CS236991B1 - Boaring head for drilling of long holes - Google Patents

Abstract

The purpose of the invention is to adjust the diameter boring heads, thereby achieving considerable cost savings and loss times. This purpose is achieved by the solution according to the invention of the invention, consisting of a body (1) provided a groove (4) for receiving the carrier (5), which is provided on the outer side a recess for a cutting tool holder (10) boring plates (15) where v a recess is provided on the opposite side for inserting a washer (12) provided with an opening for passing the clamping screw (15); which connects the carrier (5) to the body (1). The lower lower part of the carrier (5) is provided with i a projection for capturing axial forces, i with the gross adjustability of the average with the washer (12) and fine adjustment two adjusting radial screws (14).

Description

The purpose of the invention is to adjust the diameter of the boring head, thereby achieving considerable savings in acquisition costs and loss times.

This object is achieved by a solution according to the invention, comprising a body (1) provided with a groove (4) for receiving a support (5), which is provided on the outside with a recess for a knife holder (10) of a cutting insert (15) for boring. a recess is formed in the opposite side for receiving the washer (12) provided with an opening for the passage of the clamping screw (15) _; connecting the carrier (5) to the body (1).

The rear lower part of the carrier (5) is also provided with a projection for absorbing axial forces, although the coarse adjustability of the diameter is performed by a washer (12) and fine adjustment by two adjusting radial screws (14).

Giant. $

236 991

236 991

The invention relates to a design of a boring head for boring long holes of larger diameters, in particular on horizontal boring machines.

For boring long holes, especially diameters larger than one hundred millimeter. Various designs of boring heads _f are known in the boring machines depending on the boring technology used, the machine design and its equipment. They are usually fitted with tools whose active parts are made of high-speed steel and have guides around their circumference *

wood or plastic, for example textite. Special designs of boring heads are also known, but these are contemplated by modern boring machines with accessories and which consist of a head body having several recesses on its face or circumference in various designs for exchangeable carriers with insert holders of different profiles, in particular triangular and square and wherein the head body is provided on its circumference with hard metal guides, such as cemented carbides.

The disadvantage of said boring heads is that they are not adjustable in diameter and that a new boring head including a boring bush must be used for each diameter. Because their purchase price is considerable, their use is economical only for larger serifs and considering their high productivity. The disadvantage is also the loss times, which arise when replacing the tool and boring bushes.

The above-mentioned disadvantages are overcome by the boring head for boring long holes according to the invention, consisting of a body which has at least two guides and at least one guide on its periphery.

2 236 991 an open groove for receiving a carrier of at least one knife holder which is connected to the boring head body by a clamping screw. The outer knife holder of the outer carrier is connected thereto

provided with a clamping screw and provided with two adjusting radial screws and a clamping screw connected to the insert holder retained in the cutter holder recess, wherein the carrier is on the outer side, provided with a cutter holder for the cutter holder, where opposite a recess is provided for inserting a washer provided with an opening for the passage of the clamping screw and wherein the rear lower portion of the carrier is provided with a projection for absorbing axial forces.

The advantage of the boring head according to the inventions is that it allows its diameter to be adjustable by up to twenty-five millimeters above its basic diameter, thereby significantly reducing the number of boring heads and boring bushes, thereby achieving considerable cost savings and cost savings. would arise in their replacement. Another advantage is that the final drilling of the pre-drilled hole does not damage it by the guide, as this final machining is performed by pulling the tool during retraction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view of the boring head, taken along a cutting plane AA provided with guides and an outer open groove for insert carriers with at least one knife holder; FIG. Fig. 3 shows a boring head carrier for boring and Fig. 4 shows a side view of Fig. 3.

The boring head for boring long holes according to an exemplary embodiment consists of a body 1, which is provided on its circumference with two cemented carbide guides 2 and one textile guide and one open groove 6 for receiving an external carrier 2 where the other open groove is inserted an inner carrier 6, fastened by a clamping screw χ, provided with two knife holders 8 fixed to its carrier 6 by unmarked clamping screws, wherein the cutting inserts are received in a recess of the knife holders 8 and fastened by a screw through their retainer. The outer carrier 2 is from the outer side of the side

236 991, 3 provided with a recess for a knife holder 10 fixed by a clamping screw 11. wherein a recess is formed in the opposite side for inserting a washer 12 provided with an opening, as well as a carrier 5 in its lower part for passing the clamping screw 13 '. this opening is provided with a recess from the outside for the head of the clamping screw 13 to which it is connected 8 by the body 1. The rear lower part of the carrier 5 is provided with a projection 18 to absorb axial forces engaging in the recesses in the boring head body.

After the boring head is mounted on an unmarked boring pipe which is provided; the outer and the body 1 of the boring head internal thread _of making a first drilling a hole boring head which is provided with one, not shown outside carrier two knife holders provided with cutting inserts inserted into the open slot £ and fixed with clamping screw 13 and the second inner carrier 6, two knife holders 8 After the drilling has been carried out, the clamping screw 11 is loosened and the unmarked outer knife holder carrier is removed and the boring head is returned to its initial position. Instead of the removed external knife holder carrier, the carrier 5 with the knife holder 10 of the final cutting bore 15 is inserted into the open groove 4, with a washer 12 for roughly adjusting the desired diameter between the carrier 5 ^and the body. 1 of the boring head and make a fine adjustment by adjusting radial screws 14 of the knife holder 10 to the required diameter. After this adjustment, the carrier 5 from the boring head, after loosening the clamping screw 13, is removed and the boring head is moved to the end of the through hole, where the carrier 5 is inserted into the open groove 4 and fastened by the clamping screw 13 and then by pulling the tool during retraction. rotates j the final hole is made according to the workshop drawing. If we are to make a hole with a different diameter that is within twenty-five millimeters above the diameter of the boring head, use the same boring head, but replace only the washer 12 for coarse adjustment and fine-tuning again by adjusting the set screws 14. These washers 12 we can produce different thicknesses depending on the need to drill hole diameters.

Claims (1)

Object of the invention 236 991 Boring head for boring long holes, consisting of a body which is provided with at least two guides and at least one open groove for receiving the carrier of at least one knife holder connected to the boring head body by a tensioning screw, wherein the outer knife holder of the outer carrier is and with two set radial screws and a clamping screw connected to a cutting plate holder mounted in a cutter holder recess, characterized in that the carrier (5) on the outer side has a recess for the cutter holder (10) where in the opposite side a recess is provided for receiving a washer (12) provided with an opening for the passage of the clamping screw (13) and wherein the rear lower portion of the carrier (5) is provided with a projection (18) to accommodate axial forces.