JP2007275955A - Press machine and compound device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve downsizing and electric power saving of a press machine by using a speed reduction mechanism 5 capable of efficiently amplifying and transmitting the rotational driving power of a servo-motor 12. <P>SOLUTION: The rotational driving power of the servo-motor 12 is converted by an eccentric shaft 37 to an eccentric rotational driving power which is transmitted to an external tooth gear 36. A regulating pin 40 is fitted to the external tooth gear 36 and the other end thereof is loosely fitted to a pin free fitting hole 42 formed at a flange 21 to regulate the rotation of the external tooth gear 36. Also, when the external tooth gear 36 is off-centered, an internal tooth gear 35 which partially engages with the external tooth gear 36 in the off-centered direction is provided. A ball screw shaft 14a is connected to the internal tooth gear 35 and a ball screw to convert and transmit the rotational motion of the internal tooth gear 35 to the translation motion of a ram 13 is provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pressing machine that amplifies rotational power output from a power generation source (decelerates the rotational speed) and presses or cuts a metal plate or the like, and a composite apparatus using the same.

  Conventionally, a press machine using a servo motor as a power generation source has been proposed. In such a press machine, workpieces are machined by amplifying the rotational power of the servo motor using a reduction mechanism and transmitting it to a die. ing. As a reduction mechanism used in such a press machine, various configurations have been known, and a proposal using a planetary gear mechanism that is compact and can obtain a large reduction ratio has been made (see Patent Document 1).

  In the press machine disclosed in Patent Document 1, a sun gear is fixed to a motor shaft, and three planetary gears mesh with the sun gear. The relative position between the planetary gears is regulated and connected to the output shaft, and an internal gear fixed so as to enclose each planetary gear is provided, and each planetary gear is connected to the internal gear. It has a combined configuration.

  However, although the planetary gear mechanism according to Patent Document 1 has an advantage that a large reduction ratio can be easily obtained, the number of components is increased and the sun gear, the planetary gear, and the internal gear are a so-called spur gear. Similarly, since the toothed portion slides, there is a problem that a large frictional force is generated and the power transmission efficiency is poor.

  In addition, if the power transmission efficiency is low, a servo motor having a large capacity must be used, which causes a problem of increasing the device cost and power consumption.

  On the other hand, in parts used for various devices, products formed by integrating a plurality of parts having different manufacturing processes and materials, such as metal and resin, may be used. For example, a composite molding machine has been proposed in which parts are manufactured by pressing or cutting with a press machine, and resin molding is performed on the parts using an injection molding machine or the like (see Patent Document 2).

However, although a conceptual proposal has been made in the composite molding machine according to Patent Document 2, a specific configuration of a speed reduction mechanism used in a press machine or an injection molding machine is not disclosed, as in Patent Document 1 above. If such a known speed reduction mechanism is used, each apparatus becomes large, and there is a problem that it is difficult to supply the part while introducing the composite molding machine to the production line and manufacturing the part.
JP 2004-243377 A JP-A-8-183103

  The present invention has been made in view of such circumstances, and provides a press machine that achieves downsizing and power saving of the apparatus using a reduction mechanism that can amplify and transmit the rotational power of a power source in a compact and efficient manner. In addition, an object of the present invention is to provide a compact composite apparatus using the press.

  In order to solve the above-mentioned problems, an invention relating to a press machine is a press machine provided with a speed reduction mechanism that reduces the rotation speed of a servo motor and transmits it to a ram, and the speed reduction mechanism eccentrically distributes the rotational power of the servo motor. An eccentric shaft that converts to rotational power, a first gear that moves eccentrically when eccentric rotational power is transmitted from the eccentric shaft, and the rotational motion of the first gear is restricted while allowing the eccentric motion. A speed reduction mechanism comprising: a regulating pin that rotates, and a second gear that partially meshes with the first gear in the eccentric direction of the first gear and rotates in response to rotation in the eccentric direction; And a propulsion power conversion mechanism that converts rotational power into propulsion power and transmits the propulsion power to the ram.

  Further, the propulsion power conversion mechanism is a ball screw, and one of the ball screw shaft or the ball screw nut is connected to the second gear, and the remaining ball screw nut or ball screw is connected to the ram.

  Further, one of the molds that opens and closes the mold is attached to the ram, and an alignment portion that defines an attachment position is formed on an attachment surface between the mold and the ram.

  In addition, the invention relating to the composite apparatus includes a press machine according to any one of claims 1 to 3 that manufactures a first product by press-working a workpiece, and the first product provided in parallel with the press machine. And a secondary manufacturing apparatus that produces a second product by processing and molding, and a slide mechanism that moves one or both of the secondary manufacturing apparatus and the pressing machine in the parallel arrangement direction thereof. To do.

  The secondary manufacturing apparatus is an injection molding machine for injection molding of resin.

  According to the present invention, since the press machine is configured by using a reduction mechanism that is small and can efficiently amplify and transmit rotational power, the press machine can be miniaturized and can be used, for example, on a desk. Since the power transmission efficiency of the speed reduction mechanism is high, it is possible to save power.

  Further, since the composite apparatus is configured by a small press machine, the composite apparatus can be miniaturized and introduced into the production line.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external view of a press 4 according to the present invention, FIG. 1 (a) is a front view, and FIG. 1 (b) is a side view. FIG. 2 is a cross-sectional view taken along arrow AA in FIG. FIG. 3 is an exploded cross-sectional perspective view showing the configuration of the speed reduction mechanism 5.

  In this embodiment, a press machine for processing and forming a workpiece such as a metal plate will be described as an example of the press machine 4. However, the present invention is not limited to such a press machine and performs a cutting process or the like. It may be.

  In this embodiment, a ball screw is described as an example of the propulsion power conversion mechanism. However, a screw rod and a nut screwed to the screw rod may be used, or a configuration using a cam, a link, or the like may be used.

  In the press machine 4 for processing and molding a material, a pair of press dies 18 (18a, 18b) is used. A workpiece is inserted between the press dies 18a and 18b and the press dies 18 are inserted. The molding is performed by clamping the mold.

  The press machine 4 according to the present invention is provided with a main body frame 11 that makes an appearance, a servo motor 12 that forms a power generation source, a speed reduction mechanism 5 that amplifies and transmits the rotational power of the servo motor 12, and one press mold 18a. The main components are a ram 13, a ball screw 14 that converts rotational power from the speed reduction mechanism 5 into translational motion and transmits it to the ram 13, a diver 15 that guides the vertical motion of the ram 13 and restricts its rotation.

  The main body frame 11 includes a top frame 16 to which the servo motor 12 is attached and the speed reduction mechanism 5 is accommodated therein, and a base frame 17 to which the other press die 18b is attached. The top frame 16 and the base frame 17 are the main frames. The structure is such that the pillar walls 23 face each other at a predetermined interval.

  In addition, a speed reduction mechanism housing portion 19 for housing the speed reduction mechanism 5 is formed at the center of the top frame 16, and a diver insertion hole 20 through which the diver 15 is inserted is provided on the left and right sides thereof. The speed reduction mechanism housing portion 19 is covered with a flange (position fixing member) 21, and a diver insertion hole 20 is provided with a bearing 22 that guides the vertical movement of the diver 15.

  A head portion 14c of the ball screw shaft 14a in the ball screw 14 is cut to form a rotation stopper, and is connected to an internal gear (second gear) 35 described later. The ball screw nut 14 b is bolted to the ram 13.

  5A and 5B are diagrams showing the configuration of the ram 13, FIG. 5A is a perspective view, and FIG. 5B is a cross-sectional view taken along the line BB in FIG. 5A. FIG. 5A also shows a press die 18 a attached to the ram 13.

A shaft hole 24 through which the ball screw shaft 14a is inserted and a cross-shaped alignment projection 25 are provided at the center of the ram 13, and a diver insertion hole 26 into which one end of the diver 15 is inserted and the diver 15 are bolted to the left and right. For this purpose, a diver bolt hole 27 is provided. In addition, a plurality of die attaching female screws 29 for attaching the press die 18a by bolting are formed.
The press mold 18a is formed with a positioning groove 30 that fits with the positioning protrusion 25 and a fitting hole 31 through which a bolt that is screwed into the female screw 29 for fitting the mold is inserted. Yes.

As shown in FIG. 3, the speed reduction mechanism 5 includes one internal gear 35, and one external gear (first gear) 36 is disposed on the inside thereof, and the external gear 36 is eccentric. The shaft 37 is connected to the motor shaft 38 of the servo motor 12 through the shaft 37.
Further, the external gear 36 is provided with a plurality of pin holes 39, and one end of the restriction pin 40 is inserted into the pin hole 39. The other end of the restriction pin 40 is loosely fitted in a pin loose-fit hole 42 formed in the flange 21.

  A through hole 45 through which a bolt 44 for connecting the internal gear 35 and the ball screw shaft 14a is inserted is provided at the center of the internal gear 35, and a head 14c of the ball screw shaft 14a is fitted. A hole 46 is provided. The fitting hole 46 is formed to have the same shape as the head 14 c (for example, D-cut) of the ball screw 14, and the rotational movement of the internal gear 35 is transmitted to the ball screw 14. ing.

  Further, a bearing B <b> 1 is interposed between the eccentric shaft 37 and the flange 21, and a bearing B <b> 2 is interposed between the eccentric shaft 37 and the external gear 36. Further, bearings B3 and B4 are provided on the outer periphery of the internal gear 35.

  FIG. 4 is a diagram for explaining the operation of the speed reduction mechanism 5 having such a configuration. The rotational power of the servo motor 12 is transmitted to the external gear 36 via the eccentric shaft 37. The external gear 36 tries to rotate while being eccentric following the eccentric movement of the eccentric shaft 37, but one end of the regulation pin 40 is accommodated in a pin loose fitting hole 42 formed in the flange 21. Therefore, the rotation is restricted, and as a result, the eccentric direction changes (rotates).

  When the external gear 36 performs such eccentric movement that rotates in the eccentric direction, the external gear 36 and the internal gear 35 partially mesh with each other in the eccentric direction, and the teeth of the other parts are It becomes a separated state. This gearing portion rotates according to the eccentric direction, and this rotation is transmitted as rotation of the internal gear 35. Since the number of teeth of the external gear 36 is smaller than the number of teeth of the internal gear 35, the rotational speed of the servo motor 12 can be reduced and transmitted to the internal gear 35 in accordance with the fractional difference.

As described above, since the speed reduction mechanism constituted by one internal gear 35 and one external gear 36 is used, the press machine can be miniaturized.
Further, since the internal gear 35 is directly connected to the ball screw shaft 14a, the size can be reduced as compared with a configuration in which, for example, a joint is provided.
Further, the tooth shapes of the external gear 36 and the internal gear 35 are generally arc-shaped and are designed so that the sliding of the toothed portion does not occur. There is no inconvenience that the transmission efficiency decreases.

  In such a configuration, when the servo motor 12 is rotated, the rotation is decelerated via the eccentric shaft 37 and the external gear 36 and transmitted to the internal gear 35 and connected to the internal gear 35. The ball screw 14 rotates. Since the ball screw nut 14 b screwed with the ball screw 14 is fixed to the ram 13, the ram 13 moves up and down while being guided by the diver 15 according to the rotation direction of the servo motor 12.

  Since the press mold 18a is fixed to the ram 13 and the press mold 18b is fixed to the base frame 17, the work between the press mold 18a and the press mold 18b is processed when the ram 13 descends. can do.

  In the above description, the first gear is the external gear and the second gear is the internal gear, and the rotational power of the internal gear is extracted. However, the rotational power may be extracted from the external gear. Good. However, in this case, it is necessary to form a pin loose-fitting hole in which the regulation pin loosely fits on the output side such as a ball screw shaft or a ball screw nut.

  Next, a second embodiment of the present invention will be described. The present embodiment relates to a composite apparatus. The above-described press machine 4 is used, and the composite apparatus is configured by an apparatus that further processes parts manufactured by the press machine 4.

  Specifically, the case where two press machines 4a and 4b are used and an injection molding machine is provided between them will be described as an example. Of course, the present invention does not require the use of an injection molding machine, nor does it require the use of two press machines. In short, the present invention relates to a composite apparatus configured by combining the above press machine and another apparatus.

  FIG. 6 is a diagram for explaining the schematic configuration and operation of such a composite apparatus 50. In the composite apparatus 50, press machines 4a and 4b are disposed on the left and right adjacent to the injection molding machine 6, and each press machine 4a, 4b is provided with a slide mechanism 51 so that it can move in the direction of juxtaposition with the injection molding machine 6.

FIG. 6A shows products formed by the press machines 4a and 4b and the injection molding machine 6. The primary product S1 is formed by the press machine 4a, and the injection molded product S2 is the primary product S1. On the other hand, the injection molding machine 6 is formed by injection molding of resin, and the finished product S3 is a part completed by separating the injection molding product S2 from the workpiece W by the press machine 4b.
Moreover, FIG.6 (b)-FIG.6 (d) have shown each manufacturing process procedure.

  The slide mechanism 51 is provided for the purpose of adjusting the time difference by the movement of each press 4 because the injection molding time by the injection molding machine 6 requires a longer time than the processing molding time by the press 4. It comprises a guide part 52 for guiding the moving direction of each press 4 and a moving part 53 for moving the press 4.

  The guide portion 52 includes a guide hole 54 (see FIG. 1B) provided in the press 4 and a guide bar 55 that is inserted into the guide hole 54 and fixed to the table K or the like and supported by the support base 60. ing.

The moving portion 53 includes a female screw portion 56 provided in the press 4, a screw rod 57 that is screwed into the female screw portion 56, a motor 58 such as a servo motor that rotates the screw rod 57, and the like. 57 is rotatably supported by a support base 60. In addition, you may comprise the internal thread part 56 and the screw rod 57 with a ball screw.
The guide rod 55 and the screw rod 57 penetrate the injection molding machine 6, and the injection molding machine 6 is fixed to the table K.

  As shown in FIG. 7, the injection molding machine 6 has a mold clamping part 64 for opening and closing the injection mold 63, a plasticizing part 65 for plasticizing the resin, and a predetermined amount of plasticized resin in the cavity of the injection mold 63. A metering injection unit 66 and the like for measuring and injecting are provided.

With such a configuration, the press machine 4a processes and forms the workpiece W to manufacture the primary product S1.
In the present embodiment, a cylindrical insert part is illustrated as the primary product S1. This insert part is connected to the workpiece W main body via a connection portion 59. Therefore, by maintaining the workpiece W in a predetermined posture (for example, in a horizontal state), the posture of the insert part is also regulated, and can always be supplied to the injection molding machine 6 in the same posture.

  When the primary product S1 is manufactured by the press machine 4a, the left and right press machines 4 grip the workpiece W, and the left and right press machines 4 move in the direction D1 in which the press machine 4a approaches the injection molding machine 6 by the moving unit 53. The primary product S1 is supplied to the injection molding machine 6 by moving a predetermined amount (see FIG. 6B).

When the supply of the primary product S1 is completed and the injection molding machine 6 grips the workpiece to produce the injection molded product S2, the left and right press machines 4 release the workpiece W and move in the direction D2 (FIG. 6 (c). )reference).
When the left and right press machines 4 move in the direction D2 by a certain amount, the movement stops (see FIG. 6D), and the injection molded product S2 manufactured by the injection molding machine 6 is supplied to the press machine 4b. Be done

  When the primary product S1 is delivered to the injection molding machine 6, the injection molding machine 6 injects resin to the primary product S1 to produce an injection molded product S2 having a predetermined shape.

  On the other hand, the press machine 4b supplied with the injection molded product S2 from the injection molding machine 6 cuts the connecting portion 59 connecting the injection molded product S2 and the workpiece W, and takes out the finished product S3. It is post-processed and supplied to a production line or the like.

  As a matter of course, various devices are arranged in the production line, and from the viewpoint of production efficiency and work efficiency, downsizing of the device is required, and a large reduction ratio is achieved with one reduction mechanism as in the present invention. Since the power is transmitted efficiently in the city, the total length and height of the composite device 50 are reduced, so that productivity and workability can be improved.

It is the front view and side view of the press which concern on this invention. It is sectional drawing of a press machine. It is a disassembled cross-sectional perspective view of a deceleration mechanism. It is a figure applied to description of operation | movement of a deceleration mechanism. It is a figure which shows the structure of a ram. It is a figure explaining the manufacturing process of a compound apparatus. It is a front view of an injection molding equipment.

Explanation of symbols

4 (4a, 4b) Press machine 5 Reduction mechanism 6 Injection molding machine 11 Body frame 12 Servo motor 13 Ram 14 Ball screw (propulsion power conversion mechanism)
14a Ball screw shaft (propulsion power conversion mechanism)
14b Ball screw nut (propulsion power conversion mechanism)
15 Diver 16 Top frame 17 Base frame 18 (18a, 18b) Press die 19 Reduction mechanism storage part 20 Diver insertion hole 21 Flange (position fixing member)
22 Bearing 23 Main pillar wall 24 Shaft hole 25 Alignment projection 26 Diver insertion hole 27 Diver bolt hole 29 Female screw for mold attachment 30 Alignment groove 31 Insertion hole 35 Internal gear (second gear)
36 External gear (first gear)
37 Eccentric shaft 38 Motor shaft 39 Pin hole 40 Restriction pin 42 Pin loose fitting hole 44 Bolt 45 Through hole 46 Fitting hole 50 Compound device 51 Slide mechanism 52 Guide portion 53 Moving portion 54 Guide hole 55 Guide rod 56 Female screw portion 57 Screw rod 58 Motor 59 Connection part 60 Support base 63 Injection mold 64 Mold clamping part 65 Plasticizing part 66 Metering injection part

Claims (5)

A press machine equipped with a speed reduction mechanism that reduces the rotation speed of the servo motor and transmits it to the ram,
The speed reduction mechanism includes an eccentric shaft that converts rotational power of the servo motor into eccentric rotational power, a first gear that is eccentrically moved by the eccentric rotational power transmitted from the eccentric shaft, A regulation pin that regulates the rotation motion while allowing the eccentric motion of the first gear, and a portion that meshes with the first gear in the eccentric direction of the first gear and rotates according to the rotation in the eccentric direction. A second speed reduction mechanism,
A press machine comprising: a propulsion power conversion mechanism that converts rotational power of the second gear into propulsion power and transmits the propulsion power to the ram.   The propulsion power conversion mechanism is a ball screw, and one of its ball screw shaft or ball screw nut is connected to the second gear, and the remaining ball screw nut or ball screw is connected to the ram. The press according to 1.   3. The press according to claim 1, wherein one of the molds that opens and closes the mold is attached to the ram, and an alignment portion that defines an attachment position is formed on an attachment surface between the mold and the ram. Machine. The press machine according to any one of claims 1 to 3, wherein the first product is manufactured by press-working a workpiece;
A secondary manufacturing apparatus that is provided side by side with the pressing machine and that manufactures a second product by processing and molding the first product;
A composite apparatus comprising: a slide mechanism that moves either one or both of the secondary manufacturing apparatus and the press machine in a parallel arrangement direction thereof.   The composite apparatus according to claim 4, wherein the secondary manufacturing apparatus is an injection molding machine that performs injection molding of resin.