JPS6351766B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a forming apparatus for corrugated plates, and more particularly to a forming method and apparatus suitable for forming steps of passenger conveyors.

[Background of the invention]

In general, corrugated plates are widely used for various purposes such as building floorboards, staircase surface materials, and vehicle deck plates. For example, in recent escalators, motorized roadways, and other passenger conveyors, corrugated stainless steel plates are used as the surface material for the steps on which passengers step.

FIG. 1 is a schematic side view showing the steps and comb plate portions of the passenger conveyor, and FIG. 2 is an enlarged perspective view of a portion of FIG. 1.

As shown in the figure, the passenger conveyor is composed of a parapet 1, a step 2, a boarding floor 3, a comb plate 4, etc., and a large number of waves 5 are formed on the step 2, which are caused by a large number of teeth on the comb plate 4. It is designed to mesh with 6. Therefore, the accuracy of the wave 5 in step 2, especially the pitch P at the top, must be extremely precise, and precision machining is an essential condition for this type of product.

By the way, conventionally, a corrugated plate having such a large number of waves has been formed as shown in FIGS. 3 and 4.

That is, in these figures, 7 is a punch having a protrusion 7a having a shape corresponding to the recess on the back surface of the corrugation of the corrugated sheet to be formed, and 8 is a groove 8a having a shape corresponding to the convex portion on the corrugated surface of the corrugated sheet. 9 is a push-up plate, 10 is a push-up spring, the workpiece 11 made of a band-shaped metal plate is pressed against the die 8 by the punch 7, and the fourth
As shown by the lined arrows in the figure, the workpiece 11 is evenly pushed into the groove 8a of the die 8 from both the left and right sides,
One wave 13 is formed by pressing. Next, the workpiece 11 is divided into two parts:
2) to the right, press it against the die 8 with the punch 7 again, and press it in the same way to form the next wave 13. From then on, repeat this to form the wave 13 shown in Fig. 5. A corrugated plate 12 having a large number of waves 13 as shown was obtained.

However, in such a forming method, the workpiece 1
1, the delivery positioning error, the change in the coefficient of friction between the die 8 and the workpiece 11, and the elongation rate of the strip metal plate,
Due to changes in material properties such as Young's modulus and yield strength, the pitch P between each formed wave 13 becomes P ₁ ≠ P ₂
The result will be as follows, and there will be large variations in accuracy. This variation in pitch accuracy is due to the width W of the wave 13.
The larger the number of waves 13, the more waves 13
It is said that the larger the ratio H/t between the height H of the workpiece and the thickness t of the workpiece, the more pronounced the problem becomes. Therefore, these values are large and it is unsuitable for applications such as passenger conveyors, which require high precision in the pitch between each wave.

As a way to improve these problems,
There is a molding device as described in Japanese Patent No.-158836. However, since the forming apparatus described here employs pressure forming in which a belt-shaped metal plate is stretched and formed using a punch and die, as in the prior art, the coefficient of friction between the die and the belt-shaped metal plate still changes. There is a limit to how much the pitch accuracy between each wave can be improved because changes in material properties such as the elongation, Young's modulus, and yield strength of the strip metal plate affect the process.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for forming a corrugated plate that can form the pitch between each wave with high precision.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention presses a band-shaped metal plate at a position away from a punch by a die,
In this state, the die is moved toward the punch side to form waves by bending and forming on the band-shaped metal plate, and further, waves are formed one after another using the formed waves as a reference. I decided to do so.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 6 to 12.

A punch 20 for forming waves is fixed, and dies 21a and 21b having a split structure are arranged in front and behind the punch 20 in the direction of transport of a workpiece 11 made of a band-shaped metal plate. This die 2
1a and 21b, holding blocks 22 that hold the workpiece 11 before and after the punch 20;
a, 22b are located. This holding block 2
2a and 22b are needle rollers 2 so that the workpiece 11 can be easily moved in the transport direction (arrows A and B).
3 on the cushion plate 24. Further, this cushion plate 24 is held by a holder 26 so as to be movable in the vertical direction. In addition, the cushion plate 24 is a coil spring 2.
5, it is constantly receiving an upward force. The holder 26 is provided with oblique cams 26a, 26b, and is configured such that when the holding blocks 22a, 22b are pushed from above, the holding blocks 22a, 22b move in the direction (arrow A) toward the punch 20. has been done. On the other hand, the die 21 of the split configuration
The opposing parts of dies 21a and 21b have these dies 21a and 2
A coil spring 27 is provided that is driven in a direction (arrow H) for opening 1b. Also, die 21
a, 21b and the holding blocks 22a, 22b are connected by pins 28a, 28b so that they can move together in the direction of transport of the workpiece 11. The pins 28a, 28b are configured to slide so as not to hinder the vertical movement of the dies 21a, 21b. Further, the dies 21a and 21b are supported by the press ram via needle rollers 29 so as to be lightly moved in the direction of transport of the workpiece 11.

In addition, 30 engages with the formed wave, and the workpiece 1
This is a guide member that performs positioning and feeding. As shown in FIGS. 9 and 10, this guide member 30 is attached to a block 31.
A coil spring 32 that pushes out the material 1 to the supply side (toward the arrow) of the workpiece 11 and a cylinder 33 to push the material to the discharge side (toward the arrow T) are provided. These parts are held by a positioning holder 35, which engages with a vertically long protrusion 22b' provided on the side of the holding block 22b and follows the holding block 22b in the horizontal direction. However, it does not follow in the vertical direction. Further, the block 31 is engaged with a concave cam 36 so as to instantly move from the state of FIG. 10 to the state of FIG. 12 at the bottom dead center of the press shown in FIG. It is driven by part 21b' (FIG. 10). Movement of this block 31 (to the arrow, Fig. 9,
10), the guide member 30 is moved in the direction of the arrow mark in FIG. On the other hand, the block 31
is moved in the direction of arrow T by the cylinder 33, and a coil spring 37 for returning the concave cam 36 to its original position corresponds to the end of the concave cam 36.

Next, the operation will be explained. As shown in FIG. 6, when the press ram is lowered, the dies 21a and 21b move in the direction of the arrow C, and the workpiece 11 is held between the holding blocks 22a and 22b. Furthermore, die 21
When a and 21b are pushed down in the direction of the arrow C, the holding blocks 22a and 22b are attached to the oblique side cam 26 of the holder 26.
a, 26b to move in the direction of arrow A. Similarly, the holding blocks 22a, 22b and the pin 28
The dies 21a and 21b connected by a and 28b are also moved in the direction of arrow D. When the press reaches the bottom dead center, the workpiece 11 is formed into a wave shape by the punch 20 and dies 21a and 21b, as shown in FIG.

That is, before the workpiece 11 comes into contact with the punch 20, the die 21 is placed at a distant position on both sides of the punch 20.
a, 21b and holding blocks 22a, 22b, and contacts the punch 20 in this state. When the workpiece 11 comes into contact with the punch 20, the die 21a,
21b and the holding blocks 22a, 22b approach the sides of the punch 20 while descending, so the workpiece 11 is bent based on the top of the punch 20, and finally forms a waveform as shown in FIG. is formed.

The movement of the guide member 30 in the above operation causes the part 21b' of the die 21b to push the concave cam 36 as the die 21b descends to the states shown in FIGS. 10 to 12. At this time, the block 31 is pushed by the coil spring 32 and moves from FIG. 9 to FIG. 11.
That is, in FIG. 7, the movement of the guide member 30 is as follows:
The movement of arrow N causes the holding block 22b to move towards the oblique side cam 2.
The movement in synchronization with the movement at 6b, and the movement at arrow 1, is the movement when moved by the coil spring 32 shown in FIGS. 9 and 10. Next, when the press ram begins to rise, the workpiece 11 is lifted by the coil spring 25 and removed from the punch 20, and one of the corrugations is engaged with the guide member 30, as shown in FIG. When the press ram further rises, the dies 21a and 21b are removed from the workpiece 11, and at the same time the dies 21a and 21b are removed by the force of the coil spring 27.
21b moves in the direction of arrow H and returns to its original position. The holding blocks 21a, 21b also have pins 28a,
28b in the direction of arrow B and returns to the original position, and at the same time the guide member 30 also moves in the direction of arrow B. That is, the movement of the guide member 30 in FIG. 6 as indicated by the arrow O is due to the movement of the holding block 22b. The movement of the arrow W is as shown in FIGS. 11 and 12. If the cylinder 33 is moved in the direction of the arrow T, the block 31 will similarly move in the same direction, and the cam 36 will be returned to its original position by the coil spring 37. If the cylinder 33 is returned to the position shown in FIG. 9 and FIG. 10, the state shown in FIGS. 9 and 10 will be restored. That is, the movement of the arrow wa in FIG. 6 is the movement of the cylinder 33 and returns to the original position shown in FIG. 6, completing the formation of the single wave 13 in FIG.

According to this embodiment, the workpiece 11, which is a strip-shaped metal plate, is held between the split-structure dies 21a, 21b and the holding blocks 22a, 22b, and in this state, the workpiece 11 is bent using the top of the punch 20 as a reference to form waves. Since it is formed, the workpiece 11 is simply bent. Therefore, the elongation of the workpiece 11 that occurs during press working does not occur, and
Therefore, during forming in this example, there is no effect of changes in the coefficient of friction between the die and the workpiece, or changes in the material properties of the workpiece, such as elongation, Young's modulus, and yield strength. Pitch accuracy can be improved. In addition, the previously formed high-precision pitch wave 13 is passed through the punch 20 and the dies 21a, 21.
Guide member 30 in a predetermined positional relationship with respect to b
Since the workpiece 11 is positioned in this manner, the positioning is performed accurately and the pitch accuracy between each wave 13 can be further improved.

〔Effect of the invention〕

According to the present invention, it is possible to continuously obtain corrugated plates in which the pitch between each wave is highly accurate.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the step and comb board portion of the passenger conveyor, Fig. 2 is an enlarged perspective view of the part shown in Fig. 1, Figs. 3 and 4 are sectional views showing each step of the conventional corrugation method, FIG. 5 is a perspective view of a corrugated plate, FIGS. 6 to 8 are sectional views showing each process of a mold according to an embodiment of the present invention, and FIGS. 9 to 12 are other embodiments of the present invention. FIG. 10 is a sectional view taken along the - arrow in FIG. 9, and FIG. 12 is a sectional view taken along the line XII--XII in FIG. 11. 11...Work material, 13...Wave, 20...Punch, 2
1a, 21b...die, 22a, 22b...holding block, 30...guide member.

Claims (1)

[Claims] 1. A punch having a protrusion corresponding to the waveform, a die having a groove facing the protrusion of the punch, a push-up member provided at a position before and after the punch in the direction of conveyance of the belt-shaped metal plate, and the punch. A corrugated plate forming apparatus comprising a positioning member that engages with a wave formed into a band-shaped metal plate using a die, wherein the die is divided into front and rear parts in a transport direction of the band-shaped metal plate with the punch as the center. In addition, holding blocks for holding the band-shaped metal plate between the die and the die are respectively supported on the push-up members provided before and after the punch, and are interlocked with the die when the die is located at the top dead center. an expanding mechanism for opening and opening the holding block; and a closing mechanism for moving the holding block to a side of the punch and closing the opened die when the die is located at the bottom dead center.
A corrugated plate forming apparatus comprising: a drive mechanism that drives the positioning member in relation to the movement of the die and the holding block.