DE1270364B - Boring bar insert for a drill steel - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

Number:
File number:
Registration date:
Display day:

B23b

German class: 49 a - 57

P 12 70 364.9-14
April 19, 1963
June 12, 1968

The invention relates to a drill rod insert for a drill steel, a cylindrical, longitudinally adjustable shaft, which with its rear shaft part by means of a helical compression spring is pressed against an adjusting screw and the front shaft part can be clamped.

In a known drill rod insert of this type designed as a cylindrical collet the front part consists of a collet. For this purpose, the front part of the cartridge case is used Slotted lengthways, with an outer cone and an outer thread, onto which a locking nut can be screwed on, which has an inner cone that cooperates with the cone of the collet having. When screwing on the clamping nut, the slotted collet is pushed through the cone of the Nut pressed together and thus the steel shaft clamped in the collet. It is also one cylindrical collet of this type is known in which the terminal nut is slit longitudinally so that when screwing the clamping nut onto the collet, not only the steel shaft in the collet clamped, but at the same time the clamping nut is spread so that it is thus on the outer circumference is pressed against the bore of the drill rod in which the collet is inserted. These Collet with collet has the disadvantage that only one with collet with a small diameter relatively weak steel shaft with a very small cutting edge can be accommodated, so that for example with a cartridge diameter of 8 mm, the steel shaft diameter is only 3.7 mm.

There are also square clamping cartridges with a collet of the aforementioned type known whose However, production is relatively expensive. With this cartridge, the front part is the square cartridge turned off and the foremost part designed as a collet, with the turned off front part a square sleeve is pushed on and welded to the square cartridge. The one on the collet The screwed-on slotted Kiemnut then engages in the square sleeve, whereby it spreads presses with its circumference against the bore of the square sleeve. Apart from the expensive production this square clamping cartridge with collet has the disadvantage that it is only made in larger dimensions can be, d. H. with square side lengths over 16 mm.

It is also known to use the cutting steel directly in the machining of small bore diameters To install boring bar, so that a cartridge case is omitted. To clamp the Boring bar insert for a drill steel

Applicant:

Robert Breuning, 7122 Besigheim, Hauptstr. 58

Named as inventor:

Robert Breuning, 7122 Besigheim

Steel shaft at the front end is a clamping piece that is inserted into a corresponding recess of the The boring bar is inserted and fastened with a screw. This type of construction has the disadvantage that the Production is relatively expensive, and furthermore the steel shaft with the clamping piece is only one-sided or is only clamped at opposite points and that also by the insertion of the Clamping necessary recess of the drill rod a considerable weakening of the same occurs.

The invention is based on the object of creating a boring bar insert for a turning tool, compared to the one mentioned at the beginning, simpler in structure and manufacture and very small Dimensions can be produced with a relatively strong steel shaft. For this purpose is with one Boring rod insert of the type mentioned according to the invention for clamping the front Shank part a longitudinally slotted, an axial bore for receiving this shaft part and a conical one Head having clamping screw is provided, and the drill rod or one which can be inserted into the drill rod The clamping cartridge has an internal thread for screwing in this clamping screw and an internal cone on which the conical head of the clamping screw engages.

The invention is explained in more detail below on the basis of exemplary embodiments. It shows

F i g. 1 shows a longitudinal section through a square clamping cartridge.

F i g. 2 the plan view of a boring bar with the collet inserted at right angles from FIG. 1,

F i g. 3 shows the front view in direction III of FIG. 2,

F i g. 4 the plan view of a boring bar with a

809 5S9 / 251

Claims (1)

The clamping cartridge of the clamping screw 26, which is inserted at an acute angle, is held. Are beneficial to Fig. 1, opposite sides of the cartridge case 1 flat F i g. 5 the longitudinal section through the cartridge case longitudinal grooves 27 are provided so that the clamping screw of Fig. 1, 26 not in the middle of the ratio at this point F i g. 6 shows a longitudinal section through the clamping 5 moderately weak cartridge case 1 unscrew a pressure of Fig. 1, can practice a deflection and thus a F i g. 7 shows the front view of this clamping screw in the clamping of the thread 9 or the adjusting screw 8 Direction VII of FIG. 6, can effect. Thanks to this flat arrangement F i g. 8 shows a cross section through a boring bar with longitudinal grooves 27, the clamping screw 26 also acts with directly built-in turning tool, io circular arc-shaped pressure points outside the pa- F i g. 9 shows the view in the direction IX of FIG. 8. Tronenmitte, so on relatively thick-walled In the drawing, 1 is a square cartridge parts of the same one, so that the aforementioned disadvantage sleeve denotes, in the bore 2 of which a steel is avoided. Shank 3 is arranged to be longitudinally displaceable, which carries the cutting edge 4 described above and shown. This steel shaft is secured against rotation in the sleeve 1 * 5, which also enables production. For this purpose, one of square cartridges with very small dimensions, transverse pin 5 is provided, the protruding ends of which engage in longitudinal grooves 6 (Fig. 5) of the sleeve 1 cartridge of the steel shaft diameter d relative to the edge length s of the square corresponding to the length of the square. The tapered part 3 α of the steel shaft 3 is moderately large. Thus, in the case of the invention, its conical end 7 is supported on a 2 ° formation or thanks to the arrangement of the clamping adjusting screw 8, which is screwed into the fine thread 9 of the screw 17 in the case of a square cartridge into which a cannula 1 is screwed. On the shaft part 3 α is ten length s of only 8 mm, a steel shaft a helical compression spring 10 is provided, which is used with a diameter d of 4.7 mm on the one hand via a ring 11 on a collar 12 of the. Sleeve 1 and on the other hand on a collar 13 25 This advantage does not only apply to square cartridges, of the shaft part 3 a. This compression spring causes but also for cylindrical clamping cartridges that the steel shaft 3, 3 α constantly be designed with its rear also within the meaning of the invention End 7 is pressed against the adjusting screw 8. Who can and who are Head 4 of the set screw is fitted with a polygonal cylindrical clamping cartridge with collet recess 15 provided for a socket wrench, characterized with 30 by a simple design, which the longitudinal adjustment of the steel shaft 3 is in FIG. 8 and 9 is a further embodiment according to is effective. of the invention shown in which in a drill rod To clamp the front shaft part 3 & 28, a steel shaft 3, with the omission of a cartridge, a clamping sleeve provided with a longitudinal slot 16 is inserted directly. This steel shaft is provided screw 17, which has an axial bore 18 35 in a bore 29 of the drill rod for longitudinal displacement for receiving the shaft part 3 b and a conical bearing and a head 19 in the manner described above. The cartridge case 1 is provided with a transverse pin 5 and corresponding longitudinal grooves provided in the internal thread 20 for screwing in this tion 29 to prevent rotation of the clamping screw 17 and has an internal locking mechanism. Here, too, is to tighten the pre-cone 21, which cooperates with the outer cone 22 of the 40 Ren shaft part 3 b, a clamping screw 17 of the pre-clamping screw head. In the type described, a conical tightening of this clamping screw is provided, so a head 19 is provided. The outer cone 22 of this head, on the one hand, through the clamping action of the two cones, works together with a front end 3 b of the steel shaft in the inner cone 30 provided in the drill rod 28, so that the clamping screw is tightened and on the other hand 45 screw the clamping screw 17 in the inside, in turn, by the spreading action of the clamping thread 31 of the drill rod, the steel shaft 3 b is clamped in the screw with the conical head 19 and the cartridge case 1 in the clamping screw 17 in the manner described above. It is thus clamped in or in the boring bar 28,
fan way a very solid connection between "..,
the front steel shaft 3 b and the cartridge 50 i-atentansprucne:
sleeve 1 and thus a very stable, vibration-free 1st boring bar insert for a boring steel with the turning steel cutting edge 4 mounted in the cartridge in a cylindrical, longitudinally adjustable arrangement is sufficient. In spite of this fixed connection it is possible to press a screw compression spring against an adjusting screw 8, 14 with its rear part of the shaft by means of a tightened clamping nut 17 and its front and thus a very precise backlash-free setting the shaft part can be clamped, thereby identifying the drill steel cutting edge. draws that for clamping the front In the advantageous embodiment shown, the shaft part (3 b) has a longitudinally slotted (16), a conical head 19 of the clamping screw sunk into the end-axial bore (18) for receiving this shaft side of the cartridge case 1, such as 60 partly and a conical head (19) can be seen from the drawing. On the end face of the clamping screw (17), and the clamping screw head 19, there are transverse slots 23 for the drill rod (25, 28) or a clamping cartridge (1) which can be inserted into the drill rod and an internal thread wrench. (20) for screwing in this clamping screw As can be seen from the drawing, the front and an inner cone (21), on which the described square clamping cartridge 1 engages in a deconical head (19) of the clamping screw, is the corresponding square bore 24 of a boring bar 25 2. boring bar insert according to claim 1, daeinsetzt and is characterized in the boring bar by means of that the conical head (19) the clamping screw (17) in the boring bar (25, 28) or in the face of the cartridge (1) is arranged sunk. 3. boring bar insert according to claim 1 or 2, characterized in that on the end face of the conical head (19), transverse slots (23) are provided for a tubular socket wrench. Documents considered: German Patent No. 1079 422. 1 sheet of drawings 809 559/251 5.68 © Bundesdruckerei Berlin