plate in the zone of a cutting wedge.

3 cl, 9 dwg

Description

The invention relates to the field of processing materials by cutting, in particular to a precast cutting tool in the form of cutters, reamers or mills with mechanical fastening of the cutting inserts.

Known interchangeable double-sided cutting insert in the form of a polyhedron or circle, designed for installation and fixing in the socket of the cutting tool, bounded by the upper and lower surfaces and the lateral surface located between them and having respectively facing up and down supporting surfaces, side supporting surfaces, cutting edges located at the intersection of the upper and lower surfaces with the side surface, and a through hole bounded by the side surface with an axis coinciding with the axis of rotation oh symmetry (see. the international application WO 2011/001939, B23B 27/14, 2011) / 1 /.

Also known is a cutting tool (see / 1 /), comprising a housing having at least one socket in which the cutting insert described above is mounted and fastened with a fixing screw.

The performance of the known interchangeable double-sided cutting insert and the combined cutting tool equipped with such inserts is limited by the strength of the cutting wedge located between the front and rear surfaces. The objective of the invention is to increase the productivity of the cutting insert and the cutting tool in terms of increasing the feed and cutting depth by increasing the strength of the cutting insert in the area of the cutting wedge.

The problem is solved in that in a removable double-sided cutting insert in the form of a polyhedron or a circle, designed to be installed and fixed in the socket of the cutting tool, bounded by the upper and lower surfaces and the side surface located between them and having the supporting surfaces facing respectively up and down, the side supporting surfaces, cutting edges located at the intersection of the upper and lower surfaces with the side surface, and a through hole bounded by the side surface with In accordance with the invention, the through hole is made with a cross-section in the form of a polygon, with a rib located on the side surface of the through hole symmetrically with respect to the middle plane perpendicular to the axis of rotational symmetry, wherein said lateral supporting surfaces are located on the side surface of the through hole, and the supporting surfaces facing up and down on the side surfaces of said rib.

The problem is also solved by the fact that in a cutting tool containing a housing having at least one socket, in which a removable double-sided cutting insert according to claim 1 is installed and fastened with a fixing screw, according to the invention, a protrusion is made in the socket or in each socket a transverse groove having side support walls for interacting with side support surfaces of said cutting insert and a lower support wall on a lower side surface of the transverse groove for alternating interaction facing up and down said support surfaces of the cutting insert.

The proposed interchangeable double-sided cutting insert and cutting tool are shown in figures 1-9, in which:

figure 1 presents a front view of a removable double-sided cutting insert in the form of a polyhedron;

figure 2 presents a top view of the cutting insert in figure 1;

figure 3 presents a section aa in figure 2;

figure 4 presents a front view of a removable double-sided cutting insert in the shape of a circle;

figure 5 presents a top view of the cutting insert in figure 4;

figure 6 presents a top view of the socket precast cutting tool with a cutting insert installed in it;

in Fig.7 presents a view of B in Fig.6;

on Fig presents section bb in Fig.6;

figure 9 presents the cross section GG and DD in Fig.6.

A replaceable double-sided cutting insert in the form of a polyhedron (see Figs. 1-3) or a circle (see Figs. 4, 5) is intended for installation and fixing in the socket of the cutting tool, is limited by the upper 1 and lower 2 surfaces and the side surface located between them 3 and has an axis of rotational symmetry 4, supporting surfaces facing up and down, side supporting surfaces, cutting edges 5, located at the intersection of the upper and lower surfaces with the side surface, and a through hole bounded by the side surface w with the axis coinciding with the axis of rotational symmetry.

The through hole is made with a cross-section in the shape of a polygon, while on the side surface of the through hole symmetrically relative to the middle plane 6, perpendicular to the axis of rotational symmetry 4, there is a rib 7. Moreover, the said lateral supporting surfaces 8 are located on the side surface of the through hole, and facing up and down, supporting surfaces 9, 10 on the side surfaces of said rib.

The cutting tool comprises a housing 11 having at least one socket in which a removable double-sided cutting insert shown in FIGS. 1-6 is mounted with a fastening screw 12 having a head 13 and a fastening element 14. In this case, a protrusion 15 with a transverse groove is made in the socket or in each socket, having side support walls 16 for interacting with the side support surfaces of said cutting insert and a lower support wall 17 on the lower side surface of the transverse groove for alternately interacting with the support surfaces facing up and down 9, 10 of said cutting insert.

The fastener 14 has two 18, 19 elastically connected parts with a dovetail cross-section with a bevel 20 at one end designed to interact with the head of the fixing screw, and with a protrusion 21 at the opposite end, designed to interact with the side surface of the interchangeable double-sided cutting plates.

When blunting the cutting edges from one surface of the cutting insert, for example, the upper 1, which corresponds to the downwardly facing supporting surface 10, it is turned over in the seat. In this case, the cutting edges on the surface 2 become workers, and the upwardly supporting surface 9 interacts with the lower supporting wall 17 of the housing 11.

The implementation of the supporting walls 16 for the insert on the protrusion 15 of the socket allows you to reduce tensile stresses in the cutting wedge and, accordingly, increase its strength, which in turn allows you to increase the processing conditions in terms of depth of cut and feed and, accordingly, increase processing productivity.

In addition, the side support walls 16 of the socket and the lower support surface 17 of the grooves are open on the housing 11 with the possibility of high-precision machining, such as grinding, which increases the accuracy of the cutting tool, in particular multi-blade.

Claims (3)

1. A replaceable double-sided cutting insert in the form of a polyhedron or a circle, designed to be installed and secured in the cutting tool socket, bounded by the upper and lower surfaces and the lateral surface located between them and having an axis of rotational symmetry, supporting surfaces facing up and down, side supporting surfaces, respectively , the cutting edges located at the intersection of the upper and lower surfaces with the side surface, and the through hole bounded by the side surface with the axis, coincide with an axis of rotational symmetry, characterized in that the through hole is made with a cross section in the form of a polygon, while on the side surface of the through hole symmetrically relative to the middle plane perpendicular to the axis of rotational symmetry, there is a rib, while the said lateral supporting surfaces are located on the side surface through holes, and supporting surfaces facing up and down on the side surfaces of said rib. 2. A cutting tool comprising a housing having at least one socket in which a replaceable double-sided cutting insert according to claim 1 is mounted using a fastening screw having a head and a fastening element, wherein a protrusion is made in the socket or in each socket with a transverse groove having side support walls for interacting with side support surfaces of said cutting insert and a lower support wall on a lower side surface of the transverse groove for alternately interacting with facing x and down said support surfaces of the cutting insert. 3. The cutting tool in which the fastener has two elastically connected parts with a cross section in the form of a dovetail with a bevel at one end, designed to interact with the head of the fixing screw, and with a protrusion at the opposite end, designed to interact with the side surface interchangeable double-sided cutting insert.

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