JP2005118792A - Pressing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressing device where working speed and the number of strokes are high, consumption energy is reduced, the working speed, the number of strokes and the output of a press can optionally be set, further, the parallelism of a slide is satisfactory, nevertheless, the total height can be reduced, and production and maintenance are easy. <P>SOLUTION: To a crown facing a bed, a slide is arranged freely ascendable and descendable. The bed side is provided with a rotary axis having a left-hand thread and a right-hand thread and a motor driving the same. Further, in the parts corresponding to the left-hand thread part and the right-hand thread part, left and right traverse bodies translated by their rotation are installed. Each traverse body, the lower part of the slide and the bed are respectively connected by link mechanisms. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a press apparatus used for various types of processing of metal and non-metal materials.

  A press is widely used as a means for plastic working a metal and a non-metallic material. As such a press, a flywheel is used, energy is accumulated during the ascending and descending strokes of the slide, and the accumulated energy is output by decelerating the rotational speed of the flywheel during the machining stroke and connected to the crankshaft arm. The crank type drive system that moves the slide down to process the workpiece and the drive energy of the motor is transmitted to the hydraulic cylinder via hydraulic equipment (hydraulic circuit) such as a hydraulic pump and relief, and the ram-coupled slide of the hydraulic cylinder There is a hydraulic drive type that moves down and processes the workpiece.

  Compared to the latter, the former is characterized by higher machining speed and number of strokes and less consumption energy, but because it is driven using inertial energy, the press working force, machining speed and stroke position can be set arbitrarily. There was a problem that I could not.

  On the other hand, the latter has the advantage that the press working speed and stroke can be set arbitrarily, and the press output can also be set arbitrarily, but the number of strokes per hour cannot be increased, so the speed is increased. It was difficult to realize. In addition, using a pump, the pressure oil discharged from the pump is controlled by a relief valve to control the output of the press, and the speed is controlled by a throttle valve. The consumed drive energy becomes heat, and the stability of the hydraulic system is lowered, and a cooling device needs to be additionally installed, resulting in an increase in size. Furthermore, since the pressure oil is supplied to the head side and the piston side to raise and lower the slide, there is a disadvantage that a large capacity large cylinder is required to increase the processing capability.

  As such countermeasure, the applicant of the present invention disclosed in Japanese Patent Application Laid-Open No. 2001-300778 that the screw shaft is suspended from the crown to the press room and is driven by a servo motor / reduction gear installed on the crown. We proposed a link-type servo press in which a lifting body including a nut was attached in the middle, and the crown and slide were connected by a link mechanism, which made it possible to eliminate the disadvantages of the crank-type drive device and the hydraulic drive device.

However, in the prior art, the length of the screw shaft attached to the crown in the vertical direction affects the height of the press, and as the slide stroke becomes longer, the screw shaft becomes longer, which increases the overall height of the press. There was a problem that it might become impossible to install in the factory.
In addition, the weight of the link mechanism and the slide is directly applied to the screw of the screw shaft, and the screw shaft and its drive motor must be assembled at a high place, so that the workability of press production is deteriorated. This was especially true because the shaft and its drive motors were also large. In addition, there is a problem that maintenance is poor because the crown part must be climbed one by one.

The present invention has been made in order to eliminate the above-described conventional problems, and the object of the present invention is that the machining speed and the number of strokes are high, the consumption energy is small, and the machining speed, stroke and press output are reduced. An object of the present invention is to provide a pressing device that can be set arbitrarily, and that the balance of the slide is good, the overall height can be lowered, and the manufacture and maintenance are easy.
The present invention is suitable for fine blanking, progressive press and the like, but is not limited thereto.

  In order to achieve the above object, the present invention provides a slide which can be moved up and down with respect to a crown facing the bed, and has a motor, a left screw portion and a right screw portion on the bed side and is driven by the motor. Left and right traversing bodies that are translated by these rotations are installed at the portions corresponding to the left and right screw portions, and the link mechanism between each traversing body, the lower slide portion, and the bed. It is characterized by being connected by.

  According to the present invention, the motor 3 having a small capacity can be used in plastic working such as punching and drawing due to the energy effects of increasing speed during lowering and rising and increasing force during pressurization by the symmetrical link mechanisms 8 and 8 '. Thus, it is possible to obtain a larger machining capacity and simultaneously drive the slide at a high speed, thereby increasing the number of strokes per minute. In addition, there is a pair of left and right link mechanisms, which are connected to the lower left and right positions of the slide 1e, and perform synchronous elevation by translation of the left and right traversing bodies by the rotation of the left and right screws, so that the slide balance accuracy can be improved. Thus, a high-performance, high-precision, energy-saving press can be achieved.

  Moreover, it is a simple servo link drive system of an underdrive type that raises and pressurizes the slide from the bottom, and has a low motor and a rotating shaft and a traversing body that convert the rotational energy of the motor as a drive source thereof. Since it is installed horizontally at the position, the overall height of the press is lowered, and the assembly workability is improved. In addition, excellent effects such as easy maintenance and replacement of parts at a position as low as the bed can be obtained.

A first shaft having a left-hand thread portion and a second shaft having a right-hand thread portion are connected by a joint and are driven by a single motor.
According to this configuration, since the number of motors is one, an effect that costs are reduced can be obtained.
Instead, the first shaft having the left screw portion and the second shaft having the right screw portion may be driven by different motors.
According to this, it is possible to obtain an effect of finely adjusting the balance of the slide.

A numerical control type motor is used. As a result, the pressurization and holding performance by the control characteristics of the rotational speed and speed can be combined, so that a higher-performance press can be obtained.
The link mechanism includes a triangular link having one vertex pivotally supported by the bed-side support, a link pivotally supported by the second vertex of the link and the other end pivotally supported by the lower slide, 3 and a link pivotally supported at the apex of 3 and pivotally supported at the front end of the traversing body.
As a result, the structure of the link mechanism is simple, and an excellent effect that the slide underdrive can be reliably performed is obtained.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows an embodiment of a press apparatus according to the present invention.
Reference numeral 1 denotes a press frame, in which columns 1b are erected at four corners of a bed 1a, a crown (column head) 1c is rigidly connected to the upper portion of the column 1b, and gibbs 1f and 1f are provided on the columns 1b and 1b. A slide 1e on which a mold K is attached via a table is slidably attached to the give. On the lower surface of the crown 1c, a base 1g for mounting a mold K ′ that forms a pair with the mold of the slide 1e is fixed.

  Reference numerals 2 and 2 ′ are bases that extend to the side of the bed 1 a or are provided side by side. A general-purpose or numerically controlled motor (for example, an AC servomotor) 3 is installed on one base 2. The speed reducer 4 is connected to the output shaft, and the rotating shaft (first rotating shaft) 5 is connected to the output side of the speed reducer 4 in parallel with the upper surface of the bed. A bearing 4 'is installed on the other base 2', and a rotating shaft (second rotating shaft) 5 'is connected to the bearing 4' in parallel with the upper surface of the bed.

  The rotary shafts 5 and 5 'are coaxial and are connected by a joint 5a near the center line of the frame, and one rotary shaft 5 is provided with a male screw (for example, a left ball screw) 50 over a required range. The other rotating shaft 5 'is provided with a male screw (for example, a right ball screw) 50' opposite to the male screw over a required range.

Reference numerals 6 and 6 ′ are a set of block-like traversing bodies on the left and right sides, which are slidably attached to the bases 2 and 2 ′ or guides 6a and 6a ′ fixed to the bed 1a.
The traversing bodies 6 and 6 ′ have holes through which the rotary shafts 5 and 5 ′ pass, respectively, and nuts 7 and 7 ′ are fixed. The male screws 50 and 50 ′ are screwed into the nuts 7 and 7 ′. Has been.

8 and 8 'are bilaterally symmetric link mechanisms for converting and amplifying the output of the traversing bodies 6 and 6' from the horizontal direction to the vertical direction and transmitting them to the slide 1e, between the left and right areas of the bed 1a and the slide 1e It is arranged in the space.
Each link mechanism 8, 8 'includes a triangular link 8a configured by assembling plates or levers, and first and second links 8b, 8c having two lever shapes.

The triangular link 8a is pivotally attached to the left and right side supports 9, 9 ′ provided with one apex 80 being biased to the left and right sides on the bed, and the other two apexes 81 are provided. , 82 are pivotally attached to the lower end portion of the first link 8b and the upper end portion of the second link 8c by pins or the like. The upper end portion of the first link 8b is pivotally attached to a bracket-like support portion (may be a hole formed in the lower portion of the slide) 10, 10 ′ protruding from the lower end portion of the slide 1e with a pin or the like, The lower end portion of the second link 8c is pivotally attached to the tip end portion of the traversing bodies 6 and 6 ′ by a pin or the like.
The link mechanisms 8 and 8 ′ may be configured by arranging two sets of triangular links 8a and first and second links 8b and 8c in the front-rear direction with respect to the paper surface.

In addition, what is shown in figure is an example of this invention and is not limited to this.
1) The drive motor 3 and the speed reducer 4 may be installed in the vicinity of the joint 5a, and the rotary shafts 5 and 5 'may be driven through the joint 5a. In this case, the end of the left rotating shaft 5 is supported by the bearing.
2) In the embodiment of FIG. 1, the rotation axes 5 and 5 ′ may be a single series of axes. In this case, the joint 5a is changed to an intermediate bearing to support the rotating shaft.
3) Further, in the drawing, the motor 3 and the speed reducer 4 are connected to the right rotating shaft 5 ′ in the same manner as the left rotating shaft 5, and the left and right rotating shafts 5, 5 ′ are respectively connected by the left and right motors. You may make it drive. According to this, the balance accuracy of the slide is improved by the synchronous drive, and the balance can be maintained by adjusting the drive amount on one side when the press eccentric load is generated.

The operation in the embodiment will be described. FIG. 2 shows a state in which the slide 1e is at the lower limit position, FIG. 3 shows a state in the intermediate position, and FIG. 4 shows a state in the upper limit position.
When the motor 3 is driven from the state of FIG. 2, the rotational energy is transmitted to the rotary shaft 55 via the speed reducer 4, and the rotary shaft 5 ′ connected thereto by the joint 5a also rotates synchronously.
Since the left and right rotating shafts 5 and 5 'are provided with reverse screws 50 and 50', the nuts 7 and 7 'and the traversing bodies 6 and 6' integrated therewith are horizontally symmetrical. Perform a linear motion. Further, the output is amplified via the symmetrical link mechanisms 8 and 8 'connected to the traversing bodies 6 and 6', and the vertical output is transmitted to the slide 1e.

  That is, when the rotation shafts 5 and 5 ′ rotate and the base ends 83 and 83 of the traversing bodies 6 and 6 ′ and the second links 8c of the symmetric link mechanisms 8 and 8 ′ move in the right and left directions, The shape links 8a and 8a pivot around the pivot points 80 and 80 of the supports 9 and 9 'as shown by the left and right arrows in FIG. At the same time, energy is transmitted to the first links 8b and 8b, the pivot points 84 and 84 of the support portions 10 and 10 'and the slide 1e are raised, and an upward output is generated toward the crown 1c. The plastic working is performed. Further, when the traversing bodies 6 and 6 'and the base ends 83 and 83 of the second links 8c and 8c move leftward and rightward, the slide 1e is lowered.

When the motor 3 rotates from the lower limit position in FIG. 2 to move the left and right traversing bodies 6 and 6 ′ to the right by the stroke of A1, the triangular links 8a and 8a are turned accordingly. The left and right first links 8b and 8b connected to the apex of the swivel swivel so that the angle α1 formed with the vertical line changes to α2, respectively. As a result, the guided slide 1e is moved from the lower limit position. The triangular links 8a and 8a are lifted by the stroke B1 of the inclination angle β1.
When the traversing bodies 6, 6 'further advance to the right and left by the stroke of A2, the angle of the first links 8b, 8b becomes α3, and only the stroke B2 of the inclination angle β2 of the triangular links 8a, 8a compared to the lower limit. The slide 1e reaches the upper limit position of FIG. 4, and a workpiece (not shown) is pressed and plastically processed by the mold K of the slide 1e and the mold K ′ of the crown 1c.

If the motor 3 is reversed when the machining process is completed, the traversing bodies 6 and 6 ′ are retracted by the reverse rotation of the rotating shafts 5 and 5 ′, and the slide 1e is moved from the state of FIG. 4 to the state of FIG. It returns to the lower limit position. Thereafter, by repeating forward and reverse rotations of the motor 3, the slide 1e is continuously linearly reciprocated via the left and right link mechanisms 8, 8 ′, and continuous machining is performed.
Since the slide 1e is lifted and lowered by the bending and stretching of the link mechanisms 8 and 8 'while being supported by the link mechanisms 8 and 8' on the lower left and right, a good balance can be maintained throughout.

  When the numerical control type motor 3 is used as the motor 3, the pressure at the slide upper limit position can be held freely and reliably, and the stroke, speed and pressurization can be controlled freely. Since the minimum stroke suitable for the molding conditions can be set, the number of strokes can be improved. Further, the pressure at the bottom dead center or in the vicinity thereof can be freely held by cooperation with the left and right link mechanisms 8 and 8 ', so that it is easy to cope with the spring back. For drawing, punching, and cold forging, it is possible to configure a high-performance press because optimum control is possible according to the characteristics of each process.

It is a side view which shows an example of the press apparatus by this invention in the state of a minimum position. It is explanatory drawing which shows the state of a minimum position. It is explanatory drawing which shows the state of an intermediate position. It is explanatory drawing which shows the state of an upper limit position.

Explanation of symbols

1a Bed 1c Crown 1e Slide 3 Motor 5, 5 ′ Rotating shaft 6, 6 ′ Traversing body 7, 7 ′ Nut 8, 8 ′ Link mechanism 8a Triangular link 8b, 8c First and second links

Claims (5)

  The slide is arranged so as to be able to move up and down with respect to the crown facing the bed. On the bed side, a motor, a left screw portion and a right screw portion are provided, and a rotary shaft driven by the motor is horizontally mounted. The right and left traversing bodies that are translated by these rotations are installed in the portions corresponding to the head portion and the right screw portion, and the traversing body, the slide lower portion, and the bed are connected by a link mechanism, respectively. .   The press apparatus according to claim 1, wherein the first shaft having a left-hand thread portion and the second shaft having a right-hand thread portion are connected by a joint and are driven by a single motor.   The press apparatus according to claim 1, wherein the first shaft having a left-hand thread portion and the second shaft having a right-hand thread portion are driven by different motors.   4. The press apparatus according to claim 1, wherein the motor is a numerical control type motor.   The link mechanism includes a triangular link having one vertex pivotally supported by the bed-side support, a link pivotally supported by the second vertex of the link and the other end pivotally supported by the lower slide, The press apparatus according to claim 1, further comprising: a link pivotally supported at the apex of 3 and the other end pivotally supported at the front end of the traversing body.

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