JP4501906B2 - Molding equipment - Google Patents

Description

  The present invention relates to a molding apparatus for compressing and molding powder into a predetermined shape.

As a molding apparatus for compressing powder, for example, a device described in Patent Document 1 is known. The molding apparatus described in this document includes a cylindrical die fixed to a die plate, a lower punch fitted in the die so as to be slidable up and down, and slidable up and down in the die. An upper punch that is movably fitted, and a feeder that slides on the die and the die plate in the front-rear direction and supplies the raw material powder into the die are provided. In such a molding apparatus, the green compact is removed from the die and the die plate in conjunction with the feeder in order to discharge the green compact (molded product) after the molding with the upper end of the lower punch protruding from the upper surface of the die. A green compact dispensing device for dispensing is mounted.
JP-A-6-170597

  However, the above-described prior art has the following problems. That is, since the feeder is attached to the feeder, the structure of the feeder is not only complicated, but the weight of the feeder is increased. For this reason, it becomes difficult to operate the feeder at high speed. Further, since the feeder simply repeats the forward / backward movement, when the feeder contacts the molded body, there is a possibility that the molded body is impacted and damaged. Further, for example, when the molding cycle becomes high speed, the operation of the lower punch having a large inertia cannot follow the operation of the feeder, so that the feeder may come into contact with the lower punch and the lower punch may be damaged.

  An object of the present invention is to provide a molding apparatus that can reliably prevent damage to the molded body and the lower punch when the molded body is discharged while simplifying and reducing the weight of the feeder.

The present invention is a molding apparatus for compressing and molding powder into a predetermined shape, a die having a cavity filled with powder, a lower punch inserted into the cavity from the lower side of the die, and a cavity from the upper side of the die. An upper punch that compresses the powder inserted and filled in the cavity in cooperation with the lower punch, a feeder that supplies the powder to the cavity, and a first cam that moves the die up and down relative to the lower punch. A first cam drive system, a second cam drive system having a second cam for moving the upper punch up and down, and a first for moving the feeder forward and backward between an initial position away from the cavity and a position covering the cavity . A third cam drive system having three cams, and a drive synchronization means for rotating the first cam, the second cam, and the third cam in synchronism with each other. From a state where a relatively stopped by and against relatively raised with respect to the lower punch die as upper end of the lower punch enters the cavity, thereby subsequently relatively stopped die against the lower punch The third cam moves the feeder forward from the initial position toward the cavity in a predetermined angle range, stops the feeder just before the cavity, and then the die is relative to the lower punch. It is characterized by having a shape that resumes the advancement of the feeder toward the position covering the cavity after the ascent .

  When molding is performed using such a molding apparatus, a molded body is produced as follows while the first cam, the second cam, and the third cam rotate once in synchronization. That is, first, the feeder is filled with powder from the feeder while the feeder is advanced over the cavity by the third cam drive system. Thereafter, the feeder is retracted away from the cavity by the third cam drive system, the upper punch is lowered by the second cam drive system, and the raw material powder is compressed by the upper punch and the lower punch, thereby forming a compact. Get. Then, the die is lowered relative to the lower punch by the first cam drive system, and after the molded body is extracted from the cavity, the molded body is discharged.

  Here, the discharge operation of the molded body is such that the die is stopped, raised and stopped in order relative to the lower punch in the first cam, and the feeder is advanced and stopped in order relative to the cavity in the third cam. It is executed within an angle range corresponding to the shape to be advanced. At this time, when the feeder is stopped, the shape of the third cam is set so that the feeder stops at a position before the cavity. Also, when the die is raised relative to the lower punch, the shape of the first cam is set so that the die rises relative to the lower punch until the upper end of the lower punch enters the die cavity. deep. Further, when the feeder advances again, the shape of the third cam is set so that the die advances relative to the lower punch and then the feeder advances again.

  By configuring the first cam and the third cam as described above, the operation of paying out the molded body is specifically performed as follows. That is, when the molded body is extracted from the die cavity, the upper end of the lower punch is in a state of protruding from the upper surface of the die. When the first cam, the second cam, and the third cam are rotated synchronously from this state, first, the third cam drive system moves forward to a position immediately before the feeder contacts the molded body. Next, the die is raised relative to the lower punch by the first cam drive system, and the upper end of the lower punch enters the cavity of the die. Next, the feeder advances again toward the cavity by the third cam drive system. Then, the molded body is pushed out by the feeder.

  As described above, by temporarily stopping the feeder immediately before the feeder comes into contact with the molded body, the impact applied to the molded body when the feeder that resumes moving forward contacts the molded body is sufficiently reduced. Damage can be reliably prevented. In addition, after the feeder is temporarily stopped, the feeder is lowered by raising the die relative to the lower punch until the upper end of the lower punch enters the die cavity, and then restarting the feeder. Since contact with the punch is prevented, damage to the feeder can be reliably prevented. Furthermore, since it is not necessary to attach a special mechanism for delivering the molded body to the feeder, the feeder can be simplified and reduced in weight.

  Preferably, the drive synchronization means includes a main shaft connected to the first cam, the second cam, and the third cam, and a drive motor that rotates the main shaft. In this case, the drive synchronization means can be realized with a simple structure at low cost.

  ADVANTAGE OF THE INVENTION According to this invention, damage to a molded object and a lower punch at the time of discharge | payout of a molded object can be prevented reliably, aiming at the simplification and weight reduction of a feeder. Thereby, the feeder can be moved at a high speed, and the discharge operation of the molded body can be simplified.

  Hereinafter, a preferred embodiment of a molding apparatus according to the present invention will be described in detail with reference to the drawings.

  1 is a cross-sectional view of an embodiment of a molding apparatus according to the present invention as viewed from the front side, FIG. 2 is a cross-sectional view of the molding apparatus shown in FIG. 1 as viewed from the side, and FIG. It is sectional drawing which looked at the cam part of the shaping | molding apparatus shown in FIG. 1 from the upper surface side. In each figure, the molding apparatus 1 of the present embodiment is a cam press apparatus that compresses and molds material powder such as magnetic powder and dielectric powder into a predetermined shape (for example, a rectangular parallelepiped shape). The molding apparatus 1 includes a frame body 2, a die set (lower ram) 3 attached to the upper portion of the frame body 2, and an upper ram 4 disposed above the die set 3.

  As shown in FIG. 4, the die set 3 has a fixing plate 5 fixed to the frame body 2, and two rods 6 extending in the vertical direction are slidably passed through the fixing plate 5. Yes. A base 7 is fixed to the upper end of each rod 6, and a connecting plate 8 is fixed to the lower end of each rod 6. A die 9 is placed on the base 7. The die 9 is formed with a plurality (five in this case) of cavities 10 penetrating in the vertical direction and filled with material powder. A feeder 11 is provided on the die 9 so as to be movable in the front-rear direction (the front and back direction in FIG. 4). The feeder 11 has a feeder cup 11 a for supplying material powder to each cavity 10. A protrusion 12 is provided on the fixing plate 5, and a plurality of (here, five) lower punches 13 inserted into the cavities 10 from below the die 9 are fixed to the upper portion of the protrusion 12. Yes.

  On the base 7, two rods 14 extending in the vertical direction are erected so as to sandwich the die 9. These rods 14 slidably pass through an elevating body 15 constituting a part of the upper ram 4. The lifting body 15 is provided with a plurality of (here, five) upper punches 16 inserted into the cavities 10 from the upper side of the die 9. Each upper punch 16 compresses the material powder filled in the cavity 10 in cooperation with the opposing lower punch 13.

  Returning to FIGS. 1 to 3, the ram body 4 a is connected to the upper portion of the elevating body 15. The ram body 4a is provided with an air cylinder 17 for pressure release (hold down). The ram body 4a is connected to a frame body 19 disposed at the lower part of the frame body 2 via two rods 18 extending in the vertical direction.

  A frame body 21 is connected to the connecting plate 8 of the die set 3 via a connecting member 20. Each rod 18 is slidably passed through the frame body 21. A nut portion 22 is fixed to the lower portion of the frame body 21. An adjusting screw 23 is screwed into the nut portion 22. A contact member 24 is fixed to the lower end of the adjusting screw 23. A contact plate 25 is provided on the top of the contact member 24 (see FIG. 5). Further, two stoppers 26 that engage with the contact plate 25 are arranged above the contact member 24 so as to sandwich the adjustment screw 23. The contact member 24 and each stopper 26 are for restricting the upward movement of the die 9.

  The height position of the contact member 24 can be adjusted by an adjustment handle 27 and an adjustment mechanism 28 provided at the front end of the frame body 2. As shown in FIG. 5, the adjustment mechanism 28 has an adjustment shaft 29 connected to the adjustment handle 27, and a worm gear 30 is attached to the tip of the adjustment shaft 29. The worm gear 30 meshes with a spur gear 32 attached to the contact member 24 via an intermediate gear 31.

  When the adjustment handle 27 is turned, the contact member 24 rotates via the adjustment shaft 29, the worm gear 30, the intermediate gear 31 and the spur gear 32, and accordingly, the adjustment screw 23 is screwed with respect to the nut portion 22. Since it moves up and down, the height position of the contact member 24 changes. Since the distance between the contact member 24 and the stopper 26 is changed by changing the height position of the contact member 24 in this way, the amount of movement until the contact plate portion 25 contacts the stopper 26 is changed. A scale 33 for monitoring the amount of movement of the contact member 24 up to the stopper 26 is provided below the contact member 24.

  The molding apparatus 1 also includes a die drive system 34 for moving the die 9 in the vertical direction, an upper ram drive system 35 for moving the upper ram 4 in the vertical direction, and the feeder 11 in the cavity 10 of the die 9. A feeder drive system 36 for moving the stopper 26 in the front-rear direction (lateral direction) and a stopper drive system 37 for moving the stoppers 26 in the vertical direction are further provided.

  The die drive system 34 includes a die drive cam 38 and a lever 39 as shown in FIG. The lever 39 is pivotally supported by a shaft portion 40 provided on the frame body 2. A cam follower 41 that is in direct contact with the die driving cam 38 is provided at the base end of the lever 39. The distal end portion of the lever 39 is coupled to the frame body 21 so as to be rotatable. In addition, two air cylinders 42 are provided between the frame body 21 and the frame body 2 to prevent the cam follower 41 from being separated from the die drive cam 38 when the die drive cam 38 rotates.

  The upper ram drive system 35 includes an upper ram drive cam 43 and a lever 44 as shown in FIG. The lever 44 is pivotally supported by a shaft portion 45 provided on the frame body 2. A cam follower 46 that directly contacts the upper ram drive cam 43 is provided at the base end of the lever 44. The tip of the lever 44 is connected to the frame body 19 so as to be rotatable relative to the frame body 19. Further, four air cylinders 47 are provided between the frame body 19 and the frame body 2 to prevent the cam follower 46 from separating from the upper ram driving cam 43 when the upper ram driving cam 43 rotates. Yes.

  As shown in FIG. 8, the feeder drive system 36 includes a feeder drive cam 48 and a lever 49. The lever 49 is pivotally supported by a shaft portion 50 provided on the frame body 2. A cam follower 51 that directly contacts the feeder driving cam 48 is provided at the base end of the lever 49. The tip of the lever 49 is connected to a link 52 that is connected to the feeder 11. An air cylinder 53 is provided between the lever 49 and the frame body 2 to prevent the cam follower 51 from separating from the feeder driving cam 48 when the feeder driving cam 48 rotates.

  As shown in FIG. 9, the stopper drive system 37 includes a die regulating cam 54 and a lever 55. The lever 55 is pivotally supported by a shaft portion 56 provided on the frame body 2. A cam follower 57 that is in direct contact with the die regulating cam 54 is provided at the base end of the lever 55. The tip of the lever 55 is connected to each stopper 26. An air cylinder 58 is provided between the lever 55 and the frame body 2 to prevent the cam follower 57 from separating from the die regulating cam 54 when the die regulating cam 54 rotates.

  The die driving cam 38, the upper ram driving cam 43, the feeder driving cam 48 and the die regulating cam 54 are connected to a main shaft 59 disposed at the lower part of the frame 2. The main shaft 59 is rotationally driven by a drive motor 60. When the main shaft 59 is rotated by the drive motor 60, the cams 38, 43, 48, 54 rotate in synchronization. The cams 38, 43, 48, and 54 are constituted by, for example, plate cams or split cams.

  When the die driving cam 38 is rotated by the rotation of the main shaft 59, the lever 39 swings and the frame body 21 moves up and down with the air cylinders 42 extended and retracted. The rods 6 connected to each other move up and down, and accordingly, the die 9 moves up and down relative to the lower punch 13. When the upper ram driving cam 43 is rotated by the rotation of the main shaft 59, the lever 44 swings and the frame body 19 moves up and down with the air cylinders 47 extended and retracted. The upper ram 4 moves up and down via the rod 18, and the upper punch 16 moves up and down accordingly. When the feeder driving cam 48 is rotated by the rotation of the main shaft 59, the lever 49 swings in a state where the air cylinder 53 is expanded and contracted, and the feeder 11 moves on the die 9 in the front-rear direction via the link 52. When the die regulating cam 54 is rotated by the rotation of the main shaft 59, the lever 55 is swung while the air cylinder 58 is expanded and contracted, and the stoppers 26 are moved up and down.

  The shapes of the die driving cam 38, the upper ram driving cam 43, the feeder driving cam 48, and the die regulating cam 54 are in accordance with a cam curve diagram (showing the cam movement) as shown in FIG. It has become. In FIG. 10, the die driving cam 38 has a shape corresponding to the solid cam curve R, and the upper ram driving cam 43 has a shape corresponding to the one-dot chain line cam curve S. The cam 48 has a shape corresponding to the rough dashed cam curve T, and the die regulating cam 54 has a shape corresponding to the dense dashed cam curve U. Further, the horizontal axis in FIG. 10 indicates the rotation angle from the reference position (0 degree), and the vertical axis in FIG. 10 indicates the height position of the cams 38, 43, 54 and the front-rear position of the cam 48. The cam curve scale of the cams 38, 43, 54 is different from the cam curve scale of the cam 48.

  Specifically, the die driving cam 38 stops the die 9 at the initial height position in an area of about 10 degrees from the reference position, and slightly reduces the die 9 from the initial height position in an area of about 10 to 20 degrees. Raise and stop die 9 in the region of about 20 to 55 degrees, raise die 9 in the region of about 55 to 90 degrees, stop die 9 in the region of about 90 to 110 degrees, and about 110 to 125 degrees The die 9 is slightly lowered in the region of, the die 9 is stopped in the region of about 125 to 190 degrees, the die 9 is slightly lowered in the region of about 190 to 220 degrees, and the die 9 is moved in the region of about 220 to 295 degrees. The die 9 is stopped, the die 9 is lowered to the initial height position in the region of about 295 to 330 degrees, and the die 9 is stopped in the region of the reference position from about 330 degrees.

  Here, as shown in FIG. 11, the initial height position of the die 9 is a height position at which the upper end of the lower punch 13 fitted into the cavity 10 slightly protrudes from the upper surface of the die 9. Further, when the die 9 is slightly raised from the initial height position in the region of about 10 to 20 degrees from the reference position, the die drive is performed so that the upper end of the lower punch 13 enters the cavity 10 as shown in FIG. A cam 38 is configured.

  The upper ram driving cam 43 sufficiently raises the upper punch 16 from the initial height position in the region of 45 degrees from the reference position, stops the upper punch 16 in the region of about 45 to 115 degrees, and about 115 to 190 degrees. The upper punch 16 is sufficiently lowered in the region of about 90 degrees, the upper punch 16 is stopped in the region of about 190 degrees, the upper punch 16 is further lowered in the area of about 190 to 225 degrees, and the upper punch 16 is moved up in the area of about 225 to 275 degrees The punch 16 is stopped, the upper punch 16 is slightly raised in the region of about 275 to 295 degrees, the upper punch 16 is stopped in the region of about 295 to 330 degrees, and the upper punch 16 is moved from about 330 degrees to the reference position region. It has a shape that raises it to the initial height position.

  The feeder driving cam 48 advances the feeder 11 from the initial position in the region of about 15 degrees from the reference position, stops the feeder 11 in the region of about 15 to 25 degrees, and moves the feeder 11 in the region of about 25 to 60 degrees. Further, the feeder 11 is repeatedly advanced and retracted slightly in the region of about 60 to 105 degrees, the feeder 11 is sufficiently moved back in the region of about 105 to 165 degrees, and the feeder 11 is moved in the region of about 165 to 345 degrees. And the feeder 11 is advanced to the initial position in the region of the reference position from about 345 degrees.

  Here, when the feeder driving cam 48 is rotated about 15 to 25 degrees from the reference position, the feeder 11 is configured to stop before the cavity 10 as shown in FIG.

  The die regulating cam 54 stops the stopper 26 at the initial height position in an area of 90 degrees from the reference position, lowers the stopper 26 in an area of about 90 to 115 degrees, and stops the stopper 26 in an area of about 115 to 155 degrees. The stopper 26 is raised to the initial height position in the region of about 155 to 180 degrees, and the stopper 26 is stopped in the region of the reference position from about 180 degrees.

  6 to 9, the shapes of the cams 38, 43, 48, and 54 are simplified to be circular, but the actual shapes of the cams 38, 43, 48, and 54 are special including a curved portion and a straight portion. Needless to say, it has a shape.

  Next, a procedure for performing molding using the molding apparatus 1 configured as described above will be described with reference to FIGS. 15 shows the actual operation of the die 9 with a two-dot chain line W in the cam curve diagram shown in FIG.

  Here, the height of the contact member 24 is set such that the contact plate portion 25 of the contact member 24 abuts against the stopper 26 when the main shaft 59 (cams 38, 43, 48, 54) is rotated about 100 degrees from the reference position. The position is adjusted in advance by the adjustment handle 27 (see FIGS. 10 and 15). And a molded object is made for every cycle which cams 38, 43, 48, and 54 make one rotation. In order to increase the production efficiency of the molded body, the rotational speed of the main shaft 59 (cams 38, 43, 48, 54) is set to a sufficiently high value, for example, about 80 rpm.

  In the state where the cams 38, 43, 48, 54 are at the reference position, as shown in FIG. 11A, the die 9, the upper punch 16, the feeder 11 and the stopper 26 are formed from the molded body 61 obtained in the previous cycle. It is in the initial setting position in the state extracted from the die 9. That is, the die 9 is at a height position such that the upper end portion of the lower punch 13 fitted in the cavity 10 slightly protrudes from the upper surface of the die 9. As a result, the molded body 61 obtained in the previous cycle can be easily and reliably removed from the cavity 10. The upper punch 16 is at a height position away from the die 9 by a predetermined amount. The feeder 11 is in a position retracted from the cavity 10 by a predetermined amount on the die 9. On the lower punch 13, the molded body 61 produced in the previous cycle is placed.

  When the cams 38, 43, 48, and 54 start to rotate in a predetermined direction from the initial state, the upper punch 16 ascends as shown in FIG. 11 (B), and the feeder 11 moves to the die as shown in FIG. 9 is advanced toward the cavity 10. When the cams 38, 43, 48, and 54 are further rotated, the feeder 11 is temporarily stopped in front of the cavity 10 as shown in FIG. 11 (D), and further, as shown in FIG. Slightly rises, and the upper end of the lower punch 13 slightly retracts into the cavity 10 (see FIG. 15A).

  Thereby, since the feeder 11 does not contact the upper end part of the molded object 61 or the lower punch 13, damage to the molded object 61 or the lower punch 13 can be prevented. Further, when the molded body 61 is extracted from the cavity 10, the molded body 61 swells due to a springback phenomenon, so that the molded body follows the operation of the lower punch 13 even if the upper end portion of the lower punch 13 is retracted into the cavity 10. 61 does not enter the cavity 10, and the molded body 61 is placed on the die 9 so as to cover the cavity 10.

  Then, when the cams 38, 43, 48, 54 are further rotated, as shown in FIGS. 12B and 12C, the feeder 11 advances again on the die 9, and the molded body 61 produced in the previous cycle is obtained. Will start to press. At this time, since the lower punch 13 does not protrude from the upper surface of the die 9, the feeder 11 is not caught by the lower punch 13. In addition, since the feeder 11 is temporarily stopped immediately before touching the molded body 61 as described above, the speed of the feeder 11 can be sufficiently suppressed when the feeder 11 comes into contact with the molded body 61 after resuming advancement. Therefore, the feeder 11 does not give an excessive impact to the molded body 61. For this reason, since the molded object 61 is smoothly pushed by the feeder 11, damage to the molded object 61 etc. can be prevented.

  When the cams 38, 43, 48, and 54 are further rotated in the same direction, as shown in FIG. 12 (D), the feeder 11 further advances on the die 9, so that the molded body 61 is discharged from the cavity 10. And the feeder 11 stops in the position which covers the cavity 10 (refer B of FIG. 15). Thus, since the cavity 10 is covered with the molded body 61 and the feeder 11 without a break, air hardly enters the cavity 10.

  When the cams 38, 43, 48, and 54 are further rotated in the same direction, the die 9 rises to a predetermined height as shown in FIG. 13A, and the material powder J is fed from the feeder 11 into the cavity 10. It is sucked and filled (see B in FIG. 15). At this time, since the feeder 11 is in a stopped state, the material powder J is supplied into the cavity 10 in the downward direction. In addition to this, the shake operation of the feeder 11, that is, the minute forward and backward movement of the feeder 11 is continuously performed (see C in FIG. 15). Therefore, the material powder J can be efficiently and evenly filled into the cavity 10.

  When the cams 38, 43, 48, and 54 are further rotated in the same direction, the stopper 26 is lowered. At this time, since the die 9 is stopped, the stopper 26 comes into contact with the contact member 24. For this reason, the die 9 switches from an operation according to the movement of the die driving cam 38 to an operation according to the movement of the die regulating cam 54. Accordingly, as shown in FIG. 13B, the die 9 is lowered as the stopper 26 is lowered while the contact member 24 is in contact with the stopper 26. Thereby, the overfill operation of the powder filling J is performed (see D in FIG. 15).

  In the overfill operation, after filling the material powder J in a state where the powder filling depth of the cavity 10 is set to be large in advance, the die 9 is lowered so that the powder filling depth of the cavity 10 is slightly reduced. This is a filling operation in which the material powder J is pushed back to the feeder 11. The overfill amount corresponds to the amount X of the die 9 descending at that time (see FIG. 15). By performing such an overfill operation, a gap when the material powder J is filled in the cavity 10 is suppressed, and the material powder J can be filled in the cavity 10 closely.

  When the cams 38, 43, 48, and 54 are further rotated in the same direction, the feeder 11 is moved away from the cavity 10 as shown in FIG. Further, the upper punch 16 starts to descend.

  Then, since the stopper 26 starts to rise after a predetermined time has elapsed, as shown in FIG. 13D, the die 9 rises with the contact member 24 still in contact with the stopper 26. At this time, the die regulating cam 54 is formed so as to be separated from the contact member 24 when the stopper 26 is raised by a predetermined amount. For this reason, the die 9 returns to the operation according to the movement of the die driving cam 38 from the operation according to the movement of the die regulating cam 54, and is in a stopped state. Thereby, the underfill operation of the powder filling J is performed (see D in FIG. 15).

  The underfill operation is a filling operation in which, after the filling of the material powder J into the cavity 10 is finished, the die 9 is raised and the material powder J is submerged from the upper surface of the die 9. The underfill amount corresponds to the amount of increase Y of the die 9 at that time (see FIG. 15). By performing such an underfill operation, the material powder J can be prevented from overflowing from the cavity 10.

  As described above, when the overfill operation and the underfill operation are performed, the abutting member 24 comes into contact with the stopper 26 so that the die 9 is forcibly lowered, stopped, and raised according to the movement of the die regulating cam 54. Since the die 9 is moved up and down by the combination of the die driving cam 38 and the die regulating cam 54 in this way, even if the main shaft 59 is rotated at a high speed, the die 9 hardly shoots. Operates according to a preset movement.

  At this time, when the height position of the contact member 24 is changed by the adjustment handle 27, the cam curve U indicating the movement of the die regulating cam 54 with respect to the cam curve R indicating the movement of the die driving cam 38 is On the curve diagram (see FIG. 10 and FIG. 15), it will be shifted in the vertical direction. For this reason, the amount of displacement until the contact member 24 contacts the stopper 26, in other words, the timing at which the contact member 24 contacts the stopper 26 changes. Further, since the shape of the cam curve U itself does not change, the amount of displacement after the contact member 24 hits the stopper 26 is changed by changing the timing. Accordingly, the overfill amount (see X in FIG. 15) and the underfill amount (see Y in FIG. 15) at that time change, and as a result, the filling amount of the material powder J into the cavity 10 changes.

  When the cams 38, 43, 48, and 54 are further rotated in the same direction, the upper punch 16 enters the cavity 10 as shown in FIG. 14A, and the scraped surface of the material powder J and the lower end surface of the upper punch 16 are brought together. The upper punch 16 is temporarily stopped in the matched state (see E in FIG. 15). At this time, a space is formed in the upper portion of the cavity 10 by the above-described underfill operation (see FIG. 13D), so that the upper punch 16 can easily enter the cavity 10.

  When the cams 38, 43, 48, 54 are further rotated in the same direction, as shown in FIG. 14B, the die 9 is lowered and the upper punch 16 is lowered at the same time. The powder J is compressed (up and down simultaneous pressurization) (see F in FIG. 15). At this time, it is desirable to make the lowering speed of the upper punch 16 faster than the lowering speed of the die 9.

  When the cams 38, 43, 48, 54 are further rotated in the same direction, the die 9 and the upper punch 16 both stop for a predetermined time as shown in FIG. The pressurized state of the powder J is held (pressurized hold) (see G in FIG. 15). At this time, the pressurization hold time is desirably a time that stabilizes the shape, dimensions, and the like of the molded body obtained from the compressed material powder J.

  When the cams 38, 43, 48, and 54 are further rotated in the same direction, as shown in FIG. 14 (D), the above-described air cylinder 17 for depressurization starts from pressing the material powder (molded body) J by the upper punch 16. It switches to pressing of the molded object J by. At this time, the upper ram driving cam 38 is formed so as to perform the operation of slightly raising the upper punch 16 (see H in FIG. 15). However, the actual operation of the upper punch 16 by the operation of the pressure release air cylinder 17 is performed. The height position remains unchanged. By pressing the molded body J with the pressure release air cylinder 17 in this way, it is possible to prevent the molded body J from being damaged due to the distortion received when the material powder J is compressed.

  When the cams 38, 43, 48, and 54 are further rotated in the same direction, the molded body J is extracted from the die 9 by lowering the die 9 (hold down) while continuing the above-described pressure releasing operation. (See H in FIG. 15). Thereafter, when the upper punch 16 is raised, the pressure release operation of the molded body J is released, and the state returns to the state of FIG. Thus, one cycle of the molding operation is completed.

  As described above, in the present embodiment, when the molded body 61 obtained in the previous cycle is dispensed, the feeder 11 is temporarily stopped immediately before the feeder 11 that is moving forward contacts the molded body 61. 11, when the feeder 11 hits the molded body 61 after resuming the forward movement, the impact applied to the molded body 61 is sufficiently mitigated. Further, since the forward movement of the feeder 11 is resumed after the die 9 is raised so that the upper end of the lower punch 13 is retracted into the cavity 10 of the die 9, the feeder 11 is prevented from hitting the lower punch 13. By the above, damage to the molded object 61, the lower punch 13, and the feeder 11 can be prevented reliably.

  Here, in general, when the cam curve is connected at an inflection point, it is necessary to make the tangent slope of the cam curve on both sides equal to the inflection point. It is very difficult to manufacture a cam having a shape in which each cam curve is connected at an inflection point in a state where (is not 0). In the present embodiment, the die 9 is lifted so that the upper end of the lower punch 13 enters the cavity 10 of the die 9 after the feeder 11 is temporarily stopped immediately before the feeder 11 that is moving forward contacts the compact 61. Since the shapes of the die driving cam 38 and the feeder driving cam 48 are configured so that the advancement of the feeder 11 is resumed after the completion, the tangential slope at the inflection point of the cam curve is not concerned at all. The cams 38 and 48 can be manufactured relatively easily.

  Moreover, since the molded body 61 can be smoothly paid out simply by pressing the molded body 61 with the feeder 11 as described above, it is not necessary to provide the feeder 11 with an extra structure for discharging the molded body 61. Thereby, since the structure of the feeder 11 becomes simple, the discharge | payout operation | movement of the molded object 61 can be simplified. Moreover, since the feeder 11 can be reduced in weight, the feeder 11 can be reliably driven at high speed.

  In addition, this invention is not limited to the said embodiment. For example, in the above-described embodiment, when the molded body 61 is discharged, the die 9 is lifted so that the upper end of the lower punch 13 enters the cavity 10 of the die 9 and then the advance of the feeder 11 is resumed. Although the shapes of the die driving cam 38 and the feeder driving cam 48 are set, the forward movement of the feeder 11 is resumed at the same timing as the upper end of the lower punch 13 enters the cavity 10 due to the rise of the die 9. It is good also as a shape.

  In the above embodiment, the lower punch 13 is fixed to the frame 2 and the die 9 is moved up and down relative to the frame 2. However, the die 9 is fixed to the frame 2 and the lower punch 13 is attached to the frame 2. It may be configured to move up and down with respect to the body 2. The point is that the die 9 can be moved up and down relatively with respect to the lower punch 13.

  Further, in the above-described embodiment, the die driving cam 38, the upper ram driving cam 43, the feeder driving cam 48, and the die regulating cam 54 are fixed to the main shaft 59, and the main shaft 59 is rotationally driven by the driving motor 60. However, the die driving cam 38, the upper ram driving cam 43, the feeder driving cam 48, and the die regulating cam 54 may be rotated by different driving motors. In this case, it is necessary to control each drive motor so that these cams 38, 43, 48, 54 rotate synchronously.

  Further, in the molding apparatus 1 of the above embodiment, a plurality of cavities 10 are formed in the die 9 and a plurality of upper punches 16 and a plurality of lower punches 13 are provided corresponding to the cavities 10. Needless to say, the present invention is also applicable to a molding apparatus having only one lower punch 13.

It is sectional drawing which looked at one Embodiment of the shaping | molding apparatus concerning this invention from the front side. It is sectional drawing which looked at the shaping | molding apparatus shown in FIG. 1 from the side surface side. It is sectional drawing which looked at the shaping | molding apparatus shown in FIG. 1 from the upper surface side. It is a front view (a partial cross section is included) of the die set shown in FIG. It is each sectional drawing which shows the adjustment handle and adjustment mechanism shown in FIGS. FIG. 4 is a conceptual diagram of a die drive system including the die drive cam shown in FIGS. 1 to 3. FIG. 4 is a conceptual diagram of an upper ram drive system including the upper ram drive cam shown in FIGS. 1 to 3. FIG. 4 is a conceptual diagram of a feeder drive system including the feeder drive cam shown in FIGS. 1 to 3. FIG. 4 is a conceptual diagram of a stopper drive system including the die regulating cam shown in FIGS. 1 to 3. FIG. 4 is a cam curve diagram showing shapes of a die driving cam, a die driving cam, a feeder driving cam, and a die regulating cam shown in FIGS. 1 to 3. It is process drawing which shows the procedure which shape | molds with the shaping | molding apparatus shown in FIGS. It is process drawing which shows the procedure which shape | molds with the shaping | molding apparatus shown in FIGS. It is process drawing which shows the procedure which shape | molds with the shaping | molding apparatus shown in FIGS. It is process drawing which shows the procedure which shape | molds with the shaping | molding apparatus shown in FIGS. FIG. 11 is a diagram illustrating an actual die operation in the cam diagram shown in FIG. 10.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Molding device, 9 ... Die, 10 ... Cavity, 11 ... Feeder, 13 ... Lower punch, 16 ... Upper punch, 34 ... Die drive system (first cam drive system), 35 ... Upper ram drive system (second cam) Drive system) 36 ... feeder drive system (third cam drive system), 38 ... die drive cam (first cam), 43 ... upper ram drive cam (second cam), 48 ... feeder drive cam (first drive) 3 cams), 59... Spindle (operation synchronization means), 60... Drive motor (operation synchronization means), J.

Claims (2)

A molding apparatus for compressing and molding powder into a predetermined shape,
A die having a cavity filled with the powder;
A lower punch inserted into the cavity from the underside of the die;
An upper punch that is inserted into the cavity from the upper side of the die and compresses the powder filled in the cavity in cooperation with the lower punch;
A feeder for supplying the powder to the cavity;
A first cam drive system having a first cam that moves the die up and down relatively with respect to the lower punch;
A second cam drive system having a second cam for moving the upper punch up and down;
A third cam drive system having a third cam for moving the feeder forward and backward between an initial position away from the cavity and a position covering the cavity ;
Drive synchronization means for synchronously rotating the first cam, the second cam, and the third cam;
The first cam moves the die to the lower punch so that the upper end of the lower punch enters the cavity from a state where the die is relatively stopped with respect to the lower punch within a predetermined angle range. Having a shape such that the die is stopped relative to the lower punch .
In the predetermined angle range, the third cam advances the feeder from the initial position toward the cavity, temporarily stops the feeder before the cavity, and then the die moves against the lower punch. The molding apparatus has a shape that allows the feeder to resume its advancement toward a position that covers the cavity after relatively rising . Said synchronous driving means, said first cam, said second cam and the spindle which is connected to the third cam, claim 1 Symbol placing of the molding device and having a drive motor for rotating the spindle .

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