EP1602472A1 - Procédé et installation pour la préparation d'une pièce compactée à partir de poudre - Google Patents

Procédé et installation pour la préparation d'une pièce compactée à partir de poudre Download PDF

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Publication number
EP1602472A1
EP1602472A1 EP05008976A EP05008976A EP1602472A1 EP 1602472 A1 EP1602472 A1 EP 1602472A1 EP 05008976 A EP05008976 A EP 05008976A EP 05008976 A EP05008976 A EP 05008976A EP 1602472 A1 EP1602472 A1 EP 1602472A1
Authority
EP
European Patent Office
Prior art keywords
die
die sleeve
wall
powder
space
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
Application number
EP05008976A
Other languages
German (de)
English (en)
Other versions
EP1602472B1 (fr
Inventor
Matthias Holthausen
Martin Zingsem
Guido Schröges
Rolf Vest
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Group GmbH
Original Assignee
SMS Meer GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SMS Meer GmbH filed Critical SMS Meer GmbH
Publication of EP1602472A1 publication Critical patent/EP1602472A1/fr
Application granted granted Critical
Publication of EP1602472B1 publication Critical patent/EP1602472B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/022—Moulds for compacting material in powder, granular of pasta form
    • B30B15/024—Moulds for compacting material in powder, granular of pasta form using elastic mould parts
    • 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
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • 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
    • B22F3/02—Compacting only
    • B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
    • B22F3/045—Semi-isostatic pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/007—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a plurality of pressing members working in different directions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B7/00—Presses characterised by a particular arrangement of the pressing members
    • B30B7/04—Presses characterised by a particular arrangement of the pressing members wherein pressing is effected in different directions simultaneously or in turn
    • 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
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • B22F2003/033—Press-moulding apparatus therefor with multiple punches working in the same direction

Definitions

  • the invention relates to a device for producing a molded part from powder, in particular metal powders, of doughy material containing a powder, from a powder-containing, flowable material or from pre-pressed Material that has: a matrix consisting of a main body and one in these used Matrizenhülse, the Matrizenhülse a preferably at least partially cylindrical contour having a molding surface forms for the molding, and at least one ram, in the by the preferably cylindrical contour of the die sleeve defined opening enter and in the space defined by the preferably cylindrical contour Powder or material can compact. Furthermore, the invention relates to a Method for producing a molded part.
  • stamps can move in an axial direction.
  • the stamps can be in an axial Submerge mold closed on one side or axially in both directions open die come from both axial directions. Occasionally are also used through mandrel rods, but primarily no compression function, but have a positive displacement function.
  • the stamps can also dive laterally into the matrix to undercuts or other geometric To produce characteristics. To demould the molding these radially dipping stamps so far withdrawn that the demolding not hindered.
  • the die usually consists of a die ring (matrix base body) and a Matrizenbuchse or sleeve inserted therein with the workpiece contour.
  • a die ring matrix base body
  • a Matrizenbuchse or sleeve inserted therein with the workpiece contour.
  • the resulting molded part gives way plastically. Does the radial pressure of the Die reaches the yield point corresponding to the current stress state, ends the plastic evasion; there remains an elastic tension between Pressed body and die.
  • the elastic tension causes high friction forces during removal of the molded part from the matrix. These frictional forces lead to wear of the die and to Damage to the molding.
  • the size of the Springback depends on the flow limit of the molded part. at using the same powder mixture, the yield strength increases with height the press force. This results in a dependence of the geometry of the formed Shaped part of the maximum applied punch force.
  • the Springback is the larger, the more elastic the die is. Because carbide a much higher Modulus of elasticity as steel has become to the reduction of the Springbacks therefore female bushes made of carbide used.
  • the Powder added a lubricant.
  • This lubricant influences depending the addition amount more or less adversely affects the density of the molding. As a result, in turn, the strength of the finished molded part is reduced. The more Lubricant is added, the lower the density and strength of the Molding.
  • EP 1 097 801 A1 discloses to provide a device in which to achieve a compact design a hydraulic element with a piezo actuator cooperates.
  • the invention is in the light of the pressing problems described above and demolding the molded part from the die therefore the task, to develop a device of the type mentioned at the outset so that it is possible to facilitate the pressing and demolding and thus the overall powder pressing process to improve. Furthermore, possibilities should be created To design the process of powder molding so that an improvement the process and the product become possible.
  • the means of at least one actuating element that exist between a wall of space in the main body the die and the outer or inner wall of the Matrizenhülse a preferably can generate radially directed force, as well as from at least one pressure transmitting member, the force generated by the actuator on the outside or Inner wall of the matrix sleeve transmits
  • the actuating element is a hydraulic Piston-cylinder system is. Furthermore, it then suggests that a number Actuators and associated pressure transmitting members over the circumference the wall of the space in the body of the matrix are arranged.
  • the pressure transmission links can be designed as a plunger that is attached to taper their end facing the outer or inner wall of the Matrizenhülse end or broaden.
  • the pressure transmission members so taper, that their ends facing the outer wall of the Matrizenhülse adjacent to each other the circumference of the outer wall of the Matrizenhülse largely or completely embrace. This is the preferred procedure in the production a substantially cylindrical shaped body.
  • the pressure transmission members widen so that their the inner wall of the Matrizenhülse facing ends adjacent the circumference of the inner wall of the die sleeve largely or completely embrace. This is the preferred procedure in the production a substantially annular shaped body.
  • An embodiment of the invention is that a single actuator is provided, the one preferably concentric with the die sleeve trained, sealed to the environment space (ie an annulus), and an element with which a hydraulic fluid under a predetermined pressure and / or entered into the room at a predetermined volume flow can, wherein at the preferably radially inwardly or outwardly directed end surface of the room adjoin a number of pressure transmitting members.
  • the pressure transmission members can be provided that between the radial inwardly or outwardly facing end surface of the space and the pressure transmitting members an elastic band is arranged.
  • the tape is preferred as Steel sleeve formed with a small thickness.
  • the Matrizenhülse may be made of several parts and composed of several Segments exist.
  • a further embodiment of the invention sees vor that along the direction of movement of the press die or in more than in a plane perpendicular to this direction separately controllable or operable Means are arranged, with which the force at least on a part of the outer or Inner wall of the die sleeve can be applied.
  • Another embodiment of the method provides that before insertion at least one press ram in the die sleeve of the die preferably radial compression or widening of the female sleeve takes place and before the Removal of the molded part from the Matrizenhülse the decompression or relaxation he follows.
  • a particularly advantageous way to compensate for the wear can be by providing a sequence of procedures prior to Insertion or during the insertion of at least one press ram in the die sleeve of the die preferably radial compression or widening the die sleeve takes place in such a way that a molding surface of the die sleeve, preferably an inner cylindrical molding surface, a desired caliber dimension accepts. With the preferably radial deformation can then wear be compensated.
  • Another variant of the method provides that several along the direction of movement the press die in more than one plane perpendicular to arranged in this direction means for applying a force to at least one Part of the outer or inner wall of the die sleeve so controlled or actuated be that along the direction of movement of the or a punch Time-variant course of the compression or expansion of the Matrizenhülse followed by Decompression or relaxation takes place. It can in particular be provided that the time-variant course of the compression or expansion the Matrizenhülse with subsequent decompression or relaxation along the direction of movement of the press die or waves takes place.
  • An advantageous method measure provides that the die sleeve of actuators locally different levels are applied.
  • the actuators can be a bending deformation with in addition larger Deformation and create circumferential waves. For the compact results a uniform deformation result.
  • the inventive method can be further optimized by the Process by heat, by vacuum and by special lubricants, binders and Rieselstoff is supported.
  • the method can also be used in particular for multilevel and multilayer moldings are used.
  • the caliber of the matrix is including the theoretical sintering shrinkage set during sintering based on the finished dimension. In case of deviations If necessary, post-processing to the desired final dimension is required required for sintering. This can be done with the device according to the invention appropriate application of a radial force can be compensated.
  • a device is shown schematically, with which a metal powder 15 can be pressed into a molded part.
  • the device has a die 1, which consists of a hollow cylindrical base body 2, into which a die sleeve 3 is coaxially inserted. So that the die sleeve 3 is highly resistant to wear, it preferably consists of hard metal.
  • the die sleeve defines a cylindrical molding surface 4.
  • the metal powder 15 is introduced into the space formed by this molding surface.
  • a respective ram 5 are inserted into the respective openings of the die sleeve 3 and axially moved towards each other. In this case, a pressing force F P is exerted on the punches 5, so that the powder 15 is compressed.
  • the overall device for powder pressing is shown in FIG.
  • a base frame 16 stamping cylinders 17 are installed, which act on the press ram 5 with the pressing force F P to press the shaped body 18.
  • pressure sensors 19 and 20 and displacement sensors 21 and 22 are present. Further, a radial displacement sensor 23 provided with the radial position of the wall of the Matrizenhülse 3 can be determined.
  • the controller 24 initiates the process of the manufacturing process.
  • FIGS. 4a and 4b A first embodiment of this concept is shown in FIGS. 4a and 4b.
  • the means 8 for generating the radially directed force F R of the space 7 itself which is designed as a sealed or sealed space for receiving hydraulic fluid.
  • the hydraulic fluid Via a hydraulic fluid input member 9 (pump not shown), the hydraulic fluid is led into the space 7 or 8 (here, there are two sub-spaces staggered in the axial direction of the die 1) where there is expansion of the space and thus causes a radial compression of the die sleeve 3.
  • the reference numeral 9 also designates the hydraulic fluid or the line and the elements for influencing the hydraulic fluid with respect to pressure and / or volumetric flow.
  • This embodiment is very simple, but requires high pressures p to work efficiently.
  • the die sleeve 3 should be designed as thin as possible here become. It is also important that the extension of the space 7 in the axial direction is big enough.
  • FIGS. 5a and 5b Another type can be seen in FIGS. 5a and 5b.
  • an actuating element 10 in the form of a piston-cylinder system is provided for acting on the die sleeve 3 with the radial force F R.
  • the piston is acted upon by an element 9 for inputting hydraulic fluid (see above) with fluid predetermined pressure p, which urges him from the wall 11 radially inwardly.
  • the force generated by the hydraulic fluid is transmitted to a pressure transmitting member 12 which transmits the force to the outer wall 6 of the die sleeve 3 and thus radially compresses them.
  • the pressure transmission links 12 - designed as a plunger - rejuvenate it so in the direction of the die sleeve 3, that their ends together the circumference the die sleeve 3 completely surrounded. This is done in an advantageous manner achieved that it to a uniform radial compression of the sleeve. 3 comes.
  • Figs. 6a and 6b an embodiment similar to that in Figs Figures 5a and 5b.
  • the actuators 10 - formed here as a piston-cylinder systems - in the Area of the main body 2 of the die 1 are set back behind the space 7.
  • a further increase in the pressure force by the actuators 10 is with a variant possible, as shown in Figures 7a and 7b.
  • Piston-cylinder systems are used, which work with two pressure chambers and thus can generate a significantly higher force. It is about a Solution in which a series connection of several piston surfaces takes place to to increase the powers; the effective piston area is thus increased.
  • FIGS 8a and 8b One of the filigree structure of the arrangements shown in Figures 5 to 7 different version is shown in Figures 8a and 8b. It will only be one formed only sealed annular space 13, which via an element 9 with hydraulic fluid is supplied. Adjacent to the end surface 14 of this space 13 is a number of pressure transmission members 12, which in the admission of the space thirteenth with hydraulic fluid and in the subsequent expansion of the space 13th be pressed radially inward and so compress the die sleeve 3 radially.
  • the end surface 14 is quite large, so that it is also the adjacent Can be surfaces of the pressure transmitting members 12. This will be also the radial force, which passed from the pressure transmitting members 12 becomes.
  • FIGS. 9a and 9b it is shown that, at the expense of bending and while maintaining the Abzieh Structure above by an extension of the hydraulic chamber down a larger pressurization area can be achieved.
  • Figures 10a and 10b show an embodiment with different piston-cylinder elements in the application for the production of an elongated Molding.
  • an alternative embodiment of the invention is to see, in the not - as in the above solutions - a radially inward directed pressure is exerted on a cylindrical shaped body, but at which is about the production of a ring-shaped compact.
  • a die 1 which is an outer hollow cylindrical basic body part. 2 identifies as well as an inner cylindrical basic body part 2, which at the radial outer surface adjacent to the die sleeve 3.
  • FIGs 12a and 12b a further embodiment of the invention is to see.
  • a number of pressure transmitting members 12 with their respective actuators 10 in the direction of movement of the press die or 5 are arranged one above the other.
  • the individual actuators 10 can be operated separately or in groups.
  • Fig. 12b to see that are entered at different locations hydraulic fluid can, which is indicated by the reference numerals p1, p2 and p3. So that can be achieved that the centrally arranged die sleeve 3 along its Longitudinal axis are subjected to different compression forces can.
  • Fig. 12a is shown enlarged how - by appropriate control of the causes various actuators 10 - the die sleeve 3 deformed and with it also the powder inside it.
  • the actuating elements 10 can be controlled in particular in such a way that one or more compression waves along the circumference of the Matrizenbuchse 3, along the die sleeve 3 in the direction of the axis of the ram 5 or in a superposition of both movements on the die sleeve 3 in the Powder are introduced.
  • the proposed approach is suitable in the axial direction of the die To produce 1 longer pellets than was previously the case.
  • By the Wall friction reduces the pressure on the powder with increasing length. Due to the possibility of wall friction due to the radial movement of the die sleeve 3 to reduce drastically despite concern of a high axial pressure succeeds it now, to drive the axial pressure much further into the compact.
  • a special mode of operation of this arrangement is in a hydraulic control, which is determined by a specific order of pressurization or a pulsating Characterized by pressurization with phase offset for the individual zones (analogous to the wiring of a three-phase motor or a three-phase linear motor).
  • Such regional wiring can also be radial or in other preferred directions be applied. This can be complicated especially when molded parts to solve local filling and compaction problems.
  • Fig. 13 shows a variant in which the die sleeve 3 with the punch forces P 1 to P 6 is acted upon locally different, bringing a for the compact achieve uniform deformation result, with a pressure curve, such as he is outlined in the diagram of FIG. 14.
  • the hydrostatic compression is a particularly favorable Type of compression, as an all-round compression of the powder takes place.
  • the for such a compression required radial movement of the die sleeve 3 below Use of funds 8, however, usually exceed the possibilities described Elements. Therefore, the radial movement of the means 8 and the appropriate radial compression of the die sleeve 3 are used so that the greatest possible benefit can be drawn.
  • a permanent active control allows the greatest possible influence on the process of manufacturing the molding. But also waiving elaborate Controls can be compared to significant improvements of the process with known methods - realize.
  • the exact parameters of the Procedures are to be defined in the individual process. The freedom of choice of parameters is determined by the available radial forces as well as the amount of permissible elastic elongation of the die sleeve limited. Further attention must be paid Be sure that the press punches are not jammed during the movement be allowed. In the resting state, however, they may be pressed radially. They dodge elastically inwards. The tool gap must not be too get big, because then powder can get between the ram.
  • the molded part is transversely deformed in a phase in which the axial force is low. This can lead to cracks and damage. This injury of the molded part by the transverse deformation can be significantly reduced, if the active transverse deformation takes place under high pressure.
  • the "active matrix” offers now the possibility, with a rigid form in the main, for that perform necessary radial movement controlled.
  • a standard die has an effect when switching presses Relieves the lateral elastic spring back of the die destructively on the Molded part.
  • An improvement can already be achieved by the Matrizenin be acted upon with force so that the contact surface for Powder remains rigid in its position unchanged.
  • a favorable flow for the molding consists in an axial compression up to maximum axial pressing force.
  • the default template is due their elasticity during load change of the press ram of presses on unloading a springback. It finds a radial deformation at low axial stress instead of. There may be internal sliding in the molded part, which is the Can damage the molded part.
  • the control force can be applied so that the inner contour of the template sleeve seemingly is rigid. The risk of damage to the molding is thereby significantly reduced.
  • the invention is also used, if not, d. H. if the shaped body is not cylindrical is formed, not even in sections, and thus the die sleeve alike does not have a cylindrically shaped section.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Press Drives And Press Lines (AREA)
  • Powder Metallurgy (AREA)
EP05008976.2A 2004-06-02 2005-04-23 Procédé et installation pour la préparation d'une pièce compactée à partir de poudre Active EP1602472B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004026968 2004-06-02
DE102004026968A DE102004026968A1 (de) 2004-06-02 2004-06-02 Vorrichtung und Verfahren zum Herstellen eines Formteils

Publications (2)

Publication Number Publication Date
EP1602472A1 true EP1602472A1 (fr) 2005-12-07
EP1602472B1 EP1602472B1 (fr) 2014-03-19

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EP05008976.2A Active EP1602472B1 (fr) 2004-06-02 2005-04-23 Procédé et installation pour la préparation d'une pièce compactée à partir de poudre

Country Status (4)

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US (1) US7150851B2 (fr)
EP (1) EP1602472B1 (fr)
CA (1) CA2508528C (fr)
DE (1) DE102004026968A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1852247A2 (fr) * 2006-05-02 2007-11-07 Fette GmbH Presse destinée à la fabrication de comprimés en matériau poudreux
CN109396424A (zh) * 2018-11-23 2019-03-01 南京宁阪特殊合金有限公司 球化剂压块的制备方法
CN114799166A (zh) * 2022-05-11 2022-07-29 余姚市盛达粉末冶金有限公司 一种粉末冶金生产系统及工艺

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007109774A2 (fr) * 2006-03-22 2007-09-27 3M Innovative Properties Company Milieu filtre
US8033805B2 (en) 2007-11-27 2011-10-11 Kennametal Inc. Method and apparatus for cross-passageway pressing to produce cutting inserts
US8062014B2 (en) * 2007-11-27 2011-11-22 Kennametal Inc. Method and apparatus using a split case die to press a part and the part produced therefrom
EP2098317A1 (fr) * 2007-12-04 2009-09-09 Osterwalder AG Procédé et dispositif de fabrication d'une pièce moulée en poudre de métal
CH710828B1 (de) * 2015-03-05 2019-06-28 Dietmar W Kramer Dr Sc Techn Eth Phd Pulverpresse sowie ein Futtergehäuse mit vorzugsweise mehreren für ein Querpressen verschiebbaren Stempeln.
CN110815926A (zh) * 2018-08-08 2020-02-21 马会峰 全自动饼式压榨机组脱圈清边机
CN110976856B (zh) * 2019-12-27 2021-11-09 哈尔滨工程大学 一种金属粉末成形装置

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DE19508952C2 (de) 1995-03-13 1998-04-16 Schwaebische Huettenwerke Gmbh Preßvorrichtung zur Erzeugung eines Formteils und entsprechendes Formteil
DE19722779A1 (de) 1997-06-02 1998-12-03 Hoechst Ag Formkörper aus texturiertem Supraleitermaterial und Verfahren zu ihrer Herstellung
DE19830601A1 (de) 1998-07-09 2000-03-09 Friedrich Tilman Hes Formvorrichtung zur Herstellung homogener Formteile
EP1097801A1 (fr) 1999-11-04 2001-05-09 Itt Manufacturing Enterprises, Inc. Entraínement piézoélectrique de presse avec dispositif de transmission hydraulique
US6324970B1 (en) 1997-11-20 2001-12-04 Murata Manufacturing Co., Ltd. Device for pressing a ceramic stacked layer structure
WO2002032655A1 (fr) 2000-10-17 2002-04-25 Aktiebolaget Skf Dispositif de compression de poudre

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DE19508952C2 (de) 1995-03-13 1998-04-16 Schwaebische Huettenwerke Gmbh Preßvorrichtung zur Erzeugung eines Formteils und entsprechendes Formteil
DE19722779A1 (de) 1997-06-02 1998-12-03 Hoechst Ag Formkörper aus texturiertem Supraleitermaterial und Verfahren zu ihrer Herstellung
US6324970B1 (en) 1997-11-20 2001-12-04 Murata Manufacturing Co., Ltd. Device for pressing a ceramic stacked layer structure
DE19830601A1 (de) 1998-07-09 2000-03-09 Friedrich Tilman Hes Formvorrichtung zur Herstellung homogener Formteile
EP1097801A1 (fr) 1999-11-04 2001-05-09 Itt Manufacturing Enterprises, Inc. Entraínement piézoélectrique de presse avec dispositif de transmission hydraulique
WO2002032655A1 (fr) 2000-10-17 2002-04-25 Aktiebolaget Skf Dispositif de compression de poudre

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1852247A2 (fr) * 2006-05-02 2007-11-07 Fette GmbH Presse destinée à la fabrication de comprimés en matériau poudreux
EP1852247A3 (fr) * 2006-05-02 2010-07-07 Fette GmbH Presse destinée à la fabrication de comprimés en matériau poudreux
CN109396424A (zh) * 2018-11-23 2019-03-01 南京宁阪特殊合金有限公司 球化剂压块的制备方法
CN109396424B (zh) * 2018-11-23 2019-10-29 南京宁阪特殊合金有限公司 球化剂压块的制备方法
CN114799166A (zh) * 2022-05-11 2022-07-29 余姚市盛达粉末冶金有限公司 一种粉末冶金生产系统及工艺
CN114799166B (zh) * 2022-05-11 2024-04-26 余姚市盛达粉末冶金有限公司 一种粉末冶金生产系统及工艺

Also Published As

Publication number Publication date
US7150851B2 (en) 2006-12-19
EP1602472B1 (fr) 2014-03-19
CA2508528A1 (fr) 2005-12-02
US20050269729A1 (en) 2005-12-08
CA2508528C (fr) 2009-07-21
DE102004026968A1 (de) 2006-01-05

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