JP7453508B2 - Impact processing terminal and impact processing method using the same - Google Patents

Description

The present disclosure relates to an impact processing terminal for impact processing a metal material and an impact processing method using the same.

When butt welding a T-shaped structure assembled by welding, when attaching the ends of a T-shaped member to a flat surface, or when welding a metal plate to a metal plate so that it protrudes from the surface side of the plate. In such cases, scallops are provided to prevent welding seams from crossing or overlapping each other, and to bring the welding torch or welding rod closer to the welding area to facilitate welding work.

In structures made of metal materials, the edges of areas where stress is concentrated, such as scallops, are especially welded structures that are subjected to repeated loads such as steel bridges, ships, construction machines, cranes, etc. Fatigue cracks are likely to occur.

Therefore, peening treatment is sometimes attempted on the edge portions of metal materials where fatigue cracks are likely to occur. However, the tip of the peening device (terminal for impact processing) generally has a convex shape and tends to escape from the edge, making it difficult to continue impacting the edge.

Patent Document 1 relates to a metal material chamfering device and a chamfering method, and discloses a vibrating terminal for chamfering an edge portion of a metal material. As schematically shown in FIG. 1, this vibration terminal extends linearly in a direction perpendicular to the vibration direction, and is perpendicular to the direction in which it extends, as schematically shown in FIG. It has a concave groove whose cross section opens toward the distal end.

Patent No. 4734370

However, in the vibrating terminal 1 having a concave groove as described in Patent Document 1, the edge portion of the metal plate 2 having a square hole with corners (circled portions) as shown in FIG. When attempting to perform a striking process, the area circled in FIG. 1 gets caught by the corner (circled area) of the metal plate 2, making it impossible to perform a smooth striking process.

Further, since the vibrating terminal as described in Patent Document 1 has a sharp tip, the angle at which the vibrating terminal is applied to the edge portion is limited, making it difficult to perform impact processing in a narrow space.

Therefore, there is a need for a terminal for impact processing that can easily impact the edge portion of a metal material.

The gist of the present invention is the following impact processing terminal and impact processing method.

(1) A striking processing terminal that is attached to the tip of a vibrating device in the vibration direction and strikes a metal workpiece,
The tip portion has two protrusions and a trough formed between the two protrusions and continuous with the protrusions,
The trough and the two protrusions have a convex shape with curvature in a cross section parallel to the trough line direction of the trough.
Terminal for impact processing.
(2) The impact processing terminal according to (1) above, which has a body continuing from the tip, and the body has a cylindrical shape.
(3) The impact processing terminal according to (1) or (2) above, which passes through the tops of the two projections and has a shape that is 1/2 symmetrical with respect to a plane parallel to the axis. .
(4) The impact processing terminal according to any one of (1) to (3) above, wherein the tip portion has a hardness of 60 or more on the Rockwell C scale hardness (HRC).
(5) While bringing the edge portion of the metal workpiece into contact with the valley portion using the projection portion of the impact processing terminal according to any one of (1) to (4) above as a guide, A method for impact treatment of a metal material, the method comprising vibrating the impact treatment terminal 1 to 50,000 times per second to plastically deform the edge portion.

According to the present invention, it is possible to provide a terminal for impact processing that can easily perform impact processing on the edge portion of a metal material.

FIG. 1 is a perspective view schematically showing a conventional vibrating terminal. FIG. 2 is a perspective view schematically showing a metal plate having a square hole with corners (circled portions). FIG. 3 is a schematic cross-sectional view in a direction parallel to the axis and including the tops of two protrusions of the impact processing terminal. FIG. 4 is a schematic cross-sectional view in the vicinity of the tip of the impact processing terminal, including the tops of two protrusions and parallel to the axis. FIG. 5 is a schematic cross-sectional view of the vicinity of the tip of the impact processing terminal, including the tops of two protrusions and parallel to the axis. FIG. 6 is a schematic cross-sectional view of the vicinity of the tip of the impact processing terminal, including the tops of two protrusions and parallel to the axis. FIG. 7 is a schematic diagram of a cross section A-A' near the tip in FIG. 4, parallel to the direction of the valley line of the valley and including the axis. FIG. 8 is a schematic diagram of a cross section B-B' near the tip in FIG. 4, parallel to the valley line direction of the valley and including the top of the protrusion. FIG. 9 is a schematic diagram of a cross section C-C' in the direction perpendicular to the axis of the protrusion shown in FIG. FIG. 10 is a schematic cross-sectional view of another example of a terminal for impact processing, including the tops of two protrusions and in a direction parallel to the axis. FIG. 11 is a schematic cross-sectional view of another example of a terminal for impact processing, including the tops of two protrusions and in a direction parallel to the axis. FIG. 12 is a schematic cross-sectional view of an example of impact processing using the impact processing terminal according to the present invention. FIG. 13 is a schematic cross-sectional view of the treated shape obtained by the impact treatment of FIG. 12. FIG. 14 is a schematic diagram of an example of the impact treatment on the scalloped portion of the welding member using the impact treatment terminal according to the present invention.

The present invention is a striking processing terminal that is attached to the tip of a vibrating device in the vibration direction to strike a metal workpiece, the tip being between two protrusions and the two protrusions. a trough formed continuously with the protrusion, and the trough and the two protrusions have a convex shape with curvature in a cross section parallel to the valley line direction of the trough.

According to the impact processing terminal according to the present invention, the edge portion can be impacted at the valley portion while the protrusion is hooked onto the edge portion of the metal workpiece so that the tip of the impact processing terminal does not escape. Can be done. Therefore, the impact processing terminal can smoothly impact the edge portion of the metal material, including areas that are not linear, without escaping from the edge portion, thereby introducing compressive residual stress.

According to the terminal for impact processing according to the present invention, it is also possible to perform impact processing on metal parts other than the edge portions using the projections.

According to the impact processing terminal according to the present invention, it is possible to perform processing even in a region where the angle between the surface to be treated and the impact processing terminal (pin) is significantly inclined from the vertical, making it difficult to perform impact processing. For example, it is also possible to perform impact treatment on the scalloped inner surface (edge surface) with the projection of the impact processing terminal according to the present invention. Conventionally, when attempting to impact the inner surface of a scallop, it was necessary to tilt the tip of the impact terminal greatly from perpendicular to the inner surface of the scallop. Since it slipped from the inner surface, it was difficult to continue sufficient impact processing. According to the impact processing terminal according to the present invention, it is also possible to impact the inner surface of the scallop with the projection while hooking the projection on the edge of the material to be treated so that the tip of the impact processing terminal does not escape.

FIG. 3 shows a terminal 10 for impact processing as an embodiment of the present invention. The impact processing terminal 10 shown in FIG. 3 has a tip 12 and a body 14 continuing from the tip 12.

The tip portion 12 refers to a tip portion having a curved outer shape in the cross-sectional schematic diagram of the impact processing terminal 10 in FIG. 3 . The tip portion 12 has protrusions 16 and valleys 18 between the protrusions 16, and each of the protrusions 16 and the valleys 18 has a curved surface with a predetermined curvature. FIG. 3 is a schematic diagram of a cross section of the impact processing terminal including the tops of two protrusions and parallel to the axis. In FIG. 3, the axis is represented by a dashed line. The same applies below.

The tip portion 12 preferably has a hardness of 60 or more on the Rockwell C scale (HRC), more preferably 62 or more on the Rockwell C scale (HRC). Since the tip portion 12 has a hardness of 60 or more on the Rockwell C scale ( ^HRC ), the protrusion 16 of the tip portion 12 and It is possible to suppress the shape of the valley portion 18 from being substantially deformed. Note that the method for measuring the hardness of the tip portion 12 is not limited to the Rockwell hardness test method. Even if the hardness of the tip portion 12 is measured using another measurement method, the measurement result can be converted into Rockwell C scale hardness (HRC). Such a tip portion 12 is made of metal, for example.

Examples of metal materials having a hardness of 60 or more on the Rockwell C scale (HRC) include various cemented carbides such as hardened tool steel and further tempered material.

The body portion 14 refers to a portion of the schematic cross-sectional view of the impact processing terminal 10 in FIG. 3 excluding the tip portion 12, that is, a portion of the cross-sectional schematic diagram of the impact processing terminal 10 of FIG. , and the diameter is constant.

The body 14 is preferably cylindrical. The impact processing terminal (impact processing pin) can be used by being placed in a terminal holder (pin holder), but because the body is cylindrical, the impact processing terminal can be used inside the terminal holder. Can be rotated around the axis. The diameter of the body 14 is preferably 3 to 10 mm, more preferably 4 to 6 mm.

Since the impact processing terminal is rotatable around the axis within the terminal holder, the impact processing terminal does not vibrate when impact processing is performed on the edge of the material to be treated while changing the angle of the impact processing terminal. However, it can be rotated around the axis according to the shape of the edge part. By rotating the impact processing terminal around the axis while vibrating in accordance with the shape of the edge portion of the material to be treated, it is possible to prevent the impact processing terminal from being caught on the edge portion or its surroundings.

In the impact processing terminal 10 shown in FIG. 3, the tip portion 12 has two protrusions 16 and a trough 18 between the two protrusions. As shown in FIG. 3, the two protrusions 16 may each have a knob-like shape in a cross section that includes the tops of the two protrusions 16 and is parallel to the axis. The protrusions 16 to troughs 18 only need to be continuous, and may be formed of a curved line, a straight line, or a combination thereof. In this application, continuous means consisting of a smooth surface without discontinuities of curves, straight lines, or combinations thereof.

FIG. 4 shows a schematic diagram of a cross section in the vicinity of the tip 12 of the impact processing terminal, including the tops of the two projections 16 and parallel to the axis.

In FIG. 4, φ means the inclination angle of the side surface of the tip with respect to the cross section A-A' which is parallel to the direction of the valley line of the valley 18 and includes the axis. The inclination angle φ is preferably 0 to 30 degrees, more preferably 0 to 15 degrees. By setting the inclination angle φ within the above-mentioned preferred range, the diameter of the impact processing terminal (pin diameter) can be made smaller relative to the concave R and the convex R of the tip, allowing it to penetrate into narrower spaces and process. can do.

In FIG. 4, the angle θ between a cross section AA′ in a direction parallel to the valley line direction of the valley portion 18 and including the axis, and a tangent at the inflection point 19 between the protrusion portion 16 and the valley portion 18 is: Preferably it is 45 to 55 degrees. By setting the lower limit of θ within the above-mentioned preferable range, it becomes easier to apply the trough 18 of the impact processing terminal to the part to be processed and perform impact processing at the trough 18, and damage to the protrusion 16 is suppressed. be able to. By setting the upper limit of θ within the above-mentioned preferable range, it is possible to further suppress the distal end portion of the impact processing terminal from escaping from the processing target portion. The space between the protrusion 16 and the trough 18 may be a straight line.

FIGS. 5 and 6 each show a schematic diagram of a cross section in the direction parallel to the axis and including the tops of the two protrusions near the tip of the impact processing terminal when the inclination angle φ is 0 degrees. FIG. 5 shows an example of a striking terminal having an inflection point 19 between the protrusion 16 and the trough 18, and FIG. This is an example of a terminal for impact processing. As shown in FIG. 6, even when the straight portion 20 is formed between the protrusion 16 and the trough 18, the cross section AA' is parallel to the trough line direction of the trough 18 and includes the axis. The angle θ between the protrusion 16 and the trough 18 with the straight line 20 is preferably 45 to 55 degrees.

In Figures 5 and 6, the valley has a radius of curvature R1. The radius of curvature R1 is preferably 1 to 3 mm. By setting the radius of curvature R1 within the above-mentioned preferable range, the edge portion of the processed portion can be rounded to approximately the above-mentioned radius of curvature. The radius of curvature R2 (R2-1, R2-2) of the two protrusions may be the same or different. The radius of curvature R2 is preferably 0.5 mm to 1.5 mm. By setting the radius of curvature R2 within the preferable range, it is possible to impact the edge and the surrounding area of the edge, such as the edge and inner surface (edge surface) of a scallop, without the terminal escaping from the edge.

The trough and the two projections have a convex shape with curvature in a cross section parallel to the trough line direction of the trough. For example, the trough has a convex shape in the vibration direction from the trunk toward the tip in a cross section parallel to the trough line direction and including the axis, and at least the top of the convex shape is It may have a predetermined curvature. In addition, the two protrusions have a convex shape in the vibration direction from the body to the tip in a direction parallel to the valley line direction of the trough and in a cross section including the top of the protrusion, and the convex shape is At least the top portion may have a predetermined curvature. FIG. 7 shows a schematic view of a cross section A-A' in the vicinity of the tip 12 in FIG. 4 in a direction parallel to the trough line direction of the trough portion 18 and including the axis. FIG. 8 shows a schematic diagram of a cross section B-B' in the vicinity of the tip 12 in FIG. 4, parallel to the valley line direction and including the top of the protrusion 16.

Both the cross section A-A' and the cross section B-B' have a convex shape in the vibration direction from the body toward the tip. That is, the tip has a convex shape in the vibration direction from the body toward the tip in a cross section parallel to the valley line direction. In cross-section B-B', the protrusion may be knob-shaped. The lump-like shape refers to a smooth convex shape in the vibration direction from the body toward the tip in a cross section parallel to the axial direction of the impact processing terminal. Further, the protrusion and the trough may be smoothly continuous from the trunk.

The shape of the cross section A-A' of the valley may be a convex shape with the top having a radius of curvature R3, as shown by the solid line in FIG. The vicinity of the trunk of the valley may have the same radius of curvature R3, but the radius of curvature R3 is preferably set near the trunk of the valley so that the valley and the trunk continue more smoothly. It has a smaller radius of curvature R4.

The radius of curvature R3 of the valley in the cross-sectional view of FIG. 7 is preferably 1.5 mm to 3.0 mm. By setting the radius of curvature R3 within the preferable range, the edge portion can be finished with a smooth curved surface without applying the terminal perpendicularly to the edge portion. The radius of curvature R4 of the valley near the body in the cross-sectional view of FIG. 7 is preferably 0.5 mm to 1.5 mm.

The cross-sectional shape of the valley preferably has a top having a radius of curvature R3 and a straight portion 32, as shown by the broken line in FIG. Since the cross-sectional shape of the trough has the shape shown by the broken line in FIG. 7, the distal end becomes more compact, and it is possible to more easily perform impact processing in areas with limited space.

The shape of the cross section B-B' of the protrusion may be a convex shape whose top portion has a radius of curvature R2, as shown in FIG. The vicinity of the body of the protrusion may also have the same radius of curvature R2, but the radius of curvature R2 is preferably set near the body of the protrusion so that the protrusion and the body are more smoothly continuous. It has a smaller radius of curvature R5.

The radius of curvature R6 of the protrusion in the cross-sectional view of FIG. 8 is preferably 1.0 mm to 2.5 mm. The radius of curvature R5 of the projection near the body in the cross-sectional view of FIG. 8 is preferably 3.0 mm or more.

FIG. 9 shows a schematic diagram of a cross section C-C' in the direction perpendicular to the axis of the protrusion 16 in FIG. 4. The two protrusions 16 do not have to have a mutually symmetrical shape, and one of the two protrusions may be large, but preferably they have a mutually symmetrical shape. Since the two protrusions have a mutually symmetrical shape, the same R processing can be performed even if the protrusions are reversed.

10 and 11 show other embodiments of the impact processing terminal of the present invention. 10 and 11 schematically show a cross section of the trough of the impact processing terminal in a direction perpendicular to the trough line and passing through the axis.

As shown in FIG. 10, the impact processing terminal may have a tip end 12 tapered. As a result, for example, the impact processing terminal can have a longer and narrower tip 12 than the impact processing terminal shown in FIG. Are suitable. Furthermore, by making the body part of the impact processing terminal thicker than the tip part, the strength of the terminal is improved, and the occurrence of breakage and fatigue cracking of the terminal itself can be further suppressed. The impact processing terminal shown in FIG. 11 has a short tapered tip 12 compared to the impact processing terminal shown in FIG. ing.

The impact processing terminal preferably has a shape that is 1/2 symmetrical with respect to a plane that passes through the tops of the two projections and is parallel to the axis. The impact processing terminal can be rotated around the longitudinal axis, but since the impact processing terminal has the above-mentioned 1/2 symmetrical shape, the impact processing terminal can be rotated around the longitudinal axis. Even when used in this manner, the same impact treatment can be performed on the treated portion, and the impact treatment portions can be formed in the same shape.

The tip and body can be made as one piece. In order to increase the hardness of the tip, at least the tip may be hardened and, if desired, tempered to produce a terminal for impact processing.

FIG. 12 schematically shows an example of impact processing using the impact processing terminal according to the present invention. In FIG. 12, a solid line represents the outer shape of the impact processing terminal 10 at the center position, and broken lines 101 and 102 represent the outer shape of the impact processing terminal 10 at a position where the angle with respect to the edge portion is changed. As shown in FIG. 12, by pressing the impact processing terminal 10 against the angular edge of the workpiece 34 in the direction shown by the arrow while changing the angle as desired, the impact is applied to each of the circles shown in FIG. given, the processed shape of the processed material 36 shown in FIG. 13 can be obtained.

In FIG. 14, a flange 50 having a welded portion 51 and a web material 40 having a scallop 42 are welded at the welded portion 52, and the inner surface and edge portion of the scallop 42 are subjected to impact treatment using the impact treatment terminal according to the present invention. A schematic diagram of an example is shown.

While moving the impact processing terminal in the direction shown by the curved arrow, impact processing is performed on the weld toe of the scallop 42, that is, the toe of the scallop 42 at the boundary with the welding part 52 from the direction shown by the straight arrow. This allows compressive residual stress to be introduced into the weld toe of the scallop 40. Thereby, the occurrence of fatigue cracks can be suppressed.

The web material is made of metal, and the plate thickness is preferably 10 mm or less. If the web material is relatively thin and has a thickness within the above preferred range, the impact treatment can be performed from both sides of the web material, and the impact treatment can be applied not only to the corners but also over the entire thickness of the web material, that is, the entire inner surface of the scallop. . The lower limit of the thickness of the metal material to be treated is not particularly limited, but may be, for example, 3 mm or more.

As the impact device to which the impact processing terminal according to the present invention is attached, the same one as the conventional one can be used. The striking device is not particularly limited, but a striking device such as an ultrasonic impact processing device, a pneumatic vibration device, an electric striking device, etc. can be used.

As an example of a striking device, the configuration of an ultrasonic impact processing device will be described. The ultrasonic shock processing device includes an oscillating body including an oscillating body made of a magnetostrictive core or a piezo element, an oscillating unit having an oscillating coil wound around the oscillating body, and a waveguide connected in front of the oscillating body.

The oscillator and the waveguide are housed in a cylinder, and the waveguide is held in the cylinder via a spring. A pin holder is provided at the tip of the waveguide that protrudes forward from the cylindrical body, and the striker is thereby attached to the waveguide so that it can vibrate. That is, the striker is attached to the tip side (front side) of the vibration device in the vibration direction.

A seal is provided in the circumferential gap between the waveguide and the cylindrical body, and cooling water is supplied and discharged from the cooling device through the cooling water pipe into the cylindrical body from the water supply port and drain port provided at the rear end of the cylindrical body. Cool the vibration device. Furthermore, a handle for striking work is attached to the rear end of the cylinder.

The present invention also has an aspect as a method for impact treatment of metal materials. The impact processing method for a metal material according to the present invention includes the impact processing while bringing the edge portion of the metal material to be processed into contact with the valley using the protrusion of the impact processing terminal as a guide. The method includes vibrating the terminal 1 to 50,000 times per second to plastically deform the edge portion.

According to this method, in order to prevent the tip of the terminal for impact processing from escaping, the protrusion is used as a guide to bring the edge of the metal workpiece into contact with the trough, and the edge is pressed at the trough. Can handle blows. Therefore, the impact processing terminal can be smoothly impacted without escaping, including edge portions that are not linear, and compressive residual stress can be introduced. According to this method, it is also possible to strike the scalloped inner surface (edge surface) while preferably holding the protruding portion so as not to shift from the edge portion.

In this method, the above-mentioned impact processing terminal is vibrated 1 to 50,000 times per second and the material to be processed is subjected to impact processing, so that the portion to be processed of the material to be processed is damaged by the valley of the impact processing terminal. The impact treatment is performed so that the shape of the part and the shape of the protrusion are transferred and plastically deformed.

1 Conventional vibrating terminal 2 Metal plate having a square hole with corners 10 Impact processing terminal 12 Tip portion 14 Body portion 16 Projection portion 18 Valley portion 19 Inflection point of the curve between the projection portion and the valley portion 20 Straight section between protrusion and valley 32 Straight section 34 Material to be treated 36 Material to be treated 40 Web material 42 Scallop 50 Flange 51 Welded section 52 Welded section 101 External shape at a position where the angle with respect to the edge of the impact processing terminal is changed 102 External shape at a different angle to the edge of the impact processing terminal

Claims (6)

A striking processing terminal that is attached to the tip of a vibrating device in the vibration direction to strike a metal workpiece,
The tip portion has two protrusions and a trough formed between the two protrusions and continuous with the protrusions,
The trough and the two protrusions have a convex shape with curvature in a cross section parallel to the trough line direction of the trough,
The convex top of the valley has a radius of curvature of 1.5 mm to 3.0 mm .
Terminal for impact processing. The impact processing terminal according to claim 1, having a body continuing from the tip, and the body having a cylindrical shape. The impact processing terminal according to claim 1 or 2, having a shape that is 1/2 symmetrical with respect to a plane that passes through the tops of the two projections and is parallel to the axis. The impact processing terminal according to any one of claims 1 to 3, wherein the tip portion has a hardness of 60 or more on the Rockwell C scale hardness (HRC). The impact processing terminal according to any one of claims 1 to 4, wherein the tip portion has a tapered shape. While bringing the edge portion of the metal workpiece into contact with the trough using the protrusion of the impact processing terminal according to any one of claims 1 to 5 as a guide, the impact processing terminal is A method for impact treatment of a metal material, comprising vibrating a terminal 1 to 50,000 times per second to plastically deform the edge portion.

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