US3647332A - Hydraulic press - Google Patents
Hydraulic press Download PDFInfo
- Publication number
- US3647332A US3647332A US854222A US3647332DA US3647332A US 3647332 A US3647332 A US 3647332A US 854222 A US854222 A US 854222A US 3647332D A US3647332D A US 3647332DA US 3647332 A US3647332 A US 3647332A
- Authority
- US
- United States
- Prior art keywords
- punch
- die
- platen
- platens
- article
- 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
Links
- 239000012530 fluid Substances 0.000 claims abstract description 25
- 125000006850 spacer group Chemical group 0.000 claims description 31
- 239000012254 powdered material Substances 0.000 claims description 16
- 238000000465 moulding Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000012255 powdered metal Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002028 premature Effects 0.000 abstract description 2
- 230000000717 retained effect Effects 0.000 abstract description 2
- 239000000843 powder Substances 0.000 description 21
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000005056 compaction Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- 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
- ABSTRACT A hydraulic press having upper and lower hydraulically actuated punches which are moved toward each other in a die containing powdered metal, the upper punch and die having interengageable positive stops and the upper and lower punches having interengageable positive stops so that the powdered metal is compressed by the punches to form an article of precise size.
- the downward force of the upper punch exceeds the upward force of the lower punch to assure engagement of the upper punch and die stops and to prevent premature upward movement of the upper punch out of the die.
- the press has control valves operative to cause upward movement of the punches in unison with respect to the die while the upper and lower punch stops are retained in engagement, thus to strip or eject the article from the die.
- a press which has multiple lower punches pressure control valves set at selected pressures control the upward and downward sequence of operation of the lower punches respectively to produce an article of uniform density and to effect stripping or ejection of the article from the lower punches without chipping off comers of the article.
- Multiple fluid motors of different sizes may be selectively coupled to multiple lower punches according to the sizes of the punches.
- one punch defining one end portion of the article is inserted into a die and is backed up against retraction by a removable stop, and another punch defining the other end portion of the article is hydraulically actuated to compress the powder against said one punch whereby the size of the compacted article is determined by the hydraulic pressure and the initial volume or weight of powder in the die.
- the end to end dimensions of the compacted article may vary substantially, and when the compacted article is to be stripped or ejected from the die, the removable stop is disengaged from said one punch whereby continued actuation of said another punch pushes the compacted article out of the die while the released punch is correspondingly moved by the article itself.
- the back pressure of the released punch due to gravitational and/or frictional forces applies compressive load on the compacted article as it emerges unsupported by the die which is apt to cause breakage or disintegration of the then mechanically weak article.
- opposed punches are moved toward each other and into the die cavity to form the molded article, both punches engaging an interposed spacer member to limit travel of the punches toward each other, and both punches and the spacer member while so engaged being movable in one direction for ejecting the article from the molding cavity to thereby avoid compressively loading that portion of the article not supported by the die during ejection, this constituting a principal object of this invention.
- Another object of this invention is to provide a hydraulic press of the character indicated wherein a plurality of punchactuating cylinders are operated in desired sequence by varying the counterbalance or back pressure so that the cylinder with the lowest counterbalance pressure is first actuated so that its plunger presses the powder to predetermined extent, whereupon as the reaction pressure builds up to that of the cylinder with the next higher counterbalance pressure is actuated so that its plunger commences to press on the powder, etc.
- FIG. 1 is a front elevation view of a hydraulic press embodying the present invention
- FIG. 2 is a side elevation view as viewed along the line 2-2, FIG. 1;
- FIGS. 3 to 6 are horizontal cross section views taken along the lines 3-3, 4-4, 5-5, and 6-6 of FIG. 1, respectively;
- FIGS. 7 to are diagrammatic views illustrating the relative positions of the press parts during the making of a powdered metal article
- FIGS. 11 to 13 are diagrammatic view's illustrating operation of the press in such manner that, after filling of the die with a predetermined amount of powder, the die cavity is enlarged so that the level of the powder is beneath the top of the die as is desirable in forming an article having a recess in its upper end, thus to prevent spilling over of the powder when the upper punch enters the die;
- FIG. 14 is a cross section view of a powder feeder for filling the die.
- FIG. is a schematic piping diagram of the hydraulic system for operating the press.
- the hydraulic press herein illustrated comprises a base 1 having a lower fixed head 2 and an upper fixed head 3 interconnected by four postsor tie bars 4.
- the lower head 2 has mounted thereon (a) a central hydraulic cylinder 5 which operates the core rod 6 (see FIGS. 7 to 13) for forming the passage in the article A (or for forming a recess or hub in the lower end of the article) and (b) four pairs of cylinders 7, 8, 9 and 10 whose piston rods 7', 8', 9', and 10' are respectively connected to a die platen 11 which has a die opening 12 (see FIGS.
- any one of the platens l4, 15, or 16 may be operated by any pair-of cylinders 8, 9, or 10.
- the inner punch 20 on the bottom platen 14 is actuated by the smallest pair of cylinders 8
- the middle punch 21 on the middle platen 15 is actuated by the intermediate size cylinders 9
- the outer punch 22 on the top platen 16 is actuated by the largest pair of cylinders 10.
- the lower head 2 has secured thereto a pair of fixed columns 25 having adjustable stop collars 26 and 27 thereon of which the collars 26 determine the lowermost (die filling) positions of the punch platens 14, 15, and 16, as shown in FIG. 7 and of which the collars 27 determine the uppermost (article ejecting) positions of the punch platens l4, l5, and 16, as shown in FIG. 10.
- the lower collar 28 on each column 25 is fixed to determine the fixed lower position of the die platen and the upper ad- 55 justable collar 29 determines the uppermost (underfill) position of the die platen 11 as shown in FIG. 12.
- Similar adjustable stop collars 30 and 31 on the piston rod 5' determine the lowermost and uppermost positions of the core rod 6.
- the upper outer or main punch platen 35 is actuated by a pair of hydraulic cylinders 36 mounted on the upper head 3 and the upper inner punch platen 37 is actuated by a single cylinder 38 on said upper head 3.
- the punches 39 and 40 mounted on the respective platens 35 and 37 are adjusted as by means of worm gear adjusted nuts 41 and 42.
- the main upper platen 35 has a pair of stop rods 45 secured thereto adapted to engage the die platen 11, and the upper inner punch platen 37 also has a pair of rods 46 extending through the main platen.
- the rods 46 have adjustable collars 47 and 48 thereon to permit predetermined relative movement of the platens 35 and 37 during advance toward the die platen 11 or during ejection or stripping of the article A from the punches 39 and 40.
- a pair of floating spacer columns 50 Slidably guided in said lower head 2 and die platen 11 and extending through the punch platens l4, l5, and 16 and the die platen 11, are a pair of floating spacer columns 50 having adjustable stop collars 51 to determine the positions of the three punch platens 14, 15, and 16 with respect to the fixed reference collars 52 on said floating columns 50, said reference collars 52 being adapted to engage themain upper platen 35 as the platens l4, 15,.and 16 move upwardly and as the columns 50 move upwardly by engagement of the adjustable collars 51 with the platens 14, 15, and 16.
- the upper ends of the floating columns 50 are also adapted to engage the upper inner punch platen 37 whereby, as shown in FIG.
- the upper head 3 has thereon a bracket 55 on which is mounted a powder feed hopper 56 having a flexible tube 57 which is connected to a feedbox 58 as best shown in FIG. 14, the feedbox 58 being actuated as by means of a pair of hydraulic cylinders 59 to and from a position to fill the die 12 with powder and to strike off the powder level with the upper surface of the die platen. As will later be explained, when the feedbox 58 is in the FIG. 14 position, it will be shaken back and forth to assure complete filling of the die 12.
- FIGS. 7 to 10 and FIGS. 11 to 13 Before referring in detail to the hydraulic system of FIG. 15, brief reference will be made to FIGS. 7 to 10 and FIGS. 11 to 13.
- the lower platens 14, 15, and 16-and punches 20, 21, and 22 are in the positions relative to one another as is required for correct filling of the die prior to compaction.
- the main upper platen 35 and punch 39 has advanced downwardly with respect to the inner punch platen 37 and punch 40 so that the outer punch 39 will first enter the die 12 to form an initial seal, and as the lower punch platens 14, 15, and 16 move up (preferably in sequence as described in connection with FIG. 15) to final position as shown in FIG.
- the platens l4, l5, and 16 are now engaged with the upper stop collars 27 whereby the punches 20, 21, and 22 will be flush with the top of the die platen 11 so that the pressed article A may be removed and the feeder box 58 may be actuated to fill the die 12 as in FIG. 7 after the platens 14, 15, and 16 have been lowered to engage their lower stop collars 26.
- the die platen 11 is adapted to be actuated upwardly by the hydraulic cylinders 7 as when the article B is to have a recess in its upper end as shown in FIG. 11.
- the die cavity 12 after being filled with powder (while the die platen 11 is down against fixed stop collars 28 as in FIG. 11), is enlarged by raising the die platen 11 to engage the adjustable stop collars 29 which causes the level of powder to be spaced below the upper surface of the die platen 11 as shown in FIG. 12.
- the upper inner punch 66 moves down in advance of the upper outer punch 67, it will contact the powder but there will be no spillage or overflow because the level of the powder is below the level of the upper side of the die platen.
- the die platen llr will move down to engage its bottom stop collar 28 as is shown in FIG. 11.
- FIG. 15 shows the valve control circuits for achieving advance speed lowering of the upper platens 35 and 37, the advance of the platen 35 with respect to the platen 37, the desired sequence of actuation of the lower punch platens 14, 15, and 16, and the decreased hold pressure to achieve ejection while holding the punches 20, 21, 22, 39, and 40 in locked condition.
- up pressure may be applied in the upper cylinders 36 and 38 of a value less than the weights of the upper platens 35 and 37 whereby a lower up pressure may be used in the lower cylinders 8, 9, and 10 to move the upper platens 35 and 37 and to eject the article A from the die 12.
- FIG. 15 only the hydraulic circuitry for actuation of the cylinders 8, 9, 10, 36, and 38 for the respective punch platens 20, 21, 22, 39, and 40 has been illustrated.
- the core rod cylinder 5, the die platen cylinders 7, and the feeder cylinders 59 may be controlled in known manner by solenoid operated four-way valves, flow control valves, unloading valves, check valves, etc.
- valve 87 is set to bleed just enough feedback oil into the lower area of the upper cylinder 38 to compensate for static leakage and prevent down drift thereof and of the upper cylinders 36.
- the balance of the flow from pump 85 passes through a filter and heat exchanger (not shown) to the tank.
- solenoid 90 is energized to shift pilot valve 91 to block valves 81 and 84 and allow valves 82 and 83 to open, whereby pumps 77 and 78 oil is delivered to the upper areas of the lower platen cylinders 8, 9, and 10 dropping the lower platens 14, 15, and 16 and punches 20, 21, and 22 to enlarge the die cavity 12.
- the sequence in which the platens drop is determined by the counterbalance pressure applied below each pair of cylinders 8, 9, and 10, these pressures being set by control valves 92 in the respective valve assemblies 93.
- the upper areas of the lower platen cylinders 8, 9, and 10 are all acted on by equal pressure as they are connected to a common delivery source (pumps 77 and 78).
- valve 92 the cylinder 8, 9, or 10 with the lowest counterbalance pressure setting of valve 92 drops first pulling the connected platen 14, 15, or 16 and punch 20, 21, or 22 followed by the other cylinders having higher counterbalance pressure settings of their valves 92.
- the lower platens .14, 15, and 16 come to rest in turn against the stop collars 26.
- the pressure available is determined by valves 94 and 95 and is set at a relatively low value.
- the excess flow passes to tank through valve 95 closing the pressure switch 98 as valve 94 opens.
- the pressure switch 98 starts a timer (not shown), which is set to allow all of the lower platens to complete their strokes after which a timer contact energizes the solenoid 99 of valve 100 to open the vent of valve 101 to depressurize the system.
- the core rod 6 can also be lowered and raised during the die filling operation to help in filling the die cavity.
- Solenoid 110 shifts valve 114 to block valves 80 and 1 and allow valves 79 and 116 to open.
- Solenoid 111 shifts valve 117 to block valves 118 and 119 and to allow valves 120 and 121 to open. Oil from pumps 75 and 76 is thus directed to the upper areas of the three upper cylinders 36 and 38.
- Solenoid 112 shifts valve 122 to block valve 124 and to allow valve 123 to open whereby lower area return flow joins pump delivery to the upper area for high-speed approach.
- the cylinder rod end oil is forced through valves 125 and 126 at a counterbalance pressure as determined by the setting of valve 127.
- both upper platens 35 and 37 are locked together by collars 47 and 48 on stop rods 46 and advance as a unit carrying a single punch.
- the outer punch 39 is extended ahead of the inner punch 40 for the initial die entry.
- solenoid 128 is energized to shift the valve 129 to unload valve 126 and remove the counterbalance pressure from the outer punch cylinders 36.
- the outer punch 39 thus extends first until the platen 35 contacts the lower collars 48 extending from the inner punch platen 37 after which both. punches 39 and 40 move together.
- the reverse action is generally required with the inner punch 66 (FIGS. 11-13) extended for initial die entry.
- valve 122 shifts to block valve 123 and to open valve 124 allowing the rod and discharge oil to flow directly to the tank.
- the cylinders 36 and 38 now slow down to feed speed.
- solenoid 131 of valve 132 is energized to vent the relief valve 133 to unload pump 76 in which case the platens 35 and 37 slow directly to pressing speed only on the delivery of pump 75.
- a limit switch is released, starting a pressure dwell timer (not shown), and a contact therein deenergizes solenoid 90 to reload the pumps 77 and 78.
- Another timer contact energizes the solenoid 134 shifting valve 91 to block valves 82 and 83 and to allow valves 81 and 84 to open.
- Pump 77 and 78 delivery is directed to the lower areas of the lower platen cylinders 8, 9, and 10 raising the lower punches 20, 21, and 22 as the upper punches 39 and 40 continue to move down.
- the sequence in which the cylinders 8, 9, and 10 rise is determined by the counterbalance pressure, this time applied from above, these pressures being set by the control valves 135.
- Both upper 39 and 40 and lower 20, 21, and 22 punches move into the die 12 together, compacting the powder above and below for equal density.
- the reaction pressure from the article A causes the upper pressure in cylinders 36 and 38 to rise above the setting of the unloading valve 136, it opens to permit relief valve 133 to open to unload the pump 76 and slow the upper platens 35 and 37 to pressing speed. If pump 76 was previously unloaded by the energization of solenoid 131, the opening of valve 136 has no effect because the upper platens are already moving at pressing speed.
- reaction pressure causes the lower pressure to rise above the setting of the unloading valve 137 it opens unloading the pump 77 slowing the lower cylinders 8, 9, and 10 to pressing speed, whereby they are extended only on the delivery of pump 78.
- Both upper 39 and 40 and lower 20, 21, and 22 punches build to full tonnage set on the upper platens 35 and 37 by valve 138 and on the lower platens by valve 139.
- the upper platens 35 and 37 bottom on their stop pins 45 and 46 against the die platen 11 forcing it down against the lower stop collars 28 if it was raised for underfill.
- the lower platens 14, 15, and 16 come up against the collars 51 on the floating spacer columns 50 which are then butted against the upper platens 35 and 37 to positively space the upper 39 and 40 and lower 20, 21 and 22 punches for accurate part size.
- the press dwells at full tonnage in this condition until the timer aforesaid times out.
- a timer contact is maintained closed to maintain energization of solenoid 134 to pressurize the lower cylinders 8, 9, and 10 upward for the ejection stroke.
- the ejection occurs because of the reduction or removal of overhead pressure caused by deenergizing solenoids and 11 1 and energizing solenoids 144 and 143 unblocking valves 80 and and 118 and 119 and blocking valves 79 and 116 and and 121 directing pump flow to the lower areas of the cylinders 36 and 38 which allows the lower platens 14, 15, and 16 to rise.
- the solenoid 140 is held energized while the upper platen 37 is below an upper limit switch (not shown).
- Valve 141 shifts the upper platen pressure control to valve 142 which is set to a lower value than is needed to lift the gross weight of the platens 35 and 37.
- the balance of the lift if provided by the lower platens 14, 15, and 16 through the floating spacer columns 50. This is the top holddown force which can be adjusted from 0 to the full weight of the upper platens 35 and 37 with the control set at light".
- the solenoid 140 is deenergized, and control of the upper platen pressure shifts back to valve 138 which is set at full compacting tonnage.
- the upper punches 39 and 40 are immediately lifted off the compact allowing the ejection stroke to be completed normally.
- Solenoid 110 is at this time energized to hold the outer punch 67 down and solenoid 143 is energized to lift the inner punch 66.
- the solenoid 131 then is energized to dump pump 76 oil to reduce the amount of oil as only one cylinder 38 is working.
- the solenoids 110 and 131 are deenergized while solenoid 144 is energized to lift the outer punch 67 also on full oil volume.
- the outer punch 39 For an article A with a straight-sided hub at the top the outer punch 39 must be retracted while the inner punch 40 presses down on the hub. This is accomplished by energizing the solenoid 111 to hold the inner punch 40 down and when solenoid 144 is energized, the outer punch 39 is lifted. Solenoid 131, when energized, dumps pump 76 oil as aforesaid, to reduce the amount of oil with only two cylinders 36 working. When the timer times out, the solenoids 111 and 131 are deenergized and solenoid 143 is energized to lift the inner punch 40 also on full oil volume.
- the die platen 11 may be partially lifted from its lower position against collars 28 by friction from the article A or B as it is ejected. In any case, the die platen l 1 will be raised the rest of the way until it is against its upper stop collars 29. If the core rod 6 is below its upper position from a core ejection stroke, it is elevated to its upper position. The press is now in condition for repeating the aforesaid cycle.
- a hydraulic press for making compacted articles from powdered material comprising die and punch members respectively defining the side and end portions of the article when said punch members are moved toward each other against powdered material in said die member; support means on which said punch members are movably supported; fluid motor means on said support means operatively connected to the respective punch members to move them as aforesaid; interengageable stop means between one of said punch members and said die member; a spacer member movable with respect to said die member and disposed between said punch members to arrest relative movement thereof thus to determine the size of the compacted article while said stop means are interengaged; and control valve means operative to control fluid pressures in said fluid motor means so that said punch members and said spacer member are moved in unison in a direction to disengage said stop means, thus to eject the compacted article from said die member.
- control valve means during ejection of the article from said die member, conducts fluid under pressure to said motor means tending to move said punch members and said spacer member in the same direction with the magnitude of pressure in said motor means being such that the forces are respectively not greater than and greater than the gravitational and frictional forces whereby said spacer member remains in interengagement between said punch members while the compacted article is ejected from said die member.
- control valve means during ejection of the compacted article from said die member, conducts fluid under pressure to said motor means with the magnitude of pressures in said motor means being such that a difierential force overcomes gravitational and frictional forces so that said spacer member remains in interengagement between said punch members while the compacted article is ejected from said die member.
- a press for making compacted articles from powdered material comprising a base having upper and lower heads with vertical guide means extending between said heads; an upper punch platen vertically movably supported by said guide means, and fluid motor means on said upper head operatively connected to said upper punch platen so to vertically move the latter; a plurality of lower punch platens vertically movably guided by said guide means, and plural fluid motor means operatively connected to said lower platens so to vertically move said lower platens; a die platen supported by said base between said upper punch platen and said lower punch platens; said upper and lower punch platens having punches which define with a die on said die platen the sidewall and end walls of the article when the upper and lower punch members are moved relatively toward each other against powdered material in said die and between said punch member; interengageable stop means between said upper punch platen and said die platen; a spacer member vertically movably extending through said die platen and disposed for engagement between said upper punch platen and the respective lower punch
- a support means carried by the support defining a molding cavity for containing material to be molded into an article, first and second punch members on opposite sides of said cavity, means for moving said punch members toward each other into engagement with the material to form the article, a spacer member engaged by both punch members to limit their travel toward each other, and means to simultaneously move the punch and spacer members in one direction for ejecting the article from the cavity.
- a press for making compacted articles from powdered material comprising a base having upper and lower heads with vertical guide means extending between said heads; an upper punch platen vertically movably supported by said guide means and fluid motor means on said upper head operatively connected to said upper punch platen so to vertically move the latter; a lower punch platen vertically movably guided by said guide means and fluid motor means on said lower head operatively connected to said lower platen so to vertically move said lower platen; a die platen supported by said base between said upper punch platen and said lower punch platen; said upper and lower punch platens having punches which define with a die on said die platen the sidewall and end walls of the article when the upper and lower punch members are moved rela,ively toward each other against powdered material in said die and between said punches; a vertically movable spacer member extending through said die platen and disposed between said punch platens to arrest vertical relative movement of said upper and lower punch platens thus to determine the size of the compacted article;
- stop means are associated with said lower punch platen for movement of the punch thereof to strip the sidewall of the compacted article from said die; said stop means comprising a stop rod extending upwardly from said lower head through an opening in said lower punch platen, and a pair of stop collars on said stop rod determining the uppermost and lowermost positions of said lower punch platen for ejection as aforesaid and for filling of said die with powdered material.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
- Press Drives And Press Lines (AREA)
Abstract
Description
Claims (11)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US85422269A | 1969-08-29 | 1969-08-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3647332A true US3647332A (en) | 1972-03-07 |
Family
ID=25318074
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US854222A Expired - Lifetime US3647332A (en) | 1969-08-29 | 1969-08-29 | Hydraulic press |
Country Status (3)
Country | Link |
---|---|
US (1) | US3647332A (en) |
DE (1) | DE2041923A1 (en) |
GB (1) | GB1313312A (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3733154A (en) * | 1971-08-17 | 1973-05-15 | Wolverine Pentronix | Deflection compensation system for press |
US3758245A (en) * | 1970-07-03 | 1973-09-11 | Mannesmann Meer Ag | Hydraulic press for compression of powder |
US3868201A (en) * | 1973-04-17 | 1975-02-25 | Wickes Corp | Powdered metal press |
US4153399A (en) * | 1977-09-08 | 1979-05-08 | Ptx-Pentronix, Inc. | Multiple punch tool set for powder compacting press |
US4259054A (en) * | 1978-12-04 | 1981-03-31 | Wehr Corporation | Brick press frame having prestressed columns |
US4260346A (en) * | 1979-10-09 | 1981-04-07 | Anderson Jr Raymond B | Press assembly for powder material |
US4588539A (en) * | 1985-02-04 | 1986-05-13 | James River Corporation Of Virginia | Process and press with a controlled pressure system |
US4789323A (en) * | 1987-06-11 | 1988-12-06 | Hudson William R | Ring making apparatus |
US4801415A (en) * | 1985-08-16 | 1989-01-31 | Micropore International Limited | Method for forming shaped pieces of insulation |
US5326242A (en) * | 1990-08-10 | 1994-07-05 | Yoshizuka Seiki Co., Ltd. | Powder molding press |
US5370760A (en) * | 1992-09-29 | 1994-12-06 | Murata Manufacturing Co., Ltd. | Method of manufacturing multilayer ceramic electronic component |
US20050089436A1 (en) * | 1999-03-31 | 2005-04-28 | Sumitomo Coal Mining Co., Ltd. | Method and apparatus for automatically loading powder material into a mold |
CN101830076B (en) * | 2009-12-19 | 2012-09-05 | 严培义 | Mechanical powder moulding machine four lower punch mechanism |
CN101850629B (en) * | 2009-09-29 | 2012-10-10 | 严培义 | Three-uprush mechanism of powder forming machine |
CN111409250A (en) * | 2019-01-08 | 2020-07-14 | 科展材料科技股份有限公司 | Pressing machine |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1107475B (en) * | 1978-07-24 | 1985-11-25 | Merisinter Spa | PRESS AND MOLD HOLDER COMPLEX FOR POWDER METALLURGY COMPACTION |
DE3142126A1 (en) * | 1981-10-23 | 1983-05-11 | Dorst-Keramikmaschinen-Bau Otto Dorst U. Dipl.-Ing. Walter Schlegel, 8113 Kochel | "PRESS FOR THE PRODUCTION OF TAILORED PRESSINGS FROM POWDER-SHAPED MATERIAL" |
AT391104B (en) * | 1985-04-01 | 1990-08-27 | Sgp Va Energie Umwelt | SEALING SYSTEM FOR A HIGH PRESSURE VESSEL |
DE3940192A1 (en) * | 1989-02-02 | 1990-08-09 | Gottfried Weber | HYDRAULIC PRESS |
DE9203546U1 (en) * | 1992-03-17 | 1993-07-22 | Komage - Gellner & Co. Maschinenfabrik KG, 54427 Kell | Device for pressing molded parts from a fine-grained mass |
AT402375B (en) * | 1994-10-14 | 1997-04-25 | Kranzinger Norbert | METHOD AND DEVICE FOR PRODUCING HOLLOW BLOCKS |
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US2509783A (en) * | 1945-10-17 | 1950-05-30 | Hpm Dev Corp | Apparatus for molding |
US2810929A (en) * | 1953-05-06 | 1957-10-29 | Baldwin Lima Hamilton Corp | Apparatus for compacting and ejecting flanged articles |
US2821748A (en) * | 1953-05-08 | 1958-02-04 | Baldwin Lima Hamilton Corp | Apparatus for compacting and ejecting flanged articles by single plunger action |
US2883703A (en) * | 1957-03-21 | 1959-04-28 | Stokes F J Corp | Powder press with proportional pressing control |
US3132379A (en) * | 1961-04-12 | 1964-05-12 | Bliss E W Co | Compacting press |
US3154812A (en) * | 1962-03-07 | 1964-11-03 | Haller John | Hydraulic briquetting press |
US3168759A (en) * | 1963-01-17 | 1965-02-09 | Cincinnati Shaper Co | Core punch and bottom stop therefor |
US3172156A (en) * | 1962-09-06 | 1965-03-09 | Cincinnati Shaper Co | Compacting press |
US3191232A (en) * | 1961-12-07 | 1965-06-29 | Haller John | Hydraulic compacting press |
US3337916A (en) * | 1965-10-28 | 1967-08-29 | Cincinnati Shaper Co | Compacting press with selective ejection |
US3464089A (en) * | 1967-05-19 | 1969-09-02 | Cincinnati Shaper Co | Compacting press |
US3524220A (en) * | 1967-11-15 | 1970-08-18 | Western Electric Co | Die set for compacting powder |
-
1969
- 1969-08-29 US US854222A patent/US3647332A/en not_active Expired - Lifetime
-
1970
- 1970-08-03 GB GB3733270A patent/GB1313312A/en not_active Expired
- 1970-08-24 DE DE19702041923 patent/DE2041923A1/en active Pending
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US2509783A (en) * | 1945-10-17 | 1950-05-30 | Hpm Dev Corp | Apparatus for molding |
US2810929A (en) * | 1953-05-06 | 1957-10-29 | Baldwin Lima Hamilton Corp | Apparatus for compacting and ejecting flanged articles |
US2821748A (en) * | 1953-05-08 | 1958-02-04 | Baldwin Lima Hamilton Corp | Apparatus for compacting and ejecting flanged articles by single plunger action |
US2883703A (en) * | 1957-03-21 | 1959-04-28 | Stokes F J Corp | Powder press with proportional pressing control |
US3132379A (en) * | 1961-04-12 | 1964-05-12 | Bliss E W Co | Compacting press |
US3191232A (en) * | 1961-12-07 | 1965-06-29 | Haller John | Hydraulic compacting press |
US3154812A (en) * | 1962-03-07 | 1964-11-03 | Haller John | Hydraulic briquetting press |
US3172156A (en) * | 1962-09-06 | 1965-03-09 | Cincinnati Shaper Co | Compacting press |
US3168759A (en) * | 1963-01-17 | 1965-02-09 | Cincinnati Shaper Co | Core punch and bottom stop therefor |
US3337916A (en) * | 1965-10-28 | 1967-08-29 | Cincinnati Shaper Co | Compacting press with selective ejection |
US3464089A (en) * | 1967-05-19 | 1969-09-02 | Cincinnati Shaper Co | Compacting press |
US3524220A (en) * | 1967-11-15 | 1970-08-18 | Western Electric Co | Die set for compacting powder |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3758245A (en) * | 1970-07-03 | 1973-09-11 | Mannesmann Meer Ag | Hydraulic press for compression of powder |
US3733154A (en) * | 1971-08-17 | 1973-05-15 | Wolverine Pentronix | Deflection compensation system for press |
US3868201A (en) * | 1973-04-17 | 1975-02-25 | Wickes Corp | Powdered metal press |
US4153399A (en) * | 1977-09-08 | 1979-05-08 | Ptx-Pentronix, Inc. | Multiple punch tool set for powder compacting press |
US4259054A (en) * | 1978-12-04 | 1981-03-31 | Wehr Corporation | Brick press frame having prestressed columns |
US4260346A (en) * | 1979-10-09 | 1981-04-07 | Anderson Jr Raymond B | Press assembly for powder material |
US4588539A (en) * | 1985-02-04 | 1986-05-13 | James River Corporation Of Virginia | Process and press with a controlled pressure system |
US4801415A (en) * | 1985-08-16 | 1989-01-31 | Micropore International Limited | Method for forming shaped pieces of insulation |
US4789323A (en) * | 1987-06-11 | 1988-12-06 | Hudson William R | Ring making apparatus |
US5326242A (en) * | 1990-08-10 | 1994-07-05 | Yoshizuka Seiki Co., Ltd. | Powder molding press |
US5370760A (en) * | 1992-09-29 | 1994-12-06 | Murata Manufacturing Co., Ltd. | Method of manufacturing multilayer ceramic electronic component |
US20050089436A1 (en) * | 1999-03-31 | 2005-04-28 | Sumitomo Coal Mining Co., Ltd. | Method and apparatus for automatically loading powder material into a mold |
CN101850629B (en) * | 2009-09-29 | 2012-10-10 | 严培义 | Three-uprush mechanism of powder forming machine |
CN101830076B (en) * | 2009-12-19 | 2012-09-05 | 严培义 | Mechanical powder moulding machine four lower punch mechanism |
CN111409250A (en) * | 2019-01-08 | 2020-07-14 | 科展材料科技股份有限公司 | Pressing machine |
US11161315B2 (en) * | 2019-01-08 | 2021-11-02 | Corex Materials Corporation | Press machine |
Also Published As
Publication number | Publication date |
---|---|
GB1313312A (en) | 1973-04-11 |
DE2041923A1 (en) | 1971-03-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SCHULER LEUKART INCORPORATED, A CORP. OF OH, OHIO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PARKER-HANNIFIN CORPORATION;REEL/FRAME:004834/0654 Effective date: 19870420 Owner name: RESOURCE GENERAL CORPORATION, A OH CORP.,OHIO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SCHULER INCORPORATED;REEL/FRAME:004824/0712 Effective date: 19870403 Owner name: SCHULER LEUKART INCORPORATED, A CORP. OF OH Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PARKER-HANNIFIN CORPORATION;REEL/FRAME:004834/0654 Effective date: 19870420 Owner name: RESOURCE GENERAL CORPORATION, 250 EAST BROAD STREE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SCHULER INCORPORATED;REEL/FRAME:004824/0712 Effective date: 19870403 |