Chip breaking tool holder

• US 4,848,198 A
• Filed: 04/21/1988
• Issued: 07/18/1989
• Est. Priority Date: 04/21/1988
• Status: Expired due to Term

• Current Assignee: Kennametal Incorporated
• Original Assignee: Kennametal Incorporated
• Inventors: Deemer, Randall E., Royal, Harold J.
• Primary Examiner(s): Schmidt, Frederick R.
• Assistant Examiner(s): Showalter, Robert
• Application Number:
  US07/184,512
• Time in Patent Office: 453 Days
• Field of Search: 407/11, 407/103, 407/107, 407/91, 407/100, 407/109, 29/DIG. 64, 29/DIG. 66, 29/DIG. 92, 285/111
• US Class Current: 82/1.11
• CPC Class Codes: B23B 2250/12 Cooling and lubrication
• CPC Class Codes: B23B 25/02 Arrangements for chip-breaking in turning-machines on cutting tools B23B27/22
• CPC Class Codes: B23B 27/10 Cutting tools with special provision for cooling drills with lubricating or cooling equipment B23B51/06; features relating to lubricating or cooling of milling cutters B23C5/28; arrangements or devices for cooling or lubricating tools or work B23Q11/10
• CPC Class Codes: Y10T 407/14 with means to apply fluid to cutting tool
• CPC Class Codes: Y10T 82/10 Process of turning

Abstract

An hydraulic chip breaking tool holder is provided with a fluid coupler and seal assembly for transferring high pressure, chip breaking fluid from an outlet opening of the main body of the tool holder to an inlet opening of an attached nozzle cap. A coupler in the form of a dowel is interconnected between the openings. At least one of the openings includes a seal cavity having an outer wall. The dowel is inserted through the seal cavity. A deformable pressure sensitive seal is disposed within the seal cavity and extends around the dowel. The pressure of fluid passing through the tool holder causes the seal to radially expand and seal the area between the dowel and the outer wall of the seal cavity, thereby preventing fluid from escaping pst the seal.

Claims

1. A hydraulic chip breaking tool holder for receiving a tool insert having a top clamping surface terminating with a cutting edge, comprising:

(a) a support bar having a top surface formed with an insert seat adapted to receive the tool insert such that the clamping surface is exposed and the cutting edge projects outwardly from the support bar for engaging a workpiece and removing chips of metal therefrom;

(b) a nozzle cap including a bottom surface and multi-contact points mounted atop the support bar such that a gap is defined between the bottom surface of the nozzle cap and the top surface of the support bar, the nozzle cap including a clamping tip for engaging the exposed clamping surface of the tool insert;

(c) a first fluid passage formed in the support bar and including an outlet opening formed in the top surface thereof;

(d) a second fluid passage formed in the nozzle cap which extends from an entrance opening formed in the bottom surface thereof to a discharge orifice lying adjacent the tool insert; and

(e) a fluid coupler and seal assembly interconnected between the support bar and nozzle cap for transferring fluid therebetween including;

(1) a dowel pin extending through the gap and having an internal fluid passage interconnected between the entrance and outlet openings and inserted through at least one of the openings;

(2) a seal cavity formed in the support bar and having an outer wall formed around the opening through which the dowel pin is inserted and wherein the seal cavity is communicatively open to the first fluid passageway formed in the support bar; and

(3) a deformable pressure responsive seal disposed within the seal cavity and surrounding the dowel pin and wherein pressure associated with fluid passing through the first passageway of the support block urges the seal axially along the dowel pin and away from the seal cavity into and through the defined gap between the support block and nozzle cap where the bottom surface of the nozzle cap engages and confines the seal within the defined gap while a portion of the seal remains within the seal cavity, and wherein the seal is held in compression within the defined space by fluid pressure and the bottom surface of the nozzle cap causing the seal to radially expand and form a fluid tight seal across the gap and around the dowel pin.

2. The hydraulic chip breaking tool holder of claim 1 wherein the multi-contact points form a bridge-type clamping configuration between the nozzle cap and the top surface of the support bar.

3. The hydraulic chip breaking tool holder of claim 2 wherein the multi-contact points includes a pair of contact feet longitudinally spaced from the clamping tip and extending downwardly from the nozzle cap for engagement with the top surface of the support bar whereby the clamping tip'"'"'s engagement with the tool insert and the engagement of the contact feet with the top surface of the support bar form the bridge clamping configuration.

4. The hydraulic chip breaking tool holder of claim 1 wherein the seal cavity includes an open top and a lower fluid containing portion that is communicatively open to the fluid passageway in the support bar such that in operation chip breaking fluid is held within the fluid containing portion of the seal cavity and wherein the pressure associated with the chip breaking fluid held within the fluid containing portion of the seal cavity acts to urge the deformable pressure seal upwardly through the open top of the seal cavity.

5. In a hydraulic chip breaking tool holder of the type comprising a nozzle head having a base with a fluid inlet opening formed therein secured to a tool holder head portion having a base with an outlet opening, and means for channelling pressurized fluid into the head portion and out the outlet opening thereof into and through the inlet opening of the nozzle head, the improvement comprising a combined multi-point nozzle head clamping arrangement and sealed fluid coupler assembly for directing fluid from the outlet opening of the head portion into and through the inlet opening of the nozzle head, comprising:

(a) a plurality of contact points extending from the base of the nozzle head for engagement with the base of the tool holder head portion so as to define a gap between the nozzle head and tool holder head portion and the respective fluid openings thereof;

(b) a connecting fluid coupler communicatively connected between the inlet opening of the nozzle head and the outlet opening of the head portion and extending through the defined gap;

(c) the connecting fluid coupler extending into and through at least one of the openings of the nozzle head and head portion;

(d) a seal cavity formed about the opening through which the fluid coupler extends and including an outer wall and wherein the seal cavity is communicatively open to the pressurized fluid passing from the tool holder head portion to the nozzle head; and

(e) a deformable pressure responsive seal disposed within the seal cavity and surrounding the fluid coupler and responsive to the pressurized fluid acting on the same so as to protect from the seal cavity into and through the formed gap with the seal assuming a position within the gap and confined therein by the base of the nozzle head or tool holder head portion disposed opposite the seal cavity whereby the seal is effectively compressed and thereby radially expands within the gap to seal the gap around the fluid coupler and between the fluid openings within the nozzle head and tool holder head portion.

6. The improved hydraulic chip breaking tool holder of claim 5 wherein the fluid coupler comprises an elongated dowel having one end pressed into the inlet opening of the nozzle head and having another end extending from the nozzle head.

7. The improved chip breaking tool holder of claim 6 wherein the seal cavity is formed within the outlet opening of the head portion and wherein the end portion of the dowel extending from the nozzle head is extended through the seal.

8. The improved hydraulic chip breaking tool holder of claim 5 wherein the seal cavity includes an open top and a lower fluid containing portion that is commuicatively open to the pressurized fluid passing from the tool holder head portion to the nozzle head such that in operation chip breaking fluid is held within the fluid containing portion of the seal cavity and the pressure of the chip breaking fluid contained within the fluid containing portion of the seal cavity acts on the deformable seal to urge the same through the open top of the seal cavity.

9. A hydraulic chip breaking tool holder for receiving a tool insert having a top clamping surface terminating with a cutting edge, comprising:

(a) a support bar having a top surface formed with an insert seat adapted to receive the tool insert such that the clamping surface is exposed and the cutting edge projects outwardly from the support bar for engaging a workpiece and removing chips of metal therefrom;

(b) a nozzle cap secured to the top surface of the support bar and including a bottom surface and a clamping tip that extends over the support bar for bridge clamping the tool insert into the seat, and wherein the bridge clamping of the tool insert forms a gap between the nozzle cap and the support bar;

(c) a first fluid passage formed in the support bar and including an outlet opening formed in the top surface thereof;

(d) a second fluid passageway formed in the nozzle cap and communicatively connected to an inlet opening formed in the bottom surface of the nozzle cap;

(e) a seal cavity having an outer wall formed in the outlet opening of the support bar and communicatively open to the fluid passage formed in the support bar;

(f) a dowel including an internal passageway and having one end portion pressed into the inlet opening of the nozzle cap and having a second end portion extending downwardly from the bottom surface of the nozzle cap and extending through the formed gap and into and through the outlet opening within the support bar; and

(g) a deformable pressure responsive seal having a height greater than the height of the formed gap and disposed within the seal cavity and extending around the dowel passing therethrough, the seal being positioned about the dowel such that the pressure of fluid passing through the dowel into the nozzle cap causes the seal to ride up the dowel and through the gap and abut against the bottom surface of the nozzle cap whereupon the seal is compressed and radially expands and seals the area between the dowel and the outer wall of the seal cavity while assuming a sealing position within the formed gap.

10. A method of point clamping a tool insert with a high pressure chip breaking nozzle cap and sealing a high pressure fluid coupler that passes through a gap formed between the nozzle cap and a supporting tool holder comprising:

(a) point clamping a tool insert to the tool holder so as to define a gap between opposed surfaces of the nozzle cap and tool holder;

(b) connecting a fluid coupler between outlet and inlet openings formed in the opposed surfaces of the nozzle cap and tool holder;

(c) extending the fluid coupler into and through at least one of the openings;

(d) forming a seal cavity with an outer wall about the fluid coupler about the opening that the fluid coupler extends through;

(e) inserting a deformable pressure responsive seal into the seal cavity and around the fluid coupler extending therethrough;

(f) transferring pressurized chip breaking fluid from the tool holder, through the fluid coupler, and into the nozzle cap; and

(g) directing the pressurized chip breaking fluid against the seal and urging the seal from the seal cavity, through the gap, and into engagement with the opposed surface opposite the seal cavity thereby effectively compressing the seal, and maintaining the seal within the gap where the seal is effectively expanded radially and forms a tight seal around the fluid coupler through the entire gap.

11. The method of claim 10 wherein the fluid coupler includes a dowel and the method further includes the step of press fitting one end of the dowel into the inlet opening of the nozzle cap and inserting the other end of the dowel into and through the deformable seal and the seal cavity surrounding the seal.