JP2006239752A - Green compact compacting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To measure the correct weight of powder when compacting the powder by a green compact compacting device. <P>SOLUTION: A frame body 44 is placed on a saucer 116 in a load cell 46 via a placing plate 82. When the frame body 44 is released from the suspension of a guide rail 68, the total weight of the frame body 44 and the placing plate 82 is added to the load cell 46 as a load. In this state, iron based alloy powder is introduced into the frame body 44, and the additional weight displayed by the load cell 46 is read out, thus the weight of the iron based alloy powder is obtained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a compacting apparatus that compresses powder to produce a compact.

  As one type of compacting apparatus that compresses metal powder or the like using a mold, powder is supplied from a hopper to the frame, and the frame is vibrated on the cavity of the mold, thereby 2. Description of the Related Art A compacting apparatus for transferring powder from the opened lower surface to the cavity is widely used. The powder thus transferred to the cavity is compression-molded as the upper punch is inserted into the cavity, for example.

  By the way, if the amount of powder supplied from the hopper is different every time the hopper is supplied, the dimensional accuracy of the compression molded body is lowered. In order to avoid the occurrence of such a problem, it is originally desirable to measure the weight of the powder supplied to the frame each time, and to keep the weight of the powder and thus the supply amount as constant as possible.

  Examples of this type of powder amount measuring apparatus include the apparatus described in Patent Document 1. In this apparatus, the volume of powder necessary for coating is controlled to be constant.

  Patent Document 2 proposes to construct a powder amount measuring device so that the apparent density of the metal powder for powder forming can be sequentially measured.

JP 2000-61368 A JP-A-8-277401

  Since the apparatus described in Patent Document 1 controls the powder volume to be constant, for example, when the type of the raw material powder is changed, there is a disadvantage that the powder is not supplied at a desired weight.

  Moreover, in the apparatus described in Patent Document 2, it is necessary to discharge the metal powder from the frame when measuring the weight of the metal powder. That is, in the apparatus described in Patent Document 2, the weight of the powder supplied to the frame cannot be measured without being discharged from the frame, and for this reason, the powder transferred from the frame to the cavity cannot be accurately measured. There is a problem that it is difficult to grasp the weight.

  The present invention has been made to solve the above-described problems, and it is possible to reliably measure the weight of the powder supplied to the frame. For this purpose, the dimensional accuracy of the green compact is easily improved. An object of the present invention is to provide a compacting device that can be made to operate.

In order to achieve the above object, the present invention, after supplying powder to a frame having an open bottom surface, horizontally displaces the frame to transfer the powder from the open bottom surface to a cavity, A compacting device for producing a compression molded body by compressing powder filled in a cavity,
Frame horizontal displacement means for displacing the frame in the horizontal direction;
A rod locking member which is provided on the frame body and locks the head of the rod of the frame horizontal displacement means to prevent the rod from coming off;
A guide member for guiding the frame when the frame is displaced;
A fixed portion and an engaging portion, wherein the fixed portion is fixed to the frame body and is slidably engaged with the guide member to suspend the frame body on the guide member; and Suspension means in which the engaging portion approaches or separates from the guide member under the resilient action of the resilient member;
A frame vertical displacement means for suspending the frame body from the suspension of the suspension means, while suspending the frame body on the suspension means by displacing the frame body vertically upward;
Weight measuring means for measuring the weight of the frame released from suspension by the suspension means and the powder supplied into the frame;
It is characterized by having.

  In the present invention, the weight of the powder supplied into the frame is measured by the weight measuring means. For this reason, since the weight of the powder can be accurately measured, a certain amount of powder can be supplied to the cavity every time the compression molded body is produced, and thus a compression molded body with good dimensional accuracy is obtained. be able to.

  The weight of the powder is measured in a state where the suspension of the frame body to the guide member by the suspension means is released.

  At this time, since the head of the rod is locked to the rear end of the frame, when measuring the weight of the frame and powder, the rod, and thus the horizontal displacement means of the frame is attached to the frame. It is avoided to descend following.

  Here, the frame vertical displacement means is installed on, for example, a cylinder having a rod that moves forward and backward in the horizontal direction, a movable plate that supports a mounting plate on which the frame is mounted from below, and the rod. In addition, a cam having an inclined portion and a roller installed on the movable platen and placed on the inclined portion may be a basic configuration. In this case, if the rod is moved back and forth in the horizontal direction, the roller is displaced along the inclined portion. Following this, the mounting plate is displaced in the vertical direction together with the movable platen.

  It is preferable to provide a molded body conveying member for conveying the compression molded body at the tip of the frame. Thereby, it becomes easy to convey a compression molding to the station which performs the next process.

  In this case, the rear end portion of the molded body conveying member is locked by a locking portion provided at the front end of the frame body to prevent the molded body conveying member from coming off. Thereby, when measuring the weight of a frame and powder, it is avoided that a molded object conveyance member follows a frame and falls.

  According to the present invention, the weight of the powder supplied into the frame is measured by the weight measuring means. For this reason, the weight of the powder is accurately measured, and eventually, when producing the compression molded body, the powder can be supplied to the cavity in a certain amount. In this way, since a certain amount of powder is supplied to the cavity, a compression molded body with good dimensional accuracy can be easily obtained.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a compacting apparatus according to the present invention will be described in detail with reference to the accompanying drawings. In the present embodiment, a case where the gear 10 shown in FIG. 1 is compression-molded from iron-based alloy powder will be described as an example.

  First, the gear 10 which is a compression molded body will be described. A through hole 12 is provided at the center of the gear 10, and an inner tooth 14 is provided on the inner peripheral wall of the through hole 12. Further, on each end face of the gear 10, a lower rib 16 and an upper rib 18 are formed in the vicinity of the through hole 12 so as to ensure strength.

  Further, the gear 10 is provided with three boss portions 20a to 20c so as to protrude from the side peripheral wall, and external teeth 22a to 22c are formed on the boss portions 20a to 20c. That is, the gear 10 has the inner teeth 14 and the outer teeth 22a to 22c.

  Next, a compacting device for compacting and producing the gear 10 will be described.

  2 to 4 are a main part schematic perspective view main part schematic side view and an upper schematic plan view of the compacting apparatus according to the present embodiment, respectively. The compacting apparatus 30 includes a gantry 32, a die 34 attached to the gantry 32, a lower punch 38 that forms a cavity 36 (see FIGS. 2 and 4) together with the die 34, Frame body displacement cylinder 40 installed on the end face, frame body 44 locked to the tip of rod 42 constituting frame body displacement cylinder 40, frame body 44 and iron supplied to frame body 44 A load cell 46 (see FIG. 3), which is a weight measuring means for measuring the total weight of the system alloy powder, and a frame vertical displacement means 48 for placing and separating the frame body 44 on the load cell 46 are provided. Further, the compacting apparatus 30 includes a hopper for storing the iron-based alloy powder supplied to the frame body 44, and an upper punch disposed at a position facing the lower punch 38. (Both not shown).

  As shown in FIG. 2, the gantry 32 includes four leg portions 49 and a molding board 50 that is supported by the leg portions 49 and fitted with the die 34. A frame displacing cylinder 40 is positioned and fixed to the left of the upper end surface in FIG. 2 of the molding machine 50, and the frame 44 is gently attached to the tip of the rod 42 constituting the frame displacing cylinder 40. It is locked.

  As shown in FIG. 4, both ends of the tip of the rod 42 are inclined at a predetermined angle. For this reason, inclined portions 52 are provided on both sides. On the other hand, a locking member 54 having a side surface facing the inclined portion 52 inclined at an angle corresponding to the angle of the inclined portion 52 is disposed at the rear end portion of the frame body 44. By surrounding the inclined portion 52 with play, the rod 42 is prevented from coming off from the locking member 54.

  Both the lower surface and the upper surface of the frame 44 are open. As will be described later, the iron-based alloy powder is introduced from the opening of the upper surface, and the iron-based alloy powder is transferred to the cavity 36 from the opening of the lower surface.

  Above the frame body displacement cylinder 40, the hopper (not shown) that contains iron-based alloy powder as a raw material of the gear 10 is disposed. The iron-based alloy powder is supplied from the hopper to the frame body 44 through a supply pipe (not shown).

  Further, the front end surface of the frame body 44 has a substantially U-shaped gripping portion 56 and a vertical wall portion 58 rising vertically from the gripping portion 56 (a molded article transporting jig). 60 are connected. That is, two U-shaped grooves 62 are formed in the vertical wall portion 58 of the payout jig 60, and the tip of the pin 64 that passes through the U-shaped groove 62 is the front end of the frame body 44. Buried in the surface. A washer 66 wider than the U-shaped groove 62 is interposed between the pin 64 and the vertical wall portion 58, and the vertical wall portion 58 is blocked by the washer 66 (see FIG. 2). A slight play is provided between the washer 66 and the vertical wall portion 58.

  Two guide rails 68 (guide members) are laid on the upper end surface of the molding machine 50 along the longitudinal direction of the molding machine 50, and the frame body 44 is interposed between the guide rails 68. Yes.

  As shown in FIGS. 2 and 3, a suspension roller unit 70 for suspending the frame body 44 on the guide rail 68 is fixed to the side surface of the frame body 44. The suspension roller unit 70 is provided at a stay (fixed portion) 72 fixed to a side surface of the frame body 44, a shaft portion 74 through which the through hole of the stay 72 is passed, and a tip portion of the shaft portion 74. And a roller 76 as an engaging portion slidably engaged with the guide rail 68, and a coil spring 80 as a resilient member between the large-diameter head portion 78 of the shaft portion 74 and the stay 72. Is intervening. When the upper end surface of the mounting plate 82 shown in FIG. 5 is at the same height as the upper end surface of the molding machine 50, the coil spring 80 is compressed by the large-diameter head portion 78 of the shaft portion 74 and the stay 72. Thus, the large-diameter head 78 and thus the shaft 74 are elastically biased upward. Accordingly, the roller 76 connected to the shaft portion 74 via the bracket 84 approaches the lower end surface of the ceiling plate 86 constituting the guide rail 68 and finally comes into contact with the lower end surface.

  As shown in FIG. 5, a hole 88 is provided in the molding machine 50, and the die 34 is fitted in the hole 88. A through hole 90 is provided in the die 34, and the lower punch 38 is inserted into the through hole 90 so as to be displaceable. A core rod 94 positioned and fixed is inserted into a hole 92 provided in the center of the lower punch 38, and the side peripheral portion of the core rod 94, the inner peripheral portion of the die 34, and the lower punch 38 are A cavity 36 is formed by the upper end surface.

  Further, an upper punch (not shown) that can approach and separate from the lower punch 38 under the action of a displacement mechanism (not shown) is disposed at a position facing the lower punch 38.

  On the other hand, the frame vertical displacement means 48 is disposed on the left side in FIG. 5, that is, below the frame 44. In this case, the frame vertical displacement means 48 includes a vertical displacement cylinder 96 and a substantially T-shaped movable plate 97 disposed on both sides of the compacting device 30 on the lower end surface side of the mounting plate 82. 97, a roller support member 98 connected to each movable platen 97, and a roller 100 rotatably supported by the roller support member 98. When the two movable plates 97 and 97 are positioned at the highest point, the mounting plate 82 is supported only by these movable plates 97 and 97.

  In FIG. 5, reference numeral 101 indicates a columnar rail that is guided when the movable platen 97 is raised and lowered.

  A flat plate 104 is connected to the tip of the rod 102 of the vertical displacement cylinder 96, and this flat plate 104 is slidably supported on a guide rail 108 fixed to the frame 106 via a support member 105. Yes. On the upper end surface of the flat plate 104, there are provided cams 110 having inclined grooves 109 that rise on both sides as they approach the vertical displacement cylinder 96. The roller 100 is inserted into the inclined groove 109 of the cam 110 from the side, and slides along the bottom surface of the inclined groove 109.

  The mounting plate 82 is inserted into an opening 112 provided in the molding machine 50. On the lower end surface side of the mounting plate 82, a tray 116 for the load cell 46 is disposed between the two movable plates 97. That is, the tray 116 is disposed between the movable plates 97 and 97 so as to be separated from the movable plates 97 and 97 at a predetermined interval.

  The powder compacting apparatus 30 according to the present embodiment is basically configured as described above, and the function and effect thereof will be described next.

  First, as shown in FIG. 6, the rod 42 of the frame displacement cylinder 40 is set to the maximum retracted position, and the rod 102 of the vertical displacement cylinder 96 is moved backward. At this time, the rod 102 is guided to the guide rail 108 via the support member 105.

  As the rod 102 moves backward, the cam 110 on the flat plate 104 connected to the rod 102 moves backward, and as a result, the roller 100 slides down along the inclined groove 109. Along with this, the roller support member 98 is lowered, and as a result, the movable platen 97 is guided by the columnar rail 101 and lowered. Following this lowering, the mounting plate 82 supported by the movable plates 97 is lowered.

  When the mounting plate 82 is lowered, the frame body 44 placed on the mounting plate 82 is also lowered. For this reason, the stay 72 connected to the side surface of the frame body is also lowered and extended until the coil spring 80 has a natural length. As a result, the frame body 44 is released from the suspension of the guide rail 68.

  The lowered mounting plate 82 is mounted on the tray 116 of the load cell 46. Thereafter, as the rod 102 is further retracted, the movable plates 97 and 97 are further lowered, whereby the mounting plate 82 is released from the support of the movable plate 97 and is supported only by the tray 116.

  As a result, a load corresponding to the total weight of the mounting plate 82 and the frame body 44 is applied to the load cell 46. The rod 42 and the payout jig 60 are only loosely locked in a state where there is play in the frame body 44. Since this play exists, the rod 42 and the dispensing jig 60 do not descend together with the frame body 44.

  In this state, iron-based alloy powder is introduced from the hopper through the supply pipe to the frame body 44 located at the rearmost end. A further load is applied to the load cell 46 as the iron-based alloy powder is supplied. If the new load is displayed on a scale, for example, and read, the weight of the iron-based alloy powder can be accurately measured.

  Thus, in this Embodiment, the exact weight of an iron-type alloy powder can be measured. For this reason, iron-based alloy powder can be accommodated in the frame 44 in a fixed amount.

  Next, the vertical displacement cylinder 96 is moved forward. As a result, as shown in FIG. 5, the roller 100 rises along the inclined groove 109 of the cam 110 and rides on the horizontal bottom surface in the inclined groove 109. In addition, the upper end surface of the mounting plate 82 and the upper end surface of the molding plate 50 have the same height, and the coil spring 80 is compressed by the large diameter head 78 and the stay 72 accordingly. For this reason, the shaft portion 74 constituting the suspension roller unit 70 is elastically biased upward, and the roller 76 contacts the lower end surface of the ceiling plate 86 of the guide rail 68 following this. As a result, the frame body 44 is suspended from the guide rail 68.

  Thereafter, the frame body displacement cylinder 40 is energized, and the rod 42 moves forward to the left in FIG. 2, in other words, toward the cavity 36. When the head of the rod 42 comes into contact with the rear end surface of the frame body 44, the frame body 44 also starts moving forward, and when the tip of the frame body 44 comes into contact with one end surface of the vertical wall portion 58 of the dispensing jig 60. The dispensing jig 60 also starts moving forward.

  When the frame body 44 reaches and vibrates above the right end portion of the cavity 36 in FIG. 2, the lower end surface of the frame body 44 is open, so that the iron-based alloy powder starts to fall into the cavity 36. That is, the iron-based alloy powder starts to be transferred to the cavity 36.

  In the rod 42, the connecting portion of the frame body 44 with the rod 42 finally passes above the left end portion of the cavity 36 in FIG. 2, and is set to a preset forward end position, in other words, a displacement end point of the rod 42. It is displaced until it reaches As a result, the iron-based alloy powder is transferred throughout the cavity 36.

  The rod 42 moves backward to the initial position after reaching the displacement end point. Then, under the action of the displacement mechanism, the upper punch is displaced downward in FIG. 2 and inserted into the cavity 36, whereby the iron-based alloy powder is pressed by the lower punch 38 and the upper punch.

  The displacement mechanism acts to displace the upper punch further downward. For this purpose, the iron-based alloy powder is compressed, and as a result, the gear 10 shown in FIG. 1 is formed.

  After a predetermined time has elapsed, the upper punch is displaced in the direction of separating from the cavity 36 (upward in FIG. 2) under the action of the displacement mechanism. Thereafter, the lower punch 38 is displaced upward, and the gear 10 is displaced upward accompanying the displacement. The gear 10 is finally exposed from the cavity 36.

  In this state, the frame body displacement cylinder 40 is urged again, and the rod 42, and thus the frame body 44, moves forward to the left in FIG. As a result, the gear 10 is gripped by the gripping portion 56 of the payout jig 60, and finally the gear 10 is conveyed to the forward end position of the payout jig 60 (see FIG. 4).

  The gear 10 is conveyed to a station where the next processing is performed by a robot (not shown).

  In the above-described embodiment, the case where the gear 10 is provided from the iron-based alloy powder has been described as an example. However, the present invention is not particularly limited to this case, and other compression molding is performed from other metal powder. You may make a body. The raw material powder is not limited to metal powder, and may be ceramic powder.

It is a whole schematic perspective view of the gear produced with the compacting device concerning this embodiment. It is a principal part schematic perspective view of the compacting apparatus which concerns on this Embodiment. It is a principal part schematic side view of the compacting apparatus of FIG. It is an upper schematic plan view of the compacting apparatus of FIG. It is a partial cross section side view which shows the state which the frame is raising. It is a partial cross section side view which shows the state which the frame is falling.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Gear 14 ... Internal tooth 20a-20c ... Boss part 22a-22c ... External tooth 30 ... Compaction molding apparatus 32 ... Mount 34 ... Die 36 ... Cavity 38 ... Lower side punch 40 ... Frame body displacement cylinder 42 ... Rod 44 ... Frame 46 ... Load cell 48 ... Frame vertical displacement means 50 ... Molding plate 52 ... Inclined part 54 ... Locking member 56 ... Grip part 60 ... Discharge jig 64 ... Pins 68, 108 ... Guide rail 70 ... Suspension roller Units 76, 100 ... Roller 80 ... Coil spring 94 ... Core rod 96 ... Vertical displacement cylinder 97 ... Movable plate 109 ... Inclined groove 110 ... Cam 116 ... Receptacle

Claims (3)

After the powder is supplied to the frame having the lower surface opened, the frame is displaced in the horizontal direction, the powder is transferred to the cavity from the opened lower surface, and the powder filled in the cavity is compressed to form a compression molded body. A compacting device for producing
Frame horizontal displacement means for displacing the frame in the horizontal direction;
A rod locking member which is provided on the frame body and locks the head of the rod of the frame horizontal displacement means to prevent the rod from coming off;
A guide member for guiding the frame when the frame is displaced;
A fixed portion and an engaging portion, wherein the fixed portion is fixed to the frame body and is slidably engaged with the guide member to suspend the frame body on the guide member; and Suspension means in which the engaging portion approaches or separates from the guide member under the resilient action of the resilient member;
A frame vertical displacement means for suspending the frame body from the suspension of the suspension means, while suspending the frame body on the suspension means by displacing the frame body vertically upward;
Weight measuring means for measuring the weight of the frame released from suspension by the suspension means and the powder supplied into the frame;
The compacting apparatus characterized by having.   2. The compacting apparatus according to claim 1, wherein the frame vertical displacement means includes a cylinder having a rod that moves forward and backward in a horizontal direction, and a movable platen that supports a placement plate on which the frame is placed from below. A cam installed on the rod and formed with an inclined portion; and a roller installed on the movable plate and mounted on the inclined portion, and the rod moves forward and backward in the horizontal direction. The compacting apparatus according to claim 1, wherein the roller is displaced along the inclined portion, whereby the mounting plate is displaced in the vertical direction together with the movable platen.   3. The compacting apparatus according to claim 1, further comprising a molded body transporting member that transports the compression molded body at a front end of the frame body, and a rear end portion of the molded body transporting member at a front end of the frame body. A compacting apparatus, wherein the molded article conveying member is prevented from coming off by being locked by a provided locking portion.

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