ZA200301960B - Device and method for fracture-separating workpieces. - Google Patents
Device and method for fracture-separating workpieces. Download PDFInfo
- Publication number
- ZA200301960B ZA200301960B ZA200301960A ZA200301960A ZA200301960B ZA 200301960 B ZA200301960 B ZA 200301960B ZA 200301960 A ZA200301960 A ZA 200301960A ZA 200301960 A ZA200301960 A ZA 200301960A ZA 200301960 B ZA200301960 B ZA 200301960B
- Authority
- ZA
- South Africa
- Prior art keywords
- fracture
- force
- workpiece
- spreader
- fracture separation
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 19
- 238000000926 separation method Methods 0.000 claims description 64
- 230000010355 oscillation Effects 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000005520 electrodynamics Effects 0.000 claims description 2
- 230000005489 elastic deformation Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D31/00—Shearing machines or shearing devices covered by none or more than one of the groups B23D15/00 - B23D29/00; Combinations of shearing machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D31/00—Shearing machines or shearing devices covered by none or more than one of the groups B23D15/00 - B23D29/00; Combinations of shearing machines
- B23D31/002—Breaking machines, i.e. pre-cutting and subsequent breaking
- B23D31/003—Breaking machines, i.e. pre-cutting and subsequent breaking for rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
- F16C9/04—Connecting-rod bearings; Attachments thereof
- F16C9/045—Connecting-rod bearings; Attachments thereof the bearing cap of the connecting rod being split by fracturing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Description
AMENDED SHEET
®
Apparatus and Process for Fracture Separation of Workpieces
The invention relates to an apparatus for fracture separating workpieces in accordance with the preamble of claim 1, and a process for fracture separation of workpieces in accordance with claim 8. The claims mentioned above are to be considered as an integral part of this specific description.
Fracture separation of workpieces is employed, e.g., for manufacturing split bearing bores. In the process, two predetermined fracturing locations having the form of axial notches are diametrically applied at the inner peripheral surface of the bearing bore. Through application of a fracture separation force, the bearing bore subsequently separates at the predetermined fracturing locations into a bearing cap and a bearing base.
The advantage of fracture separations resides in the fact that microscopic and macroscopic denticulations form between the fracture separation surfaces of bearing cap and bearing base, which permit an accurately fitting assembly, thereby avoiding sophisticated post-processing steps.
Application of the predetermined fracturing locations is customarily performed by means of a mechanical broaching process or with the aid of laser energy.
It is a drawback in fracture separation that high fracture separation forces must be applied in the case of high-strength materials. The fracture separation force may be reduced, however, if the bearing bore is initially pre-stressed, with the pre-stress acting perpendicularly to the predetermined fracturing locations, and at the same time the bearing bore being excited by preferably harmonic oscillations. Owing to the manifesting workpiece fatigue at the predetermined fracturing location, a crack forms which propagates from the bottom of the predetermined fracturing location in the depth direction, so that the fracture separation force to be applied may be reduced correspondingly.
Such a process for the fracture separation of workpieces, preferably connecting rods, is disclosed in
CA 2,287,140. A connecting rod is retained on external surfaces by contacting workpiece jaws, wherein a pre- stressing force perpendicular to the predetermined fracturing locations is applied to the predetermined bearing cap by a movable tool jaw which is arranged diametrically on the inner peripheral surface of the bearing bore with respect to a second fixed tool jaw.
Secondary pre-stressing forces parallel to the predetermined fracturing locations are generated via two contact surfaces in the fracture separation plane.
Subsequently the contacts each perform an alternating movement in opposite directions, so that two harmonic forces are applied.
As a result, there forms at the bottom of each predetermined fracturing location a respective crack which propagates correspondingly. Finally a dynamic force pulse is applied by the movable workpiece jaw, so that the bearing cap is cracked away.
It is a drawback in this process that the fracture separation force is applied by other means than the pre- stress forces in parallel with the fracture separation plane, or other than the harmonic forces for application of oscillations. This results in a multiplicity of means [File:ANMWMWO0333B1.doc] 26.03.03
PCT/DE02/02826
Mauser-Werke Oberndorf Maschinenbau GmbH
AMENDED SHEET
® necessitating a complex structure in terms of device technology.
A need exists to furnish an apparatus for fracture separating workpieces and a process which eliminate the named drawback, whereby an essentially simplified and economical apparatus and process are defined.
This need is fulfilled through an apparatus having the features of claim 1, and a process having the features of claim 8.
The inventive apparatus for fracture separating workpieces provides for the application both of an alternating dynamic force for generating oscillations and a fracture separation force with the aid of a spreader mandrel which is axially inserted into the bearing bore.
The spreader mandrel is displaceable in a radial direction through at least one spreader jaw and connected to an external oscillating means. The at least one spreader Jaw 1s radially moved alternatingly by the oscillating means so that not only static pre-stress forces but also dynamic forces act on the bearing bore diametrically and perpendicularly to the predetermined fracturing plane, whereby a dynamic strain in the range of the notch bottom is brought about. This results in a fatigue breakage in the range of the notches, so that the fracture separation force required for fracture separation is very low.
It is an advantage of the preferred embodiment that all the forces necessary for fracture separation with oscillation generation are applied with the aid of one means, namely, the spreader mandrel. Thus it is possible to use but one activating means, allowing for more compact design of the fracture separation apparatus altogether, and for reduced costs in manufacturing such a machine. a.
In a preferred process, in the fracture separation of workpieces, e.g. of bearing bores of connecting rods and crankshaft cases, the oscillating means is driven such that optionally the dynamic force precedes the fracture separation force, or that the dynamic force and the fracture separation force coincide. Here the spreader mandrel is being inserted into the bearing bore in such a way that the predetermined bearing cap is cracked away.
Driving the oscillating unit for generating the dynamic force may be accomplished through electrodymamic, electrohydraulic, piezoelectric and electromagnetic exciter means. The frequency of the applied oscillations will here preferably be lower than the natural frequency of the workpiece.
In accordance with one embodiment, the spreader mandrel includes one fixed and one radially movable spreader jaw, with the movable spreader Jaw being actuated by a wedge or other control surface. The spreader mandrel may, however, also include a plurality of radially adjustable spreader jaws.
In order to avoid fracture surfaces extending obliquely to each other, it is advantageous tO use spreader mandrels the spreader jaws gq of which only take effect in the range of notches predetermining the fracture separation plane.
Further preferred embodiments are subject matters of the subclaims. [File:ANM\MWO333B1.doc] 26.03.03
PCT/DEQ2/02826
Mauser-Werke Obermdorf Maschinenbau GmbH
J ol N "5-
A preferred embodiment is explained in more detail in the following schematic representation, wherein:
Fig. 1 is a preferred arrangement of a connecting rod in an apparatus for fracture separating workpieces,
Fig. 2 shows a top view of a connecting rod with a spreader mandrel inserted into a bearing bore, and
Fig. 3 1s a top view of a preferred spreader mandrel inserted into a bearing bore of a connecting rod.
Fig. 1 shows an arrangement of a connecting rod 2 in an apparatus 4 for fracture separating workpieces. The connecting rod 2 is provided in a bearing bore 6 with two diametrical notches or predetermined fracturing locations 10 extending axially at the inner peripheral surfaces 8, so that the bearing bore 6 during fracture separation splits into a bearing base 12 and a bearing cap 14. A spreader mandrel 16 having a fixed spreader jaw 16 and a movable spreader jaw 20 1s inserted axially into a bearing bore 6. The movable spreader jaw 20 is radially displaceable with the aid of a wedge 22 that may be displaced axially between the two spreader jaws 18, 20 and acts as a control surface. The spreader jaws 18, 20 are positioned in the bearing bore 6 such that a fracture separation force FB is applied perpendicularly to the predetermined fracturing locations 10, so that in the fracture separating step the bearing cap 14 is cracked away. I.e., the fixed spreader jaw 18 contacts the bearing base 12, and the movable spreader jaw 20 contacts the bearing «cap 14. In order to avoid plastic deformations and strong elastic deformations during the fracture separating step, the bearing cap 14 is supported by a counter member 24 in a direction orthogonal to the [File:ANMIMWO333B1.doc] 26.03.03
PCT/DE02/02826
Mauser-Werke Oberndorf Maschinenbau GmbH
- ' Cl * i 6 ) fracture separation force FB. The wedge 22 is driven through an oscillating means 26 and displaced axially, so that the movable spreader jaw 20 is radially displaceable. Driving may be performed through electrodynamic, electrohydraulic, piezoelectric and electromagnetic exciter means.
It is, however, also conceivable to use a spreader mandrel having a plurality of spreader jaws displaceable in the radial direction, which are made radially movable with the aid of a radially displaceable cone.
Moreover it is conceivable to employ spreader mandrels wherein radial mobility cf the spreader jaws is brought about hydraulically.
Fig. 2 shows a top view of a connecting rod 2 with a spreader mandrel 16 inserted into the bearing bore 6.
Here a static pre-stressing force FV, a dynamic force FD for oscillation generation, and a pulse-type fracture separation force FB are applied by the spreader mandrel 16. All the forces are directed at the bearing cap 14 radially from the inside, perpendicularly to the fracture separation plane 28, and coincide with each other, wherein the fracture separation force FB may optionally also be set to cccur subsequently.
Setting the pre-stressing force FV to coincide with the dynamic force FD serves for more rapid and effective introduction of a fatigue breakage at the predetermined fracturing locations 10, so that the fracture separation force FB is reduced in comparison with conventional solutions. Owing to the oscillations of the alternating dynamic force FD being applied to the bearing cap 14 in combination with the pre-stressing force FV, radially extending cracks 32 form at the bottom 30 of the {File:ANM\MWO333B1.doc] 26.03.03
PCT/DED2/02826
Mauser-Werke Obemndorf Maschinenbau GmbH
Cia -7- predetermined fracturing locations 10. Apart from the material properties of the workpieces, crack propagation depends on the frequency of the applied oscillation and on the magnitude of the pre-stressing force FV. It has been found that at a frequency in the quasi-static range, i.e. near the natural frequency of the clamped connecting rod, creates a resonance condition which favors crack propagation. Here it is to be noted that the plastic range at the crack tip 34 is small in comparison with the size of a crack.
The fracture separation force FB is applied in accordance with the pre-stressing force FV and the dynamic force FD through axially displacing the wedge. As the pre-stressing force continues into the fracture separation force in a pulse-type manner, the fracture separation force might be considered a maximum value of the pre-stressing force. The fracture separation force is applied either simultaneously with the dynamic force FD for oscillation generation or subsequently to the dynamic force FD. The magnitude of the fracture separation force
FB is selected in accordance with the material properties and the crack 32 which has already propagated.
Fig. 3 shows a top view of a preferred spreader mandrel 16 that is inserted into a bearing bore 6 of a connecting rod 2. In the case of this spreader mandrel 16, the spreader jaws 18, 20 are formed such that they merely contact in the range of the predetermined fracturing locations (notches) 10, while in the intermediate range a cavity 38 between workpiece and spreader jaws 18, 20 1s formed. In other words, the spreader mandrel essentially only contacts the workpiece in the range of the notches 10, while the intermediate ranges are receded. This cavity 38 has the effect of the bearing cap 14 being subjected, in the vicinity of the [File:ANM\MWO33381.doc] 26.03.03
PCT/DE02/02826
Mauser-Werke Obemdorf Maschinenbau GmbH
Coe -8- predetermined fracturing locations 10, to the application of forces FB, FD, FV, so that the bearing cap 14 is kept from "swinging away" owing to elastic deformations. In accordance with the highly reduced elastic deformation, the forces FB, FD, FV predominantly are directed perpendicularly to the fracture separation plane 28, so that fracture surfaces 40 form in the fracture separation plane 28.
Thanks to the intentional selection of force introduction locations, the predetermined fracture surfaces 40 do not form obliquely to the predetermined fracture separation plane 28 and thus not obliquely to each other, but are aligned with the fracture separation plane 28. Thus a settling behavior during/after assembly of the bearing bore 6 is avoided, which has a positive effect particularly in operation later on.
A preferred process for the fracture separation of workpieces provides to introduce two predetermined fracturing locations on a bearing bore which diametrically extend in an axial direction on inner peripheral surfaces, whereby a bearing base and a bearing cap are predetermined. Introduction may be carried out both through a mechanical broaching process and through laser energy. In the bearing bore a spreader mandrel is inserted, wherein the spreader mandrel with its spreader jaws is aligned such that through the application of a fracture separation force to the fracture separation plane in a radial direction, the bearing cap is cracked away. The spreader mandrel is driven such that through the application of a pre-stressing force on the bearing bore, and simultaneously with a dynamic force, a fatigue breakage in the range of the predetermined fracturing locations is brought about. The frequency of the dynamic force preferably is closely below the natural frequency [File:ANM\MWO333B1.doc] 26.03.03
PCT/DE02/02826
Mauser-Werke Oberndorf Maschinenbau GmbH
AMENDED SHEET
® of the system of the connecting rod. Afterwards a fracture separation force is applied which splits the bearing bore into the bearing base and the bearing cap.
The fracture separation force may optionally be set to coincide with the dynamic force or to occur subsequently tc the dynamic force.
The pre-stressing force may be set to be reducing, constant, and increasing. Reducing means that with a continuing crack propagation the pre-stressing force is reduced, constant means that the pre-stressing force is kept at a defined magnitude independently of crack separation, and increasing means that the pre-stressing force is increased with continuing crack propagation.
What is disclosed in an apparatus for fracture separation workpieces, comprising a spreader mandrel which may be inserted into a bearing bore for fracture separation thereof, and which is extendible in a radial direction for the application of a fracture separation force, and oscillating means whereby it is possible to apply to the spreader mandrel an alternating dynamic force set to coincide with or precede the fracture separation force, for generating oscillations in the bearing bore. "Comprises/comprising when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or component or groups thereof.
The claims which follow are to be considered an integral part of the present disclosure. Reference numbers (directed to the drawings) shown in the claims serve to facilitate the correlation of integers of the claims with illustrated features of the preferred embodiment (s), but are not intended to restrict in any way the language of the claims to what is shown in the drawings, unless the 40 contrary is clearly apparent from the context.
Co -10 -
List of reference symbols 2 connecting rod BN 4 apparatus for fracture separating workpieces 6 bearing bore 8 inner peripheral surface predetermined fracturing location 12 bearing base 14 bearing cap 16 spreader mandrel 18 fixed spreader jaw movable spreader jaw 22 wedge 24 counter member 26 oscillating means 28 fracture separation plane bottom of predetermined fracturing location 32 crack 34 crack tip 36 support surface 38 hollow profile 40 fracture surface [File:ANM\WMWO33381.doc] 26.03.03
PCT/DE02/02826
Mauser-Werke Oberndorf Maschinenbau GmbH
Claims (15)
1. Apparatus (2) for fracture separating workpieces, including a spreader mandrel (16) capable of being inserted into a bearing bore (6) for fracture separation thereof and capable of being spread apart for applying a fracture separation force in a radial direction, which includes an oscillating means (26) whereby it is possible to apply to the spreader mandrel (16) an alternating dynamic force for generating oscillations in the bearing bore (6), which force is set to coincide with or precede the fracture separation force, simultaneously with a pre-stressing force for generating oscillations in the bearing bore (6), wherein the fracture separation force may be a maximum value of the pre-stressing force.
2. Apparatus for fracture separating workpieces according to claim 1, wherein the oscillating means (26) 1s formed such that the workpiece may be subjected to application of a dynamic force having a frequency lower than the natural frequency of the clamped workpiece.
3. Apparatus for fracture separating workpieces according to claim 1 or 2, wherein the oscillating means (26) includes an electrodynamic or electrohydraulic or piezoelectric or electromagnetic element for driving the spreader mandrel (16).
4. Apparatus for fracture separating workpieces according to any one of the preceding claims, wherein the spreader mandrel (16) comprises a fixed spreader jaw (18) and a movable spreader jaw (20), the movable spreader jaw (20) being actuated by a wedge (22) or some other control surface.
AMENDED SHEET ®
5. Apparatus for fracture separating workpieces in accordance with any one of claims 1 to 3, wherein the spreader mandrel (16) comprises a plurality of spreader jaws (20) which are movable in the radial direction.
6. Apparatus for fracture separating workpieces in accordance with claim 4 or 5, wherein the spreader mandrel (16) contacts the workpiece (2) in the range of the fracture separation plane and in the intermediate ranges is spaced apart from the adjacent peripheral edge of the workpiece.
7. Apparatus for fracture separating workpieces according to any one of the preceding claims, wherein the workpiece is a connecting rod (4) or a crankshaft case.
8. Process for fracture separation of a workpiece, comprising the steps of: introducing two predetermined fracturing locations (10) for predetermining a fracture separation plane (28) in a bearing bore (6) of a workpiece, inserting a spreader mandrel (16) into the notched bearing bore (6) applying a fracture separation force and fracture separation of the workpiece by extending the spreader mandrel (16) in the radial direction, wherein a spreading movement of the spreader mandrel is controlled such that during or prior to application of a fracture separation force, the workpiece is subjected to application of at least one alternating dynamic force bringing about a fatigue breakage in the range of the predetermined fracturing location (10) simultaneously with a pre-stressing force, wherein the fracture sepration force may be a maximum value of the pre-stressing force.
AMENDED SHEET
®
9. Process for fracture separation of a workpiece according to claim 8, wherein the frequency of the dynamic force is lower than the natural frequency of the workpiece.
10. Process for fracture separation of a workpiece according to claim 8 or 9, wherein the notch is introduced with the aid of a mechanical broaching method or with the aid of laser energy.
11. Apparatus (2) for fracture separating workpieces, including any new and inventive integer or combination of integers, substantially as herein described.
12. Apparatus (2) for fracture separating workpieces according to the invention, as hereinbefore generally described. .
13. Apparatus (2) for fracture separating workpieces as specifically described with reference to or as illustrated in the accompanying drawings.
14. Process according to the invention for fracture separation of a workpiece, substantially as hereinbefore described and exemplified.
15. Process for fracture separation of a workpiece including any new and inventive integer or combination of integers, substantially as herein described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10137975A DE10137975A1 (en) | 2001-08-08 | 2001-08-08 | Breaking separation device has vibration device to act on spreading mandrel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA200301960B true ZA200301960B (en) | 2004-07-01 |
Family
ID=7694177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA200301960A ZA200301960B (en) | 2001-08-08 | 2003-03-11 | Device and method for fracture-separating workpieces. |
Country Status (7)
| Country | Link |
|---|---|
| KR (1) | KR20040029296A (en) |
| CN (1) | CN100402214C (en) |
| BR (1) | BR0205839A (en) |
| DE (1) | DE10137975A1 (en) |
| SE (1) | SE524064C2 (en) |
| WO (1) | WO2003015970A1 (en) |
| ZA (1) | ZA200301960B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1577038A1 (en) * | 2004-03-19 | 2005-09-21 | Alfing Kessler Sondermaschinen GmbH | Method and manufacturing device for producing a split bearing arrangement. |
| DE102004020063A1 (en) * | 2004-04-24 | 2005-11-17 | Man Nutzfahrzeuge Ag | Process for fracture separation of reassemblable components or their materials |
| CN203484729U (en) * | 2011-09-06 | 2014-03-19 | 盖恩度有限公司 | Machine for cracking connecting rod |
| DE102012112539A1 (en) | 2012-03-12 | 2013-09-12 | Mauser-Werke Oberndorf Maschinenbau Gmbh | Method and device for fracture separation of a workpiece |
| DE102013008115B4 (en) * | 2013-05-11 | 2023-12-07 | Neumayer Tekfor Engineering Gmbh | Method for breaking a connecting rod and corresponding device |
| CN106475758A (en) * | 2016-09-20 | 2017-03-08 | 江南大学 | A kind of baiting method being loaded based on low-and high-frequency oscillating load |
| CN107906248B (en) * | 2018-01-02 | 2024-02-02 | 南安市九喜卫浴洁具厂 | Valve body handle convenient to install fast |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3994054A (en) * | 1975-01-06 | 1976-11-30 | Brunswick Corporation | Multiple part tubular member and method and apparatus for manufacture thereof |
| US4569109A (en) * | 1984-07-02 | 1986-02-11 | General Motors Corporation | Method of making a split bearing assembly |
| US4754906A (en) * | 1987-03-11 | 1988-07-05 | Mts Systems Corporation | System for manufacturing connecting rods |
| DE4442062A1 (en) * | 1994-11-25 | 1996-05-30 | Bayerische Motoren Werke Ag | Method for breaking separation of a component in an opening in adjacent cross sections, in particular split bearing arrangements, preferably connecting rods of reciprocating piston machines |
| DE19531365C2 (en) * | 1995-08-25 | 1998-11-05 | Knorr Bremse Systeme | Method of manufacturing a connecting rod, especially for compressors |
| DE19758583C2 (en) * | 1997-08-01 | 2002-05-08 | Kessler Kg Maschf | Device for breaking an annular component |
| DE19733387C2 (en) * | 1997-08-01 | 2003-04-17 | Kessler Kg Maschf | Device for breaking an annular component |
| FR2788819B1 (en) * | 1999-01-26 | 2001-04-13 | Process Conception Ing Sa | DEVICE FOR BREAKING A SINGLE-PIECE METAL CONNECTING ROD |
| DE19911597A1 (en) * | 1999-03-16 | 2000-09-21 | Bayerische Motoren Werke Ag | Device for breaking separation of a component in cross sections provided between component boundaries and an opening, in particular in a split bearing arrangement |
| DE19918063A1 (en) * | 1999-04-21 | 2000-10-26 | Kessler Kg Maschf | Workpiece breaking separation process, involving fixing workpiece, axially introducing spreading device, making break notch and parting spreading device |
| CA2287140C (en) * | 1999-10-13 | 2001-02-13 | Sudip Bhattacharjee | Process to fracture connecting rods and the like with resonance-fatigue |
-
2001
- 2001-08-08 DE DE10137975A patent/DE10137975A1/en not_active Withdrawn
-
2002
- 2002-08-01 BR BR0205839-1A patent/BR0205839A/en active Search and Examination
- 2002-08-01 WO PCT/DE2002/002826 patent/WO2003015970A1/en not_active Application Discontinuation
- 2002-08-01 KR KR10-2003-7004968A patent/KR20040029296A/en not_active Application Discontinuation
- 2002-08-01 CN CNB02802608XA patent/CN100402214C/en not_active Expired - Fee Related
-
2003
- 2003-03-11 ZA ZA200301960A patent/ZA200301960B/en unknown
- 2003-04-02 SE SE0300950A patent/SE524064C2/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| SE524064C2 (en) | 2004-06-22 |
| WO2003015970A1 (en) | 2003-02-27 |
| CN100402214C (en) | 2008-07-16 |
| SE0300950L (en) | 2003-06-04 |
| KR20040029296A (en) | 2004-04-06 |
| BR0205839A (en) | 2003-10-21 |
| DE10137975A1 (en) | 2003-02-20 |
| CN1464806A (en) | 2003-12-31 |
| SE0300950D0 (en) | 2003-04-02 |
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