CA1176039A - Method and apparatus for supporting die heater wires - Google Patents
Method and apparatus for supporting die heater wiresInfo
- Publication number
- CA1176039A CA1176039A CA000389454A CA389454A CA1176039A CA 1176039 A CA1176039 A CA 1176039A CA 000389454 A CA000389454 A CA 000389454A CA 389454 A CA389454 A CA 389454A CA 1176039 A CA1176039 A CA 1176039A
- Authority
- CA
- Canada
- Prior art keywords
- mold
- rods
- box
- wires
- wire
- 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
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
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)
- Furnace Details (AREA)
Abstract
Method and Apparatus for Supporting Die Heater Wires Abstract A mold box for making a ceramic die in which sup-port bars removably secured to the mold box support a plurality of rods extending into close relationship to the operative mold surface in the box for supporting the heater wires in predetermined spaced relation to the operative mold surface with the support bars being removable so that the rods may all be removed from the die material after it has been placed in the mold.
Description
~L'7ti~ 9 Description 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 ceram-ic 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 h~ e wires usually ~K~} 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 fixedwhile the ceramic is being positioned in the mold in which the die is formed but the wires must 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 posi-tioning 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 ~ Tf~ k ~76(~35~
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.
In accordance with a particular embodiment of the invention, there is provided a mold box for making a ceramic die. The box-has a bottom mold surface to form the operative surface of the die and side walls and end walls on the box. Support bars are releasably secured to the side walls at points above the mold surface. A
plurality of parallel rods are carried by the bars and extend downwardly into spaced relation to the mold sur-face, the bars being notched at their lower ends. Heater wires extend across the mold surface in spaced relation thereto, the wires engaging in the notches in the rods.
Means are provided for holding the wires releasably in the notches in the rods.
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 flexibIe 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 indivi-dually held in the end walls of the mold by releasable ~176(~3~
-2a-apered plugs.
The foregoing and other objects, features and ad-vantages of the present invention will become more apparent in the light of the following detailed des-cription of preferred embodiments thereof as shown inthe 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.
:~7~339 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 aetail 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, con-toured to the shape of the die to be forrned, It will be understood that two mating dies are made between which the sheet metal is positioned and heated to con-form to the contour of the mating dies, The heater wires 6 extending 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 ~ichrome T~ 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 bar 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 leng-th so that it is securely held in position although the individual wires 6~3~
are bent to conform to the contour of the mold surface.
Obvlously 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 hav-ing a loop 26 to engage a wire the string then extend-ing upward along opposite sides of the rod to be heldat 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 assur~ 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 a' the upper ends of the rods and the rods may then ~e withdrawn from the ceramic leaving the wires in position. The mold is then filled further to the desired die thick-ness 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 mold 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 ~7~e~3~
above described adaptable to more general use the in-dividual 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 dle having a dif-ferent die forming surface. Although the rods are described as rods it may be understood that for pur-pose 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 t~e 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 em~odiment 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.
Background Art To assure uniform heating of the forming surfaces of cooperating dies it* is essential that the heating h~ e wires usually ~K~} 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 fixedwhile the ceramic is being positioned in the mold in which the die is formed but the wires must 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 posi-tioning 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 ~ Tf~ k ~76(~35~
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.
In accordance with a particular embodiment of the invention, there is provided a mold box for making a ceramic die. The box-has a bottom mold surface to form the operative surface of the die and side walls and end walls on the box. Support bars are releasably secured to the side walls at points above the mold surface. A
plurality of parallel rods are carried by the bars and extend downwardly into spaced relation to the mold sur-face, the bars being notched at their lower ends. Heater wires extend across the mold surface in spaced relation thereto, the wires engaging in the notches in the rods.
Means are provided for holding the wires releasably in the notches in the rods.
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 flexibIe 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 indivi-dually held in the end walls of the mold by releasable ~176(~3~
-2a-apered plugs.
The foregoing and other objects, features and ad-vantages of the present invention will become more apparent in the light of the following detailed des-cription of preferred embodiments thereof as shown inthe 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.
:~7~339 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 aetail 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, con-toured to the shape of the die to be forrned, It will be understood that two mating dies are made between which the sheet metal is positioned and heated to con-form to the contour of the mating dies, The heater wires 6 extending 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 ~ichrome T~ 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 bar 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 leng-th so that it is securely held in position although the individual wires 6~3~
are bent to conform to the contour of the mold surface.
Obvlously 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 hav-ing a loop 26 to engage a wire the string then extend-ing upward along opposite sides of the rod to be heldat 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 assur~ 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 a' the upper ends of the rods and the rods may then ~e withdrawn from the ceramic leaving the wires in position. The mold is then filled further to the desired die thick-ness 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 mold 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 ~7~e~3~
above described adaptable to more general use the in-dividual 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 dle having a dif-ferent die forming surface. Although the rods are described as rods it may be understood that for pur-pose 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 t~e 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 em~odiment 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 (7)
1. A mold box for making a ceramic die said box hav-ing:
a bottom mold surface to form the operative sur-face 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 rods 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.
a bottom mold surface to form the operative sur-face 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 rods 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 hold-ing 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 be-tween 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 bar 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.
Applications Claiming Priority (2)
| 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 |
| US8101101 | 1981-08-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1176039A true CA1176039A (en) | 1984-10-16 |
Family
ID=22161372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000389454A Expired CA1176039A (en) | 1981-08-12 | 1981-11-04 | Method and apparatus for supporting die heater wires |
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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH069812B2 (en) * | 1984-04-30 | 1994-02-09 | ユナイテッド・テクノロジ−ズ・コ−ポレイション | Apparatus and method for retaining ducts 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)
| 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 |
-
1981
- 1981-08-12 JP JP50289181A patent/JPS58501316A/en active Granted
- 1981-08-12 DE DE3152924T patent/DE3152924C2/en not_active Expired - Lifetime
- 1981-08-12 GB GB08306778A patent/GB2114933B/en not_active Expired
- 1981-08-12 EP EP19810902401 patent/EP0085675A1/en not_active Withdrawn
- 1981-08-12 WO PCT/US1981/001101 patent/WO1983000457A1/en active Application Filing
- 1981-11-04 CA CA000389454A patent/CA1176039A/en not_active Expired
-
1982
- 1982-01-07 FR FR8200142A patent/FR2511293A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| GB2114933A (en) | 1983-09-01 |
| FR2511293B1 (en) | 1985-04-19 |
| JPS58501316A (en) | 1983-08-11 |
| WO1983000457A1 (en) | 1983-02-17 |
| DE3152924C2 (en) | 1990-07-05 |
| EP0085675A1 (en) | 1983-08-17 |
| JPH0351562B2 (en) | 1991-08-07 |
| FR2511293A1 (en) | 1983-02-18 |
| GB8306778D0 (en) | 1983-04-20 |
| GB2114933B (en) | 1985-07-24 |
| DE3152924T1 (en) | 1983-09-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |