JP2001232425A - Method and apparatus for work punching - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for punching a work and its apparatus in which a plate material can securely be centered without affecting a transfer speed etc. of the plate material and a work can be efficiently punched in a high precision. SOLUTION: When a plate material 3 having corner parts 22, 23 to both sides is placed on a die 15 and a work 2 is by descending forming punches 19, 20, the plate material 3 is horizontally pressed to counter punches 16, 17 arranged with a pair of guides parts 28, 29 which face both corner parts 22, 23 of the plate material 3 and incline in the direction descending toward the center of the plate material 3 prior to punching of the 2 by the forming punches 19, 20, the corner parts 22, 23 of the plate material 3 is brought into sliding contact with the work guide inclined parts 28, 29, thereby centering the plate material 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for punching a workpiece.

[0002]

2. Description of the Related Art When a workpiece having a predetermined shape is punched and formed from a metal plate, a strip-shaped plate is continuously transported along a transport path and supplied to a punching apparatus. Generally, this kind of plate material is a coil wound to a predetermined length, and the plate material is pulled out from the coil and conveyed along the conveyance path.

In the above-mentioned processing apparatus, a workpiece is formed by punching a predetermined position of a supplied plate material. For this reason, in the transport path, it is necessary to transport the plate material while positioning the plate material such that the punching position of the work in the plate material passes through the processing position of the processing device. Regarding the positioning of the plate material at this time, in order to facilitate the alignment between the plate material and the processing position of the processing device, the centering is performed so that the center in the width direction of the transport path coincides with the center in the width direction of the plate material. It is preferred to do so.

Conventionally, when performing centering of the plate material, a pair of guide members (for example, a guide plate and a contact pin) are provided on both sides of the conveyance path to abut both ends in the width direction of the plate material to regulate the plate material. And the like, and the distance between the opposing guide members is made equal to the width of the plate material.

However, the width of the plate material may be different for each coil described above. In this case, when the width of the plate pulled out from the coil is smaller than the facing distance between the two guide members, the plate is displaced in the width direction, the centering accuracy is reduced, and the width of the plate is reduced by the width of the two guide members. When the distance is larger than the facing distance, the plate material cannot pass between the two guide members, and smooth conveyance cannot be expected. For this reason, the facing distance between the two guide members must be set and changed for each coil, and there is a disadvantage that work efficiency is poor.

Further, the accuracy of centering by a pair of guide members is determined by the clearance between each guide member and the plate material. However, if the clearance between each guide member and the plate material is reduced, the conveyance resistance increases. There is a risk that high-speed conveyance will be hindered.

As shown in FIG. 4, for example, thin portions 24, 2 are formed at both ends in the width direction via corners 22, 23.
There is known a plate member 3 provided with work forming portions 26 and 27 for forming a work in portions including both thin portions 24 and 25. In the plate 3 of this type, the center of the range a between the two corners 22 and 23 is set as the centering reference b described above.

However, in this type of plate 3, the width of one thin portion 24 may be different from the width of the other thin portion 25. And the center of the range a between the two corners 22 and 23 does not coincide with each other, so that there is a disadvantage that the centering with high accuracy cannot be performed by the above-described regulation by the guide member.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned inconvenience, the present invention centers the plate material without affecting the transport speed of the plate material and the like, thereby efficiently punching a high-precision work. An object of the present invention is to provide a method and an apparatus for punching a work that can be performed.

[0010]

In order to achieve the above object, according to the present invention, a plate material having corners on both sides is placed on a die, and a workpiece having a predetermined shape is punched from the plate material by descending a forming punch. A method and an apparatus for punching a work that can perform centering of a plate material when removing the work.

[0011] In the method of the present invention, a counter punch, which is provided so as to be capable of protruding and retracting in the die opposite to the forming punch, is opposed to both corners of the plate and descends toward the center of the plate. And a pair of guide inclined portions which are inclined at a right angle. Prior to the punching of the workpiece by the forming punch, the method includes a step of pressing the plate material horizontally, and bringing the corner of the plate material into sliding contact with the guide inclined portion to perform centering of the plate material.

An apparatus of the present invention for realizing the method of the present invention comprises a pad for pressing and holding a plate material having corners on both sides on a die, and a punching position provided on the die so as to be able to protrude and retract. A counter punch abutting on the lower side of the plate, and a forming punch for pressing down a punching position of the plate material on the counter punch and punching a work of a predetermined shape from the plate material. When the plate is pressed horizontally by the pad prior to punching, the plate is lowered toward the center of the plate in opposition to both corners of the plate so as to slide the corners of the plate and center the plate. And a pair of guide inclined portions that are inclined in the direction of movement.

According to the present invention, the counter punch is provided with the guide inclined portion for centering the plate material before punching the work, so that when the plate material is lowered toward the die by the pad, Prior to being pressed and held on the die, the plate material has its corners abutting the guide inclined portion of the counter punch. At this time,
When the center between both corners of the plate material is displaced to the left or right from the centering position, one corner abuts on the opposing guide slope. Since the plate is further lowered horizontally by the pad, the corners slide downward along the guide inclined portion, and the plate moves in the centering direction while keeping the horizontal posture. As a result, when the other corner comes into contact with the guide inclined portion opposed thereto, both corners are in a state of being sandwiched between the two guide inclined portions. At this time, since the plate is in a horizontal posture and its two corners are in contact with the same position of both the guide inclined portions, the center between both corners of the plate matches the centering position, and the plate is centered. Since the plate material thus centered is punched by the forming punch while maintaining its posture, it is possible to perform a highly accurate work punching process.

Further, since the centering of the plate material positioned on the counter punch can be performed prior to the punching by the forming punch, for example, the plate material is conveyed between the forming punch and the counter punch. In this case, it is possible to eliminate the need for highly accurate centering by a guide member or the like that guides the plate material by regulating both end sides of the plate material. As a result, the clearance between the guide member and the plate member can be relatively widened, so that the contact of the plate member with the guide member can be reduced and the transfer speed of the plate member can be increased, thereby improving the work production efficiency. Can be.

[0015]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory plan view showing a state of transport of a plate material in the present embodiment, FIG. 2 is an explanatory view showing a centering step in a main part of the present embodiment, and FIG. 4 is an explanatory view showing the cross-sectional shape of the plate material, FIG. 5 is an explanatory view showing a part of the structure of the belt for a continuously variable transmission, and FIG. 6 is an explanatory view showing the operation of the present embodiment on other plate materials.

As shown in FIG. 1, a punching apparatus 1 according to the present embodiment punches an element 2 as a work from a plate material 3. As shown in FIG. 5, the element 2 constitutes a continuously variable transmission belt 4 by laminating a plurality of annular members. As shown in FIG. 5 is provided with a body 7 continuously provided via a neck 6. As shown in FIG. 5, an endless ring 9 for maintaining a state in which a plurality of stacked elements 2 are bound in an annular shape is mounted in a recess 8 between the head 5 and the body 7 corresponding to the neck 6. You. In addition,
The endless ring 9 is formed by stacking a plurality of metal plate rings. An inclined surface 10 is formed on one side surface of the body 7 of the element 2 for smoothly guiding each laminated element 2 to bend in the circumferential direction.

First, the configuration of the punching apparatus 1 according to the present embodiment will be described. As shown in FIG. 1, the processing apparatus 1 includes a transport path 11 that transports the band-shaped metal plate material 3, and includes a first processing station 12 and a second processing station 13 along the transport path 11. I have. In the first processing station 12 and the second processing station 13, the plate material 3
And simultaneously a step of punching a pair of elements 2 is performed. Further, a plurality of guide members 14 for guiding the plate material 3 conveyed along the conveyance path 11 in the conveyance direction are provided.

The first processing station 12 and the second processing station 13 have the same configuration.
That is, as shown in FIG.
Counter punch 1 provided on die 15 so as to be freely retractable
6, 17 are provided. The counter punch 16,1
7 is urged upward by urging means (not shown). Further, above the plate material 3 via the transfer path 11,
A pad 18 which presses and holds the plate 3 on the die 15 by descending toward the die 15, and forming punches 19 and 20 for punching out the element 2 from the plate 3 opposed to the counter punches 16 and 17 are provided. I have. The forming punches 19 and 20 of the first working station 12 and the second working station 13 are integrally lifted and lowered by the same lifting / lowering means (not shown), and the pad 18 is moved by both the forming punches 1 and 2.
It moves up and down in conjunction with 9, 20.

The guide member 14 is urged upward by urging means (not shown), and follows the downward movement of the pad 18 by a guide member pressing portion 21 provided on the pad 18. As shown in FIG. 2A, the guide member 14 guides the plate 3 with a relatively large clearance. Thereby, the contact of the plate 3 with the guide member 14 is reduced, and high-speed conveyance of the plate 3 is realized.

Here, the shape of the plate 3 will be described.
As shown in FIG. 1, the plate member 3 is formed with a pair of elements 2 on the left and right sides, and as shown in FIG.
Thin portions 24, 24 at both ends in the width direction via corner portions 22, 23,
25 are provided. The thin portions 24 and 25 are formed to be inclined so as to gradually become thinner toward the edge of the plate 3. A pair of element forming parts 2 that form the element 2 on both sides including a part of both thin parts 24 and 25
6, 27 are provided. The thin portions 24 and 25 are portions where the inclined surface 10 of the body 7 shown in FIG. 5 is formed by being pressed at the time of punching. By providing the thin portions 24 and 25 in the plate member 3 in advance, the amount of press forming for press forming the inclined surface 10 of the body 7 can be reduced, and the forming accuracy of the element 2 is improved. Can be done.

Further, in the processing apparatus 1 of the present embodiment,
At the same time, a pair of elements 2 are simultaneously
In order to perform the blanking by aligning the thin portions 24 and 25 of the plate 3 with the position where the inclined surface 10 of the body 7 is formed, it is necessary to center the plate 3 with high precision. Therefore, the plate material 3
In, the center of the range a between the two corners 22 and 23 is set as the centering reference b.

As shown in FIG. 2 (a), the counter punches 16 and 17 have guide inclined portions 28 and 29 for centering the plate 3 prior to the punching of the element 2.
Is provided. The guide inclined portions 28 and 29 are provided on each of the counter punches 16 and 17 symmetrically.
As shown in FIG. 3, the thin portion 24 (25) of the plate member 3 also has a function of press-forming the contour of the inclined portion 10 of the body 7 of the element 2 shown by a virtual line. In FIG. 3, only the first processing station 12 side is shown in an enlarged manner, but the second processing station 13 side is also left-right symmetric. Shown in parentheses. The guide inclined portion 28 (2
The inclination angle c of 9) is formed smaller than the inclination angle d of the corner 22 (23) of the plate material 3. Thus, when the plate 3 is lowered toward the die 15 by the pad 18, first, the corners 22 (23) of the plate 3 come into contact with the guide inclined portions 28 (29).

The step of centering the plate 3 will be described in more detail. As shown in FIG.
The plate 3 conveyed along 1 is lowered toward the die 15 by the pad 18. And board material 3
Prior to being held on the die 15, its corners 22,
23 is a guide inclined portion 2 of the counter punches 16 and 17;
It touches 8,29. At this time, for example, as shown in FIG. 2B, when the center position b of the plate member 3 is out of the predetermined center position e, one corner 23 comes into contact with the guide inclined portion 29 opposed thereto. . The plate 3 is
Since the pad 18 is further lowered horizontally by the pad 18, the corner 2
3 slides along the guide inclined portion 29, and the plate 3 moves in the horizontal direction. As a result, as shown in FIG.
When the other corner portion 22 comes into contact with the guide inclined portion 28 facing the other corner portion, the sliding of the one corner portion 23 is restricted, and the two corner portions 2 are prevented from sliding.
2, 23 are located between the two guide ramps 28, 29. In this way, the center position b of the plate 3 coincides with the predetermined center position e, and the plate 3 is placed on both the counter punches 16 and 1.
7 is centered.

The plate 3 centered in this way
Is pressed and fixed on the die 15 by further lowering the pad 18 while maintaining the posture. Thereafter, although not shown, the forming punches 19 and 20 push the plate 3 downward below the die 15, and the element 2 is punched as shown in FIG.

In this embodiment, centering and punching of the element 2 have been described using the plate 3 having the shape shown in FIG. 4. For example, in the processing apparatus 1 of this embodiment, as shown in FIG. The centering and punching of the element 2 can be performed in the same manner even when a plate material 3 having a shape is used. The plate member 30 shown in FIG. 6 has thin portions 31 and 32 provided from both corners 33 and 34 via a step, regardless of inclination. Such a plate material 3
Even when the pad 18 is in the horizontal position, when the plate material 30 is lowered, the two corners 33 and 34 become the guide inclined portions 28 and 2.
9 can be slidably contacted, so that good centering can be performed.

Further, the processing apparatus 1 of the present embodiment is for punching the element 2. According to the present invention, although not shown, a plate material having the same shape as the plate materials 3 and 30 is used. It is needless to say that even when a work is punched, the centering can be performed well and a work with high accuracy can be punched. Further, the processing apparatus 1 shown in the present embodiment punches out a pair of elements 2 from a single plate 3 at the same time.
7 correspond to the left and right end portions of the plate material 3, respectively, so that each of the guide inclined portions 28, 29
7 shows an example. In the present invention, the present invention is not limited to this. For example, although not shown, in the case of a processing device for punching another work with a single counter punch, the guide inclined portions 28 are integrally formed on both sides of the counter punch. , 29 may be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view showing a transport state of a plate material in an apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a centering step in a main part of the present embodiment.

FIG. 3 is an enlarged explanatory view of a main part of the present embodiment.

FIG. 4 is an explanatory view showing a cross-sectional shape of a plate material.

FIG. 5 is an explanatory view showing a configuration of a part of a continuously variable transmission belt.

FIG. 6 is an explanatory view showing the operation of the present embodiment on another plate material.

[Explanation of symbols]

1 ... punching device, 2 ... element (work), 3 ...
Board material, 15 ... Die, 16,17 ... Counter punch, 1
8: Pad, 19, 20: Forming punch, 22, 23: Corner, 28, 19: Guide inclined part.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) // F16G 5/16 F16G 5/16 C

Claims (2)

[Claims] 1. A method for punching a work having a corner formed on both sides on a die, and punching a work of a predetermined shape from the plate by lowering the forming punch, wherein the work is opposed to the forming punch. A counter punch provided with a pair of guide inclined portions which are provided so as to be able to protrude and retract into the die, and are opposed to both corners of the plate material and descend toward the center of the plate material. A method of punching a workpiece, comprising a step of pressing the plate material horizontally prior to punching, and centering the plate material by sliding a corner of the plate material into contact with the guide inclined portion. 2. A pad for pressing and holding a plate having corner portions on both sides on a die, a counter punch provided to be able to protrude and retract from the die, and abutting below a punching position of the plate, and a counter punch. And a forming punch for punching a work of a predetermined shape from the plate by pushing down a punching position of the upper plate, wherein the counter punch is formed by the pad prior to punching the work by the forming punch. When the plate material is pressed horizontally, a pair of slants are inclined in the direction of descending toward the center of the plate material in opposition to both corners of the plate material so as to center the plate material by sliding the corners of the plate material. A work punching apparatus comprising a guide inclined portion.