JP2009082940A - Rotary press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary press capable of preventing flaws in a molding chamber and breakage of a die. <P>SOLUTION: A rotary press 1 is provided with: a plurality of molding chambers 3 annularly arranged; a plurality of upper punches 5 annularly arranged, which intrude into and retreat from the molding chambers; a plurality of upper punch holders 7 annularly arranged, which make the upper punches descend; and a rotary body 9 rotatably arranged, which supports the plurality of upper punch holders in a manner that each of upper punch holders is vertically movable. There are set, between the rotary body and each of the plurality of upper punch holders, twist-preventing keys extending along the vertical moving direction of the upper punch holders. Each of twist-preventing keys is arranged, in a plane view, at a position making an angle of 30-60° from the front side part in the tangential advancing direction of the circular orbit of the upper punch holder toward the outside of the circular orbit. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotary press apparatus.

  The rotary press apparatus is an apparatus that efficiently performs compression molding, that is, an apparatus that simultaneously performs material supply, compression molding, compact discharge, etc., on a plurality of molding chambers arranged in an annular shape. As an example, there is a rotary press device disclosed in Patent Document 1.

  In general, in a rotary press apparatus, a plurality of upper punches are annularly arranged above a plurality of molding chambers arranged in an annular shape, and an upper punch that drives the upper punch corresponding to the upper punches is arranged above the upper punch. The holders are also arranged in an annular shape. The forming chamber, the upper punch, and the upper punch holder travel in a circular path so as to be revolved at the same angular velocity while maintaining a corresponding relationship. A cam surface and a pressure roller are arranged on the circular track of the upper punch holder, and each upper punch holder has a rotation route by direct or indirect interference with the cam surface or the pressure rotor. As it progresses, it is lowered so that the corresponding upper punch is also lowered and compresses the molding chamber.

By the way, according to the research of the present inventor, in such an existing rotary press apparatus, when the upper punch is inserted into the molding chamber, the mold wall defining the molding chamber is damaged or the upper punch is It has been found that the mold may be damaged due to contact with the mold.
JP 2006-150407 A

  The present invention has been made in view of such problems, and an object of the present invention is to provide a rotary press apparatus that can prevent scratches in the molding chamber and damage to the mold.

  In order to solve the above-described problems, a rotary press device according to the present invention includes a plurality of molding chambers arranged in an annular shape, a plurality of upper punches arranged in an annular shape and moved into and out of the molding chambers, A plurality of upper punch holders arranged in an annular shape for lowering the upper punch; and a rotating body that is rotatably provided and supports the plurality of upper punch holders so as to be movable up and down. Between each of the upper punch holders, there is provided a twist prevention key extending along the ascending / descending direction of the upper punch holder, and the twist prevention key is a circle of the upper punch holder in plan view. It is arranged at an angular position of 30 degrees to 60 degrees from the front portion in the traveling direction of the tangent line of the track toward the outside of the circular track.

  A first key, a second key, and a third key are provided between the rotating body and each of the plurality of upper punch holders, and the first key, the second key, and the third key are mutually connected. The first key is the torsion prevention key spaced apart at an angular interval of 120 degrees, and in plan view, from the front side in the traveling direction of the tangent to the circular orbit of the upper punch holder, The second key is arranged on a radial line passing through the center of rotation of the rotating body and the axis of the upper punch holder in a plan view. The third key may be arranged in a line symmetrical position with the first key with the radial line as a reference line.

According to the present invention described above, scratches in the molding chamber and damage to the mold can be prevented.
The other features of the present invention and the operational effects thereof will be described in more detail with reference to the accompanying drawings.

  Embodiments of a rotary press device according to the present invention will be described below with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

  FIG. 1 is a diagram schematically showing the configuration of the rotary press device according to the present embodiment. The rotary press device 1 includes at least a plurality of molding chambers 3, a plurality of upper punches 5, a plurality of upper punch holders 7, and a rotating body 9. However, priority is given to the clarity of illustration, and FIG. 1 shows only the molding chamber 3, the upper punch 5, the upper punch holder 7 and the like located at both counter electrodes.

  The plurality of molding chambers 3 are arranged in an annular shape around the rotation center line CL and spaced apart from each other at substantially equal angles. Each molding chamber 3 is an open space at the top, and is defined by a die (die) 11 and a lower punch 13. More specifically, the side surface of the molding chamber 3 is defined by the die 11, and the bottom surface of the molding chamber 3 is defined by the tip of the lower punch 13.

  The plurality of upper punches 5 are disposed above the corresponding molding chambers 3, and are arranged in an annular manner with the rotation center line CL as the center and spaced apart from each other at substantially the same angle as the molding chambers 3. Yes. Each upper punch 5 is supported so as to be movable up and down so as to enter and leave the corresponding molding chamber 3.

  The plurality of upper punch holders 7 are disposed above the corresponding upper punch 5 and, like the molding chamber 3 and the upper punch 5, are annularly centered on the rotation center line CL and separated from each other at substantially equal angles. Are arranged as follows. Each of the upper punch holders 7 is provided so as to be in contact with the upper surface of the corresponding upper punch 5.

  The rotating body will be described with reference to FIG. FIG. 2 is a perspective view showing the vicinity of the upper surface of the rotating body. 1 and 2, the rotating body 9 is provided so as to be rotatable about a rotation center line CL. Further, the rotating body 9 supports a plurality of upper punch holders 7 so that they can be moved up and down independently.

  Further, the rotary press device 1 is provided with a pressure roller 15, a cam surface 17, and a cam follower 19 as a mechanism for moving the upper punch holder 7 up and down.

  The pressure roller 15 is positioned above the upper punch holder 7 at a specific position, and is not shown in detail so as to be always at a fixed position with respect to the rotating upper punch holder 7 and the rotating body 9. It is provided on the frame of the rotary press device. The pressure roller 15 has a rotation axis RA in the lateral direction, and the circumferential surface of the roller is in contact with the upper end surface of the corresponding upper punch holder 7. As described above, since the pressure roller 15 is in a fixed position and the plurality of upper punch holders 7 circulate around the circular track, the upper punch holder 7 that is sequentially below the pressure roller 15 And proceed to dive under the pressure roller 15 while descending. In FIG. 2, in order to clearly show the vicinity of the contact portion between the pressure roller and the upper punch holder, one upper punch holder is shown in a state of being extracted from the rotating body.

  Similar to the pressure roller 15, the cam surface 17 is provided independently of the rotating body 9 and the like so as to be always at a fixed position with respect to the rotating upper punch holder 7 and the rotating body 9 and the like. The cam follower 19 is provided in each of the upper punch holders 7 and engages with the cam surface 17 when the upper punch holder 7 reaches the installation position of the cam surface 17. Due to the engagement of the cam surface 17 and the cam follower 19, the upper punch holder 7 is lowered or raised as guided by the downward or upward inclination of the cam surface 17.

  FIG. 3 is a perspective view showing the vicinity of one upper punch holder. FIG. 4 is a plan view showing the positional relationship between the upper punch holder and the key. A first key, a second key, and a third key are provided between the rotating body 9 and each upper punch holder 7 and extend along the ascending / descending direction of the upper punch holder 7.

  The first key is a twist prevention key 21a. The twist preventing key 21a is arranged at an angular position of 30 degrees from the front side in the traveling direction of the tangent T of the circular orbit P of the upper punch holder 7 to the outside of the circular orbit in a plan view. The second key 21 b is arranged on a radial line R passing through the rotation center line CL of the rotating body 9 and the axis of the upper punch holder 7 in plan view. The third key 21c is arranged in a line symmetrical position with the first key with the radial line R as a reference line. From another viewpoint, the first key, the second key, and the third key are separated from each other by an angular interval of 120 degrees.

  Next, the operation of the rotary press device according to the present embodiment having the above-described configuration will be described. Based on FIG. 5, the compression molding process regarding one molding chamber is demonstrated. First, as shown in FIG. 5A, the lower punch 13 is sufficiently lowered with respect to the die 11, and the molding chamber 3 is defined by the die 11 and the lower punch 13. In this state, as shown in FIG. 5B, the molding chamber 3 is filled with a powder raw material 23 containing, for example, a metal powder or a ceramic powder by a feeder that may be in a well-known manner (not shown).

  Next, as shown in FIG. 5C, the upper punch 5 is lowered and the lower punch 13 is raised with respect to the die 11. The lowering of the upper punch 5 is performed through the lowering of the upper punch holder 7 as described above. Eventually, when the upper punch holder 7 is lowered so as to dive below the pressure roller 15, the upper punch 5 applies the necessary pressure to the molding chamber 3 via the upper punch holder 7. Is called. Thereby, a molded body 25 is formed in the molding chamber 3.

  When the pressurization is completed, as shown in FIG. 5D, the upper punch 5 is raised and the lower punch 13 is also raised. Thereby, the molded body 25 is pushed up by the lower punch 13 and exposed from the die 11, and the molded body 25 is taken out.

  In the rotary press apparatus 1, such a compression molding process is performed with respect to one molding chamber. In a plurality of molding chambers, processes shifted sequentially in accordance with the positions of the corresponding circular orbits at that time proceed simultaneously. ing.

  By the way, in the experience of the present inventor, in the existing rotary press apparatus, when the upper punch is inserted into the molding chamber, the die wall defining the molding chamber is damaged or the upper punch hits the mold. In some cases, the contact die could be damaged. Therefore, when the present inventor has intensively studied, since the upper punch holder is subjected to pressure by the pressure roller while proceeding on the circular path, the upper punch holder is twisted, and finally the upper punch is slightly It was found that it was due to descending while leaning on.

  In the present invention, the twist prevention key 21a is disposed between the rotating body 9 and each upper punch holder 7 at an angular position of 30 degrees under the above-described conditions. Is suppressed.

  The following table shows the relationship between the arrangement angle position of the twist prevention key and the occurrence of defects, obtained by experiment. Only the twist prevention key was arranged between the rotating body and each upper punch holder, and data was obtained after forming 1 million molded bodies for each configuration having different arrangement angle positions.

○：１００万個分の成形後も不具合なし
△：１００万個分の成形後、金型に傷発生
×：１００万個分の成形前に、金型破損

○: No problem even after forming 1 million pieces. Δ: Scratches occurred in the mold after forming 1 million pieces. ×: Die breakage before forming 1 million pieces.

  As can be seen from the above results, in the configuration in which the twist prevention key is provided at 180 degrees and 330 degrees, the desired effect is not obtained, and the mold is damaged and 1 million molded articles are formed. I couldn't even do it. Next, in the configuration in which the twist prevention key is provided at 0 degrees and 90 degrees, although 1 million molded bodies could be formed, scratches were observed in the mold, and the twist prevention key was expected. It turns out that the effect of is not enough. On the other hand, in the configuration in which the twist prevention keys were provided at 30 degrees, 45 degrees, and 60 degrees, there were no particular problems even after forming 1 million molded bodies. Therefore, it can be seen that the desired effect of the twist prevention key is sufficiently obtained.

  As described above, the present invention having a twist prevention key at an angular position of 30 degrees to 60 degrees under the above-described conditions, as an example of this embodiment having a twist prevention key at an angular position of 30 degrees. According to such a rotary press device, the upper punch holder can be prevented from being twisted, and scratches in the molding chamber and damage to the mold can be prevented.

  Although the contents of the present invention have been specifically described with reference to the preferred embodiments, various modifications can be made by those skilled in the art based on the basic technical idea and teachings of the present invention. It is self-explanatory.

  First, the structure of a metal mold | die is not limited to said embodiment. Therefore, a configuration in which the lower punch is fixed and the die moves may be used, a configuration in which both the lower punch and the die move, or a configuration in which both are fixed may be used. In short, as long as the molding chamber is pressurized by the lowering of the upper punch, and the upper punch and the upper punch holder are advanced in a circular path and pressurized by the pressure roller, the present invention is widely used in such a mode. Can be applied to.

  The raw material of the molded body is not limited to a strict powder form, and may be a slurry form. Specific examples of the molded body include a core of a coil device.

It is a figure which shows typically the structure of the rotary press apparatus which concerns on embodiment of this invention. It is a perspective view which shows the vicinity of the upper surface of a rotary body. It is a perspective view which shows one upper punch holder vicinity. It is a figure which shows the arrangement | positioning relationship of an upper punch holder and a key planarly. A compression molding process related to one molding chamber will be described.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotary press apparatus 3 Molding chamber 5 Upper punch 7 Upper punch holder 9 Rotating body 21a Twist prevention key (1st key)
21b 2nd key 21c 3rd key

Claims (2)

A plurality of molding chambers arranged in a ring; and
A plurality of upper punches arranged in an annular shape and entering and exiting the molding chamber;
A plurality of upper punch holders arranged in an annular shape to lower the upper punch;
A rotating body that is rotatably provided and supports the plurality of upper punch holders so as to be movable up and down,
Between the rotating body and each of the plurality of upper punch holders, a twisting prevention key extending along the ascending / descending direction of the upper punch holder is provided,
The torsion prevention key is arranged at an angular position of 30 to 60 degrees from the front side in the traveling direction of the tangent line of the circular orbit of the upper punch holder to the outside of the circular orbit in plan view. . A first key, a second key, and a third key are provided between the rotating body and each of the plurality of upper punch holders,
The first key, the second key, and the third key are separated from each other by an angular interval of 120 degrees,
The first key is a key for preventing torsion, and is arranged at an angular position of 30 degrees from the front side in the traveling direction of the tangent to the circular orbit of the upper punch holder toward the outside of the circular orbit in plan view. And
The second key is arranged on a radial line passing through the rotation center of the rotating body and the axis of the upper punch holder in a plan view,
2. The rotary press device according to claim 1, wherein the third key is arranged in a line symmetrical position with the first key with the radial line as a reference line.

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