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)
• Moulds, Cores, Or Mandrels (AREA)
• Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=22161372

Family Applications (1)

Country Status (7)

Families Citing this family (3)

Family Cites Families (16)

• 1981
  • 1981-08-12 WO PCT/US1981/001101 patent/WO1983000457A1/en active Application Filing
  • 1981-08-12 JP JP56502891A patent/JPS58501316A/ja active Granted
  • 1981-08-12 EP EP19810902401 patent/EP0085675A1/en not_active Withdrawn
  • 1981-08-12 GB GB08306778A patent/GB2114933B/en not_active Expired
  • 1981-08-12 DE DE3152924T patent/DE3152924C2/de not_active Expired - Lifetime
  • 1981-11-04 CA CA000389454A patent/CA1176039A/en not_active Expired
• 1982
  • 1982-01-07 FR FR8200142A patent/FR2511293A1/fr active Granted

Non-Patent Citations (1)

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