GB2360964A - Method of treating the edge of a sheet metal material such as a saw blade - Google Patents

Method of treating the edge of a sheet metal material such as a saw blade Download PDF

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Publication number
GB2360964A
GB2360964A GB0003695A GB0003695A GB2360964A GB 2360964 A GB2360964 A GB 2360964A GB 0003695 A GB0003695 A GB 0003695A GB 0003695 A GB0003695 A GB 0003695A GB 2360964 A GB2360964 A GB 2360964A
Authority
GB
United Kingdom
Prior art keywords
edge
sheet
grinding member
saw blade
treating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0003695A
Other versions
GB0003695D0 (en
Inventor
Anthony Ogden
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.)
DEAN SAWS Ltd
Original Assignee
DEAN SAWS Ltd
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 DEAN SAWS Ltd filed Critical DEAN SAWS Ltd
Priority to GB0003695A priority Critical patent/GB2360964A/en
Publication of GB0003695D0 publication Critical patent/GB0003695D0/en
Publication of GB2360964A publication Critical patent/GB2360964A/en
Withdrawn legal-status Critical Current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
    • B23D63/00—Dressing the tools of sawing machines or sawing devices for use in cutting any kind of material, e.g. in the manufacture of sawing tools
    • B23D63/08—Sharpening the cutting edges of saw teeth
    • B23D63/12—Sharpening the cutting edges of saw teeth by grinding
    • 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
    • B23D63/00—Dressing the tools of sawing machines or sawing devices for use in cutting any kind of material, e.g. in the manufacture of sawing tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B39/00—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor
    • B24B39/006—Peening and tools therefor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

A method of treating the edge of a sheet metal material such as a saw blade comprises abrading at least a part of the longitudinal edge of the sheet in a direction substantially parallel to the longitudinal direction of the edge. An apparatus for treating the edge may comprise a generally cylindrical rotatable grinding member. The grinding member may be mounted so that the axis of rotation is perpendicular to the longitudinal direction of the edge of the sheet material so that the edge is abraded by the peripheral edge of the grinding member. Compressive stresses may be generated in the surface of the sheet material by surface hardening procedures, such as nitriding, shot peening, or a mechanical deformation process.

Description

2360964 METHOD AND APPARATUS FOR TREATING THE EDGES OF SHEET METAL
MATERIALS This invention relates to a method and to an apparatus for treating the edges of sheet metal materials such as saw blades.
is Saw blades conventionally comprise an elongate member or circular member which is pressed or otherwi.se formed from sheet metal. Cutting teeth are arranged along or around an edge of the sheet metal member and are separated by gullets. It is well known that flexure and other stressing of the saw blade can lead to fatigue fractures which start at an edge of the blade, generally in the area of a gullet where the blade is less deep and is therefore more flexible, and propagate across the blade. Such fractures can lead to early failure of the saw blade which requires costly repair or replacement and can be dangerous for an operator of the blade.
It is known, for example from United States Patent No. 5 759 092, to sharpen the teeth of a saw with a grinding wheel which rotates about an axis generally perpendicular to the axis of rotation of the circular blade. That is, the axis of rotation of the grinding wheel extends generally in the circumferential direction of the blade. This enables the flat end surface of the grinding wheel to move in a direction transversely of the edge of the blade 2 material and to contact the edge of the blade material over substantially the entire end face of the grinding wheel which results in a relatively long useful life for the grinding wheel.
It is similarly known to use such grinding wheels to sharpen the teeth of elongate saw blades. In such cases the axis of rotation of the grinding wheel extends generally in the longitudinal direction of the elongate blade. once again, the flat end surface of the grinding wheel moves in a direction transverse to the edge of the blade and contacts the edge of the blade over substantially the entire end face of the grinding wheel.
A disadvantage of the movement of the grinding wheel transversely of the edge of the blade is that the abrasive material of the wheel scores the edge in a direction transversely of the blade edge. Such scores, which are also known as wheel strike or wheel burn, can readily provide deformities in the edge of the blade from which cracks can form and propagate. Moreover, should the periphery of the grinding wheel contact the gullet region of the blade as the blade is being sharpened then more serious damage is effected to the edge of the blade material, once again in a direction transverse to the blade, and furthermore such damage is specifically in a region of the blade which is relatively flexible and therefore relatively susceptible to stress damage.
- 3 It is therefore an object of the present invention to provide a method and an apparatus for treating the edges of sheet metal materials, including saw blades, in order to reduce the incidence of fractures.
According to a first aspect of the present invention there is provided a method f or treating the edge of a sheet metal material comprising abrading at least a part of the longitudinal extent of the edge of the sheet in a direction substantially parallel to the longitudinal direction of the edge.
It may not be essential to treat the entire length of the edge of the sheet, but only to treat those parts of the edge that are particularly susceptible to fractures. Thus, in the case of a saw it may only be essential to treat those parts of the saw, that is the regions of the gullets, that are most flexible and therefore most susceptible to fracture.
The method may be effected with an apparatus according to the second aspect of the invention.
The method may include the further step of generating compressive stresses in the surface of the material of the sheet. The compressive stresses may be generated by surface hardening procedures, such as nitriding and mechanical deformation processes, for example shot peening.
is According to a second aspect of the present invention there is provided an apparatus for treating the edge of a sheet metal material comprising a generally cylindrical grinding member rotatable about the axis thereof, the grinding member being mounted such that the axis is perpendicular to the longitudinal direction of the edge of the sheet whereby the edge of the sheet is in use abraded by the peripheral surface of the grinding member.
The grinding member may have an axial extent greater than the thickness of the sheet. In this way it is possible to ensure that the entire width of the edge is treated.
The grinding member may be movable relative to the sheet in the longitudinal direction of the edge to be treated.
The grinding member may be movable relative to the sheet so as to be movable towards and away from the edge in a direction substantially perpendicular to the axis of rotation of the grinding member.
The grinding member may be movable in the axial direction thereof. The speed of movement may be slow relative to the rotational speed of the grinding member.
The sheet may comprise a saw blade, for example an elongate saw blade, such as for a band saw, gang saw or frame saw, or a circular saw blade. The saw blade may be particularly adapted for sawing wood. In the case of a saw blade, the apparatus may be adapted such that only gullet regions of the saw blade are treated.
is For a better understanding of the present invention and to show more clearly how it may be carried into effect reference will now be made, by way of example, to the accompanying drawings in which:
Figure 1 is an end view of a sheet of metal material, the edge of which is being treated according to the present invention; and Figure 2 is a side view of a sheet of metal material, in the form of a saw blade, the edge of which is being treated according to the present invention.
The figures show a sheet 1 of metal material, for example a saw blade having teeth 3 separated by gullets 5.
The edge of the sheet 1 is being treated with a grinding member 7 which is rotatable by means of a motor 9 about an axis which extends transversely of the longitudinal direction of the edge of the sheet. The effect of treating the edge of the sheet 1 in such a manner is to eliminate defects in the edge of the sheet that extend transversely of the edge. Any defects introduced as a result of treatment with the grinding member 7 will extend substantially in the longitudinal direction of the edge.
is Thus, it is the peripheral surface of the grinding member which carries out the treatment and not the end face. To this end, the grinding member is generally cylindrical in form, although a degree of conical shape may be permitted. In order to ensure the entire edge of the sheet 1 is treated the grinding member 7 has an axial length greater than the thickness of the sheet 1. The diameter of the grinding member may be of any suitable dimension, but when treating saw blades and other sheets having profiled edges, the diameter should be sufficiently small to ensure the edge of the sheet can be fully treated especially in any gullet or other recessed regions which can be particularly susceptible to crack formation.
In order to treat part or all of the longitudinal extent of the edge, the grinding member 7 is movable relative to the sheet 1 in the longitudinal direction of the edge. For example, the grinding member may be mounted so as to be movable relative to the sheet, or the sheet may be mounted so as to be movable relative to the grinding member. Either way, the manner in which relative movement is achieved can be effected in a number of wellknown ways and involves no invention.
In order to follow any profile on the edge of the sheet 1, f or example as in the case of a saw blade, the grinding member 7 can be movable relative to the sheet 1 towards and away f rom the edge. Again, the grinding member may be mounted so as to be movable relative to the sheet, or the sheet may be mounted so as to be movable relative to the grinding member. Either way, the manner in which relative movement is achieved can be effected in a number of wellknown ways and involves no invention.
is In order to maximise the service lif e of the grinding member 7, the grinding member may be movable in the axial direction thereof relative to the sheet 1 to enable substantially the entire axial extent of the grinding member to be used. Once again, the grinding member may be mounted so as to be movable relative to the sheet, or the sheet may be mounted so as to be movable relative to the grinding member. Either way, the manner in which relative movement is achieved can be effected in a number of wellknown ways and involves no invention. In any event, axial movement of the grinding member 7 should be relatively slow compared with it's speed of rotation. In this way no defects are created that extend other than substantially in the longitudinal direction of the edge of the sheet.
It may not be essential to treat the entire length of the edge of the sheet, but only to treat those parts of the edge that are particularly susceptible to fatigue, or - 8 stress, fractures. Thus, in the case of a saw it -may only be essential to treat those parts of the saw, that is the regions of the gullets, that are most flexible and therefore most susceptible to fracture.
The sheet, especially the edge regions of the sheet, and most particularly those edge regions of the sheet that are most susceptible to fatigue fractures, may be subjected to further treatment in order to generate compressive stresses in the surface of the material of the sheet. Compressive stresses are generated by surface hardening procedures, which can be effected in a number of ways which are well known in themselves, including nitriding and mechanical deformation processes such as shot peening.
- 9

Claims (20)

1. A method for treating the edge of a sheet metal material comprising abrading at least a part of the longitudinal extent of the edge of the sheet in a direction substantially parallel to the longitudinal direction of the edge.
is
2. A method according to claim 1 and including the further step of generating compressive stresses in the surface of the material of the sheet.
3. A method according to claim 2, wherein the compressive stresses are generated by surface hardening procedures.
4. A method according to claim 3, wherein the surface hardening procedure comprises a nitriding process.
5. A method according to claim 3, wherein the surface hardening procedure comprises a mechanical deformation process.
6. A method according to claim 5, wherein the mechanical deformation process comprises shot peening.
7. A method for treating the edge of a sheet metal material substantially as hereinbefore described with reference to the accompanying drawings.
8. An apparatus for treating the edge of a sheet metal material comprising a generally cylindrical grinding member rotatable about the axis thereof, the grinding member being mounted such that the axis is perpendicular to the longitudinal direction of the edge of the sheet whereby the edge of the sheet is in use abraded by the peripheral surface of the grinding member.
is
9. An apparatus as claimed in claim 8, wherein the grinding member has an axial extent greater than the thickness of the sheet.
10. An apparatus as claimed in claim 8 or 9, wherein the grinding member is movable relative to the sheet in the longitudinal direction of the edge to be treated.
11. An apparatus as claimed in any one of claim 8 to 10, wherein the grinding member is movable relative to the sheet so as to be movable towards and away from the edge in a direction substantially perpendicular to the axis of rotation of the grinding member.
12. An apparatus as claimed in any one of claims 8 to 11, wherein the grinding member is movable in the axial direction thereof.
11
13. An apparatus as claimed in claim 12, wherein the speed of movement in the axial direction is slow relative to the rotational speed of the grinding member.
14. An apparatus as claimed in any one of claims 8 to 13, wherein the sheet comprises a saw blade.
15. An apparatus as claimed in claim 14, wherein the saw blade comprises an elongate saw blade.
is
16. An apparatus as claimed in claim 15, wherein saw blade is for a band saw, gang saw or frame saw.
17. An apparatus as claimed in claim 14, wherein the saw blade comprises a circular saw blade.
18. An apparatus as claimed in any one of claims 14 to 17, wherein the saw blade is particularly adapted for sawing wood.
19. An apparatus as claimed in any one of claims 14 to 18, wherein the apparatus is adapted such that only gullet regions of the saw blade are treated.
20. An apparatus for treating the edge of a sheet metal material substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
GB0003695A 2000-02-18 2000-02-18 Method of treating the edge of a sheet metal material such as a saw blade Withdrawn GB2360964A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0003695A GB2360964A (en) 2000-02-18 2000-02-18 Method of treating the edge of a sheet metal material such as a saw blade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0003695A GB2360964A (en) 2000-02-18 2000-02-18 Method of treating the edge of a sheet metal material such as a saw blade

Publications (2)

Publication Number Publication Date
GB0003695D0 GB0003695D0 (en) 2000-04-05
GB2360964A true GB2360964A (en) 2001-10-10

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GB0003695A Withdrawn GB2360964A (en) 2000-02-18 2000-02-18 Method of treating the edge of a sheet metal material such as a saw blade

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GB (1) GB2360964A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2559599A (en) * 2017-02-10 2018-08-15 Ernest Bennett & Company Darlington Ltd Improvement to saw blades

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB687708A (en) * 1951-06-15 1953-02-18 Rudolf Alber Junior Improvements in or relating to band saw sharpening machines
GB2153726A (en) * 1984-02-06 1985-08-29 Bosch Gmbh Robert Machine tool for trimming edges
GB2170739A (en) * 1985-02-07 1986-08-13 Atterton & Ellis Limited Grinding lawn mower bed knives
GB2185919A (en) * 1986-02-04 1987-08-05 Fiskars Ab Oy A device for sharpening knives
GB2261392A (en) * 1991-11-18 1993-05-19 Mobile Mfg Co Circular saw blade sharpener
GB2264246A (en) * 1992-02-13 1993-08-25 Bernhard Stephen G Grinding machine for cutting blades.
GB2278304A (en) * 1993-05-29 1994-11-30 David Thomas Seear Tool sharpening jig

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB687708A (en) * 1951-06-15 1953-02-18 Rudolf Alber Junior Improvements in or relating to band saw sharpening machines
GB2153726A (en) * 1984-02-06 1985-08-29 Bosch Gmbh Robert Machine tool for trimming edges
GB2170739A (en) * 1985-02-07 1986-08-13 Atterton & Ellis Limited Grinding lawn mower bed knives
GB2185919A (en) * 1986-02-04 1987-08-05 Fiskars Ab Oy A device for sharpening knives
GB2261392A (en) * 1991-11-18 1993-05-19 Mobile Mfg Co Circular saw blade sharpener
GB2264246A (en) * 1992-02-13 1993-08-25 Bernhard Stephen G Grinding machine for cutting blades.
GB2278304A (en) * 1993-05-29 1994-11-30 David Thomas Seear Tool sharpening jig

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2559599A (en) * 2017-02-10 2018-08-15 Ernest Bennett & Company Darlington Ltd Improvement to saw blades
GB2559599B (en) * 2017-02-10 2020-12-16 Ernest Bennett & Company Darlington Ltd Improvements to Saw Blades

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Publication number Publication date
GB0003695D0 (en) 2000-04-05

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