JP6332213B2 - Powder molding apparatus and method for producing molded body - Google Patents

Description

  The present invention relates to a powder molding apparatus and a method for producing a molded body using the apparatus.

  Various sintered parts are manufactured by press-molding metal powder to sinter it into a compact.

  The above-described pressure molding is performed by using a powder molding apparatus composed of a die having a hollow and an upper punch and a lower punch that slide in the hollow of the die and form a cavity together with the hollow. A powder compact is manufactured by filling the powder and pressing the upper punch for example.

  By the way, Patent Document 1 discloses a molding apparatus that pulls down a die by using an actuator below the die when the molded body is extracted from the die, and this type of molding apparatus is also widely used.

JP-A-6-188138

  When the molding apparatus disclosed in Patent Document 1 is applied, it is necessary to provide an actuator or a mechanism (rod or the like) for connecting the actuator and the die below the die, and this often positions the die from the ground. It has the problem of becoming expensive.

  Also, for the convenience of work, the height of the die must be such that the top surface of the die can be confirmed by the operator, so the pit is dug in the place where the press is installed and the lower part of the press is buried in the ground, There is also a problem that it is necessary to work up.

  Furthermore, when the molded body is extracted from the die, the hold-down load (in order to prevent the molded body from being cracked, the molded body is extracted from the die while the molded body is sandwiched between the lower punch and the upper punch. It is necessary to apply a load to be sandwiched (referred to as a hold-down load).

  In order to keep this holddown load constant, it is necessary to provide and control a load cell, but since the load cell must withstand not only the holddown load but also the molding load, the molding apparatus itself tends to be large, There is also a problem that the molding apparatus is often expensive.

  The present invention has been made in view of the above-mentioned problems, and it is possible to easily take out the produced molded body without increasing the height of the molding apparatus and without digging pits at the place where the press is installed. It is an object of the present invention to provide a powder molding apparatus capable of manufacturing and a method for producing a molded body using the apparatus.

  In order to achieve the above object, a powder molding apparatus according to the present invention includes a die having a hollow, an upper punch and a lower punch that slide in the hollow of the die and form a cavity together with the hollow inner wall, and an upper punch attached thereto. An intermediate platen, an upper platen to which a push rod is attached, a press machine that presses down the upper platen, a link mechanism that connects the upper platen and the intermediate platen, and a first actuator that fixes and releases the link mechanism , A bolster to which a lower punch is attached, and a lower platen to which a die is attached, the lower platen being urged upward from the bolster via a spring, and by lowering of the upper platen and the push rod The lower platen and the die are pushed downward by the push rod, and the lower pan is moved in the hollow as the die moves downward. There is for relatively moving upward.

  The powder molding apparatus of the present invention is a link that connects an upper platen to which a push rod (injection push rod) for pressing a lower platen provided with a die is attached and an intermediate platen provided with an upper punch that slides in the die. A feature is that a configuration in which the first actuator performs fixing and releasing of the mechanism is applied.

  When molding the powder filled in the cavity by pressure, the link mechanism is fixed by the first actuator, the pressing force by the press is transmitted to the upper platen, and the pressing force is transmitted via the fixed link mechanism. The pressure is transmitted to the middle platen, and the pressing force is transmitted to the upper punch provided in the middle platen, whereby the powder is pressed.

  On the other hand, when removing the molded body from the cavity, the link mechanism is released by the first actuator, the pressing force from the press is transmitted to the upper platen, and the link mechanism is released from the fixed release mechanism. Therefore, the pressing force is not transmitted to the medium platen.

  Instead, the pressing force transmitted to the upper platen is transmitted to the lower platen provided with the die by the push rod, and the lower platen and the die are pressed. By pressing the die, the molded body formed on the lower punch in the hollow of the die is exposed on the die, and the molded body can be taken out.

  Examples of the first actuator include an air cylinder mechanism and a hydraulic cylinder mechanism.

  Furthermore, examples of the press machine include a slide, a hydraulic cylinder, and a slide unit body.

  According to the powder molding apparatus of the present invention, the link mechanism is fixed and released by the first actuator at the time of molding the powder and at the time of taking out the molded body, respectively, without increasing the height of the molding apparatus. Moreover, the manufactured molded body can be easily taken out without digging a pit in a place where the press is installed.

  In a preferred embodiment of the powder molding apparatus of the present invention, a second actuator is further provided between the upper platen and the middle platen.

  Similar to the first actuator, the second actuator also includes an air cylinder mechanism, a hydraulic cylinder mechanism, and the like.

  After the molded body is formed in the cavity, the link mechanism is released by the first actuator, and the pressing force by the press machine is transmitted to the lower platen provided with the die via the push rod. Press. At this time, if there is no second actuator, no pressing force acts on the upper punch, but the presence of the second actuator allows the molded body to be pressed with a pressing force smaller than the pressing force at the time of molding by the second actuator. The die can be pressed while pressing.

  The second actuator is provided with, for example, a relief valve, and presses the formed body while keeping a load acting on the upper punch (so-called hold-down load) constant by the second actuator. The pressing force is transmitted to the lower platen provided with the die by the push rod, and the molded body can be exposed from the cavity by pressing the lower platen and the die.

  The present invention also extends to a method for manufacturing a molded body, which is a method for manufacturing a molded body using the powder molding apparatus, and includes a first step of filling a powder in a cavity, A second step of fixing the link mechanism with the first actuator, pressing the upper platen, the middle platen, and the upper punch with a press machine to form the powder in the cavity, and manufacturing a molded body, This is a third step in which the fixing of the link mechanism is released by the actuator, the upper platen is pressed by the press, the lower platen and the die are pressed by the push rod, and the formed body is exposed from the cavity.

  According to the manufacturing method of the present invention, by applying the powder molding apparatus of the present invention, it is possible to easily manufacture a molded body and take out the manufactured molded body from the cavity.

  In the third step, a pressing force (holddown load) lower than the pressing force at the time of molding in the second step is applied to the upper punch from the second actuator, and the compact is pressed with the low pressing force. However, the molded body may be exposed from the cavity.

  As can be understood from the above description, according to the powder molding apparatus and the molded body manufacturing method of the present invention, the link mechanism is fixed and released by the first actuator at the time of molding the powder and at the time of taking out the molded body, respectively. By executing, the manufactured molded body can be easily taken out without increasing the height of the molding apparatus and without digging pits at the place where the press is installed.

It is a schematic diagram of Embodiment 1 of the powder molding apparatus of the present invention. It is the schematic diagram which showed the state which has manufactured the molded object in Embodiment 1 of a powder shaping | molding apparatus. It is the schematic diagram which has made the molded object exposed from the cavity in Embodiment 1 of a powder shaping | molding apparatus, and has taken it out. It is a schematic diagram of Embodiment 2 of a powder shaping | molding apparatus. It is the schematic diagram which showed the state which has manufactured the molded object in Embodiment 2 of a powder shaping | molding apparatus. It is the schematic diagram which showed the state which has exposed the molded object from the cavity in Embodiment 2 of a powder shaping | molding apparatus. It is a schematic diagram which has made the molded object exposed from the cavity in Embodiment 2 of a powder shaping | molding apparatus, and has taken it out.

  Embodiments 1 and 2 of the powder molding apparatus of the present invention and a method for producing a molded body will be described below with reference to the drawings.

(Embodiment 1 of powder molding apparatus and method for producing molded body)
FIG. 1 is a schematic diagram of Embodiment 1 of the powder molding apparatus of the present invention, and FIG. 2 is a schematic diagram showing a state in which a molded body is manufactured in Embodiment 1 of the powder molding apparatus. 3 is a schematic view in which the molded body is exposed from the cavity in the first embodiment of the powder molding apparatus, and is ready to be taken out.

  The illustrated powder molding apparatus 200 includes a press machine 70 mounted on a frame 100, a die 10, an upper punch 20 and a lower punch 30, an intermediate platen 50 to which the upper punch 20 is attached, an upper platen 40, an upper platen 40, and an intermediate platen. 50 includes a link mechanism 90 for connecting 50, a first actuator 80 for fixing and releasing the link mechanism 90, a bolster 61 to which the lower punch 30 is attached, and a lower platen 60 to which the die 10 is attached.

  The lower punch 30 and the upper punch 20 are slidable in the hollow 11 of the die 10. In FIG. 1, the metal powder F that is pressure-molded in the cavity defined by the hollow 11 and the lower punch 30 is formed. Filled.

  An upper punch 20 is attached to the lower surface of the middle platen 50 via a retainer 53, and a first guide post 54 is attached to the upper surface of the middle platen 50.

  Further, a stopper 51 that holds the fixed posture of the link mechanism 90 and a first actuator mounting portion 52 are provided on the upper surface of the middle platen 50.

  The upper platen 40 is provided with a first guide bush 40 a through which the first guide post 54 penetrates. A slider 72 constituting a press machine 70 is mounted on the upper surface of the upper platen 40. A push rod 41 is attached to the lower surface.

  A lower punch 30 is attached to the upper surface of the bolster 61 via a retainer 63, and a second guide post 62 is further attached.

  The lower platen 60 is provided with a second guide bush 60 a through which the second guide post 62 passes, and the die 10 is attached to the center of the lower platen 60.

  A spring 64 is disposed around the second guide post 62 protruding from the upper surface of the bolster 61, and the spring 64 supports the lower platen 60 while urging it upward.

  The press machine 70 includes a hydraulic cylinder 71 that slides a piston 71a and a slider 72 to which a pressing force is applied by the piston 71a.

  The constituent members of the powder molding apparatus 200 are accommodated in the frame 100, the hydraulic cylinder 71 constituting the press machine 70 is fixed on the top surface of the frame, and the piston 71a penetrates the top surface and enters the inside of the frame 100. The overhang and its tip are fixed to the slider 72.

  The link mechanism 90 includes two links 91, three links 91 that connect the links 91 to the upper platen 40 and the middle platen 50, and further connect the two links 91 to each other.

  The first actuator 80 includes an air cylinder 81 and a piston 82, and the tip of the piston 82 is attached to a central joint 92.

  The state shown in FIG. 1 shows a state in which the piston 82 moves to the left end of the air cylinder 81 (Z1 direction), and the two links 91 and 91 are fixed linearly.

  As shown in FIG. 1, when the metal powder F is filled in the cavity and the link mechanism 90 is fixed linearly by the first actuator 80, the press machine 70 is operated and the piston 71a is moved as shown in FIG. A sliding force is applied to the upper platen 40 via the slider 72.

  The upper platen 40 to which the pressing force P is applied depresses the middle platen 50 and the upper punch 20 fixed to the lower surface thereof via the link mechanism 90 fixed linearly by the first actuator 80 (in the X1 direction). ), The metal powder F is molded in the cavity defined by the die 10 and the lower punch 30, and the molded body C is manufactured.

  After the molded body C is manufactured, the molded body C is then taken out from the cavity.

  Specifically, as shown in FIG. 3, the piston 82 is moved rightward (Z2 direction) in the air cylinder 81 of the first actuator 80, and the two links 91, 91 constituting the link mechanism 90 are moved. It is rotated around the joint 92 (Y1 direction), and the linear fixing of the link mechanism 90 is released.

  When the press machine 70 is operated together with the unlocking of the link mechanism 90 (pressing force P ′), the lower platen 60 and the die 10 are connected to the spring 64 via the push rod 41 while the pressing from the upper press 20 to the molded body C is released. Press against the energizing of (X2 direction).

  When the die 10 is pressed, the molded body C in the cavity moves upward relative to the die 10 (X3 direction), the molded body C is exposed to the outside of the cavity, and the molded body C is taken out. Is possible.

  As described above, according to the powder molding apparatus 200, the link mechanism 90 is fixed and released by the first actuator 80 when the metal powder F is molded and when the molded body C is taken out. The manufactured molded body can be easily taken out without increasing the height of 200 and without digging pits at the place where the press is installed.

(Embodiment 2 of powder molding apparatus and method for producing molded body)
FIG. 4 is a schematic diagram showing a second embodiment of the powder molding apparatus, and FIG. 5 is a schematic diagram showing a state in which a molded body is manufactured in the second embodiment of the powder molding apparatus. FIG. 6 is a schematic view showing a state in which the molded body is exposed from the cavity in the second embodiment of the powder molding apparatus, and FIG. 7 shows the cavity in the second embodiment of the powder molding apparatus. It is the schematic diagram which is exposed from and is made into the state which can be taken out.

  A powder molding apparatus 200A shown in FIG. 4 is an apparatus in which the upper platen 40 and the middle platen 50 are further connected to the powder molding apparatus 200 by two second actuators 80A.

  As shown in FIG. 4, each of the two second actuators 80A includes an air cylinder 81A and a piston 82A, and the piston 82A is arranged so as to move up and down in the vertical direction.

  The second actuator 80A is provided with a relief valve (not shown), and presses the molded body C while maintaining a constant load (so-called hold-down load) acting on the upper punch 20 by the second actuator 80A (see FIG. 6), on the other hand, the pressing force from the press machine 70 is transmitted to the lower platen 60 provided with the die 10 by the push rod 41 to expose the molded body C to the outside of the cavity.

  That is, the second actuator 80A is an actuator for applying a certain hold-down load to the molded body C when the molded body C is taken out.

  Here, the manufacturing method of the molded object using the powder molding apparatus 200A will be outlined.

  As shown in FIG. 5, the pressing machine 70 is operated, and the pressing force P is applied to the middle platen 50 and the upper punch 20 fixed to the lower surface thereof via the link mechanism 90 fixed linearly by the first actuator 80. Is pressed down (X1 direction), and the molded body C is manufactured in the cavity defined by the die 10 and the lower punch 30.

  Next, as shown in FIG. 6, the piston 82 is moved rightward in the air cylinder 81 of the first actuator 80 (Z2 direction), and the two links 91, 91 constituting the link mechanism 90 are connected to the joint 92. It is rotated around (Y1 direction), and the linear fixing of the link mechanism 90 is released.

  Further, the piston 82A is moved upward in the air cylinder 81A of the second actuator 80A (Z4 direction), and a certain hold-down load is applied to the middle platen 50 from the second actuator 80A (X5 direction). A constant hold-down load is applied to the upper punch 20 via the platen 50 (X4 direction).

  In a state where the molded body C is held by this constant holddown load, the pressing force P ′ from the press machine 70 presses the lower platen 60 and the die 10 against the bias of the spring 64 via the push rod 41. (X2 direction).

  As shown in FIG. 6, when the die 10 is pressed, the molded body C in the cavity moves upward relative to the die 10 (X3 direction).

  As shown in FIG. 7, the piston 82A is further moved upward in the air cylinder 81A of the second actuator 80A (Z4 direction), and the middle platen 50 and the upper punch 20 are moved upward (X6 direction). The molded body C exposed to the outside of the cavity can be taken out.

  According to the powder molding apparatus 200 </ b> A, in addition to the effect obtained when the powder molding apparatus 200 is used, the molded body C can be prevented from cracking when the molded body C is extracted from the die 10.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  DESCRIPTION OF SYMBOLS 10 ... Die, 11 ... Hollow, 20 ... Upper punch, 30 ... Lower punch, 40 ... Upper platen, 40a ... 1st guide bush, 41 ... Push rod, 50 ... Medium platen, 51 ... Stopper, 52 ... 1st Actuator mounting portion, 53 ... retainer, 54 ... first guide post, 60 ... lower platen, 60a ... second guide bush, 61 ... bolster, 62 ... second guide post, 63 ... retainer, 64 ... spring, 70 ... press machine, 71 ... hydraulic cylinder, 71a ... piston, 72 ... slider, 80 ... first actuator (air cylinder), 81 ... air cylinder, 82 ... piston, 80A ... second actuator (air cylinder), 81A ... Air cylinder, 82A ... piston, 90 ... link mechanism, 91 ... link, 92 ... joint, 100 ... frame, 2 0,200A ... powder molding apparatus, F ... metal powders (powder), C ... moldings

Claims (4)

A die having a hollow;
An upper punch and a lower punch that slide in the hollow of the die and form a cavity with the hollow inner wall;
A medium platen with an upper punch attached,
An upper platen with a push rod attached;
A press that presses the upper platen;
Comprising a two links, one link connecting the upper-platen and the other ring, the other link, and a link mechanism connecting the middle and one link-platen,
Fixed and the two link fixes the two links to be linearly aligned, and unlocking for release the two rings which are arranged in a straight line, a first actuator for performing,
A bolster with a lower punch attached,
A lower platen to which a die is attached, the lower platen being biased upward from the bolster via a spring, and
A powder molding apparatus in which the lower platen and the die are pushed downward by the push rod by the lowering of the upper platen and the push rod, and the lower punch is relatively moved upward in the hollow as the die moves downward.   The powder molding apparatus according to claim 1, further comprising a second actuator between the upper platen and the middle platen. A method for producing a molded body using the powder molding apparatus according to claim 1 or 2,
A first step of filling the cavity with powder;
The two links of the link mechanism are fixed in a straight line by the first actuator, and the upper platen, the middle platen, and the upper punch are pressed by the press machine to form the powder in the cavity, thereby producing a molded body. The second step,
Release the linear fixing of the two links of the link mechanism with the first actuator, press the upper platen with the press, and press the lower platen and die with the push rod to expose the molded body from the cavity. The manufacturing method of the molded object which consists of a 3rd step. A method for producing a molded body using the powder molding apparatus according to claim 2,
In the third step, a pressing force lower than the pressing force at the time of molding in the second step is applied to the upper punch from the second actuator, and the compact is removed from the cavity while pressing the compact with the low pressing force. The manufacturing method of the molded object of Claim 3 made to expose.

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