RU2326755C1 - Prefabricated drill - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: drill is intended for materials processing with cutting, is related to prefabricated cutting instrument and consists of cutting head, which is coaxially installed in the casing and is equipped with grooves for chips removal that pass to grooves for casing chips removal. At that the casing has channels for supply of lubricant cooling liquid (LCL) and elastic bulges for fixation of cutting head. In the casing there are support bulges installed mainly along the drill axis for interaction with corresponding embracing slots that are arranged in the cutting head. Casing channels for supply of LCL pass through the mentioned support bulges. At that on the cutting head there are bulges for interaction with elastic bulges of casing, which are installed with the possibility of cutting head tightening to casing support bulges.

EFFECT: expansion of technological possibilities.

3 dwg

Description

The invention relates to the field of processing materials by cutting, a prefabricated cutting tool for processing holes.

There is a prefabricated drill bit containing a cutting head coaxially mounted on the body and having grooves for removing chips, turning into grooves for removing chips from the body, while the body has channels for supplying cutting fluid (coolant) and elastic protrusions for securing the cutting head (see WO 2005115667, B23B 51/02, 2005).

In the known prefabricated drill, the housing base surfaces are placed on elastically deformable protrusions, which places high demands on the symmetry of the cutting forces applied to the cutting edges of the drill.

The objective of the invention is to expand technological capabilities, by reducing the sensitivity to imbalance of the cutting forces acting on the cutting edges of the drill (cutting head).

The problem is solved in that in an assembly drill containing a cutting head, coaxially mounted on the body and having grooves for removing chips, turning into grooves for removing chips from the body, while the body has channels for supplying cutting fluid (coolant) and elastic protrusions for securing the cutting head, according to the invention on the body are made located mainly along the axis of the drill supporting protrusions for interaction with the corresponding covering grooves made on the cutting head, and the channels casings for supplying coolant pass through the said support protrusions, while protrusions are made on the cutting head for interacting with elastic protrusions of the housing arranged to press the cutting head against the supporting protrusions of the housing.

The proposed precast drill is presented in figures 1-3, in which:

figure 1 shows an end view of a precast drill;

figure 2 shows a view of figure 1;

figure 3 shows a view of B in figure 1.

The assembly drill comprises a cutting head 1 coaxially mounted on the housing 2 and having grooves for removing the chips 3, turning into grooves for removing chips 4 of the housing. The housing 2 has a shank (not shown), channels 5 for supplying a cutting fluid (coolant) and elastic protrusions 6 for securing the cutting head 1.

Supporting protrusions 7 located mainly along the axis of the drill are made on the housing 2 for interaction with the corresponding grooves 8 covering them, made on the cutting head 1. The protrusions 7 are designed to base the cutting head 1 and transmit torque. The location of the base surfaces of the housing on the rigidly connected protrusions 7 reduces the sensitivity of the reliability of fixing the cutting head 1 to the uneven cutting forces applied to its cutting edges 9, which in turn allows you to expand the technological capabilities of the drill.

The channels 5 of the housing 2 for supplying coolant pass through the support projections 7, which allows to improve cooling of the base surfaces of the housing and increase their contact stiffness.

On the cutting head 1, protrusions 10 are made for interacting with the elastic protrusions 6 of the housing 2, which are located with the possibility of pressing the cutting head to the supporting protrusions 7.

When fixed to the housing 2, the grooves 8 of the cutting head 1 are aligned with the protrusions 7 and then the cutting head is displaced along the axis to the stop in the axial bearing surface 11 of the housing. In this case, the protrusions 10 of the head are tightened into the grooves 12, forming elastic protrusions 6 of the housing. The protrusions 6 are elastically deformed and press the cutting head to the supporting protrusions 7 of the housing.

To unfasten the cutting head, a special key (not shown) is inserted into the hole 13 made in the housing 2 and rotated to push the protrusions 10 of the cutting head 1 from the grooves 12.

Claims (1)

An assembly drill containing a cutting head coaxially mounted on the housing and having grooves for removing chips, passing into the grooves of the housing for removing chips, while the housing has channels for supplying a cutting fluid (coolant) and elastic protrusions for securing the cutting head, characterized in that on the body are made located mainly along the axis of the drill supporting protrusions for interaction with the corresponding covering grooves made on the cutting head, and the channels of the body for supplying coolant pass through the aforementioned support arms, and the cutter head provided with protrusions for interacting with the resilient protrusions housing arranged to urge the cutting head to the support arms of the housing.

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