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 MILLING MACHINE FOR PERFORMING DRILLING OPERATION

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 particularly describes the invention and the manner in which it is
to be performed.

CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] The present application claims priority from Indian provisional application no. 201821043999 filed on 22nd November 2018.
TECHNICAL FIELD
[002] The present disclosure in general relates to the field of manufacturing and more specifically, to a drilling assembly for a milling machine.
BACKGROUND
[003] A milling machine is a backbone of the manufacturing industries. In the milling machine, various machining operations like turning, facing, chamfering etc. are performed. Main parts of the milling machine include a milling head, a milling tool, a worktable and a power feed system. The milling machine for a submarine requires a large space and is used for machining of the frames and other parts of the submarine. Generally, a separate drilling machine is required to perform a drilling operation. The separate drilling machine for drilling the machined parts of the submarine requires a huge space, a regular maintenance and a huge investment. Therefore, a system or a device is required to perform the drilling operation without using the separate drilling machine.
[004] The information disclosed in this background of the disclosure section is only for enhancement of understanding of the general background of the disclosure and should not be taken as an acknowledgement or any form of suggestion that this information forms prior art already known to a person skilled in the art.
SUMMARY
[005] Before the present subject matter is described, it is to be understood that this application is not limited to a particular device fitted on a milling machine, as there may be multiple possible embodiments, which are not expressly illustrated in the present disclosures. It is also to be understood that the terminology used in the description is for the purpose of describing the particular implementations, versions, or embodiments only, and is not intended to limit the scope of the present application. This summary is provided to introduce aspects related to a drilling assembly to perform a drilling operation on the milling machine. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.
[006] The present subject matter discloses a drilling assembly for a milling machine. The drilling assembly may comprise a base, a drilling spindle and a drill bit. Further, the base may be connected to a milling head of the milling machine. Further, the drilling spindle may comprise a tapered recess to receive the drill bit. The drill bit comprising a tapered end is friction fitted into the tapered recess of the drilling spindle.
[007] Hence it is an objective of the present invention to provide a drilling assembly for an existing milling machine.
BRIEF DESCRIPTION OF DRAWINGS
[008] The foregoing detailed description of embodiments is better understood when read in conjunction with the appended drawings. For the purpose of illustrating the present subject matter, an example of construction of the present subject matter is provided as figures; however, the present subject matter is not limited to a specific system or a device disclosed in the document and the figures.
[009] The present subject matter is described in detail with reference to the accompanying figures. The same numbers are used throughout the drawings to refer various features of the present subject matter.
[0010] Figure 1 illustrates a front view of a drilling assembly for a milling machine, in accordance with an embodiment of the present subject matter.
[0011] Figure 2 illustrates a top view of the drilling assembly for the milling machine, in accordance with an embodiment of the present subject matter.
DETAILED DESCRIPTION
[0012] 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 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 as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Although any devices similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary devices are now described. The disclosed embodiments are merely exemplary of the disclosure, which may be embodied in various forms.
[0013] 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 described but is to be accorded the widest scope consist in this regard, in a generic sense.
[0014] A milling machine used for machining of a submarine part may comprises a spindle, a milling head, a milling tool, a handwheel, a ram, a power feed system wherein x, y and z feeds are controlled. The spindle of the milling machine may move in upward and downward direction with help of the handwheel. The ram may move in to & fro direction with help of the handwheel. The milling machine may comprise a worktable with a plurality of hydraulic jacks for holding a workpiece. The worktable of the milling machine may rotate in 360 degrees. In order to perform a milling operation, the worktable may be rotated in specific angle with reference to the milling tool. The milling tool may rotate to remove a material from the workpiece. Along with the machining of submarine parts, the submarine parts may also require drilling. However, an existing milling machine do not have any facility of drilling. An installation of a separate drilling machine may be required. Due to a large size of the submarine parts, the drilling machine for drilling of the submarine parts may require a huge space, a regular maintenance and a huge investment.

[0015] The present subject matter relates to a replacement of the milling tool by a drilling assembly for drilling the submarine parts. The drilling assembly may be connected to the milling head with help of a plurality of bolts. The drilling assembly may comprise a base, a drilling spindle and a drill bit. The drilling spindle may be mounted on the base. The drill bit is removably fitted to the drilling spindle. The drilling assembly may rotate in order to perform a drilling operation. To move the drilling assembly with respect to the workpiece, the handwheel may be provided.

[0016] The proposed assembly for drilling may eliminate the requirement of the separate drilling machine. By using the proposed drilling assembly, additional maintenance cost may be eliminated, as the drilling assembly is fitted to the existing milling machine. The drilling assembly is the replacement of the milling cutter whenever the drilling operation is to be performed, hence, eliminates the huge space requirement and investment to install the separate drilling machine.
[0017] Now referring to Figure 1, a front view of a drilling assembly 100 for a milling machine is illustrated in accordance with the present subject matter. The drilling assembly 100 comprises a base 101, a drilling spindle 102 and a drill bit 103. The base 101 comprises a plurality of holes 104 for bolting the base 101 to a milling head 106. In an embodiment, the base 101 of the present subject matter may comprise a circular shape with the plurality of holes 104. The drilling spindle 102 may be mounted on the base 101 of the milling machine. In an embodiment, the base 101 and the drilling spindle 102 may form a single integrated part. Further, the drilling spindle 102 comprises a tapered recess 108 and at least one key slot 105. The drilling spindle 102 may comprise a cylindrical shape. The tapered recess 108 of the drilling spindle 102 may receive the drill bit 103. The key slot 105 of the drilling spindle 102 is provided to hold the drill bit 103. The drill bit 103 comprises a tapered end 109. The tapered end 109 may be friction fitted into the tapered recess 108 of the drilling spindle 102. Another end of the drill bit 103 is used for drilling the hole in a workpiece.
[0018] The drill bit 103 may be removed from the drilling spindle 102. In an embodiment, for drilling the hole of different size, the drill bit 103 of different size may be fitted in the drilling spindle 102.
[0019] The drilling assembly 100 rotates along with the milling head 106 during the drilling operation. A depth of drill hole required in the workpiece may be given as input in a power feed system. A speed of the drilling assembly 100 may be manipulated. A coolant may be circulated during the drilling operation, so as to prevent an overheating of the drilling assembly 100.
[0020] Figure 2 illustrates a top view of the drilling assembly 100 for the milling machine, in accordance with an embodiment of the present subject matter. The base 101 of the drilling assembly 100 may comprise the plurality of holes 104. An alignment of the holes 104 of the base 101 may be matched with an alignment of the holes of the milling head 106. The holes 104 of the base 101 may be of equal dimension. The base 101 is fastened to the milling head 106 by a plurality of fastening elements and the holes 104 may act as a provision for the plurality of fastening elements. In an embodiment, the plurality of fastening elements used are the plurality of bolts 107. The base 101 and the milling head 106 may comprise an equal diameter.
[0021] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include the following:
[0022] The proposed design of a milling machine for a drilling operation is facilitated with very less modification, wherein only a milling cutter is replaced by a drilling spindle.
[0023] The proposed design of the milling machine for the drilling operation may facilitates drilling of various type of drill holes.
[0024] The proposed design of the milling machine for the drilling operation may eliminate a requirement of a separate drilling machine.
[0025] The proposed design of the milling machine for the drilling operation may eliminate a huge space requirement.
[0026] The proposed design of the milling machine for the drilling operation may eliminate an investment cost required for a new drilling machine.
[0027] The proposed design of the milling machine for the drilling operation may eliminate a regular maintenance requirement.
,CLAIMS:
1. A drilling assembly (100) for a milling machine, wherein the drilling assembly (100) comprises:
a base (101), wherein the base (101) is removably connected to a milling head (106) of the milling machine;
a drilling spindle (102) mounted on the base (101), wherein the drilling spindle (102) comprises a tapered recess (108); and
a drill bit (103) configured to be fitted in the drilling spindle (102), wherein a tapered end (109) of the drill bit (103) is friction fitted in the tapered recess (108) of the drilling spindle (102).

2. The drilling assembly (100) of claim 1, wherein the base (101) is removably connected to the milling head (106) with a plurality of bolts (107).

3. The drilling assembly (100) of claim 1, wherein the drilling spindle (102) comprises at least one key slot (105) to hold the drill bit (103) in the drilling spindle (102).

4. The drilling assembly (100) of claim 1, wherein the drilling assembly (100) rotates with the milling head (106) during a drilling operation.

5. The drilling assembly (100) of claim 1, wherein the base (101) and the drilling spindle (102) forms a single integrated part.

6. The drilling assembly (100) of claim 1, wherein the drilling spindle 102 is cylindrical in shape.