JP4861038B2 - Adapter, adapter cooling method and friction stir welding method - Google Patents

Description

  The present invention relates to an adapter, a method for cooling the adapter, and a friction stir welding method.

  Friction that attaches a tool with a protrusion at the tip to the holder of a processing machine and presses it against the abutting part of the material to be joined, stirs and assimilates the plastic fluidized material by frictional heat Stir welding methods are known. In such a friction stir welding method, when a high melting point material such as an iron-based material or a titanium alloy is used as a joining target, the temperature around the tool becomes, for example, about 1000 to 1200 ° C., and this heat is transferred to the tool side. May be transmitted to the holder side of the processing machine, and the processing machine may be damaged.

Here, various technologies for cooling or radiating heat generated in a processing machine or suppressing heat transfer have been proposed in the following patent documents. Patent Document 1 discloses a technique for flowing a refrigerant to a spindle of a processing machine. Patent Document 2 discloses a technique for flowing a refrigerant into a tool and a technique for spraying a mist-like coolant on the tool. Patent Document 3 discloses a technique in which fins are provided on the outer periphery of a tool. Patent Document 4 discloses a technique in which a heat insulating groove is provided on the outer periphery of a holder attached to a spindle. Patent Document 5 discloses a technique for flowing a coolant through a holder on which a tool is mounted.
JP 2001-204559 A JP-A-10-52770 JP 2002-153977 A Japanese Patent Laid-Open No. 2001-300828 JP 2002-096241 A

  However, the technique of flowing a coolant to the spindle of Patent Document 1 has little influence of heat on the processing machine body when a low-melting-point material such as aluminum is used as a joining target, and therefore, to reduce running costs. Although it is required not to flow the refrigerant, parts such as bearings and packing may be damaged due to the heat on the tool side if the refrigerant is not flowed, and replacement with a spindle housing that does not conduct the refrigerant is not realistic. .

  Moreover, since the technique of flowing a refrigerant | coolant to the tool of patent document 2 has a small tool, its cooling efficiency is bad, and since it is necessary to provide the channel | path which flows a refrigerant | coolant in a small tool, manufacture is difficult. Moreover, since the technique of spraying a mist-like coolant on the tool of patent document 2 is small, cooling efficiency is bad.

  Moreover, since the technique which provides a fin on the outer periphery of the tool of patent document 3 has a small tool, cooling efficiency is bad and manufacture is difficult.

  Moreover, the technique of providing the groove | channel for heat insulation in the taper-shaped outer periphery of the holder of patent document 4 has a possibility that a tool may heat up and a tool may deteriorate. There is also a problem that the surface pressure of the contact portion between the spindle and the holder increases.

  Further, in the technique of flowing a refrigerant through the holder of Patent Document 5, when a low melting point material such as aluminum is used as a joining target, the influence of heat on the processing machine main body is small, and therefore the running cost is reduced. However, if the coolant is not flowed in this manner, components such as bearings and packing provided on the holder side may be damaged due to heat on the tool side. Therefore, it is necessary to replace with a general-purpose holder not provided with such parts, but the holder is heavy and needs to be fitted into the spindle / must be fitted, and the workability at the time of replacement is poor. There is.

  The above-mentioned various problems are particularly remarkable when friction stir welding is performed on a high-melting-point material, but may also occur when machining is performed.

The present invention has been made to solve such a problem, and is provided between a tool and a holder, and can prevent a thermal influence on a processing machine during friction stir welding. An adapter that is easy to manufacture, can eliminate the risk of tool deterioration, and can use a general-purpose holder, a cooling method for the adapter, and a friction stir welding method are provided. The purpose is to do.

The adapter according to the present invention is used for a processing machine that performs friction stir welding using a tool, and one end side can be removably attached to the tool, and the other end side can be removably attached to a holder of the processing machine. An adapter comprising cooling means for cooling heat transmitted from a tool side to a holder side of a processing machine.

  According to the present invention, the adapter is attached between the tool and the holder, and heat transmitted from the tool side to the holder side of the processing machine is cooled by the adapter. This adapter is larger than the tool because it is equipped with a tool, and since this adapter cools the heat, it is possible to increase the cooling efficiency compared to cooling the tool. It is possible to prevent the influence of heat on the machine. Moreover, since it is larger than a tool in this way, manufacture is facilitated. In addition, since the heat is cooled by the adapter between the holder and the tool in this way, the heat is not trapped on the tool side, and the possibility of deterioration of the tool can be eliminated and a general-purpose holder can be used. It is said. Since the adapter is attached to the holder, it is smaller and lighter than the holder, and can be easily attached to and detached from the holder, so that the workability when replacing the adapter is good.

Various examples of the cooling means may be mentioned. Specifically, a configuration including a heat radiating fin is preferable. When such a configuration is adopted, the heat transmitted from the tool side to the holder side of the processing machine is effectively obtained by the heat stir welding by the processing machine and the formation of the air flow by the heat radiation by the heat radiation fin and the rotation of the heat radiation fin. To be cooled.

Moreover, the structure provided with the channel | path for flowing a refrigerant | coolant as a cooling means is also mentioned. When such a configuration is adopted, the heat transmitted from the tool side to the holder side of the processing machine is effectively cooled by flowing the coolant through the passage at the time of friction stir welding by the processing machine. Here, it is preferable to employ a swivel joint for connection between the passage through which the refrigerant on the rotating side flows and the refrigerant source side on the stationary side.

The adapter cooling method according to the present invention uses the above adapter, and when the tool is attached to one end of the adapter and the other end of the adapter is attached to the holder and the friction stir welding is performed by the processing machine, A coolant is sprayed to cool the heat transmitted from the tool side to the holder side of the processing machine.

According to such a cooling method for the adapter, the coolant is sprayed onto the adapter to cool the heat transmitted from the tool side to the holder side of the processing machine. Since this adapter is larger than the tool as described above, it has a higher cooling efficiency than the conventional technique in which a mist-like coolant is sprayed on the tool, and the heat effect on the processing machine during friction stir welding is effectively reduced. In addition to being prevented, heat is cooled by the adapter between the holder and the tool, so that heat is not trapped on the tool side, there is no risk of deterioration of the tool, and a general-purpose holder can be used.

  The friction stir welding method according to the present invention is characterized in that the adapter is used, a tool is mounted on one end side of the adapter, and the other end side of the adapter is mounted on a holder and friction stir welding is performed by a processing machine. .

  According to such a friction stir welding method, it is possible to perform friction stir welding that prevents the influence of heat on the processing machine, prevents the deterioration of the tool, and enables the use of a general-purpose holder.

As described above, according to the adapter of the present invention, it is possible to prevent the influence of heat on the processing machine at the time of friction stir welding, it is easy to manufacture, and the possibility of deterioration of the tool can be eliminated. In addition, a general-purpose holder can be used. In addition, according to the present invention, it is possible to provide a method for cooling an adapter and a friction stir welding method that can prevent the influence of heat on the processing machine, have no risk of tool deterioration, and can use a general-purpose holder.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an adapter, an adapter cooling method, and a friction stir welding method according to the present invention will be described with reference to FIGS. Note that, in each drawing, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a perspective view showing a state in which a tool is mounted on an adapter according to the first embodiment of the present invention and the adapter is mounted on a holder. FIG. 2 is an exploded perspective view of FIG. Is used for a processing machine that performs friction stir welding, and is particularly effective when the object to be joined is a high melting point material such as an iron-based material or a titanium alloy.

  As shown in FIG. 2, the adapter 1 is configured in a substantially stepped columnar shape, and has a large diameter portion 1a at the center in the axial direction, a medium diameter portion 1b on the lower side (one end side) of the large diameter portion 1a, and a large diameter portion 1b. A small-diameter portion 1c on the upper side (the other end side) of the drawing is provided from the diameter portion 1a.

  The large-diameter portion 1a and the medium-diameter portion 1b are provided with mounting holes (not shown) opened from the end face of the medium-diameter portion 1b for detachably mounting the tool (tool) 2. The small-diameter portion 1c is provided to be detachably attached to a general-purpose holder 3 such as a milling chuck attached to a processing machine that performs friction stir welding.

  A large number of annular radiating fins 1d are provided on the outer peripheral surfaces of the large-diameter portion 1a and the medium-diameter portion 1b so as to be spaced apart from each other in the axial direction. The heat dissipating fin 1d constitutes a cooling means for cooling the heat transmitted from the tool 2 side to the holder 3 side.

  When the friction stir welding is performed by the processing machine, the tool 2 is inserted into the mounting hole of the adapter 1 and detachably attached to the adapter 1 as shown in FIG. It is inserted into the mounting hole 3a (see FIG. 2) and is detachably attached to the holder 3.

  Therefore, at the time of friction stir welding, heat is dissipated by the heat dissipating fins 1d and an air flow is formed by the rotation of the heat dissipating fins 1d, and the heat transmitted from the tool 2 side to the holder 3 side is effectively cooled.

  Thus, since the adapter 1 is mounted with the tool 2 and is larger than the tool 2, the heat is cooled by the heat radiating fins 1d provided on the adapter 1, so that the tool 2 is provided with heat radiating fins and refrigerant passages. The cooling efficiency is increased as compared with the conventional technology for cooling, and the thermal influence on the processing machine during friction stir welding is prevented. Further, since the adapter 1 is larger than the tool 2 as described above, the manufacture is facilitated as compared with the conventional technique in which the tool 2 is cooled by providing a heat radiating fin or a refrigerant passage. Further, since the heat is cooled by the adapter 1 between the holder 3 and the tool 2 in this manner, the heat is not trapped on the tool 2 side, there is no possibility of deterioration of the tool 2, and the general-purpose holder 3 can be used. It is said that. Further, the problem of surface pressure described in the prior art is also eliminated.

  Therefore, according to the friction stir welding method of the present invention, the influence of heat on the processing machine is prevented, the tool 2 is not deteriorated, and the general-purpose holder 3 can be used.

  FIG. 3 is an exploded perspective view showing a tool attached to the adapter according to the second embodiment of the present invention and the holder. The difference between the adapter 11 of the second embodiment and the adapter 1 of the first embodiment is that a flat plate-like heat radiation fin 11d is used instead of the annular heat radiation fin 1d. The heat dissipating fins 11d are rectangular flat plates extending in the axial direction, and are provided so that a large number are spaced apart in the circumferential direction from the outer peripheral surfaces of the large diameter portion 1a and the medium diameter portion 1b. .

  Needless to say, even in such a second embodiment, the same actions and effects as in the first embodiment can be achieved.

  FIG. 4 is an exploded perspective view showing a tool attached to the adapter according to the third embodiment of the present invention and the holder. The difference between the adapter 21 of the third embodiment and the adapter 11 of the second embodiment is that a large number of spiral radiating fins 21d are arranged in the circumferential direction instead of the flat radiating fins 11d on the outer peripheral surface of the large-diameter portion 1a. Are provided so as to be spaced apart from each other.

  Needless to say, even in the third embodiment, the same actions and effects as those in the second embodiment can be achieved.

Moreover, in the said embodiment, as a cooling means for cooling the heat | fever transmitted from the tool 2 side to the holder 3 side of a processing machine, the structure provided with the radiation fins 1d, 11d, and 21d is mentioned as being especially effective. However, it may be configured to include a passage for flowing the refrigerant. This refrigerant is a cooling liquid such as cooling water, a cooling gas, or the like. Even in an adapter having a passage for flowing such a refrigerant, the adapter is larger than the tool 2 because the adapter 2 is attached to the adapter, and heat is generated by flowing the refrigerant through the refrigerant passage provided in the adapter. Therefore, the cooling efficiency is improved as compared with the conventional technique in which the tool is cooled by providing heat radiation fins or refrigerant passages, and the thermal influence on the processing machine during friction stir welding is prevented. Further, since the adapter is larger than the tool 2 as described above, the manufacture is facilitated as compared with the conventional technique in which the tool 2 is cooled by providing a heat radiating fin or a refrigerant passage. In addition, since the heat is cooled by the adapter between the holder 3 and the tool 2 in this way, heat is not trapped on the tool 2 side, there is no possibility of deterioration of the tool 2, and the general-purpose holder 3 can be used. Has been. Further, the problem of surface pressure described in the prior art is also eliminated. Therefore, according to the friction stir welding by the processing machine using the adapter having the refrigerant passage, the thermal influence on the processing machine is prevented, the tool 2 is not deteriorated, and the general-purpose holder 3 can be used. The Here, it is preferable to employ a swivel joint for connection between the passage through which the refrigerant on the rotating side flows and the refrigerant source side on the stationary side. The passage for flowing the refrigerant may be provided instead of the radiation fins 1d, 11d, and 21d, or may be provided together with the radiation fins 1d, 11d, and 21d. Since the adapter is attached to the holder 3, it is smaller and lighter than the holder 3, and is easy to attach to and detach from the holder 3. Therefore, the workability when exchanging the adapter is good.

Moreover, when performing friction stir welding by a processing machine using the said adapter, you may make it cool a heat | fever transmitted from the tool 2 side to the holder 3 side of a processing machine by spraying a refrigerant | coolant to an adapter. Since this adapter is larger than the tool 2 as described above, the cooling efficiency is higher than that of the conventional technique in which a mist-like coolant is sprayed on the tool, and the heat influence on the processing machine at the time of friction stir welding is effective. Since the heat is cooled by the adapter between the holder 3 and the tool 2, the heat is not trapped on the tool 2 side, there is no possibility of deterioration of the tool 2, and the general-purpose holder 3 can be used. It is said. The coolant spraying on the adapter may be performed on the adapters 1, 11, and 21 having the radiation fins 1 d, 11 d, and 21 d, and may be performed on the adapter in which the coolant flows in the passage, You may carry out with respect to the adapter which has a radiation fin 1d, 11d, 21d, and a refrigerant | coolant flows into a channel | path, and may be performed with respect to the adapter which does not have a radiation fin and a refrigerant channel.

It is a perspective view which shows the state which mounted | wore the adapter and attached the said adapter to the holder which concerns on the adapter which concerns on 1st embodiment of this invention. FIG. 2 is an exploded perspective view of FIG. 1. It is a disassembled perspective view which attaches a tool to the adapter which concerns on 2nd embodiment of this invention, and shows with a holder. It is a disassembled perspective view which attaches a tool to the adapter which concerns on 3rd embodiment of this invention, and shows with a holder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11, 21 ... Adapter, 1b ... One end side, 1c ... Other end side, 1d, 11d, 21d ... Radiation fin (cooling means), 2 ... Tool, 3 ... Holder.

Claims (5)

Used for processing machines that perform friction stir welding using tools,
One end side can be detachably attached to the tool, and the other end side can be detachably attached to the holder of the processing machine.
An adapter comprising cooling means for cooling heat transmitted from the tool side to the holder side of the processing machine. The cooling means according to claim 1, wherein the adapter further comprising a radiation fin. The cooling means according to claim 1, wherein the adapter, characterized in that it comprises a passage for the flow of coolant. The adapter according to any one of claims 1 to 3 , wherein the tool is attached to one end side of the adapter and the other end side of the adapter is attached to the holder to perform friction stir welding by the processing machine. When doing
A cooling method for an adapter, wherein a coolant is sprayed on the adapter to cool heat transmitted from the tool side to a holder side of the processing machine. The adapter according to any one of claims 1 to 3 , wherein the tool is mounted on one end side of the adapter and the other end side of the adapter is mounted on the holder, and friction stir welding is performed by the processing machine. The friction stir welding method characterized by performing.

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