JP2004066319A - Pressing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press machine of structurally simple design capable of arbitrarily changing the reciprocative motion of a slide. <P>SOLUTION: A driving force generating part 7 is a disk servomotor having a rotator 7a rotating in a flat face and a fixed body 7b for rotatably supporting this rotator 7a. The driving force generating part 7 is fixed to a top plate 6 such that the central axis line C<SB>0</SB>of the slide 4 and the rotation axis line C<SB>1</SB>of the rotator 7a are separated by an offset quantity δ. A driving force transmitting part 8 is equipped with a connecting member 8a for connecting the rotator 7a and the slide 4 and the like so that the slide 4 reciprocatively moves corresponding to the rotary motion of the rotator 7a. A driving force controlling part 10 changes the angular velocity of the rotator 7a in one reciprocative motion of the slide 4, and makes the rotator 7a execute uniform circular motion or a part of this uniform circular motion execute reciprocative arcuate motion based on the output signal from a rotation detection part 9. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a press machine provided with a drive mechanism that converts a rotation operation of a servomotor into a linear movement of a slide.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a press machine having a drive mechanism for converting a rotational movement of a servomotor into a linear movement of a slide. For example, Japanese Patent Application Laid-Open No. 2000-343283 discloses a press machine (prior art 1) that converts a rotation operation of a servomotor into a reciprocating operation of a slide by a screw mechanism. Japanese Patent Application Laid-Open No. 2001-62591 discloses a press machine (prior art 2) that converts the rotation operation of a servomotor into a reciprocating slide operation by a crank mechanism. Japanese Patent Application Laid-Open No. 2001-150190 discloses a press machine (prior art 3) that converts a rotation operation of a servo motor into a lifting operation of a slide by a lever mechanism. Japanese Patent Application Laid-Open No. 2000-237897 discloses a press machine (prior art 4) that converts a rotation operation of a servomotor into a reciprocating operation of a slide by a toggle mechanism. The prior art 1 has a small number of components of the press machine and is high in accuracy but has a low reduction ratio, while the prior art 2 is inexpensive but small in the case of a small machine, and has a low reduction ratio in the prior arts 3 and 4. However, there is a problem in that the number of components increases, and in the case of a small machine, the cost increases. In particular, the prior art 1 has a fixed reduction ratio unlike the prior arts 2 to 4 in which the reduction ratio changes, and therefore has a problem that the capacity of the servomotor becomes 3 to 5 times or more as compared with the prior arts 2 to 4. there were.
[0003]
[Problems to be solved by the invention]
JP-A-55-84299 discloses a press machine (prior art 5) in which one end of a connecting rod is connected to a slide, and the other end of the connecting rod is connected to an eccentric position away from the center of the crankshaft. Have been. Japanese Patent Application Laid-Open No. 61-60300 discloses that one end of a connecting rod is connected to a slide, and the other end of the connecting rod is connected to an eccentric position away from the center of the journal. There has been disclosed a press machine (prior art 6) that changes a stroke of a slide by rotating a yoke. These prior arts 5 and 6 have the advantage that they have fewer components and higher precision than the prior arts 1 to 4, and are cheaper in the case of small machines. However, these prior arts 5 and 6 have a problem that the reduction ratio cannot be changed and the reciprocating operation of the slide cannot be arbitrarily set.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a press machine capable of arbitrarily setting a reciprocating operation of a slide with a simple configuration.
[0005]
[Means for Solving the Problems]
The present invention solves the above-mentioned problems by the following means.
Note that description will be given with reference numerals corresponding to the embodiment of the present invention, but the present invention is not limited to this embodiment.
The invention according to claim 1 is a slide (4) that reciprocates along slide guides (5a to 5d), a driving force generator (7) that generates a driving force for driving the slide, and the driving force generator. And a driving force transmission unit (8) for transmitting the driving force to the slide from above, wherein the driving force generation unit includes a servomotor having a rotating body (7a) rotating in a plane, The press machine, wherein the driving force transmission unit includes a connecting member (8a) that connects the rotating body and the slide so that the slide reciprocates according to the rotating operation of the rotating body. 1).
[0006]
According to a second aspect of the present invention, in the press machine according to the first aspect, the driving force generating unit is driven in a horizontal direction, so that a center axis (C ₀ ) of the slide and a rotation axis (C ₁ ) of the rotating body. A press machine characterized by comprising an offset amount variable section (11) for varying an offset amount (δ) of the press machine.
[0007]
According to a third aspect of the present invention, in the press machine according to the first or second aspect, the driving force generating unit is rotated in a vertical plane to change an inclination angle (θ) of the driving force generating unit. A press machine comprising a variable section (13, 14).
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view when the slide of the press machine according to the first embodiment of the present invention is located at the top dead center (the highest point). FIG. 2 is a front view when the slide of the press machine according to the first embodiment of the present invention is located at the bottom dead center (the lowest point). FIG. 3 is a cross-sectional view of the press machine according to the first embodiment of the present invention, and FIG. 3A is a cross-sectional view taken along a line III-IIIA of FIG. 1, and FIG. FIG. 3 is a sectional view showing a state cut along the line III-IIIB in FIG. 1.
[0009]
The press machine 1 is a device that presses an object to be processed. As shown in FIGS. 1 and 2, the press machine 1 includes a bolster 2, a bottom plate 3, a slide 4, slide guides (columns) 5 a to 5 d, a top plate 6, a driving force generator 7, A drive force transmission unit 8, a rotation detection unit 9, a drive control unit 10, and the like are provided.
[0010]
The bolster 2 is a member for detachably mounting the lower die, and the bottom plate 3 is a member for supporting and fixing the bolster 2. The slide 4 is a member that removably mounts the upper die and reciprocates along slide guides 5a to 5d. The slide 4 has guide portions 4a to 4d which are slidably fitted to the slide guides 5a to 5d. The slide guides 5a to 5d are members that guide the slide 4 movably, and the slide guides 5a to 5d connect the bottom plate 3 and the top plate 6. The top plate 6 is a member that supports and fixes the driving force generator 7.
[0011]
The driving force generator 7 is a part that generates a driving force for driving the slide 4. As shown in FIGS. 1 to 3, the driving force generating unit 7 is a servomotor having a rotating body (moving body) 7 a that rotates in a plane and a fixed body 7 b that rotatably supports the rotating body 7 a. . The driving force generator 7 is, for example, a thin disk servomotor (NMR Series manufactured by Nikki Denso Co., Ltd.) that generates a torque of about 7.5 Nm to 200 Nm and has a positioning accuracy angle of about ± 0.76 seconds. . The driving force generator 7 generates a magnetic force between the rotating body 7a and the fixed body 7b to rotate the rotating body 7a. Driving force generating unit 7, as shown in FIG. 3, the top plate 6 so as to separate the central axis of the slide 4 (press center) C ₀ and the axis of rotation C ₁ of the rotary member 7a is distance (offset amount) [delta] only Fixed to.
[0012]
The driving force transmission section 8 is a section that transmits driving force from the driving force generation section 7 to the slide 4. The driving force transmission unit 8 converts the rotation operation generated by the driving force generation unit 7 into a reciprocating operation of the slide 4. As shown in FIGS. 1 to 3, the driving force generator 7 includes a connecting member (connecting rod) 8a, ball cups 8b and 8c, and retainers 8d and 8e. The connecting member 8a is a connecting shaft (connecting rod) that connects the rotating body 7a and the slide 4 so that the slide 4 reciprocates according to the rotating operation of the rotating body 7a. Ball heads 8f and 8g are formed at both ends of the connecting member 8a. The ball cups 8b and 8c are portions that rotatably hold the ball heads 8f and 8g. Ball cup 8b, as shown in FIG. 3 (B), the axis of rotation of the ball head 8f is fixed to the slide 4 so as to coincide with the center axis C ₀ of the slide 4. Ball cup 8c, as shown in FIG. 3 (A), the axis of rotation of the ball head 8g is fixed on to the rotating body 7a away by the rotation axis C ₁ and the distance of the rotating body 7a (the offset amount) [delta] And rotates integrally with the rotating body 7a. The retainer 8d is a member that suppresses the ball head 8f so that the ball head 8f does not fall off the ball cup 8b, and the retainer 8e is a member that restrains the ball head 8g so that the ball head 8g does not fall off the ball cup 8c. .
[0013]
The rotation detector 9 is a device that detects the rotation of the rotating body 7a. The rotation detector 9 detects the rotation amount, the rotation direction, the rotation angle, and the like of the rotator 7a based on an output signal from an encoder or the like. The drive control unit 10 is a unit that controls the drive of the driving force generation unit 7 based on the detection result of the rotation detection unit 9. The drive control unit 10 changes the angular velocity of the rotating body 7a during one reciprocation of the slide 4 (one cycle of press working), or moves the rotating body 7a at a constant speed circular motion or one rotation based on the output signal of the rotation detecting unit 9. A part of the constant velocity circular motion is reciprocated.
[0014]
Next, the operation of the press machine according to the first embodiment of the present invention will be described.
FIG. 4 shows a stroke diagram of the slide when the servomotor of the press machine according to the first embodiment of the present invention makes a constant-speed circular motion. Here, the vertical axis shown in FIG. 4 is the stroke amount (stroke) S of the slide 4, and the horizontal axis is the rotation angle of the rotating body 7a.
When the rotation angle of the rotating body 7a is 0 ° as shown in FIG. 4, the connecting member 8a is in the most inclined state as shown in FIG. 1, and the slide 4 is located at the top dead center (the highest position). . As shown in FIGS. 3A and 4, when the rotating body 7 a rotates counterclockwise at a constant speed in a horizontal plane, the center axis C ₀ of the slide 4 and the rotating axis C of the rotating body 7 a as shown in FIG. ₁ is offset by the offset amount δ, the connecting member 8a turns around the ball head 8f. When the rotation angle of the rotating body 7a inclination of the connecting member 8a is gradually reduced to reach 180 °, connected with the central axis C ₀ of the rotational axis and the slide 4 of the ball head 8g as shown in Figure 2 is consistent The inclination of the member 8a becomes zero, and the slide 4 is located at the bottom dead center (the lowest position). When the rotating body 7a further rotates, the inclination of the connecting member 8a gradually increases, and when the rotation angle reaches 360 °, as shown in FIG. 1, the connecting member 8a tilts most, and the slide 4 is located at the top dead center. In this manner, when the rotating body 7a makes a circular motion at a constant velocity, the slide stroke diagram of the slide 4 becomes a curve approximating a sine wave as shown in FIG.
[0015]
The press machine according to the first embodiment of the present invention has the following effects.
(1) In the first embodiment, the driving force transmission unit 8 connects the connecting member 8a that connects the rotating body 7a to the slide 4 so that the slide 4 reciprocates according to the rotating operation of the rotating body 7a. Prepare. As a result, the driving force transmission unit 8 becomes a simple and simple mechanism, so that the number of parts is reduced, and the number of contacts is reduced to two, ie, the ball heads 8f and 8g, so that the contact clearance does not need to be specially managed. Accuracy can be maintained. Further, the reduction ratio can be changed as the slide 4 moves from the top dead center to the bottom dead center, and when the press machine 1 is a small machine, the cost can be reduced and the energy consumption can be reduced. For example, it can be used when the press load is low and the stroke amount S is about 1 to 2 mm.
[0016]
(2) In the first embodiment, the driving force generation unit 7 includes a servomotor having a rotating body 7a that rotates in a plane. As a result, the operation pattern of the slide 4 can be arbitrarily set by changing the angular velocity of the rotating body 7a or reciprocating the rotating body 7a at an arbitrary rotation angle.
[0017]
(2nd Embodiment)
FIG. 5 is a front view when the slide of the press machine according to the second embodiment of the present invention is located at the top dead center (the highest point). FIG. 6 is a stroke diagram when the offset amount of the press machine according to the second embodiment of the present invention is reduced. In the following, the same parts as those shown in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description is omitted.
[0018]
The offset variable section 11 shown in FIG. 5 drives the driving force generating section 7 in the horizontal direction (the direction of the arrow in the figure) to offset the center axis C ₀ of the slide 4 from the rotation axis C ₁ of the rotating body 7a. Is a part that changes. The offset amount variable section 11 is a linear motor or the like including a moving body 11a that supports the fixed body 7b of the driving force generating section 7 and a fixed body 11b that guides the moving body 11a so as to be movable in the horizontal direction. The position detection unit 12 is a device that detects the position of the moving body 11a, and detects a moving amount and a moving direction of the moving body 11a based on an output signal of an encoder or the like. The drive control unit 10 controls the drive of the drive force generation unit 7 and the offset amount variable unit 11 based on the detection results of the rotation detection unit 9 and the position detection unit 12.
[0019]
The stroke diagram of the slide shown in FIG. 6 shows the stroke in the case where the driving force generator 7 shown in FIG. 5 is driven leftward in the figure and the offset amount δ = δ / 2 shown in FIGS. FIG. In this case, as shown in FIG. 6, the stroke amount S of the slide 4 is smaller than the stroke amount S of the slide 4 shown in FIG. In the second embodiment, in addition to the effects of the first embodiment, the reduction ratio can be changed by changing the stroke amount S of the slide 4. For example, by varying the offset amount δ, the speed reduction ratio near the bottom dead center can be made 10% or more larger than the sine wave, and the energy transfer can be made advantageous.
[0020]
(Third embodiment)
FIG. 7 is a front view when the slide of the press machine according to the third embodiment of the present invention is located at the top dead center (the highest point). FIG. 8 is a slide stroke diagram when the inclination angle θ = + α of the linear motor of the press machine according to the third embodiment of the present invention. FIG. 9 is a slide stroke diagram when the inclination angle θ = −α of the linear motor of the press machine according to the third embodiment of the present invention.
[0021]
The inclination angle variable units 13 and 14 shown in FIG. 7 are parts that rotate the driving force generation unit 7 and vary the inclination angle θ of the driving force generation unit 7. The tilt angle variable units 13 and 14 are hydraulic actuators, pneumatic actuators, and the like. The tilt angle variable unit 13 is connected to one end of the fixed body 11b, and the tilt angle variable unit 14 is connected to the other end of the fixed body 11b. Are linked. The center of the fixed body 11b is rotatably connected to and supported by the top plate 6. The displacement detection unit 15 is a device that detects displacement of the piston rods 13a and 14a of the inclination angle variable units 13 and 14. The drive control unit 10 controls the drive of the drive force generation unit 7, the offset amount variable unit 11, and the tilt angle variable units 13 and 14 based on the detection results of the rotation detection unit 9, the position detection unit 12, and the displacement detection unit 15. In the third embodiment, in addition to the effects of the first embodiment and the second embodiment, as shown in FIGS. 8 and 9, the stroke of the slide 4 is varied by changing the inclination angle θ of the driving force generation unit 7. The quantity S can be varied.
[0022]
(Other embodiments)
The present invention is not limited to the embodiments described above, and various modifications or changes are possible, and these are also within the scope of the present invention. For example, in this embodiment, the angular velocity, the offset amount δ, or the inclination angle θ of the rotating body 7a can be changed, but they can be synchronized during one cycle of press working. Further, in this embodiment, the slide 4 and the rotating body 7a are connected by one connecting member 8a. However, these may be connected by a plurality of connecting members, and the number of contacts may be set to a plurality of points.
[0023]
【The invention's effect】
As described above, according to the present invention, the reciprocating operation of the slide can be arbitrarily changed with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a front view when a slide of a press machine according to a first embodiment of the present invention is located at a top dead center (a highest point).
FIG. 2 is a front view when the slide of the press machine according to the first embodiment of the present invention is located at the bottom dead center (the lowest point).
FIG. 3 is a cross-sectional view of the press machine according to the first embodiment of the present invention, in which (A) is a cross-sectional view taken along the line III-IIIA of FIG. 1, and (B) is a cross-sectional view of FIG. It is sectional drawing which shows the state cut | disconnected by the III-IIIB line.
FIG. 4 shows a stroke diagram of a slide when the servomotor of the press machine according to the first embodiment of the present invention makes a constant-speed circular motion.
FIG. 5 is a front view when a slide of a press machine according to a second embodiment of the present invention is located at a top dead center (the highest point).
FIG. 6 is a stroke diagram when the offset amount of the press machine according to the second embodiment of the present invention is reduced.
FIG. 7 is a front view when a slide of a press machine according to a third embodiment of the present invention is located at a top dead center (upmost point).
FIG. 8 is a stroke stroke diagram of a linear motor of a press machine according to a third embodiment of the present invention when the inclination angle θ = + α.
FIG. 9 is a slide stroke diagram when the inclination angle θ = −α of the linear motor of the press machine according to the third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Press machine 2 Bolster 4 Slide 5a-5d Slide guide 7 Driving force generation part 7a Rotating body 7b Fixed body 8 Driving force transmission part 8a Connecting member 11 Offset amount variable part 11a Moving body 11b Fixed body 13, 14 Inclination angle variable part 13a , 14a Piston rod C ₀ Center axis C of slide ₁ Rotation axis θ of rotating body Tilt angle

Claims (3)

A slide that reciprocates along a slide guide,
A driving force generator that generates a driving force for driving the slide;
A driving force transmission unit that transmits the driving force from the driving force generation unit to the slide;
A press machine comprising:
The driving force generator includes a servomotor having a rotating body that rotates in a plane,
The driving force transmission unit includes a connecting member that connects the rotating body and the slide, such that the slide reciprocates according to the rotating operation of the rotating body.
A press machine. The press machine according to claim 1,
The driving force generating unit is driven in a horizontal direction, and an offset amount varying unit that varies an offset amount between a center axis of the slide and a rotation axis of the rotating body is provided.
A press machine. In the press machine according to claim 1 or 2,
Comprising a tilt angle variable section that rotates the driving force generating section in a vertical plane and changes the tilt angle of the driving force generating section,
A press machine.

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