JPH0761559B2 - Pressing equipment for sizing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] a) Field of Industrial Application The present invention relates to a sizing press device for straightening (sizing) a powder molded product that has been compression molded by a powder molding press and then sintered. It is a thing.

b) Conventional Technology Many of the powder molded products of this type are of a flanged shape in particular, and an outer flange-shaped powder molded product A shown in FIG. 7 (a) and an inner flange shown in FIG. 7 (b). There is a shaped powder molded product B.

Then, when sizing the powder molded products A, B of these flanged shapes, either the flange portion A1, B1 or the boss portion A2, B2 in the extrusion mechanism of the sizing press in the extrusion (knockout) step after pressing. When is pushed up, deformation occurs due to the frictional force on the side surface.

To solve this problem, for example, Japanese Patent Publication No.
There is a No. 948 straightening press for powder metallurgy. For the details of this straightening press, refer to the same publication. Here, an outline of the main part and operation of the press machine will be described with reference to FIGS. 8 (a) to (c).

In this press machine, an outer flange-shaped powder molded product A is pressed in a die 3 attached via a die retainer 2 to a die plate 1 fixed to the press machine. On the movable lower punch plate 4, a first punch 6 for pressing the flange portion A1 with the upper punch 5 and a second punch 7 for pressing the boss portion A2 inside the first punch 6 are respectively provided. A core rod 9 which is provided and is inserted into the second punch 7 to form the inner surface of the boss portion A2 is provided on the fixed plate 8 provided in the lower punch plate 4 to configure a press mechanism. .

In addition, the bearing plate mounted on the lower punchin plate 4
10 is pivotally supported by a shaft 11 and one end thereof is the first punch 6
Lever 13 that is inserted into the punch through the window hole 12 and abuts the lower end of the second punch 7, and the base end is screwed into the lower portion of the die plate 1 and the tip end is engaged with the other end of the lever 13. Bevel gear 14 attached to the die plate 1 side
Further, there is provided an extruding mechanism for the powder molded product A by means of a pushing rod 15 whose height is adjustable by screwing an outer peripheral thread portion.

In the above-mentioned press machine, as shown in FIG. 8 (a), the upper punch 5, the first punch 6, and the second punch 7 perform sizing press of the powder molded product A, and then, first, the lower punch plate 4 is pressed.
The first punch 6 and the second punch 7 are raised at the same time by the ascending, and the flange portion A1 of the powder molded product A is first separated from the die 3 as shown in FIG. Since the height is adjusted in advance so that the tip of the pushing rod 15 comes into contact with the other end, when the lower punch plate 4 is subsequently raised, the lever 13 whose other end is pushed by the pushing rod 15 swings. One end pushes up the second punch 7, which causes the second punch 7 to rise faster than the first punch 6 and disengage the boss portion A2 as shown in FIG. 8 (c).

In this way, by deforming the extrusion timing of the flange portion A1 and the boss portion A2 of the powder molded product A, the deformation of the powder molded product A can be prevented.

Next, when the inner flange-shaped powder molded product B is sized by applying the above technical idea, FIG. 9 (a)
Means shown in (c) are adopted. In this case, only the structure of the first punch and the second punch of the press mechanism for sizing the powder molded product B is different from the above-mentioned press mechanism, and the other structure is the same. Are denoted by the same reference numerals and description thereof will be omitted.

That is, as shown in detail in FIG. 10, this press mechanism includes a first punch 16 including a connecting portion 16a on the base side and a punch portion 16b on the tip side, a connecting portion 17a on the base side and a punch portion 17b on the tip side. And a second punch 17 consisting of the second punch 17, the base side of which is connected to the connecting portion 16a of the first punch 16 on the inner peripheral side of the connecting portion 17a of the second punch 17, and the outer flange-shaped powder molded product A is pressed. As in the case of the mechanism, the punch portion 16b sizes the boss portion B2 of the powder molded product B having the inner flange shape and the punch portion 17b sizes the flange portion B1 at the tip end side. Contrary to the case of the press mechanism A, the punch section 17b is arranged on the inner peripheral side of the punch section 16b. For this reason, the first punch 16 is formed with a square-shaped window hole 16c, and the second punch 17 is formed with half-moon-shaped notch holes 17c, 17c, respectively, so that both are intertwined. Are doing

c) Problems to be Solved by the Invention However, the above-mentioned conventional techniques have a drawback that the punch structure is complicated and the strength is weak particularly when sizing the powder molded product B having an inner flange shape. Also,
In the outer flange-shaped powder molded product A and the inner flange-shaped powder molded product B of FIG. 7, each dimension a ₁
And b ₂ and the respective powder molded products A and B having the same dimensions a ₂ and b _1, there were drawbacks such that sizing could not be performed with the same press machine unless the punches were replaced.

Therefore, an object of the present invention is to provide a sizing press device that can solve the problems of these conventional techniques.

[Structure of Invention]

a) Means for Solving the Problems In order to solve the above problems, in the sizing press device of the present invention, an outer flange-shaped or inner flange-shaped flange portion is formed on the upper side, and a lower side of this flange portion is formed. A press device for sizing a powder molded product having a boss portion, which comprises an upper punch for pressing the powder molded product from above and a boss portion of the inner flange shaped powder molded product or the outer flange shaped powder molded product. Lower first punch that pressurizes from below the flange portion of, and a flange portion of the inner flange-shaped powder molded product or a boss of the outer flange-shaped powder molded product that is concentrically disposed inside the lower first punch. A lower second punch for pressurizing the lower part from below, and the lower second punch for the sizing of the powder molded product A pull-out means for pulling out the flange portion of the powder molded product by simultaneously pushing up the first punch and the lower second punch, and the lower first punch or the lower second punch for the powder molded product from which the flange portion is pulled out. Step extracting means for pushing up to extract the boss portion of the powder molded product, and the lower first punch side when the powder molded product for sizing the lower punch driven to be lifted at the time of this step extraction has an inner flange shape In the case of the outer flange shape, a mechanism for switching to the lower second punch side is provided.

b) Examples Hereinafter, the present invention will be described based on illustrated examples. First, the outline of this press machine will be described with reference to FIG. Four columns 20 (only two of which are shown in the drawing) are erected by sequentially connecting short cylinders, and a long tie rod 21 is provided in the column 20.
Is inserted and the upper end is fixed by a nut 22. A lower frame 23 is attached to a lower portion of each column 20, an intermediate frame 24 is attached to an intermediate portion thereof, and a crown 25 is attached to an upper portion thereof to connect the columns 20 to each other. A lower drive mechanism 26 is provided between the lower frame 23 and the intermediate frame 24.
However, the die set 27 and the crown 25 on the intermediate frame 24
An upper drive mechanism 28 is attached to each.

An outline of the lower drive mechanism 26 is that a lower pressurizing cylinder 29 and an extracting cylinder 30 are fixedly mounted on the lower frame 23, and an extracting plate 31 is attached to the piston side of each of these cylinders. Reference numeral 31 denotes a lower pressing rod 33 which penetrates the intermediate frame 24 and a bolster 32 fixedly mounted on the intermediate frame 24 and projects toward the die set 27 side, and a height adjustment is performed on a lower surface of the intermediate frame 24. The lower pressure cylinder is provided with a positioning rod 35 that comes into contact with the extraction adjusting mechanism 34 that is attached so as to regulate the extraction position of the extraction plate 31.
A step extracting cylinder 37 is attached to the center of the step 29 through a piston retainer 36.
A rod switching mechanism 38 that can be moved up and down by extending and contracting the step extracting cylinder 37 is attached to the tip end side of the.

Further, in the intermediate frame 24, the upper end side is capable of penetrating the intermediate frame 24 and the bolster 32 and protruding toward the die set 27 side, and the lower end side is provided with a step extracting rod 54 protruding toward the rod switching mechanism 38 side. 55 is locked so as to be vertically slidable via a locking cylinder 47 wound around the outer periphery of the intermediate portion. The die set 27 is fixedly held by the die set clamp 39 on the bolster 32 on the intermediate frame 24.

Further, the upper drive mechanism 28 includes a slide 42 which is moved up and down by an upper pressurizing cylinder 40 and a booster cylinder 41.
The upper punch plate 43 attached to the slide 42 has an upper punch 46 attached thereto via an upper punch receiving plate 44 and an upper punch retainer 45, as will be described later.

Next, details of the rod switching mechanism 38, which constitutes a part of the lower drive mechanism 26 and is a main part of the present invention, will be described with reference to FIGS. The rod switching mechanism 38 is provided with a step extracting plate 50 fixed to the piston of the step extracting cylinder 37, and rotatably mounted on the step extracting plate 50, and a flange switching gear 51 is attached to the outer periphery on the upper side. Further, the gear mounting cylinder 52 and the flange switching plate 53 having a diamond-shaped plane whose bottom surface is fixed to the gear mounting cylinder 52 are provided.

Around the shaft center of the flange switching plate 53, an intermediate shaft portion is slidably supported by the intermediate frame 24, and a tip end portion is protruded toward the die set 27 side. 54 and 55 are the flange switching plates 5
It is installed vertically at a position where the distance from the axis of 3 is equal. These step extracting rods 54, 55 are two step extracting rods 5 as shown in FIG. 4B when the inner flange-shaped powder molded product B is sized.
4, 54 are placed in contact with the upper surface of the flange switching plate 53 at a diagonal position on the long side, and the remaining two step extracting rods 55, 55 are diagonal positions on the short side of the flange switching plate 53. It is separated from the flange switching plate 53 on the outside of the. Further, when sizing the outer flange-shaped powder molded product A, as shown in FIG. 4 (a), the two step extraction rods 55, 55 are the upper surfaces of the flange switching plate 53 at diagonal positions on the long side. The remaining two step extracting rods 54, 54 are placed in contact with the flange switching plate 53 outside the diagonal position of the flange switching plate 53 on the short side.

The rod switching is performed by rotating the flange switching plate 53 by 90 °. The rod switching mechanism 38 is provided on the motor-equipped speed reducer 56 fixed at the proper position of the extraction plate 31, and the motor-equipped speed reducer 56. The attached sprocket 57, the chain 58 whose one end is suspended on the sprocket 57, the sprocket 59 whose other end is suspended on the chain 58, and the flange switching gear 51 which rotates integrally with the sprocket 59. It is configured with a drive gear 60 that meshes.

Further, in the gear mounting cylinder 52 to which the flange switching gear 51 and the flange switching plate 53 are attached, the step extraction plate 50 on which the gear mounting cylinder 52 is mounted is placed.
A center shaft 61 formed with an engaging step 61a that is rotatably held above is inserted, and the center shaft 61 is screwed to the step extracting plate 50. Also, the gear mounting cylinder 52
A step adjusting screw tube 62 is loosely fitted on the outer periphery of the step adjusting screw tube 62, and a screw 62a is engraved on the outer periphery of the step adjusting screw tube 62. The formed adjusting screw 67 is attached to the extraction plate 31. A worm wheel 64 that meshes with the screw 62a fixed to the key 63 is engaged with the outer circumference of the step adjusting screw cylinder 62 above the adjusting screw 67, and the worm wheel 64 is rotated by the meshing worm 65 to move the worm wheel 64. The level difference adjusting screw cylinder 62 is moved in the height direction, whereby fine adjustment in the height direction of the entire rod switching structure 38 can be performed.

In addition, reference numeral 66 is provided so as to project from the piston retainer 36 into the step extracting plate 50, and the step extracting plate 50.
A stopper pin for stopping the rotation of the worm wheel, reference numeral 68 is a lid member attached above the worm wheel 64 and the worm 65,
69 is a sensor for height position detection.

Next, the structure of the die set 27 will be described with reference to FIG. 5 together with the operation for sizing the inner flange-shaped powder molded product B. A base plate 70 fixedly mounted on the bolster 32 is provided at the lowermost stage of the die set 27. The base plate 70 has a lower pressing rod 33 protruding from the lower drive mechanism 26 side and each step extracting rod. 54
Alternatively, through holes through which 55 is inserted from below are formed respectively, and a core rod holder 71 is inserted through a central screw hole of the base plate 70 through an adjusting screw 72 so that the height of the core rod holder 71 can be adjusted.

On the base plate 70, a lower pressure plate 75 having a lower first punch pressure block 73 protruding from the upper surface side and a pressure receiving block 74 protruding from the lower surface side is placed. The pressure receiving block 74 of the lower pressurizing plate 75 corresponds to the base plate 70.
When the lower pressure plate 75 is fitted into the through hole and is pressed by the lower pressure rod 33, the lower pressure plate 75 is moved upward so as to be separated from the base plate 70.

At the center of the lower pressure plate 75, a second lower punch holder 77 of a cylindrical body, into which the core rod holder 71 penetrating the base plate 70 and the lower pressure plate 75 is inserted, is placed. The second punch holder 77 has a lower second extraction rod 76 provided vertically. This lower second extraction rod
76 is urged downward by a descending spring 76a which is fitted into the through hole into which the step extracting rod 55 is inserted from above and is wound around the outer periphery of the lower second extracting rod 76 on the base side. . In this case, the step extracting rod 55
Is in the state of FIG. 4 (b) which is not raised by the switching of the rod switching mechanism 38.

Above the lower pressurizing plate 75, a disc-shaped insertable lower second punch holder 77 is brought into contact with the lower first punch pressurizing block 73 of the lower pressurizing plate 75 to move up and down. A punch plate 78 is provided. A lower first punch extracting rod 79 is vertically provided on the lower surface of the lower first punch plate 78, and the lower first punch extracting rod 79 is fitted from above into a through hole into which the step extracting rod 54 is inserted. The locking flange 79a, which is moved upward by the pressing of the step extracting rod 54, is lowered when the pressing is released, and is projected on the outer periphery of the intermediate portion of the lower first extracting rod 79. It is locked by a recessed portion 75a formed in the upper surface of the pressure plate 75.

On the lower second punch holder 77, a lower second punch receiving plate 82, through which a core rod 81 attached to the core rod holder 71 via a core rod retainer 80 penetrates, is formed on the lower first punch holder 77.
The punch plate 78 is provided so as to be inserted into a through hole formed in the center of the punch plate 78. Further, a lower second punch 84 is attached to the lower second punch receiving plate 82 via a lower second punch presser 83, and the core rod 81 is inserted into the axial center of the lower second punch 84. . The lower second punch 84 presses the flange portion B1 for the powder molded product B having the inner flange shape in cooperation with the upper punch 46, but the powder molded product A having the outer flange shape is sized. In this case, as shown in FIG. 6, the boss portion A2 of the powder molded product A is pressed in cooperation with the upper punch 46.

A lower first punch receiving plate 85 is placed on a central upper portion of the lower first punch plate 78, and a lower first punch 87 is placed on the lower first punch receiving plate 85 via a lower first punch retainer 86. Is attached,
The lower second punch 84 is inserted into the lower first punch 87. The lower first punch 87 presses the boss portion B2 in cooperation with the upper punch 46 when sizing the inner flange-shaped powder molded product B, but sizes the outer flange-shaped powder molded product A. In this case, as shown in FIG. 6, the flange portion A1 of the powder molded product A is placed on the upper punch 46.
Pressurize in cooperation with.

A die plate 88 fixed to the main body of the press is disposed above the lower first punch plate 78, and the die plate 88 is vertically installed so that the lower first punch plate 78 and the lower pressure plate 75 are provided. It is integrally connected to the base plate 70 via a connecting rod 89 penetrating through. A die 91 is attached to the center of the die plate 88 via a die retainer 90, and the core rod 81, the lower first punch 87 and the lower first punch 87 are inserted into the through hole formed in the center of the die 91. Two punches 84 are respectively inserted to form a cavity suitable for the powder molded product A or B to be sized. The height of the core rod 81 is adjusted by the height adjusting screw 72 so that the tip of the core rod 81 is flush with the surface of the die 91.

Further, a guide ring 93 is attached on the die plate 88, and a base portion of a guide post 94 whose front end is locked to the upper punch plate 43 is inserted into the guide ring 93 to move the upper punch 46 up and down. I'm giving you guidance.

Next, using the above device, a powder molded product with a flanged shape
The operation of sizing and pressing A and B and then extruding (knocking out) the powder molded products A and B after pressing will be described.

First, the case of a powder molded product B having an inner flange shape will be described mainly with reference to FIG. The left half of FIG. 5 is the pressure (press) position, the right half is the extrusion (knockout) position,
The circles indicated by alternate long and short dash lines indicate the intermediate positions of extrusion. At the pressing position, the powder molded product B is pressed on the upper surface side by the upper punch 46 lowered by the extension of the upper pressing cylinder 40, and on the lower surface side, the boss portion B2 has the lower first punch 87 and the flange portion B1 has the lower first portion. The two punches 84 are in contact with each other. This lower first punch 87
Is supported by the base plate 70 via the lower first punch cradle 85, the lower first punch plate 78, the lower first punch pressure block 73, and the lower pressure plate 75, and counters the pressure from the upper punch 46. At the same time, the lower pressure rod 33 urged by the extension of the lower pressure cylinder 29 and the withdrawal cylinder 30.
Presses the lower pressure plate 75 via the pressure receiving block 74.

When the upper punch 46 is lifted by the upper pressure cylinder 40 after finishing the predetermined sizing by the pressure at the pressure position, the lower pressure plate is released from the pressure from above.
75 is lifted from above the base plate 70 by the urging force of the lower pressure rod 33 which is pressed through the pressure receiving block 74.

At the pressurizing position, both the lower pressurizing cylinder 29 and the extracting cylinder 30 operate to press the lower pressurizing plate 75. The urging force on the pressure rod 33 is provided only by the extraction cylinder 30.

When the lower pressurizing plate 75 is lifted as described above, the lower first punch 87 is lifted through the lower first punch pressurizing block 73, the lower first punch plate 78 and the lower first pan holder 85 to perform powder molding. The boss portion B2 of the product B is pushed up, and at the same time, the lower second punch 84 is lifted via the lower second punch holder 77 and the lower second punch receiving plate 82 to move the flange portion B1 of the powder molded product B to the intermediate position. Push up.

When the powder molded product B is extruded to the intermediate position, the operations of both the lower pressurizing cylinder 29 and the extracting cylinder 30 are stopped, and when the step extracting cylinder 37 is extended, the rod switching mechanism 38 is operated from below. When pressed, the flange switching plate 53 raises the step extracting rod 54 and presses the lower first punch extracting rod 79 from below. This lower first punch extraction rod 79
Is the lower first punch plate 78 and the lower first punch receiving plate 85.
And the boss B2 of the powder molded product B through the lower first punch 87.
Push up to the extrusion position.

On the other hand, when the outer flange-shaped powder molded product A is sized and the powder molded product A is extruded, the process is performed as shown in FIG. In FIG. 6, the left half is the pressurizing (pressing) position and the right half is the extruding (knockout) position.
The circles indicated by the alternate long and short dash lines respectively indicate the intermediate positions of extrusion. In this figure, at first glance, the parts of the die set 37, the lower pressing rod 33, and the step extracting rods 54, 55 are different. However, it has almost the same structure except that it shows a cross section of a portion different from that of FIG.

The difference between them is that the powder molded product A has the outer flange shape and the positions of the flange portion A1 and the boss portion A2 are opposite to those of the powder molded product B having the inner flange shape. 87 presses the flange portion A1 and the lower second punch 84 presses the boss portion A2. And, if the dimensions a ₁ and b ₂ and the dimensions a ₂ and b _{1 of the} powder molded products A and B are equal, respectively, these punches 84 and 87 can be commonly used without replacement, but in this embodiment, Since the thickness of the flange portion is thicker than the thickness of the boss portion, the shape of each punch is different so as to conform to it. Further, since the powder molded product A after sizing is extruded last by the lower second punch 84, the lower second punch extraction rod 76 side is used to raise the lower second punch 84, and the lower second punch 84 is used. Step extraction rod 55 that presses the extraction rod 76
It is necessary to operate the rod switching mechanism 38 and rotate the flange switching plate 53 by 90 ° so that is located on the flange switching plate 53 as shown in FIG. 4 (a).

Then, in the same manner as in the case of the powder molded product B, the powder molded product A that is pressed and extruded to the intermediate position has the boss portion A2 at the end by the lower second punch 84 that moves up in conjunction with the step extracting rod 55. Extruded.

〔The invention's effect〕

As is apparent from the above-described embodiments, in the present invention, the inner flange-shaped powder molded product B and the outer flange-shaped powder molded product A are both extrusion timing of the flange portion and the boss portion as in the case of the conventional example. It is possible to prevent the deformation of the powder molded article by shifting. In order to achieve this, the lower punch has a structure in which the lower first punch and the lower second punch are concentrically arranged, and when the lower punch finally extracts the step of the boss portion, the powder molded product has an inner flange shape. The lower punch for pushing up is switched to the lower first punch or the lower second punch and used depending on whether it is the outer punch or the outer flange shape.

As described above, the configuration of the lower punch for extracting the step is a combination with an extremely simple shape as compared with the above-described conventional example, and the problem of reducing the strength of the mold in the conventional example is also solved.

Further, in this press machine, both the inner flange shape and the outer flange shape can be supported by exchanging some punches according to the size and shape of the powder molded product to be sized and performing the switching operation of the switching mechanism. .

In particular, when the outer flange-shaped powder molded product A and the inner flange-shaped powder molded product B have the same dimensions a1 and b2 and dimensions a2 and b1, respectively, the punches need not be replaced and the switching mechanism can be operated in the same manner. Sizing and extraction can be done by a press machine.

[Brief description of drawings]

FIG. 1 is an overall vertical cross-sectional view showing an outline of a sizing press device according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of a main part of a lower drive mechanism of the device, and FIG. 3 is mounted in the lower drive mechanism. 4A is a partial perspective view of the rod switching mechanism, and FIG. 4A is a switching position at the time of extrusion of the outer flange-shaped powder molded product A, and FIG. 4B is a switching position at the time of extrusion of the inner flange-shaped powder molded product B. FIG. 5 is a plan view of an essential part of the rod switching mechanism, FIG. 5 is a vertical sectional view of a die set at the time of extruding an inner flange-shaped powder molded product B, and FIG. 6 is a diagram at the time of extruding an outer flange-shaped powder molded product A. FIG. 7 is a vertical cross-sectional view of the die set, FIG. 7 is a vertical cross-sectional view of the powder molded products A and B, and FIG. 8 is a vertical cross-sectional view showing the extrusion process of the outer flange-shaped powder molded product A using the conventional extrusion mechanism. , Fig. 9 is the same Longitudinal sectional view showing an extrusion process of the powder molded product B of the inner flange shape, FIG. 10 is a perspective view of the punch structure at the extrusion mechanism. [Explanation of symbols] 20 …… column, 21 …… tie rod 22 …… nut, 23 …… lower frame 24 …… intermediate frame, 25 …… crown 26 …… lower drive mechanism, 27 …… die set 28 …… upper Drive mechanism, 29 …… Lower pressure cylinder 30 …… Extraction cylinder 31 …… Extraction plate 32 …… Bolster, 33 …… Lower pressure rod 34 …… Extraction adjustment mechanism 35 …… Positioning rod, 36 …… Piston retainer 37 …… Step extracting cylinder 38 …… Rod switching mechanism 38 39 …… Die set clamp 40 …… Upper pressure cylinder 41 …… Booster cylinder 42 …… Slide, 43 …… Upper punch plate 44 …… Upper punch receiving plate, 45 …… Upper punch presser 46 …… Upper punch, 47 …… Locking cylinder 50 …… Step removal plate 51 …… Flange switching sleeve 52 …… Gear mounting tube 53 …… Flange switching plate 54,55 …… Step removal Rod 56 …… Reducer with motor, 57,59 …… Sprocket 58 …… Chain, 60 …… Drive gear 61 …… Center shaft, 62 …… Step adjustment screw cylinder 63 …… Key, 64 …… Warm wheel 65 …… Worm, 66 …… Stopping pin 67 …… Adjustment screw, 68 …… Lid member 69 …… Sensor, 70 …… Base plate 71 …… Core rod holder 72 …… Adjustment screw 73 …… Lower first punch press block 74 ...... Pressure receiving block, 75 ...... Lower pressure plate 76 ...... Lower second extraction rod 77 ...... Lower second punch holder 78 ...... Lower first punch plate 79 ...... Lower first punch extraction rod 80 …… Core rod retainer , 81 ...... Core rod 82 ...... Lower second punch support plate 83 ...... Lower second punch retainer 84 ...... Lower second punch 85 ...... Lower first punch retainer plate 86 ...... Lower first punch retainer 87 ...... Lower 1st punch, 88 …… die plate 89 …… connecting rod, 90 …… A Presser 91 …… Die, 93 …… Guide ring 94 …… Guide post A …… Outer flange-shaped powder molded product B …… Inner flange-shaped powder molded product A1, B1 …… Flange part A2, B2 …… Boss Department

Claims (1)

[Claims] 1. A press device for sizing a powder molded product, wherein an outer flange-shaped or inner flange-shaped flange portion is formed on the upper side, and a boss portion is formed on the lower side of this flange portion. An upper punch that presses from above, a lower first punch that presses the boss portion of the inner flange-shaped powder molded article or the flange portion of the outer flange-shaped powder molded article from below,
A lower second punch that is arranged concentrically inside the lower first punch and presses the flange portion of the inner flange-shaped powder molded article or the boss portion of the outer flange-shaped powder molded article from below. In this pressing device, the lower first punch and the lower second punch are simultaneously pushed up with respect to the powder molded product after sizing to extract the flange portion of the powder molded product, and the flange portion is extracted. For the powder molded product, the lower first punch or the lower second punch
A step extracting means for pushing up the punch to extract the boss portion of the powder molded product, and the lower first punch when the powder molded product for sizing the lower punch driven to be lifted at the time of extracting the step has an inner flange shape. Side, and in the case of an outer flange shape, a switching mechanism for switching to the lower second punch side is provided.