CN103586643A - Forming technology for stainless steel bands used for combined steel and aluminum contact rails - Google Patents

Abstract

The invention relates to a producing and forming technology for stainless steel bands, in particular to a forming technology for stainless steel bands used for combined steel and aluminum contact rails. The forming technology includes the steps that the an uncoiled stainless steel band is fed into a leveler to be leveled; a plurality of holes are symmetrically punched in the leveled stainless steel band through a punch, and two marks are symmetrically pressed on the inner sides of the holes; the stainless steel band with the pressed marks are bent along the pressed marks to make the fracture surface of the stainless steel band in the shape of C, at the moment, two symmetrical side faces and a middle face connecting the two side faces are formed on the stainless steel band, and the holes are located in the side faces; the bent stainless steel band is cut into pieces with the same length after being straightened, and the stainless steel band used for the combined steel and aluminum contact rails is formed. The technology is not only simple in process and capable of one-time forming, but also capable of continuous production, both the quality of the product and the size accuracy are extremely high, and the requirement for mass production of the stainless steel bands used for the combined steel and aluminum contact rails can be totally met.

Description

Forming process of stainless steel strip for steel-aluminum composite contact rail

technical field

The invention relates to a production forming process of a stainless steel strip, in particular to a forming process of a steel strip for a steel-aluminum composite contact rail in the rail transit field.

Background technique

With the rapid development of rail transit, the quality requirements for rail transit steel-aluminum composite contact rail are getting higher and higher. As an important part of the steel-aluminum composite contact rail, the quality of the stainless steel strip directly affects the quality of the entire rail transit steel-aluminum composite contact rail. The stainless steel strip is C-shaped before assembly, and there are through holes combined with the aluminum rail body and filled with the material of the aluminum rail body on both sides of the stainless steel strip. The traditional stainless steel strip processing is processed by multiple equipments in batches. First, both sides of the steel strip are cold-bent into a C shape, and then holes or long holes are drilled or processed in the curved parts of the two sides of the steel strip. The disadvantages of this kind of equipment are: due to the high requirements on bending technology and drilling precision during processing, the process is complicated, and it cannot be formed at one time, so the product quality and dimensional accuracy are poor; and the efficiency is very low. So far, there is no mature production process for the processing of stainless steel strips for steel-aluminum composite contact rails, and the production technology of general-purpose equipment cannot meet the requirements for mass production of steel-aluminum composite contact rails.

Contents of the invention

In order to overcome the shortcomings of the prior art, the object of the present invention is to provide a process for forming a steel-aluminum composite contact rail with a stainless steel strip, which is specifically realized by the following technical solutions.

A stainless steel strip forming process for a steel-aluminum composite contact rail, comprising the following steps:

a. Feed the uncoiled stainless steel strip into the leveler for leveling to make it flat;

b. Punch several holes symmetrically on the flattened stainless steel strip through a punching machine, and press two marks symmetrically on the inner side of the holes;

c. Bending the stainless steel strip with the indentation along the indentation, so that the cross section of the stainless steel strip is C-shaped. At this time, the stainless steel strip forms two symmetrical sides and a middle surface connecting the two sides. Holes are located on both sides;

d. Straightening the bent stainless steel strip and cutting it to equal lengths to form the stainless steel strip for the steel-aluminum composite contact rail.

The further design of the stainless steel strip forming process for the steel-aluminum composite contact rail is that the punching machine is a hydraulic punching machine, the punching die has a progressive structure, 5 sets of 10 holes per step, and the punching pressure is 150t.

The further design of the stainless steel strip forming process for the steel-aluminum composite contact rail is that the bending operation is cold-formed by a roll forming unit.

The further design of the stainless steel strip forming process for the steel-aluminum composite contact rail is that the cutting operation is performed by a hydraulic cutting machine.

This process not only makes the production process simple, one-time molding, but also can be continuously produced, the product quality and dimensional accuracy are extremely high, which can fully meet the requirements of mass production of steel strips for steel-aluminum composite contact rails.

Description of drawings

Figure 1 is a schematic cross-sectional view of the stainless steel strip before forming.

Figure 2 is a schematic cross-sectional view of the stainless steel strip after forming.

Fig. 3 is a schematic diagram of the production process of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

A stainless steel strip with a width of 98 mm and a thickness of 6 mm is manually hoisted onto the uncoiler 1. The support cylinder on the uncoiler 1 is cylindrical, and the arc-shaped plate is assembled with the rotating shaft through a connecting rod. The nominal outer diameter of the arc-shaped plate is 508mm, can be increased to 610mm by adding boots, suitable for a variety of coil materials.

After the equipment is started, the coils are manually fed into the leveler 3 through the feeder 2 one by one, and then leveled by the leveler 3, and then the whole line production starts. By setting the shovel head device between the unwinding machine and the pinch roller to cooperate with the pressing head of the uncoiler, the coil material can be unrolled smoothly to prevent loose coils. The feed inlet is equipped with a side vertical roller positioning device, and the guide roller is opened and the manual adjustment distance is 60~200mm, which is suitable for various widths.

The steel strip after leveling is partially symmetrically punched and indented on both sides of the steel strip by the punch press 4 . The center of the hole is 8mm away from the edge of the stainless steel strip, and the diameter or width of the hole is 8mm. The punching machine adopts a hydraulic punching machine, and the punching die has a progressive structure, with 5 groups of 10 holes per step, the punching pressure is up to 150t, and the service life is 2.5~3 million times, the hydraulic punching machine can also adapt to punching 304 stainless steel materials.

Then it is cold-formed in the roll forming unit 5, and the tail of the forming unit completes the straightening of the profiles. The forming roll is made of Cr12, which is finished after quenching to ensure its service life. Increase the number of horizontal roller stands to 12~14, which can prolong the service life of the horizontal rollers.

Finally, the profile is cut to a fixed length by the cutting machine 6, discharged through the discharge rack, manually packed, and hoisted into the warehouse. According to the length of the required molded parts, there is a guide device before the profile enters the shearing die, and it is cut by a fast hydraulic system to ensure that the cut is even and the burr is small. The automatic power discharge device pushes the cut-to-length parts away from the material channel, and the parts slide down along the inclined roller table, and are naturally stacked on the blanking rack 7, which is suitable for parts with a length of 14.2mm~18.2mm .

Claims (4)

1. A stainless steel strip molding process for a steel-aluminum composite contact rail, characterized in that it comprises the steps: a. Feed the uncoiled stainless steel strip into the leveler for leveling to make it flat; b. Punch several holes symmetrically on the flattened stainless steel strip through a punching machine, and press two marks symmetrically on the inner side of the holes; c. Bending the stainless steel strip with the indentation along the indentation, so that the cross section of the stainless steel strip is C-shaped. At this time, the stainless steel strip forms two symmetrical sides and a middle surface connecting the two sides. Holes are located on both sides; d. Straightening the bent stainless steel strip and cutting it to equal lengths to form the stainless steel strip for the steel-aluminum composite contact rail. 2. The stainless steel strip forming process for steel-aluminum composite contact rail according to claim 1, characterized in that, the punch press is a hydraulic punching machine, the punching die has a progressive structure, 5 groups of 10 holes per step, and the punching pressure It is 150t. 3. The stainless steel strip forming process for steel-aluminum composite contact rail according to claim 1, characterized in that, the bending operation is formed by cold bending in a roll forming machine. 4. The forming process of stainless steel strip for steel-aluminum composite contact rail according to claim 1, characterized in that the cutting operation is performed by a hydraulic cutting machine.

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