JPH0253352B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a winding drum for winding a filament such as an electric wire, a rope, a cable, etc., and a method for manufacturing the same.

(Background Art) In recent years, iron drums have come to be used as these winding drums in place of conventional wooden drums because of their robustness and repeatability.

Iron drums are required to have a low weight and be easy to manufacture and process, and are mainly manufactured by forming iron plates, welding, and other processes.

As shown in FIG. 1, the collar of a conventional iron drum is made by cutting an iron plate into a donut shape and attaching an angle member 12 formed into a ring shape to the outside surface of the outer edge of the formed donut-shaped iron plate 11. was applied, and the entire circumference of the joint surfaces 13 and 14 was welded. 15
is a bent part for fixing the torso.

In such a drum, the donut-shaped iron plate 11 and the angle member 12 must be welded at two places along the entire periphery, which requires a lot of labor and time. However, the strength of the base of the angle member 12 was weak.

(Disclosure of the Invention) The present invention has been made in order to eliminate the above-mentioned drawbacks, and includes a structure of a winding drum whose flange has sufficient strength, which is easy to weld, and which can be easily manufactured. The aim is to provide a manufacturing method that is suitable for manufacturing.

A first aspect of the present invention is an iron drum in which the flange is composed of a circular formed iron plate with a shaft hole in the center and an angle member formed into a ring shape, and the circular formed iron plate has a peripheral portion thereof. A plurality of fan-shaped recesses are provided in a radial manner to form an umbrella-shaped convex part,
and the outer edge thereof is recessed from the inner surface of the flange by the thickness of the side of the angle member, and the ring-shaped angle member is fitted onto the outer edge and fixed by spot welding in places. It is a drum.

The second aspect of the present invention is an angle material in which a plurality of fan-shaped recesses are radially provided in the peripheral part to form an umbrella-like convex part, and the outer edge of the convex part is formed into a ring shape from the inner surface of the brim. When press-forming a disc-shaped iron plate for a tsuba that is recessed by the thickness of the side, the pressing mold has dimensions corresponding to the largest outer diameter of the disc-shaped iron plates for a tsuba of the same shape. Press molding is performed using a common circular main mold and individual ring-shaped molds placed thereon having predetermined dimensions for recessing the recessed outer edge, and then the outer edge is pressed. This is a method of manufacturing a winding drum, characterized in that the ring-shaped angle material is fitted to the part and fixed by spot welding in some places to create a flange.

Hereinafter, the present invention will be explained by examples using the drawings.

FIG. 2 is a diagram showing an embodiment of the drum of the present invention,
Figure A is a side view, Figure B is a partially cutaway front view, and Figure C is a cross-sectional view showing the circularly formed iron plate of the tsuba. In the figure, the winding drum has flanges 2, 2 on both sides fixed to a body 1 by welding.

The tsuba 2 includes a disc-shaped formed iron plate (hereinafter simply referred to as a formed iron plate) 3 and a ring-shaped angle member 4.
It consists of. The formed iron plate 3 has a shaft hole 5 in the center, a plurality of fan-shaped recesses 6 are provided radially around the shaft hole, and the remaining projections 7 are in the shape of an umbrella. In this way, the strength of the formed iron plate 3 itself increases. 10 is a shaft hole ring.

Further, the outer edge 8 of the formed iron plate 3 is recessed from the inner surface of the flange by the thickness t of the side of the angle member 4, and is formed into a stepped shape as shown in Figure C. Therefore, when the ring-shaped angle member 4 is fitted to this outer edge portion 8, the collar 2
The inner surface of the drum is on the same plane as the fan-shaped recess 6, and the collar 2 of the drum is constructed by fixing the joint surfaces 9 at some places by spot welding. In this way, the strength of the base of the angle member 4 is increased by the stepped outer edge portion 8.

Next, a method for manufacturing the winding drum of the present invention will be described.

First, in order to form a formed iron plate 3 (excluding the shaft hole ring 10) having a fan-shaped recess 6, an umbrella-shaped protrusion 7, and an outer edge 8 as shown in FIG. 2C, a circular iron plate is cut. For example, it is molded by one press using a pressing die (male die, female die) having a predetermined shape and dimensions.

However, the size of the winding drum changes depending on the dimensions, length, weight, etc. of the filament to be wound, and drums of various sizes are required, and accordingly, the types of the formed iron plates 3 increase. . Therefore, press molding of these shaped iron plates 3 requires stamping dies corresponding to the respective dimensions, and the number of types increases, resulting in an increase in the cost of the stamping dies.

As a countermeasure against this problem, according to the method of the present invention as described below, the number of types of pressing molds can be kept to a minimum.
Figure 3 is a diagram for explaining an embodiment of the method of the present invention, where Figure A is a top view with the upper mold (female mold) removed, and Figure B is a cross section showing the state of the formed iron plate taken out from the pressing mold. It is a diagram. In the figure, the same reference numerals as in FIG. 2 indicate the same parts.

To form the formed iron plate 3 by the method of the present invention,
First, an iron plate with an outer diameter that matches the outer diameter of the tsuba is cut from an iron plate with a desired thickness. In this case, the thickness of the iron plate is changed depending on the weight of the drum to obtain the desired load capacity.

Next, a circular main die 21 and a ring-shaped die 22 as shown in A are used as press molds. The circular main mold 21 has different outer diameters, but is common to various disc-shaped molded iron plates for brim (referred to as similarly shaped molded iron plates for brim) that have the same number and shape of fan-shaped concave portions 6 and convex portions 7. A die with dimensions corresponding to the largest outer diameter of these formed iron plates, i.e., a die with the largest outer diameter among the presses of various sizes that were previously prepared individually. It is.

In addition, in order to have commonality in the pressing molds as described above, it is necessary to
It is preferable to make the number of iron plates, the shape and dimensions of their common parts as uniform as possible, and changes in load capacity can be compensated for by changes in the thickness of the iron plate.

In addition, if the load capacity is insufficient, as shown in Fig. 4, a plurality of radial grooves (concave or convex) 17 are provided in the central plane part 16 of the circularly formed iron plate 3' to prevent distortion caused by pressing. At the same time, the central portion 16 may be reinforced. In the figure, the same reference numerals as in FIG. 2 indicate the same parts.

The ring-shaped pressing mold 22 is a pressing mold for recessing the recessed outer edge 8 of the molded iron plate 3, and is individually molded with predetermined dimensions according to the individual dimensions of the molded iron plate for the flange having the same shape. prepared and used.

As shown in FIG. 3A, these press molds are made by placing the circular main mold 21 on the bottom, placing the ring-shaped pressing mold 22 on top of it, and placing an iron plate and an upper mold (not shown) on top of it. Place and press-form.

Note that the ring-shaped press die 23 on the outer edge of the circular main press die 21 is not necessarily necessary, and may be omitted if a formed iron plate 3 having a smaller outer diameter is to be formed.
By press forming in this way, only one circular main mold 21 can be produced by simply preparing ring-shaped pressing molds 22 with individual dimensions for the molded iron plates for flange of similar shapes with various dimensions. The cost of the pressing die is significantly reduced, and when molding disks 3 of different dimensions, all that is needed is to replace the ring-shaped pressing die 22, which simplifies the work and reduces manufacturing costs. Reduced.

A ring-shaped angle 4 (FIG. 2) is fitted to the outer edge 8 of the formed iron plate 3, which is fixed by spot welding at certain places to form a collar 2, and is further assembled into a winding drum.

(Effects of the Invention) The winding drum of the present invention configured as described above has the following effects.

(a) The tsuba is made of a circular formed iron plate with a shaft hole in the center and an angle member formed into a ring shape, and the formed iron plate has a plurality of fan-shaped recesses radially provided around the periphery of the formed iron plate to form an umbrella. Since the bone-shaped convex portion is formed, the strength of the formed iron plate itself is increased, and the outer edge thereof is recessed from the inner surface of the flange by the thickness of the side of the angle material, and the ring-shaped portion is formed on the outer edge. Since the angle members are fitted and fixed by spot welding in some places, the strength of the base of the ring-shaped angle member is increased, so even if the steel plate is thin, it has sufficient strength as a drum and is lightweight. is possible.

(b) The fan-shaped recesses, umbrella-shaped protrusions, and outer edges of the formed iron plate can be formed in one step, for example, by pressing, and the outer edge of the formed iron plate and the ring-shaped angle members can be welded by spot welding in some places. Therefore, compared to the conventional method, labor and time can be reduced and manufacturing can be performed easily.

Further, the method for manufacturing the winding drum of the present invention configured as described above has the following effects.

(b) When press-forming the disc-shaped iron plate for the tsuba as described above, use a variety of common molds that have dimensions corresponding to the largest outer diameter of the disc-shaped iron plates for the tsuba of the same shape as the pressing die. with a circular main mold,
In order to use individual ring-shaped pressing molds having predetermined dimensions for recessing the recessed outer edge portion placed thereon, fan-shaped recesses with different outer diameters and the same number and shape, and umbrella ribs are used. For forming various types of forming iron plates for flanges having shaped convex portions, it is only necessary to prepare only one main die and each simple ring-shaped die, so the cost of the die is significantly reduced. In addition, when forming formed iron plates of different dimensions, it is only necessary to replace the ring-shaped press die, so the press work is simple and inexpensive, and it is easy to manufacture winding drums for small lots of a wide variety of products. It can be manufactured at low cost.

(b) In response to changes in load capacity due to the use of a common circular main die, it is sufficient to simply change the thickness of the iron plate material used, and the load capacity can be easily increased.

(c) The winding drum manufactured by the method of the present invention has the same effects as the winding drum of the present invention described above, and provides an appropriate manufacturing method thereof.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a conventional winding drum. Figure 2 A, B, and C are views showing an embodiment of the drum of the present invention, where A is a side view, B is a partially cutaway front view, and C is a cross-sectional view showing a circularly formed iron plate of the tsuba. be. Figures 3A and 3B are diagrams for explaining an embodiment of the method of the present invention, where Figure A is a top view with the upper mold removed, and Figure 3 shows the state of the disc-shaped formed iron plate taken out from the pressing mold. FIG. FIG. 4 is a partial top view showing another embodiment of the drum of the present invention. 1... Body part, 2... Tsuba, 3, 3... Disc-shaped formed iron plate,
4, 12...Angle material, 5...Shaft hole, 6...Sector-shaped recess, 7...Protrusion, 8...Outer edge, 9, 13, 14...Joint surface, 10...Shaft hole ring, 11...Donut-shaped iron plate, 15 ...Bending part, 16...Plane center part, 17...
Groove, 21...Circular main die, 22, 23...Ring shaped die, t...Thickness.

Claims (1)

[Scope of Claims] 1. In an iron drum, the flange is composed of a circular formed iron plate with a shaft hole in the center and an angle member formed into a ring shape, and the circular formed iron plate has a plurality of holes on its periphery. An umbrella-shaped convex part is formed by providing fan-shaped concave parts radially, and the outer edge part thereof is recessed from the inner surface of the collar by the length of the side of the angle material, and the outer edge part is formed with the ring-shaped angle part. A winding drum characterized by fitting materials and fixing them by spot welding in some places. 2 A plurality of fan-shaped recesses are radially provided in the peripheral part to form an umbrella-shaped convex part, and the outer edge of the convex part is recessed from the inner surface of the collar by the thickness of the side of the ring-shaped angle material. When press-forming the disc-shaped iron plate for the tsuba, a common circular main mold with dimensions corresponding to the largest outer diameter of the disc-shaped iron plates for the tsuba of the same shape is used as the pressing die. , and individual ring-shaped pressing molds having predetermined dimensions for recessing the recessed outer edge, which are placed thereon, and then the ring-shaped angle material is placed on the outer edge. A method for manufacturing a winding drum characterized by fitting and fixing by spot welding in some places to create a collar.