Vitrified grinding stone

• US 8,568,499 B2
• Filed: 07/02/2009
• Issued: 10/29/2013
• Est. Priority Date: 07/31/2008
• Status: Active Grant

• Current Assignee: Noritake Company Limited (Noritake), Noritake Super Abrasive Co., Ltd. (Noritake)
• Original Assignee: Noritake Company Limited (Noritake), Noritake Super Abrasive Co., Ltd. (Noritake)
• Inventors: Nagata, Akira
• Primary Examiner(s): MCDONOUGH, JAMES E
• Application Number:
  US13/056,828
• Publication Number:
  US 20110135906A1
• Time in Patent Office: 1,580 Days
• Field of Search: 513/07, 512/93, 512/95, 513/09
• US Class Current: 51/307
• CPC Class Codes: B24D 3/18 for porous or cellular structure
• CPC Class Codes: B24D 5/10 with cooling provisions, e.g. with radial slots
• CPC Class Codes: B24D 7/10 with cooling provisions
• CPC Class Codes: Y10T 428/249954 With chemically effective material or specified gas other than air, N, or carbon dioxide in void-containing component

Abstract

A vitrified grinding stone includes: abrasive grains; an inorganic binder that binds the abrasive grains; and air-communicating pores that are formed between the abrasive grains and the inorganic binder, micro-capsules that each encapsulate a lubricant and each have a diameter that is smaller than that of the air-communicating pore, being fixed on an inner wall surface of each of the air-communicating pores by an adhesive.

Claims

1. A vitrified grinding stone comprising:

abrasive grains;

an inorganic binder that binds the abrasive grains; and

air-communicating pores that are formed between the abrasive grains and the inorganic binder; and

micro-capsules that each encapsulate a lubricant and each have a diameter that is smaller than that of the air-communicating that are fixed on an inner wall surface of each of the air-communicating pores by a resin adhesive, and being exposed to the air-communicating pore.

2. The vitrified grinding stone of claim 1, wherein

the micro-capsules have an average capsule diameter of one to 200 μ

mφ

.

3. The vitrified grinding stone of claim 1, wherein

the lubricant encapsulated in each micro-capsule is configured by a grinding liquid.

4. The vitrified grinding stone of claim 2, wherein

the lubricant encapsulated in each micro-capsule is configured by a grinding liquid.

5. The vitrified grinding stone of claim 1, wherein

an outer skin of each micro-capsule is made of any one of gelatin, a melamine resin, a phenolic resin, and a urea resin.

6. The vitrified grinding stone of claim 2, wherein

an outer skin of each micro-capsule is made of any one of gelatin, a melamine resin, a phenolic resin, and a urea resin.

7. The vitrified grinding stone of claim 3, wherein

an outer skin of each micro-capsule is made of any one of gelatin, a melamine resin, a phenolic resin, and a urea resin.

8. The vitrified grinding stone of claim 4, wherein

an outer skin of each micro-capsule is made of any one of gelatin, a melamine resin, a phenolic resin, and a urea resin.

9. The vitrified grinding stone of claim 1, wherein

the abrasive grains are diamond abrasive grains or CBN abrasive grains that have an average grain diameter of five to 250 μ

mφ

, and

the air-communicating pores have an average inner diameter of five to 500 μ

mφ

.

10. The vitrified grinding stone of claim 2, wherein

the abrasive grains are diamond abrasive grains or CBN abrasive grains that have an average grain diameter of five to 250 μ

mφ

), and

the air-communicating pores have an average inner diameter of five to 500 μ

mφ

.

11. The vitrified grinding stone of claim 3, wherein

the abrasive grains are diamond abrasive grains or CBN abrasive grains that have an average grain diameter of five to 250 μ

mφ

, and

the air-communicating pores have an average inner diameter of five to 500 μ

mφ

.

12. The vitrified grinding stone of claim 4, wherein

the abrasive grains are diamond abrasive grains or CBN abrasive grains that have an average grain diameter of five to 250 μ

mφ

, and

the air-communicating pores have an average inner diameter of five to 500 μ

mφ

.

13. The vitrified grinding stone of claim 5, wherein

the abrasive grains are diamond abrasive grains or CBN abrasive grains that have an average grain diameter of five to 250 μ

mφ

, and

the air-communicating pores have an average inner diameter of five to 500 μ

mφ

.

14. The vitrified grinding stone of claim 6, wherein

the abrasive grains are diamond abrasive grains or CBN abrasive grains that have an average grain diameter of five to 250 μ

mφ

, and

the air-communicating pores have an average inner diameter of five to 500 μ

mφ

.

15. The vitrified grinding stone of claim 7, wherein

the abrasive grains are diamond abrasive grains or CBN abrasive grains that have an average grain diameter of five to 250 μ

mφ

, and

the air-communicating pores have an average inner diameter of five to 500 μ

mφ

.

16. The vitrified grinding stone of claim 8, wherein

the abrasive grains are diamond abrasive grains or CBN abrasive grains that have an average grain diameter of five to 250 μ

mφ

, and

the air-communicating pores have an average inner diameter of five to 500 μ

mφ

.

17. The vitrified grinding stone of claim 9, wherein

the vitrified grinding stone is each one of a plurality of grinding stone pieces that are adhered on an outer circumferential surface of a core of a super-abrasive-grain grinding wheel.

18. The vitrified grinding stone of claim 10, wherein

the vitrified grinding stone is each one of a plurality of grinding stone pieces that are adhered on an outer circumferential surface of a core of a super-abrasive-grain grinding wheel.

19. The vitrified grinding stone of claim 11, wherein

the vitrified grinding stone is each one of a plurality of grinding stone pieces that are adhered on an outer circumferential surface of a core of a super-abrasive-grain grinding wheel.

20. The vitrified grinding stone of claim 12, wherein

the vitrified grinding stone is each one of a plurality of grinding stone pieces that are adhered on an outer circumferential surface of a core of a super-abrasive-grain grinding wheel.

21. A manufacturing method of a vitrified grinding stone comprising:

a raw material mixing step of mixing abrasive grains, a viscous binder, and an inorganic binder that binds the abrasive grains;

a molding step of molding the row materials mixed by the raw material mixing step;

a burning step of burning a molded piece molded by the raw material mixing step so as to manufacture a vitrified grinding stone piece formed therein a porous vitrified grinding structure that has the abrasive grains bound by the inorganic binder and that has air-communicating pores;

a grinding stone impregnating step of impregnating the vitrified grinding stone piece in a processing solution included therein micro-capsules that each encapsulate a lubricant and each have a diameter smaller than that of the air-communicating pores, a resin adhesive, and dilution water; and

a drying step of the vitrified grinding stone piece impregnated by the grinding stone impregnating step.