JPS62124042A - Manufacture of multi-grooved v-pulley made of sheet metal, having bearing - Google Patents

Abstract

PURPOSE:To mass-produce a product having a high accuracy by bringing a preform which has been formed in a shape of a cup, to a stepped part working and a bearing supporting part working, and thereafter, forming a V-groove in a wall thickened bulge part which has been formed in a V-groove forming part, and subsequently, pressing a ready-made bearing into a bearing fitting and attaching part. CONSTITUTION:A sheet metal stock of prescribed thickness and outside diameter is brought to deep drawing, and a cup-shaped preform 11 consisting of a base plate part 21 and a rough peripheral wall part 22 is formed. By a preliminary form rolling, an inclined stepped part 31 is formed on the rough peripheral wall part 22, a bearing supporting part 42 and a base plate part 43 are formed by a drawing working, and thereafter, a wall thickened bulge part is formed by an outer drawing die. Subsequently, by a multi-V-groove preliminary forming roller which serves as a wall thickening roller, too, the wall thickened bulge part 51 is thickened, and also a multi-V-groove 61 is formed after forming a reference part 62. In the end, a ready-made bearing 91 is pressed into the bearing supporting part 42. According to this method, a product having a high accuracy can be mass-produced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a sheet metal poly V-boot having a bearing, and more specifically, a predetermined bead n + -7 on the 5th peripheral wall.
% average - ζ; Oil's first jelly Vi delivery method for manufacturing a sheet metal poly V pulley in which a bearing is press-fitted and caulked into the bearing fitting part on the shaft core side connected to the eggplant and the north ζ peripheral wall. This is related to the improvement of.

[Conventional technology]

Conventionally, this type of sheet metal poly-V pulley, that is, a preformed sheet metal material is deep drawn and reverse drawn to form a base part, a peripheral wall part, and a bearing fitting part on the shaft core side, respectively. A plurality of V-grooves, so-called poly V-grooves, arranged at a predetermined pitch are formed on the peripheral wall, and a bearing as a ready-made part is press-fitted and caulked into the bearing fitting part. Poly V pulleys have been commercialized,
For example, it is widely used as an intermediate conduction poly-V pulley in vehicle engine equipment.

As you can see, in manufacturing this conventional sheet metal poly-V pulley with bearings, the above-mentioned base plate, peripheral wall, and shaft core side bearing fitting part are each plastically formed to form a preformed member. 2. Molding a poly V groove on the peripheral wall,
Regarding press-fitting and caulking of ready-made bearings into bearing fitting parts,
Mainly to maintain accuracy after completion, in other words, to match the rotation center of the molded poly V groove as much as possible with the axis of the press-fitted and crimped ready-made bearing, we first installed the bearing at the beginning. A ready-made bearing is press-fitted and caulked into the joint, and then a poly V groove is plastically formed into the peripheral wall.

[Problem that the invention seeks to solve]

However, in the conventional method of manufacturing in this way, the ready-made bearing is first press-fitted into the bearing fitting part and caulked, thereby forming the preformed member itself based on the axis of the ready-made bearing. Centering is performed, and in subsequent molding, here plastic forming of the poly V groove on the peripheral wall, the preformed member is placed in the molding die based on the centered shaft center point. The following problems arise due to the holding and molding operations.

In other words, as is well known, polyv on one peripheral wall
When plastic forming yt, the peripheral wall of the deep-drawn material is further thickened, and then a poly V groove is formed into the thick peripheral wall. Regarding the groove width and groove diameter of the V groove itself, and the pinch interval between poly V grooves, set this to 5/1.
Up to about 00+u+, and especially for the rotation axis,
These walls need to be finished with even higher precision.

During Mizotani forming, the stress applied to the material remains within the material, and due to the influence of this residual stress, it is difficult to obtain the desired rotation center accuracy, which is a disadvantage. is the opposite manufacturing procedure, simply thickening the poly V groove, press-fitting the ready-made bearing into the bearing fitting after each molding of the groove.

Even if you have caulked it, this is the press fit.

Similar defects were caused by the influence of residual stress during caulking.

[Means for solving problems]

In view of these conventional problems, the present invention has been developed to improve mass production by forming a sheet metal poly-V pulley with a bearing as simply and easily as possible from a sheet metal material, and with high precision. Excellent manufacturing method A folded bulge is formed between the peripheral wall part and the supporting wall part, and between the bearing fitting part and the supporting wall part where the ready-made bearing is press-fitted and crimped. 1, connected to the bulge and gently curved inward in a concave shape, and these folded bulges and support wall allow for plastic forming of the poly V groove on the peripheral wall, and It is designed to absorb the internal stress that occurs when press-fitting ready-made bearings, thereby maintaining the desired molding accuracy.

That is, the present invention includes a step of forming a cup-shaped material consisting of a substrate portion and a rough wall portion by deep drawing a sheet metal material, and forming an inclined stepped portion on the rough wall portion. , a step forming step in which the rough wall is divided into a poly V groove molded part on the opening edge side and a preformed part on the substrate side, and the preformed part and the substrate part are reverse drawn and folded inward. By forming an inner folded bulge protruding outward between each of these parts, the preformed part forms a bearing support part, and the base part forms a bear part, respectively. The shaped grain forming step and the inverted base plate part of the bearing support part 9 are further reverse drawn and re-formed inward to form an outer circumferential side folded bulge part that protrudes outward between the poly V groove molded part and the inclined step part. and a step of forming a preformed material in which the inclined stepped portion between the folded bulges on the inner and outer circumferential sides becomes a support wall portion that is gently curved inward in a concave shape, and the poly V groove molded portion is It is bent outward by the amount corresponding to the thickening to form a bulging portion, and the same thickening bulging portion is compressed to thicken the poly V groove molded thick portion to correspond to the degree of bending. a thickening forming step, a poly V groove forming step of appropriately forming a poly V groove in the poly V groove molded thick portion, and cutting and removing the central portion of the inverted substrate portion to form a bearing fitting portion. a step of forming a bearing portion; supporting the bearing support portion from the outer peripheral side; and press-fitting a ready-made bearing inside the bearing fitting portion;

This is a method for manufacturing a poly V pulley made of a sheet metal having a bearing, characterized in that it includes at least sequentially a bearing press-fitting process in which the bearing is crimped and fitted, and a crimping process.

[For production]

Therefore, in the method of this invention, a cup-shaped material consisting of a substrate part and a peripheral wall part is used, a poly V groove is formed on the peripheral wall part,
In addition, in the manufacturing method of a sheet metal poly V pulley in which a ready-made bearing is press-fitted and caulked into the bearing fitting part of the shaft core part, the ready-made A folded bulge is provided between the bearing fitting part into which the bearing is fitted and the support wall, and the support wall is connected to each folded bulge and gently curved inward to form a concave shape. Because of this, each folded bulge and support wall constitute a kind of buffer, and absorb the internal stress that acts on the peripheral wall and the bearing fitting part during molding, that is, molding stress. Residual stress and the like can be effectively absorbed and buffered, and as a result, a sheet metal poly-V pulley having this type of bearing can be obtained with high precision.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for manufacturing a sheet metal poly V pulley having a bearing according to the present invention will be described in detail below with reference to FIGS. 1 and 2.

1(a) or 1(a) show a sheet metal poly V pulley according to this embodiment, in which a plurality of sheet metal poly V grooves arranged at a predetermined pitch are formed on the peripheral wall, and its manufacture. FIG. 3 is a half-cut cross-sectional view showing processing modes at each main stage of the method from sheet metal material to product.

That is, first, in FIG. 1, in the case of this embodiment method, a sheet metal material of a predetermined thickness is deep drawn to form a substrate portion 2I,
A step of forming a cup-shaped material U consisting of a rough layer wall portion 22 having a flange 23 on the side of the opening edge 22a (FIG. 2(a)); An inclined stepped portion 31 is formed on the wall portion 22, and the Dowa peripheral wall portion 22 is divided into a poly V groove molded portion 24 on the opening edge 22a side and a preformed portion 25 on the base plate portion 21 side to form a stepped cup shape. Step formation process to obtain material ■ (see figure (
b)) and the preformed portion 25 of the stepped cup-shaped material H. Then, the substrate portion 21 side is reverse drawn to temporarily form an inner circumferential folded bulge portion 41 projecting outward, and the preformed portion 25 is formed into a bearing support portion 42. Invert the board part 21 to the board part 43
As shown in FIG. 2, a rough preformed material forming step (FIG. 2(C)) to obtain a rough preformed material 13a is performed, and the bearing support portion 429 of the rough preformed material 13a is further reverse drawn and reshaped inward. , between the V-groove molded part 24 and the inclined step part 31, an outer circumferential folded bulge part 44 which similarly protrudes outward is formed, and an inclined stepped part between these folded bulged parts 41 and 42. 31 as a supporting wall portion 45 that is gently curved inward in a concave shape to obtain a preformed material U (see (d) in the same figure), and the flange portion 23 of the preformed material U is cut into a circle and removed. After that, the poly V-groove molded part 24 was bent toward the outer periphery by an amount corresponding to the increased thickness, with the end portion 24a remaining on the outer circumferential side folded bulging part 44 side. Thickened wall 1 bulging part 5
1, a thickening preforming step ((e) in the same figure) to obtain a coarsely thickened molded material +4a.

The thickened bulging portion 51 of the coarsely thickened molded material 14a is formed into the groove-formed thickened portion 52, and at the same time, the end portion 24a is
A reference groove part 62 for poly V groove molding is placed in a part close to the
and a thickening forming step (1'; 1l(f)) of forming a thickening forming material U.

With respect to the poly V groove molded thick part 52 of the thickened molding material opening, with the reference groove part 62 as a molding reference point, on both sides of the outer circumferential folded bulge part 44 side and the opening edge 22a side, A poly V-groove forming step (FIG. 3(g)) to obtain a coarse poly V-groove material 15a in which a plurality of poly V-grooves 61 are formed, each having rising ears 83 and 64, arranged in parallel with each other and recessed. ) and the bearing support portion 42 of the rough poly V-grooved material 15a described in +iiij.
and reshaping the support wall portion 45, and (cutting and removing the central portion of the plate portion 43, leaving the bearing rod portion 71 at the inner peripheral side connection portion with the bearing support portion 42, A bearing fitting part 81 is formed in the same part to obtain a poly V-grooved material dust (see figure (h)), and a bearing fitting part 81 of the poly V-grooved material described in 1ii7 is formed. The ready-made bearing 91 is inserted into the bearing support portion 42 until it comes into contact with the bearing rod portion 71.
The bearing press-fitting and crimping process ((I) in the same figure) are carried out in sequence, and the sheet metal material is processed and formed through these processes to achieve the desired location. of.

A poly V pulley 100 made of sheet metal is manufactured, which has a poly V groove 61 on the outer periphery and a bearing 91 fitted into the shaft core of the bracket.

In addition, FIG. 2 (al) or il) shows the sheet metal poly V
It is sectional explanatory drawing which shows the more specific manufacturing process of the same manufacturing method of the pulley 100 one by one, and the detail in each process will be described next.

(1) Cup-shaped material forming step (FIG. 1(d)) In this cup-shaped material forming step, as shown in FIG. 2(al),
Using a sheet metal material with a predetermined thickness and outer diameter as a forming material, deep drawing is performed to a predetermined outer diameter and drawing depth using movable and fixed inner and outer drawing dies 111, 112 and a holding die 113. In this way, a cup-shaped raw material shell consisting of the substrate portion 21 and the coarse layer wall portion 22 is formed. At this time, a flange portion 23 made of surplus material resulting from the drawing process remains at the opening edge 22a of the coarse layer wall portion 22.

(2) Step forming step (FIG. 1(b)) In this step forming step, as shown in FIG. 2(bl),
With the cup-shaped material U fitted and held in the mutually superimposed inner pressing molds 211 and 212, the coarse layer wall portion of the cup-shaped material U on the substrate portion 21 side is pressed by the pre-stage pushing roller 213. 22 is pre-rolled, and an inclined stepped portion 31 is formed in the same part.
is formed to obtain a stepped cup-shaped material.

That is, in this step, the result is a cup shape;
By forming the inclined step portion 31 on the coarse layer wall portion 22 of the material U,
This coarse layer wall portion 22 is formed into a poly V groove molded portion 24 on the side of the opening edge 22a made larger in diameter by the inclined step portion 21, and a pre-4IO molded portion 25 on the side of the substrate portion 21 made smaller in diameter than this. be divided into

(3) Rough preformed material forming step (Fig. 1 (C)) In this rough preformed material forming step, as shown in Fig. 2 (cl), , While the stepped cup-shaped material is fitted and held, the inner drawing die 313 is used to temporarily reverse draw the stepped cup-shaped material to the inner diameter and drawing depth, and fold it inward to form the inclined cup. Between the step part 31 and the preformed part 25, an inner circumferential folded part 111 protruding outward is formed, and the preformed part 25 forms a bearing support part 42, and the base part 21 forms a reverse base part 43. be formed respectively.

Therefore, in this step, as a result, the inclined step portion 31
and the preformed portion 25 are formed into an acute angle shape in an inverted state. During reverse drawing forming over such a large angle range, strong internal stress is generated in the material, but in this case, the inner circumferential fold 1 bulge that protrudes outward at this acute-angled bent part 41, the generated internal stress is absorbed by the folded bulge, which is bent at an acute angle, and which is the easiest way to release this internal stress, and which forms a kind of buffer. It can be concentrated on the protruding portion 41, which allows the molding to be performed with higher accuracy and ease.

In this preforming material forming step, as shown in FIG.
With the step cup-shaped material (2) which has been subjected to reverse drawing forming being fitted and held, it is further drawn down by the inner drawing die 313, and this time, the poly V-groove forming part 2 is drawn.
4 and the inclined stepped portion 31, an outer circumferential folded bulge 44 protruding outward similar to the above is formed, and the inclined stepped portion 31 between the both folded bulged portions 41 and 42 allows the inner A preformed material U is obtained by forming a preliminary support wall portion 45 that is gently curved into a concave shape.

In this process, the folded bulge 41 on the inner circumferential side, which has been narrowed down to an acute angle in the previous step, is pushed open again, and together with the folded bulge 44 on the outer circumferential side, the inclined stepped portion 31 A supporting wall portion 45 that is gently curved inwardly into a concave shape.
As a result, the internal residual stress concentrated on the folded bulge portion 41 on the inner circumferential side is transferred to these support wall portions 45.
The particles are dispersed and released in the folded bulge 44 in an appropriate manner, and each part of the molding becomes more familiar with the molding, so that there is no risk of hindering high-precision molding.

(5) Thickening preforming step (Fig. 1(e)) In this thickening preforming step, first, as shown in Fig. 2(el),
With the preformed material garment held by the outer presser die 411 and the eccentric inner presser die 412, the shearing roller 4
13, the polyViJ molded part 24 is sheared from a predetermined dimensional position to remove and shape the flange part 23 and the surplus material portion in advance, as shown in FIG. 2 (e2). Inner and outer press molds 414 and 415, 41
With the end portion 24a tightly held between the inner and outer holding molds 415 and 418, the poly V groove molded portion 24 is formed by the outer drawing mold 417. A thickened bulging portion 51 is formed by bending the material toward the outer circumference by an amount corresponding to the thickening described later, and in this way, a rough thickened molded material 14a is obtained.

(8) Thickening forming step (FIG. 1(f)) In this thickening forming step, first, as shown in FIG. At the same time, a preliminary support wall fi45. of the same material 14a is fitted. Inner circumference side folding 1 bulge part 41. Bearing support part 42 and inversion board part 43
are concentrically clamped and held from the outside by an external holding mold 512, and the opening edge of the thickened first bulging portion 51.

That is, the opening edge 22a described above is brought into contact with and supported by the stepped portion 511a of the preforming die 511.

And this 7g poly V which also serves as a thickening roller.
The groove preform IaT& type roller 513 presses the bulging tip of the thickened bulging portion 51, but in this case, the opening edge 12a of the thickened bulging portion 51 is pressed against the abutment step portion 511a. Since the roller surface 513a of the roller 513 is supported by abutment, the thickened bulging portion 51 is gradually rolled and pressed and plastic flow formed, and the thickened portion 51 is thickened to a predetermined thickness at the turning portion. is achieved, and at the same time, the protruding forming surface 513b of the roller 513 causes the thickened bulge 51. Furthermore, the 44-digit end portion 24a near the outer circumferential folded bulge portion 44 of the thickened poly V-groove molded thick portion 52 is pre-rolled so as to be narrowed from the outer circumference, and poly A reference groove portion 62 serving as a forming reference point for groove forming is formed in advance, and a thickening forming step is thus obtained.

In this case, rolling molding is performed to increase the thickness of the poly V-groove molded thick wall portion 52, and at the same time, the base plate is formed at the same time. Fi
In the rolling process of the groove 62, internal stress is effectively absorbed due to the presence of the outer circumferential folded bulge 44, and there is no risk that the same stress will affect other molded parts.

(6) Poly V groove forming step (FIG. 1 (g)) In this poly V groove forming step, first, as shown in FIGS. 2 (gl) and (g2), 513 combinations, this is the eccentric first . Second
Poly V groove pre-forming mold 515, 517 and molding roller 5
113 and 518, and with the same clamping pressure maintained as above, the reference groove 62 is utilized as one molding reference point for poly-groove molding. For the poly V groove molded thick part 52, the first. As the second preliminary rolling, a plurality of parallel preliminary poly V grooves 81a, 61b are gradually narrowed down so as to gradually approach a predetermined size and shape, and the outer peripheral side folded bulge portion 44 (Rising ears 83 and 84 are formed on the opening edge 11 and the opening edge B12a side, respectively, so as to gradually rise.

That is, as you can see, for the thickened poly V Ft molded thick part 52, the reference groove part 62 becomes the molding reference point for poly V groove molding here, and the outer periphery as described above. Due to the presence of the side folded bulges 44, internal stress is effectively absorbed, and these first. A plurality of preliminary poly V-grooves 81a and Blb as the second preliminary rolling can be formed in parallel with sufficient wall thickness without excess or deficiency, and with ease and accurate size and shape arrangement.

Then, as shown in FIG. 2 (g3), the combination of the poly V-groove mold and the molding roller is moved to the eccentric ball IJ.
V-groove finishing mold 519. and the poly V-groove finishing forming roller 520, and with the same clamping pressure as described above being maintained in the second preliminary rolling, the plurality of parallel preliminary poly V-grooves 81b in the second preliminary rolling, ■The groove finish forming roller 520 performs finish rolling by narrowing deeper from the outer periphery, and multiple strips of poly vl+W 81 arranged in parallel can be formed with high precision on the same poly groove molded meat J part 52. In this way, a coarse poly V-grooved material 15a is obtained.

And here too, preliminary rolling of this poly V groove 61.

In addition, when finishing rolling, the outer peripheral side folded bulge 4
4. The supporting wall part 45 connected to the turning part and formed into a gently curved inner concave shape effectively absorbs the subtle effects of internal stress, and exerts the influence of molding stress and residual stress on other molded parts. Fear is thwarted.

(7) Bearing part forming step (FIG. 1(h)) In this bearing part forming step, first, as shown in FIG. While firmly clamped by the outer holding mold 613 in the same manner as described above, the bearing support part 42. and the support wall gBa5 of the same phase poly-grooved material a are once formed by the shaping roll 614.
Reshape and size.

Correct the accuracy.

In this case as well, the inner circumference side folded bulge portion 41. The internal stress applied during shaping is well absorbed by the support wall portion 45 which is gently curved in the shape of an inner cape.

Next, as shown in FIG. 2 (h2), the inverted base plate portion 4 is connected to the bearing support portion 42 of the rough poly V-grooved material 15a.
3. The bearing receiving part 7e corresponding to the peripheral part of No. 3 is pressed with another internal holding mold 61.
5 and the external presser mold 61G,
The center portion of the reversible substrate portion 43 is sheared off using a shear die 617, leaving only the coaxial receiving portion 71, and these bearing support portions 42. and a part including the bearing holding part 71,
A bearing fitting portion 81 is formed to obtain a length of material with a poly V groove.

(8) Bearing press-fitting and caulking process (Fig. 1 (i)) In this bearing press-fitting and caulking process, first, as shown in Fig. 2 (11), the supporting wall portion 45 of the length of the poly V grooved material is is firmly held between the inner presser die 711 and the outer presser die 712 in the same manner as described above, and the outer peripheral surface base of the bearing support portion 42 is held at the protruding end of the Kawachi presser die 711. 11a, and the bearing holding portions 71 of the bearing support portion 42 are each pressed and held by the internal holding mold 713, and in this state, using the pressing mold 714, the bearing support portion 42 constituting the bearing fitting portion 81 is pressed and held. Ready-made bearings inside! The I11 is press-fitted until it contacts the bearing holding part 71, and then caulked and fitted.

In this bearing press-fitting and caulking process, the outer peripheral surface base of the bearing support part 42 itself is held down by the protruding end 711a of the inner holding die 711, and the bearing holding part 71 is held by the inner holding die 713. Since it is a hollow, press-fitting and caulking of the ready-made bearing 81 are extremely smooth and easy, and furthermore, since the folded bulge 41 on the inner peripheral side is provided between the support wall 45 and the compressed support wall 45. Even here,
The internal stress generated during press-fitting and caulking can be effectively absorbed, and there is no risk of the same stress affecting other molded parts. .

That is, as described above, the poly V groove 81 is provided on the outer periphery, which is the object of this embodiment.

A pulley 10 made of sheet metal with a bearing 91 fitted in the shaft core.
0 can be constructed with high viscosity.

〔Effect of the invention〕

As described in detail above, according to the method of the present invention, a cup-shaped material consisting of a base plate part and a peripheral wall part is used, a poly V groove is formed on the peripheral wall part, and a bearing of the shaft core part formed with the base part is fitted. A ready-made bearing is press-fitted into the fitting part.

In the manufacturing method of a sheet metal poly V pulley configured by caulking, a deep drawn cup-shaped material is reverse drawn to form a peripheral wall portion forming a poly V groove, and a bearing fitting portion into which a ready-made bearing is fitted. When molding, the supporting wall connecting these two parts is provided with folded bulges on the inner and outer circumferential sides, respectively, and the supporting wall is formed to be gently curved inward into a concave shape. Therefore, each folded shadow part and the support wall part act as a kind of buffer part, and it is difficult to increase the thickness of the peripheral wall part, plastic molding of the poly VBM, and press-fitting of the ready-made bearing. : , i, the internal stress acting on the peripheral wall and the bearing fitting part, such as forming stress and residual stress, can be effectively absorbed, especially the stress absorption at the reverse drawing re-forming point. The effect is well exhibited, which not only makes the molding process itself easier, but also improves the dimensional accuracy of each molded part, especially poly V.
This can greatly improve the rotation center accuracy of grooves and ready-made bearings, that is, the axis accuracy, and sheet metal poly V with this type of bearing.
It has the advantage that pulleys can be mass-produced with high accuracy.

[Brief explanation of drawings]

The attached drawings show an embodiment of the method for manufacturing a sheet metal V-pulley with a bearing according to the present invention, and FIG. Half-cut cross-sectional views shown in sequence: Figure 52 (al)
11) to 11) are explanatory half-cut cross-sectional views showing more specific manufacturing steps of the same manufacturing method. ■...Cup-shaped material, ■...Stepped cup-shaped material, Clothes...Pre-4IR molding material, Civil d...Rough pre-forming material, Mouth...Thickening molding Material, +4a...
Rough thickened molded material, long...Poly ■Grooved material, long a
...Coarse poly V-groove material, 100... Sheet metal V pulley with a poly V-groove as a product and into which a bearing is fitted. 21... Substrate part, 22... Rough peripheral wall part, 24...
... Poly V groove molding part, 25... Preforming part. 31... Inclined stepped section. 41.44...Inner circumference side, outer circumference side folded bulge, 4
2...Bearing support part, 43...Reversal board part, 45
...Supporting wall section. 51... Thickened 1 shadow part, 52... Poly V groove molded thick part. 61...Poly V groove, 62...Reference groove part. 71...Bearing holding part. 81...Bearing fitting part. 91...Ready-made bearing. Ill...Inner drawing type, 112...Outer drawing type, 1
13... Internal press type. 211.212...Inner pressing type, 213...Preliminary stage pushing roller. 311.312...Inner pressing type, 313...Inner drawing type. 411.415,416...External press type, 412,4
14... Internal presser type, 413... Shearing roller, 4
17...Outer drawing mold. 511.515,517...preforming mold, 512.
...External press mold, 513,518,518...Preforming roller, 519...811.11i12,61
5...inner press type, 813,816...external press type, 6!7...shear type. 711.713...Inner press type, 712...External press type. 714...Push type. Patent applicant: Kanemityo Co., Ltd. Patent attorney: Takashi Suzue Procedural amendment December 27, 1985 Commissioner of the Japan Patent Office Tuition fees: Mr. Dobe Dobe ・Name of 11 designated patent applications No. 1988-265829 2, issue 1 Manufacturing method of sheet metal poly V pulley with bearing 3, Supplement i
Relationship between the person conducting lE and the matter: Patent applicant Kanemit Co., Ltd. 4, Agent address: Tatsumi Umeda Building 6, 8-1 Kamiyama-cho, Kita-ku, Osaka.
Target of correction +i rr+r 7. Details of correction As shown in the attached sheet (1) In the drawings, Figure 1 (C) and Figure 2 (C1) are replaced with those in the attached sheet. that's all

Claims (1)

[Scope of Claims] A cup-shaped material forming step of deep drawing a sheet metal material to form a cup-shaped material consisting of a substrate portion and a rough peripheral wall portion; a step forming step of dividing the peripheral wall portion into a poly V groove molded portion on the opening edge side and a preformed portion on the substrate side; and a step of forming the preformed portion and the substrate portion by reverse drawing and folding them inward.
forming a rough preformed material forming step of forming an inner peripheral side folded bulge portion protruding outward between each of these parts, and forming a bearing support part by the preforming part and a reversible base part by the base part, respectively; The support part and the reverse base plate part are further inwardly reverse drawn and re-molded to form an outer circumferential side folded bulge part protruding outward between the poly V groove molded part and the inclined step part, and an inner circumferential side, A step of forming a preformed material in which the inclined stepped portion between both folded bulging portions on the outer circumferential side becomes a support wall portion gently curved inward in a concave shape, and the poly V groove molded portion is bent outward by an amount corresponding to the thickening. a thickening forming step of bending to form a thickening bulge, and compressing the bulge to thicken the poly V-groove molded thick portion in accordance with the degree of bending; a poly V-groove forming step in which a poly V-groove is appropriately formed in the V-groove molded thick part; a bearing part forming step in which a bearing fitting part is formed by cutting and removing the central part of the inverted substrate part; A bearing characterized in that it includes at least sequentially a bearing press-fitting and crimping process of supporting a bearing support part from the outer peripheral side and press-fitting and crimping a ready-made bearing into the inside of the bearing fitting part. A method of manufacturing a sheet metal V-pulley having the following method.