Tool holder for an indexable cutting insert and cutting tool

Abstract

A tool holder (12) for an indexable cutting insert (13) is disclosed, comprising a tool holder base body (15), having a receiving pocket (20) for receiving an indexable cutting insert (13) and a fastening pin (17). The fastening pin (17) can assume a mounting position and a clamping position. In the mounting position, the fastening pin (17) can be positioned in a fastening opening (14) of an indexable cutting insert (13). In the clamping position, an indexable cutting insert (13) can be fixed in the receiving pocket (20) by means of the fastening pin (17). The fastening pin (17) is arranged on a fastening slide (16), displaceably arranged in the tool holder base body (15). Furthermore, a cutting tool (10) is disclosed, having a tool holder (12) and an indexable cutting insert (13).

Claims

1. A tool holder for an indexable cutting insert, having a tool holder base body in which a receiving pocket, comprising a base surface and a bearing structure, is arranged for receiving an indexable cutting insert, and having a fastening pin protruding from the base surface and capable of assuming a mounting position and a clamping position, wherein, in the mounting position, the fastening pin may be positioned in a fastening opening of an indexable cutting insert and, in the clamping position, an indexable cutting insert may be affixed in the receiving pocket by means of the fastening pin, characterized in that the fastening pin is arranged on a fastening slide, displaceably arranged in the tool holder base body and secured to the tool holder base body via a fastening bolt passing through the fastening slide and engaging an aperture in a recess wall of the tool holder base body.

2. The tool holder according to claim 1, characterized in that the fastening slide is displaceable parallel to the base surface.

3. The tool holder according to claim 1, characterized in that the fastening pin is cylindrical and has a thickening of the diameter at its end facing away from the fastening slide.

4. The tool holder according to claim 1, characterized in that the tool holder base body comprises a guide groove, and the fastening slide at least partially engages in the guide groove and is displaceable along the guide groove.

5. The tool holder according to claim 1, characterized in that the fastening slide is connected to the tool holder base body by means of a fastening bolt, and the fastening slide is displaceable by tightening the fastening bolt.

6. The tool holder according to claim 5, characterized in that a central axis of the fastening bolt extends substantially perpendicularly to a portion of the bearing structure.

7. The tool holder according to claim 5, characterized in that the fastening bolt passes through an opening in the fastening slide and cooperates with a thread in the tool holder base body.

8. A cutting tool, having a tool holder according to claim 1 and an indexable cutting insert with an indexable cutting insert base surface and an indexable cutting insert side surface, characterized in that the indexable cutting insert is fastened in the tool holder such that the indexable cutting insert base surface abuts the base surface and the indexable cutting insert side surface abuts the bearing structure, and the fastening pin is arranged in the fastening opening of the indexable cutting insert.

9. The cutting tool according to claim 8, characterized in that the fastening opening of the indexable cutting insert comprises a step, and a thickening of the diameter of the fastening pin engages behind the step such that the indexable cutting insert and the fastening pin are connected in a positive fit in the direction of a pin central axis.

10. The cutting tool according to claim 8, characterized in that the fastening opening of the indexable cutting insert is a through-hole, and a thickening of the diameter of the fastening pin engages behind an edge, facing away from the tool holder base body, of the fastening opening such that the indexable cutting insert and the fastening pin are connected in a positive fit in the direction of a pin central axis.

11. The cutting tool according to claim 8, characterized in that the bearing structure and the indexable cutting insert side surface are free of undercuts in a direction perpendicular to the base surface.

12. The cutting tool according to of claim 8, characterized in that the end, facing away from the fastening slide, of the fastening pin is flush with the indexable cutting insert.

13. The cutting tool according to claim 8, characterized in that the indexable cutting insert is displaced in the direction of the bearing structure or away from the bearing structure by a displacement of the fastening slide by means of the fastening pin.

14. A tool holder for an indexable cutting insert, having a tool holder base body in which a receiving pocket, comprising a base surface and a bearing structure, is arranged for receiving an indexable cutting insert, and having a fastening pin protruding from the base surface and capable of assuming a mounting position and a clamping position, wherein, in the mounting position, the fastening pin may be positioned in a fastening opening of an indexable cutting insert and, in the clamping position, an indexable cutting insert may be affixed in the receiving pocket by means of the fastening pin, characterized in that the fastening pin is arranged on a fastening slide, the fastening slide arranged in the tool holder base body and displaceable parallel to the base surface via a fastening bolt passing through the fastening slide.

15. The tool holder according to claim 14, wherein a tip of the fastening bolt threadingly engages an aperture in a recess wall of the tool holder base body.

Description

(1) The invention will be explained below with reference to various exemplary embodiments, which are shown in the accompanying drawings. In the figures:

(2) FIG. 1 shows a cutting tool according to the invention having a tool holder according to the invention in a perspectival exploded view,

(3) FIG. 2 shows the cutting tool according to the invention having the tool holder according to the invention from FIG. 1 in a perspectival view,

(4) FIG. 3 shows a tool holder base body of the tool holder according to the invention in a perspectival view,

(5) FIG. 4 shows a tool holder base body of the tool holder according to the invention from FIG. 3 in another perspectival view,

(6) FIG. 5 shows the tool holder according to the invention in a perspectival view,

(7) FIG. 6 shows the fastening slide and the fastening pin of a tool holder according to the invention in a side view,

(8) FIG. 7 shows schematically the cooperation of a fastening pin of a tool holder according to the invention with an indexable cutting insert according to one embodiment,

(9) FIG. 8 shows schematically the cooperation of a fastening pin of a tool holder according to the invention with an indexable cutting insert according to another embodiment, and

(10) FIG. 9 shows a cutting tool according to the invention and a tool holder according to the invention in a schematic overview.

(11) A cutting tool 10 comprises a tool holder 12 and an indexable cutting insert 13, having a central fastening opening 14, which is embodied as a through-hole in the illustrated exemplary embodiment.

(12) The tool holder 12 comprises a tool holder base body 15, a fastening slide 16, on which a fastening pin 17 is arranged, and a fastening bolt 18, having an axial central axis 19, with which the fastening slide 16 can be fastened to the tool holder base body 15.

(13) The shaft of the tool holder 12 is shown merely schematically and without any further designation.

(14) A receiving pocket 20 for the indexable cutting insert 13 is provided in the tool holder base body 15. The receiving pocket 20 comprises a base surface 22, as well as a bearing structure which is formed from a first bearing surface 24 and a second bearing surface 26 in the illustrated embodiment.

(15) In the embodiment shown, the receiving pocket 20 is open at the top and toward the two sides opposite the bearing surfaces 24 and 26.

(16) A recess 28 for receiving the fastening slide 16 is provided in the base surface 22. The recess 28 is somewhat larger in size than the fastening slide 16.

(17) A guide groove 30 is located at the bottom of the recess 28 into which groove the fastening slide 16 engages with a guide spring 32 formed thereon when it is mounted on the tool holder base body 15.

(18) The guide groove 30 encloses an angle of less than 90 with the first bearing surface 24, as well as with the second bearing surface 26.

(19) A hole with a thread 34 is also arranged in the tool holder base body 15. It extends substantially perpendicularly to the first bearing surface 24 and is designed such that the fastening bolt 18 can be screwed into it.

(20) The fastening slide 16, the guide spring 32, and the fastening pin 17 are integrally formed. In addition, an opening 40 is arranged in the fastening slide 16, through which opening a shaft of the fastening bolt 18 can be inserted. A head of the fastening bolt 18 cannot be inserted through the opening 40. The cross-section of the opening 40 is oval (see FIG. 6).

(21) The installation of the indexable cutting insert 13 on the tool holder 12 will be explained below.

(22) Starting from the state of the cutting tool 10 shown in FIG. 1, the fastening slide 16 is first positioned in the recess 28. The guide spring 32, which is connected to the fastening slide 16, is arranged in the guide groove 30.

(23) In addition, the shaft of the fastening bolt 18 is inserted through the opening 40 and screwed into the hole with the thread 34. Thus, the fastening slide 16 is connected to the tool holder base body 15. However, the fastening bolt 18 is not tightened yet.

(24) The central axis 19 of the fastening bolt 18 then extends substantially perpendicularly to the first bearing surface 24.

(25) The fastening slide 16 can thus only be displaced parallel to the base surface 22.

(26) The state shown in FIG. 5 is obtained. In this state, the fastening slide 16, and thus the fastening pin 17, can be displaced manually along the guide groove 30.

(27) The fastening pin 17, protruding from the base surface 22, and the fastening slide 16 then move with respect to the first bearing surface 24 and the second bearing surface 26 in a direction that encloses an angle of less than 90 with the first bearing surface 24 and the second bearing surface 26.

(28) This position of the fastening pin 17 is the mounting position.

(29) Next, the indexable cutting insert 13 is pushed onto the fastening pin 17. For this purpose, the fastening pin 17 passes through the fastening opening 14 of the indexable cutting insert 13, and the indexable cutting insert base surface 42 of the indexable cutting insert abuts with the base surface 22.

(30) The end of the fastening pin 17 facing away from the fastening slide 16 is flush with the top side of the indexable cutting insert 13 (see FIG. 2).

(31) The fastening bolt 18 is then tightened, i.e., screwed into the hole with the thread 34. The fastening slide 16 is pulled along the guide groove 30 toward the first bearing surface 24 and the second bearing surface 26.

(32) The indexable cutting insert 42 can thereby glide on the base surface 22.

(33) Thereby, a first indexable cutting insert side surface 44 of the indexable cutting insert 13 is placed against the first bearing surface 24, and a second indexable cutting insert side surface 46 of the indexable cutting insert 13 is placed against the second bearing surface 26.

(34) In addition, the fastening pin 17 shifts within the mounting opening 14 transversely to its pin central axis 48. As can be seen in FIG. 6, the fastening pin is circular-cylindrical and comprises a thickening of its diameter 50 at its end facing away from the fastening slide 16.

(35) This corresponds to a step 52 on the inner circumference of the fastening opening 14 of the indexable cutting insert 13. A positive fit between the fastening pin 17 and the indexable cutting insert 13 is thus produced in the direction of the pin central axis 48 (see FIG. 7).

(36) FIG. 8 shows an alternative embodiment of the fastening pin 17 and the fastening opening 14. In this embodiment, the fastening opening 14 has a pure through-hole. The thickening of the diameter 50 of the fastening pin 17 then engages behind an edge 54 of the fastening opening 14 facing away from the tool holder base body 15.

(37) In contrast to the aforementioned embodiment, the fastening pin 17 is no longer flush with the indexable cutting insert.

(38) The remaining components remain unchanged with respect to the former embodiment.

(39) As a result, the fastening pin 17 is in a clamping position, and the indexable cutting insert 13 is affixed and positioned on the tool holder 12 by abutting the base surface 22 with its indexable cutting insert base surface 42, abutting the first bearing surface 24 with its indexable cutting insert side surface 44, and abutting the second bearing surface 26 with its indexable cutting insert side surface 46 (see FIG. 2).

(40) In this case, the indexable cutting insert side surfaces 44, 46 abut the bearing surfaces 24, 26 in a direction perpendicular to the base surface 22, without undercut.

(41) To remove the indexable cutting insert 13 from the tool holder 12, the fastening bolt 18 is released.

(42) For this purpose, the fastening bolt 18 does not have to be completely unscrewed from the hole with the thread 34. It is sufficient if the fastening bolt 18 is screwed out of the hole with the thread 34 far enough that the fastening slide 16 can be manually moved along the direction defined by the guide groove 30 away from the first bearing surface 24 and the second bearing surface 26, such that the positive fit between the indexable cutting insert 13 and the fastening pin 17 is released.

(43) The fastening pin 17 is then again in the mounting position, and the indexable cutting insert 13 can be lifted off the tool holder 12 in the direction of the pin central axis 48.