CANTILEVER TOOL MANDREL

• US 3,820,422 A
• Filed: 05/29/1973
• Issued: 06/28/1974
• Est. Priority Date: 05/29/1973
• Status: Expired due to Term

• Current Assignee: Lapin J, Rivin E
• Original Assignee: Lapin J, Rivin E
• Inventors: RIVIN E, LAPIN J
• Application Number:
  US05/364,403
• Time in Patent Office: 395 Days
• US Class Current: 82/158
• CPC Class Codes: B23B 29/022 with vibration reducing means
• CPC Class Codes: Y10S 82/904 Vibrating method or tool
• CPC Class Codes: Y10T 408/76 Tool-carrier with vibration-damping means
• CPC Class Codes: Y10T 408/78 Tool of specific diverse material
• CPC Class Codes: Y10T 82/2585 Tool rest

Abstract

A cantilever tool mandrel applied to machining long openings in metals and other materials. It consists of at least two portions: the portion which is adjacent to the fastening place of the mandrel and the portion adjacent to the tool head located on the loose end of the mandrel and carrying the cutter. These portions are fabricated from materials with different moduli of elasticity and densities: the material for the portion adjacent to the fastening place of the mandrel should have a modulus of elasticity which is at least, 1.5 times higher than that of the material for the other portion. The density of the latter should be at least 1.5 times lower than that of the material of the former portion. The length of each portion of the mandrel is from 40 to 60 percent of the total length of the mandrel.

Claims

1. A cantilever tool mandrel comprising a head on its free end with a cutting tool fastened therein, at least two portions fabricated from different materials, one of said portions being adjacent to the fastening place of said mandrel and being fabricated from a material with a modulus of elasticity of at least 1.5 times higher than that of the material of the other said portions, said other portion being adjacent to said head and having a material density of at least 1.5 times lower than that of the material of said portion of the mandrel adjacent to the fastening place of the said mandrel, the length of each portion of said mandrel being from 40 percent to 60 percent of the total length of the mandrel.