JPH0351609B2 - - Google Patents

Description

[Detailed Description of the Invention] [Background and Objectives of the Invention] The present invention provides a method for manufacturing a composite rigid overhead contact line in which a sliding member made of a wear-resistant metal is integrated by covering the head of a pedestal made of a highly conductive metal. Regarding.

This type of composite rigid overhead contact wire has been known for a long time, and a typical example thereof is disclosed in, for example, Japanese Patent Publication No. 57-33177.

Such a conventional composite rigid overhead contact line has a head, an upwardly directed groove on both sides of the head, and a protrusion defining the groove on the upper part of a frame made of an extruded member made of a highly conductive metal material such as an aluminum alloy. While forming
A plate material made of wear-resistant metal such as stainless steel is bent to cover the head of the pedestal by bending it into an inverted U-shaped cross section, and then the plate material is fitted into the grooves on both sides of the pedestal as a result of being coated as described above. By caulking the protrusions on both sides of the pedestal to both side edges of the pedestal, the pedestal and the plate were integrated.

In such conventional composite rigid overhead contact lines, the sliding members, which are wear-resistant metal plates, are simply held down by caulking of the protrusions of the trestle, so the trestle and sliding members have different coefficients of linear expansion. Temperature changes can cause the joints of dissimilar metals to shift, creating a gap in the area where the sliding member is in close contact with the head of the pedestal, increasing electrical contact resistance in this area and allowing rainwater to enter. Corrosion due to contact between dissimilar metals may progress, and in the worst case scenario, it was predicted that the sliding member would come off the pedestal during use.

In view of the problems of the prior art described above, the present invention has been made to
It is an object of the present invention to provide an excellent method for manufacturing a composite rigid overhead contact line that can improve the integration of sliding members with a pedestal made of highly conductive metal.

[Summary of the invention]

According to the manufacturing method of the present invention, a wear-resistant metal strip is formed into an inverted U-shaped cross section on the head of a long pedestal made of highly conductive metal, and depressions are formed on the inner surfaces of both side edges. A suitable jig is placed on the lower surface of the head to compress and plastically deform the head, and the plastically deformed head material is fluidly filled into the inside of the sliding member without overflowing from the sliding member. At the same time, a part of the head member to be flow-filled is also filled into the recesses on both side edges of the sliding member, and the flow-filling of the plastically deformed head material is such that the width between the both side edges of the sliding member is The process is continued until large deformations occur, and then metallurgical joining of dissimilar metals between the pedestal and the sliding member is performed, and the inward elastic restoring force generated by the deformation of the sliding member and the sliding member are The dissimilar metal bond is maintained by the locking action generated by press-fitting the head material into the recesses formed on the inner surfaces of both side edges of the recess, and the resistance to the force that tends to cause the sliding member to separate from the pedestal portion is increased; Furthermore, the boundary edge of the dissimilar metal joint is placed inside both side edges of the sliding member to prevent it from getting wet with rainwater.

〔Example〕

FIG. 1 is a sectional view showing how the sliding member is assembled to the frame.

That is, the pedestal 1 is made of an extruded material made of a highly conductive metal material such as aluminum, has a rail shape, and has a head 2 having a flat top surface and left and right side surfaces.

On the other hand, the sliding member 3 is formed by bending a band made of a wear-resistant metal such as stainless steel into a substantially inverted U-shaped cross section, and has a flat upper surface and left and right side surfaces corresponding to the head 2 of the frame. It is assumed that it has inside. The bending of such a strip material is performed by roll forming or press bending.

The sliding member 3 is provided with a depression 4 by groove processing on the inner surface of both side edges that hang down.

The pedestal 1 and the sliding member 3 formed as described above are arranged so that the left and right width W ₁ of the head 2 of the pedestal is the width of the sliding member 3.
It is smaller than the inner width of the left and right sides. Then, the sliding member 3 is placed over the head 2 of the pedestal, and gaps are formed between the left and right inner surfaces of the sliding member 3 and the left and right outer surfaces of the head 2. The gap facilitates assembly of the sliding member 3 to the head 2 of the pedestal, and is also provided for fluid filling due to plastic deformation of the head 2 of the pedestal, which will be described later.

FIG. 2 shows the procedure for processing the pedestal 1 and sliding member 3 assembled as described above.

That is, a die 6 having a receiving groove having a width W ₃ larger than the width W 2 between both side edges of the sliding member 3 is applied from the upper side of the sliding member ₃ , while a roll serving as a press mold is applied to the lower surface of the head 2 of the mount. 5, the roll 5
is pushed upward (in the direction of the arrow) to deform the head 2 of the pedestal by compressive plastic deformation.

This compressively plastically deformed head material is set at the time of assembly so that the roll 5 pushed upward closes the opening between both side edges of the sliding member 3 so as not to overflow from the opening of the sliding member. The fluid is filled into the sliding member 3 so as to fill the gap between the left and right surfaces of the head 2 and the sliding member 3. At this time, a portion of the head material to be flow-filled is also flow-filled into the recesses 4 that are located on the inner surfaces of both side edges of the sliding member 3. The fluid filling by plastic deformation of the head material is performed until the sliding member 3 undergoes deformation such that the width W ₂ between its both sides expands to the width W ₃ of the receiving groove of the die 6. to complete the desired composite rigid overhead contact line.

FIG. 3 shows a modification of the sliding member. That is, the sliding member 13 is the same as the above-mentioned embodiment until it is formed by bending a band of wear-resistant metal such as stainless steel into a generally inverted U-shape in cross section, but by further bending both side edges, It differs in that a recess 14 is provided on the inside. In this way, when groove processing is not involved, the mechanical strength is improved without reducing the plate thickness.

〔Effect of the invention〕

As explained above, according to the method for manufacturing a composite rigid overhead contact line according to the present invention, since the highly conductive metal material forming the frame is bonded to the sliding member made of the wear-resistant metal material by the metal flow, the metallurgical It is possible to join dissimilar metals. Moreover, since the sliding member itself is deformed so as to increase the width of both side edges of the sliding member having an inverted U-shaped cross section along with the metal flow of the mount, the sliding member restores itself inward. It always maintains an elastic return (spring back), and furthermore, a part of the plastically deformed head material flows and fills the depressions on the inner surface of both side edges of the sliding member to form a locking part by integral connection. Even if the sliding member is subjected to a force that causes it to peel off from the head of the pedestal during use, the resistance against this force is significantly increased, and a bond of different metals that is stable over time can be obtained.

Furthermore, since the boundary edges of such dissimilar metal joints are formed inside both edges of the sliding member, there is little chance of getting wet with rainwater, and there is no possibility of corrosion between dissimilar metals caused by moisture or the progression of corrosion. can be significantly delayed.

[Brief explanation of drawings]

The attached drawings show an embodiment of the method for manufacturing a composite rigid overhead contact line according to the present invention, and FIG. 1 is a sectional view showing how the sliding member is assembled to the head of the trestle, and FIG. 2 is a sectional view showing the head of the trestle and FIG. 3 is a sectional view showing another example of the sliding member. In the code, 1 is the stand, 2 is the head, 3,
13 is a sliding member, 4 and 14 are depressions, 5 is a roll,
6 is a die.

Claims (1)

[Claims] 1. Cover the head of a long pedestal made of highly conductive metal with a sliding member made of a wear-resistant metal strip formed into an inverted U-shape in cross section and having depressions on the inner surface of both side edges. A suitable jig is placed on the lower surface to compress and plastically deform the head, and the plastically deformed head material is flow-filled into the sliding member without overflowing from the sliding member, and the head is fluid-filled. A portion of the member is also filled into the recesses on both side edges of the sliding member, and such fluid filling of the plastically deformed head material causes the sliding member to deform such that the width between the side edges becomes larger. A method for manufacturing a composite rigid overhead contact line, characterized in that the method includes the steps of: