DE2248854C2 - Cutting tool for machining - Google Patents

Description

'"'f'schncidwerkwug according to claim 1, characterized in that each area of application is formed by a separate hole (53, 54, 55) and that at least two clamping bolts (59 60) for engagement at least in the area of the contact surface (23) the holder recess (2) facing holes (53,54) are present.

9. Cutting tool according to claim 8, characterized in that the clamping bolt (58 59, 60) and holes (53, 54, 55) are cylindrical in a manner known per se and fit into one another with a play fit. ,. ··. ο

10 Cutting tool according to claims 8 and 9, characterized in that each hole (* 3 54 55) through a clamping bolt (58, 59, 60) 'and the clamping bolt (58) acting on the cutting tip hole (55) in the direction approximately perpendicular to the contact surface (23) d = r valley recess (2) are acted upon

11 Cutting tool according to claims to 10, characterized in that the clamping bolts (58 59 60) below the turning plate (s2) are acted upon by a common clamping member (64, 72) in the intended radial directions and that the clamping member is thrown in a manner known per se. i a clamping screw (45) can be displaced in a clamping direction (71) running approximately perpendicular to the clamping bolt axes

P cutting tool according to claim 11, characterized characterized in that the clamping member (64) is plate-shaped and the clamping bolt (58 59 60) with a common recess (66) and that the jacket of the recess has such designed and aligned pressure surfaces (67, 68, 70), c'ass these at a displacement of the tendon in the tensioning direction (71) the tensioning bolts in the intended, differently oriented clamping devices

push. .

13 cutting tool according to claim 1 to K), characterized in that the tensioning member opens into the Schncidspitzcnloch (55) Clamping bolt (58) encompassing the band and pulling it in the direction of the contact surface (23) (72) is the two strands (73, 74) of which the two remaining 'Spannbolzen (59, 60) on their each other tangent to the facing side and partially embrace, in such a way that when the band is tightened in the direction of tension, the two remaining Spannbolz.cn (59, 60) are pushed away from each other in the spreading sense.

14. Cutting tool according to claim l.i. through this characterized in that the band (72) is closed in a ring-like manner and through the cone (47) is tensioned by a tensioning screw (45) which is known per se and is wrapped by the band.

The invention relates to a cutting tool with a triangular hole turning plate, the rope edges of which in pairs each form the point angle of a cutting point and the perforated jacket by means of a by a clamping bolt acting on the

jruckes with its opposite to the active cutting tip Side surface is tensioned against a contact surface jiner holder recess, the Vfantel of the plate hole with three analogous to the angle »Corner of an equilateral triangle standing to one another Loading areas is provided for the clamping bolt system and by clamping in one the areas of application in addition to the main component of the contact pressure on both sides in mung-facing loading area in about The cutting direction of the connecting lines can be applied from the inside to the outside.

An embodiment of that inherent in the invention The basic idea provides that the areas of application are known per se Way formed by the corner areas of a triangular cross-sectional shape of the insert hole are and that the clamping bolt has the cross-sectional shape

at right angles to this effective Spreizdriickkompo- io has about an angle and with the end faces nents are generated (German Offenlegungsschrift its leg ends to the Beaufschlagungsberei-1 552 308). chen is applied. So the insert hole is similar

Compared to the main cutting pressure and the turning plate hole of the known cutting mechanism back pressure, these hole turning plates are supported by a triangular cross-sectional shape, only speaking contact surfaces in a recess of the 15 with the difference that the angle bisector clamping steel holder is supported. The supports of the triangular hole are not twisted with respect to the bisector of the triangular outline of the locking plate, but coincide with them. The cross-sectional shape of the clamping bolt has the effect that the angle is elastically variable in shape . By tightening the clamping bolt, the angle is expanded. This A ... fspreizung generates the pressure components parallel to one contact surface of the Halterausnehmung. In order to favor these minor molding tools of the type mentioned at the beginning, the plan changes in the angular cross-section of the clamping hole essentially in the form of an equilateral bolt, it is also provided that triangles are formed. Here, the corners of the perforation pressure applied to the areas of application of the perforated jacket are aligned in such a way that they are rounded in the direction and the end faces of the leg ends are rounded off towards the center point of the triangular cables of the reversible. The same purpose uicni nlattcnümmes wiser .. In other words, the further feature is that the cross-sectional contour aer the bisector of the hole triangle opposite surfaces of / between the bcaufschlagungshcroi über the bisector of the contour shape of the just lieaenden hole jacket areas cmc in the direction

Compared to the feed pressure, however, causes considerable difficulties, since the main purpose of the cutting tool as a copy-turning tool, the two plate edges of the (active) cutting tip in operation are free and unabgeslUtt over their entire length. In order to achieve an improved definition compared to the feed pressure, the cutting

Turning plate rotated by about 60 ° around the hole axis. The tension of Locliwendcp'.attc takes place at the known cutting tool essentially by the radial displacement of a clamping bolt, the one with its circumference in the corner of the three-channel hole is printed, which points in the direction of the contact surface of the holder recess. Since the Arch shape slightly protruding towards the center of the hole having. This creates inclined surfaces on which the end faces of the Leg ends of the clamping bolt cross section can slide better when tensioned. The outer cone the cross-sectional shape: the clamping bolt corresponds to the cross-sectional contour of the neighboring one

The reason for the naitcrausneiimung weisi. ua uci> i "". iu uu v ^ '- ^ · ■ - ■. . . ,

Clamping bolts on two sides of the triangular hole 40 perforated jacket. Also in favor of the Λ.u -

is, a clamping component is not only vertically spreading the angular cross-sectional shape ^d "Span ™ ol-

to the launching surface of the halo. Instead, when there is a voltage, the Mcrkma, dall uic, is used

'9. »1 .... .π: · .u_ γλ ........ ι ,,,;. 1 ₁₁ 1:; rl · .- Λ, τ <sn: iiinbo / enschenkel im Hl-

also exercised parallel in both directions to the contact surface of the holder recess. This becomes without With the aid of a stationary lateral contact surface for the toilet column, increased support also compared to the hole v.endeplattc effective feed pressure guaranteed.

The function of the known cutting tool now requires that the Lochccken ilen Wendepialien-. ' Side edges come very close and thus the Wendcplattc Especially in the middle of the main cutting edge there is a weakening of the material. This disadvantage can / u an increased fracture risk, especially at higher Lead to stress.

The invention is based on the object of providing a cutting tool of the Ai! vw create that on the one hand the inherent advantages of the known cutting tool of an optimal cross-sectional thickness of the clamping bolt legs is reduced richly between the leg ends and the leg root compared to the cross-sectional thickness of the legs

Line / wide embodiment of the invention The underlying idea is that each Beaufsdilagiingsbereich through a separate hole

y · is formed and that at least / wci clamping bolts for engagement are at least ¹ MHd in the holes facing the contact surface of the I laheraiisnehniimg. This embodiment has the further advantage of an even smaller weakening of the signal

of the entire cutting body In particular, it is provided that each hole through a clamping pin and the one acting on the cutting tip hole Spannbol / s in the direction approximately perpendicular to the Anlagcfükhe the holding area are acted upon. the

ifd

Support of the opening plate also opposite Go by the

nloch

the feed pressure, but on the other hand avoids the disadvantages of a cross section weakness in the middle area of the cutting edges. This object is achieved in that the connecting lines between adjacent beai.fs.-hlagungsbeieichen run approximately parallel to the adjacent side edges of the hole turning plate and that the two dtf contact surfaces of the holder cut-out acts fully.

Clamping bolts ^ ..,. ^ - ·,

constantly the Haltcrausnch- "perpendicular to Anlagcflächc nin. · Wael-end in the area of the two remaining Snannlöciier the described act Spreiz.drücke The clamping bolt of this embodiment are below dei insert by a common its intended Radialnclitungen

Spann-Iied in
Ml

den provided The tendon is known per se

Way by means of a clamping screw approximately perpendicular The tensioning device running along the tensioning bolt axes can be displaced 1 938 405).

In one embodiment it is provided that the clamping member is plate-shaped and does Spannbolzcn includes a common recess and that the casing of the recess designed and aligned printing areas on

Cover a (negative plate). The side edges 17 IS, 19 each form the tip angle in pairs I of a cutting tip 20, 21, 22. The one shown in FIG and 2 (active) cutting tips in the operating position are denoted by 20. In assembly the wall plate 15 lies with its side surface assigned to the side edge 18 on the contact surface 23 above the undercut 3. The Weudeplattenloch is denoted by 24. F.s knows

shows that when the tension is shifted, roughly speaking, it has a triangular cross-sectional shape link in the tensioning direction, the tensioning bolts in the front, with the three impact areas 25, 26,

■ · · ■: -i ..-.— «. ·,:.,! 27 for the tension in the direction of one of the

three cutting tips 20, 21, 22 are aligned. An imaginary connecting line 28 between the two

Band is the two strands of which the other two clamping bolts on their facing side tangent and partially entwine, in such a way that at

seen, differently aligned tension directions push. Another embodiment looks
before that the tendon of a clamping bolt encompassing the clamping bolt opening into the cutting tip hole 15 adjacent loading areas 25, 26 runs approximately parallel to the adjacent side edge 17 of the hole wcndcplattc 15

rcichc 25, 26. 27 of the jacket of the hole 24 are rounded. The cross-sectional contour of the surface

when the tape is tightened in the direction of tension, the two 20 between the impact areas 25, the other clamping bolts in the spreading direction of one another 26, 27 with hole jacket areas 29, 30. 31 be pushed away. In particular, that points in the direction of the hole center is slightly Band closed like a ring and is due to the protruding arch shape. The clamping bolt is with

32 designated. The tensioning bolt has approximately the cross-sectional shape in its area which is essential for tensioning at an angle and lies with the end faces 33, 34 of the ends of its legs 35, 36 on the two loading areas 26, 27 of the wall panel 15, which in the assembly of the Ariiagcfläche 23 facing the Haltcrausnchmung2 are. The end faces 33, 34 of the screws 35, 36 are corresponding to the surface shape of the Be

tensioned the cone of a known per se, wrapped by the tape tensioning screw.

The subject matter of the invention is illustrated by the embodiments shown in the drawings explained in more detail. It shows

1 shows an exploded view of an embodiment the subject of the invention,

F i g. 2 shows a section along line IT-II in Fig. 1 by the cutting tool in the assembled state,

3 shows a plan view of the cutting tool according to FIG.

4 shows an exploded view of a second embodiment with two Spannglicdvariantcn, Fi g. 4 a and 4 b,

F i g. 5 is a plan view of the cutting tool

impact areas 25, 26, 27 rounded. The cross-sectional thickness 37 of the clamping bolt snails in the The area between the legs 35, 36 and the leg root 38 is opposite to the transverse line thickness the leg ends 35, 36 decreased. At the lower end of the clamping bolt is a flange-like Projection 39 arranged with which the instep

according to FIG. 4 with the tendon F i g. 4 a in locking 40 bolts 32 on a shoulder 40 of the recess 41

assembly with the hole wall removed to accommodate the clamping bolt. In its

plate, _ ^La e ^c is the Spannbolzcn 32 by a snap ring

· * - · '" ■ - ■ <--'--- · 42 secured, which in the enlarged hole 43«

FIG. 6 shows a representation analogous to FIG. 5, but with the tendon according to FIG. 4 b,

7 shows a section along the line VII-VII in FIG. 6 with inserted turning plate.

The holder 1 has a recess 2 open on both sides at its front end. De; · lower, with an undercut 3 provided part of the recess

45

for receiving the Erwcitcrungsflanschcs 39 is used.

The tendon 4 is provided with two bores 43, 44. The hole 43 surrounds with delicious Play the clamping bolt 32. In the bore 44 protrudes

_w the clamping screw 45 into the threaded hole

Mung2 serves to accommodate the plate 46 of the holder 1 that can be screwed in. The tense Spannglicdes4. The side edges 5,6 of the screw 45 lies with its conical shaft area The clamping member 4 closes flush with the side edge 47 on the rear wall 48 of the bore 44 th 7. 8 of the front end of the holder 1 from. Accordingly.

On the other hand there is between the curved back- The mode of operation of the tension of the wall

wall9 of the Spannglicdes4 and the corresponding 55 plate 15 is as follows: By screwing in the Wall 10 (dash-dotted) of the holder 1 a gap. In tensioning screw 45 in the direction of arrow 49, the the blind hole 11 (dash-dotted line in FIG. 1) is moved by a tensioning member 4 in the direction of arrow 50. Included

Push pin 12 can be inserted, which is located with the interposition of a helical spring 13 at the bottom of the blind hole 11 supports. The bolt 12 lies with its end face 14 on the rear wall 9 of the clamping member on. As a result, the spring 13 exerts a pressure on the

takes the hole 43 of the Spannglicdes 4 the clamping bolt 32 with and deflects it in the radial direction. The end faces 33, 34 of the Clamping bolt legs to the loading areas 26, 27 of the hole 24. With another

Tensioning member 4 facing away from the holder 1 Tightening the clamping screw 45 spread the execution. Leg of the Spannbolzcns and thus practice the

In the upper part of the recess! On the 6 _{5, the} desired expansion effect to support the tendon 4 is provided by the indexable plate 15. It shows the shifting pressure on the indexable plate 15. This crack shape of an equilateral triangle. The lateral spreading effect is promoted by the cross-section weak surfaces 16 open into the chung 37 at a right angle. The end faces roll

33, 34 of the leg ends 35, 36 slightly in the Loading areas 26, 27.

In the embodiment of FIG. 4 is the Holder 51 is basically constructed in the same way as holder 1. As far as the holder 51 is identical in its design to the holder 1, the same reference numerals are used used. In this regard, reference is made to the explanation of FIG. 1 to 3 referenced.

In contrast to the insert 15 of the embodiment according to FIG. 1 to 3 shows the insert 52 on three holes 53, 54, 55, which form the impingement areas and similar to the impingement areas 25, 26, 27 of the embodiment according to FIG. 1 to 3 are effective.

For tensioning the insert 52, whose outline is otherwise identical to the outline of the Is insert 15, the overall designated 56 clamping bolt unit is determined. In it are - connected by a base plate 57 - three clamping bolts 58, 59, 60 combined, which with loose play in corresponding receiving bores 61, 62, 63 are mounted and with their ends also with loose Play into the holes 53, 54, 55 of the hole turning plate 52. That between the base the recess 2 and the reversible hole plate 52 inserted clamping member 64 is - like the clamping member 4 - with ζ ·, egg holes 65, 66, one of which (65) is used to receive the clamping screw 45, whose Mode of operation based on FIG. 1 to 3 has been explained. Hole 65 is identical to hole 44 of the clamping member 4, as well as the contour shape of the clamping member 64 corresponds to that of the clamping member 4. The shape of the hole 66 differs fundamentally from the hole 43 of the clamping member 4. It has about the cross-sectional shape of an angle, the two legs of which enclose a wedge 67 between them, whose wedge angle points in the direction of the storage surface 23 of the holder 51. The flanks 68, 69 of the wedge are intended to rest on the clamping bolts 60, 59, while the clamping bolts 58 are in the area the rounding connecting the two legs of the cross-sectional shape of the hole 66 to one another 70 is arranged. If the clamping screw 45 is tightened and consequently the clamping member 64 in the direction of the arrow 71 pulled, the rounding 70 of the hole 66 pulls the clamping bolt 58 in the direction approximately perpendicular the contact surface 23 on the holder 51, while the wedge 67 spreads the two clamping bolts 59, 60 apart. As a result, the holes 55, 53, 54 of the turning plate 52 are acted upon accordingly, the accordingly drawn to the contact surface 23 and by the spreading action on the part of the clamping bolts 59, 60 also against increased feed pressure

ίο is held securely.

In the embodiment according to FIG. 4b is on In place of the tensioning element 64, a self-contained tensioning band 72 is provided. The strap includes the clamping bolt opening into the cutting tip hole 55 and pulling it in the direction of the contact surface 23. The two strands 73, 74 of the tensioning band 72 are tangent to the two remaining tensioning bolts 59, 60 on the side facing each other and wrap around the clamping bolts 59, 60 partially in such a way that that when tightening the tensioning band 72 in the tensioning direction, the two tensioning bolts 59, 60 in the Spreading senses are pushed away from each other. To achieve this spreading effect, the effective The diameter of the contact surface 47 of the tensioning screw 45 on the tensioning strap 72 can be greater than that Distance between the two clamping bolts 59, 60 and / or facing the contact surface 23 on the holder 51 or the diameter of the clamping bolt 58 associated with the cutting tip hole 55 must be larger than the distance between the two remaining clamping bolts 59, 60.

The function of the clamping screw 45 corresponds to that described above in this embodiment as well Functioning analogous to the German Offenlegungsschrift 1 938 405.

When using a tension member in the form of a band 72 according to Figure 4b is between the bottom surface 75 of the recess 2 and the turning plate 52, a spacer washer 76 is inserted, which is provided with a recess for receiving the tensioning strap mechanism and for the passage of both the tensioning bolts 58, 59, 60 and the clamping screw 45 is provided. This recess is accordingly from top to bottom designed throughout.

For this purpose 2 sheets of drawings

409 631/33

:; .v ■? ■■■

Claims (7)

Patent claims: 1.Cutting tool for machining with a triangular hole insert, the side edges of which in pairs form the tip angle of a cutting tip and which is clamped against a contact surface of a holder recess with its side surface opposite the active cutting tip by means of a contact pressure exerting on the hole jacket by a clamping bolt, whereby the jacket of the plate hole is provided with three pressure areas analogous to the angle corners of an equilateral triangle to each other to the clamping bolt system and by clamping in one of the pressure areas in addition to the main component of the contact pressure, effective expansion pressure components are generated on both sides at right angles to this, characterized that connecting lines (28) between adjacent loading areas (25, 26, 27; 53, 54, 5S) run approximately parallel to the adjacent side edges (17) of the perforated turning plate (15; 52) and that in each case d ie the two areas of application (26, 27; 53, 54) are acted upon approximately in the cutting direction of the connecting lines (28) from the inside to the outside. 2. Cutting tool according to claim 1, characterized in that the R ^ impact areas (25, 26, 27) are formed in an sicn bekt -inter way by the corner areas of a triangular cross-sectional shape of the Weiideplattenloches (24) and that the clamping bolt (32) the cross-sectional shape has approximately an angle and rests with the end faces (33, 34) of its shank ends (35, 36) on the loading areas (26, 27). 4 " 3. Cutting tool according to claim 2, characterized in that the loading area (25 to 27) of the perforated jacket rounded and the end faces (33, 34) of the wing ends (35, 36) are rounded accordingly. 4. Cutting tool according to claims 2 and 3, characterized in that the cross-sectional contour of the surfaces (29 to 31) of the perforated jacket areas lying between the loading areas one in the direction of the The center of the hole has slightly projecting arcuate shapes. 5. Cutting tool according to claim 2 to 4, characterized in that the outer contour of the Cross-sectional shape of the clamping bolt (32) of the cross-sectional contour of the adjacent perforated jacket is equivalent to. 6. Cutting tool according to claim 2 to 5. characterized characterized in that the cross-sectional thickness (37) of the clamping bolt legs in the area between Leg ends (35, 36) and Schcnkelwurzcl (38) compared to the cross-sectional thickness of the Sclienkelenden (35, 36) is reduced. 7. Cutting tool according to claims 1 and 2, characterized in that the clamping bolt longitudinal axis c runs approximately perpendicular to the cutting body surface in a manner known per se and the tension due to radial collapses movement or deflection of the spam bolt (32)