Claims:1. A multi-function drilling tool (19) comprises a shank (14), one end of which is secured to a spad drill insert (11) and a boring insert (12) is placed above the spad drill insert (11), wherein coated carbide chamfering insert (13) is provided at the top of the curved surface (18).
2. The multi-function drilling tool (19) as claimed in claim 1, wherein the curved surface (18) is located adjacent to a protruded part (P) of the shank (14), in which the protruded part (P) is positioned at an intermediate point across width of the shank (14), in which the curved surface is located at the end of drill flute, which guides the direction of chips coming out from the spad drill and boring inserts.
3. The multi-function drilling tool (19) as claimed in claim 1 or 2, wherein the spad drill insert (11), boring insert (12) and chamfering insert (13) are fitted to the shank (14) by grub screw (17, 16, 15) respectively.
4. The multi-function drilling tool (19) as claimed in the claims 1-3, wherein the tool (19) is secured to spindle and when the spindle is operated, the spad drill (11) makes a hole of for example: 39 mm diameter corresponding to the replacing the operation of centre drill (06) and pilot drill (07).
5. The multi-function drilling tool (19) as claimed in the claims 1-4, wherein when the tool (19) advances through vertical feed, the boring insert (12) bores 45.5mm diameter and this boring insert (12) correspondingly replaces the intermediate drill tool (08) and final drill tool (09) and 110mm depth of hole (03) is made with single pass.
6. The multi-function drilling tool (19) as claimed in the claims 1-5, wherein the chamfering insert (13) provided at the top of the curved surface (18) makes the chamfering operation for the hole (03) corresponding to the replacement of chamfering tool (10) and the curved portion (18) removes the metal chips during the operation.
7. The multi-function drilling tool (19) as claimed in the claims 1-6, wherein the tool is applicable for 110mm thickness of flange drilling range between 45.5mm to 52.00mm.
8. A method of drilling using a multi-function drilling tool (19), comprising the steps of:
- fixing a tool (19) in a spindle and configuring a shank portion (14) of the tool (19) to carry out drilling operations;
- configuring a spad drill insert (11) to make a hole and passing the tool (19) through a vertical feed;
- configuring a boring insert (12) to make a drill;
- drilling a hole (03) with a single pass and positioning a chamfering insert (13) at a top of the curved surface (18) for chamfering operation for the hole (03) and removing the metal chips during the drilling operation using the curved surface (18); and
- fitting the spad drill insert (11), the boring insert (12), the chamfering insert (13) to the tool (19) by a plurality of grub screws (15,16 and 17) to perform the drilling operation. , Description:FIELD OF INVENTION
[001] The present disclosure generally relates to a drilling operation for the high pressure valve components used in the oil field equipment assembly. More particularly this invention relates to drilling of heavier weight components like casing head and tubing spool which are to be loaded by cranes in the drilling machine. More particularly the present disclosure relates to development of single tool for multiple operation.
BACKGROUND/PRIOR ART OF THE INVENTION
[002] 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.
[003] In the manufacturing of high pressure valves used in the oil field equipment, there are two main components namely casing head and tubing spool which are used to connect the pipe lines through bolds and nuts. For this, drilling operation are to be carried out. In the case of a tubing spool 36 nos of flange holes of 45.5 mm size to 52.00 mm drilling required. In the case of casing head 24 n’s of flange holes of range from 45.5 mm to 52.00 mm size drilling required. It is not possible directly to use conventional single tool because of high thickness. In the existing method first dead center (05) is used for punching followed by center drill (06) is used in the punch mark to the required depth up to 5mm to 10mm depth Then pilot drill (07) is used to drill 15mm diameter hole followed by loading the intermediate drilling tool (08) to make 35mm diameter holes. Now the final drill (09) is used to make 45.5mm diameter hole for a depth of 110mm thickness followed by chamfering tool (10) to complete the operation. By the above method there are six tools used to get the desired number of holes on the tubing spool (01) and casing head (02) by loading the jobs in the radial drilling machine.
[004] The following table shows the time taken for a typical job in the conventional method as explained above

Sequence Activity Time in Min Cum time in Min %
time % cum. time
A Marking 120 120 18 18
B Setting 30 150 4.5 22.5
C Center Drilling 2X24=48 198 7.2 29.7
D Pilot Drilling 4X24=96 294 14.5 44.2
E intermediate Drill 5X24=120 414 18 62.2
F Final Drill 6X24=144 558 21.6 83.8
H Chamfer 2X24=48 608 702 91
G Correction 60 666 9 100
Total 666 666 100 100

Now, reference may be made to the following patents: -
[005] US Publication. No: US20060219969A1 discloses a high-pressure gate valve for control of bulk materials that includes a main body with an opening for passing bulk material, an upper body, a slideable blade, and lifting structure configured to raise the blade in a planar motion, perpendicular to the primary direction of travel and seal it against the upper body when the blade is extended. An actuating cylinder coupled with a rear edge of the blade extends and retracts the blade. A rear portion of the valve is enclosed to protect the rear edge of the blade, the actuating cylinder, and the coupling between the two.
[006] CN Publication. No: CN201735847U discloses a multi-functional drill comprising a first drill bit and a second drill bit sleeved over the first drill bit, the second drill bit has a molding penetrating trepanning arranged therein, the first drill bit penetrates telescopically in the trepanning and extends out from the lower end of the trepanning, the upper end of the trepanning is connected to an adjusting screw, and an adjusting screw is abutted against the tail end face of the first drill bit. The multi-functional drill can perform hole-drilling and chamfering at the same time, and is capable of manufacturing various stepped holes. The first drill bit can be used to drill holes and the second drill bit can be used to level head. External and internal drill bits are cooperatively connected with the spiral convex rib via the spiral groove and the length of the drill bit extended out can be regulated via the adjusting screw.
[007] US5103900A relates to a novel adapter and pin assembly that allows the close attachment of a high pressure pumping array of valves to the low pressure tubing or casing head on the well. This allows high pressure fluids or gases to be pumped through the low pressure tubing or casing head, into the tubing and down the well while isolating the low pressure tubing or casing head from these fluids or gases. The high pressure seals are tested prior to the start of the high pressure pumping, and the low pressure fittings are protected and monitored by suitable vents.
[008] However, none of the above can fulfill the requirements of the present invention for which it is designed.
OBJECTS OF THE INVENTION

[009] It is an object of the present disclosure to propose a multi-function drilling tool which obviates shortcomings of prior art.
[010] An object of the invention is to propose a multi-function drilling tool to perform the operations which was carried by multiple tools.
[011] Another object of the invention is to propose a multi-function drilling tool which reduces the setting time and engagement time for operations.
[012] Still another object of the present invention is to provide a multi-function drilling tool with use of carbide tips.
[013] These and other objects and advantages of the present invention 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 invention is illustrated.
SUMMARY OF THE INVENTION
[014] 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.
[015] According to this invention, there is provided a multi-function drilling tool comprises a shank, one end of which is secured to a spad drill insert and a boring insert is placed above the spad drill insert, wherein coated carbide chamfering insert is provided at the top of the curved surface.
[016] The curved surface is located adjacent to a protruded part of the shank, in which the protruded part is positioned at an intermediate point across width of the shank, in which the curved surface is located at the end of drill flute, which guides the direction of chips coming out from the spad drill and boring inserts.
[017] The spad drill insert, boring insert and chamfering insert are fitted to the shank by grab screw respectively.
[018] The tool is secured to spindle and when the spindle is operated, the spad drill makes a hole of for example: 39 mm die corresponding to the replacing the operation of centre drill and pilot drill.
[019] The tool advances through vertical feed, the boring insert bores 45.5mm diameter and this boring insert corresponding replaces the intermediate drill tool and final drill tool and 110mm depth of hole is made with single pass.
[020] The chamfering insert provided at the top of the curved surface makes the chamfering operation for the hole corresponding to the replacement of chamfering tool and the curved portion removes the metal chips during the operation.
[021] The tool is applicable for 110mm thickness of flange drilling range between 45.5mm to 52.00mm.
[022] A method of drilling using a multi-function drilling tool, comprising the steps of:
- fixing a tool in a spindle and configuring a shank portion of the tool to carry out drilling operations;
- configuring a spad drill insert to make a hole and passing the developed tool through a vertical feed;
- configuring a boring insert to make a drill;
- drilling a hole with a single pass and positioning a chamfering insert at a top of the curved surface for a chamfering operation for the hole and removing the metal chips during the drilling operation using the curved surface; and
- fitting the spad drill insert, the boring insert, the chamfering insert to the tool by a plurality of grub screws to perform the drilling operation.
[023] 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 figures in which like numerals represent like components.
[024] 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.
[025] 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
[026] 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 processes that are consistent with the subject matter as claimed herein, wherein: -
FIG. 1 shows various tools used in the existing method of drilling operation in accordance with the prior art;
FIG. 2 shows a step by step stage of operation in the existing method in accordance with the prior art;
FIG. 3 shows a sectional line view of a tubing spool in an embodiment of the present invention;
FIG. 4 shows a sectional view of a casing head in an embodiment of the present invention;
FIG. 5 shows a multi-function drilling tool with carbide tips fixed to perform the operation in an embodiment of the present invention;
FIG. 6 shows a position of a developed tool with work piece in an embodiment of the present invention; and
FIG. 7 shows an assembly of oil field equipment with the tubing spool and the casing head in an embodiment of the present invention.
[027] The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily 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 THE PRESENT INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS OF PREFERRED EMBODIMENTS
[028] The detailed description of various exemplary embodiments of the disclosure is described herein with reference to the accompanying drawings. It should be noted that the embodiments are described herein in such details as to clearly communicate the disclosure. However, the amount of details provided herein is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[029] It is also to be understood that various arrangements may be devised that, although not explicitly described or shown herein, embody the principles of the present disclosure. Moreover, all statements herein reciting principles, aspects, and embodiments of the present disclosure, as well as specific examples, are intended to encompass equivalents thereof.
[030] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a”, “an”, and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises”, “comprising”, “includes”, “consisting” and/or “including” when used herein, specify the presence of stated features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
[031] It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
[032] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, e.g., those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
[033] Embodiments explained herein pertain to a multi-function drilling tool to perform multiple drilling operation in a single pass for high thickness flange drilling operation.
[034] FIG. 1 shows various tools used in an existing method of drilling operation in accordance with the prior art. In the existing method a first dead center (05) is used for punching followed by center drill (06) which is used in the punch mark to the required depth up to 5mm to 10mm depth. After that a pilot drill (07) is used to drill 15mm diameter hole followed by loading an intermediate drilling tool (08) to make for example: 35mm diameter holes. The final drill (09) is used to make for example: 45.5mm diameter hole for a depth of for example: 110mm thickness followed by a chamfering tool (10) to complete a required operation. Using this traditional method six tools are used to get the desired number of holes on tubing spool (01) and casing head (02) by loading the job in the radial drilling machine.
[035] FIG. 2 shows a step by step stage of operation in the existing method in accordance with the prior art. In the existing method the drilling operation comprises following steps. Step 1: The intermediate drilling tool (08) makes the drilling of equally spaced multiple holes on a surface. Step 2. The final drill (09) is extendible and slides on either side, which guides to position the intermediate drilling tool (08) with respect to the workpiece. Step 3: The chamfering tool (10) has a bore in the same work step and carried out with a series of different tool combinations. Other tools known for this purpose are, for example, step drills with fixed step lengths, twist drills with chamfering rings which are screwed or clamped to the drills, and twist drills with spring-mounted countersunk sleeves.
[036] FIG. 3 shows a sectional line view of a tubing spool (01) in an embodiment of the present invention. The tubing spool (01) makes a plurality of flange holes ranging from 45.5 mm size to 52.00 mm during drilling operation. A hole (03) of preferred depth is made with single pass and a chamfering insert (13) (as shown in FIG.5) is provided at the top of a curved surface (18). In a preferred embodiment the curved surface (18) is a curved portion used to remove the metal chips during the operation.
[037] FIG. 4 shows a sectional view of a casing head (02) in an embodiment of the present invention. The casing head (02) makes a plurality of flange holes ranging from 45.5 mm size to 52.00 mm during drilling operation. A hole (03) of preferred depth is made with single pass and the chamfering insert (13) (as shown in FIG.5) is provided at the top of the curved surface (18).
[038] The present invention pertaining to multi-function drilling tool (19) can be best seen in Figure 5. The present invention proposes a single tool to perform various operations which was carried out by six tools. The tool makes use of coated carbide chamfering insert (13), spad drill insert (11) and boring insert (12) to perform various drilling operations.
[039] Firstly in the machine spindle (not shown) the dead centre (05) is fitted to locate the punch mark. The tool (19) is secured to the spindle in such a way that the shank portion (14) of the tool (19) fits firmly to carry out further operations. Now the spindle is operated at standard RPM while the spad drill (11) making a hole of 39mm diameter corresponding to the replacing the operation of centre drill (06) and pilot drill (07), as the tool (19) advances through vertical feed, the boring insert (12) bores for example: 45.5mm diameter and this boring insert (12) correspondingly replaces the intermediate drill tool (08) and final drill tool (09) and for example: 110mm depth of hole (03) is made with single pass and the chamfering insert (13) provided at the top of the curved surface (18). The curved surface is located the end of drill flute. It guides the direction of chips coming out from the spad drill and boring inserts. It makes the chamfering operation for the hole (03) corresponding to the replacement of chamfering tool (10) and the curved portion (18) removes the metal chips during the operation. These spad drill (11), boring insert (12), chamfering insert (13) are fitted to the tool holder (19) by grub screws (17,16 and 15) respectively. The operation is repeated to make other holes as explained above.
[040] The curved surface (18) is located adjacent to a protruded part (P) of the shank (14), in which the protruded part (P) is positioned at an intermediate point across width of the shank (14).

[041] The tool can be applicable for 110 mm thickness of flange drilling range between 45.5 mm to 52.00 mm.
[042] According to another aspect, there is provided a method of drilling using a multi-function drilling tool (19), comprising the steps of:
- fixing a tool (19) in a spindle and configuring a shank portion (14) of the tool (19) to carry out drilling operations;
- configuring a spad drill insert (11) to make a hole and passing the tool (19) through a vertical feed;
- configuring a boring insert (12) to make a drill;
- drilling a hole (03) with a single pass and positioning a chamfering insert (13) at a top of the curved surface (18) for chamfering operation for the hole (03) and removing the metal chips during the drilling operation using the curved surface (18); and
- fitting the spad drill insert (11), the boring insert (12), the chamfering insert (13) to the tool (19) by a plurality of grub screws (15,16 and 17) to perform the drilling operation.
[043] Accordingly, the tool is fitted with for example: 39 mm spad drill fastened by crub screw in the bottom for pilot drilling operation followed by another carbide tips, named as boring insert fixed in a such way to make a drill of for example: 45.5mm drill. There are two more of boring inserts fixed diametrically opposite to each other tightened by crub screws. Finally the chamfering insert fixed on the curved portion of the tool is used to make the chamfering operation to finish the drilling operation. The curved portion is used to remove the chips during the entire operation. By this developed tool eight operations are reduced to 4 operations and the machining time is reduced as illustrated in the following table.

Code Activity Min Cum Min % Cum%
A Marking 120 120 37.7 37.7
B Setting 30 150 9.4 47.1
C Center Drilling 2X24=48 198 15.2 62.3
D Pilot Drilling - - - -
E intermediate Drill - - - -
F Final Drill 5X24=120 318 37.7 100
H Chamfer - - - -
G Correction - - - -
Total =318 318 100 100

[044] From the above, it has been found that time required is 318 minutes only for a typical operation leading to time reduction of 63.3%.
Advantageous Features
- Performs multiple drilling operation in a single pass for high thickness flange drilling operation
- Simple and cost effective
- Saves time and money to increase the productivity.

[045] 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.
[046] 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.
[047] 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 analogues 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”.
[048] 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.

[049] 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.
[050] 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.
[051] 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.