JP3901745B2 - Press machine - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a press apparatus that presses a vertically movable upper mold that is positioned in a horizontal direction with respect to a lower mold with a slide that moves up and down.
[0002]
[Prior art]
Conventionally, in this type of press apparatus, the upper die must be accurately positioned in the horizontal direction with respect to the lower die, and the upper die must be lowered while maintaining a parallel state with respect to the lower die. In this case, the upper die may be directly fixed to the slide if there is no horizontal play when the slide is raised or lowered. However, if the accuracy is increased to eliminate the horizontal play of the slide, the cost of the press device increases.
[0003]
Therefore, positioning of the upper mold with respect to the lower mold and maintenance of the parallel state are performed by a bolster that holds the lower mold and a guide post that stands perpendicularly to the lower mold itself, allowing mutual displacement between the slide and the upper mold. There is known a press device in which the upper die is lowered vertically and in parallel even if the slide is tilted or displaced in the horizontal direction. For example, Japanese Patent Laid-Open No. 5-261600 discloses a press device that is perpendicular to the lower die. The upper die is held vertically by a standing guide post, and the slide is connected to the upper surface of the upper die via a short ball joint having spherical portions at both ends, and slides for backlash. There is known a press apparatus in which the ball joint is inclined obliquely so as not to transmit the influence of the inclination and displacement due to the backlash to the upper die even when the ball is inclined or displaced in the horizontal direction.
[0004]
[Problems to be solved by the invention]
In the above conventional press device, the ball joint is tilted due to the tilt and displacement of the slide, so that the pressing force from the slide is transmitted to the upper die through the tilted ball joint, and the upper die is pushed down in an oblique direction rather than vertically downward A pressing force to be applied acts, thereby generating a horizontal component force. Then, the guide post receives the horizontal component force, and the positioning accuracy of the upper die with respect to the lower die is lowered early due to uneven wear of the guide post, and the service life of the press device is shortened.
[0005]
Therefore, in view of the above-described problems, the present invention provides a pressing device that improves the positioning accuracy of the upper die relative to the lower die without increasing the accuracy of sliding, and does not act on the upper die with a horizontal component force. For the purpose.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a press apparatus that presses a vertically movable upper mold that is positioned in a horizontal direction with respect to a lower mold with a slide that moves up and down. A spherical convex portion is provided, and a flange portion projecting around a receiving member having a concave spherical portion that engages with the convex portion on the upper surface of the upper mold is slidable horizontally on the substrate by a pressing member. The receiving member is slidably mounted in the horizontal direction on the substrate, and the peripheral surface of the flange portion is pressed in the horizontal direction with a support bar biased by a contracted spring, and the receiving member is pressed. The member can be returned to a predetermined neutral position .
[0008]
[Action]
Since the pressing force from the slide is transmitted to the upper die via the spherical convex portion, the pressing force can be applied vertically downward to the upper die even if the slide is inclined. Further, when the slide is displaced in the horizontal direction, the convex portion and the concave spherical portion of the receiving member do not coincide with each other, the convex portion hits the concave spherical portion, and a horizontal component force acts on the receiving member. Then, the receiving member slides by the horizontal component force, moves to a position that coincides with the concave ball portion, and eliminates the influence of the horizontal displacement of the slide.
[0010]
【Example】
Referring to FIG. 1, reference numeral 1 denotes a bolster, and a substrate 2 having a lower mold 20 on its upper surface is fixed to the upper surface thereof. A guide post 21 is erected vertically on the substrate 2. A substrate 3 that moves up and down while maintaining a parallel state with respect to the substrate 2 is provided along the guide post 21, and an upper die 30 is attached to the lower surface of the substrate 3. The substrate 3 is urged upward by a spring 22 contracted between the substrate 2 and when it is pushed by the slide 4 from above, the substrate 3 descends against the urging force of the spring 22, thereby It press-processes with blanks, such as an iron plate outside a figure, with a type 30. By the way, the adapter 41 is attached to the lower surface of the slide 4, and the movement in the horizontal direction is restricted by the vertical guides 42 facing the left and right sides, and the vertical movement along the guides 42 is performed. . The slide 4 is a pin that is rotatable with respect to at least one of the slide 4 and the link 43 with respect to a link 43 operated via a movement direction changing mechanism such as a crank mechanism or a knuckle mechanism as a drive source (not shown). 44. By the way, there is a clearance C between the slide 4 and the guide 42. For this reason, the slide 4 may be tilted within the range of the clearance C. When the slide 4 is tilted, the diagonal portions of the slide 4 abut against the guides 42 as shown in FIG. 1, so that the slide 4 rotates around the intersection 4 a of the diagonal lines of the slide 4. By the way, an adapter 41 having a spherical convex portion 41a is attached to the lower surface of the slide 4, and therefore the convex portion 41a can be formed into a spherical shape with a radius R centering on the intersection 4a. desirable. In this way, by forming the convex portion 41a of the adapter 41 into a spherical shape centered on the intersection point 4a, the spherical surface defined by the convex portion 41a cannot swing in the horizontal direction even if the slide 4 is tilted about the intersection point 4a. Then, by attaching a receiving member 31 having a concave ball portion 31a that engages with the convex portion 41a of the adapter 41 on the upper surface of the substrate 3, the downward pressing force of the slide 4 is distributed over the entire concave ball portion 31a. Thus, deformation and breakage of the convex portion 41a of the adapter 41 are prevented. Although there may be many intersection points 4a on a line parallel to the pins 44, it is desirable to form the convex portions 41a so as to have a spherical surface centered on a point located at the center of the slide 4.
[0011]
On the other hand, if the wear is caused by the influence of the clearance C or the corner portion of the slide 4 abutting against the guide 42, the slide 4 may not only swing but also move in the horizontal direction. In this case, the convex portion 41a of the adapter 4 and the concave spherical portion 31a of the receiving member 31 do not coincide with each other, and instead, a horizontal component force acts on the substrate 3 and the guide post 21 may be unevenly worn. Therefore, instead of fixing the receiving member 31 to the substrate 3, the flange portion 32 protruding around the receiving member 31 is pressed by the pressing member 5, and the receiving member 31 is slidably attached in the horizontal direction. That is, when the slide 4 moves in the horizontal direction due to the clearance C and the adapter 41 is displaced with respect to the receiving member 31, the adapter 41 comes into contact with the receiving member 31, whereby the horizontal force is applied to the receiving member 31. However, the receiving member 31 slides in the horizontal direction due to the horizontal component force, and the convex portion 41a of the adapter 41 and the concave spherical portion 31a of the receiving member 31 coincide with each other. As a result, the horizontal component force acting on the receiving member 31 disappears, and only the downward pressing force acts on the substrate 3. As shown in FIG. 2, the holding member 5 is provided with a support bar 51 that presses against the receiving member 31 from the horizontal direction by the urging force of the contracted spring 52. It was made to press from four directions, and even if the receiving member 31 slid, after the slide 4 rose, the receiving member 31 returned to the predetermined neutral position.
[0012]
In the above embodiment, the adapter 41 is attached to the lower surface of the slide 4 to provide the convex portion 41a. However, the spherical convex portion may be directly provided on the lower surface of the slide 4.
[0013]
Further, in the above embodiment, the slide 4 is raised to a position where the adapter 41 and the receiving member 31 are separated from each other. However, the stroke of the slide 4 is shortened so that the adapter 41 and the receiving member 31 are always in contact with each other. In this case, the impact and noise generated at the time of contact between the adapter 41 and the receiving member 31 are eliminated.
[0014]
【The invention's effect】
As is apparent from the above description, according to the present invention, the upper mold can be vertically lowered without generating a horizontal component force with respect to the lower mold without holding the slide in the horizontal direction with high accuracy. It can be pushed down, and the cost of the entire apparatus can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an embodiment of the present invention. FIG. 2 is a partially enlarged view showing a structure of a pressing member.
1 Bolster 2 Substrate 3 Substrate 4 Slide 5 Holding member 20 Lower die 21 Guide post 22 Spring 30 Upper die 31 Receiving member 31a Concave ball portion 41 Adapter 41a Convex portion 42 Guide

Claims (1)

In a pressing device that performs pressing by pressing an up / down movable upper mold that is positioned horizontally with respect to the lower mold with a slide that moves up and down, a spherical convex portion is provided on the lower surface of the slide, and the upper mold A flange portion projecting around a receiving member having a concave ball portion that engages with the convex portion on the upper surface is slidably pressed horizontally on the substrate by a pressing member, and the receiving member is horizontally placed on the substrate. The bearing member can be returned to a predetermined neutral position by pressing the peripheral surface of the flange portion in a horizontal direction with a support rod slidably mounted in a direction and urged by a contracted spring. A press device characterized by.

Images