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DE-102012216654-B4 - Rotatable chip-removing tool

DE102012216654B4DE 102012216654 B4DE102012216654 B4DE 102012216654B4DE-102012216654-B4

Abstract

Rotary-driven cutting tool (1) with a holder (10) extending along an axis of rotation (2) and a cutting head (20) held coaxially on the holder (10) by screwing it to a threaded sleeve (13) arranged in the holder (10), wherein the threaded sleeve (13) is arranged in the holder (10) in a rotationally fixed manner and is axially supported at least in the direction of the cutting head (20), and the cutting head (20) is axially clamped against the holder (10) by means of a threaded spindle (30) screwed into the threaded sleeve (13), characterized in that the threaded spindle (30) has a differential thread with opposing thread sections (30a, 30b) which are screwed into a threaded bore (13e) in the threaded sleeve (13) and a threaded bore (20c) in the cutting head (20).

Inventors

  • Bruno Teusch

Assignees

  • Gühring KG

Dates

Publication Date
20260513
Application Date
20120918

Claims (13)

  1. Rotary-driven cutting tool (1) with a holder (10) extending along an axis of rotation (2) and a cutting head (20) held coaxially on the holder (10) by screwing it to a threaded sleeve (13) arranged in the holder (10), wherein the threaded sleeve (13) is arranged in the holder (10) in a rotationally fixed manner and is axially supported at least in the direction of the cutting head (20), and the cutting head (20) is clamped axially against the holder (10) by means of a threaded spindle (30) screwed into the threaded sleeve (13), characterized in that the threaded spindle (30) has a differential thread with opposing thread sections (30a, 30b) which are screwed into a threaded bore (13e) in the threaded sleeve (13) and a threaded bore (20c) in the cutting head (20).
  2. Tool (1) after Claim 1 , characterized in that the cutting head (20) has an axial projection (20b) at its holder-side end which is inserted in an axial receiving opening (12e) in the holder (10).
  3. Tool (1) after Claim 2 , characterized in that the axial projection (20b) and the receiving opening (12e) are each conically shaped.
  4. Tool (1) after Claim 2 or 3 , characterized in that the cutting head (20) has at its holder-side end a front surface (20e) surrounding the axial projection (20b) in a ring shape, which rests against an opposite front surface (12g) on the holder (10).
  5. Tool (1) according to one of the Claims 1 until 4 , characterized in that the holder (10) is formed from a base body (11) and a receiving part (12) which is held rotationally and axially fixed on the base body (11) and in which the threaded sleeve (13) is arranged.
  6. Tool (1) after Claim 5 , characterized in that the receiving part (12) is force-fitted into the base body (11).
  7. Tool (1) according to one of the Claims 1 until 6 , characterized in that the threaded sleeve (13) arranged in the holder (10) is axially supported in the direction of the cutting head (20) via a flange-like radial projection (13a) on a radial step (12c) formed in the holder (10).
  8. Tool (1) according to one of the Claims 1 until 7 , characterized in that the threaded spindle (30) is accessible via an axial through-pass (20d) open at the end face in the cutting head (20).
  9. Tool (1) after Claim 8 , characterized by a removable closing element (40) arranged in the axial passage (20d), which closes the axial passage (20d).
  10. Tool (1) according to one of the Claims 1 until 9 , characterized by a coolant/lubricant channel (50a) running along the axis of rotation (2) centrally through the holder (10) and the threaded spindle (30) into the cutting head (20) for supplying the cutting head (20) with a coolant/lubricant supplied from the holder side.
  11. Tool (1) after Claim 10 , characterized in that the central cooling/lubricating channel (50a) in the cutting head (20) branches into at least one branch channel (50b) which leads to at least one associated cutting edge on the cutting head (20).
  12. Tool (1) according to one of the Claims 1 until 11 , characterized in that the threaded sleeve (13) is received in the holder (10) with a clearance fit and is connected to the holder (10) at least in a rotationally fixed manner.
  13. Tool (1) according to one of the Claims 1 until 12 , characterized in that the cutting head (20) is formed from a carrier body (20a) and one or more cutting elements (21) attached to the carrier body (20a).

Description

The invention relates to a rotary-driven cutting tool, in particular a ball track milling cutter, with a holder extending along an axis of rotation and a cutting head held coaxially on the holder by screwing it to a threaded sleeve arranged in the holder. Such a tool is made from the WO 2008 / 116 446 A1 known. The WO 2008 / 116 446 A1 This document shows and describes in particular a tool system (tool) with an HSK tool holder (holder) for coupling to a machine tool spindle and a ball track milling cutter (cutting head). The ball track milling cutter consists of a solid carbide milling head to which a shank is integrally attached and which carries four cutting inserts made of a hard material, e.g., CBN or PCD. The shank is shrink-fitted into a bore in a steel intermediate piece. The ball track milling cutter and intermediate piece are thus integrally connected. The intermediate piece has a threaded extension that is screwed into a sleeve-shaped component with an internal thread (threaded sleeve), which is axially fixed with lateral play in a bore in the tool holder. To attach the ball track cutter (cutting head with intermediate piece) to the tool holder, the sleeve-shaped component is screwed onto the pin extension of the intermediate piece using a hex key inserted through the HSK shank of the tool holder into an internal hexagon socket in the sleeve-shaped component. This draws the pin extension into the tool holder, bringing an annular flat surface on the intermediate piece into contact with a corresponding end-face flat surface on the tool holder. The [unclear text] WO 2008 / 116 446 A1 The described tool also has a cooling/lubricating agent supply system with a main channel extending centrally along the axis of rotation through the tool holder, the intermediate piece and the shank into the milling head, which finally branches into several branch channels in the milling head, each leading to a cutting edge of the milling head. In the WO 2008 / 116 446 A1 The described tool's sleeve-shaped component is only accessible for actuation via the HSK shank of the tool holder. This means that changing the milling head is only possible when the tool holder is disconnected from a machine tool spindle. Furthermore, the intermediate piece connecting the milling head to the tool holder increases the number of parts in the tool system and features connection points to the milling head and tool holder that require special attention during manufacturing to ensure the necessary rigidity for high concentricity. The printed matter DE 10 2012 104 606 A1 discloses a rotary-driven cutting tool according to the preamble of claim 1. The printed documents WO 2003 / 051 564 A1 and DE 10 2009 012 433 A1 reveal further rotary-driven cutting tools. Starting from the DE 10 2012 104 606 A1 The invention aims to create a simply constructed, compact tool, in particular a ball track milling cutter, in which the cutting head can be changed even when the tool is coupled to a machine tool spindle, thereby achieving a reliable, fixed axial clamping of the cutting head against a holder of the tool. This problem is solved by a tool having the features of claim 1. The dependent claims relate to advantageous or preferred embodiments of the tool according to the invention, as well as advantageous embodiments of individual elements of the tool according to the invention. A rotary-driven cutting tool according to the invention, which in a special embodiment is a ball track milling cutter, has a holder extending along an axis of rotation and a cutting head held coaxially on the holder by screwing it to a threaded sleeve arranged in the holder. It is characterized in that the threaded sleeve is arranged in the holder in a rotationally fixed manner and is axially supported at least in the direction of the cutting head, and the cutting head is axially clamped against the holder by means of a threaded spindle screwed into the threaded sleeve. The threaded spindle has a differential thread with opposing thread sections that are screwed into a threaded bore in the threaded sleeve and a threaded bore in the cutting head. The holder is like the one from the WO 2008 / 116 446 A1 The cutting head is a known tool designed for coupling to a machine tool spindle. It has a suitable shank, e.g., a known HSK shank. The cutting head has one or more cutting edges. It can be formed in one piece, e.g., from solid carbide or a hard material. In an advantageous embodiment, however, the cutting head consists of a carrier body, preferably made of steel or solid carbide, and one or more cutting elements attached to the carrier body, e.g., indexable inserts, preferably made of a hard material, in particular CBN or PCD, or with a hard material coating, in particular CBN or PCD. PCD, formed. The cutting elements can be attached to the carrier body by means of a material bond, e.g. by soldering or gluing. Unlike the one from the WO 2008 / 116 446 A1 In a known tool, in a tool a