JPS6115773B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for forming a corrugated plate, and more particularly to a method for forming a corrugated plate suitable for forming a horizontally curved blank plate such as a metal plate into a corrugated rectangular plate without horizontal bending. In general, corrugated plates made of metal plates etc. are shaped into corrugated shapes.
It is used in a wide variety of places, including building materials such as roof plates and floor plates, and structural members for industrial equipment such as heat sinks and heat absorbing plates. For example, recently, attempts have been made to construct steps for passengers on passenger conveyors (escalators, etc.) using corrugated stainless steel plates. That is, FIG. 1a is a partial configuration diagram of a passenger conveyor, where a is a parapet, b is a step, c is a boarding floor, and d is a partial configuration diagram of a passenger conveyor.
is a comb plate. The step b and the comb teeth d are, as shown in FIG. It is configured to move while meshing with teeth dd. Therefore, the accuracy of the uneven portion bb of this step b, especially the accuracy of the top pitch P, must be extremely precisely finished. Therefore, if step b is manufactured by forming a convex strip on a flat plate as in the past, it will be expensive, but if it is manufactured using a corrugated mold using a stainless steel plate, it will be very inexpensive. In order to obtain such a rectangular corrugated plate, a rectangular plate has conventionally been used as a blank plate to be formed by a corrugating machine. That is, as shown in FIG. 2, a rectangular blank plate 1A
is inserted between a die 2 having a groove 2A and a punch 3 having a protrusion 3A that engages with the groove 2A, and moving the punch 3 up and down while sequentially feeding the blank 1A by a predetermined pitch. As shown in the top view of FIG. 1 and the side view of FIG. 1B, a rectangular corrugated plate 1B with a width W and a length LB having n corrugations with a pitch P and a height H was obtained. By the way, in order to obtain this rectangular corrugated plate 1B, a blank plate to be formed having a development length LA several times the length LB is required. That is, as shown in FIG.
The developed length l can generally be determined by the equation (1) below. l=2H-2 (t+R ₁ +R ₂ ) +P-2 (t+R ₁ +R ₂ ) +(k ₁ t+R ₁ )π+(k ₂ t+R ₂ )π =2H+P-4(t+R ₁ +R ₂ ) +π(k ₁ t+k ₂ t + R ₁ + R ₂ ) ...(1) However, R ₁ and R ₂ are the inner radius of the circular arc portion formed at the bottom and top of the wave, t is the plate thickness, and k ₁ and k ₂ are the inside radius during bending. Vertical axis coefficient (0.3 to 0.5). Therefore, in order to obtain a rectangular corrugated plate 1B having a length LB and having n corrugations, a rectangular blank plate 1A with developed length LA=nl...(2) is required, and the obtained corrugated plate It can be seen that a considerably longer rectangular blank plate is required compared to the above. On the other hand, when the long material required for this is purchased from a steel manufacturer, there is generally a horizontal bending dimension δ as shown by the two-dot chain line in Figure 5, and the values shown in Table 1 are accepted as permissible values in JIS. ing.

[Table] Therefore, in order to obtain rectangular blank plate 1A (W x LA), purchased material 1C (WC x LC) is required, and the hatched portion shown in Figure 5 must be cut off during the pre-corrugation forming process. Must be. In this way, in the past, a rectangular blank plate was used to obtain the desired rectangular corrugated plate, and a considerable amount of the purchased material had to be cut off to obtain the rectangular blank plate, resulting in a reduction in material yield. In addition, it requires a step to obtain a rectangular blank from the raw material, which increases the cost of the corrugated shaped plate. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for forming a corrugated plate, which eliminates the drawbacks of the prior art and allows a desired rectangular corrugated plate to be obtained using a purchased material with horizontal bends as is. In order to achieve this object, the present invention absorbs the molding development dimension difference between the inner diameter and outer diameter of a horizontally curved blank to be formed by changing the shape of the corrugated portion formed on the inner diameter part and the outer diameter part. It is characterized by being shaped into a plate. Embodiments of the present invention will be described below with reference to FIGS. 6 to 13. First, the principle of the present invention will be explained with reference to FIGS. 6 and 7. For example, as shown in Fig. 6 for a horizontally bent blank to be formed, the width W, the radius of the inner circle of the horizontal bending dimension δ, that is, the inner diameter Ra, the length of the arc of the inner circle LA, and the length of the same chord.
It is assumed that a material 1C is used where the angle θ formed by the same arc is LC. By the way, as shown in Table 1 above, within the allowable range of the horizontal bending dimension δ of the material 1C, the arc length LA
The maximum difference between LC and the length of the same string is LA=2000mm
Since it is 0.075 mm in the case of , and 0.15 mm in the case of LA = 4000 mm, there is no problem at all even if it is assumed that LA≒LC. Therefore, based on the string length LC and the horizontal bending dimension δ, the inner diameter Ra and the angle θ formed by the arc are Ra=LC ² +4δ ² /8δ ……(3) θ=2tan ⁻¹ LC/2(Ra−δ ) ...(4) can be obtained. On the other hand, if a rectangular corrugated plate 1B having a length LB and having n wave portions of equal pitch P is obtained based on this blank plate 1C, when it is developed, the original blank plate 1C will be the same size as the original blank plate 1C. Therefore, as shown in Figure 7, the inner diameter dimension of the corrugated part for one pitch should be
la, it should be developed into a unit fan-shaped part with an outer diameter dimension of lb. Inner diameter dimension la, outer diameter dimension of this unit fan-shaped part
lb is the product of the angle (rad) and radius la=Ra・2π/360・θ/n≒0.01745Raθ/n…
...(5) lb=(Ra+W)・2π/360・θ/n ≒0.01745(Ra+W)(θ/n) ...(6) It can be obtained as follows. The difference Δl is Δl=lb−la=0.01745Wθ/n (7). Therefore, the inner diameter dimension la of the blank plate 1C and the outer diameter dimension
A straight rectangular corrugated plate can be obtained by dividing it into unit fan-shaped portions of lb and forming each fan-shaped portion into corrugated portions of equal pitch P. The present invention has been made based on such a principle, and specific examples thereof will be further described below.
This will be explained using FIGS. 8 to 13. As described above, first, the blank plate 1C shown in FIG. 7 is divided into n unit fan-shaped parts, and holes e and f are bored on the inner diameter side and the outer diameter side, respectively, on the boundary line of each unit fan-shaped part. Next, the blank plate 1C with holes e and f is fed into a waveform forming machine shown in FIG. The wave forming machine includes an upper plate 11, a two-block die configured to be slidable on the lower surface of the upper plate 11 by a needle roller bearing 12, and having guide pins 13A and 14A penetrating through holes e and f of a blank plate 1C. 13, 14, a lower plate 15, and a needle roller bearing 16 on the upper surface of the lower plate 15.
Two blocks of holding plates 17 and 18, which are configured to be slidable and have slots into which guide pins 13A and 14A fit, a base 19, and the base 19.
It consists of a punch 20 that protrudes from and moves up and down. still,
21 is a spring biased in a direction to separate the dies 13 and 14, and 22 is a spring that pushes up the lower plate 15. The waveform shaping machine is constructed in this way, and the punch 20
When one wave part is formed by the die 13,1
4 and the presser plates 17 and 18 are opened, the raw plate 1C is fed a predetermined distance, and the formed wave portion moves to the right by one piece. Next, dies 13 and 14 and presser plate 1
7 and 18 are closed, and in order to make the next unit fan-shaped part wave-shaped, guide pins 13A and 14A pass through holes e and f in the blank plate, and are further fitted into slots in holding plates 17 and 18, Hold the blank plate 1C as shown. Next, when pressure 23 is applied to the bottom surface of the punch 20, the punch 20 presses and bends the material 1C upward.
At this time, the dies 13, 14 and the presser plates 17, 18
are configured to be able to slide on the surfaces of the upper plate 11 and the lower plate 15, so that they approach each other as the blank plate 1C deforms. When the punch 20 pushes up the blank plate 1C further, 2 blocks of die 1
3 and 14 and the holding plates 18 and 19 are further brought closer together, and finally, as shown in FIG. 9, one wave part is completely formed between the dies 13 and 14 by the punch 20 Waveform shaping is completed. The 10th diagram schematically shows the state at this time from the width direction of the corrugated plate.
In the figure, as a result of a uniform push-up pressure 23 acting on the bottom surface of a punch 20 with a constant thickness, the outer diameter side of the unit fan-shaped portion is deformed more than the inner diameter side, so the height of the wave portion formed is There is a difference of ΔH between the two, and the inner diameter side is
One wave portion 1B1 having a dimension of Hb is formed on the outer diameter side of Ha. FIG. 11 is a view showing only the blank plate 1C to be formed and the formed corrugated plate 1B at this time, and as shown in the perspective view a and the partial side view b, the inner diameter side dimensions are
la The unit fan-shaped portion with the outer diameter side dimension lb has reference holes e and f drilled on its boundary line with the guide pin 13A,
As a result of forming the corrugated portion with the punch 20 fixed by the punch 14A and having a constant thickness, a corrugated plate 1B in which the height of the constant pitch P gradually changes from Ha to Hb along the width direction is obtained. The height difference ΔH in this wave part is a very small value, so it can be left as it is, but by applying external pressure to the high part of the wave part and keeping the pitch constant, the crest of the wave can be slightly deformed to form a wave with no height difference. It is also possible to make it into a board. In addition, while the thickness of the tip of the punch 20 remains constant, its shape is changed between the inner diameter side and the outer diameter side,
By making the curvature smaller on the inner diameter side and increasing the curvature toward the outer diameter side, the corrugated plate formed by the punch will have a curvature on the inner diameter side g _a as shown in the side view of Fig. 12. A straight corrugated plate having a wave portion in the shape shown by g _b on the outer diameter side, a constant pitch P, and a constant height Ha=Hb is obtained. In this way, when forming the corrugated portion, the difference in the molding development dimensions between the inner diameter and outer diameter due to side bending is absorbed by the change in the shape of the corrugated portion. A highly accurate straight rectangular corrugated plate 1B with a predetermined pitch P and no lateral bending δ can be obtained. As described above, according to the present invention, the difference in molding development dimensions between the inner diameter and the outer diameter of a horizontally bent blank sheet to be formed is absorbed by the shape change of the corrugated portion formed on the inner diameter part and the outer diameter part, and the corrugated plate As a result, a straight rectangular corrugated plate can be obtained without cutting any of the raw plate, resulting in shortening of processing steps, resource saving, and an inexpensive rectangular corrugated plate.

[Brief explanation of the drawing]

Fig. 1a is a partial configuration diagram of the passenger conveyor, Fig. 1b is a perspective view of the step and comb plate portion of the passenger conveyor, Fig. 2 is a schematic explanatory diagram showing the conventional corrugated plate forming method, Fig. 3a and b is a top view and a side view of a corrugated plate formed by a conventional corrugated plate forming method;
Fig. 4 is a developed dimensional drawing of the corrugated plate, Fig. 5 is a top view showing the relationship between the material and the conventional blank plate to be formed;
FIG. 6 is a top view of a horizontally bent raw material to be formed, FIG. 7 is a developed view of a corrugated plate obtained according to an embodiment of the present invention,
Fig. 8 is a schematic cross-sectional configuration diagram of a corrugated plate forming machine applied to an embodiment of the present invention, Fig. 9 is a partial cross-sectional view of the corrugated plate forming machine during molding, and Fig. 10 is the corrugated plate forming machine. Partial side sectional view of Figure 11a and b
12 is a side view of a corrugated plate formed according to another embodiment of the present invention, and FIG. 13 is a perspective view and a side view of a blank plate and a corrugated plate formed according to an embodiment of the present invention. FIG. 1B...corrugated plate, 1C... blank plate to be formed, e, f
... Hole, P ... Pitch of wave part, H _a , H _b ... Height of wave part, 11 ... Upper plate, 12, 16 ... Needle roller bearing, 13, 14 ... Die, 13
A, 14A... Guide pin, 15... Lower plate, 17, 18... Holding plate, 19... Base, 20
...Punch, 21, 22...Spring, 23...Pressure.

Claims (1)

[Scope of Claims] 1. In a method of forming a horizontally bent molded blank into a corrugated rectangular plate without horizontal bending, the difference in molding development dimension between the inner diameter and outer diameter due to the horizontal bending is reduced by forming the inner diameter part and the outer diameter part. A method for forming a corrugated plate, characterized in that the absorption is caused by a change in the shape of the corrugated part. 2. The method for forming a corrugated plate according to claim 1, characterized in that the dimensional difference during molding development is absorbed by a height difference between the corrugated portions formed on the inner diameter portion and the outer diameter portion. 3. A method for forming a corrugated plate according to claim 1, wherein the corrugated plate is a step of a passenger conveyor.