EP1017527A1 - Continuous extrusion process and device for rods made of a plastic raw material and provided with a spiral inner channel - Google Patents
Continuous extrusion process and device for rods made of a plastic raw material and provided with a spiral inner channelInfo
- Publication number
- EP1017527A1 EP1017527A1 EP97950028A EP97950028A EP1017527A1 EP 1017527 A1 EP1017527 A1 EP 1017527A1 EP 97950028 A EP97950028 A EP 97950028A EP 97950028 A EP97950028 A EP 97950028A EP 1017527 A1 EP1017527 A1 EP 1017527A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle mouthpiece
- nozzle
- raw material
- guide surface
- surface arrangement
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/14—Making other products
- B21C23/147—Making drill blanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/08—Dies or mandrels with section variable during extruding, e.g. for making tapered work; Controlling variation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
- B28B3/26—Extrusion dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/004—Article comprising helical form elements
Definitions
- the invention relates to a method and a device for the continuous extrusion of rods made of plastic raw material with at least one section-wise helical inner channel, according to the preamble of claim 1 and of claim 6.
- Such a method and devices, ie extrusion heads for performing such a method are used for example when a rod blank made of a plasticized powder mass, such as. B. a powder metallurgical mass, ie a hard metal or ceramide mass to a blank, ie a sintered metal or a sintered ceramic blank to be formed from the blank in the form of a cylindrical rod for high performance in a sintering or firing process -Tool is created.
- These blanks are characterized by the tools or powder mixtures used by a very high basic strength, both in terms of mechanical stress and abrasion, so that it has become common practice to use such blanks in particular in the manufacture of drilling or milling tools.
- the method is only economical if the rod can be manufactured in such a way that the geometry and in particular also the position of the at least one internal lubricant or cooling channel is kept within very narrow tolerance limits. This problem is exacerbated when the tool to be produced - as is the case, for example, with a drilling tool - has to be equipped with flutes. Because solid carbide (solid carbide) drilling tools are now being manufactured with relatively large axial lengths, the at least one internal cooling channel must also be molded in so precisely that it comes to lie exactly at the predetermined position of the drill web in each cross section of the drilling tool. This is the only way to ensure that the drill stability is the same over the entire length and that when the tool is regrinded, the mouth of the internal cooling channel remains unchanged in relation to the main cutting edge. Many approaches are already known to
- Document EP 465 946 AI describes a method and a device according to the preamble of claim 1 and claim 5, respectively, with which it is possible to save the process step of external cylindrical grinding of the finished sintered cutting part blanks.
- the inner surface of the nozzle mouthpiece is formed by the outer surface of a circular cylinder.
- a swirl device located within the mass flow is connected upstream of the nozzle mouthpiece.
- a swirling motion which is uniform over the cross section of the strand is forced on the extrusion molding compound by means of this swirl device, while according to the second alternative of the swirling device, a swirling device or rotational movement is forced.
- a thread-like material that follows the swirling or rotating movement protrudes into the mass flow.
- the pitch circle diameter on which the cross section of the at least one internal cooling channel in the extruded blank is located is influenced by the flow velocity and by the friction losses in the nozzle mouthpiece. According to a further variant of this known method, it is therefore proposed that the nozzle mouthpiece be made rotatable, the rotational movement making it possible to correct the rotational movement of the mass flow.
- the invention is therefore based on the object of developing a method according to the preamble of patent claim 1 and a device according to the preamble of patent claim 6 in such a way that the above-mentioned disturbance variables with little effort can be suppressed, so that the manufacturing accuracy is maintained even when system-related parameter fluctuations occur.
- a flow guide surface arrangement is integrated in the nozzle base piece, the inclination of which to the longitudinal axis of the nozzle mouthpiece can be adjusted by an adjusting device, which can preferably be actuated by an external actuating force.
- an adjusting device which can preferably be actuated by an external actuating force.
- the method works in a very material-saving manner, and subsequent expensive processing of the sintered blank can be omitted.
- the blank is extruded with a smooth, circular cylindrical outer surface, which - taking into account the relevant shrinkage - is held in such a way that the least possible material removal occurs during the finishing of the blank. Because the angle of attack of the Flow control surface arrangement can be readjusted at any time during the extrusion process, the helix pitch of the at least one internal channel can be kept within narrow limits not previously achievable, even if the mass flow rate of the plasticized mass and / or other physical conditions of the extrusion process should change.
- a particularly simple embodiment of the flow guide surface arrangement results from the further development of claim 7. It has been shown that the mass flow, which is briefly separated in the peripheral region of the flow when the flow around the guide vane, due to the extremely high pressing pressures prevailing in the nozzle nozzle, is immediate downstream of the guide vane closes again to a full circular cross section. The flow of the mass is thus disturbed as little as possible, as a result of which the structural quality of the blank produced by the method according to the invention can be kept at a very high level.
- the nozzle mouthpiece is attached to the extrusion head in a rotationally fixed manner, it is advantageous if the
- Flow control surface arrangement extends over a significant proportion of the total length of the nozzle mouthpiece. If, on the other hand - according to the further variant of the subject of the application - the nozzle mouthpiece is rotatably held on the extrusion head, the axis of rotation of the central axis of the nozzle mouthpiece coinciding, it is preferable that the flow guide surface arrangement is designed so that it extends only over an axially limited inlet section of the nozzle mouthpiece . This ensures that the induced by the flow control surface arrangement
- Rotational movement of the nozzle mouthpiece is reliably able to maintain or stabilize the self-rotating movement over the residual flow length of the mass flow in the nozzle mouthpiece of the mass via the static friction conditions on the inner wall of the nozzle mouthpiece.
- the flow guide surface arrangement is preferably designed or adapted to the geometry of the nozzle mouthpiece in such a way that the extruded mass flow rotates at the same angular velocity of the nozzle mouthpiece as it exits.
- the adjustment and regulation of the rotational movement of the mass flow becomes even more precise in this way, which has a particularly advantageous effect when the actuating device for the flow guide surface arrangement is integrated into a control circuit of the extrusion device.
- the actuating device for the flow guide surface arrangement has a vibration damping device.
- This vibration damping device is advantageously incorporated into an actuating gear, preferably in the form of a damped elasticity.
- Such a vibration damping device is particularly advantageous if the actuating device is integrated into a control system for the geometry of the at least one internal cooling channel.
- the method according to the invention works using slack or highly elastic threads, which are then fixed in place with their upstream end, preferably in the inlet area of the nozzle mouthpiece.
- threads or inner rods which have a higher modulus of elasticity to increase the dimensional stability, these thin rods or pins then being held on a carrier which is rotatably supported about an axis of rotation which coincides with the axis of the nozzle mouthpiece.
- FIG. 1 shows a schematic cross section through the downstream region of an extrusion head for carrying out the method according to the invention.
- reference numeral 10 denotes an extrusion head with which a method for the continuous extrusion of rods made of plastic raw material equipped with at least one section-wise helical inner channel can be carried out.
- the plastic raw material can e.g. B. consist of a powder metallurgical or ceramic mass, the powder preferably from the group of ceramic powders, the hard metal powder, such as. B. a tungsten carbide-cobalt mixture and the metal powder, and mixtures of these components, such as. B. the ceramide mixtures is selected.
- the figure shows the downstream end of the extrusion head, which tapers in a conical shape, and forms the inlet section 12 of a nozzle mouthpiece 14.
- a holding device Arranged in the inlet section 12, ie in the extrusion head 10, is a holding device, designated 16, on which upstream ends of threads 18 are fixed, with which threads during the extrusion of the plasticized raw material
- Nine lying cooling channels 22 can be generated in the extruded circular cylindrical blank bar 24.
- the threads 18 in the embodiment shown in the figure are made of flexible or highly elastic material, such as. B. made of plastic or from a chain, the chain links movably hang together.
- the threads 18 have a downstream end 18a which extends beyond the end face 26 of the nozzle mouthpiece 14.
- the threads 18 are fastened to the holding device 16 on a pitch circle diameter TKD1, preferably adjustable, in order to adapt to the relevant nozzle mouthpiece 14, i. H. to be able to make the outer diameter D of the blank rod 24 to be produced.
- Arrows S denote the parallel flow of the plasticized powder mass entering the nozzle mouthpiece 14, whereby - as the figure shows - this parallel flow aligns the highly elastic or flexible threads 18 in parallel.
- the nozzle mouthpiece 14 is one
- the arrow R indicates that the guide vanes 28 in question can be adjusted by means of an adjusting device (not shown) such that the angle of attack of the guide vane 28 to the longitudinal axis AL of the nozzle mouthpiece 14 is adjustable, and preferably continuously.
- the figure shows that the adjustment of the guide vanes 28 by an outer Adjustment force can take place, with the result that the setting of the flow guide surface arrangement in the form of the guide vanes 28 can be changed at any time during the extrusion process.
- the reference numeral 36 schematically indicates a bearing via which the nozzle mouthpiece is rotatably attached to the extrusion head 10, in such a way that the axis of rotation coincides with the longitudinal axis AL of the nozzle mouthpiece 14, which has a concentric cylindrical inner bore 38.
- the guide vanes 28 are designed or arranged in the nozzle mouthpiece 14 in such a way that their axial extension EA only makes up a fraction of the overall length LB of the nozzle mouthpiece 14. Furthermore, the downstream edge 40 of the guide vanes 28 is at a minimum distance BA from the outlet end, i. H. from the end face 26 of the nozzle mouthpiece, which is sufficiently large to ensure that the flow of the plasticized mass separated by the guide vanes 28 is closed again to a full circular cross section downstream of the guide vanes 28.
- the plasticized mass enters the inlet section 12 of the nozzle mouthpiece 14 in such a way that it is present as a parallel flow when it enters the nozzle mouthpiece 14.
- This parallel flow now strikes the guide vanes 28 set at the angle of attack ⁇ , via which - due to the flow forces - the nozzle mouthpiece 14 is brought into autorotation.
- the speed of rotation of the nozzle mouthpiece 14 is dependent on the flow rate of the inflowing plasticized mass and on the angle of attack ⁇ .
- the plasticized mass Due to the adhesive condition of the flow passing through the nozzle mouthpiece 14 on the inner surface 38 of the nozzle mouthpiece, the plasticized mass is also set in a rotational movement about the axis AL, the dimension LB ultimately determining the rotational speed at which the plasticized mass leaves the nozzle mouthpiece 14, i.e. . H. at what rotational speed around the axis AL the rod blank 24 emerges from the nozzle blank 14.
- Suitable measures for example air-supported mounting of the emerging rod blank 24, can reliably prevent the pressure-sensitive rod blank 24 from deforming in an impermissible manner during the rotating exit.
- the slack or highly elastic threads 18 are also aligned with the flow of the plasticized mass, ie they are brought into a helical shape by the flow of the plasticized mass passing through, the gradient of which is caused by the angle of attack ⁇ is adjustable in the desired manner.
- the course of the internal cooling ducts 22 as well as the position of the cooling ducts 22, ie the pitch circle diameter TKD2 in the finished extruded blank rod 24, can be exactly defined by the outer adjusting device acting on the guide vanes 28.
- the actuating axes 32 of the guide vanes 28 are preferably part of a central actuating gear, for example in the form of a planetary gear, so that the setting angles ⁇ of the guide vanes can be changed synchronously and uniformly.
- a suitable vibration damping can be provided. This vibration damping is formed, for example, by elastic components with self-damping behavior.
- a measuring and monitoring device for the geometry of the at least one internal cooling channel 22 or for determining the position and the size of the pitch circle diameter TKD2 is advantageously provided in the area of the emerging blank rod 24.
- This measuring and detection device is part of a control circuit in which the corresponding measurement signal is fed back to the actuating device for the guide vanes 28, so that the desired position and geometry of the at least one internal cooling channel 22 are independent of the disturbance variables occurring, such as, for. B. the flow rate and the physical properties of the plasticized mass can be locked.
- the outer adjusting device it is also possible to produce 14 rods with different slopes of the internal cooling channels with one and the same nozzle round piece.
- the flow guide surface arrangement in the form of the guide vanes 28 can be adjusted so that the guide vanes 28 have an angle of attack ⁇ of 0 °, so that a blank rod 24 can be produced with straight internal channels.
- the inventive concept is equally applicable in the event that the nozzle mouthpiece is fixed in rotation on the extrusion head 10.
- the guide vanes 28 which can be set by the adjusting device alone ensure that the plasticized mass entering the nozzle mouthpiece 14 as a parallel flow is set into the desired swirling or rotating movement, the size of which is determined by the adjustable setting angle ⁇ .
- the adjusting device for the flow guide surface arrangement can be integrated into a control system, in which the adjusting device is controlled in accordance with the measurement signals.
- the guide vanes 28 are only shown schematically.
- the guide vanes 28 are only shown schematically.
- Guide vanes 28 flat on the inner surface 38 of the nozzle mouthpiece, with an additional non-positive connection can be provided. It is also advantageous if the guide vanes 28 are designed in such a way that the guide surfaces continuously nestle against the inner wall 38 of the nozzle mouthpiece 14 when the angle of attack ⁇ is adjusted. This is possible, for example, if the guide vanes are made up of links that resiliently press against the inner surface.
- the method according to the invention can be operated with the aid of limited elastic pins which, instead of the threads 18, are fastened to a holding device which is rotatably mounted in the extrusion head about the central axis of the nozzle mouthpiece.
- the pens, i.e. H. the at least one pin can be pre-twisted into a helical shape that already largely corresponds to the helical shape that the at least one internal cooling channel is to have after the extrusion blank has been extruded. It is possible to provide a separate drive for holding this core pin made of a material with a high modulus of elasticity, by means of which a fine adjustment of the spiral course is possible when it is incorporated into a suitable control loop.
- guide vanes 28 it is also possible to vary guide vanes 28 in terms of number, size and arrangement. It is also not absolutely necessary to arrange the guide vanes 28 at a uniform circumferential distance. For reasons of vibration technology, it can make sense to provide an irregular arrangement over the circumference.
- This additional drive can either be provided on the nozzle mouthpiece 14 itself or downstream of this component.
- the invention thus provides a method and an apparatus for the continuous extrusion of at least one, at least partially helical inner channel equipped rods made of plastic raw material, such as. B. a powder metallurgical or ceramic mass.
- plastic raw material such as. B. a powder metallurgical or ceramic mass.
- the plastic raw material is pressed out of a nozzle mouthpiece, whereby it is set into a rotational movement with the aid of a flow guide surface arrangement provided therein, which takes at least one thread made of flexible or elastic material which is held eccentrically upstream of the nozzle mouthpiece and extends through the nozzle mouthpiece and into a helical shape brings with a predetermined slope.
- the invention provides that to adjust the position and / or the slope of the at least one helical inner channel, the rotational movement of the plastic raw material through an external, the adjustment of the flow guide arrangement Adjusting force is adjusted longitudinal axis of the nozzle mouthpiece.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19644447 | 1996-10-25 | ||
DE19644447A DE19644447C2 (en) | 1996-10-25 | 1996-10-25 | Method and device for the continuous extrusion of rods made of plastic raw material equipped with a helical inner channel |
PCT/EP1997/005910 WO1998018587A2 (en) | 1996-10-25 | 1997-10-27 | Continuous extrusion process and device for rods made of a plastic raw material and provided with a spiral inner channel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1017527A1 true EP1017527A1 (en) | 2000-07-12 |
EP1017527B1 EP1017527B1 (en) | 2002-03-13 |
Family
ID=7810013
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97950028A Expired - Lifetime EP1017527B1 (en) | 1996-10-25 | 1997-10-27 | Continuous extrusion process and device for rods made of a plastic raw material and provided with a spiral inner channel |
Country Status (7)
Country | Link |
---|---|
US (1) | US6248277B1 (en) |
EP (1) | EP1017527B1 (en) |
JP (1) | JP3935961B2 (en) |
AT (1) | ATE214317T1 (en) |
DE (2) | DE19644447C2 (en) |
HK (1) | HK1027774A1 (en) |
WO (1) | WO1998018587A2 (en) |
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SE516268C2 (en) * | 1999-06-03 | 2001-12-10 | Seco Tools Ab | Method and apparatus with radially movable jaws for extrusion of rotating tools |
US6726085B2 (en) * | 2002-05-14 | 2004-04-27 | The Boeing Company | Method and apparatus for producing a refined grain structure |
DE10229326A1 (en) * | 2002-06-29 | 2004-01-29 | Arno Friedrichs | Extrusion tool for producing a cylindrical body made of plastic mass |
DE10229325B4 (en) * | 2002-06-29 | 2005-06-09 | Arno Friedrichs | Extrusion tool for producing a cylindrical body consisting of plastic mass |
EP1628795B1 (en) * | 2003-06-04 | 2010-08-18 | Seco Tools AB | Method and device for manufacturing a blank for a tool |
US20060024140A1 (en) * | 2004-07-30 | 2006-02-02 | Wolff Edward C | Removable tap chasers and tap systems including the same |
US8637127B2 (en) | 2005-06-27 | 2014-01-28 | Kennametal Inc. | Composite article with coolant channels and tool fabrication method |
US7687156B2 (en) | 2005-08-18 | 2010-03-30 | Tdy Industries, Inc. | Composite cutting inserts and methods of making the same |
WO2007127680A1 (en) | 2006-04-27 | 2007-11-08 | Tdy Industries, Inc. | Modular fixed cutter earth-boring bits, modular fixed cutter earth-boring bit bodies, and related methods |
MX2009003114A (en) | 2006-10-25 | 2009-06-08 | Tdy Ind Inc | Articles having improved resistance to thermal cracking. |
US7846551B2 (en) | 2007-03-16 | 2010-12-07 | Tdy Industries, Inc. | Composite articles |
DE102007042280A1 (en) * | 2007-09-06 | 2009-03-12 | Komet Group Holding Gmbh | Drilling tool for machine tools and method for its production |
EP2653580B1 (en) | 2008-06-02 | 2014-08-20 | Kennametal Inc. | Cemented carbide-metallic alloy composites |
US8790439B2 (en) | 2008-06-02 | 2014-07-29 | Kennametal Inc. | Composite sintered powder metal articles |
US8322465B2 (en) * | 2008-08-22 | 2012-12-04 | TDY Industries, LLC | Earth-boring bit parts including hybrid cemented carbides and methods of making the same |
US8025112B2 (en) | 2008-08-22 | 2011-09-27 | Tdy Industries, Inc. | Earth-boring bits and other parts including cemented carbide |
US8272816B2 (en) | 2009-05-12 | 2012-09-25 | TDY Industries, LLC | Composite cemented carbide rotary cutting tools and rotary cutting tool blanks |
US8308096B2 (en) | 2009-07-14 | 2012-11-13 | TDY Industries, LLC | Reinforced roll and method of making same |
EP2298491B1 (en) * | 2009-09-22 | 2017-06-28 | Firma Gühring oHG | Tool with coolant channels |
US9643236B2 (en) | 2009-11-11 | 2017-05-09 | Landis Solutions Llc | Thread rolling die and method of making same |
DE102010019599A1 (en) | 2010-05-05 | 2011-11-10 | Gühring Ohg | Powder metallurgical steel |
US8596935B2 (en) | 2010-10-08 | 2013-12-03 | TDY Industries, LLC | Cutting tools and cutting inserts including internal cooling |
US9180650B2 (en) | 2010-10-08 | 2015-11-10 | Kennametal Inc. | Cutting tool including an internal coolant system and fastener for a cutting tool including an internal coolant system |
CN102152491A (en) * | 2010-11-26 | 2011-08-17 | 昆明理工大学 | Equipment and method for continuously producing indefinitely long bar with multiple internal spiral cooling holes |
US8800848B2 (en) | 2011-08-31 | 2014-08-12 | Kennametal Inc. | Methods of forming wear resistant layers on metallic surfaces |
US9016406B2 (en) | 2011-09-22 | 2015-04-28 | Kennametal Inc. | Cutting inserts for earth-boring bits |
CN103252679A (en) * | 2013-05-20 | 2013-08-21 | 苏州瑞森硬质合金有限公司 | Efficient spiral-shaped inner cooling bar for machining cutting knife |
JP6491735B1 (en) * | 2017-12-22 | 2019-03-27 | 本田金属技術株式会社 | Sintered product manufacturing method and sintered product |
DE102018202941B4 (en) * | 2018-02-27 | 2024-01-25 | Kennametal Inc. | Process for producing a blank from extrusion mass and extruder |
DE102018118275A1 (en) * | 2018-07-27 | 2020-01-30 | Valeo Siemens Eautomotive Germany Gmbh | Rotor assembly for an electric machine, electric machine for a vehicle and vehicle |
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US2174779A (en) * | 1937-12-16 | 1939-10-03 | George Morrell Corp | Apparatus for extruding varicolored plastics |
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AT400687B (en) * | 1989-12-04 | 1996-02-26 | Plansee Tizit Gmbh | METHOD AND EXTRACTION TOOL FOR PRODUCING A BLANK WITH INNER BORE |
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JPH06293902A (en) * | 1993-04-08 | 1994-10-21 | Hitachi Metals Ltd | Sintering material having spiral small hole and its rotation-controlled extrusionmolding method |
-
1996
- 1996-10-25 DE DE19644447A patent/DE19644447C2/en not_active Expired - Fee Related
-
1997
- 1997-10-27 JP JP52003398A patent/JP3935961B2/en not_active Expired - Lifetime
- 1997-10-27 DE DE59706644T patent/DE59706644D1/en not_active Expired - Lifetime
- 1997-10-27 US US09/284,945 patent/US6248277B1/en not_active Expired - Lifetime
- 1997-10-27 WO PCT/EP1997/005910 patent/WO1998018587A2/en active IP Right Grant
- 1997-10-27 EP EP97950028A patent/EP1017527B1/en not_active Expired - Lifetime
- 1997-10-27 AT AT97950028T patent/ATE214317T1/en active
-
2000
- 2000-08-21 HK HK00105258A patent/HK1027774A1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
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See references of WO9818587A2 * |
Also Published As
Publication number | Publication date |
---|---|
ATE214317T1 (en) | 2002-03-15 |
WO1998018587A2 (en) | 1998-05-07 |
EP1017527B1 (en) | 2002-03-13 |
JP2002514138A (en) | 2002-05-14 |
JP3935961B2 (en) | 2007-06-27 |
US6248277B1 (en) | 2001-06-19 |
HK1027774A1 (en) | 2001-01-23 |
DE59706644D1 (en) | 2002-04-18 |
DE19644447C2 (en) | 2001-10-18 |
DE19644447A1 (en) | 1998-04-30 |
WO1998018587A3 (en) | 2002-11-21 |
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