EP4547419A1 - Schmiedestrategie smx - Google Patents
Schmiedestrategie smxInfo
- Publication number
- EP4547419A1 EP4547419A1 EP23728317.1A EP23728317A EP4547419A1 EP 4547419 A1 EP4547419 A1 EP 4547419A1 EP 23728317 A EP23728317 A EP 23728317A EP 4547419 A1 EP4547419 A1 EP 4547419A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- workpiece
- forging
- radial forging
- radial
- tools
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
- B21J7/02—Special design or construction
- B21J7/14—Forging machines working with several hammers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
- B21J7/20—Drives for hammers; Transmission means therefor
- B21J7/46—Control devices specially adapted to forging hammers, not restricted to one of the preceding subgroups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/02—Special design or construction
- B21J9/06—Swaging presses; Upsetting presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/10—Drives for forging presses
- B21J9/20—Control devices specially adapted to forging presses not restricted to one of the preceding subgroups
Definitions
- the invention relates to a method for radial forging a workpiece from an initial state to a final state by means of a radial forging machine, comprising forging tools arranged around the circumference of the workpiece, preferably four forging tools, and a radial forging machine for carrying out such a method.
- overforging a stitch
- the workpiece is reshaped by repeated action of the tools; an action of the tools can also be referred to as a stroke or tool stroke.
- the entire forming of the workpiece is usually carried out using successive stitch sequences in the form of a stitch plan.
- a stitch plan therefore consists of several stitches and describes the development of the workpiece geometry from the initial state to the desired final state.
- the forming process on a radial forging machine can be divided into two types of forming, namely forming, in which the workpiece structure is formed in such a way that the required workpiece quality is achieved with the highest possible productivity, and on the other hand, so-called finishing, in which the surface is optimized accordingly .
- finishing in which the surface is optimized accordingly .
- the most widely used strategy is to perform workpiece forming in a spiral forging mode. After each tool stroke, the workpiece is rotated by a defined angle and moved in such a way that in the subsequent stroke an area that has not yet undergone complete deformation is reshaped with the help of the tools. This means that the tool completely covers the surface of the workpiece throughout the entire pass. In this spiral forging mode, the movement, i.e. the possible feed, is limited by the maximum tool length and the angle of rotation for rotating the workpiece. With this spiral forging strategy, all, preferably four, forging tools are always in motion with every stroke and thus take part in the forming and reshape the workpiece in the same shape.
- Another known forging strategy provides that all, preferably 4, forging tools also reshape the workpiece with each stroke, but there is no rotation of the workpiece between the strokes.
- This strategy is called straight-ahead mode and bears some similarity to common forging processes on open-die forging presses. By eliminating the workpiece rotation after a stroke, it is possible to increase the feed rate compared to the spiral forging strategy.
- forging an octagonal cross-section for example, there is no complete forging of the workpiece surface in this pass.
- a forging strategy for radial forging machines that has so far only rarely been used is one in which the available tools be controlled in pairs.
- opposing tools are controlled together and take part in the forming process; other tools are controlled at a different time or with a different target dimension.
- This forging strategy is also called flat mode. In flat mode, it is also possible for a pair of tools to remain at a target dimension during the stitch and at least limit the free flow of material in the lateral direction, which is caused by the pair of tools fully participating in the forming.
- a method for radial forging a workpiece from an initial state to a final state wherein the radial forging is preferably carried out several times following a pass plan by one
- the initial state is transformed into a final state by means of a radial forging machine, which comprises forging tools arranged around the circumference of the workpiece.
- a radial forging machine which comprises forging tools arranged around the circumference of the workpiece.
- four forging tools are arranged around the circumference of the workpiece.
- the radial forging machine is designed and arranged to carry out radial forging in at least three operating modes, namely A) spiral mode, B) straight mode and C) flat mode.
- the workpiece is formed from an initial state to a final state in a sequence of radial forging passes, with at least two of the three different operating modes being applied consecutively, ie directly and without intermediate passes.
- the invention refers to a stitch as a sequence of forming processes in a predetermined operating mode over the entire length of the workpiece or at least a predetermined partial length of the workpiece.
- the method for radial forging should include at least two different and successive operating modes, for example a first stitch in spiral mode, followed by a second stitch in straight mode, followed in turn by a third stitch in spiral mode, possibly followed by a flat mode. Every conceivable combination of operating modes in the stitch sequence is covered by the idea of the invention, as long as two consecutive stitches implement different operating modes. This means that stitch sequences are also included in the inventive concept, in which several consecutive stitches implement the same operating mode, but then followed by a different operating mode.
- finishing pass is not taken into account as a forming operation and therefore does not represent a separate operating mode.
- an improvement in the local shape change and thus an improvement in product quality can be achieved.
- the process chain can also be shortened by reducing pre-forging processes.
- the method according to the invention allows a forming process that is optimally adapted to the workpiece and its material quality, in particular with the best possible forging of the workpiece as a whole and taking into account the shape change distribution within the workpiece.
- the application and/or the sequence of the different operating modes depends on the material of the workpiece. It is advantageous to use the requirements that need to be taken into account for certain materials when creating the stitch plan.
- different materials can be combined into material classes, which can optionally be subjected to the same sequence of operating modes. These material classes are, for example: carbon steels, tempered steels, high-speed steels, cold-work steels, hot-work steels, rust- and acid-resistant steels, nickel-based alloys, high-temperature steels and titanium alloys, to name just a few.
- material classes are, for example: carbon steels, tempered steels, high-speed steels, cold-work steels, hot-work steels, rust- and acid-resistant steels, nickel-based alloys, high-temperature steels and titanium alloys, to name just a few.
- the radial forging process which can then influence the selection of operating modes and the sequence of operating modes to be used, depending on the material.
- the workpiece in the operating mode of the spiral mode, is rotated at a predetermined angle of rotation about its longitudinal axis after each forging tool stroke. It is preferred if all forging tools participate in the forming process, preferably evenly. In an equally preferred embodiment of the invention, in the operating mode of the straight-ahead mode, there is no rotation of the workpiece about its longitudinal axis after each tool stroke. In this context, it is particularly preferred if all forging tools participate in the forming process evenly.
- the method according to the invention is preferably carried out with a control device which is designed and set up to calculate an optimal stitch sequence for the workpiece and then specify it to the radial forging machine so that the optimal stitch sequence is carried out.
- a control device which is designed and set up to calculate an optimal stitch sequence for the workpiece and then specify it to the radial forging machine so that the optimal stitch sequence is carried out.
- the control of the radial forging machine is carried out on the basis of a pass plan calculation program, which generates an optimal stitch sequence taking into account the optimal forging strategies.
- the starting temperature for example, is preferably also taken into account Furnace temperature, and particularly preferably also the material quality, are specified.
- the technology program can then calculate the best stitch sequence using all possible forging strategies.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022206670 | 2022-06-30 | ||
| DE102022206855.6A DE102022206855A1 (de) | 2022-06-30 | 2022-07-05 | Schmiedestrategie SMX |
| PCT/EP2023/063572 WO2024002582A1 (de) | 2022-06-30 | 2023-05-22 | Schmiedestrategie smx |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4547419A1 true EP4547419A1 (de) | 2025-05-07 |
Family
ID=86688441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23728317.1A Pending EP4547419A1 (de) | 2022-06-30 | 2023-05-22 | Schmiedestrategie smx |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20250387826A1 (de) |
| EP (1) | EP4547419A1 (de) |
| WO (1) | WO2024002582A1 (de) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3800220C1 (de) * | 1988-01-07 | 1989-02-02 | Pahnke Engineering Gmbh & Co Kg, 4000 Duesseldorf, De | |
| DE102009034541B3 (de) * | 2009-07-23 | 2011-04-07 | Langenstein & Schemann Gmbh | Verfahren und Vorrichtung zum Streckschmieden von gedrallten Teilen |
| CN111922264A (zh) * | 2020-06-22 | 2020-11-13 | 大冶特殊钢有限公司 | 一种径锻不旋转锻造方法 |
| CN114178453B (zh) * | 2021-11-04 | 2023-08-18 | 大冶特殊钢有限公司 | 一种高合金方坯的径向锻造方法 |
-
2023
- 2023-05-22 WO PCT/EP2023/063572 patent/WO2024002582A1/de not_active Ceased
- 2023-05-22 US US18/879,339 patent/US20250387826A1/en active Pending
- 2023-05-22 EP EP23728317.1A patent/EP4547419A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20250387826A1 (en) | 2025-12-25 |
| WO2024002582A1 (de) | 2024-01-04 |
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Legal Events
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