RU82608U1 - MILL DRILL - Google Patents

Abstract

A drill-mill comprising a housing, cutting inserts located in the housings of the housing and secured with fastening parts, at least one of which is placed with the center overlapping, characterized in that it contains two types of inserts: end-cylindrical milling inserts placed on peripherals, and drilling inserts with the shape of W (“broken triangle”), end cutting edges of these inserts in the projection on the axial plane form a zigzag line consisting of straight and curved sections.

Description

The utility model relates to mechanical engineering and can be used for machining parts, namely the milling of grooves or pockets with preliminary drilling.

A known construction of a whole keyway cutter containing a housing, teeth made on it with deep straight or inclined grooves and an increased core diameter, the teeth contain end cutting edges, one of which is located with the center overlapping (D.V. Kozhevnikov, V.A. Grechishnikov, Kirsanov S.V. et al. Cutting tool: Textbook for high schools / Edited by S. V. Kirsanov. - 2nd ed. Add. M: Mechanical Engineering, 2005, pp. 179, 180;

Mitsubishi General Catalog 2007-2009: Turning tools. Rotating tool. Tooling systems, pp. B014 ... B160).

The disadvantage of these mills is the small diameter, usually up to 20 mm. The processing of keyways of greater width by such mills is carried out in several passes.

Also known is the design of the drill-cutter, selected as the closest analogue and containing the body, cutting inserts placed in the housings and secured with fasteners, at least one of which is placed with the center overlapping, the plates are mainly rectangular in shape, and are located with the larger side placed at the end of one plate and at the periphery of the other (Mitsubishi, general catalog 2007-2009: Turning tools. Rotary tools. Tool systems, pages C108 ... C111).

The milling drill allows preliminary drilling with axial feed, after which the groove or pocket is machined with the feed perpendicular to the axis of the cutter.

The disadvantage of this design is the unsatisfactory conditions of crushing chips during drilling. Chip removal is carried out by a long straight cutting edge at the end, which leads to the formation of chips of considerable length and the deterioration of its removal from the cutting zone.

The technical problem to which the utility model is directed is to improve the conditions for crushing chips and their removal from the cutting zone, by giving its cross section a complex zigzag shape.

This problem is solved in that the mill drill containing the housing, cutting inserts placed in the housings and secured with fasteners, at least one of which is placed with the center overlapping, contains two types of inserts: end-cylindrical milling inserts, placed on the periphery and drilling inserts with the shape of W ("broken triangle"), the end cutting edges of these inserts in the projection onto the axial plane form a zigzag line consisting of straight and curved sections.

For this example, the following inserts were selected: Sandvik Coromant R390-180612M-PM milling insert; Sandvik Coromant WCMX 080412 drill plate.

The implementation of a drill-cutter with two types of plates: end-cylindrical milling plates located on the periphery and drilling plates with a shape of W (“broken triangle”), in combination with the formation of the cutting edges by the cutting edges in the projection onto the axial plane of a zigzag line, consisting of straight and curved sections will allow you to split the chips in width, since each plate removes the chips with its end edge and give the cross-section of the chips a broken shape. Chips with this sectional shape curl worse, which leads to its crushing into sections of a certain length.

The applicant does not know the drill-drill with the specified set of essential features and the claimed combination of essential features does not follow explicitly from the current level of technology, which confirms the conformity of the claimed technical solution to the condition of "novelty."

The claimed technical solution is illustrated by drawings, where:

figure 1 - mill drill (General view);

figure 2 - a view of figure 1;

figure 3 - view B in figure 2;

4 is a view In figure 2;

5 is a projection of the cutting edges on the axial plane;

6 is a workpiece at the end of the drilling;

7 is a diagram of the removal of allowance during drilling.

The drill-mill comprises a housing 1 and cutting inserts 2 located in the housings 3 of the housing and secured with fasteners 4. At least one of the inserts 2 is placed with the center overlapping. Plates 2 are made of two types: end-cylindrical milling plates 5 located on the periphery and drilling plates 6 with a shape of W ("broken triangle"). End cutting edges 7 of these inserts in the projection onto the axial plane form a zigzag line 8, consisting of straight and curved sections.

The process of the drill-mill is as follows. The milling drill is placed in the spindle of the milling machine. The workpiece is fixed on the machine table in a clamping device. The tool is brought to its original position and includes the main cutting movement - the rotation of the tool. After that, the tool or the workpiece is informed of the axial movement of the feed to the depth of the machined groove. While the end cutting edges of the plates 2 remove the stock in the form of chips. The location of the cutting edges in the form of a zigzag line provides a good crushing of the chips in width and length and its removal from the cutting zone. After drilling on

the required depth of the axial feed is turned off. The bottom of the treated surface in cross section will have a zigzag shape. Further processing is carried out with the feed perpendicular to the axis of the tool. When moving the cutter-drill relative to the workpiece by the diameter value, all zigzag irregularities of the bottom will be eliminated. After processing the groove or pocket, the workpiece is removed.

The drill-mill can be manufactured on standard equipment using well-known materials and modern tools, which meets the criterion of "industrial applicability".

Claims (1)

A drill-mill comprising a housing, cutting inserts located in the housings of the housing and secured with fastening parts, at least one of which is placed with the center overlapping, characterized in that it contains two types of inserts: end-cylindrical milling inserts placed on peripherals, and drilling inserts with the shape of W (“broken triangle”), end cutting edges of these inserts in the projection on the axial plane form a zigzag line consisting of straight and curved sections.