Machining tool and method for manufacturing a machining tool

• US 10,105,769 B2
• Filed: 04/15/2015
• Issued: 10/23/2018
• Est. Priority Date: 04/17/2014
• Status: Active Grant

• Current Assignee: Kennametal Incorporated
• Original Assignee: Kennametal Incorporated
• Inventors: Ach, Eduard, Gey, Christoph
• Primary Examiner(s): Fridie, Jr., Will
• Application Number:
  US14/687,189
• Publication Number:
  US 20150298222A1
• Time in Patent Office: 1,287 Days
• CPC Class Codes: B23B 2251/50 Drilling tools comprising cutting inserts
• CPC Class Codes: B23B 51/02 Twist drills
• CPC Class Codes: B23B 51/06 Drills with lubricating or cooling equipment B23B51/042 takes precedence
• CPC Class Codes: B23C 5/006 Details of the milling cutter body
• CPC Class Codes: B23C 5/10 Shank-type cutters, i.e. with an integral shaft
• CPC Class Codes: B23C 5/28 Features relating to lubricating or cooling
• CPC Class Codes: B23P 15/32 twist-drills
• CPC Class Codes: B23P 15/34 milling cutters
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing

Abstract

A machining tool, in particular a drill carrier tool, includes a monolithic base body extending in the axial direction which, at least in one section, has a porous or grid-like core structure that is encased in a solid outer jacket. These measures allow less material to be used, while maintaining good mechanical properties. The porous or grid-like core structure is simultaneously used for transporting coolant. The base body is manufactured in particular by means of a 3D printing method.

Claims

1. A rotary machining tool comprising a monolithic base body extending in an axial direction and comprising a rear shaft part and a fluted cutting part, wherein the base body has a non-solid core structure extending between flutes of the fluted cutting part, the non-solid core structure being encased in a solid outer jacket, the solid outer jacket forming a single body with the non-solid core structure and wherein the non-solid core structure extends into the rear shaft part from the fluted cutting part and has different cross-sectional areas in the rear shaft part relative to the fluted cutting part.

2. The rotary machining tool as claimed in claim 1, wherein the core structure is porous, grid-like, bionic or a combination thereof.

3. The rotary machining tool as claimed in claim 1, wherein the core structure is a honeycomb-like structure.

4. The rotary machining tool as claimed in claim 1, wherein, if the core structure is porous, the core structure has a porosity ranging between 5.2% and 90% and, wherein, if the core structure is grid-like, the core structure has a plurality of canals extending in a longitudinal direction and having a canal width (W) less than 0.5 mm.

5. The rotary machining tool as claimed in claim 1, wherein the core structure of the fluted cutting part has a cross-section which transitions from a narrow center area into a widened area at each end.

6. The rotary machining tool as claimed in claim 1, wherein the core structure covers 5% to 80% of an entire cross-sectional area (A2) of the cutting part of the base body.

7. The rotary machining tool as claimed in claim 1, wherein the core structure is designed to conduct coolant.

8. The rotary machining tool as claimed claim 1, wherein the rotary machining tool is designed as a carrier tool having a cutting element that is adapted to be secured onto the monolithic base body, and wherein the monolithic base body is manufactured from tool steel.

9. The rotary machining tool of claim 5, wherein the core structure of the rear shaft part has a radius, R1, extending from a center axis of the machining tool and the solid outer jacket has a radius, R2, extending from the center axis wherein R1 is 50 to 90 percent of R2.

10. The rotary machining tool of claim 1, further comprising a cutting tip coupled to the monolithic base body.

11. The rotary machining tool of claim 5, wherein the widened areas have arcuate contours running concentrically to a circumferential line of the base body.

12. The rotary machining tool of claim 1, wherein the solid outer jacket has one or more flat portions along circumference of the rear shaft part.

13. The rotary machining tool of claim 1, wherein an end face plate divides the rear shaft portion and cutting portion.

14. The rotary machining tool of claim 1, wherein the core structure is porous having an average pore size of 15 μ

m to 45 μ

m.

15. A rotary cutting tool comprising a monolithic base body extending in an axial direction and comprising a rear shaft part and a fluted cutting part, wherein the base body-has a non-solid core structure extending between flutes of the fluted cutting part, the non-solid core structure being encased in a solid outer jacket, the solid outer jacket forming a single body with the non-solid core structure and wherein the core structure comprises solid struts extending between cutting edges of the fluted cutting part.

16. The rotary cutting tool of claim 15, wherein the struts are sickle shaped.

17. The rotary cutting tool of claim 15, wherein the struts merge at a common point along a central longitudinal axis of the rotary cutting tool.