Composite metal rotary horn

Abstract

To provide a composite metal rotary horn which can be repeatedly used at low cost while achieving performance required for a rotary horn at a high level on the other hand.SOLUTION: A rotary horn 10 used for an ultrasonic deposition machine, a cutting machine and so on comprises: a disk part 120 which is molded into a disk shape, directly contacts a work-piece and functions; a shank 130 which supports the disk part. The disk part 120 and the shank 130 are configured from separate members, a metal material constituting the disk part 120 has a specific gravity lighter than a metal material constituting the shank 130 and has a heat conductivity higher than the same, and further, an open hole 122 is provided at a center of the disk part 120, and a tip of the shank 130 is coupled to the open hole 122 by shrink fit.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a rotary horn for use in ultrasonic welding and cutting machines. [Background technology]

[0002] 2. Description of the Related Art Conventionally, rotary horns have been widely used in ultrasonic welding machines and the like for the purpose of realizing continuous welding (sealing) and cutting (see Patent Document 1).

[0003] An example of a rotary horn that has been used conventionally, including that described in Patent Document 1, is shown in Figure 5. Rotary horn 10 transmits vibrations from a vibration generating unit (not shown) to a workpiece while rotating, so it is necessary to strictly control the misalignment (misalignment of the axis) between disk unit 20 and shaft unit 30. For this reason, rotary horn 10 is constructed by being integrally molded by machining.

[0004] Furthermore, since the rotary horn operates under a constant vibration generated by the vibrator, a material that is resistant to metal fatigue is suitable. Light materials are also desirable from the viewpoint of reducing the energy required for amplitude. Furthermore, since the rotary horn in particular changes the direction of vibration (the vertical amplitude of the shaft portion 30 is converted into the circumferential amplitude of the disk portion 20), heat is generated near the center of the disk portion. Therefore, a material with excellent heat dissipation properties is desirable. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-111713 A Summary of the Invention [Problem to be solved by the invention]

[0006] As mentioned above, rotary horns are required to have various performance characteristics from various aspects, but it is very difficult to meet all of these performance characteristics when they are manufactured by cutting the entire horn from a specific material, as in the past. Also, using a material that meets these requirements at a high level (such as titanium) would result in very high costs (especially in the case of one-piece cutting, the amount of cutting is large due to the shape of the rotating horn, and there are many processing steps, so not only the material cost but also the processing cost is inevitably high).

[0007] The present invention has been made to solve these problems, and its object is to provide a rotary horn that achieves the performance required of a rotary horn at a high level in other respects, while being low-cost and can be used repeatedly. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a rotary horn for use in ultrasonic welding machines, cutting machines, etc., comprising a disk portion that is formed into a disk shape and functions by directly contacting the workpiece, and a shaft portion that supports the disk portion, wherein the disk portion and the shaft portion are constructed as separate members, the metal material constituting the disk portion is constructed of a metal material that has a lower specific gravity and higher thermal conductivity than the metal material constituting the shaft portion, and further characterized in that a through hole is provided in the center of the disk portion, and the tip of the shaft portion is joined to the through hole by shrink fitting.

[0009] This configuration makes it possible to achieve a high level of performance required of a rotary horn in other respects. In other words, by constructing the disk section, where the amplitude is the largest, from a lightweight metal material, a rotary horn with good energy efficiency can be realized. In addition, because it has excellent heat dissipation properties, the heat generated near the center of the disk section can be efficiently propagated and dissipated. Furthermore, because the shaft section and disk section can be machined separately, the amount of cutting required is small, eliminating waste of metal material and achieving low costs. In addition, because the two are joined together by a simple mechanism known as shrink fitting, misalignment between the shaft section and disk section is unlikely to occur.

[0010] Furthermore, the metal material constituting the disk portion is characterized in having a coefficient of thermal expansion greater than that of the metal material constituting the shaft portion.

[0011] This configuration makes it possible to provide a rotary horn that can be used repeatedly. In other words, the disk part can be removed by reheating the shrink-fit joint, realizing a rotary horn that can be used sustainably at low cost by replacing only the worn or damaged disk part.

[0012] In addition, a cooling groove may be formed inside the disk portion for flowing a continuous refrigerant from the inner surface of the through hole, and a refrigerant passage may be formed inside the shaft portion which opens to the portion which engages with the inner surface, and the disk portion may be cooled by the refrigerant.

[0013] This configuration allows for more efficient cooling of the disk portion, improves the machining accuracy of the workpiece, and prevents deterioration of the material due to heat generation.

[0014] In addition, the cooling grooves of the disk portion may be provided radially from the inner surface of the through hole toward the radial direction of the disk portion, and the coolant may be configured to flow in one direction from the shaft portion to the disk portion.

[0015] With this configuration, cooling can be achieved by blowing a coolant (such as air) from the shaft portion through the disk portion to the outside, so that the cooling mechanism can be realized with a simple configuration.

[0016] The cooling groove of the disk portion may be formed in an approximately donut shape from the inner surface of the through hole within the disk portion, and the refrigerant may be configured to circulate from the shaft portion through the cooling groove and back to the shaft portion.

[0017] With this configuration, a liquid refrigerant with high thermal efficiency can be used, so that the cooling efficiency is improved dramatically. Effect of the Invention

[0018] By applying the present invention, it is possible to provide a rotary horn that achieves the performance required of a rotary horn at a high level in other respects, while being low-cost and repeatedly usable. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is an exploded perspective view of a composite metal rotary horn according to an embodiment of the present invention. [Diagram 2] 1A is a cross-sectional view of a disk portion of a first embodiment of a composite metal rotary horn, FIG. 1B is a longitudinal cross-sectional view of the disk portion of the first embodiment, and FIG. 1C is a longitudinal cross-sectional view of a shaft portion of the first embodiment. [Diagram 3] 10A is a cross-sectional view of the disk portion, FIG. 10B is a longitudinal cross-sectional view of the disk portion, and FIG. 10C is a longitudinal cross-sectional view of the shaft portion, showing a second embodiment of the composite metal rotary horn. [Figure 4] 13A to 13C are diagrams showing a third embodiment of a composite metal rotary horn, in which (a) is a horizontal cross-sectional view of a disk portion, (b) is a vertical cross-sectional view of the disk portion, and (c) is a vertical cross-sectional view of a shaft portion. [Diagram 5] FIG. 1 is an overall perspective view of a conventional rotary horn. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Below, a composite metal rotary horn 100, which is an example of an embodiment of the present invention, will be described with reference to the attached drawings. Note that in order to make the drawings easier to understand, some parts are exaggerated in size and dimensions, and some parts do not necessarily match the actual product. Each drawing should be viewed according to the direction of the symbols, and the directions are expressed as up, down, left, right, front, and back based on the directions.

[0021] (Configuration of composite metal rotary horn (first embodiment)) As shown in FIG. 1 and FIG. 2, the composite metal rotary horn 100 shown as the first embodiment of the present invention is made up of a disk part 120 formed in a disk shape and functioning by directly contacting the workpiece, and a shaft part 130 supporting the disk part 120, which are separate members. The metal material constituting the disk part is a metal material having a lower specific gravity and a higher thermal conductivity than the metal material constituting the shaft part. For example, when the shaft part 130 is made of steel or titanium, the disk part 120 is made of an aluminum alloy. Of course, the material to be selected is not limited to this pattern. Furthermore, a through hole 122 is provided in the center of the disk part 120, and the tip of the shaft part 130 is joined to the through hole 122 by shrink fitting. The reference numeral 132 denotes a rotation support part used when rotating the composite metal rotary horn 100. The reference numeral 50 denotes a vibrator connected to the base end side of the shaft part 130 to generate vibration.

[0022] (Configuration of composite metal rotary horn (second embodiment)) 3, the composite metal rotary horn of the second embodiment has a structure that allows forcible cooling of the disk portion 220 by a refrigerant. Note that parts that are the same as or similar to those of the first embodiment are given reference numerals with the same last two digits, and duplicated explanations will be omitted.

[0023] In the disk part 220 of the composite metal rotary horn as the second embodiment, four cooling grooves 224 are formed radially from the inner peripheral surface of the through hole 222 toward the outside in the radial direction. The cooling grooves 224 are open to the outer peripheral surface of the disk part 220. A coolant passage 236 for passing a coolant is also formed in the shaft part 230 in the axial direction. The coolant passage 236 is connected to a coolant supply part 238 to which a coolant (e.g., air) is supplied from the outside at the lower part. The upper part of the coolant passage 236 is connected to a groove 234 formed on the outer peripheral surface of the shaft part 230 all around. The groove 234 is formed in a part of the shaft part 230 that fits into the "inner peripheral surface of the through hole 222 of the disk part 220" and is further formed at a position that communicates with the cooling groove 224 formed in the disk part 220 when fitted.

[0024] (Configuration of composite metal rotary horn (third embodiment)) 4, the composite metal rotary horn of the third embodiment has a structure that allows forcible cooling of the disk portion 320 by a refrigerant. Note that parts that are the same as or similar to those of the first embodiment are given reference numerals with the same last two digits, and duplicated explanations will be omitted.

[0025] In the disk part 320 of the composite metal rotary horn as the third embodiment, a cooling groove 324 having a substantially doughnut shape is formed from the inner peripheral surface of the through hole 322 toward the radially outward direction. This cooling groove 324 is not open to the outer peripheral surface of the disk part 320. In addition, two refrigerant passages 336 for passing a refrigerant are formed in the axial direction in the shaft part 330. The refrigerant passages 336 are connected at the lower part to a refrigerant supply part 338a to which a refrigerant (e.g., cooling water) is supplied from the outside, and to a refrigerant recovery part 338b to which the refrigerant is recovered. The upper part of the refrigerant passages 336 is open to the outer peripheral surface 334 of the shaft part 330. This part (the part where the outer peripheral surface 334 of the shaft part 330 is open) is formed in a part of the shaft part 330 that fits into the "inner peripheral surface of the through hole 322 of the disk part 320", and is further formed in a position that communicates with the cooling groove 324 formed in the disk part 320 when fitted.

[0026] As described above, the present invention is a rotary horn for use in ultrasonic welding machines, cutting machines, etc., and comprises a disk portion 120 that is formed into a disk shape and functions by directly contacting the workpiece, and a shaft portion 130 that supports the disk portion, wherein the disk portion 120 and the shaft portion 130 are constructed as separate members, the metal material constituting the disk portion 120 is constructed of a metal material that has a lower specific gravity and higher thermal conductivity than the metal material constituting the shaft portion 130, and further, a through hole 122 is provided in the center of the disk portion 120, and the tip of the shaft portion 130 is joined to the through hole 122 by shrink fitting.

[0027] By configuring it in this way, it has become possible to realize the performance required for a rotary horn at a high level in other aspects. That is, by configuring the disk part 120, which has the largest amplitude width, from a lightweight metal material, a rotary horn with good energy efficiency can be realized. In addition, since it has excellent heat dissipation properties, the heat generated near the center of the disk part 120 can be efficiently propagated and dissipated. Furthermore, since the shaft part 130 and the disk part 120 can be cut out separately, the amount of cutting is small, and it is possible to eliminate waste of metal material and achieve low costs. In addition, since the two are joined by a simple mechanism called shrink fitting, misalignment between the shaft part 130 and the disk part 120 is unlikely to occur.

[0028] Furthermore, the metal material constituting the disk portion 120 is characterized by having a coefficient of thermal expansion greater than that of the metal material constituting the shaft portion 130 .

[0029] This configuration makes it possible to provide a rotary horn that can be used repeatedly. In other words, the part joined by shrink fitting can be heated again to remove the disk part 120, so that only the worn or damaged disk part 120 can be replaced, realizing a rotary horn that can be used sustainably at low cost.

[0030] In addition, a cooling groove 224 for flowing a refrigerant that continues from the inner circumferential surface of through hole 222 may be formed inside disk portion 220, and a refrigerant passage 236 that opens to the portion that fits into the inner circumferential surface of through hole 222 may be formed inside shaft portion 230, so that disk portion 220 is cooled by the refrigerant.

[0031] Such a configuration allows for more efficient cooling of the disk portion 220, improves the machining accuracy of the workpiece, and prevents deterioration of the material due to heat generation.

[0032] In addition, the cooling grooves 224 of the disk portion 220 may be provided radially from the inner surface of the through hole 222 toward the radial direction of the disk portion 220, and the coolant may be configured to flow in one direction from the shaft portion 230 to the disk portion 220.

[0033] With this configuration, cooling can be achieved by blowing a coolant (eg, air) from shaft portion 230 through disk portion 220 to the outside, so that the cooling mechanism can be realized with a simple configuration.

[0034] In addition, the cooling groove 334 of the disk portion 330 may be formed in a roughly donut shape from the inner circumferential surface of the through hole 322 inside the disk portion 320, and the refrigerant may be configured to circulate from the shaft portion 330 through the cooling groove 334 and back to the shaft portion 330 side.

[0035] With this configuration, a liquid refrigerant with high thermal efficiency can be used, so that the cooling efficiency is improved dramatically. [Explanation of symbols]

[0036] 50···Transducer 100···Composite metal rotary horn 120...Disc section 122...Through hole 130... Shaft 132 Rotation support part 224...Cooling groove 234... Refrigerant connection 236... Refrigerant passage 238... Refrigerant supply section

Claims

1. A rotary horn for use in ultrasonic welding machines, cutting machines, etc. A disk part that is formed into a disk shape and functions by directly contacting the workpiece; A shaft portion supporting the disk portion, The disk portion and the shaft portion are formed of separate members, and the metal material forming the disk portion is formed of a metal material having a lower specific gravity and a higher thermal conductivity than the metal material forming the shaft portion, Furthermore, a through hole is provided in the center of the disk portion, and the tip of the shaft portion is joined to the through hole by shrink fitting.

1. A composite metal rotary horn comprising:

2. In claim 1, Furthermore, the metal material constituting the disk portion has a higher thermal expansion coefficient than the metal material constituting the shaft portion.

1. A composite metal rotary horn comprising:

3. In claim 1 or 2, a cooling groove is formed inside the disk portion for allowing a coolant to flow continuously from an inner peripheral surface of the through hole; a refrigerant passage is formed inside the shaft portion, the refrigerant passage being open to a portion where the shaft portion fits with the inner circumferential surface; The disk portion is cooled by the refrigerant.

1. A composite metal rotary horn comprising:

4. In claim 3, The cooling grooves of the disk portion are provided radially from an inner circumferential surface of the through hole toward a radial direction of the disk portion, The coolant flows in one direction from the shaft portion to the disk portion.

1. A composite metal rotary horn comprising:

5. In claim 3, The cooling groove of the disk portion is formed in a substantially doughnut shape from an inner circumferential surface of the through hole into the disk portion, The coolant flows from the shaft portion through the cooling groove and is returned to the shaft portion again to circulate.

1. A composite metal rotary horn comprising:

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