Air-cooled heat dissipation type ultrasonic knife handle structure

Abstract

An air-cooled heat dissipation type ultrasonic knife handle structure comprises a knife handle body, a stacked transducer assembly and an air-cooled air guide block. The upper end of the cutter handle body is connected with a machine tool spindle. A machine tool spindle center hole channel serves as a cooling gas supply channel. The stacked transducer assembly is arranged at the lower end of the tool handle body, the air cooling air guide block is arranged between the upper end of the stacked transducer assembly and the tool handle body, and the lower end of the stacked transducer assembly is used for being connected with a tool. Cooling gas enters from the upper portion of the knife handle body, sequentially flows through the air cooling gas guide block and the stacked transducer assembly and flows out from the lower portion of the knife handle body. The ultrasonic knife handle can ensure that the transducer is in a reasonable temperature interval under the state of outputting high-power high-frequency ultrasonic vibration for a long time, compared with an existing liquid-cooled structure ultrasonic knife handle, an expensive liquid-cooled main shaft head does not need to be configured, a machine tool main shaft does not need to be greatly changed, an existing standard interface can be continuously used for being connected with the machine tool main shaft in a matched mode, and cost is low. Meanwhile, the structure is simple, the manufacturing difficulty is low, the application cost is low, and the service life is long.

Description

Technical Field

[0001] The invention belongs to the technical field of ultrasonic assisted machining, and in particular relates to an air-cooled heat dissipation type ultrasonic tool handle structure. Background Art

[0002] As a special processing technology, ultrasonic assisted processing technology applies high-frequency ultrasonic vibration to the tool to achieve periodic contact / separation vibration cutting, which can effectively improve the contact form between the tool and the material surface, reduce the friction between the tool and the material surface, and fundamentally change the material removal mechanism. It has the characteristics of reducing cutting force, reducing cutting heat, increasing material removal rate, improving processing accuracy, improving surface integrity, extending tool life, and improving processing stability.

[0003] At present, ultrasonic assisted processing technology has been widely used in the processing of aviation hard and brittle composite materials such as carbon fiber composites, ceramic-based composites, and aramid honeycomb materials. It can greatly improve the processing quality of composite materials, effectively reduce surface damage and strength degradation, and is friendly to the processing environment.

[0004] When the tool is connected to the machine tool spindle using an ultrasonic toolholder of traditional structure, especially when processing hard and brittle composite materials with large and complex curved surface structural features, in order to avoid processing damage such as cutting edge discontinuity, fiber tearing and pulling out, and uneven contours on the workpiece surface, the ultrasonic toolholder usually needs to output high-power and high-frequency ultrasonic vibrations for a long time to meet processing needs.

[0005] However, when the ultrasonic tool handle is operated continuously at high power for a long time, the transducer in the ultrasonic tool handle will experience severe self-heating. The continuous high heat will cause the electrical performance of the piezoelectric ceramic of the transducer to decline rapidly, which will not only affect the piezoelectric effect, but in severe cases may even cause permanent failure of the piezoelectric ceramic material, thereby seriously reducing the service life of the transducer and the surface processing quality of the workpiece. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides an air-cooled and heat-dissipating ultrasonic tool holder structure, which can ensure that the transducer is in a reasonable temperature range when outputting high-power and high-frequency ultrasonic vibration for a long time. Compared with the existing liquid-cooled ultrasonic tool holder, it does not need to be configured with an expensive liquid-cooled spindle head, and the machine tool spindle does not need to be significantly modified. It can use the existing standard interface to cooperate with the machine tool spindle, and has the characteristics of simple structure, low manufacturing difficulty, low application cost and long service life.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an air-cooled and heat-dissipating ultrasonic tool handle structure, comprising a tool handle body, a stacked transducer assembly and an air-cooled air guide block; the upper end of the tool handle body is connected to the machine tool spindle, and the central channel of the machine tool spindle serves as an air supply channel for the cooling gas; the stacked transducer assembly is arranged at the lower end of the tool handle body, the air-cooled air guide block is arranged between the upper end of the stacked transducer assembly and the tool handle body, and the lower end of the stacked transducer assembly is used to connect the tool.

[0008] The tool handle body adopts a cylindrical structure, and the tool handle body comprises, from top to bottom, a machine tool spindle standard interface section, a wireless power supply system receiving ring installation section, a tool change clamping section and a transducer installation section; the interior of the machine tool spindle standard interface section serves as a cooling gas inlet duct; a transverse partition is arranged inside the wireless power supply system receiving ring installation section, a cooling gas inlet hole is opened in the center of the transverse partition, and a threading hole is opened on the side wall of the wireless power supply system receiving ring installation section below the transverse partition; a cooling gas outlet hole is opened on the lower end cylindrical wall of the transducer installation section.

[0009] The air-cooled air guide block adopts a frustum structure, with a conical ventilation hole at the center of the air-cooled air guide block, the small diameter end of the conical ventilation hole faces upward and is connected with the cooling gas inlet hole at the center of the baffle; the upper annular edge of the air-cooled air guide block is processed with a chamfered surface, and an annular wiring cavity is formed between the chamfered surface and the baffle; wiring grooves are symmetrically processed on the lateral surface of the air-cooled air guide block, and the wiring grooves are connected with the annular wiring cavity and the threading hole; threaded adapter holes are evenly processed along the circumferential direction of the small diameter end of the conical ventilation hole on the top of the air-cooled air guide block, and transfer stepped circular holes are evenly processed along the circumferential direction of the cooling gas inlet hole on the baffle, the number of the transfer stepped circular holes and the threaded transfer holes are the same and the positions correspond one to one, and an air guide block transfer screw is installed between the transfer stepped circular holes and the threaded transfer holes.

[0010] The stacked transducer assembly includes a variable amplitude rod, a flange cover, a cylindrical support platform, a piezoelectric ceramic stack, a conductive copper sheet, a clamping plate and a clamping bolt; the variable amplitude rod is fixedly arranged at the center of the lower surface of the flange cover; the cylindrical support platform is fixedly arranged at the center of the upper surface of the flange cover, and the variable amplitude rod, the flange cover and the cylindrical support platform adopt an integrated structure; the piezoelectric ceramic stack is coaxially arranged at the top of the cylindrical support platform, and the conductive copper sheet is arranged on the piezoelectric ceramic stack; the clamping plate is coaxially arranged at the top of the piezoelectric ceramic stack, and both the clamping plate and the piezoelectric ceramic stack are annular structures; the clamping bolt passes through the center holes of the clamping plate and the piezoelectric ceramic stack and is fixedly connected to the center of the top of the cylindrical support platform; a An air inlet channel is connected with the conical ventilation hole at the center of the air-cooled air guide block; an exhaust channel is processed inside the cylindrical support platform, the air inlet of the exhaust channel is connected with the air inlet channel, the air outlet of the exhaust channel is evenly distributed along the circumferential direction, and the exhaust channel is connected with the cooling gas outlet hole opened on the lower end wall of the transducer mounting section; the flange cover is snapped into the lower end of the transducer mounting section, and threaded fastening holes are evenly processed along the circumferential direction on the wall of the transducer mounting section below the cooling gas outlet, and flange cover fastening screws are installed in the threaded fastening holes, and the flange cover is fixedly connected to the wall of the transducer mounting section through the flange cover fastening screws; the tool is threadedly connected to the bottom end of the amplitude transformer.

[0011] A heat sink is arranged along the circumferential direction between the piezoelectric ceramic stack and the inner surface of the cylinder of the handle body, and heat dissipation silica gel is filled between the heat sink and the piezoelectric ceramic stack.

[0012] Beneficial effects of the present invention:

[0013] The air-cooled and heat-dissipating ultrasonic tool handle structure of the present invention can ensure that the transducer is in a reasonable temperature range when outputting high-power and high-frequency ultrasonic vibration for a long time. Compared with the existing liquid-cooled ultrasonic tool handle, it does not need to be configured with an expensive liquid-cooled spindle head, and the machine tool spindle does not need to be significantly modified. It can use the existing standard interface to cooperate with the machine tool spindle for connection. At the same time, it has the characteristics of simple structure, low manufacturing difficulty, low application cost and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of an air-cooled heat dissipation type ultrasonic knife handle structure of the present invention;

[0015] Figure 2 It is a structural schematic diagram of the knife handle body of the present invention;

[0016] Figure 3 It is a structural schematic diagram of a stacked transducer assembly and a tool assembly of the present invention;

[0017] Figure 4It is a structural schematic diagram (cross-sectional view) of the tool handle body and the air-cooling air guide block assembly of the present invention;

[0018] Figure 5 It is a structural schematic diagram of the air-cooled air guide block of the present invention;

[0019] In the figure, I—tool holder body, II—stacked transducer assembly, III—air-cooled air guide block, IV—tool, 1—machine tool spindle standard interface section, 2—wireless power supply system receiving ring installation section, 3—tool change clamping section, 4—transducer installation section, 5—cooling gas inlet duct, 6—cross partition, 7—cooling gas inlet hole, 8—threading hole, 9—cooling gas outlet hole, 10—conical ventilation hole, 11—chamfered surface, 12—circumferential wiring Cavity, 13—wiring groove, 14—threaded adapter hole, 15—adaptation stepped circular hole, 16—gas guide block adapter screw, 17—amplifier, 18—flange cover, 19—cylindrical support platform, 20—piezoelectric ceramic stack, 21—conductive copper sheet, 22—pressure sheet, 23—pressure bolt, 24—air inlet channel, 25—exhaust channel, 26—threaded fastening hole, 27—flange cover fastening screw, 28—heat sink, 29—heat dissipation silicone. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 5 As shown, an air-cooled heat dissipation ultrasonic tool handle structure includes a tool handle body I, a stacked transducer assembly II and an air-cooled air guide block III; the upper end of the tool handle body I is connected to the machine tool spindle, and the central channel of the machine tool spindle serves as an air supply channel for cooling gas; the stacked transducer assembly II is arranged at the lower end of the tool handle body I, the air-cooled air guide block III is arranged between the upper end of the stacked transducer assembly II and the tool handle body I, and the lower end of the stacked transducer assembly II is used to connect to the tool IV.

[0022] The tool handle body I adopts a cylindrical structure, and the tool handle body I comprises, from top to bottom, a machine tool spindle standard interface section 1, a wireless power supply system receiving ring installation section 2, a tool change clamping section 3 and a transducer installation section 4; the interior of the machine tool spindle standard interface section 1 serves as a cooling gas inlet 5; a transverse partition 6 is arranged inside the wireless power supply system receiving ring installation section 2, a cooling gas inlet hole 7 is opened in the center of the transverse partition 6, and a threading hole 8 is opened on the side wall of the wireless power supply system receiving ring installation section 2 below the transverse partition 6; a cooling gas outlet hole 9 is opened on the lower end cylindrical wall of the transducer installation section 4.

[0023] The air-cooled air guide block III adopts a truncated cone structure, and a conical ventilation hole 10 is opened at the center of the air-cooled air guide block III. The small diameter end of the conical ventilation hole 10 faces upward and is connected to the cooling gas inlet hole 7 at the center of the transverse partition 6; the upper circumferential edge of the air-cooled air guide block III is processed with a chamfered surface 11, and an annular wiring cavity 12 is formed between the chamfered surface 11 and the transverse partition 6; the lateral surface of the air-cooled air guide block III is symmetrically processed with wiring grooves 13, and the wiring grooves 1 3 is connected with the annular wiring cavity 12 and the threading hole 8; threaded adapter holes 14 are evenly processed on the top of the air-cooled air guide block III along the circumferential direction of the small diameter end of the tapered ventilation hole 10, and adapter stepped circular holes 15 are evenly processed on the transverse partition 6 along the circumferential direction of the cooling gas inlet hole 7. The number of the adapter stepped circular holes 15 and the threaded adapter holes 14 are the same and the positions correspond one to one, and an air guide block adapter screw 16 is installed between the adapter stepped circular holes 15 and the threaded adapter holes 14.

[0024] The stacked transducer assembly II includes a variable amplitude rod 17, a flange cover 18, a cylindrical support platform 19, a piezoelectric ceramic stack 20, a conductive copper sheet 21, a clamping plate 22 and a clamping bolt 23; the variable amplitude rod 17 is fixedly arranged at the center of the lower surface of the flange cover 18; the cylindrical support platform 19 is fixedly arranged at the center of the upper surface of the flange cover 18, and the variable amplitude rod 17, the flange cover 18 and the cylindrical support platform 19 adopt an integrated structure; the piezoelectric ceramic stack 20 is coaxially arranged at the top of the cylindrical support platform 19, and the conductive copper sheet 21 is arranged on the piezoelectric ceramic stack 20; the clamping plate 22 is coaxially arranged at the top of the piezoelectric ceramic stack 20, and the clamping plate 22 and the piezoelectric ceramic stack 20 are both annular structures; the clamping bolt 23 passes through the center holes of the clamping plate 22 and the piezoelectric ceramic stack 20 and is fixedly connected to the center of the top of the cylindrical support platform 19; An air inlet channel 24 is processed at the center, and the air inlet channel 24 is connected to the conical ventilation hole 10 at the center of the air-cooled air guide block III; an exhaust channel 25 is processed inside the cylindrical support platform 19, and the air inlet of the exhaust channel 25 is connected to the air inlet channel 24, and the air outlet of the exhaust channel 25 is evenly distributed along the circumferential direction, and the exhaust channel 25 is connected to the cooling gas outlet hole 9 opened on the lower end wall of the transducer mounting section 4; the flange cover 18 is snapped into the lower end of the transducer mounting section 4, and threaded fastening holes 26 are evenly processed along the circumferential direction on the wall of the transducer mounting section 4 below the cooling gas outlet hole 9, and flange cover fastening screws 27 are installed in the threaded fastening holes 26, and the flange cover 18 is fixedly connected to the wall of the transducer mounting section 4 through the flange cover fastening screws 27; the tool IV is threadedly connected to the bottom end of the amplitude rod 17.

[0025] A heat sink 28 is provided along the circumferential direction between the piezoelectric ceramic stack 20 and the inner surface of the cylinder of the handle body I, and heat dissipation silica gel 29 is filled between the heat sink 28 and the piezoelectric ceramic stack 20.

[0026] The following describes a one-time use process of the present invention in conjunction with the accompanying drawings:

[0027] In this embodiment, the standard interface section 1 of the machine tool spindle adopts the HSK-A standard interface. When the ultrasonic shank adopts the air-cooled ultrasonic shank structure of the present invention, it is necessary to equip the wireless power supply system receiving ring on the wireless power supply system receiving ring installation section 2, and the wire of the wireless power supply system receiving ring enters the inside of the shank body I through the threading hole 8, and then connects with the conductive copper sheet 21 through the annular wiring cavity 12 and the wiring groove 13, so as to realize the electrical connection between the wireless power supply system receiving ring and the piezoelectric ceramic stack 20. When the wireless power supply system receiving ring is used in conjunction with the wireless power supply system transmitter configured on the machine tool, the wireless power supply of the ultrasonic shank can be realized.

[0028] When in use, first fix the selected tool IV to the bottom end of the amplitude rod 17, and then place the tool IV together with the ultrasonic tool handle on the tool holder. After the workpiece is clamped and fixed on the workbench of the machine tool, the processing program can be started. First, the ultrasonic tool handle with the installed tool IV is moved from the tool holder to the machine tool spindle through the automatic tool changing function of the machine tool, and the ultrasonic tool handle is connected to the machine tool spindle through the standard interface section 1 of the machine tool spindle. Subsequently, cooling gas is introduced into the central channel of the machine tool spindle, and the cooling gas is then discharged from the ultrasonic tool handle through the cooling gas inlet duct 5, the cooling gas inlet hole 7, the conical ventilation hole 10, the air inlet channel 24, the exhaust channel 25 and the cooling gas outlet 9 in sequence.

[0029] When ultrasonic-assisted machining is performed on the workpiece by tool IV, the stacked transducer assembly II will generate heat by itself. At this time, when the cooling gas flows through the air inlet duct 24 and the exhaust duct 25, the cooling gas will exchange heat with the piezoelectric ceramic stack 20 in the stacked transducer assembly II, and most of the heat can be taken away, so that the temperature of the stacked transducer assembly II is always within a reasonable range. At the same time, the heat generated by the piezoelectric ceramic stack 20 can also be partially dissipated with the help of the heat sink 28 and the heat dissipating silica gel 29, thereby further improving the cooling effect.

[0030] The solutions in the embodiments are not intended to limit the protection scope of the present invention. All equivalent implementations or changes that do not deviate from the present invention are included in the protection scope of the present invention.

Claims

1. An air-cooled ultrasonic knife handle structure, characterized in that: It includes a tool handle body, a stacked transducer assembly and an air-cooled air guide block; the upper end of the tool handle body is connected to the machine tool spindle, and the central channel of the machine tool spindle serves as an air supply channel for cooling gas; the stacked transducer assembly is arranged at the lower end of the tool handle body, the air-cooled air guide block is arranged between the upper end of the stacked transducer assembly and the tool handle body, and the lower end of the stacked transducer assembly is used to connect the tool.

2. The air-cooled ultrasonic knife handle structure according to claim 1, characterized in that: The tool handle body adopts a cylindrical structure, and the tool handle body comprises, from top to bottom, a machine tool spindle standard interface section, a wireless power supply system receiving ring installation section, a tool change clamping section and a transducer installation section; the interior of the machine tool spindle standard interface section serves as a cooling gas inlet duct; a transverse partition is arranged inside the wireless power supply system receiving ring installation section, a cooling gas inlet hole is opened in the center of the transverse partition, and a threading hole is opened on the side wall of the wireless power supply system receiving ring installation section below the transverse partition; a cooling gas outlet hole is opened on the lower end cylindrical wall of the transducer installation section.

3. The air-cooled ultrasonic knife handle structure according to claim 2, characterized in that: The air-cooled air guide block adopts a frustum structure, with a conical ventilation hole at the center of the air-cooled air guide block, the small diameter end of the conical ventilation hole faces upward and is connected with the cooling gas inlet hole at the center of the baffle; the upper annular edge of the air-cooled air guide block is processed with a chamfered surface, and an annular wiring cavity is formed between the chamfered surface and the baffle; wiring grooves are symmetrically processed on the lateral surface of the air-cooled air guide block, and the wiring grooves are connected with the annular wiring cavity and the threading hole; threaded adapter holes are evenly processed along the circumferential direction of the small diameter end of the conical ventilation hole on the top of the air-cooled air guide block, and transfer stepped circular holes are evenly processed along the circumferential direction of the cooling gas inlet hole on the baffle, the number of the transfer stepped circular holes and the threaded transfer holes are the same and the positions correspond one to one, and an air guide block transfer screw is installed between the transfer stepped circular holes and the threaded transfer holes.

4. The air-cooled heat dissipation ultrasonic knife handle structure according to claim 3, characterized in that: The stacked transducer assembly includes a variable amplitude rod, a flange cover, a cylindrical support platform, a piezoelectric ceramic stack, a conductive copper sheet, a clamping plate and a clamping bolt; the variable amplitude rod is fixedly arranged at the center of the lower surface of the flange cover; the cylindrical support platform is fixedly arranged at the center of the upper surface of the flange cover, and the variable amplitude rod, the flange cover and the cylindrical support platform adopt an integrated structure; the piezoelectric ceramic stack is coaxially arranged at the top of the cylindrical support platform, and the conductive copper sheet is arranged on the piezoelectric ceramic stack; the clamping plate is coaxially arranged at the top of the piezoelectric ceramic stack, and both the clamping plate and the piezoelectric ceramic stack are annular structures; the clamping bolt passes through the center holes of the clamping plate and the piezoelectric ceramic stack and is fixedly connected to the center of the top of the cylindrical support platform; a An air inlet channel is connected with the conical ventilation hole at the center of the air-cooled air guide block; an exhaust channel is processed inside the cylindrical support platform, the air inlet of the exhaust channel is connected with the air inlet channel, the air outlet of the exhaust channel is evenly distributed along the circumferential direction, and the exhaust channel is connected with the cooling gas outlet hole opened on the lower end wall of the transducer mounting section; the flange cover is snapped into the lower end of the transducer mounting section, and threaded fastening holes are evenly processed along the circumferential direction on the wall of the transducer mounting section below the cooling gas outlet, and flange cover fastening screws are installed in the threaded fastening holes, and the flange cover is fixedly connected to the wall of the transducer mounting section through the flange cover fastening screws; the tool is threadedly connected to the bottom end of the amplitude transformer.

5. The air-cooled heat dissipation ultrasonic knife handle structure according to claim 4, characterized in that: A heat sink is arranged along the circumferential direction between the piezoelectric ceramic stack and the inner surface of the cylinder of the handle body, and heat dissipation silica gel is filled between the heat sink and the piezoelectric ceramic stack.

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