JP2020051061A - Instrument mounting support - Google Patents

Abstract

To provide an instrument mounting support capable of improving the strength near the surface of the ground and improving the joining strength between a member positioned near the surface of the ground constituted of another member and a support main body (steel member).SOLUTION: An instrument mounting support 1 erected on the ground GL includes a cast iron member 20 having a rough-textured cast surface formed by casting and a steel member 10 joined to the cast iron member 20 by friction welding. The cast iron member 20 is located near a surface of the ground 90, and an instrument 100 is mounted to the steel member 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fixture mounting column that stands on the ground and to which various fixtures such as lighting fixtures are attached.

In such an instrument mounting column, repetitive stress is exerted on members located particularly at the ground, due to the influence of the weight and wind of the instrument mounted on the upper part. Therefore, a conventional general mounting column for an instrument is composed of a separate member (for example, a base plate or a column base metal) which reinforces a member located on the ground portion, and the separate main body (steel made of steel) is located on the ground portion. The members are joined by welding, mechanical joining, or the like (for example, see [0002] in Patent Document 1).
However, with conventional general joining methods such as welding and mechanical joining, fatigue may occur due to repeated stress, cracks may occur at welded spots, mechanical joints may be broken, and sufficient joint strength may not be obtained. . In addition, there is a case where a triangular rib plate or the like is provided for reinforcement on a separate member located at the edge of the ground, and there is a problem that it takes time to manufacture the separate member.

JP 2008-31711 A

  The problem to be solved by the present invention is to improve the strength of the ground portion and to improve the joining strength between the member located at the ground portion formed of a separate member and the column body (steel member). An object of the present invention is to provide an instrument mounting column that can be used.

  One embodiment of the present invention is an appliance mounting column that stands upright on the ground, and is joined to a cast iron member having a rough textured casting surface formed by casting, and to the cast iron member by friction welding. It is a support | pillar for fixture attachment provided with the said steel member. The steel member includes a first cylindrical portion formed into a cylindrical shape with a first thickness, and the cast iron member includes a second cylindrical portion formed with a second thickness larger than the first thickness. Including a cylindrical portion. The first cylindrical portion is formed so as to be continuous with the first annular surface formed in an annular shape with a first width corresponding to the first thickness and burrs generated by friction welding. The second cylindrical portion includes a joining surface joined to the first cylindrical portion. The joining surface is a second annular surface formed in an annular shape with a second width corresponding to the second thickness, and is a second annular surface joined to all of the first annular surface and at least a part of the burr surface. Two annular surfaces. Then, the cast iron member is located at the edge of the ground, and the tool is attached to the steel member.

According to this mounting column, the member located at the ground edge is made of a cast iron member having a high degree of freedom in shape. By forming the shape, the strength of the ground portion can be improved.
In addition, iron and graphite are present in cast iron members, and this graphite does not rust and only the iron is corroded.The corroded layer containing this graphite has a mechanical fixing effect of the graphite itself, making it difficult to peel off and corroding. It is difficult to progress, and as a result, it has the effect of preventing corrosion, and is superior in corrosion resistance to steel members. Therefore, by positioning the cast iron member at the ground edge, the strength of the ground edge can be improved.
Further, according to the device mounting column, the thickness of the cylindrical portion of the cast iron member is larger than the thickness of the cylindrical portion of the steel member, and the area of the annular surface of the cast iron member is smaller than that of the steel member. Since it is larger than the area of the surface, the annular surface of the cast iron member can be joined not only to the annular surface of the steel member but also to the burr surface connected thereto. For this reason, the joint area between the cast iron member and the steel member can be made larger than the area of the annular surface of the steel member. Therefore, it is possible to improve the joining strength between the cast iron member located at the ground edge and the steel member to which the appliance is attached.

  It is preferable that the second cylindrical portion includes an outer peripheral side smooth surface remaining in a state of being continuous with the joining surface after friction welding by smoothing a part of the outer peripheral side casting surface. Since the outer peripheral side smooth surface from which the casting surface including impurities such as oxides is removed remains in a continuous state with the joining surface, the probability that impurities are mixed in the joining surface can be reduced. For this reason, it is more preferable that the outer peripheral side smooth surface is formed continuously in the circumferential direction of the second cylindrical portion. The probability that impurities are mixed in the joining surface from the outer peripheral side of the cylindrical portion of the cast iron member can be further reduced. Therefore, it is possible to prevent the joining from being hindered due to the contamination of the joining surface with the impurities and to reduce the joining strength.

  It is preferable that the second cylindrical portion includes an inner peripheral side smooth surface which remains in a state of being connected to the joining surface after friction welding by smoothing a part of an inner peripheral side casting surface. Since the inner peripheral side smooth surface from which the casting surface has been removed remains in a state of being connected to the joining surface, the probability that impurities are mixed in the joining surface can be reduced. For this reason, it is more preferable that the inner peripheral side smooth surface is formed continuously in the circumferential direction of the second cylindrical portion. The probability that impurities are mixed in the joining surface from the inner peripheral side of the cylindrical portion of the cast iron member can be further reduced.

  The burr surface includes an outer annular burr surface formed annularly on the outer peripheral side of the first cylindrical portion, and an inner annular burr surface annularly formed on the inner peripheral side of the first cylindrical portion. Preferably, the second annular surface is joined to all of the first annular surface, at least a part of the outer annular burr surface, and at least a part of the inner annular burr surface. The annular surface of the cast iron member may be joined to the annular burr surface on one side (one of the outer peripheral side and the inner peripheral side) of the steel member, but the annular burr on both sides (both the outer peripheral side and the inner peripheral side). By joining to the surface, the joining area between the cast iron member and the steel member can be increased, and the joining strength can be further improved.

  The strength of the underground portion can be improved, and the joining strength between the member (cast iron member) located at the underground portion and the support body (steel member), which is formed of a separate member, can be improved. An instrument mounting support can be provided.

The conceptual diagram which shows the whole structure of the support | pillar for fixture which is embodiment of this invention. The perspective view which shows the principal part of the support | pillar for instrument attachment. Sectional drawing which shows the principal part of the support | pillar for fixtures (III-III sectional drawing of FIG. 2). FIG. 4 is an end view showing a main part of the instrument mounting column (an end view taken along line IV-IV in FIG. 3). The perspective view showing the situation before joining a cast iron member and a steel member by friction welding. FIG. 6 is a sectional view showing a state before the cast iron member and the steel member are joined by friction welding (a sectional view taken along line VI-VI in FIG. 5). Sectional drawing which shows a mode that a cast iron member and a steel member are joined by friction welding. The perspective view showing the situation after joining the cast iron member and the steel member by friction welding.

  FIG. 1 conceptually shows the entire configuration of an instrument mounting column 1 according to an embodiment of the present invention. The instrument mounting column 1 is erected on the ground GL and includes a cast iron member 20 and a steel member 10 joined to the cast iron member 20 by friction welding. Further, the cast iron member 20 is located at the ground edge portion 90 in contact with the ground GL, and the lighting member 100 is attached to the steel member 10 as an instrument. That is, the fixture mounting column 1 of this embodiment is a lighting fixture mounting column. In addition, the fixture attached to the steel member 10 is not limited to the lighting fixture 100, for example, a traffic light (signal), a sign board, a guide board, a sign board, a surveillance camera, a wire support tool, an overhead wire support tool, and a disaster prevention radio. Various devices such as can be attached.

  FIG. 2 is a perspective view showing a main part of the instrument mounting column 1. FIG. 3 is a cross-sectional view (a cross-sectional view taken along the line III-III in FIG. 2) of a main part of the instrument mounting column 1. FIG. 4 shows an essential part of the instrument mounting column 1 in an end view (end view taken along the line IV-IV in FIG. 3). 2 to 4, the support column 1 is shown in a state where it is laid down sideways. The same applies to the following drawings.

  As shown in FIGS. 3 and 4, the mounting column 1 includes a tubular steel member 10 which is a column main body, and a cast iron member 20 joined to the steel member 10 by friction welding. The steel member 10 includes a first cylindrical portion 11 formed in a cylindrical shape with a first thickness t1. The cast iron member 20 includes a base portion 21 installed in the ground and a second cylindrical portion 22 formed in a cylindrical shape with a second thickness t2 larger than the first thickness t1. 21 and the cylindrical portion 22 are formed by integral molding by casting.

  The cylindrical portion 11 of the steel member 10 has a hollow cylindrical wall 14 extending in the direction of the central axis 11c (axial direction X), and one end (tip) of the cylindrical wall 14 in the axial direction X, one of which is located in the axial direction X. A first deformed surface 35 formed to face the side X1. The deformed surface 35 is obtained by deforming a first pressure contact surface 15 (see FIG. 6) described later by friction welding and corresponds to a first thickness t1, that is, a circle having a first width w1 having the same distance as t1. An outer peripheral side and an inner peripheral side of the annular surface 31 are formed by a first annular surface 31 formed in an annular shape (a region sandwiched between virtual dotted lines L1 and L2 shown in FIG. 4) and burrs 39 generated by friction welding. And a burr surface 32 formed so as to be continuous with

  The burr surface 32 includes an outer peripheral side annular burr surface 32 a formed in an annular shape on the outer peripheral side of the cylindrical portion 11 (a region on the outer peripheral side with respect to a virtual dotted line L <b> 1 shown in FIG. 4) and the inside of the cylindrical portion 11. An inner peripheral annular burr surface 32b (a region on the inner peripheral side with respect to a virtual dotted line L2 shown in FIG. 4) formed in an annular shape on the peripheral side. The burr 39 of the present embodiment includes a curled portion 39c that is warped so that the sharp burr tip 39e faces the other side X2 in the axial direction X, that is, faces the side opposite to the pressing direction. In addition, the outer peripheral side annular burr surface 32a has a form in which the curled portion 39c of the burr 39 is removed (burr removal processing).

  The cylindrical portion 22 of the cast iron member 20 has a hollow cylindrical wall 24 extending in the direction of the central axis 22c (axial direction Y), and one end (tip) in the axial direction Y of the cylindrical wall 24, one of which is located in the axial direction Y. And a second deformed surface 45 formed to face the side Y1. The deformed surface 45 is obtained by deforming a second press contact surface 25 (see FIG. 6) described later by friction welding, and includes a joint surface 45j joined to the cylindrical portion 11 of the steel member 10. In the present embodiment, the entire deformed surface 45 is the joint surface 45j, but a part of the deformed surface 45 may be the joint surface 45j.

  The joining surface 45j includes a second annular surface 41 corresponding to the second thickness t2, that is, a second annular surface 41 formed in an annular shape with a second width w2 having the same distance as t2. The annular surface 41 is joined to the entire annular surface 31, the entire outer peripheral annular burr surface 32a, and a portion of the inner peripheral annular burr surface 32b (from the dashed line L3 shown in FIG. 4). Are also joined to the outer peripheral area).

  According to the device mounting column 1, the thickness t2 of the cylindrical portion 22 of the cast iron member 20 is larger than the thickness t1 of the cylindrical portion 11 of the steel member 10, and the area of the annular surface 41 of the cast iron member 20 is increased. Is larger than the area of the annular surface 31 of the steel member 10. Therefore, the annular surface 41 of the cast iron member 20 can be joined not only to the annular surface 31 of the steel member 10 but also to the outer peripheral annular burr surface 32a and the inner peripheral annular burr surface 32b connected thereto. For this reason, the area (joining area) of the joining surface 45j between the cast iron member 20 and the steel member 10 can be made larger than the area of the annular surface 31 of the steel member 10. Therefore, the joining strength between the cast iron member 20 and the steel member 10 can be improved.

  As shown in FIGS. 2 and 3, the cast iron member 20 has a rough casting surface 20 s formed so as to cover the entire surface by casting, and a casting surface 20 s on the outer peripheral side of the cylindrical portion 22. Are smoothed, the outer peripheral side smooth surface (first outer peripheral side smooth surface) 46 remaining in a state of being connected (contacting) with the joining surface 45j after the friction welding, and the inner peripheral side of the cylindrical portion 22. By smoothing the entire casting surface 20s, the inner peripheral side smooth surface 47 remaining in a state of being connected (contacted) to the joining surface 45j after the friction welding is included. The casting surface 20s is a surface having a rough texture as cast (unprocessed) without removing the casting surface (black scale) containing impurities such as oxides. In the present embodiment, the outer peripheral side smooth surface 46 is formed continuously along the outer peripheral surface 22 a of the cylindrical portion 22 in the circumferential direction without a break, and the inner peripheral side smooth surface 47 is formed of the cylindrical portion 22. It is formed continuously in the circumferential direction along the inner peripheral surface 22b without any break. The outer peripheral side smooth surface 46 and the inner peripheral side smooth surface 47 are arranged apart from each other by a distance corresponding to the second thickness t2.

  The cast iron member 20 further smoothes a part of the casting surface 20 s on the outer peripheral side of the connection portion 21, which is close to the steel member 10 to be joined, to thereby smooth the first outer peripheral side. An outer peripheral side smooth surface (second outer peripheral side smooth surface) 48 arranged adjacent to the surface 46 is included. The outer peripheral side smooth surface 48 of the cylindrical portion 22 located at the tip of one side Y1 in the axial direction Y is larger than the end face 21e of the connecting portion 21 located at the tip of the other side Y2 in the axial direction Y of the cast iron member 20. It is arranged at a position close to the deformation surface 45. The outer peripheral side smooth surface 48 of the present embodiment is formed in a perfect circle with respect to the central axis 22c.

  According to the device mounting column 1, the outer peripheral side smooth surface 46 and the inner peripheral side smooth surface 47 where the cylindrical portion 22 of the cast iron member 20 remains in a state of being connected (contacted) to the joining surface 45j after the friction welding. , It can be prevented that the casting surface 20s comes into contact with the joining surface 45j. For this reason, the impurities contained in the casting surface 20s do not enter the bonding surface 45j via the casting surface 20s. Therefore, it is possible to reliably prevent the joining from being hindered due to the contamination of the joining surface 45j with the impurities, and to reduce the joining strength.

  Further, according to the instrument mounting column 1, since the outer peripheral side smooth surface 46 is in contact with the joint surface 45j, the outer peripheral side smooth surface 46 of the cast iron member 20 and the outer peripheral surface 11a of the steel member 10 are joined. 45j. Since the outer peripheral surface 11a of the steel member 10 is a glossy smooth surface 11a, the joint surface 45j is sandwiched between the smooth surface 46 and the smooth surface 11a having a common or similar aesthetic appearance. Therefore, by making the joining surface 45j inconspicuous, it is possible to provide the appliance mounting column 1 which is a dissimilar material joined body in which the joining surface 45j is hardly visually recognized (recognized) by a user. Further, since the outer peripheral side smooth surface 48 is arranged adjacent to the outer peripheral side smooth surface 46, the sense of unity of the aesthetic appearance can be further improved.

  5 to 8 show an example in which the cast iron member 20 and the steel member 10 are joined by friction welding. FIG. 5 is a perspective view showing a state before joining the cast iron member 20 and the steel member 10 by friction welding, and FIG. 6 is a view before joining the cast iron member 20 and the steel member 10 by friction welding. FIG. 7 is a cross-sectional view showing a state (a cross-sectional view taken along the line VI-VI in FIG. 5), FIG. 7 is a cross-sectional view showing a state where the cast iron member 20 and the steel member 10 are joined by friction welding, and FIG. FIG. 4 is a cross-sectional view showing a state after the steel member 20 and the steel member 10 are joined by friction welding.

  As shown in FIGS. 5 and 6, the cylindrical portion 11 of the steel member 10 is formed in an annular shape at one end in the axial direction X of the cylindrical wall 14 with a first width w1 corresponding to a first thickness t1. The first press-contact surface 15 is provided. The cylindrical portion 22 of the cast iron member 20 includes, at one end in the axial direction Y of the cylindrical wall 24, a second press-contact surface 25 formed in an annular shape with a second width w2 corresponding to a second thickness t2. .

  As shown in FIG. 6, the outer peripheral surface 11a of the steel member 10 is gripped by the chuck device 50, and the outer peripheral side smooth surface (the second outer peripheral side smooth surface) 48 of the cast iron member 20 is gripped by the chuck device 60. Is done. Thereby, steel member 10 and cast iron member 20 are arranged coaxially (so that center axis 11c and center axis 22c coincide) such that pressure contact surfaces 15 and pressure contact surfaces 25 face each other. .

  Next, as shown in FIG. 7, the cylindrical portion 11 is rotated at a high speed around a central axis 22c by a rotation drive unit (not shown), and the cylindrical portion 11 is rotated by a drive unit (not shown). , And the cylindrical portion 11 and the cylindrical portion 22 are joined by utilizing frictional heat generated when the pressing surface 15 is pressed (pressed) against the pressing surface 25. Specifically, by controlling parameters such as the rotation speed of the cylindrical portion 22, the pressing force (heating pressure) of the pressing surface 15 against the pressing surface 25, and the friction time, the temperature of the bonding portion due to frictional heat at the time of pressing is reduced. Control is performed so as to be equal to or higher than the melting point of the cast iron member 20 and equal to or lower than the melting point of the steel member 10. As a result, the press contact surface 25 of the cast iron member 20 is almost completely melted by frictional heat and disappears while being scattered (retreats to the other side Y2 in the Y direction), and the press contact surface 15 of the steel member 10 Most of them produce burrs 39 while being softened (plastically deformed) without melting.

  When the rotation of the cylindrical portion 22 and the pressing (pressing) of the cylindrical portion 11 are stopped at an appropriate timing, the pressing surface 25 of the cylindrical portion 22 is deformed to the deformed surface 45 as shown in FIG. The pressing surface 15 of the cylindrical portion 11 is deformed into a deformed surface 35, and the deformed surface 45 and the deformed surface 35 are joined. In this example, the entire deformed surface 45 is joined to the deformed surface 35, and the deformed surface 45 is a joint surface 45j. Thus, a joined body in which the annular surface 41 of the deformed surface 45, the entire annular surface 31 of the deformed surface 35, a part of the outer peripheral annular burr surface 32a, and a part of the inner peripheral annular burr surface 32b are joined. Obtained, if necessary, the curl-like portion 39c on the outer peripheral side is deburred to provide the instrument mounting column 1 shown in FIGS. 2 and 3. Note that the above is an example, and the method of friction welding is not limited to this.

  In this example, the difference in melting point between the cast iron member 20 and the steel member 10 is utilized, and the steel member 10 is plastically deformed without being melted, and the burr 39 of the steel member 10 is enlarged as compared with the cast iron member 20. At the same time, the thickness t2 of the cylindrical portion 22 of the cast iron member 20 is set to be larger than the thickness t1 of the cylindrical portion 11 of the steel member 10 in advance. Thereby, at least the annular surface 41 having the width w2 corresponding to the thickness t2 can be joined to the annular surface 31 having the width w1 corresponding to the thickness t1 and the burr surface 32 formed outside the annular surface 31. That is, by using the burr surface 32 as a part of the bonding surface 45j, the bonding area is efficiently increased. Therefore, by increasing only the thickness t2 of the cylindrical portion 22 of the cast iron member 20 without increasing the thickness t1 of the cylindrical portion 11 of the steel member 10, the joining strength is efficiently and inexpensively improved. be able to. In addition, as an example of the size of the cylindrical portion 11 and the cylindrical portion 22, the thickness t1 of the cylindrical portion 11 is 5 mm, the thickness t2 of the cylindrical portion 22 is 7 mm, and the size of the cylindrical portion 22 and the cylindrical portion 11 is different. The thickness ratio (t2 / t1) is 1.4. The wall thickness ratio is not limited to the above, but in order to prevent a decrease in bonding strength due to a sudden change in the cross section of the bonded portion due to an area difference between the deformed surface 45 and the deformed surface 35 after the friction welding, the wall thickness ratio is determined. Is preferably 2.0 or less, more preferably 1.8 or less, even more preferably 1.6 or less.

  Further, in this example, since the outer peripheral side smooth surface 48 disposed closer to the deformed surface 45 of the cylindrical portion 22 than the end surface 21e of the base portion 21 is gripped by the chuck device 60, the cylindrical shape accompanying the rotational vibration is held. It is easy to suppress axial deviation of the shape portion 22. Therefore, the friction is made so that the pressure contact surface 15 does not come out of the pressure contact surface 25 (is displaced), that is, the annular pressure contact surface 15 surely contacts the inside of the circular pressure contact surface 25. Can be pressed. Further, since the chuck device 60 grips the smooth surface 48 formed in a perfect circle, the axis alignment (centering) between the central axis 22c of the cylindrical portion 22 and the central axis 11c of the cylindrical portion 11 can be easily performed with accuracy. Can do well. Therefore, the annular surface 41 and the entire annular surface 31, a part of the outer annular burr surface 32a, and a part of the inner annular burr surface 32b can be securely joined.

  As shown in FIG. 1, the fixture mounting column 1 obtained as described above is erected on the ground GL such that the cast iron member 20 is located at the ground edge portion 90. Since the cast iron member 20 is manufactured by casting, the degree of freedom of the shape is high, and a complicated shape can be easily obtained. The cast iron member 20 is more excellent in corrosion resistance than the steel member 10. Therefore, by positioning the cast iron member 20 at the ground edge and making the shape suitable for the ground edge, the strength of the ground edge can be improved. The shape of the cast iron member 20 is not limited to the present embodiment, but may be a shape provided with ribs or the like for further improving strength.

1 Supports for mounting fixtures, 90 Underground parts, 100 fixtures (lighting fixtures)
DESCRIPTION OF SYMBOLS 10 Steel member (steel pipe), 11 1st cylindrical part, 14 cylindrical wall, 15 1st press contact surface 20 Cast iron member, 20s casting surface, 21 base part, 22 2nd cylindrical part, 24 cylinder Wall, 25 second press-contact surface 31 first annular surface, 32 burr surface, 32a outer circumferential annular burr surface, 32b inner circumferential annular burr surface, 35 first deformed surface, 39 burr, 39c curled portion 41 first 2 annular surface, 45 second deformed surface, 45j joining surface, 46 first outer peripheral smooth surface, 47 inner peripheral smooth surface, 48 second outer peripheral smooth surface 50, 60 chuck device t1 first thickness , T2 second thickness, w1 first width, w2 second width

Claims (6)

An instrument mounting support standing on the ground,
A cast iron member having a rough textured casting surface formed by casting, and a steel member joined by friction welding to the cast iron member,
The steel member includes a first cylindrical portion formed in a cylindrical shape with a first thickness,
The cast iron member includes a second cylindrical portion formed in a cylindrical shape with a second thickness greater than the first thickness,
The first cylindrical portion is connected to a first annular surface formed in an annular shape with a first width corresponding to the first thickness, and to the first annular surface by burrs generated by friction welding. Including a burr surface formed as
The second cylindrical portion includes a joining surface joined to the first cylindrical portion,
The joining surface is a second annular surface formed in an annular shape with a second width corresponding to the second thickness, and includes the entire first annular surface and at least a part of the burr surface. An instrument mounting column including a joined second annular surface, wherein the cast iron member is located at a ground edge and an instrument is attached to the steel member.   The second cylindrical portion includes an outer peripheral side smooth surface remaining in a state of being connected to the joining surface after friction welding by smoothing a part of the casting surface on the outer peripheral side. An instrument mounting post as described.   The device mounting column according to claim 2, wherein the outer peripheral side smooth surface is formed continuously in a circumferential direction of the second cylindrical portion.   The said 2nd cylindrical part contains the inner peripheral side smooth surface which remains in the state which continued in the said joining surface after friction welding by smoothing a part of the said casting skin surface of an inner peripheral side, The claim | item. The support for mounting an instrument according to any one of claims 1 to 3.   The support column according to claim 4, wherein the inner peripheral side smooth surface is formed continuously in a circumferential direction of the second cylindrical portion. The burr surface includes an outer annular burr surface formed annularly on an outer peripheral side of the first cylindrical portion, and an inner annular burr formed annularly on an inner peripheral side of the first cylindrical portion. Surface and
The second annular surface is joined to all of the first annular surface, at least a part of the outer peripheral annular burr surface, and at least a part of the inner peripheral annular burr surface. The support | pillar for fixture installation of any one of Claims 1-5.

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