Patents by Inventor Per Blomstedt
Per Blomstedt has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7837417Abstract: A ceramic cutting insert, including a face ground top surface, and at least one peripheral clearance surface adjacent to an edge, from which a reinforcing chamfer surface extends inward. The chamfer surface forms a first acute angle with a reference plane that is parallel to the top surface. A generally concave unground intermediate surface is formed between the top surface and the chamfer surface, the intermediate surface at the transition to the top surface forming a second angle with the top surface that is greater than the first angle, and the width of the chamfer surface being greater than the width of the intermediate surface.Type: GrantFiled: December 14, 2006Date of Patent: November 23, 2010Assignee: Sandvik Intellectual Property ABInventor: Per Blomstedt
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Patent number: 7794182Abstract: An indexable milling insert includes opposite top and bottom sides between which a peripheral clearance surface extends, and two opposite cutting edges formed in the transition between the top side and the clearance surface. Each of the cutting edges includes a substantially straight portion connected with a straight section of the clearance surface, and further includes a curved portion connected with a convexly arched section of the clearance surface. A coupling including one or more male- and/or female-like engagement members is located along said clearance surface. Furthermore, the milling insert may be used with a shim plate for attachment to a milling tool.Type: GrantFiled: January 17, 2008Date of Patent: September 14, 2010Assignee: Sandvik Intellectual Property ABInventors: Ralf Lehto, Lars-Gunnar Wallström, Göran Pantzar, Per Blomstedt
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Patent number: 7419336Abstract: An indexable milling insert includes opposite top and bottom sides between which a peripheral clearance surface extends, and two opposite cutting edges formed in the transition between the top side and the clearance surface. Each of the cutting edges includes a substantially straight portion connected with a straight section of the clearance surface, and further includes a curved portion connected with a convexly arched section of the clearance surface. A coupling including one or more male- and/or female-like engagement members is located along said clearance surface. Furthermore, the milling insert may be used with a shim plate for attachment to a milling tool.Type: GrantFiled: May 24, 2006Date of Patent: September 2, 2008Assignee: Sandvik Intellectual Property ABInventors: Ralf Lehto, Lars-Gunnar Wallström, Göran Pantzar, Per Blomstedt
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Publication number: 20080118314Abstract: An indexable milling insert includes opposite top and bottom sides between which a peripheral clearance surface extends, and two opposite cutting edges formed in the transition between the top side and the clearance surface. Each of the cutting edges includes a substantially straight portion connected with a straight section of the clearance surface, and further includes a curved portion connected with a convexly arched section of the clearance surface. A coupling including one or more male- and/or female-like engagement members is located along said clearance surface. Furthermore, the milling insert may be used with a shim plate for attachment to a milling tool.Type: ApplicationFiled: January 17, 2008Publication date: May 22, 2008Inventors: Ralf Lehto, Lars-Gunnar Wallstrom, Goran Pantzar, Per Blomstedt
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Publication number: 20070183858Abstract: A ceramic cutting insert, including a face ground top surface, and at least one peripheral clearance surface adjacent to an edge, from which a reinforcing chamfer surface extends inward. The chamfer surface forms a first acute angle with a reference plane that is parallel to the top surface. A generally concave unground intermediate surface is formed between the top surface and the chamfer surface, the intermediate surface at the transition to the top surface forming a second angle with the top surface that is greater than the first angle, and the width of the chamfer surface being greater than the width of the intermediate surface.Type: ApplicationFiled: December 14, 2006Publication date: August 9, 2007Inventor: Per Blomstedt
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Publication number: 20070081873Abstract: A milling cutter head in the form of a body, which has an external envelope surface having a rotationally symmetrical basic shape in respect of a central axis, and includes a plurality of peripherally spaced-apart cutting edges and chip flutes. The cutter head includes two axially spaced-apart ends in which hollow spaces open, which are arranged to receive male elements included in a basic body, and are spaced-apart by a partition wall in which a through hole is formed. The through hole mouths in bottom surfaces in the hollow spaces. The cross-section area of each individual hollow space, in a plane perpendicular to the center axis, amounts to at least 25% of the total cross-section area of the body, as defined by the greatest diameter of the envelope surface.Type: ApplicationFiled: October 2, 2006Publication date: April 12, 2007Inventors: Per Blomstedt, Ralf Lehto
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Publication number: 20070081872Abstract: A replaceable milling cutter head, which has an external envelope surface having a rotationally symmetrical basic shape in respect of a central axis. The cutter head includes a plurality of peripherally spaced-apart cutting edges and chip flutes, and two axially spaced-apart, front and rear ends. An axial hole extends all the way through a frame of the cutter head. The milling cutter head has a flat, pulley-like basic shape, such that the axial distance between the two ends thereof is at most half as large as the greatest outer diameter thereof. A hollow space for receiving a male element of a basic body is recessed in the rear end of the milling cutter head. The cross-section area of the hollow space, in a plane perpendicular to the center axis, amounts to at least 25% of the total cross-section area of the milling cutter head, as determined by the outer diameter.Type: ApplicationFiled: October 2, 2006Publication date: April 12, 2007Inventors: Per Blomstedt, Ralf Lehto
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Publication number: 20060275088Abstract: An indexable milling insert includes opposite top and bottom sides between which a peripheral clearance surface extends, and two opposite cutting edges formed in the transition between the top side and the clearance surface. Each of the cutting edges includes a substantially straight portion connected with a straight section of the clearance surface, and further includes a curved portion connected with a convexly arched section of the clearance surface. A coupling including one or more male- and/or female-like engagement members is located along said clearance surface. Furthermore, the milling insert may be used with a shim plate for attachment to a milling tool.Type: ApplicationFiled: May 24, 2006Publication date: December 7, 2006Inventors: Ralf Lehto, Lars-Gunnar Wallstrom, Goran Pantzar, Per Blomstedt
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Patent number: 6706327Abstract: A method of making a cemented carbide body having WC with an average grain size of 0.5-4 &mgr;m, 3.5-9 wt % Co and <2 wt % carbides of Ta, Ti and Nb, and with a substoichiometric carbon content, the method including sintering the body such that an eta phase containing structure is obtained with a size of 1-15 &mgr;m and a content of 10 vol. %-35 vol. %, and subjecting the body to recarburization such that the eta phase in a 50-350 &mgr;m wide intermediate zone is transformed to WC+Co without essentially changing its Co-content.Type: GrantFiled: October 11, 2001Date of Patent: March 16, 2004Assignee: Sandvik ABInventors: Per Blomstedt, Mikael Lagerqvist, Marian Mikus
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Publication number: 20020051886Abstract: The present invention relates to a coated body such as a cutting tool insert comprising a wear resistant coating and a cemented carbide body particularly useful for the machining of cast iron parts by turning, milling or drilling at high speeds. The cemented carbide body consists of WC, 3.5-9 wt-% Co and <2 wt-% carbides of Ta, Ti and Nb. It has a core containing finely distributed eta phase islands and an intermediate zone 50-250 &mgr;m thick essentially free of eta phase and with nominal Co content whereby the binder phase in the intermediate zone is present as smaller original islands and larger islands transformed from original eta phase. These latter Co-islands therefore have a size and distribution essentially the same as that of the eta phase in the core. There may be present a thin surface zone free of eta phase with a Co content lower than the nominal Co-content.Type: ApplicationFiled: October 11, 2001Publication date: May 2, 2002Inventors: Per Blomstedt, Mikael Lagerqvist, Marian Mikus
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Patent number: 6344265Abstract: The present invention relates to a coated body such as a cutting tool insert comprising a wear resistant coating and a cemented carbide body particularly useful for the machining of cast iron parts by turning, milling or drilling at high speeds. The cemented carbide body consists of WC, 3.5-9 wt-% Co and <2 wt-% carbides of Ta, Ti and Nb. It has a core containing finely distributed eta phase islands and an intermediate zone 50-250 &mgr;m thick essentially free of eta phase and with nominal Co content whereby the binder phase in the intermediate zone is present as smaller original islands and larger islands transformed from original eta phase. These latter Co-islands therefore have a size and distribution essentially the same as that of the eta phase in the core. There may be present a thin surface zone free of eta phase with a Co content lower than the nominal Co-content.Type: GrantFiled: April 11, 2000Date of Patent: February 5, 2002Assignee: Sandvik A.B.Inventors: Per Blomstedt, Mikael Lagerqvist, Marian Mikus