JPS58163538A - Manufacture of thin-plate poly v-pulley - Google Patents

Abstract

PURPOSE:To manufacture a highly accurate thin-plate poly V-pulley, by preliminarily forming a basal edge part at the connecting part of peripheral wall and bottom wall of a cuplike material before corrugating the peripheral wall of the material. CONSTITUTION:A bottomed cylindrical cuplike material 1 is formed from a circular material made by blanking a steel plate. This material 1 is supported by a pair of upper and lower rotary preliminary forming dies 13, 14. While rotating the forming dies 13, 14, the inner and outer peripheral faces of peripheral wall 4 of the material 1 are supported by the roll face 14a of the forming die 14 and the roll face 15a of the side wall preliminary forming roll 15. At the same time, the forming roll 13 is lowered to press the peripheral wall 4 to the axial direction, and an opening edge part 6' is formed in an opening side edge part 4a. Then, the forming die 13 is further lowered and the connecting part 4b of the peripheral wall 4 is pressed and worked by the basal edge preliminary forming part 13b of the forming die 13 and the basal edge preliminary forming part 15c of the forming roller 15 to form a basal edge part 7'. Then, crest parts and trough parts are formed on the peripheral wall 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an IJ with a plurality of holes lined up at a predetermined pitch on the outer surface of a peripheral wall.
The present invention relates to a method of manufacturing a sheet metal poly V pulley having a V groove.

Recently, poly-V belts have been developed to replace belts (with multiple protrusions on the inner surface of the belt that engage with the poly-V grooves (each groove width is about 3.5 mm) of the poly-V pulley along the running direction of the belt. A variety of poly-V pulleys for this poly-V belt have been developed.

By the way, in the poly V pulley mentioned above, since it is necessary to simultaneously engage the plurality of protrusions formed on the inner surface of one poly V belt with the poly V groove of the poly V pulley, the accuracy of each IJ V groove is 5.
Therefore, the pitch, width of each V-groove, diameter of each V-groove, etc. are required to be finished with high precision for the V-groove.

In order to meet such demands, the applicant presses the circumferential wall of a cup-shaped material from the outer surface side with a corrugating roller to form a corrugated cross-sectional wave shape having peaks and troughs on the outer surface of the circumferential wall. After forming, the peripheral wall of the cup-shaped material is compressed in the axial direction with the outer peripheral edge of an auxiliary forming roller movable in the axial direction inserted into each of the valleys, and then A method for manufacturing a sheet metal poly V pulley in which each trough on the outer surface of the peripheral wall is formed into a predetermined po IJ V groove by a rolling process in which a finish forming roller is pressed against these troughs.
(Japanese Patent Application No. 54-113820). Although this manufacturing method has made it possible to significantly improve product precision, there is a problem in that product precision is unstable due to variations between each V-groove or between products.

The present invention was made in view of the above-mentioned circumstances, and its purpose is to further improve product accuracy by reducing the variation in precision between each V-groove and the precision between products. It is an object of the present invention to provide a method for manufacturing a sheet metal type POIJV pulley.

To explain the present invention in detail, a bottomed cylindrical cup-shaped material is formed from a sheet metal material by press working or the like. Next, the continuous portion between the circumferential wall and the bottom wall of this cup-shaped material is pressed so that the inner surface of the circumferential wall and the inner surface of the bottom wall are pressed together, and the adjacent portion is adjacent to the continuous portion. The proximal edge, which will become the side wall of the valley, is preformed.

Next, while this preformed proximal edge is supported under pressure by the upper rotating support mold and the finishing roller, corrugations are formed on the peripheral wall of the cup-shaped material, and ridges are formed on the outer surface of the peripheral wall. The corrugation is formed into a corrugated cross-sectional shape having alternating portions and troughs.

Next, the corrugation is performed by inserting the outer peripheral edge of an axially movable auxiliary forming roller into each trough of the formed peripheral wall and suppressing the upper rotation of the preformed proximal edge. While supported by the mold and the auxiliary forming roller,
The peripheral wall portion of the cup-shaped material is compression-molded in the axial direction.

Finally, the preformed proximal edge portion and the compression molded peripheral wall portion are finished formed by rolling with a finish forming roller to manufacture a sheet metal poly V pulley.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 1 to 11. In this embodiment, the present invention is applied to the production of a sheet metal IJV pulley having ears on both end edges of the peripheral wall.

A circular blank plate punched from a steel plate is drawn without being separated, and the first
A cylindrical cup-shaped material 1 with a bottom as shown in the figure is molded.

Before forming the corrugations on the peripheral wall 4 of the cup-shaped material 1, the connecting portion 4b between the peripheral wall 4 and the bottom wall 3 of the cup-shaped material 1 is formed so that they are connected as shown in FIG. The inner surface of the peripheral wall section 4 and the inner surface of the bottom wall section 3 are pressed together so that they are pressed together to preform a proximal edge 7' that will become a side wall of the valley section 9 adjacent to the connecting section 4b. In this case, the proximal edge 7
' is preformed to protrude radially outward from the peripheral wall part 4 in order to form the ear part 7 to be described later, and the proximal edge part 7' is drilled; The A stepped portion 21b is preformed as shown in FIG.

On the other hand, the opening edge 4a of the peripheral wall 4 is enlarged to form an opening edge a 6 that protrudes radially outward from the peripheral wall 4.
' is formed.

The method of forming the opening end edge 6' and the base end edge 7' will be described in detail. As shown in FIGS. While rotating the rotor-equipped mold 13.14 while supporting the mold 13.14, the inner and outer peripheral surfaces of the peripheral wall 4 of the cup-shaped material 1 are preformed with the roll surface 14a of the lower rotary preform 14. roller 1
At the same time, the northern rotary preforming mold 13 is lowered to press the peripheral wall portion 4 in the axial direction. Then, a downward pressing force is applied to the upper rotary preforming mold 13, whereby the opening end edge 6' protrudes radially outward by expanding the opening end edge.
to form. Then, the upper rotary preform 13 continues to descend, and the abutting end 14 of the lower rotary preform 14 is removed.
bJ- With the peripheral wall portion 4 of the cup-shaped material 1 being supported in the axial direction between the lower surface 13a of the upper rotary preforming mold 130, the base end preforming portion 13b of the upper rotary preforming mold 13
and the proximal end preforming part 15 of the side wall preforming roller 15 (and the connecting part 4b of the peripheral wall part 4 is compressed to form a proximal end edge 7' that protrudes outward in the radial direction, as shown in FIG. 7). The molding is performed as shown in FIG. 7. When the mold 13 equipped with a partial rotor is lowered to the lower limit position, as shown in FIG. At the same time, the abutting surface 14J of the lower rotary preforming mold 14 abuts the lower tapered surface 15e of the side wall preforming roller 15, and the upper rotating preform has descended to the lower limit position. Since the distance between the mold 13, the lower rotor, and the uneven mold 14 is kept constant through the side wall preforming roller 15, the inner surface of the peripheral wall 4 and the inner surface of the bottom wall 3 are kept in a predetermined state. In addition, a rotatable presser roller 17 is provided which is pivoted to the seam 16 (fixed on the opposite side of the side wall preforming roller 15), and this presser roller 17 is fixed to the side opposite to the side wall preforming roller 15. It is brought into contact with the side surface 14c to prevent the F section rotor-equipped forming mold 14 from deflecting to the side opposite to the side wall preforming roller 15.

The corrugation of the peripheral wall portion 4, in which the proximal edge 7' has been applied to the connecting portion 4b of the cup-shaped material 1 as described above, is formed by molding the cup-shaped material 1 with a pair of upper and lower rotating support molds 18° and 19. While supporting and rotating around the axis, insert the inner and outer peripheral surfaces of the peripheral wall portion 4 of the cup-shaped material □.

A pair of outer corrugation forming roll surfaces 19a with a corrugated cross section.

This is done by applying pressure with 20a. In other words, the internal corrugation forming roll surface 1 (Jl) formed on the outer peripheral surface of the lower rotary support die 19 is formed to have an outer diameter smaller than the inner diameter of the peripheral wall portion 4, and The corrugation forming roller 2 is driven and rotated at an eccentric position so that the roll surface 19B is attached to the inner circumferential surface of the peripheral wall portion 4.The corrugation forming roller 2 has an external corrugation forming roll surface 20a on the outer circumferential surface.
o, the peripheral wall portion 4 is pressed from the outer surface side, and each roll surface 19a
, 20a forms the peripheral wall portion 4 into a corrugated cross-sectional shape having alternating peaks 8 and troughs 9, as shown in FIGS. 3 and 8. Then, during molding, this corrugation is applied to the base end and edge 7' as shown in FIG.
The corrugation of the peripheral wall portion 4 is formed while it is held between the base end support portion 18b of the upper rotary support mold 18 and the base end support portion 20b of the corrugation forming roller 20. As a result, the upper end portion of the peripheral wall portion 4 is securely fixed, and the peripheral wall portion 4
Unnecessary deformation in the upward direction is restricted. Further, the opening end edge 6' of the peripheral wall 4 is bent inward by the pressing of the folded Flli's 20'c provided on the corrugation forming roller 20, and the U-shaped structure of the folded part 20C allows The lower end portion of the peripheral wall portion 4 is supported.

Note that the side surface 190 of the lower rotation support mold 19 opposite to the eccentric direction, that is, the side opposite to the corrugation forming roller 20, is supported by a rotatable presser roller 23 that is pivoted to the fixed frame 22, and the lower rotation support is performed. This prevents the mold 19 from bending in the direction of pressure by the corrugation forming roller 20.

Next, compression molding is performed on the circumferential wall portion 4 formed to have a corrugated cross-sectional shape, as shown in FIG.
auxiliary forming rollers 25 each movable in the axial direction;
25', 25'' outer peripheral edge portions 25a, 25'a, 25
``Do this with a inserted.

That is, a pair of upper and lower rotary pressing molds 26 and 27 compress the peripheral wall portion 4 formed into a corrugated cross-sectional shape from the axial direction.
, a receiving mold 28 waiting on the inner peripheral side of the peripheral wall portion 4, and three auxiliary forming rollers 25, 25' disposed in the circumferential direction of the cup-shaped material 1.

25". Then, first, the receiving mold 28 is raised, and the cup-shaped material 1 formed by the corrugation is held between the upper and lower rotation suppressing molds 26 and 27. ,
The proximal edge 7' of this cup-shaped material 1 is connected to the upper rotation suppressing mold 2.
6 and the base end support part 25b of the uppermost auxiliary forming roller 25, and on the other hand, the distal end edge S/a of the circumferential wall part 4 of the cube-shaped material l is held at the bottom rotary press die 27. Abut against the abutting ends 27a of. Further, the auxiliary forming roller 25. The outer peripheral edge portions 25a, 25'a, and 25''a of 25' and 25'' are respectively inserted into each valley portion 9 of the peripheral wall portion 4.

Then, while rotating the upper and lower rotation suppressing molds 26 and 27 about their axes, the upper rotation suppressing mold 26 is lowered, and at the same time, the receiving mold 28 is also lowered, and the peripheral wall portion 4
The paper is folded into a zigzag shape as shown in FIG. As a result, each valley portion 9 of the peripheral wall portion 4 is formed by the auxiliary forming roller 25,
25'.

25'' outer peripheral edge 25a, 25'a, 25''a
Supported by.

The base end edge 7' is compressed while being held between the uppermost auxiliary forming roller 25Ω base support part 25b and the base support part 26a of the upper rotary pressing mold 26. As a result, the peripheral wall portion 4 is compressed in the axial direction without unnecessary deformation.

In the final rolling process, as shown in FIGS. 10 and 11, the cup-shaped material 1 is supported by a pair of upper and lower rotating support molds 40 and 41 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 V-groove finishing roll surface 42a from the outer circumference side and the roll surface 41a from the inner circumference side,
Final molding is performed to form a V-groove 1o as shown in FIG. In other words, the support on the outer peripheral surface of the lower rotary support mold 41 is low, and the step surface 4 is
1a is formed to have an outer diameter smaller than the inner diameter of the peripheral wall portion 4, and is driven and rotated at an eccentric position on the finish forming roller 42 side with respect to the cup-shaped material 1, so that the roll surface 41a is attached to the inner peripheral surface of the peripheral wall portion 4. come into contact with and ■ Groove finishing roll surface 42a.
A predetermined V-groove 10 is formed by a rolling process in which the finishing forming roller 42 is pressed against the peripheral wall 4 with each protrusion 42b on the outer circumferential surface of the groove 9 aligned with each valley 9.

In this case, as shown in FIG. 10 and FIG. This is done while being held between the supporting parts 42 (. By suppressing the proximal support portion 42c, a step 5 is formed on the inner surface thereof.
2ib, while the frontage edge 6' is formed by the protrusion 41c of the outer circumferential surface 41b of the lower rotary support mold 41 and the finishing roller 42, as shown in FIG. and the peripheral groove portion 42e of the outer circumferential surface 42d of
A is formed continuously from the circumferential groove part 42e of the finishing forming roller 42 toward the outer circumferential surface 41b of the lower rotary support mold 41, and the finishing forming roller 42 is pressed while making sure to abut against the stepped surface 42f. Finish molding is performed to form a predetermined ear portion 6 having a stepped portion 21a on the side surface.

The stepped portions 21a and 21b are the side surfaces 11a of the IJ'V belt 11, as shown in FIG.

11b serves as a relief to prevent contact with the ear portion 6.7 of the poly V pulley 5, and this prevents rotation due to the poly V belt 11 coming into contact with the ear portion 6.7 of the poly V pulley 5. This prevents a decrease in transmission efficiency and also prevents damage to the poly V belt 11.

Further, a rotatable pressing roller 44 pivoted to a fixed frame 43 is in contact with a side surface 41b' of the lower rotary support mold 41 on the opposite side of the finishing forming roller 42. is prevented from bending in the pressing direction by the finishing forming roller 42.

It should be noted that the present invention is of course not limited to the shape having the stepped portions 21 a and 2 l b at the ear portion 6°7 as in the above embodiment; for example, as shown in FIG. 12. It is also possible to use a poly-V pulley 5' with escape slopes 21a' and 2ib that move away from each other, or a poly-V pulley 5'' with no ears 6, 7 formed at all as shown in FIG. It is.

Note that other details in FIGS. 12 and 13 are the same as those in FIGS. 1 to 11, so the same reference numerals are used and explanations thereof will be omitted.

As described above, in the present invention, before the corrugation is formed, the connecting portion between the peripheral wall portion and the bottom wall portion of the cup-shaped material is crimped to the inner surface of the peripheral wall portion and the inner surface of the bottom wall portion. It is characterized in that the proximal end edge portion, which becomes the side wall of the valley portion adjacent to the connecting portion, is preformed by performing a state of pressure. Therefore, if this proximal edge is formed into a cup-shaped material in advance before waving, it is possible to form the proximal edge into a cup-shaped material in advance in each of the subsequent steps (the waving is during the forming process,
When forming each V-groove in the compression molding process and the finishing molding process, the base edge acts as a reference point to determine the dimensional accuracy of each V-groove, and the accuracy variation between each V-groove and the accuracy between products. It is possible to further improve product accuracy by reducing variations.

Further, according to the present invention, in the step after preforming the proximal edge, a conventional inner mold supporting the inner surface of the peripheral wall and the inner surface of the bottom wall in the connecting portion of the cup-shaped material is formed. This eliminates the need for such protrusions, which eliminates the inconvenience of lowering product accuracy due to breakage of such protrusions.

[Brief explanation of the drawing]

Fig. 1 to Fig. 11 show an embodiment of the present invention, Fig. 1 is a sectional view showing the overall shape of the cup-shaped material, and Fig. 2 shows the cup-shaped material after molding of both end edges of the peripheral wall part. FIG. 3 is a partial sectional view showing the peripheral wall of the cup-shaped material after molding, FIG. 4 is a partial sectional view showing the peripheral wall of the cup-shaped material after compression molding, and FIG. FIG. 6 is a partial cross-sectional view showing the peripheral wall of the sheet metal poly V pulley after rolling. FIG. 6 is a partially sectional front view showing the formed state of both edges of the peripheral wall. FIG. 7 is a main view of FIG. 6. FIG. 8 is an enlarged front sectional view of the part, and FIG. 8 is a partially sectional front view showing that the corrugations on the peripheral wall are in a molded state. FIG. 9 (A)
9 is a front sectional view showing the state of compression molding of the peripheral wall portion (second is a front sectional view taken from the II-II line in FIG. 6(A),
Figure 0 is a partially sectional front view showing the state of finished forming by rolling of the peripheral wall part, Figure TI is a front sectional view showing an enlarged section 10^, Figures 12 and 13 are respectively FIG. 6 is a partial sectional view corresponding to FIG. 5 showing another different embodiment. 1. Cup-shaped material, 3. Bottom wall of cup-shaped material, 41. Peripheral wall of cup-shaped material, 4a. Opening side edge of cup-shaped material, 4b. Connecting portion of cup-shaped material, 5・Sheet metal PO IJ V manufactured by the present invention
Pulley, 6'/opening edge, 1.・Proximal edge,
8 Yamabe, 9...Tanibe, lO...PoIJ
Predetermined V groove of V pulley, 20... Wave forming roller, 42... Finish forming roller. Patent applicant: Patent attorney of Kinko Doko Welding Co., Ltd.
Suzue Takashi - No. 1g+ 3 Fig. 2 Fig. 3 M2- No. (°4 Fig. 6 Fig. 12 Fig. 13

Claims (1)

[Claims] The circumferential wall of the cup-shaped material is pressed by a corrugating roller from the outer surface side to form a corrugated cross-sectional shape with alternating peaks and troughs on the outer surface of the circumferential wall, and then moved in the axial direction. The peripheral wall of the cup-shaped material is compressed in the axial direction with the outer peripheral edges of possible auxiliary forming rollers inserted into each of the valleys, and then the valleys on the outer surface of the peripheral wall are compressed into these grooves. A sheet metal PO IJ V that is formed into a predetermined poly V groove by a rolling process in which a finish forming roller is pressed against the troughs.
In the method for manufacturing a pulley, the corrugation is a state in which the connecting portion between the peripheral wall portion and the bottom wall portion 2 of the cup-shaped material is pressed together with the inner surface of the peripheral wall portion and the inner surface of the bottom wall portion before forming. A sheet metal point I characterized in that the proximal edge that becomes the side wall of the valley adjacent to the connecting part is preformed by pressing
JV pulley manufacturing method.