US3611498A - Press for compressing pulverulent products - Google Patents

Press for compressing pulverulent products Download PDF

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Publication number
US3611498A
US3611498A US835114A US3611498DA US3611498A US 3611498 A US3611498 A US 3611498A US 835114 A US835114 A US 835114A US 3611498D A US3611498D A US 3611498DA US 3611498 A US3611498 A US 3611498A
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US
United States
Prior art keywords
plate
punch
die
core
support plate
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.)
Expired - Lifetime
Application number
US835114A
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English (en)
Inventor
Louis Andre Hedin
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.)
LA METALLURGIE FRANCAISE DES POUDRES-METAFRAM
METALLURGIE FRANCAISE
Original Assignee
METALLURGIE FRANCAISE
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Publication date
Application filed by METALLURGIE FRANCAISE filed Critical METALLURGIE FRANCAISE
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Publication of US3611498A publication Critical patent/US3611498A/en
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Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space

Definitions

  • the invention relates to an improvement to a press for compressing pulverulent products which is very advantageous for manufacturing by sintering mechanical members having zones of different thicknesses.
  • the manufacture of metal members by sintering comprises a first operation during which the powder is compressed in the die by means of a set of top and bottom punches, possibly using cores for members formed with a bore.
  • the mechanical member comprises zones of different thicknesses, measured in the direction of compression
  • punches must be used in a number of independent portions each corresponding to a zone of different thickness of the mechanical member, since to obtain a homogeneous mechanical member, in each of these zones the powder must be subjected to an identical compression rate, so that the compressing stroke is greater in the thickest zones.
  • the bottom punch is floatingi.e., it is mounted on a resilient device allowing it to make a certain movement during compressing which reduces by the same amount the actual compression travel of the top punch.
  • the member In the floating die kind of press, the member is ejected after compression by raising the bottom punches which therefore drive the member out of the die.
  • the same bottom plate acts as a bearing for the fixed bottom punch, the floating bottom punches, their adjusting device and their spring device producing a counterpressure, and also for the cores.
  • This sameplate therefore receives the thrust required for injecting the member after it has been compressed.
  • Adjustment of any one of these members therefore means that the supporting plate must be completely dismantled every time, and this substantially lengthens the time taken to set up the press for the manufacture of a fresh product.
  • the press comprises a floating die-carrying plate resiliently connected to the frame and adapted to move in the direction of compression between adjustable stops; a supporting plate for the bottom punches which bears against a fixed bed-plate connected to the frame, the punch-supporting plate being connected to a lifting device via rigid peripheral rods leaving the central portion of the plate free; a core-supporting plate which is independent and disposed below the punchsupporting plate, which is connected to the frame with facilities for adjustment in the direction of compression, the cores extending into orifices extending through the puinch-supporting plate; a plate supporting the rods for adjusting the floating bottom punches which is independent and is disposed below the core-supporting plate, mounted on a resiliently acting lifting device, the adjusting rods for the floating punches extending into orifices extending through the core-supporting plate, and into corresponding orifices extending through the punch-supporting plate, each
  • FIG. 1 is a sectional view of a typical member which can be produced on the machine to be described hereinafter, which is equipped with the tools required for a member of this shape;
  • FIGS. 2-4 are diagrammatic sections through a floating matrix press according to the invention, showing various phases of the operational cycle of the machine, FIG. 2 corresponding to the end of the phase of filling the die with metal powder, FIG. 3 corresponding to the end of the compressing phasei.e., the maximum compression point, FIG. 4 corresponding to the end of the ejection phase of the compressed member;
  • FIG. 5 corresponds to an adjusting position of the machine
  • FIG. 6 is a detail of the device for simultaneously adjusting the stops of the die-carrying plate.
  • FIG. 7 is a graph showing the operational cycle of the machine and indicating the relative movement of its various moving members.
  • the member shown in section in FIG. 1 is formed with a bore and has two zones h h of different thicknesses, so that the machine will have a two-part bottom punch and a core which extends through the die and engages in the top punch and in one of the bottom punches.
  • a frame 1 takes the compressing force via a transverse bed-plate 2 which is a fixed member of the press framework.
  • a die 3 in which the powder is compressed, is retained in a die-carrying plate 4 bearing against double-acting jacks 5 whose feed pressure p can be adjusted.
  • the plate 4 is guided in its vertical movement by four guide columns (not shown) and by two columns 6 connected to the plate 4 and engaging through bed-plate 2 and in elements of the frame 1.
  • the travel of the plate 4 is limited at the top by nuts 8 which can be adjusted on rods 7, and at the bottom by nuts 9 which can be adjusted on the columns 6.
  • the device for adjusting the nuts simultaneously will be described hereinafter.
  • a punch-supporting plate 10 connected to a plate 12, terminating in a sheath 13, by four rods 11 extending through fixed bed-plate 2.
  • the sheath 12 is connected at a plate 14 to a lever 15 articulated to the frame at a place 16 and connected via a link 17 to the general press-driving mechanism (not shown).
  • a top punch 20, a floating bottom punch 21, and a bottom punch 22 which is fixed during compressing.
  • the bore in the member is produced by a core 23 extending through the punch 22.
  • the floating punch 21 bears against plate 24 via an adjusting rod 25 and a nut and lock-nut assembly 26.
  • a tubular strut 27 bears against the nut and lock-nut assembly 26 and abuts below the punch supporting plate 10 when the plate 24 is in the raised position.
  • the plate 24 is mounted at the end of a sheath 28 sliding in the sheath 13.
  • the sheath 28 is directly connected to a double-acting jack 32 rigidly connected to the frame.
  • a rod 33 Sliding inside the sheath 28 is a rod 33 connected to a double-acting jack (not shown) and adapted to displace the rod 33 in the direction shown by arrow 34.
  • the core-supporting plate is formed by a screw-threaded disc 40 and a plate 41, these members engaging tightly around the heel of the core 23.
  • the disc 40 engages in a tapped bush 42 retained in position in a recess in the bed-plate 2 by a ring 43.
  • the bush 42 is formed with a series of maneuvering apertures 44.
  • nuts 8 engaging on screw threaded rods 7 and forming top stops for limiting the travel of the die-carrying plate 4, bear external teeth 50.
  • the nuts 8 can be adjusted simultaneously in parallel with one another by a screw 51 borne on each side of the press by casings 52 connected to the frame.
  • the screw meshes with a wheel 53 connected via a shaft 54 to a pinion 55 borne by an open casing 56 connected to the frame.
  • Each casing 56 receives a long pinion 57 which meshes with both the pinion 55' and the teeth 50 of the stop-nut 8.
  • the length of the pinion 57 enables the nut 8 to mesh over the whole adjusting travel provided.
  • the nuts 9, which form bottom stops to limit the travel of the plate 4, have a substantially equivalent device for simultaneous and parallel adjustment.
  • the press is in the filling position and the uncompressed powder occupies the Whole space 45 bounded by the die 3, punches 21, 22 and core 23, and is flush with the upper portion of the die.
  • the die carrying plate 4 is kept in its raised position abutting the nuts 8 by the pressure p set up in the double-acting jacks 5.
  • the floating punch 21 is kept in the raised position by a pressure p set up in the jack 32 which keeps the plate 24 raised until the strut 27 abuts the plate 10.
  • the top punch 20 descends and progressively penetrates into the die. As the pressure on the powder increases, the force on the punch 21 increases and finally exceeds the force produced by the pressure 2 in the jack 32; the punch 21 then descends until its heel abuts the plate 10.
  • the die 3 and the die-carrying plate 4 themselves rise until they abut beneath the nuts 8.
  • the die remains fixed, while the punches move the member 46 into the position shown in FIG. 4.
  • the frictional forces can be reduced by leaving the core engaged in the member during the ejection travel, thus obviating friction on the core during this operation.
  • the slight expansion of the member after it leaves the die is reflected back in connection with the core, friction becomes substantially negligible at that place, and the core can be withdrawn very readily.
  • the core-supporting plate 41 is attached to the end of the rod 33, the plate 24 being replaced by a special plate whose centre is formed with an aperture through which the rod 33 extends.
  • a force p is exerted by a jack in the direction indicated by arrow 34 to resist the compressing force and keep the rod 33 and the core 23 immobile, and during ejection, the rod 33 entrains the core 23 in a movement identical with that of the punches and the memberi.e., without the core moving in relation to the member.
  • the withdrawal of the rod 33 brings the core up back into place for the following cycle.
  • FIG. 7 shows the movements as a function of time, operations being performed with a fixed core.
  • the curve 61 shows the movement of the upper plane of the die 3.
  • the curve 60' shows the movement of the lower plane of the top punch 20.
  • the curve. 62 shows the movement of the upper plane of the floating bottom punch 21.
  • the curve 63 shows the movement of the upper plane of the fixed bottom punch 22.
  • the start of the cycle is taken to be the moment T at which the top punch is in its top dead-centre position and in which the space 45 is substantially filled with powder (FIG. 2).
  • FIG. 3 shows the position of the members at the moment T During T and T the rising movement of the punches ejects the member, whereas during the first portion of this period, the die-carrying plate has returned to its raised position under the action of friction and the pressure 2 sets up again in the jack 5.
  • FIG. 4 shows the position of the members at the moment T Between T and T the bottom punches resume their starting position as a result of the force of gravity and the pressure p sets up again in the jack 32, thus enabling the die to be refilled.
  • the independence of the punch-supporting plate, the core-supporting plate, and the plate-supporting the adjusting rods for the floating punches enables each tool to be adjusted separately without affecting the adjustment of the others.
  • the counterpressure on the floating punches is produced by a readily adjustable pneumatic pressure independently of the adjustment of the travel of the floating punches.
  • the scope of the invention is not exceeded by embodiments which differ from the foregoing merely exemplary description only in detail.
  • the pneumatic jacks described could be replaced by hydraulic jacks to control the die-carrying plate or the supporting plate of the adjusting rods.
  • other arrangements might be used for adjusting the core-supporting plate, adjusting the stops of the die-carrying plate or adjusting the floating punches.
  • the ejection plate 21 could be controlled by pneumatic or hydraulic machines, instead of the mechanical control described hereinbefore.
  • a press for compressing pulverulent products comprising a frame, a floating die-carrying plate resiliently connected to said frame, adjustable stops for said plate, a die mounted in said plate, cores for said die, a mobile top punch cooperating with said die, a bottom punch cooperating with said die and fixed in position during compression, floating bottom punches cooperating with said die, a supporting plate for said bottom punches, a fixed bed plate connected to said frame and supporting said supporting plate, a lifting device for said punch supporting plate, rigid peripheral rods connecting said lifting device and said punch supporting plate leaving the central portion of said punch supporting plate free, a core supporting plate independent of and disposed below said punch supporting plate in said frame and fixed in said bed plate, means for adjusting 'the position of said core supporting plate in the direction of compression, said cores extending freely through said punch supporting plate, rods for adjusting the positions of said floating bottom punches, a plate supporting said adjusting rods independent of and disposed in said frame beneath said core supporting plate, a resiliently acting lifting device for said last
  • said resiliently acting lifting device for said support plate for said adjusting rods for said floating punches including a first sheath
  • said lifting device for said punch supporting plate including a second sheath
  • said first sheath being slidably mounted in said second sheath and a double acting jack connected tosaid first sheath.
  • a press as described in claim 1 including a tapped freely rotatable bush fixed in said bed plate, said core supporting plate engaging in said bush.
  • a press as described in claim 2 including a rod slidably mounted in said first sheath end engaging said core supporting plate and a double acting jack connected to said rod.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Press Drives And Press Lines (AREA)
US835114A 1968-08-02 1969-06-20 Press for compressing pulverulent products Expired - Lifetime US3611498A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR161739 1968-08-02

Publications (1)

Publication Number Publication Date
US3611498A true US3611498A (en) 1971-10-12

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ID=8653387

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US835114A Expired - Lifetime US3611498A (en) 1968-08-02 1969-06-20 Press for compressing pulverulent products

Country Status (5)

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US (1) US3611498A (enrdf_load_stackoverflow)
JP (1) JPS5013983B1 (enrdf_load_stackoverflow)
DE (1) DE1938490B2 (enrdf_load_stackoverflow)
ES (1) ES368094A1 (enrdf_load_stackoverflow)
FR (1) FR1581771A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3733154A (en) * 1971-08-17 1973-05-15 Wolverine Pentronix Deflection compensation system for press
US4392800A (en) * 1978-07-24 1983-07-12 Merisinter S.P.A. Press for pulverulent materials
DE3829128A1 (de) * 1988-08-27 1990-03-08 Laeis Gmbh Verfahren zur herstellung von pressformteilen und vorrichtung zur durchfuehrung des verfahrens
US20070062244A1 (en) * 2003-10-29 2007-03-22 Hermann Good Device to receive tools for the calibration of workpieces and press with such a device
US11577310B2 (en) * 2015-09-18 2023-02-14 Gkn Sinter Metals Engineering Gmbh Sintering press with axially controlled deformation, and corresponding method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2951716A1 (de) * 1979-12-19 1981-07-02 Mannesmann AG, 4000 Düsseldorf Verfahren und vorrichtung zum pressen von formkoerpern
CN114211814B (zh) * 2021-12-22 2023-08-04 创一科技(长沙)有限公司 一种压制集成芯片电感的粉末压机
CN114713825A (zh) * 2022-04-12 2022-07-08 江苏天工科技股份有限公司 一种高效率的钛合金电极制备设备

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3733154A (en) * 1971-08-17 1973-05-15 Wolverine Pentronix Deflection compensation system for press
US4392800A (en) * 1978-07-24 1983-07-12 Merisinter S.P.A. Press for pulverulent materials
DE3829128A1 (de) * 1988-08-27 1990-03-08 Laeis Gmbh Verfahren zur herstellung von pressformteilen und vorrichtung zur durchfuehrung des verfahrens
US20070062244A1 (en) * 2003-10-29 2007-03-22 Hermann Good Device to receive tools for the calibration of workpieces and press with such a device
US7494330B2 (en) 2003-10-29 2009-02-24 Alvier Ag Pm-Technology Device to receive tools for the calibration of workpieces and press with such a device
US11577310B2 (en) * 2015-09-18 2023-02-14 Gkn Sinter Metals Engineering Gmbh Sintering press with axially controlled deformation, and corresponding method

Also Published As

Publication number Publication date
JPS5013983B1 (enrdf_load_stackoverflow) 1975-05-23
DE1938490A1 (de) 1970-04-09
DE1938490B2 (de) 1971-05-06
ES368094A1 (es) 1971-05-01
FR1581771A (enrdf_load_stackoverflow) 1969-09-19

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