WO2024255953A1 - Vorrichtung und verfahren zum wirbeln eines innengewindes - Google Patents
Vorrichtung und verfahren zum wirbeln eines innengewindes Download PDFInfo
- Publication number
- WO2024255953A1 WO2024255953A1 PCT/DE2024/100470 DE2024100470W WO2024255953A1 WO 2024255953 A1 WO2024255953 A1 WO 2024255953A1 DE 2024100470 W DE2024100470 W DE 2024100470W WO 2024255953 A1 WO2024255953 A1 WO 2024255953A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- whirling
- guide part
- dome
- vortex
- mandrel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/32—Thread cutting; Automatic machines specially designed therefor by milling
- B23G1/34—Thread cutting; Automatic machines specially designed therefor by milling with a cutting bit moving in a closed path arranged eccentrically with respect to the axis of the rotating workpieces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/22—Machines specially designed for operating on pipes or tubes
- B23G1/225—Machines specially designed for operating on pipes or tubes automatically controlled
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2220/00—Details of turning, boring or drilling processes
- B23B2220/52—Whirling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2220/00—Details of milling processes
- B23C2220/52—Orbital drilling, i.e. use of a milling cutter moved in a spiral path to produce a hole
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2220/00—Details of milling processes
- B23C2220/68—Whirling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G2210/00—Details of threads produced
- B23G2210/04—Internal threads
Definitions
- the invention relates to a device for whirling an internal thread designed according to the preamble of claim 1. Furthermore, the invention relates to a method for the machining production of an internal thread by whirling.
- EP 1 820 592 A2 deals with the production of multi-start thread-like profiles, wherein it is proposed to synchronize the speeds and angles of rotation of a workpiece and a cutting tool in such a way that the production of at least some of the threads of the profile takes place continuously.
- a whirling mandrel used for cutting of the machine described in EP 1 820 592 A2 is guided in a so-called support head, which is a tubular part.
- the support head has a cylindrical guide section at its end as a section of enlarged diameter, which is guided in a sliding manner on an inner surface of the workpiece.
- the whirling mandrel projects beyond the support head including the guide section and carries a cutting tool in the area that projects beyond the guide section.
- the cutting tool comprises a tool body equipped with a hard metal cutting insert.
- thread whirling is a circular thread milling process.
- a whirling tool rotates at high speed while the workpiece rotates comparatively slowly.
- the tool and workpiece can rotate either in parallel or in opposite directions.
- relative movements between the tool and the workpiece in the axial direction must be coordinated with the profile to be created and with the rotational movement of the workpiece.
- machine tools with two opposing spindles are particularly suitable for thread whirling.
- DE 19922 891 C2 discloses a tool holder with a rotatably driven tool spindle for whirling internal threads, whereby the axis of rotation of the tool runs at an angle to the axis of the threaded hole in the workpiece.
- a drive spindle is connected to a tool spindle by a double-link universal joint shaft. This is intended to provide adjustment options that allow the tool holder to be used to produce different thread pitches.
- DE 1 280638 A concerns a device for whirling steep and/or long internal threads.
- a lifting movement of a whirling mandrel is derived from an obliquely arranged disk on which the whirling mandrel is supported in an articulated manner via a sliding shoe.
- a whirling device described in DE 102011 110 131 B4 comprises a tool which is arranged on a spindle which can be driven in a rotating and linearly displaceable manner. It is possible to achieve either only a rotary movement or only a linear movement of the spindle or to achieve a simultaneous rotary and linear movement.
- the invention is based on the object of achieving progress over the aforementioned prior art in the whirling of internal threads, whereby a particularly favorable relationship between manufacturing effort and precision is also sought for threads with a large length/diameter ratio.
- the cutting device comprises, in a basic concept known per se, a swirl dome on which a cutting tool intended for producing the internal thread is located.
- the cutting device also comprises an elongated guide part that supports the swirl dome.
- a guide section is formed at the end of the guide part, which has an enlarged diameter in relation to the adjacent area, i.e. shaft, of the guide part and is intended for contacting an inner circumferential surface of a workpiece.
- the shaft of the guide part like the guide section also provided by the guide part, does not necessarily have a circular cross-section.
- the risk of the tool jamming in the workpiece bore can be effectively counteracted by a cross-sectional design of the guide section in which contact is only made between the inner surface of the workpiece and the surface of the guide section at defined surface sections that are small compared to the total surface of the guide section.
- the outer contour of the guide part can be left free where no supporting force is required.
- contact with the workpiece bore is only made at two separate surfaces that are arranged opposite the force introduction by the machining process.
- the whirling mandrel is always arranged eccentrically to the guide section.
- the vortex dome is arranged opposite the guide part, wherein means for aligning the vortex dome in relation to the guide part are formed on the opposite end faces of the vortex dome and the guide section.
- the machining device can be used for producing single-start threads as well as for producing multi-start threads or other structured internal surfaces, whereby it is particularly suitable for small diameters and large hole depths compared to the hole diameter.
- the cutting tool can be a cutting head that is an integral part of the vortex dome.
- a cutting head that is formed in one piece with the vortex dome there can also be a cutting head that is interchangeably attached to a shaft of the vortex dome.
- Designs can also be implemented in which the cutting tool is in the form of at least one interchangeable cutting plate attached to the vortex dome.
- the cutting tool can have either a single cutting edge or a plurality of cutting edges, for example three cutting edges.
- the means mentioned for aligning the swirl dome in relation to the guide part allow a relative rotation between the swirl dome and the guide part and are formed, for example, by a pin and an associated bore, whereby the pin is located on one of the two parts, swirl dome and guide part, and the bore is located on the front side of the other part.
- a purely segment-like formation of contours for aligning the swirl dome with respect to the guide part during machining is also possible.
- the pin is located on the swirl dome in a section that protrudes beyond the cutting tool, while the guide section is provided with a corresponding bore.
- the guide section can also be provided with a pin-shaped extension that engages in a front-side bore in the swirl dome.
- the process for producing an internal thread by whirling generally comprises the following steps:
- whirling i.e. machining
- the whirling mandrel and the workpiece can either rotate in the same direction, for example both clockwise, or in opposite directions.
- the functionality of a center drive spindle can also be taken over by a finishing machine in which the workpiece is firmly clamped, while the rotation axis of the tool and the alignment contour of the guide part are moved circularly in a consistent manner.
- the method according to the application can be used, for example, to produce an internal thread on a nut of a screw drive.
- the screw drive is a simple motion thread.
- the screw drive can be designed in particular as a rolling screw drive. This means that raceways for rolling elements, in particular balls of a ball screw drive, are produced by whirling.
- Fig. 1 shows a detail of a device for whirling an internal thread
- Fig. 2 Components of the device according to Fig. 1 in a positioning before starting the machining process, i.e. thread whirling.
- a production machine identified overall by the reference number 1, is designed as a machine tool with a center drive. This means that a tubular workpiece 2 can be machined from both sides.
- the production machine 1 is used as a device for whirling an internal thread 3.
- a whirling mandrel 4 of the device 1 comprises a cutting head 5 and a shaft 6.
- the cutting head 5 is generally referred to as a cutting tool.
- the cutting head 5 is connected in one piece to the shaft 6.
- the cutting tool 5 could be in the form of cutting plates, for example, which are attached directly or indirectly to the shaft 6.
- the central axis of the whirling mandrel 4 including the cutting head 5 is designated MA4.
- the device 1 i.e. the manufacturing machine for internal thread whirling, also includes a rod-shaped guide part 7. At the end of the guide part 7 there is a cylindrical guide section 8 with a larger diameter than the rest of the guide part 7. The diameter of the guide section 8 corresponds approximately to the inner diameter of the workpiece 2.
- the shaft of the guide part 7 is designated 9. If the guide part 7 is pushed into the workpiece 2, as is the case in the configuration according to Fig. 1, an annular gap is formed between the outer peripheral surface of the shaft 9 and the inner peripheral surface of the workpiece 2, designated 10. The workpiece 2 is supported by the guide section 8 which rests on the inner peripheral surface 10.
- the central axis of the guide part 7, designated MA7 coincides with the central axis of the workpiece 2 in this state.
- the machining process carried out with the production machine 1 to produce the internal thread 3 is particularly characterized by the fact that the whirling mandrel 4 and the guide part 7 are introduced into the workpiece 2 from opposite sides, which can be seen in both Fig. 1 and Fig. 2.
- the whirling mandrel 4 is located centrally in the workpiece 2.
- a slightly eccentric arrangement of the whirling mandrel 4 would also be possible in this phase, as long as the cutting head 5 does not touch the inner circumferential surface 10.
- the whirling mandrel 4 is moved from right to left with respect to the arrangement according to Fig. 2.
- Axial displacements of the whirling mandrel 4 are generally designated AV4.
- the whirl mandrel 4 has a pin 11 that projects beyond the cutting head 5 and, in conjunction with a recess 12 designed as a blind hole on the front side of the guide section 8, represents a means for aligning the whirl mandrel 4 in relation to the guide part 7.
- the recess 12 is located eccentrically in the guide section 8.
- RV4 a radial displacement of the whirl mandrel 4
- the internal thread 3 can be produced by machining either from right to left or from left to right, based on the arrangements according to Figs. 1 and 2.
- the axial displacement of the guide part 7 designated AV7 corresponds to the axial displacement AV4 of the whirling dome 4. This means that the axial distance between the guide section 8 and the cutting head 5 does not change during whirling.
- the guide part 7 including the guide section 8 remains in an unchanged angular position during thread whirling.
- the whirling dome 4 including the cutting head 5 performs a rapid rotation RS.
- a relatively slow rotation RW of the workpiece 2 takes place, which is coordinated with the axial displacements AV4 and AV7.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Turning (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202480017410.9A CN120897815A (zh) | 2023-06-15 | 2024-05-22 | 用于旋风切削内螺纹的装置和方法 |
| KR1020257030056A KR20250142444A (ko) | 2023-06-15 | 2024-05-22 | 내부 나사산을 선회 가공하기 위한 장치 및 방법 |
| JP2025555714A JP2026508971A (ja) | 2023-06-15 | 2024-05-22 | 雌ねじをねじ切りするための装置及び方法 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102023115583.0A DE102023115583B4 (de) | 2023-06-15 | 2023-06-15 | Vorrichtung und Verfahren zum Wirbeln eines Innengewindes |
| DE102023115583.0 | 2023-06-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024255953A1 true WO2024255953A1 (de) | 2024-12-19 |
Family
ID=91582110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2024/100470 Ceased WO2024255953A1 (de) | 2023-06-15 | 2024-05-22 | Vorrichtung und verfahren zum wirbeln eines innengewindes |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2026508971A (de) |
| KR (1) | KR20250142444A (de) |
| CN (1) | CN120897815A (de) |
| DE (1) | DE102023115583B4 (de) |
| WO (1) | WO2024255953A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102024124883A1 (de) * | 2024-08-30 | 2026-04-23 | Erwin Junker Maschinenfabrik Gmbh | Vorrichtung und verfahren zum schleifen von innenkonturen an werkstücken |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1280638B (de) | 1966-04-30 | 1968-10-17 | Burgsmueller Karl | Vorrichtung zum Wirbeln von Innengewinden |
| DE19922891C2 (de) | 1999-05-19 | 2002-02-28 | Gfe Ges Fuer Fertigungstechnik | Werkzeughalter zum Gewindewirbeln |
| EP1820592A2 (de) | 2006-02-21 | 2007-08-22 | Burgsmüller GmbH | Vorrichtung zur zerspanenden Herstellung von gewindeartigen Profilen |
| DE102011110131B4 (de) | 2011-08-15 | 2019-05-02 | Leistritz Produktionstechnik Gmbh | Bearbeitungsvorrichtung, insbesondere Wirbelvorrichtung |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017130056A1 (de) * | 2017-12-14 | 2019-06-19 | Mirko Flam | Wirbelapparat |
-
2023
- 2023-06-15 DE DE102023115583.0A patent/DE102023115583B4/de active Active
-
2024
- 2024-05-22 KR KR1020257030056A patent/KR20250142444A/ko active Pending
- 2024-05-22 CN CN202480017410.9A patent/CN120897815A/zh active Pending
- 2024-05-22 JP JP2025555714A patent/JP2026508971A/ja active Pending
- 2024-05-22 WO PCT/DE2024/100470 patent/WO2024255953A1/de not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1280638B (de) | 1966-04-30 | 1968-10-17 | Burgsmueller Karl | Vorrichtung zum Wirbeln von Innengewinden |
| DE19922891C2 (de) | 1999-05-19 | 2002-02-28 | Gfe Ges Fuer Fertigungstechnik | Werkzeughalter zum Gewindewirbeln |
| EP1820592A2 (de) | 2006-02-21 | 2007-08-22 | Burgsmüller GmbH | Vorrichtung zur zerspanenden Herstellung von gewindeartigen Profilen |
| DE102011110131B4 (de) | 2011-08-15 | 2019-05-02 | Leistritz Produktionstechnik Gmbh | Bearbeitungsvorrichtung, insbesondere Wirbelvorrichtung |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102023115583B4 (de) | 2025-02-13 |
| KR20250142444A (ko) | 2025-09-30 |
| CN120897815A (zh) | 2025-11-04 |
| DE102023115583A1 (de) | 2024-12-19 |
| JP2026508971A (ja) | 2026-03-13 |
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