Groove insert, clamping holder for a groove insert and groove cutting tool

Abstract

A groove insert to be received in a tool holder has, along its top and bottom side and on its rear side, a holding structure which is formed by holding faces which taper toward one another and by way of which the groove insert is fixed in the tool holder in a positive locking manner. The tool holder has corresponding counter faces. The groove insert and the tool holder form a groove cutting tool.

Claims

1. A groove insert to be received in a clamping holder, comprising: two opposite ends, wherein one end is a front side defined by a main free face and the opposite end defined by a rear side, which extends substantially parallel to the front side; a top side, a bottom side, and a plurality of side faces, wherein a major edge formed at an intersection between the front side and the top side, and wherein the top side includes a top holding structure having a pair of holding faces that taper toward one another to form a longitudinal rib having a central, longitudinal groove therebetween, and wherein the bottom side includes a bottom holding structure having a pair of holding faces that taper toward one another to form a longitudinal rib having a central, longitudinal groove therebetween, and wherein the rear side includes a rear holding structure having a pair of holding faces that taper toward one another, and wherein the top holding structure, the bottom holding structure and the rear holding structure enable the groove insert to be securely mounted in a clamping holder.

2. The groove insert as claimed in claim 1, wherein the bottom holding structure extends over the entire length of the bottom side.

3. The groove insert as claimed in claim 1, wherein the top side further includes a front portion extending from the main edge to a continuation, and wherein the top holding structure extends from the rear side to the continuation.

4. The groove insert as claimed in claim 3, wherein the central, longitudinal groove of the top holding structure extends through the continuation.

5. The groove insert as claimed in claim 1, wherein the top holding structure and the bottom holding structure diverge in the direction of the rear side.

6. The groove insert as claimed in claim 1, wherein the front side and the rear side taper toward each other by up to 10 in the direction of the top side.

7. A clamping holder having a receiving means for a groove insert as claimed in claim 1, said clamping holder comprising a carrier and a clamping jaw having a bottom side with a top holding structure, which abuts the top holding structure of the groove insert and can be pressed against the top holding structure of the groove insert by way of a clamping means, the carrier further comprising a rear holding structure, which abuts the rear holding structure of the groove insert, and a bottom holding structure, which abuts the bottom holding structure of the groove insert, wherein the rear holding structure and the bottom holding structure are a one-piece component of the carrier.

8. The clamping holder as claimed in claim 7, wherein the carrier has a front face, and wherein the rear holding structure extends at an angle of between 3 and 5 with respect to a plane parallel to the front face.

9. The clamping holder as claimed in claim 7, wherein the carrier has a front face, and wherein the bottom holding structure on the carrier forms an angle of less than 90 with respect to the front face of the carrier.

10. The clamping holder as claimed in claim 7, wherein the top holding structure of the clamping jaw and the bottom holding structure on the carrier continuously extend toward one another in the direction of the front face from the rear side.

11. The clamping holder as claimed in claim 7, wherein the top holding structure, the bottom holding structure and the rear holding structure merge into one another to define a receiving means for the insert.

12. The clamping holder as claimed in claim 7, wherein the carrier has a front face and wherein a slot disposed between the carrier and the clamping jaw extends obliquely upward with respect to a plane that is perpendicular to the front face.

13. The clamping holder as claimed in claim 12, wherein the clamping jaw extends obliquely downward in the direction of the front face.

14. The clamping holder as claimed in claim 7, wherein the clamping means is a clamping screw with a head having an underside, wherein a contact face which is opposite the underside of the head is provided on the clamping jaw and the contact face extends in an oblique manner with respect to the underside of the head such that a clamping force is generated with a force component which is directed in the direction of the rear side.

15. A groove cutting tool, comprising: a clamping holder having a carrier and a clamping jaw having a bottom side with a top holding structure, the carrier further comprising a rear holding structure, and a bottom holding structure which abuts the bottom holding structure of the groove insert, wherein the rear holding structure and the bottom holding structure are a one-piece component of the carrier; and a groove insert received in the clamping holder, said groove insert having two opposite ends, wherein one end is a front side defined by a main free face and the opposite end defined by a rear side, which extends substantially parallel to the front side; a top side, a bottom side, and a plurality of side faces, wherein a major edge formed at an intersection between the front side and the top side, and wherein the top side includes a top holding structure having a pair of holding faces that taper toward one another to form a longitudinal rib having a central, longitudinal groove therebetween, and wherein the bottom side includes a bottom holding structure having a pair of holding faces that taper toward one another to form a longitudinal rib having a central, longitudinal groove therebetween, and wherein the rear side includes a rear holding structure having a pair of holding faces that taper toward one another, wherein the top holding structure of the clamping jaw abuts the top holding structure of the groove insert when the groove insert is received in the clamping holder, and wherein the rear holding structure of the carrier abuts the rear holding structure of the groove insert when the groove insert is received in the clamping holder, and wherein the bottom holding structure of the carrier abuts the bottom holding structure of the groove insert when the groove insert is received in the clamping holder.

16. The groove cutting tool as claimed in claim 15, wherein the top side of the groove insert further includes a front portion extending from the main edge to a continuation, and a top holding structure extending from the rear side to the continuation.

17. The groove cutting tool as claimed in claim 16, wherein the longitudinal groove extends through the continuation.

18. The groove cutting tool as claimed in claim 15, wherein the top holding structure of the insert and the bottom holding structure of the insert diverge in the direction of the rear side of the insert.

19. The groove cutting tool as claimed in claim 15, wherein the front side of the insert and the rear side of the insert diverge with respect to each other by up to 10 in the direction of the top side of the insert.

20. The groove insert as claimed in claim 1, further comprising a flush face extending obliquely upward from the bottom side and having a top portion that opens outwardly and obliquely to the rear side, and a rounding extending between the top side and the rear side, wherein the flush face and the rounding shortens a length of the rear side.

21. The groove insert as claimed in claim 1, wherein the top and bottom holding structures are identical in shape.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further features and advantages of the invention are produced from the following description and from the following drawings, to which reference is made. The drawings are as follows:

(2) FIG. 1 shows a perspective view of a first embodiment of the groove cutting tool as claimed in the invention having a groove insert as claimed in the invention and a clamping holder as claimed in the invention;

(3) FIG. 2 shows a perspective view of a first embodiment of the groove cutting tool as claimed in the invention having a groove insert as claimed in the invention and a clamping holder as claimed in the invention;

(4) FIG. 3 shows a perspective view of the groove insert as claimed in the invention shown in FIG. 1;

(5) FIG. 4 shows a perspective view of the groove insert according to FIG. 3 from obliquely behind;

(6) FIG. 5 shows a front view of the groove insert according to FIG. 3;

(7) FIG. 6 shows a side view of the groove insert according to FIG. 3;

(8) FIG. 7 shows a side view of the clamping holder as claimed in the invention, which can be seen in FIG. 1;

(9) FIG. 8 shows an enlarged sectioned view of a detail of the clamping holder according to FIG. 7 in the region of the clamping means;

(10) FIG. 9 shows a perspective view of a second embodiment of a groove cutting tool as claimed in the invention;

(11) FIG. 10 shows the carrier of the clamping holder shown in FIG. 9, without a clamping jaw, as claimed in a second embodiment of the clamping holder as claimed in the invention;

(12) FIG. 11 shows a side view of a second embodiment of the groove insert as claimed in the invention;

(13) FIG. 12 shows a top view of the groove insert according to FIG. 11;

(14) FIG. 13 shows a perspective front view of the groove insert according to FIG. 11;

(15) FIG. 14 shows an enlarged sectioned view through the groove cutting tool as claimed in the invention according to FIG. 9 in the region of the clamping means;

(16) FIG. 15 shows an enlarged view of a detail of the groove cutting tool as claimed in the invention according to FIG. 9 without a clamping jaw; and

(17) FIG. 16 shows an enlarged side view of the groove cutting tool according to FIG. 9 in the region of the groove insert.

DETAILED DESCRIPTION OF THE INVENTION

(18) FIG. 1 shows a groove cutting tool, for example for cutting grooves. The groove cutting tool includes a clamping holder 10, which has a carrier 12 for a groove insert 14 and a clamping jaw 16 which is integrally molded on the carrier 12. The clamping jaw 16 has on its top side a through-opening, through which a clamping means 18 in the form of a clamping screw extends as far as into the carrier 12, where a thread is realized (see FIG. 7).

(19) The clamping jaw 16 presses from above onto the insert 14 and clamps said insert between itself and the carrier 12.

(20) It can be seen in FIG. 1 that the width of the groove insert 14 is the same as or ever greater than the width of a narrow arm 20 of the clamping jaw 16 and greater than the width of a narrow web 22 of the carrier 12, both of which come directly into contact with the groove insert 14. The tool is able to cut deeply into a workpiece by means of the narrow embodiment of the arm 20, the web 22 and the groove insert 14.

(21) It can be seen with reference to FIG. 2 that the clamping holder 10 has a bottom side, referred to below as bottom supporting face 24. By way of said face 24, the clamping holder 10 abuts against a tool holder, for example the lathe.

(22) A front face 26, to which the so-called main free face 28 of the insert 14 connects toward the top, extends substantially vertically with respect to the bottom contact face 24. The main free face 28 protrudes forward somewhat and is angled with respect to the so-called main edge 30. The main edge 30 is also called the main cutting edge.

(23) It can also easily be seen from FIG. 2 that the clamping holder 10 is divided by a slot 34, which extends upward obliquely from the so-called rear side 32 of the insert 14, into the carrier 12 and the clamping jaw 16. The slot 34 runs out from the top end of the rear side 32.

(24) The insert 14 has two ends, also called longitudinal ends. The one end is the front side, which is defined by the main free face 28, the opposite end is defined by the rear side 32 (see FIG. 3). The top side 36 opposite the supporting face 24 includes three portions, namely a front portion 38, which proceeds from the main edge 30 to an optional continuation 40, which can be provided for chip breaking, and a holding portion with a top holding structure 42.

(25) The holding structure 42 includes holding faces 46 which proceed from opposite side faces 44 and taper obliquely upward and toward one another.

(26) The holding faces 46 are preferably realized flush, which also applies to the following remaining holding faces on the clamping holder 10 and on the groove insert 14 which are also explained.

(27) A type of convex longitudinal rib is produced by the holding faces 46 which extend upward and toward one another. Said longitudinal rib can also be designated as a type of prism.

(28) As an option, this is not absolutely necessary, the longitudinal rib has a preferably central longitudinal groove 48 which extends over the entire length of the longitudinal rib 46 and through the continuation 40. The longitudinal groove 48 serves, on the one hand, to reduce expenditure on material and, on the other hand it can be used as a cooling channel. Said cooling channel is supplied with coolant or even gas by means of one or several corresponding bores 50 (see FIG. 7) in the clamping jaw 16 or the carrier 12.

(29) The holding faces 46 form a conical, top holding structure 42, which extends over the entire top side 36, with the exception of the chip-guiding portions.

(30) The rear side 32 is also provided with a holding structure 52 (called the rear-side holding structure). Said holding structure 52 is also defined by two holding faces 54 which taper toward one another and are flush. The holding structure 52 extends over the entire length of the rear side. The rear side is defined by the rear-side end of the insert 14. The form of the holding structure 52 is consequently also realized as a type of longitudinal rib.

(31) A bottom holding structure 55, which is formed by two holding faces 56 which taper toward one another (see FIG. 5), also extends over the entire length of the bottom side 37. The form of a longitudinal rib is also produced in this case.

(32) All the holding faces 46, 54, 56 extend along their corresponding faces, for the top and bottom holding faces 46 and 56 this means in the direction from the front to the rear end and for the rear-side holding faces 54 it means upward.

(33) It can be seen in FIG. 5 that, similarly as the top holding structure 42, the bottom holding structure 55 also has a central longitudinal groove 58 to save on material.

(34) FIG. 6 shows that the transitions from the top side to the rear side 36 and 32 and from the bottom side 37 to the rear side 32 are realized as capped corners. Said capping of each corner shortens the length of the rear side 32, material saving being connected thereto. This also serves as an ejector contact face.

(35) The capped bottom corner is formed by a flush face 60 which extends obliquely upward and in the region of its top end opens out into a face which extends obliquely to the rear.

(36) The capped top corner is formed by a rounding 62 which ends, however, before reaching the rear side 32.

(37) It can also easily be seen in FIG. 6 that the groove insert 14 increases slightly in height continuously from the main free face 28 to the rear side 32. The top and the rear side consequently enclose an angle of up to 5, preferably of between 3 and 5. Once the holding faces 46 and 56 are preferably the same height over the length, the angle can be measured either on the outer ends of the holding structures or, as shown in FIG. 6, at the start of the holding faces 46, 56, that means adjoining the respective side face 44.

(38) The front side with its main free face 28 and the rear side 32 are substantially parallel to one another. This definition includes a slight angular deviation of up to 10 (see angle in FIG. 6), at which the main free face 28 and the rear side 32 taper toward one another in the direction of the top side 36.

(39) In side view the basic form of the insert 14 with the exception of the capped corners is substantially a parallelogram.

(40) FIG. 7 shows the receiving means 64 in the clamping holder 10 formed between the clamping jaw 16 and the carrier 12.

(41) The edge of the clamping holder 10 which defines the receiving means 64 is realized with a circumferential holding structure which is realized in a complementary manner to the holding faces 46, 54 and 56. This means that the bottom holding structure 66 on the carrier 12 is realized as a V-shaped groove, having two oblique faces or holding faces which taper toward one another and abut over the entire area against the bottom holding structure 55 of the insert 14 and consequently over the entire area against the holding faces 46. The bottom holding structure 66 merges into the rear holding structure 68 in a radius. The rear holding structure 68, after this, that is after bridging the slot 34, merges into a top holding structure 70 which is realized on the bottom side of the clamping jaw 16.

(42) All the holding structures 66, 68, 70 have the same cross section and are aligned with respect to one another such that they can be generated by a double equal-angle milling cutter which runs through a U-shaped movement path.

(43) As can also be seen from FIG. 7, the top, the bottom and the rear side holding structure 70, 66 or 68 consequently extend over the entire edge of the receiving means 64.

(44) As a result of the slot 34 which is directed obliquely upward, the clamping jaw 16 extends obliquely downward in the direction of the front face 26, that is toward a plane E which is defined by the bottom holding structure 66.

(45) The receiving means 64 is realized so as to be completely free of corner holes, that means that no corner hole is present in the region between the rear-side holding structure 68 and in each case the top and bottom holding structure 70 or 66.

(46) The bottom holding structure 66 with its holding faces extends in side view (see FIG. 7) proceeding from the front face 26 at an angle of less than 90 in the direction of the rear holding structure 68. This means that the angle between the plane E and a perpendicular onto the front face 26 is greater than 0. The angle is a maximum of 5.

(47) The rear holding structure 68 extends either perpendicular with respect to the bottom supporting face 24 and/or parallel to the front face 26 or, as shown in FIG. 7, inclined slightly forward, that is inclined forward at an angle of up to 5, preferably within the range of between 3 and 5 upward and in relation to the perpendicular onto the supporting face 24 or to a parallel plane with respect to the front face 26.

(48) The clamping means 18 preferably does not extend parallel to the front face 26 and perpendicular to the bottom supporting face 24, but is slightly inclined away from the front face 26 (see FIG. 7). The corresponding angle of inclination is preferably between 2 and 5.

(49) Said inclination is present so that the underside 72 of the head only abuts against a contact face 74 on the top side of the clamping jaw 16 in the region of its front end, that is in the region of the end close to the front face 26. This consequently ensures that once the clamping jaw 16 is bent downward, a force component is always exerted onto the clamping jaw 16 by the clamping means 18, which is slightly inclined in the direction of the rear side 32 and consequently has a force component into said direction. Over and above this, once the clamping jaw 16 is bent, it is also ensured that the clamping means 18 exerts a good lever arm onto the clamping jaw 16 and consequently a good clamping force by the contact being located a long way forward, that is closer to the front face 26.

(50) The embodiment according to FIGS. 9 to 15 corresponds substantially to the one described beforehand such that only the differences have still to be discussed below.

(51) In the case of said embodiment also, the briefly detailed groove insert 14 has along the bottom side, along the entire rear side and on the top side, in the region of the non-chip-guiding faces, holding faces 46, 54 and 56 which taper toward one another, are aligned with respect to one another and which form corresponding longitudinal rib-like holding structures 42, 52, 55.

(52) In the case of said embodiment, the corners in the transition between the top side and the bottom side are also capped in each case to the rear side, in this case by a level chamfer of between 30 and 45.

(53) In the case of said embodiment, the groove insert 14 also increases slightly in height toward the rear side 32, and in the installed state the bottom side extends slightly downward and obliquely rearward.

(54) As a difference to the previous embodiment, however, the clamping jaw 16 is realized as a separate part which is fastened on the carrier 12 by means of a clamping means 18. To this end, the carrier 12 (see FIG. 10) has a prism-like contour 75 along the supporting face for the clamping jaw 16, and the clamping jaw has a counter contour on its bottom side in order to ensure a precise alignment between the clamping jaw 16 and the carrier 12.

(55) As a result of the separate clamping jaw 16, it is possible for the top and bottom side 36 and 37 to diverge by more than 5 with respect to the rear side 32

(56) In contrast to the preceding embodiment, a corner hole 76 is present at the transition between the bottom holding structure 66 and the rear holding structure 68 in the carrier 12 (see FIG. 15).

(57) In order to ensure that a permanent clamping force, above all a clamping force with a component which is directed in the direction of the rear side 32, is exerted onto the insert 14 by the clamping jaw 16, a vertical offset is present between the top holding structure 42, which is directed obliquely upward, on the insert 14 and the contour 75. Said vertical offset is shown in FIG. 14 by the gap h.

(58) Over and above this, it can be seen in FIG. 14 that the longitudinal axis of the clamping means 18 is realized slightly offset or tilted with respect to the corresponding opening in the clamping jaw 16 (see offset or angular offset K), such that it is ensured that the clamping means 18 presses by way of its rear-side end against the edge of the opening in the clamping jaw 16. This consequently creates a force component which endeavors to press the clamping jaw 16 obliquely to the right, that is away from the front face 26 and upward.

(59) FIG. 15 shows the vertical offset h between the corresponding supporting face on the top side 36 of the groove insert 14 and the contour 75 for the clamping jaw 16 on the carrier.

(60) The cross-sectional geometries of the contour 75 and of the top holding structure 70 on the groove insert 14 are realized in an identical manner.

(61) The rear holding structure 68, into which the corresponding holding structure 52 in the groove insert 14 penetrates and is mounted in a positive locking manner, is realized below the contour 75 on the carrier 12.

(62) In the case of said embodiment, the groove insert 14 is not realized as an indexable insert either, so that the length of the back or rear holding structure 52 is as long as possible. Neither is there any other geometry present on the groove insert 14 in the region of the holding structure 52, which simplifies the production thereof.