US3675889A - Top block lifting with back block loading control - Google Patents

Top block lifting with back block loading control Download PDF

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Publication number
US3675889A
US3675889A US66499A US3675889DA US3675889A US 3675889 A US3675889 A US 3675889A US 66499 A US66499 A US 66499A US 3675889D A US3675889D A US 3675889DA US 3675889 A US3675889 A US 3675889A
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US
United States
Prior art keywords
block
rear end
screw
top block
blocks
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
US66499A
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English (en)
Inventor
Richard O Peck
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Amsted Industries Inc
Original Assignee
Amsted Industries Inc
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 Amsted Industries Inc filed Critical Amsted Industries Inc
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Publication of US3675889A publication Critical patent/US3675889A/en
Assigned to AMSTED INDUSTRIES INCORPORATED, A CORP. OF DE. reassignment AMSTED INDUSTRIES INCORPORATED, A CORP. OF DE. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: FIRST NATIONAL BANK OF CHICAGO, AS AGENT
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/06—Ingot moulds or their manufacture
    • B22D7/08—Divided ingot moulds

Definitions

  • the top block is moved into engagement with an end [52] U.S. Cl ..249/82, 254/ 103 blo k by screw jacks driven by a motor with a spring provided [51] Int. Cl. ..B29c 1/16 between one of the screws and the top block to accommodate [58] Field of Search ..249/82, 158, 162; 164/323; thermal expansion.
  • Load sensing means are provided to shut- 318/12, 14, 15, 160; 254/98, 103 down the motor after a particular load between the top and an end block has been achieved.
  • the mold herein referred to is of the type described in US. Pat. No. 3,340,926, which is normally filled from the bottom by pressure casting.
  • the mold includes a pair of opposed side blocks, and a plurality of inner blocks engaged between the side blocks to define a casting cavity.
  • the inner blocks include a top block, one end of which is clamped against an end block.
  • Various problems caused by thermal expansion of the end block have been encountered, making control of the clamping force of the top block against the end block difficult to control. Excessive force between the two blocks causes bending or distortion of the end block and may cause damage thereto.
  • an object of the present invention is to provide means for accurately controlling the clamping force between intergaged inner parts of the aforesaid mold, notwithstanding thermal expansion of said parts relative to one another.
  • FIG. 1 is a perspective view of a portion of a permanent slab mold that incorporates features of the presently described invention
  • FIG. 2 is an isolated vertical sectional view of the spring package shown in FIG. 1;
  • FIG. 3 is a partial vertical sectional view of a screw jack having load sensing means, which is used in connection with the arrangement shown in FIG. 1.
  • the mold includes a pair of opposed graphite side blocks, one of which 10, is shown held in a flask 1 1, and a plurality of inner graphite or metal blocks, including a bottom block 12, a forward end block 14, a rear end block 16, and a top block 18.
  • the inner blocks 12, l4, l6 and 18, are clamped between the side blocks to define a casting cavity 20.
  • the front end block 14 is slightly spaced from one end of the bottom block 12 and from the top block 18 to define, respectively, a bottom ingate 22 for the entrance of molten metal, and a riser passage 24.
  • Other details of the mold are unimportant to the understanding of the present invention and are omitted for the sake of clarity.
  • the lower end of the rear end block 16 rests on the upper casting surface 26 of the bottom block 12, and the upper end of said end block is engageable with the lower casting surface 28 of the top block 18.
  • Means are provided for lowering and raising the top block 18 into and out of engagement with the rear end block 16, said means comprising a motor 30 having respective oppositely extending shafts 32 and 34 connected to respective gear boxes 36 and 38, said gear boxes being connected by respective shafts 40 and 42 to respective screw jacks 44 and 46 located near opposite ends of the top block 18, said screw jacks being operative to drive respective screws 48 and 50 connected to the top block.
  • the foregoing motor, shafts, gear boxes and screw jacks are are I mounted on supports, such as 52, secured to one of the side block flasks 11.
  • the lower end of the screw 48 nearest the riser passage 24 is pivotally connected to the top block 18 at 54.
  • the lower end of the screw 50 nearest the rear end block 16 is pivotally connected to a disk 56, which is part of a spring package 58 best illustrated in FIG. 2.
  • the spring package 58 comprises a hollow cylindrical member 60 secured to the top of the top block 18, said member having a circular recessed area 62 near the top thereof in which the disk is received, said disk being larger than the internal bore of said cylindrical member,- so as to be limited in travel to the height of the circular recess.
  • Spring means, such as a helical spring 64 is provided within the cylindrical member 60 and extends between the disk 56 and an up r surface of the top block 18.
  • the screw jack includes a housing 66 in which is located a worm gear 68 connected to the driven shaft 42 shown in FIG. 1.
  • a nut 69 is threaded over the screw 50, said nut being in vertically slidable keyed engagement with a gear 70 extending around the outer periphery of said nut.
  • Respective upper and lower ring bearings 72 and 74 are provided above and below the nut 69 to enable free rotation of the nut.
  • Spring means, such as a helical spring 76 extends between the top of the upper ring 72 and the internal end of the housing 66.
  • a rod 80 extends from an upper surface of the upper ring bearing 72, through an aperture 82 in the housing 66, and terminates at or near the exterior of the housing.
  • the rod 80 is engageable with an arm 83 connected to a normally closed limit switch 84.
  • the other screw jack is of a similar' design, except the gear is not slidable on the nut and the rod, springs and switch are omitted.
  • the motor 30 is activated, causing the screw jacks 44 and 46 to become activated and lower the respective screws 48 and 50 and the top block 18.
  • the screw jacks 44 and 46 After the top block 18 has contacted the upper surface of the rear end block additional force is applied, and the continued rotation of worm gear 68 and gear 70 causes the nut 69 to move upward on the now stationary shaft 50 to compress the spring 76.
  • the rod moves upward into contact with the arm 83 of the switch 84, which is electrically connected to the motor 30.
  • the switch is designed such that movement of the arm opens the circuit of the motor, thereby shutting down the motor.
  • the spring 64 is selected from a capacity as to compensate for upward thermal expansion of the rear end block and also to compensate for-extra revolutions of the motor after the switch 84 has been opened. The spring 64 is normally partially compressed when the top block is in its final position against the rear end block.
  • An improved permanent slab mold comprising in combination a pair of opposed side blocks, front end, rear end, top and bottom blocks engaged between the side blocks to define a casting cavity, said rear end block being engageable between said top and bottom blocks, a screw mounted for supporting said top block and for bringing said top block into engagement with said rear end block, spring means interposed between said screw and said top block for accomodating relative thermal expansion between said rear end block and said top block, motor means operatively connected to said screw for raising and lowering said top block, load sensing means for sensing the load between the top block and the rear end blocks, and switch means in connection with said load sensing means to shut down said motor as given load is reached.
  • An improved permanent slab mold comprising in combination a pair of opposed side blocks, from end, rear end, top and bottom blocks engaged between the side blocks to define a casting cavity, said rear end block being engageable between said top and bottom blocks, a screw mounted for supporting said top block and for bringing said top block into engagement with said rear end block, spring means interposed between said screw and said top block for accomodating relative thermal expansion between said rear end block and said top block, a housing surrounding said screw and having a top wall, a nut in said housing surrounding said screw, a gear rotatably mounted in the housing, said nut being keyed to the gear for rotation therewith and for sliding axial movement relative thereto, a spring interposed between the nut and the top wall of the housing, and means for rotating said gear and nut to advance the screw until the top block contacts 7 the rear end block and the nut moves upwardly to compress the spring a predetermined amount.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Transmission Devices (AREA)
US66499A 1970-08-24 1970-08-24 Top block lifting with back block loading control Expired - Lifetime US3675889A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6649970A 1970-08-24 1970-08-24

Publications (1)

Publication Number Publication Date
US3675889A true US3675889A (en) 1972-07-11

Family

ID=22069881

Family Applications (1)

Application Number Title Priority Date Filing Date
US66499A Expired - Lifetime US3675889A (en) 1970-08-24 1970-08-24 Top block lifting with back block loading control

Country Status (5)

Country Link
US (1) US3675889A (ja)
JP (1) JPS5114445B1 (ja)
CA (1) CA965934A (ja)
DE (1) DE2138374B2 (ja)
SE (1) SE376182B (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851377A (en) * 1973-03-27 1974-12-03 D Dumas Sealing of metal bars in carbonized blocks
US3888453A (en) * 1974-04-12 1975-06-10 Amsted Ind Inc Top block stop for applying a longitudinal force to the top block of a pressure casting mold
US4487249A (en) * 1982-10-18 1984-12-11 United States Steel Corporation Method and apparatus for adjusting the size of a continuous casting mold

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2134829A (en) * 1935-11-30 1938-11-01 Henry E Mcwane Mold
US3286973A (en) * 1964-12-30 1966-11-22 Edmund Q Sylvester Mold clamping apparatus
US3340926A (en) * 1964-07-14 1967-09-12 Sylvester Entpr Casting apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2134829A (en) * 1935-11-30 1938-11-01 Henry E Mcwane Mold
US3340926A (en) * 1964-07-14 1967-09-12 Sylvester Entpr Casting apparatus
US3286973A (en) * 1964-12-30 1966-11-22 Edmund Q Sylvester Mold clamping apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851377A (en) * 1973-03-27 1974-12-03 D Dumas Sealing of metal bars in carbonized blocks
US3888453A (en) * 1974-04-12 1975-06-10 Amsted Ind Inc Top block stop for applying a longitudinal force to the top block of a pressure casting mold
US4487249A (en) * 1982-10-18 1984-12-11 United States Steel Corporation Method and apparatus for adjusting the size of a continuous casting mold

Also Published As

Publication number Publication date
DE2138374C3 (ja) 1973-10-18
DE2138374A1 (de) 1972-03-02
CA965934A (en) 1975-04-15
SE376182B (ja) 1975-05-12
JPS5114445B1 (ja) 1976-05-10
DE2138374B2 (de) 1973-03-29

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Legal Events

Date Code Title Description
AS Assignment

Owner name: AMSTED INDUSTRIES INCORPORATED, A CORP. OF DE., IL

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:FIRST NATIONAL BANK OF CHICAGO, AS AGENT;REEL/FRAME:005070/0731

Effective date: 19880831