RU216421U1 - Interchangeable core drill - Google Patents

Abstract

The utility model relates to the field of metal cutting and can be used in the processing of metals prone to hardening on machine tools with different rigidity of the technological system. The device contains a hollow body with a cutting part and a shank. In the sockets of the chip grooves of the cutting part, cutting inserts are fixed, the cutting edges of which are made with a different inclination angle λ _{s of} the cutting edge and with a lead angle of 25°. The cutting inserts are installed from the condition of cutting the work-hardened layer formed during processing by each cutting insert. Vibrations are reduced during processing, the resistance of the annular drill is increased. 6 ill.

Description

The utility model relates to the field of metal cutting and can be used in the processing of metals with a high work hardening capacity when processing products on machine tools with both high and low rigidity of the technological system.

State of the art

Known ring drill (patent RU 2433891 publ. of the cutting insert is configured to cut the inner circumferential side portion, and the remaining inserts serving as the outer cutting inserts are configured to cut the outer circumferential side portion.

, что приводит к увеличению наклепанного слоя.The disadvantage of this design is that the inserts are located in the body with the same angle of inclination of the cutting edge.

, which leads to an increase in the hardened layer.

Also known hole drill (patent RU 2333818 publ.20.09.2008), containing a hollow body with a cutting part and a shank. The cutting part has cutting teeth and chip evacuation grooves that merge into the chip evacuation grooves of the hollow body.

, который представляет собой угол между режущей кромкой пластины и обрабатываемой поверхностью, что не позволяет кольцевому сверлу самоцентрироваться в момент засверливания, а также у кольцевого сверла с нулевым углом в плане длина активной режущей кромки в момент засверливания больше, чем у сверла, имеющего угол в плане, что приводит к появлению вибрации и выкрашиванию режущей кромки.The disadvantage of this design is that the teeth have a zero lead angle.

, which is the angle between the cutting edge of the insert and the surface to be machined, which does not allow the core drill to self-center at the time of drilling, and for the core drill with a zero entering angle, the length of the active cutting edge at the moment of drilling is greater than that of a drill with an angle of entry , which leads to vibration and chipping of the cutting edge.

Disclosure of the essence of the utility model

The objective of the present utility model is to provide an interchangeable core drill capable of working in metals with a high work hardening capacity.

The technical result is to reduce vibration and increase the reliability of the device.

The specified technical result is solved with the help of a structure containing a hollow body with a cutting part having cutting teeth and chip grooves, and a shank; of the cutting edge of the plates 5 is -4°, and the angle of inclination of the cutting edge of the plates 6 is 13°, while the angle of inclination of the cutting edges is set from the condition of cutting the work-hardened layer, the work-hardened layer created by the plate 5 is cut off by the plate 6, and the work-hardened layer created by the plate 6 is cut off by plate 5, the lead angle is 25°.

Brief description of the drawings

The proposed hole drill is shown in Fig.1-6, in which:

in fig. 1 shows a general view of the inventive annular drill with replaceable cutting inserts;

in fig. 2 shows view A showing the radial rake angles;

in fig. 3 and 4 show views B and C showing the axial rake angles;

in fig. 5 shows view D, which shows the angles in the plan and the angles of inclination of the cutting edge;

in fig. 6 shows view D, which shows the angles in the lead and the angles of inclination of the cutting edge.

Implementation of the utility model

, хвостовик 7 и канал для подачи смазывающе-охлаждающей жидкости 8 со стороны торца хвостовика.The annular drill contains a body 1 divided by chip grooves 2 and sockets 3 located in them, in which replaceable cutting inserts 5 and 6 are fixed with screws 4, the cutting edges of which have a different angle of inclination of the cutting edge to the velocity vector

, shank 7 and a channel for supplying lubricating-cooling liquid 8 from the end of the shank.

у обеих пластин позволяет ему самоцентрироваться, тем самым пропадает необходимость устанавливать центральное сверло, ширина реза при этом минимальна. При дальнейшем погружении режущих пластин в металл увеличивается нагрев и металл начинает наклепываться. За счет того, что пластины имеют разный угол наклона режущей кромки, наклепанный слой, созданный пластиной 5, срезается пластиной 6, а наклепанный слой, созданный пластиной 6, срезается пластиной 5. Works ring drill as follows. Lead angle

on both inserts allows it to self-center, thereby eliminating the need to install a central drill, while the cutting width is minimal. With further immersion of the cutting inserts into the metal, the heating increases and the metal begins to be riveted. Due to the fact that the plates have a different angle of inclination of the cutting edge, the work-hardened layer created by the plate 5 is cut off by the plate 6, and the work-hardened layer created by the plate 6 is cut off by the plate 5.

Also, due to the different angle of inclination of the cutting edge of the inserts 5 and 6, chip separation and chip breaking are improved. Due to the small width of the cut and, as a result, the small volume of the cut metal, the heating in the chip formation zone is reduced, which in turn reduces the size of the work-hardened layer.

The use of the utility model reduces vibration, increases the resistance of the cutting edge of the insert to chipping.

The claimed utility model has a set of essential features previously unknown from the prior art. The presence of new distinctive essential features indicates the compliance of the claimed utility model with the criterion of patentability "novelty".

The claimed utility model can be made from known materials using known means, which indicates the compliance of the claimed utility model with the patentability criterion "industrial applicability".

Claims (1)

An annular drill with interchangeable cutting inserts, containing a shank and a hollow body with a cutting part having cutting inserts and chip grooves, characterized in that cutting inserts (5) and (6) are fixed with screws in the nests of the chip grooves, the cutting edges of which are made with excellent friendliness. from the other by the angle of inclination λ _s and the angle in terms of 25°, while the angle of inclination of the cutting edge of the inserts (5) is equal to -4°, and the angle of inclination of the cutting edge of the inserts (6) is 13°, while the cutting inserts (5) and ( 6) are installed so that the hardened layer created by the plate (5) is cut off by the plate (6), and the hardened layer created by the plate (6) is sheared off by the plate (5).

Images