JP4884815B2 - Press working apparatus and press method - Google Patents

Description

  The present invention relates to a press working apparatus and a pressing method thereof, and more particularly, to a press working apparatus and a pressing method for pressing a precision metal part such as a connector used in a harness or an integrated circuit at high speed.

  2. Description of the Related Art Conventionally, it is known to perform high-speed press processing of precision metal parts such as connectors used for harnesses and integrated circuits using a press processing device using a progressive die or the like.

  Here, the thing like the following patent document 1 is known as a general press processing apparatus. In Patent Document 1, a die is attached to a lower holder of a press working apparatus via a die plate, a punch is attached to an upper holder attached to a slide via a punch plate, and further attached downward by a compression spring. There is disclosed a press working apparatus in which a stripper plate is provided on an upper die.

  The stripper plate disclosed herein is provided to hold the workpiece on the die plate side immediately before pressing, and is generally provided on the upper die with a compression spring interposed therebetween.

  The provision of a stripper plate or the like with a compression spring interposed in this manner is also described in Patent Document 2 below.

Japanese Patent Laid-Open No. 7-60375 Japanese Unexamined Patent Publication No. 2000-700

  By the way, in recent years, there is a case where pressing is performed in an ultra-high speed region due to a demand for reduction of production cost, and the pressing is performed in an ultra-high speed region where the number of continuous strokes per minute is 1000 times or more (1000 spm or more). In some cases.

  However, when the press working device is used in such an ultra-high speed region, the stripper plate with the compression spring moves downwards earlier than the upper die due to the influence of inertial force, and the die Even if there is a phenomenon that the impact increases due to early contact with the plate, or even when there is no influence of inertial force, when the stripper plate contacts the die plate, an excessive impact is generated. A phenomenon that the compression spring could not absorb this impact and the stripper plate reciprocated up and down and hit the die plate more than once occurred.

  Due to such a phenomenon of the stripper plate, abnormal pressurization of the mold and breakage of parts occur on the press working apparatus side, and deformation and dimensional variation occur on the product side.

  Accordingly, the present invention relates to a press working apparatus and a press method for performing high speed press working, in which an impact at the time of contact of the stripper plate with the die plate in the ultra high speed region is reduced, and abnormal vibration of the mold in the press working apparatus is generated. It is an object of the present invention to provide a press working apparatus and a press method capable of solving problems such as breakage of parts and problems, deformation of the product, and variations in dimensions.

The press working apparatus according to the present invention includes an upper mold that reciprocates in the vertical direction and a lower mold fixed to the apparatus, and the upper mold is provided with a stripper plate that is biased downward via an elastic member. The lower mold is provided with a die plate at a position facing the stripper plate, and the die plate is urged upward by elastic means, and the die plate is being lowered while the stripper plate is being lowered. previously in contact than it is provided with a damper member sink into the die plate when in contact.

According to the above configuration, since the damper member is provided on the die plate, the stripper plate that moves to the die plate side (lower side) is pressed ahead of the die plate when performing press working in the ultra-high speed region. The damper member comes into contact with the die plate and sinks into the die plate while reducing the impact of the stripper plate.
For this reason, the damper member can suppress the movement due to the inertial force of the stripper plate, etc., and can alleviate the impact at the time of contact with the die plate.

In particular, since the damper member sinks into the die plate, the press work itself is not hindered by the presence of the damper member.
The “damper member” is preferably made of metal in order to improve durability, but may be made of rubber, synthetic resin, or the like in order to attenuate the impact generated on the damper member itself. .

  Further, the above-mentioned “die plate” is not limited to a single die plate but may be a unit body including a die plate.

In one embodiment of the present invention, the biasing force of the elastic means of the damper member is set lower than the biasing force of the elastic member of the stripper plate.
According to the above configuration, when the damper member comes into contact with the stripper plate, the damper member surely sinks into the die plate without resisting the downward biasing force applied to the stripper plate.
For this reason, even if a damper member is provided for shock mitigation, the work pressing and holding function of the work, which is the main function of the stripper plate, is not hindered.
Therefore, the impact of the stripper plate can be reduced while ensuring the function of the stripper plate.

In one embodiment of the present invention, a plurality of the damper members are provided.
According to the said structure, the impact burden of the stripper plate per damper member can be reduced by providing a plurality of damper members. Moreover, a large stripper plate can be supported in a wide range by providing a plurality.
Therefore, the durability of the damper member can be improved, and the impact of the large stripper plate can be reliably mitigated.

In one embodiment of the present invention, the elastic means of the damper member is a coil spring.
According to the said structure, an urging | biasing force can be provided to a damper member by a simple structure by using an elastic means as a coil spring.
Therefore, the maintenance of the damper member can be easily performed, and the cost of the apparatus can be reduced as much as possible.

In one embodiment of the present invention, the elastic means of the damper member is an air spring.
According to the said structure, an urging | biasing force can be adjusted by adjusting an air pressure by using an elastic means as an air spring. Further, when not in use, the damper member can be prevented from being exposed at all on the die plate.
Therefore, the shock relaxation function of the damper member can be freely changed, and a more detailed shock relaxation function can be exhibited.

The press method of the present invention is a press method for pressing a workpiece by combining an upper die that reciprocates in a vertical direction with respect to a lower die fixed to the apparatus, and when the upper die is lowered, An impact mitigating step in which a stripper plate provided on the mold via an elastic member is brought into contact with a damper member provided in a freely movable manner on a die plate set on the lower mold , and comes into contact before the die plate in the middle of lowering; And a work holding step of holding the work by bringing the stripper plate into contact with the die plate after the relaxation step.
According to the above method, when the upper die is lowered, the shock relaxation step for contacting the damper member is provided before the workpiece holding step, so that the stripper plate always contacts the damper member before contacting the die plate. It will be.
For this reason, the stripper plate does not directly contact the die plate, but comes into contact with the die plate after the impact is reduced by the damper member.
Therefore, the impact at the time of contact with the die plate can be mitigated by suppressing the movement of the stripper plate due to the inertial force in the ultra-high speed region by the damper member.

  According to the present invention, the damper member can suppress the movement due to the inertial force of the stripper plate, etc., and can alleviate the impact at the time of contact with the die plate.

  Therefore, in the press processing apparatus and press method that perform high-speed press processing, the shock at the time of contact between the stripper plate and the die plate in the ultra-high speed region is alleviated, and abnormal vibration generation of the mold and part damage are caused in the press processing apparatus. Problems that occur, such as deformation and dimensional variation in the product can be solved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the first embodiment will be described with reference to FIGS. 1 is a schematic view of a press process including the high-speed press working apparatus of the present embodiment, FIG. 2 is a mold structure used in the press working apparatus, FIG. 3 is a detailed perspective view in which a lower mold unit is partially cut away, 4 is a detailed sectional view of the lower die unit, FIG. 5 is an explanatory view of the pressing operation of this embodiment, and FIG. 6 is an explanatory view of the pressing operation of the conventional structure.

  As shown in FIG. 1, the press process including the high-speed press processing apparatus 1 of the present embodiment is installed in a turntable 2 on which a metal strip (work) W that is a processing material is placed, and a soundproof box 3. A high-speed press working device 1 that presses a metal strip (work) W and an automatic winding device 5 that winds the pressed product (work) W around a reel 4 are configured.

  Among these, the high-speed press working apparatus 1 is provided with a feeding device 7 for feeding the metal strip (work) W fed from the Dern table 2 into the mold 6 of the high-speed press working apparatus 1. Further, the automatic winding device 5 is provided with an image inspection machine 8 for detecting the state (press shape or the like) of the pressed product W so as to perform quality control of the product W.

  The above-described high-speed press working apparatus 1 includes a slide 11 that reciprocates in a vertical direction at a high speed during press working, and a bolster 12 that is fixed to the apparatus 1. A lower die 30 is attached to the bolster 12.

  In the high-speed press working apparatus 1, a metal band (work) W is fed between the upper mold 20 and the lower mold 30, and the slide 11 is reciprocated at a high speed to press the metal band.

Next, a mold structure used in the high-speed press working apparatus 1 will be described with reference to FIG.
The die 6 is provided with a lower die set 31 mounted on the bolster 12 (see FIG. 1) below, and a die plate 33 is installed on the upper surface of the die 6 via a die banking plate 32. The die plate 33 is provided with a die (not shown).

  On the other hand, an upper die set 21 to be mounted on the above-described slide 11 (see FIG. 1) is provided above the mold 6, and a punch plate 23 is installed on the lower surface thereof via a punch banking plate 22. Yes. The punch plate 23 is also provided with a punch (not shown).

The upper die set 21 is provided with suspension bolts 24 and 24, collars 25 and 25, and compression springs 26 and 26, so that the stopper banking plate 27 and the stripper plate 28 are biased downward. It is installed so that it can swing up and down.
The stripper plate 28 and the like are provided to press and hold the workpiece on the die plate 33 side (downward) immediately before pressing, and are set so as to contact the workpiece before the punch of the punch plate 23. Yes.

  Further, between the upper die set 21 and the lower die set 31, a plurality of (two in the drawing) main posts 41, 41 and main bushes 42, 42 are installed on both sides so as to extend in the vertical direction. Thus, the upper die set 21 that moves up and down in response to the reciprocating movement of the slide 11 (see FIG. 1) is guided.

  Further, between the punch plate 23 and the die plate 33, a plurality of sub-posts 43, 43 are installed on both sides so as to extend in the vertical direction so that the vertical movement of the punch plate 23 is guided.

  Reference numeral 29 denotes a screw bolt that fixes the compression spring 26 inside the upper die set 21 and applies a downward biasing force to the compression spring 26.

  The lower die unit 31, the die banking plate 32, and the die plate 33 provided below the die 6 configured as described above constitute a lower die unit 34 that is a characteristic part of the present embodiment.

Next, the detailed structure of the lower mold unit 34 will be described with reference to FIG.
As described above, the lower die unit 34 includes the lower die set 31 at the lowermost end, and the die banking plate 32 and the die plate 33 are sequentially stacked on the lower die unit 31. In the present embodiment, four impact dampers 50 that are urged upward and can be raised and lowered are provided so as to protrude from the surface of the die plate 33.

  The impact damper 50 is configured to sink into the die plate 33, that is, the lower die unit 34 by contacting the stripper plate 28 (see FIG. 2) moving from above.

  The impact damper 50 is disposed below the abutting rod member 53 including a columnar portion 51 extending in the vertical direction and a boss portion 52 below it, and applies an upward biasing force to the abutting rod member 53. And a coil spring 54. Among these, the contact rod member 53 is made of metal in order to ensure durability. However, in order to attenuate the impact, the tip or the like may be made of rubber or synthetic resin.

  Further, for this impact damper 50, a rod through hole 55 is formed in the die plate 33 and the die banking plate 32, and a boss through hole 56 is formed in the lower die set 31, so that the lower part of the movement is widened. A space S is formed. Further, a screw bolt 57 is screwed and fixed to the lower portion of the boss through hole 56 in order to prevent the impact damper 50 from falling off.

  As shown in FIG. 4, the impact damper 50 is installed in the moving space S so that the contact rod member 53 can freely move in the vertical direction, and an upward biasing force is always applied from the lower coil spring 54. In the received state, it is installed in the lower mold unit 34.

  The biasing force of the coil spring 54 is set so that the contact rod member 53 can easily sink due to the lowering of the stripper plate 28. Desirably, the biasing force of the coil spring 54 is set to be lower than the biasing force generated by the compression spring 26 (see FIG. 2) provided inside the upper die set 21 described above.

  In this way, by setting the biasing force of the coil spring 54, the stripper plate 28 is securely crimped to the die plate 33 in a state where the stripper plate 28 reliably maintains the pressure-bonding holding force (downward biasing force) of the workpiece.

  Next, the press operation of the high-speed press working apparatus 1 of the present embodiment configured as described above will be described using FIG. 5 and FIG. 6 in comparison with the press operation of the conventional high-speed press working apparatus. In each figure, (A) shows the top dead center state, (B) shows the state of lowering, and (C) shows the bottom dead center state. The same components as those described above are denoted by the same reference numerals and description thereof is omitted.

  First, as shown in FIG. 6, in the conventional high-speed press working apparatus, a workpiece (not shown) is taken into a press space P between the stripper plate 28 and the die plate 33 when the upper die set 21 and the like are in the top dead center state. As the upper die set 21 and the like are lowered, the stripper plate 28 holds the workpiece on the die plate 33 side by pressure. Thereafter, when the upper die set 21 and the like shift to the bottom dead center state, the upper die set 21 and the like are completely lowered, and the workpiece is pressed with a punch and a die (not shown).

  When the press working speed is set to an ultra-high speed region in which the number of continuous strokes per minute is 1000 times (1000 spm) or more, as shown in (B), the stripper plate 28 is moved to the die plate 33 in an accelerated state. Contact will cause a large impact.

  That is, since the stripper plate 28 is installed on the upper die set 21 via the compression spring 26 as described above, the stripper plate 28 is lowered earlier than the lowering speed of the upper die set 21 due to inertial force. Thus, a large impact is generated by contacting the die plate 33 at an early stage.

  Even when there is no influence of inertial force, when the high speed region is reached, when the stripper plate 28 comes into contact with the die plate 33, an impact more than necessary is generated, and the compression spring 26 absorbs this impact. The phenomenon that the stripper plate 28 reciprocates up and down and hits the die plate 33 more than once occurs.

  When such a phenomenon occurs, abnormal noise is generated in the mold 6 on the press processing apparatus 1 side, and the durability of the mold 6 and the high-speed press processing apparatus 1 is reduced, and the risk of component damage increases. Furthermore, on the workpiece W side, there arises a problem that the workpiece is deformed or has dimensional variations.

  In order to eliminate the influence of the inertial force and the like, a method of increasing the urging force (spring coefficient) of the compression spring 26 is conceivable. However, if the urging force is excessively increased, the upper die set 21 or the like is not easily lowered. Therefore, there arises a problem that it becomes difficult to press the workpiece.

  Therefore, in the high-speed press working apparatus 1 of the present embodiment, the impact damper 50 is provided as described above to prevent the occurrence of an impact due to the inertial force or the like of the stripper plate 28.

  That is, as shown in FIG. 5, the high-speed press machine 1 of the present embodiment also takes a workpiece (not shown) into the press space P between the stripper plate 28 and the die plate 33 in the top dead center state. However, in this embodiment, as shown in (B), the impact damper 50 abuts against the stripper plate 28 during the descent, and the stripper plate 28 is prevented from descending to the die plate 33 at a stretch. This prevents the occurrence of a large impact.

  Thereafter, the stripper plate 28 is gently lowered to hold a workpiece (not shown) on the die plate 33 side, and then the upper die set 21 and the like are completely lowered to press the workpiece with a punch and a die (not shown). .

  As described above, in the present embodiment, the stage (impact mitigation stage) in which the stripper plate 28 comes into contact with the impact damper 50 is set before the stage in which the workpiece is pressed and held on the die plate 33 side (work holding stage). Therefore, the occurrence of impact can be prevented.

Next, the effect of this embodiment is explained in full detail.
In this embodiment, the lower die unit 34 is provided with an impact damper 50 that is urged upward by a coil spring 54 and sinks into the die plate 33 when the stripper plate 28 comes into contact therewith.

As a result, when pressing is performed in an ultra-high speed region, the impact damper 50 comes into contact with the stripper plate 28 that moves to the die plate 33 side before the die plate 33, and the impact of the stripper plate 28 is reduced. It will sink into the die plate 33.
For this reason, the impact damper 50 can suppress the movement of the stripper plate 28 due to the inertial force or the like in the ultra-high speed region, and can mitigate the impact at the time of contact with the die plate 33.
Therefore, in the high-speed press processing apparatus 1, the impact force at the time of contact of the stripper plate 28 with the die plate 33 at the time of ultra-high-speed processing is alleviated, and abnormal vibrations and component damage of the mold 6 in the press processing apparatus 1 occur. Problems that occur, such as deformation of the workpiece W and variations in dimensions can be solved.

In particular, since the impact damper 50 sinks into the die plate 33, the press work itself is not hindered by the presence of the impact damper 50.
In this embodiment, the urging force of the coil spring 54 of the impact damper 50 is set lower than the urging force of the compression spring 26 of the stripper plate 28.
Thus, when the impact damper 50 abuts on the stripper plate 28, the impact damper 50 surely sinks into the die plate 33 without resisting the downward biasing force applied to the stripper plate 28.
For this reason, even if the impact damper 50 is provided, the work pressing and holding function of the work, which is the main function of the stripper plate 28, is not hindered.
Therefore, the impact of the stripper plate 28 can be mitigated while ensuring the function of the stripper plate 28.

In this embodiment, a plurality of impact dampers 50 are provided.
Thereby, the impact burden from the stripper plate 28 per impact damper 50 can be reduced. Further, by providing a plurality, the large stripper plate 28 can be supported in a wide range.
Therefore, the durability of the impact damper 50 itself can be improved, and the impact from the large stripper plate 28 can be reliably mitigated.

In this embodiment, four impact dampers 50 are provided.
Thereby, the impact relief virtual surface which supports the stripper plate 28 can be constituted by the upper end portion of the impact damper 50 (F shown in FIG. 3), and the urging force can be equally applied to the stripper plate 28.
Therefore, even if the stripper plate 28 abuts on the impact damper 50, the stripper plate 28 moves up and down stably without being inclined, so that the impact of the stripper plate 28 can be more stably mitigated.
Note that this effect can be obtained if the “surface” can be configured. Therefore, if at least three impact dampers 50 are provided, the same effect as in the present embodiment can be obtained.

In this embodiment, a biasing force is applied to the impact damper 50 by the coil spring 54.
Thereby, the impact damper 50 can be comprised with a simple structure.
Therefore, maintenance of the impact damper 50 can be easily performed, and the cost increase of the high-speed press working apparatus 1 can be reduced as much as possible.

In the pressing method of this embodiment, when lowering the upper die set 21 and the like, an impact mitigating stage in which the stripper plate 28 is brought into contact with an impact damper 50 provided in a freely projecting and retracting manner on the die plate 33, and the impact mitigating stage. Thereafter, a workpiece holding stage is provided in which the stripper plate 28 is brought into contact with the die plate 33 to hold the workpiece.
According to the above configuration, when the upper die set 21 or the like is lowered, an impact mitigation stage in which the stripper plate 28 abuts on the impact damper 50 is provided before the work holding stage. Before coming into contact, the impact damper 50 must be contacted.
For this reason, the stripper plate 28 does not directly contact the die plate 33 but comes into contact with the die plate 33 after the impact is reduced by the impact damper 50.
Therefore, the impact damper 50 can suppress the movement of the stripper plate 28 due to the inertial force or the like in the ultra-high speed region, and can mitigate the impact at the time of contact with the die plate 33.
Therefore, in this pressing method, the impact force at the time of contact of the stripper plate 28 with the die plate 33 at the time of ultra-high speed processing is alleviated, and abnormal vibration of the die 6 or part damage in the press processing apparatus 1 occurs. Problems, such as deformation of the workpiece W and variations in dimensions, can be solved.

  Next, another embodiment will be described with reference to FIG. Note that FIG. 7 is a cross-sectional view corresponding to FIG. 4 of the above-described embodiment, and the other components are the same as those of the above-described embodiment, and thus description thereof is omitted. Also, the same components are denoted by the same reference numerals and description thereof is omitted.

  In this embodiment, the urging force of the impact damper 150 is generated by the air spring 100 instead of the coil spring 54 of the above-described embodiment.

  Specifically, as shown in FIG. 4, the sliding piston 101 is installed below the contact rod member 153, and the air supplied from the outside is sealed in the lower space 102 so as to move in the vertical direction. An air spring 100 having an elastic force is configured. In addition, seal members 103 and 104 are provided around the sliding piston 101 and the screw bolt 157 to ensure sealing performance.

  The air supplied to the air spring 100 is supplied by a pressurizing pump 105 provided outside, and the air pressure can be adjusted by an open / close valve 107 provided in the supply path 106.

  Thus, since the air pressure can be adjusted, the urging force of the impact damper 150 can be freely changed, and when not in use, the impact damper 150 is accommodated in the die plate 33 by removing the air. be able to.

Thus, in this embodiment, the urging force of the impact damper 150 is given by the air spring 100.
Thereby, the urging force can be adjusted by adjusting the air pressure. Further, when not in use, the impact damper 50 can be prevented from being exposed on the die plate 33 at all.
Therefore, the impact relaxation function of the impact damper 50 can be freely changed, and a more detailed impact relaxation function can be exhibited.

  Note that, as in this embodiment, the air may not always be supplied from the outside, but the air may always be sealed inside.

  Further, when the supply passage of the air spring 100 of each impact damper 150 is communicated, the urging force of all the impact dampers 150 becomes uniform, and the impact of the stripper plate 28 can be stably absorbed.

  Other functions and effects are the same as those in the first embodiment.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment,
The damper member of the present invention corresponds to the impact dampers 50 and 150,
Similarly,
The elastic means corresponds to the coil spring 54 and the air spring 100,
The present invention is not limited to the above-described embodiment, but includes embodiments applied to all press working apparatuses and press methods.
In particular, the elastic means is not particularly limited as long as it generates an urging force other than the coil spring and the air spring.
Further, the number of impact dampers and the installation positions may be installed in any place as long as they are not on the workpiece transfer path.
Further, it is conceivable to elastically support the entire die plate, but it is desirable that the die plate itself is firmly fixed to the apparatus in order to process the workpiece with high accuracy.

Schematic of the press process including the high-speed press processing apparatus of 1st embodiment. Mold structure used in press working equipment. The detailed perspective view which notched the lower mold unit partially. Detailed sectional drawing of a lower mold unit. Explanatory drawing of the press operation | movement of this embodiment. Explanatory drawing of the press operation | movement of a conventional structure. FIG. 5 is a detailed cross-sectional view of another embodiment corresponding to FIG. 4.

DESCRIPTION OF SYMBOLS 1 ... High-speed press processing apparatus 20 ... Upper die 28 ... Stripper plate 30 ... Lower die 33 ... Die plate 50 ... Impact damper 53 ... Contact rod member 54 ... Coil spring 100 ... Air spring 150 ... Impact damper 153 ... Contact rod member

Claims (6)

A press working apparatus comprising an upper mold reciprocating in the vertical direction and a lower mold fixed to the apparatus, and provided with a stripper plate biased downward via an elastic member on the upper mold,
In the lower mold, a die plate is installed at a position facing the stripper plate,
The die plate is provided with a damper member that is urged upward by elastic means, and that the stripper plate comes into contact with the die plate in the middle of lowering and sinks into the die plate when it comes into contact. apparatus. The press working apparatus according to claim 1, wherein the biasing force of the elastic means of the damper member is set lower than the biasing force of the elastic member of the stripper plate. The press working apparatus according to claim 1 or 2, wherein a plurality of the damper members are provided. The press working apparatus according to any one of claims 1 to 3, wherein the elastic means of the damper member is a coil spring. The press working apparatus according to any one of claims 1 to 3, wherein the elastic means of the damper member is an air spring. A press method for pressing a workpiece by combining an upper die that reciprocates in a vertical direction with respect to a lower die fixed to the apparatus,
When lowering the upper mold, a stripper plate provided via an elastic member to the upper mold, before the said die plate in the middle drop damper member provided retractably in the die plate was set in the lower die An impact mitigation step to abut,
And a work holding step of holding the work by bringing the stripper plate into contact with the die plate after the impact relaxation step.

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