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EP1866114A2 - Endmills and method of making the same - Google Patents

Endmills and method of making the same

Info

Publication number
EP1866114A2
EP1866114A2 EP06749067A EP06749067A EP1866114A2 EP 1866114 A2 EP1866114 A2 EP 1866114A2 EP 06749067 A EP06749067 A EP 06749067A EP 06749067 A EP06749067 A EP 06749067A EP 1866114 A2 EP1866114 A2 EP 1866114A2
Authority
EP
European Patent Office
Prior art keywords
blank
inches
recited
heater
length
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06749067A
Other languages
German (de)
French (fr)
Inventor
David Denboer
Matt Collier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Smith International Inc
Original Assignee
Smith International Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Smith International Inc filed Critical Smith International Inc
Publication of EP1866114A2 publication Critical patent/EP1866114A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B22F3/14—Both compacting and sintering simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23C2222/28—Details of hard metal, i.e. cemented carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2226/00—Materials of tools or workpieces not comprising a metal
    • B23C2226/12—Boron nitride
    • B23C2226/125—Boron nitride cubic [CBN]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2226/00—Materials of tools or workpieces not comprising a metal
    • B23C2226/31—Diamond
    • B23C2226/315—Diamond polycrystalline [PCD]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1946—Face or end mill
    • Y10T407/1948—Face or end mill with cutting edge entirely across end of tool [e.g., router bit, end mill, etc.]

Definitions

  • An endmill typically is used for machining a surface, edges, grooves, pockets and slots. It can be made of high speed steel, or solid cemented carbide, but it can also consist of a steel tool body with cemented carbide inserts as cutting means.
  • endmills having cutting edges formed of a superhard material, such as PCD are usually used for the machining of non-ferrous alloys such as aluminum, brass, magnesium, composites, and the like, whereas endmills with cutting edges formed of a superhard abrasive, such as PcBN, are usually used for the machining of ferrous materials such as cast iron and hardened steel and the like.
  • One method of making an endmill includes sintering at high temperature and high pressure (HPHT) diamond or cBN powder into veins in a solid cylindrical carbide body, i.e., a blank which is then brazed onto a shank and finished into an endmill.
  • HPHT high temperature and high pressure
  • the shank is attached to the endmill blank via brazing or other methods forming a joint, it results in tool with an inherent weakness at the joint.
  • End milling applications under normal conditions exert a complex tensile and shear loads on the endmill that can lead to failure of the endmill at the joint. Consequently, an endmill is desired that does not have this inherent weakness.
  • a method for forming such an endmill is also desired.
  • a method is provided allowing for the formation of an ultra hard material, such as a polycrystalline diamond (PCD) or polycrystalline cubic boron nitride (PCBN), endmill from a single solid blank without requiring brazing of the blank onto a shank.
  • the method provides for the formation of endmills from blanks having a length of at least 1.6 inches.
  • the method provides for the formation of endmills from blanks having a length of at least 1.7 inches.
  • the method provides for the formation of endmills from blanks having a length of at least 1.75 inches.
  • the method provides for the formation of endmills from blanks having a length not less than 2 inches, hi yet a further exemplary embodiment, the method provides for using longer enclosures in a conventional sintering press, such as a belt press or a piston-cylinder press, hi one exemplary embodiment, the method allows for the use of longer sintering enclosures and longer heaters which do not incorporate end heating units by alleviating the use of end heaters. hi another exemplary embodiment a method for forming an endmill having polycrystalline ultra hard material is provided.
  • the method includes providing a blank having a groove, placing an ultra hard material in the groove, placing the blank in a refractory metal enclosure, placing the enclosure in a heater which has a length greater than 1.6 inches, and pressing the heater with the enclosure and blank in a press while heating using the heater for sintering the ultra hard material in the groove forming an polycrystalline ultra hard material.
  • the heater has a length of about 2.5 inches.
  • the blank has a length of at least 1.6 inches.
  • the heater has a length greater than 1.7 inches and the blank has a length greater 1.7 inches.
  • the heater has a length greater than 1.75 inches and the blank has a length greater 1.75 inches.
  • the heater has a length of about 2 inches and the blank has a length not less than 2 inches.
  • a method for forming an end mill having polycrystalline ultra hard material.
  • the method includes providing a blank having a length greater than 1.6 inches and a groove, placing an ultra hard material in the groove, placing the blank in a refractory metal enclosure, placing the enclosure in a heater, and pressing the heater with the enclosures and blank in a press while heating using the heater for sintering the ultra hard material in the groove forming a polycrystalline ultra hard material in the groove.
  • the blank may have a length greater than 1.7 inches.
  • the blank may have a length greater than 1.75 inches.
  • the blank may have a length of about 2 inches.
  • the blank may be provided in solid or in powder form. Furthermore either of the aforementioned exemplary embodiment methods may include machining the blank to form a flute having a cutting edge defined by the polycrystalline ultra hard material.
  • the heater does not include end heating units at opposite ends thereof.
  • the presses used may in an exemplary embodiment be a belt press or a piston-cylinder press.
  • an endmill having a body having a length of at least 1.6 inches including a grip portion and being formed from a single piece of material.
  • Polycrystalline ultra hard material is bonded to the body.
  • the body has a length of at least 1.7 inches.
  • the body has a length of at least 1.75 inches.
  • the body has a length of not less than 2 inches.
  • the polycrystalline ultra hard material does not extend to the grip portion.
  • FIG. 1 is a side view of a conventional endmill blank having veins of sintered ultra hard material.
  • FIG. 2 is a side view of a conventional endmill blank brazed onto a shank.
  • FIG. 3 is a perspective view of a conventional endmill blank finished into an endmill.
  • FIG. 4 is a partial cross-sectional view of a conventional heater for use in a sintering process.
  • FIG. 5 is a cross-sectional view of an exemplary embodiment longer heater for use in an exemplary embodiment sintering process.
  • FIG. 6 is a side view of an exemplary embodiment endmill blank of the present invention.
  • PCD polycrystalline diamond
  • HPHT high temperature and high pressure
  • Exemplary endmills and methods of making the same are described in U.S. Patent Nos. 4,991,467; 5,031,484; 5,115,697; and 5,685,671, the contents of which are fully incorporated herein by reference.
  • An endmill is typically formed from a cylindrical tungsten carbide blank 10 having helical grooves or veins 12 formed longitudinally on its outer surface, as for example shown in FIG. 1, which are packed with either diamond or cubic boron nitride and a binder.
  • the blank with the packed grooves is then HPHT sintered in a refractory metal enclosure, typically referred to as a "can", such as a can made of Niobium or Tantalum.
  • the sintering takes place in a press such as a cubic press.
  • the diamond or cBN form polycrystalline diamond (PCD) or polycrystalline cubic boron nitride (PcBN), respectively and simultaneously bond to the tungsten carbide blank.
  • PCD polycrystalline diamond
  • PcBN polycrystalline cubic boron nitride
  • the length the of the blank is very short, typically less than 1.5 inch.
  • the blank is brazed onto a shank 16 as for example shown in FIG. 2.
  • the blank with the polycrystalline ultra hard material and shank combination is then machined to form flutes 15 thereby forming the endmill having ultra hard material cutting edges 17 as for example shown in FIG. 3.
  • the blank with grooves packed with diamond or cubic boron nitride is placed in a refractory metal enclosure 11 which is then surrounded by salt 13 and placed in a cylindrical heater 20.
  • Current rings (not shown) and end disks 26 are coupled to the heater which provide current to the heater which in turn heats the enclosure with the blank by resistive heating.
  • the resistive heating is radial heating (as shown by arrows 22 in FIG. 4) through the circumferential outer surface of the heater, when the enclosure is supplied with current through current rings (not shown).
  • the end disks provide for axial heating as shown by arrows 24.
  • the end disks 26 are typically resistive type of heaters.
  • the heater with the enclosure is then placed within the press workspace where it is subjected to pressure.
  • the temperature provided by the heater and the pressure provided by the press for sintering are at levels where diamond and CBN are thermodynamically stable.
  • a typical cubic press typically has a working space having a length of 2.5 inches and can accommodate a conventional heater which has a length of about 1.60 inches, along with two end disks 26.
  • a conventional refractory metal enclosure has a length of about 1.50 inches. The entire heater length is taken up by the refractory metal enclosure and the salt. Consequently, the length of endmill blanks produced by conventional cubic sintering presses and heaters are limited to a length of about 1.50 inches.
  • a blank 40 such as a cylindrical tungsten carbide substrate is provided with longitudinally extending helical grooves 42 which are packed with the appropriate powder, e.g., diamond or cBN powder.
  • the blank with grooves may be formed using any known method.
  • the cylindrical blank may be formed using conventional methods and then machined to form the grooves.
  • the blank may be molded with the grooves in place, hi another exemplary embodiment, the blank may be provided is powder form such that it is solidified during the sintering process.
  • the blank may be provided in a powder form bound together with a binder.
  • the helical grooves 42 do not extend along the entire length 44 of the blank body 40.
  • the blank when the blank is formed, it is formed with a portion 46 not having any ultra hard material.
  • the blank portion including the ultra hard material is then machined to the appropriate shape without being brazed to a shank. Consequently, an endmill is formed where the portion 46 defines a grip portion.
  • the grip portion is used to mount the endmill in different apparatuses, such as machine collets or holding apparatuses.
  • the end portion of the endmill may be shrink fitted in a shrink fit holder which is then mounted onto a tool used for endmilling purposes.
  • a longer blank is formed having longitudinal helical grooves extending along the entire length of the blank, m yet a further exemplary embodiment, the blanks may be formed with only a single groove for receiving the appropriate ultra hard material.
  • an endmill blank is formed having a length greater than 1.75 inches.
  • an endmill blank is formed having a length greater than 1.7 inches and up to 2 inches.
  • an endmill blank is formed which has a length of at least 2 inches.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Milling Processes (AREA)
  • Drilling Tools (AREA)

Abstract

An endmill having a body formed from a single piece of material and having length greater than 1.6 inches and a method for forming such an endmill are provided. The method includes sintering a blank with an ultra hard material while in a heater having a length of at least 1.6 inches.

Description

ENDMILLS AND METHOD OF MAKING THE SAME
BACKGROUND OF THE INVENTION
An endmill typically is used for machining a surface, edges, grooves, pockets and slots. It can be made of high speed steel, or solid cemented carbide, but it can also consist of a steel tool body with cemented carbide inserts as cutting means. For certain applications, endmills having cutting edges formed of a superhard material, such as PCD, are usually used for the machining of non-ferrous alloys such as aluminum, brass, magnesium, composites, and the like, whereas endmills with cutting edges formed of a superhard abrasive, such as PcBN, are usually used for the machining of ferrous materials such as cast iron and hardened steel and the like.
There are several types of PCD or PcBN endmills on the market today. One method of making an endmill includes sintering at high temperature and high pressure (HPHT) diamond or cBN powder into veins in a solid cylindrical carbide body, i.e., a blank which is then brazed onto a shank and finished into an endmill. When the shank is attached to the endmill blank via brazing or other methods forming a joint, it results in tool with an inherent weakness at the joint. End milling applications under normal conditions exert a complex tensile and shear loads on the endmill that can lead to failure of the endmill at the joint. Consequently, an endmill is desired that does not have this inherent weakness. A method for forming such an endmill is also desired.
SUMMARY OF THE INVENTION
A method is provided allowing for the formation of an ultra hard material, such as a polycrystalline diamond (PCD) or polycrystalline cubic boron nitride (PCBN), endmill from a single solid blank without requiring brazing of the blank onto a shank. In an exemplary embodiment, the method provides for the formation of endmills from blanks having a length of at least 1.6 inches. In a further exemplary embodiment, the method provides for the formation of endmills from blanks having a length of at least 1.7 inches. In another exemplary embodiment, the method provides for the formation of endmills from blanks having a length of at least 1.75 inches. In yet a further exemplary embodiment, the method provides for the formation of endmills from blanks having a length not less than 2 inches, hi yet a further exemplary embodiment, the method provides for using longer enclosures in a conventional sintering press, such as a belt press or a piston-cylinder press, hi one exemplary embodiment, the method allows for the use of longer sintering enclosures and longer heaters which do not incorporate end heating units by alleviating the use of end heaters. hi another exemplary embodiment a method for forming an endmill having polycrystalline ultra hard material is provided. The method includes providing a blank having a groove, placing an ultra hard material in the groove, placing the blank in a refractory metal enclosure, placing the enclosure in a heater which has a length greater than 1.6 inches, and pressing the heater with the enclosure and blank in a press while heating using the heater for sintering the ultra hard material in the groove forming an polycrystalline ultra hard material. In another exemplary embodiment, the heater has a length of about 2.5 inches. In one exemplary embodiment, the blank has a length of at least 1.6 inches. In yet another exemplary embodiment, the heater has a length greater than 1.7 inches and the blank has a length greater 1.7 inches. In yet a further exemplary embodiment, the heater has a length greater than 1.75 inches and the blank has a length greater 1.75 inches. In another exemplary embodiment, the heater has a length of about 2 inches and the blank has a length not less than 2 inches.
In another exemplary embodiment, a method is provided for forming an end mill having polycrystalline ultra hard material. The method includes providing a blank having a length greater than 1.6 inches and a groove, placing an ultra hard material in the groove, placing the blank in a refractory metal enclosure, placing the enclosure in a heater, and pressing the heater with the enclosures and blank in a press while heating using the heater for sintering the ultra hard material in the groove forming a polycrystalline ultra hard material in the groove. In one exemplary embodiment, the blank may have a length greater than 1.7 inches. In a further exemplary embodiment, the blank may have a length greater than 1.75 inches. In another exemplary embodiment, the blank may have a length of about 2 inches. In either of the aforementioned exemplary embodiment methods, the blank may be provided in solid or in powder form. Furthermore either of the aforementioned exemplary embodiment methods may include machining the blank to form a flute having a cutting edge defined by the polycrystalline ultra hard material. In an exemplary embodiment, in either of the aforementioned exemplary embodiments the heater does not include end heating units at opposite ends thereof. Furthermore, the presses used may in an exemplary embodiment be a belt press or a piston-cylinder press.
In yet a further exemplary embodiment, an endmill is provided having a body having a length of at least 1.6 inches including a grip portion and being formed from a single piece of material. Polycrystalline ultra hard material is bonded to the body. In another exemplary embodiment, the body has a length of at least 1.7 inches. In a further exemplary embodiment, the body has a length of at least 1.75 inches. In yet another exemplary embodiment, the body has a length of not less than 2 inches. In a further exemplary embodiment, the polycrystalline ultra hard material does not extend to the grip portion.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view of a conventional endmill blank having veins of sintered ultra hard material.
FIG. 2 is a side view of a conventional endmill blank brazed onto a shank. FIG. 3 is a perspective view of a conventional endmill blank finished into an endmill.
FIG. 4 is a partial cross-sectional view of a conventional heater for use in a sintering process.
FIG. 5 is a cross-sectional view of an exemplary embodiment longer heater for use in an exemplary embodiment sintering process.
FIG. 6 is a side view of an exemplary embodiment endmill blank of the present invention.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a helical endmill with polycrystalline cubic boron nitride
(PcBN) or polycrystalline diamond (PCD) cutting edges and to a method of making the same. There are several types of PCD or PcBN endmills on the market today. One method of making an endmill includes sintering at high temperature and high pressure (HPHT) diamond or cBN powder into veins in a solid cylindrical carbide body, i.e., a blank which is then brazed onto a shank and finished into an endmill. Exemplary endmills and methods of making the same are described in U.S. Patent Nos. 4,991,467; 5,031,484; 5,115,697; and 5,685,671, the contents of which are fully incorporated herein by reference.
An endmill is typically formed from a cylindrical tungsten carbide blank 10 having helical grooves or veins 12 formed longitudinally on its outer surface, as for example shown in FIG. 1, which are packed with either diamond or cubic boron nitride and a binder. The blank with the packed grooves is then HPHT sintered in a refractory metal enclosure, typically referred to as a "can", such as a can made of Niobium or Tantalum. The sintering takes place in a press such as a cubic press. During sintering, the diamond or cBN form polycrystalline diamond (PCD) or polycrystalline cubic boron nitride (PcBN), respectively and simultaneously bond to the tungsten carbide blank.
With current endmills, the length the of the blank is very short, typically less than 1.5 inch. To accommodate for the short length of the blank and to provide a means for holding the tool, i.e., the endmill, the blank is brazed onto a shank 16 as for example shown in FIG. 2. The blank with the polycrystalline ultra hard material and shank combination is then machined to form flutes 15 thereby forming the endmill having ultra hard material cutting edges 17 as for example shown in FIG. 3.
When sintering the blank to form conventional endmills, the blank with grooves packed with diamond or cubic boron nitride is placed in a refractory metal enclosure 11 which is then surrounded by salt 13 and placed in a cylindrical heater 20. Current rings (not shown) and end disks 26 are coupled to the heater which provide current to the heater which in turn heats the enclosure with the blank by resistive heating. The resistive heating is radial heating (as shown by arrows 22 in FIG. 4) through the circumferential outer surface of the heater, when the enclosure is supplied with current through current rings (not shown). The end disks provide for axial heating as shown by arrows 24. The end disks 26 are typically resistive type of heaters. The heater with the enclosure is then placed within the press workspace where it is subjected to pressure. The temperature provided by the heater and the pressure provided by the press for sintering are at levels where diamond and CBN are thermodynamically stable.
Conventional cubic sintering presses cannot accommodate a longer heater with end heaters thus limiting the length of the blank being sintered. A typical cubic press typically has a working space having a length of 2.5 inches and can accommodate a conventional heater which has a length of about 1.60 inches, along with two end disks 26. A conventional refractory metal enclosure has a length of about 1.50 inches. The entire heater length is taken up by the refractory metal enclosure and the salt. Consequently, the length of endmill blanks produced by conventional cubic sintering presses and heaters are limited to a length of about 1.50 inches.
In attempting to overcome these limitations, applicants have discovered that they can sufficiently heat the blank for sintering using only radial heating without using end heating under sufficient pressure supplied by a high pressure apparatus. In this regard, the end disks 26 that are usually used for end heating are not required allowing more length within the press working space to accommodate a longer heater 32 (FIG. 5) and thus, a longer blank. For example, in one exemplary embodiment, applicants were able to use a heater having a length of 2.528 inches. This size heater can be accommodated in a belt press or a piston- cylinder press. With this heater, applicants were able to use a longer refractory metal enclosure to form the endmill blank. With the longer heaters applicants have been able to form endmill blanks having a length of 2 inches or greater. By forming of a longer blank, the need to braze a shank to the blank is alleviated. In an exemplary embodiment, a blank 40, such as a cylindrical tungsten carbide substrate is provided with longitudinally extending helical grooves 42 which are packed with the appropriate powder, e.g., diamond or cBN powder. The blank with grooves may be formed using any known method. For example the cylindrical blank may be formed using conventional methods and then machined to form the grooves. Alternatively, the blank may be molded with the grooves in place, hi another exemplary embodiment, the blank may be provided is powder form such that it is solidified during the sintering process. In yet another exemplary embodiment, the blank may be provided in a powder form bound together with a binder.
With the exemplary embodiment shown in FIG. 6, the helical grooves 42 do not extend along the entire length 44 of the blank body 40. In this regard, when the blank is formed, it is formed with a portion 46 not having any ultra hard material. The blank portion including the ultra hard material is then machined to the appropriate shape without being brazed to a shank. Consequently, an endmill is formed where the portion 46 defines a grip portion. The grip portion is used to mount the endmill in different apparatuses, such as machine collets or holding apparatuses. For example, the end portion of the endmill may be shrink fitted in a shrink fit holder which is then mounted onto a tool used for endmilling purposes. In an alternate exemplary embodiment, a longer blank is formed having longitudinal helical grooves extending along the entire length of the blank, m yet a further exemplary embodiment, the blanks may be formed with only a single groove for receiving the appropriate ultra hard material.
Whereas typical endmills require that they be brazed onto a shank because they have a length less than 1.5 inches, the present invention provides for forming endmill blanks having a length greater than 1.6 inches and more preferably greater than 1.7 inches, thus, providing a grip portion and not requiring brazing to an shank. In an exemplary embodiment, an endmill blank is formed having a length greater than 1.75 inches. In another exemplary embodiment, an endmill blank is formed having a length greater than 1.7 inches and up to 2 inches. In another exemplary embodiment, an endmill blank is formed which has a length of at least 2 inches.
Although the present invention has been described and illustrated to respect to multiple embodiments thereof, it is to be understood that it is not to be so limited, since changes and modifications may be made therein which are within the full intended scope of this invention as hereinafter claimed.

Claims

1 WHAT IS CLAIMED IS :
1. A method for forming an end mill having polycrystalline ultra hard material comprising:
<- providing a blank having a groove; placing an ultra hard material in the groove; placing the blank in a refractory metal enclosure; placing the enclosure in a heater, said heater having a length greater than 1.6 inch; and
1 n pressing the heater with blank in a press while heating using said heater for sintering the ultra hard material in the groove forming a polycrystalline ultra hard material in the groove.
2. The method as recited in claim 1 wherein the heater has a length of about 2.5 inches. 15
3. The method as recited in claim 1 wherein providing a blank comprises providing a blank having a length of at least 1.6 inches.
4. The method as recited in claim 1 wherein the heater has a length greater than 20 1.7 inches wherein providing a blank comprises providing a blank having a length greater 1.7 inches.
5. The method as recited in claim 1 wherein the heater has a length greater than 1.75 inches wherein providing a blank comprises providing a blank having a length greater
1.75 inches.
25
6. The method as recited in claim 1 wherein the heater has a length of about 2 inches wherein providing a blank comprises providing a blank having a length no less than about 2 inches.
~~ 7. The method as recited in claim 1 wherein the blank is provided in powder form.
8. The method as recited in claim 1 further comprising machining the blank to form a flute having a cutting edge defined by the polycrystalline ultra hard material.
35 9. The method as recited in claim 1 wherein the press is selected from the group or presses consisting of belt presses and piston-cylinder presses.
1 10. The method as recited in claim 1 wherein the heater does not include end heating units at opposite ends thereof.
11. A method for forming an end mill having polycrystalline ultra hard material - comprising: providing a blank having a length greater than 1.6 inches and a groove; placing an ultra hard material in the groove; placing the blank in a refractory metal enclosure; placing the enclosure in a heater; and
, Q pressing the heater in a press while heating using said heater for sintering the ultra hard material in the groove forming a polycrystalline ultra hard material in the groove.
12. The method as recited in claim 11 wherein providing a blank comprises providing a blank having a length greater than 1.7 inches.
15 13. The method as recited in claim 11 wherein providing a blank comprises providing a blank having a length greater than 1.75 inches.
14. The method as recited in claim 11 wherein providing a blank comprises providing a blank having a length of about 2 inches.
20 15. The method as recited in claim 11 further comprising machining the blank to form a flute having a cutting edge defined by the polycrystalline ultra hard material.
16. The method as recited in claim 11 wherein the press is selected from the group or presses consisting of belt presses and piston-cylinder presses. 5
17. The method as recited in claim 11 wherein the heater is elongate and does not include end heating units at opposite ends thereof.
18. An endmill comprising: a body having a length of at least 1.6 inches and comprising a grip portion, 0 said body being formed from a single piece of material; and polycrystalline ultra hard material bonded to the body.
19. The endmill as recited in claim 18 wherein the body comprises a length of at least 1.7 inches. 5
20. The endmill as recited in claim 18 wherein the body comprises a length of at least 1.75 inches.
1 21. The endmill as recited in claim 18 wherein the body comprises a length not less than 2 inches.
22. The endmill as recited in claim 18 wherein the polycrystalline ultra hard <. material does not extend to the grip portion.
10
15
20
25
0
5
EP06749067A 2005-03-30 2006-03-30 Endmills and method of making the same Withdrawn EP1866114A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US66686005P 2005-03-30 2005-03-30
PCT/US2006/012014 WO2006105427A2 (en) 2005-03-30 2006-03-30 Endmills and method of making the same

Publications (1)

Publication Number Publication Date
EP1866114A2 true EP1866114A2 (en) 2007-12-19

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EP06749067A Withdrawn EP1866114A2 (en) 2005-03-30 2006-03-30 Endmills and method of making the same

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US (2) US20060239850A1 (en)
EP (1) EP1866114A2 (en)
JP (1) JP2008538536A (en)
WO (1) WO2006105427A2 (en)
ZA (1) ZA200707731B (en)

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JP2008538536A (en) 2008-10-30
US20060239850A1 (en) 2006-10-26
ZA200707731B (en) 2009-10-28
US20080131304A1 (en) 2008-06-05
WO2006105427A2 (en) 2006-10-05
WO2006105427A3 (en) 2009-04-16

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