WO2014076710A1

WO2014076710A1 - Multi cutting edge deburring blade/tools

Info

Publication number: WO2014076710A1
Application number: PCT/IN2013/000466
Authority: WO
Inventors: Chetan Prabhakar PURAV
Original assignee: Purav Chetan Prabhakar
Priority date: 2012-11-19
Filing date: 2013-07-26
Publication date: 2014-05-22
Also published as: AU2016101408A4

Abstract

The present invention relates to a multi cutting edge deburring blade/tool which has multiple segments of cutting edges giving more than one effective cutting edge portion in this blade/tool. In this invention, a single blade can have different geometric shapes of the cutting edge portions on the sanie blade enabling deburring of different types of metal applications from different cutting edge portions of the same blade. This new blade/tool can be made of cutting tool materials like HSS, carbide, ceramic and others. The total life of this blade/tool is the sum total of the life from each segment of the cutting edge thus making it extremely cost effective.

Description

TITLE OF THE INVENTION : Multi Cutting Edge Deburring Blade/Tools.

PREAMBLE OF INVENTION: This invention in particular describes the nature of the invention and the manner in which it is to be performed.

FIELD OF THE INVENTION: The present invention relates to deburring blade/tools which have multiple segmented cutting edge design.

BACKGROUND OF THE INVENTION INCLUDING PRIOR ART

A burr is a raised edge or unwanted pieces of material remaining attached to a workpiece after a modification process. Burrs are most commonly created on a material after machining operations, such as grinding, drilling, milling, engraving or turning. Burrs are often not acceptable, usually for safety reasons, either for handling or for product safety.

Deburring is the process by which this" unwanted piece of material is removed with the help of a deburring tool. Deburring Can also be called a finishing process in which burrs and sharp edges are removed from metals, plastics and other work piece material. There are many deburring processes, but the most common are mass-finishing, media blasting, sanding, grinding, wire brushing, abrasive flow machining, electrochemical deburring, electro-polishing, thermal energy method, machining, and manual deburring etc. Manual deburring is the most common deburring process, because it is the most flexible process. It requires low cost tools and allows for instant inspection.

US Patent 3742805 describes a self-contained, multi-blade package adapted to be mounted in the blade head assembly of a wafering machine comprises a plurality of substantially coextensive elongated thin flat strip blades having aligned holes in the opposite end portions thereof with spacer plates between the end portions of the blades and having holes aligned with the blade holes, and the assembly connected together by rods extending through the aligned holes and having means at the opposite ends of the rods to retain the blades and spacers assembled on the rods so that the assembly can be handled as a self-contained package for placement in and removal from the blade head assembly.

US Patent 7238096 discusses an orbital rotary blade sharpener for sharpening rotary cutter blades and other rotary blades includes a bottom blade holding portion having a center and a perimeter edge, a top blade holding portion rotatably connectable to. saiid bottom blade holding portion, having a perimeter and a center, a central shaft portion extending from said bottom blade holding portion through said top blade holding portion over which a rotary blade can be fitted, a radial shaft portion extending through said top blade holding portion positioned between the perimeter and the center of the top blade holding portion, and grinding portion connected to said radial shaft portion, and within said top blade holding portion, positioned to be orbitally revolvable around said bottom blade holding portion center and contactable with a blade held between said top and bottom blade holding portions.

US Patent 6904635 gives a saw-mounted deburring product which, in use, is mounted to. a saw with an orientation that allows deburring after cutting without reorientation of the saw, where the deburring implement can have an internal deburring component and an outer deburring component, and where the deburring implement can be mounted to a mounting fixture that is mounted to the saw.

US Patent 7517275 provides an apparatus for precision steeling/conditioning of knife edges which has a multi- stage sharpener which includes at least one motor driven abrasive sharpening stage and one non-motor driven conditioning stage. The conditioning stage has a non-abrasive hardened surface and at least one precision knife guide which has a planar guide surface for creating a microscopic serration along the edge of a blade which had been sharpened in the first stage sharpening station. The sharpener may also include a third stage motor driven finishing stage. Alternatively, the conditioning stage can be incorporated as the knife edge modifying stage of a manual sharpener.

US Patent 4777725 describes an invention which relates to a blade-holder capable of holding two different deburring blades and a deburring tool utilizing the blade-holder. The blade-holder comprises of a rod, two longitudinal bores, one at each end of the rod and releasable locking means situated in the regions of the longitudinal bores. US Patent 5135338 discusses a deburring tool with tilt blade for deburring bore edges whereby the tilt blade swings into the tool holder in a vertical direction when travelling through the bore. It features a locking device designed as bar spring which engages in a curve like recess at the outer periphery of the deburring blade or blade holder, whereby the deburring blade holder are arranged on a tilt bolt on the basic body.

US Patent 4860453 relates to deburring tool that is provided having two sets of blades for use in simultaneously deburring the inner and outer edges of a piece of tubing, further including adjustment capability allowing the use of the tool in deburring tubing of different sizes, further including a cap recess cleaning tool, a cleaning brush and a base for mounting the deburring tool on a bench, table or the like.

US Patent 7062858 gives a hand tool for deburring, as well as a cutting blade to be inserted into the tool, the tool comprising a housing, and a rotatable holding device, the holding device being positioned in and being rotatable in the housing and having a chamber for releasably holding a cutting blade, the chamber running obliquely to the axis of rotation (z) of the holding device. US Patent 7524149 relates to a tool for countersinking, deburring and spindling out holes, consisting of a blade holder driven rotationally about its longitudinal axis, in which, at an angle to its longitudinal axis, at least one recess is arranged, in which one or more cutting blades or their holders are held as exchangeably and/or displaceably load-transmitting. In order to guarantee better protection against tilting and breaking of the cutting blade out of the recess in the blade holder it is provided that the recess is formed from radii substantially blending into one another. US Patent Application 20070054604 relates to an orbital rotary blade sharpener for sharpening rotary cutter blades and other rotary blades includes a bottom blade holding portion having a center and a perimeter edge, a top blade holding portion rotatably connectable to said bottom blade holding portion, having a perimeter and a center, a central shaft portion extending from said bottom blade holding portion through said top blade holding portion over which a rotary blade can be> fitted, a radial shaft portion extending through said top blade holding portion positioned between the perimeter and the center of the top blade holding portion, and grinding portion connected to said radial shaft portion, and within said top blade holding portion, positioned to be orbitally revolvable around

( said bottom blade holding portion center and contactable with a blade held between said top and bottom blade holding portions.

US Patent Application 20110100178 describes a deburring system, deburring apparatus and cutter blade for enabling perfect automation of deburring with which burr of a resin molded article is substantially perfectly removed after the resin molded article is manufactured at low cost not by using an expensive resin molding machine, but by using a conventional general-purpose molding machine. Furthermore, there are provided a deburring apparatus and a cutter blade with which burr of a resin molded article having an unstable shape can be easily and cleanly removed from the root thereof without using any expensive control device and any positioning device and also without using any expensive copying device. - WIPO Patent Application WO 2011104720· discusses an insert type hand deburring blade/tool in which a crank-shaped deburring cutting holder is provided having a cutting edge insert being easily mounted on the holder and an arrangement provided at the front of the holder thereby providing of a circular movement of the cutting edge insert while deburring metal and plastic uniformly with high efficiency. In some embodiments of the invention, the cutting edge insert (a) can be set in different positions in order to bring forth a desired cutting edge, (b) can easily be replaced on the holder, (c) comprises at least one cutting edge having at least one insert profile and at least one cutting angle, (d) can be mounted one behind another insert on the holder thereby allowing possibility of deburring two different types of metal and plastic materials and (e) has different geometric shape of cutting angles thereby allowing the insert to cover deburring application on many types of metal and plastic materials. EP 0510298 gives a knife, especially a deburring knife for plastic components has a knife blade (11) which projects at the front from a front handle region (11). The front handle region (11) serves for gripping between thumb and finger, in particular tip-gripping between thumb and forefinger. Adjoining the front handle region (11), remote from the knife blade, is a rear handle region (12) for gripping between the ball of the thumb and the remaining fingers, in particular between the ball of the thumb and the little finger. An economically favourable hand design which counteracts fatigue in the user's hand is achieved by the knife handle (18) being designed in two parts, in that the rear handle region (12) consists of a transition handle region (19), adjoining the front handle region (11), and of a separate telescopically connected handle end region (20) which is axially displaceable and adjustably lockable with respect to the transition handle region.

Although a wide variety of hand deburring tools or blades are available in the prior art, they usually have a single cutting edge in a straight line. Moreover their effective cutting edge portion is very small in length which gets worn out easily leading to frequent need for replacement of blade. So blades having multiple sections / segments of cutting edges which can be used for deburring different types of material application from different cutting edge portions of the same blade thus increasing the life of the blade/tool is the need of the day.

OBJECT OF THE INVENTION:

The main object of the invention is to provide for a multi cutting edge deburring blade/tool which has two or more segments of cutting edge design.

Another object pf the invention is to provide for a multi cutting edge deburring blade/tool in which a single blade can have different included angles or geometric shapes between the two cutting edge surfaces of the different cutting edge segments of the same blade. Still another object of the invention is to provide for a multi cutting edge deburring blade/tool which is made of different types of cutting tool materials such as High Speed Steel, carbide, ceramic and others.

Yet another object of the present invention is to provide for a multi cutting edge deburring blade/tool which has a total life equivalent to the sum total of the life from each segment of the cutting blade.

A further object of the present invention is to provide for a multi cutting edge deburring blade/tool which is extremely cost effective.

SUMMARY OF THE INVENTION:

The present invention is a multi cutting edge deburring blade/tool which has multiple segments of cutting edge along the total length of the cutting edge. Each segment of this cutting edge becomes effective¹ cutting edge portion. As the angles between cutting edge, surfaces may be same or different a single blade can have different geometric shapes of the cutting edge portions of the same blade. This allows possibility of deburring different types of material applications from different cutting edge portions of the same blade. The new deburring blade/tool can be made of different types of cutting tool materials like HSS, carbide, ceramic and others depending on its use. As there are multiple segments of cutting edges, the total life of this blade/tool will be the sum total of the life of each of the segments thus increasing the life of the blade/tool. This way the present invention proves to be extremely cost effective.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1. shows sketch of the Existing Deburring Blade.

Fig. 2. shows sketch of the present invention - New Multi Cutting Edge Deburring Blade and its multiple cutting edge segments.

Fig. 3. shows sketch of the present invention - New Multi Cutting Edge Deburring

Blade - its Effective cutting edge portions and Guide sections.

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Fig. 4. shows sketch of the present invention - New Multi Cutting Edge Deburring Blade - its Cutting Edge Surface, Included angle / Geometric shapes of two cutting edge segments.

DETAILED DESCRIPTION:

The nature of the invention and the manner in which it is performed is clearly described in the specification. The invention has various components and they are clearly described in the detailed description.

Deburring Tools based on Swivel Blade design have been in existence since over 40 years. These types of tools/blades are one piece construction normally made out of cutting tool material such as High Speed Steel (HSS). They are made by bending the tool blank in a crank shape, heat-treating them and then grinding them in different profiles. Usually these tools are made in 2.6, 3.17 and 6 mm diameter. All these deburring blades are one piece construction having a single cutting edge in a straight line. They have a groove design on one end due to which they can be held in the handle such that they cannot be pulled out but are still free to rotate around the axis of the handle. Due to this rotational / swivel property, these deburring blades work effectively for deburring of holes, straight edges and inner curves of various metals and plastics. The cutting edge length in these crank shaped deburring blades varies between 8 mm in a 2.6 mm diameter blade to upto 25 mm in a 6 mm diameter blade. However in such blades the effective cutting edge length from where these blades can be efficiently used is only between 2 to 3 mm. Once this effective cutting edge portion gets worn,out i.e. becomes blunt or dull, the blade needs to be replaced.

The present invention is a multi cutting edge deburring blade/tool which has segmented cutting edge design. Due to this there are two or more segments of cutting edge along the total length of the cutting edge. Each segment of this cutting edge becomes an effective cutting edge portion. So as there are multiple segments of cutting edge, there are more than one effective cutting edge portion in this blade. This way, instead of the conventional single cutting edge, this tool/blade has multiple cutting edges. Each of these multiple cutting edges is an effective cutting edge portion and so this tool/blade can be used from each of the effective cutting edges.

At the end of each cutting edge segment, there is a guide section on either one or two sides of the cutting edge surface. The guide section could be in 'V shape or in combination of straight & radius. The included angle (geometric shapes) between two cutting edge surfaces can be same or different between the various cutting edge segments. Thus a single blade can have different geometric shapes of the cutting edge portions of the same blade. This too enables the deburring of different types of material applications from different cutting edge portions of the same blade.

The present invention which is a new deburring blade/tool can be made from different types of cutting tool materials such as HSS (High Speed Steel), carbide, ceramic and others. As this blade/tool has multiple segments of cutting edges, it doesn't get worn out soon like the conventional deburring blades/tools. Instead the total life of this blade/tool is the sum total of the life from each segment of the cutting edge. So due to the presence of multiple segments of cutting edges, this tool is extremely cost effective in comparison to the existing single cutting edge deburring blades/tools.

The present invention is user friendly and can be used in any of the existing handles holding the deburring blades. These handles can usually take either 2.6 mm or 3.17 mm or 6 mm size of blades. The invented blade/tool being of the same size can be used in these handles.

Fig. 2 clearly shows the multiple effective cutting edge segments in the present invention.

Fig. 3 clearly shows the multiple effective cutting edge portions and Guide sections in comparison with the single effective cutting edge portion in the conventional deburring blades/tools as shown in Fig.1. Fig. 4 clearly shows different included angles / geometric shapes between cutting surface of two cutting edge segments

A single included angle is found in the existing deburring blades/tools while the present invention has multiple included angles which may be different from each other and so enables the deburring of different types of material applications from different cutting edge portions of the same blade. This way the present invention is very advantageous.

Although the preferred embodiment as well as the method and use have been specifically described, it should be understood that variations in the preferred embodiment could be achieved by a person skilled in the art without departing from the spirit of the invention. The invention has been described with reference to specific embodiment which is merely illustrative and not intended to limit the scope of the invention as defined in the claims.

Claims

CLAIMS : I claim,

1. A multi cutting edge deburring blade/tool comprises multiple segments of cutting edges giving more than one effective cutting edge in the blade/tool.

2. The multi cutting edge deburring blade/tool as claimed in claim 1 wherein the included angle between two cutting edge surfaces can be same or different between the various cutting edge segments thereby providing different geometric shapes of the cutting edge portions in the same blade/tool.

3. The multi cutting edge deburring blade/tool as claimed in claim 1 wherein at the end of each cutting edge segment, there is a guide section on either one Or two sides of the cutting edge surface.

4. The multi cutting edge deburring blade/tool as claimed in claim 3 wherein the guide section could be in 'V shape or in combination of straight & radius.

5. The multi cutting edge deburring blade/tool as claimed in claim 2 wherein different cutting edge portions on the same blade/tool enables deburring of different types of material applications.

6. The multi cutting edge deburring blade/tool as claimed in claim 1 wherein the deburring blade/tool can be made frorn idifferent types of cutting tool materials like High Speed Steel, Carbide, Ceramic and others.

7. The multi cutting edge deburring blade/tool as claimed in claim 1 wherein the total life of this deburring blade/tool is the sum total of the life from each segment of the cutting edge.

8. The multi cutting edge deburring blade/tool as claimed in claim 1 wherein the blade/tool is user-friendly and can be used in any of the existing handles holding the deburring blades as these blades are available in either 2.6 mm or 3.17 mm or 6 mm size which is also the size of the conventional blades/tools.

9. The multi cutting edge deburring blade/tool substantially herein described with reference to the foregoing description and drawings.