DESC:FIELD
The present disclosure relates to the field of mechanical engineering. In particular, the present disclosure relates to an arrangement for internal grinding of a bore, typically a gear bore.
BACKGROUND
Gears having an internal groove or an internal rib defined in the inner periphery of the gear bore are used in automotive industry, to accommodate or support either a spring clip, or a roller bearing, or any other component. The manufacturing of such gears is a difficult and a time consuming operation since, two operational cycles are required to be performed on such gear bore in order to accommodate the internal groove or the internal rib formation therein. As such, the time required for the manufacturing of such gear is increased. An increase in the manufacturing time directly affects the plant productivity of the gear manufacturing plant. Furthermore, another disadvantage related to the conventional grinding process for grinding of the gear bore is the formation of unwanted taper within the gear bore. The unwanted taper formation within the gear bore is because of the high speed rotation of the grinding wheel that is mounted on a cantilever quill, which causes the deformation of the quill, thereby affecting the grinding profile of the gear bore.
Hence, in order to overcome the above mentioned drawbacks, there is a need for an arrangement for internal grinding of a bore that reduces the manufacturing time of the gear. Furthermore, there is a need for an arrangement for internal grinding of a bore that prevents the unwanted taper formation within the gear bore.

OBJECTS
Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows.
It is an object of the present disclosure to ameliorate one or more problems of the prior art or to at least provide a useful alternative.
An object of the present disclosure is to provide an arrangement for internal grinding of a bore that reduces manufacturing time.
Another object of the present disclosure is to provide an arrangement for internal grinding of a bore that prevents the unwanted taper formation within the bore.
Still another object of the present disclosure is to provide an arrangement for internal grinding of a bore that increases the manufacturing plant productivity.
Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.
SUMMARY
The present disclosure envisages an arrangement for internal grinding of a bore of a component. The bore of the component is defined by the wall surrounding the bore. The arrangement for internal grinding of the bore comprises a holding structure that is adapted to hold the component having the bore. A quill is rotatably coupled to a spindle of a motor. The quill is defined by an operative first end, a shaft portion, and an operative second end. A plurality of grinding wheels is mounted on the shaft portion and is configured to be introduced into the bore and abut the wall of the bore thereof to facilitate grinding operation at multiple locations within the bore.
In an embodiment, the plurality of grinding wheels is mounted proximal to the operative first end of the quill.
In another embedment, the arrangement includes a spacer that is disposed on the shaft portion of the quill, and is operatively between the plurality of grinding wheels.
In an embodiment, the quill has two grinding wheels that are spaced apart by the spacer.
In another embodiment, the plurality of grinding wheels and the spacer are held on the quill by means of fasteners, or a wheel mounting screw.
In an embodiment, the quill is made of an alloy of tungsten, preferably densimet.
In another embodiment, the motor is rotatable at a speed of 20,000 RPM.
In an embodiment, the diameter of the spacer is less than the diameter of the plurality of grinding wheels.
BRIEF DESCRIPTION OF ACCOMPANYING DRAWING
An arrangement for internal grinding of a bore will now be described with the help of the accompanying drawings in which:
Fig. 1 illustrates an isometric view of an arrangement for internal grinding of a bore, in accordance with an embodiment of the present disclosure; and
Fig. 2 illustrates a sectional view and a top view of a quill with grinding wheels mounted thereon, used in the arrangement of Fig. 1.
LIST OF REFERENCE NUMERALS
100 – Arrangement for internal grinding of a bore
102 – Quill
102A – Operative first end
102B – Operative second end
102C – Shaft portion
104 – Plurality of grinding wheels
106 – Component
108 – Holding structure
110 – Spindle
112 – Spacer
114 – Wheel mounting screw
DETAILED DESCRIPTION
The present disclosure envisages an arrangement for internal grinding of a bore of a component. The arrangement includes a holding structure that is adapted to hold the component having the bore. A quill is rotatably coupled to a spindle of a motor and is defined by an operative first end, shaft portion, and an operative second end. The quill comprises a plurality of grinding wheels, and a spacer. The plurality of grinding wheels is mounted on the shaft portion that is proximal to the operative first end of the quill. The plurality of grinding wheels is configured to be introduced into the bore and abut the wall thereof to facilitate grinding operation at multiple locations within the bore of the component. The spacer is disposed operatively between the plurality of grinding wheels on the shaft portion of the quill.
A preferred embodiment of an arrangement for internal grinding of a bore, of the present disclosure will now be described in detail with reference to the accompanying drawing. The preferred embodiment does not limit the scope and ambit of the disclosure. The description provided is purely by way of example and illustration.
Fig. 1 illustrates an isometric view of an arrangement for internal grinding of a bore 100 (hereinafter referred to as “arrangement 100”), typically of a component 106 having a bore, in accordance with an embodiment of the present disclosure. As seen in Fig. 1, the arrangement 100 comprises a quill 102 having a plurality of grinding wheels 104 mounted thereon. In an exemplary embodiment, the quill 102 includes two grinding wheels. However, the number of the grinding wheels is not restricted to two. Other embodiments having more than two grinding wheels mounted on the quill to manufacture components having more than one internal groove are well within the ambit of the present disclosure. The arrangement 100 further includes a component 106 that is held in place by means of a holding structure 108. In an embodiment, the component 106 is a gear having a bore. The quill 102 is rotatably coupled with a spindle 110 of a motor (not shown in the figures). In another embodiment, the motor is rotatable at a speed of 20,000 revolutions per minute (RPM).
Fig. 2 illustrates a sectional view and a top view of the quill 102 with a plurality of grinding wheels 104 mounted thereon. The quill 102 has a first operative end 102A and a second operative end 102B. The plurality of grinding wheels 104 is mounted on a shaft portion 102C of the quill 102. A spacer 112 is mounted on the shaft portion 102C operatively between the grinding wheels 104. The plurality of grinding wheels 104 and the spacer 112 are securely held on the quill 102 by means of a wheel mounting screw 114. In an embodiment, the plurality of grinding wheels 104 and the spacer 112 are held on the quill 102 by means of a fasteners (not shown in the figures).
In an operative configuration, the quill 102 is rotatable about its longitudinal axis. With the plurality of grinding wheels 104 mounted thereon, the quill 102 is displaced such that the plurality of grinding wheels 104 are inserted within the bore of the component 106. Subsequent to the insertion, the quill 102 is rotated by means of the spindle 110, thereby rotating the plurality of grinding wheels 104 and the spacer 112 mounted on the shaft portion 102C of the quill 102. In an embodiment, the spindle 110 is the spindle of the motor. The spacer 112 is disposed operatively between the plurality of grinding wheels 104. The plurality of grinding wheels (104) is configured to be introduced into the bore and abut the wall thereof to facilitate the grinding operation at multiple locations within the bore of the component 106 in a single operational cycle. As such, the drawback associated with the conventional arrangement, i.e., the use of a single grinding wheel for grinding the bore of the component 106 at multiple locations in multiple operational cycles is overcome by the arrangement 100 of the present disclosure.
The quill 102 of the present disclosure is made from densimet. Densimet is a tungsten alloy comprising nickel, iron, molybdenum, and copper. However, the material for the quill 102 is not limited to densimet, and the use of materials having material properties similar to densimet are also within the ambit of the present disclosure. The use of the material densimet and an optimized length of the quill 102 provides an increased dynamic stiffness to the quill 102. In an embodiment, a cantilever configuration having a plurality of grinding wheels 104 mounted near the free end or the operative first end 102A of the quill 102 is used. As such, the grinding profile of the bore, typically the bore of the component 106, is not altered and the formation of unwanted tapers is prevented by the use of the arrangement 100 of the present disclosure.
In an embodiment, the diameter of the spacer 112 is less than that of the grinding wheels 104. Thus, the grinding operation causes formation of an internal circular rib operativey between the two bores of the component 106.
The arrangement 100 of the present disclosure enables grinding at multiple locations within the bore of the component 106, in a single operational cycle, thereby decreasing cycle time required to manufacture the component 106, typically the gear. A decreased cycle time improves the plant productivity of the manufacturing plant.

TECHNICAL ADVANCES AND ECONOMICAL SIGNIFICANCE
The present disclosure described herein above has several technical advantages including but not limited to the realization of an arrangement for internal grinding of a gear bore that:
- reduces the manufacturing time of the component having a bore;
- prevents unwanted taper formation within the bore; and
- increases the manufacturing plant productivity.
The disclosure has been described with reference to the accompanying embodiments which do not limit the scope and ambit of the disclosure. The description provided is purely by way of example and illustration.
The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
The foregoing description of the specific embodiments so fully revealed the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.
The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.
Any discussion of documents, acts, materials, devices, articles or the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.
While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.
,CLAIMS:1. An arrangement (100) for internal grinding of a bore of a component (106), the bore defined by a wall surrounding the bore, said arrangement comprising:
a holding structure (108) adapted to hold said component (106);
a quill (102) rotatably coupled to a spindle (110) of a motor, said quill (102) defined by an operative first end (102A), a shaft portion (102C) and an operative second end (102B); and
a plurality of grinding wheels (104) mounted on said shaft portion (102C), said plurality of grinding wheels (104) configured to be introduced into the bore and abut the wall thereof to facilitate grinding operation at multiple locations within the bore.
2. The arrangement as claimed in claim 1, wherein said plurality of grinding wheels (104) are mounted proximal to said operative first end (102A) of said quill (102),
3. The arrangement as claimed in claim 1, which includes a spacer (112) disposed operatively between said plurality of grinding wheels (104) on said shaft portion (102C) of said quill (102).
4. The arrangement as claimed in claim 3, wherein said quill (102) has two grinding wheels (104) spaced apart by means of said spacer (112).
5. The arrangement as claimed in claim 3, wherein said plurality of grinding wheels (104) and said spacer (112) are held on said quill (102) by means of fasteners, or a wheel mounting screw (114).
6. The arrangement as claimed in claim 3, wherein the diameter of said spacer (112) is less than the diameter of said plurality of grinding wheels (104).
7. The arrangement as claimed in claim 1, wherein said quill (102) is made of an alloy of tungsten.
8. The arrangement as claimed in claim 7, wherein said alloy of tungsten is densimet.
9. The arrangement as claimed in claim 1, wherein said motor is rotatable at a speed of 20,000 RPM.