JPS63108920A - Manufacture of steel sleeper having pawl - Google Patents

Abstract

PURPOSE:To prevent generation of deformation and to perform smooth die bending by concurrently pressing both end parts of a channel steel by an upper die punch device provided with a die bend punch at the center and a bending punch at both end parts. CONSTITUTION:A channel steel 1 is supinely put on bending dies 16a, 16b of a lower die device 17 and bending punches 13a, 13b of an upper punch device 14 abut on the channel 1. When the punch device 14 is pressed down, both the end parts of the channel 1 are deformed into an outward opened flat shape and are bent at the part being in contact with the bending punches 13a, 13b. Then, the punch device 14 is further pressed down and a die bending punch 12 presses so that the back of the channel 1 abuts on a guide bending die 15. On the other hand, the bending operation for both the end parts by the bending punches 13a, 13b and the bending dies 16a, 16b is continued, so that the die bending by the punch 12 and die 15 and the bending for both end parts are concurrently finished. Thus, a steel sleeper having pawls is completed by one press stage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing clawed steel sleepers used for railways, crane tracks, etc.

[Prior Art] In recent years, steel sleepers have come to be used due to the increase in the price of wooden sleepers due to the depletion of wood resources and the difficulty of disposing of concrete sleepers. As disclosed in JP-A-56-85001, various forms have been developed and put into practical use. Recently, a channel steel 1 as shown in the front and side views of Figs. The bottom surface has 9 claws, 2m long,
2b and a slightly upwardly curved shape in the length direction, the clawed steel sleeper 3 has a high practical effect and has come to be used in large quantities. The known manufacturing method will be explained with reference to FIGS. 10 to 12. FIGS. 10 and 11 are explanatory diagrams showing the state in the process of forming the claw part by bending, and it is driven by the pedestal 5 & fixed to the pedestal 4 and a pressing cylinder (not shown). The channel steel 1 is held in a downward position by the suppressing fittings 5b, and then the ends of the channel steel 1 are press-bent using a bending die 6 fixed to the pedestal 4 and a pressing cylinder (not shown) to form the claw portions 2&. Then, the channel steel 1 is left and right reversed, and the other end is similarly attached to the 11th
By press bending as shown in the figure, there are 2m claws on both ends.
2b is formed. Next, as shown in FIG. 12, supporting metal fittings 9a r 9b are fixed to both ends of the pedestal 80, a mold bending die 10 is provided in the center, and the claw portions 2& of the channel steel 1 are fixed.

2b on the support fittings 9m + 9b, and then the grooved steel 1 is pressed into an upwardly warped position by a mold bending punch 11 driven from above by a pressing cylinder (not shown). In addition to the cold or warm pressing method by which the clawed steel sleepers 3 are made, hot bending methods, forging methods, and the like are also employed.

[Problems to be Solved by the Invention] Now, FIG. 7 is a perspective view of the claw part of the clawed steel sleeper.
Because the grooved steel is bent and formed, it has a complicated waveform, and therefore the material is not uniform, and in addition to slight differences and changes such as bending inches, distortion of the shape of the die, and lubrication. However, due to various causes such as misalignment of machining points and machining speed, it is extremely difficult to align the shape and achieve the specified dimensional accuracy.
The manufacturing method shown in Figure 2 is a 5m pedestal.

This is a means of fixing the channel steel 1 with a suppressing fitting 5b and strongly pressing and bending it, but the material is easily damaged, and since it is pressed on one side at a time, it is difficult to make the dimensions and shape of both sides equal, and it is difficult to obtain the desired dimensional accuracy. Therefore, there are many corrections and re-presses,
Furthermore, despite such correction work, tolerances for dimensional accuracy are tight, resulting in a high rate of rejection and rework.Furthermore, in addition to the pressing process, there is also a lot of work such as reversing and transporting, which increases labor costs. Furthermore, the aforementioned hot bending method and forging method also have the problem that energy costs are high and quality defects are likely to occur, as well as that it is difficult to improve dimensional accuracy.

The object of the present invention is to provide an economical manufacturing method that has excellent productivity, great labor-saving effects, good dimensional accuracy, and extremely few defects.

[Rounding Means to Solve the Problem] In order to achieve the above-mentioned object, the inventors of the present invention have created a lower mold die hardware having a mold bending die in the center and bending dies at both ends, in which the grooved steel is placed upside down. The method is characterized in that the groove steel is pressed in one step by pressing the grooved steel using a mold bending punch in the center and an upper mold punch hardware having bending inches at both ends. We developed a manufacturing method for nail steel sleepers and succeeded in solving all the problems.

[Function] In the method of the present invention, the groove steel is placed in a supine position on the lower die hardware having a bending die in the center and bending dies at both ends, so that the stability of the attitude of the groove steel is improved. Good, very little need for special tools or operations to maintain posture.
Also, there is no risk of it shifting or jumping up during press work.

Since both ends of the grooved steel are pressed simultaneously using an upper punch metal piece that has a bending punch in the center and bending punches at both ends, the deviations and distortions that tend to occur during mold bending are avoided. It is possible to perform smooth mold bending without any problems.

Furthermore, when a rolling die equipped with a roller having a tire-shaped bulge is used as a bending die, the die rolls following the workpiece during bending, forming a desired depression in the claw part. At the same time, since the workpiece can be guided, unnecessary expansion of the claw portion in the width direction can be suppressed and the claw portion can be formed in a desired shape.

In addition, since the die rolls, there is no scratching or biting that would cause damage to the surface of the workpiece, and the dual nature of its processing action and guiding action produces products with excellent shapes and no scratches. can get.

Furthermore, when a leading cylindrical roller is used for the bending punch,
Since an action of pushing the channel steel open from the inside to the outside and a bending action along the arcuate surface, an unreasonable bending force that would cause a breakage is not applied to the channel steel 1 during bending.

[Example] Now, the inventors of the present invention have developed the upper punch hardware 14 shown in the front and side views of FIGS. 4(a) and 5(b) and
We succeeded in obtaining an accurate shape by single-step stress bending using the lower die hardware 17 shown in the front and side views of (b).

Figure 4 (IL)? As clearly shown in (b), a mold bending punch 12 having a pressing surface 12 & of a slightly lower skin is provided at the lower central part of the upper mold punch hardware 14, and a core mold bending punch 1
Front cylindrical roller-shaped bending pinches 13m and 13b are fixed to both ends of the center 2.

On the other hand, as shown in the front and side views of FIGS. 5(a) and 5(b), a trapezoidal bending die 15 is fixed to the upper center of the lower die hardware 17. Rolling roller type bending dies 16m and 16b are rotatably supported at both ends of the center by supporting metal fittings 18a and 18b.

As described above, when the grooved steel is placed on the lower die metal fitting 17 in a supine position and pressed with the upper punch metal fitting 14, the desired clawed steel can be formed in just one press. It becomes possible to manufacture sleepers. This type of processing method was previously unknown, and as mentioned above, it was thought that it would be impossible to arrange the claws in a row due to the complicated shape of the claws. It was successfully developed.

Next, a specific method of the present invention will be explained in more detail with reference to the drawings according to the processing procedure.

Figure 1 shows a bending die 15m with a lower die hardware 17,
The grooved steel 1 is placed on the upper die 16b in a supine position, and the upper die punch hardware 14 is bent by the bending punch 13a.

13b is brought into contact with the channel steel 1 and is an explanatory diagram showing the process immediately before starting pressing, and only the channel shelter steel 1 is shown in a longitudinal cross-sectional view for convenience of explanation.

In this type of press working, the work piece is shaped like groove steel 1.
The work can be carried out more efficiently if appropriate guide hardware (not shown) is installed to prevent the machine from shifting from the predetermined position and for safety during the process.

Although the upper punch metal fitting 14 is not shown, it is engaged with an upper suppression cylinder of the press machine and is operated to move up and down.

Next, as shown in FIG. 2, when the upper die punch hardware 14 is pushed down, both ends of the channel steel 1 become flat and open outward and are bent from the portions that contact the bending I edges 13 & 13b.

Further, as shown in FIG. 3, the upper mold 1-inch metal fitting 14 is pushed down, and the back surface of the channel steel 1 (when formed as a sleeper, becomes the rail mounting surface) is bent until it abuts against the bending die 15. One-sided bending punch 13a that presses down with the edge 12
, 13b and the bending dies 15m, 16b continue to bend the ends of the bending punch 12.
When the mold bending with the mold bending die 15 is completed,
At the same time, the bending of both ends is completed. In this way, a clawed steel sleeper is completed in one press step.

Next, dimensions of an example of a press apparatus used for carrying out the present invention will be shown.

In manufacturing a claw steel sleeper with a total length of approximately 2790 silk, a total height of 200 B, and a lower opening width of 280, the following upper punch hardware and lower die hardware were used.

Upper mold hardware Bending punch interval 2360 mm Bending punch @ 910 Dragon Lower die hardware Bending die spacing 2850 rugs Bending die @910 Further, FIG. 6 shows a perspective view during the end bending process.

Components with the same symbols as those in FIGS. 1 to 3 and FIGS. 4 to 5 described above are the same members, so the explanation will be omitted.
In the figure, the bending punch 13 & has a roller type with a leading end and a cylindrical body, and an upper punch hardware 14.
It is welded and fixed to the support arm 14m.

When the dimensions of the bending punch 13& are set to a size that allows the channel steel 1 to be successively opened from the inside to the outside, the ends of the channel steel 1 are easily expanded and bent into a flat shape by a press. Therefore, the claw portion can be formed with excellent dimensional accuracy and quality.

In addition, regarding the bending die 16 & that is, the rolling die, a tire-shaped inflatable portion 19 is provided at the center of the roller, which is the main part.
As mentioned above, if a dent is actively formed in the claw part at the time of bending, and at the same time a guide action for bending is performed, unnecessary expansion of the claw part in the width direction can be prevented and the desired shape can be achieved. It becomes possible to form a claw part.

[Effects of the Invention] The manufacturing method of the present invention can manufacture desired clawed steel sleepers in one step, so it is extremely productive and economical, and there are no problems with dimensional accuracy or quality. Since there is no correction or re-pressing after pressing, it has the effect of significantly reducing sleeper manufacturing costs.

[Brief explanation of the drawing]

1 to 3 are explanatory diagrams showing the press bending process of an embodiment of the present invention, in which FIG. 1 shows the start of pressing, FIG. 2 shows the middle of pressing, FIG. 3 shows the completion of pressing, and FIG. 4 shows the press bending process. (1),
(b) is a front view and a side view of the upper die metal piece according to the present invention, FIG. 5(') + (b) is a front view and side view of the lower die metal piece, and FIG. The schematic oblique lines showing the bending press work are a plan view and a side view of a clawed steel sleeper, and FIGS. 10 to 12 are explanatory diagrams of the press bending process of the conventional method. 1... Channel steel 2m, 2b... Claw part 3
...Claw steel sleeper 4...Pedestal 5m...Pedestal 5b...Press fitting 6...Bending die 7...Bending punch 8...Pedestal
9m, 9b...Supporting metal fitting 10...Bending die 11...Bending punch 12...Bending punch
12 &... Pressing surface 13m, 13b... Bending punch 14... Upper die, ] Sonchi hardware 15... Bending die 16a, 16b... Bending die 17... Lower die hardware 18a , 18b... Pivot support hardware 19... Expansion part. Kodaira Honda・-! Figure 1 Figure 2 Figure 3 Figure 12, Bending punches 13a, 13b: Bending punch 14, L-shaped punch hardware 15 Bending dies 16a, 16b: Bending die 17, Do η! Dice hardware Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12

Claims (4)

[Claims] (1) Place the grooved steel in a supine position on the lower die hardware which has a bending die in the center and bending dies at both ends, then insert a bending punch in the center and bending punches in both ends. A method for manufacturing a claw steel sleeper, characterized in that the grooved steel is pressed using a provided upper punch metal piece and press bent in one step. (2) The method for manufacturing a clawed steel sleeper according to claim 1, wherein a rolling die equipped with a roller having a tire-shaped bulge is used as the bending die. (3) The method for manufacturing a clawed steel sleeper according to claim 1, characterized in that a round-headed cylindrical roller is used as the bending punch. (4) The method for manufacturing a clawed steel sleeper according to claim 1, characterized in that a trapezoidal die is used as the bending die.