JP2007260744A - Rotary press apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary press apparatus capable of inhibiting a powder-molded product from being cracked. <P>SOLUTION: The rotary press apparatus 1 is equipped with: pressurizing rollers 26, 31 arranged in order along the circular orbit; and a pressurization maintaining means composed of a hold-down cylinder 40, an energizing cam 41 and a lower cam, wherein the powder-molded product W is formed by fitting the upper punch 9a into a die 10 by means of the pressurizing rollers 26, 31 to pressurize the powder material. The pressurization maintaining means energizes the upper punch holder 9 toward a die 10 side while making a lower punch holder 11 ascend, thereby ejecting the powder-molded product W from the die 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotary press apparatus.

One of the press devices that can efficiently press the powder material to obtain a powder molded product is a rotary press device (see, for example, Patent Document 1 below). A rotary press apparatus described in Patent Document 1 below obtains a powder molded product by pressing a plurality of powder materials in a die arranged on a rotary table with an upper punch and a lower punch, respectively.
JP-A-8-197294

  In the rotary press apparatus described in Patent Document 1, when a powder material is pressed to obtain a powder molded product and taken out from the die, the powder molded product may crack.

  Therefore, an object of the present invention is to provide a rotary press device capable of suppressing cracks from entering into a powder molded product.

  The rotary press device of the present invention has an upper disc, an intermediate disc, and a lower disc, which are sequentially provided at predetermined intervals so as to rotate synchronously about the main axis, and the main axis in the intermediate disc. A die provided at a predetermined interval along a circular orbit to be performed, an upper punch held in an upper punch holder provided at a position corresponding to the die of the upper disk, and a lower circle A lower punch that is held in a lower punch holder provided at a position corresponding to the die of the plate and is inserted into the die, and compresses the powder material by the upper punch, the die, and the lower punch to produce a powder molded product A rotary press device to be manufactured, comprising pressurizing means and pressurization maintaining means arranged in order along a circular orbit, and the pressurizing means presses a powder material by inserting an upper punch into a die to make a powder Molded product and The pressure maintaining means pressurizes the powder material to form a powder molded product, and then urges the upper punch holder toward the die side while raising the lower punch holder to remove the powder molded product. Eject from the die.

  According to the present invention, after pressing the powder material into a powder molded product, the upper punch holder is biased toward the die side while raising the lower punch holder, so the pressure applied to the powder molded product is rapidly increased. The powder molded product can be discharged from the die without opening it.

  Further, in the rotary press device of the present invention, the pressing means includes an upper roller disposed on the opposite side of the die with the upper punch holder interposed therebetween, and a lower roller disposed on the opposite side of the die with the lower punch holder interposed therebetween. It is also preferable to have Since the upper and lower rollers are provided and pressure is applied to the lower punch holder and the upper punch holder by these upper and lower rollers, the force can be transmitted more smoothly.

  In the rotary press device of the present invention, the pressure maintaining means is disposed on the opposite side of the die with the biasing cam disposed on the opposite side of the die with the upper punch holder interposed therebetween. It is also preferable to have a lower cam and a hold-down cylinder that urges the urging cam toward the upper punch holder. The position of the upper and lower punch holders is adjusted by the upper and lower cams, and the biasing cam is biased by the hold-down cylinder, so that the pressure corresponding to the movement of the lower punch holder can be transmitted to the upper punch holder.

  In the rotary press apparatus of the present invention, the holddown cylinder is preferably an air cylinder. Since the air cylinder can transmit the reaction force according to the external force to the biasing cam, the hold-down cylinder can be configured with a simple structure.

  Further, the rotary press device of the present invention includes an adjustment cam for raising the upper punch holder after the pressurizing means along the circular track, and the adjustment cam has an inclined surface along the circular track, and can advance and retreat along the circular track. It is also preferable that they are arranged as described above. Since the adjustment cam is configured to be able to advance and retract along the circular orbit, the rising position of the upper punch holder can be easily adjusted.

  According to the present invention, since the powder molded product can be discharged from the die without rapidly releasing the pressure applied to the powder molded product, it is possible to suppress cracks from entering the powder molded product.

  The knowledge of the present invention can be easily understood by considering the following detailed description with reference to the accompanying drawings shown for illustration only. Subsequently, embodiments of the present invention will be described with reference to the accompanying drawings. Where possible, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  A rotary press apparatus according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of a rotary press apparatus D. In the rotary press apparatus D, a frame 2 is fixed on a base 1, and a main shaft 3 is fixed perpendicularly to the upper surface of the frame 2. The main shaft 3 includes a lower main shaft 3A and an upper main shaft 3B that is screwed onto the upper portion of the lower main shaft 3A.

  A rotating cylinder 4 is rotatably provided on the lower main shaft 3A, and a worm wheel 5 is integrally formed on the rotating cylinder 4. The rotational force of the motor 7 is transmitted to the worm wheel 5 by the worm 6. The motor 7 is provided on the base 1.

  A rotating member 8 is detachably fitted to the outer periphery of the rotating cylinder 4. In the rotating member 8, an upper disc 8a, an intermediate disc 8b, and a lower disc 8c are provided in order from the top so as to be parallel to each other at a predetermined interval. Therefore, the upper disk 8a, the intermediate disk 8b, and the lower disk 8c are provided so as to rotate synchronously about the main shaft 3.

  The upper disk 8a holds a plurality of upper punch holders 9 along a circular orbit centered on the main shaft 3. The intermediate disk 8b holds a plurality of dies 10 along a circular orbit centered on the main shaft 3. The lower disk 8c holds a plurality of lower punch holders 11 along a circular orbit centered on the main shaft 3. The upper punch holder 9 and the lower punch holder 11 are provided so as to correspond to the position where the die 10 is disposed.

  An upper cam 18 is detachably attached to the lower main shaft 3 </ b> A on the upper portion of the rotating member 8. The cam follower 19 provided on the upper punch holder 9 is arranged so that the cam surface of the upper cam 18 slides. Accordingly, when the rotating member 8 and the upper disk 8a rotate, the cam follower 19 moves up and down following the undulation of the cam surface, so that the upper punch holder 9 rotates while moving up and down according to the cam surface.

  A support base 20 is fixed on the frame 2. A support shaft 23 is provided vertically on the support base 20. A support block 24 that supports the main shaft 3 is rotatably supported by the support shaft 23. The support block 24 is provided with a shaft support block 25 so that its position can be adjusted up and down. A pressure roller 26 (pressure means, upper roller) is rotatably attached by the shaft support block 25 so as to contact the upper end of the upper punch holder 9.

  The shaft support block 25 is screwed to the support block 24 and is connected to an adjustment shaft 28 having a worm wheel 27 around it. Therefore, the adjustment shaft 28 moves up and down by rotating the worm 29 engaged with the worm wheel 27 by a handle (not shown) provided outside, and as a result, the upper punch holder 9 is added by the pressure roller 26. The pressure can be adjusted.

  The frame 2 is provided with a shaft support block 30 so that the position thereof can be adjusted vertically. A pressure roller 31 (pressure means, lower roller) is rotatably attached to the shaft support block 30 so as to contact the lower end of the lower punch holder 11.

  The shaft support block 30 is screwed to a gear box 32 fixed to the base 1 side and is connected to an adjustment shaft 34 having a worm wheel 33 around it. Therefore, by rotating the worm 35 that engages with the worm wheel 33 by a handle (not shown) provided outside, the adjustment shaft 34 moves up and down, and as a result, the pressure roller 31 applies the lower punch holder 11 to the upper end. The pressure can be adjusted.

  Next, the holddown cylinder 40 (pressure maintaining means), the urging cam 41 (pressure maintaining means), and the lower cam 42 (pressure maintaining means) will be described with reference to FIGS. FIG. 2 is a plan view of the rotary press apparatus D. FIG. FIG. 3 is a diagram showing a state in which the upper punch holder 9 and the lower punch holder 11 move along the circular trajectory T of FIG.

  As shown in FIG. 2, the upper disk 8 a of the rotating member 8 attached to the main shaft 3 rotates around the main shaft 3. Accordingly, the upper disk 8a rotates about the main shaft 3 together with the intermediate disk 8b and the lower disk 8c provided integrally with the rotating member 8 in the same manner. Further, the upper punch holder 9 held by the upper disk 8a rotates and moves along a circular orbit T about the main shaft 3. On the circular orbit T, the pressure roller 26 described above is provided. A hold-down cylinder 40 is provided downstream of the pressure roller 26 in the rotational direction.

  As shown in FIG. 3, the hold-down cylinder 40 includes a cylinder portion 40a and a piston portion 40b. The piston portion 40b enters the cylinder portion 40a, and is configured to be able to advance and retract while receiving resistance by air.

  An urging cam 41 is attached to the piston portion 40b. The urging cam 41 is formed with a horizontal surface 41a and an inclined surface 41b. The horizontal surface 41a and the inclined surface 41b are formed continuously so that the cam follower 19 described above moves along.

  The lower cam 42 is disposed downstream from the pressure roller 31 and has an inclined surface 42a and a horizontal surface 42b. The inclined surface 42a and the horizontal surface 42b are formed continuously so that the above-described lower punch holder 11 moves along.

  In the position of FIG. 3A, the upper punch holder 9 and the lower punch holder 11 are located between the pressure roller 26 and the pressure roller 31. Therefore, the powder material in the die 10 is compressed by the upper punch 9a attached to the upper punch holder 9 and the lower punch 11a attached to the lower punch holder 11 to produce a powder molded product W.

  Subsequently, when the upper punch holder 9 and the lower punch holder 11 move along the circular trajectory T, the position reaches the position (b) of FIG. From (a) to (b) of FIG. 3, the lower punch holder 11 rises along the inclined surface 42 a of the lower cam 42. 3B, the cam follower 19 of the upper punch holder 9 contacts the horizontal surface 41a of the biasing cam 41.

  Subsequently, when the upper punch holder 9 and the lower punch holder 11 move along the circular orbit T, the position reaches the position (c) of FIG. From (b) to (c) of FIG. 3, the lower punch holder 11 further moves up along the inclined surface 42 a of the lower cam 42. As the lower punch holder 11 is raised, the upper punch holder 9 and the cam follower 19 also receive upward force to push up the biasing cam 41.

  When the urging cam 41 is pushed up, a resistance force from the hold-down cylinder 40 is received. Therefore, from (b) to (c) in FIG. 3, the powder molded product W rises in the die 10 while receiving a certain pressure from the vertical direction. In FIG. 3C, the powder molded product W is discharged out of the die 10.

  Subsequently, when the upper punch holder 9 and the lower punch holder 11 move along the circular trajectory T, the position reaches the position (d) of FIG. From (c) to (d) of FIG. 3, the lower punch holder 11 moves horizontally along the horizontal surface 42 b of the lower cam 42. On the other hand, the cam follower 19 is in a position facing the inclined surface 41b of the biasing cam 41 and abuts on the adjusting cam 50 having an inclined surface 50a facing the inclined surface 41b.

  When the upper punch holder 9 and the lower punch holder 11 further move along the circular trajectory T, the cam follower 19 rises along the inclined surface 50a of the adjustment cam 50 and eventually moves horizontally along the horizontal plane 50b.

  The adjustment cam 50 is configured to be movable along the circular trajectory T, and the rising timing of the cam follower 19 can be adjusted by moving the adjustment cam 50.

  According to the above-described embodiment, since the powder material is pressed to form the powder molded product W, the upper punch holder 9 is urged toward the die 10 while the lower punch holder 11 is raised, so that the powder molding is performed. The powder molded product W can be discharged from the die 10 without suddenly releasing the pressure applied to the product W. Therefore, it is possible to suppress cracks from entering the powder molded product W.

  In this embodiment, an air cylinder is used as the hold-down cylinder 40. However, a hydraulic cylinder may be used, or a device in which the piston portion 40b is biased by a spring may be used.

It is sectional drawing of the roller press apparatus which is this embodiment. It is a top view of the roller press apparatus of FIG. It is a figure which shows the operation state of an upper punch and a lower punch.

Explanation of symbols

  8 ... Rotating member, 8a ... Upper disc, 8b ... Intermediate disc, 8c ... Lower disc, 9 ... Upper punch holder, 9a ... Upper punch, 10 ... Die, 11 ... Lower punch holder, 11a ... Lower punch, 19 ... cam follower, 26 ... pressure roller, 31 ... pressure roller, 40 ... hold-down cylinder, 40a ... cylinder part, 40b ... piston part, 41 ... biasing cam, 41a ... horizontal plane, 41b ... inclined surface, 42 ... lower cam 42a ... inclined surface, 42b ... horizontal surface, 50 ... adjusting cam, 50a ... inclined surface, 50b ... horizontal surface, W ... powder molded product.

Claims (5)

An upper disc, an intermediate disc, and a lower disc, which are sequentially provided at predetermined intervals so as to rotate synchronously about the main shaft;
The intermediate disc is held by a die provided at a predetermined interval along a circular orbit centered on the main axis, and an upper punch holder provided at a position corresponding to the die of the upper disc. An upper punch inserted into the die, and a lower punch held in a lower punch holder provided at a position corresponding to the die of the lower disc, and inserted into the die,
A rotary press device for producing a powder molded product by compressing a powder material with the upper punch, the die, and the lower punch,
Comprising pressurizing means and pressurizing and maintaining means arranged in order along the circular orbit,
The pressurizing means includes the upper punch into the die and pressurizes the powder material to form the powder molded product,
The pressurizing and maintaining means biases the upper punch holder toward the die while raising the lower punch holder after the pressurizing means pressurizes the powder material into the powder molded product. A rotary press device for discharging the powder molded product from the die.   The pressing means has an upper roller disposed on the opposite side of the die with the upper punch holder interposed therebetween, and a lower roller disposed on the opposite side of the die with the lower punch holder interposed therebetween, The rotary press apparatus according to claim 1.   The pressure maintaining means includes a biasing cam disposed on the opposite side of the die across the upper punch holder, a lower cam disposed on the opposite side of the die across the lower punch holder, The rotary press device according to claim 1, further comprising a hold-down cylinder that urges the urging cam toward the upper punch holder.   The rotary press apparatus according to claim 3, wherein the hold-down cylinder is an air cylinder. An adjustment cam for raising the upper punch holder after the pressurizing means along the circular orbit,
5. The rotary press device according to claim 1, wherein the adjustment cam has an inclined surface along the circular orbit and is arranged so as to advance and retreat along the circular orbit.

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