JP2018051564A - Rotary tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary tool which generates plastic flow with good efficiency and can obtain a sound junction.SOLUTION: A rotary tool 10 comprises a first split member 20, and a second split member 30 which is fitted into a hollow part 22 of the first split member 20. The first split member 20 has a first hollow part 23, and a second hollow part 24. The second split member 30 has a shank 32, and a pedestal part 33. The second split member 30 is combined with the first split member 20 so that a probe part 31 projects to a shoulder part 21 side from the first hollow part 23 by engaging a male screw part 32a of the shank 32 with a female screw part 24b of the second hollow part 24. The pedestal part 33 contacts a base end surface 20a of the first split member 20, and consequently, a projection amount of the probe part 31 from the first hollow part 23 is regulated. A groove 15 is provided over at least the whole peripheral surface of a projection portion of the probe part 31.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotating tool.

  Friction stir welding (FSW) is known as one method for joining metal materials. In the friction stir welding, a rotating tool is pushed into a contact portion between metal materials and rotated, and the metal materials softened by friction heat are integrated by plastic flow.

  As a rotary tool used for friction stir welding, for example, there is a rotary tool described in Patent Document 1. This conventional rotary tool includes a probe portion that is pushed into a contact portion between metal materials at the time of joining, and a shoulder portion that is provided in an annular shape so as to surround the probe portion. On the outer surface of the probe portion, a groove for promoting stirring of the fluidized metal material is formed.

Japanese Patent No. 5148169

  In the rotary tool as described above, the probe portion and the shoulder portion are generally formed integrally. In this case, since the groove processing tool interferes with the shoulder portion, it is difficult to form a groove in the proximal end portion of the probe portion. However, in order to improve the stirrability of the metal material and efficiently generate the plastic flow, it is preferable that a groove is formed over the entire protruding portion of the probe portion from the shoulder portion. Further, in the rotating tool as described above, it is extremely important that the protruding amount of the probe portion is a target size in order to secure a processing accuracy and obtain a sound joint portion.

  Then, an object of this invention is to provide the rotation tool which can produce a plastic flow efficiently and can obtain a healthy joint part.

  A rotary tool according to one aspect of the present invention is provided in an annular shape so as to surround a probe portion having a diameter smaller than that of the main body portion and having a groove formed on a peripheral surface thereof at a front end surface of the cylindrical main body portion. A rotating tool for friction stir welding comprising a shoulder portion, a cylindrical first divided member having a shoulder portion provided on a tip surface side, and a probe portion provided on a tip surface side, A second split member that fits into the hollow portion of the first split member, and the first split member has a first hollow portion provided on the shoulder portion side with an inner diameter through which the probe portion is inserted, A second hollow member having a diameter larger than that of the first hollow portion and communicating with the proximal end side of the first hollow portion and having a female screw portion provided on the inner peripheral surface thereof. Is provided on the proximal end side of the probe portion with an outer diameter corresponding to the inner diameter of the second hollow portion, and an outer peripheral surface A body portion provided with a male screw portion, and a pedestal portion provided on the proximal end side of the body portion with an outer diameter corresponding to the outer diameter of the first divided member, and the second divided member is By screwing the male screw portion of the body portion into the female screw portion of the second hollow portion, the probe portion is coupled to the first split member so that the probe portion projects from the first hollow portion toward the shoulder portion, The portion abuts against the base end surface of the first split member to define the protruding amount of the probe portion from the first hollow portion, and a groove is provided at least over the entire peripheral surface of the protruding portion of the probe portion. .

  In this rotary tool, the second divided member is coupled to the first divided member so that the probe portion protrudes from the first hollow portion toward the shoulder portion. For this reason, even if it does not necessarily form a groove | channel to the base end part of a probe part, the part by which the groove | channel was formed in the surrounding surface among probe parts can be protruded from a shoulder part. As a result, since the groove is disposed over the entire protruding portion of the probe portion, the stirrability of the metal material can be improved, and plastic flow can be efficiently generated. Moreover, in this rotary tool, the protrusion amount of the probe portion can be defined by bringing the pedestal portion into contact with the base end surface of the first divided member. Therefore, the protruding amount of the probe portion can be surely set to the target size, and the processing accuracy can be improved. As described above, according to this rotary tool, it is possible to efficiently generate plastic flow and obtain a sound joint.

  Further, the pedestal portion may abut on the proximal end surface of the first split member via a spacer provided around the trunk portion. In this case, the protrusion amount of the probe portion can be easily adjusted by the thickness of the spacer.

  Further, the first divided member and the second divided member may be formed of a similar metal material. In this case, it can suppress that a thermal stress arises between the 1st division member and the 2nd division member by the temperature rise at the time of joining.

  ADVANTAGE OF THE INVENTION According to this invention, the rotational tool which can produce a plastic flow efficiently and can obtain a healthy joint part can be provided.

It is a block diagram of the friction stir welding apparatus to which the rotary tool which concerns on one Embodiment of this invention is applied. It is sectional drawing of the rotation tool of FIG. It is sectional drawing of the 1st division | segmentation member of FIG. It is sectional drawing of the 2nd division member of FIG. It is a side view which shows the mode at the time of the groove processing in the conventional rotary tool. FIG. 3 is a cross-sectional view showing a case where a spacer is arranged between a first divided member and a second divided member in the rotary tool of FIG. 2.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. In the following description, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted.

  A friction stir welding apparatus 1 shown in FIG. 1 is an apparatus that forms a continuous joint 3 along a butted portion P between metal materials 2 and 2 using a rotary tool 10. The metal material 2 to be joined is an outer plate used for, for example, a railway vehicle structure. Examples of the material constituting the metal material 2 include steel materials such as stainless steel and cold rolled steel, and light alloy materials such as aluminum alloys.

  The friction stir welding apparatus 1 includes a tool holder (not shown) that holds a rotating tool 10, a rotating motor 4 that rotates the rotating tool 10 around a central axis, and a moving motor that moves the rotating tool 10 along the abutting portion P. 5, a pressing mechanism 6 that presses the rotating tool 10 against the abutting portion P, a controller 7 that controls the rotating motor 4, the moving motor 5, and the pressing mechanism 6, and a plate disposed under the metal materials 2 and 2. And a backing material 8 having a shape.

  The tool holder is formed in a substantially cylindrical shape by a ductile material such as metal. The tool holder is tilted with respect to the normal direction of the metal material 2 to the side opposite to the traveling direction of the rotary tool 10. An insertion port for the rotary tool 10 is formed at the lower end of the tool holder, and the rotary tool 10 is held by the tool holder by inserting the rotary tool 10 into the insertion port.

  When joining is performed using such a friction stir welding apparatus 1, first, the metal materials 2 and 2 are butted against the backing material 8, and then the rotary tool 10 is disposed above the butted portion P, and the rotary tool Ten probe portions 31 (described later) are pushed into one end of the butted portion P. Then, the rotary tool 10 is moved to the other end of the butted portion P while rotating. Thereby, the frictional heat generated between the probe part 31 and the metal material 2 enters the abutting part P, and the continuous joint part 3 is formed in the abutting part P by plastic flow due to the frictional heat.

  Next, the rotary tool 10 applied to the friction stir welding apparatus 1 will be described in detail. As shown in FIG. 2, the rotary tool 10 includes a main body portion 11 having a substantially cylindrical shape. The distal end surface of the main body 11 is provided with a probe portion 31 having a smaller diameter than the main body 11 and a groove 15 formed on the peripheral surface, and a shoulder portion 21 provided in an annular shape so as to surround the probe portion 31. Yes.

  The rotary tool 10 is configured by a combination of a cylindrical first divided member 20 in which a shoulder portion 21 is provided on the distal end surface side and a second divided member 30 in which a probe portion 31 is provided on the distal end surface side. Has been. More specifically, the rotary tool 10 is configured by fitting the second divided member 30 into the hollow portion 22 of the first divided member 20. Hereinafter, the first divided member 20 and the second divided member 30 will be further described with reference to FIGS. 3 and 4.

  The first divided member 20 is integrally formed of a metal material such as tool steel or chrome molybdenum steel. Inside the first split member 20, a columnar first hollow portion 23 and a columnar second hollow portion 24 are provided as the hollow portion 22. The first hollow portion 23 is provided on the shoulder portion 21 side with an inner diameter through which the probe portion 31 is inserted. The inner diameter of the first hollow portion 23 is substantially the same as the outer diameter of the probe portion 31 or slightly larger than the outer shape of the probe portion 31.

  The second hollow portion 24 has a larger diameter than the first hollow portion 23 and communicates with the proximal end side of the first hollow portion 23. Thereby, a step surface 24 a is formed at the boundary between the second hollow portion 24 and the first hollow portion 23. A female screw portion 24 b is provided on the inner peripheral surface of the second hollow portion 24. The female screw portion 24b is formed, for example, over the entire portion of the inner peripheral surface of the second hollow portion 24 excluding the vicinity of the step surface 24a.

  An annular recess 21a is provided on the distal end surface of the first split member 20 (shoulder portion 21). The recess 21a is formed over the entire front end surface of the first divided member 20, for example. The bottom surface of the concave portion 21a is tapered so that the concave portion 21a becomes deeper as the probe portion 31 is approached, for example.

  The second divided member 30 is integrally formed of, for example, the same metal material as the metal material constituting the first divided member 20. In addition to the probe part 31 mentioned above, the 2nd division member 30 has the cylindrical trunk | drum 32 and the disk-shaped base part 33. As shown in FIG. The length of the probe portion 31 in the axial direction is longer than the length of the first hollow portion 23 in the axial direction.

  The body portion 32 is provided on the proximal end side of the probe portion 31 with an outer diameter corresponding to the inner diameter of the second hollow portion 24. The outer diameter of the trunk portion 32 is substantially the same as the inner diameter of the second hollow portion 24, for example. The length in the axial direction of the body portion 32 is shorter than the length in the axial direction of the second hollow portion 24. For example, the female screw portion 24 b is formed on the inner peripheral surface of the second hollow portion 24. It is equal to the axial length of the part.

  A male screw portion 32 a is provided on the entire outer peripheral surface of the body portion 32. The male screw portion 32 a is screwed into the female screw portion 24 b when the body portion 32 is fitted into the second hollow portion 24. The direction in which the male screw portion 32a and the female screw portion 24b are screwed is opposite to the rotation direction of the rotary tool 10 during joining in order to suppress loosening of the screwing.

  The pedestal portion 33 is provided on the proximal end side of the trunk portion 32 with an outer diameter corresponding to the outer diameter of the first split member 20. The outer diameter of the pedestal portion 33 is, for example, substantially the same as the outer diameter of the first split member 20. Of the surface of the pedestal 33 on the side of the body 32, a portion located on the outer side in the radial direction from the body 32 constitutes a contact surface 33 a for the base end surface 20 a of the first split member 20. In addition, the probe part 31, the trunk | drum 32, and the base part 33 are provided coaxially mutually.

  As described above, the groove 15 is formed on the peripheral surface of the probe portion 31. The groove 15 is provided to promote stirring of the fluidized metal material 2. The groove 15 is formed over the entire portion of the peripheral surface of the probe portion 31 excluding the base end portion. For example, the groove 15 is provided in a spiral shape along the axial direction of the probe unit 31. In addition, the groove | channel 15 should just be able to accelerate | stimulate stirring of the metal material 2 which flowed, and may be provided by arbitrary shapes or arrangement | positioning. For example, the groove 15 may extend along the axial direction of the probe unit 31 and may be a plurality of grooves arranged in parallel along the circumferential direction of the probe unit 31, or in the circumferential direction of the probe unit 31. A plurality of grooves extending along the axial direction of the probe portion 31 may be used.

  As shown in FIG. 2, the second divided member 30 can be separated from the first hollow portion 23 by screwing the male screw portion 32 a of the trunk portion 32 with the female screw portion 24 b of the second hollow portion 24. The probe portion 31 is coupled to the first split member 20 so as to protrude toward the shoulder portion 21 side. In this coupled state, the amount of protrusion of the probe portion 31 from the first hollow portion 23 is defined by the contact surface 33a of the pedestal portion 33 contacting the base end surface 20a of the first split member 20. . Further, the tolerance of the body portion 32 is absorbed by the separation of the front end surface of the body portion 32 and the step surface 24a of the second hollow portion 24. Further, a part of the probe portion 31 on the distal end side of the portion where the groove 15 is formed on the peripheral surface protrudes from the shoulder portion 21. That is, in the rotary tool 10, the groove 15 is provided over the entire peripheral surface of the protruding portion of the probe portion 31 from the shoulder portion 21.

  As described above, in the rotary tool 10, the second split member 30 is coupled to the first split member 20 so that the probe portion 31 protrudes from the first hollow portion 23 toward the shoulder portion 21. For this reason, even if the groove 15 is not necessarily formed as far as the proximal end portion of the probe portion 31, the portion of the probe portion 31 in which the groove 15 is formed on the peripheral surface can be projected from the shoulder portion 21. As a result, since the groove 15 is disposed over the entire peripheral surface of the protruding portion of the probe portion 31, the stirrability of the metal material 2 can be improved and a plastic flow can be efficiently generated.

  That is, as shown in FIG. 5, in the case of the conventional rotary tool 10A in which the shoulder portion 21A and the probe portion 31A are integrally formed, the groove 15A is formed over the entire peripheral surface of the protruding portion of the probe portion 31A. It is difficult. This is because the head portion 41 of the tool 40 for grooving interferes with the shoulder portion 21A, so that the blade portion 42 of the tool 40 cannot be brought into contact with the proximal end portion of the probe portion 31A. On the other hand, in the rotary tool 10 of the present embodiment, as described above, even when the groove 15 is not formed in the base end portion of the probe portion 31, the groove 15 extends over the entire peripheral surface of the protruding portion of the probe portion 31. Can be placed. Further, since it is not always necessary to form the groove 15 up to the base end portion of the probe portion 31, it is possible to avoid the need for a special tool dedicated to the groove processing of the probe portion 31. Further, it is possible to avoid the need for skilled skills to form the groove 15 in the proximal end portion of the probe portion 31 while avoiding the interference of the tool.

  In the rotary tool 10, the protruding amount of the probe portion 31 can be defined by bringing the pedestal portion 33 into contact with the proximal end surface 20 a of the first split member 20. Therefore, the protrusion amount of the probe part 31 can be reliably set to the target size, and the processing accuracy can be improved. As described above, according to the rotary tool 10, it is possible to efficiently generate plastic flow and obtain a sound joint.

  Moreover, in the rotary tool 10, the 1st division member 20 and the 2nd division member 30 are formed with the same metal material. Thereby, since there is no difference in the thermal expansion coefficient between the first divided member 20 and the second divided member 30, the first divided member 20 and the second divided member 30 are increased by the temperature rise at the time of joining. It can suppress that a thermal stress arises in between, and can suppress distortion resulting from a thermal stress.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, as shown in FIG. 6, the contact surface 33 a of the pedestal portion 33 is in contact with the proximal end surface 20 a of the first split member 20 via an annular spacer 50 provided around the trunk portion 32. May be. The outer diameter of the spacer 50 is, for example, the same as the outer diameter of the first split member 20. The inner diameter of the spacer 50 is slightly smaller than the outer diameter of the body portion 32 so as not to contact the male screw portion 32a, for example. In FIG. 6, a part of the female screw portion 24b is omitted.

  When the spacer 50 is disposed, the contact surface 33a and the base end surface 20a are separated by the thickness of the spacer 50, and the protruding amount of the probe portion 31 is reduced. Therefore, according to this modification, the protruding amount of the probe portion 31 can be easily adjusted by the thickness of the spacer 50. As a result, by changing the thickness of the spacer 50, it is possible to process the metal material 2 having various plate thicknesses with one rotating tool 10.

  Moreover, in the said embodiment, although the groove | channel 15 was provided over the whole part except the base end part among the surrounding surfaces of the probe part 31, at least of the protrusion part of the probe part 31 from the 1st hollow part 23 is provided. The groove 15 may be provided over the entire peripheral surface, and the groove 15 may be provided over the entire peripheral surface of the probe unit 31. Moreover, the probe part 31, the trunk | drum 32, and the base part 33 which comprise the 2nd division member 30 may be formed in a different body mutually, and may be combined.

  Moreover, the 1st division member 20 and the 2nd division member 30 do not necessarily need to be formed with the same metal material, and may be formed with the same type | system | group metal material. Even in this case, it is possible to suppress the occurrence of thermal stress between the first divided member 20 and the second divided member 30 due to the temperature rise during bonding, as in the above embodiment, and this is caused by the thermal stress. Distortion can be suppressed. Here, the similar metal material means a metal material containing the same kind of metal as a main component. Examples of similar metal materials include alloys that contain iron as the main component, carbon steel (including S20C and S45C), chromium molybdenum steel, tool steel, stainless steel, and alloys that contain iron as the main component And chromium vanadium steel to which is added. Other examples include alloys containing aluminum as a main component (including 1000 series and 7000 series).

DESCRIPTION OF SYMBOLS 10 ... Rotary tool, 11 ... Main-body part, 15 ... Groove, 20 ... 1st division member, 20a ... Base end surface, 21 ... Shoulder part, 22 ... Hollow part, 23 ... 1st hollow part, 24 ... 2nd Hollow part, 24b ... female screw part, 30 ... second divided member, 31 ... probe part, 32 ... trunk part, 32a ... male screw part, 33 ... pedestal part, 50 ... spacer.

Claims (3)

Friction provided with a probe part having a diameter smaller than that of the main body part and a groove formed on the peripheral surface on the front end surface of the cylindrical main body part, and a shoulder part provided in an annular shape so as to surround the probe part A rotating tool for stir welding,
A cylindrical first divided member in which the shoulder portion is provided on the front end surface side;
The probe portion is provided on the tip surface side, and includes a second divided member that fits into a hollow portion of the first divided member,
The first divided member is
A first hollow portion provided on the shoulder portion side with an inner diameter through which the probe portion is inserted, communicates with a proximal end side of the first hollow portion having a larger diameter than the first hollow portion, and an inner A second hollow portion provided with a female screw portion on the peripheral surface,
The second divided member is
An outer diameter corresponding to the inner diameter of the second hollow portion is provided on the proximal end side of the probe portion, and a barrel portion provided with a male screw portion on the outer peripheral surface, and an outer diameter of the first split member A pedestal portion provided on the base end side of the body portion with a corresponding outer diameter,
The second split member is formed by screwing the male screw portion of the trunk portion into the female screw portion of the second hollow portion, so that the probe portion is moved from the first hollow portion to the shoulder portion side. Is coupled to the first split member so as to protrude,
The amount of protrusion of the probe portion from the first hollow portion is defined by contacting the base portion with the base end surface of the first split member,
The rotating tool, wherein the groove is provided at least over the entire peripheral surface of the protruding portion of the probe portion.   The rotary tool according to claim 1, wherein the pedestal part abuts on a proximal end surface of the first divided member via a spacer provided around the body part.   The rotary tool according to claim 1 or 2, wherein the first divided member and the second divided member are formed of a similar metal material.

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