JP4358551B2 - Mounting structure for punching dies and punching dies - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is arranged on the back side of a stripper that performs punching into various shapes of a product with a punching die, and then holds the product so that it does not lift with the punch when the upper die side including the punch is raised. For example, the knockout device can be applied to a progressive die that performs punching of an iron core of an electric motor.
[0002]
[Prior art]
For example, as shown in FIG. 1 and FIG. 2, the punching die to be implemented by the knockout device of the present invention performs the punching process on the shape of the product W using an upper die and a lower die. A punch 13 is mounted on the holder 11 via a packing plate 15 and a punch plate 14, and a die 32 is mounted on a die plate 31 provided on the lower mold holder 30 on the lower mold side.
[0003]
In the punching die, when the upper die holder 11 on the upper die side is lowered, the punch 13 mounted on the punch plate 14 is fitted into the die 32 on the lower die side, and the product W is compared with the punching material on the die plate 31. When the upper die side including the upper die holder 11 is raised thereafter, the punch 13 is pulled out from the die 32 and the product W.
[0004]
However, since the product W may be lifted together with the punch 13 due to the frictional resistance when the punch 13 is pulled out from the punching hole, the stripper 10 that holds the product W in order to prevent this, A knockout device for driving the stripper 10 is provided, and the product W is pulled away from the punch 13 on the lower surface of the stripper 10.
[0005]
The stripper 10 includes a stripper main body 10a and a stripper plate 10b formed integrally or separately, and is suspended from the upper mold holder 11 so as to be vertically movable. A knockout device is provided on the back surface (upper surface) of the stripper 10. The knockout plate 12 is mounted in accordance with this arrangement, and the knockout device 20 is mounted in the mounting holes 11 a and 11 b formed in the upper mold holder 11.
[0006]
The knockout device 20 is provided with a knockout plate 12 between the upper holder 11 and the stripper 10, and a plurality of knockout devices 20 are arranged at equal intervals on the entire surface of the stripper 10, and when punching the shape of the product W, The upper surface of the product W is pressed horizontally and evenly on the lower surface side of the stripper plate 10b, and the product W is pulled away from the punch 13 on the lower surface of the stripper 10 when the upper mold side rises.
[0007]
The knockout device 20 has been conventionally implemented as a unit as shown in FIG. 3, for example, and includes a flange 21a having substantially the same width as the knockout plate 12, a cylindrical shaft portion 21b following the flange 21a, and a flange. 21a and an axial hole 21c penetrating the axial center of the cylindrical shaft portion 21b form a lower body portion 21, and a flange 22a, a cylindrical shaft portion 22b having the same outer diameter as the cylindrical shaft portion 21b, and a flange 22a A main body upper portion 22 is formed by an axial hole 22c penetrating the axial center of the cylindrical shaft portion 22b.
[0008]
The main body lower portion 21 and the main body upper portion 22 have the cylindrical shaft portion 21b and the distal end side of the cylindrical shaft portion 22b attached to each other, and the connecting bolt 23 is inserted from the axial center hole 22c side with the distal end being a screw hole. The screw hole of the core hole 21c is screwed and integrated, and a spring member 24 and a spring receiving member 25 are mounted between the flange 21a and the flange 22a. A set screw 26 is screwed to prevent loosening.
[0009]
As shown in FIG. 1, the knockout device 20 is disposed in mounting holes 11a and 11b formed in large numbers at a predetermined interval on the lower surface side of the upper mold holder 11, and is interlocked with the stripper 10 via the knockout plate 12. After lowering and pressing the upper surface of the product W with the lower surface of the stripper plate 10b, when the upper die holder 11 is further lowered, the punch 13 punches the product W and further enters the punching hole 32a of the die 32 to the bottom dead center. At this time, the spring member 24 of the knockout device 20 is gradually compressed.
[0010]
The punch 13 starts to rise at the same time as the upper die starts to rise after being lowered to the bottom dead center. However, the stripper 10 that is pressed by the knockout device 20 via the knockout plate 12 has the spring member 24 of the knockout device 20 Since the rise is delayed by the amount of compression, the product W is held down by the stripper plate 10b during that time, and the product 13 can be prevented from being lifted, and a knockout function can be achieved in which the punch 13 can be easily pulled out of the product W.
[0011]
Therefore, when using the knockout device 20 as shown in FIG. 3 which has been unitized as in the prior art described above, the mounting holes 11a and 11b are provided in the upper mold holder 11, and the mounting holes 11a and 11b It can be easily used simply by installing the knockout device 20 and installing it between the knockout plate 12.
[0012]
[Problems to be solved by the invention]
However, since the upper mold side including the upper mold holder 11 always moves up and down during the punching process, the knockout device 20 mounted in the mounting holes 11a and 11b of the upper mold holder 11 has the mounting holes 11a and 11b. As a result, the bearing surface 11c with respect to the spring receiving member 25 formed by the stepped portion of the mounting hole 11a and the mounting hole 11b gradually wears. It's been found.
[0013]
In particular, not all of the large number of knockout devices 20 arranged on the entire surface of the stripper are worn evenly. It has been found that there is a possibility of impairing the punching accuracy of the product W by being applied to the product W as a load.
[0014]
Therefore, the present invention provides a knockout device for a punching die that can solve these problems of the prior art, and in particular, by a simple configuration in which an expansion / contraction pressing means is added to the knockout device according to the prior art. The main object is to prevent rattling of the knockout device in the mounting hole, reduce wear on the mold side due to rattling, and maintain a stable knockout function.
[0015]
[Means for Solving the Problems]
Punching die according to the present invention, the upper mold side having a punch with respect to the lower mold side having a die is moved up and down, a punching mold punching the product into a predetermined shape, the lower flange is a spring member A knockout device that is unitized so as to be clamped by a spring receiving member is mounted from below into a mounting hole formed in the upper mold holder, and is suspended and punched so as to be movable up and down with respect to the upper mold holder. products between the stripper and the knockout equipment to separate from the punches, characterized in that a telescopic pushing means for biasing the knock-out device upwards.
[0016]
The punching die, by the simple structure of adding the pressing means of the conventional knockout devices, it is possible to perform the knockout operation function similar to the knockout device according to the prior art knockout in the mounting hole of the upper die holder device By reducing the rattling and preventing the wear on the mounting hole due to the rattling, the pressing force applied to the stripper can be made uniform and stable.
[0017]
In other words, the knockout function becomes unstable due to wear caused by rattling of the knockout device, which was a problem of the prior art, or the product is punched due to the uneven load of multiple knockout devices provided on the knockout plate such as a progressive die This eliminates the loss of accuracy and contributes to the stabilization of the knockout function of the punching die and the improvement of the punching accuracy of the product.
[0018]
In addition, the knockout device mounting structure for the punching die according to the present invention comprises two cylindrical bodies and a spring member mounted on the outer periphery of a main body having an upper flange and a lower flange, and the spring member is a lower flange. Rutotomoni is interposed a spring receiving member is provided over the outer periphery of the body, by mounting the connecting screw in an axial hole formed in the body, by integrating two cylindrical bodies a knockout device is unitized, The knockout device is mounted to the mounting hole formed in the upper mold holder from below, and is suspended from the upper mold holder so as to be movable up and down so that at least the upper part is accommodated in the lower part of the axial hole . by compressed state the coil spring between the stripper and the knockout device, via a connecting screw, the spring bearing against the downward Bearing surface formed in the mounting hole of the member Characterized in that is pressed against Te.
[0019]
In the case of the mounting structure of the knockout device with respect to the punching die, a simple structure in which a coil spring is added as a biasing member that can be expanded and contracted with respect to the conventional knockout device can be mounted inexpensively and easily. In addition, it is possible to easily improve the performance by adding a coil spring to a knockout device in an existing punching die that is in operation.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a knockout device for a punching die according to the present invention will be described based on the knockout device 50 according to the embodiment of FIG. 4 to which the present invention is applied. The basic form of the knockout device 50 is the same as that of the knockout device 20 according to FIG. In addition, since the operation of knockout in the punching die is the same as in the case of FIGS. 1 and 2, the same reference numerals are given to the common parts and the detailed description is omitted.
[0021]
In the knockout device 50, as in the case of the knockout device 20 shown in FIG. 3, the lower body portion 21 and the upper body portion 22 are integrally connected by connecting bolts 23 attached to the shaft center holes 21c, 22c, and the cylindrical shaft portion 21b. , 22b, the spring member 24 mounted on the outer periphery thereof is locked at one end by a flange 21a, and the other end is locked by a spring receiving member 25 addressed to the flange 22a. A setscrew 26 for preventing loosening is screwed into the shaft hole 21c.
[0022]
The punching die is provided with mounting holes 11a and 11b by stepped holes in the upper mold holder 11 at positions aligned with the knockout plate 12 provided on the stripper 10, and a spring bearing member is formed on the bearing surface 11c formed in the stepped portion. The knockout device 50 is accommodated in such a manner that 25 abuts, and the knockout device 50 and the knockout plate 12 can be interlocked.
[0023]
The knockout device 50 is not configured to place the flange 21a directly on the knockout plate 12 as in the case of the knockout device 20 according to the prior art, but can be expanded and contracted between the lower end side of the knockout device 50 and the knockout plate 12. The pressing member 51 is interposed, and the spring receiving member 25 is urged upward by the pressing member 51 so as to come into pressure contact with the bearing surface 11c.
[0024]
The pressing member 51, in the embodiment of FIG. 4 uses a coil spring, a coil spring, set screw 26 for preventing loosening of the upper side of the lower end side is accommodated in the knockout plate abuts against the axial hole 21c to 12 It is brought into contact, by condensation set to urge the entire knockout device 50 upwardly through the set screw 26, to suppress the looseness of the knockout device 50 in the mounting hole 11a, the 11b, mounting hole side particularly Bearing surface The wear of 11c is prevented.
[0025]
Thereby, with a simple configuration added to the pressing member 51 in the conventional knockout device, a knockout operation that functions in the same manner as the knockout device 20 according to the prior art can be performed, and the knockout device 50 is mounted due to rattling. It is possible to prevent wear on the hole side, in particular the bearing surface 11c, and to make the pressing force applied to the stripper uniform and stable.
[0026]
Therefore, the knockout function becomes unstable due to wear of the knockout device 20 which is a problem of the prior art, or due to the uneven load of the plurality of knockout devices 50 provided on the knockout plate 12 such as a progressive die. This eliminates the loss of the punching accuracy of the product W, contributes to stabilizing the knockout function of the punching die and improving the punching accuracy of the product W.
[0027]
The present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the gist. For example, in the illustrated embodiment, the coil spring is inexpensive and easy to install as the pressing member 51. However, an elastic body such as a disc spring or a rubber material or a fluid pressure spring such as a cylinder can be used as long as it functions in the same manner.
[0028]
The pressing member 51 (a coil spring) in the illustrated embodiment, although reduced set between the lower surface of the top and set screw 26 of the stripper plate 12, the pressing member 51 of the upper surface of the flange 21a of the stripper plate 12 it is also possible to adopt a mode of reduced set between the lower surface, for example, the a hole gouge either the seat on one side, accommodating a disc spring as a pressing member 51 in a retracted within the groove aspect is protruded to the distal end side The form to do can also be taken.
[0029]
Moreover, in the knockout device 50 in the illustrated embodiment, the main body is constituted by the main body lower portion 21 and the main body upper portion 22, but the cylindrical shaft portion 21 b of the main body lower portion 21 is extended to omit the main body upper portion 22, and the cylindrical shape It is also possible to adopt a form in which the spring receiving member 25 is fitted to the outer periphery of the shaft portion 21b and locked by the connecting screw 23, and the coil spring which is the pressing means 51 is omitted by omitting the setscrew 26 for preventing looseness. It is also possible to adopt a form of engaging the tip of the connecting screw 23.
[0030]
Furthermore, in the illustrated punching die, the form in which the upper surface of the product W is directly pressed by the stripper plate 10b is exemplified. However, the product is configured to be wide so that the lower surface of the stripper plate 10b hits the upper surface of the product guide 33. When the upper die side including 13 is lifted by punching after punching W, even if the product W is lifted together with the punch, it is possible to take a form in which it is peeled off by the stripper plate 10b.
[0031]
That is, in the case of the above-described embodiment, the stripper 10 is more lifted than the upper mold side including the punch 13 for the time during which the compressed spring member 24 extends to the original shape with respect to the upper mold side including the punch 13. Therefore, even if the product W is lifted together with the punch 13, it is peeled off by the stripper plate 10 b in the middle, and the product W falls on the die plate 31.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a main part of a punching die to which a knockout device of the present invention is applied, when an upper die is raised.
FIG. 2 is a longitudinal sectional view of a main part at the time of lowering and punching of an upper die, which is a punching die to which the knockout device of the present invention is applied.
FIG. 3 is a longitudinal sectional view of a conventional knockout device that is also used in the present invention.
FIG. 4 is a longitudinal sectional view of a knockout device according to an embodiment to which the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Stripper 10a Stripper main body 10b Stripper plate 11 Upper mold | type holder 11a, 11b Mounting hole 11c Pressure bearing surface (step part)
12 Knockout plate 13 Punch 14 Punch plate 15 Packing plates 20 and 50 Knockout device 21 Lower part of main body 21a Flange (lower part of main body)
21b Cylindrical shaft (at the bottom of the main unit)
21c Shaft hole (at the bottom of the body)
22 Upper body 22a Flange (upper body)
22b Tubular shaft (upper part of main body)
22c Shaft hole (on top of main unit)
23 connecting bolt 24 spring member 25 spring receiving member 26 set screw 30 lower mold holder 31 die plate 32 die 32a punching hole 33 product guide 51 pressing member (coil spring)
W products

Claims (2)

The upper mold side having a punch with respect to the lower mold side having a die is moved up and down, a punching mold punching the product into a predetermined shape, the spring member is held by the lower flange and the spring receiving member a stripper for separating the unitized knocked out device is inserted from below into the mounting hole formed in the upper holder to the product punched suspended vertically movable with respect to the upper holder from the punch wherein between the knockout equipment, punching mold, characterized in that a telescopic pushing means for biasing the knock-out device upwards. A spring member is provided on the outer periphery of the main body which is composed of two cylindrical bodies and has an upper flange and a lower flange, and the spring member is sandwiched between the lower flange and a spring receiving member provided on the upper outer periphery of the main body. is allowed Rutotomoni, by mounting the connecting screw in an axial hole formed in the main body, a mounting structure for punching die of said two cylindrical bodies were integrated unitized knockout device,
While inserting the knockout device into the mounting hole formed in the upper mold holder from below,
By retracting a coil spring between the stripper suspended so as to be movable up and down with respect to the upper holder and the knockout device so that at least the upper part is accommodated in the lower part of the axial hole , mounting structure for said via connecting screw, punching mold knockout device which is characterized in that is pressed against the spring receiving downward Bearing surface member formed in the mounting hole.

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