JPS5912377B2 - Manufacturing method of sheet metal poly V pulley - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a poly V pulley made of sheet metal and having a plurality of grooves arranged at a predetermined pitch on a peripheral wall thereof.

Recently, poly-V vents have been developed to replace V-belts (in which multiple protrusions are formed on the inner surface of the belt along the running direction of the belt and engage with the V-grooves of poly-V pulleys). Various poly-V pulleys for poly-V belts have been developed.The method for manufacturing these poly-V pulleys is to preform the peripheral wall of a cup-shaped sheet metal material into a corrugated cross-sectional shape with a plurality of troughs on the outer surface. After that, the peripheral wall is compressed in the axial direction, and then finish-formed into a predetermined V-groove by a rolling process in which a finish-forming roller is pressed against each valley on the outer surface of the peripheral wall. .

By the way, in the case of such manufacturing technology, there is a problem with the support of the lower rotary support type, which is rotated at an eccentric position with respect to the cup-shaped material, in the preforming and rolling processes. 10 was pressed by the preliminary and final forming rollers, causing bending and deformation, which had an inconvenient effect on product accuracy.

The present invention has been made in view of the above-mentioned actual situation, and its purpose is to prevent deflection deformation due to the pressure of the eccentric lower rotation support type preforming roller and finishing forming roller during the preforming and rolling process 15. It is an object of the present invention to provide a method for manufacturing a poly V pulley made of sheet metal, which can prevent the above problems and improve product precision.

20, the present invention will be explained below with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 to 10. To explain this embodiment, first, a cup-shaped material 1 shown in FIG. 1 is made from a sheet metal material by press working or the like. Shape. This cup-shaped material 251 has a shape in which a large-diameter peripheral wall portion 4 is connected to a small-diameter cup portion 2 via a step portion 3 . Then, the peripheral wall 4 of this cup-shaped material 1 is preformed by a preforming roller 12, and the peripheral wall 4 has a plurality of grooves 6, for example 4 grooves, for example 30, on the outer surface side as shown in FIG. It is formed into a cross-sectional wave shape with...

Next, the corrugated peripheral wall portion is compression molded in the axial direction, in other words, the corrugated peripheral wall portion 4 is folded into a zigzag shape 35 as shown in FIG.

Then, each valley part 6 of the peripheral wall part 4 which is finally folded...
The predetermined V-groove 7 is formed by rolling processing using the finishing roller 33.
... to obtain the desired sheet metal polyp 5 shown in FIG.

It should be noted that the polyp 5 having the predetermined poly V grooves 7 formed as described above has four convex stripes 9 along the running direction of the belt on the inner surface of the belt, as shown in FIG. The poly V-belt 8 formed with... has each convex strip 9... formed in each V-groove r.
...is engaged and wound.

Here, we will explain each of the above-mentioned molding processes in detail.
The preforming of the peripheral wall portion 4 of the cup-shaped material 1 is performed as shown in FIGS.
While being supported by the lower pair of rotary support molds 10 and 11 and rotating around the axis, the inner and outer circumferential surfaces of the peripheral wall portion 4 of the cup-shaped material 1 are rolled onto a pair of preforming roll surfaces 11 having a corrugated cross section.
This is done by applying pressure with a and 12a. That is, the lower rotary support mold 11 is formed with an outer circumferential surface having an outer diameter smaller than the inner diameter of the peripheral wall 4 as the internal preforming roll surface 11a, and is driven at an eccentric position on the preforming roller 12 side with respect to the cup-shaped material 1. It is rotated so that the roll surface 11a is brought into contact with the inner peripheral surface of the peripheral wall portion 4. A preforming roller 1 having an external preforming roll surface 12a on its outer peripheral surface
2, press the peripheral wall portion 4 from the outer surface side, and press each roll surface 11a.
, 12a forms the peripheral wall portion 4 into a corrugated cross-sectional shape having troughs 6. Then, the side surface 11b of the lower rotary support mold 11 on the opposite side to the eccentric direction, that is, on the opposite side to the preforming roller 12, is attached to the fixed frame 13.
The lower rotating support mold 11 is supported by a rotatable presser roller 14 pivoted on the lower rotary supporting mold 11 to prevent it from being bent and deformed in the pressing direction by the preforming roller 12. Next, the compression molding of the peripheral wall part 4 is carried out in the axial direction in each valley part 6 formed in the peripheral wall part 4 of the cup-shaped material 1, as shown in FIG. Auxiliary forming rollers 16 that are movable and wound along the rotational direction and elastically biased in the direction of separation by a spring material 15 made of, for example, a coil spring.
, 16', each outer peripheral edge 16c. , 16d are inserted.

That is, the upper and lower parts compress the peripheral wall part 4 from both the upper and lower sides.
A pair of rotary pressing molds 17, 18, a receiving mold 19 waiting movably up and down on the inner circumferential side of the peripheral wall 4, and an auxiliary forming roller 1.
6, 16/, respectively, auxiliary forming roller devices 20,
We have 20 available. The upper rotary pressing die 17 is provided so as to be movable up and down, and by moving downward, presses the entire cup portion 2 and stepped portion 3 of the cup-shaped material 1 from the outside. The lower rotating press mold 18 is fixedly arranged and has a substantially bottomed cylindrical shape with an open top surface.
The opening edge 4a of the peripheral wall 4 of the cup-shaped material 1 is brought into abutment with a stop 21 formed over the entire circumference at the upper end of the peripheral wall. That is, as shown in detail in FIG.
1 has an abutting step surface 21a that follows the shape of the inclined surface 41 so as to abut during this compression molding, and the hanging end 4a'' of the inclined surface 41 abuts during this compression molding to provide a stopping action for the end 4a1. It is configured with a stop abutment recess 21b that prevents the end 4a'' from warping outward, and the outer inner surface of the stop abutment recess 21b has a flank 21b that gradually tapers outward as it goes upward. ' is formed, and the peripheral wall part 4
The opening end edge 4a has a shape that follows the abutment step surface 21a, and is prevented from warping outward by the stop abutment recess 21b, so that it is molded into the correct shape. Therefore, the cup-shaped material 1 can be easily taken out from the lower rotating press mold 18 after compression molding. Further, the receiving mold 19 is formed to entirely receive the inner sides of the cup portion 2 and the step portion 3 of the cup-shaped material 1, and when compression molding the peripheral wall portion 4 of the cup-shaped material 1, the peripheral wall portion 4 is placed on the inner peripheral side. It has a circular head 19a that is supported from above, and a drive shaft 19b that drives the circular head 19a vertically and rotationally. Next, the auxiliary forming roller devices 20, 20 will be explained. The auxiliary forming roller devices 20, 20 are provided opposite to each other on the left and right sides of the lower rotary pressing mold 18, and each auxiliary forming roller device 20 is provided with a support parallel to the upper and lower rotary pressing molds 17, 18. A plurality of, for example two, auxiliary forming rollers 1 are mounted on the shaft 22.
6 and 1f1 are arranged upwardly and downwardly to form a pair and are provided movably in the axial direction. That is, the support shaft 22 is connected to the base arm portion 24 of the holding member 24 that is supported by the fixed frame 23 so as to be movable back and forth.
a and the lower arm part 24b, this support shaft 22 has a threaded part 22a formed at its upper end projecting above the upper arm part 24a, and a presser plate 25 screwed into this threaded part 22a. The support shaft 22 is fixed to the upper arm part 24a with setscrews 26, 26, and a nut 27 is screwed into the threaded part 22a protruding onto the presser plate 25, thereby fixing the support shaft 22 to the upper arm part 24a. By loosening the nut 27 and rotating the support shaft 22 with respect to the presser plate 25, the height position of the support shaft 22 relative to the upper arm portion 24a and the lower arm portion 24b is set. Further, a flange portion 22b is formed to protrude from the support shaft 22, and a boss portion 16a that protrudes downward from the upper auxiliary forming roller 16 is provided on a portion of the support shaft 22 below the flange portion 22b with a bearing 28 interposed therebetween. The boss part 16a' of the lower auxiliary forming roller 1V is mounted on the outer peripheral surface of the boss part 16a of the upper auxiliary forming roller 16 with a bearing 28' interposed therebetween. The auxiliary forming rollers 16 and 1V are mounted so as to be movable in the upper and lower axial directions and rotatable around the axis, and the lower ends of these auxiliary forming rollers 16 and 1V are placed on a flange-like member 29 that is loosely fitted onto the support shaft 22. Further, a coil spring 30 is interposed between the brim member 29 and the lower arm portion 24b, and the boss portion 16a of the upper auxiliary forming roller 16 hits the lower surface of the flange portion 22b of the support shaft 22. to be done. Also,.
Annular grooves 16b, 16d are formed on the opposing inner surfaces of the auxiliary forming rollers 16, 16' so as to surround the support shaft 22, and a spring material 15 whose upper and lower ends are held in these annular grooves 16b, 16V rotates. The pair of auxiliary forming rollers 16,
16' is elastically biased in the direction of separation. The outer peripheral edge portions 16c, 16d of these auxiliary forming rollers 16, 16/ are shaped into a pointed triangular cross section that approximates the V-groove 7 during final finishing forming. During compression molding, as shown in FIG.
Set.

At this time, as shown in FIG.
In this state, the initial position of the cup-shaped material 1 is set. Further, as shown in FIG. 7, in the auxiliary forming roller devices 20, 20, the upper auxiliary forming roller 16 is located at a position where it is stopped by the flange portion 22b of the support shaft 22 whose height position is set. , and each lower auxiliary forming roller 16' is connected to the upper auxiliary forming roller 1.
The upper and lower auxiliary forming rollers 16 are placed on the flanged member 29 whose height position is set at the lower end of the boss portion 16a of 6.
, 16/ is set.

From this state, as shown in FIG.
7 is lowered, the cup part 2 and step part 3 of the cup-shaped material 1 are held between the upper rotary pressing mold 17 and the receiving mold 19, and the peripheral wall part 4 is held on both upper and lower sides by the upper and lower rotary pressing molds 17 and 18. While being compressed, the receiving mold 19 is rotationally driven to rotate the cup-shaped material 1 together with the upper rotary pressing mold 17 in the circumferential direction of its peripheral wall portion 4. In this operation, the upper and lower auxiliary forming rollers 16 and 16' in the auxiliary forming roller devices 20 and 20 are moved forward, and the outer peripheral edges 16c and 16 of the auxiliary forming rollers 16 and 15 are moved forward.
The cI is inserted in advance into each of the four grooves 6 at a predetermined depth position. Then, as a result of this compression, the receiving mold 19 gradually descends relative to the lower rotary pressing mold 18, and as shown in FIG.
・Auxiliary forming rollers 16, 16' inserted into each of them.
The peripheral wall portion 4 is folded in a zigzag shape to follow the outer peripheral edge portions 16c and 16c'. In other words, each trough 6 to be compression molded is the outer peripheral edge 16 of the auxiliary forming rollers 16, 16'.
c and 16c' prevent unnecessary bending and deformation, and the sheets are arranged in an orderly manner at a predetermined pitch. In this case, the inner circumferential side of the circumferential wall 4 is supported in contact with the outer circumferential surface of the circular head 19a of the receiving mold 19 to restrict deformation toward the inner circumferential side, and both the inner and outer circumferential sides of the circumferential wall 4 are Form into the shape of. Also, during this compression molding, the opening edge 4a of the peripheral wall 4 of the cup-shaped material 1 is
is brought into contact with the stop part 21 of the lower rotary pressing mold 18,
The inclined surface 4a' of the opening edge 4a abuts against the abutting stepped surface 21a of the stop 21, and the end 4a'' of the opening edge 4a meets the stop 21.
By abutting against the stop abutment recess 21b of No. 1, the opening end edge 4a has a shape that follows the abutment step surface 21a of the stop 21, and moreover, the opening end edge 4a has a shape that follows the abutment step surface 21a of the stop 21, and also fits into the stop abutment recess 21b of the stop 21. This prevents it from warping outward and allows it to be molded into the correct shape. Furthermore, in the compression molding described above, the distance between the auxiliary forming rollers 16, 1f1 forming the respective pairs of the auxiliary forming roller devices 20, 20 gradually becomes smaller as the peripheral wall portion 4 of the cup-shaped material 1 is compressed. Said spring material 1
It is absorbed by the compressive deformation of 5, and the spring material 15
are each auxiliary forming roller 16, 16! Since the spring material 15 is wound along the rotational direction of the auxiliary forming rollers 16, 16/1V, it is possible to prevent the spring material 15 from bending and deforming due to the rotation of the auxiliary forming rollers 16, 16/, and to prevent the spring material 15 from applying elastic pressure to the auxiliary forming rollers 16, 1V. The effect can be stabilized. After the compression molding is completed, as shown in FIG. The cup-shaped material 1 is taken out from above. At this time, lower rotary pressing mold 1
The opening edge 4a of the peripheral wall 4 of the cup-shaped material 1 is removed from the stop 21 of 8, but since the abutment recess 21b of the stop 21 is formed with a relief surface 21V, the cup-shaped It is easy to take out the element 1 from the lower rotary pressing mold 18. In the final rolling process, as shown in FIGS. 9 and 10, the cup-shaped material 1 is supported by a pair of upper and lower rotating support dies 31 and 32 for finishing and rotated around the axis. While doing so, the peripheral wall portion 4 folded into a zigzag shape in the previous step is
By supporting the poly groove finishing roll surface 33a from the outer peripheral surface side and the receiving roll surface 32a from the inner peripheral surface side, the poly V-groove 7... is finished formed.

That is, the lower rotary support mold 32 is formed with an outer diameter smaller than the inner diameter of the peripheral wall portion 4 as a receiving roll surface 32a on its outer peripheral surface, and is driven and rotated at an eccentric position on the finish forming roller 33 side with respect to the cup-shaped material 1. , the roll surface 32a is attached to the inner peripheral surface of the peripheral wall portion 4. A finishing forming roller 33 having regular pitch protrusions 33b on the outer peripheral surface as a poly-groove finishing roll surface 33a.
With each protrusion 33b... aligned with each valley 6..., a predetermined poly V groove 7... Shape. Then, the side surface 32b of the lower rotation support mold 32 opposite to the eccentric direction, that is, the side opposite to the finish forming roller 33, is supported by a rotatable presser roller 35 pivoted to the fixed frame 34, and the lower rotation support is supported. The mold 32 is a finishing forming roller 33
This prevents it from bending in the direction of pressure. However,
As mentioned above, each valley 6 of the peripheral wall 4 of the cup-shaped material 1
Auxiliary forming rollers 1 each movable in the axial direction
Since compression molding is performed with the outer peripheral edges 16c and 16d of 6 and 1V inserted, each valley 6... Unnecessary bending deformation is restricted, and the peripheral wall portion 4 can be accurately folded into a zigzag shape.

Therefore, the pitches of the troughs 6 of the peripheral wall 4 are made uniform, thereby facilitating the subsequent rolling process. In addition, since the peripheral wall portion 4 is bent and compressed into an orderly shape without collapse,
The mold surrounding the inner and outer parts of the peripheral wall portion 4 is not unevenly inserted into the mold, and the mold can be easily removed. Also, the 11th
Other embodiments of the invention are shown in Figures 1-13.

In this embodiment, both end edges 4a, 4b of the peripheral wall 4 of the cup-shaped material 1 are made higher than the ridges 36, 36, and the ridges on opposite sides of the end edges 4a, 4b are made higher than the peaks 36, 36. 11 is an example in which the present invention is applied to the manufacture of a single sheet metal polyp in which stepped portions 37a and 37b are formed at almost the same height positions as 36 and 36 in a direction that moves away from each other, and FIG. Figure 12 A, B shows the preforming according to
13 shows compression molding using auxiliary forming rollers 16 and 15, and FIG. 13 shows rolling processing using finishing forming roller 33. In FIGS. 11 to 13, parts corresponding to those in FIGS. 1 to 10 described above are given the same reference numerals. In addition, in the above embodiment, two auxiliary forming rollers used in compression molding are arranged in pairs on the top and bottom, but this is a pair of auxiliary forming rollers in which three or more are arranged on the top and bottom. The present invention can also be carried out by using the auxiliary forming rollers and interposing spring members wound along the rotational direction between the auxiliary forming rollers to elastically bias the auxiliary forming rollers in the direction of separation.

Incidentally, the peripheral wall portion 4 of the single polyp 5 manufactured by the method of the present invention
The shapes of both end edges of can be modified in various ways other than those of the above-mentioned embodiments.

As explained above, in the present invention, after the peripheral wall portion of the cup-shaped material is preformed into a corrugated cross-sectional shape having a plurality of troughs by pressing a preforming roller on the outer surface side, the peripheral wall portion of the cup-shaped material is A poly V pulley made of sheet metal, which is compressed in the axial direction, and then formed into a predetermined groove by a rolling process in which each trough on the outer surface of the peripheral wall is pressed with a finishing roller to these troughs. In the manufacturing method, the preforming and rolling processes are performed on the opposite side to the eccentric direction of the lower rotary support mold, which is rotated at eccentric positions on the preforming roller side and the finishing forming roller side with respect to the cup-shaped material, respectively. Since the side surfaces are supported by the presser rollers, each lower rotary support mold is supported by the presser rollers,
It is possible to prevent bending and deformation in the pressing direction by the preforming roller and the final forming roller, thereby improving product precision.

[Brief explanation of the drawing]

1 to 10 show one embodiment of the present invention, in which FIG. 1 is a sectional view showing the overall shape of the cup-shaped material, and FIG.
The figure is a partial sectional view showing the peripheral wall of the cup-shaped material after preforming, Figure 3 is a partial sectional view showing the peripheral wall of the cup-shaped material after compression molding, and Figure 4 is a sheet metal polyester after rolling. 5 and 6 are partial cross-sectional views showing the peripheral wall of the V-pulley; FIGS. 5 and 6 show the preforming process; FIG. 5 is a partially sectional front view; FIG. 6 is a plan view of the same; and FIG. ,,1, is a front sectional view showing the compression molding process in its process order, FIG. 8 is a partial sectional view showing the same compression process in an enlarged manner, FIGS. Figure 9 is a partially sectioned front view;
11 to 13 show other embodiments of the present invention, FIG. 11 is a partial sectional view showing the preforming process, and FIGS. 12A and 12B are the compression molding steps. FIG. 13 is a partial sectional view showing the rolling process. 1... Cup-shaped material, 4... Peripheral wall portion of cup-shaped material, 5... Sheet metal poly V pulley manufactured by the method of the present invention, 6... ...Tanibe, 7...
... Predetermined groove of poly V pulley, 8 ... Poly belt, 11 ... Lower rotation support type, 11b ...
... Side surface opposite to the eccentric direction of the lower rotation support type, 12
...Preforming roller, 32...Lower rotation support type, 32b...Side surface of the lower rotation support type opposite to the eccentric direction, 33... - Finishing forming rollers, 14, 35... Pressing rollers.

Claims (1)

[Claims] 1. After preforming the peripheral wall of the cup-shaped material into a corrugated cross-sectional shape having a plurality of troughs by pressing a preforming roller on the outer surface side, the peripheral wall of the cup-shaped material is compressed in the axial direction, Thereafter, each valley on the outer surface of the peripheral wall is formed into a predetermined V by a rolling process in which finishing rollers are pressed against these valleys.
In the method for manufacturing a sheet metal poly V pulley formed into a groove, the preforming and rolling processes are performed by rotating at eccentric positions on the preforming roller side and the finishing forming roller side with respect to the cup-shaped material, respectively. Bottom rotation support type,
A poly V made of sheet metal, characterized in that the side surface opposite to the eccentric direction is supported by a presser roller.
How to manufacture pulleys.