JPS6239049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bending machine for long metal plates (herein, a plate has a flat cross-section whose width is several times as large as its thickness), and especially a bending machine for bending long metal plates in a continuous manner. This invention relates to a flange bending machine that can form a uniform circular flange by spirally winding it in the width direction.

Conventionally, flanges used to connect concrete piles, etc., have been manufactured by cutting a flat steel plate into an annular shape using a gas cutting machine, but with this method, the part removed by cutting is used for other purposes. This results in wasted material and also requires cutting after fusing to improve the roundness of the inner diameter of the opening.
The disadvantage is that it requires a large number of man-hours and is therefore expensive to manufacture.

The present invention was created in consideration of the above, and its purpose is to continuously wind up a long plate-shaped metal material in a spiral shape in the lateral direction, that is, in the width direction, and then to perform vertical cutting and welding of the cut portion. Therefore, it is an object of the present invention to provide a flange bending machine capable of processing flanges having uniform roundness.

The present invention includes a rotatable lower mold consisting of a large-diameter cylinder, a small-diameter cylinder for wrapping a workpiece plate that is integrally attached to the upper surface of the large-diameter cylinder, and an outer mold that is approximately equal to the large-diameter cylinder. A cylindrical upper mold having a diameter and slidably fitted into the small diameter cylinder, and a one-turn spiral in which the annular upper surface of the lower mold and the annular lower surface of the upper mold can be aligned with each other. At the same time, by shifting the positions of the step portions of both the one-turn spiral surfaces by the required amount in the circumferential direction, it is possible to form a mounting space for the tip of the workpiece between the step portions of the upper and lower molds. The present invention relates to a flange bending machine characterized by the following.

Hereinafter, a detailed description will be given based on the embodiments shown in the accompanying drawings. FIG.
The figure shows a plane seen from the top of the processing machine, and a frame 2 made of two side-by-side I-beams extending in the longitudinal direction of the base 1 is installed horizontally above the base 1. There is. Inside the base 1 is an electric motor 3,
A gearbox 5 is arranged to connect the drive shaft of the electric motor with a V-belt 4, and a rotating main shaft 7 rotatably supported by bearings 6 has a large gear 8 approximately in the center. The large gear 8 is provided to protrude from the upper surface of the base 1, and the large gear 8 meshes with the small gear 10 attached to the rotating shaft 9 of the gear box 5, so that the rotating main shaft 7 can be rotated by the drive of the electric motor 3. .

On the upper part of the rotating main shaft 7, a lower mold A for flange bending forming the gist of the present invention is fitted and fixed to the rotating main shaft 7 so as to be placed on the large gear 8.
This lower mold A consists of a lower large-diameter cylinder 11a and a small-diameter cylinder 11b that is integrally attached to the upper side of the large-diameter cylinder and determines the flange opening diameter.
Reference numeral B designates an upper mold that is movable up and down by a hydraulic cylinder 12 and a cylinder rod 13 using the outer circumferential surface of the small-diameter cylinder 11b as a sliding guide surface. It is formed integrally with the annular body 14, and is swingably attached to the cylinder rod 13 by a pivot pin 15, so that chatter caused by the workpiece plate during bending can be absorbed.

FIG. 3 is a perspective view of the upper mold B seen from below, and FIG. 4 is a perspective view of the lower mold A seen from above. Both types are formed in an annular shape, and a groove 16 for attaching the small diameter cylinder 11b is formed in the inner wall of the opening of the large diameter cylinder 11a. The annular upper end surface 17 of the lower mold A and the annular lower end surface 18 of the upper mold B form a one-turn helical surface that aligns with each other when both molds are combined, and the stepped portions 19 and 20 of the same height H have a radius. It is formed over the entire width of both upper and lower end surfaces 17 and 18 in the direction. That is, if the lower mold A and the upper mold B are arranged so that their step portions 19 and 20 are in full contact with each other, the annular upper end surface 17 and the annular lower end surface 18 are also in full contact with each other, and the lower mold A and upper mold B
can be aligned coaxially as shown in FIG. As shown in Fig. 6, if the upper mold B is arranged so that it can move only in the axial direction, then when the lower mold A is rotated clockwise (in the direction of the arrow) when viewed from the bottom side of the lower mold, both steps will be formed. 19 and 20 are spaced apart from each other in the circumferential direction to form an insertion opening I for inserting the workpiece plate therebetween. Further, P is an engagement pin for engaging a workpiece plate that is located on the front side of the step 19 of the lower mold A and is attached to protrude from the annular upper end surface 17, and its protrusion height is equal to the height H of the step 19. It is necessary to keep it smaller.

Upper mold B has cylinder rod 13 as mentioned above.
The main body of the hydraulic cylinder 12 is connected to its mounting frame 2 as shown in FIG.
1 is provided with rollers 22 that run as rails on the opposing horizontal extensions of the two I-beams of the frame 2, so that the rollers 22 can run in the longitudinal direction of the frame 2. In addition, the upper mold B has a vertical sliding guide rod 23.
A stopper 24 is disposed so as to be able to move up and down freely, and is engaged with a stopper 24 that cannot be raised at the upper end of the guide rod. Further, 100 is a reaction force receiving mechanism for receiving a reaction force generated on the workpiece plate when the workpiece plate is bent, and the structure thereof will be explained below.

Reference numeral 25 denotes a hydraulic cylinder that is attached to the base 1 approximately in parallel with the frame 2. A shaft rod 27 is suspended from the extendable end of the cylinder rod 26 in the direction of the base 1, and the coaxial rod is rotatable and has a circumferential surface of the shaft rod 27. A roller 28 is installed on the outer circumferential surface of the roller 28, which serves as a guide for the workpiece and receives a reaction force when machining the workpiece, which can be raised and lowered using the guide surface. 29 is recessed, and the side surface of the workpiece plate is pressed against the vertical annular surface of the recess 29. As shown in the figure, the length of the shaft rod 27 is made larger than the height of the small-diameter cylinder 11b around which the plate to be processed is wound. Further, the position of the roller 28 can be arbitrarily arranged according to the amount of expansion and contraction of the cylinder rod 26, and the direction in which the workpiece plate enters can be freely changed. By having the above configuration, the reaction force receiving mechanism 100 reliably receives the reaction force of the workpiece plate during the winding operation of the workpiece plate, but the mechanism is not necessarily limited to the above configuration.

The upper mold B is non-rotatably mounted by the pivot pin 15 of the cylinder rod 13, but in this case it is mounted so that the stepped portion 20 of the annular lower end surface 18 faces the direction in which the workpiece plate enters.

To describe the operation and function of the flange bending machine having the above configuration, the plate M to be processed has a substantially flat wedge-shaped cross section that becomes thicker toward one end as shown in FIG. The thickness is made to be uniform. That is, during bending, the large diameter side of the workpiece M is stretched more than the small diameter side, so it tends to become thinner, and to prevent this, the portion corresponding to the larger diameter side of the flange is made thicker. Further, an engagement hole into which the engagement pin 20 is fitted is previously bored at one end of the workpiece plate M.

Next, to set the workpiece M to the processing position,
The upper mold B is pulled upward by operating the hydraulic cylinder 12, and the engagement pin P of the lower mold A is
As shown in the figure, the insertion opening I, which is on the roller 28 side and is formed by the separation of the stepped portions 19 and 20 when the lower mold A and the upper mold B are aligned, is on the side in which the workpiece plate M enters. Positioning is performed by operating the electric motor 3. In FIG. 1, the annular recess 2 of the roller 28
In order to arrange the annular bottom surface 29a of No. 9 to be on the same level as the annular upper end surface 17 of the engagement pin P attachment part of the lower mold A, the workpiece plate M is attached to the engagement pin P through the engagement hole. When the plate M is engaged and attached, and the plate M is made to pass through the annular recess 29 of the roller 28, the plate M is supported by the roller 28 and arranged perpendicular to the axis of the small diameter cylinder 11b. The plate M to be processed is not distorted when the small diameter cylinder 11b is tightened.

Next, when the upper mold B is lowered, the workpiece M passes through the insertion opening I and is inserted into the lower mold A from the outside due to the relative positions of the step portions 19 and 20, as shown in FIG. When the lower mold A is rotated counterclockwise by the electric motor 3 as shown in FIG. 11, the workpiece plate M is locked by the engaging pin P.
The small diameter cylindrical body 11b is sequentially moved as if being pulled by, and as the amount of rotation increases, the small diameter cylindrical body 11b is wound and bent into a circular shape.

Since the lower die A has a positive slope in the direction of rotation thereof, the plate M to be processed is similarly wound up in a spiral shape with a positive slope in accordance with the rotation of the lower die A. In this case, if the thickness of the processed plate after molding is set to be approximately equal to the height H of the stepped portions 19 and 20, it is convenient for winding up in multiple stages. Furthermore, since the annular end surfaces 17 and 18 of both the upper and lower molds are aligned with each other, the workpiece plate M is uniformly interposed between both end surfaces, and the annular lower end surface 18 of the upper mold B is always supplied with the workpiece. Processed plate M
It will come into contact with the top surface of. In addition, the hydraulic circuit to the hydraulic cylinder 12 is connected when the workpiece plate M is tightened.
In particular, it is configured to apply a required constant pressure to prevent the waving phenomenon in the portion that contacts the small cylinder 11b, and the upper mold B is raised by the hydraulic cylinder 12 according to the amount of winding. That is, the upper mold B is capable of applying a predetermined pressure to the workpiece M while the upper mold B can be raised by the thickness of the workpiece M after molding. As a result of this rise, after one rotation of the lower mold A, the lowermost helical workpiece _M1 , which has already been rolled up, is exposed to the annular upper end surface 17 of the lower mold A with respect to the upper mold B, as shown in FIG. In addition to this, the vicinity of the step 19 of the upper mold B can always form an entrance opening I' for the workpiece M.
The same material can be wrapped continuously. In addition, when the roller 18 is rolled up, it serves as a reaction force receiver for the plate M to be processed and is also movable up and down, so it can follow the position of the plate M to be processed as it rises sequentially depending on the amount of hoisting, and the roller 18 can always follow the position of the plate M to be processed as it rises. Since the direction is arranged perpendicular to the axis of the small-diameter cylindrical body 11b, it is possible to prevent unnecessary distortion and deformation of the molded product during winding.

Due to the rotation of the lower mold A and the pressure load and rise of the upper mold B which constantly supplies the entrance opening I' to the workpiece plate M, the workpiece plate M is moved in multiple stages until it reaches the height of the small diameter cylindrical body 11b. Can be bent into a spiral shape. Thereafter, the upper mold B is further raised by the hydraulic cylinder 12 and moved to the left in FIG. 1 by the rollers 22, and the bent workpiece M is pulled out from the small diameter cylindrical body 11b and removed. This is the workpiece plate M immediately after bending.
Due to its elastic deformation, it is in a tight state with the outer surface of the small diameter cylindrical body 11B, and it is difficult to remove it from the cylindrical body, but by rotating in the opposite direction, the tightened state is released and its removal is easily performed. It is something.

Fig. 13a shows the removed multi-step spiral work plate M, and if it is vertically cut with a cutter or the like, it will become a ring shape as shown in Fig. 13b, and this ring-shaped threaded body R will be flush. The cut surfaces are aligned with each other so that the two parts meet the same condition, and the flange F shown in FIG. 13c is formed by joining by welding or the like.

The opening diameter of the flange can be adjusted by changing the outer diameter of the cylindrical body 11, and the flange wall thickness can be adjusted by changing the diameter of the flange.
It can be arbitrarily changed by changing the height of the stepped portions 18 and 19 of B, that is, the slope of the annular end surface.

As described above, according to the present invention, since a flat plate can be continuously bent in the width direction, the flange processing time can be significantly shortened, and since a long flat plate can be directly formed into a flange shape, no material is wasted. It has the effect of being highly economical because there is no

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing the internal structure of the flange bent material according to the present invention, FIG. 2 is a top plan view of the same, and FIG. 3 is a perspective view of the upper mold seen from below.
Figure 4 is a perspective view of the lower mold seen from above, Figure 5 is a front view schematically showing the alignment state of the upper mold and lower mold, and Figure 6 is the lower mold in Figure 5. A front view showing a state in which the insertion opening is formed by rotation;
FIG. 7 is a sectional view showing how the upper mold is attached to the frame, FIG. 8 is a sectional view of the plate to be processed, and FIG. 9 is an explanatory diagram showing the state when the plate to be processed is set.
Figure 10 is a view taken along the line II in Figure 9, Figure 11 is an explanatory diagram showing the movement of the workpiece due to rotation of the lower mold during bending, and Figure 12 is from one-stage to two-stage winding. 13. Front view of the relationship between the upper and lower molds and the workpiece plate when moving to the workpiece plate, viewed from the workpiece plate entry direction side.
The figure is an explanatory diagram showing the procedure for processing a spiral wound body into a single flange. A... Lower mold, B... Upper mold, 11a...
Large diameter cylindrical body, 11b... Small diameter cylindrical body, 7... Annular upper end surface, 18... Annular lower end surface, 19, 20... Step portion.

Claims (1)

[Claims] 1. A rotatable lower mold consisting of a large-diameter cylinder and a small-diameter cylinder for wrapping the workpiece, which is integrally attached to the upper surface of the large-diameter cylinder, and an outer diameter approximately equal to that of the large-diameter cylinder. and a cylindrical upper mold that is slidably fitted into the small diameter cylinder, and the annular upper surface of the lower mold and the annular lower surface of the upper mold are formed into a one-turn spiral surface that can be aligned with each other. At the same time, by shifting the positions of the stepped portions of both the one-turn spiral surfaces by a required amount in the circumferential direction, it is possible to form a mounting space for the tip of the workpiece plate between the stepped portions of the upper and lower molds. Features: Flange bending machine.