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 STRAIGHT CUTTING EDGE FOR MOTOR GRADER BLADE ASSEMBLY AND METHOD TO PRODUCE THEREOF

Applicant:
BEML Limited
A company Incorporated in India under the Companies Act, 1956
Having Address As:
BEML Soudha, 23/1, 4th Main,
Sampangirama Nagar, Bengaluru - 560 027,
Karnataka, 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 invention claims priority from Indian patent application numbered IN 202341084512 filed on 11th December, 2023.
FIELD OF THE INVENTION

[002] The present invention relates to a grader blade assembly of a motor grader. More particularly, the present invention relates to a motor grader blade assembly with a straight cutting edge made of alloy steel.

BACKGROUND

[003] Usually blades of motor graders or any other heavy off-highway machines are subjected to various stresses and wear while working in the field. The primary function of blade in motor grader is to perform task like levelling the surfaces, spreading and mixing of materials in construction sites and mines. Indian mines have a variety of soil conditions like hard, soft and abrasive type soil which directly affect the life of cutting edge. When the existing cutting edges undergoes heavier loads and stresses, the motor grader blades needs replacement. Frequent replacement of such blades increases the cost of operation. The motor grader blade tips get affected during operations like cutting undulations, filling up low spots and rough grading.
[004] Generally, these blades are made of steel or steel-based metals with high wear resistance properties. The existing blades are sometimes having inserts or the leading edge of the blade is embedded with tungsten or boron material. The inserts are fitted on the blade by welding, brazing or fastening with nuts and bolts. The existing cutting edge is available in curved shape with or without serrated edges which needs to be imported and increases cost of the product. Addition of boron or tungsten material to improve the mechanical properties of blade material increases cost of production and it is also subjected to availability.

PRIOR ART:
[005] In SE418622B discloses road-working cutters are made of a steel substantially containing iron and impurities. The cutters can be hardened by quenching in oil, which produces a fine-grained structure of so-called rib martensite.
[006] In US5881480A (figure 1) discloses a single high wear-resistant grader blade (100) mounted on the moldboard/blade assembly (110), which combines two high wear-resistant elements in the lower end of the blade (100). Firstly, high wear-resistant particles are embedded into the front leading edge (300) of the blade (100). Further, a groove is milled down the center of the grader blade (100) and high wear-resistant inserts laid end-to-end are brazed into the groove. Thus, the leading edge (300) of the grader blade (100) is formed of a mixture of tungsten carbide and the grader blade material. More particularly, grader blades (100) having carbide inserts or other wear resistant welded surfaces along the ground engaging edge for better wear resistance.
[007] In CN100384585C (figure 2) discloses a method for manufacturing a high abrasion resistance grader cutter blade with working faces (1, 2, 3) of simple technology and low cost. The grader cutter blade which is casted from a steel alloy and/or processed by a machine. The grader cutter blade undergoes annealing process for more than 1 hours, and then the cutter blade is carried out with ion injection carburization tungstenizing followed by quenching.
[008] Hence, there is a need to develop a motor grader blade with a straight cutting edge, having improved mechanical properties and made up of locally available material with minimized cost.

OBJECTS OF THE INVENTION

[009] Main object of the present disclosure is to provide a straight cutting edge design for a motor grader blade assembly.
[0010] Another objective of the present disclosure is to provide the straight cutting edge design for the motor grader blade assembly made of high strength and abrasion resistant alloy steel.
[0011] Yet another objective of the present disclosure is to provide the straight cutting edge made of alloy steel with finer grain and martensite microstructure.
[0012] Another objective of the present disclosure is to provide the straight cutting edge to work with a balance of precision, speed and material removal.
[0013] Yet another objective of the present disclosure is to provide a minimum blade angle of the straight cutting edge to effectively perform operations like levelling, spreading and mixing for the motor grader applications.
[0014] Another objective of the present disclosure is to provide the straight cutting edge made up of locally available material with minimized cost.

SUMMARY

[0015] Before the present a straight cutting edge for motor grader blade assembly and method to produce thereof is described, it is to be understood that this application is not limited to a particular motor grader application 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 the straight cutting edge for motor grader blade assembly and method to produce thereof. 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.
[0016] The invention discloses a straight cutting edge for a motor grader blade assembly and method to produce thereof. The straight cutting edge for a motor grader blade assembly comprising a motor grader blade assembly; plurality of straight cutting edges configured of a high strength and abrasion resistant alloy steel constituted of 0.2% of carbon (C), 1.5% of manganese (Mn), 0.035% of sulphur (S), 0.035% of phosphorous (P), 0.045% of silicon (Si), 0,005-0.005% of vanadium (V), 0.1% titanium (Ti), zirconium (Zr) and iron (Fe) components to be mounted on the motor grader blade assembly; plurality of holes provided on the lower end of the motor grader blade assembly configured to mount the plurality of straight cutting edges; plurality of holes provided on an upper end of straight cutting edge configured for mounting the straight cutting edge on the motor grader blade assembly through fastening means.
[0017] Further, the straight cutting-edge is made of a front surface, a bottom surface, an upper surface and a rear surface. A first chamfered edge is machined at 5° between the upper surface and the rear surface for mounting the straight cutting edge on the motor grader blade assembly. A second chamfered edge is machined at 30° between the upper surface and the rear surface for mounting the straight cutting edge on the motor grader blade assembly. A third chamfered edge is machined at a propulsion angle of 37° between the bottom surface and the rear surface. The fastening means are hardened washers, nuts and bolts. The straight cutting edge possesses an ultimate tensile strength of 790 N/mm2, yield strength of 690 N/mm2, elongation of 16% (on gauge length of 50mm), an impact strength of 40J at -40°C and hardness between 240 to 300 BHN.
[0018] Further, the present invention also discloses a method to produce the straight cutting edge for the motor grader blade assembly comprising steps of flame cutting a work piece of desired dimension from the high strength and abrasion resistant material; grinding and deburring the said work piece; straightening and cleaning of the said work piece by shot blasting; coating the work piece with primer; milling all surfaces of the work piece to desired dimensions; chamfering the edges on the work piece with various chamfering/milling cutters at desired angles forming the straight cutting edge; drilling plurality of holes on the straight cutting edge at desired locations; deburring of the plurality the holes and sharp edges of the straight cutting edge; coating the straight cutting edge with rust proof oil; slotting the pre-drilled holes to convert circular holes into square holes; counter boring the square holes up to a predefined depth; counter sinking the plurality of square holes; deburring of the plurality the holes and sharp edges of the straight cutting edge; coating the straight cutting edge with rust proof oil.
STATEMENT OF INVENTION
[0019] The present invention discloses a straight cutting edge for a motor grader blade assembly comprising a motor grader blade assembly; plurality of straight cutting edges configured of a high strength and abrasion resistant alloy steel constituted of 0.2% of carbon (C), 1.5% of manganese (Mn), 0.035% of sulphur (S), 0.035% of phosphorous (P), 0.045% of silicon (Si), 0,005-0.005% of vanadium (V), 0.1% titanium (Ti), zirconium (Zr) and iron (Fe) components to be mounted on the motor grader blade assembly; plurality of holes provided on the lower end of the motor grader blade assembly configured to mount the plurality of straight cutting edges; plurality of holes provided on an upper end of straight cutting edge configured for mounting the straight cutting edge on the motor grader blade assembly through fastening means.
[0020] The present invention also discloses a method to produce the straight cutting edge for the motor grader blade assembly comprising steps of flame cutting a work piece of desired dimension from the high strength and abrasion resistant material; grinding and deburring the said work piece; straightening and cleaning of the said work piece by shot blasting; coating the work piece with primer; milling all surfaces of the work piece to desired dimensions; chamfering the edges on the work piece with various chamfering/milling cutters at desired angles forming the straight cutting edge; drilling plurality of holes on the straight cutting edge at desired locations; deburring of the plurality the holes and sharp edges of the straight cutting edge coating the straight cutting edge with rust proof oil; slotting the pre-drilled holes to convert circular holes into square holes; counter boring the square holes up to a predefined depth; counter sinking the plurality of square holes; deburring of the plurality the holes and sharp edges of the straight cutting edge; coating the straight cutting edge with rust proof oil.

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The foregoing summary, as well as the following detailed description of embodiments, is better understood when read in conjunction with the appended drawings. For the purpose of illustrating the disclosure, there is shown in the present document example constructions of the disclosure. The detailed description is described with reference to the following accompanying figures.
[0022] Figure 1 illustrate a prior art related to a high wear-resistant grader blade with tungsten carbide insert.
[0023] Figure 2 illustrate a prior art related to a highly wear-resisting grader blade.
[0024] Figure 3 illustrates a motor grader mounted with a blade assembly in a preferred embodiment of the present invention.
[0025] Figure 4 illustrates an exploded view of the blade assembly for the motor grader blade assembly in a preferred embodiment of the present invention.
[0026] Figure 5 illustrates a detailed view of the straight cutting edge of the motor grader mounted with the straight cutting edge in a preferred embodiment of the present invention.
[0027] Figure 6 illustrates a flowchart describing a method to produce the straight cutting edge from an alloy steel in a preferred embodiment of the present invention.
[0028] The figure depicts various embodiments 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 OF INVENTION

[0029] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising", “having”, 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 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 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, devices and methods are now described. The disclosed embodiments are merely exemplary of the disclosure, which may be embodied in various forms.
[0030] 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.
[0031] A motor grader is a heavy self-propelled equipment with an adjustable blade between its front and rear axles. The primary function of the motor grader is to perform tasks as levelling surfaces, spreading and mixing of materials in construction sites and mines. A blade assembly of the motor grader performs blade lift, blade side shift and blade tilt operations with a lever in an operator’s compartment with the help of a hydraulic system.
[0032] The present subject matter discloses the design and development of a straight cutting edge for the motor grader blade assembly and method to produce thereof. The straight cutting edge is cost-effective with enhanced life due to the high strength and abrasion resistant steel grade material.
[0033] Now referring to figure 3, figure 3 shows a motor grader (100) mounted with a moldboard or a blade assembly (110). The blade assembly (110) of motor grader (100) is located between a front axle (102) and a rear axle (104) of the motor grader (100). The blade assembly (110) of the motor grader (100) performs operations like levelling, mixing and spreading of construction material. The blade assembly (110) executes operations like blade lift, blade side shift and blade tilt by a lever in an operator’s compartment. The movement of the blade assembly (110) is carried out by a hydraulic system. The blade assembly (110) is mounted on a drawbar assembly (108) in connection with the front axle (102) and operated by hydraulic cylinders (106).
[0034] Now referring to figure 4, figure 4 relates to an exploded view of the blade assembly (110). The blade assembly (110) is mounted with plurality of straight cutting edges (112) and end bits (113) at both lateral ends. A bottom end of the blade assembly (110) is provided with plurality of holes (123) for fastening the plurality of straight cutting edges (112) on the blade assembly (110) with fastening means as hardened washers (118), nuts (116) and bolts (114). A straight cutting edge (112) undergoes heavier loads and stresses. If the cutting edge of the blade assembly wears out or fails, the whole blade assembly (110) is not replaced. Instead, the straight cutting edge (112) is replaced with a new straight cutting edge (112). With the above-stated design of new straight cutting edge (112) made of the high strength and abrasion resistant alloy steel enhance life of the blade (110) and reduces overall cost.
[0035] To sustain stress and varying loads during operations as levelling, mixing and spreading; the blade assembly (110) needs to possess high strength and abrasion resistant. To reduce cost of the blade assembly (110), the straight cutting edge (112) is produced from the high strength and abrasion resistant alloy steel comprising 0.2% of carbon (C), 1.5% of manganese (Mn), 0.035% of sulphur (S), 0.035% of phosphorous (P), 0.045% of silicon (Si), 0,005-0.005% of vanadium (V), 0.1% titanium (Ti), zirconium (Zr) and iron (Fe). The high strength and abrasion resistant alloy steel possess ultimate tensile strength of 790 N/mm2, yield strength of 690 N/mm2 and elongation of 16% (on gauge length of 50mm). Further, the high strength and abrasion resistant alloy steel possesses an impact strength of 40J at -40°C and hardness between 240 to 300 BHN. The high strength and abrasion resistant alloy steel yields finer grain and martensite microstructure and avoids surface coating/treatment like ion implanting and carburization.
[0036] Now referring to figure 5, figure 5 shows a detailed view of the straight cutting edge (112) mounted on the blade assembly (110) of the motor grader (100). As per one of the embodiment, the straight cutting edge (112) is provided with plurality of square holes (124) for fastening to the blade assembly (110) with M24 bolts as shown in figure 5 (a) and figure 5 (c). Figure 5(a) shows a front view of the straight cutting edge (112) and figure 5(c) shows a sectional view of the straight cutting edge (112). As per one of the embodiment, the straight cutting edge (112) is made with a thickness of 25 mm, a length of 1219 mm and a height of 192 mm. The straight cutting edge (112) is made of a front surface (120), a rear surface (122), an upper surface (128) and a bottom surface (126) as shown in figure 5(b). However, the dimensions of the straight cutting edge (112) will vary as per requirement of the motor grader blade (110). Further, chamfered edges are provided on the straight cutting edge (112). A first chamfered edge (130) is provided between the rear surface (122) and the upper surface (128) at 5° and a second chamfered edges (132) is provided between the rear surface (122) and the upper surface (128) at 5° and 30° for mounting the straight cutting edge (112) on the blade assembly (110). A third chamfered edge (134) is provided at a propulsion angle of 37° between the rear surface (122) and the bottom surface (126) of the straight cutting edge (112), which helps to prevent the tangential load come on the straight cutting edge (112). The propulsion angle increases the life of the straight cutting edge (112). The straight cutting edge (112) is provided with the square holes (124) at 9 places along the length of the straight cutting edge (112). Square holes (124) are inclined at 8° to the front surface (120) for mounting the straight cutting edge (112) on the blade assembly (110).
[0037] Referring to figure 6, figure 6 discloses a method (200) for manufacturing the straight cutting edge (112) from the high strength and abrasion resistant alloy steel by following machining processes. Initially at step 202, the high strength and abrasion resistant alloy steel is cut by flame cutting to desired dimension of a work piece. Further, the work piece undergoes grinding followed by deburring to remove uneven and sharp edges of the work piece, at step 204. In next step 206, the waviness, bends and twists in the work piece are removed by straightening. The straightening also maintains the desired flatness of the work piece. The flatness is maintained within 1mm. Further, the work piece is cleaned by shot blasting. The shot blasting is a surface treatment process involves cleaning of metal surface to remove rust, debris & other irregularities from the work piece. In next step 208, two coats of blue/ black primer are applied to the work piece for achieving desired dry film thickness (DFT). In next step 210, milling all surfaces of the work piece to desired dimensions. Further in step 212, chamfering the edges (130, 132, 134) on the work piece with various chamfering/milling cutters at desired angles forming the straight cutting edge (112). In next step 212, drilling plurality of holes on the straight cutting edge (112) at desired locations by clamping the straight cutting edge (112) at 8° using an angle plate. In next step 214, deburring of the plurality the holes and sharp edges of the straight cutting edge (112). In next step 216, coating the straight cutting edge (112) with rust proof oil. Further in step 218, slotting the plurality of pre-drilled holes to convert circular holes into square holes (124). In next step 220, counter boring the plurality of square holes (124) up to a predefined depth. In next step 222, counter sinking the plurality of square holes (124). In next step 224, deburring of the plurality the square holes (124) and sharp edges of the straight cutting edge (112). At step 226, coating the straight cutting edge (112) with rust proof oil.
[0038] As per one of the embodiment, the straight edge cutting edge (112) is produced by the following method (200), the high strength and abrasion resistant alloy steel is flame cut to a dimension of 200mm x 1225 mm of the work piece, which is further grinded and deburred. Further, straightening is performed to maintain the flatness within 1mm. The work piece is cleaned by shot blasting. The shot blasting achieves a cleaning standard of SA 2.5 (SSPC SP10) according to international standard ISO 8501-1. The primer is applied to the work piece for maintaining DFT in range of 60-80 microns. Further, milling of all surface of the work piece to dimension of 192mm x 1219mm x 25mm by milling cutter. The flatness is maintained within 0.4 mm and perpendicular within 1mm. Further, chamfering the edges (130, 132, 134) on the work piece with various chamfering/milling cutters at desired angles forming the straight cutting edge (112). The chamfering cutters used are 37° milling cutter, 30° milling cutter and 5° milling cutter to form the straight cutting edge (112). The square holes (124) are drilled at 9 locations along the length of the straight cutting edge (112) with a 19 mm drill bit by clamping the straight cutting edge (112) at 8° using an angle plate. Further, the drilled holes and all edges of the straight cutting edge (112) are deburred with deburring tools. After drilling and deburring, a rust proof oil is applied on all machined areas. Slotting operation is performed on pre-drilled holes to convert circular holes into square holes (124). Counter boring is performed on the front surface (120) up to a depth of 9 mm with counter boring tool at an angle of 8° followed by counter sinking. Further, the straight cutting edge (112) is deburred with deburring tools. After deburring, a rust proof oil is applied on all machined areas. However, the dimensions of the straight cutting edge (112) and the inclination angle of square hole will vary as per requirement of the motor grader blade assembly (110). Further, the DFT value of the primer will vary as per requirement of the motor grader blade assembly (110).
[0039] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include the following.
[0040] The present invention discloses a straight cutting edge (112) for a motor grader blade assembly (110) comprising a motor grader blade assembly (110); plurality of straight cutting edges (112) configured of a high strength and abrasion resistant alloy steel constituted of 0.2% of carbon (C), 1.5% of manganese (Mn), 0.035% of sulphur (S), 0.035% of phosphorous (P), 0.045% of silicon (Si), 0,005-0.005% of vanadium (V), 0.1% titanium (Ti), zirconium (Zr) and iron (Fe) components to be mounted on the motor grader blade assembly (110); plurality of holes (123) provided on the lower end of the motor grader blade assembly(110) configured to mount the plurality of straight cutting edges (112); plurality of holes (124) provided on an upper end of straight cutting edges (112) configured for mounting the straight cutting edge (112) on the motor grader blade assembly (110) through fastening means.
[0041] The present invention also discloses the straight cutting-edge (112) is configured of a front surface (120), a bottom surface (126), an upper surface (128) and a rear surface (122). A first chamfered edge (130) is configured to be machined at 5° between the upper surface (128) and the rear surface (122) for mounting the straight cutting edge (112) on the motor grader blade assembly (110). A second chamfered edge (132) is configured to be machined at 30° between the upper surface (128) and the rear surface (122) for mounting the straight cutting edge (112) on the motor grader blade assembly (110). A third chamfered edge (134) is configured to be machined at a propulsion angle of 37° between the bottom surface (126) and the rear surface (122). The fastening means are configured of hardened washers (118), nuts (116) and bolts (114). The straight cutting edge (112) is configured with ultimate tensile strength of 790 N/mm2, yield strength of 690 N/mm2, elongation of 16% (on gauge length of 50mm), an impact strength of 40J at -40°C and hardness between 240 to 300 BHN.
[0042] The present invention also discloses a method (200) to produce the straight cutting edge (112) for the motor grader blade assembly (110) comprising steps of flame cutting a work piece of desired dimension from the high strength and abrasion resistant material; grinding and deburring the said work piece; straightening and cleaning of the said work piece by shot blasting; coating the work piece with primer; milling all surfaces of the work piece to desired dimensions; chamfering the edges (130, 132, 134) on the work piece with various chamfering/milling cutters at desired angles forming the straight cutting edge (112); drilling plurality of holes on the straight cutting edge (112) at desired locations; deburring of the plurality the holes and sharp edges of the straight cutting edge (112); coating the straight cutting edge (112) with rust proof oil; slotting the pre-drilled holes to convert circular holes into square holes (124); counter boring the square holes (124) up to a predefined depth; counter sinking the plurality of square holes (124); deburring of the plurality the holes and sharp edges of the straight cutting edge (112); coating the straight cutting edge (112) with rust proof oil.
[0043] The present invention also discloses the shot blasting is configured to achieve a cleaning standard of SA 2.5 (SSPC SP10). The primer is configured to produce dry film thickness (DFT) of 60-80 microns.
[0044] Some embodiments of the present subject matter is to provide a straight cutting edge design for a motor grader blade assembly.
[0045] Some embodiments of the present subject matter is to provide the straight cutting edge design for motor grader blade assembly made of high strength and abrasion resistant alloy steel.
[0046] Some embodiments of the present subject matter are to provide the straight cutting edge made of alloy steel with finer grain and martensite microstructure.
[0047] Some embodiments of the present subject matter is to provide the straight cutting edge to work with a balance of precision, speed and material removal.
[0048] Some embodiments of the present subject matter is to provide a minimum blade angle of the straight cutting edge to effectively perform operations like levelling, spreading and mixing for the motor grader applications.
[0049] Some embodiments of the present subject matter is to provide the straight cutting edge made up of locally available material with minimized cost.
[0050] Although implementations for the specified the straight cutting edge for motor grader blade assembly and method to produce thereof, in language specific to structural features and/or system, it is to be understood that the appended claims are not necessarily limited to the specific features or described. Rather, the specific features are disclosed as examples of implementations.
[0051] Following is a list of elements and reference numerals used to explain various embodiments of the present subject matter.
Reference Numeral Component Description
100 Motor Grader
102 Front Axle
104 Rear Axle
106 Hydraulic Cylinder
108 Drawbar Assembly
110 Blade assembly
112 Straight Cutting Edge
113 End Bit
114 Bolt
116 Nuts
118 Hardened Washer
120 Front Surface
122 Rear Surface
123 Plurality of Holes
124 Plurality of Holes
126 Bottom Surface
128 Upper Surface
130 First Chamfer Edge
132 Second Chamfer Edge
134 Third Chamfer Edge
Equivalents
[0052] With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
[0053] 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 particular 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."
[0054] Although implementations for a straight cutting edge for motor grader blade assembly and method to produce thereof have been described in language specific to structural features and/or methods, it is to be understood that the appended claims are not necessarily limited to the specific features described. Rather, the specific features are disclosed as examples of implementation for the straight cutting edge for motor grader blade assembly and method to produce thereof.

,CLAIMS:
1. A straight cutting edge (112) for a motor grader blade assembly (110) comprising:
a motor grader blade assembly (110);
plurality of straight cutting edges (112) configured of a high strength and abrasion resistant alloy steel constituted of 0.2% of carbon (C), 1.5% of manganese (Mn), 0.035% of sulphur (S), 0.035% of phosphorous (P), 0.045% of silicon (Si), 0,005-0.005% of vanadium (V), 0.1% titanium (Ti), zirconium (Zr) and iron (Fe) components, to be mounted on the motor grader blade assembly (110);
plurality of holes (123) provided on the lower end of the motor grader blade assembly(110) configured to mount the plurality of straight cutting edges (112);
plurality of holes (124) provided on an upper end of straight cutting edges (112) configured for mounting the straight cutting edge (112) on the motor grader blade assembly (110) through fastening means.

2. The straight cutting edge (112) for the motor grader blade assembly (110) as claimed in claim 1, wherein the straight cutting-edge (112) is configured of a front surface (120), a bottom surface (126), an upper surface (128) and a rear surface (122).

3. The straight cutting edge (112) for the motor grader blade assembly (110) as claimed in claim 2, wherein a first chamfered edge (130) is configured to be machined at 5° between the upper surface (128) and the rear surface (122) for mounting the straight cutting edge (112) on the motor grader blade assembly (110).

4. The straight cutting edge (112) for the motor grader blade assembly (110) as claimed in claim 2, wherein a second chamfered edge (132) is configured to be machined at 30° between the upper surface (128) and the rear surface (122) for mounting the straight cutting edge (112) on the motor grader blade assembly (110).

5. The straight cutting edge (112) for the motor grader blade assembly (110) as claimed in claim 2, wherein a third chamfered edge (134) is configured to be machined at a propulsion angle of 37° between the bottom surface (126) and the rear surface (122).

6. The straight cutting edge (112) for the motor grader blade assembly (110) as claimed in claim 1, wherein the fastening means are configured of hardened washers (118), nuts (116) and bolts (114).

7. The straight cutting edge (112) for the motor grader blade assembly (110) as claimed in claim 1, wherein the straight cutting edge (112) is configured with ultimate tensile strength of 790 N/mm2, yield strength of 690 N/mm2, elongation of 16% (on gauge length of 50mm), an impact strength of 40J at -40°C and hardness between 240 to 300 BHN.

8. A method (200) to produce the straight cutting edge (112) for the motor grader blade assembly (110) comprising steps of:
? flame cutting a work piece of desired dimension from the high strength and abrasion resistant material;
? grinding and deburring the said work piece;
? straightening and cleaning of the said work piece by shot blasting;
? coating the work piece with primer;
? milling all surfaces of the work piece to desired dimensions;
? chamfering the edges (130, 132, 134) on the work piece with various chamfering/milling cutters at desired angles forming the straight cutting edge (112);
? drilling plurality of holes on the straight cutting edge (112) at desired locations;
? deburring of the plurality the holes and sharp edges of the straight cutting edge (112);
? coating the straight cutting edge (112) with rust proof oil;
? slotting the pre-drilled holes to convert circular holes into square holes (124);
? counter boring the square holes (124) up to a predefined depth;
? counter sinking the plurality of square holes (124);
? deburring of the plurality the holes and sharp edges of the straight cutting edge (112);
? coating the straight cutting edge (112) with rust proof oil.

9. The method (200) to produce the straight cutting edge (112) for the motor grader blade assembly (110) as claimed in claim 8, wherein the shot blasting is configured to achieve a cleaning standard of SA 2.5 (SSPC SP10).

10. The method (200) to produce the straight cutting edge (112) for the motor grader blade assembly (110) as claimed in claim 8, wherein the primer is configured to produce dry film thickness (DFT) of 60-80 microns.