Claims:We Claim:
1. A machine table mountable adjustable work holder fixture F for machining of annular objects, the work holder fixture F comprising:
- a base plate (10);
- a plurality of slots (13) provided at two mutually perpendicular axes of the base plate (10);
- at least one threaded hole provided in each of the slots (13), wherein the threaded hole configured to bolt four tenons (22) on the base plate (10);
- a plurality of grooves (12) provided on the base plate (10), wherein the grooves (12) are configured to guide and position support (21) on the base plate (10);
- a plurality of T slots (11) provided on the base plate (10), wherein the T slots (11) are configured to guide and position the support (21) on the base plate (10);
- slots (14) are provided on the base plate (10), wherein the slots (14) are provided in a machine bed for clamping of the base plate (10) with the machine bed; and
- a threaded holes (15) are provided on the base plate (10), wherein the threaded holes (15) are configured for positioning of studs in the threaded holes (15), and for clamping of work piece W with the base plate (10) of fixture F.

2. The work holder fixture F as claimed in claim 1, wherein the base plate (10) forming the base of the completed work holder F.

3. The work holder fixture F as claimed in claim 1-2, wherein the four slots (13), the four grooves (12), and the four T slots (11) are provided on the base plate (10).

4. The work holder fixture F as claimed in claim 1-3, wherein the supports (12) are provided with plurality of step diameter (31) with diameter of Baffle ring Carrier.

5. The work holder fixture F as claimed in claim 1-4, wherein the supports (21) are provided with plurality of step diameter (31) with diameter of baffle ring.
, Description:FIXTURE FOR PERFORMING MACHINING OPERATIONS ON BAFFLE RING AND ITS CARRIER OF LARGE RATING TURBO-GENERATOR
FIELD OF INVENTION
[0001] The present disclosure, in general, relates to a fixture for performing machining operations on baffle ring and its carrier of large rating turbo-generator. More particularly, the present invention relates to the universally adjustable fixture/work piece holder for machining of annular objects which supports and self-centers a work piece which is mountable on a machine table.
BACKGROUND OF INVENTION
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] Work Piece holders and fixtures have been employed heretofore to facilitate the machining of objects at different planes. However, several devices of the prior art have not proven entirely satisfactory inasmuch as they are complicated in design and construction, expensive to manufacture, and difficult to use.
[0004] Present invention is described for machining of a Turbo Generator Baffle Ring and Baffle Ring Carrier in which facing, slotting, drilling, pinning, tapping and spot facing are required.
[0005] A generator is driven by turbine which is used for conversion of mechanical energy to electrical energy, wherein stator frame, rotor, end shield, seal body are the main components of turbo Generator.
[0006] Most important design criteria of a generator are class of insulation used and dissipation of heat generated due to copper loss and core loss. Even class of insulation is based on the heat sustainability of insulation. To improve the heat dissipation, generator is filled either by Hydrogen (higher rating machine)/ Air (Few low rating machine) at more than atmospheric pressure. In most of the machine this pressure is nearly 4 Bar or more.
[0007] Baffle Ring Assembly consisting of Baffle Ring and Baffle Ring Carrier being a very critical component of turbo-generator assembly, every dimension of the same is very important for proper functioning of the machine.
[0008] All the Turbo Generators (TGs) of higher rating has cooling media filled inside it, at a pressure 4 to 5 times higher than the atmospheric pressure, for better cooling of machine. This cooling media is regulated inside the generator with help of blades fitted on the rotor and baffle ring assembly done on the stator part.
[0009] For 500 MW and above rated generator, a cooler housing is place at Turbine End (TE) of the generator which houses cooler to cool the cooling media filled inside the generator.
[0010] Baffle ring along with the rotor blades provides fanning action and the hot air from inside the winding area is sucked and then pressurized on to the cooler. After passing through the cooler this gets cold and due to the negative pressure on the Exciter End (EE) it enters the stator and rotor through the EE cooling the complete winding and core.
[0011] Temperature regulation of any electric machine of very high rating is one of the very important design parameters and hence, baffle ring assembly is a very critical component of the TGs.
[0012] Baffle ring assembly, consist of two major components Baffle Ring and Baffle Ring Carrier both these components are machined on a Horizontal Boring Machine. Accurate and precise machining of these components are very important for reliable performance of the TGs.
[0013] Machining operation required to manufacture such a Baffle Ring and Baffle Ring Carrier are face machining, holes pinning, back spot facing of holes, drilling of locking holes, holes threading, window machining.
[0014] The detailed machining process of Baffle ring/ Baffle ring carrier by earlier practice is described below-
[0015] First of all, 4 equal height blocks are kept on the machine bed, prior to keeping the work piece (Baffle ring/ Baffle ring carrier) on the machine bed. Job is placed on these blocks with help of crane. In this process the job is not kept in the machine table center as blocks position with respect to machine table is not fixed. Any machining operation on the work piece can only be done if the work piece is in center with the machine table.
[0016] For centering of the work piece on the machine table, machine operator uses
[0017] Mallet to move the work piece on the machine table and then dial the work piece to achieve centering. This is not only a time-consuming process but also has adverse effect on the quality of job, as baffle ring is made up of softer material (Aluminum).
[0018] After centering of the work piece, work piece is clamped, and there are chances of shifting in the work piece during clamping as clamps are placed from the sides of the work piece.
[0019] Also, problem with the external clamping was that, T-slots are there in only one plane of the table, which make it very difficult to center the work piece in other plane and longer clamps has to be used for this purpose. Because of this force are also not equal from all four clamps.
[0020] Clamping done from the outside also leads to fouling of clamp with the machine head during few operations and their respective position needs to be changed as per the requirement, again leading to time loss.
[0021] Machining, which without a proper fixture, is to be done on the outer circumference, parting face ribs and top face of Baffle Ring and Baffle Ring Carrier not only poses a great threat to the job quality and consumes cost expensive resources but also makes the job largely dependent of operator’s dexterity in performing multiple job settings and doing the required job setting calculations. One of the challenges with this kind of machining arrangement was mismatch of pitch circle diameter, deviation in position of holes and other key design parameters on both Baffle Ring and Baffle Ring Carrier during assembly. This also increases rejection and indirectly cycle time.
[0022] Therefore, a need exists for universally adjustable work holder fixture for machining of annular objects, particularly for jobs like turbo Generator Baffle Ring and Baffle Ring Carrier that too in minimum possible job settings. Hence, the present invention has been introduced.

OBJECTS OF THE INVENTION
[0023] Some of the objects of the present disclosure, which at least one embodiment herein satisfy, are listed herein below.
[0024] It is a general or primary object of the present disclosure is to provide a machine table mountable work holder for machining of annular objects which obviates the disadvantages of the known art(s).
[0025] Another object of the invention to provide the machine table mountable work holder for machining of annular objects which is simple in construction, inexpensive to manufacture, easy to use, and easy to adjust.
[0026] Further object of the invention is to provide machine table mountable work holder for machining of annular objects which is capable of supporting the work piece relative to the cutting tool.
[0027] Furthermore object of the invention is to provide the machine table mountable work holder for machining of annular objects which can be integrated with any machine bed without major modifications.
[0028] Yet another object of the invention is to provide machine table mountable work holder for machining of annular objects which is extremely inexpensive so that the device of the invention is easily affordable by small shops and individuals.
[0029] These and other objects and advantages of the present disclosure will be apparent to those skilled in the art after a consideration of the following detailed description taken in conjunction with the accompanying drawings in which a preferred form of the present disclosure is illustrated.
SUMMARY OF THE INVENTION
[0030] This summary is provided to introduce concepts related to a machine table mountable adjustable work holder F for machining of annular objects. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
[0031] According to this invention, it has been principally decided to develop a machine table mountable adjustable work holder F for machining of annular objects. The work holder fixture F comprising a base plate. A slots provided at two mutually perpendicular axes of the base plate. A threaded hole provided in the each slots. The threaded hole configured to bolt four tenons on the base plate. A grooves is provided on the base plate. The grooves is configured to guide and position the support on the base plate. A T slots is provided on the base plate. The T slots is configured to guide and position the support on the base plate. A slots is provided on the base plate. The slots is provided in a machine bed for clamping of the base plate with the machine bed. A threaded holes is provided on the base plate. The threaded holes is configured for positioning of M36 studs in the threaded holes, and for clamping of work piece W with the base plate of fixture F.
[0032] In an aspect, the base plate forming the base of the completed work holder F.
[0033] In an aspect, the four slots, the four grooves, and the four T slots are provided on the base plate.
[0034] In an aspect, the supports are provided with plurality of step diameter with diameter of a baffle ring carrier.
[0035] In an aspect, the supports are provided with plurality of step diameter with diameter of the baffle ring carrier.
[0036] One or more drawbacks of conventional systems and process are overcome, and additional advantages are provided through the apparatus and a method as claimed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be part of the claimed disclosure.
[0037] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figure in which like numerals represent like components.
[0038] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined to form a further embodiment of the disclosure.
[0039] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[0040] The illustrated embodiments of the subject matter will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and methods that are consistent with the subject matter as claimed herein, wherein:
[0041] Fig. 1, Fig. 2 & Fig. 3 shows a schematic diagram of machine table mountable work holder for machining of annular objects, in accordance with an embodiment of the present disclosure; and
[0042] Fig. 4 shows the schematic diagram of work piece secured in the work holder, in accordance with an embodiment of the present disclosure.
[0043] The figures depict embodiments of the present subject matter for illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAIL DESCRIPTION OF INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS OF THE PREFERRED EMBODIMENTS
[0044] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to con all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0045] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0046] The present invention makes a disclosure regarding a fixture for performing machining operations on baffle ring and its carrier of large rating turbo-generator
[0047] Now, reference may be made to Figure 1, wherein like numerals refer to like and corresponding parts throughout. Here, the work holder F is disclosed to illustrate the invention comprising a machine table mountable universally adjustable base plate 10 serving as the base of the fixture F. The plate 10 is provided with four ‘T’ slots 11, four recess/grooves 12, threaded holes 15, four slots 13 for tenon 22.
[0048] For Baffle Ring- four supports 21 are made (of Aluminum). These supports are having T shaped base, the four ‘T ’slots 11 made in base plate. Also, Step diameter 31 is machined on the support with the Outer diameter of Baffle Ring.
[0049] For Baffle Ring Carrier-Another set of four supports 21 are made (of mild steel). These supports are positioned in four grooves 12 made in base plate 10. Also, Step diameter 31 is machined on the support with the Outer diameter of baffle ring carrier. Two Step diameter 31 are machined on support with different diameter at top and bottom surface of baffle ring carrier. Supports 21 are provided with threaded means 32 for clamping of support 21 with the base plate 10 of fixture F.
[0050] Also, slots 14 are provided in base plate 10 for clamping of base plate 10 with machine table. These slots 14 are plurality with slots in machine Table.
[0051] Also, four slots 13 are machined in base plate 10. In, these slots four Tenon 22 are bolted. These four tenons 22 get engaged with two mutually perpendicular slots provided in the machine table. The protruding part of tenons 22 gets engaged at four locations on two mutually perpendicular grooves on machine bed and thereby automatically guides and self centres the fixture F with the machine table centre.
[0052] Threaded holes, 15 are provided in base plate 10 of fixture F,for securing the work piece W to the fixture F and providing it rigidity.

[0053] OPERATION
[0054] During operation, the user first places the base plate 10 of fixture F on the machine Table. Four tenon 22 provided along 2 mutual perpendicular axes on base plate 10, guides and self centres base plate 10 on the machine bed, as these tenons 22 were located at positions taken reference from 2 mutually perpendicular grooves on machine bed. The protruding part of tenon 22 gets engaged with 2 mutually perpendicular slots provided in machine bed.
[0055] The base plate 10 is clamped on machine table at location of four slots 14 with aid of tenons.
[0056] After this, a clean cut is taken on base plate 10 to achieve parallelism. After this, supports 21 are positioned in its location (groove 12 /T slot 11) on base plate 10. Then, Work piece W is placed over these supports 21. Supports 21 are slided and locked at desired position as per Work piece W dia. Work piece W is clamped on fixture F with aid of M36 bolts and jacks.
[0057] The materials given above are as example without restricting scope of the invention to the same. Thus, other materials readily apparent to a person skilled in the arts are understood to be within purview of the invention.
TECHNICAL ADVANTAGES
[0058] There is a plurality of features which are listed as technical advantages below:
[0059] The present disclosure provides a machine table mountable work holder for machining of annular objects which obviates the disadvantages of the known art(s).
[0060] The present disclosure provides the machine table mountable work holder for machining of annular objects which is simple in construction, inexpensive to manufacture, easy to use, and easy to adjust.
[0061] The present disclosure provides the machine table mountable work holder for machining of annular objects which is capable of supporting the work piece relative to the cutting tool.
[0062] The present disclosure provides the machine table mountable work holder for machining of annular objects which can be integrated with any machine bed without major modifications.
[0063] The present disclosure provides the machine table mountable work holder for machining of annular objects which is extremely inexpensive so that the device of the invention is easily affordable by small shops and individuals.
[0064] The present disclosure provides the fixture, and with the help of the fixture both hard and soft materials can be clamped and machined.
[0065] The present disclosure to provide the fixture that helps to machine the material having diameter from 400mm to 2100 MM.
[0066] The present disclosure to provide the fixture, and inside boring and outside turning that can be performed on the fixture.
[0067] Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.
[0068] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.
[0069] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particulars claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances, where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B”.
[0070] The above description does not provide specific details of manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art are capable of choosing suitable manufacturing and design details.
[0071] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
[0072] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
[0073] While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.