Liquid supply system of an ultrasonic machine

• US 5,144,771 A
• Filed: 01/28/1991
• Issued: 09/08/1992
• Est. Priority Date: 02/06/1990
• Status: Expired due to Fees

• Current Assignee: Brother Kogyo Kabushiki Kaisha
• Original Assignee: Brother Kogyo Kabushiki Kaisha
• Inventors: Miwa, Yuji
• Primary Examiner(s): Rose, Robert A.
• Application Number:
  US07/646,204
• Time in Patent Office: 589 Days
• Field of Search: 51/59 SS, 51/263, 51/292, 51/267, 51/356, 173/57, 175/55, 175/56
• US Class Current: 451/165
• CPC Class Codes: B06B 3/02 involving a change of amplitude
• CPC Class Codes: B23B 37/00 Boring by making use of ultrasonic energy essentially using abrasive material B24B, e.g. B24B1/04

Abstract

In an ultrasonic machine including an ultrasonic horn connected with a piezoelectric transducer and a machining liquid passage, a tool mounted on the ultrasonic horn and provided with a bore inside thereof that communicates with the machining liquid passage, the ultrasonic machine comprising: a fixed side member fixed to the machining body and having a machining liquid supply passage, an annular groove; a horn communication passage communicating with the machining liquid passage; a first thin portion provided near the opening; a pressure chamber drop means provided near the first thin portion; a drain provided in the fixed side member and communicating with the pressure chamber drop means; a second thin portion provided near the pressure chamber drop means; and an air supply passage provided in the fixed side member and communicating with the second thin portion. In the ultrasonic machine, the ultrasonic horn and the fixed side member remains separated to ensure a high-speed rotation and machining liquid does not leak spattering around the tip of the tool.

Claims

1. In an ultrasonic machine including an ultrasonic horn connected with a piezoelectric transducer and rotatably supported by a machine body, the ultrasonic horn having a cylindrical portion formed on the outside thereof and a machining liquid passage for supplying machining liquid formed on the inside thereof, a tool mounted on the ultrasonic horn and provided with a bore inside thereof that communicates with the machining liquid passage, the improvement for minimizing undesired splattering and leakage of the machining liquid comprising:

a) a fixed side member fixed to the machine body and having a machining liquid supply passage that receives a supply of the machining liquid from a machining liquid supply means and an inner surface that rotatably mates with an outer surface of the cylindrical portion;

b) an annular groove formed in said inner surface of said fixed side member, said annular groove communicating with the machining liquid passage;

c) a horn communication passage provided in the ultrasonic horn and having an opening in said outer surface of the cylindrical portion of the ultrasonic horn disposed so as to be opposed to said annular groove, said horn communication passage communicating with the machining liquid passage;

d) a first thin portion provided near said opening and formed by said outer surface of the cylindrical portion and said inner surface of said fixed side member;

e) a pressure drop chamber provided near said first thin portion and formed between said outer surface of the cylindrical portion and said inner surface of said fixed side member;

f) a drain provided in said fixed side member and communicating between said pressure drop chamber and an outside drain opening;

g) a second thin portion provided near said pressure drop chamber and formed by said outer surface of the cylindrical portion and said inner surface of said fixed side member; and

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h) an air supply passage provided in said fixed side member and communicating with said second thin portion.

2. The improvement to an ultrasonic machine of claim 1 wherein:

a cross-sectional area of said pressure drop chamber is sufficiently larger than a cross-sectional area of said first thin portion such that upon entering and accumulating in said pressure drop chamber any machining liquid is rapidly decompressed to approximately atmospheric pressure and is momentarily discharged from said drain.

3. The improvement to an ultrasonic machine of claim 2 wherein:

said outside drain opening is sufficiently large that any machining liquid entering and accumulating in said pressure drop chamber is discharged from said drain without filling up said pressure drop chamber.

4. The improvement to an ultrasonic machine of claim 1 and additionally comprising:

means for supplying compressed air to said air supply passages sufficient to raise pressure of said air supply passage and adjacent said second thin portion up to a level where said second thin portion functions as an air seal preventing machining liquid under approximately atmospheric pressure in said pressure drop chamber from leaking past said second thin portion.

5. In an ultrasonic machine including an ultrasonic horn driven longitudinally by a piezoelectric transducer and rotatably supported by a machine body wherein the ultrasonic horn has a cylindrical portion formed on a moving end thereof carrying a machine tool and there is a machining liquid passage for supplying machining liquid from outside of the cylindrical portion to a passage on the inside thereof and from there to a bore through the machine tool, sealing apparatus for connecting a pressured supply of machining liquid to the machine tool while minimizing undesired splattering and leakage of the machining liquid comprising:

a sealing member carried the machine body and having a main bore therethrough concentrically disposed about the cylindrical portion of the horn in close-spaced relationship thereto to allow longitudinal and rotational motion of the cylindrical portion of the horn in said main bore wherein;

a) said sealing member has a machining liquid supply passage connected on an outer end to a pressured supply of the machining liquid, said machining liquid supply passage having an inner end terminating adjacent an opening to the machining liquid passage in an outer surface of the cylindrical portion;

b) said sealing member has an indentation formed in an inner surface of said main bore communicating with said inner end of said machining liquid supply passage;

c) said sealing member has a pair of first thin portions longitudinally disposed on respective sides of said indentation near said opening;

d) said sealing member has a pressure drop chamber formed therein adjacent said first thin portions, said pressure drop chamber having a drain therein communicating between said pressure drop chamber and an outside drain opening;

e) said sealing member has a pair of second thin portions longitudinally disposed on respective sides of said pressure drop chamber; and

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f) said sealing member has an air supply passage connected to a supply of pressurized air and communicating with said main bore on sides of said second thin portions opposite said pressure drop chamber.

6. The sealing apparatus of claim 5 wherein:

said indentation comprises a first annular groove in said inner surface of said main bore.

7. The sealing apparatus of claim 5 wherein:

a) said indentation comprises a first annular groove in said inner surface of said main bore; and

,

b) said pair of first thin portions is formed by a pair of second annular grooves in said inner surface of said main bore disposed on opposite sides of said first annular groove.

8. The sealing apparatus of claim 7 wherein:

a) said indentation comprises a first annular groove in said inner surface of said main bore;

b) said pair of first thin portions is formed by a pair of second annular grooves in said inner surface of said main bore longitudinally disposed on opposite sides of said first annular groove; and

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c) said pair of second thin portions is formed by a pair of third annular grooves in said inner surface of said main bore disposed longitudinally opposite respective ones of said second annular grooves from said first annular groove.

9. The sealing apparatus of claim 7 wherein:

said drain includes means for connecting said pair of second annular grooves in said inner surface of said main bore.

10. The sealing apparatus of claim 5 wherein:

a cross-sectional area of said pressure drop chamber is sufficiently larger than a cross-sectional area of said first thin portion such that upon entering and accumulating in said pressure drop chamber any machining liquid is rapidly decompressed to approximately atmospheric pressure and is momentarily discharged from said drain.

11. The sealing apparatus of claim 10 wherein:

said outside drain opening is sufficiently large that any machining liquid entering and accumulating in said pressure drop chamber is discharged from said drain without filling up said pressure drop chamber.

12. The sealing apparatus of claim 5 and additionally comprising:

said supply of pressurized air is of a pressure sufficient to raise pressure of said air supply passage and adjacent said second thin portion up to a level where said second thin portion functions as an air seal preventing machining liquid under approximately atmospheric pressure in said pressure drop chamber from leaking past said second thin portion.

13. In an ultrasonic machine including an ultrasonic horn driven longitudinally by a piezoelectric transducer and rotatably supported by a machine body wherein the ultrasonic horn has a cylindrical portion formed on a moving end thereof carrying a machine tool and there is a machining liquid passage for supplying machining liquid from outside of the cylindrical portion to a passage on the inside thereof and from there to a bore through the machine tool, sealing apparatus for connecting a pressured supply of machining liquid to the machine tool while minimizing undesired splattering and leakage of the machining liquid comprising:

a sealing member carried the machine body and having a main bore therethrough concentrically disposed about the cylindrical portion of the horn in close-spaced relationship thereto to allow longitudinal and rotational motion of the cylindrical portion of the horn in said main bore wherein;

a) said sealing member has a machining liquid supply passage connected on an outer end to a pressured supply of the machining liquid, said machining liquid supply passage having an inner end terminating adjacent an opening to the machining liquid passage in an outer surface of the cylindrical portion;

b) said sealing member has a first annular groove formed in an inner surface of said main bore communicating with said inner end of said machining liquid supply passage;

c) said sealing member has a pair of first thin portions longitudinally disposed on respective sides of said indentation near said opening, said pair of first thin portions being defined by a pair of second annular grooves in said inner surface of said main bore disposed on opposite sides of said first annular groove in close-adjacent spaced relationship thereto, said pair of second annular grooves being interconnected within said sealing member to form a pressure drop chamber adjacent said first thin portions, said pressure drop chamber further having a drain therein communicating between said pressure drop chamber and an outside drain opening;

d) said sealing member has a pair of second thin portions longitudinally disposed on respective sides of said pressure drop chamber, said pair of second thin portions being defined by a pair of third annular grooves in said inner surface of said main bore disposed longitudinally opposite respective ones of said second annular grooves from said first annular groove; and

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e) said sealing member has an air supply passage connected to a supply of pressurized air and communicating with said pair of third annular grooves in said inner surface of said main bore.

14. The sealing apparatus of claim 13 wherein:

a cross-sectional area of said pressure drop chamber is sufficiently larger than a cross-sectional area of said first thin portions such that upon entering and accumulating in said pressure drop chamber any machining liquid is rapidly decompressed to approximately atmospheric pressure and is momentarily discharged from said drain.

15. The sealing apparatus of claim 13 wherein:

said outside drain opening is sufficiently large that any machining liquid entering and accumulating in said pressure drop chamber is discharged from said drain without filling up said pressure drop chamber.

16. The sealing apparatus of claim 13 and additionally comprising:

said supply of compressed air is of a pressure sufficient to raise pressure of said air supply passage and adjacent said second thin portions up to a level where said second thin portions function as air seals preventing machining liquid under approximately atmospheric pressure in said pressure drop chamber from leaking past said second thin portions.

17. In an ultrasonic machine including an ultrasonic horn driven longitudinally by a piezoelectric transducer and rotatably supported by a machine body wherein the ultrasonic horn has a cylindrical portion formed on a moving end thereof carrying a machine tool and there is a machining liquid passage for supplying machining liquid from outside of the cylindrical portion to a passage on the inside thereof and from there to a bore through the machine tool, sealing apparatus for connecting a pressured supply of machining liquid to the machine tool while minimizing undesired splattering and leakage of the machining liquid comprising a sealing member carried the machine body and having a main bore therethrough concentrically disposed about the cylindrical portion of the horn in close-spaced relationship thereto to allow longitudinal and rotational motion of the cylindrical portion of the horn in said main bore, said sealing member comprising:

a) a close-fit connecting portion wherein an inner surface of said main bore is concentrically close-adjacent an outer surface of the cylindrical portion, said close-fit connecting portion including a radial passageway communicating with the machining liquid passage to receive pressured machining liquid therefrom;

b) pressure drop chamber means longitudinally disposed about said close-fit portion on opposite sides thereof for forming a chamber having a drain therein communicating with the atmosphere through which machining liquid entering said pressure drop chamber means can flow out of said sealing member;

c) a pair of close-fit air-seal portions wherein an inner surface of said main bore is concentrically close-adjacent an outer surface of the cylindrical portion longitudinally disposed on opposites sides of said pressure drop chamber means; and

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d) air supply means connected for supplying pressurized air adjacent said pair of close-fit air-seal portions or respective sides thereof opposite from sides adjacent said pressure drop chamber means sufficient to raise pressure adjacent said close-fit air-seal portions up to a level where said close-fit air-seal portions function as air seals preventing machining liquid under approximately atmospheric pressure in said pressure drop chamber means from leaking past said close-fit air-seal portion.

18. The sealing member for an ultrasonic machine of claim 17 and additionally comprising:

a) said sealing member having a machining liquid supply passage connected on an outer end to a pressured supply of the machining liquid, said machining liquid supply passage having an inner end terminating adjacent an opening to the machining liquid passage in an outer surface of the cylindrical portion;

b) said sealing member having a first annular groove formed in an inner surface of said main bore communicating with said inner end of said machining liquid supply passage;

c) said sealing member having a pair of first thin portions longitudinally disposed on respective sides of said indentation near said opening, said pair of first thin portions being defined by a pair of second annular grooves in said inner surface of said main bore disposed on opposite sides of said first annular groove in close-adjacent spaced relationship thereto, said pair of second annular grooves being interconnected within said sealing member to form said pressure drop chamber means adjacent said first thin portions, said pressure drop chamber means further having a drain therein communicating between said pressure drop chamber means and an outside drain opening;

d) said sealing member having a pair of second thin portions longitudinally disposed on respective sides of said pressure drop chamber means, said pair of second thin portions being defined by a pair of third annular grooves in said inner surface of said main bore disposed longitudinally opposite respective ones of said second annular grooves from said first annular groove; and

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e) said sealing member having an air supply passage connected to a supply of pressurized air and communicating with said pair of third annular grooves in said inner surface of said main bore.

19. The sealing member for an ultrasonic machine of claim 18 wherein:

a cross-sectional area of said pressure drop chamber means is sufficiently larger than a cross-sectional area of said first thin portion such that upon entering and accumulating in said pressure drop chamber means any machining liquid is rapidly decompressed to approximately atmospheric pressure and is momentarily discharged from said drain.

20. The sealing member for an ultrasonic machine of claim 19 wherein:

said outside drain opening is sufficiently large that any machining liquid entering and accumulating in said pressure drop chamber means is discharged from said drain without filling up said pressure drop chamber means.