Senior Fitness - Exercise and Nutrition for Aging Men and Women
FREE Article Feed for your website.
Home Ownership Magazine
Party Planning Information
Article Marketing Resources
Bio-Medical Research Article Database
Informative Articles on Life, Love and Happiness
Tutorials on Business to Writing
Famous Quotes from Famous People
Song Lyric Information
New US Patent Information
Comprehensive List of Content by Category
Online Auctions and Shopping Related Articles
Article Search
Most Recent Articles
Title: Image processing method
Patent Number: 7,437,017 Issued on 10/14/2008 to Aihara

Title: Image enhancement
Patent Number: 7,437,016 Issued on 10/14/2008 to Gutenev

Title: Method of reducing a blocking artifact when coding moving picture
Patent Number: 7,437,015 Issued on 10/14/2008 to Kim,   et al.

Title: Methods and systems for model reduction and system identification of dynamic systems with multiple inputs
Patent Number: 7,437,014 Issued on 10/14/2008 to Kim

Title: Directional spatial video noise reduction
Patent Number: 7,437,013 Issued on 10/14/2008 to Anderson

Title: Singular integral image deblurring method
Patent Number: 7,437,012 Issued on 10/14/2008 to Carasso

Title: Image processing apparatus and method
Patent Number: 7,437,011 Issued on 10/14/2008 to Kato

Title: Method for imaging coding by rate-distortion adaptive zero-tree-based residual vector quantization and system for effecting same
Patent Number: 7,437,010 Issued on 10/14/2008 to Budge,   et al.

Title: Image coding apparatus, image coding method, and image coding program for coding at least one still frame with still frame coding having a higher quality than normal frame coding of other fram
Patent Number: 7,437,009 Issued on 10/14/2008 to Uchibayashi,   et al.

Title: Image predictive coding method
Patent Number: 7,437,008 Issued on 10/14/2008 to Shen,   et al.

Title: Region-of-interest editing of a video stream in the compressed domain
Patent Number: 7,437,007 Issued on 10/14/2008 to Augustine,   et al.

Title: Error propogation and variable-bandwidth mean shift for feature space analysis
Patent Number: 7,437,006 Issued on 10/14/2008 to Bascle,   et al.

Title: Rapid visual sorting of digital files and data
Patent Number: 7,437,005 Issued on 10/14/2008 to Drucker,   et al.

Title: Method for processing data structures with networked semantic units
Patent Number: 7,437,004 Issued on 10/14/2008 to Baatz,   et al.

Title: System and method for handling electronic ink
Patent Number: 7,437,003 Issued on 10/14/2008 to Gorbatov,   et al.

Title: Image recognition system utilizing an edge image and a binary image
Patent Number: 7,437,002 Issued on 10/14/2008 to Tanaka

Title: Method and device for recognition of a handwritten pattern
Patent Number: 7,437,001 Issued on 10/14/2008 to Morwing,   et al.

Title: Full spectrum color detecting pixel camera
Patent Number: 7,437,000 Issued on 10/14/2008 to Rosenthal,   et al.

Title: Data analysis device and data recognition device
Patent Number: 7,436,999 Issued on 10/14/2008 to Ohmi,   et al.

Title: Method and apparatus for red-eye detection in an acquired digital image based on image quality pre and post filtering
Patent Number: 7,436,998 Issued on 10/14/2008 to Steinberg,   et al.

Title: Light source estimating device, light source estimating method, and imaging device and image processing method
Patent Number: 7,436,997 Issued on 10/14/2008 to Ishigami,   et al.

Title: Device, system and method of data conversion for wide gamut displays
Patent Number: 7,436,996 Issued on 10/14/2008 to Ben-Chorin,   et al.

Title: Image-processing apparatus, image-capturing apparatus, image-processing method and image-processing program
Patent Number: 7,436,995 Issued on 10/14/2008 to Ito,   et al.

Title: System of using neural network to distinguish text and picture in images and method thereof
Patent Number: 7,436,994 Issued on 10/14/2008 to Huang

Title: Apparatus and method for detecting defects in periodic pattern on object
Patent Number: 7,436,993 Issued on 10/14/2008 to Onishi,   et al.

Title: Methods and apparatus for testing a component
Patent Number: 7,436,992 Issued on 10/14/2008 to Suh,   et al.

Title: Image buffers and access schedules for image reconstruction systems
Patent Number: 7,436,991 Issued on 10/14/2008 to Greenbaum,   et al.

Title: Blood flow dynamic analyzer and its method, and image diagnostic apparatus
Patent Number: 7,436,990 Issued on 10/14/2008 to Omi,   et al.

Title: Generation, verification and reproduction of a digitized writing
Patent Number: 7,436,989 Issued on 10/14/2008 to Chung,   et al.

Title: 3D face authentication and recognition based on bilateral symmetry analysis
Patent Number: 7,436,988 Issued on 10/14/2008 to Zhang,   et al.

Title: Positive patient identification
Patent Number: 7,436,986 Issued on 10/14/2008 to Caldwell

Title: Personal identity authentication process and system
Patent Number: 7,436,985 Issued on 10/14/2008 to Kittler

Title: Method and system for stabilizing video data
Patent Number: 7,436,984 Issued on 10/14/2008 to Auberger

Title: Image recognition apparatus and image recognition program
Patent Number: 7,436,983 Issued on 10/14/2008 to Miyamori

Title: Vehicle surroundings monitoring apparatus
Patent Number: 7,436,982 Issued on 10/14/2008 to Taniguchi,   et al.

Title: Graphical object models for detection and tracking
Patent Number: 7,436,980 Issued on 10/14/2008 to Sigal,   et al.

Title: Embedding variable watermark information in halftone screens
Patent Number: 7,436,977 Issued on 10/14/2008 to Wang,   et al.

Title: Digital watermarking systems and methods
Patent Number: 7,436,976 Issued on 10/14/2008 to Levy,   et al.

Title: Image reading apparatus, image reading method and image reading system
Patent Number: 7,436,975 Issued on 10/14/2008 to Shibata

Title: System and method for securing headphone transducers
Patent Number: 7,436,974 Issued on 10/14/2008 to Harper

Title: Structure for earphones with multiple sound tracks
Patent Number: 7,436,973 Issued on 10/14/2008 to Liao

Title: Folded coaxial transmission line loudspeaker
Patent Number: 7,436,972 Issued on 10/14/2008 to Bouvier

Title: Method and system for optimizing denoising parameters using compressibility
Patent Number: 7,436,969 Issued on 10/14/2008 to Seroussi,   et al.

Title: Adaptive noise reduction method and device
Patent Number: 7,436,968 Issued on 10/14/2008 to Ozawa

Title: Apparatus and method of limiting power applied to a loudspeaker
Patent Number: 7,436,967 Issued on 10/14/2008 to Neunaber

Title: Secure approach to send data from one system to another
Patent Number: 7,436,966 Issued on 10/14/2008 to Prashanth

Title: Synchronization of encryption in a wireless communication system
Patent Number: 7,436,964 Issued on 10/14/2008 to Klingler,   et al.

Title: Process for generating codes for CDMA communications, system and computer program product therefor
Patent Number: 7,436,963 Issued on 10/14/2008 to Lo Iacono,   et al.

Title: Method and apparatus for providing secured communication connections using a secured communication connection object
Patent Number: 7,436,962 Issued on 10/14/2008 to Rodriguez,   et al.

Title: Sentinel synchronization method for enhancing QKD security
Patent Number: 7,436,961 Issued on 10/14/2008 to Mitchell,   et al.

Title: Data recording apparatus and recording method
Patent Number: 7,436,959 Issued on 10/14/2008 to Sako

Title: Method of distributed IPMP device messaging and carriage of rights in MPEG IPMP content
Patent Number: 7,436,958 Issued on 10/14/2008 to Ji,   et al.

Title: Encrypting and decrypting a data stream
Patent Number: 7,436,955 Issued on 10/14/2008 to Yan,   et al.

Title: Security system with an intelligent DMA controller
Patent Number: 7,436,954 Issued on 10/14/2008 to Apostol, Jr.,   et al.

Title: Hacking prevention system
Patent Number: 7,436,953 Issued on 10/14/2008 to Halperin,   et al.

Title: Earset microphone
Patent Number: 7,436,952 Issued on 10/14/2008 to Darbut

Title: Portable interconnection system for incompatible audio communication networks
Patent Number: 7,436,951 Issued on 10/14/2008 to Pflasterer,   et al.

Title: Apparatus and method for real-time power distribution management
Patent Number: 7,436,950 Issued on 10/14/2008 to Chheda,   et al.

Title: Personal ring tone message indicator
Patent Number: 7,436,949 Issued on 10/14/2008 to Weiner

Title: Method and apparatus for automatic notification and response based on communication flow expressions
Patent Number: 7,436,947 Issued on 10/14/2008 to Ordille,   et al.

Title: Reliable call progress indication for SIP
Patent Number: 7,436,946 Issued on 10/14/2008 to Peterson

Title: Repeating device
Patent Number: 7,436,944 Issued on 10/14/2008 to Yoshida,   et al.

Title: Method and apparatus for managing telephone number, and computer product
Patent Number: 7,436,943 Issued on 10/14/2008 to Oshika,   et al.

Title: System and method for charging in a communication network
Patent Number: 7,436,942 Issued on 10/14/2008 to Hakala,   et al.

Title: Methods and systems for enabling a reply call to voice mail message
Patent Number: 7,436,940 Issued on 10/14/2008 to Adamczyk,   et al.

Title: Method and system for consolidated message notification in a voice command platform
Patent Number: 7,436,939 Issued on 10/14/2008 to Packingham,   et al.

Title: Method of providing 911 service
Patent Number: 7,436,938 Issued on 10/14/2008 to Savaglio,   et al.

Title: VoIP call through tester
Patent Number: 7,436,936 Issued on 10/14/2008 to Terpstra,   et al.

Title: Qualifying telephone lines for data transmission
Patent Number: 7,436,935 Issued on 10/14/2008 to Faulkner

Title: Reception apparatus and method, and channel response measurement apparatus for receiving an orthogonal frequency divisional multiplexing signal
Patent Number: 7,436,759 Issued on 10/14/2008 to Hayashi,   et al.

Title: Scattered pilot and filtering for channel estimation
Patent Number: 7,436,757 Issued on 10/14/2008 to Wilson,   et al.

Title: Optical information recording medium, recording and reproduction methods using the same, optical information recording device, and optical information reproduction device
Patent Number: 7,436,755 Issued on 10/14/2008 to Takamori,   et al.

Title: Contact probe storage FET sensor
Patent Number: 7,436,753 Issued on 10/14/2008 to Mejia,   et al.

Title: Disposable article with containment structure
Patent Number: 6,790,202 Issued on 09/14/2004 to Klemp,   et al.

Title: Compensation for power variation along patient cables
Patent Number: 6,790,206 Issued on 09/14/2004 to Panescu

Inserts for metal cutting purposes Number:6,811,580 from the United States Patent and Trademark Office (PTO) owispatent

Home    Author Login    Submit Article    Article Search    Add Your Link    Edit Your Link    Contact Us    Advertising    Disclaimer

   

 
Web LinkGrinder.com

Top Breaking News
     Greek, Cypriot Leaders Resume Unification Talks in Nicosia by Nathan Morley
     Indonesia Tobacco Sales Grow, Raising Health Fears
     South Korea Allows Top Defector to Travel Overseas by VOA News

Title: Inserts for metal cutting purposes

Abstract: The present invention relates to a cutting tool with increased tool life when machining grey cast iron. The tool comprises a solid CBN-containing body containing more than 60 vol % CBN and a coating. The coating consists of at least one layer of metal nitride, carbonitride or carbide with the metal elements selected from at least one of Ti, Nb, Hf, V, Ta, Mo, Zr, Cr, W and Al, with a total thickness of 2-7 .mu.m and 2-8 .mu.m of .alpha.- and/or .kappa.-Al.sub.2 O.sub.3. The coating is a CVD coating deposited at 900.degree. C. or higher.

Patent Number: 6,811,580 Issued on 11/02/2004 to Littecke


Inventors: Littecke; Peter (Huddinge, SE)
Assignee: Sandvik AB (Sandviken, SE)
Appl. No.: 09/959,723
Filed: January 7, 2002
PCT Filed: May 04, 2000
PCT No.: PCT/SE00/00886
PCT Pub. No.: WO00/68457
PCT Pub. Date: November 16, 2000


Foreign Application Priority Data

May 06, 1999 [SE] 9901649

Current U.S. Class: 51/307 ; 427/255.11; 427/255.23; 427/255.32; 428/216; 428/336; 428/698; 428/699; 428/704; 51/309
Field of Search: 428/216,336,698,699,704,701 51/307,309 427/255.11,255.23,255.32,255.391,255


References Cited [Referenced By]

U.S. Patent Documents
5326380 July 1994 Yao et al.
5861210 January 1999 Lenander et al.
5879823 March 1999 Prizzi et al.
Foreign Patent Documents
102843 Mar., 1984 EP
701982 Mar., 1996 EP
714719 Jun., 1996 EP
07-018415 Jan., 1995 JP
7024606 May., 1995 JP
08-323506 Dec., 1996 JP
10-245287 Sep., 1998 JP
98/28464 Jul., 1998 WO
Primary Examiner: Turner; Archene
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis, L.L.P.

Parent Case Text



This application is a national stage application of PCT/SE00/00886 under 35 U.S.C. .sctn.371, filed May 4, 2000, that designated the United States of America, and which claims priority to Swedish Application No. 9901649-5, filed on May 6, 1999, and which PCT application was published in English on Nov. 16, 2000.
Claims



What is claimed is:

1. A cutting tool for the machining of grey cast iron comprising: a CBN-substrate comprising more than 60 vol % CBN; and a CVD coating deposited at 1000.degree. C. or higher comprising at least one layer of metal nitride, carbonitride or carbide with the metal elements selected from the group consisting of Ti, Nb, Hf, V, Ta, Mo, Zr, Cr, W and Al and at least one layer of .alpha. and/or .kappa.-Al.sub.2 O.sub.3, and wherein a total thickness of the at least one layer of metal nitride, carbonitride or carbide is 2-7 .mu.m and a total thickness of the at least one layer of .alpha.- and/or .kappa.-Al.sub.2 O.sub.3 is 2-8 .mu.m.

2. The cutting tool according to claim 1, wherein the cutting tool has a central clamping hole.

3. The cutting tool according to claim 1, wherein the substrate has a backing that is cemented carbide free.

4. The cutting tool according to claim 1, wherein the total thickness of the at least one layer of metal nitride, carbonitride or carbide is 3-5 .mu.m.

5. The cutting tool according to claim 1, wherein the at least one layer of metal nitride, carbonitride or carbide is a layer of TiC, TiCN, TiN or TiAIN.

6. The cutting tool according to claim 1, wherein the total thickness of the at least one layer of .alpha.- and/or .kappa.-Al.sub.2 O.sub.3 is 4-7 .mu.m.

7. The cutting tool according to claim 1, wherein the substrate comprises at least approximately 90 volume % CBN.

8. A method of machining a grey cast iron, comprising: providing a cutting tool comprising a solid CBN-substrate comprising more than 60% by volume CBN and a CVD coating deposited by CVD at a temperature of 1000.degree. C. or higher, said coating comprising at least one layer of metal nitride, carbonitride or carbide having at least one metal element selected from the group consisting of Ti, Nb, Hf, V, Ta, Mo, Zr, Cr, W and Al, and at least one layer of .alpha.- and/or .kappa.-Al.sub.2 O.sub.3, wherein a total thickness of the at least one layer of metal nitride, carbonitride or carbide is 2-7 .mu.m and a total thickness of the at least one layer of .alpha.- and/or .kappa.-Al.sub.2 O.sub.3 is 2-8 .mu.m; and machining the grey cast iron with the cutting tool.
Description



FIELD OF THE INVENTION

The present invention relates to a cutting tool with increased tool life when machining grey cast iron.

BACKGROUND OF THE INVENTION

In the description of the background of the present invention that follows reference is made to certain structures and methods, however, such references should not necessarily be construed as an admission that these structures and methods qualify as prior art under the applicable statutory provisions. Applicants reserve the right to demonstrate that any of the referenced subject matter does not constitute prior art with regard to the present invention.

Cutting tools having cutting edges formed of a superhard abrasive such as a cubic boron nitride (CBN) based material are manufactured by powder metallurgical techniques and are to an increasing extent used for the machining of cast iron and hardened steel. Several types of CBN cutting tools are known, the majority consisting of a CBN tip that has been brazed onto a cemented carbide insert. Others have the CBN sintered directly to a cemented carbide backing of sufficient thickness to produce an insert while yet others consist of mainly CBN without any cemented carbide backing.

Subjecting an insert with a brazed on CBN/cemented carbide tip to temperatures over 700.degree. C. will result in destroying the braze, but for inserts without any braze joint there is no such limitation.

When machining hardened steels, e.g., ball bearing steels, chemical dissolution of the tool material is an important part of the wear mechanism, provided that the tool material has sufficient hot hardness to resist plastic deformation. For that reason the CBN materials used for such work materials usually contain a high fraction of secondary phases with low chemical solubility in steel. In WO 98/28464 it is shown in the example that applying a coating including a MTCVD-TiCN and a CVD-Al.sub.2 O.sub.3 -layer to such a low CBN tool material, substantial advantages in tool life can be achieved when machining hardened ball bearing steel. The CVD-coating is applied to a substrate comprising cemented carbide and at least one CBN body whereby the cemented carbide constitutes the main part of the substrate.

When machining grey cast iron, the dominating wear mechanism is of abrasive nature, and consequently due to the high hardness of CBN, the most suitable material for grey cast iron is that of high CBN content, generally more than 60%, often over 80%. An example of such a material is disclosed in U.S. Pat. No. 5,326,380. Inserts of this type are usually produced as a layer of CBN-containing material bonded through sintering to a cemented carbide backing, or a solid CBN-compact thus having no braze joint on the finished insert that can be damaged at normal CVD coating temperatures.

SUMMARY OF THE INVENTION

The tool comprises a CBN-containing body with more than 60 vol % CBN and a coating. The coating consists of at least one layer of metal nitride, carbonitride or carbide with the metal elements selected from at least one of Ti, Nb, Hf, V, Ta, Mo, Zr, Cr, W and Al and at least one layer of Al.sub.2 O.sub.3. The coating is a CVD coating deposited at 900.degree. C. or higher.

DETAILED DESCRIPTION OF THE INVENTION

Now it has been found that applying a CVD-coating to such an insert made from high CBN-content material will also increase the performance leading to increased tool life when machining grey cast iron.

In one preferred embodiment the insert is of solid CBN i.e. without cemented carbide support.

In another preferred embodiment the insert is provided with a central hole for clamping.

In a most preferred embodiment the insert is of solid CBN with a central hole for clamping. This central hole is made by laser machining.

The coating can consist of at least one layer of a metal carbide, nitride and/or carbonitride with the metal element selected from at least one of Ti, Nb, Hf, V, Ta, Mo, Zr, Cr, W and Al, preferably TiC, TiCN, TiN or TiAIN plus at least one layer of Al.sub.2 O.sub.3. The Al.sub.2 O.sub.3 -layer can be .alpha. and/or .kappa. phase. The total coating thickness of the nitride, carbonitride or carbide layer can be 2-7 .mu.m, preferably 3-5 .mu.m, and the total thickness of Al.sub.2 O.sub.3 can be 2-8 .mu.m with a preferred thickness of 4-7 .mu.m.

The total coating thickness according to the invention varies between 4 and 15 .mu.m, preferably between 5 and 10 .mu.m.

The number and thickness of individual coatings can be varied, but the total accumulated thickness of the individual coatings falls within the limitations stated above.

A further improvement in cutting performance can be anticipated if the edges of the Al.sub.2 O.sub.3 coated cutting tools according to the invention are treated by a gentle wetblasting process or by edge brushing with brushes based on e.g. SiC as disclosed in U.S. Pat. No. 5,861,210.

EXAMPLE

A Sandvik CBN insert SNGN 120408F in grade CB50 containing about 90% CBN by volume was coated with a 4 .mu.m inner layer of TICN and it 6 .mu.m outer layer of .alpha.-Al.sub.2 O.sub.3 using CVD-technique at a temperature of about 1000.degree. C.

It was then used to machine workpieces of pearlitic grey cast iron (Swedish standard SS0125) at a cutting speed of 500 m/min using a feed rate of 0.3 nm/rev and a depth of cut of 0.5 mm. The table below shows flank wear in mm versus time in cut under dry cutting conditions. An uncoated CBN of the same composition was used as a reference.

Number of passes Variant 4 8 12 16 20 24 28 Uncoated 0.09 0.11 0.21 0.26 0.30 0.34 0.35 reference Present 0.05 0.07 0.09 0.09 0.10 0.12 0.13 invention

While the present invention has been described by reference to the above-mentioned embodiments, certain modifications and variations will be evident to those of ordinary skill in the art. Therefore, the present invention is to limited only by the scope and spirit of the appended claims.

*


Free Web Sudoku Puzzles.
Solve with your browser.
  1       9   8  
        2   4 6  
          1     7
        1 7 8    
  8           5  
    1 3 4        
3     7          
  6 5   3        
  4   2       7  
What is it?



Add Your Site · Terms Of Service · Privacy Policy


DISCLAIMER
Linkgrinder is a free service that searches the Internet and indexes all files found so that you may search quickly and easily for shared files. These files are created and made available individually by users whose identity we are not aware of and who we have no control over. In essence we function like a search engine tool; these files ARE NOT STORED OR SERVED BY OUR NETWORK. We are not responsible for any materials obtained by using our service. We do not monitor any of the contents of these files. These files may contain viruses, illegal materials, materials inappropriate for minors, offensive files and the like. BY USING OUR SERVICE, YOU ASSUME FULL RESPONSIBILITY FOR DOWNLOADING THESE MATERIALS AND WILL INDEMNIFY US FOR ANY DAMAGES THAT MAY BE INCURRED.

For More Specific Information VIEW OUR TERMS OF SERVICE.

Thank you and Enjoy!