JP5723613B2 - Press machine - Google Patents

Description

  The present invention includes a nut member rotatably provided on a frame and a first motor for rotating the nut member, and a screw member screwed into the nut member so as to be rotatable and movable in a longitudinal direction. A second motor for rotating the screw member is provided, and an engagement portion that is rotatably engaged with the tip portion of the screw member is provided, and in the moving direction of the screw member integrally with the engagement portion. The present invention relates to a press machine provided with a movable ram, and more particularly to a press machine capable of smoothly moving the screw member smoothly.

  In the press machine, a press machine including a motor for moving the ram up and down at high speed and a high-output motor that functions when the ram is pressurized has been proposed (for example, Japanese Patent No. 3953414).

Japanese Patent No. 3953414

  The press machine described in Patent Document 1 has a configuration as shown in FIG. That is, the press machine 1 includes a frame 3, and a nut member 5 is rotatably provided on the upper portion of the frame 3. The pulley 7 provided in the nut member 5 has a belt 13 wound around a driving pulley 11 provided in the first motor 9 mounted on the frame 3. Therefore, when the first motor 9 is rotated forward and backward, the nut member 5 is rotated forward and backward in conjunction with each other.

  The frame 3 is provided with a guide member 15 in the vertical direction. A ram 17 is guided and supported on the guide member 15 so as to be movable up and down. In order to move the ram 17 up and down, a screw member 19 is screwed through the nut member 5 so as to be rotatable and movable up and down. In order to rotate the screw member 19, a pulley 21 is integrally attached to an upper end portion of the screw member 19. The pulley 21 has a belt 27 wound around a driving pulley 25 provided in the second motor 23.

  The second motor 23 is guided and supported by a vertical guide 31 in a support bracket 29 provided outside the upper portion of the frame 3 so as to move up and down integrally with the screw member 19. ing. The distal end portion of the connecting bar 35 integrally connected to the motor bracket 33 of the second motor 23 on the base end side is connected to the screw member 19 so as to be relatively rotatable.

  And the front-end | tip part (lower end part) of the said screw member 19 is the structure engaged relatively rotatably with the engaging part 37 with which the upper part of the said ram 17 was equipped. More specifically, the lower end portion of the screw member 19 is provided with a flange portion 19F, and the engagement portion 37 is provided with an engagement concave portion 39 that rotatably includes the flange portion 19F. . As shown in FIG. 2, a bearing 41 and an oil seal 43 for restricting the vertical movement of the flange portion 19F are housed in the engagement recess 39.

  In the above-described configuration, since the ram 17 is suspended from the screw member 19 in a normal state, the ram 17 is between the lower surface of the flange portion 19F of the screw member 19 and the bottom surface (upper surface) of the engagement recess 39. It is in a state in which a minute clearance C is generated. Therefore, the screw member 19 can be smoothly rotated with respect to the ram 17.

  With the above configuration, when the first motor 9 is in a stopped state, when the second motor 23 is rotated at high speed and the screw member 19 is lowered, the ram 17 is also lowered at high speed. At this time, the ram 17 can be lowered at a higher speed or can be lowered at a lower speed by appropriately rotating the first motor 9 forward and backward. As described above, when the ram 17 is lowered, the punch P provided on the ram 17 comes into contact with the workpiece W on the die D, and a load is applied to the ram 17, the lower surface of the flange portion 19F and the engagement recess 39 are formed. The top surface (bottom surface) comes into contact with the ram 17 and the screw member 19 cannot be rotated. As described above, when the lower surface of the flange portion 19F comes into contact with the bottom surface of the engagement recess 39, the rotation of the second motor 23 is stopped, and the screw member is rotated by the rotation of the nut member 5 due to the rotation of the first motor 9. The ram 17 is lowered via 19.

  That is, by controlling the rotation of the first and second motors 9 and 23, the ram 17 can be moved up and down at a high speed, and when the load is applied to the ram 17, the rotation of the first motor 9 is performed. Thus, the ram 17 can be lowered at a low speed and the workpiece W can be pressed with a large applied pressure.

  By the way, in the above-described configuration, when the screw member 19 is rotated at a high speed so as to lower the ram 17 at a high speed when the ram 17 is in the raised state, the screw member 19 is moved with respect to the ram 17 in the stopped state. Will begin to descend rapidly. Therefore, the lowering speed of the screw member 19 is larger than the lowering speed of the ram 17 that starts to descend due to its own weight, and the lower surface of the flange portion 19F of the screw member 19 may abut against the bottom surface of the engaging recess 39 of the ram 17.

  That is, although the ram 17 is descending and no load is applied, the lower surface of the flange portion 19F and the bottom surface of the engaging recess 39 come into contact with each other, and the screw member 19 while the ram 17 is descending. Smooth rotation may interfere.

  In the conventional configuration as described above, the pulley 21 is provided at the upper end portion of the screw member 19, and the second motor 23 for rotating the pulley 21 moves up and down outside the upper end portion of the frame 3. Since it is provided freely, the overall configuration becomes high, and there is a problem in simplifying and compacting.

The present invention has been made in view of the conventional problems as described above, and includes a nut member rotatably provided on a frame and a first motor for rotating the nut member, and the nut member is rotatable. A screw member that is screwed in the longitudinal direction and a second motor for rotating the screw member, and an engaging portion that is rotatably engaged with the tip of the screw member. A press machine provided with a ram that is movable in the moving direction of the screw member integrally with the engaging portion, wherein the engaging portion includes a contact surface that can come into contact with a tip surface of the screw member, When the screw member is rotated with respect to the ram and rapidly lowered between the tip surface of the screw member and the contact surface of the engaging portion , the tip surface and the contact surface come into contact with each other. The screw part is temporarily rotated by friction Prevented from stopping, and the load on the ram is characterized in that it comprises a resilient member for permitting the contact between the tip surface and the contact surface only when acted.

  In the press machine, an annular groove is provided on one of a front end surface of the screw member or a contact surface of the engaging portion, and an annular elastic member is provided in the annular groove. Is.

  Further, in the press machine, the screw member is integrally provided with a rotating member between the nut member and the tip surface of the screw member, and the tip of the screw member is relatively positioned with respect to the screw member. The motor bracket provided rotatably is provided with the second motor, and the second motor and the rotating member are interlockedly connected to each other.

  According to the present invention, the tip surface and the contact surface are normally kept separated from each other between the tip surface of the screw member for moving the ram up and down and the contact surface of the engaging portion. Since the elastic member for allowing the tip surface and the contact surface to contact only when a load during press working is applied to the ram, the screw member can be moved with respect to the ram at high speed. Even if the process starts with the above, until the load at the time of pressing is applied to the ram, the tip surface and the contact surface do not contact each other, and the smooth rotation of the screw member is maintained. It is.

It is whole explanatory drawing which shows the structure of the conventional press machine. It is explanatory drawing which shows the structure and effect | action of the principal part of the conventional press machine. It is explanatory drawing which shows the structure of the principal part of the press machine which concerns on embodiment of this invention. It is explanatory drawing which shows the positional relationship of the 1st, 2nd motor, a nut member, and a screw member in the press machine which concerns on embodiment of this invention. It is a section explanatory view showing the composition of the principal part of the press machine concerning the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Since the overall configuration of the press machine is substantially the same as that of the press machine described above, only the configuration of the main part will be described. Further, in the components of the press machine, components having the same function are denoted by the same reference numerals, and redundant description is omitted.

  Referring to FIG. 3, a press machine 45 according to an embodiment of the present invention includes a cylindrical support block 47 fixed to the frame 3, and a plurality of bearings 49 are provided in the support block 47. A nut member 5 is rotatably supported. A pulley 7 (see FIG. 4) integrally provided on the upper portion of the nut member 5 is provided with a belt 13 wound around a drive pulley 11 provided in a first motor 9 mounted on a part of the frame 3. Is hung around. Therefore, the nut member 5 can be rotated forward and backward by rotating the first motor 9 forward and backward.

  A screw member 19 is screwed into the nut member 5 so as to be movable in the longitudinal direction, that is, the vertical direction. The lower part of the screw member 19 is connected to the ram 17. An engaging portion 51 corresponding to the engaging portion 37 is provided on the upper portion of the ram 17 so as to be swingable in the left-right direction (left-right direction in FIG. 4).

  More specifically, an arc-shaped concave curved surface 53 is formed on the upper surface of the ram 17 in the front-rear direction (a direction perpendicular to the paper surface in FIG. 4 and a left-right direction in FIG. 3). The concave curved surface 53 is engaged with the arcuate convex curved surface on the lower surface of the swing engagement member 57 provided on the lower surface of the swingable pressure member 55 so as to swing. In order to prevent the pressurizing member 55 from detaching upward from the upper surface of the ram 17, fixing bolts are provided at both front and rear end portions of the penetrating rod 59 penetrating the ram 17 in the front-rear direction. A fixing tool 61 such as is vertically penetrated. The distal end (upper end) portion of the fixture 61 is screwed and connected to the pressurizing member 55, and there is a fixture between the lower end portion of the fixture 61 and the penetrating rod 59. An elastic member 63 such as a disc spring that biases 61 downward is elastically mounted.

  Therefore, relative swinging in the left-right direction between the ram 17 and the pressure member 55 is allowed. Note that the concave curved surface 53 and the convex curved surface of the swinging engagement member 57 are formed into a hemispherical concave curved surface and a convex curved surface, respectively, so that the relative front-rear and left-right directions between the ram 17 and the pressure member 55 are increased. Can be swung.

  In order to connect the lower end portion of the screw member 19 and the ram 17, a circular recess 65 (see FIG. 5) is formed on the upper surface of the pressure member 55 constituting a part of the engagement portion 51. In the recess 65, a disc-shaped contact plate 69 whose rotation is restricted by a pin 67 (see FIG. 3) is provided. The upper surface of the contact plate 69 forms a contact surface that can contact the tip surface (lower end surface) of the screw member 19, and an annular groove 71 is formed on the upper surface. 71 is elastically mounted with an elastic member 73 such as an O-ring that can partially protrude upward from the upper surface. The contact plate 69 may be omitted, and the bottom surface of the recess 65 may be used as the contact surface.

  A flange member 75 corresponding to the flange portion 19F is integrally attached to a lower end portion of the screw member 19, and a disk-like motor support bracket 79 is relatively rotatably provided via a bearing 77. It has been. The motor support bracket 79 is provided with a roller pin 81 protruding horizontally in the rearward direction (rightward in FIG. 3). A guide roller 83 rotatably provided on the roller pin 81 is engaged in a vertical guide groove of a guide member 85 provided perpendicular to the frame 3 so as to be movable up and down. That is, the motor support bracket 79 moves up and down integrally with the screw member 19, but the rotation of the screw member 19 in the horizontal direction around the axis is restricted.

  In order to move the ram 17 up and down integrally with the screw member 19, the upper surface of the pressure member 55 is vertically penetrated through vertical openings 79 </ b> A formed at a plurality of locations of the motor support bracket 79. A plurality of hook members 83 are integrally provided, and a horizontal inward projecting portion 83P that can abut on the upper surface of the motor support bracket 79 is provided at the upper end of the hook member 83. . When the front end surface of the screw member 19, that is, the lower surface of the flange member 75 and the upper surface (contact surface) of the contact plate 69 are in contact with each other, the lower surface of the protrusion 83 </ b> P and the motor support bracket 79 are A slight clearance C is generated between the upper surface and the upper surface.

  In other words, in a normal state where the load during press working does not act on the ram 17, the ram 17 is in a state of being lowered by its own weight with respect to the screw member 19. In other words, the protrusion 83P of the hook member 83 is supported in contact with the upper surface of the motor support bracket 79, whereby the ram 17 is supported by being suspended by the screw member 19.

  As described above, when the protruding portion 83P of the hook member 83 is abutted and supported on the upper surface of the motor support bracket 79, the motor support bracket 79 is raised relative to the pressure member 55 in FIG. Thus, a gap corresponding to the clearance C is generated between the upper surface of the contact plate 69 and the lower surface of the flange member 75 and the motor support bracket 79. In this case, the upper part of the elastic member 73 protrudes upward from the upper surface of the contact plate 69. At this time, the elastic member 73 may be in a state where it is in contact with the distal end surface (lower surface) of the screw member 19 or in a state where it is separated.

  In the present embodiment, the case where the elastic member 73 contacts the lower surface of the motor support bracket 79 is illustrated. However, the motor support bracket 79 moves up and down integrally with the screw member 19, and a gap is generated between the lower surface of the flange member 75 integral with the screw member 19 and the upper surface of the contact plate 69. The lower surface of the motor support bracket 79 is flush with the lower surface of the flange member 75. Therefore, the lower surface of the motor support bracket 79 can be regarded as the same surface as the lower surface of the screw member 19.

  Further, the elastic member 73 may be disposed at a position facing the flange member 75. Further, since it is relative whether the elastic member 73 is provided on the pressure member 55 side or the screw member 19 side, an annular groove is formed on the lower surface of the flange member 75, and the inside of the annular groove is formed. It is also possible to adopt a configuration in which the elastic member 73 is provided. Furthermore, it is also possible to have a structure in which a plurality of recesses are provided on at least one of the lower surface of the flange member 75 or the upper surface of the contact plate 69 and the elastic member is accommodated in a slightly protruding state in the recess. is there.

  As illustrated in FIG. 4, the screw member 19 protrudes downward from the nut member 5, that is, between the nut member 5 and the front end surface (lower end surface) of the screw member 19. A pulley 21 </ b> A corresponding to the pulley 21 as a rotating member is integrally attached to 19. In order to rotate the pulley 21 </ b> A, a motor bracket 85 is integrally attached to the motor support bracket 79, and the second motor 23 is attached to the motor bracket 85. In order to interlock the second motor 23 and the pulley 21A, a belt 27 is wound around the driving pulley 25 and the pulley 21A provided in the second motor 23.

  With the configuration as described above, when the second motor 23 is rotated at a high speed while the first motor 9 is stopped, the screw member 19 is rotated at a high speed and the ram 17 is moved up and down at a high speed. Further, when the first motor 9 is rotated while the second motor 23 is stopped, the nut member 5 is rotated and the screw member 19 is moved up and down. That is, since the first motor 9 for rotating the nut member 5 and the second motor 23 for rotating the screw member 19 are provided, the same operations and effects as those of the conventional press machine described above are provided. Can be played.

  In the above configuration, the lower surface of the flange member 75 or the lower surface of the motor support bracket 79 corresponding to the front end surface of the screw member 19 and the contact surface of the engagement portion 51, that is, the upper surface of the contact plate 69 are provided. In a normal state, the tip end surface and the contact surface are held apart from each other, and only when the punch P provided on the ram 17 contacts the workpiece W and a load during press working is applied to the ram 17. An elastic member 73 that allows contact between the tip surface and the contact surface is interposed.

  Accordingly, when the second motor 23 is rotated at a high speed while the ram 17 is in the raised state and the descending of the screw member 19 is started at a high speed, the screw member 19 rapidly moves relative to the stopped ram 17. Since the descent starts, the lower end surface (tip surface) of the screw member 19 tends to contact the upper surface (contact surface) of the contact plate 69 in the engaging portion 51. However, since the elastic member 73 is interposed between the contact surface and the tip surface, it is possible to prevent the tip surface and the contact surface from contacting each other. Therefore, when the ram 17 is descending from the raised position, the tip surface and the contact surface come into contact with each other, and the screw member 19 does not temporarily stop rotating due to friction, so that the screw member 19 can be smoothly moved. And the ram 17 can be smoothly lowered.

  When the punch P provided at the lower portion of the ram 17 abuts on the workpiece W on the die D and the reaction force acts on the ram 17, that is, when a load during pressing is applied to the ram 17, the elastic member 73 is compressed, the tip surface of the screw member 19 comes into contact with the contact surface of the contact plate 69, and the screw member 19 cannot be rotated by the frictional force. As described above, when the distal end surface of the screw member 19 contacts the contact plate 69, the second motor 23 is stopped and the nut member 5 is rotated by driving the first motor 9.

  Further, in the above configuration, the pulley 21A is provided on the lower end side of the screw member 19 projecting downward from the nut member 5, and the motor support bracket 79 provided rotatably relative to the screw member 19 includes: Since the second motor 23 for rotating the pulley 21A is provided, the overall height of the press machine can be suppressed, and the configuration can be simplified and made compact. is there.

DESCRIPTION OF SYMBOLS 1,45 Press machine 3 Frame 5 Nut member 7, 21 Pulley 9 1st motor 11, 25 Drive pulley 17 Ram 19 Screw member 23 2nd motor 51 Engagement part 57 Swing engagement member 69 Contact plate 71 Annular Groove 73 Elastic member 75 Flange member 79 Motor support bracket 79A Opening 83 Hook member 83P Projection

Claims (3)

A nut member rotatably provided on the frame and a first motor for rotating the nut member, and a screw member screwed into the nut member so as to be rotatable and movable in the longitudinal direction and the screw member are rotated. A ram that includes a second motor that is engaged with the front end of the screw member so as to be relatively rotatable and is movable in the moving direction of the screw member together with the engagement portion. A press machine provided with a contact surface capable of contacting the front end surface of the screw member in the engagement portion, and between the front end surface of the screw member and the contact surface in the engagement portion Further, when the screw member is rotated relative to the ram and rapidly lowered, the tip surface and the contact surface come into contact with each other, and the screw portion is prevented from temporarily stopping rotation due to friction. and the ram when the load is applied Press machine, characterized in that it comprises a resilient member for allowing the contact of the saw the front end surface and the abutment surface.   2. The press machine according to claim 1, wherein an annular groove is provided on one of a front end surface of the screw member or an abutting surface of the engaging portion, and an annular elastic member is provided in the annular groove. Features a press machine.   The press machine according to claim 1 or 2, wherein a rotating member is integrally provided on the screw member between the nut member and a tip surface of the screw member, and the screw member is provided at a tip portion of the screw member. A press machine comprising: a motor bracket that is relatively rotatable with respect to the second motor; and the second motor and the rotating member that are linked to each other.

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