EP1681137A1 - Grinding device and use of same grinding device for rectifying cylindrical items, apparatus and method for rectifying cylindrical items - Google Patents
Grinding device and use of same grinding device for rectifying cylindrical items, apparatus and method for rectifying cylindrical items Download PDFInfo
- Publication number
- EP1681137A1 EP1681137A1 EP04425960A EP04425960A EP1681137A1 EP 1681137 A1 EP1681137 A1 EP 1681137A1 EP 04425960 A EP04425960 A EP 04425960A EP 04425960 A EP04425960 A EP 04425960A EP 1681137 A1 EP1681137 A1 EP 1681137A1
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- EP
- European Patent Office
- Prior art keywords
- cylindrical
- grinding device
- abrasive bodies
- item
- abrasive
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
- B24D5/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
- B24D5/066—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental with segments mounted axially one against the other
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- 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
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
- B24B5/04—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally
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- 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
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/18—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centreless means for supporting, guiding, floating or rotating work
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- 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
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
- B24D5/10—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with cooling provisions, e.g. with radial slots
Definitions
- the present invention relates to a grinding device and to use of said device for grinding cylindrical items, in particular metallic items, preferably made of hard metal material.
- the invention also relates to an apparatus for grinding said cylindrical items, as well as to a method of grinding the items themselves.
- the present invention falls within the industrial field concerned with surface working of cylindrical items such as cylindrical tools to be subsequently used in high speed machine tools, and it is in particular directed to the sector in which high-accuracy machining operations are carried out by material removal, such as grinding, lapping, and/or similar surface-finish working operations on cylindrical metal items.
- grinding of cylindrical metal items like the above mentioned ones is generally carried out by means of grinding apparatus provided with suitable abrasive grinding devices capable of acting on a surface of the cylindrical item under working to remove a predetermined surface layer therefrom in order to reach a satisfactory finishing degree adapted for the cylindrical item itself.
- grinding apparatus normally used currently involve a working station at which a corresponding grinding device such as a grinding wheel suitably driven in rotation around a longitudinal axis thereof is brought into direct contact with the outer surface of the cylindrical item which too is movable in rotation around a respective longitudinal axis.
- a corresponding grinding device such as a grinding wheel suitably driven in rotation around a longitudinal axis thereof is brought into direct contact with the outer surface of the cylindrical item which too is movable in rotation around a respective longitudinal axis.
- the cylindrical item is axially translated relative to the grinding wheel in such a manner that the whole axial extension of the item itself is machined and the whole outer surface of said item is concerned.
- the grinding wheel currently used for machining cylindrical metal items consists of a cylindrical support core covered with an outer layer of abrasive material.
- the outer layer of abrasive material is subjected to wear as the grinding wheel is used during surface machining of the cylindrical items.
- the grinding wheel is readily replaced with another grinding wheel similar to the preceding one and unimpaired.
- cooling of the mutually-contacting parts of the rectifying device utilised and the cylindrical item under working can be optimised by increasing the efficiency of the cooling fluids used; at the same time too much waste of said fluids can be avoided, which use usually affects the overall production costs.
- Said aims are also achieved by a method of grinding cylindrical items in particular of hard metal material, comprising the features set out in claim 20.
- the grinding device 1 comprises at least one first substantially-cylindrical abrasive body 4 having at least one respective abrasive surface 4a set to act, under operating conditions, on a surface of the cylindrical item 2 to remove a predetermined surface layer therefrom. Still with reference to Figs.
- the grinding device 1 further comprises at least one second abrasive body 5, of substantially cylindrical shape as well, having a respective circumferential abrasive surface 5a set to act, under operating conditions, on a surface of the cylindrical body 2 under working, to cooperate with the first cylindrical abrasive body 4 in removing the predetermined surface layer of the cylindrical item 2.
- the grinding device 1 also comprises at least one intermediate element 6 interposed between the first and second cylindrical abrasive bodies 4, 5 to axially space out said bodies a predetermined amount ( ⁇ ) apart.
- each cylindrical abrasive body 4, 5 has a support core 4b, 4c that is substantially cylindrical and preferably made of high tensile steel, and at least one outer layer 4c, 5c for material removal, made of abrasive material, preferably diamond material, such as industrial diamond and/or powder metal alloys.
- the cylindrical support core 4b, 5b of each cylindrical abrasive body 4, 5, depending on the construction requirements of the grinding apparatus 3, can have a central through opening 4d, 5d axially expending in such a manner that engagement on a possible rotating shaft 7 of apparatus 3 is allowed.
- the outer layer 4c, 5c for material removal seen in cross section has a substantially ring- or crown-shaped conformation the outer peripheral region of which defines the abrasive circumferential surface 4a, 5a of the respective cylindrical abrasive body 4, 5, while the inner peripheral region gives rise to engagement of the outer removal layer 4c, 5c with the respective cylindrical support core 4b, 5b.
- the intermediate element 6, preferably of cylindrical conformation, has a smaller radial bulkiness than the maximum diameter of at least one of the provided cylindrical abrasive bodies 4, 5.
- the radial or diametrical bulkiness of the intermediate element 6 is smaller than the maximum diameter of the cylindrical support core 4b, 5b of the cylindrical abrasive bodies 4, 5 to such an extent that at least one undercut is defined, together with the respective cylindrical abrasive body 4, 5, also in a condition of full wear of the respective outer removal layer 4c, 5c.
- the radial or diametrical bulkiness of the intermediate element 6 is smaller than the maximum diameter of the support core 4b, 5b of all the cylindrical abrasive bodies 4, 5 forming the grinding wheel.
- the intermediate element 6 together with the cylindrical abrasive bodies 4, 5, defines at least one circumferential cooling groove 6a such set that, under operating conditions, it faces the cylindrical item 2 to enable at least one cooling fluid to act between the cylindrical abrasive bodies 4, 5, intermediate element 6 and cylindrical item 2, so as to suitably cool them.
- the grinding device 1 advantageously contemplates the presence of a plurality of cylindrical abrasive bodies 4, 5, 8 and a plurality of intermediate elements 6 aligned in coaxial relationship along a respective longitudinal common axis "X".
- the intermediate elements 6 are preferably alternated with the cylindrical abrasive bodies 4, 5, 8 to define a series of circumferential cooling grooves 6a such set that, under operating conditions, they face the cylindrical item under working.
- the size difference between the intermediate elements 6 and cylindrical abrasive bodies 4, 5, 8 gives the grinding device 1 an overall structure that, in longitudinal section, appears substantially indented. In this case each tooth is defined by the respective cylindrical abrasive body 4, 5, 8 while the space between adjacent teeth is defined by the circumferential cooling grooves 6a.
- the cylindrical abrasive bodies 4, 5, 8 are preferably identical and have the same axial and diametrical sizes. However, for particular applications or specific working operations on the cylindrical items 2, the cylindrical abrasive bodies 4, 5, 8 may also have different structural features. As shown in the accompanying figures, and for illustration convenience, the cylindrical abrasive bodies 8 too are provided with respective reference numerals 8a, 8b, 8c identifying the circumferential abrasive surfaces, cylindrical support cores and corresponding outer layers for material removal, respectively.
- the intermediate elements 6 too are substantially identical and consequently, together with the cylindrical abrasive bodies 4, 5, 8, they define a series of cooling grooves 6a that are substantially identical with each other.
- the cylindrical bodies 4, 5, 8 and corresponding intermediate elements 6 are rigidly engaged to define a single structure 9 in the form of rings.
- the cylindrical abrasive bodies 4, 5, 8 and intermediate elements 6 are movable in rotation integral with each other, around the common longitudinal axis "X" and they all rotate at the same angular speed and in the same rotation direction.
- the ring structure 9 of the grinding device 1 can also be made in a different manner; it may for example consist of a single monobloc covered with an outer layer for material removal, provided with a series of grooves for passage of the cooling fluid.
- a structure like the previously described one is preferred, due to the great number of advantages it offers, such as possibility of assembling and disassembling the grinding device 1 depending on the features of the cylindrical item 2 under working, use of the components presently on the market without necessarily being obliged to fully plan and make an article of this kind, and also interchangeability of the different elements based both on production requirements and/or on wear of some parts.
- the grinding device 1 is mounted on said grinding apparatus 3 at a working station 10 of said apparatus suitably equipped with adapted supports for movably carrying both the grinding device 1 in use and the cylindrical item 2 to be ground and also equipped with suitable movement means to drive the grinding device 1 in rotation around the longitudinal axis "X" thereof and the cylindrical item 2 around a longitudinal axis "Y" thereof.
- the movement means is further able to relatively move the grinding device 1 and cylindrical item 2 between an operating condition at which the grinding device 1 acts on the surface of the cylindrical item 2, and a non-operating condition at which they keep substantially spaced apart, i.e. do not come into mutual contact.
- the apparatus further comprises, in the working station 10, suitable cooling means 11 capable of delivering the above mentioned cooling fluid.
- the cooling fluid is preferably directly delivered onto the overheated parts by externally impinging on the latter and penetrating between the same by means of the circumferential cooling grooves 6a of the grinding device 1.
- Also advantageously provided by the present invention is a method of grinding the above mentioned cylindrical item 2.
- the first and second cylindrical abrasive bodies 4, 5 are consequently axially spaced out.
- the same operation is also carried out, by turns, on the other cylindrical abrasive bodies 8 and the other intermediate elements 6 that will be necessary to constitute the grinding device 1.
- Union of the cylindrical abrasive bodies 4, 5, 8 and the intermediate elements 6 is preferably carried out in such a manner that all components are rigidly fastened to each other.
- the grinding device 1 is mounted on apparatus 3 at the working station 10 of the latter and subsequently driven in rotation about its longitudinal axis "X". Simultaneously or subsequently, the cylindrical item 2 too is located in the working station 10 of apparatus 3 to be driven in rotation around its longitudinal axis "Y”.
- the grinding device 1 is finally disposed in the operating condition and subsequently axially translated relative to the cylindrical item 2 at a predetermined advancing speed capable of ensuring full grinding of the cylindrical surface of the cylindrical item itself.
- the invention achieves important advantages.
- the ring structure 9 of the grinding device enables an excellent finishing of the cylindrical surface of the cylindrical items under working, thereby achieving a high quality degree, higher than when grinding is carried out by use of a classic grinding wheel.
- Sharpness of the grinding wheel being the object of the invention is greater than in known devices, so that high production rates are allowed.
- one presence of a plurality of circumferential cooling seats enables a greater heat exchange between the cooling fluid supplied during working and the elements that are subject to strong temperature rises, such as the grinding device itself and the cylindrical item under working.
- the cooling fluid can penetrate into the circumferential cooling seats partly surrounding the cylindrical item under working and operating on a wider surface of the grinding device.
- cooling optimisation allows an important amount of the delivered cooling fluid to be saved, which will result in a reduction in the overall production costs as far as grinding of cylindrical items is concerned.
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Abstract
Description
- The present invention relates to a grinding device and to use of said device for grinding cylindrical items, in particular metallic items, preferably made of hard metal material.
- The invention also relates to an apparatus for grinding said cylindrical items, as well as to a method of grinding the items themselves.
- The present invention falls within the industrial field concerned with surface working of cylindrical items such as cylindrical tools to be subsequently used in high speed machine tools, and it is in particular directed to the sector in which high-accuracy machining operations are carried out by material removal, such as grinding, lapping, and/or similar surface-finish working operations on cylindrical metal items.
- It is known that grinding of cylindrical metal items like the above mentioned ones is generally carried out by means of grinding apparatus provided with suitable abrasive grinding devices capable of acting on a surface of the cylindrical item under working to remove a predetermined surface layer therefrom in order to reach a satisfactory finishing degree adapted for the cylindrical item itself.
- In more detail, grinding apparatus normally used currently involve a working station at which a corresponding grinding device such as a grinding wheel suitably driven in rotation around a longitudinal axis thereof is brought into direct contact with the outer surface of the cylindrical item which too is movable in rotation around a respective longitudinal axis.
- During working, the cylindrical item is axially translated relative to the grinding wheel in such a manner that the whole axial extension of the item itself is machined and the whole outer surface of said item is concerned.
- In detail, the grinding wheel currently used for machining cylindrical metal items consists of a cylindrical support core covered with an outer layer of abrasive material. The outer layer of abrasive material is subjected to wear as the grinding wheel is used during surface machining of the cylindrical items. When the abrasive outer layer is worn out, the grinding wheel is readily replaced with another grinding wheel similar to the preceding one and unimpaired.
- Obviously, due to the high angular speed to which both the grinding wheel and the cylindrical item under working are submitted and due to the persistent and prolonged friction between them, as required for achieving an optimal grinding quality, the grinding wheel and cylindrical item are subjected to too much heating. This tendency is however counteracted by a continuous supply of one or more cooling fluids constantly impinging on the parts in direct contact thereby maintaining them to a temperature suitable for the working operation being carried out.
- While present grinding apparatus and devices enable surface finishing of cylindrical items with satisfactory qualitative results, the Applicant has found that the known art has some drawbacks and can be further improved under different points of view. In particular, the Applicant has found that the quality and finishing degree of the cylindrical items under working can be greatly improved by an excellent grinding of the outer surface of said workpieces.
- In addition, it has been also found that cooling of the mutually-contacting parts of the rectifying device utilised and the cylindrical item under working can be optimised by increasing the efficiency of the cooling fluids used; at the same time too much waste of said fluids can be avoided, which use usually affects the overall production costs.
- It is a main aim of the present invention to solve the problems found in the known art by proposing a high-quality grinding operation. It is a further aim of the invention to make available a grinding wheel that has an optimal sharpness (thus increasing the production rates) and does not give rise to overheating problems in the regions under working, while at the same time enabling optimisation of the cooling fluids and reduction of waste.
- The foregoing and further aims that will become more apparent in the course of the following description are substantially achieved by a grinding device for cylindrical items, in particular of hard metal material, comprising the features set out in
claim 1. - Said aims are also achieved through use of the above device for grinding cylindrical items, in particular of hard metal material, comprising the features set out in
claim 10. - The intended aims are also achieved by an apparatus for grinding cylindrical items, in particular of hard metal material, comprising the features set out in
claim 11. - Said aims are also achieved by a method of grinding cylindrical items in particular of hard metal material, comprising the features set out in claim 20.
- Further features and advantages will become more apparent from the detailed description of a preferred but not exclusive embodiment relating to a grinding device, use of such a grinding device, a grinding apparatus and a method of grinding a cylindrical item, in particular of hard metal material, in accordance with the present invention. This description will be set out hereinafter with reference to the accompanying drawings given by way of non-limiting example, in which:
- Fig. 1 diagrammatically shows a grinding device in accordance with the invention;
- Fig. 2 shows the device in Fig. 1 seen in section; and
- Fig. 3 diagrammatically shows a machine for grinding cylindrical items.
- With reference to the drawings, generally denoted at 1 is a grinding device for
cylindrical items 2 in particular made of metal and preferably hard metal material, such as cylindrical tools designed for use in high-speed machine tools and other similar apparatus. In particular, as shown in Figs. 1 and 2, thegrinding device 1 comprises at least one first substantially-cylindricalabrasive body 4 having at least one respectiveabrasive surface 4a set to act, under operating conditions, on a surface of thecylindrical item 2 to remove a predetermined surface layer therefrom. Still with reference to Figs. 1 and 2, thegrinding device 1 further comprises at least one secondabrasive body 5, of substantially cylindrical shape as well, having a respective circumferentialabrasive surface 5a set to act, under operating conditions, on a surface of thecylindrical body 2 under working, to cooperate with the first cylindricalabrasive body 4 in removing the predetermined surface layer of thecylindrical item 2. Advantageously, thegrinding device 1 also comprises at least oneintermediate element 6 interposed between the first and second cylindricalabrasive bodies - In detail, each cylindrical
abrasive body support core outer layer 4c, 5c for material removal, made of abrasive material, preferably diamond material, such as industrial diamond and/or powder metal alloys. Thecylindrical support core abrasive body grinding apparatus 3, can have a central through opening 4d, 5d axially expending in such a manner that engagement on a possible rotatingshaft 7 ofapparatus 3 is allowed. Theouter layer 4c, 5c for material removal, seen in cross section has a substantially ring- or crown-shaped conformation the outer peripheral region of which defines the abrasivecircumferential surface abrasive body outer removal layer 4c, 5c with the respectivecylindrical support core - As shown in Figs. 1 and 2, the
intermediate element 6, preferably of cylindrical conformation, has a smaller radial bulkiness than the maximum diameter of at least one of the provided cylindricalabrasive bodies intermediate element 6 is smaller than the maximum diameter of thecylindrical support core abrasive bodies abrasive body outer removal layer 4c, 5c. Preferably, the radial or diametrical bulkiness of theintermediate element 6 is smaller than the maximum diameter of thesupport core abrasive bodies intermediate element 6 together with the cylindricalabrasive bodies circumferential cooling groove 6a such set that, under operating conditions, it faces thecylindrical item 2 to enable at least one cooling fluid to act between the cylindricalabrasive bodies intermediate element 6 andcylindrical item 2, so as to suitably cool them. - In the embodiment shown in Figs. 1 and 2, the
grinding device 1 advantageously contemplates the presence of a plurality of cylindricalabrasive bodies intermediate elements 6 aligned in coaxial relationship along a respective longitudinal common axis "X". Theintermediate elements 6 are preferably alternated with the cylindricalabrasive bodies circumferential cooling grooves 6a such set that, under operating conditions, they face the cylindrical item under working. The size difference between theintermediate elements 6 and cylindricalabrasive bodies grinding device 1 an overall structure that, in longitudinal section, appears substantially indented. In this case each tooth is defined by the respective cylindricalabrasive body circumferential cooling grooves 6a. - Still with reference to Figs. 1 and 2, the cylindrical
abrasive bodies cylindrical items 2, the cylindricalabrasive bodies abrasive bodies 8 too are provided withrespective reference numerals - Preferably, the
intermediate elements 6 too are substantially identical and consequently, together with the cylindricalabrasive bodies cooling grooves 6a that are substantially identical with each other. - Advantageously, the
cylindrical bodies intermediate elements 6 are rigidly engaged to define asingle structure 9 in the form of rings. In other words, the cylindricalabrasive bodies intermediate elements 6 are movable in rotation integral with each other, around the common longitudinal axis "X" and they all rotate at the same angular speed and in the same rotation direction. - The
ring structure 9 of thegrinding device 1 can also be made in a different manner; it may for example consist of a single monobloc covered with an outer layer for material removal, provided with a series of grooves for passage of the cooling fluid. Obviously, a structure like the previously described one is preferred, due to the great number of advantages it offers, such as possibility of assembling and disassembling thegrinding device 1 depending on the features of thecylindrical item 2 under working, use of the components presently on the market without necessarily being obliged to fully plan and make an article of this kind, and also interchangeability of the different elements based both on production requirements and/or on wear of some parts. - As shown in Fig. 3, the
grinding device 1 is mounted on saidgrinding apparatus 3 at aworking station 10 of said apparatus suitably equipped with adapted supports for movably carrying both thegrinding device 1 in use and thecylindrical item 2 to be ground and also equipped with suitable movement means to drive thegrinding device 1 in rotation around the longitudinal axis "X" thereof and thecylindrical item 2 around a longitudinal axis "Y" thereof. The movement means is further able to relatively move thegrinding device 1 andcylindrical item 2 between an operating condition at which thegrinding device 1 acts on the surface of thecylindrical item 2, and a non-operating condition at which they keep substantially spaced apart, i.e. do not come into mutual contact. - In order to counteract temperature rising both in the
grinding device 1 and in thecylindrical item 2, the apparatus further comprises, in theworking station 10, suitable cooling means 11 capable of delivering the above mentioned cooling fluid. The cooling fluid is preferably directly delivered onto the overheated parts by externally impinging on the latter and penetrating between the same by means of thecircumferential cooling grooves 6a of thegrinding device 1. - Also advantageously provided by the present invention is a method of grinding the above mentioned
cylindrical item 2. - First of all, it is necessary to assemble and form the
grinding device 1 so that it may be subsequently mounted on therespective apparatus 3 for grinding ofcylindrical items 2. Assembling of thegrinding device 1 takes place by arranging at least the first and second cylindricalabrasive bodies intermediate element 6. - The first and second cylindrical
abrasive bodies abrasive bodies 8 and the otherintermediate elements 6 that will be necessary to constitute thegrinding device 1. Union of the cylindricalabrasive bodies intermediate elements 6 is preferably carried out in such a manner that all components are rigidly fastened to each other. - At this point the
grinding device 1 is mounted onapparatus 3 at theworking station 10 of the latter and subsequently driven in rotation about its longitudinal axis "X". Simultaneously or subsequently, thecylindrical item 2 too is located in theworking station 10 ofapparatus 3 to be driven in rotation around its longitudinal axis "Y". - The
grinding device 1 is finally disposed in the operating condition and subsequently axially translated relative to thecylindrical item 2 at a predetermined advancing speed capable of ensuring full grinding of the cylindrical surface of the cylindrical item itself. - The invention achieves important advantages.
- First of all, the
ring structure 9 of the grinding device enables an excellent finishing of the cylindrical surface of the cylindrical items under working, thereby achieving a high quality degree, higher than when grinding is carried out by use of a classic grinding wheel. - Sharpness of the grinding wheel being the object of the invention is greater than in known devices, so that high production rates are allowed.
- It is also to be added that one presence of a plurality of circumferential cooling seats enables a greater heat exchange between the cooling fluid supplied during working and the elements that are subject to strong temperature rises, such as the grinding device itself and the cylindrical item under working. In particular, the cooling fluid can penetrate into the circumferential cooling seats partly surrounding the cylindrical item under working and operating on a wider surface of the grinding device.
- It will be also recognised that cooling optimisation allows an important amount of the delivered cooling fluid to be saved, which will result in a reduction in the overall production costs as far as grinding of cylindrical items is concerned.
Claims (20)
- A grinding device (1) for cylindrical items (2), in particular for grinding apparatus (3), said grinding device (1) being characterised in that it comprises:- at least one first and one second cylindrical abrasive bodies (4, 5) having respective circumferential abrasive surfaces (4a, 5a) set to act, under operating conditions, on a surface of a cylindrical item (2) driven in rotation about a longitudinal axis ("X") thereof;- at least one intermediate element (6) interposed between said first and second cylindrical abrasive bodies (4, 5), said intermediate element (6) axially spacing apart said circumferential abrasive surfaces (4a, 5a) of said cylindrical abrasive bodies (4, 5).
- A grinding device as claimed in claim 1,
characterised in that said intermediate element (6) has a maximum radial bulkiness smaller than said maximum diameter of at least one of said cylindrical abrasive bodies (4, 5). - A grinding device as claimed in claim 1 or 2,
characterised in that each cylindrical abrasive body (4, 5) comprises a substantially cylindrical support core (4b, 5b) and at least one outer layer (4c, 5c) for material removal, made of abrasive material and engaged on said cylindrical core (4b, 5b), said intermediate element (6) having a maximum radial bulkiness smaller than, or at most as large as, the maximum diameter of the cylindrical support core (4b, 5b) of at least one of said cylindrical abrasive portions (4, 5). - A grinding device as claimed in one or more of claims 1 to 3, characterised in that said intermediate element (6) is substantially cylindrical and has a smaller diameter than the cylindrical support core (4b, 5b) of at least one of said cylindrical abrasive bodies (4, 5).
- A grinding device as claimed in claim 4,
characterised in that said intermediate element (6) defines, together with said cylindrical abrasive bodies (4, 5), at least one circumferential cooling groove (6a) that, under operating conditions, is set to face said cylindrical item (2), said cooling groove (6a) allowing at least one cooling fluid to act between said cylindrical abrasive bodies (4, 5), intermediate element (6) and cylindrical item (2). - A grinding device as claimed in anyone of the preceding claims, characterised in that it comprises a plurality of cylindrical abrasive bodies (4, 5, 8) and a plurality of intermediate elements (6) aligned along a respective common longitudinal axis ("X"), the intermediate elements (6) being alternated with the cylindrical abrasive bodies (4, 5, 8) to define a series of circumferential cooling grooves (6a) that, under operating conditions, are set to face said cylindrical item (4, 5, 8).
- A grinding device as claimed in anyone of the preceding claims, characterised in that said cylindrical abrasive bodies (4, 5, 8) are substantially identical.
- A grinding device as claimed in claim 7 when depending on claim 6, characterised in that said intermediate elements (6) are substantially identical, said intermediate elements (6) and cylindrical abrasive bodies (4, 5, 8) defining circumferential cooling grooves (6a) that are substantially identical with each other.
- A grinding device as claimed in anyone of claims 6 to 8, characterised in that said cylindrical abrasive bodies (4, 5, 8) and corresponding intermediate element (6) are rigidly engaged to define a single structure (9), said cylindrical abrasive bodies (4, 5) and intermediate element (6) being drivable in rotation integral with each other, around the common longitudinal axis ("X").
- Use of a grinding device as claimed in one or more of the preceding claims, for grinding a cylindrical item (2), in particular of hard metal material.
- An apparatus for grinding cylindrical items (2), in particular of hard metal material, said apparatus (3) comprising:- at least one work station (10) set to receive at least one cylindrical article (2) to be ground, said cylindrical item (2) being movable in rotation around a longitudinal axis ("Y") thereof;- at least one grinding device (1) operatively associated with said work station (10), said grinding device being drivable in rotation about a longitudinal axis ("X") thereof and engaging said cylindrical item (2) at least partly, to remove at least one predetermined surface layer of said item;- cooling means (11) operatively associated with said work station (10) to cool said grinding device (1) and cylindrical item (4, 5), said cooling means (11) delivering at least one cooling fluid onto said grinding device (1) and cylindrical item (2),characterised in that said grinding device (1) comprises:- at least one first and one second cylindrical abrasive bodies (4, 5) having respective circumferential abrasive surfaces (4a, 5a) set to act, under operating conditions, on a surface of said cylindrical item (2);- at least one intermediate element (6) interposed between said first and second cylindrical abrasive bodies (4, 5), said intermediate element (6) axially spacing apart said circumferential abrasive surfaces (4a, 5a) of said cylindrical abrasive bodies (4, 5).
- An apparatus as claimed in claim 11, characterised in that said intermediate element (6) has a maximum radial bulkiness smaller than the maximum diameter of at least one of said cylindrical abrasive bodies (4, 5).
- An apparatus as claimed in claim 10 or 11,
characterised in that each cylindrical abrasive body (4, 5) comprises a substantially cylindrical support core (4b, 5b) and at least one outer layer (4c, 5c) for material removal, made of abrasive material and engaged on said cylindrical support core (4b, 5b), said intermediate element (6) having a maximum radial bulkiness smaller than the maximum diameter of the cylindrical support core (4b, 5b) of at least one of said cylindrical abrasive bodies (4, 5). - An apparatus as claimed in claim 13, characterised in that the intermediate element (6) is substantially cylindrical and has a maximum diameter smaller than the maximum diameter of the support core (4, 5) of at least one of said abrasive bodies (4, 5).
- An apparatus as claimed in anyone of claims 10 to 14, characterised in that said intermediate element (6) defines, together with said cylindrical abrasive bodies (4, 5), at least one circumferential cooling groove (6a) that, under operating conditions, is set to face said cylindrical item (2), said cooling fluid penetrating into the circumferential cooling groove (6a) between said cylindrical abrasive bodies (4, 5), intermediate element (6) and cylindrical item (2).
- An apparatus as claimed in one or more of the preceding claims, characterised in that said grinding device (1) comprises a plurality of cylindrical abrasive bodies (4, 5, 8) and a plurality of intermediate elements (6) aligned along a common longitudinal axis ("X") of said grinding device (1), the intermediate elements (6) being alternated with the cylindrical abrasive bodies (4, 5, 8) to define a series of circumferential cooling grooves (6a) that, under operating conditions, are set to face said cylindrical item (2).
- An apparatus as claimed in one or more of the preceding claims, characterised in that said cylindrical abrasive bodies (4, 5, 8) are substantially identical.
- An apparatus as claimed in claim 17 when depending on claim 16, characterised in that said intermediate elements (6) are substantially identical, said intermediate elements (6) and cylindrical abrasive bodies (4, 5, 8) defining cooling grooves that are substantially identical with each other.
- A device as claimed in anyone of claims 16 to 18,
characterised in that said cylindrical abrasive bodies (4, 5, 8) and corresponding intermediate element (6) are rigidly engaged to define a single structure (9), said cylindrical abrasive bodies (4, 5, 8) and intermediate element (6) being drivable in rotation integral with each other, around the common longitudinal axis ("X"). - A method of grinding a cylindrical item, in particular of hard metal material, comprising:- driving at least one cylindrical item (2) in rotation around a longitudinal axis ("Y") thereof;- driving a grinding device (1) in rotation around a longitudinal axis thereof ("X");- positioning said grinding device (1) relative to said cylindrical item (2) to a position suitable for grinding;- axially translating said grinding device (1) and cylindrical item (2) at a predetermined advancing speed capable of ensuring full grinding of the cylindrical surface of the cylindrical item (2),characterised in that said method, prior to the steps of driving the cylindrical item (2) and grinding device(1) in rotation, further comprises a step of forming the grinding device (1), comprising:- setting at least one first and one second cylindrical abrasive bodies (4, 5) to predetermined positions;- spacing apart said first and second cylindrical abrasive bodies (4, 5) through interposition of at least one intermediate element (6), said spacing causing axial moving apart of respective circumferential abrasive surfaces (4a, 5a) of said first and second cylindrical bodies (4, 5).
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT04425960T ATE360503T1 (en) | 2004-12-30 | 2004-12-30 | GRINDING DEVICE, ITS APPLICATION FOR GRINDING CYLINDRICAL OBJECTS, DEVICE AND METHOD FOR GRINDING CYLINDRICAL OBJECTS |
EP04425960A EP1681137B2 (en) | 2004-12-30 | 2004-12-30 | Grinding device and use of same grinding device for rectifying cylindrical items, apparatus and method for rectifying cylindrical items |
SI200430354T SI1681137T2 (en) | 2004-12-30 | 2004-12-30 | Grinding device and use of same grinding device for rectifying cylindrical items, apparatus and method for rectifying cylindrical items |
DE602004006149T DE602004006149T3 (en) | 2004-12-30 | 2004-12-30 | Grinder, its use for grinding cylindrical objects, apparatus and method for grinding cylindrical objects |
ES04425960T ES2286587T5 (en) | 2004-12-30 | 2004-12-30 | RECTIFICATION DEVICE AND USE OF SUCH RECTIFICATION DEVICE FOR RECTIFICATION OF CYLINDER ITEMS, APPLIANCE AND PROCEDURE FOR RECTIFICATION OF CYLINDRICAL ITEMS. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04425960A EP1681137B2 (en) | 2004-12-30 | 2004-12-30 | Grinding device and use of same grinding device for rectifying cylindrical items, apparatus and method for rectifying cylindrical items |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1681137A1 true EP1681137A1 (en) | 2006-07-19 |
EP1681137B1 EP1681137B1 (en) | 2007-04-25 |
EP1681137B2 EP1681137B2 (en) | 2010-11-10 |
Family
ID=34932968
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04425960A Not-in-force EP1681137B2 (en) | 2004-12-30 | 2004-12-30 | Grinding device and use of same grinding device for rectifying cylindrical items, apparatus and method for rectifying cylindrical items |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1681137B2 (en) |
AT (1) | ATE360503T1 (en) |
DE (1) | DE602004006149T3 (en) |
ES (1) | ES2286587T5 (en) |
SI (1) | SI1681137T2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITPD20090280A1 (en) * | 2009-09-25 | 2011-03-26 | Adi S P A | ABRASIVE DISC FOR MULTI-DISC WHEEL, PARTICULARLY FOR PROCESSING OF STONE MATERIALS AND RELATED MOLA AND INCLUDING THE WHEEL |
JP2014050908A (en) * | 2012-09-06 | 2014-03-20 | Ngk Spark Plug Co Ltd | Centerless grinding method of shaft member, and manufacturing method of circular shaft member |
CN107199495A (en) * | 2017-07-28 | 2017-09-26 | 广东标华科技有限公司 | A kind of new grinding wheel device |
WO2018097956A1 (en) * | 2016-11-28 | 2018-05-31 | Diamond Products, Limited | Blade head, blade and method for eliminating spacers in multiple blade stacks |
CN109551384A (en) * | 2018-12-07 | 2019-04-02 | 西安交通大学 | A kind of sharpening with self cooling and lubrication structure |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020120617A1 (en) | 2020-08-05 | 2022-02-10 | Egon Evertz Kg (Gmbh & Co) | Process and device for cylindrical grinding |
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US2730845A (en) * | 1953-05-25 | 1956-01-17 | Cincinnati Milling Machine Co | Centerless grinding machine and method |
US3376673A (en) * | 1964-09-08 | 1968-04-09 | Super Cut | Rotary cutter assembly for concrete leveler |
US4341532A (en) * | 1977-01-18 | 1982-07-27 | Daichiku Co., Ltd. | Laminated rotary grinder and method of fabrication |
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DE3422213A1 (en) † | 1983-06-29 | 1985-01-03 | Hauni-Werke Körber & Co KG, 2050 Hamburg | Surface grinding machine |
DE4235277A1 (en) † | 1992-10-20 | 1994-04-21 | Blohm Maschinenbau Gmbh | Multi-disk grinding wheel and associated grinding process - involves wheel consisting of series of disks which have abrasive layer around periphery and which are bound together on axis with intervening spacers |
US5611724A (en) † | 1995-12-01 | 1997-03-18 | General Electric Company | Grinding wheel having dead end grooves and method for grinding therewith |
US6517427B1 (en) † | 1998-02-23 | 2003-02-11 | Shin-Etsu Chemical Co., Ltd. | Abrasive-bladed multiple cutting wheel assembly |
DE20102684U1 (en) † | 2000-02-15 | 2001-04-19 | Swarovski Tyrolit Schleif | Grinding wheel |
-
2004
- 2004-12-30 DE DE602004006149T patent/DE602004006149T3/en active Active
- 2004-12-30 AT AT04425960T patent/ATE360503T1/en active
- 2004-12-30 ES ES04425960T patent/ES2286587T5/en active Active
- 2004-12-30 EP EP04425960A patent/EP1681137B2/en not_active Not-in-force
- 2004-12-30 SI SI200430354T patent/SI1681137T2/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US2730845A (en) * | 1953-05-25 | 1956-01-17 | Cincinnati Milling Machine Co | Centerless grinding machine and method |
US3376673A (en) * | 1964-09-08 | 1968-04-09 | Super Cut | Rotary cutter assembly for concrete leveler |
US4341532A (en) * | 1977-01-18 | 1982-07-27 | Daichiku Co., Ltd. | Laminated rotary grinder and method of fabrication |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITPD20090280A1 (en) * | 2009-09-25 | 2011-03-26 | Adi S P A | ABRASIVE DISC FOR MULTI-DISC WHEEL, PARTICULARLY FOR PROCESSING OF STONE MATERIALS AND RELATED MOLA AND INCLUDING THE WHEEL |
WO2011036104A1 (en) * | 2009-09-25 | 2011-03-31 | Adi S.P.A. | An abrasive disc for a multiple disc grinding machine, in particular for processing stone and like materials, and a grinding machine including said disc |
US20120225615A1 (en) * | 2009-09-25 | 2012-09-06 | Adi S.P.A. | Abrasive disc for a multiple disc grinding machine, in particular for processing stone and like materials, and a grinding machine including said disc |
JP2014050908A (en) * | 2012-09-06 | 2014-03-20 | Ngk Spark Plug Co Ltd | Centerless grinding method of shaft member, and manufacturing method of circular shaft member |
WO2018097956A1 (en) * | 2016-11-28 | 2018-05-31 | Diamond Products, Limited | Blade head, blade and method for eliminating spacers in multiple blade stacks |
CN107199495A (en) * | 2017-07-28 | 2017-09-26 | 广东标华科技有限公司 | A kind of new grinding wheel device |
CN109551384A (en) * | 2018-12-07 | 2019-04-02 | 西安交通大学 | A kind of sharpening with self cooling and lubrication structure |
Also Published As
Publication number | Publication date |
---|---|
SI1681137T1 (en) | 2007-10-31 |
ES2286587T3 (en) | 2007-12-01 |
SI1681137T2 (en) | 2011-03-31 |
ES2286587T5 (en) | 2011-04-04 |
DE602004006149T2 (en) | 2008-01-24 |
EP1681137B1 (en) | 2007-04-25 |
DE602004006149D1 (en) | 2007-06-06 |
ATE360503T1 (en) | 2007-05-15 |
EP1681137B2 (en) | 2010-11-10 |
DE602004006149T3 (en) | 2011-06-09 |
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