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WO2000023234A1 - Method for cooling a cutting blade when sawing concrete, and cutting blade - Google Patents

Method for cooling a cutting blade when sawing concrete, and cutting blade Download PDF

Info

Publication number
WO2000023234A1
WO2000023234A1 PCT/FI1999/000861 FI9900861W WO0023234A1 WO 2000023234 A1 WO2000023234 A1 WO 2000023234A1 FI 9900861 W FI9900861 W FI 9900861W WO 0023234 A1 WO0023234 A1 WO 0023234A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
cooling medium
sawing
blade body
cover
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.)
Ceased
Application number
PCT/FI1999/000861
Other languages
French (fr)
Inventor
Lassi Järvinen
Leo Sandqvist
Aimo Seppänen
Heikki Kankkunen
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.)
Addtek Research and Development Oy AB
Original Assignee
Addtek Research and Development Oy AB
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 Addtek Research and Development Oy AB filed Critical Addtek Research and Development Oy AB
Priority to AU64780/99A priority Critical patent/AU6478099A/en
Publication of WO2000023234A1 publication Critical patent/WO2000023234A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D59/00—Accessories specially designed for sawing machines or sawing devices
    • B23D59/02—Devices for lubricating or cooling circular saw blades
    • B23D59/025—Devices for lubricating or cooling circular saw blades the lubricating or cooling medium being applied through the mounting means of the tool, e.g. the tool spindle or hub
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D59/00—Accessories specially designed for sawing machines or sawing devices
    • B23D59/02—Devices for lubricating or cooling circular saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/02—Circular saw blades
    • B23D61/025—Details of saw blade body

Definitions

  • This invention concerns a method of cooling a rotary blade used in the sawing of concrete by leading a cooling medium to the blade and away from the blade.
  • the invention concerns also a rotary sawing blade for sawing concrete, which blade comprises a blade body and cutting bits attached to the periphery thereof and which is provided with a cover and with means of leading the cooling medium to the blade.
  • Concrete elements that have been cast using the slip-form method like hollow core concrete slabs, have to be removed from the one-piece casting by sawing to the right length after the casting and hardening.
  • the sawing is performed using a diamond-tipped rotary blade.
  • the rapidly rotating blade rubs against the mineral aggregate, it becomes very hot, as a result of which the diamond tips attached with silver solder come off the blade.
  • the quartz dust resulting from the sawing is a hazardous substance that should eliminated from the working environment.
  • the conventional way of cooling a rotary cutting blade is to use water. At the same time, the water binds the dust resulting from the sawing. Adequate cooling, however, requires a lot of water, about 20 to 30 1/min. As a result thereof, sawing slurry, which covers the floor and easily clogs the drains, is formed. Another disadvantage is the high noise level, about 105 to 110 decibels, caused by the rapidly rotating blade and necessitating the use of hearing protectors.
  • the characteristics of the method and the sawing blade according to the invention are set forth in claims 1 and 8.
  • the invention provides an effective cooling of a rapidly rotating cutting blade, wherein no water or only a small quantity of water is used.
  • the blade according to the invention can be made in such a way that its body does not form a unitary, closed surface, whereby the openings in the blade body affect its specific vibration frequency. Thus, the blade does not cause as much noise as a prior art blade.
  • FIG. 1 is a side view of the blade according to the invention
  • Figure 2 shows a section taken along line A - A of Figure 1
  • Figure 3 shows a detail of Figure 1 on a larger scale
  • Figure 4 shows a section of the centre of the blade and the channels therein.
  • the blade shown in Figure 1 rotates in a clockwise direction.
  • the blade body 1 according to the invention is composed of two plate-like, round parts 1 ' comprising openings 2 and having a gap between them.
  • diamond tips 3 are attached at regular intervals by soldering (Figure 3).
  • the openings 2 are curved in such a way that the concave side thereof runs ahead when the blade rotates.
  • the body plates are welded together around the periphery of openings 2.
  • the cover 4 comprises two opposite plates 4' and it covers the upper half of the blade. Inlet pipes 5 and an outlet pipe 6 are connected to the periphery of the cover for cooling air. A cover 7 that covers a part of the lower half of the blade is rotatably fixed to the shaft of the blade, under the upper cover 4.
  • a casing 8 is provided inside the cover 4, on each side of the blade body, for carbon dioxide 9.
  • an inlet channel 12 and an outlet channel 13 are shown for leading cooling water between the body plates 1 ' and away therefrom through the blade shaft.
  • cooling air is led to the blade body and between the body plates 1 ' through the inlet pipes 5 and through the gaps between the diamond tips 3, respectively. Dusty air is sucked away through the outlet pipe 6 by means of a suction device.
  • the wall 10 prevents the dusty air from going to the clean-air side.
  • dry ice which enhances the air-cooling as it evaporates, is fed into the cooling cushions 8.
  • liquid nitrogen can be led into the casings 8.
  • Water which is sucked away through the channel 13 of the shaft and which also serves to carry away sawing waste, is also led between the body plates 1 ' through the shaft 11 and the channel 12 thereof.
  • particularly large quantities of water are not required because it flows against the plates in the narrow gap between the plates and effectively conducts heat away from the plates.
  • a small quantity of water can be led into the saw-cut through the gaps between the diamond bits 3 in a controlled manner.
  • the cooling air does not escape from between the plates through the openings.
  • the curved walls 14 surrounding the openings between the body plates contribute, together with the centrifugal force, to the flow of cooling air toward the outer periphery of the blade and the tips 3, as well as toward the saw-cut.
  • the walls 14 guiding the airflow can extend a little outwards from the outer surfaces of the body plates 1'.
  • the openings of the body plates change the specific vibration frequency of the body. Therefore, the rotary blade body according to the invention, wherein an air gap is provided between the two plates, causes less noise than the prior art solid one-piece body.
  • the hazardous quartz dust resulting from the cutting can be sucked away together with the cooling air, through the suction pipe 6.
  • Humidified air can also be used as cooling air when necessary.
  • the air contains only a small quantity of sprayed water which, when it comes into contact with the hot blade, evaporates and thus binds the heat generated in the sawing, in which case no water flows onto the floor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

A method of cooling a rotary blade used in the sawing of concrete and a sawing blade. A cooling medium is led to the blade body (1), into the gap between the body and a cover (4) covering it, and away therefrom.

Description

METHOD FOR COOLING A CUTTING BLADE WHEN SAWING CONCRETE, AND CUTTING BLADE
This invention concerns a method of cooling a rotary blade used in the sawing of concrete by leading a cooling medium to the blade and away from the blade. The invention concerns also a rotary sawing blade for sawing concrete, which blade comprises a blade body and cutting bits attached to the periphery thereof and which is provided with a cover and with means of leading the cooling medium to the blade.
Concrete elements that have been cast using the slip-form method, like hollow core concrete slabs, have to be removed from the one-piece casting by sawing to the right length after the casting and hardening. The sawing is performed using a diamond-tipped rotary blade. When the rapidly rotating blade rubs against the mineral aggregate, it becomes very hot, as a result of which the diamond tips attached with silver solder come off the blade. Besides, the quartz dust resulting from the sawing is a hazardous substance that should eliminated from the working environment.
The conventional way of cooling a rotary cutting blade is to use water. At the same time, the water binds the dust resulting from the sawing. Adequate cooling, however, requires a lot of water, about 20 to 30 1/min. As a result thereof, sawing slurry, which covers the floor and easily clogs the drains, is formed. Another disadvantage is the high noise level, about 105 to 110 decibels, caused by the rapidly rotating blade and necessitating the use of hearing protectors.
Attempts have been made to solve the problem by sucking away slurry from the blade, from between the blade and the concrete element, which, however, is difficult. Dry saws have also been used, but in that case the cutting speed of the blade has to be kept low to prevent the blade from becoming too hot.
The characteristics of the method and the sawing blade according to the invention are set forth in claims 1 and 8. The invention provides an effective cooling of a rapidly rotating cutting blade, wherein no water or only a small quantity of water is used. The blade according to the invention can be made in such a way that its body does not form a unitary, closed surface, whereby the openings in the blade body affect its specific vibration frequency. Thus, the blade does not cause as much noise as a prior art blade.
The invention and the details thereof will be described in more detail with reference to the accompanying drawing wherein
Figure 1 is a side view of the blade according to the invention,
Figure 2 shows a section taken along line A - A of Figure 1,
Figure 3 shows a detail of Figure 1 on a larger scale, and
Figure 4 shows a section of the centre of the blade and the channels therein.
The blade shown in Figure 1 rotates in a clockwise direction. The blade body 1 according to the invention is composed of two plate-like, round parts 1 ' comprising openings 2 and having a gap between them. To the blade body, to the periphery thereof, between the plates 1 ', diamond tips 3 are attached at regular intervals by soldering (Figure 3). The openings 2 are curved in such a way that the concave side thereof runs ahead when the blade rotates. The body plates are welded together around the periphery of openings 2.
The cover 4 comprises two opposite plates 4' and it covers the upper half of the blade. Inlet pipes 5 and an outlet pipe 6 are connected to the periphery of the cover for cooling air. A cover 7 that covers a part of the lower half of the blade is rotatably fixed to the shaft of the blade, under the upper cover 4.
A casing 8 is provided inside the cover 4, on each side of the blade body, for carbon dioxide 9. A partition wall 10, which can be made of an elastic material, of rubber, for example, is provided between the outlet pipe 6 and the first inlet pipe 5, on the inside of the cover, on each side of the body. In Figure 4, an inlet channel 12 and an outlet channel 13 are shown for leading cooling water between the body plates 1 ' and away therefrom through the blade shaft.
When the blade according to the invention is used, cooling air is led to the blade body and between the body plates 1 ' through the inlet pipes 5 and through the gaps between the diamond tips 3, respectively. Dusty air is sucked away through the outlet pipe 6 by means of a suction device. The wall 10 prevents the dusty air from going to the clean-air side. In addition, dry ice, which enhances the air-cooling as it evaporates, is fed into the cooling cushions 8. Alternatively, liquid nitrogen can be led into the casings 8.
Water, which is sucked away through the channel 13 of the shaft and which also serves to carry away sawing waste, is also led between the body plates 1 ' through the shaft 11 and the channel 12 thereof. However, particularly large quantities of water are not required because it flows against the plates in the narrow gap between the plates and effectively conducts heat away from the plates. Besides, a small quantity of water can be led into the saw-cut through the gaps between the diamond bits 3 in a controlled manner.
As the body plates 1 ' are welded together around the openings 2, the cooling air does not escape from between the plates through the openings. The curved walls 14 surrounding the openings between the body plates contribute, together with the centrifugal force, to the flow of cooling air toward the outer periphery of the blade and the tips 3, as well as toward the saw-cut. In addition, the walls 14 guiding the airflow can extend a little outwards from the outer surfaces of the body plates 1'.
Furthermore, the openings of the body plates change the specific vibration frequency of the body. Therefore, the rotary blade body according to the invention, wherein an air gap is provided between the two plates, causes less noise than the prior art solid one-piece body.
The hazardous quartz dust resulting from the cutting can be sucked away together with the cooling air, through the suction pipe 6. Humidified air can also be used as cooling air when necessary. However, the air contains only a small quantity of sprayed water which, when it comes into contact with the hot blade, evaporates and thus binds the heat generated in the sawing, in which case no water flows onto the floor.

Claims

Claims
1. A method of cooling a rotary blade used in the sawing of concrete by leading a cooling medium to the blade and away from the blade, characterised in that the cooling medium is led to the blade body (1), into the gap between the body and a cover (4) covering it, and away therefrom.
2. A method as defined in claim 1, characterised in that the cooling medium is sucked away from the gap between the blade body (1) and the cover (4) by means of negative pressure.
3. A method as defined in claim 1 or 2, characterised in that the cooling medium is led into the gap between the two opposite plates (1 ') of the blade body (1).
4. A method as defined in any one of claims 1 to 3, characterised in that air is used as the cooling medium.
5. A method as defined in claim 4, characterised in that humidified air is used as the cooling medium.
6. A method as defined in any one of claims 1 to 5, characterised in that water, which is led, in a controlled way and only to a limited extent, into the saw-cut through the gaps between cutting bits (3) attached to the blade body, is used as the cooling medium.
7. A method as defined in any one of claims 1 to 6, characterised in that sawing waste is sucked away together with the cooling medium.
8. A method as defined in any one of claims 1 to 7, characterised in that the blade is cooled by means of dry ice (9) and/or by means of liquid nitrogen.
9. A rotary sawing blade for sawing concrete, which blade comprises a blade body (1) and cutting bits (3) attached to the periphery thereof and which is provided with a cover (4) and o with means (5) of leading a cooling medium to the blade, characterised in that the means (5) of leading a cooling medium are arranged in such a way that the medium can be led to the blade body (1), into the gap between the body and the cover (4) covering it, and away therefrom.
10. A rotary sawing blade as defined in claim 8, characterised in that the blade is provided with means (6) of sucking the cooling medium away from the gap between the blade body (1) and the cover (4).
11. A rotary sawing blade as defined in claim 9 or 10, characterised in that a partition wall (10) is provided between the blade body (1) and the cover (4), after the cooling medium outlet (6), before the cooling medium inlet (5).
12. A sawing blade as defined in any one of claims 9 to 11, characterised in that the blade body (1) is composed of two spaced-apart plates (1') and in that the means (5) of leading a cooling medium are arranged in such a way the cooling medium can be led into the gap between the plates of the blade body.
13. A sawing blade as defined in any one of claims 9 to 12, characterised in that the blade body (1) comprises openings (2).
14. A sawing blade as defined in any one of claims 9 to 13, characterised in that the blade body (1) comprises walls (14) aligned in such a way that they guide the cooling medium to the outer periphery of the blade.
15. A sawing blade as defined in claim 14, characterised in that the walls (14) are aligned in such a way that they guide the cooling medium into the saw-cut, through the gaps between the cutting bits (3).
PCT/FI1999/000861 1998-10-19 1999-10-19 Method for cooling a cutting blade when sawing concrete, and cutting blade Ceased WO2000023234A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU64780/99A AU6478099A (en) 1998-10-19 1999-10-19 Method for cooling a cutting blade when sawing concrete, and cutting blade

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI982257 1998-10-19
FI982257A FI107894B (en) 1998-10-19 1998-10-19 Procedure for cooling inserts used in sawing concrete and sawing inserts

Publications (1)

Publication Number Publication Date
WO2000023234A1 true WO2000023234A1 (en) 2000-04-27

Family

ID=8552733

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1999/000861 Ceased WO2000023234A1 (en) 1998-10-19 1999-10-19 Method for cooling a cutting blade when sawing concrete, and cutting blade

Country Status (3)

Country Link
AU (1) AU6478099A (en)
FI (1) FI107894B (en)
WO (1) WO2000023234A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013093191A1 (en) * 2011-12-20 2013-06-27 Elematic Oy Ab Method for the removal of dust generated in sawing, a saw blade, and a saw
FR3032461A1 (en) * 2015-02-09 2016-08-12 Ecl METHOD FOR DISENGAGING AN ANODICALLY USING A TANK FROM AN ALUMINUM PRODUCTION FACILITY
DE102016114871A1 (en) * 2016-08-11 2018-02-15 Lissmac Maschinenbau Gmbh Release sheet for processing a hard material and tool
WO2020223711A1 (en) * 2019-05-02 2020-11-05 The Regents Of The University Of California Passive cooling structure for cast saw blades

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE852638C (en) * 1950-06-29 1952-10-16 Adalbert Besta Cooling device for rapidly rotating circular saw blades
US3188010A (en) * 1963-05-08 1965-06-08 Lee F James Lubricator having valve, conduit and atomizer juncture means
US3572841A (en) * 1969-01-15 1971-03-30 Norton Co Material pickup for groove cutters
US4022182A (en) * 1976-01-12 1977-05-10 Lenkevich Steve T Dust and water confinement unit for portable circular saw
US4091580A (en) * 1977-06-29 1978-05-30 Timex Corporation Process for holding and cutting sheet glass
US4333371A (en) * 1979-03-07 1982-06-08 Tani Saw Mfg. Co., Ltd. Saw blades having coolant passages and apparatus for using the blades
US4998775A (en) * 1989-10-10 1991-03-12 Hollifield David L Apparatus for precision cutting of concrete surfaces
US5088241A (en) * 1989-04-01 1992-02-18 Mg Polishing device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE852638C (en) * 1950-06-29 1952-10-16 Adalbert Besta Cooling device for rapidly rotating circular saw blades
US3188010A (en) * 1963-05-08 1965-06-08 Lee F James Lubricator having valve, conduit and atomizer juncture means
US3572841A (en) * 1969-01-15 1971-03-30 Norton Co Material pickup for groove cutters
US4022182A (en) * 1976-01-12 1977-05-10 Lenkevich Steve T Dust and water confinement unit for portable circular saw
US4091580A (en) * 1977-06-29 1978-05-30 Timex Corporation Process for holding and cutting sheet glass
US4333371A (en) * 1979-03-07 1982-06-08 Tani Saw Mfg. Co., Ltd. Saw blades having coolant passages and apparatus for using the blades
US5088241A (en) * 1989-04-01 1992-02-18 Mg Polishing device
US4998775A (en) * 1989-10-10 1991-03-12 Hollifield David L Apparatus for precision cutting of concrete surfaces

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013093191A1 (en) * 2011-12-20 2013-06-27 Elematic Oy Ab Method for the removal of dust generated in sawing, a saw blade, and a saw
FR3032461A1 (en) * 2015-02-09 2016-08-12 Ecl METHOD FOR DISENGAGING AN ANODICALLY USING A TANK FROM AN ALUMINUM PRODUCTION FACILITY
WO2016128652A1 (en) * 2015-02-09 2016-08-18 Fives Ecl Method for detaching a spent anode assembly from a vessel of an aluminum production plant
DE102016114871A1 (en) * 2016-08-11 2018-02-15 Lissmac Maschinenbau Gmbh Release sheet for processing a hard material and tool
WO2020223711A1 (en) * 2019-05-02 2020-11-05 The Regents Of The University Of California Passive cooling structure for cast saw blades

Also Published As

Publication number Publication date
AU6478099A (en) 2000-05-08
FI982257A0 (en) 1998-10-19
FI107894B (en) 2001-10-31
FI982257L (en) 2000-04-20

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