JPS6048244B2 - Forming method of square corrugated plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming a rectangular corrugated plate, and more particularly to a method of forming a rectangular corrugated plate whose height is larger than its width, which is suitable for forming steps of a passenger conveyor made of stainless steel plate.

Square corrugated plates are widely used in a variety of applications, such as building floorboards, staircase surface materials, and vehicle deck plates.

Furthermore, rectangular corrugated plates made of aluminum alloy with fairly high precision (mainly pitch precision) are used for the steps of escalators, motorized roads, and other passenger conveyors. However, aluminum alloy materials have poor corrosion resistance, and as raw materials tend to be depleted, costs continue to rise chronically.Recently, rectangular corrugated plates made of stainless steel plates, etc., have been proposed as an alternative. . FIG. 1 is a perspective view of a rectangular corrugated plate 1 having a large number of waves 2, such as the steps of a passenger conveyor, and FIG. 2 is a sectional view of a main part for explaining the forming method thereof.

In FIG. 2, 3 is a punch having a protrusion 3a having a shape corresponding to the recess on the back surface of the wave 2 of the rectangular corrugated plate 1, and 4 is a groove having a shape corresponding to the convex portion on the surface of the wave on the rectangular corrugated plate 1. 4a.

In order to form a rectangular corrugated plate 1 from a workpiece 5 made of a strip-shaped metal plate using the punch 3 and die 4, place the workpiece 5 on the punch 3, and place the workpiece 5 on the punch 3 and the die 4 with the arrows. Applying pressure in the X and Y directions, the workpiece 5
By pressing, one square wave 2 is formed. Thereafter, by repeating this operation to form predetermined square waves 2, a corrugated plate 1 having a large number of square waves 2 as shown in FIG. 1 can be obtained. Note that 1 is the width of the top of the square wave 2, 12 is the development width required to form a convex portion of one square wave 2, and p is the pitch of the square wave 2. However, such a conventional method for forming a rectangular corrugated plate has the following problems. That is, due to the problem of the first die life, when press forming as described above, due to the frictional resistance between the punch 3, the die 4, and the workpiece 5, the protrusion 3a of the punch 3 may
is easily damaged.

This is a common problem in breath forming, but especially in the step of a passenger conveyor made of stainless steel plate, it is difficult to solve this problem because a large amount of pressure is required for breath forming, and the height of the square wave 2 is high and the width is narrow. Depending on the punch 3 protrusion 3
Since a also needs to be taller and narrower,
The protrusion 3a of the punch 3 is extremely easy to break, creating a serious problem. The second problem is that in order to obtain the right angle bends M and N by applying pressure only from the top and bottom directions, as shown by arrows X and Y, a large amount of pressing force is required. and the bending radii R, , R of the outer corners of the bent portions M and N, as shown in FIGS. 3 and 4. is very large,
Moreover, the flatness of the top width 1 cannot be ensured, resulting in an unstable shape. In particular, for passenger conveyor steps, a flat top width of 1 is essential for stable boarding and alighting of passengers. The third problem is accuracy. If the waves 2 are formed one by one as described above, the pitch p of the square waves 2 will not be stable, which is not suitable for applications that require high precision such as the steps of a passenger conveyor. is difficult to adopt.

The purpose of the present invention is to solve the problems of the prior art described above,
To provide a method for forming a rectangular corrugated plate that can be easily formed with a small pressing force and has a long mold life. In order to achieve this object, the present invention applies pressing force in a direction perpendicular to the plate surface of a strip-shaped metal plate, which is a workpiece, when forming the top of a rectangular wave using a punch and die. , is characterized in that a flat part that slightly protrudes from the surface and corresponds to the top of the square wave is formed in advance.

An embodiment of the present invention will be described below with reference to FIGS. 5 and 6. First, as described above, before forming the rectangular wave 2 using the punch 3 and die 4 that apply pressure in the direction orthogonal to the longitudinal direction and the width direction of the strip metal plate 5, A concave strip 8 extending in the width direction of the band-shaped metal plate 5 is formed in a portion slightly narrower than the top width 1 corresponding to the back surface of the top surface of the square wave 2 by press processing. A flat top width 1, corresponding to the top surface, is obtained to facilitate the aforementioned right angle bending process.

In this case, the accuracy of the development pitch P of the strip metal plate 5, which corresponds to the pitch p of the square wave 2, is the top width 1, and the groove 8.
Since it is formed by pressing a flat plate, it is well secured. Next, as shown in FIG. 6, the strip-shaped metal plate 5 which has been subjected to such pre-treatment processing is aligned with the concave strip 8 in the center and the outer portions thereof in the vertical direction, that is, in the direction of the arrow G.
, H direction with the gripping tools 7a to 7d, and in this gripped state, the gripping tools 7a to 7d are parallel to the longitudinal direction of the band-shaped metal plate 5 and in mutually inward directions, that is, in the directions of arrows J and K. While shifting, the punch 3 is moved upward and pressed against the die 4 and pressurized, thereby shaping into a square wave. That is, the rectangular wave 2 is formed by applying vertical pressure in the X direction and lateral pressure in the J and K directions to the strip metal plate 5, but when the lateral pressure in the J and K directions is applied, the pretreatment process Since the grooves 8 formed on the strip metal plate 5 act to guide the strip metal plate 5 in a predetermined waveform bending direction, this waveform shaping force directly reduces the pressing force to be applied to the punch 3.

Therefore, the pressing force to be borne by the punch 3 can be reduced compared to the conventional one, and accordingly, even if the height of the square wave is larger than the width dimension, wear and damage of the punch 3 and the die 4 are reduced. Furthermore, since the band-shaped metal plate 5 is bent and formed based on the grooves 8 that are precisely positioned, the shape and pitch of the square waves are also stable, and the square waveform plate can be formed with high precision.

As explained above, according to the present invention, when forming the top part of a square wave by applying pressing force in a direction perpendicular to the plate surface of a band-shaped metal plate using a punch and die, on the surface of the band-shaped metal plate, A first process is performed to form a flat part that slightly protrudes and corresponds to the top of the square wave, and then a pressure is applied in a direction perpendicular to the pressure and from both sides of the top of the square wave toward this top. Because they are applied at the same time, the pressing force that the punch has to bear is reduced, and even with square waves that are taller than the width, wear and breakage of the punch and die are reduced, significantly extending the mold life. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a rectangular corrugated plate, Fig. 2 is a sectional view of main parts showing a conventional method of forming a rectangular corrugated plate, Figs. 3 and 4 are enlarged views of part A and B of Fig. 2. 5 is a front view of a band-shaped metal plate subjected to pretreatment according to an embodiment of the present invention, and FIG. 6 is a front view showing a method of forming a rectangular corrugated plate according to an embodiment of the present invention. It is a diagram. 2...Square wave, 3...Punch, 4.
...Die, 5...Band-shaped metal plate, 7a-7
d...Gripper, 8...Concave strip.

Claims (1)

[Claims] 1. Pressing a strip-shaped metal plate from a direction perpendicular to the longitudinal direction and the width direction of the strip-shaped metal plate using a punch and die to form continuous square waves whose height is larger than the width dimension. In the method of forming a rectangular corrugated plate having a large number of rectangular corrugated plates, a flat portion corresponding to the width of the rectangular waves is formed on the surface portion of the band-shaped metal plate at each development pitch of the rectangular waves in a small number across the width of the band-shaped metal plate. a first process of forming a protrusion, and gripping both sides of the band-shaped metal plate with the flat part in the center using a gripping tool, and in this state, abutting the punch against the groove on the back side of the flat part of the band-shaped metal plate. A second process of repeatedly pressing the die side and moving the gripping tool in a direction parallel to the longitudinal direction of the band-shaped metal plate and mutually inward to form a square wave for each of the flat parts. A method for forming a rectangular corrugated plate characterized by processing. 2. The method for forming a rectangular corrugated plate according to claim 1, characterized in that a stainless steel plate is used as the material for the band-shaped metal plate. 3. The method of forming a rectangular corrugated plate according to claim 1, wherein the rectangular corrugated plate is a step of a passenger conveyor.