CA2262688A1 - Robotic co2 tire mold cleaning - Google Patents
Robotic co2 tire mold cleaning Download PDFInfo
- Publication number
- CA2262688A1 CA2262688A1 CA002262688A CA2262688A CA2262688A1 CA 2262688 A1 CA2262688 A1 CA 2262688A1 CA 002262688 A CA002262688 A CA 002262688A CA 2262688 A CA2262688 A CA 2262688A CA 2262688 A1 CA2262688 A1 CA 2262688A1
- Authority
- CA
- Canada
- Prior art keywords
- tire mold
- pellets
- mold
- rotating
- insulated enclosure
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
- B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/003—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods using material which dissolves or changes phase after the treatment, e.g. ice, CO2
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/08—Abrasive blasting machines or devices; Plants essentially adapted for abrasive blasting of travelling stock or travelling workpieces
- B24C3/083—Transfer or feeding devices; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/18—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions
- B24C3/20—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by turntables
- B24C3/22—Apparatus using nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/70—Maintenance
- B29C33/72—Cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0662—Accessories, details or auxiliary operations
- B29D2030/0663—Mould maintenance, e.g. cleaning, washing, repairing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2030/00—Pneumatic or solid tyres or parts thereof
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A method and apparatus for cleaning molds, particularly tire molds (16) using pellets of a frozen gas and a robotically controlled apparatus are disclosed. A heated mold (16) is conveyed into an insulated and sound-proof enclosure (34) where a robot arm with a nozzle (52) mounted on the robot arm directs frozen CO2 pellets against the mold surface to be cleaned. The mold (16) is rotated on a rotary table (40) to clean the entire mold surface. The mold (16) is then removed from the enclosure (34) on a conveyor (82). The preferred frozen gas is CO2 because it is non-abrasive to the tire mold surfaces and also cleans the microvents of the tire mold (16).
Description
W O 98/07548 PCT~US96/13521 ROBOl~C CO211RE MOLD CLEANnNG
Technical Field This invention pertains to the art of methods and apparatuses for cleaning tire molds, and more specifically to methods and apparatuses for cleaning tire molds using pellets of frozen carbon dioxide, hereafter referred to as CO~.
Background Art In the past, two-piece tire molds and segmented tire molds were cleaned in semi-automatic machines which used metal shot, plastic beads, or glass beads as the cleaning or blasting agent. All of these blasting agents were abrasive and caused rapid wear to tire mold lettering and sidewall designs. Additionally, these blasting agents and m~chinf!s were incapable of removing trapped materials from microvents in the tire molds. Therefore, microvents had to be drilled manually to remove trapped materials.
Another problem encountered by the past machines was recovery of the blasting agent, such as sand or glass beads. After the blasting agent had been used to clean a tire mold, it had to be recovered or removed. The recovery of the blasting agent increased the time n~cecs~ry to clean tire molds and caused a cont~min~tion problem in the plant.
One such abrasive tire blasting apparatus is found in U.S. Patent No. 3,905,155 to Smith et al., which discloses a m~rhin.o that provides a removable hood for positioning over a tire mold and blasts the tire mold with abrasive glass beads.
Applicants recognized a need for a method and apparatus for cle~ning tire molds with a blasting agent that was less abrasive than the prior blasting agents and required less recovery time. Additionally, a method and apparatus for cleaning the microvents of a tire mold was also needed.
The present invention contemplates a new and improved tire mold cle~ning method and apparatus which is simple in design, effective in use, and overcomes the foregoing difficulties and others while providing better and more advantageous overall results.
Disclosure of Invention In accordance with the present invention, a new and improved method and apparatus for cle~nin~ a mold, particularly a tire mold, is provided which uses CO2 pellets to clean the tire mold.
According to one aspect of the present invention there is provided an apparatus for cle~ning a tire mold with CO2 pellets directed against the molding surfaces of the tire mold.
The apparatus includes a sound-proof insulated enclosure for the tire mold, a rotatable support for positioning and tolati~-g the tire mold in the enclosure, a robot in the enclosure . , . ~ ..... ~
W O 98/07548 2 PCTrUS96113521 that has an arm moveable to select cleaning positions over the molding surfaces of the tire mold, a nozzle mounted on the arm and in communication with a source of CO2 pellets, a robot control apparatus for rotating the arm to position the nozzle over the molding surfaces to direct the CO2 pellets against the molding surfaces in a direction substantially perpendicular to the molding surfaces at different positions axially of the tire mold, and a power apparatus for rotating the rotatable support while the CO2 pellets are directed against the molding surfaces.
According to another aspect of the present invention there is provided a method of cleaning the tire mold with CO2 pellets directed against the molding surfaces of the tire mold. This method includes the steps of supporting the tire mold on a rotatable support in a sound-proof insulated enclosure, and communicating CO2 pellets to the molding surfaces from a pellet mixer by air pressure to a nozzle adjacent the molding surfaces and moving the nozzle axially within the tire mold while rotating the tire mold about an axis on the rotatable support to traverse the molding surfaces.
One advantage of the present invention is that the cleaning apparatus is completely automatic.
Another advantage of the present invention is that the CO2 pellets are non-abrasive and do not damage the tire mold.
Another advantage of the present invention is that the CO2 pellets melt and evaporate after contacting the tire mold, thereby eliminating the need to recover used blasting agents.
Another advantage of the present invention is that the frozen CO2 pellets also clean microvents in the tire molds, thereby elimin~ting the need to drill the microvents manll~lly.
Still other benefits and advantages of the invention will become apparent to those skilled in the art to which it pertains upon a reading and understanding of the following detailed specification.
Brief Description of Drawings The invention may take physical form in certain parts and arrangement of parts, a })refc;ll~d embodiment of which will be described in detail in this specification and illustrated in the accompanying drawings which form a part hereof and herein:
Figure 1 is a schematic view of a robotic CO2 cleaning apparatus;
Figure 2 is a detailed view of a spray nozzle with a closed flow regulator and safety shut off;
Figure 3 is a detailed view of the spray nozzle like Figure 2 with an open CA 02262688 l999-02-04 W O 98/07548 PCTrUS96/13521 flow regulator;
Figure 4 is a plan view of a plef~.led embodiment of a robotic CO~ cleaning apparatus;
Figure 5 is a front election of the robotic CO2 cleaning apparatus of Figure 4;
and, Figure 6 is an enlarged fragmentary view of one of the rotary tab}es and the spray nozzle as used with robotic CO2 cleaning apparatus of ~igures 3, 4, and 5.Detailed Description of the Invention Referring now to the drawings wherein the showings are for purposes of illustrating one embodiment of the invention only and not for purposes of limiting the same, Figure 1 shows a schematic view of a robotic CO2 cleaning apparatus 10. A segmented tire mold 16, is placed onto an entry conveyor 22 by a hoist 28. The tire mold 16 is heated with steam so that the tire mold placed on the entry conveyor 22 is heated to a temperature ofapproximately 350~F (177~C). The tire mold 16 is heated to near the curing temperature of the tire to facilitate the rapid removal of material from the tire mold 16 during the cleaning process.
The entry conveyor 22 conveys the tire mold 16 through an opening 32 into an enclosure 34 that is preferably sound-proof and insulated. The opening 32 may include a door (not shown) that closes the opening when the cle~ning ap~ a~us 10 is in operation.
20 The enclosure 34 is preferably sound-proof to reduce noise that may be objectionable to employees working around the cle~ning ap?a~allls 10. The enclosure 34 is preferably incul~t~d to m~int~in the temperature of the tire mold 16 as near the tire curing temperatu~e as is feasible.
Inside the enclosure 34, the tire mold 16 is transferred to a rotary table ~0 and 2~ cleaned by a robot 46 directing frozen CO2 pellets against the mold surfaces. The frozen CO2 pellets preferably have diameters between 0.04 inch and 0.12 inch and temperatures of about -80~F (-62~C). Frozen CO2 is ~ fe-led because such pellets are non-abrasive, thereby extending the life of the tire mold 16 and improving the appearance of the tire produced by the tire mold. Additionally, the frozen CO2 e~oldtes on contact with the tire 3~ mold 16, producing a pres~ulized gas that cleans out the microvents of the tire mold. Also, since the CO2 pellets e~/~old~e on contact with the tire mold half 16, hou~el~eeping is improved because no blasting agents are deposited on the other equipment or on the floor..
Before cleaning, the segmented tire mold 16 need not be di~ssembled and is , . , . . ~
conveyed onto a rotary table 40 rotatable about the axis and controlled by a servomotor (not shown). The rotary table 40 rotates the tire mold 16 past a spray nozzle 52 of a robot 46.
The spray nozzle 52 is attached to the end of the robot 46. The robot 46 is multi-directional, preferably being a six axis robot, so that the spray nozzle 52 may be adjusted to clean an entire tire mold 16. The spray nozzle 52 is preferably adjusted by the robot 46 to aim a stream of frozen CO2 pellets in a direction normal to the surface of the tire mold 16 that is being cleaned. The speed at which the rotary table 40 rotates is adjustable as is the robot 46 positioning of the spray nozzle 52 to optimize the cleaning action of the cleaning apparatus 10. The rotational speed of the rotary table 40 and the position of the spray nozzle 52 at the end of the robot 46 are preferably regulated by a fully programmable robot controller 58. Also a safety shut off 72 is interposed between the spray nozzle ~2 and the robot to shut down the apparatus if the spray nozzle engages the mold 16 during the cleaning.
- Figure 2 shows a close-up view of the spray nozzle 52. The spray nozzle 52 is preferably curved slightly to enable the robot 46 to position the spray nozzle to clean a variety of different curved surfaces of the tire mold 16. The end of the spray nozzle 52 has a flow regulator 64 that regulates the flow of frozen CO2 pellets through the end of the spray nozzle. The flow regulator 64 may be closed completely to prohibit the flow of frozen CO2 pellets, or, as shown in Figure 3, the flow regulator may be opened up to a diameter 70 of 1.0 inch to increase the flow of frozen CO2 pellets.
Liquid nitrogen (Nz) may be injected into the air delivery system to super cool the frozen CO2 pellets to ensure that the pellets do not disintegrate or evaporate before they are delivered as a blasting agent.
With further reference to Figure 1, after the tire mold 16 is cleaned by the cleanin~
apparatus lO, a mold pusher 76 pushes the tire mold 16 off the rotary table 40 and onto an exit conveyor 82. The exit conveyor 82 conveys the tire mold 16 out of the enclosure 34 through a second opening 88 in the enclosure. The second opening 88 may have a door (not shown) which closes the opening when the cleaning a~ atus is in operation. The tire mold 16 is then transferred to a staging conveyor 94 where it awaits transport back into the tire production process. A tire mold 16 may be cleaned in approximately ten minutes using the cle~ning apparatus 10.
Figures 4-6 show a prefelled embodiment of the invention. The robotic CO2 cleaning apparatus 10 is preferably enclosed in a special enclosure 100 that has two doors 106,108. The doors 106,108 open to allow a tire mold 16 to be placed in the enclosure 100, and then the doors are closed before the robotic CO2 cleaning apparatus is activated. The doors 106,108 preferably have windows to allow an operator to see the tire mold 16 as it is cleaned.
s As shown in Figures 4 and 5, this p,ef~.led embodiment features two rotary tables 114,116 located on opposite sides of the robot 46. Each rotary table 114,116 has a centering apparatus that consists of preferably three radially movable centering guide members 122 that operate to center a tire mold 16 or mold half on each rotary table about.an axis of rotation of the table after the tire mold half is placed on each of the rotary tables by the hoist 28. As with the previous embodiment, each tire mold 16 to be cleaned is heated to approximately 350~F (177~C) to optimize the cleaning procedure.
Once centered, the rotary tables 114,116 rotate each tire mold 16 as the robot 46 positions the spray nozzle 52 normal to the mold surface of one of the tire molds to be cleaned, as illustrated in Figure 6. The spray nozzle 52 shown in solid lines illustrates the position of the spray nozzle for cleaning the sidewall surface 128 of the tire mold 16. The spray nozzle 52a shown in dotted lines shows the position of the spray nozzle for cleaning the tread surface 130 of the tire mold 16. The spray nozzle 52b shown in dotted lines shows the position of the spray nozzle for cleanin~ the bead surface 132 of the tire mold half 16.
The rotary tables 114,116 rotate each tire mold 16 about an axis of the tab}es past the spray nozzle 52 for a specified number of rotations to ensure thorough cleaning. The number of rotations may be controlled by a robot controller (not shown) programmed to meet mold cle.~nin~ specifications, or an operator may manually control the cleaning of a tire mold 16 by controlling the number of rotations of one of the rotary tables 114,116 or the positioning of the robot 46. In the preferred embodiment of the present invention, the rotary tables 114,116 rotate from 2 rpm to 4 rpm for ten revolutions to clean each of the tread surfaces 130, the sidewall surfaces 128, and the bead surfaces 132 of the tire mold halves 16. The number of revolutions and speed of rotation may be adjusted as necess~ry.
While the preferred embodiment has been described with two rotary tables 114,116, any number of rotary tables may be employed that will fit around and be in reach of the ~0 robot 46. Also the robot 46 may be mounted on a movable support to service additional molds.
The preferred embodiments have been described, hereinabove. It will be apparent to those skilled in the art that the above apparatus and methods may incorporate changes and ......
W O 98/07548 PCT~US96/13521 modifications without departing from the general scope of this invention. It is intended to include all such modifications and alterations in so far as they come within the scope of the appended claims or the equivalents thereof.
Having thus described the invention, it is now claimed:
Technical Field This invention pertains to the art of methods and apparatuses for cleaning tire molds, and more specifically to methods and apparatuses for cleaning tire molds using pellets of frozen carbon dioxide, hereafter referred to as CO~.
Background Art In the past, two-piece tire molds and segmented tire molds were cleaned in semi-automatic machines which used metal shot, plastic beads, or glass beads as the cleaning or blasting agent. All of these blasting agents were abrasive and caused rapid wear to tire mold lettering and sidewall designs. Additionally, these blasting agents and m~chinf!s were incapable of removing trapped materials from microvents in the tire molds. Therefore, microvents had to be drilled manually to remove trapped materials.
Another problem encountered by the past machines was recovery of the blasting agent, such as sand or glass beads. After the blasting agent had been used to clean a tire mold, it had to be recovered or removed. The recovery of the blasting agent increased the time n~cecs~ry to clean tire molds and caused a cont~min~tion problem in the plant.
One such abrasive tire blasting apparatus is found in U.S. Patent No. 3,905,155 to Smith et al., which discloses a m~rhin.o that provides a removable hood for positioning over a tire mold and blasts the tire mold with abrasive glass beads.
Applicants recognized a need for a method and apparatus for cle~ning tire molds with a blasting agent that was less abrasive than the prior blasting agents and required less recovery time. Additionally, a method and apparatus for cleaning the microvents of a tire mold was also needed.
The present invention contemplates a new and improved tire mold cle~ning method and apparatus which is simple in design, effective in use, and overcomes the foregoing difficulties and others while providing better and more advantageous overall results.
Disclosure of Invention In accordance with the present invention, a new and improved method and apparatus for cle~nin~ a mold, particularly a tire mold, is provided which uses CO2 pellets to clean the tire mold.
According to one aspect of the present invention there is provided an apparatus for cle~ning a tire mold with CO2 pellets directed against the molding surfaces of the tire mold.
The apparatus includes a sound-proof insulated enclosure for the tire mold, a rotatable support for positioning and tolati~-g the tire mold in the enclosure, a robot in the enclosure . , . ~ ..... ~
W O 98/07548 2 PCTrUS96113521 that has an arm moveable to select cleaning positions over the molding surfaces of the tire mold, a nozzle mounted on the arm and in communication with a source of CO2 pellets, a robot control apparatus for rotating the arm to position the nozzle over the molding surfaces to direct the CO2 pellets against the molding surfaces in a direction substantially perpendicular to the molding surfaces at different positions axially of the tire mold, and a power apparatus for rotating the rotatable support while the CO2 pellets are directed against the molding surfaces.
According to another aspect of the present invention there is provided a method of cleaning the tire mold with CO2 pellets directed against the molding surfaces of the tire mold. This method includes the steps of supporting the tire mold on a rotatable support in a sound-proof insulated enclosure, and communicating CO2 pellets to the molding surfaces from a pellet mixer by air pressure to a nozzle adjacent the molding surfaces and moving the nozzle axially within the tire mold while rotating the tire mold about an axis on the rotatable support to traverse the molding surfaces.
One advantage of the present invention is that the cleaning apparatus is completely automatic.
Another advantage of the present invention is that the CO2 pellets are non-abrasive and do not damage the tire mold.
Another advantage of the present invention is that the CO2 pellets melt and evaporate after contacting the tire mold, thereby eliminating the need to recover used blasting agents.
Another advantage of the present invention is that the frozen CO2 pellets also clean microvents in the tire molds, thereby elimin~ting the need to drill the microvents manll~lly.
Still other benefits and advantages of the invention will become apparent to those skilled in the art to which it pertains upon a reading and understanding of the following detailed specification.
Brief Description of Drawings The invention may take physical form in certain parts and arrangement of parts, a })refc;ll~d embodiment of which will be described in detail in this specification and illustrated in the accompanying drawings which form a part hereof and herein:
Figure 1 is a schematic view of a robotic CO2 cleaning apparatus;
Figure 2 is a detailed view of a spray nozzle with a closed flow regulator and safety shut off;
Figure 3 is a detailed view of the spray nozzle like Figure 2 with an open CA 02262688 l999-02-04 W O 98/07548 PCTrUS96/13521 flow regulator;
Figure 4 is a plan view of a plef~.led embodiment of a robotic CO~ cleaning apparatus;
Figure 5 is a front election of the robotic CO2 cleaning apparatus of Figure 4;
and, Figure 6 is an enlarged fragmentary view of one of the rotary tab}es and the spray nozzle as used with robotic CO2 cleaning apparatus of ~igures 3, 4, and 5.Detailed Description of the Invention Referring now to the drawings wherein the showings are for purposes of illustrating one embodiment of the invention only and not for purposes of limiting the same, Figure 1 shows a schematic view of a robotic CO2 cleaning apparatus 10. A segmented tire mold 16, is placed onto an entry conveyor 22 by a hoist 28. The tire mold 16 is heated with steam so that the tire mold placed on the entry conveyor 22 is heated to a temperature ofapproximately 350~F (177~C). The tire mold 16 is heated to near the curing temperature of the tire to facilitate the rapid removal of material from the tire mold 16 during the cleaning process.
The entry conveyor 22 conveys the tire mold 16 through an opening 32 into an enclosure 34 that is preferably sound-proof and insulated. The opening 32 may include a door (not shown) that closes the opening when the cle~ning ap~ a~us 10 is in operation.
20 The enclosure 34 is preferably sound-proof to reduce noise that may be objectionable to employees working around the cle~ning ap?a~allls 10. The enclosure 34 is preferably incul~t~d to m~int~in the temperature of the tire mold 16 as near the tire curing temperatu~e as is feasible.
Inside the enclosure 34, the tire mold 16 is transferred to a rotary table ~0 and 2~ cleaned by a robot 46 directing frozen CO2 pellets against the mold surfaces. The frozen CO2 pellets preferably have diameters between 0.04 inch and 0.12 inch and temperatures of about -80~F (-62~C). Frozen CO2 is ~ fe-led because such pellets are non-abrasive, thereby extending the life of the tire mold 16 and improving the appearance of the tire produced by the tire mold. Additionally, the frozen CO2 e~oldtes on contact with the tire 3~ mold 16, producing a pres~ulized gas that cleans out the microvents of the tire mold. Also, since the CO2 pellets e~/~old~e on contact with the tire mold half 16, hou~el~eeping is improved because no blasting agents are deposited on the other equipment or on the floor..
Before cleaning, the segmented tire mold 16 need not be di~ssembled and is , . , . . ~
conveyed onto a rotary table 40 rotatable about the axis and controlled by a servomotor (not shown). The rotary table 40 rotates the tire mold 16 past a spray nozzle 52 of a robot 46.
The spray nozzle 52 is attached to the end of the robot 46. The robot 46 is multi-directional, preferably being a six axis robot, so that the spray nozzle 52 may be adjusted to clean an entire tire mold 16. The spray nozzle 52 is preferably adjusted by the robot 46 to aim a stream of frozen CO2 pellets in a direction normal to the surface of the tire mold 16 that is being cleaned. The speed at which the rotary table 40 rotates is adjustable as is the robot 46 positioning of the spray nozzle 52 to optimize the cleaning action of the cleaning apparatus 10. The rotational speed of the rotary table 40 and the position of the spray nozzle 52 at the end of the robot 46 are preferably regulated by a fully programmable robot controller 58. Also a safety shut off 72 is interposed between the spray nozzle ~2 and the robot to shut down the apparatus if the spray nozzle engages the mold 16 during the cleaning.
- Figure 2 shows a close-up view of the spray nozzle 52. The spray nozzle 52 is preferably curved slightly to enable the robot 46 to position the spray nozzle to clean a variety of different curved surfaces of the tire mold 16. The end of the spray nozzle 52 has a flow regulator 64 that regulates the flow of frozen CO2 pellets through the end of the spray nozzle. The flow regulator 64 may be closed completely to prohibit the flow of frozen CO2 pellets, or, as shown in Figure 3, the flow regulator may be opened up to a diameter 70 of 1.0 inch to increase the flow of frozen CO2 pellets.
Liquid nitrogen (Nz) may be injected into the air delivery system to super cool the frozen CO2 pellets to ensure that the pellets do not disintegrate or evaporate before they are delivered as a blasting agent.
With further reference to Figure 1, after the tire mold 16 is cleaned by the cleanin~
apparatus lO, a mold pusher 76 pushes the tire mold 16 off the rotary table 40 and onto an exit conveyor 82. The exit conveyor 82 conveys the tire mold 16 out of the enclosure 34 through a second opening 88 in the enclosure. The second opening 88 may have a door (not shown) which closes the opening when the cleaning a~ atus is in operation. The tire mold 16 is then transferred to a staging conveyor 94 where it awaits transport back into the tire production process. A tire mold 16 may be cleaned in approximately ten minutes using the cle~ning apparatus 10.
Figures 4-6 show a prefelled embodiment of the invention. The robotic CO2 cleaning apparatus 10 is preferably enclosed in a special enclosure 100 that has two doors 106,108. The doors 106,108 open to allow a tire mold 16 to be placed in the enclosure 100, and then the doors are closed before the robotic CO2 cleaning apparatus is activated. The doors 106,108 preferably have windows to allow an operator to see the tire mold 16 as it is cleaned.
s As shown in Figures 4 and 5, this p,ef~.led embodiment features two rotary tables 114,116 located on opposite sides of the robot 46. Each rotary table 114,116 has a centering apparatus that consists of preferably three radially movable centering guide members 122 that operate to center a tire mold 16 or mold half on each rotary table about.an axis of rotation of the table after the tire mold half is placed on each of the rotary tables by the hoist 28. As with the previous embodiment, each tire mold 16 to be cleaned is heated to approximately 350~F (177~C) to optimize the cleaning procedure.
Once centered, the rotary tables 114,116 rotate each tire mold 16 as the robot 46 positions the spray nozzle 52 normal to the mold surface of one of the tire molds to be cleaned, as illustrated in Figure 6. The spray nozzle 52 shown in solid lines illustrates the position of the spray nozzle for cleaning the sidewall surface 128 of the tire mold 16. The spray nozzle 52a shown in dotted lines shows the position of the spray nozzle for cleaning the tread surface 130 of the tire mold 16. The spray nozzle 52b shown in dotted lines shows the position of the spray nozzle for cleanin~ the bead surface 132 of the tire mold half 16.
The rotary tables 114,116 rotate each tire mold 16 about an axis of the tab}es past the spray nozzle 52 for a specified number of rotations to ensure thorough cleaning. The number of rotations may be controlled by a robot controller (not shown) programmed to meet mold cle.~nin~ specifications, or an operator may manually control the cleaning of a tire mold 16 by controlling the number of rotations of one of the rotary tables 114,116 or the positioning of the robot 46. In the preferred embodiment of the present invention, the rotary tables 114,116 rotate from 2 rpm to 4 rpm for ten revolutions to clean each of the tread surfaces 130, the sidewall surfaces 128, and the bead surfaces 132 of the tire mold halves 16. The number of revolutions and speed of rotation may be adjusted as necess~ry.
While the preferred embodiment has been described with two rotary tables 114,116, any number of rotary tables may be employed that will fit around and be in reach of the ~0 robot 46. Also the robot 46 may be mounted on a movable support to service additional molds.
The preferred embodiments have been described, hereinabove. It will be apparent to those skilled in the art that the above apparatus and methods may incorporate changes and ......
W O 98/07548 PCT~US96/13521 modifications without departing from the general scope of this invention. It is intended to include all such modifications and alterations in so far as they come within the scope of the appended claims or the equivalents thereof.
Having thus described the invention, it is now claimed:
Claims
Claims 1. An apparatus for cleaning a tire mold, said apparatus comprising:
a. source means for providing pellets:
b. propelling means for propelling said pellets against the surface to be cleaned.
characterized in that said pellets comprise frozen CO2 and a six axis robot for directing said pellets at desired locations on molding surfaces of said tire mold.
2. The apparatus of claim 1 further characterized by rotating means comprising a first positioning table, comprising a fist servo motor and a first control means for rotating said first positioning table.
3. The apparatus of claim 2 further characterized by said rotating means comprising a second positioning table having a second servo motor and a second control means for rotating said second positioning table.
4. The apparatus of claim 1 further characterized by:
a. a second-proof insulated enclosure for said tire mold:
b. a rotatable support for positioning and rotating said tire mold in said enclosure:
c. said robot in said enclosure having an arm movable to select cleaning positions over said surface:
d. a nozzle mounted on said arm and in communication with a source of said pellets:
e. a robot control means for rotating said arm to selected positions of said nozzle over said surface to direct said pellets over said surface: and, f. power means for rotating said rotatable support while said pellets are directed against said surface.
5. The apparatus of claim 4 wherein said nozzle is adjustable to direct said pellets against said surface in directions substantially perpendicular to said surface at different positions axially of said tire mold.
6. Apparatus in accordance with claim 5 further characterized by a second rotatable support for a second tire mold being located in said soundproof insulated enclosure adjacent said robot and at a position for said arm to move to said selected cleaning positions over a molding surface of a second tire mold.
7. Apparatus in accordance with claim 4 further characterized by said soundproof insulated enclosure having at least one movable door for closing and opening in said soundproof insulated enclosure and an overhead hoist extending from a position over said opening to a position spaced from said soundproof insulated enclosure for conveying said tire mold into and out of said soundproof insulated enclosure.
8. Apparatus in accordance with claim 7 further characterized by a second opening and a second movable door for said second opening, to provide for said tire mold entering said soundproof insulated enclosure through said first opening and exiting said soundproof insulated enclosure through said second opening.
13. A method of cleaning a tire mold, said method characterized by the step of:
directing pellets against a mold surface to be cleaned, wherein said pellets comprise a frozen gas.
14. The method of claim 13 further characterized by the step of:
rotating said mold.
15. The method of claim 14 further characterized by the step of:
moving a nozzle in an axial pattern so that an interior of said mold is cleaned.16. A method of claim 13 further characterized by the steps of:
supporting said tire mold on a rotatable support in a sound proof insulated enclosure for rotation about an axis of said support; and, communicating CO2 pellets to said molding surface from a pellet mixer by applying air pressure t a nozzle adjacent said molding surface and moving said nozzle axially of said support while rotating said tire mold on said support to traverse said molding surface.
17. The method of claim 16 wherein said nozzle is mounted on an arm of a robot in said sound-proof insulated enclosure, characterized by said arm being movable axially of said support.
18. The method of claim 17 characterized by a second molding surface of a second tire mold mounted on a second rotatable support in said sound-proof insulated enclosure wherein said second molding surface is cleaned by moving said arm of said robot to a position adjacent said second molding surface of said tire mold.
19. The method of claim 15 further characterized by said tire mold being heated to a temperature of about 350°F (177°C), said CO2 pellets being from .040 to 0.12 inches (0.10 to 0.30cm.) in diameter and at temperature of -80°F (-62°C), said rotatable support rotating from 2 rpm to 4 rpm for 10 revolutions to clean 3 sidewall surface 2 to 4 rpm for 10 revolutions to clean each bead surface and 2 to 4 rpm for 10 revolution to clean each tread surface.
a. source means for providing pellets:
b. propelling means for propelling said pellets against the surface to be cleaned.
characterized in that said pellets comprise frozen CO2 and a six axis robot for directing said pellets at desired locations on molding surfaces of said tire mold.
2. The apparatus of claim 1 further characterized by rotating means comprising a first positioning table, comprising a fist servo motor and a first control means for rotating said first positioning table.
3. The apparatus of claim 2 further characterized by said rotating means comprising a second positioning table having a second servo motor and a second control means for rotating said second positioning table.
4. The apparatus of claim 1 further characterized by:
a. a second-proof insulated enclosure for said tire mold:
b. a rotatable support for positioning and rotating said tire mold in said enclosure:
c. said robot in said enclosure having an arm movable to select cleaning positions over said surface:
d. a nozzle mounted on said arm and in communication with a source of said pellets:
e. a robot control means for rotating said arm to selected positions of said nozzle over said surface to direct said pellets over said surface: and, f. power means for rotating said rotatable support while said pellets are directed against said surface.
5. The apparatus of claim 4 wherein said nozzle is adjustable to direct said pellets against said surface in directions substantially perpendicular to said surface at different positions axially of said tire mold.
6. Apparatus in accordance with claim 5 further characterized by a second rotatable support for a second tire mold being located in said soundproof insulated enclosure adjacent said robot and at a position for said arm to move to said selected cleaning positions over a molding surface of a second tire mold.
7. Apparatus in accordance with claim 4 further characterized by said soundproof insulated enclosure having at least one movable door for closing and opening in said soundproof insulated enclosure and an overhead hoist extending from a position over said opening to a position spaced from said soundproof insulated enclosure for conveying said tire mold into and out of said soundproof insulated enclosure.
8. Apparatus in accordance with claim 7 further characterized by a second opening and a second movable door for said second opening, to provide for said tire mold entering said soundproof insulated enclosure through said first opening and exiting said soundproof insulated enclosure through said second opening.
13. A method of cleaning a tire mold, said method characterized by the step of:
directing pellets against a mold surface to be cleaned, wherein said pellets comprise a frozen gas.
14. The method of claim 13 further characterized by the step of:
rotating said mold.
15. The method of claim 14 further characterized by the step of:
moving a nozzle in an axial pattern so that an interior of said mold is cleaned.16. A method of claim 13 further characterized by the steps of:
supporting said tire mold on a rotatable support in a sound proof insulated enclosure for rotation about an axis of said support; and, communicating CO2 pellets to said molding surface from a pellet mixer by applying air pressure t a nozzle adjacent said molding surface and moving said nozzle axially of said support while rotating said tire mold on said support to traverse said molding surface.
17. The method of claim 16 wherein said nozzle is mounted on an arm of a robot in said sound-proof insulated enclosure, characterized by said arm being movable axially of said support.
18. The method of claim 17 characterized by a second molding surface of a second tire mold mounted on a second rotatable support in said sound-proof insulated enclosure wherein said second molding surface is cleaned by moving said arm of said robot to a position adjacent said second molding surface of said tire mold.
19. The method of claim 15 further characterized by said tire mold being heated to a temperature of about 350°F (177°C), said CO2 pellets being from .040 to 0.12 inches (0.10 to 0.30cm.) in diameter and at temperature of -80°F (-62°C), said rotatable support rotating from 2 rpm to 4 rpm for 10 revolutions to clean 3 sidewall surface 2 to 4 rpm for 10 revolutions to clean each bead surface and 2 to 4 rpm for 10 revolution to clean each tread surface.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US1996/013521 WO1998007548A1 (en) | 1996-08-22 | 1996-08-22 | Robotic co2 tire mold cleaning |
| WOPCT/US96/13521 | 1996-08-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2262688A1 true CA2262688A1 (en) | 1998-02-26 |
Family
ID=22255642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002262688A Abandoned CA2262688A1 (en) | 1996-08-22 | 1996-08-22 | Robotic co2 tire mold cleaning |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0921905A1 (en) |
| JP (1) | JP2000516861A (en) |
| AU (1) | AU6853496A (en) |
| BR (1) | BR9612734A (en) |
| CA (1) | CA2262688A1 (en) |
| WO (1) | WO1998007548A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107756261A (en) * | 2017-11-24 | 2018-03-06 | 无锡市日升机械厂 | Outside operated box precision component sand-blasting machine |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19830397A1 (en) * | 1998-07-08 | 2000-01-20 | Diw Instandhaltung Gmbh | Device and method for cleaning vulcanization molds |
| AU3482799A (en) * | 1999-04-08 | 2000-11-14 | Goodyear Tire And Rubber Company, The | Tire mold cleaning method and apparatus |
| US6368417B1 (en) * | 1999-04-08 | 2002-04-09 | The Goodyear Tire & Rubber Company | Tire mold cleaning method and apparatus |
| DE19936698C1 (en) * | 1999-08-04 | 2000-12-21 | Continental Ag | Dry ice blasting of tire molds is carried out by cleaning trolley carrying hood, adapter ring and jet blasting equipment on manipulator arm in fully enclosed configuration |
| DE19943005A1 (en) * | 1999-09-09 | 2001-05-23 | Heinrich Gruber | Process for cleaning the surface of a plastic object |
| JP4877757B2 (en) * | 2006-07-10 | 2012-02-15 | 株式会社ブリヂストン | Method and apparatus for cleaning tire vulcanization mold |
| JP5246731B2 (en) * | 2006-12-19 | 2013-07-24 | 株式会社ブリヂストン | Mold cleaning method and apparatus |
| DE202007008402U1 (en) * | 2007-06-12 | 2007-10-11 | Pro Helio Trockeneisservice Gmbh | Dry ice cleaning device |
| JP5515425B2 (en) * | 2009-05-27 | 2014-06-11 | 横浜ゴム株式会社 | Cleaning method for tire vulcanization mold |
| JP5589307B2 (en) * | 2009-05-27 | 2014-09-17 | 横浜ゴム株式会社 | Cleaning method for vulcanizing mold |
| US8506361B2 (en) * | 2011-08-25 | 2013-08-13 | General Electric Company | Fixture to facilitate sandblasting of a cylindrical object |
| FR2979846B1 (en) * | 2011-09-13 | 2014-09-05 | Air Liquide | DEVICE FOR PROJECTING DRY ICE, IN PARTICULAR CARBON ICE, AND NOZZLE FOR SUCH A DEVICE |
| JP2013173295A (en) * | 2012-02-27 | 2013-09-05 | Sekisui Kaseihin Sakura:Kk | Method of cleaning in-mold foam molding die |
| ES2550553A1 (en) * | 2014-05-09 | 2015-11-10 | Of Course Solutions, S.L. | Automated equipment for cleaning cured products (Machine-translation by Google Translate, not legally binding) |
| CN104354115B (en) * | 2014-11-28 | 2018-03-30 | 济南大学 | A kind of box-type workpieces wheel abrator of overhead moving feeding |
| CN104493728B (en) * | 2014-12-12 | 2016-11-30 | 苏州雅泛迪铝业有限公司 | Hub mold surface processing equipment |
| TR201415813A2 (en) | 2014-12-25 | 2016-07-21 | Lang Yuezer Otomotiv Yan San Ve Tic A S | Rubber curing mold cleaning robot. |
| HUE046381T2 (en) | 2014-12-25 | 2020-03-30 | Lang Yuzer Otomotiv Yan Sanayi Ve Ticaret Anonim Sirketi | Sidewall cleaning machine for tire curing mold |
| WO2016105305A1 (en) | 2014-12-25 | 2016-06-30 | Lang Yuzer Otomotiv Yan Sanayi Ve Ticaret Anonim Sirketi | Cleaning assembly and method for tire curing mould having adjustable insulation hood |
| WO2016105304A1 (en) | 2014-12-25 | 2016-06-30 | Lang Yuzer Otomotiv Yan Sanayi Ve Ticaret Anonim Sirketi | Transport mechanism for a cleaning system of a tyre mould |
| JP6501554B2 (en) * | 2015-02-18 | 2019-04-17 | 住友ゴム工業株式会社 | Vent hole cleaning jig, vent hole cleaning device and vent hole cleaning method |
| WO2019127061A1 (en) * | 2017-12-27 | 2019-07-04 | 山东豪迈机械科技股份有限公司 | Apparatus for cleaning a tire mold |
| CN114311518B (en) * | 2022-03-08 | 2022-05-27 | 长沙申大科技集团股份有限公司 | Automatic cleaning equipment for injection molding processing mold |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB929998A (en) * | 1959-12-16 | 1963-06-26 | Philips Electrical Ind Ltd | Improvements in or relating to cleaning moulds |
| US3702519A (en) * | 1971-07-12 | 1972-11-14 | Chemotronics International Inc | Method for the removal of unwanted portions of an article by spraying with high velocity dry ice particles |
| US3905155A (en) * | 1973-11-29 | 1975-09-16 | Midwest Machine Works Inc | Tire mold cleaning apparatus |
| JPS5524751A (en) * | 1978-08-10 | 1980-02-22 | Sumitomo Rubber Ind Ltd | Cleaning apparatus for metal mold for tire vulcanization |
| JPS60255405A (en) * | 1984-05-31 | 1985-12-17 | Bridgestone Corp | Washing apparatus for vulcanization mold |
| FR2590827B1 (en) * | 1985-11-29 | 1988-04-22 | Aerospatiale | AUTOMATIC SHOT BLASTING SYSTEM FOR GENERATING SURFACE PRESSURES AND ROBOT FOR AUTOMATION |
| EP0451383A1 (en) * | 1990-04-10 | 1991-10-16 | Sanyo Trading Co., Ltd. | Method for cleansing molds |
| US5364472A (en) * | 1993-07-21 | 1994-11-15 | At&T Bell Laboratories | Probemat cleaning system using CO2 pellets |
| US5651723A (en) * | 1994-04-13 | 1997-07-29 | Viratec Thin Films, Inc. | Method and apparatus for cleaning substrates in preparation for deposition of thin film coatings |
-
1996
- 1996-08-22 JP JP10510684A patent/JP2000516861A/en active Pending
- 1996-08-22 EP EP96928964A patent/EP0921905A1/en not_active Withdrawn
- 1996-08-22 CA CA002262688A patent/CA2262688A1/en not_active Abandoned
- 1996-08-22 BR BR9612734A patent/BR9612734A/en active Search and Examination
- 1996-08-22 AU AU68534/96A patent/AU6853496A/en not_active Abandoned
- 1996-08-22 WO PCT/US1996/013521 patent/WO1998007548A1/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107756261A (en) * | 2017-11-24 | 2018-03-06 | 无锡市日升机械厂 | Outside operated box precision component sand-blasting machine |
Also Published As
| Publication number | Publication date |
|---|---|
| AU6853496A (en) | 1998-03-06 |
| EP0921905A1 (en) | 1999-06-16 |
| WO1998007548A1 (en) | 1998-02-26 |
| JP2000516861A (en) | 2000-12-19 |
| BR9612734A (en) | 1999-08-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |