JPH0616905B2 - Corrugated plate molding method - Google Patents

Description

Description: TECHNICAL FIELD 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 producing a corrugated plate or the like used in a step of a man conveyor.

[Conventional technology]

Generally, corrugated boards have various uses such as floorboards of buildings, surface materials of stairs or deck plates of vehicles. For example,
Corrugated boards used for steps of passenger conveyor steps such as escalator and electric road are required to have high rigidity and wear resistance. In addition, the pitch of wave peaks is narrowed to prevent accidents such as passengers being caught at the entrance / exit. That is, it is also required to improve the dimensional accuracy of the wave crests in order to narrow the gap between the board for getting on and off the floor and improve the design.

An apparatus for producing a corrugated plate that meets such a demand is disclosed in Japanese Patent Laid-Open No. 59-255825.

[Problems to be Solved by the Invention]

The conventional device described above has a problem that the corrugated top is rounded into a semicircular shape because the plate material is bent along the punch. Even if the top of the punch is a square top, if a wave pitch with a narrow pitch is to be formed, it is difficult to bend in a square shape along the square top due to the rigidity of the plate material, resulting in a semicircular shape. When such a corrugated plate having a semi-circular wave peak is used as a step tread of a passenger conveyor, there is less contact with the footwear of passengers, and there is a problem that passengers slip easily.

An object of the present invention is to provide a method for forming a corrugated plate capable of uniformly forming a flat portion on the crest of a wave peak.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention holds a strip-shaped plate material at two points at a predetermined interval in the longitudinal direction, and applies a force in the direction perpendicular to the longitudinal direction by a central punch to the central portion of these two holding points. While forming the corrugated plate by continuously folding the pinching point to the central punch to form a continuous wave crest on the strip-shaped plate material in a method of forming a corrugated plate continuously by a folding step, after the folding step, after the folding step, In a state in which a backside of the wave crest is in contact with a receiving die having a wide flat part, the process of crushing the crest into a rectangular shape is repeated while restricting the front side outer surface of the wave crest.

[Action]

In the folding step, a wave crest having a semi-circular top is formed on the band-shaped plate material, and in the next wave crest top shaping step, the semi-circular top of the wave crest is flatly crushed and shaped into a rectangular top.

〔Example〕

An example of the folding process will be described with reference to FIGS. 4 and 5. FIG. 4 is a side view of a molding die that performs the folding process. A front upper mold 2 and a rear upper mold 3 are supported by the upper mold holder 1 so as to be movable only in a horizontal (horizontal direction in the figure) direction with respect to the upper mold holder 1, and the two upper molds 2, A spring 4 is interposed between the three so as to push the two apart. The lower die holder 8 supported by the diction pins 6 and 7 protruding above the base plate 5 is movable relative to the lower die holder 8 only in the horizontal (left and right in the figure) direction. 9 and a rear lower mold 10 are supported, and the upper molds 2 and 3 and the lower molds 9 and 10 are engaged by sliding engagement elements 11 and 12 so that only the horizontal movement is synchronized. Fixed to the base plate 5 are cam blocks 13 and 14 each having an inclined surface that moves the lower molds 9 and 10 to the center when the lower molds 9 and 10 descend. And stoppers 15 and 16 for limiting the opening amount of the lower molds 9 and 10 are provided so that the opening amounts of the lower molds 9 and 10 become constant values. The central punch 17 is fixed to the base plate 5 so as to be positioned in the center between the lower molds 9 and 10, penetrates the lower mold holder 8 and projects between the lower molds 9 and 10, and the lower molds 9 and 10 descend. Occasionally, when the strip-shaped thin plate material that protrudes above the lower molds 9 and 10 and is sandwiched between the upper molds 2 and 3 and the lower molds 9 and 10 is folded and folded, the upper end of the strip-shaped thin plate material is placed at the center of the folding of the strip-shaped thin plate material. The upward force is applied and the width of each side is regulated.

In the folding process using the above molding die, the strip-shaped thin plate material, which is a raw material, is slid from the left side of the drawing on the upper surface of the front lower mold 9 and is fed until the tip end thereof rides on the upper surface of the rear lower mold 10, Lower the mold holder 1 to lower molds 2, 3 and lower mold 9,
The strip-shaped thin plate material is sandwiched between 10. After that, by further lowering the upper mold holder 1, the upper molds 2, 3 and the lower mold 9,
Reference numeral 10 descends while pushing down the lower die holder 8 while holding the strip-shaped thin plate material. At this time, the upper molds 2 and 3 and the lower molds 9 and 10 descend while being centered by the slopes of the cam blocks 13 and 14, and the tip of the central punch 17 pushes up the strip-shaped thin plate material. As a result, the strip-shaped thin plate material is folded so as to sandwich the central punch 17, and one wave crest is formed. After that, by raising the upper die holder 1, the lower dies 9, 10 are pushed up, the strip-shaped thin plate material is pushed out from the central punch 17, and by further raising the upper die holder 1, the upper dies 2, 3 are moved to the lower die 9 , 10 to release the strip-shaped sheet material to complete one wave crest forming process. When forming the next wave crest, after feeding the strip-shaped thin plate material by an amount necessary to form one pitch of the wave crest, the above-described processing operation is performed again, and thereafter, this operation is repeated to make the band-shaped thin plate material a corrugated shape. .

FIG. 5 is a side view (for one ridge) of the plate material thus formed into a corrugated shape. The wave crests 18a formed on the strip-shaped thin plate material 18 by such a processing operation are formed with high precision because no unreasonable processing force acts on the strip-shaped thin plate material 18, but the width W of the wave crests 18a with respect to the plate thickness t. When the ratio W / t is small (for example, 5 or less), even if the tip of the central punch 17 is square, the top of the wave crest 18a cannot be formed flat and becomes a substantially circular plate.

Next, the top shaping step of flatly crushing the wave peaks to form a rectangular top will be described with reference to FIGS. 1 to 3. The wave crest portion formed by the folding process described above is the area A in FIG. The receiving die 20 has the same shape as the back side of the corrugated 18a after shaping, and the top of the corrugated shape should be shaped into a rectangle.
18a (back side) is fitted. FIG. 2 shows the side surface of this state. The grooved roller 21 that crushes the top of the wave crest 18a and shapes it into a rectangular shape is a semi-circular shape of the wave crest 18a at its bottom while restricting the outer side wall of the wave crest 18a from spreading from the outside by the side wall of the groove. Rolled to squeeze the top into a predetermined rectangle. FIG. 3 shows the side surface of this state. The wave peak portion in which the top portion is shaped into a rectangle by repeating the top crushing process is the region B in FIG.

In this top shaping process, the positioning is as simple as fitting the wave crest 18a into the receiving die 20, but no positioning error occurs and no large pressing force is required. A highly accurate corrugated plate can be obtained without the top flat surface being inclined. For this reason, when the corrugated board thus obtained is used as a step tread for a passenger conveyor, the wave crests have a uniform flat portion, so that the contact area with the footwear of the passenger increases, and as a result, It is possible to prevent a fall accident due to slippage on the step of the passenger.

Although one embodiment of the present invention has been described above, the present invention can be implemented with the following modifications or improvements.

The top shaping step described with reference to FIGS. 1 to 3 is to squeeze wave peaks one by one in order, but the tops of a plurality of wave peaks are formed using a plurality of rows of receiving molds and rollers with a plurality of grooves. May be shaped at the same time. Further, the receiving mold may have a roller shape.

FIG. 6 shows a base 20 with a receiving mold 20 for shaping the top part via a spring 22.
23 is supported elastically so as to be retractable. In this way, the material is not rolled even if the material thickness varies, so that stable top shaping can be performed without applying excessive force.

FIG. 7 shows a shaping method for preventing the sagging phenomenon from occurring at the roller inlet edge of the wave crest in the wave crest shaping step.
That is, when the grooved roller 21 is pushed in from the edge of the wave crest 18a to be rolled, when the roller 21 rides on the top of the wave crest 18a, the roller 21 acts diagonally on the edge to give an excessive force. After rolling this part, as shown in FIG.
Yields 18c.

The top shaping mold shown in FIG. 7 is provided with a cam plate 24 which gives a back pressure to the grooved roller 21 so as to be movable in the track direction with respect to the fixed track 25. And at the beginning of top shaping,
The cam plate 24 is retracted and crushed as shown by the solid line so that the starting point of processing is the middle portion in the longitudinal direction of the wave crest 18a, and the latter half region l ₁ is shaped during the forward movement of the roller rolling. And roller 21
When returning, the cam plate 24 is advanced as shown by the chain line, and back pressure is applied to the roller 21 in the range of the first half region l ₂ to shape the remaining portion.

According to such crushing processing, the rollers are
Since the 21 does not ride over the edge of the wave crest 18a, the sag phenomenon does not occur, and the entire length of the wave crest 18a can be uniformly shaped into a flat rectangle.

The press machine using the molding die described with reference to FIG. 4 does not necessarily have to have a die cushion function, and instead of the die cushion pins 6, rubber,
The lower die holder 8 may be elastically supported by using a spring, fluid control, or the like, and further, such an elastic support function is provided in either the press machine or the die, or is elastic. The die may be attached to the press machine by a mechanical support function. Further, the center punch 17 may be elastically supported by the base plate 5.

〔The invention's effect〕

As described above, the method of the present invention first forms a wave crest by folding it without applying an unreasonable processing force to the band-shaped plate material in the folding step, so a high-precision corrugated plate is obtained except for the shape of the crest of the wave crest. In the subsequent wave peak shaping process, the back side of the wave peak is received by a receiving mold having a flat portion on the top and only the process of crushing the top into a rectangle while controlling the outer surface of the surface of the wave peak is performed. It is possible to obtain a method for forming a corrugated plate that can form a wave crest having a uniform flat portion with high accuracy.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a wave crest shaping process in the present invention, FIG. 2 is a side view showing a wave crest of a corrugated plate fitted into a receiving mold in the same process, and FIG. 3 is a grooved process in the same process. A side view showing a state in which the semi-circular top of the wave crest is crushed into a rectangle by a roller, FIG. 4 is a side view of a forming die for carrying out the folding step, and FIG. 5 is a side view of the wave crest formed by the folding step. FIG. 6 is a side view showing a modified example of the receiving type support used in the wave crest top shaping process, FIG. 7 is a side view showing a modification of the wave crest top shaping process, and FIG. 8 is a perspective view for explaining a sagging phenomenon due to the shaping process. is there. 2,3 …… Upper mold, 9,10 …… Lower mold, 13,14 …… Cam block, 17 …… Center punch, 18 …… Band-shaped groove plate material, 18 a ……
Hayama, 20 ... Receiving type, 21 ... Grooved roller.

Claims (2)

[Claims] 1. A strip-shaped plate member is held between two points at a predetermined interval in the longitudinal direction, and the center point of the two holding points is applied to the holding points by applying a force in a direction perpendicular to the longitudinal direction by a central punch. In a method for forming a corrugated plate that continuously forms wave peaks by a folding step that repeats the process of forming continuous wave peaks on the band-shaped plate material by squeezing to the central punch, after the folding step is completed, on the top side on the back side of the wave peaks. A method for forming a corrugated plate, characterized in that, in a state where a receiving die having a flat portion is in contact, the process of crushing the top portion into a rectangle while repeating the outer side surface on the front side of the wave peak is repeated. 2. The crushing process according to claim 1, wherein the crushing process is performed by crushing a wave crest top from an intermediate portion in the longitudinal direction of the wave crest toward one end in the longitudinal direction and then from an intermediate portion in the longitudinal direction. A method for forming a corrugated plate, characterized in that the corrugated crest is crushed toward the other end in the longitudinal direction.