JPH0244958Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a rotary press device used for molding tablets or metal pieces, etc., and particularly relates to a lower punch for a rotary press device with improved durability.

[Prior art]

3 to 5 are a cross-sectional view showing the structure of a half part of the rotary press device, a cross-sectional view taken along the line AA, and a cross-sectional view taken along the line B-B in FIG. 3, respectively. In these figures, the rotating body 1 includes a disk-shaped workbench 1a.
is provided, and 12 to 25 mortar parts 2 are embedded in this workbench 1a at equal intervals on the same circumference.
A mortar hole 2a passing through the workbench 1a is formed in the center of this mortar part 2, and a lower pestle 3 is inserted into this mortar hole 2a.
The upper end portion 3a of is supported so as to be movable up and down. On the other hand, an upper punch 4 is provided above each mortar part 2 so as to be able to move up and down, and when the rotating body 1 rotates around the axis
rotates while maintaining the positional relationship that they are arranged in one row in the vertical direction. In this case, the lower end 3b of the lower punch 3
moves along an annular guide track 6 provided on the base 5. This guide track 6 has a convex portion 6a with a gentle slope, and when the lower punch 3 climbs this convex portion 6a, the lower pestle 3 rises, while when descending this convex portion 6a, The lower end 3b of the lower punch 3 is fitted into a groove 6d formed in the convex part 6a of the guide track 6, and the lower punch 3 is fitted into a groove 6d formed in the convex part 6a of the guide track 6, and the lower punch 3 A round neck 3c (see Fig. 6) formed at the lower end 3b of the die is supported in the radial direction (see Fig. 7) and descends. Then, the lower punch 3 moves up and down once or multiple times. Furthermore, when the lower punch 3 is located at the highest point of the convex portion 6a, its upper end coincides with the upper surface of the mortar portion 2, while when the lower punch 3 passes through other parts, its upper end is It is sunk in the mortar hole 2a. When the upper end is sunk into the mortar hole 2a in this way, the powder material is filled into the mortar hole 2a, and the lower punch 3 and the upper punch 4 are pressed by a press roll (not shown). The material is compressed and molded within the mortar hole 2a by being pressed upward and downward, respectively. Then, when the lower punch 3 rides on the convex portion 6a and rises to lift the object to be molded, the object to be molded is taken out.

In this way, the raw material is continuously molded in each of the mortar parts 2, 2, . . . .

[Problem that the invention attempts to solve]

By the way, various forces act on the lower punch 3 mentioned above, such as the load during compression and the force from the ridges. In particular, during compression by press rolls, a strong vertical compression force is applied to the lower punch 3, and this compressive force causes the lower punch 3 to be supported by the rotating body 1 and strongly pressed onto the guide track 6. As the lower punch 3 revolves, an extremely large bending moment acts on the lower end 3b of the lower punch 3 in the tangential direction of the guide track 6. For this reason, the lower punch 3 may break at the round neck 3c where the strength is the weakest, resulting in poor durability.

In view of the above-mentioned circumstances, the object of this invention is to provide a lower punch for a rotary press device, which has increased strength at the engagement portion with the protruding strip, is less likely to break, and has improved durability.

[Means for Solving the Problems] In order to achieve the above object, this device moves on a circular guide track, and when climbing up a convex part with a gentle slope provided on the guide track, the device moves upward. When descending the convex portion, the lower end portion is fitted into a groove provided in the convex portion, and the lower end portion is supported in the radial direction by two opposing protrusions provided in the groove. In the lower punch for a rotary press that moves up and down by lowering the punch, a notch is formed in the circumferential surface of the lower end portion to engage with the ridge.

[Effect]

Regarding the lower punch of the rotary press device of the present invention,
In particular, during compression by press rolls, the compression force applied in the vertical direction and the movement of the lower end on the guide track combine to cause bending in the tangential direction of the guide track applied to the lower end. Moment can be sufficiently resisted by the lower end portion having a notch that engages with both protrusions of the groove of the guide track, and the small diameter round neck portion is provided as in the conventional method. Compared to other cases, the strength will not be insufficient, breakage can be prevented, and durability can be improved.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings.

1A and 1B are a front view and a bottom view, respectively, showing the shape of a lower punch for a rotary press device according to an embodiment of this invention. In this figure, the lower pestle 10 is
It has a cylindrical main body 10a, and this main body 10
A shoulder portion 10c whose diameter becomes smaller toward the top is provided at the upper end 10b of the main body 10a, and a cylindrical action portion 10d whose diameter is smaller than that of the main body 10a is provided on this shoulder portion 10c. In this case, the action part 10
d and the axis of the main body 10a coincide. On the other hand, main body 1
Horizontal notches 11 and 12 are provided on the circumferential surface of the lower end portion 10e of 0a at a predetermined height from the bottom surface 10f.
It is formed through the axis. These notches 1
1 and 12 have the same shape, and their arcuate walls 11a, 11a and 12a, 12a both have an inclination such that the distance between them narrows toward the bottoms 11b, 12b. Also, its bottom 1
1b and 12b form vertical surfaces, while forming a convex shape with a slightly smaller curvature in the longitudinal direction (left-right direction in FIG. As a result, both notches 11 and 12
The thickness of the part sandwiched between the two notches 11,
The thickness in the direction perpendicular to the direction connecting the intermediate points of 12 (the Y-Y direction in FIG. The distance is slightly smaller than that of .
Further, the vertical width l of the bottom portions 11b and 12b is
The thickness is slightly larger than the thickness l ₁ (Fig. 2) of the tips of the protrusions 6b and 6c. And the lower pestle 10 like this
When the notches 11 and 12 engage with the protrusions 6b and 6c, they are rendered immovable in the vertical direction and radial direction, and unrotatable about the axis.
In this case, as a result of the lower punch 10 having the above-described shape, the strength in the compression direction in the portion where the protrusions 6b and 6c engage is significantly increased compared to the conventional lower punch 3.

In the above configuration, the lower punch 10 revolves along this guide track. In this case, notches 11 and 12
Since the bottom portions 11b, 12b of the
The area in contact with the tip of the is extremely small, and the friction of movement is small. In addition, in the notches 11 and 12, the compressive strength in the vertical direction and the strength against bending moment in the tangential direction of the guide track are significantly increased compared to the conventional ones, making it difficult to break. Therefore, in particular, during compression by the press rolls, the lower end 10e of the lower punch 10 can sufficiently resist the vertical compressive force applied to the lower punch 10, and the lower end 10e of the lower punch 10 moves toward the guide track 6 when the compressive force is applied.
When moving along the guide track 6 while being pressed by the lower punch 10, sufficient strength can be ensured against the bending moment in the tangential direction of the guide track 6 that is applied to the lower end 10e of the lower punch 10, Durability can be improved.

[Effect of idea]

As explained above, this invention moves on an annular guide track and rises when climbing a gently sloped convex part provided on the guide track.
When descending the convex portion, the lower end portion is fitted into a groove provided in the convex portion and is supported in the radial direction by two opposing protrusions provided in the groove. In a lower punch for a rotary press device that moves up and down as a result of this, a notch is formed on the circumferential surface of the lower end portion to engage with the protruding strip, and therefore, especially when compressed by the press roll, the punch moves in the up and down direction. The compressive force applied to the guide track and the movement of the lower end on the guide track combine to cause the groove of the guide track to bend in the tangential direction of the guide track, which is applied to the lower end. The lower end portion with a notch that engages with both protrusions can provide sufficient resistance, and the strength will not be insufficient compared to the conventional case where a small diameter round neck portion is provided. This prevents breakage and improves durability. Furthermore, by improving the durability of the lower punch, the reliability of the rotary press device is improved, and stable operation of the device becomes possible.

[Brief explanation of the drawing]

1A and 1B are a front view and a bottom view showing the shape of a lower punch according to an embodiment of the invention, respectively, FIG. 3 to 5 are cross-sectional views showing the configuration of half of the rotary press device, a cross-sectional view taken along the line A-A, a cross-sectional view taken along the line B-B in FIG. 3, and FIGS. FIG. 7 is a partial front view and a bottom view showing essential parts of a conventional lower punch, respectively, and a sectional view showing an engaged state of the lower punch and a protruding strip. 2... Mortar part, 6... Guide track, 6a... Convex part,
6b, 6c...Convex strip, 6d...Groove, 10...Lower punch, 10e...Lower end, 11, 12...Notch (notch).

Claims (1)

[Scope of utility model registration request] While moving on an annular guide track, when climbing up a convex part with a gentle slope provided on the guide track, it rises, and when going down the convex part, the lower end falls into a groove part provided in the convex part. In a lower punch for a rotary press device, in which the lower end portion is radially supported by two opposing protrusions provided in the groove and moves vertically by descending, the lower end portion circumferential surface A lower punch for a rotary press device, characterized in that a notch is formed to engage with the protrusion.