EP0085675A1 - Mold box with means to support heater wires for making ceramic dies - Google Patents

Mold box with means to support heater wires for making ceramic dies

Info

Publication number
EP0085675A1
EP0085675A1 EP19810902401 EP81902401A EP0085675A1 EP 0085675 A1 EP0085675 A1 EP 0085675A1 EP 19810902401 EP19810902401 EP 19810902401 EP 81902401 A EP81902401 A EP 81902401A EP 0085675 A1 EP0085675 A1 EP 0085675A1
Authority
EP
European Patent Office
Prior art keywords
mold
rods
mold box
wires
box
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.)
Withdrawn
Application number
EP19810902401
Other languages
German (de)
French (fr)
Inventor
Hilton F. Stone Jr.
James R. Dillner
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.)
Raytheon Technologies Corp
Original Assignee
United Technologies Corp
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 United Technologies Corp filed Critical United Technologies Corp
Publication of EP0085675A1 publication Critical patent/EP0085675A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/0056—Means for inserting the elements into the mould or supporting them in the mould

Definitions

  • the die is used in hot forming sheet metal parts.
  • the heating wires usually nichrome be uniformly spaced apart and uniformly spaced from the operative guide surfaces. This becomes a major problem when the die surfaces are irregular as needed in forming irregularly curved work piece configurations.
  • the wires must be securely fixed while the ceramic is being positioned in the mold in which the die is formed but the wires mtist be readily releasable from the supporting structure in order to remove this structure from the ceramic of the die.
  • the wires must be securely held in position since the positioning of the ceramic in the mold generally includes a vibration of the mold.
  • a feature of this invention is an arrangement of a number of supporting rods for each of the heating wires with the wires releasably held on the ends of the rods during the positioning of the ceramic in the mold.
  • Another feature is the use of a releasable device for the wires that will not affect the mold in any detrimental way.
  • the device includes a plurality of rod supports removably attached to the mold with each support carrying a plurality of wire support rods extending into the mold cavity with the ends of the rods uniformly spaced from the surface of the mold on which the ceramic is to be formed.
  • Each rod has a slot in the end to receive a heater wire and a flexible element such as string extends around the heater wire and is brought up on the opposite, sides of the rod to secure at the outer end of the rod to hold the heater wire in place.
  • the rods are generally uniformly spaced in the rod support so as to hold the heater wires in uniformly spaced relation to each other. Upon release of the retention devices the rod can be withdrawn from the ceramic leaving the heater wires embedded therein. in the desired position.
  • the heater wires are individually held in the end walls of the mold by releasable tapered plugs.
  • Fig. 1 is a perspective view of the mold box with parts broken away.
  • Fig. 2 is a sectional view along line 2-2 of Fig. 1.
  • Fig. 3 is a sectional view at right angle to Fig. 2 on the line 3-3 of Fig . 2 .
  • Fig. 4 is a detail of the heater wire end of the support rod.
  • Fig. 5 is a detail of the other end of the support rod.
  • Fig. 6 is a detail of the plug for the ends of the heater wire.
  • the ceramic die is formed in a mold box 2 having in the bottom thereof a surface 4, Fig. 2 , contoured to the shape of the die to be formed. It will be understood that two mating dies are made between which the sheet metal is positioned and heated to conform to the contour of the mating dies.
  • the heater wires 6 extend ing in parallel relation to one another and in uniformly spaced relation to the surface 4 are held in the end walls 8 and 10 of the mold box by tapered plugs 12.
  • the heater wires are generally nichrome wire and are enclosed in a tube 14 the latter being generally plastic and this plastic is burned out during curing of the ceramic.
  • the heater wires in the tubes are held in position while the ceramic is placed in the mold by rows of rods 16 , each row extending down from a rod support 18 in the form of a bar removably held as by screws 20 at opposite ends engaging the side walls of the mold.
  • These supports extend at right angles to the heater wires and thus the several rods in each support rod are uniformly spaced so that one rod engages each wire to hold the wires in the desired spaced relation.
  • each heater wire is supported at spaced points along its length so that it is securely held in position although the individual wires are bent to conform to the contour of the mold surface.
  • the number of rod supports may vary depending upon the irregularity of the mold surface and the stiffness of the heater wire. As will be apparent the bottom ends of all the rods are uniformly spaced from the mold surface.
  • Each rod has a notch 22 at the bottom to receive the heater wire and is held therein by a string 24 having a loop 26 to engage a wire the string then extending upward along opposite sides of the rod to be held at the top end of each rod as by a fastener 28.
  • This fastener may be a plug 30 engaging the string and clamping it in a recess 32 in the end of the rod.
  • the ceramic material of the die is placed in the mold and surrounds the heater wires and the ends of the rods.
  • the mold is generally vibrated to assure that the ceramic material fills the mold completely and fully encloses the wires. Obviously the ceramic must form an unbroken surface where it engages the mold surface in order to assure a suitable forming surface when the dies are in use.
  • the strings on all the rods are released at the upper ends of the rods and the rods may then be withdrawn from the ceramic leaving the wires in position.
  • the mold is then filled further to the desired die thickness with some of this mold material filling the rod holes.
  • the strings may remain in the ceramic as they present no stress areas and will burn out while curing the ceramic.
  • the tapered plugs are released from the end walls of the box so that the ends of the heater wires are free to be withdrawn from these end walls.
  • the individual rods may be held in the rod support by set screws 34 in the supports. This will then permit adjustment of any of the rods individually in adapting the mold to the production of the die having a different die forming surface.
  • the rods are described as rods it may be understood that for purpose of weight reduction the rods may be tubes and the tubes will function in the same manner as would the solid rods.
  • the heater wire has been described just as a heater wire but it is normally provided as above stated with a plastic covering. It will be understood that when the mold is cured the plastic tube that surrounds the wire will burn out leaving the heater wire a loose fit within the space provided by the tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Furnace Details (AREA)
  • Moulds, Cores, Or Mandrels (AREA)

Abstract

Une boîte à moule (2) est destinée au moulage d'une matrice en céramique ayant des fils électriques espacés de chauffage noyés à l'intérieur. Des supports de tiges amovibles (18) supportent des tiges (16) qui s'étendent en relation de proximité par rapport à la surface du moule dans la boîte à moule (2). Les tiges (16) supportent des tiges chauffantes (6) en relation espacée par rapport à la surface du moule. Des bouchons coniques amovibles (12) maintiennent les fils électriques chauffants (6) dans les parois extrêmes (8, 10) de la boîte à moule (2). Les tiges (16) sont retirées après que les fils chauffants (6) ont été recouverts avec un matériau céramique. Un matériau céramique supplémentaire est ajouté pour donner l'épaisseur désirée à la matrice.A mold box (2) is intended for molding a ceramic matrix having spaced electric heating wires embedded therein. Removable rod supports (18) support rods (16) which extend in close relation to the surface of the mold in the mold box (2). The rods (16) support heating rods (6) in spaced relation to the surface of the mold. Removable conical plugs (12) hold the electric heating wires (6) in the end walls (8, 10) of the mold box (2). The rods (16) are removed after the heating wires (6) have been covered with a ceramic material. Additional ceramic material is added to give the desired thickness to the matrix.

Description

MOLD BOX WITH MEANS TO SUPPORT HEATER WIRES FOR MAKING CERAMIC DIES
Method and Apparatus for Supporting Die Heater Wires
Technical Field
A method and apparatus for supporting the die heater wires in position while embedding them in ceramic to form the body of the die. The die is used in hot forming sheet metal parts.
Background Art
To assure uniform heating of the forming surfaces of cooperating dies it is essential that the heating wires usually nichrome be uniformly spaced apart and uniformly spaced from the operative guide surfaces. This becomes a major problem when the die surfaces are irregular as needed in forming irregularly curved work piece configurations. The wires must be securely fixed while the ceramic is being positioned in the mold in which the die is formed but the wires mtist be readily releasable from the supporting structure in order to remove this structure from the ceramic of the die. The wires must be securely held in position since the positioning of the ceramic in the mold generally includes a vibration of the mold.
Disclosure of the Invention
A feature of this invention is an arrangement of a number of supporting rods for each of the heating wires with the wires releasably held on the ends of the rods during the positioning of the ceramic in the mold.
Another feature is the use of a releasable device for the wires that will not affect the mold in any detrimental way.
Another feature is the arrangement for removing the supporting rods when the ceramic has been placed in the mold and is hard enough to hold the wires in position. According to the invention the device includes a plurality of rod supports removably attached to the mold with each support carrying a plurality of wire support rods extending into the mold cavity with the ends of the rods uniformly spaced from the surface of the mold on which the ceramic is to be formed. Each rod has a slot in the end to receive a heater wire and a flexible element such as string extends around the heater wire and is brought up on the opposite, sides of the rod to secure at the outer end of the rod to hold the heater wire in place. The rods are generally uniformly spaced in the rod support so as to hold the heater wires in uniformly spaced relation to each other. Upon release of the retention devices the rod can be withdrawn from the ceramic leaving the heater wires embedded therein. in the desired position. The heater wires are individually held in the end walls of the mold by releasable tapered plugs.
The foregoing and other objects, features and advantages of the present invention will become more apparent in the light of the following detailed description of preferred embodiments thereof as shown in the accompanying drawing.
Brief Description Of The Drawing
Fig. 1 is a perspective view of the mold box with parts broken away.
Fig. 2 is a sectional view along line 2-2 of Fig. 1.
Fig. 3 is a sectional view at right angle to Fig. 2 on the line 3-3 of Fig . 2 .
Fig. 4 is a detail of the heater wire end of the support rod.
Fig. 5 is a detail of the other end of the support rod.
Fig. 6 is a detail of the plug for the ends of the heater wire.
Best Mode For Carrying. Out The Invention
The ceramic die is formed in a mold box 2 having in the bottom thereof a surface 4, Fig. 2 , contoured to the shape of the die to be formed. It will be understood that two mating dies are made between which the sheet metal is positioned and heated to conform to the contour of the mating dies. The heater wires 6 extend ing in parallel relation to one another and in uniformly spaced relation to the surface 4 are held in the end walls 8 and 10 of the mold box by tapered plugs 12. The heater wires are generally nichrome wire and are enclosed in a tube 14 the latter being generally plastic and this plastic is burned out during curing of the ceramic.
The heater wires in the tubes are held in position while the ceramic is placed in the mold by rows of rods 16 , each row extending down from a rod support 18 in the form of a bar removably held as by screws 20 at opposite ends engaging the side walls of the mold. These supports extend at right angles to the heater wires and thus the several rods in each support rod are uniformly spaced so that one rod engages each wire to hold the wires in the desired spaced relation. With the plurality of spaced rod supports each heater wire is supported at spaced points along its length so that it is securely held in position although the individual wires are bent to conform to the contour of the mold surface. Obviously the number of rod supports may vary depending upon the irregularity of the mold surface and the stiffness of the heater wire. As will be apparent the bottom ends of all the rods are uniformly spaced from the mold surface.
Each rod has a notch 22 at the bottom to receive the heater wire and is held therein by a string 24 having a loop 26 to engage a wire the string then extending upward along opposite sides of the rod to be held at the top end of each rod as by a fastener 28. This fastener may be a plug 30 engaging the string and clamping it in a recess 32 in the end of the rod.
The ceramic material of the die is placed in the mold and surrounds the heater wires and the ends of the rods. The mold is generally vibrated to assure that the ceramic material fills the mold completely and fully encloses the wires. Obviously the ceramic must form an unbroken surface where it engages the mold surface in order to assure a suitable forming surface when the dies are in use. After the ceramic is in position and has hardened enough to hold the heater wires in place the strings on all the rods are released at the upper ends of the rods and the rods may then be withdrawn from the ceramic leaving the wires in position. The mold is then filled further to the desired die thickness with some of this mold material filling the rod holes. The strings may remain in the ceramic as they present no stress areas and will burn out while curing the ceramic.
In removing the mole box from the ceramic die the tapered plugs are released from the end walls of the box so that the ends of the heater wires are free to be withdrawn from these end walls. To make the device above described adaptable to more general use the individual rods may be held in the rod support by set screws 34 in the supports. This will then permit adjustment of any of the rods individually in adapting the mold to the production of the die having a different die forming surface. Although the rods are described as rods it may be understood that for purpose of weight reduction the rods may be tubes and the tubes will function in the same manner as would the solid rods.
In the above description the heater wire has been described just as a heater wire but it is normally provided as above stated with a plastic covering. It will be understood that when the mold is cured the plastic tube that surrounds the wire will burn out leaving the heater wire a loose fit within the space provided by the tube.
Although the invention has been shown and described with respect to the preferred embodiment thereof, it should be understood by those skilled in the art that various changes and omissions in the form and detail thereof may be made therein without departing from the spirit and scope of the invention.

Claims

Claims
1. A mold box for making a ceramic die said box having: a bottom mold surface to form the operative surface of the die; side walls and end walls on said box; support bars releasably secured to said side walls at points above the mold surface; a plurality of parallel rods carried by said bars and extending downwardly into spaced relation to said mold surface, said bars being notched at their lower ends; heater wires extending across said mold surface in spaced relation thereto said wires engaging in the notches in the rods; and means for holding the wires releasably. in the notches in the rods.
2. A mold box as in claim 1 in which each heater wire has a surrounding plastic tube.
3. A mold box as in claim 1 in which said wire holding means are releasable at the upper ends of the rods..
4. A mold box as in claim 1 in which each said wire holding means is a loop of string engaging the wire and extending upwardly along the rod to be secured at the top thereof.
5. A mold box as in claim 1 in which the support bars are on the side walls and the heater wires extend between the end walls being positioned at right angles to the support rods.
6. A mold box as in claim 5 in which one rod on each support is provided for engagement with each individual heater wire.
7. A mold box as in claim 1 in which the rods are ad justable in the support bars.
EP19810902401 1981-08-12 1981-08-12 Mold box with means to support heater wires for making ceramic dies Withdrawn EP0085675A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1981/001101 WO1983000457A1 (en) 1981-08-12 1981-08-12 Mold box with means to support heater wires for making ceramic dies

Publications (1)

Publication Number Publication Date
EP0085675A1 true EP0085675A1 (en) 1983-08-17

Family

ID=22161372

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810902401 Withdrawn EP0085675A1 (en) 1981-08-12 1981-08-12 Mold box with means to support heater wires for making ceramic dies

Country Status (7)

Country Link
EP (1) EP0085675A1 (en)
JP (1) JPS58501316A (en)
CA (1) CA1176039A (en)
DE (1) DE3152924C2 (en)
FR (1) FR2511293A1 (en)
GB (1) GB2114933B (en)
WO (1) WO1983000457A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3472231D1 (en) * 1984-04-30 1988-07-28 United Technologies Corp Apparatus for embedding flexible conduits in molded articles
JPH0539853Y2 (en) * 1988-03-30 1993-10-08
CN100351027C (en) * 2006-04-28 2007-11-28 哈尔滨工业大学 Quick, intelligent and environment-friendly casting mould and method for manufacturing the same

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA663300A (en) * 1963-05-21 Barredo De Valenzuela Ricardo Pre-stressed concrete
US2408149A (en) * 1943-08-06 1946-09-24 Leslie W Miller Apparatus for embedding an elongated flexible member in a moldable material
US2958507A (en) * 1956-11-15 1960-11-01 Fmc Corp Cable hold down device for prestressed concrete casting beds
US3041702A (en) * 1957-10-15 1962-07-03 United States Steel Corp Method of making a prestressed reinforced concrete structure
US3049786A (en) * 1958-05-28 1962-08-21 Cordis W Jones Apparatus for making prestressed structural members
US3808569A (en) * 1968-06-12 1974-04-30 Science Res Council Electromagnet with windings embedded in and insulated by compressively stressed concrete
JPS539908Y2 (en) * 1972-06-16 1978-03-15
JPS534071Y2 (en) * 1972-07-10 1978-02-01
US3861096A (en) * 1973-01-26 1975-01-21 Harold R Emmons Spaced bar for concrete reinforcing steel mats
JPS5021488U (en) * 1973-06-25 1975-03-11
US3960356A (en) * 1974-10-24 1976-06-01 Adams John H Anchor bolt holder
GB1592441A (en) * 1978-01-19 1981-07-08 Tempra Therm 1972 Pty Ltd Thermocouples
US4228985A (en) * 1978-02-15 1980-10-21 Gaudelli Edmond N Apparatus for producing molded concrete products
FR2423314A2 (en) * 1978-04-17 1979-11-16 Produits Refractaires PROCESS FOR OBTAINING HIGH PRECISION MOLDED PARTS BY FILTRATION IN FIBROUS MATERIALS CONTAINING METAL INSERTS
SE412341C (en) * 1978-05-30 1989-04-17 Yxhult Ab PROFILING DEVICE
US4261544A (en) * 1979-03-12 1981-04-14 Addison Elvin R Element locator for concrete

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8300457A1 *

Also Published As

Publication number Publication date
DE3152924C2 (en) 1990-07-05
GB8306778D0 (en) 1983-04-20
JPS58501316A (en) 1983-08-11
FR2511293B1 (en) 1985-04-19
FR2511293A1 (en) 1983-02-18
CA1176039A (en) 1984-10-16
GB2114933A (en) 1983-09-01
GB2114933B (en) 1985-07-24
JPH0351562B2 (en) 1991-08-07
WO1983000457A1 (en) 1983-02-17
DE3152924T1 (en) 1983-09-08

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Inventor name: DILLNER, JAMES R.

Inventor name: STONE, HILTON F. JR.