DESC:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

Title of invention:
A SYSTEM AND METHOD FOR REAMING AND HONING OF FEMALE SOFT PATCH (FSP) AND MALE SOFT PATCH (MSP)

Applicant:
Mazagon Dock Shipbuilders Limited
A company Incorporated in India under the Companies Act, 1956
Under Ministry of Defence,
(A Govt. of India Undertaking)
Having address:
Dockyard Road, Mazagon,
Mumbai - 400010, Maharashtra, India

The following specification describes the invention and the manner in which it is to be performed.
CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] This patent application claims priority from Indian Provisional Application 201821042582 filed on November 13, 2018.

TECHNICAL FIELD
[002] The present disclosure described herein, in general, relates to a method and system for reaming and honing of the holes of the assembled Female Soft Patch (FSP) and Male Soft Patch (MSP) of a submarine.

BACKGROUND
[003] In any kind of submarine there is an opening called as door which is used to introduce heavy equipment and machineries inside the submarine. As it is known that the submarine is used under water hence the joints of the mating surfaces of the submarine plays very important role. These joints should be leak proof joints. The opening of the submarine comprises of the male soft patch (MSP) and a Female Soft Patch (FSP). The MSP is a cut out or door of a submarine which is configured to be mounted on the mating FSP. It may be noted that there are plurality of holes in Female Soft Patch (FSP). During manufacturing of the submarine this MSP is tried to mate with the FSP for the perfect joining of the tapered surfaces of the MSP with FSP and for marking of the holes of the FSP on the corresponding mating surface of the MSP. After marking of the holes on MSP, it is sent for drilling of marked holes. The FSP is received with each 64.5 mm hole diameter with rough cut condition from DCNS (Now Naval Group) and at least 0.5 mm machining is required in order to make it smooth. After transferring marking and drilling of the plurality of holes, the mismatch of 0.2 mm to 0.8 mm is occurred among the holes of FSP and drilled holes on Male Soft Patch (MSP).
[004] In order to transfer a hole of diameter 64.5 mm marking from FSP to MSP by punching method, an error of 0.2 to 0.3 mm mismatch occurred as hole is not uniform and also it is unfinished machined rough surface. DCNS architect had been facing many difficulties in achieving 65 mm finished hole diameter on FSP and MSP from the rough cut of 64.5 mm diameter. Also boring and reaming operations done on MSP and FSP holes took around 0.1mm material.
[005] During final alignment of female and male soft patch, a deformation occurred due to temperature variation which again creates 0.2 to 0.3 mm mismatch. Overall mismatch due to above clearly indicate that it is difficult to achieve the required size of 65 mm. So there is a requirement of machining, closest to 65 mm hole diameter.

OBJECT OF INVENTION
[006] The main object of invention is to provide a spindle for reaming and honing the holes at remote location where the reaming operation cannot be carried out with existing technology.
[007] Another object of invention is to provide a jig for machine alignment and fixture for clamping of said machine.
[008] Yet another operation of the invention is to provide a straight lock pin spindle for reaming and honing the holes.
[009] Further object of invention is to provide a spindle for reaming and honing the holes at congested areas with much ease.

BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The foregoing detailed description of embodiments is better understood when read in conjunction with the appended drawing. For the purpose of illustrating the disclosure, there is shown in the present document example constructions of the disclosure; however, the disclosure is not limited to the specific methods and apparatus disclosed in the document and the drawing.
[0011] Figure 1 illustrates a MSP and FSP mating operation for marking holes on the MSP.
[0012] Figure 2 illustrates an assembly operation of MSP on FSP.
[0013] Figure 3 illustrates a closeup view of the MSP assembly showing holes drilled on MSP.
[0014] Figure 4 illustrates a hole of two mating surfaces of MSP and FSP.
[0015] Figure 5 illustrates two holes of mating surfaces of MSP and FSP.
[0016] Figure 6 illustrates a view inside of submarine showing the mounting of the reaming machine along with spindle assembly on the flanges of the mating surface of the MSP and FSP.
[0017] Figure 7 illustrates an inside view of submarine to illustrate the reaming machine along with spindle assembly mounted on the flanges of the mating surface of the MSP and FSP.
[0018] Figure 8 illustrates a closeup view of spindle assembly to show the arrangement of various parts of spindle assembly.
[0019] Figure 9 illustrates a closeup inside view of spindle assembly mounted on pneumatic reaming machine.
[0020] Figure 10 illustrates an orthographic view of the spindle assembly.
[0021] Figure 11 illustrates an orthographic view of the spindle housing.
[0022] Figure 12 illustrates an orthographic view of the spindle lead screw.
[0023] Figure 13 illustrates an orthographic view of the Travel nut tool holder with tool.
[0024] Figure 14 illustrates an orthographic view of the Bearing holder plate.
[0025] Figure 15 illustrates an orthographic view of the pneumatic reamer with spindle assembly as of this invention mounted along with the supporting plate.
[0026] The figures depict an embodiment of the present disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following discussion that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION
[0027] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising," "having," "containing," and "including," and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. It must also be noted that, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Although any apparatuses and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary, apparatuses and methods are now described. The disclosed embodiments are merely exemplary of the disclosure, which may be embodied in various forms.
[0028] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art will readily recognize that the present disclosure is not intended to be limited to the embodiments illustrated but is to be accorded the widest scope consistent with the principles and features described herein.
[0029] Female Soft Patch (FSP) and Male Soft Patch (MSP) are two very important parts in Scorpene class submarine. It may be noted that MSP is fitted with respect to FSP. MSP has the 6670 kg theoretical weight and 4 lifting eye bolts are provided to lift the MSP. Both FSP and MSP are positioned at a fixed location by using 34 nos. shear bolts when MSP is taken off from FSP. Among those 34 nos. holes, 10 nos. each are at Port and Starboard sides while 7 nos. each at After and Forward sides.
[0030] Due to mismatch in drilled holes of FSP and MSP, it is very difficult to achieve the final diameter of 65 mm from 64.5 mm rough cut diameter. In an existing drilling assembly machine, due to vibrations and miss-alignment, final average diameter obtained in Boat-1 & Boat-2 is 69.33 mm. Also, because of vibrations, smaller depth of cut had to be taken by machining and resulting in more time for machining.
[0031] To eliminate such problems, a jig is fabricated for machine alignment, fixture for clamping and Fabricate a straight lock pin as shown in figure 1. Further a spindle is designed to carry out said operation. Figure illustrates a reaming and honing machine. The machine comprises FSP, MSP, and a reaming device. It may be noted that the reaming and honing machine is pneumatically operated and may be used at congested areas with much ease. The reaming and honing machine may be used to match the two drilled holes present on two different surfaces, mating each other with very small accuracy. More specifically, at any congested areas where reaming and honing of mating surfaces are required at any angle, the reaming and honing machine may be used to perform reaming and honing very precisely i.e. up to the tolerance of 0.01 mm.
[0032] Figure 1 shows the MSP held in a crane for mounting it on corresponding mating surfaces of the FSP. FSP is shown with plurality of holes on its flanges configured for rigidly mounting said MSP to FSP by using fastening arrangement.
[0033] Figure 2 shows the MSP held in a crane positioned for final mounting on the FSP. The holes on flanges of MSP are seen which are to be matched with the corresponding holes on flanges of FSP for mounting said MSP to FSP by using fastening arrangement.
[0034] Figure 3 shows the closer view of MSP positioned for final mounting on the FSP clearly showing the holes on flanges of MSP which are to be matched with the corresponding holes on flanges of FSP for securely mounting said MSP to FSP by using fastening arrangement.
[0035] Figure 4 shows the closer view of a hole showing the matching of the holes of MSP and FSP in the aligned position. The roughness of the holes with slight miss alignment of the holes of MSP and FSP is also seen. To provide smooth surface finish to the hole said holes have to undergo through reaming and honing operation so that the fastening pins can be effectively inserted for secured mounting of MSP to FSP.
[0036] Figure 5 shows the closer view of the location of plurality of holes on the flange of the MSP and FSP assembly.
[0037] Figure 6 shows the view of a person trying to arrange the reaming machine in holes of the MSP and FSP assembly located in congested areas of the flange the MSP and FSP assembly for carrying out reaming and honing operation of said holes of the assembly.
[0038] Figure 7 shows the view of the reaming machine mounted using the adjacent holes on the flanges of the assembly. One hole is accommodated to rigidly support said reaming machine on the flange by the support plate. The support plate is being provided by the fastening arrangement at its one end and at the other end is supporting the reaming machine with the spindle assembly, wherein the spindle assembly is inserted in the adjacent hole which is to be machined. Similarly, the mounting of said reaming machine is carried out for all the holes of the assembly to be machined. The mounting of the reaming machine has to be done in the same way as explained above in order to carry out the reaming and honing operation of all the holes of the assembly as the location of the holes on the flange of the assembly is at congested areas wherein the reaming and honing operation cannot be done normally by using available reaming machine and its attachments.
[0039] Figure 8 shows the closeup view of the reaming machine mounted using the adjacent holes on the flanges of the assembly. One hole is accommodated to rigidly support said reaming machine on the flange by the support plate. The support plate is being provided by the fastening arrangement at its one end for securely fastening said support plate along with the reaming machine with the spindle assembly in adjacent hole.
[0040] Figure 9 shows the closeup view of the spindle assembly mounted on the reaming machine. Said spindle assembly comprises of a spindle housing of a tubular structure with a profile cut along its length configured for the movement or travel of the tool holder block along the length of the spindle to facilitate reaming operation of the holes. The tool holder block is slidably engaged with the lead screw located concentrically in said spindle housing, wherein on rotatory motion of the lead screw causes axial movement or travel of said tool holder block enabling the reaming and honing operation of the said holes.
[0041] Referring to Figures 10, 11, 12, 13 and 14, Figure 10 shows the orthographic view of the spindle assembly (100) which is to be mounted on the reaming machine. Said spindle assembly comprises of a spindle housing (110) of a tubular structure with a profile cut (120) along its length configured for guiding the linear movement or travel of the tool holder block (130) along the length of the spindle (100) to facilitate reaming and honing operation of the holes. The tool holder block (130) is slidably engaged with the lead screw (140) through a internally threaded hole (260) of said tool holder block (130) located in said spindle housing (110). The lead screw (140) is rotatably supported in said housing (110) by a bearing assembly (170) at (220) of the said lead screw. The lead screw (140) is intermediately supported on the support block (150) through a bearing assembly (180). The lead screw (140) on its outer end is provided with a lever (250) configured for providing rotatory motion to the lead screw (140), wherein the rotatory motion of the lead screw (140) causes an axial movement or travel of said tool holder block (130) within the said profile cut (120) enabling the reaming and honing operation of the said holes. The feed to the said lever can be provided manually or by an automated feed mechanism.
[0042] Referring to Figures 15 shows orthographic projections of the reaming machine mounted on holes of the MSP and FSP assembly for reaming and honing operation in various views. The spindle assembly (100) mounted on the reaming machine is inserted through hole (360). Said reaming machine is rigidly supported by a support plate (310) by ensuring the rigid support from the adjacent hole (370) of MSP and FSP assembly. For providing the support to support plate a stud (340) inserted in the hole (370) of MSP and FSP assembly to project outwardly from the support plate (310) and a sleeve or collar (320) of a predetermined length is inserted between the flange (330) of MSP and FSP assembly and the support plate (310). The said stud is tightened from both the ends by nuts (350) to provide rigid support to the reaming and honing machine assembly.
[0043] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include those provided by the following features.
[0044] The proposed reaming and honing machine is specifically designed for the machining of drilled holes which are either concentric to each other or not, of two mating surfaces.
[0045] The proposed reaming and honing machine may be used at such congested areas with much ease unlike the other machines which can be used at a spacious location.
[0046] The proposed reaming and honing machine may be used for reaming and honing of surfaces at any angle (Horizontal & vertical directions).
[0047] The proposed reaming and honing machine is a light weight and may be carried from place to place easily.
,CLAIMS:
1. A system for reaming and honing operation of the holes of the assembly of female soft patch (FSP) and male soft patch (MSP) comprising:
a reaming and honing machine assembly wherein said reaming and honing machine assembly is configured with at least one spindle assembly mounted on said reaming and honing machine,
at least one support plate (310) and stud assembly for providing rigid support to said reaming and honing machine assembly.

2. The system as claimed in claim 1, wherein said spindle assembly comprises of a spindle housing (110) of a tubular structure with a profile cut (120) along its length configured for guiding the linear movement/travel of a tool holder block (130) along the length of the spindle (100) to facilitate reaming and honing operation of the holes.

3. The system as claimed in claim 2, wherein said tool holder block (130) is configured to be slidably engaged with a lead screw (140) through an internally threaded hole (260) of said tool holder block (130).

4. The system as claimed in claim 3, wherein said lead screw (140) is configured to be rotatably supported in said spindle housing (110) by a bearing assembly (170) at part (220) of the said lead screw.

5. The system as claimed in claim 3, wherein said lead screw (140) is rotatably supported on the support block (150) through a bearing assembly (180).

6. The system as claimed in claim 3, wherein said lead screw (140) on its outer end is provided with a lever (250) configured for providing rotatory motion to the lead screw (140).

7. The system as claimed in claim 6, wherein said lever (250) is configured for providing rotatory motion to lead screw (140) to facilitate an axial movement or travel of said tool holder block (130) within the said profile cut (120) enabling the reaming and honing operation of the said holes.

8. The system as claimed in claim 6, wherein said lever (250) is configured to be rotated manually or by an automated feed mechanism.

9. The system as claimed in claim 1, wherein said support plate (310) is configured with two holes, one for mounting reaming machine assembly and other for mounting stud assembly for providing rigid support to said reaming and honing machine assembly.

10. The system as claimed in claim 1, wherein said stud assembly is configured with a stud (340) inserted in the hole (370) of MSP and FSP assembly to project outwardly from the support plate (310) and a sleeve or collar (320) of a predetermined length is inserted between the flange (330) of MSP and FSP assembly and the support plate (310).

11. The system as claimed in claim 1, wherein said stud (340) is configured to be tightened from both the ends by nuts (350) to provide rigid support to the reaming and honing machine assembly through said support plate (310).

12. The system as claimed in claim 1, wherein said reaming machine is rigidly supported by a support plate (310) by ensuring the rigid support from the adjacent hole (370) of MSP and FSP assembly.

13. A method for reaming and honing of female soft patch (FSP) and male soft patch (MSP) comprising the steps of ;
• mounting of the spindle assembly of reaming and honing machine assembly in one of the holes of the support plate and subsequently to the hole of MSP and FSP assembly to be reamed;
• inserting the stud assembly through second hole of the support plate and by inserting collar between the flange (330) of MSP and FSP assembly and the support plate and subsequently through the hole of MSP and FSP assembly adjacent to the hole to be reamed for securing rigid mounting of said reaming and honing machine assembly;
• starting the pneumatic reaming and honing machine and providing the automated feed to said lever of said lead screw to facilitate the linear feed to the tool holder block for carrying out the reaming and honing operation of the hole of MSP and FSP assembly;
• once the reaming and honing operation of the targeted hole of MSP and FSP assembly is completed, the said assembly is removed and the above steps for reaming and honing operation are sequentially repeated of rest of the holes of the MSP and FSP assembly.