RU2578274C1 - Assembled drill - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to machine building and can be used in machining materials by composite drill bits with mechanical attachment of cutting plates. Assembled drill comprises body with stem with lengthwise axis aligned with drill axis, chip removal flutes and seats are installed and fixed by fastening screws identical peripheral cutting plate and central cutting plate, each of which is limited by end surfaces in form of polygons and side surface. In one seat with central cutting plate there is additional cutting plate, which is made from material strength exceeding strength of central and peripheral cutting plates, has fastening part and at least one cutting part and is limited by at least one base surface for interaction with base body seat thrust wall for installation of central cutting plate, first side bearing surface for interaction with side supporting wall of said body seat second lateral bearing surface for interaction with additional thrust wall made in said body seat, and at least one fastening surface on attachment part for interaction with side surface of central cutting plate.

EFFECT: higher efficiency due to possibility of operation with increased drill feed.

3 cl, 12 dwg

Description

The invention relates to the field of processing materials by cutting, in particular to prefabricated drills with mechanical fastening of cutting inserts.

An assembly drill is known, comprising a housing with a shank having a longitudinal axis coinciding with the axis of the drill, chip grooves and sockets in which identical peripheral cutting insert and central cutting insert are installed and secured with fastening screws, each of which is bounded by end surfaces in the shape of polygons and a side surface located between them, with the central cutting insert located closer to the axis of the body than the peripheral cutting insert, with each ogre socket icheno base support wall and the side support walls (see. AS USSR 173093, V23V 27 / 02b 1973) / 1 /.

In the known drill / 1 /, one of the most loaded is the portion of the cutting edge adjacent to the axis of the housing. This section is characterized by a low cutting speed. The objective of the invention is to increase the longitudinal feed of the drill by placing on the specified section of the cutting edge of the additional cutting insert made of a more durable material than the Central and peripheral cutting inserts.

The problem is solved in that in an assembly drill containing a body with a shank having a longitudinal axis coinciding with the axis of the drill, grooves for chip evacuation and nests, in which identical peripheral cutting insert and central cutting insert are installed and fixed with fastening screws, each of which it is limited by end surfaces in the form of polygons and a side surface located between them, with the Central cutting insert located closer to the axis of the housing than the peripheral cutting insert and, in this case, each nest is bounded by a base support wall and side support walls, according to the invention it is provided with an additional cutting insert made of a stronger material than the central and peripheral cutting inserts installed in one socket with a central cutting insert between it and the axis of the housing having a mounting part and at least one cutting part and limited by at least one base surface for interacting with the base support wall of the housing socket in which it is installed a central cutting insert, with a first lateral supporting surface for interacting with a side supporting wall of a housing socket in which the central cutting insert is mounted, a second lateral supporting surface for interacting with an additional supporting wall made in said housing socket, and at least one mounting surface located on the mounting part and designed to interact with the side surface of the Central cutting plate.

The problem is also solved by the fact that in the corners of the polygons of the Central and peripheral cutting inserts are made rectangular cutouts.

The problem is also solved by the fact that the additional cutting insert is made with two base surfaces for alternately interacting with the base support wall of the socket in which the central cutting insert is mounted, and two mounting surfaces for alternating engagement with the side surface of the central cutting insert.

The proposed precast drill is shown in FIG. 1-12, on which:

in FIG. 1 is a side view of a precast drill;

in FIG. 2 is a left view of FIG. one;

in FIG. 3 is a view A of FIG. 2;

in FIG. 4 shows a section bB in FIG. 1;

in FIG. 5 shows a section BB in FIG. one;

in FIG. 6 shows a cross section GG in FIG. 3;

in FIG. 7 is a side view of an additional cutting insert;

in FIG. 8 is a top view of FIG. 7;

in FIG. 9 is a left view of FIG. 7;

in FIG. 10 shows a section DD in FIG. 7;

in FIG. 11 is a side view of a central or peripheral cutting insert;

in FIG. 12 is a plan view of FIG. eleven.

The assembly drill comprises a housing 1 with a shank (not shown) having a longitudinal axis 2 coinciding with the axis of the drill, grooves 3 for chip evacuation and slots in which identical peripheral cutting insert 5 and central cutting insert 6 are mounted and secured with fixing screws 4 , each of which is limited by end surfaces in the form of polygons and a side surface located between them, with the central cutting insert 6 located closer to the axis 2 of the housing 1 than the peripheral cutting insert 5. Each socket og An'ichi base support wall and the side support walls.

The assembly drill is equipped with an additional cutting insert 7 made of a stronger material, for example, high-speed steel, than the central and peripheral cutting inserts (usually made of hard alloy), installed in one socket with the central cutting insert 6 between it and the axis 2 of the housing 1. and

The additional cutting insert 7 has a fixing part 8 and at least one cutting part 9 and is limited by at least one base surface 10 for interacting with the base support wall 11 of the housing socket, in which the central cutting insert 6 is mounted, with the first lateral supporting surface 12 for interaction with a side support wall 13 of the housing socket in which the central cutting insert 6 is mounted, a second side support surface 14 for interacting with an additional support wall 15 made in the aforementioned m of the housing 1, and at least one mounting surface 16 located on the mounting part and designed to interact with the side surface 17 of the Central cutting plate.

In the corners of the polygons of the central 6 and peripheral 5 cutting inserts, rectangular cutouts 18 are made.

An additional cutting insert can be made with two base surfaces for alternating engagement with the base support wall of the socket in which the central cutting insert is mounted, and two mounting surfaces for alternating engagement with the side surface of the central cutting insert.

When assembling the drill, the peripheral cutting insert 5 is installed in the housing socket and secured with a fixing screw 4, then an additional cutting insert is installed in the socket for the central plate and the central cutting insert is secured with a fixing screw 4.

The presence of an additional cutting insert in the precast drill working near the axis 2 makes it possible to increase the feed of the drill and thereby increase processing productivity.

Claims (3)

1. An assembly drill comprising a housing with a shank having a longitudinal axis coinciding with the axis of the drill, grooves for chip evacuation and slots in which identical peripheral cutting insert and central cutting insert are installed and secured with fixing screws, each of which is limited by end surfaces in the form of polygons and a side surface located between them, with the central cutting insert located closer to the axis of the body than the peripheral cutting insert, with each socket being bounded a basic support wall and side support walls, characterized in that it is provided with an additional cutting insert made of a material whose strength is greater than the density of the material of the central and peripheral cutting inserts installed in one socket with a central cutting insert between it and the axis of the housing having a mounting part and at least one cutting part, wherein the additional cutting insert is bounded by at least one base surface for engaging with the base support wall of the body socket a whisker in which a central cutting insert is mounted, with a first side supporting surface for interacting with a side supporting wall of a housing socket, in which a central cutting insert is installed, a second side supporting surface for interacting with an additional supporting wall made in said housing socket, and at least one mounting surface located on the mounting part and designed to interact with the side surface of the Central cutting plate. 2. The drill according to claim 1, characterized in that the central and peripheral cutting inserts are made with rectangular cutouts located in the corners of the polygons. 3. The drill according to claim 1, characterized in that the additional cutting insert is made with two base surfaces designed to alternately interact with the base support wall of the socket in which the central cutting insert is mounted, and with two mounting surfaces designed to alternate interaction with the side surface of the central cutting insert.

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