JP2016147289A - Metal mold of press working apparatus, and press working apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press working apparatus capable of working a workpiece with high accuracy at a fast working speed and with a long metal mold life.SOLUTION: In a metal mold of a press working apparatus 1, a workpiece is placed between a lower die 30 and an upper die 10, the upper die 10 is pressed toward the lower die 30 in a first direction, and the workpiece is worked. The upper die 10 includes: an action end 13 which is brought into contact with the workpiece so as to perform mold push; a vibration end 14 which is provided on an opposite side of the action end 13 along the first direction and to which vibration is given; a pair of holding sections 15 which are separated in a second direction orthogonal to the first direction and are provided between the action end 13 and the vibration end 14, fix the upper die 10 and transmit driving force in the first direction to the upper die 10; a hole which passes through the upper die 10 in a third direction orthogonal to each of the first direction and the second direction and is provided between the pair of holding sections 15.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a die for a press working apparatus and a press working apparatus.

  In general, separation processing, molding processing, and the like are known as press processing. And the apparatus used for these processes is generally called a press processing apparatus. The press working apparatus, for example, places a workpiece between molds consisting of an upper mold (also called a punch) and a lower mold (also called a die), presses the workpiece with these molds, and presses the workpiece. The workpiece is processed into a desired shape.

  Separation processing forms a shape by cutting a workpiece. For example, as an example of separation processing, a punching process is known in which a workpiece is placed on a lower mold and a shape is extracted with the upper mold. As the forming process, for example, a bending process for bending a workpiece, a drawing process for stretching and molding a workpiece, and the like are known.

Japanese Patent Laid-Open No. 2003-181569

  However, for example, in the separation process, so-called “flash” and “sag” occur at the start and end portions of the shear surface. These “burrs” and “sag” states vary depending on the thickness of the workpiece plate, the type of workpiece, the machining speed, the clearance, and the like. If “sag” occurs frequently, the flatness of the shearing surface is impaired, which is a problem when the flatness of the shearing surface is required. In addition, since the “burr” has a sharp tip, it causes injury and product failure.

  Further, in the forming process, there is a risk of quality deterioration due to the occurrence of so-called “scratches” and “cracks” during bending due to the thickness of the plate of the workpiece, the type of workpiece, the machining speed, the clearance, and the like. Further, in drawing, there is a possibility that so-called “wrinkles” and “cracks” may occur depending on the thickness of the plate of the workpiece, the type of workpiece, the machining speed, the clearance, and the like.

  Therefore, an object of the present invention is to provide a die for a press working apparatus and a press working apparatus capable of processing a workpiece with high accuracy and improving the quality of a press-processed product.

  The mold of the press working apparatus according to one embodiment places a workpiece between a lower die and an upper die, presses the upper die toward the lower die in a first direction, and A die of a press working apparatus for processing, wherein the upper die is provided on an opposite side of the working end along the first direction with a working end that comes into contact with and pushes the workpiece and vibrates. Is provided between the working end and the vibration end and spaced apart in a second direction orthogonal to the first direction, and fixes the upper mold and the first to the upper mold. A pair of holding portions for transmitting a driving force in the direction of the first and second portions penetrating the upper mold in a third direction orthogonal to the first direction and the second direction, respectively, and provided between the pair of holding portions Having a hole formed therein.

  The press processing apparatus according to an embodiment places a workpiece between a lower die and an upper die, presses the upper die toward the lower die in a first direction, and processes the workpiece. A press working device that includes a drive mechanism that reciprocates the upper die in a first direction, and a vibrator that is fixed to the upper die and that vibrates the upper die. A working end that contacts and presses the workpiece, a vibration end that is provided on the opposite side of the working end along the first direction, and that is subjected to vibration, and a second that is orthogonal to the first direction A pair of holding portions provided between the working end and the vibration end so as to be spaced apart from each other in the direction of fixing the upper mold and transmitting the driving force in the first direction to the upper mold; Between the pair of holding portions through the upper mold in a direction perpendicular to the direction and the second direction. Has a hole provided, the.

  ADVANTAGE OF THE INVENTION According to this invention, the metal mold | die and press work apparatus of a press work apparatus which can process a workpiece with high precision and can improve the quality of a press work product can be provided.

FIG. 1 is a schematic view showing the structure of a press working apparatus according to an embodiment of the present invention. FIG. 2 is a schematic view of the movable side portion of the press working apparatus of FIG. 1 as viewed from the direction F2. FIG. 3 is a schematic view of the fixed side portion of the press working apparatus of FIG. 1 as viewed from the direction F3. 4 is a perspective view of an upper die fixed to the press working apparatus of FIG. FIG. 5 is a diagram of a vibration simulation result showing how vibration is transmitted to the upper mold of FIG. FIG. 6 is a diagram of a vibration simulation result showing how vibration is transmitted to the upper mold of FIG. FIG. 7 is a photograph of a cut surface of the workpiece W when the upper mold according to the present embodiment is subjected to vibration and separated. FIG. 8 is a photograph of a cut surface of the workpiece W when vibration is applied to the upper mold according to the present embodiment and separation processing is performed. FIG. 9 is a photograph of a cut surface of the workpiece W when separation processing is performed using a conventional mold. FIG. 10 is a photograph of a cut surface of the workpiece W when separation processing is performed using a conventional mold.

  Hereinafter, the press processing apparatus 1 which concerns on one Embodiment of this invention is demonstrated. In addition, although the metal mold | die (the upper mold | type 10 and the lower mold | type 30) for the purpose of isolation | separation processing is attached to the press work apparatus 1 which concerns on this embodiment, the metal mold | die which can be used for this press work apparatus 1 Is not limited to this. For example, the press working apparatus 1 of the present embodiment can be used for other press working such as bending and drawing. In addition, the present invention can be applied to dies used in general press work such as punching, bending, drawing, forming, compression, and joining.

  FIG. 1 is a schematic view showing a main structure around a mold of the press working apparatus 1.

  An imaginary line O indicated by a broken line is a straight line in the Z direction passing through the center of mass G of the upper mold 10. In the following description, this imaginary line O is referred to as a central axis O. Note that the movable side portion 2 described below is reciprocally driven along the central axis O by the drive mechanism 6, and the workpiece is between the upper die 10 of the movable side portion 2 and the lower die 30 of the fixed side portion 3. Separation processing is performed across W.

  The press working apparatus 1 includes a movable side portion 2 having an upper die 10 and a fixed side portion 3 having a lower die 30. The movable side portion 2 includes an upper mold 10, fixing plates 44 a and 44 b that fix the upper mold 10, and a support body 47 that fixes the fixing plates 44 a and 44 b to the upper mold holder 41. The upper mold holder 41 and the support body 47 are fixed with bolts 46. Similarly, the support 47 and the fixing plates 44 a and 44 b are fixed by bolts 46. The upper mold 10 is fixed by the fixing plates 44a and 44b only at two holding portions 15 described later, and other portions are not fixed. That is, when the upper mold 10 is vibrated by the vibrator 20 described later, the vibration is not transmitted to the stripper 45 or the support 47.

  The movable portion 2 includes a stripper 45 for peeling off the workpiece W when it is attached to the upper mold 10, a spring 48 for biasing the stripper 45 toward the lower mold 30, and a guide for stabilizing the posture of the stripper 45. It has a pin 43. A vibrator 20 is provided at the vibration end 14 of the upper mold 10 described in detail below.

  The fixed side portion 3 includes a lower mold 30 and a lower mold holder 42 that fixes the lower mold 30. The lower mold 30 has a hole 31 having a shape corresponding to the shape of the upper mold 10 and a hole 33 for receiving the guide pin 43. The press working apparatus 1 includes a drive mechanism 6 such as a motor, a flywheel, and the like, a control mechanism (not shown) for controlling these, a safety device (not shown), etc. It has.

  FIG. 2 is a schematic view of the movable side portion 2 of the press working apparatus 1 shown in FIG. 1 as viewed from the direction of the arrow F2 in FIG. The stripper 45 is a rectangular plate-like member having a hole through which the upper mold 10 is passed at the center. The stripper 45 is provided so as to be movable in the direction of the central axis O along the two guide pins 43.

  Further, as indicated by a broken line, a columnar vibrator 20 is provided in the center of the upper mold 10 on the vibration end 14 side. The vibrator 20 is fixed to the vibration end 14 of the upper mold 10 so that the center axis thereof overlaps the center axis O.

  FIG. 3 is a schematic view of the fixed side portion 3 of the press working apparatus 1 shown in FIG. 1 as viewed from the direction of the arrow F3 in FIG. The lower die 30 is a rectangular metal member having a predetermined thickness, and is laminated on the lower die holder 42 and fixed by bolts 34. In the center of the lower mold 30, a hole 31 is formed that is shaped in a shape corresponding to the upper mold 10. The hole 31 is formed slightly larger than the upper mold 10, and a predetermined clearance is provided between the upper mold 10 and the hole 31. The predetermined clearance is a gap between the upper mold 10 and the hole 31 of the lower mold 30 that is appropriately designed according to the plate thickness, material characteristics, processing accuracy, and the like of the workpiece W.

  Subsequently, the upper mold 10 will be described with reference to FIGS. 1 and 4.

  FIG. 4 is a perspective view of the upper mold 10. Hereinafter, the driving direction (up and down direction in the drawing) of the upper mold 10 is defined as the Z direction (first direction), and the left and right direction in the drawing orthogonal to the Z direction is defined as the X direction (second direction). An orthogonal front-rear direction in the drawing is a Y direction (third direction). A central axis O along the Z direction passes through the mass center G of the upper mold 10. The first virtual plane P that is orthogonal to the central axis O and passes through the mass center G of the upper mold 10 is a plane that bisects the upper mold 10 along the central axis O.

  A surface that overlaps the central axis O and bisects the upper die 10 along the XZ plane is defined as a second virtual surface R. A surface that passes through the central axis O and is orthogonal to the first virtual surface P and the second virtual surface R and bisects the upper mold 10 along the YZ plane is defined as a third virtual surface S. A line passing through the center of mass G and orthogonal to the central axis O and extending along the Y direction is defined as an imaginary line Q.

  The upper mold 10 according to the present embodiment is a metal rectangular block-shaped member. The upper mold 10 has a vibration surface 14a orthogonal to the central axis O at one end (vibration end 14) in the drive direction, and a work surface 13a (see FIG. 5) orthogonal to the central axis O at the other end (action end 13) in the drive direction. 2). The vibration surface 14a and the action surface 13a are congruent. The upper mold 10 has four side surfaces that connect each side of the vibration surface 14a and each side of the action surface 13a. Two curved surfaces intersecting the imaginary line Q are defined as a first side surface 17, and other two flat surfaces along the YZ plane are defined as a second side surface 18.

  A convex holding portion 15 extending in the Y direction along the first virtual surface P is integrally provided at an intermediate position in the Z direction between the two second side surfaces 18. These two holding portions 15 are fixed to the movable portion 2 by the fixing plates 44a and 44b.

  The first side surface 17 is formed in accordance with the curved peripheral shape of the corresponding side of the working surface 13a. That is, the first side surface 17 is formed in a shape that matches the processing shape of the workpiece W. In the present embodiment, the first side surface 17 is formed in a shape recessed in an arc shape toward the center of mass G. For example, as shown in FIG. 3, when the processed shape of the workpiece W is a gear type, the first side surface 17 is provided with corresponding irregularities. The two first side surfaces 17 have the same shape. In other words, the upper mold 10 is formed so as to be symmetrical via the second virtual plane R.

  The upper mold 10 has a hole 16 that connects the two first side surfaces 17 and penetrates the upper mold 10 in the Y direction. The hole 16 has an oval cross-sectional shape extending in the Z direction. The center of mass G of the upper mold 10 is at the center of the hole 16.

  The upper mold 10 is a symmetric shape that is bisected by the first virtual plane P. The lower mold 30 side is referred to as the first portion 11 across the first virtual surface P. The upper mold holder 41 side is referred to as the second portion 12 with the first virtual surface P interposed therebetween. The first portion 11 and the second portion 12 are integrally formed of the same metal material. Therefore, the mass of the 1st part 11 and the 2nd part 12 is substantially the same. Here, “substantially the same” includes those that fall within a preset tolerance range.

  The first portion 11 has a working surface 13a that presses the workpiece W in contact with the workpiece W shown in FIG. Further, the second portion 12 has a vibration surface 14 a that fixes the vibrator 20 and serves as a start position of vibration to the upper mold 10. Furthermore, the upper mold 10 has an oval hole 16 that passes through the upper mold 10 along the virtual line Q.

  In order to make the mass of the 1st part 11 and the 2nd part 12 the same, the hole 16 is provided in the position which the 1st virtual surface P bisects the volume. The shape of the hole 16 is not limited to the shape shown in the figure. The shape and position of the hole 16 are designed based on the vibration simulation of the upper mold 10 and are determined so that vibration is transmitted most efficiently from the vibration surface 14a to the working surface 13a.

  Further, the upper mold 10 according to the present embodiment is formed so as to be symmetric with respect to the second virtual plane R. Further, the upper mold 10 is formed so as to be symmetric with respect to the third virtual plane S.

  The vibrator 20 is, for example, a cylindrical member, and is a device that oscillates an object by oscillating a predetermined frequency from one end. The vibration frequency is not particularly defined, but if the sound wave vibration in the audible range is used, the operation sound of the vibrator 20 may be anxious in press working, and the vibration frequency in the so-called ultrasonic range that is a non-audible range is set. Used.

  In the present embodiment, as shown in FIG. 1, the vibrator 20 is provided in contact with the vibration surface 14 a of the upper mold 10. Further, as shown in FIG. 2, the vibrator 20 is fixed to the upper mold 10 so that the central axis O passing through the mass center G of the upper mold 10 and the central axis of the vibrator 20 overlap each other. The vibration frequency oscillated from the vibrator 20 is a so-called ultrasonic wave. Specifically, the frequency of vibration oscillated from the vibrator 20 is, for example, in the range of 10 kHz to 30 kHz. The vibration oscillated from the vibrator 20 causes the upper mold 10 to vibrate in the Z direction. The frequency given from the vibrator 20 to the upper mold 10 is not limited to the above range.

  The frequency of vibration applied to the upper mold 10 varies depending on the mass and shape of the upper mold 10 or the size and position of the holes 16. For this reason, when the shape of the upper mold | type 10 is fixed, the frequency of the optimal vibration is measured using vibration simulation. Specifically, the optimum vibration frequency given to the upper mold 10 is a frequency at which vibration from the vibration surface 14a is efficiently conducted to the working surface 13a. This is, for example, in the vicinity of the natural frequency of the upper mold 10, and the frequency at which resonance occurs is selected.

  Subsequently, an operation of punching the workpiece W by the press working apparatus 1 according to the present embodiment will be described. The operator turns on the press working apparatus 1 and drives the drive mechanism 6 of the press working apparatus 1. After the press working apparatus 1 is driven, the vibrator 20 fixed to the vibration end 14 is driven. The vibration generated from the vibrator 20 is conducted to the upper mold 10. The upper mold 10 starts fine high-speed vibration in the Z direction. Subsequently, the worker places the workpiece W on the surface 32 facing the upper mold 10 of the lower mold 30. At this time, the operator confirms the punching position of the workpiece W and sets the workpiece W at a predetermined position on the surface 32. Then, the operator operates the press working device 1 to close the upper die 10 fixed to the movable side portion 2 toward the lower die 30 fixed to the fixed side portion 3 (Z direction). Make it work. Thereby, first, the stripper 45 of the movable side portion 2 comes into contact with the workpiece W and presses the workpiece W. When the movable side portion 2 is further driven, the upper die 10 protrudes from the hole in the central portion of the stripper 45, contacts the workpiece W, and punches the workpiece W. Thereafter, the upper mold 10 is inserted into the hole 31 of the lower mold 30.

  When the punching operation of the workpiece W by the upper mold 10 is completed, the movable side portion 2 is driven in the reverse direction, and the upper mold 10 is separated from the lower mold 30. At this time, the stripper 45 returns to the position shown in FIG. 1 by the urging force of the spring 48 and peels off the workpiece W adhered to the upper mold 10.

  Next, a description will be given of the results of verification using vibration simulation on how the vibration applied from the vibrator 20 is transmitted to the vibration surface 14a of the upper mold 10 to the working surface 13a. The result of the vibration simulation of the upper mold 10 is shown in FIGS. First, the vibration simulation of the upper mold 10 will be described.

  First, the upper mold 10 to be incorporated in the press working apparatus 1 is designed on a computer. Vibration simulation was performed using the designed upper mold 10 (hereinafter referred to as the upper mold model 10a). In addition, also in the upper mold model 10a, portions common to the upper mold 10 are denoted by the same reference numerals, and detailed description thereof is omitted. The vibration simulation is a state of vibration conduction in the upper model 10a when various vibrations are applied from the vibration end 14 of the upper model 10a designed on a computer, and a state of deformation of the upper model 10a. This is to visually represent and to understand its characteristics.

  5 and 6 show the upper mold model 10a as viewed from the Y direction shown in FIG. Briefly, the vibration end 14 is shown on the upper side of the drawing, the working end 13 is shown on the lower side of the drawing, and two holding portions 15 are shown at intermediate positions between the vibration end 14 and the working end 13. In addition, an oval hole 16 is shown at the center of the upper model 10a. Further, the lower part in the figure is the first part 11, and the upper part in the figure shows the second part 12. In the vibration simulation, the upper model 10a is simulated on the assumption that the upper model 10a is fixed to the fixed plates 44a and 44b of the movable portion 2 as shown in FIG.

  The points represented by white stripes in FIGS. 5 and 6 indicate locations where vibrations are generated in the upper model 10a in the vibration simulation. In the vibration simulation, the vibration given to the upper mold model 10a is mainly composed of the vibration of the component that vibrates the upper mold model 10a in the first direction (hereinafter referred to as the vertical vibration 51).

  When a vibration having a frequency close to the natural frequency of the upper model 10a and a frequency at which the upper model 10a resonates was given to the vibration end 14 of the upper model 10a, good simulation results were obtained. That is, according to this upper model 10a, it was found that the vibration applied from the vibration end 14 is conducted without being attenuated to the action end 13, and the vibration applied to the vibration end 14 can be reproduced by the action end 13. In other words, when the upper model 10a is given a vibration at a certain frequency, it vibrates at high speed in the vertical direction along the central axis O although it is fixed by the holding portion 15.

  This result will be described in more detail. The vibration given from the vibration end 14 is conducted as the vibration 51 in the vertical direction toward the action end 13. The energy of the vibration 51 in the vertical direction changes its direction at the position of the fixed holding unit 15. That is, a clear white stripe pattern indicating the energy of the vibration 51 in the vertical direction disappears and is shown as a white mist. In other words, the energy of the vertical vibration 51 spreads in the horizontal direction and changes to the horizontal vibration 52. As shown in FIGS. 5 and 6, the energy changed to the horizontal vibration 52 is converted into energy that opens and closes the hole 16 having an oval cross section in the X direction and vibrates the upper mold 10 in the horizontal direction. Is done. Thereafter, the vibration energy in the lateral direction is conducted to the first portion 11 side beyond the holding portion 15. The vibration energy exceeding the holding portion 15 that is the fixed position is reconverted into the vibration 51 in the vertical direction and transmitted to the working end 13.

  As described above, the upper model 10a converts the vibration continuously given from the vibrator 20 into the vibration energy in the lateral direction that repeats opening and closing of the hole 16 at the position of the holding portion 15 at a high speed. It was possible to prevent the vibration from being greatly attenuated and to conduct the vibration to the working end 13 side.

  On the other hand, in order to study the optimum conditions for vibration transmission, various types of upper models having shapes different from the upper model 10a of the present embodiment were designed and vibration simulations were similarly performed.

  As the verified upper model, for example, a model in which the hole 16 is not provided in the upper mold, a model in which the shapes of the first part 11 and the second part 12 are different, and masses of the first part 11 and the second part 12 Are different models, models in which the upper mold hole 16 does not penetrate, and the like. The vibration simulation setting conditions for the upper model for verification described above are the conditions (shape, mass, hole, etc.) other than the upper model model conditions (fixed state of holding unit, vibrator position, vibration component, etc.). The same conditions as those used for the vibration simulation of the upper model 10a were set.

  As a result, in any of the upper models, significant vibration attenuation was observed on the working end 13 side. That is, the upper model having these shapes cannot sufficiently transmit the vibration applied to the vibration end 14 to the action end 13.

  First, if the mass of the 1st part 11 and the 2nd part 12 differs, it is possible that it is difficult to reproduce the vibration of the 2nd part 12 in the 1st part 11 beyond the holding | maintenance part 15. FIG. Secondly, when the hole 16 does not penetrate or is not provided, there is no escape space for vibration transmitted from the vibration end 14, so that the vibration is greatly generated by the holding portion 15 that is a fixing portion of the upper mold 10. It may be attenuated. For example, it is considered that, for the above two reasons, in the other upper models described above, vibration could not be transmitted well to the working end 13. If the holding part 15 is eliminated and the upper die 10 can be maintained in a free state where it is not fixed, vibration transmission is possible even without the hole 16. However, without the holding portion 15, the driving force from the driving mechanism 6 of the press working apparatus 1 cannot be transmitted to the upper mold 10.

  Considering the above points, the preferable configuration conditions of the upper mold 10 obtained from the vibration simulation result are summarized as follows.

-The mass of the 1st part 11 and the 2nd part 12 is the same.
A hole 16 that penetrates the upper mold 10 along the virtual line Q is provided.
-It is symmetrical via the first virtual plane P.
-It is symmetrical via the second virtual plane R.
-It is symmetrical via the third virtual plane S.
-It is fixed by the holding part 15.
The above is a preferable configuration condition of the upper mold 10. However, depending on the shape of the upper mold 10, for example, the hole 16 does not necessarily have to be provided along the virtual line Q by vibration simulation, and is manufactured in consideration of the result of vibration simulation.

  Next, the difference between the shear surface of the workpiece W that has been separated using the upper mold 10 according to the present embodiment and the shear plane of the workpiece W of the comparative example will be described.

  7 and 8 are photographs of a cut surface of the workpiece W when separation processing is performed while applying vibration oscillated from the vibrator 20 to the upper mold 10 according to the present embodiment. On the other hand, FIG.9 and FIG.10 is a cut surface photograph of the to-be-processed material W at the time of performing a separation process using the metal mold | die which is not given the vibration as a comparative example. The same mold as that of the present embodiment was used as the mold of the comparative example.

<Processing conditions>
Machining conditions of upper mold according to this embodiment-Machining speed: 25 spm
・ Clearance: 0.03mm
・ Existence of vibration: Existence (20kHz)
Machining conditions of the upper mold used as a comparative example-Machining speed: 14 spm
・ Clearance: 0.2mm
-Presence / absence of vibration: None In addition, spm stands for Shot Per Minute and indicates how many press processes can be performed per minute. In this processing condition, it is used in the same meaning as RPM (Revolutions per minute).

<Conditions of workpiece W>
The workpiece W is formed of hot rolled mild steel plate (SPH), the plate thickness is 6 mm, and the processing shape is a gear shape. The other conditions for the press working apparatus 1 were the same.

  According to this embodiment, as shown in FIG. 7, the tooth tip 200 of the gear tooth was not cracked and could be accurately cut out along the mold shape. Further, as shown in FIG. 8, according to the present embodiment, almost no “sag” or “burr” was observed on the shear surface, the surface was cut off very smoothly, and no cracks or the like were generated.

  On the other hand, as shown in FIG. 9, in the comparative example, the tooth tip 200 of the gear tooth was cracked. Further, as shown in FIG. 10, according to the comparative example, the roughness of the shearing surface was conspicuous, and a crack was generated in part. Note that, as described above, the processing speed of the separation processing according to the present embodiment was about twice the processing speed of the conventional separation processing shown in FIGS. 9 and 10.

  As described above, according to the present embodiment, in the processing of the workpiece W of the same material having the same plate thickness, the processing accuracy can be increased and, in addition, the processing speed can be increased. In addition, according to the present embodiment, it is possible to suppress the occurrence of “burrs” and the like, so that the wear of the mold due to the friction between the mold (upper mold 10 or lower mold 30) and the workpiece W during processing is prevented. Can be reduced. For this reason, if press working is performed while applying vibration to the upper mold 10 as in the present embodiment, the life of the mold can be extended by a factor of about two.

  The upper mold 10 of the present embodiment has a shape capable of conducting to the working end 13 without substantially attenuating vibration in the first direction (Z direction) oscillated from the vibrator 20. The press working apparatus 1 according to the present embodiment operates the vibrator 20 continuously for one step (one stroke) from the time when separation processing is started to the time when processing is finished, and the upper die 10 is moved along the central axis O. Vibrate continuously. This vibration reduces the frictional force between the workpiece W and the upper die 10 when the working end 13 of the upper die 10 and the workpiece W are in contact with each other. For this reason, it can be reduced that the workpiece W is not caught on the upper mold 10 side. Furthermore, by reducing the frictional force between the workpiece W and the upper mold 10, it is economical because the amount of lubricating oil used can be reduced.

  Further, the vibration along the central axis O of the upper mold 10 gives a large number of continuous pressures to the workpiece W during one stroke of the upper mold 10. For this reason, even if it is the workpiece W of the hot rolled mild steel plate (SPH) whose thickness is 5 mm or more conventionally considered that separation processing is difficult, resistance can be reduced and separation processing can be performed. For example, in the separation test using the upper mold 10 of this embodiment, it is possible to separate and process the workpiece W of hot rolled mild steel plate (SPH) up to a thickness of about 12 mm while maintaining the processing accuracy. Met.

  In addition, by using the press working apparatus 1 and the mold (upper mold 10 and lower mold 30) according to the present embodiment, for example, a material in which glass fiber is impregnated as a work material W or CFRP (carbon fiber) Even in the case of a material containing a fibrous material such as (reinforced plastic), a good shear surface can be obtained without causing peeling of the fiber layer. Since the upper die 10 to which vibration is applied from the vibrator 20 can continuously apply a number of times of pressure to the workpiece W in one stroke, along the XY plane orthogonal to the central axis O. Laminated carbon fibers can also be cut well.

  In the press working apparatus 1 according to the present embodiment, the working speed of the hot-rolled mild steel plate (SPH) having a thickness of about 6 mm is greatly increased as compared with the prior art while maintaining the working accuracy. Can be raised. Specifically, as shown in FIGS. 7 and 8, even when the processing speed was about twice that of the comparative example, no reduction in processing accuracy was observed. Therefore, by using the press working apparatus 1 according to this embodiment, mass productivity can be dramatically improved.

  Further, the present invention is not limited to the above embodiment. In the embodiment described above, only the separation process is described among the press processes. However, the press process apparatus 1 according to the present embodiment can be applied to other press processes, for example, by exchanging a die. Can do.

  For example, the press working apparatus 1 can also be used for bending. Here, the bending process is a process of bending a part of the workpiece W by sandwiching the workpiece W between the upper mold and the lower mold. In bending, “cracking” and “scratches” at the bent part may be a problem. This problem occurs when a large pressure is applied to the bent portion of the workpiece W when the plate thickness of the workpiece W is too thick or the bent portion is not sufficiently round.

  Therefore, for example, the upper mold 10 for bending is designed so as to satisfy the preferable configuration conditions of the upper mold 10 verified in the above-described separation process. The upper mold 10 for bending is used in combination with the vibrator 20 to bend the workpiece W while applying multiple pressures to the workpiece W once in the stroke of the upper mold 10. For this reason, concentration of the pressing force is prevented and occurrence of “cracking” and “scratches” is suppressed. Further, even a workpiece having a thicker plate thickness than before can be processed without increasing the size of the press working apparatus.

  Moreover, by using the press working apparatus 1 according to the present embodiment for bending, it is possible to suppress the occurrence of a springback that causes the so-called bending working accuracy to deteriorate. Specifically, since the upper mold 10 vibrates in the direction of the central axis O by the vibrator 20, even when the upper mold 10 and the lower mold 30 sandwich the workpiece W, the upper mold 10 is continuously pressed many times. Pressure is applied to the workpiece W. For this reason, the force which returns to the original which has generate | occur | produced in the bending part of the workpiece W is suppressed by the pressure of the upper mold | type 10 accompanied by a high-speed vibration. Thereby, it is considered that the spring back of the workpiece can be suppressed and the workpiece W can be bent at a desired angle at a time.

  Further, for example, the press working apparatus 1 according to the present embodiment can also be used in drawing. Drawing is a process of creating a cylindrical material in which one end without a joint is closed by sandwiching a plate-shaped workpiece with a mold composed of an upper mold and a lower mold. . In the drawing process, the workpiece is pushed into the lower mold by the upper mold and is stretched by the tensile force to reduce the plate thickness. And the part around the part pushed by the upper mold | type of a workpiece moves to a center direction with the pushing operation | movement of an upper mold | type.

  For this reason, in drawing, the balance between the force for pulling the workpiece by the upper die and the force for pressing the workpiece on the outer periphery is important. If this balance is lost, “wrinkles” may occur in the outer peripheral portion of the workpiece, and “cracking” may occur in the portion where the upper die is pushed into the lower die.

  For example, the upper die 10 for drawing used in the press working apparatus 1 according to the present embodiment is used for drawing, which is designed to satisfy the preferable configuration conditions of the upper die 10 verified in the above-described separation processing. Upper mold 10. The upper die 10 for drawing is used in combination with the vibrator 20 so as to draw the workpiece W while applying a large number of pressures to the stroke of the upper die 10 once.

  This multiple times of pressure reduces the residual stress of the workpiece W stretched by the tensile force, and suppresses the occurrence of the above-mentioned “crack” and “wrinkle”. Further, the drawing using the press working apparatus 1 in the present embodiment can improve the limit drawing ratio.

Moreover, in this embodiment, although the workpiece W has shown the hot rolled mild steel plate (SPH) and CFRP, the workpiece W is not restricted to this.
Of course, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Press processing apparatus, 2 ... Movable side part, 3 ... Fixed side part, 6 ... Drive mechanism, 10 ... Upper mold | type, 11 ... 1st part, 12 ... 2nd part, 13 ... Action end, 14 ... Vibration end, DESCRIPTION OF SYMBOLS 15 ... Holding part, 16 ... Hole, 20 ... Vibrator, 30 ... Lower mold, 31 ... Hole, 32 ... Surface, 33 ... Hole, 41 ... Upper mold holder, 42 ... Lower mold holder, 43 ... Guide pin, 44a ... Fixed plate, 44b ... Fixed plate, 45 ... Stripper, 46 ... Screw, 47 ... Support, 48 ... Spring, 51 ... Longitudinal vibration, 52 ... Lateral vibration.

Claims (10)

A work piece is placed between a lower die and an upper die, the upper die is pressed in a first direction toward the lower die, and the die of a press working apparatus for working the work material,
The upper mold is
An action end that contacts and embosses the workpiece;
A vibration end provided on the opposite side of the working end along the first direction and provided with vibration;
The upper end is fixed and the driving force in the first direction is transmitted to the upper mold while being spaced apart in a second direction orthogonal to the first direction and provided between the working end and the vibration end. A pair of holding portions;
A hole provided between the pair of holding portions through the upper mold in a third direction orthogonal to the first direction and the second direction,
A die for a press working apparatus. The upper mold includes a first portion including the working end;
A second part including the vibration end formed integrally with the first part,
The first portion and the second portion have the same mass through a flat first imaginary plane that passes through the center of mass of the upper mold and is orthogonal to the first direction. The metal mold | die of the described press processing apparatus. The upper mold includes a first portion including the working end;
A second portion formed integrally with the first portion and including the vibration end,
The first portion and the second portion are symmetrical with respect to a flat first imaginary plane perpendicular to the first direction between the first portion and the second portion. Item 2. A die for a press working apparatus according to Item 1.   3. The press working apparatus according to claim 2, wherein the upper die is symmetrical with respect to the second imaginary plane passing through the center of mass and along the first direction and the second direction. Mold.   3. The press working apparatus according to claim 2, wherein the upper die is symmetrical with respect to the third virtual plane passing through the center of mass and extending along the first direction and the third direction. Mold.   The die of the press working apparatus according to claim 1, wherein the hole has an oval cross-sectional shape along the first direction. A press working device for processing a workpiece by placing a workpiece between a lower die and an upper die, pressing the upper die toward the lower die in a first direction, and
A drive mechanism for reciprocatingly driving the upper mold in the first direction;
A vibrator that is fixed to the upper mold and that vibrates the upper mold,
The upper mold is
An action end that contacts and embosses the workpiece;
A vibration end provided on the opposite side of the working end along the first direction and provided with vibration;
The upper end is fixed and the driving force in the first direction is transmitted to the upper mold while being spaced apart in a second direction orthogonal to the first direction and provided between the working end and the vibration end. A pair of holding portions;
A hole provided between the pair of holding portions through the upper mold in a third direction orthogonal to the first direction and the second direction,
A press working apparatus. The upper mold includes a first portion including the working end;
A second part including the vibration end formed integrally with the first part,
8. The first portion and the second portion have the same mass across a flat first imaginary plane that passes through the center of mass of the upper mold and is orthogonal to the first direction. The press working apparatus as described.   The press working apparatus according to claim 8, wherein the vibrator is provided such that a center axis of the vibrator passes through the center of mass of the upper mold.   The press working apparatus according to claim 7, wherein the vibrator mainly oscillates a vibration component that vibrates the upper die in the first direction.