JP2850758B2 - Pulley manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a pulley or the like in which a guide groove for a V-belt or the like is provided in an annular shape.

[0002]

2. Description of the Related Art In this type of pulley, two pulley pieces punched out from a metal plate such as a steel plate by pressing are back-adhered and fixedly formed by caulking or the like. Since the two pulley pieces are configured to fit back to back,
One of the pulley pieces was provided with a turning-over device that was punched out, received by an employee, and turned over the pulley piece.

[0003]

The prior art requires a hiring tool for receiving the punched pulley pieces and a reversing device, and the reversing device has a complicated mechanism. The present invention provides a pulley piece that can be easily turned over.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a method of manufacturing a pulley in which two pulley pieces punched from a plate-like metal material are joined back to back to form a pulley. Pressing the cutout leaving a connection part that connects the pulley piece to the metal material
The two connecting portions are arranged so as to face each other with a distance, and one pulley piece is rotated so that the two connecting portions are turned around, and then the connecting portion is cut to separate the pulley piece from the metal material. The pulley is separated from the separated pulley piece and the other pulley piece which is not turned upside down to form a pulley.

[0005]

[Function] The pulley piece is cut out and pressed, leaving two connecting parts to keep the pulley piece connected to the metal material. The other pulley pieces that do not fit are back to back to form a pulley.

[0006]

An embodiment of the present invention will be described below with reference to the drawings.

First, the structure of the pulley 11 will be described with reference to FIGS.
A description will be given based on FIG. The pulley 11 is formed by caulking two pulley pieces 1 and 2 back to back. Pulley 11
An annular receiving guide groove 3 is provided on the outer periphery of the. A V-belt is hung on the guide groove 3. The pulley pieces 1 and 2 formed by pressing a steel plate material are joined by a caulking portion.

The caulking section will be described. Caulking part 4
Are provided on both sides of the pulley 11. The receiving holes 6 and the protruding cylindrical portions 5 are alternately formed in the pulley pieces 1 and 2. A total of six receiving holes 6 and a projecting cylindrical portion 5 are formed in each pulley piece. Then, the pulley pieces 1 and 2 are back-to-back so that the projection 5 of the other pulley piece fits into the receiving hole 6 of one pulley. A crimping portion is formed by bending the distal end side of the protruding cylindrical portion 5 protruding from the receiving hole 6 so as to push and expand outward, and bringing the distal end side into contact with the side surface of the mating pulley piece.

In the center of the pulley 11, an insertion hole 29 'for the rotating shaft is provided.
Are formed.

FIG. 3 shows a procedure for combining the two pulley pieces 1 and 2 back to back. The pulley pieces 1 and 2 formed by pressing from a steel plate material are formed by the same press die and are the same. Of the pulley pieces, the pulley piece 2 is turned by 180 ° and turned so that the back-to-back surface is on the upper side. The pulley piece 1 is placed on the pulley piece 2 and the pulley pieces 1 and 2 are combined back to back. By this combination, the projecting cylindrical portion 5 of the other pulley piece fits into the receiving hole 6 of one pulley piece.

FIGS. 4 and 5 show the steps of forming the pulley pieces 1 and 2 by pressing from a steel plate material and combining the pulley pieces 1 and 2 back to back. FIG.
FIG. 5 is a plan view showing the process, and FIG. 5 is a side view.

The strip-shaped long steel sheet material 12 is fed from left to right. The pulley pieces 1 and 2 formed by pressing from the steel plate material 12 are formed by the same press die as described above, and are the same. Pulley pieces 1 and 2 formed by pressing are connected to connecting portions 9 and 1 by a steel plate material 12.
It is marked with 0. The connecting portions 9 and 10 are arranged at the widthwise ends of the material 12. Since the pulley pieces 1 and 2 have the receiving guide groove 3, the receiving hole 6, the protruding cylindrical portion 5, the rotary shaft insertion hole 29 ', and the like, they are formed through a plurality of pressing steps.

The pulley pieces 1 and 2 are cut off from the steel plate material 12 except for the connecting portions 9 and 10. The feed rail 7 that is not used for forming the pulley pieces 1 and 2 is finally discarded as an unnecessary portion. However, until the pulley 11 is completed by caulking the pulley pieces 1 and 2, It is necessary for the manufacturing process. The pilot hole 8 formed in the feed bar 7 is used as a guide hole for feeding the material 12 during the manufacturing process.

The pressed pulley piece has a back-to-back face down. The pulley piece 2 has its surface turned upside down. The pulley pieces 2 are arranged so as to be alternate. The pulley piece 2 is turned by an angle of 180 ° so as to turn over the connecting portions 9 and 10 as support shafts. The direction of the projecting tubular portion 5 of the inverted pulley piece 2 and the pulley piece 1 that is not inverted are reversed. The protruding cylindrical portion 5 of the pulley piece 2 faces upward, and the protruding cylindrical portion of the pulley piece 1 faces downward.

Pulley piece 2 that has been pre-processed and turned over
The connection parts 9 and 10 are cut off from the material 12.
The place where the pulley piece 2 does not come off is the hole 13 of the pulley piece. This through hole 13 can be placed next to one pulley piece 1.

The pulley piece 1 sent together with the material 12 is back-backed on the pulley piece 2 separated from the material 12, and the above-described swaging of the receiving hole 6 and the protruding cylindrical portion 5 is performed. Is performed to form the pulley 11. At this time, since the pulley piece 1 side of the pulley 11 is connected to the material 12 with the connecting portions 9 and 10, one pulley 11 can be obtained by cutting the connecting portions 9 and 10.

The pulley 11 is manufactured through the manufacturing process as described above. The inversion of the pulley piece 2 and the temporary assembly of the pulley pieces 1 and 2 will be described in more detail.

First, the inversion of the pulley piece 2 will be described with reference to FIG.

FIG. 6 shows a reversing device. This reversing device is a part of a pulley manufacturing line, and a pulley piece pressed here is sent while being attached to the material 12.

The outline of the reversing device will be described. The upper mounting base 14 has a reversing top piece 15 and a reversing molding top piece 16. The lower mount 17 has a lower top 18 for reversing and a lower top 19 for reversing. The cylinder 20 provided on the lower mounting base 17 is rotatably supported by a support portion 21. The cylinder 20 is provided with a push rod 22 which moves in and out. The upper mounting table 14 is provided so as to move up and down with respect to the lower mounting table 17. The reversing upper frame 15 is disposed to face the reversing lower frame 18, and the reversing upper frame 16 is disposed to face the reversing lower frame 19. Have been. When the upper mount 14 is lowered to the lower position,
Reference numeral 5 is for contacting the lower frame 18 for reversal, and the upper frame 16 for reversal molding is to contact the lower frame 19 for reversal molding. The upper mount 14 is configured to be moved up and down by a crank mechanism (not shown). At the top dead center of the crank mechanism, the upper mounting base 14 is located at the top, and at the bottom dead center of the crank mechanism, the upper mounting base 14 is located at the bottom. When the upper mounting base 14 comes to the lowermost position, the crank is set so that the contact between the reversing upper frame 15 and the reversing lower frame 18 and between the reversing upper frame 16 and the reversing lower frame 19 is sufficient and reliable. The mechanism is set to be in a contact state slightly before the bottom dead center of the mechanism. In order to alleviate the unreasonable force due to the contact and the operation of the crank mechanism, the reversing upper piece 15 and the reversing upper piece 16 are mounted on the upper mounting base 14 via a spring (not shown).

A relief hole 23 is formed in the lower mounting base 17 at a portion located on the inner lower surface of the reversing lower top 18, and a reversing rotation assisting part 24 slightly projecting toward the upper surface side of the lower mounting base 17 is provided. Is provided. This reverse rotation assisting part 2
Although not shown, the positional relationship between the upper frame 4 and the reversing upper frame 15 and the reversing lower frame 18 is not shown, but is as follows.

The reversing rotation assisting part 23 and the reversing upper frame 15
The (reverse inverting top piece 18) is displaced by 90 ° from the center of the pulley piece. Upper frame 1 for reversal
5 (reversing lower frame 18) is mounted on the upper mounting base 14 and the lower mounting base 17 so as to be located near the connection parts 9 and 10 of the material 12.
Are located in The reverse rotation assisting portion 24 is arranged at the center of the width direction of the material 12 at a position corresponding to the outer peripheral position of the pulley piece corresponding to the feed direction of the material 12. In the illustration of FIG. 6, the reversing upper frame 15 (reversing lower frame 18) and the reversing rotation assisting portion 24 appear to be aligned in a straight line in the feed direction of the material 12. Lower frame 1
8) is the position of the connection parts 9 and 10. For the purpose of drawing, they are represented as shown in the figure for convenience.

With the reversing device having such a configuration, the material 12
Is inverted as follows.

That is, the pulley piece formed by the press working is sent to the reversing device together with the raw material 12. At this time, since the upper mounting base 14 is placed on the uppermost part by the operation of the crank mechanism, the pulley piece can be put into the reversing device.

The material 12 is fed by a specified feed pitch by applying a pilot pin (not shown) to a pilot hole 8 formed in the feed bar 7 of the material 12, so that the pulley piece is positioned at a specified position of the reversing device. Will be placed in Thereafter, the crank mechanism is operated to lower the upper mounting base 14 to the lowermost position, so that the vicinity of the connection portions 9 and 10 of the material 12 is sandwiched between the reversing top piece 15 and the reversing bottom piece 18. The material 12 is caught and is held in a fixed position. Under these circumstances, the cylinder 20
When the push rod 22 is pushed out further, the pulley piece is connected to the connecting portions 9 and 1.
It is rotated around 0. The lower part of the inclined pulley piece, which has been turned approximately 110 °, will be somewhat into the clearance hole 23 of the lower mounting 17. Thereafter, when the push rod 22 is retracted and the upper mounting table 14 is raised to the uppermost position, the holding of the material 12 by the reversing upper frame 15 and the reversing lower frame 18 is released. Then, the pulley pieces are fed rightward at a specified feed pitch while being attached to the material 12. At this time, since the lower portion of the pulley piece comes into contact with the reversing rotation assisting portion 24, the pulley piece is further turned around the connecting portions 9 and 10. It is turned to about 140 °.

The pulley piece sent to the specified position of the reverse molding lower frame 19 while being tilted to the material 12 is moved downward by lowering the upper mounting table 14 to the reverse molding upper frame 16 and the reverse molding lower frame 19. It is sandwiched between tops 19. By this pinching, the pulley piece is turned from the inclined state to the horizontal state with the connecting portions 9 and 10 as fulcrums. In this manner, the pulley piece 2 with the mating surface for back-to-back facing up
Is made.

Next, temporary assembly of the pulley pieces 1 and 2 will be described with reference to FIGS. 7, 8, and 9 show a temporary assembling apparatus. This temporary assembling apparatus is a part of a pulley manufacturing line, and pulley pieces 1 and 2 that have been pressed are sent to the blank 12 while being attached thereto.

The outline of the temporary assembling apparatus will be described. The upper mounting table 14 and the lower mounting table 17 are provided with a temporary assembly unit and a connection cutting unit. This mounting table 14
Are mounted on a press mounting table 25.

The temporary assembly unit includes a temporary assembly lower frame 26 fixed to the lower mount 17, a temporary assembly punch holder 27 fixed to the upper mount 14, and a stripper 28.
Having. Center ring pin 2
9, a positioning pin 30 is provided, and the centering pin 29 and the positioning pin 30 protrude above the temporary lower assembly 26. The temporary assembling ejector 31 provided on the temporary assembling piece 26 is slidably provided in the temporary assembling piece 26 in the vertical direction. Ejector 31 for temporary assembly
A push-up spring 32 is arranged below the bottom. A push-up force is applied to the temporary assembling ejector 31 by the push-up spring 32, and the upper end of the temporary assembling ejector 31 is supported so as to be flush with the upper surface of the temporary assembling lower piece 26. The stripper 28 is supported so as to be suspended by the temporary assembling punch holder 27 with a stripper bolt 33. The stripper bolt 33 is vertically slidably supported by the temporary assembling punch holder 27 and has a push-down spring 34 attached thereto. Further, the stripper 28 is provided with the centering pin 29,
Three holes (a centering pin hole, a positioning pin hole, and a temporary assembling punch hole) are formed by inserting a positioning pin 30 and a later-described temporary assembling punch.

The temporary assembling punch 35 is provided on the temporary assembling punch holder 27 and the upper mounting base 14 so as to be vertically slidable. The temporary assembling punch 35 is disposed such that its lower end faces the upper end of the temporary assembling ejector 31 and has the temporary assembling ejector 31 in a state where the stripper 28 is aligned with the temporary assembling lower frame 26. It is configured such that it can be slightly inserted into the hole on the side of the lower frame 26.

A cam guide 36 is mounted between the press mounting table 25 and the upper mounting table 14. The temporary assembling punch cam 37 provided between the cam guide 36 and the upper mounting base 14 is attached so as to be slidable in the lateral direction. The upper end of the temporary assembling punch 35 protruding from the upper surface of the upper mounting base 14 is arranged so as to face the cam surface of the temporary assembling punch cam 37.

Next, the connection disconnecting unit will be described.
The connection disconnecting unit includes a connection disconnecting unit base 38, a connection disconnecting punch 39, and a pad 40. The connection cutting unit base 38 is mounted on the lower mounting base 17 so as to be slidable in the horizontal direction. The pad 40 is supported by a connection part cutting unit table 38 by a support bolt 41. The pad 40 is supported by the support bolt 41 so as to be slidable in the vertical direction, and is urged to be pushed upward by a push-up spring 42 attached to the support bolt 41. The connection cutting punch 39 whose upper end is fixed to the pad 40 is connected to the connection cutting unit base 3.
8 so as to be able to slide up and down. The feed rail receiver 43 provided on the connection part cutting unit table 38 is arranged at a position facing the lower end of the connection part cutting punch 39. The feed rail receiver 43 is mounted so as to be slidable up and down, and is urged to be pushed upward by a push-up spring 44 provided at a lower portion. The upper end of the feed rail receiver 43 is regulated so as not to protrude upward from a position flush with the upper surface of the feed rail support part of the connection part cutting unit table 38.
The pad 44 is not attached to the upper mounting base 14, and is pushed down against the push-up spring 42 when the upper mounting base 14 is lowered. When this is pushed down, a through hole 45 through which the support bolt 41 passes is formed in the mounting base 14. When the connecting portion cutting unit table 38 is slid in the lateral direction, the pad 40 moves together. A guide recess 46 is formed on the lower surface of the upper mount 14 so that the movement of the pad 40 is allowed. Although such a connection disconnecting unit is provided on both sides of the temporary assembly unit, it is omitted in the connection disconnecting unit on the right side in FIGS. 7, 8 and 9.

With the temporary assembling apparatus having such a configuration, the temporary assembling of the pulley is performed as follows.

That is, when the upper mount 14 and the press mount 25 are raised to the uppermost positions by the operation of the crank mechanism, the stripper 28 and the pad 40 are raised upward. The temporary assembling punch 35 and the connecting portion cutting punch 39 are also raised upward together. The inverted pulley piece 2 is fed to the place where the temporary assembling punch 35 and the connecting portion cutting punch 39 are raised. The pulley piece 2 is fed to a position shown by a two-dot chain line in FIG. Although not shown in FIG. 7, stripper 2
8. The temporary assembling punch 35 and the connecting portion cutting punch 39 are located above the pulley piece 2.

The upper mounting base 14 is operated by the operation of the crank mechanism.
When the press mount 25 descends, the pulley 2
The material 12 is pushed down by the stripper 28 and descends. At the time of the lowering, the centering pin 29 and the positioning pin 30 are inserted into the rotary shaft insertion holes 29 'and the positioning holes 30' of the pulley piece 2, and the positions with respect to the temporary assembling device are defined. Further, the stripper 28 descends, and the pulley piece 2 is pressed against the temporary lower assembly 26 from above by the stripper 28. At this time, as shown in FIG. 6, the vicinity of the connection portions 9 and 10 of the material 12 is
The connection parts 9 and 10 are cut by the connection part cutting punch 39 while receiving the above. The feed rail 7 near the connecting parts 9 and 10 is sandwiched between the feed rail receiver 43 and the connecting part cutting punch 39, and the pulley piece 2 separated from the material 12 is Put on top. Thereafter, the upper mount 14 and the press mount 25 are raised to the uppermost position by the operation of the crank mechanism. Stripper 28
Then, the pad 40 is raised upward, and the temporary assembling punch 35 and the connecting portion cutting punch 39 are also raised upward. Only the separated pulley 2 remains on the temporary assembly lower piece 26 with the back-to-back surface facing up, and the material 12 rises upward and returns. At this point, the pulley piece 1 that has not been inverted is fed together with the material 12. The pulley piece 1 is fed to a position shown by a two-dot chain line in FIG. Although not shown in FIG. 8, the stripper 28, the temporary assembling punch 36, and the connecting portion cutting punch 39 are located above the pulley piece 1. Here, the connecting portion cutting unit table 38 is moved to the left so that the connecting portion cutting punch 39 moves away from the pulley piece 1. Then, when the upper mounting table 14 and the press mounting table 25 are lowered, the pulley piece 1 and the material 12 are pushed down by the stripper 28 and lowered. At the time of the lowering, the centering pin 28 and the positioning pin 30 are inserted into the rotary shaft insertion holes 29 'and the positioning holes 30' of the pulley piece 1 in the same manner as described above, and the position with respect to the temporary assembly device is defined. You. When the stripper 28 further descends, the pulley piece 1 with its back face down is fitted from above onto the pulley piece 2 placed with its back-to-back face on the temporary assembly lower piece 26 facing up. The stripper 28 is pressed from above. As described above, the pulley piece 2 and the pulley piece 1 are back-to-back, and when the cam 37 for the temporary assembly punch is slid to the right, the upper end of the punch 35 for the temporary assembly is pushed by the cam surface, and the punch 35 for the temporary assembly is Descend. This temporary assembly punch 3
As shown in FIG. 8, the lower end of 5 presses the overlapping portion of both pulleys from the pulley piece 1 side to the pulley piece 2 side to form a punch raised portion 47 that protrudes from the pulley piece 1 side to the pulley piece 2 side. The punch raised portion 47 connects the pulley piece 1 and the pulley piece 2 to complete a temporarily assembled pulley.

Thereafter, the upper mounting table 14 and the press mounting table 25 are raised upward by the operation of the crank mechanism, so that the stripper 28 and the temporary assembling punch 35 stand on the upper side, and as shown in FIG. The assembled pulley is in a state where the material 12 is detached from the temporary lower assembly 26. After that, it is sent to the next process,
The pulley piece 1 and the pulley piece 2 described in FIG. 2 are caulked, and the pulley 11 separated from the material 12 is completed.

[0037]

As described above, the present invention relates to a method of manufacturing a pulley, in which a pulley piece punched from a plate-like metal material is joined back to back to form a pulley.
At the two locations located on the outer periphery of the pulley piece, a cut-out press processing is performed, leaving a connection part for connecting the pulley piece to the metal material, and these two connection parts are arranged so as to face each other, and one of the pulley pieces After turning the two connecting parts as a fulcrum and turning them upside down, cut the connecting part to separate the pulley piece from the metal material, and align this separated pulley piece with the other pulley piece that is not turned upside down Forming a pulley.

According to this configuration, one of the pulley pieces is rotated so that the two pull-up points are used as fulcrums, and then the connection portion is cut to separate the pulley piece from the metal material. Since the other pulley pieces that have not been turned upside down are formed back to back to form a pulley, there is no need to use a hiring tool after punching out the pulley pieces and to use a complicated turning device that turns over the pulley pieces.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pulley according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing a caulked portion of a pulley.

FIG. 3 is a diagram showing a procedure for combining two pulley pieces back to back.

FIG. 4 is a plan view showing a pressing step.

FIG. 5 is a side view showing a pressing step.

FIG. 6 is a side view showing the reversing device.

FIG. 7 is an explanatory diagram of an operation of a temporary assembling apparatus for cutting a connecting portion.

FIG. 8 is an explanatory view of a temporary assembling punch operation of the temporary assembling apparatus.

FIG. 9 is a diagram showing the end of the temporary assembling punch operation of the temporary assembling apparatus.

[Explanation of symbols]

1, 2, pulley piece, 9, 10, connection part, 11 ... pulley,
12 ... material.

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor ▲ Takao Hashi Masato 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Pref. Hitachi, Ltd. Living Equipment Division (58) Field surveyed (Int.Cl. ⁶ , DB name) B21D 53/26

Claims (1)

(57) [Claims] 1. A method of manufacturing a pulley in which two pulley pieces punched from a plate-shaped metal material are joined back to back to form a pulley, wherein the pulley pieces are connected to the metal material at two locations located on the outer periphery of the pulley pieces. Pressing of the cutout is performed leaving the connection part, these two connection parts are arranged so as to face apart and one pulley piece is rotated so that the two connection parts are fulcrums, and then the connection part is turned. A method of manufacturing a pulley, comprising cutting a pulley piece from a metal material by cutting, and forming a pulley by back-to-back joining the separated pulley piece with another pulley piece that is not turned upside down.