CA2821810A1 - Perfected grinding machine and grinding method - Google Patents
Perfected grinding machine and grinding method Download PDFInfo
- Publication number
- CA2821810A1 CA2821810A1 CA2821810A CA2821810A CA2821810A1 CA 2821810 A1 CA2821810 A1 CA 2821810A1 CA 2821810 A CA2821810 A CA 2821810A CA 2821810 A CA2821810 A CA 2821810A CA 2821810 A1 CA2821810 A1 CA 2821810A1
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- Prior art keywords
- machine
- piece
- cylinder
- lunettes
- holder head
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Classifications
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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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
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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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
- B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs
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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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/065—Steady rests
-
- 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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/067—Work supports, e.g. adjustable steadies radially supporting workpieces
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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
Abstract
The present invention relates to a grinding machine (10) for operative cylinders, of the type comprising a piece-holder head (13) and a tailstock centre (12) between which an operative cylinder is positioned for being ground, said machine (10) comprising moving means (16, 90, 97) associated with both the piece-holder head (13) and the tailstock centre (12) to allow them to be moved along a common movement direction. A further object of the present invention relates to a grinding method.
Description
PERFECTED GRINDING MACHINE AND GRINDING METHOD
The present invention relates to a perfected grinding machine for operative cylinders and a method for the grinding of said cylinders.
The definition "operative cylinders" refers, for ex-ample, to cylinders of rolling mills for the rolling of metals, those used in paper-mills, those used in oil-pressure applications, shafts of marine motors and in general all cylinders made of metallic and non-metallic materials which are of industrial interest.
The grinding of the cylinders described above, and in particular cylinders of rolling-mills or paper-mills, has various drawbacks, associated first of all with the encumbrance and weight of the same which are often consi-derable.
The latter, in fact, have dimensions varying from 40 mm to 2,300 mm in diameter, 1,000 mm to 12,000 mm in length and weights ranging from a few tens of daN up to 230-250 t.
The function assigned to these cylinders requires that they be processed with a precision and accuracy in the order of a few thousandths of a millimeter.
The grinding machines which can be used for these cylinders therefore have specific characteristics and must not be confused with the smaller and traditional lathes or similar machines which, in this sense, are not capable of effecting these grinding processes.
Known grinding machines normally comprise a piece-holder head, generally fixed, whose function is to en-train the piece being processed in rotation and, in some applications, support it, and a movable tailstock centre which can be moved axially with respect to the piece-holder head and whose function is to provide an axial reference with respect to the cylinder and, in some ap-plications, also support it.
The grinding of a cylinder must always be preceded by a preliminary positioning phase of the latter on the machine, which is effected by inserting the cylinder to be ground between the piece-holder head and the tailstock centre and subsequently supporting it between centres of the machine associated with the head and tailstock cen-tre; furthermore, if necessary, said support of the cy-linder is tightened with contrast devices, also called lunettes, which, in some cases, can completely sustain the weight of the cylinder, thus eliminating the support-ing function of the head and tailstock centre. Either of the solutions is selected in relation to the type of cy-linder to be ground and the processing to be effected.
The known art generally envisages that before load-ing the cylinder, the lunettes be positioned along the base of the machine in order to house the cylinder to be ground. There can be various types of lunettes: those suitable for opposing the grinding forces in the case of cylinders supported on the tips, or suitable for support-ing the weight of the cylinder in all other cases. Fur-thermore, there can be two lunettes for the complete sup-porting of the cylinder, or at least one when the grind-ing forces must be opposed; or even no lunette at all in the case of grinding between the centres of squat cylind-ers, etc. Finally, after the positioning of the lunette has been completed, the tailstock centre must be posi-tioned, also in this case in relation to the dimensions of the cylinder. All of these activities and generally all activities aimed at adapting a grinding machine for housing a certain cylinder are defined as the set-up of the machine.
The correct positioning of the cylinder on the grinding machine therefore envisages that the tailstock centre and lunettes or contrast devices be positioned in relation to the length of the cylinder at variable dis-tances from the piece-holder head, which is fixed, by moving them in an axial direction either towards or away from the latter, depending on the length of the cylinder.
Both the tailstock centre and the lunettes or con-= trast devices are usually moved and regulated in position individually, regardless of whether these set-up opera-tions are manual or automatic.
In this case, if, on the one hand, the manual solu-tion is economical, on the other, it requires time and accuracy on the part of the operator, whereas although the automatic solution guarantees operational velocity and precision, it requires a movement and control mechan-ism for the tailstock centre and for each of the lu-nettes.
In the case of manual machines, these problems are even more serious due to the fact that cylinders having different lengths must often be ground consecutively:
these set-up operations must therefore be effected for each processing, with considerable time consumption.
In particular, not only must the tailstock centre be moved each time, but also the lunettes, as the distances from the piece-holder head (which serves as a reference) must be measured each time and all the lunettes must therefore be moved along the cylinder.
The general objective of the present invention is consequently to overcome these and other drawbacks of the known art.
This objective is achieved by a grinding machine having the characteristics specified in the first inde-pendent claim and enclosed subclaims, which should be considered as being an integrant part of the present de-scription.
In order to overcome these drawbacks, a grinding ma-chine for operative cylinders has been conceived which comprises a piece-holder head and a tailstock centre pro-vided with centres for the movement and, in some cases, support of a cylinder being processed, wherein the ma-chine comprises movement means associated with both the piece-holder head and the tailstock centre and possibly lunettes for allowing them to move along a common move-ment direction.
According to a further advantageous characteristic of the present invention, both the piece-holder head and the tailstock centre and possibly the lunettes are each associated with a single endless screw equipped with two portions having a discordant helicoidal threading, so that they can be moved simply, accurately and rapidly.
The structural and functional characteristics of the invention, as also its advantages with respect to the known art, will appear more evident form the following description, referring to the enclosed drawings which show a possible practical embodiment of the same inven-tion.
In the drawings:
- figure 1 illustrates a side view of a grinding ma-chine according to the present invention;
- figure 2 illustrates a side view in perspective of parts of the machine of figure 1;
- figure 3 illustrates a detail of the machine of the previous figures in a front view;
- figure 4 illustrates the detail of the previous figure in a side view.
With reference to figure 1, this shows a grinding machine according to the present invention.
The grinding machine 10 comprises a base 11 on which a piece-holder head 13 and tailstock centre 12 are trans-latingly assembled, which serve to move and possibly sup-port a cylinder 14 which is positioned between them dur-ing the grinding operation.
More specifically, the machine 10 represented is of the type in which the cylinder being processed is sup-ported by two rotating centres 81 and 83, positioned in the piece-holder head 13 and tailstock centre 12, whereas the lunettes 20, 21, 22 are positioned in contact with the cylinder and have the function of providing a con-trast to the possible bending of the cylinder caused by the same processing.
It should be pointed out that the machine 10 can equivalently be of a different type, in which the lu-nettes, in addition to having the function described above, also have the function of supporting the whole weight of the cylinder being processed, whereas the piece-holder head and tailstock centre only have the function of bringing it into rotation, to allow its grinding on the part of a grinding wheel or equivalent tool, or said lunettes can be completely absent, as in the case of grinding between the centres of squat cylind-ers, etc.
The piece-holder head 13 preferably comprises a sin-gle body which, in accordance with the disclosures of the present invention, is capable of translating on two li-near guides 80 with which it is coupled by means of suit-able sliding blocks.
The rotating centre 81 which, in some cases, forms a support for the cylinder 14, can be housed inside the body of the piece-holder head 13.
A motor 71, on the other hand, can be possibly posi-tioned in the rear part, with the relative transmission, for actuating the rotation of the cylinder 14.
The tailstock centre 12 also comprises a body which is capable of translating thanks to the presence of two linear guides 80 situated in the lower part of the struc-ture with which it is coupled by means of suitable slid-ing blocks.
The movable centre 83, which, in some cases, represents the second support for the cylinder, can be housed inside the body of the tailstock centre 12.
Furthermore, if this is required by the processing, as occurs, for example, in the case of the grinding of so-called "thin" cylinders, the tailstock centre 12 can have a device in the lower part, which allows a preload-ing to be generated through a spring device: this pre-loading acts in an axial direction and guarantees the continuous contact between the cylinder 14 and two mova-ble centres 81 and 83.
The machine 10 can also comprise contrast or sup-porting lunettes 20, 21, 22.
These, in the embodiment of figure 1 can also run on the guides 80 and must be present at least in one unit 20, but generally in at least three 20, 21 and 22 and normally in an odd number. Only in particular cases, when the geometry of the cylinder requires this, is the use envisaged of lunettes in an even number, i.e. without the central lunette. Consequently, except for this particular case, the set of lunettes always comprises a central lu-nette 20 or, more generally, the central lunette 20 and two side lunettes 21 and 22, or four side lunettes etc.
The machine 10 also comprises a grinding wheel which can be moved parallelly to the axis of the cylinder, not shown for the sake of concision, and in any case known in itself in this type of grinding machine.
Both the piece-holder head 13, and tailstock centre 12 and also the lunettes 20, 21 and 22 (if present) can be moved linearly along the base 11 by means of sliding blocks on the linear guides 80 so that they can move to-wards or away from each other, to house and support cyl-inders having different lengths.
For this purpose, the grinding machine 10 comprises movement means associated with both the piece-holder head, the tailstock centre and also the lunettes or con-trast devices, to allow them to move along a common move-ment direction.
In this example, the movement means comprise a end-less screw 16 coupled with both the piece-holder head 13, the tailstock centre 12, and lunettes 20, 21 and 22 so that, when brought into rotation, the screw 16 actuates both the approach or withdrawal in the same direction along which the screw 16 extends.
The latter, produced in a single piece, has two threaded portions 160 and 161 with which a corresponding sleeve of the piece-holder head 13, tailstock centre 12 and each of the lunettes 20, 21 and 22, is engaged, which will be described in further detail hereunder.
In order to prevent inversions in the rotation sense of the screw 16, the latter is provided with two threaded portions 160, 161 which have discordant have helicoidal threadings, for example an anticlockwise threading and a clockwise threading, preferably having the same pitch.
It should be pointed out that two separate helicoid-al screws with a contrasting threading can be equivalent-ly envisaged, instead of a single screw 16, or the latter may not be in a single piece but separable into different sections.
The screw 16 is actuated in rotation by a motor 17, for example an electric brushless motor or the like.
As illustrated more clearly further on, in figures 3 and 4, the movement means also comprise coupl-ing/decoupling means of the piece-holder head 13, tails-tock centre 12 and lunettes 20, 21 and 22, to the threaded sleeves engaged on the screw 16.
In this way, by acting on the coupling/decoupling means, it is possible, by actuating the screw, to move the head 13, tailstock centre 12 and lunettes 20, 21 and 22 in any combination, simply, accurately and rapidly, facilitating the set-up phase of the machine.
This feature easily enables a large quantity of movement combinations of the units 12, 13, 20, 21 and 22, to be obtained, among which the symmetrical movement of the piece-holder head and tailstock centre, particularly useful in the case of the grinding of "thin" or "Sendzimir" cylinders, which is described hereunder.
During the positioning= of the head 13 and tailstock centre 12, these must be moved in the same direction but in opposite senses (to be moved towards the ends of the cylinder). In this way, by actuating the screw 16, the piece-holder head 13 and tailstock centre 12 can be moved towards the ends of the cylinder 14 to be coupled with it and support it.
In this way, the cylinder, in spite of its dimen-sions, can be easily positioned as, once it has been ar-ranged on the machine in the correct position, the head and tailstock centre are moved until they are correctly positioned, resting at the ends of the cylinder to be processed.
This particular feature also significantly facili-tates the projecting of mechanisms of a possible automat-ic loading system, as a correct coupling of the head 13 with the cylinder can also be obtained with a simple two-axis loading device (as the head can be moved).
Furthermore, in the case described of the grinding of thin cylinders which require opposition to the grind-ing forces, it is possible, in the case of odd-numbered lunettes, to keep the central lunette fixed and symmetri-cally move the outer lunettes; whereas in the case of even-numbered lunettes, both can be equally moved symme-trically.
More generically, there can be various movement con-ditions of the parts, which should be considered as being an integral part of the method described above, among which the most significant are the following:
1) Symmetrical positioning of the lunettes, piece-holder head and tailstock centre with respect to the central reference of the machine: if only the female screw of both lunettes is integral with the screw, they will move for the same distance but in opposite senses, due to the constructive form of the endless screw. Contemporaneously the female screws of the piece-holder head and tailstock cen-tre are disengaged from the screw and these two groups consequently remain motionless. After posi-tioning the lunettes, the piece-holder head and tailstock centre are positioned by making the fe-male screws of these integral and disengaging those of the lunettes. This positioning procedure can be useful, for example, in the case of the grinding of symmetrical cylinders (for example Sendzimir).
2) Asymmetrical positioning of the piece-holder head and tailstock centre - symmetrical positioning of the lunettes: in this case, the lunettes are syn-chronously positioned, making both of the female screws of the latter integral with the screw. In this way, by actuating the screw, they will move for the same distance but in opposite senses. After positioning these two groups, their female screws are disengaged from the screw. At this point, the female screw of the piece-holder head and tailstock centre are alternatingly made integral with the screw, moving first one group and then the other.
3) Asymmetrical positioning of the lunettes, piece-holder head and tailstock centre with respect to the centre-line of the cylinder: in this case, the groups are positioned, each time making the female screw of one group integral with the screw, whereas the female screws of the other groups not involved in the movement, are disengaged. This procedure can be very useful for moving the above parts in the case of the grinding of asymmetrical cylinders (such as typically hot and cold rolling cylinders), or in applications where the piece-holder head re-mains fixed such as, in general, all applications except for the grinding of Sendzimir cylinders.
Numerous alternatives to the machine 10 described so far are possible, all considered as being an integral part of the present invention.
= 25 The selection mechanism of the parts to be moved en-visages, for each of these, a sleeve 90 which comprises a cylindrical mantle and is engaged on the endless screw 16 by means of a threading inside the mantle itself.
Each sleeve 90 can also be connected to the unit to be moved by means of a suitable mechanism.
In principle, it should be noted that, as an alter-native to the brake block system described hereunder, in the light of the disclosures provided herein, an expert in the field can also envisage other different solutions;
for example, instead of a brake block, the blocking means of the unit to be moved can comprise electromagnets, me-chanical coupling means such as fixing pegs, wedges, re-movable interference profiles or other similar items.
For illustrative and non-limiting purposes, one of these coupling/decoupling means, such as a brake block, is described hereunder.
The coupling/decoupling means of the sleeve to the part to be positioned comprise two arms 91, 92 pivoted to the structure of the part to be moved (piece-holder head, tailstock centre and lunette) and each provided with an engagement end 93, 94 with said sleeve 90 and an opposite free end 95, 96 coupled with an actuator 97.
The actuator 97 is preferably a linear actuator, for example a gas, pneumatic, hydraulic, electric actuator or similar: in the non-limited embodiment illustrated, it is a hydraulic actuator equipped with a cylinder and piston which protrudes variably from the cylinder.
The actuator 97 is coupled, preferably hinged, to the free ends 95, 96 of the arms 91, 92; each engagement end 93, 94 of each arm 91, 92 is equipped with a clamp with linings for coupling with the outer cylindrical sur-face of the sleeve 90.
The two arms 91, 92 have their fulcrum along their body in the points 0' and 0" so as to oscillate, so that as the two free ends 95, 96 approach, the opposite ends 93, 94 move away and vice versa.
The machine 10 preferably comprises a single screw 16 and both the head 13 and the tailstock centre 12 and lunettes 20, 21, 22 are equipped with these coupl-ing/decoupling means, each having a specific correspond-ing sleeve.
In this way, there is a plurality of sleeves along the body of the screw, one for each coupling/decoupling means.
The functioning can be deduced from what has been described so far: when the actuator of one of the coupl-ing/decoupling means is activated to close the linings over the corresponding sleeve, the same part of the ma-chine (head, tailstock centre or lunette) can be con-trolled in translation as a result of the rotation of the screw 16, by activating the latter, in fact, the sleeve, which is prevented from rotating, moves along the screw 16, entraining in translation the element to which the arms are pivoted.
It is therefore possible, with a simple and accurate system, to move head, tailstock centre and lunette to po-sition them correctly on the base 11, drastically reduc-ing the set-up times of the machine 10.
Furthermore, in this way, both the lunette and the head and tailstock centre can be activated contempora-neously or separately with a single command, obtaining an extremely high versatility of the machine.
Other alternatives can be envisaged, for example, the movement means for the head 13 and for the tailstock centre 12 and/or for the lunettes can be produced diffe-rently, for example by means of a transmission belt coupled with trolleys, so as to enable the movement of the head 13 and tailstock centre 12 and/or lunettes, as envisaged above.
The movement means can equivalently comprise two separate screws and two motors, even if, in this case, the cost of the machine is higher.
A grinding machine 10 as described above can also advantageously be useful for implementing a new position-ing method of an operative cylinder.
In short, in the known art, the fact that the piece-holder head is fixed implies a positioning of the cylind-er on the machine, which is effected considering the piece-holder head itself as reference, with respect to which all the relevant sizes are measured and the posi-tioning of the cylinder is effected, with negative conse-quences for both the set-up time of the machine and also for the loading means which must be used in combination with the latter.
These set-up operations in known machines can in fact be effected manually or automatically.
In the former case, this set-up time is extremely important, as a series of different operations are neces-sary, which must be effected with accuracy in order to verify their correctness. In the latter case, the reduc-tion in the set-up times jeopardizes the simplicity and reliability of the machine, as both the lunettes and tailstock centre must be equipped with suitable movement devices and relative control systems.
Another drawback linked with the known art relates to the fact that, during the loading, the cylinder must be moved in three directions and in particular, among these, also along the longitudinal axis, so as to be cor-rectly positioned on the grinding machine; these regula-tion movements require the use of a loading device.
In manual plants, this device is typically a gantry crane or a jib crane and the precision with which the cylinder must be moved and positioned requires long posi-tioning times, skilled operators and the risk that, with an erroneous manoeuvre, the cylinder, or machine, or both, can be damaged. In automatic plants, the movement of the cylinders is effected with 3-axis loading systems which if, on the one hand, they reduce the manoeuvring times and increase the safety of the same, on the other, they require machines which move the load along 3 axes and are consequently, by nature, complex, costly and re-quire maintenance. The positioning of the lunettes and tailstock centre is also quite lengthy with the tradi-tional technology, in the sense that they must be moved along the cylinder to be correctly positioned; as far as the lunettes are concerned, for example in the case of the grinding of so-called "thin" or "Sendzimir" cylin-ders, one is generally positioned in correspondence with centre-line of the cylinder and the others at its sides, but care being taken to measure the distances from the side of the cylinder associated with the piece-holder head. Also in this case, if, on the one hand, the manual solution is economical, on the other, it requires time and accuracy on the part of the operator, whereas al-though the automatic solution guarantees operational ve-locity and precision, it requires a movement and control mechanism for the tailstock centre and for each of the lunettes.
By using the machine 10 according to the present in-vention, a positioning method can be easily effected, which should also be considered an object of the present invention, which always comprises the following steps:
A- positioning the transversal, longitudinal centre-line plane of the cylinder in correspondence with a reference point situated between a movable piece-holder head and a tailstock centre of the machine;
B- moving both piece-holder head and tailstock centre un-til they are coupled with the cylinder and supporting it.
A complete version of the positioning method also envisages the following steps:
Al- preparing a rolling cylinder to be ground;
A- positioning the transversal, longitudinal centre-line plane of the cylinder in correspondence with a reference point situated between a movable piece-holder head and a tailstock centre of the machine;
B- moving both piece-holder head and tailstock centre un-til they are coupled with the cylinder and supporting it;
C- positioning at least two lunettes or contrast devices of said cylinder laterally and at equal distances from said central contrast lunette.
The reference point mentioned in step A above can possibly coincide with the positioning of the transver-sal, longitudinal centre-line plane of the cylinder in correspondence with a fixed lunette with respect to the frame of the machine and/or with respect to the side lu-nettes.
Numerous variants can obviously be applied to the method described, all object of the present invention; in this sense, some of the steps of the method can be in-verted (for example, steps B. and C. can be exchanged) or other steps of the method can be added, relating to sec-ondary regulations of the machine; or the central lu-nette, due to a particular form and geometry of the cy-linder, may not be used.
With reference to step A, the reference point, this is preferably fixed onto the machine and coincides with a lunette or contrast device, in particular with the cen-tral lunette; this lunette can obviously be removed to allow the grinding of cylinders having a particular form and geometry.
Both the piece-holder head and tailstock centre can preferably be moved so as to be always equidistant from the reference point: their movement, in other words, is of the same entity and is always effected in the same di-rection but in opposite senses.
Also with respect to the side lunettes, i.e. those situated at the sides of the central lunette which coin-cides with the reference point, these can be advanta-geously moved to the same degree and in the same direc-tion, but in opposite senses. There can be one or more of these side lunettes but always in the same quantity on both sides with respect to the central lunette.
In this way, the advantages discussed above are ob-tained, as the reference point for the whole positioning phase is no longer an end of the cylinder but its centre-line, thus overcoming the drawbacks of the known art.
The objectives mentioned in the preamble of the de-scription have therefore been achieved.
The scope of the invention is defined by the follow-ing claims.
The present invention relates to a perfected grinding machine for operative cylinders and a method for the grinding of said cylinders.
The definition "operative cylinders" refers, for ex-ample, to cylinders of rolling mills for the rolling of metals, those used in paper-mills, those used in oil-pressure applications, shafts of marine motors and in general all cylinders made of metallic and non-metallic materials which are of industrial interest.
The grinding of the cylinders described above, and in particular cylinders of rolling-mills or paper-mills, has various drawbacks, associated first of all with the encumbrance and weight of the same which are often consi-derable.
The latter, in fact, have dimensions varying from 40 mm to 2,300 mm in diameter, 1,000 mm to 12,000 mm in length and weights ranging from a few tens of daN up to 230-250 t.
The function assigned to these cylinders requires that they be processed with a precision and accuracy in the order of a few thousandths of a millimeter.
The grinding machines which can be used for these cylinders therefore have specific characteristics and must not be confused with the smaller and traditional lathes or similar machines which, in this sense, are not capable of effecting these grinding processes.
Known grinding machines normally comprise a piece-holder head, generally fixed, whose function is to en-train the piece being processed in rotation and, in some applications, support it, and a movable tailstock centre which can be moved axially with respect to the piece-holder head and whose function is to provide an axial reference with respect to the cylinder and, in some ap-plications, also support it.
The grinding of a cylinder must always be preceded by a preliminary positioning phase of the latter on the machine, which is effected by inserting the cylinder to be ground between the piece-holder head and the tailstock centre and subsequently supporting it between centres of the machine associated with the head and tailstock cen-tre; furthermore, if necessary, said support of the cy-linder is tightened with contrast devices, also called lunettes, which, in some cases, can completely sustain the weight of the cylinder, thus eliminating the support-ing function of the head and tailstock centre. Either of the solutions is selected in relation to the type of cy-linder to be ground and the processing to be effected.
The known art generally envisages that before load-ing the cylinder, the lunettes be positioned along the base of the machine in order to house the cylinder to be ground. There can be various types of lunettes: those suitable for opposing the grinding forces in the case of cylinders supported on the tips, or suitable for support-ing the weight of the cylinder in all other cases. Fur-thermore, there can be two lunettes for the complete sup-porting of the cylinder, or at least one when the grind-ing forces must be opposed; or even no lunette at all in the case of grinding between the centres of squat cylind-ers, etc. Finally, after the positioning of the lunette has been completed, the tailstock centre must be posi-tioned, also in this case in relation to the dimensions of the cylinder. All of these activities and generally all activities aimed at adapting a grinding machine for housing a certain cylinder are defined as the set-up of the machine.
The correct positioning of the cylinder on the grinding machine therefore envisages that the tailstock centre and lunettes or contrast devices be positioned in relation to the length of the cylinder at variable dis-tances from the piece-holder head, which is fixed, by moving them in an axial direction either towards or away from the latter, depending on the length of the cylinder.
Both the tailstock centre and the lunettes or con-= trast devices are usually moved and regulated in position individually, regardless of whether these set-up opera-tions are manual or automatic.
In this case, if, on the one hand, the manual solu-tion is economical, on the other, it requires time and accuracy on the part of the operator, whereas although the automatic solution guarantees operational velocity and precision, it requires a movement and control mechan-ism for the tailstock centre and for each of the lu-nettes.
In the case of manual machines, these problems are even more serious due to the fact that cylinders having different lengths must often be ground consecutively:
these set-up operations must therefore be effected for each processing, with considerable time consumption.
In particular, not only must the tailstock centre be moved each time, but also the lunettes, as the distances from the piece-holder head (which serves as a reference) must be measured each time and all the lunettes must therefore be moved along the cylinder.
The general objective of the present invention is consequently to overcome these and other drawbacks of the known art.
This objective is achieved by a grinding machine having the characteristics specified in the first inde-pendent claim and enclosed subclaims, which should be considered as being an integrant part of the present de-scription.
In order to overcome these drawbacks, a grinding ma-chine for operative cylinders has been conceived which comprises a piece-holder head and a tailstock centre pro-vided with centres for the movement and, in some cases, support of a cylinder being processed, wherein the ma-chine comprises movement means associated with both the piece-holder head and the tailstock centre and possibly lunettes for allowing them to move along a common move-ment direction.
According to a further advantageous characteristic of the present invention, both the piece-holder head and the tailstock centre and possibly the lunettes are each associated with a single endless screw equipped with two portions having a discordant helicoidal threading, so that they can be moved simply, accurately and rapidly.
The structural and functional characteristics of the invention, as also its advantages with respect to the known art, will appear more evident form the following description, referring to the enclosed drawings which show a possible practical embodiment of the same inven-tion.
In the drawings:
- figure 1 illustrates a side view of a grinding ma-chine according to the present invention;
- figure 2 illustrates a side view in perspective of parts of the machine of figure 1;
- figure 3 illustrates a detail of the machine of the previous figures in a front view;
- figure 4 illustrates the detail of the previous figure in a side view.
With reference to figure 1, this shows a grinding machine according to the present invention.
The grinding machine 10 comprises a base 11 on which a piece-holder head 13 and tailstock centre 12 are trans-latingly assembled, which serve to move and possibly sup-port a cylinder 14 which is positioned between them dur-ing the grinding operation.
More specifically, the machine 10 represented is of the type in which the cylinder being processed is sup-ported by two rotating centres 81 and 83, positioned in the piece-holder head 13 and tailstock centre 12, whereas the lunettes 20, 21, 22 are positioned in contact with the cylinder and have the function of providing a con-trast to the possible bending of the cylinder caused by the same processing.
It should be pointed out that the machine 10 can equivalently be of a different type, in which the lu-nettes, in addition to having the function described above, also have the function of supporting the whole weight of the cylinder being processed, whereas the piece-holder head and tailstock centre only have the function of bringing it into rotation, to allow its grinding on the part of a grinding wheel or equivalent tool, or said lunettes can be completely absent, as in the case of grinding between the centres of squat cylind-ers, etc.
The piece-holder head 13 preferably comprises a sin-gle body which, in accordance with the disclosures of the present invention, is capable of translating on two li-near guides 80 with which it is coupled by means of suit-able sliding blocks.
The rotating centre 81 which, in some cases, forms a support for the cylinder 14, can be housed inside the body of the piece-holder head 13.
A motor 71, on the other hand, can be possibly posi-tioned in the rear part, with the relative transmission, for actuating the rotation of the cylinder 14.
The tailstock centre 12 also comprises a body which is capable of translating thanks to the presence of two linear guides 80 situated in the lower part of the struc-ture with which it is coupled by means of suitable slid-ing blocks.
The movable centre 83, which, in some cases, represents the second support for the cylinder, can be housed inside the body of the tailstock centre 12.
Furthermore, if this is required by the processing, as occurs, for example, in the case of the grinding of so-called "thin" cylinders, the tailstock centre 12 can have a device in the lower part, which allows a preload-ing to be generated through a spring device: this pre-loading acts in an axial direction and guarantees the continuous contact between the cylinder 14 and two mova-ble centres 81 and 83.
The machine 10 can also comprise contrast or sup-porting lunettes 20, 21, 22.
These, in the embodiment of figure 1 can also run on the guides 80 and must be present at least in one unit 20, but generally in at least three 20, 21 and 22 and normally in an odd number. Only in particular cases, when the geometry of the cylinder requires this, is the use envisaged of lunettes in an even number, i.e. without the central lunette. Consequently, except for this particular case, the set of lunettes always comprises a central lu-nette 20 or, more generally, the central lunette 20 and two side lunettes 21 and 22, or four side lunettes etc.
The machine 10 also comprises a grinding wheel which can be moved parallelly to the axis of the cylinder, not shown for the sake of concision, and in any case known in itself in this type of grinding machine.
Both the piece-holder head 13, and tailstock centre 12 and also the lunettes 20, 21 and 22 (if present) can be moved linearly along the base 11 by means of sliding blocks on the linear guides 80 so that they can move to-wards or away from each other, to house and support cyl-inders having different lengths.
For this purpose, the grinding machine 10 comprises movement means associated with both the piece-holder head, the tailstock centre and also the lunettes or con-trast devices, to allow them to move along a common move-ment direction.
In this example, the movement means comprise a end-less screw 16 coupled with both the piece-holder head 13, the tailstock centre 12, and lunettes 20, 21 and 22 so that, when brought into rotation, the screw 16 actuates both the approach or withdrawal in the same direction along which the screw 16 extends.
The latter, produced in a single piece, has two threaded portions 160 and 161 with which a corresponding sleeve of the piece-holder head 13, tailstock centre 12 and each of the lunettes 20, 21 and 22, is engaged, which will be described in further detail hereunder.
In order to prevent inversions in the rotation sense of the screw 16, the latter is provided with two threaded portions 160, 161 which have discordant have helicoidal threadings, for example an anticlockwise threading and a clockwise threading, preferably having the same pitch.
It should be pointed out that two separate helicoid-al screws with a contrasting threading can be equivalent-ly envisaged, instead of a single screw 16, or the latter may not be in a single piece but separable into different sections.
The screw 16 is actuated in rotation by a motor 17, for example an electric brushless motor or the like.
As illustrated more clearly further on, in figures 3 and 4, the movement means also comprise coupl-ing/decoupling means of the piece-holder head 13, tails-tock centre 12 and lunettes 20, 21 and 22, to the threaded sleeves engaged on the screw 16.
In this way, by acting on the coupling/decoupling means, it is possible, by actuating the screw, to move the head 13, tailstock centre 12 and lunettes 20, 21 and 22 in any combination, simply, accurately and rapidly, facilitating the set-up phase of the machine.
This feature easily enables a large quantity of movement combinations of the units 12, 13, 20, 21 and 22, to be obtained, among which the symmetrical movement of the piece-holder head and tailstock centre, particularly useful in the case of the grinding of "thin" or "Sendzimir" cylinders, which is described hereunder.
During the positioning= of the head 13 and tailstock centre 12, these must be moved in the same direction but in opposite senses (to be moved towards the ends of the cylinder). In this way, by actuating the screw 16, the piece-holder head 13 and tailstock centre 12 can be moved towards the ends of the cylinder 14 to be coupled with it and support it.
In this way, the cylinder, in spite of its dimen-sions, can be easily positioned as, once it has been ar-ranged on the machine in the correct position, the head and tailstock centre are moved until they are correctly positioned, resting at the ends of the cylinder to be processed.
This particular feature also significantly facili-tates the projecting of mechanisms of a possible automat-ic loading system, as a correct coupling of the head 13 with the cylinder can also be obtained with a simple two-axis loading device (as the head can be moved).
Furthermore, in the case described of the grinding of thin cylinders which require opposition to the grind-ing forces, it is possible, in the case of odd-numbered lunettes, to keep the central lunette fixed and symmetri-cally move the outer lunettes; whereas in the case of even-numbered lunettes, both can be equally moved symme-trically.
More generically, there can be various movement con-ditions of the parts, which should be considered as being an integral part of the method described above, among which the most significant are the following:
1) Symmetrical positioning of the lunettes, piece-holder head and tailstock centre with respect to the central reference of the machine: if only the female screw of both lunettes is integral with the screw, they will move for the same distance but in opposite senses, due to the constructive form of the endless screw. Contemporaneously the female screws of the piece-holder head and tailstock cen-tre are disengaged from the screw and these two groups consequently remain motionless. After posi-tioning the lunettes, the piece-holder head and tailstock centre are positioned by making the fe-male screws of these integral and disengaging those of the lunettes. This positioning procedure can be useful, for example, in the case of the grinding of symmetrical cylinders (for example Sendzimir).
2) Asymmetrical positioning of the piece-holder head and tailstock centre - symmetrical positioning of the lunettes: in this case, the lunettes are syn-chronously positioned, making both of the female screws of the latter integral with the screw. In this way, by actuating the screw, they will move for the same distance but in opposite senses. After positioning these two groups, their female screws are disengaged from the screw. At this point, the female screw of the piece-holder head and tailstock centre are alternatingly made integral with the screw, moving first one group and then the other.
3) Asymmetrical positioning of the lunettes, piece-holder head and tailstock centre with respect to the centre-line of the cylinder: in this case, the groups are positioned, each time making the female screw of one group integral with the screw, whereas the female screws of the other groups not involved in the movement, are disengaged. This procedure can be very useful for moving the above parts in the case of the grinding of asymmetrical cylinders (such as typically hot and cold rolling cylinders), or in applications where the piece-holder head re-mains fixed such as, in general, all applications except for the grinding of Sendzimir cylinders.
Numerous alternatives to the machine 10 described so far are possible, all considered as being an integral part of the present invention.
= 25 The selection mechanism of the parts to be moved en-visages, for each of these, a sleeve 90 which comprises a cylindrical mantle and is engaged on the endless screw 16 by means of a threading inside the mantle itself.
Each sleeve 90 can also be connected to the unit to be moved by means of a suitable mechanism.
In principle, it should be noted that, as an alter-native to the brake block system described hereunder, in the light of the disclosures provided herein, an expert in the field can also envisage other different solutions;
for example, instead of a brake block, the blocking means of the unit to be moved can comprise electromagnets, me-chanical coupling means such as fixing pegs, wedges, re-movable interference profiles or other similar items.
For illustrative and non-limiting purposes, one of these coupling/decoupling means, such as a brake block, is described hereunder.
The coupling/decoupling means of the sleeve to the part to be positioned comprise two arms 91, 92 pivoted to the structure of the part to be moved (piece-holder head, tailstock centre and lunette) and each provided with an engagement end 93, 94 with said sleeve 90 and an opposite free end 95, 96 coupled with an actuator 97.
The actuator 97 is preferably a linear actuator, for example a gas, pneumatic, hydraulic, electric actuator or similar: in the non-limited embodiment illustrated, it is a hydraulic actuator equipped with a cylinder and piston which protrudes variably from the cylinder.
The actuator 97 is coupled, preferably hinged, to the free ends 95, 96 of the arms 91, 92; each engagement end 93, 94 of each arm 91, 92 is equipped with a clamp with linings for coupling with the outer cylindrical sur-face of the sleeve 90.
The two arms 91, 92 have their fulcrum along their body in the points 0' and 0" so as to oscillate, so that as the two free ends 95, 96 approach, the opposite ends 93, 94 move away and vice versa.
The machine 10 preferably comprises a single screw 16 and both the head 13 and the tailstock centre 12 and lunettes 20, 21, 22 are equipped with these coupl-ing/decoupling means, each having a specific correspond-ing sleeve.
In this way, there is a plurality of sleeves along the body of the screw, one for each coupling/decoupling means.
The functioning can be deduced from what has been described so far: when the actuator of one of the coupl-ing/decoupling means is activated to close the linings over the corresponding sleeve, the same part of the ma-chine (head, tailstock centre or lunette) can be con-trolled in translation as a result of the rotation of the screw 16, by activating the latter, in fact, the sleeve, which is prevented from rotating, moves along the screw 16, entraining in translation the element to which the arms are pivoted.
It is therefore possible, with a simple and accurate system, to move head, tailstock centre and lunette to po-sition them correctly on the base 11, drastically reduc-ing the set-up times of the machine 10.
Furthermore, in this way, both the lunette and the head and tailstock centre can be activated contempora-neously or separately with a single command, obtaining an extremely high versatility of the machine.
Other alternatives can be envisaged, for example, the movement means for the head 13 and for the tailstock centre 12 and/or for the lunettes can be produced diffe-rently, for example by means of a transmission belt coupled with trolleys, so as to enable the movement of the head 13 and tailstock centre 12 and/or lunettes, as envisaged above.
The movement means can equivalently comprise two separate screws and two motors, even if, in this case, the cost of the machine is higher.
A grinding machine 10 as described above can also advantageously be useful for implementing a new position-ing method of an operative cylinder.
In short, in the known art, the fact that the piece-holder head is fixed implies a positioning of the cylind-er on the machine, which is effected considering the piece-holder head itself as reference, with respect to which all the relevant sizes are measured and the posi-tioning of the cylinder is effected, with negative conse-quences for both the set-up time of the machine and also for the loading means which must be used in combination with the latter.
These set-up operations in known machines can in fact be effected manually or automatically.
In the former case, this set-up time is extremely important, as a series of different operations are neces-sary, which must be effected with accuracy in order to verify their correctness. In the latter case, the reduc-tion in the set-up times jeopardizes the simplicity and reliability of the machine, as both the lunettes and tailstock centre must be equipped with suitable movement devices and relative control systems.
Another drawback linked with the known art relates to the fact that, during the loading, the cylinder must be moved in three directions and in particular, among these, also along the longitudinal axis, so as to be cor-rectly positioned on the grinding machine; these regula-tion movements require the use of a loading device.
In manual plants, this device is typically a gantry crane or a jib crane and the precision with which the cylinder must be moved and positioned requires long posi-tioning times, skilled operators and the risk that, with an erroneous manoeuvre, the cylinder, or machine, or both, can be damaged. In automatic plants, the movement of the cylinders is effected with 3-axis loading systems which if, on the one hand, they reduce the manoeuvring times and increase the safety of the same, on the other, they require machines which move the load along 3 axes and are consequently, by nature, complex, costly and re-quire maintenance. The positioning of the lunettes and tailstock centre is also quite lengthy with the tradi-tional technology, in the sense that they must be moved along the cylinder to be correctly positioned; as far as the lunettes are concerned, for example in the case of the grinding of so-called "thin" or "Sendzimir" cylin-ders, one is generally positioned in correspondence with centre-line of the cylinder and the others at its sides, but care being taken to measure the distances from the side of the cylinder associated with the piece-holder head. Also in this case, if, on the one hand, the manual solution is economical, on the other, it requires time and accuracy on the part of the operator, whereas al-though the automatic solution guarantees operational ve-locity and precision, it requires a movement and control mechanism for the tailstock centre and for each of the lunettes.
By using the machine 10 according to the present in-vention, a positioning method can be easily effected, which should also be considered an object of the present invention, which always comprises the following steps:
A- positioning the transversal, longitudinal centre-line plane of the cylinder in correspondence with a reference point situated between a movable piece-holder head and a tailstock centre of the machine;
B- moving both piece-holder head and tailstock centre un-til they are coupled with the cylinder and supporting it.
A complete version of the positioning method also envisages the following steps:
Al- preparing a rolling cylinder to be ground;
A- positioning the transversal, longitudinal centre-line plane of the cylinder in correspondence with a reference point situated between a movable piece-holder head and a tailstock centre of the machine;
B- moving both piece-holder head and tailstock centre un-til they are coupled with the cylinder and supporting it;
C- positioning at least two lunettes or contrast devices of said cylinder laterally and at equal distances from said central contrast lunette.
The reference point mentioned in step A above can possibly coincide with the positioning of the transver-sal, longitudinal centre-line plane of the cylinder in correspondence with a fixed lunette with respect to the frame of the machine and/or with respect to the side lu-nettes.
Numerous variants can obviously be applied to the method described, all object of the present invention; in this sense, some of the steps of the method can be in-verted (for example, steps B. and C. can be exchanged) or other steps of the method can be added, relating to sec-ondary regulations of the machine; or the central lu-nette, due to a particular form and geometry of the cy-linder, may not be used.
With reference to step A, the reference point, this is preferably fixed onto the machine and coincides with a lunette or contrast device, in particular with the cen-tral lunette; this lunette can obviously be removed to allow the grinding of cylinders having a particular form and geometry.
Both the piece-holder head and tailstock centre can preferably be moved so as to be always equidistant from the reference point: their movement, in other words, is of the same entity and is always effected in the same di-rection but in opposite senses.
Also with respect to the side lunettes, i.e. those situated at the sides of the central lunette which coin-cides with the reference point, these can be advanta-geously moved to the same degree and in the same direc-tion, but in opposite senses. There can be one or more of these side lunettes but always in the same quantity on both sides with respect to the central lunette.
In this way, the advantages discussed above are ob-tained, as the reference point for the whole positioning phase is no longer an end of the cylinder but its centre-line, thus overcoming the drawbacks of the known art.
The objectives mentioned in the preamble of the de-scription have therefore been achieved.
The scope of the invention is defined by the follow-ing claims.
Claims (10)
1. A grinding machine (10) for operative cylinders, of the type comprising:
- a piece-holder head (13) and - a tailstock centre (12) between which an operative cylinder is positioned for being ground, characterized in that said machine (10) comprises moving means (16,90,97) associated with both the piece-holder head (13) and the tailstock centre (12) to allow them to be moved along a common movement direction.
- a piece-holder head (13) and - a tailstock centre (12) between which an operative cylinder is positioned for being ground, characterized in that said machine (10) comprises moving means (16,90,97) associated with both the piece-holder head (13) and the tailstock centre (12) to allow them to be moved along a common movement direction.
2. The grinding machine (10) according to claim 1, wherein said machine (10) also comprises one or more lunettes (20, 21, 22) or contrast devices for the cylinder, suitable for at least supporting said cylinder being processed or to contrast grinding forces, said machine (10) being equipped with moving means (16, 90, 97) associated with said lunettes (20, 21, 22) to allow them to move along said movement direction.
3. The grinding machine (10) according to claim 1 or 2, wherein said moving means (16, 90, 97) comprise an endless screw (16) associated with a base of the machine, said endless screw being arranged with its rotation axis along a parallel direction to said movement direction and having two portions (160, 161) with a discordant helicoidal threading.
4. The grinding machine (10) according to claim 3, wherein said moving means also comprise, for each of the portions (160, 161) having a discordant helicoidal threading of the screw (16), an internally threaded sleeve (90) engaged on said screw (16) and coupling/decoupling means (91,92) of said piece-holder head and/or said tailstock and/or said lunettes with said threaded sleeve.
5. The grinding machine (10) according to claim 4, wherein said coupling/decoupling means (91,92) comprise two arms with a fulcrum (91,92) along their body and each having an engagement end (93,94) with said sleeve (90) and an opposite free end (95,96) coupled with an actuator (97).
6. The grinding machine (10) according to claim 5, wherein said actuator (97) is a linear actuator coupled with said free ends (95,96) of said arms (91,92) and wherein said engagement end (93,94) of each arm (91,92) is equipped with a jaw, preferably of the type with linings, for coupling with an external cylindrical surface of said sleeve (90).
7. The grinding machine (10) according to claim 5 or 6, wherein said two arms (91, 92) have a fulcrum along their body at least at one of said piece-holder head (13) said tailstock (12) and said lunettes (20, 21, 22).
8. The grinding machine (10) according to claim 7, wherein said piece-holder head (13), said tailstock (12) and said lunettes (20, 21, 22) are each coupled with a corresponding coupling/decoupling means (91,92), a corresponding number of threaded sleeves (90) being engaged on said screw (16), each of which can be respectively coupled with each coupling/decoupling means (91,92).
9. A positioning method for operative cylinders, for example of rolling-mills or paper-mills, on a grinding machine (10) characterized in that it comprises effecting at least the following steps:
A- positioning the transversal, longitudinal centre-line plane of said cylinder in correspondence with a reference point situated between a movable piece-holder head (13) and a tailstock centre (12) of said machine (10);
B- moving said piece-holder head (13) and said tailstock centre (12) in the direction of said cylinder until there is a reciprocal coupling for entraining and/or supporting the cylinder itself.
A- positioning the transversal, longitudinal centre-line plane of said cylinder in correspondence with a reference point situated between a movable piece-holder head (13) and a tailstock centre (12) of said machine (10);
B- moving said piece-holder head (13) and said tailstock centre (12) in the direction of said cylinder until there is a reciprocal coupling for entraining and/or supporting the cylinder itself.
10. The grinding machine (10) according to one or more of the claims from 1 to 8, characterized in that it effects the method of claim 9.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI2010A002349 | 2010-12-22 | ||
| ITMI2010A002349A IT1403603B1 (en) | 2010-12-22 | 2010-12-22 | IMPROVED GRINDING MACHINE AND GRINDING METHOD |
| PCT/EP2011/006373 WO2012084159A1 (en) | 2010-12-22 | 2011-12-13 | Perfected grinding machine and grinding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2821810A1 true CA2821810A1 (en) | 2012-06-28 |
Family
ID=43737003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2821810A Abandoned CA2821810A1 (en) | 2010-12-22 | 2011-12-13 | Perfected grinding machine and grinding method |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20130309945A1 (en) |
| EP (1) | EP2655011B1 (en) |
| JP (1) | JP2014501180A (en) |
| KR (1) | KR20140045306A (en) |
| CN (1) | CN103354773A (en) |
| CA (1) | CA2821810A1 (en) |
| IT (1) | IT1403603B1 (en) |
| RU (1) | RU2013128362A (en) |
| WO (1) | WO2012084159A1 (en) |
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| CN108311965A (en) * | 2018-02-11 | 2018-07-24 | 诸暨市基麦罗进出口有限公司 | A kind of copper aluminium composite tubing new process equipment |
| CN108356618A (en) * | 2018-03-29 | 2018-08-03 | 浙江中硅新材料有限公司 | A kind of high-strength ceramic roller mill repaiies equipment |
| CN110014334B (en) * | 2019-05-24 | 2024-04-12 | 湖南创新机电技术开发有限公司 | Roller continuous grinding device |
| CN112497009A (en) * | 2020-11-30 | 2021-03-16 | 青岛凯诚绿色建筑有限公司 | Seamless steel pipe intelligence rust cleaning maintenance of equipment for building site |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB142977A (en) * | 1919-03-24 | 1920-05-20 | Richard Farren | Improvements in the construction of cutlery grinding machines |
| US2185560A (en) * | 1938-11-02 | 1940-01-02 | Norton Co | Indexing attachment for grinding machines |
| US2809472A (en) * | 1955-11-25 | 1957-10-15 | Landis Tool Co | Interlocking work drive and clamping mechanism |
| US3664066A (en) * | 1971-01-25 | 1972-05-23 | Ingersoll Milling Machine Co | Method and apparatus for aligning workpieces |
| FR2409131A1 (en) * | 1977-11-22 | 1979-06-15 | Clichy Const Sa | IMPROVEMENT IN GRINDING MACHINE PART HOLDERS |
| DE3734734A1 (en) * | 1987-10-14 | 1989-04-27 | Fortuna Werke Maschf Ag | REFLECTING ROD FOR GRINDING MACHINES |
| US5520570A (en) * | 1993-07-30 | 1996-05-28 | Litton Industrial Automation Systems Inc. | Workpiece radial locator device and method |
| GB2283192B (en) * | 1993-10-20 | 1997-07-16 | Western Atlas Uk Ltd | Improvements in and relating to grinding machines |
| CA2221102A1 (en) * | 1995-06-23 | 1997-01-09 | Western Atlas U.K. Limited | Improvements in and relating to grinding |
| US6273785B1 (en) * | 1998-09-02 | 2001-08-14 | Xerox Corporation | Non-contact support for cyclindrical machining |
| EP1342536A1 (en) * | 2002-03-02 | 2003-09-10 | Hegenscheidt-MFD GmbH & Co. KG | Apparatus for rotatively driving a crankshaft |
| JP2005169530A (en) * | 2003-12-09 | 2005-06-30 | Nissan Motor Co Ltd | Grinding machine and grinding method |
| JP4466142B2 (en) * | 2004-03-16 | 2010-05-26 | 株式会社ジェイテクト | Machine tool with steady rest |
| US20080139092A1 (en) * | 2006-12-08 | 2008-06-12 | Lessway Richard J | Steady rest for rotating shaft |
| DE102007019588A1 (en) * | 2007-04-24 | 2008-10-30 | Cnc-Service Egger | Vibration-free processing of pilgrims' spines |
| CN101513722B (en) * | 2008-02-18 | 2012-01-25 | 鸿富锦精密工业（深圳）有限公司 | Circle rolling device |
| CN101462244B (en) * | 2009-01-13 | 2011-10-05 | 常州市腾田液压机械有限公司 | Equipment for grinding surface of long shaft workpiece |
| DE102009024209B4 (en) * | 2009-06-08 | 2012-12-06 | Erwin Junker Maschinenfabrik Gmbh | METHOD AND DEVICE FOR MULTILAYER GRINDING OF WORKPIECES |
| DE102009051737B3 (en) * | 2009-11-03 | 2010-10-07 | Erwin Junker Maschinenfabrik Gmbh | Method for grinding main and pin bearings of crankshaft by external cylindrical grinding in grinding machine, involves bringing defined geometric longitudinal axis of crankshaft in accordance with rotation axis of assigned workpiece |
-
2010
- 2010-12-22 IT ITMI2010A002349A patent/IT1403603B1/en active
-
2011
- 2011-12-13 WO PCT/EP2011/006373 patent/WO2012084159A1/en active Application Filing
- 2011-12-13 CN CN2011800664242A patent/CN103354773A/en active Pending
- 2011-12-13 KR KR1020137018301A patent/KR20140045306A/en not_active Application Discontinuation
- 2011-12-13 CA CA2821810A patent/CA2821810A1/en not_active Abandoned
- 2011-12-13 JP JP2013545092A patent/JP2014501180A/en not_active Abandoned
- 2011-12-13 RU RU2013128362/02A patent/RU2013128362A/en not_active Application Discontinuation
- 2011-12-13 US US13/994,611 patent/US20130309945A1/en not_active Abandoned
- 2011-12-13 EP EP11804957.6A patent/EP2655011B1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| US20130309945A1 (en) | 2013-11-21 |
| KR20140045306A (en) | 2014-04-16 |
| WO2012084159A1 (en) | 2012-06-28 |
| EP2655011B1 (en) | 2014-07-30 |
| EP2655011A1 (en) | 2013-10-30 |
| CN103354773A (en) | 2013-10-16 |
| ITMI20102349A1 (en) | 2012-06-23 |
| RU2013128362A (en) | 2015-01-27 |
| IT1403603B1 (en) | 2013-10-31 |
| JP2014501180A (en) | 2014-01-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |
Effective date: 20161214 |