US3262294A - Hydraulic forming press - Google Patents

Hydraulic forming press Download PDF

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Publication number
US3262294A
US3262294A US302567A US30256763A US3262294A US 3262294 A US3262294 A US 3262294A US 302567 A US302567 A US 302567A US 30256763 A US30256763 A US 30256763A US 3262294 A US3262294 A US 3262294A
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US
United States
Prior art keywords
chamber
pressure
section
partition
fluid
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
US302567A
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English (en)
Inventor
Charles L Mitchell
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.)
Milacron Inc
Original Assignee
Cincinnati Milling Machine Co
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 Cincinnati Milling Machine Co filed Critical Cincinnati Milling Machine Co
Priority to US302567A priority Critical patent/US3262294A/en
Priority to FR966982A priority patent/FR1390560A/fr
Priority to DE19641502148 priority patent/DE1502148B1/de
Priority to GB13965/64A priority patent/GB994770A/en
Priority to NL646403808A priority patent/NL140776B/nl
Application granted granted Critical
Publication of US3262294A publication Critical patent/US3262294A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/02—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of a flexible element, e.g. diaphragm, urged by fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/10—Stamping using yieldable or resilient pads
    • B21D22/12—Stamping using yieldable or resilient pads using enclosed flexible chambers

Definitions

  • two members thereof are mounted in telescopic relation.
  • a flexible diaphragm secured across one end of the outermember defines, with the inner and outer member, a chamber which is expanded and contracted when relative movement between the inner and outer members occur.
  • a reservoir for hydraulic fluid supplies fluid to the chamber as it expands, and receives fluid from the chamber as it contracts, preferably through a passage in the inner member which terminates at an opening in the chamber.
  • a bed to receive workpiece blanks is provided, preferably below the chamber, and .a male die is slidably received in the bed for vertical movement.
  • the outer telescoping press member descends to the bed for engagement of the flexible die member with the workpiece blank, the chamber expanding and receiving fluid from the reservoir during this closing movement.
  • pressure in the chamber is raised, as, for ex- .ample, by supplying additional fluid under high pressure to the expanded chamber.
  • the male die is raised, urging the workpiece blank into the flexible die member, and the pressure in the chamber, acting through the flexible member, shapes the workpiece blank in accordance with the shape of the male die.
  • the flexible die member is deflected upwardly, contracting the chamber.
  • fluid must be released from the chamber as the male die is raised to maintain the desired pressure level in the chamber.
  • pressure is released from the chamber, and the outer press member is raised for removal of the finished workpiece, contracting the chamber and returning the fluid therein to the reservoir as the press is opened.
  • a partition is provided in the chamber, dividing the chamber into sections, one section in communication with the opening through which fluid passes to and from the chamber, and another section in communication with the flexible die member.
  • the partition which is secured in the same telescoping member as the flexible diaphragm, has at least two passages extending therethrough, each having a check valve therein. The two check valves are normally closed and remain closed when the flexible diaphragm is rapidly lowered to the bed to engage the workpiece blank. Thus, it is only the upper section of the chamber which expands. Since there is no expansion of the lower section of the chamber, no
  • the partition since it divides the pressure chamber into sections, limits the amount of fluid lost if the flexible diaphragm should rupture during forming.
  • FIG. 1 is a cross-sectional view of a hydraulic forming press incorporating the present invention
  • FIG. 2 is a view taken on the line 2-2 of FIG. 1;
  • FIG. 3 is an enlarged view, taken as the view of FIG. 1, of the lower section of the pressure chamber before formation of the workpiece begins;
  • FIG. 4 is a view similar to the view of FIG. 3 except that it shows the lower section of the pressure chamber during formation of the workpiece.
  • FIGS. 1 and 2 There is shown in FIGS. 1 and 2 a hydraulic forming press having a bed 10, a head section 11 above the bed,
  • the head member 11 has a cylindrical depending portion 11a, and a sleeve 13 is slidably received over the depending portion 11a for vertical movement thereon.
  • Two cylindrical chambers 14 in the head member 11 each slidably receive therein a piston 15 which is connected by rod 15a to the sleeve 13.
  • Chambers 14 and pistons 15 define motors which, under the control of four-way valve .16, operate to raise and lower the sleeve 13.
  • a diaphragm .17 constructed of rubber or other flexible material, is received in the lower end of the sleeve 13 and secured therein by ring clamp 18 to define a chamber 19 bounded by the lower end of head member portion 11a, the sleeve 13, and the diaphragm 17.
  • the head member 11 has a reservoir 20 for hydraulic fluid, and a passage 21 extends from reservoir 20 through depending portion 11a to an opening 22 into chamber 19.
  • a valve 23 in passage 21 permits selective communication between reservoir 20 and chamber 19.
  • the bed member 10 which receives a workpiece blank 24 has an opening 25 in which a male die member 26 is slidably received.
  • Piston 28 is connected to die memaaeaase her 26 by piston rod 30 to effect vertical movement of the die member.
  • Sleeve 13 has an internal circumferential groove in chamber 19 which receives a split steel ring 36.
  • Two plates 37 and 38 are secured together by bolts 39 in straddling relation to the split ring 36 so that the plates are securely held in the sleeve 13.
  • These plates which extend across the chamber 19 and separate the flexible diaphragm 17 from the opening 22, define a partition which divides the chamber into two sections, an upper section 190 and a lower section 1%. Since the partition is secured in the movable sleeve 13 (the same member to which the diaphragm is secured), it is only the upper section 19a of the chamber (in communication with opening 22) which will expand as the sleeve descends to close the press. The lower section of the chamber, which is in communication with the flexible diaphragm 17, will not expand as the press closes.
  • passages 40 there is shown six passages extending through the partition.
  • Three passages 40 each have a check valve 41 therein which permits flow of fluid only from the upper section 1% of the chamber to the lower section 1% thereof.
  • the other three passages 42 each have a check valve 43 therein which only permits flow of fluid from the lower section 1% of the chamber to the upper section 19a thereof.
  • the check valves in passages 42 are directed oppositely to the check valves in the passages 40.
  • Three fixed studs 44 extend from the bottom of stationary frame portion 11a to enter, respectively, the three passages 40 and hold check valves 41 open when the sleeve is in its uppermost position as shown in FIG. 1.
  • each check valve 41 When the check valves 41 are disengaged from studs 44, the spring 45 of each check valve 41 holds the check valve closed until the pressure in section 1% exceeds the pressure in section 1912 by some predetermined amount, at which time the valve opens and remains open until the pressure differential across the partition drops below that predetermined amount. In a similar manner spring 46 of check valve 43 holds the check valve closed until the pressure in section 1% exceeds the pressure in section 19a by some predetermined amount.
  • valve 23 When the press is open (that is, the sleeve 13 is raised to its upper limit as shown in FIG. 1), a workpiece blank 24 is placed on the bed 10.
  • the valve 23 is in the position shown in FIG. 1 .and, since the check valves 41 are held open by studs 44, chamber sections 1% and 191) are filled with low pressure fluid from reservoir 20.
  • a pump 50 takes fluid from sump 51 and delivers it under pressure to line 52.
  • the movable valve member 53 of valve 16 When the movable valve member 53 of valve 16 is shifted to the left from the position shown in FIG. 1, fluid under pressure is delivered to line 54 to lower sleeve 13 until flexible die member 17 engages workpiece blank 24.
  • check valves 41 close and remain closed during the descent of sleeve 13.
  • the descent of sleeve 13 may be rapid and, if the-chamber section 19a is expanded at a greater rate than fluid can flow from reservoir 20 through passage 21 to chamber section 1%, a partial vacuum will be created in that chamber section. Although, at this time, the pressure in chamber section 1% will be greater than the pressure in chamber section 19a, the pressure differential will not be great enough to open check valves 43.
  • the maximum pressure in line 59 is determined by adjustable relief valve 69, which is set for a high valve, as, for example, 10,000 pounds per square inch.
  • adjustable relief valve 69 which is set for a high valve, as, for example, 10,000 pounds per square inch.
  • the high pressure introduced to the upper section 19a of the chamber creates a pressure differential across the partition which opens the check valves 41 in passages 40 (as shown in FIG. 3) so that the high pressure fluid is introduced to the lower section 1% of chamber 19.
  • the check valves .-1 close.
  • the movable valve member 63 of valve 29 is shifted to the right to connect pressure line 52 with motor line 64. This raises the male die 26 and urges the workpiece blank 24 into the flexible diaphragm 17 to form the workpiece around the male die member.
  • the male die member 26 pushes the workpiece blank 24 into flexible diaphragm 17, the lower section 1% of the chamber contracts.
  • valve member 61 of valve 62 is shifted to the right and valve member 23 is opened to relieve pressure in chamber section 19a.
  • valve member 53 of valve 16 is shifted to the right, connecting pressure line 52 to motor line 65 and connecting motor line 54 to exhaust line 66, to raise the sleeve 13.
  • the check valves remain closed, forcing the fluid in the upper section 19a of chamber 19 back up through passage 21 into reservoir 20, until the sleeve 13 approaches its uppermost limit.
  • the check valves 41 are opened by engagement with studs 44, and fluid can flow into bottom chamber section 19b to replace the fluid forced out of this chamber section by contraction during forming.
  • valve member 63 of valve 29 is shifted to the left, connecting pressure line 52 to motor line 67 and connecting motor line 64 to exhaust line 68, to lower the male die plunger for removal of the finished workpiece.
  • a hydraulic forming press comprising means defining an expandable pressure chamber, said means including a flexible diaphragm closing one end of the pressure chamber, said pressure chamber having an opening through which hydraulic fluid is received as the chamber expands, and a partition extending across the chamber between said opening and the flexible diaphragm to divide the chamber into two sections; said partition isolating the section of the chamber between the partition and the flexible diaphragm from the section of the chamber between the partition and the opening as the chamber expands.
  • a hydraulic forming press comprising in combination:
  • a male die member operable when the sleeve is down to extend into the flexible diaphragm and form a workpiece blank received between the male die member and the flexible diaphragm

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Actuator (AREA)
  • Press Drives And Press Lines (AREA)
US302567A 1963-08-16 1963-08-16 Hydraulic forming press Expired - Lifetime US3262294A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US302567A US3262294A (en) 1963-08-16 1963-08-16 Hydraulic forming press
FR966982A FR1390560A (fr) 1963-08-16 1964-03-11 Presse à emboutir hydraulique
DE19641502148 DE1502148B1 (de) 1963-08-16 1964-03-31 Membranpresse
GB13965/64A GB994770A (en) 1963-08-16 1964-04-03 Hydraulic forming press
NL646403808A NL140776B (nl) 1963-08-16 1964-04-09 Hydraulische vormpers.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US302567A US3262294A (en) 1963-08-16 1963-08-16 Hydraulic forming press

Publications (1)

Publication Number Publication Date
US3262294A true US3262294A (en) 1966-07-26

Family

ID=23168306

Family Applications (1)

Application Number Title Priority Date Filing Date
US302567A Expired - Lifetime US3262294A (en) 1963-08-16 1963-08-16 Hydraulic forming press

Country Status (4)

Country Link
US (1) US3262294A (nl)
DE (1) DE1502148B1 (nl)
GB (1) GB994770A (nl)
NL (1) NL140776B (nl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1752963C (de) 1967-08-21 1973-03-01 The Cincinnati Milling Machine Co., Cincinnati, Ohio (V.St.A.) Flexibler napfartiger Druckkammerabschlußeinsatz

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60133933A (ja) * 1983-12-21 1985-07-17 Honda Motor Co Ltd プレス成形法
FR2641217B1 (fr) * 1988-12-30 1994-04-01 Isoform Procede et dispositif d'emboutissage de materiaux en feuille sur une matrice de formage elastique

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2741205A (en) * 1952-08-12 1956-04-10 Cincinnati Milling Machine Co Hydraulic press structure
US3094091A (en) * 1959-12-22 1963-06-18 Peccerill Donald Apparatus for making bulged articles

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB581047A (en) * 1944-07-19 1946-09-30 Walter Roy Bridgens Improvements in and relating to hydraulic presses

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2741205A (en) * 1952-08-12 1956-04-10 Cincinnati Milling Machine Co Hydraulic press structure
US3094091A (en) * 1959-12-22 1963-06-18 Peccerill Donald Apparatus for making bulged articles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1752963C (de) 1967-08-21 1973-03-01 The Cincinnati Milling Machine Co., Cincinnati, Ohio (V.St.A.) Flexibler napfartiger Druckkammerabschlußeinsatz

Also Published As

Publication number Publication date
NL140776B (nl) 1974-01-15
GB994770A (en) 1965-06-10
NL6403808A (nl) 1965-02-17
DE1502148B1 (de) 1970-12-03

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